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spi: Add Qualcomm QUP SPI controller support 

Qualcomm Universal Peripheral (QUP) core is an AHB slave that
provides a common data path (an output FIFO and an input FIFO)
for serial peripheral interface (SPI) mini-core. SPI in master
mode supports up to 50MHz, up to four chip selects, programmable
data path from 4 bits to 32 bits and numerous protocol variants.

Cc: Alok Chauhan <alokc@codeaurora.org>
Cc: Gilad Avidov <gavidov@codeaurora.org>
Cc: Kiran Gunda <kgunda@codeaurora.org>
Cc: Sagar Dharia <sdharia@codeaurora.org>
Cc: dsneddon@codeaurora.org
Signed-off-by: Ivan T. Ivanov <iivanov@mm-sol.com>
Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Ivan T. Ivanov 2014-02-13 18:21:38 +02:00 committed by Mark Brown
parent 1074600e79
commit 64ff247a97
3 changed files with 851 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/spi/Kconfig
View File

@ -381,6 +381,19 @@ config SPI_RSPI
help
SPI driver for Renesas RSPI blocks.
config SPI_QUP
tristate "Qualcomm SPI controller with QUP interface"
depends on ARCH_MSM_DT
help
Qualcomm Universal Peripheral (QUP) core is an AHB slave that
provides a common data path (an output FIFO and an input FIFO)
for serial peripheral interface (SPI) mini-core. SPI in master
mode supports up to 50MHz, up to four chip selects, programmable
data path from 4 bits to 32 bits and numerous protocol variants.
This driver can also be built as a module. If so, the module
will be called spi_qup.
config SPI_S3C24XX
tristate "Samsung S3C24XX series SPI"
depends on ARCH_S3C24XX

1
drivers/spi/Makefile
View File

@ -59,6 +59,7 @@ spi-pxa2xx-platform-$(CONFIG_SPI_PXA2XX_PXADMA) += spi-pxa2xx-pxadma.o
spi-pxa2xx-platform-$(CONFIG_SPI_PXA2XX_DMA) += spi-pxa2xx-dma.o
obj-$(CONFIG_SPI_PXA2XX) += spi-pxa2xx-platform.o
obj-$(CONFIG_SPI_PXA2XX_PCI) += spi-pxa2xx-pci.o
obj-$(CONFIG_SPI_QUP) += spi-qup.o
obj-$(CONFIG_SPI_RSPI) += spi-rspi.o
obj-$(CONFIG_SPI_S3C24XX) += spi-s3c24xx-hw.o
spi-s3c24xx-hw-y := spi-s3c24xx.o

837
drivers/spi/spi-qup.c Normal file
View File

@ -0,0 +1,837 @@
/*
* Copyright (c) 2008-2014, The Linux foundation. 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 rev 2 and
* only rev 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/delay.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/io.h>
#include <linux/list.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/spi/spi.h>
#define QUP_CONFIG 0x0000
#define QUP_STATE 0x0004
#define QUP_IO_M_MODES 0x0008
#define QUP_SW_RESET 0x000c
#define QUP_OPERATIONAL 0x0018
#define QUP_ERROR_FLAGS 0x001c
#define QUP_ERROR_FLAGS_EN 0x0020
#define QUP_OPERATIONAL_MASK 0x0028
#define QUP_HW_VERSION 0x0030
#define QUP_MX_OUTPUT_CNT 0x0100
#define QUP_OUTPUT_FIFO 0x0110
#define QUP_MX_WRITE_CNT 0x0150
#define QUP_MX_INPUT_CNT 0x0200
