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spi: Updates for v4.2 

No framework updates for the SPI API this time around aside from one
 small fix, just driver improvments.  Some highlights include:
 
  - New driver support for CSR USP, Mikrotik RB4xx and Zynq GQSPI
    controllers.
  - Modernisation of the OMAP McSPI controller driver, moving it to
    current APIs to enable support for a wider range of client drivers.
  - DMA support for the bcm2835 controller.
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Merge tag 'spi-v4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi

Pull spi updates from Mark Brown:
 "No framework updates for the SPI API this time around aside from one
  small fix, just driver improvments.  Some highlights include:

   - New driver support for CSR USP, Mikrotik RB4xx and Zynq GQSPI
     controllers.

   - Modernisation of the OMAP McSPI controller driver, moving it to
     current APIs to enable support for a wider range of client drivers.

   - DMA support for the bcm2835 controller"

* tag 'spi-v4.2' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi: (60 commits)
  spi: zynq: Remove execute bit
  spi: atmel: add support to FIFOs
  spi: atmel: update DT bindings documentation
  spi: spi-fsl-dspi: Update DT binding documentation
  spi: pxa2xx: Constify ACPI device ids
  spi: Add support for Zynq Ultrascale+ MPSoC GQSPI controller
  spi: zynq: Add DT bindings documentation for Zynq Ultrascale+ MPSoC GQSPI controller
  spi: fsl-dspi: Use pinctrl PM helpers
  spi: davinci: change the lower limit of pre-scale divider to 1
  spi: spi-fsl-dspi: Change the way of increasing spi_message->actual_length
  spi: spi-fsl-dspi: Enable TCF interrupt mode support
  spi: atmel: add support for the internal chip-select of the spi controller
  spi: spi-pxa2xx: remove legacy PXA DMA bits
  spi: pxa2xx: Make LPSS SPI general register optional
  spi: pxa2xx: Prepare for new Intel LPSS SPI type
  spi: pxa2xx: Differentiate Intel LPSS types
  spi: restore rx/tx_buf in case of unset CONFIG_HAS_DMA
  spi: rspi: Re-do the returning value of qspi_transfer_out_in
  spi: rspi: modify the name of "qspi_trigger_transfer_out_int" function
  spi: orion: Fix extended baud rates for each Armada SoCs
  ...
This commit is contained in:
Linus Torvalds 2015-06-23 17:27:09 -07:00
parent e12bdf0d92 fda052b0a5
commit 5a602e157a
32 changed files with 3292 additions and 1198 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
Documentation/devicetree/bindings/spi/spi-ath79.txt Normal file
View File

@ -0,0 +1,24 @@
Binding for Qualcomm Atheros AR7xxx/AR9xxx SPI controller
Required properties:
- compatible: has to be "qca,<soc-type>-spi", "qca,ar7100-spi" as fallback.
- reg: Base address and size of the controllers memory area
- clocks: phandle to the AHB clock.
- clock-names: has to be "ahb".
- #address-cells: <1>, as required by generic SPI binding.
- #size-cells: <0>, also as required by generic SPI binding.
Child nodes as per the generic SPI binding.
Example:
spi@1F000000 {
compatible = "qca,ar9132-spi", "qca,ar7100-spi";
reg = <0x1F000000 0x10>;
clocks = <&pll 2>;
clock-names = "ahb";
#address-cells = <1>;
#size-cells = <0>;
};

2
Documentation/devicetree/bindings/spi/spi-fsl-dspi.txt
View File

@ -1,7 +1,7 @@
ARM Freescale DSPI controller
Required properties:
- compatible : "fsl,vf610-dspi"
- compatible : "fsl,vf610-dspi", "fsl,ls1021a-v1.0-dspi", "fsl,ls2085a-dspi"
- reg : Offset and length of the register set for the device
- interrupts : Should contain SPI controller interrupt
- clocks: from common clock binding: handle to dspi clock.

8
Documentation/devicetree/bindings/spi/spi-orion.txt
View File

@ -1,7 +1,13 @@
Marvell Orion SPI device
Required properties:
- compatible : should be "marvell,orion-spi" or "marvell,armada-370-spi".
- compatible : should be on of the following:
- "marvell,orion-spi" for the Orion, mv78x00, Kirkwood and Dove SoCs
- "marvell,armada-370-spi", for the Armada 370 SoCs
- "marvell,armada-375-spi", for the Armada 375 SoCs
- "marvell,armada-380-spi", for the Armada 38x SoCs
- "marvell,armada-390-spi", for the Armada 39x SoCs
- "marvell,armada-xp-spi", for the Armada XP SoCs
- reg : offset and length of the register set for the device
- cell-index : Which of multiple SPI controllers is this.
Optional properties:

3
Documentation/devicetree/bindings/spi/spi-sirf.txt
View File

@ -1,7 +1,8 @@
* CSR SiRFprimaII Serial Peripheral Interface
Required properties:
- compatible : Should be "sirf,prima2-spi"
- compatible : Should be "sirf,prima2-spi", "sirf,prima2-usp"
or "sirf,atlas7-usp"
- reg : Offset and length of the register set for the device
- interrupts : Should contain SPI interrupt
- resets: phandle to the reset controller asserting this device in

26
Documentation/devicetree/bindings/spi/spi-zynqmp-qspi.txt Normal file
View File

@ -0,0 +1,26 @@
Xilinx Zynq UltraScale+ MPSoC GQSPI controller Device Tree Bindings
-------------------------------------------------------------------
Required properties:
- compatible : Should be "xlnx,zynqmp-qspi-1.0".
- reg : Physical base address and size of GQSPI registers map.
- interrupts : Property with a value describing the interrupt
number.
- interrupt-parent : Must be core interrupt controller.
- clock-names : List of input clock names - "ref_clk", "pclk"
(See clock bindings for details).
- clocks : Clock phandles (see clock bindings for details).
Optional properties:
- num-cs : Number of chip selects used.
Example:
qspi: spi@ff0f0000 {
compatible = "xlnx,zynqmp-qspi-1.0";
clock-names = "ref_clk", "pclk";
clocks = <&misc_clk &misc_clk>;
interrupts = <0 15 4>;
interrupt-parent = <&gic>;
num-cs = <1>;
reg = <0x0 0xff0f0000 0x1000>,<0x0 0xc0000000 0x8000000>;
};

8
Documentation/devicetree/bindings/spi/spi_atmel.txt
View File

@ -4,11 +4,16 @@ Required properties:
- compatible : should be "atmel,at91rm9200-spi".
- reg: Address and length of the register set for the device
- interrupts: Should contain spi interrupt
- cs-gpios: chipselects
- cs-gpios: chipselects (optional for SPI controller version >= 2 with the
Chip Select Active After Transfer feature).
- clock-names: tuple listing input clock names.
Required elements: "spi_clk"
- clocks: phandles to input clocks.
Optional properties:
- atmel,fifo-size: maximum number of data the RX and TX FIFOs can store for FIFO
capable SPI controllers.
Example:
spi1: spi@fffcc000 {
@ -20,6 +25,7 @@ spi1: spi@fffcc000 {
clocks = <&spi1_clk>;
clock-names = "spi_clk";
cs-gpios = <&pioB 3 0>;
atmel,fifo-size = <32>;
status = "okay";
mmc-slot@0 {

2
Documentation/devicetree/bindings/spi/spi_pl022.txt
View File

@ -4,9 +4,9 @@ Required properties:
- compatible : "arm,pl022", "arm,primecell"
- reg : Offset and length of the register set for the device
- interrupts : Should contain SPI controller interrupt
- num-cs : total number of chipselects
Optional properties:
- num-cs : total number of chipselects
- cs-gpios : should specify GPIOs used for chipselects.
The gpios will be referred to as reg = <index> in the SPI child nodes.
If unspecified, a single SPI device without a chip select can be used.

4
arch/mips/include/asm/mach-ath79/ath79_spi_platform.h
View File

@ -16,8 +16,4 @@ struct ath79_spi_platform_data {
unsigned num_chipselect;
};
struct ath79_spi_controller_data {
unsigned gpio;
};
#endif /* _ATH79_SPI_PLATFORM_H */

26
drivers/spi/Kconfig
View File

@ -77,6 +77,7 @@ config SPI_ATMEL
config SPI_BCM2835
tristate "BCM2835 SPI controller"
depends on GPIOLIB
depends on ARCH_BCM2835 || COMPILE_TEST
depends on GPIOLIB
help
@ -221,7 +222,7 @@ config SPI_FALCON
config SPI_GPIO
tristate "GPIO-based bitbanging SPI Master"
depends on GPIOLIB
depends on GPIOLIB || COMPILE_TEST
select SPI_BITBANG
help
This simple GPIO bitbanging SPI master uses the arch-neutral GPIO
@ -327,7 +328,7 @@ config SPI_MESON_SPIFC
config SPI_OC_TINY
tristate "OpenCores tiny SPI"
depends on GPIOLIB
depends on GPIOLIB || COMPILE_TEST
select SPI_BITBANG
help
This is the driver for OpenCores tiny SPI master controller.
@ -394,16 +395,9 @@ 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
depends on SPI_PXA2XX
config SPI_PXA2XX
tristate "PXA2xx SSP SPI master"
@ -429,6 +423,12 @@ config SPI_ROCKCHIP
The main usecase of this controller is to use spi flash as boot
device.
config SPI_RB4XX
tristate "Mikrotik RB4XX SPI master"
depends on SPI_MASTER && ATH79
help
SPI controller driver for the Mikrotik RB4xx series boards.
config SPI_RSPI
tristate "Renesas RSPI/QSPI controller"
depends on SUPERH || ARCH_SHMOBILE || COMPILE_TEST
@ -610,6 +610,12 @@ config SPI_XTENSA_XTFPGA
16 bit words in SPI mode 0, automatically asserting CS on transfer
start and deasserting on end.
config SPI_ZYNQMP_GQSPI
tristate "Xilinx ZynqMP GQSPI controller"
depends on SPI_MASTER
help
Enables Xilinx GQSPI controller driver for Zynq UltraScale+ MPSoC.
config SPI_NUC900
tristate "Nuvoton NUC900 series SPI"
depends on ARCH_W90X900

3
drivers/spi/Makefile
View File

@ -60,12 +60,12 @@ obj-$(CONFIG_SPI_ORION) += spi-orion.o
obj-$(CONFIG_SPI_PL022) += spi-pl022.o
obj-$(CONFIG_SPI_PPC4xx) += spi-ppc4xx.o
spi-pxa2xx-platform-objs := spi-pxa2xx.o
spi-pxa2xx-platform-$(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_QUP) += spi-qup.o
obj-$(CONFIG_SPI_ROCKCHIP) += spi-rockchip.o
obj-$(CONFIG_SPI_RB4XX) += spi-rb4xx.o
obj-$(CONFIG_SPI_RSPI) += spi-rspi.o
obj-$(CONFIG_SPI_S3C24XX) += spi-s3c24xx-hw.o
spi-s3c24xx-hw-y := spi-s3c24xx.o
@ -89,3 +89,4 @@ obj-$(CONFIG_SPI_TXX9) += spi-txx9.o
obj-$(CONFIG_SPI_XCOMM) += spi-xcomm.o
obj-$(CONFIG_SPI_XILINX) += spi-xilinx.o
obj-$(CONFIG_SPI_XTENSA_XTFPGA) += spi-xtensa-xtfpga.o
obj-$(CONFIG_SPI_ZYNQMP_GQSPI) += spi-zynqmp-gqspi.o

34
drivers/spi/spi-ath79.c
View File

@ -79,10 +79,8 @@ static void ath79_spi_chipselect(struct spi_device *spi, int is_active)
}
if (spi->chip_select) {
struct ath79_spi_controller_data *cdata = spi->controller_data;
/* SPI is normally active-low */
gpio_set_value(cdata->gpio, cs_high);
gpio_set_value(spi->cs_gpio, cs_high);
} else {
if (cs_high)
sp->ioc_base |= AR71XX_SPI_IOC_CS0;
@ -117,11 +115,10 @@ static void ath79_spi_disable(struct ath79_spi *sp)
static int ath79_spi_setup_cs(struct spi_device *spi)
{
struct ath79_spi_controller_data *cdata;
struct ath79_spi *sp = ath79_spidev_to_sp(spi);
int status;
cdata = spi->controller_data;
if (spi->chip_select && !cdata)
if (spi->chip_select && !gpio_is_valid(spi->cs_gpio))
return -EINVAL;
status = 0;
@ -134,8 +131,15 @@ static int ath79_spi_setup_cs(struct spi_device *spi)
else
flags |= GPIOF_INIT_HIGH;
status = gpio_request_one(cdata->gpio, flags,
status = gpio_request_one(spi->cs_gpio, flags,
dev_name(&spi->dev));
} else {
if (spi->mode & SPI_CS_HIGH)
sp->ioc_base &= ~AR71XX_SPI_IOC_CS0;
else
sp->ioc_base |= AR71XX_SPI_IOC_CS0;
ath79_spi_wr(sp, AR71XX_SPI_REG_IOC, sp->ioc_base);
}
return status;
@ -144,8 +148,7 @@ static int ath79_spi_setup_cs(struct spi_device *spi)
static void ath79_spi_cleanup_cs(struct spi_device *spi)
{
if (spi->chip_select) {
struct ath79_spi_controller_data *cdata = spi->controller_data;
gpio_free(cdata->gpio);
gpio_free(spi->cs_gpio);
}
}
@ -217,6 +220,7 @@ static int ath79_spi_probe(struct platform_device *pdev)
}
sp = spi_master_get_devdata(master);
master->dev.of_node = pdev->dev.of_node;
platform_set_drvdata(pdev, sp);
pdata = dev_get_platdata(&pdev->dev);
@ -253,7 +257,7 @@ static int ath79_spi_probe(struct platform_device *pdev)
goto err_put_master;
}
ret = clk_enable(sp->clk);
ret = clk_prepare_enable(sp->clk);
if (ret)
goto err_put_master;
@ -277,7 +281,7 @@ static int ath79_spi_probe(struct platform_device *pdev)
err_disable:
ath79_spi_disable(sp);
err_clk_disable:
clk_disable(sp->clk);
clk_disable_unprepare(sp->clk);
err_put_master:
spi_master_put(sp->bitbang.master);
@ -290,7 +294,7 @@ static int ath79_spi_remove(struct platform_device *pdev)
spi_bitbang_stop(&sp->bitbang);
ath79_spi_disable(sp);
clk_disable(sp->clk);
clk_disable_unprepare(sp->clk);
spi_master_put(sp->bitbang.master);
return 0;
@ -301,12 +305,18 @@ static void ath79_spi_shutdown(struct platform_device *pdev)
ath79_spi_remove(pdev);
}
static const struct of_device_id ath79_spi_of_match[] = {
{ .compatible = "qca,ar7100-spi", },
{ },
};
static struct platform_driver ath79_spi_driver = {
.probe = ath79_spi_probe,
.remove = ath79_spi_remove,
.shutdown = ath79_spi_shutdown,
.driver = {
.name = DRV_NAME,
.of_match_table = ath79_spi_of_match,
},
};
module_platform_driver(ath79_spi_driver);

