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openwrt/target/linux/mediatek/patches/0026-spi-mediatek-Add-spi-bus-for-Mediatek-MT8173.patch
John Crispin 25afe99b31 mediatek: add support for the new MT7623 Arm SoC 
the support is still WIP. next steps are to make the pmic and ethernet work.
this is the first commit to make sure nothing gets lost.

Signed-off-by: John Crispin <blogic@openwrt.org>

SVN-Revision: 47354
2015-11-02 10:18:50 +00:00

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19 KiB
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From 047222cfefe97ef8706f03117bc8deada4cb4ddd Mon Sep 17 00:00:00 2001
From: Leilk Liu <leilk.liu@mediatek.com>
Date: Fri, 8 May 2015 16:55:42 +0800
Subject: [PATCH 26/76] spi: mediatek: Add spi bus for Mediatek MT8173
This patch adds basic spi bus for MT8173.
Signed-off-by: Leilk Liu <leilk.liu@mediatek.com>
---
drivers/spi/Kconfig | 10 +
drivers/spi/Makefile | 1 +
drivers/spi/spi-mt65xx.c | 622 ++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 633 insertions(+)
create mode 100644 drivers/spi/spi-mt65xx.c
diff --git a/drivers/spi/Kconfig b/drivers/spi/Kconfig
index 72b0590..53dbea3 100644
--- a/drivers/spi/Kconfig
+++ b/drivers/spi/Kconfig
@@ -325,6 +325,16 @@ 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
+ select SPI_BITBANG
+ 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..92c119d
--- /dev/null
+++ b/drivers/spi/spi-mt65xx.c
@@ -0,0 +1,622 @@
+/*
+ * 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/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/kernel.h>
+#include <linux/spi/spi_bitbang.h>
+#include <linux/gpio.h>
+#include <linux/module.h>
+#include <linux/of_gpio.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_RESUME_MASK 0x2
+#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_MT8173 (0x1 << 1)
+
+#define MT8173_MAX_PAD_SEL 3
+
+#define IDLE 0
+#define INPROGRESS 1
+#define PAUSED 2
+
+#define PACKET_SIZE 1024
+
+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 spi_bitbang bitbang;
+ 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 = 10,
+ .holdtime = 12,
+ .high_time = 6,
+ .low_time = 6,
+ .cs_idletime = 12,
+ .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,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 void mtk_set_pause_bit(struct mtk_spi_ddata *mdata)
+{
+ u32 reg_val;
+
+ reg_val = readl(mdata->base + SPI_CMD_REG);
+ reg_val |= 1 << SPI_CMD_PAUSE_EN_OFFSET;
+ reg_val |= 1 << SPI_CMD_PAUSE_IE_OFFSET;
+ writel(reg_val, mdata->base + SPI_CMD_REG);
+}
+
+static void mtk_clear_pause_bit(struct mtk_spi_ddata *mdata)
+{
+ u32 reg_val;
+
+ reg_val = readl(mdata->base + SPI_CMD_REG);
+ reg_val &= ~SPI_CMD_PAUSE_EN_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_setup_transfer(struct spi_device *spi,
+ struct spi_transfer *t)
+{
+ u32 reg_val;
+ struct spi_master *master = spi->master;
+ struct mtk_spi_ddata *mdata = spi_master_get_devdata(master);
+ struct spi_message *m = master->cur_msg;
+ struct mtk_chip_config *chip_config;
+
+ u8 cpha = spi->mode & SPI_CPHA ? 1 : 0;
+ u8 cpol = spi->mode & SPI_CPOL ? 1 : 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);
+
+ if (t->cs_change) {
+ if (!(list_is_last(&t->transfer_list, &m->transfers)))
+ mdata->state = IDLE;
+ } else {
+ mdata->state = IDLE;
+ mtk_spi_reset(mdata);
+ }
+
