[linux-yocto] [PATCH 1/2] valleyisland-io: add patch for Baytrail SPI support
Chang, Rebecca Swee Fun
rebecca.swee.fun.chang at intel.com
Mon Dec 9 22:10:07 PST 2013
Hi Bruce,
Regarding the issue to pointed out, it came from Kernel version 3.10. See following:
author Kees Cook <keescook at chromium.org> 2013-01-17 02:53:55 (GMT)
committer Greg Kroah-Hartman <gregkh at linuxfoundation.org> 2013-01-21 22:52:45 (GMT)
commit 6d1f56aa5149082bb0ce6dd8d47e51a1013a206d (patch)
tree 25fb9f459880f31e893d6938e937ad41c952ca75
parent 2a570a4917cca818bc69d0789483e0a9ace79477 (diff)
drivers/spi: remove depends on CONFIG_EXPERIMENTAL
The CONFIG_EXPERIMENTAL config item has not carried much meaning for a
while now and is almost always enabled by default. As agreed during the
Linux kernel summit, remove it from any "depends on" lines in Kconfigs.
CC: Grant Likely <grant.likely at secretlab.ca>
Signed-off-by: Kees Cook <keescook at chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
Can we proceed by pulling in all the pull requests that I submitted? Or do I need to
resubmit this specific pull request by segregate this piece of code out?
Thanks.
Rebecca
> -----Original Message-----
> From: Bruce Ashfield [mailto:bruce.ashfield at windriver.com]
> Sent: 09 December, 2013 10:27 PM
> To: Chang, Rebecca Swee Fun; linux-yocto at yoctoproject.org; Darren Hart
> Subject: Re: [linux-yocto] [PATCH 1/2] valleyisland-io: add patch for Baytrail
> SPI support
>
> On 13-12-09 05:08 AM, rebecca.swee.fun.chang at intel.com wrote:
> > From: "Chang, Rebecca Swee Fun" <rebecca.swee.fun.chang at intel.com>
> >
> > spi-pxa2xx: Baytrail has 1 SPI controller which can be PCI and ACPI
> > enumerated.
> >
> > Signed-off-by: Chang, Rebecca Swee Fun
> <rebecca.swee.fun.chang at intel.com>
> > ---
> > ...add-support-for-Intel-Baytrail-SPI-contro.patch | 3278
> ++++++++++++++++++++
> > 1 file changed, 3278 insertions(+)
> > create mode 100644 meta/cfg/kernel-cache/features/valleyisland-
> io/0007-spi-pxa2xx-add-support-for-Intel-Baytrail-SPI-contro.patch
> >
> > diff --git a/meta/cfg/kernel-cache/features/valleyisland-io/0007-spi-
> pxa2xx-add-support-for-Intel-Baytrail-SPI-contro.patch b/meta/cfg/kernel-
> cache/features/valleyisland-io/0007-spi-pxa2xx-add-support-for-Intel-
> Baytrail-SPI-contro.patch
> > new file mode 100644
> > index 0000000..46902fb
> > --- /dev/null
> > +++ b/meta/cfg/kernel-cache/features/valleyisland-io/0007-spi-pxa2xx-
> add-support-for-Intel-Baytrail-SPI-contro.patch
> > @@ -0,0 +1,3278 @@
> > +spi-pxa2xx: add support for Intel Valley Island SPI controller
> > +
> > +Intel Valley Island has 1 SPI controller which can be PCI or ACPI
> enumerated.
> > +
> > +Signed-off-by: Chang, Rebecca Swee Fun
> <rebecca.swee.fun.chang at intel.com>
> > +---
> > + drivers/spi/Kconfig | 35 +-
> > + drivers/spi/Makefile | 5 +-
> > + drivers/spi/spi-pxa2xx-dma.c | 392 ++++++++++++++
> > + drivers/spi/spi-pxa2xx-pci.c | 210 +++-----
> > + drivers/spi/spi-pxa2xx-pxadma.c | 490 +++++++++++++++++
> > + drivers/spi/spi-pxa2xx.c | 1118 +++++++++++++--------------------------
> > + drivers/spi/spi-pxa2xx.h | 221 ++++++++
> > + include/linux/pxa2xx_ssp.h | 18 +
> > + include/linux/spi/pxa2xx_spi.h | 108 +---
> > + 9 files changed, 1604 insertions(+), 993 deletions(-)
> > + create mode 100644 drivers/spi/spi-pxa2xx-dma.c
> > + create mode 100644 drivers/spi/spi-pxa2xx-pxadma.c
> > + create mode 100644 drivers/spi/spi-pxa2xx.h
> > +
> > +diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
> > +index 2e188e1..bc1445e 100644
> > +--- a/drivers/spi/Kconfig
> > ++++ b/drivers/spi/Kconfig
> > +@@ -88,7 +88,7 @@ config SPI_BFIN_SPORT
> > +
> > + config SPI_AU1550
> > + tristate "Au1550/Au1200/Au1300 SPI Controller"
> > +- depends on MIPS_ALCHEMY && EXPERIMENTAL
> > ++ depends on MIPS_ALCHEMY
>
> This is the problem with these sort of backports. Clearly the source of
> this patch is from a tree without the EXPERIMENTAL Kconfig, hence why
> it is being removed from all of the SPI drivers. But that isn't something
> a patch that is *adding* support for a particular platform should do.
>
> Temporary/transition/in progress or not, we need to get these patches
> to at least indicate what development tree / upstream kernel they
> come from, so I can sort out what is new, versus the development intent
> of the patch.
>
> Bruce
>
> > + select SPI_BITBANG
> > + help
> > + If you say yes to this option, support will be included for the
> > +@@ -188,7 +188,7 @@ config SPI_IMX
> > +
> > + config SPI_LM70_LLP
> > + tristate "Parallel port adapter for LM70 eval board (DEVELOPMENT)"
> > +- depends on PARPORT && EXPERIMENTAL
> > ++ depends on PARPORT
> > + select SPI_BITBANG
> > + help
> > + This driver supports the NS LM70 LLP Evaluation Board,
> > +@@ -204,7 +204,7 @@ config SPI_MPC52xx
> > +
> > + config SPI_MPC52xx_PSC
> > + tristate "Freescale MPC52xx PSC SPI controller"
> > +- depends on PPC_MPC52xx && EXPERIMENTAL
> > ++ depends on PPC_MPC52xx
> > + help
> > + This enables using the Freescale MPC52xx Programmable Serial
> > + Controller in master SPI mode.
> > +@@ -273,8 +273,8 @@ config SPI_OMAP_100K
> > + OMAP SPI 100K master controller for omap7xx boards.
> > +
> > + config SPI_ORION
> > +- tristate "Orion SPI master (EXPERIMENTAL)"
> > +- depends on PLAT_ORION && EXPERIMENTAL
> > ++ tristate "Orion SPI master"
> > ++ depends on PLAT_ORION
> > + help
> > + This enables using the SPI master controller on the Orion chips.
> > +
> > +@@ -297,9 +297,20 @@ config SPI_PPC4xx
> > + help
> > + This selects a driver for the PPC4xx SPI Controller.
> > +
> > ++config SPI_PXA2XX_PXADMA
> > ++ bool "PXA2xx SSP legacy PXA DMA API support"
> > ++ depends on SPI_PXA2XX && ARCH_PXA
> > ++ help
> > ++ Enable PXA private legacy DMA API support. Note that this is
> > ++ deprecated in favor of generic DMA engine API.
> > ++
> > ++config SPI_PXA2XX_DMA
> > ++ def_bool y
> > ++ depends on SPI_PXA2XX && !SPI_PXA2XX_PXADMA
> > ++
> > + config SPI_PXA2XX
> > + tristate "PXA2xx SSP SPI master"
> > +- depends on (ARCH_PXA || (X86_32 && PCI)) && EXPERIMENTAL
> > ++ depends on ARCH_PXA || PCI || ACPI
> > + select PXA_SSP if ARCH_PXA
> > + help
> > + This enables using a PXA2xx or Sodaville SSP port as a SPI master
> > +@@ -307,7 +318,10 @@ config SPI_PXA2XX
> > + additional documentation can be found a
> Documentation/spi/pxa2xx.
> > +
> > + config SPI_PXA2XX_PCI
> > +- def_bool SPI_PXA2XX && X86_32 && PCI
> > ++ tristate "PCI glue for PXA2xx SSP SPI master"
> > ++ depends on SPI_PXA2XX && PCI
> > ++ help
> > ++ This enables using PXA2xx SPI controller via PCI interface.
> > +
> > + config SPI_RSPI
> > + tristate "Renesas RSPI controller"
> > +@@ -317,7 +331,7 @@ config SPI_RSPI
> > +
> > + config SPI_S3C24XX
> > + tristate "Samsung S3C24XX series SPI"
> > +- depends on ARCH_S3C24XX && EXPERIMENTAL
> > ++ depends on ARCH_S3C24XX
> > + select SPI_BITBANG
> > + help
> > + SPI driver for Samsung S3C24XX series ARM SoCs
> > +@@ -432,7 +446,7 @@ config SPI_XCOMM
> > +
> > + config SPI_XILINX
> > + tristate "Xilinx SPI controller common module"
> > +- depends on HAS_IOMEM && EXPERIMENTAL
> > ++ depends on HAS_IOMEM
> > + select SPI_BITBANG
> > + help
> > + This exposes the SPI controller IP from the Xilinx EDK.
> > +@@ -444,7 +458,7 @@ config SPI_XILINX
> > +
> > + config SPI_NUC900
> > + tristate "Nuvoton NUC900 series SPI"
> > +- depends on ARCH_W90X900 && EXPERIMENTAL
> > ++ depends on ARCH_W90X900
> > + select SPI_BITBANG
> > + help
> > + SPI driver for Nuvoton NUC900 series ARM SoCs
> > +@@ -478,7 +492,6 @@ comment "SPI Protocol Masters"
> > +
> > + config SPI_SPIDEV
> > + tristate "User mode SPI device driver support"
> > +- depends on EXPERIMENTAL
> > + help
> > + This supports user mode SPI protocol drivers.
> > +
> > +diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile
> > +index 64e970b..e53c309 100644
> > +--- a/drivers/spi/Makefile
> > ++++ b/drivers/spi/Makefile
> > +@@ -47,7 +47,10 @@ obj-$(CONFIG_SPI_OMAP24XX) +=
> spi-omap2-mcspi.o
> > + obj-$(CONFIG_SPI_ORION) += spi-orion.o
> > + obj-$(CONFIG_SPI_PL022) += spi-pl022.o
> > + obj-$(CONFIG_SPI_PPC4xx) += spi-ppc4xx.o
> > +-obj-$(CONFIG_SPI_PXA2XX) += spi-pxa2xx.o
> > ++spi-pxa2xx-platform-objs := spi-pxa2xx.o
> > ++spi-pxa2xx-platform-$(CONFIG_SPI_PXA2XX_PXADMA) += spi-
> pxa2xx-pxadma.o
> > ++spi-pxa2xx-platform-$(CONFIG_SPI_PXA2XX_DMA) += spi-
> pxa2xx-dma.o
> > ++obj-$(CONFIG_SPI_PXA2XX) += spi-pxa2xx-platform.o
> > + obj-$(CONFIG_SPI_PXA2XX_PCI) += spi-pxa2xx-pci.o
> > + obj-$(CONFIG_SPI_RSPI) += spi-rspi.o
> > + obj-$(CONFIG_SPI_S3C24XX) += spi-s3c24xx-hw.o
> > +diff --git a/drivers/spi/spi-pxa2xx-dma.c b/drivers/spi/spi-pxa2xx-dma.c
> > +new file mode 100644
> > +index 0000000..03478c2
> > +--- /dev/null
> > ++++ b/drivers/spi/spi-pxa2xx-dma.c
> > +@@ -0,0 +1,392 @@
> > ++/*
> > ++ * PXA2xx SPI DMA engine support.
> > ++ *
> > ++ * Copyright (C) 2013, Intel Corporation
> > ++ * Author: Mika Westerberg <mika.westerberg at linux.intel.com>
> > ++ *
> > ++ * This program is free software; you can redistribute it and/or modify
> > ++ * it under the terms of the GNU General Public License version 2 as
> > ++ * published by the Free Software Foundation.
> > ++ */
> > ++
> > ++#include <linux/init.h>
> > ++#include <linux/device.h>
> > ++#include <linux/dma-mapping.h>
> > ++#include <linux/dmaengine.h>
> > ++#include <linux/pxa2xx_ssp.h>
> > ++#include <linux/scatterlist.h>
> > ++#include <linux/sizes.h>
> > ++#include <linux/spi/spi.h>
> > ++#include <linux/spi/pxa2xx_spi.h>
> > ++
> > ++#include "spi-pxa2xx.h"
> > ++
> > ++static int pxa2xx_spi_map_dma_buffer(struct driver_data *drv_data,
> > ++ enum dma_data_direction dir)
> > ++{
> > ++ int i, nents, len = drv_data->len;
> > ++ struct scatterlist *sg;
> > ++ struct device *dmadev;
> > ++ struct sg_table *sgt;
> > ++ void *buf, *pbuf;
> > ++
> > ++ /*
> > ++ * Some DMA controllers have problems transferring buffers that are
> > ++ * not multiple of 4 bytes. So we truncate the transfer so that it
> > ++ * is suitable for such controllers, and handle the trailing bytes
> > ++ * manually after the DMA completes.
> > ++ *
> > ++ * REVISIT: It would be better if this information could be
> > ++ * retrieved directly from the DMA device in a similar way than
> > ++ * ->copy_align etc. is done.
> > ++ */
> > ++ len = ALIGN(drv_data->len, 4);
> > ++
> > ++ if (dir == DMA_TO_DEVICE) {
> > ++ dmadev = drv_data->tx_chan->device->dev;
> > ++ sgt = &drv_data->tx_sgt;
> > ++ buf = drv_data->tx;
> > ++ drv_data->tx_map_len = len;
> > ++ } else {
> > ++ dmadev = drv_data->rx_chan->device->dev;
> > ++ sgt = &drv_data->rx_sgt;
> > ++ buf = drv_data->rx;
> > ++ drv_data->rx_map_len = len;
> > ++ }
> > ++
> > ++ nents = DIV_ROUND_UP(len, SZ_2K);
> > ++ if (nents != sgt->nents) {
> > ++ int ret;
> > ++
> > ++ sg_free_table(sgt);
> > ++ ret = sg_alloc_table(sgt, nents, GFP_ATOMIC);
> > ++ if (ret)
> > ++ return ret;
> > ++ }
> > ++
> > ++ pbuf = buf;
> > ++ for_each_sg(sgt->sgl, sg, sgt->nents, i) {
> > ++ size_t bytes = min_t(size_t, len, SZ_2K);
> > ++
> > ++ if (buf)
> > ++ sg_set_buf(sg, pbuf, bytes);
> > ++ else
> > ++ sg_set_buf(sg, drv_data->dummy, bytes);
> > ++
> > ++ pbuf += bytes;
> > ++ len -= bytes;
> > ++ }
> > ++
> > ++ nents = dma_map_sg(dmadev, sgt->sgl, sgt->nents, dir);
> > ++ if (!nents)
> > ++ return -ENOMEM;
> > ++
> > ++ return nents;
> > ++}
> > ++
> > ++static void pxa2xx_spi_unmap_dma_buffer(struct driver_data
> *drv_data,
> > ++ enum dma_data_direction dir)
> > ++{
> > ++ struct device *dmadev;
> > ++ struct sg_table *sgt;
> > ++
> > ++ if (dir == DMA_TO_DEVICE) {
> > ++ dmadev = drv_data->tx_chan->device->dev;
> > ++ sgt = &drv_data->tx_sgt;
> > ++ } else {
> > ++ dmadev = drv_data->rx_chan->device->dev;
> > ++ sgt = &drv_data->rx_sgt;
> > ++ }
> > ++
> > ++ dma_unmap_sg(dmadev, sgt->sgl, sgt->nents, dir);
> > ++}
> > ++
> > ++static void pxa2xx_spi_unmap_dma_buffers(struct driver_data
> *drv_data)
> > ++{
> > ++ if (!drv_data->dma_mapped)
> > ++ return;
> > ++
> > ++ pxa2xx_spi_unmap_dma_buffer(drv_data, DMA_FROM_DEVICE);
> > ++ pxa2xx_spi_unmap_dma_buffer(drv_data, DMA_TO_DEVICE);
> > ++
> > ++ drv_data->dma_mapped = 0;
> > ++}
> > ++
> > ++static void pxa2xx_spi_dma_transfer_complete(struct driver_data
> *drv_data,
> > ++ bool error)
> > ++{
> > ++ struct spi_message *msg = drv_data->cur_msg;
> > ++
> > ++ /*
> > ++ * It is possible that one CPU is handling ROR interrupt and other
> > ++ * just gets DMA completion. Calling pump_transfers() twice for the
> > ++ * same transfer leads to problems thus we prevent concurrent calls
> > ++ * by using ->dma_running.
> > ++ */
> > ++ if (atomic_dec_and_test(&drv_data->dma_running)) {
> > ++ void __iomem *reg = drv_data->ioaddr;
> > ++
> > ++ /*
> > ++ * If the other CPU is still handling the ROR interrupt we
> > ++ * might not know about the error yet. So we re-check the
> > ++ * ROR bit here before we clear the status register.