292
drivers/spi/spi-atmel.c
View File

@ -41,6 +41,8 @@
#define SPI_CSR1 0x0034
#define SPI_CSR2 0x0038
#define SPI_CSR3 0x003c
#define SPI_FMR 0x0040
#define SPI_FLR 0x0044
#define SPI_VERSION 0x00fc
#define SPI_RPR 0x0100
#define SPI_RCR 0x0104
@ -62,6 +64,14 @@
#define SPI_SWRST_SIZE 1
#define SPI_LASTXFER_OFFSET 24
#define SPI_LASTXFER_SIZE 1
#define SPI_TXFCLR_OFFSET 16
#define SPI_TXFCLR_SIZE 1
#define SPI_RXFCLR_OFFSET 17
#define SPI_RXFCLR_SIZE 1
#define SPI_FIFOEN_OFFSET 30
#define SPI_FIFOEN_SIZE 1
#define SPI_FIFODIS_OFFSET 31
#define SPI_FIFODIS_SIZE 1
/* Bitfields in MR */
#define SPI_MSTR_OFFSET 0
@ -114,6 +124,22 @@
#define SPI_TXEMPTY_SIZE 1
#define SPI_SPIENS_OFFSET 16
#define SPI_SPIENS_SIZE 1
#define SPI_TXFEF_OFFSET 24
#define SPI_TXFEF_SIZE 1
#define SPI_TXFFF_OFFSET 25
#define SPI_TXFFF_SIZE 1
#define SPI_TXFTHF_OFFSET 26
#define SPI_TXFTHF_SIZE 1
#define SPI_RXFEF_OFFSET 27
#define SPI_RXFEF_SIZE 1
#define SPI_RXFFF_OFFSET 28
#define SPI_RXFFF_SIZE 1
#define SPI_RXFTHF_OFFSET 29
#define SPI_RXFTHF_SIZE 1
#define SPI_TXFPTEF_OFFSET 30
#define SPI_TXFPTEF_SIZE 1
#define SPI_RXFPTEF_OFFSET 31
#define SPI_RXFPTEF_SIZE 1
/* Bitfields in CSR0 */
#define SPI_CPOL_OFFSET 0
@ -157,6 +183,22 @@
#define SPI_TXTDIS_OFFSET 9
#define SPI_TXTDIS_SIZE 1
/* Bitfields in FMR */
#define SPI_TXRDYM_OFFSET 0
#define SPI_TXRDYM_SIZE 2
#define SPI_RXRDYM_OFFSET 4
#define SPI_RXRDYM_SIZE 2
#define SPI_TXFTHRES_OFFSET 16
#define SPI_TXFTHRES_SIZE 6
#define SPI_RXFTHRES_OFFSET 24
#define SPI_RXFTHRES_SIZE 6
/* Bitfields in FLR */
#define SPI_TXFL_OFFSET 0
#define SPI_TXFL_SIZE 6
#define SPI_RXFL_OFFSET 16
#define SPI_RXFL_SIZE 6
/* Constants for BITS */
#define SPI_BITS_8_BPT 0
#define SPI_BITS_9_BPT 1
@ -167,6 +209,9 @@
#define SPI_BITS_14_BPT 6
#define SPI_BITS_15_BPT 7
#define SPI_BITS_16_BPT 8
#define SPI_ONE_DATA 0
#define SPI_TWO_DATA 1
#define SPI_FOUR_DATA 2
/* Bit manipulation macros */
#define SPI_BIT(name) \
@ -185,11 +230,31 @@
__raw_readl((port)->regs + SPI_##reg)
#define spi_writel(port, reg, value) \
__raw_writel((value), (port)->regs + SPI_##reg)
#define spi_readw(port, reg) \
__raw_readw((port)->regs + SPI_##reg)
#define spi_writew(port, reg, value) \
__raw_writew((value), (port)->regs + SPI_##reg)
#define spi_readb(port, reg) \
__raw_readb((port)->regs + SPI_##reg)
#define spi_writeb(port, reg, value) \
__raw_writeb((value), (port)->regs + SPI_##reg)
#else
#define spi_readl(port, reg) \
readl_relaxed((port)->regs + SPI_##reg)
#define spi_writel(port, reg, value) \
writel_relaxed((value), (port)->regs + SPI_##reg)
#define spi_readw(port, reg) \
readw_relaxed((port)->regs + SPI_##reg)
#define spi_writew(port, reg, value) \
writew_relaxed((value), (port)->regs + SPI_##reg)
#define spi_readb(port, reg) \
readb_relaxed((port)->regs + SPI_##reg)
#define spi_writeb(port, reg, value) \
writeb_relaxed((value), (port)->regs + SPI_##reg)
#endif
/* use PIO for small transfers, avoiding DMA setup/teardown overhead and
* cache operations; better heuristics consider wordsize and bitrate.
@ -246,11 +311,14 @@ struct atmel_spi {
bool use_dma;
bool use_pdc;
bool use_cs_gpios;
/* dmaengine data */
struct atmel_spi_dma dma;
bool keep_cs;
bool cs_active;
u32 fifo_size;
};
/* Controller-specific per-slave state */
@ -321,7 +389,8 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
}
mr = spi_readl(as, MR);
gpio_set_value(asd->npcs_pin, active);
if (as->use_cs_gpios)
gpio_set_value(asd->npcs_pin, active);
} else {
u32 cpol = (spi->mode & SPI_CPOL) ? SPI_BIT(CPOL) : 0;
int i;
@ -337,7 +406,7 @@ static void cs_activate(struct atmel_spi *as, struct spi_device *spi)
mr = spi_readl(as, MR);
mr = SPI_BFINS(PCS, ~(1 << spi->chip_select), mr);
if (spi->chip_select != 0)
if (as->use_cs_gpios && spi->chip_select != 0)
gpio_set_value(asd->npcs_pin, active);
spi_writel(as, MR, mr);
}
@ -366,7 +435,9 @@ static void cs_deactivate(struct atmel_spi *as, struct spi_device *spi)
asd->npcs_pin, active ? " (low)" : "",
mr);
if (atmel_spi_is_v2(as) || spi->chip_select != 0)
if (!as->use_cs_gpios)
spi_writel(as, CR, SPI_BIT(LASTXFER));
else if (atmel_spi_is_v2(as) || spi->chip_select != 0)
gpio_set_value(asd->npcs_pin, !active);
}
@ -406,6 +477,20 @@ static int atmel_spi_dma_slave_config(struct atmel_spi *as,
slave_config->dst_maxburst = 1;
slave_config->device_fc = false;
/*
* This driver uses fixed peripheral select mode (PS bit set to '0' in
* the Mode Register).
* So according to the datasheet, when FIFOs are available (and
* enabled), the Transmit FIFO operates in Multiple Data Mode.
* In this mode, up to 2 data, not 4, can be written into the Transmit
* Data Register in a single access.
* However, the first data has to be written into the lowest 16 bits and
* the second data into the highest 16 bits of the Transmit
* Data Register. For 8bit data (the most frequent case), it would
* require to rework tx_buf so each data would actualy fit 16 bits.
* So we'd rather write only one data at the time. Hence the transmit
* path works the same whether FIFOs are available (and enabled) or not.
*/
slave_config->direction = DMA_MEM_TO_DEV;
if (dmaengine_slave_config(as->dma.chan_tx, slave_config)) {
dev_err(&as->pdev->dev,
@ -413,6 +498,14 @@ static int atmel_spi_dma_slave_config(struct atmel_spi *as,
err = -EINVAL;
}
/*
* This driver configures the spi controller for master mode (MSTR bit
* set to '1' in the Mode Register).
* So according to the datasheet, when FIFOs are available (and
* enabled), the Receive FIFO operates in Single Data Mode.
* So the receive path works the same whether FIFOs are available (and
* enabled) or not.
*/
slave_config->direction = DMA_DEV_TO_MEM;
if (dmaengine_slave_config(as->dma.chan_rx, slave_config)) {
dev_err(&as->pdev->dev,
@ -502,10 +595,10 @@ static void dma_callback(void *data)
}
/*
* Next transfer using PIO.
* Next transfer using PIO without FIFO.
*/
static void atmel_spi_next_xfer_pio(struct spi_master *master,
struct spi_transfer *xfer)
static void atmel_spi_next_xfer_single(struct spi_master *master,
struct spi_transfer *xfer)
{
struct atmel_spi *as = spi_master_get_devdata(master);
unsigned long xfer_pos = xfer->len - as->current_remaining_bytes;
@ -537,6 +630,99 @@ static void atmel_spi_next_xfer_pio(struct spi_master *master,
spi_writel(as, IER, SPI_BIT(RDRF) | SPI_BIT(OVRES));
}
/*
* Next transfer using PIO with FIFO.
*/
static void atmel_spi_next_xfer_fifo(struct spi_master *master,
struct spi_transfer *xfer)
{
struct atmel_spi *as = spi_master_get_devdata(master);
u32 current_remaining_data, num_data;
u32 offset = xfer->len - as->current_remaining_bytes;
const u16 *words = (const u16 *)((u8 *)xfer->tx_buf + offset);
const u8 *bytes = (const u8 *)((u8 *)xfer->tx_buf + offset);
u16 td0, td1;
u32 fifomr;
dev_vdbg(master->dev.parent, "atmel_spi_next_xfer_fifo\n");
/* Compute the number of data to transfer in the current iteration */
current_remaining_data = ((xfer->bits_per_word > 8) ?
((u32)as->current_remaining_bytes >> 1) :
(u32)as->current_remaining_bytes);
num_data = min(current_remaining_data, as->fifo_size);
/* Flush RX and TX FIFOs */
spi_writel(as, CR, SPI_BIT(RXFCLR) | SPI_BIT(TXFCLR));
while (spi_readl(as, FLR))
cpu_relax();
/* Set RX FIFO Threshold to the number of data to transfer */
fifomr = spi_readl(as, FMR);
spi_writel(as, FMR, SPI_BFINS(RXFTHRES, num_data, fifomr));
/* Clear FIFO flags in the Status Register, especially RXFTHF */
(void)spi_readl(as, SR);
/* Fill TX FIFO */
while (num_data >= 2) {
if (xfer->tx_buf) {
if (xfer->bits_per_word > 8) {
td0 = *words++;
td1 = *words++;
} else {
td0 = *bytes++;
td1 = *bytes++;
}
} else {
td0 = 0;
td1 = 0;
}
spi_writel(as, TDR, (td1 << 16) | td0);
num_data -= 2;
}
if (num_data) {
if (xfer->tx_buf) {
if (xfer->bits_per_word > 8)
td0 = *words++;
else
td0 = *bytes++;
} else {
td0 = 0;
}
spi_writew(as, TDR, td0);
num_data--;
}
dev_dbg(master->dev.parent,
" start fifo xfer %p: len %u tx %p rx %p bitpw %d\n",
xfer, xfer->len, xfer->tx_buf, xfer->rx_buf,
xfer->bits_per_word);
/*
* Enable RX FIFO Threshold Flag interrupt to be notified about
* transfer completion.
*/
spi_writel(as, IER, SPI_BIT(RXFTHF) | SPI_BIT(OVRES));
}
/*
* Next transfer using PIO.
*/
static void atmel_spi_next_xfer_pio(struct spi_master *master,
struct spi_transfer *xfer)
{
struct atmel_spi *as = spi_master_get_devdata(master);
if (as->fifo_size)
atmel_spi_next_xfer_fifo(master, xfer);
else
atmel_spi_next_xfer_single(master, xfer);
}
/*
* Submit next transfer for DMA.
*/
@ -839,13 +1025,8 @@ static void atmel_spi_disable_pdc_transfer(struct atmel_spi *as)
spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
}
/* Called from IRQ
*
* Must update "current_remaining_bytes" to keep track of data
* to transfer.
*/
static void
atmel_spi_pump_pio_data(struct atmel_spi *as, struct spi_transfer *xfer)
atmel_spi_pump_single_data(struct atmel_spi *as, struct spi_transfer *xfer)
{
u8 *rxp;
u16 *rxp16;
@ -872,6 +1053,57 @@ atmel_spi_pump_pio_data(struct atmel_spi *as, struct spi_transfer *xfer)
}
}
static void
atmel_spi_pump_fifo_data(struct atmel_spi *as, struct spi_transfer *xfer)
{
u32 fifolr = spi_readl(as, FLR);
u32 num_bytes, num_data = SPI_BFEXT(RXFL, fifolr);
u32 offset = xfer->len - as->current_remaining_bytes;
u16 *words = (u16 *)((u8 *)xfer->rx_buf + offset);
u8 *bytes = (u8 *)((u8 *)xfer->rx_buf + offset);
u16 rd; /* RD field is the lowest 16 bits of RDR */
/* Update the number of remaining bytes to transfer */
num_bytes = ((xfer->bits_per_word > 8) ?
(num_data << 1) :
num_data);
if (as->current_remaining_bytes > num_bytes)
as->current_remaining_bytes -= num_bytes;
else
as->current_remaining_bytes = 0;
/* Handle odd number of bytes when data are more than 8bit width */
if (xfer->bits_per_word > 8)
as->current_remaining_bytes &= ~0x1;
/* Read data */
while (num_data) {
rd = spi_readl(as, RDR);
if (xfer->rx_buf) {
if (xfer->bits_per_word > 8)
*words++ = rd;
else
*bytes++ = rd;
}
num_data--;
}
}
/* Called from IRQ
*
* Must update "current_remaining_bytes" to keep track of data
* to transfer.
*/
static void
atmel_spi_pump_pio_data(struct atmel_spi *as, struct spi_transfer *xfer)
{
if (as->fifo_size)
atmel_spi_pump_fifo_data(as, xfer);
else
atmel_spi_pump_single_data(as, xfer);
}
/* Interrupt
*
* No need for locking in this Interrupt handler: done_status is the
@ -912,7 +1144,7 @@ atmel_spi_pio_interrupt(int irq, void *dev_id)
complete(&as->xfer_completion);
} else if (pending & SPI_BIT(RDRF)) {
} else if (pending & (SPI_BIT(RDRF) | SPI_BIT(RXFTHF))) {
atmel_spi_lock(as);
if (as->current_remaining_bytes) {
@ -996,6 +1228,8 @@ static int atmel_spi_setup(struct spi_device *spi)
csr |= SPI_BIT(CPOL);
if (!(spi->mode & SPI_CPHA))
csr |= SPI_BIT(NCPHA);
if (!as->use_cs_gpios)
csr |= SPI_BIT(CSAAT);
/* DLYBS is mostly irrelevant since we manage chipselect using GPIOs.
*
@ -1009,7 +1243,9 @@ static int atmel_spi_setup(struct spi_device *spi)
/* chipselect must have been muxed as GPIO (e.g. in board setup) */
npcs_pin = (unsigned long)spi->controller_data;
if (gpio_is_valid(spi->cs_gpio))
if (!as->use_cs_gpios)
npcs_pin = spi->chip_select;
else if (gpio_is_valid(spi->cs_gpio))
npcs_pin = spi->cs_gpio;
asd = spi->controller_state;
@ -1018,15 +1254,19 @@ static int atmel_spi_setup(struct spi_device *spi)
if (!asd)
return -ENOMEM;
ret = gpio_request(npcs_pin, dev_name(&spi->dev));
if (ret) {
kfree(asd);
return ret;
if (as->use_cs_gpios) {
ret = gpio_request(npcs_pin, dev_name(&spi->dev));
if (ret) {
kfree(asd);
return ret;
}
gpio_direction_output(npcs_pin,
!(spi->mode & SPI_CS_HIGH));
}
asd->npcs_pin = npcs_pin;
spi->controller_state = asd;
gpio_direction_output(npcs_pin, !(spi->mode & SPI_CS_HIGH));
}
asd->csr = csr;
@ -1338,6 +1578,13 @@ static int atmel_spi_probe(struct platform_device *pdev)
atmel_get_caps(as);
as->use_cs_gpios = true;
if (atmel_spi_is_v2(as) &&
!of_get_property(pdev->dev.of_node, "cs-gpios", NULL)) {
as->use_cs_gpios = false;
master->num_chipselect = 4;
}
as->use_dma = false;
as->use_pdc = false;
if (as->caps.has_dma_support) {
@ -1380,6 +1627,13 @@ static int atmel_spi_probe(struct platform_device *pdev)
spi_writel(as, PTCR, SPI_BIT(RXTDIS) | SPI_BIT(TXTDIS));
spi_writel(as, CR, SPI_BIT(SPIEN));
as->fifo_size = 0;
if (!of_property_read_u32(pdev->dev.of_node, "atmel,fifo-size",
&as->fifo_size)) {
dev_info(&pdev->dev, "Using FIFO (%u data)\n", as->fifo_size);
spi_writel(as, CR, SPI_BIT(FIFOEN));
}
/* go! */
dev_info(&pdev->dev, "Atmel SPI Controller at 0x%08lx (irq %d)\n",
(unsigned long)regs->start, irq);

