linux/drivers/spi/spi-bcmbca-hsspi.c
Amit Kumar Mahapatra via Alsa-devel 9e264f3f85
spi: Replace all spi->chip_select and spi->cs_gpiod references with function call
Supporting multi-cs in spi drivers would require the chip_select & cs_gpiod
members of struct spi_device to be an array. But changing the type of these
members to array would break the spi driver functionality. To make the
transition smoother introduced four new APIs to get/set the
spi->chip_select & spi->cs_gpiod and replaced all spi->chip_select and
spi->cs_gpiod references with get or set API calls.
While adding multi-cs support in further patches the chip_select & cs_gpiod
members of the spi_device structure would be converted to arrays & the
"idx" parameter of the APIs would be used as array index i.e.,
spi->chip_select[idx] & spi->cs_gpiod[idx] respectively.

Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@amd.com>
Acked-by: Heiko Stuebner <heiko@sntech.de> # Rockchip drivers
Reviewed-by: Michal Simek <michal.simek@amd.com>
Reviewed-by: Cédric Le Goater <clg@kaod.org> # Aspeed driver
Reviewed-by: Dhruva Gole <d-gole@ti.com> # SPI Cadence QSPI
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com> # spi-stm32-qspi
Acked-by: William Zhang <william.zhang@broadcom.com> # bcm63xx-hsspi driver
Reviewed-by: Serge Semin <fancer.lancer@gmail.com> # DW SSI part
Link: https://lore.kernel.org/r/167847070432.26.15076794204368669839@mailman-core.alsa-project.org
Signed-off-by: Mark Brown <broonie@kernel.org>
2023-03-11 12:34:01 +00:00

653 lines
17 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
* Broadcom BCMBCA High Speed SPI Controller driver
*
* Copyright 2000-2010 Broadcom Corporation
* Copyright 2012-2013 Jonas Gorski <jogo@openwrt.org>
* Copyright 2019-2022 Broadcom Ltd
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/err.h>
#include <linux/interrupt.h>
#include <linux/spi/spi.h>
#include <linux/mutex.h>
#include <linux/of.h>
#include <linux/spi/spi-mem.h>
#include <linux/pm_runtime.h>
#define HSSPI_GLOBAL_CTRL_REG 0x0
#define GLOBAL_CTRL_CS_POLARITY_SHIFT 0
#define GLOBAL_CTRL_CS_POLARITY_MASK 0x000000ff
#define GLOBAL_CTRL_PLL_CLK_CTRL_SHIFT 8
#define GLOBAL_CTRL_PLL_CLK_CTRL_MASK 0x0000ff00
#define GLOBAL_CTRL_CLK_GATE_SSOFF BIT(16)
#define GLOBAL_CTRL_CLK_POLARITY BIT(17)
#define GLOBAL_CTRL_MOSI_IDLE BIT(18)
#define HSSPI_GLOBAL_EXT_TRIGGER_REG 0x4
#define HSSPI_INT_STATUS_REG 0x8
#define HSSPI_INT_STATUS_MASKED_REG 0xc
#define HSSPI_INT_MASK_REG 0x10
#define HSSPI_PINGx_CMD_DONE(i) BIT((i * 8) + 0)
#define HSSPI_PINGx_RX_OVER(i) BIT((i * 8) + 1)
#define HSSPI_PINGx_TX_UNDER(i) BIT((i * 8) + 2)
#define HSSPI_PINGx_POLL_TIMEOUT(i) BIT((i * 8) + 3)
#define HSSPI_PINGx_CTRL_INVAL(i) BIT((i * 8) + 4)
#define HSSPI_INT_CLEAR_ALL 0xff001f1f
#define HSSPI_PINGPONG_COMMAND_REG(x) (0x80 + (x) * 0x40)
#define PINGPONG_CMD_COMMAND_MASK 0xf
#define PINGPONG_COMMAND_NOOP 0