#define QUP_MX_READ_CNT 0x0208
#define QUP_INPUT_FIFO 0x0218
#define SPI_CONFIG 0x0300
#define SPI_IO_CONTROL 0x0304
#define SPI_ERROR_FLAGS 0x0308
#define SPI_ERROR_FLAGS_EN 0x030c
/* QUP_CONFIG fields */
#define QUP_CONFIG_SPI_MODE (1 << 8)
#define QUP_CONFIG_CLOCK_AUTO_GATE BIT(13)
#define QUP_CONFIG_NO_INPUT BIT(7)
#define QUP_CONFIG_NO_OUTPUT BIT(6)
#define QUP_CONFIG_N 0x001f
/* QUP_STATE fields */
#define QUP_STATE_VALID BIT(2)
#define QUP_STATE_RESET 0
#define QUP_STATE_RUN 1
#define QUP_STATE_PAUSE 3
#define QUP_STATE_MASK 3
#define QUP_STATE_CLEAR 2
#define QUP_HW_VERSION_2_1_1 0x20010001
/* QUP_IO_M_MODES fields */
#define QUP_IO_M_PACK_EN BIT(15)
#define QUP_IO_M_UNPACK_EN BIT(14)
#define QUP_IO_M_INPUT_MODE_MASK_SHIFT 12
#define QUP_IO_M_OUTPUT_MODE_MASK_SHIFT 10
#define QUP_IO_M_INPUT_MODE_MASK (3 << QUP_IO_M_INPUT_MODE_MASK_SHIFT)
#define QUP_IO_M_OUTPUT_MODE_MASK (3 << QUP_IO_M_OUTPUT_MODE_MASK_SHIFT)
#define QUP_IO_M_OUTPUT_BLOCK_SIZE(x) (((x) & (0x03 << 0)) >> 0)
#define QUP_IO_M_OUTPUT_FIFO_SIZE(x) (((x) & (0x07 << 2)) >> 2)
#define QUP_IO_M_INPUT_BLOCK_SIZE(x) (((x) & (0x03 << 5)) >> 5)
#define QUP_IO_M_INPUT_FIFO_SIZE(x) (((x) & (0x07 << 7)) >> 7)
#define QUP_IO_M_MODE_FIFO 0
#define QUP_IO_M_MODE_BLOCK 1
#define QUP_IO_M_MODE_DMOV 2
#define QUP_IO_M_MODE_BAM 3
/* QUP_OPERATIONAL fields */
#define QUP_OP_MAX_INPUT_DONE_FLAG BIT(11)
#define QUP_OP_MAX_OUTPUT_DONE_FLAG BIT(10)
#define QUP_OP_IN_SERVICE_FLAG BIT(9)
#define QUP_OP_OUT_SERVICE_FLAG BIT(8)
#define QUP_OP_IN_FIFO_FULL BIT(7)
#define QUP_OP_OUT_FIFO_FULL BIT(6)
#define QUP_OP_IN_FIFO_NOT_EMPTY BIT(5)
#define QUP_OP_OUT_FIFO_NOT_EMPTY BIT(4)
/* QUP_ERROR_FLAGS and QUP_ERROR_FLAGS_EN fields */
#define QUP_ERROR_OUTPUT_OVER_RUN BIT(5)
#define QUP_ERROR_INPUT_UNDER_RUN BIT(4)
#define QUP_ERROR_OUTPUT_UNDER_RUN BIT(3)
#define QUP_ERROR_INPUT_OVER_RUN BIT(2)
/* SPI_CONFIG fields */
#define SPI_CONFIG_HS_MODE BIT(10)
#define SPI_CONFIG_INPUT_FIRST BIT(9)
#define SPI_CONFIG_LOOPBACK BIT(8)
/* SPI_IO_CONTROL fields */
#define SPI_IO_C_FORCE_CS BIT(11)
#define SPI_IO_C_CLK_IDLE_HIGH BIT(10)
#define SPI_IO_C_MX_CS_MODE BIT(8)
#define SPI_IO_C_CS_N_POLARITY_0 BIT(4)
#define SPI_IO_C_CS_SELECT(x) (((x) & 3) << 2)
#define SPI_IO_C_CS_SELECT_MASK 0x000c
#define SPI_IO_C_TRISTATE_CS BIT(1)
#define SPI_IO_C_NO_TRI_STATE BIT(0)
/* SPI_ERROR_FLAGS and SPI_ERROR_FLAGS_EN fields */
#define SPI_ERROR_CLK_OVER_RUN BIT(1)
#define SPI_ERROR_CLK_UNDER_RUN BIT(0)
#define SPI_NUM_CHIPSELECTS 4
/* high speed mode is when bus rate is greater then 26MHz */
#define SPI_HS_MIN_RATE 26000000
#define SPI_MAX_RATE 50000000
#define SPI_DELAY_THRESHOLD 1
#define SPI_DELAY_RETRY 10
struct spi_qup_device {
int select;
u16 mode;
};
struct spi_qup {
void __iomem *base;
struct device *dev;
struct clk *cclk; /* core clock */