> > ++ */
> > ++ if (!error) {
> > ++ u32 status = read_SSSR(reg) & drv_data->mask_sr;
> > ++ error = status & SSSR_ROR;
> > ++ }
> > ++
> > ++ /* Clear status & disable interrupts */
> > ++ write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
> > ++ write_SSSR_CS(drv_data, drv_data->clear_sr);
> > ++ if (!pxa25x_ssp_comp(drv_data))
> > ++ write_SSTO(0, reg);
> > ++
> > ++ if (!error) {
> > ++ pxa2xx_spi_unmap_dma_buffers(drv_data);
> > ++
> > ++ /* Handle the last bytes of unaligned transfer */
> > ++ drv_data->tx += drv_data->tx_map_len;
> > ++ drv_data->write(drv_data);
> > ++
> > ++ drv_data->rx += drv_data->rx_map_len;
> > ++ drv_data->read(drv_data);
> > ++
> > ++ msg->actual_length += drv_data->len;
> > ++ msg->state = pxa2xx_spi_next_transfer(drv_data);
> > ++ } else {
> > ++ /* In case we got an error we disable the SSP now */
> > ++ write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
> > ++
> > ++ msg->state = ERROR_STATE;
> > ++ }
> > ++
> > ++ tasklet_schedule(&drv_data->pump_transfers);
> > ++ }
> > ++}
> > ++
> > ++static void pxa2xx_spi_dma_callback(void *data)
> > ++{
> > ++ pxa2xx_spi_dma_transfer_complete(data, false);
> > ++}
> > ++
> > ++static struct dma_async_tx_descriptor *
> > ++pxa2xx_spi_dma_prepare_one(struct driver_data *drv_data,
> > ++ enum dma_transfer_direction dir)
> > ++{
> > ++ struct pxa2xx_spi_master *pdata = drv_data->master_info;
> > ++ struct chip_data *chip = drv_data->cur_chip;
> > ++ enum dma_slave_buswidth width;
> > ++ struct dma_slave_config cfg;
> > ++ struct dma_chan *chan;
> > ++ struct sg_table *sgt;
> > ++ int nents, ret;
> > ++
> > ++ switch (drv_data->n_bytes) {
> > ++ case 1:
> > ++ width = DMA_SLAVE_BUSWIDTH_1_BYTE;
> > ++ break;
> > ++ case 2:
> > ++ width = DMA_SLAVE_BUSWIDTH_2_BYTES;
> > ++ break;
> > ++ default:
> > ++ width = DMA_SLAVE_BUSWIDTH_4_BYTES;
> > ++ break;
> > ++ }
> > ++
> > ++ memset(&cfg, 0, sizeof(cfg));
> > ++ cfg.direction = dir;
> > ++
> > ++ if (dir == DMA_MEM_TO_DEV) {
> > ++ cfg.dst_addr = drv_data->ssdr_physical;
> > ++ cfg.dst_addr_width = width;
> > ++ cfg.dst_maxburst = chip->dma_burst_size;
> > ++ cfg.slave_id = pdata->tx_slave_id;
> > ++
> > ++ sgt = &drv_data->tx_sgt;
> > ++ nents = drv_data->tx_nents;
> > ++ chan = drv_data->tx_chan;
> > ++ } else {
> > ++ cfg.src_addr = drv_data->ssdr_physical;
> > ++ cfg.src_addr_width = width;
> > ++ cfg.src_maxburst = chip->dma_burst_size;
> > ++ cfg.slave_id = pdata->rx_slave_id;
> > ++
> > ++ sgt = &drv_data->rx_sgt;
> > ++ nents = drv_data->rx_nents;
> > ++ chan = drv_data->rx_chan;
> > ++ }
> > ++
> > ++ ret = dmaengine_slave_config(chan, &cfg);
> > ++ if (ret) {
> > ++ dev_warn(&drv_data->pdev->dev, "DMA slave config
> failed\n");
> > ++ return NULL;
> > ++ }
> > ++
> > ++ return dmaengine_prep_slave_sg(chan, sgt->sgl, nents, dir,
> > ++ DMA_PREP_INTERRUPT |
> DMA_CTRL_ACK);
> > ++}
> > ++
> > ++static bool pxa2xx_spi_dma_filter(struct dma_chan *chan, void *param)
> > ++{
> > ++ const struct pxa2xx_spi_master *pdata = param;
> > ++
> > ++ return chan->chan_id == pdata->tx_chan_id ||
> > ++ chan->chan_id == pdata->rx_chan_id;
> > ++}
> > ++
> > ++bool pxa2xx_spi_dma_is_possible(size_t len)
> > ++{
> > ++ return len <= MAX_DMA_LEN;
> > ++}
> > ++
> > ++int pxa2xx_spi_map_dma_buffers(struct driver_data *drv_data)
> > ++{
> > ++ const struct chip_data *chip = drv_data->cur_chip;
> > ++ int ret;
> > ++
> > ++ if (!chip->enable_dma)
> > ++ return 0;
> > ++
> > ++ /* Don't bother with DMA if we can't do even a single burst */
> > ++ if (drv_data->len < chip->dma_burst_size)
> > ++ return 0;
> > ++
> > ++ ret = pxa2xx_spi_map_dma_buffer(drv_data, DMA_TO_DEVICE);
> > ++ if (ret <= 0) {
> > ++ dev_warn(&drv_data->pdev->dev, "failed to DMA map
> TX\n");
> > ++ return 0;
> > ++ }
> > ++
> > ++ drv_data->tx_nents = ret;
> > ++
> > ++ ret = pxa2xx_spi_map_dma_buffer(drv_data, DMA_FROM_DEVICE);
> > ++ if (ret <= 0) {
> > ++ pxa2xx_spi_unmap_dma_buffer(drv_data,
> DMA_TO_DEVICE);
> > ++ dev_warn(&drv_data->pdev->dev, "failed to DMA map
> RX\n");
> > ++ return 0;
> > ++ }
> > ++
> > ++ drv_data->rx_nents = ret;
> > ++ return 1;
> > ++}
> > ++
> > ++irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data)
> > ++{
> > ++ u32 status;
> > ++
> > ++ status = read_SSSR(drv_data->ioaddr) & drv_data->mask_sr;
> > ++ if (status & SSSR_ROR) {
> > ++ dev_err(&drv_data->pdev->dev, "FIFO overrun\n");
> > ++
> > ++ dmaengine_terminate_all(drv_data->rx_chan);
> > ++ dmaengine_terminate_all(drv_data->tx_chan);
> > ++
> > ++ pxa2xx_spi_dma_transfer_complete(drv_data, true);
> > ++ return IRQ_HANDLED;
> > ++ }
> > ++
> > ++ return IRQ_NONE;
> > ++}
> > ++
> > ++int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32
> dma_burst)
> > ++{
> > ++ struct dma_async_tx_descriptor *tx_desc, *rx_desc;
> > ++
> > ++ tx_desc = pxa2xx_spi_dma_prepare_one(drv_data,
> DMA_MEM_TO_DEV);
> > ++ if (!tx_desc) {
> > ++ dev_err(&drv_data->pdev->dev,
> > ++ "failed to get DMA TX descriptor\n");
> > ++ return -EBUSY;
> > ++ }
> > ++
> > ++ rx_desc = pxa2xx_spi_dma_prepare_one(drv_data,
> DMA_DEV_TO_MEM);
> > ++ if (!rx_desc) {
> > ++ dev_err(&drv_data->pdev->dev,
> > ++ "failed to get DMA RX descriptor\n");
> > ++ return -EBUSY;
> > ++ }
> > ++
> > ++ /* We are ready when RX completes */
> > ++ rx_desc->callback = pxa2xx_spi_dma_callback;
> > ++ rx_desc->callback_param = drv_data;
> > ++
> > ++ dmaengine_submit(rx_desc);
> > ++ dmaengine_submit(tx_desc);
> > ++ return 0;
> > ++}
> > ++
> > ++void pxa2xx_spi_dma_start(struct driver_data *drv_data)
> > ++{
> > ++ dma_async_issue_pending(drv_data->rx_chan);
> > ++ dma_async_issue_pending(drv_data->tx_chan);
> > ++
> > ++ atomic_set(&drv_data->dma_running, 1);
> > ++}
> > ++
> > ++int pxa2xx_spi_dma_setup(struct driver_data *drv_data)
> > ++{
> > ++ struct pxa2xx_spi_master *pdata = drv_data->master_info;
> > ++ dma_cap_mask_t mask;
> > ++
> > ++ dma_cap_zero(mask);
> > ++ dma_cap_set(DMA_SLAVE, mask);
> > ++
> > ++ drv_data->dummy = devm_kzalloc(&drv_data->pdev->dev, SZ_2K,
> GFP_KERNEL);
> > ++ if (!drv_data->dummy)
> > ++ return -ENOMEM;
> > ++
> > ++ drv_data->tx_chan = dma_request_channel(mask,
> pxa2xx_spi_dma_filter,
> > ++ pdata);
> > ++ if (!drv_data->tx_chan)
> > ++ return -ENODEV;
> > ++
> > ++ drv_data->rx_chan = dma_request_channel(mask,
> pxa2xx_spi_dma_filter,
> > ++ pdata);
> > ++ if (!drv_data->rx_chan) {
> > ++ dma_release_channel(drv_data->tx_chan);
> > ++ drv_data->tx_chan = NULL;
> > ++ return -ENODEV;
> > ++ }
> > ++
> > ++ return 0;
> > ++}
> > ++
> > ++void pxa2xx_spi_dma_release(struct driver_data *drv_data)
> > ++{
> > ++ if (drv_data->rx_chan) {
> > ++ dmaengine_terminate_all(drv_data->rx_chan);
> > ++ dma_release_channel(drv_data->rx_chan);
> > ++ sg_free_table(&drv_data->rx_sgt);
> > ++ drv_data->rx_chan = NULL;
> > ++ }
> > ++ if (drv_data->tx_chan) {
> > ++ dmaengine_terminate_all(drv_data->tx_chan);
> > ++ dma_release_channel(drv_data->tx_chan);
> > ++ sg_free_table(&drv_data->tx_sgt);
> > ++ drv_data->tx_chan = NULL;
> > ++ }
> > ++}
> > ++
> > ++void pxa2xx_spi_dma_resume(struct driver_data *drv_data)
> > ++{
> > ++}
> > ++
> > ++int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
> > ++ struct spi_device *spi,
> > ++ u8 bits_per_word, u32 *burst_code,
> > ++ u32 *threshold)
> > ++{
> > ++ struct pxa2xx_spi_chip *chip_info = spi->controller_data;
> > ++
> > ++ /*
> > ++ * If the DMA burst size is given in chip_info we use that,
> > ++ * otherwise we use the default. Also we use the default FIFO
> > ++ * thresholds for now.
> > ++ */
> > ++ *burst_code = chip_info ? chip_info->dma_burst_size : 32;
> > ++ *threshold = SSCR1_RxTresh(RX_THRESH_DFLT)
> > ++ | SSCR1_TxTresh(TX_THRESH_DFLT);
> > ++
> > ++ return 0;
> > ++}
> > +diff --git a/drivers/spi/spi-pxa2xx-pci.c b/drivers/spi/spi-pxa2xx-pci.c
> > +index cf95587..a64d54e 100644
> > +--- a/drivers/spi/spi-pxa2xx-pci.c
> > ++++ b/drivers/spi/spi-pxa2xx-pci.c
> > +@@ -7,165 +7,131 @@
> > + #include <linux/of_device.h>
> > + #include <linux/module.h>
> > + #include <linux/spi/pxa2xx_spi.h>
> > ++#include <linux/clk.h>
> > +
> > +-struct ce4100_info {
> > +- struct ssp_device ssp;
> > +- struct platform_device *spi_pdev;
> > +-};
> > +-
> > +-static DEFINE_MUTEX(ssp_lock);
> > +-static LIST_HEAD(ssp_list);
> > +-
> > +-struct ssp_device *pxa_ssp_request(int port, const char *label)
> > +-{
> > +- struct ssp_device *ssp = NULL;
> > +-
> > +- mutex_lock(&ssp_lock);
> > +-
> > +- list_for_each_entry(ssp, &ssp_list, node) {
> > +- if (ssp->port_id == port && ssp->use_count == 0) {
> > +- ssp->use_count++;
> > +- ssp->label = label;
> > +- break;
> > +- }
> > +- }
> > ++static bool use_dma = 1;
> > ++module_param(use_dma, bool, 0);
> > ++MODULE_PARM_DESC(use_dma, "use_dma=1 (enable
> DMA)/use_dma=0(disable DMA)");
> > +
> > +- mutex_unlock(&ssp_lock);
> > +-
> > +- if (&ssp->node == &ssp_list)
> > +- return NULL;
> > ++enum {
> > ++ PORT_CE4100,
> > ++ PORT_BYT,
> > ++};
> > +
> > +- return ssp;
> > +-}
> > +-EXPORT_SYMBOL_GPL(pxa_ssp_request);
> > ++struct pxa2xx_spi_pci_config {
> > ++ enum pxa_ssp_type type;
> > ++ int num_cs;
> > ++ int bus_num;
> > ++ int tx_slave_id;
> > ++ int tx_chan_id;
> > ++ int rx_slave_id;
> > ++ int rx_chan_id;
> > ++};
> > +
> > +-void pxa_ssp_free(struct ssp_device *ssp)
> > +-{
> > +- mutex_lock(&ssp_lock);
> > +- if (ssp->use_count) {
> > +- ssp->use_count--;
> > +- ssp->label = NULL;
> > +- } else
> > +- dev_err(&ssp->pdev->dev, "device already free\n");
> > +- mutex_unlock(&ssp_lock);
> > +-}
> > +-EXPORT_SYMBOL_GPL(pxa_ssp_free);
> > ++static struct pxa2xx_spi_pci_config spi_pci_configs[] = {
> > ++ [PORT_CE4100] = {
> > ++ .type = PXA25x_SSP,
> > ++ .num_cs = -1,
> > ++ .bus_num = -1,
> > ++ .tx_slave_id = -1,
> > ++ .tx_chan_id = -1,
> > ++ .rx_slave_id = -1,
> > ++ .rx_chan_id = -1,
> > ++ },
> > ++ [PORT_BYT] = {
> > ++ .type = LPSS_SSP,
> > ++ .num_cs = 1,
> > ++ .bus_num = 0,
> > ++ .tx_slave_id = 0,
> > ++ .tx_chan_id = 0,
> > ++ .rx_slave_id = 1,
> > ++ .rx_chan_id = 1,
> > ++ },
> > ++};
> > +
> > +-static int ce4100_spi_probe(struct pci_dev *dev,
> > ++static int pxa2xx_spi_probe(struct pci_dev *dev,
> > + const struct pci_device_id *ent)
> > + {
> > ++ struct pxa2xx_spi_pci_config *c;
> > ++ struct platform_device_info pi;
> > + int ret;
> > +- resource_size_t phys_beg;
> > +- resource_size_t phys_len;
> > +- struct ce4100_info *spi_info;
> > + struct platform_device *pdev;
> > + struct pxa2xx_spi_master spi_pdata;
> > + struct ssp_device *ssp;
> > +
> > +- ret = pci_enable_device(dev);
> > ++ ret = pcim_enable_device(dev);
> > + if (ret)
> > + return ret;
> > +
> > +- phys_beg = pci_resource_start(dev, 0);
> > +- phys_len = pci_resource_len(dev, 0);
> > +-
> > +- if (!request_mem_region(phys_beg, phys_len,
> > +- "CE4100 SPI")) {
> > +- dev_err(&dev->dev, "Can't request register space.\n");
> > +- ret = -EBUSY;
> > ++ ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
> > ++ if (ret)
> > + return ret;
> > +- }
> > +
> > +- pdev = platform_device_alloc("pxa2xx-spi", dev->devfn);
> > +- spi_info = kzalloc(sizeof(*spi_info), GFP_KERNEL);
> > +- if (!pdev || !spi_info ) {
> > +- ret = -ENOMEM;
> > +- goto err_nomem;
> > +- }
> > +- memset(&spi_pdata, 0, sizeof(spi_pdata));
> > +- spi_pdata.num_chipselect = dev->devfn;
> > +
> > +- ret = platform_device_add_data(pdev, &spi_pdata,
> sizeof(spi_pdata));
> > +- if (ret)
> > +- goto err_nomem;
> > ++ c = &spi_pci_configs[ent->driver_data];
> > +
> > +- pdev->dev.parent = &dev->dev;
> > +- pdev->dev.of_node = dev->dev.of_node;
> > +- ssp = &spi_info->ssp;
> > ++ memset(&spi_pdata, 0, sizeof(spi_pdata));
> > ++ spi_pdata.num_chipselect = (c->num_cs >= 0) ? c->num_cs : dev-
> >devfn;
> > ++ spi_pdata.tx_slave_id = c->tx_slave_id;
> > ++ spi_pdata.tx_chan_id = c->tx_chan_id;
> > ++ spi_pdata.rx_slave_id = c->rx_slave_id;
> > ++ spi_pdata.rx_chan_id = c->rx_chan_id;
> > ++ if (use_dma)
> > ++ spi_pdata.enable_dma = c->rx_slave_id >= 0 && c-
> >tx_slave_id >= 0;
> > ++
> > ++ ssp = &spi_pdata.ssp;
> > + ssp->phys_base = pci_resource_start(dev, 0);
> > +- ssp->mmio_base = ioremap(phys_beg, phys_len);
> > ++ ssp->mmio_base = pcim_iomap_table(dev)[0];
> > + if (!ssp->mmio_base) {
> > +- dev_err(&pdev->dev, "failed to ioremap() registers\n");
> > +- ret = -EIO;
> > +- goto err_nomem;
> > ++ dev_err(&dev->dev, "failed to ioremap() registers\n");
> > ++ return -EIO;
> > + }
> > ++ ssp->clk = devm_clk_get(&dev->dev, NULL);
> > + ssp->irq = dev->irq;
> > +- ssp->port_id = pdev->id;
> > +- ssp->type = PXA25x_SSP;
> > ++ ssp->port_id = (c->bus_num >= 0) ? c->bus_num : dev->devfn;
> > ++ ssp->type = c->type;
> > +
> > +- mutex_lock(&ssp_lock);
> > +- list_add(&ssp->node, &ssp_list);
> > +- mutex_unlock(&ssp_lock);
> > ++ memset(&pi, 0, sizeof(pi));
> > ++ pi.parent = &dev->dev;
> > ++ pi.name = "pxa2xx-spi";
> > ++ pi.id = ssp->port_id;
> > ++ pi.data = &spi_pdata;
> > ++ pi.size_data = sizeof(spi_pdata);
> > +
> > +- pci_set_drvdata(dev, spi_info);
> > ++ pdev = platform_device_register_full(&pi);
> > ++ if (!pdev)
> > ++ return -ENOMEM;
> > +
> > +- ret = platform_device_add(pdev);
> > +- if (ret)
> > +- goto err_dev_add;
> > +-
> > +- return ret;
> > +-
> > +-err_dev_add:
> > +- pci_set_drvdata(dev, NULL);
> > +- mutex_lock(&ssp_lock);
> > +- list_del(&ssp->node);
> > +- mutex_unlock(&ssp_lock);
> > +- iounmap(ssp->mmio_base);
> > +-
> > +-err_nomem:
> > +- release_mem_region(phys_beg, phys_len);
> > +- platform_device_put(pdev);
> > +- kfree(spi_info);
> > +- return ret;
> > ++ pci_set_drvdata(dev, pdev);
> > ++
> > ++ return 0;
> > + }
> > +
> > +-static void ce4100_spi_remove(struct pci_dev *dev)
> > ++static void pxa2xx_spi_remove(struct pci_dev *dev)
> > + {
> > +- struct ce4100_info *spi_info;
> > +- struct ssp_device *ssp;
> > +-
> > +- spi_info = pci_get_drvdata(dev);
> > +- ssp = &spi_info->ssp;
> > +- platform_device_unregister(spi_info->spi_pdev);
> > +-
> > +- iounmap(ssp->mmio_base);
> > +- release_mem_region(pci_resource_start(dev, 0),
> > +- pci_resource_len(dev, 0));
> > +-
> > +- mutex_lock(&ssp_lock);
> > +- list_del(&ssp->node);
> > +- mutex_unlock(&ssp_lock);
> > ++ struct platform_device *pdev = pci_get_drvdata(dev);
> > +
> > +- pci_set_drvdata(dev, NULL);
> > +- pci_disable_device(dev);
> > +- kfree(spi_info);
> > ++ platform_device_unregister(pdev);
> > + }
> > +
> > +-static DEFINE_PCI_DEVICE_TABLE(ce4100_spi_devices) = {
> > +- { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e6a) },
> > ++static DEFINE_PCI_DEVICE_TABLE(pxa2xx_spi_devices) = {
> > ++ { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x2e6a),
> > ++ .driver_data = PORT_CE4100 },
> > ++ { PCI_DEVICE(PCI_VENDOR_ID_INTEL, 0x0f0e),
> > ++ .driver_data = PORT_BYT },
> > + { },
> > + };
> > +-MODULE_DEVICE_TABLE(pci, ce4100_spi_devices);
> > ++MODULE_DEVICE_TABLE(pci, pxa2xx_spi_devices);
> > +
> > +-static struct pci_driver ce4100_spi_driver = {
> > +- .name = "ce4100_spi",
> > +- .id_table = ce4100_spi_devices,
> > +- .probe = ce4100_spi_probe,
> > +- .remove = ce4100_spi_remove,
> > ++static struct pci_driver pxa2xx_spi_driver = {
> > ++ .name = "pxa2xx_spi",
> > ++ .id_table = pxa2xx_spi_devices,
> > ++ .probe = pxa2xx_spi_probe,
> > ++ .remove = pxa2xx_spi_remove,
> > + };
> > +
> > +-module_pci_driver(ce4100_spi_driver);
> > ++module_pci_driver(pxa2xx_spi_driver);
> > +
> > +-MODULE_DESCRIPTION("CE4100 PCI-SPI glue code for PXA's driver");
> > ++MODULE_DESCRIPTION("PCI-SPI glue code for PXA's driver");
> > + MODULE_LICENSE("GPL v2");
> > + MODULE_AUTHOR("Sebastian Andrzej Siewior
> <bigeasy at linutronix.de>");
> > +diff --git a/drivers/spi/spi-pxa2xx-pxadma.c b/drivers/spi/spi-pxa2xx-
> pxadma.c
> > +new file mode 100644
> > +index 0000000..2916efc
> > +--- /dev/null
> > ++++ b/drivers/spi/spi-pxa2xx-pxadma.c
> > +@@ -0,0 +1,490 @@
> > ++/*
> > ++ * PXA2xx SPI private DMA support.