#define PINGPONG_COMMAND_START_NOW 1
#define PINGPONG_COMMAND_START_TRIGGER 2
#define PINGPONG_COMMAND_HALT 3
#define PINGPONG_COMMAND_FLUSH 4
#define PINGPONG_CMD_PROFILE_SHIFT 8
#define PINGPONG_CMD_SS_SHIFT 12
#define HSSPI_PINGPONG_STATUS_REG(x) (0x84 + (x) * 0x40)
#define HSSPI_PINGPONG_STATUS_SRC_BUSY BIT(1)
#define HSSPI_PROFILE_CLK_CTRL_REG(x) (0x100 + (x) * 0x20)
#define CLK_CTRL_FREQ_CTRL_MASK 0x0000ffff
#define CLK_CTRL_SPI_CLK_2X_SEL BIT(14)
#define CLK_CTRL_ACCUM_RST_ON_LOOP BIT(15)
#define CLK_CTRL_CLK_POLARITY BIT(16)
#define HSSPI_PROFILE_SIGNAL_CTRL_REG(x) (0x104 + (x) * 0x20)
#define SIGNAL_CTRL_LATCH_RISING BIT(12)
#define SIGNAL_CTRL_LAUNCH_RISING BIT(13)
#define SIGNAL_CTRL_ASYNC_INPUT_PATH BIT(16)
#define HSSPI_PROFILE_MODE_CTRL_REG(x) (0x108 + (x) * 0x20)
#define MODE_CTRL_MULTIDATA_RD_STRT_SHIFT 8
#define MODE_CTRL_MULTIDATA_WR_STRT_SHIFT 12
#define MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT 16
#define MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT 18
#define MODE_CTRL_MODE_3WIRE BIT(20)
#define MODE_CTRL_PREPENDBYTE_CNT_SHIFT 24
#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)
#define HSSPI_OP_WRITE (2 << HSSPI_OP_CODE_SHIFT)
#define HSSPI_OP_READ (3 << HSSPI_OP_CODE_SHIFT)
#define HSSPI_OP_SETIRQ (4 << HSSPI_OP_CODE_SHIFT)
#define HSSPI_BUFFER_LEN 512
#define HSSPI_OPCODE_LEN 2
#define HSSPI_MAX_PREPEND_LEN 15
#define HSSPI_MAX_SYNC_CLOCK 30000000
#define HSSPI_SPI_MAX_CS 8
#define HSSPI_BUS_NUM 1 /* 0 is legacy SPI */
#define HSSPI_POLL_STATUS_TIMEOUT_MS 100
#define HSSPI_WAIT_MODE_POLLING 0
#define HSSPI_WAIT_MODE_INTR 1
#define HSSPI_WAIT_MODE_MAX HSSPI_WAIT_MODE_INTR
#define SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT 0
#define SPIM_CTRL_CS_OVERRIDE_SEL_MASK 0xff
#define SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT 8
#define SPIM_CTRL_CS_OVERRIDE_VAL_MASK 0xff
struct bcmbca_hsspi {
struct completion done;
struct mutex bus_mutex;
struct mutex msg_mutex;
struct platform_device *pdev;
struct clk *clk;
struct clk *pll_clk;
void __iomem *regs;
void __iomem *spim_ctrl;
u8 __iomem *fifo;
u32 speed_hz;
u8 cs_polarity;
u32 wait_mode;
};
static ssize_t wait_mode_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct spi_controller *ctrl = dev_get_drvdata(dev);
struct bcmbca_hsspi *bs = spi_master_get_devdata(ctrl);
return sprintf(buf, "%d\n", bs->wait_mode);
}
static ssize_t wait_mode_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct spi_controller *ctrl = dev_get_drvdata(dev);
struct bcmbca_hsspi *bs = spi_master_get_devdata(ctrl);
u32 val;
if (kstrtou32(buf, 10, &val))
return -EINVAL;
if (val > HSSPI_WAIT_MODE_MAX) {
dev_warn(dev, "invalid wait mode %u\n", val);
return -EINVAL;
}
mutex_lock(&bs->msg_mutex);
bs->wait_mode = val;
/* clear interrupt status to avoid spurious int on next transfer */
if (val == HSSPI_WAIT_MODE_INTR)
__raw_writel(HSSPI_INT_CLEAR_ALL, bs->regs + HSSPI_INT_STATUS_REG);
mutex_unlock(&bs->msg_mutex);
