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spi: Updates for v4.3 

A few core tweaks this time together with the usual collection of driver
 specific updates and fixes plus a larger than average selection of new
 device support:
 
  - Fix DMA mapping of unaligned vmalloc() buffers.
  - Statistics tracking transfer volumes exposed via sysfs.
  - New drivers for Freescale MPC5125, Intel Sunrise Point, Mediatek SoCs,
    and Netlogic XLP SoCs.
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Merge tag 'spi-v4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi

Pull spi updates from Mark Brown:
 "A few core tweaks this time together with the usual collection of
  driver specific updates and fixes plus a larger than average selection
  of new device support:

   - fix DMA mapping of unaligned vmalloc() buffers

   - statistics tracking transfer volumes exposed via sysfs

   - new drivers for Freescale MPC5125, Intel Sunrise Point, Mediatek
     SoCs, and Netlogic XLP SoCs"

* tag 'spi-v4.3' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi: (66 commits)
  spi: sh-msiof: Fix FIFO size to 64 word from 256 word
  spi: fsl-(e)spi: Fix checking return value of devm_ioremap_resource
  spi: Add DT bindings documentation for Netlogic XLP SPI controller
  spi/xlp: SPI controller driver for Netlogic XLP SoCs
  spi: fsl-espi: add runtime PM
  spi: fsl-(e)spi: simplify cleanup code
  spi: fsl-(e)spi: migrate to using devm_ functions to simplify cleanup
  spi: mediatek: fix SPI_CMD_PAUSE_IE macro error
  spi: check bits_per_word in spi_setup
  spi: mediatek: replace *_time name
  spi: mediatek: add PM clk_prepare_enable fail flow
  spi: mediatek: replace int with u32, delete TAB and define MTK_SPI_PAUSE_INT_STATUS marco
  spi: mediatek: add linux/io.h include file
  spi/bcm63xx-hsspi: add support for dual spi read/write
  spi: dw: Allow interface drivers to limit data I/O to word sizes
  dt: snps,dw-apb-ssi: Document new I/O data register width property
  spi: Fall back to master maximum speed if no slave speed specified
  spi: mediatek: use BIT() to instead of SPI_CMD_*_OFFSET
  spi: medaitek: revise quirks compatibility style
  spi: mediatek: fix spi incorrect endian usage
  ...
This commit is contained in:
Linus Torvalds 2015-08-31 15:55:49 -07:00
parent cf9d615f7f c5992f610f
commit e5aeced6bc
47 changed files with 2114 additions and 225 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
Documentation/devicetree/bindings/powerpc/fsl/mpc5121-psc.txt
View File

@ -6,14 +6,14 @@ PSC in UART mode
For PSC in UART mode the needed PSC serial devices
are specified by fsl,mpc5121-psc-uart nodes in the
fsl,mpc5121-immr SoC node. Additionally the PSC FIFO
Controller node fsl,mpc5121-psc-fifo is requered there:
Controller node fsl,mpc5121-psc-fifo is required there:
fsl,mpc5121-psc-uart nodes
fsl,mpc512x-psc-uart nodes
--------------------------
Required properties :
- compatible : Should contain "fsl,mpc5121-psc-uart" and "fsl,mpc5121-psc"
- cell-index : Index of the PSC in hardware
- compatible : Should contain "fsl,<soc>-psc-uart" and "fsl,<soc>-psc"
Supported <soc>s: mpc5121, mpc5125
- reg : Offset and length of the register set for the PSC device
- interrupts : <a b> where a is the interrupt number of the
PSC FIFO Controller and b is a field that represents an
@ -25,12 +25,21 @@ Recommended properties :
- fsl,rx-fifo-size : the size of the RX fifo slice (a multiple of 4)
- fsl,tx-fifo-size : the size of the TX fifo slice (a multiple of 4)
PSC in SPI mode
---------------
fsl,mpc5121-psc-fifo node
Similar to the UART mode a PSC can be operated in SPI mode. The compatible used
for that is fsl,mpc5121-psc-spi. It requires a fsl,mpc5121-psc-fifo as well.
The required and recommended properties are identical to the
fsl,mpc5121-psc-uart nodes, just use spi instead of uart in the compatible
string.
fsl,mpc512x-psc-fifo node
-------------------------
Required properties :
- compatible : Should be "fsl,mpc5121-psc-fifo"
- compatible : Should be "fsl,<soc>-psc-fifo"
Supported <soc>s: mpc5121, mpc5125
- reg : Offset and length of the register set for the PSC
FIFO Controller
- interrupts : <a b> where a is the interrupt number of the
@ -39,6 +48,9 @@ Required properties :
- interrupt-parent : the phandle for the interrupt controller that
services interrupts for this device.
Recommended properties :
- clocks : specifies the clock needed to operate the fifo controller
- clock-names : name(s) for the clock(s) listed in clocks
Example for a board using PSC0 and PSC1 devices in serial mode:

2
Documentation/devicetree/bindings/spi/snps,dw-apb-ssi.txt
View File

@ -10,6 +10,8 @@ Required properties:
Optional properties:
- cs-gpios : Specifies the gpio pis to be used for chipselects.
- num-cs : The number of chipselects. If omitted, this will default to 4.
- reg-io-width : The I/O register width (in bytes) implemented by this
device. Supported values are 2 or 4 (the default).
Child nodes as per the generic SPI binding.

2
Documentation/devicetree/bindings/spi/spi-davinci.txt
View File

@ -12,6 +12,8 @@ Required properties:
- compatible:
- "ti,dm6441-spi" for SPI used similar to that on DM644x SoC family
- "ti,da830-spi" for SPI used similar to that on DA8xx SoC family
- "ti,keystone-spi" for SPI used similar to that on Keystone2 SoC
family
- reg: Offset and length of SPI controller register space
- num-cs: Number of chip selects. This includes internal as well as
GPIO chip selects.

1
Documentation/devicetree/bindings/spi/spi-img-spfi.txt
View File

@ -21,6 +21,7 @@ Required properties:
Optional properties:
- img,supports-quad-mode: Should be set if the interface supports quad mode
SPI transfers.
- spfi-max-frequency: Maximum speed supported by the spfi block.
Example:

51
Documentation/devicetree/bindings/spi/spi-mt65xx.txt Normal file
View File

@ -0,0 +1,51 @@
Binding for MTK SPI controller
Required properties:
- compatible: should be one of the following.
- mediatek,mt8173-spi: for mt8173 platforms
- mediatek,mt8135-spi: for mt8135 platforms
- mediatek,mt6589-spi: for mt6589 platforms
- #address-cells: should be 1.
- #size-cells: should be 0.
- reg: Address and length of the register set for the device
- interrupts: Should contain spi interrupt
- clocks: phandles to input clocks.
The first should be <&topckgen CLK_TOP_SPI_SEL>.
The second should be one of the following.
- <&clk26m>: specify parent clock 26MHZ.
- <&topckgen CLK_TOP_SYSPLL3_D2>: specify parent clock 109MHZ.
It's the default one.
- <&topckgen CLK_TOP_SYSPLL4_D2>: specify parent clock 78MHZ.
- <&topckgen CLK_TOP_UNIVPLL2_D4>: specify parent clock 104MHZ.
- <&topckgen CLK_TOP_UNIVPLL1_D8>: specify parent clock 78MHZ.
- clock-names: shall be "spi-clk" for the controller clock, and
"parent-clk" for the parent clock.
Optional properties:
- mediatek,pad-select: specify which pins group(ck/mi/mo/cs) spi
controller used, this value should be 0~3, only required for MT8173.
0: specify GPIO69,70,71,72 for spi pins.
1: specify GPIO102,103,104,105 for spi pins.
2: specify GPIO128,129,130,131 for spi pins.
3: specify GPIO5,6,7,8 for spi pins.
Example:
- SoC Specific Portion:
spi: spi@1100a000 {
compatible = "mediatek,mt8173-spi";
#address-cells = <1>;
#size-cells = <0>;
reg = <0 0x1100a000 0 0x1000>;
interrupts = <GIC_SPI 110 IRQ_TYPE_LEVEL_LOW>;
clocks = <&topckgen CLK_TOP_SPI_SEL>, <&topckgen CLK_TOP_SYSPLL3_D2>;
clock-names = "spi-clk", "parent-clk";
mediatek,pad-select = <0>;
status = "disabled";
};

39
Documentation/devicetree/bindings/spi/spi-xlp.txt Normal file
View File

@ -0,0 +1,39 @@
SPI Master controller for Netlogic XLP MIPS64 SOCs
==================================================
Currently this SPI controller driver is supported for the following
Netlogic XLP SoCs:
XLP832, XLP316, XLP208, XLP980, XLP532
Required properties:
- compatible : Should be "netlogic,xlp832-spi".
- #address-cells : Number of cells required to define a chip select address
on the SPI bus.
- #size-cells : Should be zero.
- reg : Should contain register location and length.
- clocks : Phandle of the spi clock
- interrupts : Interrupt number used by this controller.
- interrupt-parent : Phandle of the parent interrupt controller.
SPI slave nodes must be children of the SPI master node and can contain
properties described in Documentation/devicetree/bindings/spi/spi-bus.txt.
Example:
spi: xlp_spi@3a100 {
compatible = "netlogic,xlp832-spi";
#address-cells = <1>;
#size-cells = <0>;
reg = <0 0x3a100 0x100>;
clocks = <&spi_clk>;
interrupts = <34>;
interrupt-parent = <&pic>;
spi_nor@1 {
compatible = "spansion,s25sl12801";
#address-cells = <1>;
#size-cells = <1>;
reg = <1>; /* Chip Select */
spi-max-frequency = <40000000>;
};
};

2
arch/arm/mach-davinci/devices-da8xx.c
View File

@ -1010,11 +1010,13 @@ static struct davinci_spi_platform_data da8xx_spi_pdata[] = {
.version = SPI_VERSION_2,
.intr_line = 1,
.dma_event_q = EVENTQ_0,
.prescaler_limit = 2,
},
[1] = {
.version = SPI_VERSION_2,
.intr_line = 1,
.dma_event_q = EVENTQ_0,
.prescaler_limit = 2,
},
};

1
arch/arm/mach-davinci/dm355.c
View File

@ -411,6 +411,7 @@ static struct davinci_spi_platform_data dm355_spi0_pdata = {
.num_chipselect = 2,
.cshold_bug = true,
.dma_event_q = EVENTQ_1,
.prescaler_limit = 1,
};
static struct platform_device dm355_spi0_device = {
.name = "spi_davinci",

1
arch/arm/mach-davinci/dm365.c
View File

@ -646,6 +646,7 @@ static struct davinci_spi_platform_data dm365_spi0_pdata = {
.version = SPI_VERSION_1,
.num_chipselect = 2,
.dma_event_q = EVENTQ_3,
.prescaler_limit = 1,
};
static struct resource dm365_spi0_resources[] = {

5
arch/powerpc/include/asm/mpc52xx_psc.h
View File

@ -150,7 +150,10 @@
/* Structure of the hardware registers */
struct mpc52xx_psc {
u8 mode; /* PSC + 0x00 */
union {
u8 mode; /* PSC + 0x00 */
u8 mr2;
};
u8 reserved0[3];
union { /* PSC + 0x04 */
u16 status;

20
drivers/spi/Kconfig
View File

@ -326,6 +326,15 @@ config SPI_MESON_SPIFC
This enables master mode support for the SPIFC (SPI flash
controller) available in Amlogic Meson SoCs.
config SPI_MT65XX
tristate "MediaTek SPI controller"
depends on ARCH_MEDIATEK || COMPILE_TEST
help
This selects the MediaTek(R) SPI bus driver.
If you want to use MediaTek(R) SPI interface,
say Y or M here.If you are not sure, say N.
SPI drivers for Mediatek MT65XX and MT81XX series ARM SoCs.
config SPI_OC_TINY
tristate "OpenCores tiny SPI"
depends on GPIOLIB || COMPILE_TEST
@ -598,6 +607,17 @@ config SPI_XILINX
Or for the DS570, see "XPS Serial Peripheral Interface (SPI) (v2.00b)"
config SPI_XLP
tristate "Netlogic XLP SPI controller driver"
depends on CPU_XLP || COMPILE_TEST
help
Enable support for the SPI controller on the Netlogic XLP SoCs.
Currently supported XLP variants are XLP8XX, XLP3XX, XLP2XX, XLP9XX
and XLP5XX.
If you have a Netlogic XLP platform say Y here.
If unsure, say N.
config SPI_XTENSA_XTFPGA
tristate "Xtensa SPI controller for xtfpga"
depends on (XTENSA && XTENSA_PLATFORM_XTFPGA) || COMPILE_TEST

2
drivers/spi/Makefile
View File

@ -48,6 +48,7 @@ obj-$(CONFIG_SPI_MESON_SPIFC) += spi-meson-spifc.o
obj-$(CONFIG_SPI_MPC512x_PSC) += spi-mpc512x-psc.o
obj-$(CONFIG_SPI_MPC52xx_PSC) += spi-mpc52xx-psc.o
obj-$(CONFIG_SPI_MPC52xx) += spi-mpc52xx.o
obj-$(CONFIG_SPI_MT65XX) += spi-mt65xx.o
obj-$(CONFIG_SPI_MXS) += spi-mxs.o
obj-$(CONFIG_SPI_NUC900) += spi-nuc900.o
obj-$(CONFIG_SPI_OC_TINY) += spi-oc-tiny.o
@ -88,5 +89,6 @@ obj-$(CONFIG_SPI_TOPCLIFF_PCH) += spi-topcliff-pch.o
obj-$(CONFIG_SPI_TXX9) += spi-txx9.o
obj-$(CONFIG_SPI_XCOMM) += spi-xcomm.o
obj-$(CONFIG_SPI_XILINX) += spi-xilinx.o
obj-$(CONFIG_SPI_XLP) += spi-xlp.o
obj-$(CONFIG_SPI_XTENSA_XTFPGA) += spi-xtensa-xtfpga.o
obj-$(CONFIG_SPI_ZYNQMP_GQSPI) += spi-zynqmp-gqspi.o

1
drivers/spi/spi-atmel.c
View File

@ -19,7 +19,6 @@
#include <linux/interrupt.h>
#include <linux/spi/spi.h>
#include <linux/slab.h>
#include <linux/platform_data/atmel.h>
#include <linux/platform_data/dma-atmel.h>
#include <linux/of.h>

38
drivers/spi/spi-bcm2835.c
View File

@ -480,7 +480,7 @@ 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)
unsigned long long xfer_time_us)
{
struct bcm2835_spi *bs = spi_master_get_devdata(master);
unsigned long timeout;
@ -531,7 +531,8 @@ static int bcm2835_spi_transfer_one(struct spi_master *master,
{
struct bcm2835_spi *bs = spi_master_get_devdata(master);
unsigned long spi_hz, clk_hz, cdiv;
unsigned long spi_used_hz, xfer_time_us;
unsigned long spi_used_hz;
unsigned long long xfer_time_us;
u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS);
/* set clock */
@ -553,13 +554,11 @@ static int bcm2835_spi_transfer_one(struct spi_master *master,
spi_used_hz = cdiv ? (clk_hz / cdiv) : (clk_hz / 65536);
bcm2835_wr(bs, BCM2835_SPI_CLK, cdiv);
/* handle all the modes */
/* handle all the 3-wire mode */
if ((spi->mode & SPI_3WIRE) && (tfr->rx_buf))
cs |= BCM2835_SPI_CS_REN;
if (spi->mode & SPI_CPOL)
cs |= BCM2835_SPI_CS_CPOL;
if (spi->mode & SPI_CPHA)
cs |= BCM2835_SPI_CS_CPHA;
else
cs &= ~BCM2835_SPI_CS_REN;
/* for gpio_cs set dummy CS so that no HW-CS get changed
* we can not run this in bcm2835_spi_set_cs, as it does
@ -575,9 +574,10 @@ static int bcm2835_spi_transfer_one(struct spi_master *master,
bs->rx_len = tfr->len;
/* calculate the estimated time in us the transfer runs */
xfer_time_us = tfr->len
xfer_time_us = (unsigned long long)tfr->len
* 9 /* clocks/byte - SPI-HW waits 1 clock after each byte */
* 1000000 / spi_used_hz;
* 1000000;
do_div(xfer_time_us, spi_used_hz);
/* for short requests run polling*/
if (xfer_time_us <= BCM2835_SPI_POLLING_LIMIT_US)
@ -592,6 +592,25 @@ static int bcm2835_spi_transfer_one(struct spi_master *master,
return bcm2835_spi_transfer_one_irq(master, spi, tfr, cs);
}
static int bcm2835_spi_prepare_message(struct spi_master *master,
struct spi_message *msg)
{
struct spi_device *spi = msg->spi;
struct bcm2835_spi *bs = spi_master_get_devdata(master);
u32 cs = bcm2835_rd(bs, BCM2835_SPI_CS);
cs &= ~(BCM2835_SPI_CS_CPOL | BCM2835_SPI_CS_CPHA);
if (spi->mode & SPI_CPOL)
cs |= BCM2835_SPI_CS_CPOL;
if (spi->mode & SPI_CPHA)
cs |= BCM2835_SPI_CS_CPHA;
bcm2835_wr(bs, BCM2835_SPI_CS, cs);
return 0;
}
static void bcm2835_spi_handle_err(struct spi_master *master,
struct spi_message *msg)
{
@ -739,6 +758,7 @@ static int bcm2835_spi_probe(struct platform_device *pdev)
master->set_cs = bcm2835_spi_set_cs;
master->transfer_one = bcm2835_spi_transfer_one;
master->handle_err = bcm2835_spi_handle_err;
master->prepare_message = bcm2835_spi_prepare_message;
master->dev.of_node = pdev->dev.of_node;
bs = spi_master_get_devdata(master);