struct clk *iclk; /* interface clock */
int irq;
u32 max_speed_hz;
spinlock_t lock;
int in_fifo_sz;
int out_fifo_sz;
int in_blk_sz;
int out_blk_sz;
struct spi_transfer *xfer;
struct completion done;
int error;
int w_size; /* bytes per SPI word */
int tx_bytes;
int rx_bytes;
};
static inline bool spi_qup_is_valid_state(struct spi_qup *controller)
{
u32 opstate = readl_relaxed(controller->base + QUP_STATE);
return opstate & QUP_STATE_VALID;
}
static int spi_qup_set_state(struct spi_qup *controller, u32 state)
{
unsigned long loop;
u32 cur_state;
loop = 0;
while (!spi_qup_is_valid_state(controller)) {
usleep_range(SPI_DELAY_THRESHOLD, SPI_DELAY_THRESHOLD * 2);
if (++loop > SPI_DELAY_RETRY)
return -EIO;
}
if (loop)
dev_dbg(controller->dev, "invalid state for %ld,us %d\n",
loop, state);
cur_state = readl_relaxed(controller->base + QUP_STATE);
/*
* Per spec: for PAUSE_STATE to RESET_STATE, two writes
* of (b10) are required
*/
if (((cur_state & QUP_STATE_MASK) == QUP_STATE_PAUSE) &&
(state == QUP_STATE_RESET)) {
writel_relaxed(QUP_STATE_CLEAR, controller->base + QUP_STATE);
writel_relaxed(QUP_STATE_CLEAR, controller->base + QUP_STATE);
} else {
cur_state &= ~QUP_STATE_MASK;
cur_state |= state;
writel_relaxed(cur_state, controller->base + QUP_STATE);
}
loop = 0;
while (!spi_qup_is_valid_state(controller)) {
usleep_range(SPI_DELAY_THRESHOLD, SPI_DELAY_THRESHOLD * 2);
if (++loop > SPI_DELAY_RETRY)
return -EIO;
}
return 0;
}
static void spi_qup_fifo_read(struct spi_qup *controller,
struct spi_transfer *xfer)
{
u8 *rx_buf = xfer->rx_buf;
u32 word, state;
int idx, shift, w_size;
w_size = controller->w_size;
while (controller->rx_bytes < xfer->len) {
state = readl_relaxed(controller->base + QUP_OPERATIONAL);
if (0 == (state & QUP_OP_IN_FIFO_NOT_EMPTY))
break;
word = readl_relaxed(controller->base + QUP_INPUT_FIFO);
if (!rx_buf) {
controller->rx_bytes += w_size;
continue;
}
for (idx = 0; idx < w_size; idx++, controller->rx_bytes++) {
/*
* The data format depends on bytes per SPI word:
* 4 bytes: 0x12345678
* 2 bytes: 0x00001234
* 1 byte : 0x00000012
*/
shift = BITS_PER_BYTE;
shift *= (w_size - idx - 1);
rx_buf[controller->rx_bytes] = word >> shift;
}
}
}
static void spi_qup_fifo_write(struct spi_qup *controller,
struct spi_transfer *xfer)
{
const u8 *tx_buf = xfer->tx_buf;
u32 word, state, data;
int idx, w_size;
w_size = controller->w_size;
while (controller->tx_bytes < xfer->len) {
state = readl_relaxed(controller->base + QUP_OPERATIONAL);
if (state & QUP_OP_OUT_FIFO_FULL)
break;
word = 0;
for (idx = 0; idx < w_size; idx++, controller->tx_bytes++) {
if (!tx_buf) {
controller->tx_bytes += w_size;
break;
}
data = tx_buf[controller->tx_bytes];
word |= data << (BITS_PER_BYTE * (3 - idx));
}
writel_relaxed(word, controller->base + QUP_OUTPUT_FIFO);
}
}
static irqreturn_t spi_qup_qup_irq(int irq, void *dev_id)