392
drivers/spi/spi-bcm2835.c
View File

@ -20,18 +20,22 @@
* GNU General Public License for more details.
*/
#include <asm/page.h>
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/dmaengine.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_irq.h>
#include <linux/of_gpio.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
#include <linux/of_gpio.h>
#include <linux/of_irq.h>
#include <linux/spi/spi.h>
/* SPI register offsets */
@ -69,7 +73,8 @@
#define BCM2835_SPI_CS_CS_01 0x00000001
#define BCM2835_SPI_POLLING_LIMIT_US 30
#define BCM2835_SPI_TIMEOUT_MS 30000
#define BCM2835_SPI_POLLING_JIFFIES 2
#define BCM2835_SPI_DMA_MIN_LENGTH 96
#define BCM2835_SPI_MODE_BITS (SPI_CPOL | SPI_CPHA | SPI_CS_HIGH \
| SPI_NO_CS | SPI_3WIRE)
@ -83,6 +88,7 @@ struct bcm2835_spi {
u8 *rx_buf;
int tx_len;
int rx_len;
bool dma_pending;
};
static inline u32 bcm2835_rd(struct bcm2835_spi *bs, unsigned reg)
@ -128,12 +134,15 @@ static void bcm2835_spi_reset_hw(struct spi_master *master)
/* Disable SPI interrupts and transfer */
cs &= ~(BCM2835_SPI_CS_INTR |
BCM2835_SPI_CS_INTD |
BCM2835_SPI_CS_DMAEN |
BCM2835_SPI_CS_TA);
/* and reset RX/TX FIFOS */
cs |= BCM2835_SPI_CS_CLEAR_RX | BCM2835_SPI_CS_CLEAR_TX;
/* and reset the SPI_HW */
bcm2835_wr(bs, BCM2835_SPI_CS, cs);
/* as well as DLEN */
bcm2835_wr(bs, BCM2835_SPI_DLEN, 0);
}
static irqreturn_t bcm2835_spi_interrupt(int irq, void *dev_id)
@ -157,42 +166,6 @@ static irqreturn_t bcm2835_spi_interrupt(int irq, void *dev_id)
return IRQ_HANDLED;
}
static int bcm2835_spi_transfer_one_poll(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *tfr,
u32 cs,
unsigned long xfer_time_us)
{
struct bcm2835_spi *bs = spi_master_get_devdata(master);
/* set timeout to 1 second of maximum polling */
unsigned long timeout = jiffies + HZ;
/* enable HW block without interrupts */
bcm2835_wr(bs, BCM2835_SPI_CS, cs | BCM2835_SPI_CS_TA);
/* loop until finished the transfer */
while (bs->rx_len) {
/* read from fifo as much as possible */
bcm2835_rd_fifo(bs);
/* fill in tx fifo as much as possible */
bcm2835_wr_fifo(bs);
/* if we still expect some data after the read,
* check for a possible timeout
*/
if (bs->rx_len && time_after(jiffies, timeout)) {
/* Transfer complete - reset SPI HW */
bcm2835_spi_reset_hw(master);
/* and return timeout */
return -ETIMEDOUT;
}
}
/* Transfer complete - reset SPI HW */
bcm2835_spi_reset_hw(master);
/* and return without waiting for completion */
return 0;
}
static int bcm2835_spi_transfer_one_irq(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *tfr,
@ -229,6 +202,329 @@ static int bcm2835_spi_transfer_one_irq(struct spi_master *master,
return 1;
}
/*
* DMA support
*
* this implementation has currently a few issues in so far as it does
* not work arrount limitations of the HW.
*
* the main one being that DMA transfers are limited to 16 bit
* (so 0 to 65535 bytes) by the SPI HW due to BCM2835_SPI_DLEN
*
* also we currently assume that the scatter-gather fragments are
* all multiple of 4 (except the last) - otherwise we would need
* to reset the FIFO before subsequent transfers...
* this also means that tx/rx transfers sg's need to be of equal size!
*
* there may be a few more border-cases we may need to address as well
* but unfortunately this would mean splitting up the scatter-gather
* list making it slightly unpractical...
*/
static void bcm2835_spi_dma_done(void *data)
{
struct spi_master *master = data;
struct bcm2835_spi *bs = spi_master_get_devdata(master);
/* reset fifo and HW */
bcm2835_spi_reset_hw(master);
/* and terminate tx-dma as we do not have an irq for it
* because when the rx dma will terminate and this callback
* is called the tx-dma must have finished - can't get to this
* situation otherwise...
*/
dmaengine_terminate_all(master->dma_tx);
/* mark as no longer pending */
bs->dma_pending = 0;
/* and mark as completed */;
complete(&master->xfer_completion);
}
static int bcm2835_spi_prepare_sg(struct spi_master *master,
struct spi_transfer *tfr,
bool is_tx)
{
struct dma_chan *chan;
struct scatterlist *sgl;
unsigned int nents;
enum dma_transfer_direction dir;
unsigned long flags;
struct dma_async_tx_descriptor *desc;
dma_cookie_t cookie;
if (is_tx) {
dir = DMA_MEM_TO_DEV;
chan = master->dma_tx;
nents = tfr->tx_sg.nents;
sgl = tfr->tx_sg.sgl;
flags = 0 /* no tx interrupt */;
} else {
dir = DMA_DEV_TO_MEM;
chan = master->dma_rx;
nents = tfr->rx_sg.nents;
sgl = tfr->rx_sg.sgl;
flags = DMA_PREP_INTERRUPT;
}
/* prepare the channel */
desc = dmaengine_prep_slave_sg(chan, sgl, nents, dir, flags);
if (!desc)
return -EINVAL;
/* set callback for rx */
if (!is_tx) {
desc->callback = bcm2835_spi_dma_done;
desc->callback_param = master;
}
/* submit it to DMA-engine */
cookie = dmaengine_submit(desc);
return dma_submit_error(cookie);
}
static inline int bcm2835_check_sg_length(struct sg_table *sgt)
{
int i;
struct scatterlist *sgl;
/* check that the sg entries are word-sized (except for last) */
for_each_sg(sgt->sgl, sgl, (int)sgt->nents - 1, i) {
if (sg_dma_len(sgl) % 4)
return -EFAULT;
}
return 0;
}
static int bcm2835_spi_transfer_one_dma(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *tfr,
u32 cs)
{
struct bcm2835_spi *bs = spi_master_get_devdata(master);
int ret;
/* check that the scatter gather segments are all a multiple of 4 */
if (bcm2835_check_sg_length(&tfr->tx_sg) ||
bcm2835_check_sg_length(&tfr->rx_sg)) {
dev_warn_once(&spi->dev,
"scatter gather segment length is not a multiple of 4 - falling back to interrupt mode\n");
return bcm2835_spi_transfer_one_irq(master, spi, tfr, cs);
}
/* setup tx-DMA */
ret = bcm2835_spi_prepare_sg(master, tfr, true);
if (ret)
return ret;
/* start TX early */
dma_async_issue_pending(master->dma_tx);
/* mark as dma pending */
bs->dma_pending = 1;
/* set the DMA length */
bcm2835_wr(bs, BCM2835_SPI_DLEN, tfr->len);
/* start the HW */
bcm2835_wr(bs, BCM2835_SPI_CS,
cs | BCM2835_SPI_CS_TA | BCM2835_SPI_CS_DMAEN);
/* setup rx-DMA late - to run transfers while
* mapping of the rx buffers still takes place
* this saves 10us or more.
*/
ret = bcm2835_spi_prepare_sg(master, tfr, false);
if (ret) {
/* need to reset on errors */
dmaengine_terminate_all(master->dma_tx);
bcm2835_spi_reset_hw(master);
return ret;
}
/* start rx dma late */
dma_async_issue_pending(master->dma_rx);
/* wait for wakeup in framework */
return 1;
}
static bool bcm2835_spi_can_dma(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *tfr)
{
/* only run for gpio_cs */
if (!gpio_is_valid(spi->cs_gpio))
return false;
/* we start DMA efforts only on bigger transfers */
if (tfr->len < BCM2835_SPI_DMA_MIN_LENGTH)
return false;
/* BCM2835_SPI_DLEN has defined a max transfer size as
* 16 bit, so max is 65535
* we can revisit this by using an alternative transfer
* method - ideally this would get done without any more
* interaction...
*/
if (tfr->len > 65535) {
dev_warn_once(&spi->dev,
"transfer size of %d too big for dma-transfer\n",
tfr->len);
return false;
}
/* if we run rx/tx_buf with word aligned addresses then we are OK */
if ((((size_t)tfr->rx_buf & 3) == 0) &&
(((size_t)tfr->tx_buf & 3) == 0))
return true;
/* otherwise we only allow transfers within the same page
* to avoid wasting time on dma_mapping when it is not practical
*/
if (((size_t)tfr->tx_buf & PAGE_MASK) + tfr->len > PAGE_SIZE) {
dev_warn_once(&spi->dev,
"Unaligned spi tx-transfer bridging page\n");
return false;
}
if (((size_t)tfr->rx_buf & PAGE_MASK) + tfr->len > PAGE_SIZE) {
dev_warn_once(&spi->dev,
"Unaligned spi tx-transfer bridging page\n");
return false;
}
/* return OK */
return true;
}
static void bcm2835_dma_release(struct spi_master *master)
{
if (master->dma_tx) {
dmaengine_terminate_all(master->dma_tx);
dma_release_channel(master->dma_tx);
master->dma_tx = NULL;
}
if (master->dma_rx) {
dmaengine_terminate_all(master->dma_rx);
dma_release_channel(master->dma_rx);
master->dma_rx = NULL;
}
}
static void bcm2835_dma_init(struct spi_master *master, struct device *dev)
{
struct dma_slave_config slave_config;
const __be32 *addr;
dma_addr_t dma_reg_base;
int ret;
/* base address in dma-space */
addr = of_get_address(master->dev.of_node, 0, NULL, NULL);
if (!addr) {
dev_err(dev, "could not get DMA-register address - not using dma mode\n");
goto err;
}
dma_reg_base = be32_to_cpup(addr);
/* get tx/rx dma */
master->dma_tx = dma_request_slave_channel(dev, "tx");
if (!master->dma_tx) {
dev_err(dev, "no tx-dma configuration found - not using dma mode\n");
goto err;
}
master->dma_rx = dma_request_slave_channel(dev, "rx");
if (!master->dma_rx) {
dev_err(dev, "no rx-dma configuration found - not using dma mode\n");
goto err_release;
}
/* configure DMAs */
slave_config.direction = DMA_MEM_TO_DEV;
slave_config.dst_addr = (u32)(dma_reg_base + BCM2835_SPI_FIFO);
slave_config.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
ret = dmaengine_slave_config(master->dma_tx, &slave_config);
if (ret)
goto err_config;
slave_config.direction = DMA_DEV_TO_MEM;
slave_config.src_addr = (u32)(dma_reg_base + BCM2835_SPI_FIFO);
slave_config.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
ret = dmaengine_slave_config(master->dma_rx, &slave_config);
if (ret)
goto err_config;
/* all went well, so set can_dma */
master->can_dma = bcm2835_spi_can_dma;
master->max_dma_len = 65535; /* limitation by BCM2835_SPI_DLEN */
/* need to do TX AND RX DMA, so we need dummy buffers */
master->flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX;
return;
err_config:
dev_err(dev, "issue configuring dma: %d - not using DMA mode\n",
ret);
err_release:
bcm2835_dma_release(master);
err:
return;
}
static int bcm2835_spi_transfer_one_poll(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *tfr,
u32 cs,
unsigned long xfer_time_us)
{
struct bcm2835_spi *bs = spi_master_get_devdata(master);
unsigned long timeout;
/* enable HW block without interrupts */
bcm2835_wr(bs, BCM2835_SPI_CS, cs | BCM2835_SPI_CS_TA);
/* fill in the fifo before timeout calculations
* if we are interrupted here, then the data is
* getting transferred by the HW while we are interrupted
*/
bcm2835_wr_fifo(bs);
/* set the timeout */
timeout = jiffies + BCM2835_SPI_POLLING_JIFFIES;
/* loop until finished the transfer */
while (bs->rx_len) {
/* fill in tx fifo with remaining data */
bcm2835_wr_fifo(bs);
/* read from fifo as much as possible */
bcm2835_rd_fifo(bs);
/* if there is still data pending to read
* then check the timeout
*/
if (bs->rx_len && time_after(jiffies, timeout)) {
dev_dbg_ratelimited(&spi->dev,
"timeout period reached: jiffies: %lu remaining tx/rx: %d/%d - falling back to interrupt mode\n",
jiffies - timeout,
bs->tx_len, bs->rx_len);
/* fall back to interrupt mode */
return bcm2835_spi_transfer_one_irq(master, spi,
tfr, cs);
}
}
/* Transfer complete - reset SPI HW */
bcm2835_spi_reset_hw(master);
/* and return without waiting for completion */
return 0;
}
static int bcm2835_spi_transfer_one(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *tfr)
@ -288,12 +584,26 @@ static int bcm2835_spi_transfer_one(struct spi_master *master,
return bcm2835_spi_transfer_one_poll(master, spi, tfr,
cs, xfer_time_us);
/* run in dma mode if conditions are right */
if (master->can_dma && bcm2835_spi_can_dma(master, spi, tfr))
return bcm2835_spi_transfer_one_dma(master, spi, tfr, cs);
/* run in interrupt-mode */
return bcm2835_spi_transfer_one_irq(master, spi, tfr, cs);
}
static void bcm2835_spi_handle_err(struct spi_master *master,
struct spi_message *msg)
{
struct bcm2835_spi *bs = spi_master_get_devdata(master);
/* if an error occurred and we have an active dma, then terminate */
if (bs->dma_pending) {
dmaengine_terminate_all(master->dma_tx);
dmaengine_terminate_all(master->dma_rx);
bs->dma_pending = 0;
}
/* and reset */
bcm2835_spi_reset_hw(master);
}
@ -463,6 +773,8 @@ static int bcm2835_spi_probe(struct platform_device *pdev)
goto out_clk_disable;
}
bcm2835_dma_init(master, &pdev->dev);
/* initialise the hardware with the default polarities */
bcm2835_wr(bs, BCM2835_SPI_CS,
BCM2835_SPI_CS_CLEAR_RX | BCM2835_SPI_CS_CLEAR_TX);
@ -493,6 +805,8 @@ static int bcm2835_spi_remove(struct platform_device *pdev)
clk_disable_unprepare(bs->clk);
bcm2835_dma_release(master);
return 0;
}