> > ++ *
> > ++ * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
> > ++ *
> > ++ * This program is free software; you can redistribute it and/or modify
> > ++ * it under the terms of the GNU General Public License as published by
> > ++ * the Free Software Foundation; either version 2 of the License, or
> > ++ * (at your option) any later version.
> > ++ *
> > ++ * This program is distributed in the hope that it will be useful,
> > ++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
> > ++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> > ++ * GNU General Public License for more details.
> > ++ *
> > ++ * You should have received a copy of the GNU General Public License
> > ++ * along with this program; if not, write to the Free Software
> > ++ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
> > ++ */
> > ++
> > ++#include <linux/init.h>
> > ++#include <linux/delay.h>
> > ++#include <linux/device.h>
> > ++#include <linux/dma-mapping.h>
> > ++#include <linux/pxa2xx_ssp.h>
> > ++#include <linux/spi/spi.h>
> > ++#include <linux/spi/pxa2xx_spi.h>
> > ++
> > ++#include "spi-pxa2xx.h"
> > ++
> > ++#define DMA_INT_MASK (DCSR_ENDINTR | DCSR_STARTINTR |
> DCSR_BUSERR)
> > ++#define RESET_DMA_CHANNEL (DCSR_NODESC | DMA_INT_MASK)
> > ++
> > ++bool pxa2xx_spi_dma_is_possible(size_t len)
> > ++{
> > ++ /* Try to map dma buffer and do a dma transfer if successful, but
> > ++ * only if the length is non-zero and less than MAX_DMA_LEN.
> > ++ *
> > ++ * Zero-length non-descriptor DMA is illegal on PXA2xx; force use
> > ++ * of PIO instead. Care is needed above because the transfer may
> > ++ * have have been passed with buffers that are already dma mapped.
> > ++ * A zero-length transfer in PIO mode will not try to write/read
> > ++ * to/from the buffers
> > ++ *
> > ++ * REVISIT large transfers are exactly where we most want to be
> > ++ * using DMA. If this happens much, split those transfers into
> > ++ * multiple DMA segments rather than forcing PIO.
> > ++ */
> > ++ return len > 0 && len <= MAX_DMA_LEN;
> > ++}
> > ++
> > ++int pxa2xx_spi_map_dma_buffers(struct driver_data *drv_data)
> > ++{
> > ++ struct spi_message *msg = drv_data->cur_msg;
> > ++ struct device *dev = &msg->spi->dev;
> > ++
> > ++ if (!drv_data->cur_chip->enable_dma)
> > ++ return 0;
> > ++
> > ++ if (msg->is_dma_mapped)
> > ++ return drv_data->rx_dma && drv_data->tx_dma;
> > ++
> > ++ if (!IS_DMA_ALIGNED(drv_data->rx)
> || !IS_DMA_ALIGNED(drv_data->tx))
> > ++ return 0;
> > ++
> > ++ /* Modify setup if rx buffer is null */
> > ++ if (drv_data->rx == NULL) {
> > ++ *drv_data->null_dma_buf = 0;
> > ++ drv_data->rx = drv_data->null_dma_buf;
> > ++ drv_data->rx_map_len = 4;
> > ++ } else
> > ++ drv_data->rx_map_len = drv_data->len;
> > ++
> > ++
> > ++ /* Modify setup if tx buffer is null */
> > ++ if (drv_data->tx == NULL) {
> > ++ *drv_data->null_dma_buf = 0;
> > ++ drv_data->tx = drv_data->null_dma_buf;
> > ++ drv_data->tx_map_len = 4;
> > ++ } else
> > ++ drv_data->tx_map_len = drv_data->len;
> > ++
> > ++ /* Stream map the tx buffer. Always do DMA_TO_DEVICE first
> > ++ * so we flush the cache *before* invalidating it, in case
> > ++ * the tx and rx buffers overlap.
> > ++ */
> > ++ drv_data->tx_dma = dma_map_single(dev, drv_data->tx,
> > ++ drv_data->tx_map_len,
> DMA_TO_DEVICE);
> > ++ if (dma_mapping_error(dev, drv_data->tx_dma))
> > ++ return 0;
> > ++
> > ++ /* Stream map the rx buffer */
> > ++ drv_data->rx_dma = dma_map_single(dev, drv_data->rx,
> > ++ drv_data->rx_map_len,
> DMA_FROM_DEVICE);
> > ++ if (dma_mapping_error(dev, drv_data->rx_dma)) {
> > ++ dma_unmap_single(dev, drv_data->tx_dma,
> > ++ drv_data->tx_map_len,
> DMA_TO_DEVICE);
> > ++ return 0;
> > ++ }
> > ++
> > ++ return 1;
> > ++}
> > ++
> > ++static void pxa2xx_spi_unmap_dma_buffers(struct driver_data
> *drv_data)
> > ++{
> > ++ struct device *dev;
> > ++
> > ++ if (!drv_data->dma_mapped)
> > ++ return;
> > ++
> > ++ if (!drv_data->cur_msg->is_dma_mapped) {
> > ++ dev = &drv_data->cur_msg->spi->dev;
> > ++ dma_unmap_single(dev, drv_data->rx_dma,
> > ++ drv_data->rx_map_len,
> DMA_FROM_DEVICE);
> > ++ dma_unmap_single(dev, drv_data->tx_dma,
> > ++ drv_data->tx_map_len,
> DMA_TO_DEVICE);
> > ++ }
> > ++
> > ++ drv_data->dma_mapped = 0;
> > ++}
> > ++
> > ++static int wait_ssp_rx_stall(void const __iomem *ioaddr)
> > ++{
> > ++ unsigned long limit = loops_per_jiffy << 1;
> > ++
> > ++ while ((read_SSSR(ioaddr) & SSSR_BSY) && --limit)
> > ++ cpu_relax();
> > ++
> > ++ return limit;
> > ++}
> > ++
> > ++static int wait_dma_channel_stop(int channel)
> > ++{
> > ++ unsigned long limit = loops_per_jiffy << 1;
> > ++
> > ++ while (!(DCSR(channel) & DCSR_STOPSTATE) && --limit)
> > ++ cpu_relax();
> > ++
> > ++ return limit;
> > ++}
> > ++
> > ++static void pxa2xx_spi_dma_error_stop(struct driver_data *drv_data,
> > ++ const char *msg)
> > ++{
> > ++ void __iomem *reg = drv_data->ioaddr;
> > ++
> > ++ /* Stop and reset */
> > ++ DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
> > ++ DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
> > ++ write_SSSR_CS(drv_data, drv_data->clear_sr);
> > ++ write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
> > ++ if (!pxa25x_ssp_comp(drv_data))
> > ++ write_SSTO(0, reg);
> > ++ pxa2xx_spi_flush(drv_data);
> > ++ write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
> > ++
> > ++ pxa2xx_spi_unmap_dma_buffers(drv_data);
> > ++
> > ++ dev_err(&drv_data->pdev->dev, "%s\n", msg);
> > ++
> > ++ drv_data->cur_msg->state = ERROR_STATE;
> > ++ tasklet_schedule(&drv_data->pump_transfers);
> > ++}
> > ++
> > ++static void pxa2xx_spi_dma_transfer_complete(struct driver_data
> *drv_data)
> > ++{
> > ++ void __iomem *reg = drv_data->ioaddr;
> > ++ struct spi_message *msg = drv_data->cur_msg;
> > ++
> > ++ /* Clear and disable interrupts on SSP and DMA channels*/
> > ++ write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
> > ++ write_SSSR_CS(drv_data, drv_data->clear_sr);
> > ++ DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
> > ++ DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
> > ++
> > ++ if (wait_dma_channel_stop(drv_data->rx_channel) == 0)
> > ++ dev_err(&drv_data->pdev->dev,
> > ++ "dma_handler: dma rx channel stop failed\n");
> > ++
> > ++ if (wait_ssp_rx_stall(drv_data->ioaddr) == 0)
> > ++ dev_err(&drv_data->pdev->dev,
> > ++ "dma_transfer: ssp rx stall failed\n");
> > ++
> > ++ pxa2xx_spi_unmap_dma_buffers(drv_data);
> > ++
> > ++ /* update the buffer pointer for the amount completed in dma */
> > ++ drv_data->rx += drv_data->len -
> > ++ (DCMD(drv_data->rx_channel) & DCMD_LENGTH);
> > ++
> > ++ /* read trailing data from fifo, it does not matter how many
> > ++ * bytes are in the fifo just read until buffer is full
> > ++ * or fifo is empty, which ever occurs first */
> > ++ drv_data->read(drv_data);
> > ++
> > ++ /* return count of what was actually read */
> > ++ msg->actual_length += drv_data->len -
> > ++ (drv_data->rx_end - drv_data->rx);
> > ++
> > ++ /* Transfer delays and chip select release are
> > ++ * handled in pump_transfers or giveback
> > ++ */
> > ++
> > ++ /* Move to next transfer */
> > ++ msg->state = pxa2xx_spi_next_transfer(drv_data);
> > ++
> > ++ /* Schedule transfer tasklet */
> > ++ tasklet_schedule(&drv_data->pump_transfers);
> > ++}
> > ++
> > ++void pxa2xx_spi_dma_handler(int channel, void *data)
> > ++{
> > ++ struct driver_data *drv_data = data;
> > ++ u32 irq_status = DCSR(channel) & DMA_INT_MASK;
> > ++
> > ++ if (irq_status & DCSR_BUSERR) {
> > ++
> > ++ if (channel == drv_data->tx_channel)
> > ++ pxa2xx_spi_dma_error_stop(drv_data,
> > ++ "dma_handler: bad bus address on tx
> channel");
> > ++ else
> > ++ pxa2xx_spi_dma_error_stop(drv_data,
> > ++ "dma_handler: bad bus address on rx
> channel");
> > ++ return;
> > ++ }
> > ++
> > ++ /* PXA255x_SSP has no timeout interrupt, wait for tailing bytes */
> > ++ if ((channel == drv_data->tx_channel)
> > ++ && (irq_status & DCSR_ENDINTR)
> > ++ && (drv_data->ssp_type == PXA25x_SSP)) {
> > ++
> > ++ /* Wait for rx to stall */
> > ++ if (wait_ssp_rx_stall(drv_data->ioaddr) == 0)
> > ++ dev_err(&drv_data->pdev->dev,
> > ++ "dma_handler: ssp rx stall failed\n");
> > ++
> > ++ /* finish this transfer, start the next */
> > ++ pxa2xx_spi_dma_transfer_complete(drv_data);
> > ++ }
> > ++}
> > ++
> > ++irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data *drv_data)
> > ++{
> > ++ u32 irq_status;
> > ++ void __iomem *reg = drv_data->ioaddr;
> > ++
> > ++ irq_status = read_SSSR(reg) & drv_data->mask_sr;
> > ++ if (irq_status & SSSR_ROR) {
> > ++ pxa2xx_spi_dma_error_stop(drv_data,
> > ++ "dma_transfer: fifo overrun");
> > ++ return IRQ_HANDLED;
> > ++ }
> > ++
> > ++ /* Check for false positive timeout */
> > ++ if ((irq_status & SSSR_TINT)
> > ++ && (DCSR(drv_data->tx_channel) & DCSR_RUN)) {
> > ++ write_SSSR(SSSR_TINT, reg);
> > ++ return IRQ_HANDLED;
> > ++ }
> > ++
> > ++ if (irq_status & SSSR_TINT || drv_data->rx == drv_data->rx_end) {
> > ++
> > ++ /* Clear and disable timeout interrupt, do the rest in
> > ++ * dma_transfer_complete */
> > ++ if (!pxa25x_ssp_comp(drv_data))
> > ++ write_SSTO(0, reg);
> > ++
> > ++ /* finish this transfer, start the next */
> > ++ pxa2xx_spi_dma_transfer_complete(drv_data);
> > ++
> > ++ return IRQ_HANDLED;
> > ++ }
> > ++
> > ++ /* Opps problem detected */
> > ++ return IRQ_NONE;
> > ++}
> > ++
> > ++int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32
> dma_burst)
> > ++{
> > ++ u32 dma_width;
> > ++
> > ++ switch (drv_data->n_bytes) {
> > ++ case 1:
> > ++ dma_width = DCMD_WIDTH1;
> > ++ break;
> > ++ case 2:
> > ++ dma_width = DCMD_WIDTH2;
> > ++ break;
> > ++ default:
> > ++ dma_width = DCMD_WIDTH4;
> > ++ break;
> > ++ }
> > ++
> > ++ /* Setup rx DMA Channel */
> > ++ DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
> > ++ DSADR(drv_data->rx_channel) = drv_data->ssdr_physical;
> > ++ DTADR(drv_data->rx_channel) = drv_data->rx_dma;
> > ++ if (drv_data->rx == drv_data->null_dma_buf)
> > ++ /* No target address increment */
> > ++ DCMD(drv_data->rx_channel) = DCMD_FLOWSRC
> > ++ | dma_width
> > ++ | dma_burst
> > ++ | drv_data->len;
> > ++ else
> > ++ DCMD(drv_data->rx_channel) = DCMD_INCTRGADDR
> > ++ | DCMD_FLOWSRC
> > ++ | dma_width
> > ++ | dma_burst
> > ++ | drv_data->len;
> > ++
> > ++ /* Setup tx DMA Channel */
> > ++ DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
> > ++ DSADR(drv_data->tx_channel) = drv_data->tx_dma;
> > ++ DTADR(drv_data->tx_channel) = drv_data->ssdr_physical;
> > ++ if (drv_data->tx == drv_data->null_dma_buf)
> > ++ /* No source address increment */
> > ++ DCMD(drv_data->tx_channel) = DCMD_FLOWTRG
> > ++ | dma_width
> > ++ | dma_burst
> > ++ | drv_data->len;
> > ++ else
> > ++ DCMD(drv_data->tx_channel) = DCMD_INCSRCADDR
> > ++ | DCMD_FLOWTRG
> > ++ | dma_width
> > ++ | dma_burst
> > ++ | drv_data->len;
> > ++
> > ++ /* Enable dma end irqs on SSP to detect end of transfer */
> > ++ if (drv_data->ssp_type == PXA25x_SSP)
> > ++ DCMD(drv_data->tx_channel) |= DCMD_ENDIRQEN;
> > ++
> > ++ return 0;
> > ++}
> > ++
> > ++void pxa2xx_spi_dma_start(struct driver_data *drv_data)
> > ++{
> > ++ DCSR(drv_data->rx_channel) |= DCSR_RUN;
> > ++ DCSR(drv_data->tx_channel) |= DCSR_RUN;
> > ++}
> > ++
> > ++int pxa2xx_spi_dma_setup(struct driver_data *drv_data)
> > ++{
> > ++ struct device *dev = &drv_data->pdev->dev;
> > ++ struct ssp_device *ssp = drv_data->ssp;
> > ++
> > ++ /* Get two DMA channels (rx and tx) */
> > ++ drv_data->rx_channel = pxa_request_dma("pxa2xx_spi_ssp_rx",
> > ++ DMA_PRIO_HIGH,
> > ++ pxa2xx_spi_dma_handler,
> > ++ drv_data);
> > ++ if (drv_data->rx_channel < 0) {
> > ++ dev_err(dev, "problem (%d) requesting rx channel\n",
> > ++ drv_data->rx_channel);
> > ++ return -ENODEV;
> > ++ }
> > ++ drv_data->tx_channel = pxa_request_dma("pxa2xx_spi_ssp_tx",
> > ++ DMA_PRIO_MEDIUM,
> > ++ pxa2xx_spi_dma_handler,
> > ++ drv_data);
> > ++ if (drv_data->tx_channel < 0) {
> > ++ dev_err(dev, "problem (%d) requesting tx channel\n",
> > ++ drv_data->tx_channel);
> > ++ pxa_free_dma(drv_data->rx_channel);
> > ++ return -ENODEV;
> > ++ }
> > ++
> > ++ DRCMR(ssp->drcmr_rx) = DRCMR_MAPVLD | drv_data->rx_channel;
> > ++ DRCMR(ssp->drcmr_tx) = DRCMR_MAPVLD | drv_data->tx_channel;
> > ++
> > ++ return 0;
> > ++}
> > ++
> > ++void pxa2xx_spi_dma_release(struct driver_data *drv_data)
> > ++{
> > ++ struct ssp_device *ssp = drv_data->ssp;
> > ++
> > ++ DRCMR(ssp->drcmr_rx) = 0;
> > ++ DRCMR(ssp->drcmr_tx) = 0;
> > ++
> > ++ if (drv_data->tx_channel != 0)
> > ++ pxa_free_dma(drv_data->tx_channel);
> > ++ if (drv_data->rx_channel != 0)
> > ++ pxa_free_dma(drv_data->rx_channel);
> > ++}
> > ++
> > ++void pxa2xx_spi_dma_resume(struct driver_data *drv_data)
> > ++{
> > ++ if (drv_data->rx_channel != -1)
> > ++ DRCMR(drv_data->ssp->drcmr_rx) =
> > ++ DRCMR_MAPVLD | drv_data->rx_channel;
> > ++ if (drv_data->tx_channel != -1)
> > ++ DRCMR(drv_data->ssp->drcmr_tx) =
> > ++ DRCMR_MAPVLD | drv_data->tx_channel;
> > ++}
> > ++
> > ++int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data *chip,
> > ++ struct spi_device *spi,
> > ++ u8 bits_per_word, u32 *burst_code,
> > ++ u32 *threshold)
> > ++{
> > ++ struct pxa2xx_spi_chip *chip_info =
> > ++ (struct pxa2xx_spi_chip *)spi->controller_data;
> > ++ int bytes_per_word;
> > ++ int burst_bytes;
> > ++ int thresh_words;
> > ++ int req_burst_size;
> > ++ int retval = 0;
> > ++
> > ++ /* Set the threshold (in registers) to equal the same amount of data
> > ++ * as represented by burst size (in bytes). The computation below
> > ++ * is (burst_size rounded up to nearest 8 byte, word or long word)
> > ++ * divided by (bytes/register); the tx threshold is the inverse of
> > ++ * the rx, so that there will always be enough data in the rx fifo
> > ++ * to satisfy a burst, and there will always be enough space in the
> > ++ * tx fifo to accept a burst (a tx burst will overwrite the fifo if
> > ++ * there is not enough space), there must always remain enough
> empty
> > ++ * space in the rx fifo for any data loaded to the tx fifo.