13
drivers/spi/spi-bcm63xx-hsspi.c
View File

@ -76,6 +76,7 @@
#define HSSPI_FIFO_REG(x) (0x200 + (x) * 0x200)
#define HSSPI_OP_MULTIBIT BIT(11)
#define HSSPI_OP_CODE_SHIFT 13
#define HSSPI_OP_SLEEP (0 << HSSPI_OP_CODE_SHIFT)
#define HSSPI_OP_READ_WRITE (1 << HSSPI_OP_CODE_SHIFT)
@ -171,9 +172,12 @@ static int bcm63xx_hsspi_do_txrx(struct spi_device *spi, struct spi_transfer *t)
if (opcode != HSSPI_OP_READ)
step_size -= HSSPI_OPCODE_LEN;
__raw_writel(0 << MODE_CTRL_PREPENDBYTE_CNT_SHIFT |
2 << MODE_CTRL_MULTIDATA_WR_STRT_SHIFT |
2 << MODE_CTRL_MULTIDATA_RD_STRT_SHIFT | 0xff,
if ((opcode == HSSPI_OP_READ && t->rx_nbits == SPI_NBITS_DUAL) ||
(opcode == HSSPI_OP_WRITE && t->tx_nbits == SPI_NBITS_DUAL))
opcode |= HSSPI_OP_MULTIBIT;
__raw_writel(1 << MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT |
1 << MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT | 0xff,
bs->regs + HSSPI_PROFILE_MODE_CTRL_REG(chip_select));
while (pending > 0) {
@ -374,7 +378,8 @@ static int bcm63xx_hsspi_probe(struct platform_device *pdev)
master->num_chipselect = 8;
master->setup = bcm63xx_hsspi_setup;
master->transfer_one_message = bcm63xx_hsspi_transfer_one;
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH |
SPI_RX_DUAL | SPI_TX_DUAL;
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->auto_runtime_pm = true;

4
drivers/spi/spi-bitbang-txrx.h
View File

@ -49,7 +49,7 @@ bitbang_txrx_be_cpha0(struct spi_device *spi,
{
/* if (cpol == 0) this is SPI_MODE_0; else this is SPI_MODE_2 */
bool oldbit = !(word & 1);
u32 oldbit = (!(word & (1<<(bits-1)))) << 31;
/* clock starts at inactive polarity */
for (word <<= (32 - bits); likely(bits); bits--) {
@ -81,7 +81,7 @@ bitbang_txrx_be_cpha1(struct spi_device *spi,
{
/* if (cpol == 0) this is SPI_MODE_1; else this is SPI_MODE_3 */
bool oldbit = !(word & (1 << 31));
u32 oldbit = (!(word & (1<<(bits-1)))) << 31;
/* clock starts at inactive polarity */
for (word <<= (32 - bits); likely(bits); bits--) {

50
drivers/spi/spi-davinci.c
View File

@ -139,6 +139,8 @@ struct davinci_spi {
u32 (*get_tx)(struct davinci_spi *);
u8 *bytes_per_word;
u8 prescaler_limit;
};
static struct davinci_spi_config davinci_spi_default_cfg;
@ -255,7 +257,7 @@ static void davinci_spi_chipselect(struct spi_device *spi, int value)
* This function calculates the prescale value that generates a clock rate
* less than or equal to the specified maximum.
*
* Returns: calculated prescale - 1 for easy programming into SPI registers
* Returns: calculated prescale value for easy programming into SPI registers
* or negative error number if valid prescalar cannot be updated.
*/
static inline int davinci_spi_get_prescale(struct davinci_spi *dspi,
@ -263,12 +265,13 @@ static inline int davinci_spi_get_prescale(struct davinci_spi *dspi,
{
int ret;
ret = DIV_ROUND_UP(clk_get_rate(dspi->clk), max_speed_hz);
/* Subtract 1 to match what will be programmed into SPI register. */
ret = DIV_ROUND_UP(clk_get_rate(dspi->clk), max_speed_hz) - 1;
if (ret < 1 || ret > 256)
if (ret < dspi->prescaler_limit || ret > 255)
return -EINVAL;
return ret - 1;
return ret;
}
/**
@ -832,13 +835,40 @@ rx_dma_failed:
}
#if defined(CONFIG_OF)
/* OF SPI data structure */
struct davinci_spi_of_data {
u8 version;
u8 prescaler_limit;
};
static const struct davinci_spi_of_data dm6441_spi_data = {
.version = SPI_VERSION_1,
.prescaler_limit = 2,
};
static const struct davinci_spi_of_data da830_spi_data = {
.version = SPI_VERSION_2,
.prescaler_limit = 2,
};
static const struct davinci_spi_of_data keystone_spi_data = {
.version = SPI_VERSION_1,
.prescaler_limit = 0,
};
static const struct of_device_id davinci_spi_of_match[] = {
{
.compatible = "ti,dm6441-spi",
.data = &dm6441_spi_data,
},
{
.compatible = "ti,da830-spi",
.data = (void *)SPI_VERSION_2,
.data = &da830_spi_data,
},
{
.compatible = "ti,keystone-spi",
.data = &keystone_spi_data,
},
{ },
};
@ -857,21 +887,21 @@ static int spi_davinci_get_pdata(struct platform_device *pdev,
struct davinci_spi *dspi)
{
struct device_node *node = pdev->dev.of_node;
struct davinci_spi_of_data *spi_data;
struct davinci_spi_platform_data *pdata;
unsigned int num_cs, intr_line = 0;
const struct of_device_id *match;
pdata = &dspi->pdata;
pdata->version = SPI_VERSION_1;
match = of_match_device(davinci_spi_of_match, &pdev->dev);
if (!match)
return -ENODEV;
/* match data has the SPI version number for SPI_VERSION_2 */
if (match->data == (void *)SPI_VERSION_2)
pdata->version = SPI_VERSION_2;
spi_data = (struct davinci_spi_of_data *)match->data;
pdata->version = spi_data->version;
pdata->prescaler_limit = spi_data->prescaler_limit;
/*
* default num_cs is 1 and all chipsel are internal to the chip
* indicated by chip_sel being NULL or cs_gpios being NULL or
@ -991,7 +1021,7 @@ static int davinci_spi_probe(struct platform_device *pdev)
dspi->bitbang.chipselect = davinci_spi_chipselect;
dspi->bitbang.setup_transfer = davinci_spi_setup_transfer;
dspi->prescaler_limit = pdata->prescaler_limit;
dspi->version = pdata->version;
dspi->bitbang.flags = SPI_NO_CS | SPI_LSB_FIRST | SPI_LOOP;

3
drivers/spi/spi-dw-mmio.c
View File

@ -74,6 +74,9 @@ static int dw_spi_mmio_probe(struct platform_device *pdev)
dws->max_freq = clk_get_rate(dwsmmio->clk);
of_property_read_u32(pdev->dev.of_node, "reg-io-width",
&dws->reg_io_width);
num_cs = 4;
if (pdev->dev.of_node)

4
drivers/spi/spi-dw.c
View File

@ -194,7 +194,7 @@ static void dw_writer(struct dw_spi *dws)
else
txw = *(u16 *)(dws->tx);
}
dw_writel(dws, DW_SPI_DR, txw);
dw_write_io_reg(dws, DW_SPI_DR, txw);
dws->tx += dws->n_bytes;
}
}
@ -205,7 +205,7 @@ static void dw_reader(struct dw_spi *dws)
u16 rxw;
while (max--) {
rxw = dw_readl(dws, DW_SPI_DR);
rxw = dw_read_io_reg(dws, DW_SPI_DR);
/* Care rx only if the transfer's original "rx" is not null */
if (dws->rx_end - dws->len) {
if (dws->n_bytes == 1)

35
drivers/spi/spi-dw.h
View File

@ -109,6 +109,7 @@ struct dw_spi {
u32 fifo_len; /* depth of the FIFO buffer */
u32 max_freq; /* max bus freq supported */
u32 reg_io_width; /* DR I/O width in bytes */
u16 bus_num;
u16 num_cs; /* supported slave numbers */
@ -145,11 +146,45 @@ static inline u32 dw_readl(struct dw_spi *dws, u32 offset)
return __raw_readl(dws->regs + offset);
}
static inline u16 dw_readw(struct dw_spi *dws, u32 offset)
{
return __raw_readw(dws->regs + offset);
}
static inline void dw_writel(struct dw_spi *dws, u32 offset, u32 val)
{
__raw_writel(val, dws->regs + offset);
}
static inline void dw_writew(struct dw_spi *dws, u32 offset, u16 val)
{
__raw_writew(val, dws->regs + offset);
}
static inline u32 dw_read_io_reg(struct dw_spi *dws, u32 offset)
{
switch (dws->reg_io_width) {
case 2:
return dw_readw(dws, offset);
case 4:
default:
return dw_readl(dws, offset);
}
}
static inline void dw_write_io_reg(struct dw_spi *dws, u32 offset, u32 val)
{
switch (dws->reg_io_width) {
case 2:
dw_writew(dws, offset, val);
break;
case 4:
default:
dw_writel(dws, offset, val);
break;
}
}
static inline void spi_enable_chip(struct dw_spi *dws, int enable)
{
dw_writel(dws, DW_SPI_SSIENR, (enable ? 1 : 0));

89
drivers/spi/spi-fsl-espi.c
View File

@ -21,6 +21,7 @@
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <linux/pm_runtime.h>
#include <sysdev/fsl_soc.h>
#include "spi-fsl-lib.h"
@ -85,6 +86,8 @@ struct fsl_espi_transfer {
#define SPCOM_TRANLEN(x) ((x) << 0)
#define SPCOM_TRANLEN_MAX 0xFFFF /* Max transaction length */
#define AUTOSUSPEND_TIMEOUT 2000
static void fsl_espi_change_mode(struct spi_device *spi)
{
struct mpc8xxx_spi *mspi = spi_master_get_devdata(spi->master);
@ -485,6 +488,8 @@ static int fsl_espi_setup(struct spi_device *spi)
mpc8xxx_spi = spi_master_get_devdata(spi->master);
reg_base = mpc8xxx_spi->reg_base;
pm_runtime_get_sync(mpc8xxx_spi->dev);
hw_mode = cs->hw_mode; /* Save original settings */
cs->hw_mode = mpc8xxx_spi_read_reg(
&reg_base->csmode[spi->chip_select]);
@ -507,6 +512,10 @@ static int fsl_espi_setup(struct spi_device *spi)
mpc8xxx_spi_write_reg(&reg_base->mode, loop_mode);
retval = fsl_espi_setup_transfer(spi, NULL);
pm_runtime_mark_last_busy(mpc8xxx_spi->dev);
pm_runtime_put_autosuspend(mpc8xxx_spi->dev);
if (retval < 0) {
cs->hw_mode = hw_mode; /* Restore settings */
return retval;
@ -604,20 +613,14 @@ static irqreturn_t fsl_espi_irq(s32 irq, void *context_data)
return ret;
}
static void fsl_espi_remove(struct mpc8xxx_spi *mspi)
#ifdef CONFIG_PM
static int fsl_espi_runtime_suspend(struct device *dev)
{
iounmap(mspi->reg_base);
}
static int fsl_espi_suspend(struct spi_master *master)
{
struct mpc8xxx_spi *mpc8xxx_spi;
struct fsl_espi_reg *reg_base;
struct spi_master *master = dev_get_drvdata(dev);
struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base;
u32 regval;
mpc8xxx_spi = spi_master_get_devdata(master);
reg_base = mpc8xxx_spi->reg_base;
regval = mpc8xxx_spi_read_reg(&reg_base->mode);
regval &= ~SPMODE_ENABLE;
mpc8xxx_spi_write_reg(&reg_base->mode, regval);
@ -625,21 +628,20 @@ static int fsl_espi_suspend(struct spi_master *master)
return 0;
}
static int fsl_espi_resume(struct spi_master *master)
static int fsl_espi_runtime_resume(struct device *dev)
{
struct mpc8xxx_spi *mpc8xxx_spi;
struct fsl_espi_reg *reg_base;
struct spi_master *master = dev_get_drvdata(dev);
struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
struct fsl_espi_reg *reg_base = mpc8xxx_spi->reg_base;
u32 regval;
mpc8xxx_spi = spi_master_get_devdata(master);
reg_base = mpc8xxx_spi->reg_base;
regval = mpc8xxx_spi_read_reg(&reg_base->mode);
regval |= SPMODE_ENABLE;
mpc8xxx_spi_write_reg(&reg_base->mode, regval);
return 0;
}
#endif
static struct spi_master * fsl_espi_probe(struct device *dev,
struct resource *mem, unsigned int irq)
@ -667,25 +669,23 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
master->setup = fsl_espi_setup;
master->cleanup = fsl_espi_cleanup;
master->transfer_one_message = fsl_espi_do_one_msg;
master->prepare_transfer_hardware = fsl_espi_resume;
master->unprepare_transfer_hardware = fsl_espi_suspend;
master->auto_runtime_pm = true;
mpc8xxx_spi = spi_master_get_devdata(master);
mpc8xxx_spi->spi_remove = fsl_espi_remove;
mpc8xxx_spi->reg_base = ioremap(mem->start, resource_size(mem));
if (!mpc8xxx_spi->reg_base) {
ret = -ENOMEM;
mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem);
if (IS_ERR(mpc8xxx_spi->reg_base)) {
ret = PTR_ERR(mpc8xxx_spi->reg_base);
goto err_probe;
}
reg_base = mpc8xxx_spi->reg_base;
/* Register for SPI Interrupt */
ret = request_irq(mpc8xxx_spi->irq, fsl_espi_irq,
ret = devm_request_irq(dev, mpc8xxx_spi->irq, fsl_espi_irq,
0, "fsl_espi", mpc8xxx_spi);
if (ret)
goto free_irq;
goto err_probe;
if (mpc8xxx_spi->flags & SPI_QE_CPU_MODE) {
mpc8xxx_spi->rx_shift = 16;
@ -731,18 +731,27 @@ static struct spi_master * fsl_espi_probe(struct device *dev,
mpc8xxx_spi_write_reg(&reg_base->mode, regval);
ret = spi_register_master(master);
pm_runtime_set_autosuspend_delay(dev, AUTOSUSPEND_TIMEOUT);
pm_runtime_use_autosuspend(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
pm_runtime_get_sync(dev);
ret = devm_spi_register_master(dev, master);
if (ret < 0)
goto unreg_master;
goto err_pm;
dev_info(dev, "at 0x%p (irq = %d)\n", reg_base, mpc8xxx_spi->irq);
pm_runtime_mark_last_busy(dev);
pm_runtime_put_autosuspend(dev);
return master;
unreg_master:
free_irq(mpc8xxx_spi->irq, mpc8xxx_spi);
free_irq:
iounmap(mpc8xxx_spi->reg_base);
err_pm:
pm_runtime_put_noidle(dev);
pm_runtime_disable(dev);
pm_runtime_set_suspended(dev);
err_probe:
spi_master_put(master);
err:
@ -809,7 +818,9 @@ err:
static int of_fsl_espi_remove(struct platform_device *dev)
{
return mpc8xxx_spi_remove(&dev->dev);
pm_runtime_disable(&dev->dev);
return 0;
}
#ifdef CONFIG_PM_SLEEP
@ -824,7 +835,11 @@ static int of_fsl_espi_suspend(struct device *dev)
return ret;
}
return fsl_espi_suspend(master);
ret = pm_runtime_force_suspend(dev);
if (ret < 0)
return ret;
return 0;
}
static int of_fsl_espi_resume(struct device *dev)
@ -834,7 +849,7 @@ static int of_fsl_espi_resume(struct device *dev)
struct mpc8xxx_spi *mpc8xxx_spi;
struct fsl_espi_reg *reg_base;
u32 regval;
int i;
int i, ret;
mpc8xxx_spi = spi_master_get_devdata(master);
reg_base = mpc8xxx_spi->reg_base;
@ -854,11 +869,17 @@ static int of_fsl_espi_resume(struct device *dev)
mpc8xxx_spi_write_reg(&reg_base->mode, regval);
ret = pm_runtime_force_resume(dev);
if (ret < 0)
return ret;
return spi_master_resume(master);
}
#endif /* CONFIG_PM_SLEEP */
static const struct dev_pm_ops espi_pm = {
SET_RUNTIME_PM_OPS(fsl_espi_runtime_suspend,
fsl_espi_runtime_resume, NULL)
SET_SYSTEM_SLEEP_PM_OPS(of_fsl_espi_suspend, of_fsl_espi_resume)
};