2
drivers/spi/spi-davinci.c
View File

@ -265,7 +265,7 @@ static inline int davinci_spi_get_prescale(struct davinci_spi *dspi,
ret = DIV_ROUND_UP(clk_get_rate(dspi->clk), max_speed_hz);
if (ret < 3 || ret > 256)
if (ret < 1 || ret > 256)
return -EINVAL;
return ret - 1;

315
drivers/spi/spi-fsl-dspi.c
View File

@ -24,6 +24,7 @@
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/regmap.h>
@ -47,6 +48,7 @@
#define SPI_MCR_CLR_RXF (1 << 10)
#define SPI_TCR 0x08
#define SPI_TCR_GET_TCNT(x) (((x) & 0xffff0000) >> 16)
#define SPI_CTAR(x) (0x0c + (((x) & 0x3) * 4))
#define SPI_CTAR_FMSZ(x) (((x) & 0x0000000f) << 27)
@ -67,9 +69,11 @@
#define SPI_SR 0x2c
#define SPI_SR_EOQF 0x10000000
#define SPI_SR_TCFQF 0x80000000
#define SPI_RSER 0x30
#define SPI_RSER_EOQFE 0x10000000
#define SPI_RSER_TCFQE 0x80000000
#define SPI_PUSHR 0x34
#define SPI_PUSHR_CONT (1 << 31)
@ -102,12 +106,35 @@
#define SPI_CS_ASSERT 0x02
#define SPI_CS_DROP 0x04
#define SPI_TCR_TCNT_MAX 0x10000
struct chip_data {
u32 mcr_val;
u32 ctar_val;
u16 void_write_data;
};
enum dspi_trans_mode {
DSPI_EOQ_MODE = 0,
DSPI_TCFQ_MODE,
};
struct fsl_dspi_devtype_data {
enum dspi_trans_mode trans_mode;
};
static const struct fsl_dspi_devtype_data vf610_data = {
.trans_mode = DSPI_EOQ_MODE,
};
static const struct fsl_dspi_devtype_data ls1021a_v1_data = {
.trans_mode = DSPI_TCFQ_MODE,
};
static const struct fsl_dspi_devtype_data ls2085a_data = {
.trans_mode = DSPI_TCFQ_MODE,
};
struct fsl_dspi {
struct spi_master *master;
struct platform_device *pdev;
@ -128,9 +155,12 @@ struct fsl_dspi {
u8 cs;
u16 void_write_data;
u32 cs_change;
struct fsl_dspi_devtype_data *devtype_data;
wait_queue_head_t waitq;
u32 waitflags;
u32 spi_tcnt;
};
static inline int is_double_byte_mode(struct fsl_dspi *dspi)
@ -213,63 +243,60 @@ static void ns_delay_scale(char *psc, char *sc, int delay_ns,
}
}
static int dspi_transfer_write(struct fsl_dspi *dspi)
static u32 dspi_data_to_pushr(struct fsl_dspi *dspi, int tx_word)
{
u16 d16;
if (!(dspi->dataflags & TRAN_STATE_TX_VOID))
d16 = tx_word ? *(u16 *)dspi->tx : *(u8 *)dspi->tx;
else
d16 = dspi->void_write_data;
dspi->tx += tx_word + 1;
dspi->len -= tx_word + 1;
return SPI_PUSHR_TXDATA(d16) |
SPI_PUSHR_PCS(dspi->cs) |
SPI_PUSHR_CTAS(dspi->cs) |
SPI_PUSHR_CONT;
}
static void dspi_data_from_popr(struct fsl_dspi *dspi, int rx_word)
{
u16 d;
unsigned int val;
regmap_read(dspi->regmap, SPI_POPR, &val);
d = SPI_POPR_RXDATA(val);
if (!(dspi->dataflags & TRAN_STATE_RX_VOID))
rx_word ? (*(u16 *)dspi->rx = d) : (*(u8 *)dspi->rx = d);
dspi->rx += rx_word + 1;
}
static int dspi_eoq_write(struct fsl_dspi *dspi)
{
int tx_count = 0;
int tx_word;
u16 d16;
u8 d8;
u32 dspi_pushr = 0;
int first = 1;
tx_word = is_double_byte_mode(dspi);
/* If we are in word mode, but only have a single byte to transfer
* then switch to byte mode temporarily. Will switch back at the
* end of the transfer.
*/
if (tx_word && (dspi->len == 1)) {
dspi->dataflags |= TRAN_STATE_WORD_ODD_NUM;
regmap_update_bits(dspi->regmap, SPI_CTAR(dspi->cs),
SPI_FRAME_BITS_MASK, SPI_FRAME_BITS(8));
tx_word = 0;
}
while (dspi->len && (tx_count < DSPI_FIFO_SIZE)) {
if (tx_word) {
if (dspi->len == 1)
break;
if (!(dspi->dataflags & TRAN_STATE_TX_VOID)) {
d16 = *(u16 *)dspi->tx;
dspi->tx += 2;
} else {
d16 = dspi->void_write_data;
}
dspi_pushr = SPI_PUSHR_TXDATA(d16) |
SPI_PUSHR_PCS(dspi->cs) |
SPI_PUSHR_CTAS(dspi->cs) |
SPI_PUSHR_CONT;
dspi->len -= 2;
} else {
if (!(dspi->dataflags & TRAN_STATE_TX_VOID)) {
d8 = *(u8 *)dspi->tx;
dspi->tx++;
} else {
d8 = (u8)dspi->void_write_data;
}
dspi_pushr = SPI_PUSHR_TXDATA(d8) |
SPI_PUSHR_PCS(dspi->cs) |
SPI_PUSHR_CTAS(dspi->cs) |
SPI_PUSHR_CONT;
dspi->len--;
/* If we are in word mode, only have a single byte to transfer
* switch to byte mode temporarily. Will switch back at the
* end of the transfer.
*/
if (tx_word && (dspi->len == 1)) {
dspi->dataflags |= TRAN_STATE_WORD_ODD_NUM;
regmap_update_bits(dspi->regmap, SPI_CTAR(dspi->cs),
SPI_FRAME_BITS_MASK, SPI_FRAME_BITS(8));
tx_word = 0;
}
dspi_pushr = dspi_data_to_pushr(dspi, tx_word);
if (dspi->len == 0 || tx_count == DSPI_FIFO_SIZE - 1) {
/* last transfer in the transfer */
dspi_pushr |= SPI_PUSHR_EOQ;
@ -278,11 +305,6 @@ static int dspi_transfer_write(struct fsl_dspi *dspi)
} else if (tx_word && (dspi->len == 1))
dspi_pushr |= SPI_PUSHR_EOQ;
if (first) {
first = 0;
dspi_pushr |= SPI_PUSHR_CTCNT; /* clear counter */
}
regmap_write(dspi->regmap, SPI_PUSHR, dspi_pushr);
tx_count++;
@ -291,42 +313,57 @@ static int dspi_transfer_write(struct fsl_dspi *dspi)
return tx_count * (tx_word + 1);
}
static int dspi_transfer_read(struct fsl_dspi *dspi)
static int dspi_eoq_read(struct fsl_dspi *dspi)
{
int rx_count = 0;
int rx_word = is_double_byte_mode(dspi);
u16 d;
while ((dspi->rx < dspi->rx_end)
&& (rx_count < DSPI_FIFO_SIZE)) {
if (rx_word) {
unsigned int val;
if (rx_word && (dspi->rx_end - dspi->rx) == 1)
rx_word = 0;
if ((dspi->rx_end - dspi->rx) == 1)
break;
regmap_read(dspi->regmap, SPI_POPR, &val);
d = SPI_POPR_RXDATA(val);
if (!(dspi->dataflags & TRAN_STATE_RX_VOID))
*(u16 *)dspi->rx = d;
dspi->rx += 2;
} else {
unsigned int val;
regmap_read(dspi->regmap, SPI_POPR, &val);
d = SPI_POPR_RXDATA(val);
if (!(dspi->dataflags & TRAN_STATE_RX_VOID))
*(u8 *)dspi->rx = d;
dspi->rx++;
}
dspi_data_from_popr(dspi, rx_word);
rx_count++;
}
return rx_count;
}
static int dspi_tcfq_write(struct fsl_dspi *dspi)
{
int tx_word;
u32 dspi_pushr = 0;
tx_word = is_double_byte_mode(dspi);
if (tx_word && (dspi->len == 1)) {
dspi->dataflags |= TRAN_STATE_WORD_ODD_NUM;
regmap_update_bits(dspi->regmap, SPI_CTAR(dspi->cs),
SPI_FRAME_BITS_MASK, SPI_FRAME_BITS(8));
tx_word = 0;
}
dspi_pushr = dspi_data_to_pushr(dspi, tx_word);
if ((dspi->cs_change) && (!dspi->len))
dspi_pushr &= ~SPI_PUSHR_CONT;
regmap_write(dspi->regmap, SPI_PUSHR, dspi_pushr);
return tx_word + 1;
}
static void dspi_tcfq_read(struct fsl_dspi *dspi)
{
int rx_word = is_double_byte_mode(dspi);
if (rx_word && (dspi->rx_end - dspi->rx) == 1)
rx_word = 0;
dspi_data_from_popr(dspi, rx_word);
}
static int dspi_transfer_one_message(struct spi_master *master,
struct spi_message *message)
{
@ -334,6 +371,12 @@ static int dspi_transfer_one_message(struct spi_master *master,
struct spi_device *spi = message->spi;
struct spi_transfer *transfer;
int status = 0;
enum dspi_trans_mode trans_mode;
u32 spi_tcr;
regmap_read(dspi->regmap, SPI_TCR, &spi_tcr);
