[PATCH v2 3/4] spi: mediatek: Add spi bus for Mediatek MT8173
From: Leilk Liu
Date: Mon Jun 29 2015 - 09:06:06 EST
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
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