- 根目录:
- drivers
- spi
- spi-mt65xx.c
/*
* 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/of_gpio.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;
int pad_num;
u32 *pad_sel;
struct clk *parent_clk, *sel_clk, *spi_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 int mtk_spi_prepare_message(struct spi_master *master,
struct spi_message *msg)
{
u16 cpha, cpol;
u32 reg_val;
struct spi_device *spi = msg->spi;
struct mtk_chip_config *chip_config = spi->controller_data;
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);
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[spi->chip_select],
mdata->base + SPI_PAD_SEL_REG);
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;
writel(reg_val, mdata->base + SPI_CMD_REG);
} else {
reg_val &= ~SPI_CMD_PAUSE_EN;
writel(reg_val, mdata->base + SPI_CMD_REG);
mdata->state = MTK_SPI_IDLE;
mtk_spi_reset(mdata);
}
}
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 int mtk_spi_setup(struct spi_device *spi)
{
struct mtk_spi *mdata = spi_master_get_devdata(spi->master);
if (!spi->controller_data)
spi->controller_data = (void *)&mtk_default_chip_info;
if (mdata->dev_comp->need_pad_sel && gpio_is_valid(spi->cs_gpio))
gpio_direction_output(spi->cs_gpio, !(spi->mode & SPI_CS_HIGH));
return 0;
}
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 i, 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_message = mtk_spi_prepare_message;
master->transfer_one = mtk_spi_transfer_one;
master->can_dma = mtk_spi_can_dma;
master->setup = mtk_spi_setup;
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) {
mdata->pad_num = of_property_count_u32_elems(
pdev->dev.of_node,
"mediatek,pad-select");
if (mdata->pad_num < 0) {
dev_err(&pdev->dev,
"No 'mediatek,pad-select' property\n");
ret = -EINVAL;
goto err_put_master;
}
mdata->pad_sel = devm_kmalloc_array(&pdev->dev, mdata->pad_num,
sizeof(u32), GFP_KERNEL);
if (!mdata->pad_sel) {
ret = -ENOMEM;
goto err_put_master;
}
for (i = 0; i < mdata->pad_num; i++) {
of_property_read_u32_index(pdev->dev.of_node,
"mediatek,pad-select",
i, &mdata->pad_sel[i]);
if (mdata->pad_sel[i] > MT8173_SPI_MAX_PAD_SEL) {
dev_err(&pdev->dev, "wrong pad-sel[%d]: %u\n",
i, mdata->pad_sel[i]);
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->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;
}
mdata->sel_clk = devm_clk_get(&pdev->dev, "sel-clk");
if (IS_ERR(mdata->sel_clk)) {
ret = PTR_ERR(mdata->sel_clk);
dev_err(&pdev->dev, "failed to get sel-clk: %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;
}
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->sel_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;
}
if (mdata->dev_comp->need_pad_sel) {
if (mdata->pad_num != master->num_chipselect) {
dev_err(&pdev->dev,
"pad_num does not match num_chipselect(%d != %d)\n",
mdata->pad_num, master->num_chipselect);
ret = -EINVAL;
goto err_put_master;
}
if (!master->cs_gpios && master->num_chipselect > 1) {
dev_err(&pdev->dev,
"cs_gpios not specified and num_chipselect > 1\n");
ret = -EINVAL;
goto err_put_master;
}
if (master->cs_gpios) {
for (i = 0; i < master->num_chipselect; i++) {
ret = devm_gpio_request(&pdev->dev,
master->cs_gpios[i],
dev_name(&pdev->dev));
if (ret) {
dev_err(&pdev->dev,
"can't get CS GPIO %i\n", i);
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);
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");