dspi->spi_tcnt = SPI_TCR_GET_TCNT(spi_tcr);
message->actual_length = 0;
list_for_each_entry(transfer, &message->transfers, transfer_list) {
@ -341,10 +384,10 @@ static int dspi_transfer_one_message(struct spi_master *master,
dspi->cur_msg = message;
dspi->cur_chip = spi_get_ctldata(spi);
dspi->cs = spi->chip_select;
dspi->cs_change = 0;
if (dspi->cur_transfer->transfer_list.next
== &dspi->cur_msg->transfers)
transfer->cs_change = 1;
dspi->cs_change = transfer->cs_change;
dspi->cs_change = 1;
dspi->void_write_data = dspi->cur_chip->void_write_data;
dspi->dataflags = 0;
@ -370,8 +413,22 @@ static int dspi_transfer_one_message(struct spi_master *master,
regmap_write(dspi->regmap, SPI_CTAR(dspi->cs),
dspi->cur_chip->ctar_val);
regmap_write(dspi->regmap, SPI_RSER, SPI_RSER_EOQFE);
message->actual_length += dspi_transfer_write(dspi);
trans_mode = dspi->devtype_data->trans_mode;
switch (trans_mode) {
case DSPI_EOQ_MODE:
regmap_write(dspi->regmap, SPI_RSER, SPI_RSER_EOQFE);
dspi_eoq_write(dspi);
break;
case DSPI_TCFQ_MODE:
regmap_write(dspi->regmap, SPI_RSER, SPI_RSER_TCFQE);
dspi_tcfq_write(dspi);
break;
default:
dev_err(&dspi->pdev->dev, "unsupported trans_mode %u\n",
trans_mode);
status = -EINVAL;
goto out;
}
if (wait_event_interruptible(dspi->waitq, dspi->waitflags))
dev_err(&dspi->pdev->dev, "wait transfer complete fail!\n");
@ -381,6 +438,7 @@ static int dspi_transfer_one_message(struct spi_master *master,
udelay(transfer->delay_usecs);
}
out:
message->status = status;
spi_finalize_current_message(master);
@ -460,27 +518,89 @@ static void dspi_cleanup(struct spi_device *spi)
static irqreturn_t dspi_interrupt(int irq, void *dev_id)
{
struct fsl_dspi *dspi = (struct fsl_dspi *)dev_id;
struct spi_message *msg = dspi->cur_msg;
enum dspi_trans_mode trans_mode;
u32 spi_sr, spi_tcr;
u32 spi_tcnt, tcnt_diff;
int tx_word;
regmap_write(dspi->regmap, SPI_SR, SPI_SR_EOQF);
dspi_transfer_read(dspi);
regmap_read(dspi->regmap, SPI_SR, &spi_sr);
regmap_write(dspi->regmap, SPI_SR, spi_sr);
if (!dspi->len) {
if (spi_sr & (SPI_SR_EOQF | SPI_SR_TCFQF)) {
tx_word = is_double_byte_mode(dspi);
regmap_read(dspi->regmap, SPI_TCR, &spi_tcr);
spi_tcnt = SPI_TCR_GET_TCNT(spi_tcr);
/*
* The width of SPI Transfer Counter in SPI_TCR is 16bits,
* so the max couner is 65535. When the counter reach 65535,
* it will wrap around, counter reset to zero.
* spi_tcnt my be less than dspi->spi_tcnt, it means the
* counter already wrapped around.
* SPI Transfer Counter is a counter of transmitted frames.
* The size of frame maybe two bytes.
*/
tcnt_diff = ((spi_tcnt + SPI_TCR_TCNT_MAX) - dspi->spi_tcnt)
% SPI_TCR_TCNT_MAX;
tcnt_diff *= (tx_word + 1);
if (dspi->dataflags & TRAN_STATE_WORD_ODD_NUM)
regmap_update_bits(dspi->regmap, SPI_CTAR(dspi->cs),
SPI_FRAME_BITS_MASK, SPI_FRAME_BITS(16));
tcnt_diff--;
dspi->waitflags = 1;
wake_up_interruptible(&dspi->waitq);
} else
msg->actual_length += dspi_transfer_write(dspi);
msg->actual_length += tcnt_diff;
dspi->spi_tcnt = spi_tcnt;
trans_mode = dspi->devtype_data->trans_mode;
switch (trans_mode) {
case DSPI_EOQ_MODE:
dspi_eoq_read(dspi);
break;
case DSPI_TCFQ_MODE:
dspi_tcfq_read(dspi);
break;
default:
dev_err(&dspi->pdev->dev, "unsupported trans_mode %u\n",
trans_mode);
return IRQ_HANDLED;
}
if (!dspi->len) {
if (dspi->dataflags & TRAN_STATE_WORD_ODD_NUM) {
regmap_update_bits(dspi->regmap,
SPI_CTAR(dspi->cs),
SPI_FRAME_BITS_MASK,
SPI_FRAME_BITS(16));
dspi->dataflags &= ~TRAN_STATE_WORD_ODD_NUM;
}
dspi->waitflags = 1;
wake_up_interruptible(&dspi->waitq);
} else {
switch (trans_mode) {
case DSPI_EOQ_MODE:
dspi_eoq_write(dspi);
break;
case DSPI_TCFQ_MODE:
dspi_tcfq_write(dspi);
break;
default:
dev_err(&dspi->pdev->dev,
"unsupported trans_mode %u\n",
trans_mode);
}
}
}
return IRQ_HANDLED;
}
static const struct of_device_id fsl_dspi_dt_ids[] = {
{ .compatible = "fsl,vf610-dspi", .data = NULL, },
{ .compatible = "fsl,vf610-dspi", .data = (void *)&vf610_data, },
{ .compatible = "fsl,ls1021a-v1.0-dspi",
.data = (void *)&ls1021a_v1_data, },
{ .compatible = "fsl,ls2085a-dspi", .data = (void *)&ls2085a_data, },
{ /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, fsl_dspi_dt_ids);
@ -494,6 +614,8 @@ static int dspi_suspend(struct device *dev)
spi_master_suspend(master);
clk_disable_unprepare(dspi->clk);
pinctrl_pm_select_sleep_state(dev);
return 0;
}
@ -502,6 +624,8 @@ static int dspi_resume(struct device *dev)
struct spi_master *master = dev_get_drvdata(dev);
struct fsl_dspi *dspi = spi_master_get_devdata(master);
pinctrl_pm_select_default_state(dev);
clk_prepare_enable(dspi->clk);
spi_master_resume(master);
@ -526,6 +650,8 @@ static int dspi_probe(struct platform_device *pdev)
struct resource *res;
void __iomem *base;
int ret = 0, cs_num, bus_num;
const struct of_device_id *of_id =
of_match_device(fsl_dspi_dt_ids, &pdev->dev);
master = spi_alloc_master(&pdev->dev, sizeof(struct fsl_dspi));
if (!master)
@ -559,6 +685,13 @@ static int dspi_probe(struct platform_device *pdev)
}
master->bus_num = bus_num;
dspi->devtype_data = (struct fsl_dspi_devtype_data *)of_id->data;
if (!dspi->devtype_data) {
dev_err(&pdev->dev, "can't get devtype_data\n");
ret = -EFAULT;
goto out_master_put;
}
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(base)) {
@ -566,7 +699,7 @@ static int dspi_probe(struct platform_device *pdev)
goto out_master_put;
}
dspi->regmap = devm_regmap_init_mmio_clk(&pdev->dev, "dspi", base,
dspi->regmap = devm_regmap_init_mmio_clk(&pdev->dev, NULL, base,
&dspi_regmap_config);
if (IS_ERR(dspi->regmap)) {
dev_err(&pdev->dev, "failed to init regmap: %ld\n",

6
drivers/spi/spi-fsl-espi.c
View File

@ -561,9 +561,13 @@ void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events)
/* spin until TX is done */
ret = spin_event_timeout(((events = mpc8xxx_spi_read_reg(
&reg_base->event)) & SPIE_NF) == 0, 1000, 0);
&reg_base->event)) & SPIE_NF), 1000, 0);
if (!ret) {
dev_err(mspi->dev, "tired waiting for SPIE_NF\n");
/* Clear the SPIE bits */
mpc8xxx_spi_write_reg(&reg_base->event, events);
complete(&mspi->done);
return;
}
}

2
drivers/spi/spi-imx.c
View File

@ -674,7 +674,7 @@ static struct spi_imx_devtype_data imx51_ecspi_devtype_data = {
.devtype = IMX51_ECSPI,
};
static struct platform_device_id spi_imx_devtype[] = {
static const struct platform_device_id spi_imx_devtype[] = {
{
.name = "imx1-cspi",
.driver_data = (kernel_ulong_t) &imx1_cspi_devtype_data,