return count;
}
static DEVICE_ATTR_RW(wait_mode);
static struct attribute *bcmbca_hsspi_attrs[] = {
&dev_attr_wait_mode.attr,
NULL,
};
static const struct attribute_group bcmbca_hsspi_group = {
.attrs = bcmbca_hsspi_attrs,
};
static void bcmbca_hsspi_set_cs(struct bcmbca_hsspi *bs, unsigned int cs,
bool active)
{
u32 reg;
/* No cs orerriden needed for SS7 internal cs on pcm based voice dev */
if (cs == 7)
return;
mutex_lock(&bs->bus_mutex);
reg = __raw_readl(bs->spim_ctrl);
if (active)
reg |= BIT(cs + SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT);
else
reg &= ~BIT(cs + SPIM_CTRL_CS_OVERRIDE_SEL_SHIFT);
__raw_writel(reg, bs->spim_ctrl);
mutex_unlock(&bs->bus_mutex);
}
static void bcmbca_hsspi_set_clk(struct bcmbca_hsspi *bs,
struct spi_device *spi, int hz)
{
unsigned int profile = spi_get_chipselect(spi, 0);
u32 reg;
reg = DIV_ROUND_UP(2048, DIV_ROUND_UP(bs->speed_hz, hz));
__raw_writel(CLK_CTRL_ACCUM_RST_ON_LOOP | reg,
bs->regs + HSSPI_PROFILE_CLK_CTRL_REG(profile));
reg = __raw_readl(bs->regs + HSSPI_PROFILE_SIGNAL_CTRL_REG(profile));
if (hz > HSSPI_MAX_SYNC_CLOCK)
reg |= SIGNAL_CTRL_ASYNC_INPUT_PATH;
else
reg &= ~SIGNAL_CTRL_ASYNC_INPUT_PATH;
__raw_writel(reg, bs->regs + HSSPI_PROFILE_SIGNAL_CTRL_REG(profile));
mutex_lock(&bs->bus_mutex);
/* setup clock polarity */
reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG);
reg &= ~GLOBAL_CTRL_CLK_POLARITY;
if (spi->mode & SPI_CPOL)
reg |= GLOBAL_CTRL_CLK_POLARITY;
__raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG);
mutex_unlock(&bs->bus_mutex);
}
static int bcmbca_hsspi_wait_cmd(struct bcmbca_hsspi *bs, unsigned int cs)
{
unsigned long limit;
u32 reg = 0;
int rc = 0;
if (bs->wait_mode == HSSPI_WAIT_MODE_INTR) {
if (wait_for_completion_timeout(&bs->done, HZ) == 0)
rc = 1;
} else {
limit = jiffies + msecs_to_jiffies(HSSPI_POLL_STATUS_TIMEOUT_MS);
while (!time_after(jiffies, limit)) {
reg = __raw_readl(bs->regs + HSSPI_PINGPONG_STATUS_REG(0));
if (reg & HSSPI_PINGPONG_STATUS_SRC_BUSY)
cpu_relax();
else
break;
}
if (reg & HSSPI_PINGPONG_STATUS_SRC_BUSY)
rc = 1;
}
if (rc)
dev_err(&bs->pdev->dev, "transfer timed out!\n");
return rc;
}
static int bcmbca_hsspi_do_txrx(struct spi_device *spi, struct spi_transfer *t,
struct spi_message *msg)
{
struct bcmbca_hsspi *bs = spi_master_get_devdata(spi->master);
unsigned int chip_select = spi_get_chipselect(spi, 0);
u16 opcode = 0, val;
int pending = t->len;
int step_size = HSSPI_BUFFER_LEN;
const u8 *tx = t->tx_buf;
u8 *rx = t->rx_buf;
u32 reg = 0, cs_act = 0;
bcmbca_hsspi_set_clk(bs, spi, t->speed_hz);
if (tx && rx)
opcode = HSSPI_OP_READ_WRITE;
else if (tx)
opcode = HSSPI_OP_WRITE;
else if (rx)
opcode = HSSPI_OP_READ;
if (opcode != HSSPI_OP_READ)
step_size -= HSSPI_OPCODE_LEN;
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;
if (t->rx_nbits == SPI_NBITS_DUAL)
reg |= 1 << MODE_CTRL_MULTIDATA_RD_SIZE_SHIFT;