{
struct spi_qup *controller = dev_id;
struct spi_transfer *xfer;
u32 opflags, qup_err, spi_err;
unsigned long flags;
int error = 0;
spin_lock_irqsave(&controller->lock, flags);
xfer = controller->xfer;
controller->xfer = NULL;
spin_unlock_irqrestore(&controller->lock, flags);
qup_err = readl_relaxed(controller->base + QUP_ERROR_FLAGS);
spi_err = readl_relaxed(controller->base + SPI_ERROR_FLAGS);
opflags = readl_relaxed(controller->base + QUP_OPERATIONAL);
writel_relaxed(qup_err, controller->base + QUP_ERROR_FLAGS);
writel_relaxed(spi_err, controller->base + SPI_ERROR_FLAGS);
writel_relaxed(opflags, controller->base + QUP_OPERATIONAL);
if (!xfer) {
dev_err_ratelimited(controller->dev, "unexpected irq %x08 %x08 %x08\n",
qup_err, spi_err, opflags);
return IRQ_HANDLED;
}
if (qup_err) {
if (qup_err & QUP_ERROR_OUTPUT_OVER_RUN)
dev_warn(controller->dev, "OUTPUT_OVER_RUN\n");
if (qup_err & QUP_ERROR_INPUT_UNDER_RUN)
dev_warn(controller->dev, "INPUT_UNDER_RUN\n");
if (qup_err & QUP_ERROR_OUTPUT_UNDER_RUN)
dev_warn(controller->dev, "OUTPUT_UNDER_RUN\n");
if (qup_err & QUP_ERROR_INPUT_OVER_RUN)
dev_warn(controller->dev, "INPUT_OVER_RUN\n");
error = -EIO;
}
if (spi_err) {
if (spi_err & SPI_ERROR_CLK_OVER_RUN)
dev_warn(controller->dev, "CLK_OVER_RUN\n");
if (spi_err & SPI_ERROR_CLK_UNDER_RUN)
dev_warn(controller->dev, "CLK_UNDER_RUN\n");
error = -EIO;
}
if (opflags & QUP_OP_IN_SERVICE_FLAG)
spi_qup_fifo_read(controller, xfer);
if (opflags & QUP_OP_OUT_SERVICE_FLAG)
spi_qup_fifo_write(controller, xfer);
spin_lock_irqsave(&controller->lock, flags);
controller->error = error;
controller->xfer = xfer;
spin_unlock_irqrestore(&controller->lock, flags);
if (controller->rx_bytes == xfer->len || error)
complete(&controller->done);
return IRQ_HANDLED;
}
/* set clock freq ... bits per word */
static int spi_qup_io_config(struct spi_qup *controller,
struct spi_qup_device *chip,
struct spi_transfer *xfer)
{
u32 config, iomode, mode;
int ret, n_words, w_size;
if (chip->mode & SPI_LOOP && xfer->len > controller->in_fifo_sz) {
dev_err(controller->dev, "too big size for loopback %d > %d\n",
xfer->len, controller->in_fifo_sz);
return -EIO;
}
ret = clk_set_rate(controller->cclk, xfer->speed_hz);
if (ret) {
dev_err(controller->dev, "fail to set frequency %d",
xfer->speed_hz);
return -EIO;
}
if (spi_qup_set_state(controller, QUP_STATE_RESET)) {
dev_err(controller->dev, "cannot set RESET state\n");
return -EIO;
}
w_size = 4;
if (xfer->bits_per_word <= 8)
w_size = 1;
else if (xfer->bits_per_word <= 16)
w_size = 2;
n_words = xfer->len / w_size;
controller->w_size = w_size;
if (n_words <= controller->in_fifo_sz) {
mode = QUP_IO_M_MODE_FIFO;
writel_relaxed(n_words, controller->base + QUP_MX_READ_CNT);
writel_relaxed(n_words, controller->base + QUP_MX_WRITE_CNT);
/* must be zero for FIFO */