> > ++ * Whenever burst_size (in bytes) equals bits/word, the fifo
> threshold
> > ++ * will be 8, or half the fifo;
> > ++ * The threshold can only be set to 2, 4 or 8, but not 16, because
> > ++ * to burst 16 to the tx fifo, the fifo would have to be empty;
> > ++ * however, the minimum fifo trigger level is 1, and the tx will
> > ++ * request service when the fifo is at this level, with only 15 spaces.
> > ++ */
> > ++
> > ++ /* find bytes/word */
> > ++ if (bits_per_word <= 8)
> > ++ bytes_per_word = 1;
> > ++ else if (bits_per_word <= 16)
> > ++ bytes_per_word = 2;
> > ++ else
> > ++ bytes_per_word = 4;
> > ++
> > ++ /* use struct pxa2xx_spi_chip->dma_burst_size if available */
> > ++ if (chip_info)
> > ++ req_burst_size = chip_info->dma_burst_size;
> > ++ else {
> > ++ switch (chip->dma_burst_size) {
> > ++ default:
> > ++ /* if the default burst size is not set,
> > ++ * do it now */
> > ++ chip->dma_burst_size = DCMD_BURST8;
> > ++ case DCMD_BURST8:
> > ++ req_burst_size = 8;
> > ++ break;
> > ++ case DCMD_BURST16:
> > ++ req_burst_size = 16;
> > ++ break;
> > ++ case DCMD_BURST32:
> > ++ req_burst_size = 32;
> > ++ break;
> > ++ }
> > ++ }
> > ++ if (req_burst_size <= 8) {
> > ++ *burst_code = DCMD_BURST8;
> > ++ burst_bytes = 8;
> > ++ } else if (req_burst_size <= 16) {
> > ++ if (bytes_per_word == 1) {
> > ++ /* don't burst more than 1/2 the fifo */
> > ++ *burst_code = DCMD_BURST8;
> > ++ burst_bytes = 8;
> > ++ retval = 1;
> > ++ } else {
> > ++ *burst_code = DCMD_BURST16;
> > ++ burst_bytes = 16;
> > ++ }
> > ++ } else {
> > ++ if (bytes_per_word == 1) {
> > ++ /* don't burst more than 1/2 the fifo */
> > ++ *burst_code = DCMD_BURST8;
> > ++ burst_bytes = 8;
> > ++ retval = 1;
> > ++ } else if (bytes_per_word == 2) {
> > ++ /* don't burst more than 1/2 the fifo */
> > ++ *burst_code = DCMD_BURST16;
> > ++ burst_bytes = 16;
> > ++ retval = 1;
> > ++ } else {
> > ++ *burst_code = DCMD_BURST32;
> > ++ burst_bytes = 32;
> > ++ }
> > ++ }
> > ++
> > ++ thresh_words = burst_bytes / bytes_per_word;
> > ++
> > ++ /* thresh_words will be between 2 and 8 */
> > ++ *threshold = (SSCR1_RxTresh(thresh_words) & SSCR1_RFT)
> > ++ | (SSCR1_TxTresh(16-thresh_words) & SSCR1_TFT);
> > ++
> > ++ return retval;
> > ++}
> > +diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
> > +index 5c8c4f5..b4651b8 100644
> > +--- a/drivers/spi/spi-pxa2xx.c
> > ++++ b/drivers/spi/spi-pxa2xx.c
> > +@@ -1,5 +1,6 @@
> > + /*
> > + * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
> > ++ * Copyright (C) 2013, Intel Corporation
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License as published by
> > +@@ -24,17 +25,24 @@
> > + #include <linux/interrupt.h>
> > + #include <linux/platform_device.h>
> > + #include <linux/spi/pxa2xx_spi.h>
> > +-#include <linux/dma-mapping.h>
> > + #include <linux/spi/spi.h>
> > + #include <linux/workqueue.h>
> > + #include <linux/delay.h>
> > + #include <linux/gpio.h>
> > + #include <linux/slab.h>
> > ++#include <linux/clk.h>
> > ++#include <linux/pm_runtime.h>
> > ++#include <linux/acpi.h>
> > +
> > + #include <asm/io.h>
> > + #include <asm/irq.h>
> > + #include <asm/delay.h>
> > +
> > ++#include "spi-pxa2xx.h"
> > ++
> > ++static bool use_dma = 1;
> > ++module_param(use_dma, bool, 0);
> > ++MODULE_PARM_DESC(use_dma, "use_dma=1 (enable
> DMA)/use_dma=0(disable DMA)");
> > +
> > + MODULE_AUTHOR("Stephen Street");
> > + MODULE_DESCRIPTION("PXA2xx SSP SPI Controller");
> > +@@ -45,12 +53,6 @@ MODULE_ALIAS("platform:pxa2xx-spi");
> > +
> > + #define TIMOUT_DFLT 1000
> > +
> > +-#define DMA_INT_MASK (DCSR_ENDINTR | DCSR_STARTINTR |
> DCSR_BUSERR)
> > +-#define RESET_DMA_CHANNEL (DCSR_NODESC | DMA_INT_MASK)
> > +-#define IS_DMA_ALIGNED(x) ((((u32)(x)) & 0x07) == 0)
> > +-#define MAX_DMA_LEN 8191
> > +-#define DMA_ALIGNMENT 8
> > +-
> > + /*
> > + * for testing SSCR1 changes that require SSP restart, basically
> > + * everything except the service and interrupt enables, the pxa270
> developer
> > +@@ -65,115 +67,107 @@ MODULE_ALIAS("platform:pxa2xx-spi");
> > + | SSCR1_RFT | SSCR1_TFT | SSCR1_MWDS \
> > + | SSCR1_SPH | SSCR1_SPO | SSCR1_LBM)
> > +
> > +-#define DEFINE_SSP_REG(reg, off) \
> > +-static inline u32 read_##reg(void const __iomem *p) \
> > +-{ return __raw_readl(p + (off)); } \
> > +-\
> > +-static inline void write_##reg(u32 v, void __iomem *p) \
> > +-{ __raw_writel(v, p + (off)); }
> > +-
> > +-DEFINE_SSP_REG(SSCR0, 0x00)
> > +-DEFINE_SSP_REG(SSCR1, 0x04)
> > +-DEFINE_SSP_REG(SSSR, 0x08)
> > +-DEFINE_SSP_REG(SSITR, 0x0c)
> > +-DEFINE_SSP_REG(SSDR, 0x10)
> > +-DEFINE_SSP_REG(SSTO, 0x28)
> > +-DEFINE_SSP_REG(SSPSP, 0x2c)
> > +-
> > +-#define START_STATE ((void*)0)
> > +-#define RUNNING_STATE ((void*)1)
> > +-#define DONE_STATE ((void*)2)
> > +-#define ERROR_STATE ((void*)-1)
> > +-
> > +-#define QUEUE_RUNNING 0
> > +-#define QUEUE_STOPPED 1
> > +-
> > +-struct driver_data {
> > +- /* Driver model hookup */
> > +- struct platform_device *pdev;
> > +-
> > +- /* SSP Info */
> > +- struct ssp_device *ssp;
> > ++#define LPSS_RX_THRESH_DFLT 64
> > ++#define LPSS_TX_LOTHRESH_DFLT 160
> > ++#define LPSS_TX_HITHRESH_DFLT 224
> > +
> > +- /* SPI framework hookup */
> > +- enum pxa_ssp_type ssp_type;
> > +- struct spi_master *master;
> > ++/* Offset from drv_data->lpss_base */
> > ++#define SSP_REG 0x0c
> > ++#define GENERAL_REG 0x08
> > ++#define SPI_CS_CONTROL 0x18
> > ++#define SPI_CS_CONTROL_SW_MODE BIT(0)
> > ++#define SPI_CS_CONTROL_CS_HIGH BIT(1)
> > +
> > +- /* PXA hookup */
> > +- struct pxa2xx_spi_master *master_info;
> > +-
> > +- /* DMA setup stuff */
> > +- int rx_channel;
> > +- int tx_channel;
> > +- u32 *null_dma_buf;
> > +-
> > +- /* SSP register addresses */
> > +- void __iomem *ioaddr;
> > +- u32 ssdr_physical;
> > +-
> > +- /* SSP masks*/
> > +- u32 dma_cr1;
> > +- u32 int_cr1;
> > +- u32 clear_sr;
> > +- u32 mask_sr;
> > +-
> > +- /* Driver message queue */
> > +- struct workqueue_struct *workqueue;
> > +- struct work_struct pump_messages;
> > +- spinlock_t lock;
> > +- struct list_head queue;
> > +- int busy;
> > +- int run;
> > +-
> > +- /* Message Transfer pump */
> > +- struct tasklet_struct pump_transfers;
> > +-
> > +- /* Current message transfer state info */
> > +- struct spi_message* cur_msg;
> > +- struct spi_transfer* cur_transfer;
> > +- struct chip_data *cur_chip;
> > +- size_t len;
> > +- void *tx;
> > +- void *tx_end;
> > +- void *rx;
> > +- void *rx_end;
> > +- int dma_mapped;
> > +- dma_addr_t rx_dma;
> > +- dma_addr_t tx_dma;
> > +- size_t rx_map_len;
> > +- size_t tx_map_len;
> > +- u8 n_bytes;
> > +- u32 dma_width;
> > +- int (*write)(struct driver_data *drv_data);
> > +- int (*read)(struct driver_data *drv_data);
> > +- irqreturn_t (*transfer_handler)(struct driver_data *drv_data);
> > +- void (*cs_control)(u32 command);
> > +-};
> > ++static bool is_lpss_ssp(const struct driver_data *drv_data)
> > ++{
> > ++ return drv_data->ssp_type == LPSS_SSP;
> > ++}
> > +
> > +-struct chip_data {
> > +- u32 cr0;
> > +- u32 cr1;
> > +- u32 psp;
> > +- u32 timeout;
> > +- u8 n_bytes;
> > +- u32 dma_width;
> > +- u32 dma_burst_size;
> > +- u32 threshold;
> > +- u32 dma_threshold;
> > +- u8 enable_dma;
> > +- u8 bits_per_word;
> > +- u32 speed_hz;
> > +- union {
> > +- int gpio_cs;
> > +- unsigned int frm;
> > +- };
> > +- int gpio_cs_inverted;
> > +- int (*write)(struct driver_data *drv_data);
> > +- int (*read)(struct driver_data *drv_data);
> > +- void (*cs_control)(u32 command);
> > +-};
> > ++/*
> > ++ * Read and write LPSS SSP private registers. Caller must first check that
> > ++ * is_lpss_ssp() returns true before these can be called.
> > ++ */
> > ++static u32 __lpss_ssp_read_priv(struct driver_data *drv_data, unsigned
> offset)
> > ++{
> > ++ WARN_ON(!drv_data->lpss_base);
> > ++ return readl(drv_data->lpss_base + offset);
> > ++}
> > ++
> > ++static void __lpss_ssp_write_priv(struct driver_data *drv_data,
> > ++ unsigned offset, u32 value)
> > ++{
> > ++ WARN_ON(!drv_data->lpss_base);
> > ++ writel(value, drv_data->lpss_base + offset);
> > ++}
> > ++
> > ++/*
> > ++ * lpss_ssp_setup - perform LPSS SSP specific setup
> > ++ * @drv_data: pointer to the driver private data
> > ++ *
> > ++ * Perform LPSS SSP specific setup. This function must be called first if
> > ++ * one is going to use LPSS SSP private registers.
> > ++ */
> > ++static void lpss_ssp_setup(struct driver_data *drv_data)
> > ++{
> > ++ unsigned offset = 0x400;
> > ++ u32 value, orig;
> > ++
> > ++ if (!is_lpss_ssp(drv_data))
> > ++ return;
> > ++
> > ++ /*
> > ++ * Perform auto-detection of the LPSS SSP private registers. They
> > ++ * can be either at 1k or 2k offset from the base address.
> > ++ */
> > ++ orig = readl(drv_data->ioaddr + offset + SPI_CS_CONTROL);
> > ++
> > ++ value = orig | SPI_CS_CONTROL_SW_MODE;
> > ++ writel(value, drv_data->ioaddr + offset + SPI_CS_CONTROL);
> > ++ value = readl(drv_data->ioaddr + offset + SPI_CS_CONTROL);
> > ++ if (value != (orig | SPI_CS_CONTROL_SW_MODE)) {
> > ++ offset = 0x800;
> > ++ goto detection_done;
> > ++ }
> > ++
> > ++ value &= ~SPI_CS_CONTROL_SW_MODE;
> > ++ writel(value, drv_data->ioaddr + offset + SPI_CS_CONTROL);
> > ++ value = readl(drv_data->ioaddr + offset + SPI_CS_CONTROL);
> > ++ if (value != orig) {
> > ++ offset = 0x800;
> > ++ goto detection_done;
> > ++ }
> > ++
> > ++detection_done:
> > ++ /* Now set the LPSS base */
> > ++ drv_data->lpss_base = drv_data->ioaddr + offset;
> > ++
> > ++ /* Enable software chip select control */
> > ++ value = SPI_CS_CONTROL_SW_MODE | SPI_CS_CONTROL_CS_HIGH;
> > ++ __lpss_ssp_write_priv(drv_data, SPI_CS_CONTROL, value);
> > ++
> > ++ /* Enable multiblock DMA transfers */
> > ++ if (drv_data->master_info->enable_dma){
> > ++ __lpss_ssp_write_priv(drv_data, SSP_REG, 1);
> > ++ value = readl(drv_data->ioaddr + offset + GENERAL_REG);
> > ++ value |= BIT(24);
> > ++ __lpss_ssp_write_priv(drv_data, GENERAL_REG, value);
> > ++ }
> > ++}
> > ++
> > ++static void lpss_ssp_cs_control(struct driver_data *drv_data, bool
> enable)
> > ++{
> > ++ u32 value;
> > ++
> > ++ if (!is_lpss_ssp(drv_data))
> > ++ return;
> > +
> > +-static void pump_messages(struct work_struct *work);
> > ++ value = __lpss_ssp_read_priv(drv_data, SPI_CS_CONTROL);
> > ++ if (enable)
> > ++ value &= ~SPI_CS_CONTROL_CS_HIGH;
> > ++ else
> > ++ value |= SPI_CS_CONTROL_CS_HIGH;
> > ++ __lpss_ssp_write_priv(drv_data, SPI_CS_CONTROL, value);
> > ++}
> > +
> > + static void cs_assert(struct driver_data *drv_data)
> > + {
> > +@@ -189,8 +183,12 @@ static void cs_assert(struct driver_data *drv_data)
> > + return;
> > + }
> > +
> > +- if (gpio_is_valid(chip->gpio_cs))
> > ++ if (gpio_is_valid(chip->gpio_cs)) {
> > + gpio_set_value(chip->gpio_cs, chip->gpio_cs_inverted);
> > ++ return;
> > ++ }
> > ++
> > ++ lpss_ssp_cs_control(drv_data, true);
> > + }
> > +
> > + static void cs_deassert(struct driver_data *drv_data)
> > +@@ -205,30 +203,15 @@ static void cs_deassert(struct driver_data
> *drv_data)
> > + return;
> > + }
> > +
> > +- if (gpio_is_valid(chip->gpio_cs))
> > ++ if (gpio_is_valid(chip->gpio_cs)) {
> > + gpio_set_value(chip->gpio_cs, !chip->gpio_cs_inverted);
> > +-}
> > +-
> > +-static void write_SSSR_CS(struct driver_data *drv_data, u32 val)
> > +-{
> > +- void __iomem *reg = drv_data->ioaddr;
> > +-
> > +- if (drv_data->ssp_type == CE4100_SSP)
> > +- val |= read_SSSR(reg) & SSSR_ALT_FRM_MASK;
> > ++ return;
> > ++ }
> > +
> > +- write_SSSR(val, reg);
> > ++ lpss_ssp_cs_control(drv_data, false);
> > + }
> > +
> > +-static int pxa25x_ssp_comp(struct driver_data *drv_data)
> > +-{
> > +- if (drv_data->ssp_type == PXA25x_SSP)
> > +- return 1;
> > +- if (drv_data->ssp_type == CE4100_SSP)
> > +- return 1;
> > +- return 0;
> > +-}
> > +-
> > +-static int flush(struct driver_data *drv_data)
> > ++int pxa2xx_spi_flush(struct driver_data *drv_data)
> > + {
> > + unsigned long limit = loops_per_jiffy << 1;
> > +
> > +@@ -354,7 +337,7 @@ static int u32_reader(struct driver_data *drv_data)
> > + return drv_data->rx == drv_data->rx_end;
> > + }
> > +
> > +-static void *next_transfer(struct driver_data *drv_data)
> > ++void *pxa2xx_spi_next_transfer(struct driver_data *drv_data)
> > + {
> > + struct spi_message *msg = drv_data->cur_msg;
> > + struct spi_transfer *trans = drv_data->cur_transfer;
> > +@@ -370,89 +353,15 @@ static void *next_transfer(struct driver_data
> *drv_data)
> > + return DONE_STATE;
> > + }
> > +
> > +-static int map_dma_buffers(struct driver_data *drv_data)
> > +-{
> > +- struct spi_message *msg = drv_data->cur_msg;
> > +- struct device *dev = &msg->spi->dev;
> > +-
> > +- if (!drv_data->cur_chip->enable_dma)
> > +- return 0;
> > +-
> > +- if (msg->is_dma_mapped)
> > +- return drv_data->rx_dma && drv_data->tx_dma;
> > +-
> > +- if (!IS_DMA_ALIGNED(drv_data->rx)
> || !IS_DMA_ALIGNED(drv_data->tx))
> > +- return 0;
> > +-
> > +- /* Modify setup if rx buffer is null */
> > +- if (drv_data->rx == NULL) {
> > +- *drv_data->null_dma_buf = 0;
> > +- drv_data->rx = drv_data->null_dma_buf;
> > +- drv_data->rx_map_len = 4;
> > +- } else
> > +- drv_data->rx_map_len = drv_data->len;
> > +-
> > +-
> > +- /* Modify setup if tx buffer is null */
> > +- if (drv_data->tx == NULL) {
> > +- *drv_data->null_dma_buf = 0;
> > +- drv_data->tx = drv_data->null_dma_buf;
> > +- drv_data->tx_map_len = 4;
> > +- } else
> > +- drv_data->tx_map_len = drv_data->len;
> > +-
> > +- /* Stream map the tx buffer. Always do DMA_TO_DEVICE first
> > +- * so we flush the cache *before* invalidating it, in case
> > +- * the tx and rx buffers overlap.