300
drivers/spi/spi-omap2-mcspi.c
View File

@ -35,6 +35,7 @@
#include <linux/gcd.h>
#include <linux/spi/spi.h>
#include <linux/gpio.h>
#include <linux/platform_data/spi-omap2-mcspi.h>
@ -242,17 +243,27 @@ static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable)
mcspi_read_cs_reg(spi, OMAP2_MCSPI_CHCTRL0);
}
static void omap2_mcspi_force_cs(struct spi_device *spi, int cs_active)
static void omap2_mcspi_set_cs(struct spi_device *spi, bool enable)
{
u32 l;
l = mcspi_cached_chconf0(spi);
if (cs_active)
l |= OMAP2_MCSPI_CHCONF_FORCE;
else
l &= ~OMAP2_MCSPI_CHCONF_FORCE;
/* The controller handles the inverted chip selects
* using the OMAP2_MCSPI_CHCONF_EPOL bit so revert
* the inversion from the core spi_set_cs function.
*/
if (spi->mode & SPI_CS_HIGH)
enable = !enable;
mcspi_write_chconf0(spi, l);
if (spi->controller_state) {
l = mcspi_cached_chconf0(spi);
if (enable)
l &= ~OMAP2_MCSPI_CHCONF_FORCE;
else
l |= OMAP2_MCSPI_CHCONF_FORCE;
mcspi_write_chconf0(spi, l);
}
}
static void omap2_mcspi_set_master_mode(struct spi_master *master)
@ -1011,6 +1022,15 @@ static int omap2_mcspi_setup(struct spi_device *spi)
return ret;
}
if (gpio_is_valid(spi->cs_gpio)) {
ret = gpio_request(spi->cs_gpio, dev_name(&spi->dev));
if (ret) {
dev_err(&spi->dev, "failed to request gpio\n");
return ret;
}
gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
}
ret = pm_runtime_get_sync(mcspi->dev);
if (ret < 0)
return ret;
@ -1050,9 +1070,13 @@ static void omap2_mcspi_cleanup(struct spi_device *spi)
mcspi_dma->dma_tx = NULL;
}
}
if (gpio_is_valid(spi->cs_gpio))
gpio_free(spi->cs_gpio);
}
static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m)
static int omap2_mcspi_work_one(struct omap2_mcspi *mcspi,
struct spi_device *spi, struct spi_transfer *t)
{
/* We only enable one channel at a time -- the one whose message is
@ -1062,18 +1086,14 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m)
* chipselect with the FORCE bit ... CS != channel enable.
*/
struct spi_device *spi;
struct spi_transfer *t = NULL;
struct spi_master *master;
struct omap2_mcspi_dma *mcspi_dma;
int cs_active = 0;
struct omap2_mcspi_cs *cs;
struct omap2_mcspi_device_config *cd;
int par_override = 0;
int status = 0;
u32 chconf;
spi = m->spi;
master = spi->master;
mcspi_dma = mcspi->dma_channels + spi->chip_select;
cs = spi->controller_state;
@ -1090,103 +1110,84 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m)
par_override = 1;
omap2_mcspi_set_enable(spi, 0);
list_for_each_entry(t, &m->transfers, transfer_list) {
if (t->tx_buf == NULL && t->rx_buf == NULL && t->len) {
status = -EINVAL;
break;
}
if (par_override ||
(t->speed_hz != spi->max_speed_hz) ||
(t->bits_per_word != spi->bits_per_word)) {
par_override = 1;
status = omap2_mcspi_setup_transfer(spi, t);
if (status < 0)
break;
if (t->speed_hz == spi->max_speed_hz &&
t->bits_per_word == spi->bits_per_word)
par_override = 0;
}
if (cd && cd->cs_per_word) {
chconf = mcspi->ctx.modulctrl;
chconf &= ~OMAP2_MCSPI_MODULCTRL_SINGLE;
mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, chconf);
mcspi->ctx.modulctrl =
mcspi_read_cs_reg(spi, OMAP2_MCSPI_MODULCTRL);
}
if (gpio_is_valid(spi->cs_gpio))
omap2_mcspi_set_cs(spi, spi->mode & SPI_CS_HIGH);
if (!cs_active) {
omap2_mcspi_force_cs(spi, 1);
cs_active = 1;
}
chconf = mcspi_cached_chconf0(spi);
chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
chconf &= ~OMAP2_MCSPI_CHCONF_TURBO;
if (t->tx_buf == NULL)
chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY;
else if (t->rx_buf == NULL)
chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY;
if (cd && cd->turbo_mode && t->tx_buf == NULL) {
/* Turbo mode is for more than one word */
if (t->len > ((cs->word_len + 7) >> 3))
chconf |= OMAP2_MCSPI_CHCONF_TURBO;
}
mcspi_write_chconf0(spi, chconf);
if (t->len) {
unsigned count;
if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) &&
(m->is_dma_mapped || t->len >= DMA_MIN_BYTES))
omap2_mcspi_set_fifo(spi, t, 1);
omap2_mcspi_set_enable(spi, 1);
/* RX_ONLY mode needs dummy data in TX reg */
if (t->tx_buf == NULL)
writel_relaxed(0, cs->base
+ OMAP2_MCSPI_TX0);
if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) &&
(m->is_dma_mapped || t->len >= DMA_MIN_BYTES))
count = omap2_mcspi_txrx_dma(spi, t);
else
count = omap2_mcspi_txrx_pio(spi, t);
m->actual_length += count;
if (count != t->len) {
status = -EIO;
break;
}
}
if (t->delay_usecs)
udelay(t->delay_usecs);
/* ignore the "leave it on after last xfer" hint */
if (t->cs_change) {
omap2_mcspi_force_cs(spi, 0);
cs_active = 0;
}
omap2_mcspi_set_enable(spi, 0);
if (mcspi->fifo_depth > 0)
omap2_mcspi_set_fifo(spi, t, 0);
if (par_override ||
(t->speed_hz != spi->max_speed_hz) ||
(t->bits_per_word != spi->bits_per_word)) {
par_override = 1;
status = omap2_mcspi_setup_transfer(spi, t);
if (status < 0)
goto out;
if (t->speed_hz == spi->max_speed_hz &&
t->bits_per_word == spi->bits_per_word)
par_override = 0;
}
if (cd && cd->cs_per_word) {
chconf = mcspi->ctx.modulctrl;
chconf &= ~OMAP2_MCSPI_MODULCTRL_SINGLE;
mcspi_write_reg(master, OMAP2_MCSPI_MODULCTRL, chconf);
mcspi->ctx.modulctrl =
mcspi_read_cs_reg(spi, OMAP2_MCSPI_MODULCTRL);
}
chconf = mcspi_cached_chconf0(spi);
chconf &= ~OMAP2_MCSPI_CHCONF_TRM_MASK;
chconf &= ~OMAP2_MCSPI_CHCONF_TURBO;
if (t->tx_buf == NULL)
chconf |= OMAP2_MCSPI_CHCONF_TRM_RX_ONLY;
else if (t->rx_buf == NULL)
chconf |= OMAP2_MCSPI_CHCONF_TRM_TX_ONLY;
if (cd && cd->turbo_mode && t->tx_buf == NULL) {
/* Turbo mode is for more than one word */
if (t->len > ((cs->word_len + 7) >> 3))
chconf |= OMAP2_MCSPI_CHCONF_TURBO;
}
mcspi_write_chconf0(spi, chconf);
if (t->len) {
unsigned count;
if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) &&
(t->len >= DMA_MIN_BYTES))
omap2_mcspi_set_fifo(spi, t, 1);
omap2_mcspi_set_enable(spi, 1);
/* RX_ONLY mode needs dummy data in TX reg */
if (t->tx_buf == NULL)
writel_relaxed(0, cs->base
+ OMAP2_MCSPI_TX0);
if ((mcspi_dma->dma_rx && mcspi_dma->dma_tx) &&
(t->len >= DMA_MIN_BYTES))
count = omap2_mcspi_txrx_dma(spi, t);
else
count = omap2_mcspi_txrx_pio(spi, t);
if (count != t->len) {
status = -EIO;
goto out;
}
}
omap2_mcspi_set_enable(spi, 0);
if (mcspi->fifo_depth > 0)
omap2_mcspi_set_fifo(spi, t, 0);
out:
/* Restore defaults if they were overriden */
if (par_override) {
par_override = 0;
status = omap2_mcspi_setup_transfer(spi, NULL);
}
if (cs_active)
omap2_mcspi_force_cs(spi, 0);
if (cd && cd->cs_per_word) {
chconf = mcspi->ctx.modulctrl;
chconf |= OMAP2_MCSPI_MODULCTRL_SINGLE;
@ -1197,78 +1198,64 @@ static void omap2_mcspi_work(struct omap2_mcspi *mcspi, struct spi_message *m)
omap2_mcspi_set_enable(spi, 0);
if (gpio_is_valid(spi->cs_gpio))
omap2_mcspi_set_cs(spi, !(spi->mode & SPI_CS_HIGH));
if (mcspi->fifo_depth > 0 && t)
omap2_mcspi_set_fifo(spi, t, 0);
m->status = status;
return status;
}
static int omap2_mcspi_transfer_one_message(struct spi_master *master,
struct spi_message *m)
static int omap2_mcspi_transfer_one(struct spi_master *master,
struct spi_device *spi, struct spi_transfer *t)
{
struct spi_device *spi;
struct omap2_mcspi *mcspi;
struct omap2_mcspi_dma *mcspi_dma;
struct spi_transfer *t;
int status;
const void *tx_buf = t->tx_buf;
void *rx_buf = t->rx_buf;
unsigned len = t->len;
spi = m->spi;
mcspi = spi_master_get_devdata(master);
mcspi_dma = mcspi->dma_channels + spi->chip_select;
m->actual_length = 0;
m->status = 0;
list_for_each_entry(t, &m->transfers, transfer_list) {
const void *tx_buf = t->tx_buf;
void *rx_buf = t->rx_buf;
unsigned len = t->len;
if ((len && !(rx_buf || tx_buf))) {
dev_dbg(mcspi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n",
t->speed_hz,
len,
tx_buf ? "tx" : "",
rx_buf ? "rx" : "",
t->bits_per_word);
return -EINVAL;
}
if ((len && !(rx_buf || tx_buf))) {
dev_dbg(mcspi->dev, "transfer: %d Hz, %d %s%s, %d bpw\n",
t->speed_hz,
len,
tx_buf ? "tx" : "",
rx_buf ? "rx" : "",
t->bits_per_word);
status = -EINVAL;
goto out;
if (len < DMA_MIN_BYTES)
goto skip_dma_map;
if (mcspi_dma->dma_tx && tx_buf != NULL) {
t->tx_dma = dma_map_single(mcspi->dev, (void *) tx_buf,
len, DMA_TO_DEVICE);
if (dma_mapping_error(mcspi->dev, t->tx_dma)) {
dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
'T', len);
return -EINVAL;
}
if (m->is_dma_mapped || len < DMA_MIN_BYTES)
continue;
if (mcspi_dma->dma_tx && tx_buf != NULL) {
t->tx_dma = dma_map_single(mcspi->dev, (void *) tx_buf,
len, DMA_TO_DEVICE);
if (dma_mapping_error(mcspi->dev, t->tx_dma)) {
dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
'T', len);
status = -EINVAL;
goto out;
}
}
if (mcspi_dma->dma_rx && rx_buf != NULL) {
t->rx_dma = dma_map_single(mcspi->dev, rx_buf, t->len,
DMA_FROM_DEVICE);
if (dma_mapping_error(mcspi->dev, t->rx_dma)) {
dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
'R', len);
if (tx_buf != NULL)
dma_unmap_single(mcspi->dev, t->tx_dma,
len, DMA_TO_DEVICE);
status = -EINVAL;
goto out;
}
}
if (mcspi_dma->dma_rx && rx_buf != NULL) {
t->rx_dma = dma_map_single(mcspi->dev, rx_buf, t->len,
DMA_FROM_DEVICE);
if (dma_mapping_error(mcspi->dev, t->rx_dma)) {
dev_dbg(mcspi->dev, "dma %cX %d bytes error\n",
'R', len);
if (tx_buf != NULL)
dma_unmap_single(mcspi->dev, t->tx_dma,
len, DMA_TO_DEVICE);
return -EINVAL;
}
}
omap2_mcspi_work(mcspi, m);
/* spi_finalize_current_message() changes the status inside the
* spi_message, save the status here. */
status = m->status;
out:
spi_finalize_current_message(master);
return status;
skip_dma_map:
return omap2_mcspi_work_one(mcspi, spi, t);
}
static int omap2_mcspi_master_setup(struct omap2_mcspi *mcspi)
@ -1347,7 +1334,8 @@ static int omap2_mcspi_probe(struct platform_device *pdev)
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
master->setup = omap2_mcspi_setup;
master->auto_runtime_pm = true;
master->transfer_one_message = omap2_mcspi_transfer_one_message;
master->transfer_one = omap2_mcspi_transfer_one;
master->set_cs = omap2_mcspi_set_cs;
master->cleanup = omap2_mcspi_cleanup;
master->dev.of_node = node;
master->max_speed_hz = OMAP2_MCSPI_MAX_FREQ;

70
drivers/spi/spi-orion.c
View File

@ -61,6 +61,12 @@ enum orion_spi_type {
struct orion_spi_dev {
enum orion_spi_type typ;
/*
* min_divisor and max_hz should be exclusive, the only we can
* have both is for managing the armada-370-spi case with old
* device tree
*/
unsigned long max_hz;
unsigned int min_divisor;
unsigned int max_divisor;
u32 prescale_mask;
@ -385,16 +391,54 @@ static const struct orion_spi_dev orion_spi_dev_data = {
.prescale_mask = ORION_SPI_CLK_PRESCALE_MASK,
};
static const struct orion_spi_dev armada_spi_dev_data = {
static const struct orion_spi_dev armada_370_spi_dev_data = {
.typ = ARMADA_SPI,
.min_divisor = 1,
.min_divisor = 4,
.max_divisor = 1920,
.max_hz = 50000000,
.prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK,
};
static const struct orion_spi_dev armada_xp_spi_dev_data = {
.typ = ARMADA_SPI,
.max_hz = 50000000,
.max_divisor = 1920,
.prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK,
};
static const struct orion_spi_dev armada_375_spi_dev_data = {
.typ = ARMADA_SPI,
.min_divisor = 15,
.max_divisor = 1920,
.prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK,
};
static const struct of_device_id orion_spi_of_match_table[] = {
{ .compatible = "marvell,orion-spi", .data = &orion_spi_dev_data, },
{ .compatible = "marvell,armada-370-spi", .data = &armada_spi_dev_data, },
{
.compatible = "marvell,orion-spi",
.data = &orion_spi_dev_data,
},
{
.compatible = "marvell,armada-370-spi",
.data = &armada_370_spi_dev_data,
},
{
.compatible = "marvell,armada-375-spi",
.data = &armada_375_spi_dev_data,
},
{
.compatible = "marvell,armada-380-spi",
.data = &armada_xp_spi_dev_data,
},
{
.compatible = "marvell,armada-390-spi",
.data = &armada_xp_spi_dev_data,
},
{
.compatible = "marvell,armada-xp-spi",
.data = &armada_xp_spi_dev_data,
},
{}
};
MODULE_DEVICE_TABLE(of, orion_spi_of_match_table);
@ -454,7 +498,23 @@ static int orion_spi_probe(struct platform_device *pdev)
goto out;
tclk_hz = clk_get_rate(spi->clk);
master->max_speed_hz = DIV_ROUND_UP(tclk_hz, devdata->min_divisor);
/*
* With old device tree, armada-370-spi could be used with
* Armada XP, however for this SoC the maximum frequency is
* 50MHz instead of tclk/4. On Armada 370, tclk cannot be
* higher than 200MHz. So, in order to be able to handle both
* SoCs, we can take the minimum of 50MHz and tclk/4.
*/
if (of_device_is_compatible(pdev->dev.of_node,
"marvell,armada-370-spi"))
master->max_speed_hz = min(devdata->max_hz,
DIV_ROUND_UP(tclk_hz, devdata->min_divisor));
else if (devdata->min_divisor)
master->max_speed_hz =
DIV_ROUND_UP(tclk_hz, devdata->min_divisor);
else
master->max_speed_hz = devdata->max_hz;
master->min_speed_hz = DIV_ROUND_UP(tclk_hz, devdata->max_divisor);
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);