writel_relaxed(0, controller->base + QUP_MX_INPUT_CNT);
writel_relaxed(0, controller->base + QUP_MX_OUTPUT_CNT);
} else {
mode = QUP_IO_M_MODE_BLOCK;
writel_relaxed(n_words, controller->base + QUP_MX_INPUT_CNT);
writel_relaxed(n_words, controller->base + QUP_MX_OUTPUT_CNT);
/* must be zero for BLOCK and BAM */
writel_relaxed(0, controller->base + QUP_MX_READ_CNT);
writel_relaxed(0, controller->base + QUP_MX_WRITE_CNT);
}
iomode = readl_relaxed(controller->base + QUP_IO_M_MODES);
/* Set input and output transfer mode */
iomode &= ~(QUP_IO_M_INPUT_MODE_MASK | QUP_IO_M_OUTPUT_MODE_MASK);
iomode &= ~(QUP_IO_M_PACK_EN | QUP_IO_M_UNPACK_EN);
iomode |= (mode << QUP_IO_M_OUTPUT_MODE_MASK_SHIFT);
iomode |= (mode << QUP_IO_M_INPUT_MODE_MASK_SHIFT);
writel_relaxed(iomode, controller->base + QUP_IO_M_MODES);
config = readl_relaxed(controller->base + SPI_CONFIG);
if (chip->mode & SPI_LOOP)
config |= SPI_CONFIG_LOOPBACK;
else
config &= ~SPI_CONFIG_LOOPBACK;
if (chip->mode & SPI_CPHA)
config &= ~SPI_CONFIG_INPUT_FIRST;
else
config |= SPI_CONFIG_INPUT_FIRST;
/*
* HS_MODE improves signal stability for spi-clk high rates,
* but is invalid in loop back mode.
*/
if ((xfer->speed_hz >= SPI_HS_MIN_RATE) && !(chip->mode & SPI_LOOP))
config |= SPI_CONFIG_HS_MODE;
else
config &= ~SPI_CONFIG_HS_MODE;
writel_relaxed(config, controller->base + SPI_CONFIG);
config = readl_relaxed(controller->base + QUP_CONFIG);
config &= ~(QUP_CONFIG_NO_INPUT | QUP_CONFIG_NO_OUTPUT | QUP_CONFIG_N);
config |= xfer->bits_per_word - 1;
config |= QUP_CONFIG_SPI_MODE;
writel_relaxed(config, controller->base + QUP_CONFIG);
writel_relaxed(0, controller->base + QUP_OPERATIONAL_MASK);
return 0;
}
static void spi_qup_set_cs(struct spi_device *spi, bool enable)
{
struct spi_qup *controller = spi_master_get_devdata(spi->master);
struct spi_qup_device *chip = spi_get_ctldata(spi);
u32 iocontol, mask;
iocontol = readl_relaxed(controller->base + SPI_IO_CONTROL);
/* Disable auto CS toggle and use manual */
iocontol &= ~SPI_IO_C_MX_CS_MODE;
iocontol |= SPI_IO_C_FORCE_CS;
iocontol &= ~SPI_IO_C_CS_SELECT_MASK;
iocontol |= SPI_IO_C_CS_SELECT(chip->select);
mask = SPI_IO_C_CS_N_POLARITY_0 << chip->select;
if (enable)
iocontol |= mask;
else
iocontol &= ~mask;
writel_relaxed(iocontol, controller->base + SPI_IO_CONTROL);
}
static int spi_qup_transfer_one(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *xfer)
{
struct spi_qup *controller = spi_master_get_devdata(master);
struct spi_qup_device *chip = spi_get_ctldata(spi);
unsigned long timeout, flags;
int ret = -EIO;
ret = spi_qup_io_config(controller, chip, xfer);
if (ret)
return ret;
timeout = DIV_ROUND_UP(xfer->speed_hz, MSEC_PER_SEC);
timeout = DIV_ROUND_UP(xfer->len * 8, timeout);
timeout = 100 * msecs_to_jiffies(timeout);
reinit_completion(&controller->done);
spin_lock_irqsave(&controller->lock, flags);