19
drivers/spi/spi-fsl-lib.c
View File

@ -114,25 +114,6 @@ void mpc8xxx_spi_probe(struct device *dev, struct resource *mem,
}
EXPORT_SYMBOL_GPL(mpc8xxx_spi_probe);
int mpc8xxx_spi_remove(struct device *dev)
{
struct mpc8xxx_spi *mpc8xxx_spi;
struct spi_master *master;
master = dev_get_drvdata(dev);
mpc8xxx_spi = spi_master_get_devdata(master);
spi_unregister_master(master);
free_irq(mpc8xxx_spi->irq, mpc8xxx_spi);
if (mpc8xxx_spi->spi_remove)
mpc8xxx_spi->spi_remove(mpc8xxx_spi);
return 0;
}
EXPORT_SYMBOL_GPL(mpc8xxx_spi_remove);
int of_mpc8xxx_spi_probe(struct platform_device *ofdev)
{
struct device *dev = &ofdev->dev;

3
drivers/spi/spi-fsl-lib.h
View File

@ -54,9 +54,6 @@ struct mpc8xxx_spi {
void (*get_rx) (u32 rx_data, struct mpc8xxx_spi *);
u32(*get_tx) (struct mpc8xxx_spi *);
/* hooks for different controller driver */
void (*spi_remove) (struct mpc8xxx_spi *mspi);
unsigned int count;
unsigned int irq;

43
drivers/spi/spi-fsl-spi.c
View File

@ -559,12 +559,6 @@ static irqreturn_t fsl_spi_irq(s32 irq, void *context_data)
return ret;
}
static void fsl_spi_remove(struct mpc8xxx_spi *mspi)
{
iounmap(mspi->reg_base);
fsl_spi_cpm_free(mspi);
}
static void fsl_spi_grlib_cs_control(struct spi_device *spi, bool on)
{
struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(spi->master);
@ -631,7 +625,6 @@ static struct spi_master * fsl_spi_probe(struct device *dev,
master->transfer_one_message = fsl_spi_do_one_msg;
mpc8xxx_spi = spi_master_get_devdata(master);
mpc8xxx_spi->spi_remove = fsl_spi_remove;
mpc8xxx_spi->max_bits_per_word = 32;
mpc8xxx_spi->type = fsl_spi_get_type(dev);
@ -639,10 +632,10 @@ static struct spi_master * fsl_spi_probe(struct device *dev,
if (ret)
goto err_cpm_init;
mpc8xxx_spi->reg_base = ioremap(mem->start, resource_size(mem));
if (mpc8xxx_spi->reg_base == NULL) {
ret = -ENOMEM;
goto err_ioremap;
mpc8xxx_spi->reg_base = devm_ioremap_resource(dev, mem);
if (IS_ERR(mpc8xxx_spi->reg_base)) {
ret = PTR_ERR(mpc8xxx_spi->reg_base);
goto err_probe;
}
if (mpc8xxx_spi->type == TYPE_GRLIB)
@ -661,11 +654,11 @@ static struct spi_master * fsl_spi_probe(struct device *dev,
&mpc8xxx_spi->tx_shift, 8, 1);
/* Register for SPI Interrupt */
ret = request_irq(mpc8xxx_spi->irq, fsl_spi_irq,
0, "fsl_spi", mpc8xxx_spi);
ret = devm_request_irq(dev, mpc8xxx_spi->irq, fsl_spi_irq,
0, "fsl_spi", mpc8xxx_spi);
if (ret != 0)
goto free_irq;
goto err_probe;
reg_base = mpc8xxx_spi->reg_base;
@ -686,20 +679,16 @@ static struct spi_master * fsl_spi_probe(struct device *dev,
mpc8xxx_spi_write_reg(&reg_base->mode, regval);
ret = spi_register_master(master);
ret = devm_spi_register_master(dev, master);
if (ret < 0)
goto unreg_master;
goto err_probe;
dev_info(dev, "at 0x%p (irq = %d), %s mode\n", reg_base,
mpc8xxx_spi->irq, mpc8xxx_spi_strmode(mpc8xxx_spi->flags));
return master;
unreg_master:
free_irq(mpc8xxx_spi->irq, mpc8xxx_spi);
free_irq:
iounmap(mpc8xxx_spi->reg_base);
err_ioremap:
err_probe:
fsl_spi_cpm_free(mpc8xxx_spi);
err_cpm_init:
spi_master_put(master);
@ -866,11 +855,8 @@ static int of_fsl_spi_remove(struct platform_device *ofdev)
{
struct spi_master *master = platform_get_drvdata(ofdev);
struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
int ret;
ret = mpc8xxx_spi_remove(&ofdev->dev);
if (ret)
return ret;
fsl_spi_cpm_free(mpc8xxx_spi);
if (mpc8xxx_spi->type == TYPE_FSL)
of_fsl_spi_free_chipselects(&ofdev->dev);
return 0;
@ -916,7 +902,12 @@ static int plat_mpc8xxx_spi_probe(struct platform_device *pdev)
static int plat_mpc8xxx_spi_remove(struct platform_device *pdev)
{
return mpc8xxx_spi_remove(&pdev->dev);
struct spi_master *master = platform_get_drvdata(pdev);
struct mpc8xxx_spi *mpc8xxx_spi = spi_master_get_devdata(master);
fsl_spi_cpm_free(mpc8xxx_spi);
return 0;
}
MODULE_ALIAS("platform:mpc8xxx_spi");

69
drivers/spi/spi-img-spfi.c
View File

@ -105,6 +105,10 @@ struct img_spfi {
bool rx_dma_busy;
};
struct img_spfi_device_data {
bool gpio_requested;
};
static inline u32 spfi_readl(struct img_spfi *spfi, u32 reg)
{
return readl(spfi->regs + reg);
@ -267,15 +271,15 @@ static int img_spfi_start_pio(struct spi_master *master,
cpu_relax();
}
ret = spfi_wait_all_done(spfi);
if (ret < 0)
return ret;
if (rx_bytes > 0 || tx_bytes > 0) {
dev_err(spfi->dev, "PIO transfer timed out\n");
return -ETIMEDOUT;
}
ret = spfi_wait_all_done(spfi);
if (ret < 0)
return ret;
return 0;
}
@ -440,21 +444,50 @@ static int img_spfi_unprepare(struct spi_master *master,
static int img_spfi_setup(struct spi_device *spi)
{
int ret;
int ret = -EINVAL;
struct img_spfi_device_data *spfi_data = spi_get_ctldata(spi);
ret = gpio_request_one(spi->cs_gpio, (spi->mode & SPI_CS_HIGH) ?
GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
dev_name(&spi->dev));
if (ret)
dev_err(&spi->dev, "can't request chipselect gpio %d\n",
if (!spfi_data) {
spfi_data = kzalloc(sizeof(*spfi_data), GFP_KERNEL);
if (!spfi_data)
return -ENOMEM;
spfi_data->gpio_requested = false;
spi_set_ctldata(spi, spfi_data);
}
if (!spfi_data->gpio_requested) {
ret = gpio_request_one(spi->cs_gpio,
(spi->mode & SPI_CS_HIGH) ?
GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH,
dev_name(&spi->dev));
if (ret)
dev_err(&spi->dev, "can't request chipselect gpio %d\n",
spi->cs_gpio);
else
spfi_data->gpio_requested = true;
} else {
if (gpio_is_valid(spi->cs_gpio)) {
int mode = ((spi->mode & SPI_CS_HIGH) ?
GPIOF_OUT_INIT_LOW : GPIOF_OUT_INIT_HIGH);
ret = gpio_direction_output(spi->cs_gpio, mode);
if (ret)
dev_err(&spi->dev, "chipselect gpio %d setup failed (%d)\n",
spi->cs_gpio, ret);
}
}
return ret;
}
static void img_spfi_cleanup(struct spi_device *spi)
{
gpio_free(spi->cs_gpio);
struct img_spfi_device_data *spfi_data = spi_get_ctldata(spi);
if (spfi_data) {
if (spfi_data->gpio_requested)
gpio_free(spi->cs_gpio);
kfree(spfi_data);
spi_set_ctldata(spi, NULL);
}
}
static void img_spfi_config(struct spi_master *master, struct spi_device *spi,
@ -548,6 +581,7 @@ static int img_spfi_probe(struct platform_device *pdev)
struct img_spfi *spfi;
struct resource *res;
int ret;
u32 max_speed_hz;
master = spi_alloc_master(&pdev->dev, sizeof(*spfi));
if (!master)
@ -612,6 +646,19 @@ static int img_spfi_probe(struct platform_device *pdev)
master->max_speed_hz = clk_get_rate(spfi->spfi_clk) / 4;
master->min_speed_hz = clk_get_rate(spfi->spfi_clk) / 512;
/*
* Maximum speed supported by spfi is limited to the lower value
* between 1/4 of the SPFI clock or to "spfi-max-frequency"
* defined in the device tree.
* If no value is defined in the device tree assume the maximum
* speed supported to be 1/4 of the SPFI clock.
*/
if (!of_property_read_u32(spfi->dev->of_node, "spfi-max-frequency",
&max_speed_hz)) {
if (master->max_speed_hz > max_speed_hz)
master->max_speed_hz = max_speed_hz;
}
master->setup = img_spfi_setup;
master->cleanup = img_spfi_cleanup;
master->transfer_one = img_spfi_transfer_one;

70
drivers/spi/spi-mpc512x-psc.c
View File

@ -30,11 +30,37 @@
#include <linux/gpio.h>
#include <asm/mpc52xx_psc.h>
enum {
TYPE_MPC5121,
TYPE_MPC5125,
};
/*
* This macro abstracts the differences in the PSC register layout between
* MPC5121 (which uses a struct mpc52xx_psc) and MPC5125 (using mpc5125_psc).
*/
#define psc_addr(mps, regname) ({ \
void *__ret = NULL; \
switch (mps->type) { \
case TYPE_MPC5121: { \
struct mpc52xx_psc __iomem *psc = mps->psc; \
__ret = &psc->regname; \
}; \
break; \
case TYPE_MPC5125: { \
struct mpc5125_psc __iomem *psc = mps->psc; \
__ret = &psc->regname; \
}; \
break; \
} \
__ret; })
struct mpc512x_psc_spi {
void (*cs_control)(struct spi_device *spi, bool on);
/* driver internal data */
struct mpc52xx_psc __iomem *psc;
int type;
void __iomem *psc;
struct mpc512x_psc_fifo __iomem *fifo;
unsigned int irq;
u8 bits_per_word;
@ -71,13 +97,12 @@ static void mpc512x_psc_spi_activate_cs(struct spi_device *spi)
{
struct mpc512x_psc_spi_cs *cs = spi->controller_state;
struct mpc512x_psc_spi *mps = spi_master_get_devdata(spi->master);
struct mpc52xx_psc __iomem *psc = mps->psc;
u32 sicr;
u32 ccr;
int speed;
u16 bclkdiv;
sicr = in_be32(&psc->sicr);
sicr = in_be32(psc_addr(mps, sicr));
/* Set clock phase and polarity */
if (spi->mode & SPI_CPHA)
@ -94,9 +119,9 @@ static void mpc512x_psc_spi_activate_cs(struct spi_device *spi)
sicr |= 0x10000000;
else
sicr &= ~0x10000000;
out_be32(&psc->sicr, sicr);
out_be32(psc_addr(mps, sicr), sicr);
ccr = in_be32(&psc->ccr);
ccr = in_be32(psc_addr(mps, ccr));
ccr &= 0xFF000000;
speed = cs->speed_hz;
if (!speed)
@ -104,7 +129,7 @@ static void mpc512x_psc_spi_activate_cs(struct spi_device *spi)
bclkdiv = (mps->mclk_rate / speed) - 1;
ccr |= (((bclkdiv & 0xff) << 16) | (((bclkdiv >> 8) & 0xff) << 8));
out_be32(&psc->ccr, ccr);
out_be32(psc_addr(mps, ccr), ccr);
mps->bits_per_word = cs->bits_per_word;
if (mps->cs_control && gpio_is_valid(spi->cs_gpio))
@ -315,16 +340,15 @@ static int mpc512x_psc_spi_msg_xfer(struct spi_master *master,
static int mpc512x_psc_spi_prep_xfer_hw(struct spi_master *master)
{
struct mpc512x_psc_spi *mps = spi_master_get_devdata(master);
struct mpc52xx_psc __iomem *psc = mps->psc;
dev_dbg(&master->dev, "%s()\n", __func__);
/* Zero MR2 */
in_8(&psc->mode);
out_8(&psc->mode, 0x0);
in_8(psc_addr(mps, mr2));
out_8(psc_addr(mps, mr2), 0x0);
/* enable transmitter/receiver */
out_8(&psc->command, MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
out_8(psc_addr(mps, command), MPC52xx_PSC_TX_ENABLE | MPC52xx_PSC_RX_ENABLE);
return 0;
}
@ -332,13 +356,12 @@ static int mpc512x_psc_spi_prep_xfer_hw(struct spi_master *master)
static int mpc512x_psc_spi_unprep_xfer_hw(struct spi_master *master)
{
struct mpc512x_psc_spi *mps = spi_master_get_devdata(master);
struct mpc52xx_psc __iomem *psc = mps->psc;
struct mpc512x_psc_fifo __iomem *fifo = mps->fifo;
dev_dbg(&master->dev, "%s()\n", __func__);
/* disable transmitter/receiver and fifo interrupt */
out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
out_8(psc_addr(mps, command), MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
out_be32(&fifo->tximr, 0);
return 0;
@ -388,7 +411,6 @@ static void mpc512x_psc_spi_cleanup(struct spi_device *spi)
static int mpc512x_psc_spi_port_config(struct spi_master *master,
struct mpc512x_psc_spi *mps)
{
struct mpc52xx_psc __iomem *psc = mps->psc;
struct mpc512x_psc_fifo __iomem *fifo = mps->fifo;
u32 sicr;
u32 ccr;
@ -396,12 +418,12 @@ static int mpc512x_psc_spi_port_config(struct spi_master *master,
u16 bclkdiv;
/* Reset the PSC into a known state */
out_8(&psc->command, MPC52xx_PSC_RST_RX);
out_8(&psc->command, MPC52xx_PSC_RST_TX);
out_8(&psc->command, MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
out_8(psc_addr(mps, command), MPC52xx_PSC_RST_RX);
out_8(psc_addr(mps, command), MPC52xx_PSC_RST_TX);
out_8(psc_addr(mps, command), MPC52xx_PSC_TX_DISABLE | MPC52xx_PSC_RX_DISABLE);
/* Disable psc interrupts all useful interrupts are in fifo */
out_be16(&psc->isr_imr.imr, 0);
out_be16(psc_addr(mps, isr_imr.imr), 0);
/* Disable fifo interrupts, will be enabled later */
out_be32(&fifo->tximr, 0);
@ -417,18 +439,18 @@ static int mpc512x_psc_spi_port_config(struct spi_master *master,
0x00004000 | /* MSTR = 1 -- SPI master */
0x00000800; /* UseEOF = 1 -- SS low until EOF */
out_be32(&psc->sicr, sicr);
out_be32(psc_addr(mps, sicr), sicr);
ccr = in_be32(&psc->ccr);
ccr = in_be32(psc_addr(mps, ccr));
ccr &= 0xFF000000;
speed = 1000000; /* default 1MHz */
bclkdiv = (mps->mclk_rate / speed) - 1;
ccr |= (((bclkdiv & 0xff) << 16) | (((bclkdiv >> 8) & 0xff) << 8));
out_be32(&psc->ccr, ccr);
out_be32(psc_addr(mps, ccr), ccr);
/* Set 2ms DTL delay */
out_8(&psc->ctur, 0x00);
out_8(&psc->ctlr, 0x82);
out_8(psc_addr(mps, ctur), 0x00);
out_8(psc_addr(mps, ctlr), 0x82);
/* we don't use the alarms */
out_be32(&fifo->rxalarm, 0xfff);
@ -482,6 +504,7 @@ static int mpc512x_psc_spi_do_probe(struct device *dev, u32 regaddr,
dev_set_drvdata(dev, master);
mps = spi_master_get_devdata(master);
mps->type = (int)of_device_get_match_data(dev);
mps->irq = irq;
if (pdata == NULL) {
@ -589,7 +612,8 @@ static int mpc512x_psc_spi_of_remove(struct platform_device *op)
}
static const struct of_device_id mpc512x_psc_spi_of_match[] = {
{ .compatible = "fsl,mpc5121-psc-spi", },
{ .compatible = "fsl,mpc5121-psc-spi", .data = (void *)TYPE_MPC5121 },
{ .compatible = "fsl,mpc5125-psc-spi", .data = (void *)TYPE_MPC5125 },
{},
};