if (t->tx_nbits == SPI_NBITS_DUAL)
reg |= 1 << MODE_CTRL_MULTIDATA_WR_SIZE_SHIFT;
}
__raw_writel(reg | 0xff,
bs->regs + HSSPI_PROFILE_MODE_CTRL_REG(chip_select));
while (pending > 0) {
int curr_step = min_t(int, step_size, pending);
reinit_completion(&bs->done);
if (tx) {
memcpy_toio(bs->fifo + HSSPI_OPCODE_LEN, tx, curr_step);
tx += curr_step;
}
*(__be16 *)(&val) = cpu_to_be16(opcode | curr_step);
__raw_writew(val, bs->fifo);
/* enable interrupt */
if (bs->wait_mode == HSSPI_WAIT_MODE_INTR)
__raw_writel(HSSPI_PINGx_CMD_DONE(0),
bs->regs + HSSPI_INT_MASK_REG);
if (!cs_act) {
/* must apply cs signal as close as the cmd starts */
bcmbca_hsspi_set_cs(bs, chip_select, true);
cs_act = 1;
}
reg = chip_select << PINGPONG_CMD_SS_SHIFT |
chip_select << PINGPONG_CMD_PROFILE_SHIFT |
PINGPONG_COMMAND_START_NOW;
__raw_writel(reg, bs->regs + HSSPI_PINGPONG_COMMAND_REG(0));
if (bcmbca_hsspi_wait_cmd(bs, spi_get_chipselect(spi, 0)))
return -ETIMEDOUT;
pending -= curr_step;
if (rx) {
memcpy_fromio(rx, bs->fifo, curr_step);
rx += curr_step;
}
}
return 0;
}
static int bcmbca_hsspi_setup(struct spi_device *spi)
{
struct bcmbca_hsspi *bs = spi_master_get_devdata(spi->master);
u32 reg;
reg = __raw_readl(bs->regs +
HSSPI_PROFILE_SIGNAL_CTRL_REG(spi_get_chipselect(spi, 0)));
reg &= ~(SIGNAL_CTRL_LAUNCH_RISING | SIGNAL_CTRL_LATCH_RISING);
if (spi->mode & SPI_CPHA)
reg |= SIGNAL_CTRL_LAUNCH_RISING;
else
reg |= SIGNAL_CTRL_LATCH_RISING;
__raw_writel(reg, bs->regs +
HSSPI_PROFILE_SIGNAL_CTRL_REG(spi_get_chipselect(spi, 0)));
mutex_lock(&bs->bus_mutex);
reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG);
if (spi->mode & SPI_CS_HIGH)
reg |= BIT(spi_get_chipselect(spi, 0));
else
reg &= ~BIT(spi_get_chipselect(spi, 0));
__raw_writel(reg, bs->regs + HSSPI_GLOBAL_CTRL_REG);
if (spi->mode & SPI_CS_HIGH)
bs->cs_polarity |= BIT(spi_get_chipselect(spi, 0));
else
bs->cs_polarity &= ~BIT(spi_get_chipselect(spi, 0));
reg = __raw_readl(bs->spim_ctrl);
reg &= ~BIT(spi_get_chipselect(spi, 0) + SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT);
if (spi->mode & SPI_CS_HIGH)
reg |= BIT(spi_get_chipselect(spi, 0) + SPIM_CTRL_CS_OVERRIDE_VAL_SHIFT);
__raw_writel(reg, bs->spim_ctrl);
mutex_unlock(&bs->bus_mutex);
return 0;
}
static int bcmbca_hsspi_transfer_one(struct spi_master *master,
struct spi_message *msg)
{
struct bcmbca_hsspi *bs = spi_master_get_devdata(master);
struct spi_transfer *t;
struct spi_device *spi = msg->spi;
int status = -EINVAL;
bool keep_cs = false;
mutex_lock(&bs->msg_mutex);
list_for_each_entry(t, &msg->transfers, transfer_list) {
status = bcmbca_hsspi_do_txrx(spi, t, msg);
if (status)
break;
spi_transfer_delay_exec(t);
if (t->cs_change) {
if (list_is_last(&t->transfer_list, &msg->transfers)) {
keep_cs = true;
} else {
if (!t->cs_off)
bcmbca_hsspi_set_cs(bs, spi_get_chipselect(spi, 0), false);
spi_transfer_cs_change_delay_exec(msg, t);
if (!list_next_entry(t, transfer_list)->cs_off)