controller->xfer = xfer;
controller->error = 0;
controller->rx_bytes = 0;
controller->tx_bytes = 0;
spin_unlock_irqrestore(&controller->lock, flags);
if (spi_qup_set_state(controller, QUP_STATE_RUN)) {
dev_warn(controller->dev, "cannot set RUN state\n");
goto exit;
}
if (spi_qup_set_state(controller, QUP_STATE_PAUSE)) {
dev_warn(controller->dev, "cannot set PAUSE state\n");
goto exit;
}
spi_qup_fifo_write(controller, xfer);
if (spi_qup_set_state(controller, QUP_STATE_RUN)) {
dev_warn(controller->dev, "cannot set EXECUTE state\n");
goto exit;
}
if (!wait_for_completion_timeout(&controller->done, timeout))
ret = -ETIMEDOUT;
exit:
spi_qup_set_state(controller, QUP_STATE_RESET);
spin_lock_irqsave(&controller->lock, flags);
controller->xfer = NULL;
if (!ret)
ret = controller->error;
spin_unlock_irqrestore(&controller->lock, flags);
return ret;
}
static int spi_qup_setup(struct spi_device *spi)
{
struct spi_qup *controller = spi_master_get_devdata(spi->master);
struct spi_qup_device *chip = spi_get_ctldata(spi);
if (spi->chip_select >= spi->master->num_chipselect) {
dev_err(controller->dev, "invalid chip_select %d\n",
spi->chip_select);
return -EINVAL;
}
if (spi->max_speed_hz > controller->max_speed_hz) {
dev_err(controller->dev, "invalid max_speed_hz %d\n",
spi->max_speed_hz);
return -EINVAL;
}
if (!chip) {
/* First setup */
chip = kzalloc(sizeof(*chip), GFP_KERNEL);
if (!chip) {
dev_err(controller->dev, "no memory for chip data\n");
return -ENOMEM;
}
chip->mode = spi->mode;
chip->select = spi->chip_select;
spi_set_ctldata(spi, chip);
}
return 0;
}
static void spi_qup_cleanup(struct spi_device *spi)
{
struct spi_qup_device *chip = spi_get_ctldata(spi);
if (!chip)
return;
spi_set_ctldata(spi, NULL);
kfree(chip);
}
static int spi_qup_probe(struct platform_device *pdev)
{
struct spi_master *master;
struct clk *iclk, *cclk;
struct spi_qup *controller;
struct resource *res;
struct device *dev;
void __iomem *base;
u32 data, max_freq, iomode;
int ret, irq, size;
dev = &pdev->dev;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
base = devm_ioremap_resource(dev, res);
if (IS_ERR(base))
return PTR_ERR(base);
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
cclk = devm_clk_get(dev, "core");
if (IS_ERR(cclk))
return PTR_ERR(cclk);
iclk = devm_clk_get(dev, "iface");
if (IS_ERR(iclk))
return PTR_ERR(iclk);
/* This is optional parameter */
if (of_property_read_u32(dev->of_node, "spi-max-frequency", &max_freq))
max_freq = SPI_MAX_RATE;
if (!max_freq || max_freq > SPI_MAX_RATE) {
dev_err(dev, "invalid clock frequency %d\n", max_freq);
return -ENXIO;
}
ret = clk_prepare_enable(cclk);
if (ret) {
dev_err(dev, "cannot enable core clock\n");
return ret;
}
ret = clk_prepare_enable(iclk);
if (ret) {
clk_disable_unprepare(cclk);
dev_err(dev, "cannot enable iface clock\n");