> > +- */
> > +- drv_data->tx_dma = dma_map_single(dev, drv_data->tx,
> > +- drv_data->tx_map_len,
> DMA_TO_DEVICE);
> > +- if (dma_mapping_error(dev, drv_data->tx_dma))
> > +- return 0;
> > +-
> > +- /* Stream map the rx buffer */
> > +- drv_data->rx_dma = dma_map_single(dev, drv_data->rx,
> > +- drv_data->rx_map_len,
> DMA_FROM_DEVICE);
> > +- if (dma_mapping_error(dev, drv_data->rx_dma)) {
> > +- dma_unmap_single(dev, drv_data->tx_dma,
> > +- drv_data->tx_map_len,
> DMA_TO_DEVICE);
> > +- return 0;
> > +- }
> > +-
> > +- return 1;
> > +-}
> > +-
> > +-static void unmap_dma_buffers(struct driver_data *drv_data)
> > +-{
> > +- struct device *dev;
> > +-
> > +- if (!drv_data->dma_mapped)
> > +- return;
> > +-
> > +- if (!drv_data->cur_msg->is_dma_mapped) {
> > +- dev = &drv_data->cur_msg->spi->dev;
> > +- dma_unmap_single(dev, drv_data->rx_dma,
> > +- drv_data->rx_map_len,
> DMA_FROM_DEVICE);
> > +- dma_unmap_single(dev, drv_data->tx_dma,
> > +- drv_data->tx_map_len,
> DMA_TO_DEVICE);
> > +- }
> > +-
> > +- drv_data->dma_mapped = 0;
> > +-}
> > +-
> > + /* caller already set message->status; dma and pio irqs are blocked */
> > + static void giveback(struct driver_data *drv_data)
> > + {
> > + struct spi_transfer* last_transfer;
> > +- unsigned long flags;
> > + struct spi_message *msg;
> > +
> > +- spin_lock_irqsave(&drv_data->lock, flags);
> > + msg = drv_data->cur_msg;
> > + drv_data->cur_msg = NULL;
> > + drv_data->cur_transfer = NULL;
> > +- queue_work(drv_data->workqueue, &drv_data->pump_messages);
> > +- spin_unlock_irqrestore(&drv_data->lock, flags);
> > +
> > + last_transfer = list_entry(msg->transfers.prev,
> > + struct spi_transfer,
> > +@@ -481,13 +390,7 @@ static void giveback(struct driver_data *drv_data)
> > + */
> > +
> > + /* get a pointer to the next message, if any */
> > +- spin_lock_irqsave(&drv_data->lock, flags);
> > +- if (list_empty(&drv_data->queue))
> > +- next_msg = NULL;
> > +- else
> > +- next_msg = list_entry(drv_data->queue.next,
> > +- struct spi_message, queue);
> > +- spin_unlock_irqrestore(&drv_data->lock, flags);
> > ++ next_msg = spi_get_next_queued_message(drv_data-
> >master);
> > +
> > + /* see if the next and current messages point
> > + * to the same chip
> > +@@ -498,168 +401,10 @@ static void giveback(struct driver_data
> *drv_data)
> > + cs_deassert(drv_data);
> > + }
> > +
> > +- msg->state = NULL;
> > +- if (msg->complete)
> > +- msg->complete(msg->context);
> > +-
> > ++ spi_finalize_current_message(drv_data->master);
> > + drv_data->cur_chip = NULL;
> > + }
> > +
> > +-static int wait_ssp_rx_stall(void const __iomem *ioaddr)
> > +-{
> > +- unsigned long limit = loops_per_jiffy << 1;
> > +-
> > +- while ((read_SSSR(ioaddr) & SSSR_BSY) && --limit)
> > +- cpu_relax();
> > +-
> > +- return limit;
> > +-}
> > +-
> > +-static int wait_dma_channel_stop(int channel)
> > +-{
> > +- unsigned long limit = loops_per_jiffy << 1;
> > +-
> > +- while (!(DCSR(channel) & DCSR_STOPSTATE) && --limit)
> > +- cpu_relax();
> > +-
> > +- return limit;
> > +-}
> > +-
> > +-static void dma_error_stop(struct driver_data *drv_data, const char
> *msg)
> > +-{
> > +- void __iomem *reg = drv_data->ioaddr;
> > +-
> > +- /* Stop and reset */
> > +- DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
> > +- DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
> > +- write_SSSR_CS(drv_data, drv_data->clear_sr);
> > +- write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
> > +- if (!pxa25x_ssp_comp(drv_data))
> > +- write_SSTO(0, reg);
> > +- flush(drv_data);
> > +- write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
> > +-
> > +- unmap_dma_buffers(drv_data);
> > +-
> > +- dev_err(&drv_data->pdev->dev, "%s\n", msg);
> > +-
> > +- drv_data->cur_msg->state = ERROR_STATE;
> > +- tasklet_schedule(&drv_data->pump_transfers);
> > +-}
> > +-
> > +-static void dma_transfer_complete(struct driver_data *drv_data)
> > +-{
> > +- void __iomem *reg = drv_data->ioaddr;
> > +- struct spi_message *msg = drv_data->cur_msg;
> > +-
> > +- /* Clear and disable interrupts on SSP and DMA channels*/
> > +- write_SSCR1(read_SSCR1(reg) & ~drv_data->dma_cr1, reg);
> > +- write_SSSR_CS(drv_data, drv_data->clear_sr);
> > +- DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
> > +- DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
> > +-
> > +- if (wait_dma_channel_stop(drv_data->rx_channel) == 0)
> > +- dev_err(&drv_data->pdev->dev,
> > +- "dma_handler: dma rx channel stop failed\n");
> > +-
> > +- if (wait_ssp_rx_stall(drv_data->ioaddr) == 0)
> > +- dev_err(&drv_data->pdev->dev,
> > +- "dma_transfer: ssp rx stall failed\n");
> > +-
> > +- unmap_dma_buffers(drv_data);
> > +-
> > +- /* update the buffer pointer for the amount completed in dma */
> > +- drv_data->rx += drv_data->len -
> > +- (DCMD(drv_data->rx_channel) & DCMD_LENGTH);
> > +-
> > +- /* read trailing data from fifo, it does not matter how many
> > +- * bytes are in the fifo just read until buffer is full
> > +- * or fifo is empty, which ever occurs first */
> > +- drv_data->read(drv_data);
> > +-
> > +- /* return count of what was actually read */
> > +- msg->actual_length += drv_data->len -
> > +- (drv_data->rx_end - drv_data->rx);
> > +-
> > +- /* Transfer delays and chip select release are
> > +- * handled in pump_transfers or giveback
> > +- */
> > +-
> > +- /* Move to next transfer */
> > +- msg->state = next_transfer(drv_data);
> > +-
> > +- /* Schedule transfer tasklet */
> > +- tasklet_schedule(&drv_data->pump_transfers);
> > +-}
> > +-
> > +-static void dma_handler(int channel, void *data)
> > +-{
> > +- struct driver_data *drv_data = data;
> > +- u32 irq_status = DCSR(channel) & DMA_INT_MASK;
> > +-
> > +- if (irq_status & DCSR_BUSERR) {
> > +-
> > +- if (channel == drv_data->tx_channel)
> > +- dma_error_stop(drv_data,
> > +- "dma_handler: "
> > +- "bad bus address on tx channel");
> > +- else
> > +- dma_error_stop(drv_data,
> > +- "dma_handler: "
> > +- "bad bus address on rx channel");
> > +- return;
> > +- }
> > +-
> > +- /* PXA255x_SSP has no timeout interrupt, wait for tailing bytes */
> > +- if ((channel == drv_data->tx_channel)
> > +- && (irq_status & DCSR_ENDINTR)
> > +- && (drv_data->ssp_type == PXA25x_SSP)) {
> > +-
> > +- /* Wait for rx to stall */
> > +- if (wait_ssp_rx_stall(drv_data->ioaddr) == 0)
> > +- dev_err(&drv_data->pdev->dev,
> > +- "dma_handler: ssp rx stall failed\n");
> > +-
> > +- /* finish this transfer, start the next */
> > +- dma_transfer_complete(drv_data);
> > +- }
> > +-}
> > +-
> > +-static irqreturn_t dma_transfer(struct driver_data *drv_data)
> > +-{
> > +- u32 irq_status;
> > +- void __iomem *reg = drv_data->ioaddr;
> > +-
> > +- irq_status = read_SSSR(reg) & drv_data->mask_sr;
> > +- if (irq_status & SSSR_ROR) {
> > +- dma_error_stop(drv_data, "dma_transfer: fifo overrun");
> > +- return IRQ_HANDLED;
> > +- }
> > +-
> > +- /* Check for false positive timeout */
> > +- if ((irq_status & SSSR_TINT)
> > +- && (DCSR(drv_data->tx_channel) & DCSR_RUN)) {
> > +- write_SSSR(SSSR_TINT, reg);
> > +- return IRQ_HANDLED;
> > +- }
> > +-
> > +- if (irq_status & SSSR_TINT || drv_data->rx == drv_data->rx_end) {
> > +-
> > +- /* Clear and disable timeout interrupt, do the rest in
> > +- * dma_transfer_complete */
> > +- if (!pxa25x_ssp_comp(drv_data))
> > +- write_SSTO(0, reg);
> > +-
> > +- /* finish this transfer, start the next */
> > +- dma_transfer_complete(drv_data);
> > +-
> > +- return IRQ_HANDLED;
> > +- }
> > +-
> > +- /* Opps problem detected */
> > +- return IRQ_NONE;
> > +-}
> > +-
> > + static void reset_sccr1(struct driver_data *drv_data)
> > + {
> > + void __iomem *reg = drv_data->ioaddr;
> > +@@ -681,7 +426,7 @@ static void int_error_stop(struct driver_data
> *drv_data, const char* msg)
> > + reset_sccr1(drv_data);
> > + if (!pxa25x_ssp_comp(drv_data))
> > + write_SSTO(0, reg);
> > +- flush(drv_data);
> > ++ pxa2xx_spi_flush(drv_data);
> > + write_SSCR0(read_SSCR0(reg) & ~SSCR0_SSE, reg);
> > +
> > + dev_err(&drv_data->pdev->dev, "%s\n", msg);
> > +@@ -709,7 +454,7 @@ static void int_transfer_complete(struct
> driver_data *drv_data)
> > + */
> > +
> > + /* Move to next transfer */
> > +- drv_data->cur_msg->state = next_transfer(drv_data);
> > ++ drv_data->cur_msg->state = pxa2xx_spi_next_transfer(drv_data);
> > +
> > + /* Schedule transfer tasklet */
> > + tasklet_schedule(&drv_data->pump_transfers);
> > +@@ -789,10 +534,20 @@ static irqreturn_t ssp_int(int irq, void *dev_id)
> > + {
> > + struct driver_data *drv_data = dev_id;
> > + void __iomem *reg = drv_data->ioaddr;
> > +- u32 sccr1_reg = read_SSCR1(reg);
> > ++ u32 sccr1_reg;
> > + u32 mask = drv_data->mask_sr;
> > + u32 status;
> > +
> > ++ /*
> > ++ * The IRQ might be shared with other peripherals so we must first
> > ++ * check that are we RPM suspended or not. If we are we assume
> that
> > ++ * the IRQ was not for us (we shouldn't be RPM suspended when the
> > ++ * interrupt is enabled).
> > ++ */
> > ++ if (pm_runtime_suspended(&drv_data->pdev->dev))
> > ++ return IRQ_NONE;
> > ++
> > ++ sccr1_reg = read_SSCR1(reg);
> > + status = read_SSSR(reg);
> > +
> > + /* Ignore possible writes if we don't need to write */
> > +@@ -820,106 +575,12 @@ static irqreturn_t ssp_int(int irq, void *dev_id)
> > + return drv_data->transfer_handler(drv_data);
> > + }
> > +
> > +-static int set_dma_burst_and_threshold(struct chip_data *chip,
> > +- struct spi_device *spi,
> > +- u8 bits_per_word, u32 *burst_code,
> > +- u32 *threshold)
> > ++static unsigned int ssp_get_clk_div(struct driver_data *drv_data, int rate)
> > + {
> > +- struct pxa2xx_spi_chip *chip_info =
> > +- (struct pxa2xx_spi_chip *)spi->controller_data;
> > +- int bytes_per_word;
> > +- int burst_bytes;
> > +- int thresh_words;
> > +- int req_burst_size;
> > +- int retval = 0;
> > +-
> > +- /* Set the threshold (in registers) to equal the same amount of data
> > +- * as represented by burst size (in bytes). The computation below
> > +- * is (burst_size rounded up to nearest 8 byte, word or long word)
> > +- * divided by (bytes/register); the tx threshold is the inverse of
> > +- * the rx, so that there will always be enough data in the rx fifo
> > +- * to satisfy a burst, and there will always be enough space in the
> > +- * tx fifo to accept a burst (a tx burst will overwrite the fifo if
> > +- * there is not enough space), there must always remain enough
> empty
> > +- * space in the rx fifo for any data loaded to the tx fifo.
> > +- * Whenever burst_size (in bytes) equals bits/word, the fifo
> threshold
> > +- * will be 8, or half the fifo;
> > +- * The threshold can only be set to 2, 4 or 8, but not 16, because
> > +- * to burst 16 to the tx fifo, the fifo would have to be empty;
> > +- * however, the minimum fifo trigger level is 1, and the tx will
> > +- * request service when the fifo is at this level, with only 15 spaces.
> > +- */
> > +-
> > +- /* find bytes/word */
> > +- if (bits_per_word <= 8)
> > +- bytes_per_word = 1;
> > +- else if (bits_per_word <= 16)
> > +- bytes_per_word = 2;
> > +- else
> > +- bytes_per_word = 4;
> > +-
> > +- /* use struct pxa2xx_spi_chip->dma_burst_size if available */
> > +- if (chip_info)
> > +- req_burst_size = chip_info->dma_burst_size;
> > +- else {
> > +- switch (chip->dma_burst_size) {
> > +- default:
> > +- /* if the default burst size is not set,
> > +- * do it now */
> > +- chip->dma_burst_size = DCMD_BURST8;
> > +- case DCMD_BURST8:
> > +- req_burst_size = 8;
> > +- break;
> > +- case DCMD_BURST16:
> > +- req_burst_size = 16;
> > +- break;
> > +- case DCMD_BURST32:
> > +- req_burst_size = 32;
> > +- break;
> > +- }
> > +- }
> > +- if (req_burst_size <= 8) {
> > +- *burst_code = DCMD_BURST8;
> > +- burst_bytes = 8;
> > +- } else if (req_burst_size <= 16) {
> > +- if (bytes_per_word == 1) {
> > +- /* don't burst more than 1/2 the fifo */
> > +- *burst_code = DCMD_BURST8;
> > +- burst_bytes = 8;
> > +- retval = 1;
> > +- } else {
> > +- *burst_code = DCMD_BURST16;
> > +- burst_bytes = 16;
> > +- }
> > +- } else {
> > +- if (bytes_per_word == 1) {
> > +- /* don't burst more than 1/2 the fifo */
> > +- *burst_code = DCMD_BURST8;
> > +- burst_bytes = 8;
> > +- retval = 1;
> > +- } else if (bytes_per_word == 2) {
> > +- /* don't burst more than 1/2 the fifo */
> > +- *burst_code = DCMD_BURST16;
> > +- burst_bytes = 16;
> > +- retval = 1;
> > +- } else {
> > +- *burst_code = DCMD_BURST32;
> > +- burst_bytes = 32;
> > +- }
> > +- }
> > +-
> > +- thresh_words = burst_bytes / bytes_per_word;
> > ++ unsigned long ssp_clk = drv_data->max_clk_rate;
> > ++ const struct ssp_device *ssp = drv_data->ssp;
> > +
> > +- /* thresh_words will be between 2 and 8 */
> > +- *threshold = (SSCR1_RxTresh(thresh_words) & SSCR1_RFT)
> > +- | (SSCR1_TxTresh(16-thresh_words) & SSCR1_TFT);
> > +-
> > +- return retval;
> > +-}
> > +-
> > +-static unsigned int ssp_get_clk_div(struct ssp_device *ssp, int rate)
> > +-{
> > +- unsigned long ssp_clk = clk_get_rate(ssp->clk);
> > ++ rate = min_t(int, ssp_clk, rate);
> > +
> > + if (ssp->type == PXA25x_SSP || ssp->type == CE4100_SSP)
> > + return ((ssp_clk / (2 * rate) - 1) & 0xff) << 8;
> > +@@ -934,7 +595,6 @@ static void pump_transfers(unsigned long data)
> > + struct spi_transfer *transfer = NULL;
> > + struct spi_transfer *previous = NULL;
> > + struct chip_data *chip = NULL;
> > +- struct ssp_device *ssp = drv_data->ssp;
> > + void __iomem *reg = drv_data->ioaddr;
> > + u32 clk_div = 0;
> > + u8 bits = 0;
> > +@@ -976,8 +636,8 @@ static void pump_transfers(unsigned long data)
> > + cs_deassert(drv_data);
> > + }
> > +
> > +- /* Check for transfers that need multiple DMA segments */
> > +- if (transfer->len > MAX_DMA_LEN && chip->enable_dma) {
> > ++ /* Check if we can DMA this transfer */
> > ++ if (!pxa2xx_spi_dma_is_possible(transfer->len) && chip-
> >enable_dma) {
> > +
> > + /* reject already-mapped transfers; PIO won't always work
> */
> > + if (message->is_dma_mapped
> > +@@ -1000,21 +660,20 @@ static void pump_transfers(unsigned long data)
> > + }
> > +
> > + /* Setup the transfer state based on the type of transfer */
> > +- if (flush(drv_data) == 0) {
> > ++ if (pxa2xx_spi_flush(drv_data) == 0) {
> > + dev_err(&drv_data->pdev->dev, "pump_transfers: flush
> failed\n");
> > + message->status = -EIO;
> > + giveback(drv_data);
> > + return;
> > + }
> > + drv_data->n_bytes = chip->n_bytes;
> > +- drv_data->dma_width = chip->dma_width;
> > + drv_data->tx = (void *)transfer->tx_buf;
> > + drv_data->tx_end = drv_data->tx + transfer->len;
> > + drv_data->rx = transfer->rx_buf;
> > + drv_data->rx_end = drv_data->rx + transfer->len;
> > + drv_data->rx_dma = transfer->rx_dma;
> > + drv_data->tx_dma = transfer->tx_dma;
> > +- drv_data->len = transfer->len & DCMD_LENGTH;
> > ++ drv_data->len = transfer->len;
> > + drv_data->write = drv_data->tx ? chip->write : null_writer;
> > + drv_data->read = drv_data->rx ? chip->read : null_reader;
> > +
> > +@@ -1031,25 +690,22 @@ static void pump_transfers(unsigned long data)
> > + if (transfer->bits_per_word)
> > + bits = transfer->bits_per_word;
> > +
> > +- clk_div = ssp_get_clk_div(ssp, speed);
> > ++ clk_div = ssp_get_clk_div(drv_data, speed);
> > +
> > + if (bits <= 8) {
> > + drv_data->n_bytes = 1;
> > +- drv_data->dma_width = DCMD_WIDTH1;
> > + drv_data->read = drv_data->read != null_reader ?