726
drivers/spi/spi-mt65xx.c Normal file
View File

@ -0,0 +1,726 @@
/*
* Copyright (c) 2015 MediaTek Inc.
* Author: Leilk Liu <leilk.liu@mediatek.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
* 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/clk.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/ioport.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/platform_data/spi-mt65xx.h>
#include <linux/pm_runtime.h>
#include <linux/spi/spi.h>
#define SPI_CFG0_REG 0x0000
#define SPI_CFG1_REG 0x0004
#define SPI_TX_SRC_REG 0x0008
#define SPI_RX_DST_REG 0x000c
#define SPI_TX_DATA_REG 0x0010
#define SPI_RX_DATA_REG 0x0014
#define SPI_CMD_REG 0x0018
#define SPI_STATUS0_REG 0x001c
#define SPI_PAD_SEL_REG 0x0024
#define SPI_CFG0_SCK_HIGH_OFFSET 0
#define SPI_CFG0_SCK_LOW_OFFSET 8
#define SPI_CFG0_CS_HOLD_OFFSET 16
#define SPI_CFG0_CS_SETUP_OFFSET 24
#define SPI_CFG1_CS_IDLE_OFFSET 0
#define SPI_CFG1_PACKET_LOOP_OFFSET 8
#define SPI_CFG1_PACKET_LENGTH_OFFSET 16
#define SPI_CFG1_GET_TICK_DLY_OFFSET 30
#define SPI_CFG1_CS_IDLE_MASK 0xff
#define SPI_CFG1_PACKET_LOOP_MASK 0xff00
#define SPI_CFG1_PACKET_LENGTH_MASK 0x3ff0000
#define SPI_CMD_ACT BIT(0)
#define SPI_CMD_RESUME BIT(1)
#define SPI_CMD_RST BIT(2)
#define SPI_CMD_PAUSE_EN BIT(4)
#define SPI_CMD_DEASSERT BIT(5)
#define SPI_CMD_CPHA BIT(8)
#define SPI_CMD_CPOL BIT(9)
#define SPI_CMD_RX_DMA BIT(10)
#define SPI_CMD_TX_DMA BIT(11)
#define SPI_CMD_TXMSBF BIT(12)
#define SPI_CMD_RXMSBF BIT(13)
#define SPI_CMD_RX_ENDIAN BIT(14)
#define SPI_CMD_TX_ENDIAN BIT(15)
#define SPI_CMD_FINISH_IE BIT(16)
#define SPI_CMD_PAUSE_IE BIT(17)
#define MT8173_SPI_MAX_PAD_SEL 3
#define MTK_SPI_PAUSE_INT_STATUS 0x2
#define MTK_SPI_IDLE 0
#define MTK_SPI_PAUSED 1
#define MTK_SPI_MAX_FIFO_SIZE 32
#define MTK_SPI_PACKET_SIZE 1024
struct mtk_spi_compatible {
bool need_pad_sel;
/* Must explicitly send dummy Tx bytes to do Rx only transfer */
bool must_tx;
};
struct mtk_spi {
void __iomem *base;
u32 state;
u32 pad_sel;
struct clk *spi_clk, *parent_clk;
struct spi_transfer *cur_transfer;
u32 xfer_len;
struct scatterlist *tx_sgl, *rx_sgl;
u32 tx_sgl_len, rx_sgl_len;
const struct mtk_spi_compatible *dev_comp;
};
static const struct mtk_spi_compatible mt6589_compat;
static const struct mtk_spi_compatible mt8135_compat;
static const struct mtk_spi_compatible mt8173_compat = {
.need_pad_sel = true,
.must_tx = true,
};
/*
* A piece of default chip info unless the platform
* supplies it.
*/
static const struct mtk_chip_config mtk_default_chip_info = {
.rx_mlsb = 1,
.tx_mlsb = 1,
};
static const struct of_device_id mtk_spi_of_match[] = {
{ .compatible = "mediatek,mt6589-spi", .data = (void *)&mt6589_compat },
{ .compatible = "mediatek,mt8135-spi", .data = (void *)&mt8135_compat },
{ .compatible = "mediatek,mt8173-spi", .data = (void *)&mt8173_compat },
{}
};
MODULE_DEVICE_TABLE(of, mtk_spi_of_match);
static void mtk_spi_reset(struct mtk_spi *mdata)
{
u32 reg_val;
/* set the software reset bit in SPI_CMD_REG. */
reg_val = readl(mdata->base + SPI_CMD_REG);
reg_val |= SPI_CMD_RST;
writel(reg_val, mdata->base + SPI_CMD_REG);
reg_val = readl(mdata->base + SPI_CMD_REG);
reg_val &= ~SPI_CMD_RST;
writel(reg_val, mdata->base + SPI_CMD_REG);
}
static void mtk_spi_config(struct mtk_spi *mdata,
struct mtk_chip_config *chip_config)
{
u32 reg_val;
reg_val = readl(mdata->base + SPI_CMD_REG);
/* set the mlsbx and mlsbtx */
if (chip_config->tx_mlsb)
reg_val |= SPI_CMD_TXMSBF;
else
reg_val &= ~SPI_CMD_TXMSBF;
if (chip_config->rx_mlsb)
reg_val |= SPI_CMD_RXMSBF;
else
reg_val &= ~SPI_CMD_RXMSBF;
/* set the tx/rx endian */
#ifdef __LITTLE_ENDIAN
reg_val &= ~SPI_CMD_TX_ENDIAN;
reg_val &= ~SPI_CMD_RX_ENDIAN;
#else
reg_val |= SPI_CMD_TX_ENDIAN;
reg_val |= SPI_CMD_RX_ENDIAN;
#endif
/* set finish and pause interrupt always enable */
reg_val |= SPI_CMD_FINISH_IE | SPI_CMD_PAUSE_IE;
/* disable dma mode */
reg_val &= ~(SPI_CMD_TX_DMA | SPI_CMD_RX_DMA);
/* disable deassert mode */
reg_val &= ~SPI_CMD_DEASSERT;
writel(reg_val, mdata->base + SPI_CMD_REG);
/* pad select */
if (mdata->dev_comp->need_pad_sel)
writel(mdata->pad_sel, mdata->base + SPI_PAD_SEL_REG);
}
static int mtk_spi_prepare_hardware(struct spi_master *master)
{
struct spi_transfer *trans;
struct mtk_spi *mdata = spi_master_get_devdata(master);
struct spi_message *msg = master->cur_msg;
trans = list_first_entry(&msg->transfers, struct spi_transfer,
transfer_list);
if (!trans->cs_change) {
mdata->state = MTK_SPI_IDLE;
mtk_spi_reset(mdata);
}
return 0;
}
static int mtk_spi_prepare_message(struct spi_master *master,
struct spi_message *msg)
{
u32 reg_val;
u8 cpha, cpol;
struct mtk_chip_config *chip_config;
struct spi_device *spi = msg->spi;
struct mtk_spi *mdata = spi_master_get_devdata(master);
cpha = spi->mode & SPI_CPHA ? 1 : 0;
cpol = spi->mode & SPI_CPOL ? 1 : 0;
reg_val = readl(mdata->base + SPI_CMD_REG);
if (cpha)
reg_val |= SPI_CMD_CPHA;
else
reg_val &= ~SPI_CMD_CPHA;
if (cpol)
reg_val |= SPI_CMD_CPOL;
else
reg_val &= ~SPI_CMD_CPOL;
writel(reg_val, mdata->base + SPI_CMD_REG);
chip_config = spi->controller_data;
if (!chip_config) {
chip_config = (void *)&mtk_default_chip_info;
spi->controller_data = chip_config;
}
mtk_spi_config(mdata, chip_config);
return 0;
}
static void mtk_spi_set_cs(struct spi_device *spi, bool enable)
{
u32 reg_val;
struct mtk_spi *mdata = spi_master_get_devdata(spi->master);
reg_val = readl(mdata->base + SPI_CMD_REG);
if (!enable)
reg_val |= SPI_CMD_PAUSE_EN;
else
reg_val &= ~SPI_CMD_PAUSE_EN;
writel(reg_val, mdata->base + SPI_CMD_REG);
}
static void mtk_spi_prepare_transfer(struct spi_master *master,
struct spi_transfer *xfer)
{
u32 spi_clk_hz, div, sck_time, cs_time, reg_val = 0;
struct mtk_spi *mdata = spi_master_get_devdata(master);
spi_clk_hz = clk_get_rate(mdata->spi_clk);
if (xfer->speed_hz < spi_clk_hz / 2)
div = DIV_ROUND_UP(spi_clk_hz, xfer->speed_hz);
else
div = 1;
sck_time = (div + 1) / 2;
cs_time = sck_time * 2;
reg_val |= (((sck_time - 1) & 0xff) << SPI_CFG0_SCK_HIGH_OFFSET);
reg_val |= (((sck_time - 1) & 0xff) << SPI_CFG0_SCK_LOW_OFFSET);
reg_val |= (((cs_time - 1) & 0xff) << SPI_CFG0_CS_HOLD_OFFSET);
reg_val |= (((cs_time - 1) & 0xff) << SPI_CFG0_CS_SETUP_OFFSET);
writel(reg_val, mdata->base + SPI_CFG0_REG);
reg_val = readl(mdata->base + SPI_CFG1_REG);
reg_val &= ~SPI_CFG1_CS_IDLE_MASK;
reg_val |= (((cs_time - 1) & 0xff) << SPI_CFG1_CS_IDLE_OFFSET);
writel(reg_val, mdata->base + SPI_CFG1_REG);
}
static void mtk_spi_setup_packet(struct spi_master *master)
{
u32 packet_size, packet_loop, reg_val;
struct mtk_spi *mdata = spi_master_get_devdata(master);
packet_size = min_t(u32, mdata->xfer_len, MTK_SPI_PACKET_SIZE);
packet_loop = mdata->xfer_len / packet_size;
reg_val = readl(mdata->base + SPI_CFG1_REG);
reg_val &= ~(SPI_CFG1_PACKET_LENGTH_MASK | SPI_CFG1_PACKET_LOOP_MASK);
reg_val |= (packet_size - 1) << SPI_CFG1_PACKET_LENGTH_OFFSET;
reg_val |= (packet_loop - 1) << SPI_CFG1_PACKET_LOOP_OFFSET;
writel(reg_val, mdata->base + SPI_CFG1_REG);
}
static void mtk_spi_enable_transfer(struct spi_master *master)
{
u32 cmd;
struct mtk_spi *mdata = spi_master_get_devdata(master);
cmd = readl(mdata->base + SPI_CMD_REG);
if (mdata->state == MTK_SPI_IDLE)
cmd |= SPI_CMD_ACT;
else
cmd |= SPI_CMD_RESUME;
writel(cmd, mdata->base + SPI_CMD_REG);
}
static int mtk_spi_get_mult_delta(u32 xfer_len)
{
u32 mult_delta;
if (xfer_len > MTK_SPI_PACKET_SIZE)
mult_delta = xfer_len % MTK_SPI_PACKET_SIZE;
else
mult_delta = 0;
return mult_delta;
}
static void mtk_spi_update_mdata_len(struct spi_master *master)
{
int mult_delta;
struct mtk_spi *mdata = spi_master_get_devdata(master);
if (mdata->tx_sgl_len && mdata->rx_sgl_len) {
if (mdata->tx_sgl_len > mdata->rx_sgl_len) {
mult_delta = mtk_spi_get_mult_delta(mdata->rx_sgl_len);
mdata->xfer_len = mdata->rx_sgl_len - mult_delta;
mdata->rx_sgl_len = mult_delta;
mdata->tx_sgl_len -= mdata->xfer_len;
} else {
mult_delta = mtk_spi_get_mult_delta(mdata->tx_sgl_len);
mdata->xfer_len = mdata->tx_sgl_len - mult_delta;
mdata->tx_sgl_len = mult_delta;
mdata->rx_sgl_len -= mdata->xfer_len;
}
} else if (mdata->tx_sgl_len) {
mult_delta = mtk_spi_get_mult_delta(mdata->tx_sgl_len);
mdata->xfer_len = mdata->tx_sgl_len - mult_delta;
mdata->tx_sgl_len = mult_delta;
} else if (mdata->rx_sgl_len) {
mult_delta = mtk_spi_get_mult_delta(mdata->rx_sgl_len);
mdata->xfer_len = mdata->rx_sgl_len - mult_delta;
mdata->rx_sgl_len = mult_delta;
}
}
static void mtk_spi_setup_dma_addr(struct spi_master *master,
struct spi_transfer *xfer)
{
struct mtk_spi *mdata = spi_master_get_devdata(master);
if (mdata->tx_sgl)
writel(xfer->tx_dma, mdata->base + SPI_TX_SRC_REG);
if (mdata->rx_sgl)
writel(xfer->rx_dma, mdata->base + SPI_RX_DST_REG);
}
static int mtk_spi_fifo_transfer(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *xfer)
{
int cnt;
struct mtk_spi *mdata = spi_master_get_devdata(master);
mdata->cur_transfer = xfer;
mdata->xfer_len = xfer->len;
mtk_spi_prepare_transfer(master, xfer);
mtk_spi_setup_packet(master);
if (xfer->len % 4)
cnt = xfer->len / 4 + 1;
else
cnt = xfer->len / 4;
iowrite32_rep(mdata->base + SPI_TX_DATA_REG, xfer->tx_buf, cnt);
mtk_spi_enable_transfer(master);
return 1;
}
static int mtk_spi_dma_transfer(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *xfer)
{
int cmd;
struct mtk_spi *mdata = spi_master_get_devdata(master);
mdata->tx_sgl = NULL;
mdata->rx_sgl = NULL;
mdata->tx_sgl_len = 0;
mdata->rx_sgl_len = 0;
mdata->cur_transfer = xfer;
mtk_spi_prepare_transfer(master, xfer);
cmd = readl(mdata->base + SPI_CMD_REG);
if (xfer->tx_buf)
cmd |= SPI_CMD_TX_DMA;
if (xfer->rx_buf)
cmd |= SPI_CMD_RX_DMA;
writel(cmd, mdata->base + SPI_CMD_REG);
if (xfer->tx_buf)
mdata->tx_sgl = xfer->tx_sg.sgl;
if (xfer->rx_buf)
mdata->rx_sgl = xfer->rx_sg.sgl;
if (mdata->tx_sgl) {
xfer->tx_dma = sg_dma_address(mdata->tx_sgl);
mdata->tx_sgl_len = sg_dma_len(mdata->tx_sgl);
}
if (mdata->rx_sgl) {
xfer->rx_dma = sg_dma_address(mdata->rx_sgl);
mdata->rx_sgl_len = sg_dma_len(mdata->rx_sgl);
}
mtk_spi_update_mdata_len(master);
mtk_spi_setup_packet(master);
mtk_spi_setup_dma_addr(master, xfer);
mtk_spi_enable_transfer(master);
return 1;
}
static int mtk_spi_transfer_one(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *xfer)
{
if (master->can_dma(master, spi, xfer))
return mtk_spi_dma_transfer(master, spi, xfer);
else
return mtk_spi_fifo_transfer(master, spi, xfer);
}
static bool mtk_spi_can_dma(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *xfer)
{
return xfer->len > MTK_SPI_MAX_FIFO_SIZE;
}
static irqreturn_t mtk_spi_interrupt(int irq, void *dev_id)
{
u32 cmd, reg_val, cnt;
struct spi_master *master = dev_id;
struct mtk_spi *mdata = spi_master_get_devdata(master);
struct spi_transfer *trans = mdata->cur_transfer;
reg_val = readl(mdata->base + SPI_STATUS0_REG);
if (reg_val & MTK_SPI_PAUSE_INT_STATUS)
mdata->state = MTK_SPI_PAUSED;
else
mdata->state = MTK_SPI_IDLE;
if (!master->can_dma(master, master->cur_msg->spi, trans)) {
if (trans->rx_buf) {
if (mdata->xfer_len % 4)
cnt = mdata->xfer_len / 4 + 1;
else
cnt = mdata->xfer_len / 4;
ioread32_rep(mdata->base + SPI_RX_DATA_REG,
trans->rx_buf, cnt);
}
spi_finalize_current_transfer(master);
return IRQ_HANDLED;
}
if (mdata->tx_sgl)
trans->tx_dma += mdata->xfer_len;
if (mdata->rx_sgl)
trans->rx_dma += mdata->xfer_len;
if (mdata->tx_sgl && (mdata->tx_sgl_len == 0)) {
mdata->tx_sgl = sg_next(mdata->tx_sgl);
if (mdata->tx_sgl) {
trans->tx_dma = sg_dma_address(mdata->tx_sgl);
mdata->tx_sgl_len = sg_dma_len(mdata->tx_sgl);
}
}
if (mdata->rx_sgl && (mdata->rx_sgl_len == 0)) {
mdata->rx_sgl = sg_next(mdata->rx_sgl);
if (mdata->rx_sgl) {
trans->rx_dma = sg_dma_address(mdata->rx_sgl);
mdata->rx_sgl_len = sg_dma_len(mdata->rx_sgl);
}
}
if (!mdata->tx_sgl && !mdata->rx_sgl) {
/* spi disable dma */
cmd = readl(mdata->base + SPI_CMD_REG);
cmd &= ~SPI_CMD_TX_DMA;
cmd &= ~SPI_CMD_RX_DMA;
writel(cmd, mdata->base + SPI_CMD_REG);
spi_finalize_current_transfer(master);
return IRQ_HANDLED;
}
mtk_spi_update_mdata_len(master);
mtk_spi_setup_packet(master);
mtk_spi_setup_dma_addr(master, trans);
mtk_spi_enable_transfer(master);
return IRQ_HANDLED;
}
static int mtk_spi_probe(struct platform_device *pdev)
{
struct spi_master *master;
struct mtk_spi *mdata;
const struct of_device_id *of_id;
struct resource *res;
int irq, ret;
master = spi_alloc_master(&pdev->dev, sizeof(*mdata));
if (!master) {
dev_err(&pdev->dev, "failed to alloc spi master\n");
return -ENOMEM;
}
master->auto_runtime_pm = true;
master->dev.of_node = pdev->dev.of_node;
master->mode_bits = SPI_CPOL | SPI_CPHA;
master->set_cs = mtk_spi_set_cs;
master->prepare_transfer_hardware = mtk_spi_prepare_hardware;
master->prepare_message = mtk_spi_prepare_message;
master->transfer_one = mtk_spi_transfer_one;
master->can_dma = mtk_spi_can_dma;
of_id = of_match_node(mtk_spi_of_match, pdev->dev.of_node);
if (!of_id) {
dev_err(&pdev->dev, "failed to probe of_node\n");
ret = -EINVAL;
goto err_put_master;
}
mdata = spi_master_get_devdata(master);
mdata->dev_comp = of_id->data;
if (mdata->dev_comp->must_tx)
master->flags = SPI_MASTER_MUST_TX;
if (mdata->dev_comp->need_pad_sel) {
ret = of_property_read_u32(pdev->dev.of_node,
"mediatek,pad-select",
&mdata->pad_sel);
if (ret) {
dev_err(&pdev->dev, "failed to read pad select: %d\n",
ret);
goto err_put_master;
}
if (mdata->pad_sel > MT8173_SPI_MAX_PAD_SEL) {
dev_err(&pdev->dev, "wrong pad-select: %u\n",
mdata->pad_sel);
ret = -EINVAL;
goto err_put_master;
}
}
platform_set_drvdata(pdev, master);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res) {
ret = -ENODEV;
dev_err(&pdev->dev, "failed to determine base address\n");
goto err_put_master;
}
mdata->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(mdata->base)) {
ret = PTR_ERR(mdata->base);
goto err_put_master;
}
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "failed to get irq (%d)\n", irq);
ret = irq;
goto err_put_master;
}
if (!pdev->dev.dma_mask)
pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
ret = devm_request_irq(&pdev->dev, irq, mtk_spi_interrupt,
IRQF_TRIGGER_NONE, dev_name(&pdev->dev), master);
if (ret) {
dev_err(&pdev->dev, "failed to register irq (%d)\n", ret);
goto err_put_master;
}
mdata->spi_clk = devm_clk_get(&pdev->dev, "spi-clk");
if (IS_ERR(mdata->spi_clk)) {
ret = PTR_ERR(mdata->spi_clk);
dev_err(&pdev->dev, "failed to get spi-clk: %d\n", ret);
goto err_put_master;
}
mdata->parent_clk = devm_clk_get(&pdev->dev, "parent-clk");
if (IS_ERR(mdata->parent_clk)) {
ret = PTR_ERR(mdata->parent_clk);
dev_err(&pdev->dev, "failed to get parent-clk: %d\n", ret);
goto err_put_master;
}
ret = clk_prepare_enable(mdata->spi_clk);
if (ret < 0) {
dev_err(&pdev->dev, "failed to enable spi_clk (%d)\n", ret);
goto err_put_master;
}
ret = clk_set_parent(mdata->spi_clk, mdata->parent_clk);
if (ret < 0) {
dev_err(&pdev->dev, "failed to clk_set_parent (%d)\n", ret);
goto err_disable_clk;
}
clk_disable_unprepare(mdata->spi_clk);
pm_runtime_enable(&pdev->dev);
ret = devm_spi_register_master(&pdev->dev, master);
if (ret) {
dev_err(&pdev->dev, "failed to register master (%d)\n", ret);
goto err_put_master;
}
return 0;
err_disable_clk:
clk_disable_unprepare(mdata->spi_clk);
err_put_master:
spi_master_put(master);
return ret;
}
static int mtk_spi_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
struct mtk_spi *mdata = spi_master_get_devdata(master);
pm_runtime_disable(&pdev->dev);
mtk_spi_reset(mdata);
clk_disable_unprepare(mdata->spi_clk);
spi_master_put(master);
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int mtk_spi_suspend(struct device *dev)
{
int ret;
struct spi_master *master = dev_get_drvdata(dev);
struct mtk_spi *mdata = spi_master_get_devdata(master);
ret = spi_master_suspend(master);
if (ret)
return ret;
if (!pm_runtime_suspended(dev))
clk_disable_unprepare(mdata->spi_clk);
return ret;
}
static int mtk_spi_resume(struct device *dev)
{
int ret;
struct spi_master *master = dev_get_drvdata(dev);
struct mtk_spi *mdata = spi_master_get_devdata(master);
if (!pm_runtime_suspended(dev)) {
ret = clk_prepare_enable(mdata->spi_clk);
if (ret < 0) {
dev_err(dev, "failed to enable spi_clk (%d)\n", ret);
return ret;
}
}
ret = spi_master_resume(master);
if (ret < 0)
clk_disable_unprepare(mdata->spi_clk);
return ret;
}
#endif /* CONFIG_PM_SLEEP */
#ifdef CONFIG_PM
static int mtk_spi_runtime_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct mtk_spi *mdata = spi_master_get_devdata(master);
clk_disable_unprepare(mdata->spi_clk);
return 0;
}
static int mtk_spi_runtime_resume(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct mtk_spi *mdata = spi_master_get_devdata(master);
int ret;
ret = clk_prepare_enable(mdata->spi_clk);
if (ret < 0) {
dev_err(dev, "failed to enable spi_clk (%d)\n", ret);
return ret;
}
return 0;
}
#endif /* CONFIG_PM */
static const struct dev_pm_ops mtk_spi_pm = {
SET_SYSTEM_SLEEP_PM_OPS(mtk_spi_suspend, mtk_spi_resume)
SET_RUNTIME_PM_OPS(mtk_spi_runtime_suspend,
mtk_spi_runtime_resume, NULL)
};
static struct platform_driver mtk_spi_driver = {
.driver = {
.name = "mtk-spi",
.pm = &mtk_spi_pm,
.of_match_table = mtk_spi_of_match,
},
.probe = mtk_spi_probe,
.remove = mtk_spi_remove,
};
module_platform_driver(mtk_spi_driver);
MODULE_DESCRIPTION("MTK SPI Controller driver");
MODULE_AUTHOR("Leilk Liu <leilk.liu@mediatek.com>");
MODULE_LICENSE("GPL v2");
MODULE_ALIAS("platform:mtk-spi");