return ret;
}
data = readl_relaxed(base + QUP_HW_VERSION);
if (data < QUP_HW_VERSION_2_1_1) {
clk_disable_unprepare(cclk);
clk_disable_unprepare(iclk);
dev_err(dev, "v.%08x is not supported\n", data);
return -ENXIO;
}
master = spi_alloc_master(dev, sizeof(struct spi_qup));
if (!master) {
clk_disable_unprepare(cclk);
clk_disable_unprepare(iclk);
dev_err(dev, "cannot allocate master\n");
return -ENOMEM;
}
master->bus_num = pdev->id;
master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH | SPI_LOOP;
master->num_chipselect = SPI_NUM_CHIPSELECTS;
master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 32);
master->setup = spi_qup_setup;
master->cleanup = spi_qup_cleanup;
master->set_cs = spi_qup_set_cs;
master->transfer_one = spi_qup_transfer_one;
master->dev.of_node = pdev->dev.of_node;
master->auto_runtime_pm = true;
platform_set_drvdata(pdev, master);
controller = spi_master_get_devdata(master);
controller->dev = dev;
controller->base = base;
controller->iclk = iclk;
controller->cclk = cclk;
controller->irq = irq;
controller->max_speed_hz = max_freq;
spin_lock_init(&controller->lock);
init_completion(&controller->done);
iomode = readl_relaxed(base + QUP_IO_M_MODES);
size = QUP_IO_M_OUTPUT_BLOCK_SIZE(iomode);
if (size)
controller->out_blk_sz = size * 16;
else
controller->out_blk_sz = 4;
size = QUP_IO_M_INPUT_BLOCK_SIZE(iomode);
if (size)
controller->in_blk_sz = size * 16;
else
controller->in_blk_sz = 4;
size = QUP_IO_M_OUTPUT_FIFO_SIZE(iomode);
controller->out_fifo_sz = controller->out_blk_sz * (2 << size);
size = QUP_IO_M_INPUT_FIFO_SIZE(iomode);
controller->in_fifo_sz = controller->in_blk_sz * (2 << size);
dev_info(dev, "v.%08x IN:block:%d, fifo:%d, OUT:block:%d, fifo:%d\n",
data, controller->in_blk_sz, controller->in_fifo_sz,
controller->out_blk_sz, controller->out_fifo_sz);
writel_relaxed(1, base + QUP_SW_RESET);
ret = spi_qup_set_state(controller, QUP_STATE_RESET);
if (ret) {
dev_err(dev, "cannot set RESET state\n");
goto error;
}
writel_relaxed(0, base + QUP_OPERATIONAL);
writel_relaxed(0, base + QUP_IO_M_MODES);
writel_relaxed(0, base + QUP_OPERATIONAL_MASK);
writel_relaxed(SPI_ERROR_CLK_UNDER_RUN | SPI_ERROR_CLK_OVER_RUN,
base + SPI_ERROR_FLAGS_EN);
writel_relaxed(0, base + SPI_CONFIG);
writel_relaxed(SPI_IO_C_NO_TRI_STATE, base + SPI_IO_CONTROL);
ret = devm_request_irq(dev, irq, spi_qup_qup_irq,
IRQF_TRIGGER_HIGH, pdev->name, controller);
if (ret)
goto error;
ret = devm_spi_register_master(dev, master);
if (ret)
goto error;
pm_runtime_set_autosuspend_delay(dev, MSEC_PER_SEC);
pm_runtime_use_autosuspend(dev);
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
return 0;
error:
clk_disable_unprepare(cclk);
clk_disable_unprepare(iclk);
spi_master_put(master);
return ret;
}
#ifdef CONFIG_PM_RUNTIME
static int spi_qup_pm_suspend_runtime(struct device *device)
{