> > + u8_reader : null_reader;
> > + drv_data->write = drv_data->write != null_writer ?
> > + u8_writer : null_writer;
> > + } else if (bits <= 16) {
> > + drv_data->n_bytes = 2;
> > +- drv_data->dma_width = DCMD_WIDTH2;
> > + drv_data->read = drv_data->read != null_reader ?
> > + u16_reader : null_reader;
> > + drv_data->write = drv_data->write != null_writer ?
> > + u16_writer : null_writer;
> > + } else if (bits <= 32) {
> > + drv_data->n_bytes = 4;
> > +- drv_data->dma_width = DCMD_WIDTH4;
> > + drv_data->read = drv_data->read != null_reader ?
> > + u32_reader : null_reader;
> > + drv_data->write = drv_data->write != null_writer ?
> > +@@ -1058,7 +714,8 @@ static void pump_transfers(unsigned long data)
> > + /* if bits/word is changed in dma mode, then must check the
> > + * thresholds and burst also */
> > + if (chip->enable_dma) {
> > +- if (set_dma_burst_and_threshold(chip, message-
> >spi,
> > ++ if (pxa2xx_spi_set_dma_burst_and_threshold(chip,
> > ++ message->spi,
> > + bits, &dma_burst,
> > + &dma_thresh))
> > + if (printk_ratelimit())
> > +@@ -1077,70 +734,21 @@ static void pump_transfers(unsigned long data)
> > +
> > + message->state = RUNNING_STATE;
> > +
> > +- /* Try to map dma buffer and do a dma transfer if successful, but
> > +- * only if the length is non-zero and less than MAX_DMA_LEN.
> > +- *
> > +- * Zero-length non-descriptor DMA is illegal on PXA2xx; force use
> > +- * of PIO instead. Care is needed above because the transfer may
> > +- * have have been passed with buffers that are already dma mapped.
> > +- * A zero-length transfer in PIO mode will not try to write/read
> > +- * to/from the buffers
> > +- *
> > +- * REVISIT large transfers are exactly where we most want to be
> > +- * using DMA. If this happens much, split those transfers into
> > +- * multiple DMA segments rather than forcing PIO.
> > +- */
> > + drv_data->dma_mapped = 0;
> > +- if (drv_data->len > 0 && drv_data->len <= MAX_DMA_LEN)
> > +- drv_data->dma_mapped = map_dma_buffers(drv_data);
> > ++ if (pxa2xx_spi_dma_is_possible(drv_data->len))
> > ++ drv_data->dma_mapped =
> pxa2xx_spi_map_dma_buffers(drv_data);
> > + if (drv_data->dma_mapped) {
> > +
> > + /* Ensure we have the correct interrupt handler */
> > +- drv_data->transfer_handler = dma_transfer;
> > +-
> > +- /* Setup rx DMA Channel */
> > +- DCSR(drv_data->rx_channel) = RESET_DMA_CHANNEL;
> > +- DSADR(drv_data->rx_channel) = drv_data->ssdr_physical;
> > +- DTADR(drv_data->rx_channel) = drv_data->rx_dma;
> > +- if (drv_data->rx == drv_data->null_dma_buf)
> > +- /* No target address increment */
> > +- DCMD(drv_data->rx_channel) = DCMD_FLOWSRC
> > +- | drv_data-
> >dma_width
> > +- | dma_burst
> > +- | drv_data->len;
> > +- else
> > +- DCMD(drv_data->rx_channel) =
> DCMD_INCTRGADDR
> > +- | DCMD_FLOWSRC
> > +- | drv_data-
> >dma_width
> > +- | dma_burst
> > +- | drv_data->len;
> > +-
> > +- /* Setup tx DMA Channel */
> > +- DCSR(drv_data->tx_channel) = RESET_DMA_CHANNEL;
> > +- DSADR(drv_data->tx_channel) = drv_data->tx_dma;
> > +- DTADR(drv_data->tx_channel) = drv_data->ssdr_physical;
> > +- if (drv_data->tx == drv_data->null_dma_buf)
> > +- /* No source address increment */
> > +- DCMD(drv_data->tx_channel) = DCMD_FLOWTRG
> > +- | drv_data-
> >dma_width
> > +- | dma_burst
> > +- | drv_data->len;
> > +- else
> > +- DCMD(drv_data->tx_channel) = DCMD_INCSRCADDR
> > +- | DCMD_FLOWTRG
> > +- | drv_data-
> >dma_width
> > +- | dma_burst
> > +- | drv_data->len;
> > +-
> > +- /* Enable dma end irqs on SSP to detect end of transfer */
> > +- if (drv_data->ssp_type == PXA25x_SSP)
> > +- DCMD(drv_data->tx_channel) |= DCMD_ENDIRQEN;
> > ++ drv_data->transfer_handler = pxa2xx_spi_dma_transfer;
> > ++
> > ++ pxa2xx_spi_dma_prepare(drv_data, dma_burst);
> > +
> > + /* Clear status and start DMA engine */
> > + cr1 = chip->cr1 | dma_thresh | drv_data->dma_cr1;
> > + write_SSSR(drv_data->clear_sr, reg);
> > +- DCSR(drv_data->rx_channel) |= DCSR_RUN;
> > +- DCSR(drv_data->tx_channel) |= DCSR_RUN;
> > ++
> > ++ pxa2xx_spi_dma_start(drv_data);
> > + } else {
> > + /* Ensure we have the correct interrupt handler */
> > + drv_data->transfer_handler = interrupt_transfer;
> > +@@ -1150,6 +758,13 @@ static void pump_transfers(unsigned long data)
> > + write_SSSR_CS(drv_data, drv_data->clear_sr);
> > + }
> > +
> > ++ if (is_lpss_ssp(drv_data)) {
> > ++ if ((read_SSIRF(reg) & 0xff) != chip->lpss_rx_threshold)
> > ++ write_SSIRF(chip->lpss_rx_threshold, reg);
> > ++ if ((read_SSITF(reg) & 0xffff) != chip->lpss_tx_threshold)
> > ++ write_SSITF(chip->lpss_tx_threshold, reg);
> > ++ }
> > ++
> > + /* see if we need to reload the config registers */
> > + if ((read_SSCR0(reg) != cr0)
> > + || (read_SSCR1(reg) & SSCR1_CHANGE_MASK) !=
> > +@@ -1176,31 +791,12 @@ static void pump_transfers(unsigned long data)
> > + write_SSCR1(cr1, reg);
> > + }
> > +
> > +-static void pump_messages(struct work_struct *work)
> > ++static int pxa2xx_spi_transfer_one_message(struct spi_master *master,
> > ++ struct spi_message *msg)
> > + {
> > +- struct driver_data *drv_data =
> > +- container_of(work, struct driver_data, pump_messages);
> > +- unsigned long flags;
> > +-
> > +- /* Lock queue and check for queue work */
> > +- spin_lock_irqsave(&drv_data->lock, flags);
> > +- if (list_empty(&drv_data->queue) || drv_data->run ==
> QUEUE_STOPPED) {
> > +- drv_data->busy = 0;
> > +- spin_unlock_irqrestore(&drv_data->lock, flags);
> > +- return;
> > +- }
> > +-
> > +- /* Make sure we are not already running a message */
> > +- if (drv_data->cur_msg) {
> > +- spin_unlock_irqrestore(&drv_data->lock, flags);
> > +- return;
> > +- }
> > +-
> > +- /* Extract head of queue */
> > +- drv_data->cur_msg = list_entry(drv_data->queue.next,
> > +- struct spi_message, queue);
> > +- list_del_init(&drv_data->cur_msg->queue);
> > ++ struct driver_data *drv_data = spi_master_get_devdata(master);
> > +
> > ++ drv_data->cur_msg = msg;
> > + /* Initial message state*/
> > + drv_data->cur_msg->state = START_STATE;
> > + drv_data->cur_transfer = list_entry(drv_data->cur_msg-
> >transfers.next,
> > +@@ -1213,34 +809,27 @@ static void pump_messages(struct work_struct
> *work)
> > +
> > + /* Mark as busy and launch transfers */
> > + tasklet_schedule(&drv_data->pump_transfers);
> > +-
> > +- drv_data->busy = 1;
> > +- spin_unlock_irqrestore(&drv_data->lock, flags);
> > ++ return 0;
> > + }
> > +
> > +-static int transfer(struct spi_device *spi, struct spi_message *msg)
> > ++static int pxa2xx_spi_prepare_transfer(struct spi_master *master)
> > + {
> > +- struct driver_data *drv_data = spi_master_get_devdata(spi-
> >master);
> > +- unsigned long flags;
> > +-
> > +- spin_lock_irqsave(&drv_data->lock, flags);
> > +-
> > +- if (drv_data->run == QUEUE_STOPPED) {
> > +- spin_unlock_irqrestore(&drv_data->lock, flags);
> > +- return -ESHUTDOWN;
> > +- }
> > +-
> > +- msg->actual_length = 0;
> > +- msg->status = -EINPROGRESS;
> > +- msg->state = START_STATE;
> > ++ struct driver_data *drv_data = spi_master_get_devdata(master);
> > +
> > +- list_add_tail(&msg->queue, &drv_data->queue);
> > ++ pm_runtime_get_sync(&drv_data->pdev->dev);
> > ++ return 0;
> > ++}
> > +
> > +- if (drv_data->run == QUEUE_RUNNING && !drv_data->busy)
> > +- queue_work(drv_data->workqueue, &drv_data-
> >pump_messages);
> > ++static int pxa2xx_spi_unprepare_transfer(struct spi_master *master)
> > ++{
> > ++ struct driver_data *drv_data = spi_master_get_devdata(master);
> > +
> > +- spin_unlock_irqrestore(&drv_data->lock, flags);
> > ++ /* Disable the SSP now */
> > ++ write_SSCR0(read_SSCR0(drv_data->ioaddr) & ~SSCR0_SSE,
> > ++ drv_data->ioaddr);
> > +
> > ++ pm_runtime_mark_last_busy(&drv_data->pdev->dev);
> > ++ pm_runtime_put_autosuspend(&drv_data->pdev->dev);
> > + return 0;
> > + }
> > +
> > +@@ -1287,10 +876,18 @@ static int setup(struct spi_device *spi)
> > + struct pxa2xx_spi_chip *chip_info = NULL;
> > + struct chip_data *chip;
> > + struct driver_data *drv_data = spi_master_get_devdata(spi-
> >master);
> > +- struct ssp_device *ssp = drv_data->ssp;
> > + unsigned int clk_div;
> > +- uint tx_thres = TX_THRESH_DFLT;
> > +- uint rx_thres = RX_THRESH_DFLT;
> > ++ uint tx_thres, tx_hi_thres, rx_thres;
> > ++
> > ++ if (is_lpss_ssp(drv_data)) {
> > ++ tx_thres = LPSS_TX_LOTHRESH_DFLT;
> > ++ tx_hi_thres = LPSS_TX_HITHRESH_DFLT;
> > ++ rx_thres = LPSS_RX_THRESH_DFLT;
> > ++ } else {
> > ++ tx_thres = TX_THRESH_DFLT;
> > ++ tx_hi_thres = 0;
> > ++ rx_thres = RX_THRESH_DFLT;
> > ++ }
> > +
> > + if (!pxa25x_ssp_comp(drv_data)
> > + && (spi->bits_per_word < 4 || spi->bits_per_word > 32)) {
> > +@@ -1330,8 +927,6 @@ static int setup(struct spi_device *spi)
> > + chip->gpio_cs = -1;
> > + chip->enable_dma = 0;
> > + chip->timeout = TIMOUT_DFLT;
> > +- chip->dma_burst_size = drv_data->master_info-
> >enable_dma ?
> > +- DCMD_BURST8 : 0;
> > + }
> > +
> > + /* protocol drivers may change the chip settings, so...
> > +@@ -1345,23 +940,37 @@ static int setup(struct spi_device *spi)
> > + chip->timeout = chip_info->timeout;
> > + if (chip_info->tx_threshold)
> > + tx_thres = chip_info->tx_threshold;
> > ++ if (chip_info->tx_hi_threshold)
> > ++ tx_hi_thres = chip_info->tx_hi_threshold;
> > + if (chip_info->rx_threshold)
> > + rx_thres = chip_info->rx_threshold;
> > + chip->enable_dma = drv_data->master_info->enable_dma;
> > + chip->dma_threshold = 0;
> > + if (chip_info->enable_loopback)
> > + chip->cr1 = SSCR1_LBM;
> > ++ } else if (ACPI_HANDLE(&spi->dev)) {
> > ++ /*
> > ++ * Slave devices enumerated from ACPI namespace don't
> > ++ * usually have chip_info but we still might want to use
> > ++ * DMA with them.
> > ++ */
> > ++ chip->enable_dma = drv_data->master_info->enable_dma;
> > + }
> > +
> > + chip->threshold = (SSCR1_RxTresh(rx_thres) & SSCR1_RFT) |
> > + (SSCR1_TxTresh(tx_thres) & SSCR1_TFT);
> > +
> > ++ chip->lpss_rx_threshold = SSIRF_RxThresh(rx_thres);
> > ++ chip->lpss_tx_threshold = SSITF_TxLoThresh(tx_thres)
> > ++ | SSITF_TxHiThresh(tx_hi_thres);
> > ++
> > + /* set dma burst and threshold outside of chip_info path so that if
> > + * chip_info goes away after setting chip->enable_dma, the
> > + * burst and threshold can still respond to changes in bits_per_word
> */
> > + if (chip->enable_dma) {
> > + /* set up legal burst and threshold for dma */
> > +- if (set_dma_burst_and_threshold(chip, spi, spi-
> >bits_per_word,
> > ++ if (pxa2xx_spi_set_dma_burst_and_threshold(chip, spi,
> > ++ spi->bits_per_word,
> > + &chip->dma_burst_size,
> > + &chip->dma_threshold)) {
> > + dev_warn(&spi->dev, "in setup: DMA burst size
> reduced "
> > +@@ -1369,7 +978,7 @@ static int setup(struct spi_device *spi)
> > + }
> > + }
> > +
> > +- clk_div = ssp_get_clk_div(ssp, spi->max_speed_hz);
> > ++ clk_div = ssp_get_clk_div(drv_data, spi->max_speed_hz);
> > + chip->speed_hz = spi->max_speed_hz;
> > +
> > + chip->cr0 = clk_div
> > +@@ -1382,32 +991,32 @@ static int setup(struct spi_device *spi)
> > + chip->cr1 |= (((spi->mode & SPI_CPHA) != 0) ? SSCR1_SPH : 0)
> > + | (((spi->mode & SPI_CPOL) != 0) ? SSCR1_SPO : 0);
> > +
> > ++ if (spi->mode & SPI_LOOP)
> > ++ chip->cr1 |= SSCR1_LBM;
> > ++
> > + /* NOTE: PXA25x_SSP _could_ use external clocking ... */
> > + if (!pxa25x_ssp_comp(drv_data))
> > + dev_dbg(&spi->dev, "%ld Hz actual, %s\n",
> > +- clk_get_rate(ssp->clk)
> > ++ drv_data->max_clk_rate
> > + / (1 + ((chip->cr0 & SSCR0_SCR(0xfff)) >> 8)),
> > + chip->enable_dma ? "DMA" : "PIO");
> > + else
> > + dev_dbg(&spi->dev, "%ld Hz actual, %s\n",
> > +- clk_get_rate(ssp->clk) / 2
> > ++ drv_data->max_clk_rate / 2
> > + / (1 + ((chip->cr0 & SSCR0_SCR(0x0ff)) >> 8)),
> > + chip->enable_dma ? "DMA" : "PIO");
> > +
> > + if (spi->bits_per_word <= 8) {
> > + chip->n_bytes = 1;
> > +- chip->dma_width = DCMD_WIDTH1;
> > + chip->read = u8_reader;
> > + chip->write = u8_writer;
> > + } else if (spi->bits_per_word <= 16) {
> > + chip->n_bytes = 2;
> > +- chip->dma_width = DCMD_WIDTH2;
> > + chip->read = u16_reader;
> > + chip->write = u16_writer;
> > + } else if (spi->bits_per_word <= 32) {
> > + chip->cr0 |= SSCR0_EDSS;
> > + chip->n_bytes = 4;
> > +- chip->dma_width = DCMD_WIDTH4;
> > + chip->read = u32_reader;
> > + chip->write = u32_writer;
> > + } else {
> > +@@ -1438,93 +1047,100 @@ static void cleanup(struct spi_device *spi)
> > + kfree(chip);
> > + }
> > +
> > +-static int init_queue(struct driver_data *drv_data)
> > ++#ifdef CONFIG_ACPI
> > ++static int pxa2xx_spi_acpi_add_dma(struct acpi_resource *res, void
> *data)
> > + {
> > +- INIT_LIST_HEAD(&drv_data->queue);
> > +- spin_lock_init(&drv_data->lock);
> > +-
> > +- drv_data->run = QUEUE_STOPPED;
> > +- drv_data->busy = 0;
> > +-
> > +- tasklet_init(&drv_data->pump_transfers,
> > +- pump_transfers, (unsigned long)drv_data);
> > +-
> > +- INIT_WORK(&drv_data->pump_messages, pump_messages);
> > +- drv_data->workqueue = create_singlethread_workqueue(
> > +- dev_name(drv_data->master->dev.parent));
> > +- if (drv_data->workqueue == NULL)
> > +- return -EBUSY;
> > ++ struct pxa2xx_spi_master *pdata = data;
> > ++
> > ++ if (res->type == ACPI_RESOURCE_TYPE_FIXED_DMA) {
> > ++ const struct acpi_resource_fixed_dma *dma;
> > ++
> > ++ dma = &res->data.fixed_dma;
> > ++ if (pdata->tx_slave_id < 0) {
> > ++ pdata->tx_slave_id = dma->request_lines;
> > ++ pdata->tx_chan_id = dma->channels;
> > ++ } else if (pdata->rx_slave_id < 0) {
> > ++ pdata->rx_slave_id = dma->request_lines;
> > ++ pdata->rx_chan_id = dma->channels;
> > ++ }
> > ++ }
> > +
> > +- return 0;
> > ++ /* Tell the ACPI core to skip this resource */
> > ++ return 1;
> > + }
> > +
> > +-static int start_queue(struct driver_data *drv_data)
> > ++static struct pxa2xx_spi_master *
> > ++pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
> > + {
> > +- unsigned long flags;
> > +-
> > +- spin_lock_irqsave(&drv_data->lock, flags);
> > +-
> > +- if (drv_data->run == QUEUE_RUNNING || drv_data->busy) {
> > +- spin_unlock_irqrestore(&drv_data->lock, flags);
> > +- return -EBUSY;
> > ++ struct pxa2xx_spi_master *pdata;
> > ++ struct list_head resource_list;
> > ++ struct acpi_device *adev;
> > ++ struct ssp_device *ssp;
> > ++ struct resource *res;
> > ++ int devid;
> > ++
> > ++ if (!ACPI_HANDLE(&pdev->dev) ||
> > ++ acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev))
> > ++ return NULL;
> > ++
> > ++ pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
> > ++ if (!pdata) {
> > ++ dev_err(&pdev->dev,
> > ++ "failed to allocate memory for platform data\n");
> > ++ return NULL;
> > + }
> > +
> > +- drv_data->run = QUEUE_RUNNING;
> > +- drv_data->cur_msg = NULL;
> > +- drv_data->cur_transfer = NULL;
> > +- drv_data->cur_chip = NULL;
> > +- spin_unlock_irqrestore(&drv_data->lock, flags);
> > +-
> > +- queue_work(drv_data->workqueue, &drv_data->pump_messages);
> > ++ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> > ++ if (!res)
> > ++ return NULL;
> > +
> > +- return 0;
> > +-}
> > ++ ssp = &pdata->ssp;
> > +
> > +-static int stop_queue(struct driver_data *drv_data)
> > +-{
> > +- unsigned long flags;
> > +- unsigned limit = 500;
> > +- int status = 0;
> > +-
> > +- spin_lock_irqsave(&drv_data->lock, flags);
> > +-
> > +- /* This is a bit lame, but is optimized for the common execution path.