10
drivers/spi/spi-omap2-mcspi.c
View File

@ -245,6 +245,7 @@ static void omap2_mcspi_set_enable(const struct spi_device *spi, int enable)
static void omap2_mcspi_set_cs(struct spi_device *spi, bool enable)
{
struct omap2_mcspi *mcspi = spi_master_get_devdata(spi->master);
u32 l;
/* The controller handles the inverted chip selects
@ -255,6 +256,12 @@ static void omap2_mcspi_set_cs(struct spi_device *spi, bool enable)
enable = !enable;
if (spi->controller_state) {
int err = pm_runtime_get_sync(mcspi->dev);
if (err < 0) {
dev_err(mcspi->dev, "failed to get sync: %d\n", err);
return;
}
l = mcspi_cached_chconf0(spi);
if (enable)
@ -263,6 +270,9 @@ static void omap2_mcspi_set_cs(struct spi_device *spi, bool enable)
l |= OMAP2_MCSPI_CHCONF_FORCE;
mcspi_write_chconf0(spi, l);
pm_runtime_mark_last_busy(mcspi->dev);
pm_runtime_put_autosuspend(mcspi->dev);
}
}

54
drivers/spi/spi-orion.c
View File

@ -41,6 +41,11 @@
#define ORION_SPI_DATA_OUT_REG 0x08
#define ORION_SPI_DATA_IN_REG 0x0c
#define ORION_SPI_INT_CAUSE_REG 0x10
#define ORION_SPI_TIMING_PARAMS_REG 0x18
#define ORION_SPI_TMISO_SAMPLE_MASK (0x3 << 6)
#define ORION_SPI_TMISO_SAMPLE_1 (1 << 6)
#define ORION_SPI_TMISO_SAMPLE_2 (2 << 6)
#define ORION_SPI_MODE_CPOL (1 << 11)
#define ORION_SPI_MODE_CPHA (1 << 12)
@ -70,6 +75,7 @@ struct orion_spi_dev {
unsigned int min_divisor;
unsigned int max_divisor;
u32 prescale_mask;
bool is_errata_50mhz_ac;
};
struct orion_spi {
@ -195,6 +201,41 @@ orion_spi_mode_set(struct spi_device *spi)
writel(reg, spi_reg(orion_spi, ORION_SPI_IF_CONFIG_REG));
}
static void
orion_spi_50mhz_ac_timing_erratum(struct spi_device *spi, unsigned int speed)
{
u32 reg;
struct orion_spi *orion_spi;
orion_spi = spi_master_get_devdata(spi->master);
/*
* Erratum description: (Erratum NO. FE-9144572) The device
* SPI interface supports frequencies of up to 50 MHz.
* However, due to this erratum, when the device core clock is
* 250 MHz and the SPI interfaces is configured for 50MHz SPI
* clock and CPOL=CPHA=1 there might occur data corruption on
* reads from the SPI device.
* Erratum Workaround:
* Work in one of the following configurations:
* 1. Set CPOL=CPHA=0 in "SPI Interface Configuration
* Register".
* 2. Set TMISO_SAMPLE value to 0x2 in "SPI Timing Parameters 1
* Register" before setting the interface.
*/
reg = readl(spi_reg(orion_spi, ORION_SPI_TIMING_PARAMS_REG));
reg &= ~ORION_SPI_TMISO_SAMPLE_MASK;
if (clk_get_rate(orion_spi->clk) == 250000000 &&
speed == 50000000 && spi->mode & SPI_CPOL &&
spi->mode & SPI_CPHA)
reg |= ORION_SPI_TMISO_SAMPLE_2;
else
reg |= ORION_SPI_TMISO_SAMPLE_1; /* This is the default value */
writel(reg, spi_reg(orion_spi, ORION_SPI_TIMING_PARAMS_REG));
}
/*
* called only when no transfer is active on the bus
*/
@ -216,6 +257,9 @@ orion_spi_setup_transfer(struct spi_device *spi, struct spi_transfer *t)
orion_spi_mode_set(spi);
if (orion_spi->devdata->is_errata_50mhz_ac)
orion_spi_50mhz_ac_timing_erratum(spi, speed);
rc = orion_spi_baudrate_set(spi, speed);
if (rc)
return rc;
@ -413,6 +457,14 @@ static const struct orion_spi_dev armada_375_spi_dev_data = {
.prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK,
};
static const struct orion_spi_dev armada_380_spi_dev_data = {
.typ = ARMADA_SPI,
.max_hz = 50000000,
.max_divisor = 1920,
.prescale_mask = ARMADA_SPI_CLK_PRESCALE_MASK,
.is_errata_50mhz_ac = true,
};
static const struct of_device_id orion_spi_of_match_table[] = {
{
.compatible = "marvell,orion-spi",
@ -428,7 +480,7 @@ static const struct of_device_id orion_spi_of_match_table[] = {
},
{
.compatible = "marvell,armada-380-spi",
.data = &armada_xp_spi_dev_data,
.data = &armada_380_spi_dev_data,
},
{
.compatible = "marvell,armada-390-spi",

1
drivers/spi/spi-pxa2xx-pci.c
View File

@ -7,7 +7,6 @@
#include <linux/of_device.h>
#include <linux/module.h>
#include <linux/spi/pxa2xx_spi.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/dmaengine.h>