8
drivers/spi/spi-pxa2xx-pci.c
View File

@ -62,7 +62,7 @@ static struct pxa_spi_info spi_info_configs[] = {
.max_clk_rate = 3686400,
},
[PORT_BYT] = {
.type = LPSS_SSP,
.type = LPSS_BYT_SSP,
.port_id = 0,
.num_chipselect = 1,
.max_clk_rate = 50000000,
@ -70,7 +70,7 @@ static struct pxa_spi_info spi_info_configs[] = {
.rx_param = &byt_rx_param,
},
[PORT_BSW0] = {
.type = LPSS_SSP,
.type = LPSS_BYT_SSP,
.port_id = 0,
.num_chipselect = 1,
.max_clk_rate = 50000000,
@ -78,7 +78,7 @@ static struct pxa_spi_info spi_info_configs[] = {
.rx_param = &bsw0_rx_param,
},
[PORT_BSW1] = {
.type = LPSS_SSP,
.type = LPSS_BYT_SSP,
.port_id = 1,
.num_chipselect = 1,
.max_clk_rate = 50000000,
@ -86,7 +86,7 @@ static struct pxa_spi_info spi_info_configs[] = {
.rx_param = &bsw1_rx_param,
},
[PORT_BSW2] = {
.type = LPSS_SSP,
.type = LPSS_BYT_SSP,
.port_id = 2,
.num_chipselect = 1,
.max_clk_rate = 50000000,

487
drivers/spi/spi-pxa2xx-pxadma.c
View File

@ -1,487 +0,0 @@
/*
* 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.
*/
#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 <mach/dma.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(struct driver_data *drv_data)
{
unsigned long limit = loops_per_jiffy << 1;
while ((pxa2xx_spi_read(drv_data, SSSR) & 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)
{
/* 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);
pxa2xx_spi_write(drv_data, SSCR1,
pxa2xx_spi_read(drv_data, SSCR1)
& ~drv_data->dma_cr1);
if (!pxa25x_ssp_comp(drv_data))
pxa2xx_spi_write(drv_data, SSTO, 0);
pxa2xx_spi_flush(drv_data);
pxa2xx_spi_write(drv_data, SSCR0,
pxa2xx_spi_read(drv_data, SSCR0) & ~SSCR0_SSE);
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)
{
struct spi_message *msg = drv_data->cur_msg;
/* Clear and disable interrupts on SSP and DMA channels*/
pxa2xx_spi_write(drv_data, SSCR1,
pxa2xx_spi_read(drv_data, SSCR1)
& ~drv_data->dma_cr1);
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) == 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;
irq_status = pxa2xx_spi_read(drv_data, SSSR) & 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)) {
pxa2xx_spi_write(drv_data, SSSR, SSSR_TINT);
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))
pxa2xx_spi_write(drv_data, SSTO, 0);
/* 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;
}

157
drivers/spi/spi-pxa2xx.c
View File

@ -60,21 +60,60 @@ MODULE_ALIAS("platform:pxa2xx-spi");
| QUARK_X1000_SSCR1_TFT \
| SSCR1_SPH | SSCR1_SPO | SSCR1_LBM)
#define LPSS_RX_THRESH_DFLT 64
#define LPSS_TX_LOTHRESH_DFLT 160
#define LPSS_TX_HITHRESH_DFLT 224
/* Offset from drv_data->lpss_base */
#define GENERAL_REG 0x08
#define GENERAL_REG_RXTO_HOLDOFF_DISABLE BIT(24)
#define SSP_REG 0x0c
#define SPI_CS_CONTROL 0x18
#define SPI_CS_CONTROL_SW_MODE BIT(0)
#define SPI_CS_CONTROL_CS_HIGH BIT(1)
struct lpss_config {
/* LPSS offset from drv_data->ioaddr */
unsigned offset;
/* Register offsets from drv_data->lpss_base or -1 */
int reg_general;
int reg_ssp;
int reg_cs_ctrl;
/* FIFO thresholds */
u32 rx_threshold;
u32 tx_threshold_lo;
u32 tx_threshold_hi;
};
/* Keep these sorted with enum pxa_ssp_type */
static const struct lpss_config lpss_platforms[] = {
{ /* LPSS_LPT_SSP */
.offset = 0x800,
.reg_general = 0x08,
.reg_ssp = 0x0c,
.reg_cs_ctrl = 0x18,
.rx_threshold = 64,
.tx_threshold_lo = 160,
.tx_threshold_hi = 224,
},
{ /* LPSS_BYT_SSP */
.offset = 0x400,
.reg_general = 0x08,
.reg_ssp = 0x0c,
.reg_cs_ctrl = 0x18,
.rx_threshold = 64,
.tx_threshold_lo = 160,
.tx_threshold_hi = 224,
},
};
static inline const struct lpss_config
*lpss_get_config(const struct driver_data *drv_data)
{
return &lpss_platforms[drv_data->ssp_type - LPSS_LPT_SSP];
}
static bool is_lpss_ssp(const struct driver_data *drv_data)
{
return drv_data->ssp_type == LPSS_SSP;
switch (drv_data->ssp_type) {
case LPSS_LPT_SSP:
case LPSS_BYT_SSP:
return true;
default:
return false;
}
}
static bool is_quark_x1000_ssp(const struct driver_data *drv_data)
@ -192,63 +231,43 @@ static void __lpss_ssp_write_priv(struct driver_data *drv_data,
*/
static void lpss_ssp_setup(struct driver_data *drv_data)
{
unsigned offset = 0x400;
u32 value, orig;
const struct lpss_config *config;
u32 value;
/*
* 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);
/* Test SPI_CS_CONTROL_SW_MODE bit enabling */
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;
}
orig = readl(drv_data->ioaddr + offset + SPI_CS_CONTROL);
/* Test SPI_CS_CONTROL_SW_MODE bit disabling */
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;
}
detection_done:
/* Now set the LPSS base */
drv_data->lpss_base = drv_data->ioaddr + offset;
config = lpss_get_config(drv_data);
drv_data->lpss_base = drv_data->ioaddr + config->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);
__lpss_ssp_write_priv(drv_data, config->reg_cs_ctrl, value);
/* Enable multiblock DMA transfers */
if (drv_data->master_info->enable_dma) {
__lpss_ssp_write_priv(drv_data, SSP_REG, 1);
__lpss_ssp_write_priv(drv_data, config->reg_ssp, 1);
value = __lpss_ssp_read_priv(drv_data, GENERAL_REG);
value |= GENERAL_REG_RXTO_HOLDOFF_DISABLE;
__lpss_ssp_write_priv(drv_data, GENERAL_REG, value);
if (config->reg_general >= 0) {
value = __lpss_ssp_read_priv(drv_data,
config->reg_general);
value |= GENERAL_REG_RXTO_HOLDOFF_DISABLE;
__lpss_ssp_write_priv(drv_data,
config->reg_general, value);
}
}
}
static void lpss_ssp_cs_control(struct driver_data *drv_data, bool enable)
{
const struct lpss_config *config;
u32 value;
value = __lpss_ssp_read_priv(drv_data, SPI_CS_CONTROL);
config = lpss_get_config(drv_data);
value = __lpss_ssp_read_priv(drv_data, config->reg_cs_ctrl);
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);
__lpss_ssp_write_priv(drv_data, config->reg_cs_ctrl, value);
}
static void cs_assert(struct driver_data *drv_data)
@ -1075,6 +1094,7 @@ static int setup(struct spi_device *spi)
{
struct pxa2xx_spi_chip *chip_info = NULL;
struct chip_data *chip;
const struct lpss_config *config;
struct driver_data *drv_data = spi_master_get_devdata(spi->master);
unsigned int clk_div;
uint tx_thres, tx_hi_thres, rx_thres;
@ -1085,10 +1105,12 @@ static int setup(struct spi_device *spi)
tx_hi_thres = 0;
rx_thres = RX_THRESH_QUARK_X1000_DFLT;
break;
case LPSS_SSP:
tx_thres = LPSS_TX_LOTHRESH_DFLT;
tx_hi_thres = LPSS_TX_HITHRESH_DFLT;
rx_thres = LPSS_RX_THRESH_DFLT;
case LPSS_LPT_SSP:
case LPSS_BYT_SSP:
config = lpss_get_config(drv_data);
tx_thres = config->tx_threshold_lo;
tx_hi_thres = config->tx_threshold_hi;
rx_thres = config->rx_threshold;
break;
default:
tx_thres = TX_THRESH_DFLT;
@ -1242,6 +1264,18 @@ static void cleanup(struct spi_device *spi)
}
#ifdef CONFIG_ACPI
static const struct acpi_device_id pxa2xx_spi_acpi_match[] = {
{ "INT33C0", LPSS_LPT_SSP },
{ "INT33C1", LPSS_LPT_SSP },
{ "INT3430", LPSS_LPT_SSP },
{ "INT3431", LPSS_LPT_SSP },
{ "80860F0E", LPSS_BYT_SSP },
{ "8086228E", LPSS_BYT_SSP },
{ },
};
MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match);
static struct pxa2xx_spi_master *
pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
{
@ -1249,12 +1283,19 @@ pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
struct acpi_device *adev;
struct ssp_device *ssp;
struct resource *res;
int devid;
const struct acpi_device_id *id;
int devid, type;
if (!ACPI_HANDLE(&pdev->dev) ||
acpi_bus_get_device(ACPI_HANDLE(&pdev->dev), &adev))
return NULL;
id = acpi_match_device(pdev->dev.driver->acpi_match_table, &pdev->dev);
if (id)
type = (int)id->driver_data;
else
return NULL;
pdata = devm_kzalloc(&pdev->dev, sizeof(*pdata), GFP_KERNEL);
if (!pdata)
return NULL;
@ -1272,7 +1313,7 @@ pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
ssp->clk = devm_clk_get(&pdev->dev, NULL);
ssp->irq = platform_get_irq(pdev, 0);
ssp->type = LPSS_SSP;
ssp->type = type;
ssp->pdev = pdev;
ssp->port_id = -1;
@ -1285,16 +1326,6 @@ pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
return pdata;
}
static struct acpi_device_id pxa2xx_spi_acpi_match[] = {
{ "INT33C0", 0 },
{ "INT33C1", 0 },
{ "INT3430", 0 },
{ "INT3431", 0 },
{ "80860F0E", 0 },
{ "8086228E", 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)

6
drivers/spi/spi-pxa2xx.h
View File

@ -162,11 +162,7 @@ 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)
#if 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)