bcmbca_hsspi_set_cs(bs, spi_get_chipselect(spi, 0), true);
}
} else if (!list_is_last(&t->transfer_list, &msg->transfers) &&
t->cs_off != list_next_entry(t, transfer_list)->cs_off) {
bcmbca_hsspi_set_cs(bs, spi_get_chipselect(spi, 0), t->cs_off);
}
msg->actual_length += t->len;
}
mutex_unlock(&bs->msg_mutex);
if (status || !keep_cs)
bcmbca_hsspi_set_cs(bs, spi_get_chipselect(spi, 0), false);
msg->status = status;
spi_finalize_current_message(master);
return 0;
}
static irqreturn_t bcmbca_hsspi_interrupt(int irq, void *dev_id)
{
struct bcmbca_hsspi *bs = (struct bcmbca_hsspi *)dev_id;
if (__raw_readl(bs->regs + HSSPI_INT_STATUS_MASKED_REG) == 0)
return IRQ_NONE;
__raw_writel(HSSPI_INT_CLEAR_ALL, bs->regs + HSSPI_INT_STATUS_REG);
__raw_writel(0, bs->regs + HSSPI_INT_MASK_REG);
complete(&bs->done);
return IRQ_HANDLED;
}
static int bcmbca_hsspi_probe(struct platform_device *pdev)
{
struct spi_master *master;
struct bcmbca_hsspi *bs;
struct resource *res_mem;
void __iomem *spim_ctrl;
void __iomem *regs;
struct device *dev = &pdev->dev;
struct clk *clk, *pll_clk = NULL;
int irq, ret;
u32 reg, rate, num_cs = HSSPI_SPI_MAX_CS;
irq = platform_get_irq(pdev, 0);
if (irq < 0)
return irq;
res_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "hsspi");
if (!res_mem)
return -EINVAL;
regs = devm_ioremap_resource(dev, res_mem);
if (IS_ERR(regs))
return PTR_ERR(regs);
res_mem = platform_get_resource_byname(pdev, IORESOURCE_MEM, "spim-ctrl");
if (!res_mem)
return -EINVAL;
spim_ctrl = devm_ioremap_resource(dev, res_mem);
if (IS_ERR(spim_ctrl))
return PTR_ERR(spim_ctrl);
clk = devm_clk_get(dev, "hsspi");
if (IS_ERR(clk))
return PTR_ERR(clk);
ret = clk_prepare_enable(clk);
if (ret)
return ret;
rate = clk_get_rate(clk);
if (!rate) {
pll_clk = devm_clk_get(dev, "pll");
if (IS_ERR(pll_clk)) {
ret = PTR_ERR(pll_clk);
goto out_disable_clk;
}
ret = clk_prepare_enable(pll_clk);
if (ret)
goto out_disable_clk;
rate = clk_get_rate(pll_clk);
if (!rate) {
ret = -EINVAL;
goto out_disable_pll_clk;
}
}
master = spi_alloc_master(&pdev->dev, sizeof(*bs));
if (!master) {
ret = -ENOMEM;
goto out_disable_pll_clk;
}
bs = spi_master_get_devdata(master);
bs->pdev = pdev;
bs->clk = clk;
bs->pll_clk = pll_clk;
bs->regs = regs;
bs->spim_ctrl = spim_ctrl;
bs->speed_hz = rate;
bs->fifo = (u8 __iomem *) (bs->regs + HSSPI_FIFO_REG(0));
bs->wait_mode = HSSPI_WAIT_MODE_POLLING;
mutex_init(&bs->bus_mutex);
mutex_init(&bs->msg_mutex);
init_completion(&bs->done);
master->dev.of_node = dev->of_node;
if (!dev->of_node)
master->bus_num = HSSPI_BUS_NUM;
of_property_read_u32(dev->of_node, "num-cs", &num_cs);
if (num_cs > 8) {
dev_warn(dev, "unsupported number of cs (%i), reducing to 8\n",
num_cs);
num_cs = HSSPI_SPI_MAX_CS;
}
master->num_chipselect = num_cs;
master->setup = bcmbca_hsspi_setup;
master->transfer_one_message = bcmbca_hsspi_transfer_one;
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;