66
drivers/spi/spi-pxa2xx.c
View File

@ -21,6 +21,7 @@
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/platform_device.h>
#include <linux/spi/pxa2xx_spi.h>
#include <linux/spi/spi.h>
@ -97,6 +98,15 @@ static const struct lpss_config lpss_platforms[] = {
.tx_threshold_lo = 160,
.tx_threshold_hi = 224,
},
{ /* LPSS_SPT_SSP */
.offset = 0x200,
.reg_general = -1,
.reg_ssp = 0x20,
.reg_cs_ctrl = 0x24,
.rx_threshold = 1,
.tx_threshold_lo = 32,
.tx_threshold_hi = 56,
},
};
static inline const struct lpss_config
@ -110,6 +120,7 @@ static bool is_lpss_ssp(const struct driver_data *drv_data)
switch (drv_data->ssp_type) {
case LPSS_LPT_SSP:
case LPSS_BYT_SSP:
case LPSS_SPT_SSP:
return true;
default:
return false;
@ -1107,6 +1118,7 @@ static int setup(struct spi_device *spi)
break;
case LPSS_LPT_SSP:
case LPSS_BYT_SSP:
case LPSS_SPT_SSP:
config = lpss_get_config(drv_data);
tx_thres = config->tx_threshold_lo;
tx_hi_thres = config->tx_threshold_hi;
@ -1276,6 +1288,31 @@ static const struct acpi_device_id pxa2xx_spi_acpi_match[] = {
};
MODULE_DEVICE_TABLE(acpi, pxa2xx_spi_acpi_match);
/*
* PCI IDs of compound devices that integrate both host controller and private
* integrated DMA engine. Please note these are not used in module
* autoloading and probing in this module but matching the LPSS SSP type.
*/
static const struct pci_device_id pxa2xx_spi_pci_compound_match[] = {
/* SPT-LP */
{ PCI_VDEVICE(INTEL, 0x9d29), LPSS_SPT_SSP },
{ PCI_VDEVICE(INTEL, 0x9d2a), LPSS_SPT_SSP },
/* SPT-H */
{ PCI_VDEVICE(INTEL, 0xa129), LPSS_SPT_SSP },
{ PCI_VDEVICE(INTEL, 0xa12a), LPSS_SPT_SSP },
{ },
};
static bool pxa2xx_spi_idma_filter(struct dma_chan *chan, void *param)
{
struct device *dev = param;
if (dev != chan->device->dev->parent)
return false;
return true;
}
static struct pxa2xx_spi_master *
pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
{
@ -1283,16 +1320,25 @@ pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
struct acpi_device *adev;
struct ssp_device *ssp;
struct resource *res;
const struct acpi_device_id *id;
const struct acpi_device_id *adev_id = NULL;
const struct pci_device_id *pcidev_id = NULL;
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;
if (dev_is_pci(pdev->dev.parent))
pcidev_id = pci_match_id(pxa2xx_spi_pci_compound_match,
to_pci_dev(pdev->dev.parent));
else
adev_id = acpi_match_device(pdev->dev.driver->acpi_match_table,
&pdev->dev);
if (adev_id)
type = (int)adev_id->driver_data;
else if (pcidev_id)
type = (int)pcidev_id->driver_data;
else
return NULL;
@ -1311,6 +1357,12 @@ pxa2xx_spi_acpi_get_pdata(struct platform_device *pdev)
if (IS_ERR(ssp->mmio_base))
return NULL;
if (pcidev_id) {
pdata->tx_param = pdev->dev.parent;
pdata->rx_param = pdev->dev.parent;
pdata->dma_filter = pxa2xx_spi_idma_filter;
}
ssp->clk = devm_clk_get(&pdev->dev, NULL);
ssp->irq = platform_get_irq(pdev, 0);
ssp->type = type;
@ -1362,8 +1414,7 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
return -ENODEV;
}
/* Allocate master with space for drv_data and null dma buffer */
master = spi_alloc_master(dev, sizeof(struct driver_data) + 16);
master = spi_alloc_master(dev, sizeof(struct driver_data));
if (!master) {
dev_err(&pdev->dev, "cannot alloc spi_master\n");
pxa_ssp_free(ssp);
@ -1390,7 +1441,6 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
master->auto_runtime_pm = true;
drv_data->ssp_type = ssp->type;
drv_data->null_dma_buf = (u32 *)PTR_ALIGN(&drv_data[1], DMA_ALIGNMENT);
drv_data->ioaddr = ssp->mmio_base;
drv_data->ssdr_physical = ssp->phys_base + SSDR;
@ -1424,8 +1474,6 @@ static int pxa2xx_spi_probe(struct platform_device *pdev)
}
/* Setup DMA if requested */
drv_data->tx_channel = -1;
drv_data->rx_channel = -1;
if (platform_info->enable_dma) {
status = pxa2xx_spi_dma_setup(drv_data);
if (status) {

5
drivers/spi/spi-pxa2xx.h
View File

@ -36,11 +36,6 @@ struct driver_data {
/* PXA hookup */
struct pxa2xx_spi_master *master_info;
/* PXA private DMA setup stuff */
int rx_channel;
int tx_channel;
u32 *null_dma_buf;
/* SSP register addresses */
void __iomem *ioaddr;
u32 ssdr_physical;

1
drivers/spi/spi-rockchip.c
View File

@ -645,7 +645,6 @@ static int rockchip_spi_probe(struct platform_device *pdev)
platform_set_drvdata(pdev, master);
rs = spi_master_get_devdata(master);
memset(rs, 0, sizeof(struct rockchip_spi));
/* Get basic io resource and map it */
mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);

19
drivers/spi/spi-rspi.c
View File

@ -383,7 +383,8 @@ static void qspi_update(const struct rspi_data *rspi, u8 mask, u8 val, u8 reg)
rspi_write8(rspi, data, reg);
}
static int qspi_set_send_trigger(struct rspi_data *rspi, unsigned int len)
static unsigned int qspi_set_send_trigger(struct rspi_data *rspi,
unsigned int len)
{
unsigned int n;
@ -724,25 +725,25 @@ static int rspi_rz_transfer_one(struct spi_master *master,
static int qspi_trigger_transfer_out_in(struct rspi_data *rspi, const u8 *tx,
u8 *rx, unsigned int len)
{
int i, n, ret;
int error;
unsigned int i, n;
int ret;
while (len > 0) {
n = qspi_set_send_trigger(rspi, len);
qspi_set_receive_trigger(rspi, len);
if (n == QSPI_BUFFER_SIZE) {
error = rspi_wait_for_tx_empty(rspi);
if (error < 0) {
ret = rspi_wait_for_tx_empty(rspi);
if (ret < 0) {
dev_err(&rspi->master->dev, "transmit timeout\n");
return error;
return ret;
}
for (i = 0; i < n; i++)
rspi_write_data(rspi, *tx++);
error = rspi_wait_for_rx_full(rspi);
if (error < 0) {
ret = rspi_wait_for_rx_full(rspi);
if (ret < 0) {
dev_err(&rspi->master->dev, "receive timeout\n");
return error;
return ret;
}
for (i = 0; i < n; i++)
*rx++ = rspi_read_data(rspi);

1
drivers/spi/spi-s3c24xx.c
View File

@ -501,7 +501,6 @@ static int s3c24xx_spi_probe(struct platform_device *pdev)
}
hw = spi_master_get_devdata(master);
memset(hw, 0, sizeof(struct s3c24xx_spi));
hw->master = master;
hw->pdata = pdata = dev_get_platdata(&pdev->dev);

4
drivers/spi/spi-s3c64xx.c
View File

@ -1191,8 +1191,8 @@ static int s3c64xx_spi_probe(struct platform_device *pdev)
dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d with %d Slaves attached\n",
sdd->port_id, master->num_chipselect);
dev_dbg(&pdev->dev, "\tIOmem=[%pR]\tDMA=[Rx-%d, Tx-%d]\n",
mem_res,
dev_dbg(&pdev->dev, "\tIOmem=[%pR]\tFIFO %dbytes\tDMA=[Rx-%d, Tx-%d]\n",
mem_res, (FIFO_LVL_MASK(sdd) >> 1) + 1,
sdd->rx_dma.dmach, sdd->tx_dma.dmach);
return 0;

20
drivers/spi/spi-sh-msiof.c
View File

@ -48,8 +48,8 @@ struct sh_msiof_spi_priv {
const struct sh_msiof_chipdata *chipdata;
struct sh_msiof_spi_info *info;
struct completion done;
int tx_fifo_size;
int rx_fifo_size;
unsigned int tx_fifo_size;
unsigned int rx_fifo_size;
void *tx_dma_page;
void *rx_dma_page;
dma_addr_t tx_dma_addr;
@ -95,8 +95,6 @@ struct sh_msiof_spi_priv {
#define MDR2_WDLEN1(i) (((i) - 1) << 16) /* Word Count (1-64/256 (SH, A1))) */
#define MDR2_GRPMASK1 0x00000001 /* Group Output Mask 1 (SH, A1) */
#define MAX_WDLEN 256U
/* TSCR and RSCR */
#define SCR_BRPS_MASK 0x1f00 /* Prescaler Setting (1-32) */
#define SCR_BRPS(i) (((i) - 1) << 8)
@ -850,7 +848,12 @@ static int sh_msiof_transfer_one(struct spi_master *master,
* DMA supports 32-bit words only, hence pack 8-bit and 16-bit
* words, with byte resp. word swapping.
*/
unsigned int l = min(len, MAX_WDLEN * 4);
unsigned int l = 0;
if (tx_buf)
l = min(len, p->tx_fifo_size * 4);
if (rx_buf)
l = min(len, p->rx_fifo_size * 4);
if (bits <= 8) {
if (l & 3)
@ -963,7 +966,7 @@ static const struct sh_msiof_chipdata sh_data = {
static const struct sh_msiof_chipdata r8a779x_data = {
.tx_fifo_size = 64,
.rx_fifo_size = 256,
.rx_fifo_size = 64,
.master_flags = SPI_MASTER_MUST_TX,
};
@ -1265,11 +1268,6 @@ static int sh_msiof_spi_remove(struct platform_device *pdev)
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 },
{ "spi_r8a7792_msiof", (kernel_ulong_t)&r8a779x_data },
{ "spi_r8a7793_msiof", (kernel_ulong_t)&r8a779x_data },
{ "spi_r8a7794_msiof", (kernel_ulong_t)&r8a779x_data },
{},
};
MODULE_DEVICE_TABLE(platform, spi_driver_ids);

34
drivers/spi/spi-ti-qspi.c
View File

@ -99,6 +99,8 @@ struct ti_qspi {
#define QSPI_INVAL (4 << 16)
#define QSPI_WC_CMD_INT_EN (1 << 14)
#define QSPI_FLEN(n) ((n - 1) << 0)
#define QSPI_WLEN_MAX_BITS 128
#define QSPI_WLEN_MAX_BYTES 16
/* STATUS REGISTER */
#define BUSY 0x01
@ -217,14 +219,16 @@ static inline u32 qspi_is_busy(struct ti_qspi *qspi)
static int qspi_write_msg(struct ti_qspi *qspi, struct spi_transfer *t)
{
int wlen, count;
int wlen, count, xfer_len;
unsigned int cmd;
const u8 *txbuf;
u32 data;
txbuf = t->tx_buf;
cmd = qspi->cmd | QSPI_WR_SNGL;
count = t->len;
wlen = t->bits_per_word >> 3; /* in bytes */
xfer_len = wlen;
while (count) {
if (qspi_is_busy(qspi))
@ -234,7 +238,29 @@ static int qspi_write_msg(struct ti_qspi *qspi, struct spi_transfer *t)
case 1:
dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %02x\n",
cmd, qspi->dc, *txbuf);
writeb(*txbuf, qspi->base + QSPI_SPI_DATA_REG);
if (count >= QSPI_WLEN_MAX_BYTES) {
u32 *txp = (u32 *)txbuf;
data = cpu_to_be32(*txp++);
writel(data, qspi->base +
QSPI_SPI_DATA_REG_3);
data = cpu_to_be32(*txp++);
writel(data, qspi->base +
QSPI_SPI_DATA_REG_2);
data = cpu_to_be32(*txp++);
writel(data, qspi->base +
QSPI_SPI_DATA_REG_1);
data = cpu_to_be32(*txp++);
writel(data, qspi->base +
QSPI_SPI_DATA_REG);
xfer_len = QSPI_WLEN_MAX_BYTES;
cmd |= QSPI_WLEN(QSPI_WLEN_MAX_BITS);
} else {
writeb(*txbuf, qspi->base + QSPI_SPI_DATA_REG);
cmd = qspi->cmd | QSPI_WR_SNGL;
xfer_len = wlen;
cmd |= QSPI_WLEN(wlen);
}
break;
case 2:
dev_dbg(qspi->dev, "tx cmd %08x dc %08x data %04x\n",
@ -254,8 +280,8 @@ static int qspi_write_msg(struct ti_qspi *qspi, struct spi_transfer *t)
dev_err(qspi->dev, "write timed out\n");
return -ETIMEDOUT;
}
txbuf += wlen;
count -= wlen;
txbuf += xfer_len;
count -= xfer_len;
}
return 0;

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

@ -237,11 +237,11 @@ static const struct i2c_device_id spi_xcomm_ids[] = {
{ "spi-xcomm" },
{ },
};
MODULE_DEVICE_TABLE(i2c, spi_xcomm_ids);
static struct i2c_driver spi_xcomm_driver = {
.driver = {
.name = "spi-xcomm",
.owner = THIS_MODULE,
},
.id_table = spi_xcomm_ids,
.probe = spi_xcomm_probe,

20
drivers/spi/spi-xilinx.c
View File

@ -249,19 +249,23 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
xspi->tx_ptr = t->tx_buf;
xspi->rx_ptr = t->rx_buf;
remaining_words = t->len / xspi->bytes_per_word;
reinit_completion(&xspi->done);
if (xspi->irq >= 0 && remaining_words > xspi->buffer_size) {
u32 isr;
use_irq = true;
xspi->write_fn(XSPI_INTR_TX_EMPTY,
xspi->regs + XIPIF_V123B_IISR_OFFSET);
/* Enable the global IPIF interrupt */
xspi->write_fn(XIPIF_V123B_GINTR_ENABLE,
xspi->regs + XIPIF_V123B_DGIER_OFFSET);
/* Inhibit irq to avoid spurious irqs on tx_empty*/
cr = xspi->read_fn(xspi->regs + XSPI_CR_OFFSET);
xspi->write_fn(cr | XSPI_CR_TRANS_INHIBIT,
xspi->regs + XSPI_CR_OFFSET);
/* ACK old irqs (if any) */
isr = xspi->read_fn(xspi->regs + XIPIF_V123B_IISR_OFFSET);
if (isr)
xspi->write_fn(isr,
xspi->regs + XIPIF_V123B_IISR_OFFSET);
/* Enable the global IPIF interrupt */
xspi->write_fn(XIPIF_V123B_GINTR_ENABLE,
xspi->regs + XIPIF_V123B_DGIER_OFFSET);
reinit_completion(&xspi->done);
}
while (remaining_words) {
@ -302,8 +306,10 @@ static int xilinx_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *t)
remaining_words -= n_words;
}
if (use_irq)
if (use_irq) {
xspi->write_fn(0, xspi->regs + XIPIF_V123B_DGIER_OFFSET);
xspi->write_fn(cr, xspi->regs + XSPI_CR_OFFSET);
}
return t->len;
}