210
drivers/spi/spi-rb4xx.c Normal file
View File

@ -0,0 +1,210 @@
/*
* SPI controller driver for the Mikrotik RB4xx boards
*
* Copyright (C) 2010 Gabor Juhos <juhosg@openwrt.org>
* Copyright (C) 2015 Bert Vermeulen <bert@biot.com>
*
* This file was based on the patches for Linux 2.6.27.39 published by
* MikroTik for their RouterBoard 4xx series devices.
*
* 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/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/spi/spi.h>
#include <asm/mach-ath79/ar71xx_regs.h>
struct rb4xx_spi {
void __iomem *base;
struct clk *clk;
};
static inline u32 rb4xx_read(struct rb4xx_spi *rbspi, u32 reg)
{
return __raw_readl(rbspi->base + reg);
}
static inline void rb4xx_write(struct rb4xx_spi *rbspi, u32 reg, u32 value)
{
__raw_writel(value, rbspi->base + reg);
}
static inline void do_spi_clk(struct rb4xx_spi *rbspi, u32 spi_ioc, int value)
{
u32 regval;
regval = spi_ioc;
if (value & BIT(0))
regval |= AR71XX_SPI_IOC_DO;
rb4xx_write(rbspi, AR71XX_SPI_REG_IOC, regval);
rb4xx_write(rbspi, AR71XX_SPI_REG_IOC, regval | AR71XX_SPI_IOC_CLK);
}
static void do_spi_byte(struct rb4xx_spi *rbspi, u32 spi_ioc, u8 byte)
{
int i;
for (i = 7; i >= 0; i--)
do_spi_clk(rbspi, spi_ioc, byte >> i);
}
/* The CS2 pin is used to clock in a second bit per clock cycle. */
static inline void do_spi_clk_two(struct rb4xx_spi *rbspi, u32 spi_ioc,
u8 value)
{
u32 regval;
regval = spi_ioc;
if (value & BIT(1))
regval |= AR71XX_SPI_IOC_DO;
if (value & BIT(0))
regval |= AR71XX_SPI_IOC_CS2;
rb4xx_write(rbspi, AR71XX_SPI_REG_IOC, regval);
rb4xx_write(rbspi, AR71XX_SPI_REG_IOC, regval | AR71XX_SPI_IOC_CLK);
}
/* Two bits at a time, msb first */
static void do_spi_byte_two(struct rb4xx_spi *rbspi, u32 spi_ioc, u8 byte)
{
do_spi_clk_two(rbspi, spi_ioc, byte >> 6);
do_spi_clk_two(rbspi, spi_ioc, byte >> 4);
do_spi_clk_two(rbspi, spi_ioc, byte >> 2);
do_spi_clk_two(rbspi, spi_ioc, byte >> 0);
}
static void rb4xx_set_cs(struct spi_device *spi, bool enable)
{
struct rb4xx_spi *rbspi = spi_master_get_devdata(spi->master);
/*
* Setting CS is done along with bitbanging the actual values,
* since it's all on the same hardware register. However the
* CPLD needs CS deselected after every command.
*/
if (enable)
rb4xx_write(rbspi, AR71XX_SPI_REG_IOC,
AR71XX_SPI_IOC_CS0 | AR71XX_SPI_IOC_CS1);
}
static int rb4xx_transfer_one(struct spi_master *master,
struct spi_device *spi, struct spi_transfer *t)
{
struct rb4xx_spi *rbspi = spi_master_get_devdata(master);
int i;
u32 spi_ioc;
u8 *rx_buf;
const u8 *tx_buf;
/*
* Prime the SPI register with the SPI device selected. The m25p80 boot
* flash and CPLD share the CS0 pin. This works because the CPLD's
* command set was designed to almost not clash with that of the
* boot flash.
*/
if (spi->chip_select == 2)
/* MMC */
spi_ioc = AR71XX_SPI_IOC_CS0;
else
/* Boot flash and CPLD */
spi_ioc = AR71XX_SPI_IOC_CS1;
tx_buf = t->tx_buf;
rx_buf = t->rx_buf;
for (i = 0; i < t->len; ++i) {
if (t->tx_nbits == SPI_NBITS_DUAL)
/* CPLD can use two-wire transfers */
do_spi_byte_two(rbspi, spi_ioc, tx_buf[i]);
else
do_spi_byte(rbspi, spi_ioc, tx_buf[i]);
if (!rx_buf)
continue;
rx_buf[i] = rb4xx_read(rbspi, AR71XX_SPI_REG_RDS);
}
spi_finalize_current_transfer(master);
return 0;
}
static int rb4xx_spi_probe(struct platform_device *pdev)
{
struct spi_master *master;
struct clk *ahb_clk;
struct rb4xx_spi *rbspi;
struct resource *r;
int err;
void __iomem *spi_base;
r = platform_get_resource(pdev, IORESOURCE_MEM, 0);
spi_base = devm_ioremap_resource(&pdev->dev, r);
if (IS_ERR(spi_base))
return PTR_ERR(spi_base);
master = spi_alloc_master(&pdev->dev, sizeof(*rbspi));
if (!master)
return -ENOMEM;
ahb_clk = devm_clk_get(&pdev->dev, "ahb");
if (IS_ERR(ahb_clk))
return PTR_ERR(ahb_clk);
master->bus_num = 0;
master->num_chipselect = 3;
master->mode_bits = SPI_TX_DUAL;
master->bits_per_word_mask = BIT(7);
master->flags = SPI_MASTER_MUST_TX;
master->transfer_one = rb4xx_transfer_one;
master->set_cs = rb4xx_set_cs;
err = devm_spi_register_master(&pdev->dev, master);
if (err) {
dev_err(&pdev->dev, "failed to register SPI master\n");
return err;
}
err = clk_prepare_enable(ahb_clk);
if (err)
return err;
rbspi = spi_master_get_devdata(master);
rbspi->base = spi_base;
rbspi->clk = ahb_clk;
platform_set_drvdata(pdev, rbspi);
/* Enable SPI */
rb4xx_write(rbspi, AR71XX_SPI_REG_FS, AR71XX_SPI_FS_GPIO);
return 0;
}
static int rb4xx_spi_remove(struct platform_device *pdev)
{
struct rb4xx_spi *rbspi = platform_get_drvdata(pdev);
clk_disable_unprepare(rbspi->clk);
return 0;
}
static struct platform_driver rb4xx_spi_drv = {
.probe = rb4xx_spi_probe,
.remove = rb4xx_spi_remove,
.driver = {
.name = "rb4xx-spi",
},
};
module_platform_driver(rb4xx_spi_drv);
MODULE_DESCRIPTION("Mikrotik RB4xx SPI controller driver");
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
MODULE_AUTHOR("Bert Vermeulen <bert@biot.com>");
MODULE_LICENSE("GPL v2");

23
drivers/spi/spi-rspi.c
View File

@ -665,15 +665,12 @@ static bool rspi_can_dma(struct spi_master *master, struct spi_device *spi,
static int rspi_dma_check_then_transfer(struct rspi_data *rspi,
struct spi_transfer *xfer)
{
if (rspi->master->can_dma && __rspi_can_dma(rspi, xfer)) {
/* rx_buf can be NULL on RSPI on SH in TX-only Mode */
int ret = rspi_dma_transfer(rspi, &xfer->tx_sg,
xfer->rx_buf ? &xfer->rx_sg : NULL);
if (ret != -EAGAIN)
return 0;
}
if (!rspi->master->can_dma || !__rspi_can_dma(rspi, xfer))
return -EAGAIN;
return -EAGAIN;
/* rx_buf can be NULL on RSPI on SH in TX-only Mode */
return rspi_dma_transfer(rspi, &xfer->tx_sg,
xfer->rx_buf ? &xfer->rx_sg : NULL);
}
static int rspi_common_transfer(struct rspi_data *rspi,
@ -724,7 +721,7 @@ static int rspi_rz_transfer_one(struct spi_master *master,
return rspi_common_transfer(rspi, xfer);
}
static int qspi_trigger_transfer_out_int(struct rspi_data *rspi, const u8 *tx,
static int qspi_trigger_transfer_out_in(struct rspi_data *rspi, const u8 *tx,
u8 *rx, unsigned int len)
{
int i, n, ret;
@ -771,12 +768,8 @@ static int qspi_transfer_out_in(struct rspi_data *rspi,
if (ret != -EAGAIN)
return ret;
ret = qspi_trigger_transfer_out_int(rspi, xfer->tx_buf,
return qspi_trigger_transfer_out_in(rspi, xfer->tx_buf,
xfer->rx_buf, xfer->len);
if (ret < 0)
return ret;
return 0;
}
static int qspi_transfer_out(struct rspi_data *rspi, struct spi_transfer *xfer)
@ -1300,7 +1293,7 @@ error1:
return ret;
}
static struct platform_device_id spi_driver_ids[] = {
static const struct platform_device_id spi_driver_ids[] = {
{ "rspi", (kernel_ulong_t)&rspi_ops },
{ "rspi-rz", (kernel_ulong_t)&rspi_rz_ops },
{ "qspi", (kernel_ulong_t)&qspi_ops },

2
drivers/spi/spi-s3c64xx.c
View File

@ -1347,7 +1347,7 @@ static struct s3c64xx_spi_port_config exynos7_spi_port_config = {
.quirks = S3C64XX_SPI_QUIRK_CS_AUTO,
};
static struct platform_device_id s3c64xx_spi_driver_ids[] = {
static const struct platform_device_id s3c64xx_spi_driver_ids[] = {
{
.name = "s3c2443-spi",
.driver_data = (kernel_ulong_t)&s3c2443_spi_port_config,

2
drivers/spi/spi-sh-msiof.c
View File

@ -1263,7 +1263,7 @@ static int sh_msiof_spi_remove(struct platform_device *pdev)
return 0;
}
static struct platform_device_id spi_driver_ids[] = {
static const struct platform_device_id spi_driver_ids[] = {
{ "spi_sh_msiof", (kernel_ulong_t)&sh_data },
{ "spi_r8a7790_msiof", (kernel_ulong_t)&r8a779x_data },
{ "spi_r8a7791_msiof", (kernel_ulong_t)&r8a779x_data },

871
drivers/spi/spi-sirf.c
View File

File diff suppressed because it is too large Load Diff

1122
drivers/spi/spi-zynqmp-gqspi.c Normal file
View File

File diff suppressed because it is too large Load Diff

45
drivers/spi/spi.c
View File

@ -571,7 +571,7 @@ static int __spi_map_msg(struct spi_master *master, struct spi_message *msg)
return 0;
}
static int spi_unmap_msg(struct spi_master *master, struct spi_message *msg)
static int __spi_unmap_msg(struct spi_master *master, struct spi_message *msg)
{
struct spi_transfer *xfer;
struct device *tx_dev, *rx_dev;
@ -583,15 +583,6 @@ static int spi_unmap_msg(struct spi_master *master, struct spi_message *msg)
rx_dev = master->dma_rx->device->dev;
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
/*
* Restore the original value of tx_buf or rx_buf if they are
* NULL.
*/
if (xfer->tx_buf == master->dummy_tx)
xfer->tx_buf = NULL;
if (xfer->rx_buf == master->dummy_rx)
xfer->rx_buf = NULL;
if (!master->can_dma(master, msg->spi, xfer))
continue;
@ -608,13 +599,32 @@ static inline int __spi_map_msg(struct spi_master *master,
return 0;
}
static inline int spi_unmap_msg(struct spi_master *master,
struct spi_message *msg)
static inline int __spi_unmap_msg(struct spi_master *master,
struct spi_message *msg)
{
return 0;
}
#endif /* !CONFIG_HAS_DMA */
static inline int spi_unmap_msg(struct spi_master *master,
struct spi_message *msg)
{
struct spi_transfer *xfer;
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
/*
* Restore the original value of tx_buf or rx_buf if they are
* NULL.
*/
if (xfer->tx_buf == master->dummy_tx)
xfer->tx_buf = NULL;
if (xfer->rx_buf == master->dummy_rx)
xfer->rx_buf = NULL;
}
return __spi_unmap_msg(master, msg);
}
static int spi_map_msg(struct spi_master *master, struct spi_message *msg)
{
struct spi_transfer *xfer;
@ -988,9 +998,6 @@ void spi_finalize_current_message(struct spi_master *master)
spin_lock_irqsave(&master->queue_lock, flags);
mesg = master->cur_msg;
master->cur_msg = NULL;
queue_kthread_work(&master->kworker, &master->pump_messages);
spin_unlock_irqrestore(&master->queue_lock, flags);
spi_unmap_msg(master, mesg);
@ -1003,9 +1010,13 @@ void spi_finalize_current_message(struct spi_master *master)
}
}
trace_spi_message_done(mesg);
spin_lock_irqsave(&master->queue_lock, flags);
master->cur_msg = NULL;
master->cur_msg_prepared = false;
queue_kthread_work(&master->kworker, &master->pump_messages);
spin_unlock_irqrestore(&master->queue_lock, flags);
trace_spi_message_done(mesg);
mesg->state = NULL;
if (mesg->complete)

35
drivers/spi/spidev.c
View File

@ -95,37 +95,25 @@ MODULE_PARM_DESC(bufsiz, "data bytes in biggest supported SPI message");
/*-------------------------------------------------------------------------*/
/*
* We can't use the standard synchronous wrappers for file I/O; we
* need to protect against async removal of the underlying spi_device.
*/
static void spidev_complete(void *arg)
{
complete(arg);
}
static ssize_t
spidev_sync(struct spidev_data *spidev, struct spi_message *message)
{
DECLARE_COMPLETION_ONSTACK(done);
int status;
message->complete = spidev_complete;
message->context = &done;
struct spi_device *spi;
spin_lock_irq(&spidev->spi_lock);
if (spidev->spi == NULL)
status = -ESHUTDOWN;
else
status = spi_async(spidev->spi, message);
spi = spidev->spi;
spin_unlock_irq(&spidev->spi_lock);
if (status == 0) {
wait_for_completion(&done);
status = message->status;
if (status == 0)
status = message->actual_length;
}
if (spi == NULL)
status = -ESHUTDOWN;
else
status = spi_sync(spi, message);
if (status == 0)
status = message->actual_length;
return status;
}
@ -647,7 +635,6 @@ err_find_dev:
static int spidev_release(struct inode *inode, struct file *filp)
{
struct spidev_data *spidev;
int status = 0;
mutex_lock(&device_list_lock);
spidev = filp->private_data;
@ -676,7 +663,7 @@ static int spidev_release(struct inode *inode, struct file *filp)
}
mutex_unlock(&device_list_lock);
return status;
return 0;
}
static const struct file_operations spidev_fops = {

3
include/linux/pxa2xx_ssp.h
View File

@ -194,8 +194,9 @@ enum pxa_ssp_type {
PXA168_SSP,
PXA910_SSP,
CE4100_SSP,
LPSS_SSP,
QUARK_X1000_SSP,
LPSS_LPT_SSP, /* Keep LPSS types sorted with lpss_platforms[] */
LPSS_BYT_SSP,
};
struct ssp_device {