> > +- * A wait_queue on the drv_data->busy could be used, but then the
> common
> > +- * execution path (pump_messages) would be required to call
> wake_up or
> > +- * friends on every SPI message. Do this instead */
> > +- drv_data->run = QUEUE_STOPPED;
> > +- while ((!list_empty(&drv_data->queue) || drv_data->busy) &&
> limit--) {
> > +- spin_unlock_irqrestore(&drv_data->lock, flags);
> > +- msleep(10);
> > +- spin_lock_irqsave(&drv_data->lock, flags);
> > ++ ssp->phys_base = res->start;
> > ++ ssp->mmio_base = devm_request_and_ioremap(&pdev->dev, res);
> > ++ if (!ssp->mmio_base) {
> > ++ dev_err(&pdev->dev, "failed to ioremap mmio_base\n");
> > ++ return NULL;
> > + }
> > +
> > +- if (!list_empty(&drv_data->queue) || drv_data->busy)
> > +- status = -EBUSY;
> > ++ ssp->clk = devm_clk_get(&pdev->dev, NULL);
> > ++ ssp->irq = platform_get_irq(pdev, 0);
> > ++ ssp->type = LPSS_SSP;
> > ++ ssp->pdev = pdev;
> > +
> > +- spin_unlock_irqrestore(&drv_data->lock, flags);
> > ++ ssp->port_id = -1;
> > ++ if (adev->pnp.unique_id && !kstrtoint(adev->pnp.unique_id, 0,
> &devid))
> > ++ ssp->port_id = devid;
> > +
> > +- return status;
> > +-}
> > ++ pdata->num_chipselect = 1;
> > ++ pdata->rx_slave_id = -1;
> > ++ pdata->tx_slave_id = -1;
> > +
> > +-static int destroy_queue(struct driver_data *drv_data)
> > +-{
> > +- int status;
> > ++ INIT_LIST_HEAD(&resource_list);
> > ++ acpi_dev_get_resources(adev, &resource_list,
> pxa2xx_spi_acpi_add_dma,
> > ++ pdata);
> > ++ acpi_dev_free_resource_list(&resource_list);
> > +
> > +- status = stop_queue(drv_data);
> > +- /* we are unloading the module or failing to load (only two calls
> > +- * to this routine), and neither call can handle a return value.
> > +- * However, destroy_workqueue calls flush_workqueue, and that
> will
> > +- * block until all work is done. If the reason that stop_queue
> > +- * timed out is that the work will never finish, then it does no
> > +- * good to call destroy_workqueue, so return anyway. */
> > +- if (status != 0)
> > +- return status;
> > ++ if (use_dma)
> > ++ pdata->enable_dma = pdata->rx_slave_id >= 0 && pdata-
> >tx_slave_id >= 0;
> > +
> > +- destroy_workqueue(drv_data->workqueue);
> > ++ return pdata;
> > ++}
> > +
> > +- return 0;
> > ++static struct acpi_device_id pxa2xx_spi_acpi_match[] = {
> > ++ { "INT33C0", 0 },
> > ++ { "INT33C1", 0 },
> > ++ { "80860F0E", 0 },
> > ++ { },
> > ++};
> > ++MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match);
> > ++#else
> > ++static inline struct pxa2xx_spi_master *
> > ++pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
> > ++{
> > ++ return NULL;
> > + }
> > ++#endif
> > +
> > + static int pxa2xx_spi_probe(struct platform_device *pdev)
> > + {
> > +@@ -1535,11 +1151,21 @@ static int pxa2xx_spi_probe(struct
> platform_device *pdev)
> > + struct ssp_device *ssp;
> > + int status;
> > +
> > +- platform_info = dev->platform_data;
> > ++ platform_info = dev_get_platdata(dev);
> > ++ if (!platform_info) {
> > ++ platform_info = pxa2xx_spi_acpi_get_pdata(pdev);
> > ++ if (!platform_info) {
> > ++ dev_err(&pdev->dev, "missing platform data\n");
> > ++ return -ENODEV;
> > ++ }
> > ++ }
> > +
> > + ssp = pxa_ssp_request(pdev->id, pdev->name);
> > +- if (ssp == NULL) {
> > +- dev_err(&pdev->dev, "failed to request SSP%d\n", pdev-
> >id);
> > ++ if (!ssp)
> > ++ ssp = &platform_info->ssp;
> > ++
> > ++ if (!ssp->mmio_base) {
> > ++ dev_err(&pdev->dev, "failed to get ssp\n");
> > + return -ENODEV;
> > + }
> > +
> > +@@ -1558,19 +1184,21 @@ static int pxa2xx_spi_probe(struct
> platform_device *pdev)
> > +
> > + master->dev.parent = &pdev->dev;
> > + master->dev.of_node = pdev->dev.of_node;
> > ++ ACPI_HANDLE_SET(&master->dev, ACPI_HANDLE(&pdev->dev));
> > + /* the spi->mode bits understood by this driver: */
> > +- master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
> > ++ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH |
> SPI_LOOP;
> > +
> > +- master->bus_num = pdev->id;
> > ++ master->bus_num = ssp->port_id;
> > + master->num_chipselect = platform_info->num_chipselect;
> > + master->dma_alignment = DMA_ALIGNMENT;
> > + master->cleanup = cleanup;
> > + master->setup = setup;
> > +- master->transfer = transfer;
> > ++ master->transfer_one_message =
> pxa2xx_spi_transfer_one_message;
> > ++ master->prepare_transfer_hardware =
> pxa2xx_spi_prepare_transfer;
> > ++ master->unprepare_transfer_hardware =
> pxa2xx_spi_unprepare_transfer;
> > +
> > + drv_data->ssp_type = ssp->type;
> > +- drv_data->null_dma_buf = (u32 *)ALIGN((u32)(drv_data +
> > +- sizeof(struct driver_data)), 8);
> > ++ drv_data->null_dma_buf = (u32 *)PTR_ALIGN(&drv_data[1],
> DMA_ALIGNMENT);
> > +
> > + drv_data->ioaddr = ssp->mmio_base;
> > + drv_data->ssdr_physical = ssp->phys_base + SSDR;
> > +@@ -1581,7 +1209,7 @@ static int pxa2xx_spi_probe(struct
> platform_device *pdev)
> > + drv_data->mask_sr = SSSR_RFS | SSSR_TFS | SSSR_ROR;
> > + } else {
> > + drv_data->int_cr1 = SSCR1_TIE | SSCR1_RIE | SSCR1_TINTE;
> > +- drv_data->dma_cr1 = SSCR1_TSRE | SSCR1_RSRE |
> SSCR1_TINTE;
> > ++ drv_data->dma_cr1 = DEFAULT_DMA_CR1;
> > + drv_data->clear_sr = SSSR_ROR | SSSR_TINT;
> > + drv_data->mask_sr = SSSR_TINT | SSSR_RFS | SSSR_TFS |
> SSSR_ROR;
> > + }
> > +@@ -1597,35 +1225,17 @@ static int pxa2xx_spi_probe(struct
> platform_device *pdev)
> > + drv_data->tx_channel = -1;
> > + drv_data->rx_channel = -1;
> > + if (platform_info->enable_dma) {
> > +-
> > +- /* Get two DMA channels (rx and tx) */
> > +- drv_data->rx_channel =
> pxa_request_dma("pxa2xx_spi_ssp_rx",
> > +- DMA_PRIO_HIGH,
> > +- dma_handler,
> > +- drv_data);
> > +- if (drv_data->rx_channel < 0) {
> > +- dev_err(dev, "problem (%d) requesting rx
> channel\n",
> > +- drv_data->rx_channel);
> > +- status = -ENODEV;
> > +- goto out_error_irq_alloc;
> > ++ status = pxa2xx_spi_dma_setup(drv_data);
> > ++ if (status) {
> > ++ dev_warn(dev, "failed to setup DMA, using PIO\n");
> > ++ platform_info->enable_dma = false;
> > + }
> > +- drv_data->tx_channel =
> pxa_request_dma("pxa2xx_spi_ssp_tx",
> > +- DMA_PRIO_MEDIUM,
> > +- dma_handler,
> > +- drv_data);
> > +- if (drv_data->tx_channel < 0) {
> > +- dev_err(dev, "problem (%d) requesting tx
> channel\n",
> > +- drv_data->tx_channel);
> > +- status = -ENODEV;
> > +- goto out_error_dma_alloc;
> > +- }
> > +-
> > +- DRCMR(ssp->drcmr_rx) = DRCMR_MAPVLD | drv_data-
> >rx_channel;
> > +- DRCMR(ssp->drcmr_tx) = DRCMR_MAPVLD | drv_data-
> >tx_channel;
> > + }
> > +
> > + /* Enable SOC clock */
> > +- clk_enable(ssp->clk);
> > ++ clk_prepare_enable(ssp->clk);
> > ++
> > ++ drv_data->max_clk_rate = clk_get_rate(ssp->clk);
> > +
> > + /* Load default SSP configuration */
> > + write_SSCR0(0, drv_data->ioaddr);
> > +@@ -1640,41 +1250,26 @@ static int pxa2xx_spi_probe(struct
> platform_device *pdev)
> > + write_SSTO(0, drv_data->ioaddr);
> > + write_SSPSP(0, drv_data->ioaddr);
> > +
> > +- /* Initial and start queue */
> > +- status = init_queue(drv_data);
> > +- if (status != 0) {
> > +- dev_err(&pdev->dev, "problem initializing queue\n");
> > +- goto out_error_clock_enabled;
> > +- }
> > +- status = start_queue(drv_data);
> > +- if (status != 0) {
> > +- dev_err(&pdev->dev, "problem starting queue\n");
> > +- goto out_error_clock_enabled;
> > +- }
> > ++ lpss_ssp_setup(drv_data);
> > ++
> > ++ tasklet_init(&drv_data->pump_transfers, pump_transfers,
> > ++ (unsigned long)drv_data);
> > +
> > + /* Register with the SPI framework */
> > + platform_set_drvdata(pdev, drv_data);
> > + status = spi_register_master(master);
> > + if (status != 0) {
> > + dev_err(&pdev->dev, "problem registering spi master\n");
> > +- goto out_error_queue_alloc;
> > ++ goto out_error_clock_enabled;
> > + }
> > +
> > +- return status;
> > ++ pm_runtime_forbid(&pdev->dev);
> > +
> > +-out_error_queue_alloc:
> > +- destroy_queue(drv_data);
> > ++ return status;
> > +
> > + out_error_clock_enabled:
> > +- clk_disable(ssp->clk);
> > +-
> > +-out_error_dma_alloc:
> > +- if (drv_data->tx_channel != -1)
> > +- pxa_free_dma(drv_data->tx_channel);
> > +- if (drv_data->rx_channel != -1)
> > +- pxa_free_dma(drv_data->rx_channel);
> > +-
> > +-out_error_irq_alloc:
> > ++ clk_disable_unprepare(ssp->clk);
> > ++ pxa2xx_spi_dma_release(drv_data);
> > + free_irq(ssp->irq, drv_data);
> > +
> > + out_error_master_alloc:
> > +@@ -1687,37 +1282,23 @@ static int pxa2xx_spi_remove(struct
> platform_device *pdev)
> > + {
> > + struct driver_data *drv_data = platform_get_drvdata(pdev);
> > + struct ssp_device *ssp;
> > +- int status = 0;
> > +
> > + if (!drv_data)
> > + return 0;
> > + ssp = drv_data->ssp;
> > +
> > +- /* Remove the queue */
> > +- status = destroy_queue(drv_data);
> > +- if (status != 0)
> > +- /* the kernel does not check the return status of this
> > +- * this routine (mod->exit, within the kernel). Therefore
> > +- * nothing is gained by returning from here, the module is
> > +- * going away regardless, and we should not leave any more
> > +- * resources allocated than necessary. We cannot free the
> > +- * message memory in drv_data->queue, but we can release
> the
> > +- * resources below. I think the kernel should honor -EBUSY
> > +- * returns but... */
> > +- dev_err(&pdev->dev, "pxa2xx_spi_remove: workqueue will
> not "
> > +- "complete, message memory not freed\n");
> > ++ pm_runtime_get_sync(&pdev->dev);
> > +
> > + /* Disable the SSP at the peripheral and SOC level */
> > + write_SSCR0(0, drv_data->ioaddr);
> > +- clk_disable(ssp->clk);
> > ++ clk_disable_unprepare(ssp->clk);
> > +
> > + /* Release DMA */
> > +- if (drv_data->master_info->enable_dma) {
> > +- DRCMR(ssp->drcmr_rx) = 0;
> > +- DRCMR(ssp->drcmr_tx) = 0;
> > +- pxa_free_dma(drv_data->tx_channel);
> > +- pxa_free_dma(drv_data->rx_channel);
> > +- }
> > ++ if (drv_data->master_info->enable_dma)
> > ++ pxa2xx_spi_dma_release(drv_data);
> > ++
> > ++ pm_runtime_put_noidle(&pdev->dev);
> > ++ pm_runtime_disable(&pdev->dev);
> > +
> > + /* Release IRQ */
> > + free_irq(ssp->irq, drv_data);
> > +@@ -1749,11 +1330,11 @@ static int pxa2xx_spi_suspend(struct device
> *dev)
> > + struct ssp_device *ssp = drv_data->ssp;
> > + int status = 0;
> > +
> > +- status = stop_queue(drv_data);
> > ++ status = spi_master_suspend(drv_data->master);
> > + if (status != 0)
> > + return status;
> > + write_SSCR0(0, drv_data->ioaddr);
> > +- clk_disable(ssp->clk);
> > ++ clk_disable_unprepare(ssp->clk);
> > +
> > + return 0;
> > + }
> > +@@ -1764,18 +1345,15 @@ static int pxa2xx_spi_resume(struct device
> *dev)
> > + struct ssp_device *ssp = drv_data->ssp;
> > + int status = 0;
> > +
> > +- if (drv_data->rx_channel != -1)
> > +- DRCMR(drv_data->ssp->drcmr_rx) =
> > +- DRCMR_MAPVLD | drv_data->rx_channel;
> > +- if (drv_data->tx_channel != -1)
> > +- DRCMR(drv_data->ssp->drcmr_tx) =
> > +- DRCMR_MAPVLD | drv_data->tx_channel;
> > ++ pxa2xx_spi_dma_resume(drv_data);
> > +
> > + /* Enable the SSP clock */
> > +- clk_enable(ssp->clk);
> > ++ clk_prepare_enable(ssp->clk);
> > ++
> > ++ lpss_ssp_setup(drv_data);
> > +
> > + /* Start the queue running */
> > +- status = start_queue(drv_data);
> > ++ status = spi_master_resume(drv_data->master);
> > + if (status != 0) {
> > + dev_err(dev, "problem starting queue (%d)\n", status);
> > + return status;
> > +@@ -1783,20 +1361,38 @@ static int pxa2xx_spi_resume(struct device
> *dev)
> > +
> > + return 0;
> > + }
> > ++#endif
> > ++
> > ++#ifdef CONFIG_PM_RUNTIME
> > ++static int pxa2xx_spi_runtime_suspend(struct device *dev)
> > ++{
> > ++ struct driver_data *drv_data = dev_get_drvdata(dev);
> > ++
> > ++ clk_disable_unprepare(drv_data->ssp->clk);
> > ++ return 0;
> > ++}
> > ++
> > ++static int pxa2xx_spi_runtime_resume(struct device *dev)
> > ++{
> > ++ struct driver_data *drv_data = dev_get_drvdata(dev);
> > ++
> > ++ clk_prepare_enable(drv_data->ssp->clk);
> > ++ return 0;
> > ++}
> > ++#endif
> > +
> > + static const struct dev_pm_ops pxa2xx_spi_pm_ops = {
> > +- .suspend = pxa2xx_spi_suspend,
> > +- .resume = pxa2xx_spi_resume,
> > ++ SET_SYSTEM_SLEEP_PM_OPS(pxa2xx_spi_suspend,
> pxa2xx_spi_resume)
> > ++ SET_RUNTIME_PM_OPS(pxa2xx_spi_runtime_suspend,
> > ++ pxa2xx_spi_runtime_resume, NULL)
> > + };
> > +-#endif
> > +
> > + static struct platform_driver driver = {
> > + .driver = {
> > + .name = "pxa2xx-spi",
> > + .owner = THIS_MODULE,
> > +-#ifdef CONFIG_PM
> > + .pm = &pxa2xx_spi_pm_ops,
> > +-#endif
> > ++ .acpi_match_table = ACPI_PTR(pxa2xx_spi_acpi_match),
> > + },
> > + .probe = pxa2xx_spi_probe,
> > + .remove = pxa2xx_spi_remove,
> > +diff --git a/drivers/spi/spi-pxa2xx.h b/drivers/spi/spi-pxa2xx.h
> > +new file mode 100644
> > +index 0000000..5adc2a1
> > +--- /dev/null
> > ++++ b/drivers/spi/spi-pxa2xx.h
> > +@@ -0,0 +1,221 @@
> > ++/*
> > ++ * Copyright (C) 2005 Stephen Street / StreetFire Sound Labs
> > ++ * Copyright (C) 2013, Intel Corporation
> > ++ *
> > ++ * This program is free software; you can redistribute it and/or modify
> > ++ * it under the terms of the GNU General Public License version 2 as
> > ++ * published by the Free Software Foundation.