456
drivers/spi/spi-xlp.c Normal file
View File

@ -0,0 +1,456 @@
/*
* Copyright (C) 2003-2015 Broadcom Corporation
* All Rights Reserved
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 (GPL v2)
* as published by the Free Software Foundation.
*
* 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/clk.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/spi/spi.h>
#include <linux/of.h>
#include <linux/interrupt.h>
/* SPI Configuration Register */
#define XLP_SPI_CONFIG 0x00
#define XLP_SPI_CPHA BIT(0)
#define XLP_SPI_CPOL BIT(1)
#define XLP_SPI_CS_POL BIT(2)
#define XLP_SPI_TXMISO_EN BIT(3)
#define XLP_SPI_TXMOSI_EN BIT(4)
#define XLP_SPI_RXMISO_EN BIT(5)
#define XLP_SPI_CS_LSBFE BIT(10)
#define XLP_SPI_RXCAP_EN BIT(11)
/* SPI Frequency Divider Register */
#define XLP_SPI_FDIV 0x04
/* SPI Command Register */
#define XLP_SPI_CMD 0x08
#define XLP_SPI_CMD_IDLE_MASK 0x0
#define XLP_SPI_CMD_TX_MASK 0x1
#define XLP_SPI_CMD_RX_MASK 0x2
#define XLP_SPI_CMD_TXRX_MASK 0x3
#define XLP_SPI_CMD_CONT BIT(4)
#define XLP_SPI_XFR_BITCNT_SHIFT 16
/* SPI Status Register */
#define XLP_SPI_STATUS 0x0c
#define XLP_SPI_XFR_PENDING BIT(0)
#define XLP_SPI_XFR_DONE BIT(1)
#define XLP_SPI_TX_INT BIT(2)
#define XLP_SPI_RX_INT BIT(3)
#define XLP_SPI_TX_UF BIT(4)
#define XLP_SPI_RX_OF BIT(5)
#define XLP_SPI_STAT_MASK 0x3f
/* SPI Interrupt Enable Register */
#define XLP_SPI_INTR_EN 0x10
#define XLP_SPI_INTR_DONE BIT(0)
#define XLP_SPI_INTR_TXTH BIT(1)
#define XLP_SPI_INTR_RXTH BIT(2)
#define XLP_SPI_INTR_TXUF BIT(3)
#define XLP_SPI_INTR_RXOF BIT(4)
/* SPI FIFO Threshold Register */
#define XLP_SPI_FIFO_THRESH 0x14
/* SPI FIFO Word Count Register */
#define XLP_SPI_FIFO_WCNT 0x18
#define XLP_SPI_RXFIFO_WCNT_MASK 0xf
#define XLP_SPI_TXFIFO_WCNT_MASK 0xf0
#define XLP_SPI_TXFIFO_WCNT_SHIFT 4
/* SPI Transmit Data FIFO Register */
#define XLP_SPI_TXDATA_FIFO 0x1c
/* SPI Receive Data FIFO Register */
#define XLP_SPI_RXDATA_FIFO 0x20
/* SPI System Control Register */
#define XLP_SPI_SYSCTRL 0x100
#define XLP_SPI_SYS_RESET BIT(0)
#define XLP_SPI_SYS_CLKDIS BIT(1)
#define XLP_SPI_SYS_PMEN BIT(8)
#define SPI_CS_OFFSET 0x40
#define XLP_SPI_TXRXTH 0x80
#define XLP_SPI_FIFO_SIZE 8
#define XLP_SPI_MAX_CS 4
#define XLP_SPI_DEFAULT_FREQ 133333333
#define XLP_SPI_FDIV_MIN 4
#define XLP_SPI_FDIV_MAX 65535
/*
* SPI can transfer only 28 bytes properly at a time. So split the
* transfer into 28 bytes size.
*/
#define XLP_SPI_XFER_SIZE 28
struct xlp_spi_priv {
struct device dev; /* device structure */
void __iomem *base; /* spi registers base address */
const u8 *tx_buf; /* tx data buffer */
u8 *rx_buf; /* rx data buffer */
int tx_len; /* tx xfer length */
int rx_len; /* rx xfer length */
int txerrors; /* TXFIFO underflow count */
int rxerrors; /* RXFIFO overflow count */
int cs; /* slave device chip select */
u32 spi_clk; /* spi clock frequency */
bool cmd_cont; /* cs active */
struct completion done; /* completion notification */
};
static inline u32 xlp_spi_reg_read(struct xlp_spi_priv *priv,
int cs, int regoff)
{
return readl(priv->base + regoff + cs * SPI_CS_OFFSET);
}
static inline void xlp_spi_reg_write(struct xlp_spi_priv *priv, int cs,
int regoff, u32 val)
{
writel(val, priv->base + regoff + cs * SPI_CS_OFFSET);
}
static inline void xlp_spi_sysctl_write(struct xlp_spi_priv *priv,
int regoff, u32 val)
{
writel(val, priv->base + regoff);
}
/*
* Setup global SPI_SYSCTRL register for all SPI channels.
*/
static void xlp_spi_sysctl_setup(struct xlp_spi_priv *xspi)
{
int cs;
for (cs = 0; cs < XLP_SPI_MAX_CS; cs++)
xlp_spi_sysctl_write(xspi, XLP_SPI_SYSCTRL,
XLP_SPI_SYS_RESET << cs);
xlp_spi_sysctl_write(xspi, XLP_SPI_SYSCTRL, XLP_SPI_SYS_PMEN);
}
static int xlp_spi_setup(struct spi_device *spi)
{
struct xlp_spi_priv *xspi;
u32 fdiv, cfg;
int cs;
xspi = spi_master_get_devdata(spi->master);
cs = spi->chip_select;
/*
* The value of fdiv must be between 4 and 65535.
*/
fdiv = DIV_ROUND_UP(xspi->spi_clk, spi->max_speed_hz);
if (fdiv > XLP_SPI_FDIV_MAX)
fdiv = XLP_SPI_FDIV_MAX;
else if (fdiv < XLP_SPI_FDIV_MIN)
fdiv = XLP_SPI_FDIV_MIN;
xlp_spi_reg_write(xspi, cs, XLP_SPI_FDIV, fdiv);
xlp_spi_reg_write(xspi, cs, XLP_SPI_FIFO_THRESH, XLP_SPI_TXRXTH);
cfg = xlp_spi_reg_read(xspi, cs, XLP_SPI_CONFIG);
if (spi->mode & SPI_CPHA)
cfg |= XLP_SPI_CPHA;
else
cfg &= ~XLP_SPI_CPHA;
if (spi->mode & SPI_CPOL)
cfg |= XLP_SPI_CPOL;
else
cfg &= ~XLP_SPI_CPOL;
if (!(spi->mode & SPI_CS_HIGH))
cfg |= XLP_SPI_CS_POL;
else
cfg &= ~XLP_SPI_CS_POL;
if (spi->mode & SPI_LSB_FIRST)
cfg |= XLP_SPI_CS_LSBFE;
else
cfg &= ~XLP_SPI_CS_LSBFE;
cfg |= XLP_SPI_TXMOSI_EN | XLP_SPI_RXMISO_EN;
if (fdiv == 4)
cfg |= XLP_SPI_RXCAP_EN;
xlp_spi_reg_write(xspi, cs, XLP_SPI_CONFIG, cfg);
return 0;
}
static void xlp_spi_read_rxfifo(struct xlp_spi_priv *xspi)
{
u32 rx_data, rxfifo_cnt;
int i, j, nbytes;
rxfifo_cnt = xlp_spi_reg_read(xspi, xspi->cs, XLP_SPI_FIFO_WCNT);
rxfifo_cnt &= XLP_SPI_RXFIFO_WCNT_MASK;
while (rxfifo_cnt) {
rx_data = xlp_spi_reg_read(xspi, xspi->cs, XLP_SPI_RXDATA_FIFO);
j = 0;
nbytes = min(xspi->rx_len, 4);
for (i = nbytes - 1; i >= 0; i--, j++)
xspi->rx_buf[i] = (rx_data >> (j * 8)) & 0xff;
xspi->rx_len -= nbytes;
xspi->rx_buf += nbytes;
rxfifo_cnt--;
}
}
static void xlp_spi_fill_txfifo(struct xlp_spi_priv *xspi)
{
u32 tx_data, txfifo_cnt;
int i, j, nbytes;
txfifo_cnt = xlp_spi_reg_read(xspi, xspi->cs, XLP_SPI_FIFO_WCNT);
txfifo_cnt &= XLP_SPI_TXFIFO_WCNT_MASK;
txfifo_cnt >>= XLP_SPI_TXFIFO_WCNT_SHIFT;
while (xspi->tx_len && (txfifo_cnt < XLP_SPI_FIFO_SIZE)) {
j = 0;
tx_data = 0;
nbytes = min(xspi->tx_len, 4);
for (i = nbytes - 1; i >= 0; i--, j++)
tx_data |= xspi->tx_buf[i] << (j * 8);
xlp_spi_reg_write(xspi, xspi->cs, XLP_SPI_TXDATA_FIFO, tx_data);
xspi->tx_len -= nbytes;
xspi->tx_buf += nbytes;
txfifo_cnt++;
}
}
static irqreturn_t xlp_spi_interrupt(int irq, void *dev_id)
{
struct xlp_spi_priv *xspi = dev_id;
u32 stat;
stat = xlp_spi_reg_read(xspi, xspi->cs, XLP_SPI_STATUS) &
XLP_SPI_STAT_MASK;
if (!stat)
return IRQ_NONE;
if (stat & XLP_SPI_TX_INT) {
if (xspi->tx_len)
xlp_spi_fill_txfifo(xspi);
if (stat & XLP_SPI_TX_UF)
xspi->txerrors++;
}
if (stat & XLP_SPI_RX_INT) {
if (xspi->rx_len)
xlp_spi_read_rxfifo(xspi);
if (stat & XLP_SPI_RX_OF)
xspi->rxerrors++;
}
/* write status back to clear interrupts */
xlp_spi_reg_write(xspi, xspi->cs, XLP_SPI_STATUS, stat);
if (stat & XLP_SPI_XFR_DONE)
complete(&xspi->done);
return IRQ_HANDLED;
}
static void xlp_spi_send_cmd(struct xlp_spi_priv *xspi, int xfer_len,
int cmd_cont)
{
u32 cmd = 0;
if (xspi->tx_buf)
cmd |= XLP_SPI_CMD_TX_MASK;
if (xspi->rx_buf)
cmd |= XLP_SPI_CMD_RX_MASK;
if (cmd_cont)
cmd |= XLP_SPI_CMD_CONT;
cmd |= ((xfer_len * 8 - 1) << XLP_SPI_XFR_BITCNT_SHIFT);
xlp_spi_reg_write(xspi, xspi->cs, XLP_SPI_CMD, cmd);
}
static int xlp_spi_xfer_block(struct xlp_spi_priv *xs,
const unsigned char *tx_buf,
unsigned char *rx_buf, int xfer_len, int cmd_cont)
{
int timeout;
u32 intr_mask = 0;
xs->tx_buf = tx_buf;
xs->rx_buf = rx_buf;
xs->tx_len = (xs->tx_buf == NULL) ? 0 : xfer_len;
xs->rx_len = (xs->rx_buf == NULL) ? 0 : xfer_len;
xs->txerrors = xs->rxerrors = 0;
/* fill TXDATA_FIFO, then send the CMD */
if (xs->tx_len)
xlp_spi_fill_txfifo(xs);
xlp_spi_send_cmd(xs, xfer_len, cmd_cont);
/*
* We are getting some spurious tx interrupts, so avoid enabling
* tx interrupts when only rx is in process.
* Enable all the interrupts in tx case.
*/
if (xs->tx_len)
intr_mask |= XLP_SPI_INTR_TXTH | XLP_SPI_INTR_TXUF |
XLP_SPI_INTR_RXTH | XLP_SPI_INTR_RXOF;
else
intr_mask |= XLP_SPI_INTR_RXTH | XLP_SPI_INTR_RXOF;
intr_mask |= XLP_SPI_INTR_DONE;
xlp_spi_reg_write(xs, xs->cs, XLP_SPI_INTR_EN, intr_mask);
timeout = wait_for_completion_timeout(&xs->done,
msecs_to_jiffies(1000));
/* Disable interrupts */
xlp_spi_reg_write(xs, xs->cs, XLP_SPI_INTR_EN, 0x0);
if (!timeout) {
dev_err(&xs->dev, "xfer timedout!\n");
goto out;
}
if (xs->txerrors || xs->rxerrors)
dev_err(&xs->dev, "Over/Underflow rx %d tx %d xfer %d!\n",
xs->rxerrors, xs->txerrors, xfer_len);
return xfer_len;
out:
return -ETIMEDOUT;
}
static int xlp_spi_txrx_bufs(struct xlp_spi_priv *xs, struct spi_transfer *t)
{
int bytesleft, sz;
unsigned char *rx_buf;
const unsigned char *tx_buf;
tx_buf = t->tx_buf;
rx_buf = t->rx_buf;
bytesleft = t->len;
while (bytesleft) {
if (bytesleft > XLP_SPI_XFER_SIZE)
sz = xlp_spi_xfer_block(xs, tx_buf, rx_buf,
XLP_SPI_XFER_SIZE, 1);
else
sz = xlp_spi_xfer_block(xs, tx_buf, rx_buf,
bytesleft, xs->cmd_cont);
if (sz < 0)
return sz;
bytesleft -= sz;
if (tx_buf)
tx_buf += sz;
if (rx_buf)
rx_buf += sz;
}
return bytesleft;
}
static int xlp_spi_transfer_one(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *t)
{
struct xlp_spi_priv *xspi = spi_master_get_devdata(master);
int ret = 0;
xspi->cs = spi->chip_select;
xspi->dev = spi->dev;
if (spi_transfer_is_last(master, t))
xspi->cmd_cont = 0;
else
xspi->cmd_cont = 1;
if (xlp_spi_txrx_bufs(xspi, t))
ret = -EIO;
spi_finalize_current_transfer(master);
return ret;
}
static int xlp_spi_probe(struct platform_device *pdev)
{
struct spi_master *master;
struct xlp_spi_priv *xspi;
struct resource *res;
struct clk *clk;
int irq, err;
xspi = devm_kzalloc(&pdev->dev, sizeof(*xspi), GFP_KERNEL);
if (!xspi)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
xspi->base = devm_ioremap_resource(&pdev->dev, res);
if (IS_ERR(xspi->base))
return PTR_ERR(xspi->base);
irq = platform_get_irq(pdev, 0);
if (irq < 0) {
dev_err(&pdev->dev, "no IRQ resource found\n");
return -EINVAL;
}
err = devm_request_irq(&pdev->dev, irq, xlp_spi_interrupt, 0,
pdev->name, xspi);
if (err) {
dev_err(&pdev->dev, "unable to request irq %d\n", irq);
return err;
}
clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(clk)) {
dev_err(&pdev->dev, "could not get spi clock\n");
return -ENODEV;
}
xspi->spi_clk = clk_get_rate(clk);
master = spi_alloc_master(&pdev->dev, 0);
if (!master) {
dev_err(&pdev->dev, "could not alloc master\n");
return -ENOMEM;
}
master->bus_num = 0;
master->num_chipselect = XLP_SPI_MAX_CS;
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH;
master->setup = xlp_spi_setup;
master->transfer_one = xlp_spi_transfer_one;
master->dev.of_node = pdev->dev.of_node;
init_completion(&xspi->done);
spi_master_set_devdata(master, xspi);
xlp_spi_sysctl_setup(xspi);
/* register spi controller */
err = devm_spi_register_master(&pdev->dev, master);
if (err) {
dev_err(&pdev->dev, "spi register master failed!\n");
spi_master_put(master);
return err;
}
return 0;
}
static const struct of_device_id xlp_spi_dt_id[] = {
{ .compatible = "netlogic,xlp832-spi" },
{ },
};
static struct platform_driver xlp_spi_driver = {
.probe = xlp_spi_probe,
.driver = {
.name = "xlp-spi",
.of_match_table = xlp_spi_dt_id,
},
};
module_platform_driver(xlp_spi_driver);
MODULE_AUTHOR("Kamlakant Patel <kamlakant.patel@broadcom.com>");
MODULE_DESCRIPTION("Netlogic XLP SPI controller driver");
MODULE_LICENSE("GPL v2");

