This patch adds basic spi bus for MT8173. Signed-off-by: Leilk Liu <leilk.liu@xxxxxxxxxxxx> Signed-off-by: Eddie Huang <eddie.huang@xxxxxxxxxxxx> --- drivers/spi/Kconfig | 9 + drivers/spi/Makefile | 1 + drivers/spi/spi-mt65xx.c | 656 +++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 666 insertions(+) create mode 100644 drivers/spi/spi-mt65xx.c diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig index 198f96b..06f9514 100644 --- a/drivers/spi/Kconfig +++ b/drivers/spi/Kconfig @@ -324,6 +324,15 @@ 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 series ARM SoCs. + config SPI_OC_TINY tristate "OpenCores tiny SPI" depends on GPIOLIB diff --git a/drivers/spi/Makefile b/drivers/spi/Makefile index d8cbf65..ab332ef 100644 --- a/drivers/spi/Makefile +++ b/drivers/spi/Makefile @@ -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 diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c new file mode 100644 index 0000000..6cb54587 --- /dev/null +++ b/drivers/spi/spi-mt65xx.c @@ -0,0 +1,656 @@ +/* + * Copyright (c) 2015 MediaTek Inc. + * Author: Leilk Liu <leilk.liu@xxxxxxxxxxxx> + * + * 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/init.h> +#include <linux/module.h> +#include <linux/device.h> +#include <linux/ioport.h> +#include <linux/errno.h> +#include <linux/spi/spi.h> +#include <linux/workqueue.h> +#include <linux/dma-mapping.h> +#include <linux/platform_device.h> +#include <linux/interrupt.h> +#include <linux/irqreturn.h> +#include <linux/types.h> +#include <linux/delay.h> +#include <linux/clk.h> +#include <linux/err.h> +#include <linux/io.h> +#include <linux/sched.h> +#include <linux/of.h> +#include <linux/of_irq.h> +#include <linux/of_address.h> +#include <linux/of_gpio.h> +#include <linux/kernel.h> +#include <linux/gpio.h> +#include <linux/module.h> +#include <linux/pm_runtime.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_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_CFG0_SCK_HIGH_MASK 0xff +#define SPI_CFG0_SCK_LOW_MASK 0xff00 +#define SPI_CFG0_CS_HOLD_MASK 0xff0000 +#define SPI_CFG0_CS_SETUP_MASK 0xff000000 + +#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_CFG1_GET_TICK_DLY_MASK 0xc0000000 + +#define SPI_CMD_ACT_OFFSET 0 +#define SPI_CMD_RESUME_OFFSET 1 +#define SPI_CMD_RST_OFFSET 2 +#define SPI_CMD_PAUSE_EN_OFFSET 4 +#define SPI_CMD_DEASSERT_OFFSET 5 +#define SPI_CMD_CPHA_OFFSET 8 +#define SPI_CMD_CPOL_OFFSET 9 +#define SPI_CMD_RX_DMA_OFFSET 10 +#define SPI_CMD_TX_DMA_OFFSET 11 +#define SPI_CMD_TXMSBF_OFFSET 12 +#define SPI_CMD_RXMSBF_OFFSET 13 +#define SPI_CMD_RX_ENDIAN_OFFSET 14 +#define SPI_CMD_TX_ENDIAN_OFFSET 15 +#define SPI_CMD_FINISH_IE_OFFSET 16 +#define SPI_CMD_PAUSE_IE_OFFSET 17 + +#define SPI_CMD_RST_MASK 0x4 +#define SPI_CMD_PAUSE_EN_MASK 0x10 +#define SPI_CMD_DEASSERT_MASK 0x20 +#define SPI_CMD_CPHA_MASK 0x100 +#define SPI_CMD_CPOL_MASK 0x200 +#define SPI_CMD_RX_DMA_MASK 0x400 +#define SPI_CMD_TX_DMA_MASK 0x800 +#define SPI_CMD_TXMSBF_MASK 0x1000 +#define SPI_CMD_RXMSBF_MASK 0x2000 +#define SPI_CMD_RX_ENDIAN_MASK 0x4000 +#define SPI_CMD_TX_ENDIAN_MASK 0x8000 +#define SPI_CMD_FINISH_IE_MASK 0x10000 + +#define COMPAT_MT6589 (0x1 << 0) +#define COMPAT_MT8135 (0x1 << 1) +#define COMPAT_MT8173 (0x1 << 2) + +#define MT8173_MAX_PAD_SEL 3 + +#define MTK_SPI_IDLE 