platform_set_drvdata(pdev, master);
/* Initialize the hardware */
__raw_writel(0, bs->regs + HSSPI_INT_MASK_REG);
/* clean up any pending interrupts */
__raw_writel(HSSPI_INT_CLEAR_ALL, bs->regs + HSSPI_INT_STATUS_REG);
/* read out default CS polarities */
reg = __raw_readl(bs->regs + HSSPI_GLOBAL_CTRL_REG);
bs->cs_polarity = reg & GLOBAL_CTRL_CS_POLARITY_MASK;
__raw_writel(reg | GLOBAL_CTRL_CLK_GATE_SSOFF,
bs->regs + HSSPI_GLOBAL_CTRL_REG);
if (irq > 0) {
ret = devm_request_irq(dev, irq, bcmbca_hsspi_interrupt, IRQF_SHARED,
pdev->name, bs);
if (ret)
goto out_put_master;
}
pm_runtime_enable(&pdev->dev);
ret = sysfs_create_group(&pdev->dev.kobj, &bcmbca_hsspi_group);
if (ret) {
dev_err(&pdev->dev, "couldn't register sysfs group\n");
goto out_pm_disable;
}
/* register and we are done */
ret = devm_spi_register_master(dev, master);
if (ret)
goto out_sysgroup_disable;
dev_info(dev, "Broadcom BCMBCA High Speed SPI Controller driver");
return 0;
out_sysgroup_disable:
sysfs_remove_group(&pdev->dev.kobj, &bcmbca_hsspi_group);
out_pm_disable:
pm_runtime_disable(&pdev->dev);
out_put_master:
spi_master_put(master);
out_disable_pll_clk:
clk_disable_unprepare(pll_clk);
out_disable_clk:
clk_disable_unprepare(clk);
return ret;
}
static void bcmbca_hsspi_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
struct bcmbca_hsspi *bs = spi_master_get_devdata(master);
/* reset the hardware and block queue progress */
__raw_writel(0, bs->regs + HSSPI_INT_MASK_REG);
clk_disable_unprepare(bs->pll_clk);
clk_disable_unprepare(bs->clk);
sysfs_remove_group(&pdev->dev.kobj, &bcmbca_hsspi_group);
}
#ifdef CONFIG_PM_SLEEP
static int bcmbca_hsspi_suspend(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct bcmbca_hsspi *bs = spi_master_get_devdata(master);
spi_master_suspend(master);
clk_disable_unprepare(bs->pll_clk);
clk_disable_unprepare(bs->clk);
return 0;
}
static int bcmbca_hsspi_resume(struct device *dev)
{
struct spi_master *master = dev_get_drvdata(dev);
struct bcmbca_hsspi *bs = spi_master_get_devdata(master);
int ret;
ret = clk_prepare_enable(bs->clk);
if (ret)
return ret;
if (bs->pll_clk) {
ret = clk_prepare_enable(bs->pll_clk);
if (ret) {
clk_disable_unprepare(bs->clk);
return ret;
}
}
spi_master_resume(master);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(bcmbca_hsspi_pm_ops, bcmbca_hsspi_suspend,
bcmbca_hsspi_resume);
static const struct of_device_id bcmbca_hsspi_of_match[] = {
{ .compatible = "brcm,bcmbca-hsspi-v1.1", },
{},
};
MODULE_DEVICE_TABLE(of, bcmbca_hsspi_of_match);
static struct platform_driver bcmbca_hsspi_driver = {
.driver = {
.name = "bcmbca-hsspi",
.pm = &bcmbca_hsspi_pm_ops,
.of_match_table = bcmbca_hsspi_of_match,
},
.probe = bcmbca_hsspi_probe,
.remove_new = bcmbca_hsspi_remove,
};
module_platform_driver(bcmbca_hsspi_driver);
MODULE_ALIAS("platform:bcmbca_hsspi");
MODULE_DESCRIPTION("Broadcom BCMBCA High Speed SPI Controller driver");
MODULE_LICENSE("GPL");