235
drivers/spi/spi.c
View File

@ -67,11 +67,141 @@ modalias_show(struct device *dev, struct device_attribute *a, char *buf)
}
static DEVICE_ATTR_RO(modalias);
#define SPI_STATISTICS_ATTRS(field, file) \
static ssize_t spi_master_##field##_show(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
struct spi_master *master = container_of(dev, \
struct spi_master, dev); \
return spi_statistics_##field##_show(&master->statistics, buf); \
} \
static struct device_attribute dev_attr_spi_master_##field = { \
.attr = { .name = file, .mode = S_IRUGO }, \
.show = spi_master_##field##_show, \
}; \
static ssize_t spi_device_##field##_show(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
struct spi_device *spi = container_of(dev, \
struct spi_device, dev); \
return spi_statistics_##field##_show(&spi->statistics, buf); \
} \
static struct device_attribute dev_attr_spi_device_##field = { \
.attr = { .name = file, .mode = S_IRUGO }, \
.show = spi_device_##field##_show, \
}
#define SPI_STATISTICS_SHOW_NAME(name, file, field, format_string) \
static ssize_t spi_statistics_##name##_show(struct spi_statistics *stat, \
char *buf) \
{ \
unsigned long flags; \
ssize_t len; \
spin_lock_irqsave(&stat->lock, flags); \
len = sprintf(buf, format_string, stat->field); \
spin_unlock_irqrestore(&stat->lock, flags); \
return len; \
} \
SPI_STATISTICS_ATTRS(name, file)
#define SPI_STATISTICS_SHOW(field, format_string) \
SPI_STATISTICS_SHOW_NAME(field, __stringify(field), \
field, format_string)
SPI_STATISTICS_SHOW(messages, "%lu");
SPI_STATISTICS_SHOW(transfers, "%lu");
SPI_STATISTICS_SHOW(errors, "%lu");
SPI_STATISTICS_SHOW(timedout, "%lu");
SPI_STATISTICS_SHOW(spi_sync, "%lu");
SPI_STATISTICS_SHOW(spi_sync_immediate, "%lu");
SPI_STATISTICS_SHOW(spi_async, "%lu");
SPI_STATISTICS_SHOW(bytes, "%llu");
SPI_STATISTICS_SHOW(bytes_rx, "%llu");
SPI_STATISTICS_SHOW(bytes_tx, "%llu");
static struct attribute *spi_dev_attrs[] = {
&dev_attr_modalias.attr,
NULL,
};
ATTRIBUTE_GROUPS(spi_dev);
static const struct attribute_group spi_dev_group = {
.attrs = spi_dev_attrs,
};
static struct attribute *spi_device_statistics_attrs[] = {
&dev_attr_spi_device_messages.attr,
&dev_attr_spi_device_transfers.attr,
&dev_attr_spi_device_errors.attr,
&dev_attr_spi_device_timedout.attr,
&dev_attr_spi_device_spi_sync.attr,
&dev_attr_spi_device_spi_sync_immediate.attr,
&dev_attr_spi_device_spi_async.attr,
&dev_attr_spi_device_bytes.attr,
&dev_attr_spi_device_bytes_rx.attr,
&dev_attr_spi_device_bytes_tx.attr,
NULL,
};
static const struct attribute_group spi_device_statistics_group = {
.name = "statistics",
.attrs = spi_device_statistics_attrs,
};
static const struct attribute_group *spi_dev_groups[] = {
&spi_dev_group,
&spi_device_statistics_group,
NULL,
};
static struct attribute *spi_master_statistics_attrs[] = {
&dev_attr_spi_master_messages.attr,
&dev_attr_spi_master_transfers.attr,
&dev_attr_spi_master_errors.attr,
&dev_attr_spi_master_timedout.attr,
&dev_attr_spi_master_spi_sync.attr,
&dev_attr_spi_master_spi_sync_immediate.attr,
&dev_attr_spi_master_spi_async.attr,
&dev_attr_spi_master_bytes.attr,
&dev_attr_spi_master_bytes_rx.attr,
&dev_attr_spi_master_bytes_tx.attr,
NULL,
};
static const struct attribute_group spi_master_statistics_group = {
.name = "statistics",
.attrs = spi_master_statistics_attrs,
};
static const struct attribute_group *spi_master_groups[] = {
&spi_master_statistics_group,
NULL,
};
void spi_statistics_add_transfer_stats(struct spi_statistics *stats,
struct spi_transfer *xfer,
struct spi_master *master)
{
unsigned long flags;
spin_lock_irqsave(&stats->lock, flags);
stats->transfers++;
stats->bytes += xfer->len;
if ((xfer->tx_buf) &&
(xfer->tx_buf != master->dummy_tx))
stats->bytes_tx += xfer->len;
if ((xfer->rx_buf) &&
(xfer->rx_buf != master->dummy_rx))
stats->bytes_rx += xfer->len;
spin_unlock_irqrestore(&stats->lock, flags);
}
EXPORT_SYMBOL_GPL(spi_statistics_add_transfer_stats);
/* modalias support makes "modprobe $MODALIAS" new-style hotplug work,
* and the sysfs version makes coldplug work too.
@ -249,6 +379,9 @@ struct spi_device *spi_alloc_device(struct spi_master *master)
spi->dev.bus = &spi_bus_type;
spi->dev.release = spidev_release;
spi->cs_gpio = -ENOENT;
spin_lock_init(&spi->statistics.lock);
device_initialize(&spi->dev);
return spi;
}
@ -476,21 +609,30 @@ static int spi_map_buf(struct spi_master *master, struct device *dev,
enum dma_data_direction dir)
{
const bool vmalloced_buf = is_vmalloc_addr(buf);
const int desc_len = vmalloced_buf ? PAGE_SIZE : master->max_dma_len;
const int sgs = DIV_ROUND_UP(len, desc_len);
int desc_len;
int sgs;
struct page *vm_page;
void *sg_buf;
size_t min;
int i, ret;
if (vmalloced_buf) {
desc_len = PAGE_SIZE;
sgs = DIV_ROUND_UP(len + offset_in_page(buf), desc_len);
} else {
desc_len = master->max_dma_len;
sgs = DIV_ROUND_UP(len, desc_len);
}
ret = sg_alloc_table(sgt, sgs, GFP_KERNEL);
if (ret != 0)
return ret;
for (i = 0; i < sgs; i++) {
min = min_t(size_t, len, desc_len);
if (vmalloced_buf) {
min = min_t(size_t,
len, desc_len - offset_in_page(buf));
vm_page = vmalloc_to_page(buf);
if (!vm_page) {
sg_free_table(sgt);
@ -499,6 +641,7 @@ static int spi_map_buf(struct spi_master *master, struct device *dev,
sg_set_page(&sgt->sgl[i], vm_page,
min, offset_in_page(buf));
} else {
min = min_t(size_t, len, desc_len);
sg_buf = buf;
sg_set_buf(&sgt->sgl[i], sg_buf, min);
}
@ -539,8 +682,15 @@ static int __spi_map_msg(struct spi_master *master, struct spi_message *msg)
if (!master->can_dma)
return 0;
tx_dev = master->dma_tx->device->dev;
rx_dev = master->dma_rx->device->dev;
if (master->dma_tx)
tx_dev = master->dma_tx->device->dev;
else
tx_dev = &master->dev;
if (master->dma_rx)
rx_dev = master->dma_rx->device->dev;
else
rx_dev = &master->dev;
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
if (!master->can_dma(master, msg->spi, xfer))
@ -579,8 +729,15 @@ static int __spi_unmap_msg(struct spi_master *master, struct spi_message *msg)
if (!master->cur_msg_mapped || !master->can_dma)
return 0;
tx_dev = master->dma_tx->device->dev;
rx_dev = master->dma_rx->device->dev;
if (master->dma_tx)
tx_dev = master->dma_tx->device->dev;
else
tx_dev = &master->dev;
if (master->dma_rx)
rx_dev = master->dma_rx->device->dev;
else
rx_dev = &master->dev;
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
if (!master->can_dma(master, msg->spi, xfer))
@ -689,17 +846,29 @@ static int spi_transfer_one_message(struct spi_master *master,
bool keep_cs = false;
int ret = 0;
unsigned long ms = 1;
struct spi_statistics *statm = &master->statistics;
struct spi_statistics *stats = &msg->spi->statistics;
spi_set_cs(msg->spi, true);
SPI_STATISTICS_INCREMENT_FIELD(statm, messages);
SPI_STATISTICS_INCREMENT_FIELD(stats, messages);
list_for_each_entry(xfer, &msg->transfers, transfer_list) {
trace_spi_transfer_start(msg, xfer);
spi_statistics_add_transfer_stats(statm, xfer, master);
spi_statistics_add_transfer_stats(stats, xfer, master);
if (xfer->tx_buf || xfer->rx_buf) {
reinit_completion(&master->xfer_completion);
ret = master->transfer_one(master, msg->spi, xfer);
if (ret < 0) {
SPI_STATISTICS_INCREMENT_FIELD(statm,
errors);
SPI_STATISTICS_INCREMENT_FIELD(stats,
errors);
dev_err(&msg->spi->dev,
"SPI transfer failed: %d\n", ret);
goto out;
@ -715,6 +884,10 @@ static int spi_transfer_one_message(struct spi_master *master,
}
if (ms == 0) {
SPI_STATISTICS_INCREMENT_FIELD(statm,
timedout);
SPI_STATISTICS_INCREMENT_FIELD(stats,
timedout);
dev_err(&msg->spi->dev,
"SPI transfer timed out\n");
msg->status = -ETIMEDOUT;
@ -1416,10 +1589,10 @@ static struct class spi_master_class = {
.name = "spi_master",
.owner = THIS_MODULE,
.dev_release = spi_master_release,
.dev_groups = spi_master_groups,
};
/**
* spi_alloc_master - allocate SPI master controller
* @dev: the controller, possibly using the platform_bus
@ -1585,6 +1758,8 @@ int spi_register_master(struct spi_master *master)
goto done;
}
}
/* add statistics */
spin_lock_init(&master->statistics.lock);
mutex_lock(&board_lock);
list_add_tail(&master->list, &spi_master_list);
@ -1740,6 +1915,20 @@ EXPORT_SYMBOL_GPL(spi_busnum_to_master);
* other core methods are currently defined as inline functions.
*/
static int __spi_validate_bits_per_word(struct spi_master *master, u8 bits_per_word)
{
if (master->bits_per_word_mask) {
/* Only 32 bits fit in the mask */
if (bits_per_word > 32)
return -EINVAL;
if (!(master->bits_per_word_mask &
SPI_BPW_MASK(bits_per_word)))
return -EINVAL;
}
return 0;
}
/**
* spi_setup - setup SPI mode and clock rate
* @spi: the device whose settings are being modified
@ -1798,6 +1987,9 @@ int spi_setup(struct spi_device *spi)
if (!spi->bits_per_word)
spi->bits_per_word = 8;
if (__spi_validate_bits_per_word(spi->master, spi->bits_per_word))
return -EINVAL;
if (!spi->max_speed_hz)
spi->max_speed_hz = spi->master->max_speed_hz;
@ -1860,19 +2052,15 @@ static int __spi_validate(struct spi_device *spi, struct spi_message *message)
if (!xfer->speed_hz)
xfer->speed_hz = spi->max_speed_hz;
if (!xfer->speed_hz)
xfer->speed_hz = master->max_speed_hz;
if (master->max_speed_hz &&
xfer->speed_hz > master->max_speed_hz)
xfer->speed_hz = master->max_speed_hz;
if (master->bits_per_word_mask) {
/* Only 32 bits fit in the mask */
if (xfer->bits_per_word > 32)
return -EINVAL;
if (!(master->bits_per_word_mask &
BIT(xfer->bits_per_word - 1)))
return -EINVAL;
}
if (__spi_validate_bits_per_word(master, xfer->bits_per_word))
return -EINVAL;
/*
* SPI transfer length should be multiple of SPI word size
@ -1939,6 +2127,9 @@ static int __spi_async(struct spi_device *spi, struct spi_message *message)
message->spi = spi;
SPI_STATISTICS_INCREMENT_FIELD(&master->statistics, spi_async);
SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics, spi_async);
trace_spi_message_submit(message);
return master->transfer(spi, message);
@ -2075,6 +2266,9 @@ static int __spi_sync(struct spi_device *spi, struct spi_message *message,
message->context = &done;
message->spi = spi;
SPI_STATISTICS_INCREMENT_FIELD(&master->statistics, spi_sync);
SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics, spi_sync);
if (!bus_locked)
mutex_lock(&master->bus_lock_mutex);
@ -2102,8 +2296,13 @@ static int __spi_sync(struct spi_device *spi, struct spi_message *message,
/* Push out the messages in the calling context if we
* can.
*/
if (master->transfer == spi_queued_transfer)
if (master->transfer == spi_queued_transfer) {
SPI_STATISTICS_INCREMENT_FIELD(&master->statistics,
spi_sync_immediate);
SPI_STATISTICS_INCREMENT_FIELD(&spi->statistics,
spi_sync_immediate);
__spi_pump_messages(master, false);
}
wait_for_completion(&done);
status = message->status;

8
drivers/spi/spidev.c
View File

@ -602,11 +602,11 @@ static int spidev_open(struct inode *inode, struct file *filp)
if (!spidev->tx_buffer) {
spidev->tx_buffer = kmalloc(bufsiz, GFP_KERNEL);
if (!spidev->tx_buffer) {
dev_dbg(&spidev->spi->dev, "open/ENOMEM\n");
status = -ENOMEM;
dev_dbg(&spidev->spi->dev, "open/ENOMEM\n");
status = -ENOMEM;
goto err_find_dev;
}
}
}
if (!spidev->rx_buffer) {
spidev->rx_buffer = kmalloc(bufsiz, GFP_KERNEL);
@ -709,7 +709,7 @@ static int spidev_probe(struct spi_device *spi)
/*
* spidev should never be referenced in DT without a specific
* compatbile string, it is a Linux implementation thing
* compatible string, it is a Linux implementation thing
* rather than a description of the hardware.
*/
if (spi->dev.of_node && !of_match_device(spidev_dt_ids, &spi->dev)) {

1
include/linux/platform_data/spi-davinci.h
View File

@ -49,6 +49,7 @@ struct davinci_spi_platform_data {
u8 num_chipselect;
u8 intr_line;
u8 *chip_sel;
u8 prescaler_limit;
bool cshold_bug;
enum dma_event_q dma_event_q;
};

20
include/linux/platform_data/spi-mt65xx.h Normal file
View File

@ -0,0 +1,20 @@
/*
* MTK SPI bus driver definitions
*
* Copyright (c) 2015 MediaTek Inc.
* Author: Leilk Liu <leilk.liu@mediatek.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef ____LINUX_PLATFORM_DATA_SPI_MTK_H
#define ____LINUX_PLATFORM_DATA_SPI_MTK_H
/* Board specific platform_data */
struct mtk_chip_config {
u32 tx_mlsb;
u32 rx_mlsb;
};
#endif

1
include/linux/pxa2xx_ssp.h
View File

@ -197,6 +197,7 @@ enum pxa_ssp_type {
QUARK_X1000_SSP,
LPSS_LPT_SSP, /* Keep LPSS types sorted with lpss_platforms[] */
LPSS_BYT_SSP,
LPSS_SPT_SSP,
};
struct ssp_device {

64
include/linux/spi/spi.h
View File

@ -23,6 +23,8 @@
#include <linux/scatterlist.h>
struct dma_chan;
struct spi_master;
struct spi_transfer;
/*
* INTERFACES between SPI master-side drivers and SPI infrastructure.
@ -30,6 +32,59 @@ struct dma_chan;
*/
extern struct bus_type spi_bus_type;
/**
* struct spi_statistics - statistics for spi transfers
* @clock: lock protecting this structure
*
* @messages: number of spi-messages handled
* @transfers: number of spi_transfers handled
* @errors: number of errors during spi_transfer
* @timedout: number of timeouts during spi_transfer
*
* @spi_sync: number of times spi_sync is used
* @spi_sync_immediate:
* number of times spi_sync is executed immediately
* in calling context without queuing and scheduling
* @spi_async: number of times spi_async is used
*
* @bytes: number of bytes transferred to/from device
* @bytes_tx: number of bytes sent to device
* @bytes_rx: number of bytes received from device
*
*/
struct spi_statistics {
spinlock_t lock; /* lock for the whole structure */
unsigned long messages;
unsigned long transfers;
unsigned long errors;
unsigned long timedout;
unsigned long spi_sync;
unsigned long spi_sync_immediate;
unsigned long spi_async;
unsigned long long bytes;
unsigned long long bytes_rx;
unsigned long long bytes_tx;
};
void spi_statistics_add_transfer_stats(struct spi_statistics *stats,
struct spi_transfer *xfer,
struct spi_master *master);
#define SPI_STATISTICS_ADD_TO_FIELD(stats, field, count) \
do { \
unsigned long flags; \
spin_lock_irqsave(&(stats)->lock, flags); \
(stats)->field += count; \
spin_unlock_irqrestore(&(stats)->lock, flags); \
} while (0)
#define SPI_STATISTICS_INCREMENT_FIELD(stats, field) \
SPI_STATISTICS_ADD_TO_FIELD(stats, field, 1)
/**
* struct spi_device - Master side proxy for an SPI slave device
* @dev: Driver model representation of the device.
@ -60,6 +115,8 @@ extern struct bus_type spi_bus_type;
* @cs_gpio: gpio number of the chipselect line (optional, -ENOENT when
* when not using a GPIO line)
*
* @statistics: statistics for the spi_device
*
* A @spi_device is used to interchange data between an SPI slave
* (usually a discrete chip) and CPU memory.
*
@ -98,6 +155,9 @@ struct spi_device {
char modalias[SPI_NAME_SIZE];
int cs_gpio; /* chip select gpio */
/* the statistics */
struct spi_statistics statistics;
/*
* likely need more hooks for more protocol options affecting how
* the controller talks to each chip, like:
@ -296,6 +356,7 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv)
* @cs_gpios: Array of GPIOs to use as chip select lines; one per CS
* number. Any individual value may be -ENOENT for CS lines that
* are not GPIOs (driven by the SPI controller itself).
* @statistics: statistics for the spi_master
* @dma_tx: DMA transmit channel
* @dma_rx: DMA receive channel
* @dummy_rx: dummy receive buffer for full-duplex devices
@ -452,6 +513,9 @@ struct spi_master {
/* gpio chip select */
int *cs_gpios;
/* statistics */
struct spi_statistics statistics;
/* DMA channels for use with core dmaengine helpers */
struct dma_chan *dma_tx;
struct dma_chan *dma_rx;