0 +#define MTK_SPI_INPROGRESS 1 +#define MTK_SPI_PAUSED 2 + +#define MTK_SPI_PACKET_SIZE 1024 +#define MTK_SPI_MAX_PACKET_LOOP 256 + +struct mtk_chip_config { + u32 setuptime; + u32 holdtime; + u32 high_time; + u32 low_time; + u32 cs_idletime; + u32 tx_mlsb; + u32 rx_mlsb; + u32 tx_endian; + u32 rx_endian; + u32 pause; + u32 finish_intr; + u32 deassert; + u32 tckdly; +}; + +struct mtk_spi_ddata { + struct device *dev; + struct spi_master *master; + void __iomem *base; + u32 irq; + u32 state; + u32 platform_compat; + u32 pad_sel; + struct clk *clk; + + const u8 *tx_buf; + u8 *rx_buf; + u32 tx_len, rx_len; + struct completion done; +}; + +/* + * A piece of default chip info unless the platform + * supplies it. + */ +static const struct mtk_chip_config mtk_default_chip_info = { + .setuptime = 6, + .holdtime = 6, + .high_time = 3, + .low_time = 3, + .cs_idletime = 6, + .rx_mlsb = 1, + .tx_mlsb = 1, + .tx_endian = 0, + .rx_endian = 0, + .pause = 0, + .finish_intr = 1, + .deassert = 0, + .tckdly = 0, +}; + +static const struct of_device_id mtk_spi_of_match[] = { + { .compatible = "mediatek,mt6589-spi", .data = (void *)COMPAT_MT6589}, + { .compatible = "mediatek,mt8135-spi", .data = (void *)COMPAT_MT8135}, + { .compatible = "mediatek,mt8173-spi", .data = (void *)COMPAT_MT8173}, + {} +}; +MODULE_DEVICE_TABLE(of, mtk_spi_of_match); + +static void mtk_spi_reset(struct mtk_spi_ddata *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_MASK; + reg_val |= 1 << SPI_CMD_RST_OFFSET; + writel(reg_val, mdata->base + SPI_CMD_REG); + reg_val = readl(mdata->base + SPI_CMD_REG); + reg_val &= ~SPI_CMD_RST_MASK; + writel(reg_val, mdata->base + SPI_CMD_REG); +} + +static int mtk_spi_config(struct mtk_spi_ddata *mdata, + struct mtk_chip_config *chip_config) +{ + u32 reg_val; + + /* set the timing */ + reg_val = readl(mdata->base + SPI_CFG0_REG); + reg_val &= ~(SPI_CFG0_SCK_HIGH_MASK | SPI_CFG0_SCK_LOW_MASK); + reg_val &= ~(SPI_CFG0_CS_HOLD_MASK | SPI_CFG0_CS_SETUP_MASK); + reg_val |= ((chip_config->high_time - 1) << SPI_CFG0_SCK_HIGH_OFFSET); + reg_val |= ((chip_config->low_time - 1) << SPI_CFG0_SCK_LOW_OFFSET); + reg_val |= ((chip_config->holdtime - 1) << SPI_CFG0_CS_HOLD_OFFSET); + reg_val |= ((chip_config->setuptime - 1) << 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 |= ((chip_config->cs_idletime - 1) << SPI_CFG1_CS_IDLE_OFFSET); + reg_val &= ~SPI_CFG1_GET_TICK_DLY_MASK; + reg_val |= ((chip_config->tckdly) << SPI_CFG1_GET_TICK_DLY_OFFSET); + writel(reg_val, mdata->base + SPI_CFG1_REG); + + /* set the mlsbx and mlsbtx */ + reg_val = readl(mdata->base + SPI_CMD_REG); + reg_val &= ~(SPI_CMD_TX_ENDIAN_MASK | SPI_CMD_RX_ENDIAN_MASK); + reg_val &= ~(SPI_CMD_TXMSBF_MASK | SPI_CMD_RXMSBF_MASK); + reg_val |= (chip_config->tx_mlsb << SPI_CMD_TXMSBF_OFFSET); + reg_val |= (chip_config->rx_mlsb << SPI_CMD_RXMSBF_OFFSET); + reg_val |= (chip_config->tx_endian << SPI_CMD_TX_ENDIAN_OFFSET); + reg_val |= (chip_config->rx_endian << SPI_CMD_RX_ENDIAN_OFFSET); + writel(reg_val, mdata->base + SPI_CMD_REG); + + /* set finish and pause interrupt always enable */ + reg_val = readl(mdata->base + SPI_CMD_REG); + reg_val &= ~SPI_CMD_FINISH_IE_MASK; + reg_val |= (chip_config->finish_intr << SPI_CMD_FINISH_IE_OFFSET); + writel(reg_val, mdata->base + SPI_CMD_REG); + + reg_val = readl(mdata->base + SPI_CMD_REG); + reg_val |= 1 << SPI_CMD_TX_DMA_OFFSET; + reg_val |= 1 << SPI_CMD_RX_DMA_OFFSET; + writel(reg_val, mdata->base + SPI_CMD_REG); + + /* set deassert mode */ + reg_val = readl(mdata->base + SPI_CMD_REG); + reg_val &= ~SPI_CMD_DEASSERT_MASK; + reg_val |= (chip_config->deassert << SPI_CMD_DEASSERT_OFFSET); + writel(reg_val, mdata->base + SPI_CMD_REG); + + /* pad select */ + if (mdata->platform_compat & COMPAT_MT8173) + writel(mdata->pad_sel, mdata->base + SPI_PAD_SEL_REG); + + return 0; +} + +static int mtk_spi_prepare_message(struct spi_master *master, + struct spi_message *msg) +{ + u32 reg_val; + u8 cpha, cpol; + struct spi_transfer *trans; + struct mtk_chip_config *chip_config; + struct spi_device *spi = msg->spi; + struct mtk_spi_ddata *mdata = spi_master_get_devdata(master); + + if (spi->mode & SPI_CPHA) + cpha = 1; + else + cpha = 0; + + if (spi->mode & SPI_CPOL) + cpol = 1; + else + cpol = 0; + + reg_val = readl(mdata->base + SPI_CMD_REG); + reg_val &= ~(SPI_CMD_CPHA_MASK | SPI_CMD_CPOL_MASK); + reg_val |= (cpha << SPI_CMD_CPHA_OFFSET); + reg_val |= (cpol << SPI_CMD_CPOL_OFFSET); + writel(reg_val, mdata->base + SPI_CMD_REG); + + chip_config = (struct mtk_chip_config *)spi->controller_data; + if (!chip_config) { + chip_config = (void *)&mtk_default_chip_info; + spi->controller_data = chip_config; + } + + trans = list_first_entry(&msg->transfers, struct spi_transfer, + transfer_list); + if (trans->cs_change == 0) { + mdata->state = MTK_SPI_IDLE; + mtk_spi_reset(mdata); + } + + 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_ddata *mdata = spi_master_get_devdata(spi->master); + + reg_val = readl(mdata->base + SPI_CMD_REG); + if (!enable) + reg_val |= 1 << SPI_CMD_PAUSE_EN_OFFSET; + else + reg_val &= ~SPI_CMD_PAUSE_EN_MASK; + writel(reg_val, mdata->base + SPI_CMD_REG); +} + +static int mtk_spi_setup_packet(struct mtk_spi_ddata *mdata, + struct spi_transfer *xfer) +{ + u32 packet_size, packet_loop, reg_val; + + packet_size = min_t(unsigned, xfer->len, MTK_SPI_PACKET_SIZE); + + /* mtk hw has the restriction that xfer len must be a multiple of 1024, + * when it is greater than 1024bytes. + */ + if (xfer->len % packet_size) { + dev_err(mdata->dev, "ERROR!The lens must be a multiple of %d, your len %d\n", + MTK_SPI_PACKET_SIZE, xfer->len); + return -EINVAL; + } + + packet_loop = xfer->len / packet_size; + if (packet_loop > MTK_SPI_MAX_PACKET_LOOP) { + dev_err(mdata->dev, "packet_loop(%d) error\n", packet_loop); + return -EINVAL; + } + + 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); + + return 0; +} + +static int mtk_spi_transfer_one(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + int cmd = 0, ret = 0; + unsigned int tx_sgl_len = 0, rx_sgl_len = 0; + struct scatterlist *tx_sgl = NULL, *rx_sgl = NULL; + struct mtk_spi_ddata *mdata = spi_master_get_devdata(master); + + /* Here is mt8173 HW issue: RX must enable TX, then TX transfer + * dummy data; TX don't need to enable RX. so enable TX dma for + * RX to workaround. + */ + cmd = readl(mdata->base + SPI_CMD_REG); + if (xfer->tx_buf || (mdata->platform_compat & COMPAT_MT8173)) + cmd |= 1 << SPI_CMD_TX_DMA_OFFSET; + if (xfer->rx_buf) + cmd |= 1 << SPI_CMD_RX_DMA_OFFSET; + writel(cmd, mdata->base + SPI_CMD_REG); + + if (xfer->tx_buf) + tx_sgl = xfer->tx_sg.sgl; + if (xfer->rx_buf) + rx_sgl = xfer->rx_sg.sgl; + + while (rx_sgl || tx_sgl) { + if (tx_sgl && (tx_sgl_len == 0)) { + xfer->tx_dma = sg_dma_address(tx_sgl); + tx_sgl_len = sg_dma_len(tx_sgl); + } + if (rx_sgl && (rx_sgl_len == 0)) { + xfer->rx_dma = sg_dma_address(rx_sgl); + rx_sgl_len = sg_dma_len(rx_sgl); + } + + if (tx_sgl && rx_sgl) + xfer->len = min_t(unsigned int, tx_sgl_len, rx_sgl_len); + else + xfer->len = max_t(unsigned int, tx_sgl_len, rx_sgl_len); + + ret = mtk_spi_setup_packet(mdata, xfer); + if (ret != 0) + return ret; + + /* set up the DMA bus address */ + writel(cpu_to_le32(xfer->tx_dma), mdata->base + SPI_TX_SRC_REG); + writel(cpu_to_le32(xfer->rx_dma), mdata->base + SPI_RX_DST_REG); + + /* trigger to transfer */ + if (mdata->state == MTK_SPI_IDLE) { + cmd = readl(mdata->base + SPI_CMD_REG); + cmd |= 1 << SPI_CMD_ACT_OFFSET; + writel(cmd, mdata->base + SPI_CMD_REG); + } else if (mdata->state == MTK_SPI_PAUSED) { + cmd = readl(mdata->base + SPI_CMD_REG); + cmd |= 1 << SPI_CMD_RESUME_OFFSET; + writel(cmd, mdata->base + SPI_CMD_REG); + } else { + mdata->state = MTK_SPI_INPROGRESS; + } + + wait_for_completion(&mdata->done); + + if (tx_sgl && rx_sgl) { + if (tx_sgl_len > rx_sgl_len) { + xfer->tx_dma += rx_sgl_len; + tx_sgl_len -= rx_sgl_len; + rx_sgl_len = 0; + rx_sgl = sg_next(rx_sgl); + continue; + } else if (tx_sgl_len < rx_sgl_len) { + xfer->rx_dma += tx_sgl_len; + rx_sgl_len -= tx_sgl_len; + tx_sgl_len = 0; + tx_sgl = sg_next(tx_sgl); + continue; + } + } + + rx_sgl_len = 0; + tx_sgl_len = 0; + + if (rx_sgl) + rx_sgl = sg_next(rx_sgl); + if (tx_sgl) + tx_sgl = sg_next(tx_sgl); + } + + /* spi disable dma */ + cmd = readl(mdata->base + SPI_CMD_REG); + cmd &= ~SPI_CMD_TX_DMA_MASK; + cmd &= ~SPI_CMD_RX_DMA_MASK; + writel(cmd, mdata->base + SPI_CMD_REG); + + return ret; +} + +static bool mtk_spi_can_dma(struct spi_master *master, + struct spi_device *spi, + struct spi_transfer *xfer) +{ + return true; +} + +static irqreturn_t mtk_spi_interrupt(int irq, void *dev_id) +{ + struct mtk_spi_ddata *mdata = dev_id; + u32 reg_val; + + reg_val = readl(mdata->base + SPI_STATUS0_REG); + if (reg_val & 0x2) + mdata->state = MTK_SPI_PAUSED; + else + mdata->state = MTK_SPI_IDLE; + + complete(&mdata->done); + + return IRQ_HANDLED; +} + +static int mtk_spi_probe(struct platform_device *pdev) +{ + struct spi_master *master; + struct mtk_spi_ddata *mdata; + const struct of_device_id *of_id; + struct resource *res; + int ret; + + master = spi_alloc_master(&pdev->dev, sizeof(struct mtk_spi_ddata)); + if (!master) { + dev_err(&pdev->dev, "failed to alloc spi master\n"); + return -ENOMEM; + } + + pm_runtime_set_active(&pdev->dev); + pm_runtime_enable(&pdev->dev); + + master->auto_runtime_pm = true; + master->dev.of_node = pdev->dev.of_node; + master->bus_num = pdev->id; + master->num_chipselect = 1; + master->mode_bits = SPI_CPOL | SPI_CPHA; + + mdata = spi_master_get_devdata(master); + memset(mdata, 0, sizeof(struct mtk_spi_ddata)); + + mdata->master = master; + mdata->dev = &pdev->dev; + + 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; + + 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; + } + + mdata->platform_compat = (unsigned long)of_id->data; + + if (mdata->platform_compat & COMPAT_MT8173) { + ret = of_property_read_u32(pdev->dev.of_node, "pad-select", + &mdata->pad_sel); + if (ret) { + dev_err(&pdev->dev, "failed to read pad select: %d\n", + ret); + goto err; + } + + if (mdata->pad_sel > MT8173_MAX_PAD_SEL) { + dev_err(&pdev->dev, "wrong pad-select: %u\n", + mdata->pad_sel); + ret = -EINVAL; + goto err; + } + } + + platform_set_drvdata(pdev, master); + init_completion(&mdata->done); + + mdata->clk = devm_clk_get(&pdev->dev, "main"); + if (IS_ERR(mdata->clk)) { + ret = PTR_ERR(mdata->clk); + dev_err(&pdev->dev, "failed to get clock: %d\n", ret); + goto err; + } + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + ret = -ENODEV; + dev_err(&pdev->dev, "failed to determine base address\n"); + goto err; + } + + mdata->base = devm_ioremap_resource(&pdev->dev, res); + if (IS_ERR(mdata->base)) { + ret = PTR_ERR(mdata->base); + goto err; + } + + ret = platform_get_irq(pdev, 0); + if (ret < 0) { + dev_err(&pdev->dev, "failed to get irq (%d)\n", ret); + goto err; + } + + mdata->irq = ret; + + if (!pdev->dev.dma_mask) + pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask; + + ret = clk_prepare_enable(mdata->clk); + if (ret < 0) { + dev_err(&pdev->dev, "failed to enable clock (%d)\n", ret); + goto err; + } + + ret = devm_request_irq(&pdev->dev, mdata->irq, mtk_spi_interrupt, + IRQF_TRIGGER_NONE, dev_name(&pdev->dev), mdata); + if (ret) { + dev_err(&pdev->dev, "failed to register irq (%d)\n", ret); + goto err_disable_clk; + } + + ret = devm_spi_register_master(&pdev->dev, master); + if (ret) { + dev_err(&pdev->dev, "failed to register master (%d)\n", ret); +err_disable_clk: + clk_disable_unprepare(mdata->clk); +err: + 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_ddata *mdata = spi_master_get_devdata(master); + + pm_runtime_disable(&pdev->dev); + + mtk_spi_reset(mdata); + clk_disable_unprepare(mdata->clk); + spi_master_put(master); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int mtk_spi_suspend(struct device *dev) +{ + int ret = 0; + struct spi_master *master = dev_get_drvdata(dev); + struct mtk_spi_ddata *mdata = spi_master_get_devdata(master); + + ret = spi_master_suspend(master); + if (ret) + return ret; + + if (!pm_runtime_suspended(dev)) + clk_disable_unprepare(mdata->clk); + + return ret; +} + +static int mtk_spi_resume(struct device *dev) +{ + int ret = 0; + struct spi_master *master = dev_get_drvdata(dev); + struct mtk_spi_ddata *mdata = spi_master_get_devdata(master); + + if (!pm_runtime_suspended(dev)) { + ret = clk_prepare_enable(mdata->clk); + if (ret < 0) + return ret; + } + + return spi_master_resume(master); +} +#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_ddata *mdata = spi_master_get_devdata(master); + + clk_disable_unprepare(mdata->clk); + + return 0; +} + +static int mtk_spi_runtime_resume(struct device *dev) +{ + struct spi_master *master = dev_get_drvdata(dev); + struct mtk_spi_ddata *mdata = spi_master_get_devdata(master); + + return clk_prepare_enable(mdata->clk); +} +#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) +}; + +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@xxxxxxxxxxxx>"); +MODULE_LICENSE("GPL v2"); +MODULE_ALIAS("platform: mtk_spi"); -- 1.8.1.1.dirty -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html