> > ++ */
> > ++
> > ++#ifndef SPI_PXA2XX_H
> > ++#define SPI_PXA2XX_H
> > ++
> > ++#include <linux/atomic.h>
> > ++#include <linux/dmaengine.h>
> > ++#include <linux/errno.h>
> > ++#include <linux/io.h>
> > ++#include <linux/interrupt.h>
> > ++#include <linux/platform_device.h>
> > ++#include <linux/pxa2xx_ssp.h>
> > ++#include <linux/scatterlist.h>
> > ++#include <linux/sizes.h>
> > ++#include <linux/spi/spi.h>
> > ++#include <linux/spi/pxa2xx_spi.h>
> > ++
> > ++struct driver_data {
> > ++ /* Driver model hookup */
> > ++ struct platform_device *pdev;
> > ++
> > ++ /* SSP Info */
> > ++ struct ssp_device *ssp;
> > ++
> > ++ /* SPI framework hookup */
> > ++ enum pxa_ssp_type ssp_type;
> > ++ struct spi_master *master;
> > ++
> > ++ /* PXA hookup */
> > ++ struct pxa2xx_spi_master *master_info;
> > ++
> > ++ /* PXA private DMA setup stuff */
> > ++ int rx_channel;
> > ++ int tx_channel;
> > ++ u32 *null_dma_buf;
> > ++
> > ++ /* SSP register addresses */
> > ++ void __iomem *ioaddr;
> > ++ u32 ssdr_physical;
> > ++
> > ++ /* SSP masks*/
> > ++ u32 dma_cr1;
> > ++ u32 int_cr1;
> > ++ u32 clear_sr;
> > ++ u32 mask_sr;
> > ++
> > ++ /* Maximun clock rate */
> > ++ unsigned long max_clk_rate;
> > ++
> > ++ /* Message Transfer pump */
> > ++ struct tasklet_struct pump_transfers;
> > ++
> > ++ /* DMA engine support */
> > ++ struct dma_chan *rx_chan;
> > ++ struct dma_chan *tx_chan;
> > ++ struct sg_table rx_sgt;
> > ++ struct sg_table tx_sgt;
> > ++ int rx_nents;
> > ++ int tx_nents;
> > ++ void *dummy;
> > ++ atomic_t dma_running;
> > ++
> > ++ /* Current message transfer state info */
> > ++ struct spi_message *cur_msg;
> > ++ struct spi_transfer *cur_transfer;
> > ++ struct chip_data *cur_chip;
> > ++ size_t len;
> > ++ void *tx;
> > ++ void *tx_end;
> > ++ void *rx;
> > ++ void *rx_end;
> > ++ int dma_mapped;
> > ++ dma_addr_t rx_dma;
> > ++ dma_addr_t tx_dma;
> > ++ size_t rx_map_len;
> > ++ size_t tx_map_len;
> > ++ u8 n_bytes;
> > ++ int (*write)(struct driver_data *drv_data);
> > ++ int (*read)(struct driver_data *drv_data);
> > ++ irqreturn_t (*transfer_handler)(struct driver_data *drv_data);
> > ++ void (*cs_control)(u32 command);
> > ++
> > ++ void __iomem *lpss_base;
> > ++};
> > ++
> > ++struct chip_data {
> > ++ u32 cr0;
> > ++ u32 cr1;
> > ++ u32 psp;
> > ++ u32 timeout;
> > ++ u8 n_bytes;
> > ++ u32 dma_burst_size;
> > ++ u32 threshold;
> > ++ u32 dma_threshold;
> > ++ u16 lpss_rx_threshold;
> > ++ u16 lpss_tx_threshold;
> > ++ u8 enable_dma;
> > ++ u8 bits_per_word;
> > ++ u32 speed_hz;
> > ++ union {
> > ++ int gpio_cs;
> > ++ unsigned int frm;
> > ++ };
> > ++ int gpio_cs_inverted;
> > ++ int (*write)(struct driver_data *drv_data);
> > ++ int (*read)(struct driver_data *drv_data);
> > ++ void (*cs_control)(u32 command);
> > ++};
> > ++
> > ++#define DEFINE_SSP_REG(reg, off) \
> > ++static inline u32 read_##reg(void const __iomem *p) \
> > ++{ return __raw_readl(p + (off)); } \
> > ++\
> > ++static inline void write_##reg(u32 v, void __iomem *p) \
> > ++{ __raw_writel(v, p + (off)); }
> > ++
> > ++DEFINE_SSP_REG(SSCR0, 0x00)
> > ++DEFINE_SSP_REG(SSCR1, 0x04)
> > ++DEFINE_SSP_REG(SSSR, 0x08)
> > ++DEFINE_SSP_REG(SSITR, 0x0c)
> > ++DEFINE_SSP_REG(SSDR, 0x10)
> > ++DEFINE_SSP_REG(SSTO, 0x28)
> > ++DEFINE_SSP_REG(SSPSP, 0x2c)
> > ++DEFINE_SSP_REG(SSITF, SSITF)
> > ++DEFINE_SSP_REG(SSIRF, SSIRF)
> > ++
> > ++#define START_STATE ((void *)0)
> > ++#define RUNNING_STATE ((void *)1)
> > ++#define DONE_STATE ((void *)2)
> > ++#define ERROR_STATE ((void *)-1)
> > ++
> > ++#define IS_DMA_ALIGNED(x) IS_ALIGNED((unsigned long)(x),
> DMA_ALIGNMENT)
> > ++#define DMA_ALIGNMENT 8
> > ++
> > ++static inline int pxa25x_ssp_comp(struct driver_data *drv_data)
> > ++{
> > ++ if (drv_data->ssp_type == PXA25x_SSP)
> > ++ return 1;
> > ++ if (drv_data->ssp_type == CE4100_SSP)
> > ++ return 1;
> > ++ return 0;
> > ++}
> > ++
> > ++static inline void write_SSSR_CS(struct driver_data *drv_data, u32 val)
> > ++{
> > ++ void __iomem *reg = drv_data->ioaddr;
> > ++
> > ++ if (drv_data->ssp_type == CE4100_SSP)
> > ++ val |= read_SSSR(reg) & SSSR_ALT_FRM_MASK;
> > ++
> > ++ write_SSSR(val, reg);
> > ++}
> > ++
> > ++extern int pxa2xx_spi_flush(struct driver_data *drv_data);
> > ++extern void *pxa2xx_spi_next_transfer(struct driver_data *drv_data);
> > ++
> > ++/*
> > ++ * Select the right DMA implementation.
> > ++ */
> > ++#if defined(CONFIG_SPI_PXA2XX_PXADMA)
> > ++#define SPI_PXA2XX_USE_DMA 1
> > ++#define MAX_DMA_LEN 8191
> > ++#define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE |
> SSCR1_TINTE)
> > ++#elif defined(CONFIG_SPI_PXA2XX_DMA)
> > ++#define SPI_PXA2XX_USE_DMA 1
> > ++#define MAX_DMA_LEN SZ_64K
> > ++#define DEFAULT_DMA_CR1 (SSCR1_TSRE | SSCR1_RSRE |
> SSCR1_TRAIL)
> > ++#else
> > ++#undef SPI_PXA2XX_USE_DMA
> > ++#define MAX_DMA_LEN 0
> > ++#define DEFAULT_DMA_CR1 0
> > ++#endif
> > ++
> > ++#ifdef SPI_PXA2XX_USE_DMA
> > ++extern bool pxa2xx_spi_dma_is_possible(size_t len);
> > ++extern int pxa2xx_spi_map_dma_buffers(struct driver_data *drv_data);
> > ++extern irqreturn_t pxa2xx_spi_dma_transfer(struct driver_data
> *drv_data);
> > ++extern int pxa2xx_spi_dma_prepare(struct driver_data *drv_data, u32
> dma_burst);
> > ++extern void pxa2xx_spi_dma_start(struct driver_data *drv_data);
> > ++extern int pxa2xx_spi_dma_setup(struct driver_data *drv_data);
> > ++extern void pxa2xx_spi_dma_release(struct driver_data *drv_data);
> > ++extern void pxa2xx_spi_dma_resume(struct driver_data *drv_data);
> > ++extern int pxa2xx_spi_set_dma_burst_and_threshold(struct chip_data
> *chip,
> > ++ struct spi_device *spi,
> > ++ u8 bits_per_word,
> > ++ u32 *burst_code,
> > ++ u32 *threshold);
> > ++#else
> > ++static inline bool pxa2xx_spi_dma_is_possible(size_t len) { return false; }
> > ++static inline int pxa2xx_spi_map_dma_buffers(struct driver_data
> *drv_data)
> > ++{
> > ++ return 0;
> > ++}
> > ++#define pxa2xx_spi_dma_transfer NULL
> > ++static inline void pxa2xx_spi_dma_prepare(struct driver_data *drv_data,
> > ++ u32 dma_burst) {}
> > ++static inline void pxa2xx_spi_dma_start(struct driver_data *drv_data) {}
> > ++static inline int pxa2xx_spi_dma_setup(struct driver_data *drv_data)
> > ++{
> > ++ return 0;
> > ++}
> > ++static inline void pxa2xx_spi_dma_release(struct driver_data *drv_data)
> {}
> > ++static inline void pxa2xx_spi_dma_resume(struct driver_data *drv_data)
> {}
> > ++static inline int pxa2xx_spi_set_dma_burst_and_threshold(struct
> chip_data *chip,
> > ++ struct spi_device *spi,
> > ++ u8 bits_per_word,
> > ++ u32 *burst_code,
> > ++ u32 *threshold)
> > ++{
> > ++ return -ENODEV;
> > ++}
> > ++#endif
> > ++
> > ++#endif /* SPI_PXA2XX_H */
> > +diff --git a/include/linux/pxa2xx_ssp.h b/include/linux/pxa2xx_ssp.h
> > +index f366320..467cc63 100644
> > +--- a/include/linux/pxa2xx_ssp.h
> > ++++ b/include/linux/pxa2xx_ssp.h
> > +@@ -155,6 +155,14 @@
> > + #define SSACD_ACDS(x) ((x) << 0) /* Audio clock divider
> select */
> > + #define SSACD_SCDX8 (1 << 7) /* SYSCLK division ratio select
> */
> > +
> > ++/* LPSS SSP */
> > ++#define SSITF 0x44 /* TX FIFO trigger
> level */
> > ++#define SSITF_TxLoThresh(x) (((x) - 1) << 8)
> > ++#define SSITF_TxHiThresh(x) ((x) - 1)
> > ++
> > ++#define SSIRF 0x48 /* RX FIFO trigger
> level */
> > ++#define SSIRF_RxThresh(x) ((x) - 1)
> > ++
> > + enum pxa_ssp_type {
> > + SSP_UNDEFINED = 0,
> > + PXA25x_SSP, /* pxa 210, 250, 255, 26x */
> > +@@ -164,6 +172,7 @@ enum pxa_ssp_type {
> > + PXA168_SSP,
> > + PXA910_SSP,
> > + CE4100_SSP,
> > ++ LPSS_SSP,
> > + };
> > +
> > + struct ssp_device {
> > +@@ -206,6 +215,15 @@ static inline u32 pxa_ssp_read_reg(struct
> ssp_device *dev, u32 reg)
> > + return __raw_readl(dev->mmio_base + reg);
> > + }
> > +
> > ++#ifdef CONFIG_ARCH_PXA
> > + struct ssp_device *pxa_ssp_request(int port, const char *label);
> > + void pxa_ssp_free(struct ssp_device *);
> > ++#else
> > ++static inline struct ssp_device *pxa_ssp_request(int port, const char
> *label)
> > ++{
> > ++ return NULL;
> > ++}
> > ++static inline void pxa_ssp_free(struct ssp_device *ssp) {}
> > ++#endif
> > ++
> > + #endif
> > +diff --git a/include/linux/spi/pxa2xx_spi.h
> b/include/linux/spi/pxa2xx_spi.h
> > +index c73d144..82d5111 100644
> > +--- a/include/linux/spi/pxa2xx_spi.h
> > ++++ b/include/linux/spi/pxa2xx_spi.h
> > +@@ -28,6 +28,15 @@ struct pxa2xx_spi_master {
> > + u32 clock_enable;
> > + u16 num_chipselect;
> > + u8 enable_dma;
> > ++
> > ++ /* DMA engine specific config */
> > ++ int rx_chan_id;
> > ++ int tx_chan_id;
> > ++ int rx_slave_id;
> > ++ int tx_slave_id;
> > ++
> > ++ /* For non-PXA arches */
> > ++ struct ssp_device ssp;
> > + };
> > +
> > + /* spi_board_info.controller_data for SPI slave devices,
> > +@@ -35,6 +44,7 @@ struct pxa2xx_spi_master {
> > + */
> > + struct pxa2xx_spi_chip {
> > + u8 tx_threshold;
> > ++ u8 tx_hi_threshold;
> > + u8 rx_threshold;
> > + u8 dma_burst_size;
> > + u32 timeout;
> > +@@ -50,103 +60,5 @@ struct pxa2xx_spi_chip {
> > +
> > + extern void pxa2xx_set_spi_info(unsigned id, struct pxa2xx_spi_master
> *info);
> > +
> > +-#else
> > +-/*
> > +- * This is the implemtation for CE4100 on x86. ARM defines them in
> mach/ or
> > +- * plat/ include path.
> > +- * The CE4100 does not provide DMA support. This bits are here to let the
> driver
> > +- * compile and will never be used. Maybe we get DMA support at a later
> point in
> > +- * time.
> > +- */
> > +-
> > +-#define DCSR(n) (n)
> > +-#define DSADR(n) (n)
> > +-#define DTADR(n) (n)
> > +-#define DCMD(n) (n)
> > +-#define DRCMR(n) (n)
> > +-
> > +-#define DCSR_RUN (1 << 31) /* Run Bit */
> > +-#define DCSR_NODESC (1 << 30) /* No-Descriptor Fetch */
> > +-#define DCSR_STOPIRQEN (1 << 29) /* Stop Interrupt Enable */
> > +-#define DCSR_REQPEND (1 << 8) /* Request Pending (read-only) */
> > +-#define DCSR_STOPSTATE (1 << 3) /* Stop State (read-only) */
> > +-#define DCSR_ENDINTR (1 << 2) /* End Interrupt */
> > +-#define DCSR_STARTINTR (1 << 1) /* Start Interrupt */
> > +-#define DCSR_BUSERR (1 << 0) /* Bus Error Interrupt */
> > +-
> > +-#define DCSR_EORIRQEN (1 << 28) /* End of Receive Interrupt
> Enable */
> > +-#define DCSR_EORJMPEN (1 << 27) /* Jump to next descriptor on
> EOR */
> > +-#define DCSR_EORSTOPEN (1 << 26) /* STOP on an EOR */
> > +-#define DCSR_SETCMPST (1 << 25) /* Set Descriptor Compare
> Status */
> > +-#define DCSR_CLRCMPST (1 << 24) /* Clear Descriptor Compare
> Status */
> > +-#define DCSR_CMPST (1 << 10) /* The Descriptor Compare
> Status */
> > +-#define DCSR_EORINTR (1 << 9) /* The end of Receive */
> > +-
> > +-#define DRCMR_MAPVLD (1 << 7) /* Map Valid */
> > +-#define DRCMR_CHLNUM 0x1f /* mask for Channel Number
> */
> > +-
> > +-#define DDADR_DESCADDR 0xfffffff0 /* Address of next
> descriptor */
> > +-#define DDADR_STOP (1 << 0) /* Stop */
> > +-
> > +-#define DCMD_INCSRCADDR (1 << 31) /* Source Address
> Increment Setting. */
> > +-#define DCMD_INCTRGADDR (1 << 30) /* Target Address
> Increment Setting. */
> > +-#define DCMD_FLOWSRC (1 << 29) /* Flow Control by the source.
> */
> > +-#define DCMD_FLOWTRG (1 << 28) /* Flow Control by the target.
> */
> > +-#define DCMD_STARTIRQEN (1 << 22) /* Start Interrupt
> Enable */
> > +-#define DCMD_ENDIRQEN (1 << 21) /* End Interrupt Enable */
> > +-#define DCMD_ENDIAN (1 << 18) /* Device Endian-ness. */
> > +-#define DCMD_BURST8 (1 << 16) /* 8 byte burst */
> > +-#define DCMD_BURST16 (2 << 16) /* 16 byte burst */
> > +-#define DCMD_BURST32 (3 << 16) /* 32 byte burst */
> > +-#define DCMD_WIDTH1 (1 << 14) /* 1 byte width */
> > +-#define DCMD_WIDTH2 (2 << 14) /* 2 byte width (HalfWord) */
> > +-#define DCMD_WIDTH4 (3 << 14) /* 4 byte width (Word) */
> > +-#define DCMD_LENGTH 0x01fff /* length mask (max = 8K - 1)
> */
> > +-
> > +-/*
> > +- * Descriptor structure for PXA's DMA engine
> > +- * Note: this structure must always be aligned to a 16-byte boundary.
> > +- */
> > +-
> > +-typedef enum {
> > +- DMA_PRIO_HIGH = 0,
> > +- DMA_PRIO_MEDIUM = 1,
> > +- DMA_PRIO_LOW = 2
> > +-} pxa_dma_prio;
> > +-
> > +-/*
> > +- * DMA registration
> > +- */
> > +-
> > +-static inline int pxa_request_dma(char *name,
> > +- pxa_dma_prio prio,
> > +- void (*irq_handler)(int, void *),
> > +- void *data)
> > +-{
> > +- return -ENODEV;
> > +-}
> > +-
> > +-static inline void pxa_free_dma(int dma_ch)
> > +-{
> > +-}
> > +-
> > +-/*
> > +- * The CE4100 does not have the clk framework implemented and SPI
> clock can
> > +- * not be switched on/off or the divider changed.
> > +- */
> > +-static inline void clk_disable(struct clk *clk)
> > +-{
> > +-}
> > +-
> > +-static inline int clk_enable(struct clk *clk)
> > +-{
> > +- return 0;
> > +-}
> > +-
> > +-static inline unsigned long clk_get_rate(struct clk *clk)
> > +-{
> > +- return 3686400;
> > +-}
> > +-
> > + #endif
> > + #endif
> > +--
> > +1.7.10.4
> > +
> >
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