struct spi_master *master = dev_get_drvdata(device);
struct spi_qup *controller = spi_master_get_devdata(master);
u32 config;
/* Enable clocks auto gaiting */
config = readl(controller->base + QUP_CONFIG);
config |= QUP_CLOCK_AUTO_GATE;
writel_relaxed(config, controller->base + QUP_CONFIG);
return 0;
}
static int spi_qup_pm_resume_runtime(struct device *device)
{
struct spi_master *master = dev_get_drvdata(device);
struct spi_qup *controller = spi_master_get_devdata(master);
u32 config;
/* Disable clocks auto gaiting */
config = readl_relaxed(controller->base + QUP_CONFIG);
config &= ~QUP_CLOCK_AUTO_GATE;
writel_relaxed(config, controller->base + QUP_CONFIG);
return 0;
}
#endif /* CONFIG_PM_RUNTIME */
#ifdef CONFIG_PM_SLEEP
static int spi_qup_suspend(struct device *device)
{
struct spi_master *master = dev_get_drvdata(device);
struct spi_qup *controller = spi_master_get_devdata(master);
int ret;
ret = spi_master_suspend(master);
if (ret)
return ret;
ret = spi_qup_set_state(controller, QUP_STATE_RESET);
if (ret)
return ret;
clk_disable_unprepare(controller->cclk);
clk_disable_unprepare(controller->iclk);
return 0;
}
static int spi_qup_resume(struct device *device)
{
struct spi_master *master = dev_get_drvdata(device);
struct spi_qup *controller = spi_master_get_devdata(master);
int ret;
ret = clk_prepare_enable(controller->iclk);
if (ret)
return ret;
ret = clk_prepare_enable(controller->cclk);
if (ret)
return ret;
ret = spi_qup_set_state(controller, QUP_STATE_RESET);
if (ret)
return ret;
return spi_master_resume(master);
}
#endif /* CONFIG_PM_SLEEP */
static int spi_qup_remove(struct platform_device *pdev)
{
struct spi_master *master = dev_get_drvdata(&pdev->dev);
struct spi_qup *controller = spi_master_get_devdata(master);
int ret;
ret = pm_runtime_get_sync(&pdev->dev);
if (ret)
return ret;
ret = spi_qup_set_state(controller, QUP_STATE_RESET);
if (ret)
return ret;
clk_disable_unprepare(controller->cclk);
clk_disable_unprepare(controller->iclk);
pm_runtime_put_noidle(&pdev->dev);
pm_runtime_disable(&pdev->dev);
spi_master_put(master);
return 0;
}
static struct of_device_id spi_qup_dt_match[] = {
{ .compatible = "qcom,spi-qup-v2.1.1", },
{ .compatible = "qcom,spi-qup-v2.2.1", },
{ }
};
MODULE_DEVICE_TABLE(of, spi_qup_dt_match);
static const struct dev_pm_ops spi_qup_dev_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(spi_qup_suspend, spi_qup_resume)
SET_RUNTIME_PM_OPS(spi_qup_pm_suspend_runtime,
spi_qup_pm_resume_runtime,
NULL)
};
static struct platform_driver spi_qup_driver = {
.driver = {
.name = "spi_qup",
.owner = THIS_MODULE,
.pm = &spi_qup_dev_pm_ops,
.of_match_table = spi_qup_dt_match,
},
.probe = spi_qup_probe,
.remove = spi_qup_remove,
};
module_platform_driver(spi_qup_driver);
MODULE_LICENSE("GPL v2");
MODULE_VERSION("0.4");
MODULE_ALIAS("platform:spi_qup");