+ chip_config = (struct mtk_chip_config *)spi->controller_data;
+ if (!chip_config) {
+ chip_config = (void *)&mtk_default_chip_info;
+ spi->controller_data = chip_config;
+ mdata->state = IDLE;
+ }
+
+ mtk_spi_config(mdata, chip_config);
+
+ return 0;
+}
+
+static void mtk_spi_chipselect(struct spi_device *spi, int is_on)
+{
+ struct mtk_spi_ddata *mdata = spi_master_get_devdata(spi->master);
+
+ switch (is_on) {
+ case BITBANG_CS_ACTIVE:
+ mtk_set_pause_bit(mdata);
+ break;
+ case BITBANG_CS_INACTIVE:
+ mtk_clear_pause_bit(mdata);
+ break;
+ }
+}
+
+static void mtk_spi_start_transfer(struct mtk_spi_ddata *mdata)
+{
+ u32 reg_val;
+
+ reg_val = readl(mdata->base + SPI_CMD_REG);
+ reg_val |= 1 << SPI_CMD_ACT_OFFSET;
+ writel(reg_val, mdata->base + SPI_CMD_REG);
+}
+
+static void mtk_spi_resume_transfer(struct mtk_spi_ddata *mdata)
+{
+ u32 reg_val;
+
+ reg_val = readl(mdata->base + SPI_CMD_REG);
+ reg_val &= ~SPI_CMD_RESUME_MASK;
+ reg_val |= 1 << SPI_CMD_RESUME_OFFSET;
+ writel(reg_val, mdata->base + SPI_CMD_REG);
+}
+
+static int mtk_spi_setup_packet(struct mtk_spi_ddata *mdata,
+ struct spi_transfer *xfer)
+{
+ struct device *dev = &mdata->bitbang.master->dev;
+ u32 packet_size, packet_loop, reg_val;
+
+ packet_size = min_t(unsigned, xfer->len, 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(dev, "ERROR!The lens must be a multiple of %d, your len %d\n",
+ PACKET_SIZE, xfer->len);
+ return -EINVAL;
+ }
+
+ packet_loop = 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);
+
+ return 0;
+}
+
+static int mtk_spi_txrx_bufs(struct spi_device *spi, struct spi_transfer *xfer)
+{
+ struct spi_master *master = spi->master;
+ struct mtk_spi_ddata *mdata = spi_master_get_devdata(master);
+ struct device *dev = &mdata->bitbang.master->dev;
+ int cmd, ret;
+
+ /* mtk spi hw tx/rx have 4bytes aligned restriction,
+ * so kmalloc tx/rx buffer to workaround here.
+ */
+ mdata->tx_buf = NULL;
+ mdata->rx_buf = NULL;
+ if (xfer->tx_buf) {
+ mdata->tx_buf = kmalloc(xfer->len, GFP_KERNEL);
+ if (!mdata->tx_buf) {
+ dev_err(dev, "malloc tx_buf failed.\n");
+ ret = -ENOMEM;
+ goto err_free;
+ }
+ memcpy((void *)mdata->tx_buf, xfer->tx_buf, xfer->len);
+ }
+ if (xfer->rx_buf) {
+ mdata->rx_buf = kmalloc(xfer->len, GFP_KERNEL);
+ if (!mdata->rx_buf) {
+ dev_err(dev, "malloc rx_buf failed.\n");
+ ret = -ENOMEM;
+ goto err_free;
+ }
+ }
+
+ reinit_completion(&mdata->done);
+
+ xfer->tx_dma = DMA_ERROR_CODE;
+ xfer->rx_dma = DMA_ERROR_CODE;
+ if (xfer->tx_buf) {
+ xfer->tx_dma = dma_map_single(dev, (void *)mdata->tx_buf,
+ xfer->len, DMA_TO_DEVICE);
+ if (dma_mapping_error(dev, xfer->tx_dma)) {
+ dev_err(dev, "dma mapping tx_buf error.\n");
+ ret = -ENOMEM;
+ goto err_free;
+ }
+ }
+ if (xfer->rx_buf) {
+ xfer->rx_dma = dma_map_single(dev, mdata->rx_buf,
+ xfer->len, DMA_FROM_DEVICE);
+ if (dma_mapping_error(dev, xfer->rx_dma)) {
+ if (xfer->tx_buf)
+ dma_unmap_single(dev, xfer->tx_dma,
+ xfer->len, DMA_TO_DEVICE);
+ dev_err(dev, "dma mapping rx_buf error.\n");
+ ret = -ENOMEM;
+ goto err_free;
+ }
+ }
+
+ ret = mtk_spi_setup_packet(mdata, xfer);
+ if (ret != 0)
+ goto err_free;
+
+ /* 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);
+
+ /* set up the DMA bus address */
+ if (xfer->tx_dma != DMA_ERROR_CODE)
+ writel(cpu_to_le32(xfer->tx_dma), mdata->base + SPI_TX_SRC_REG);
+ if (xfer->rx_dma != DMA_ERROR_CODE)
+ writel(cpu_to_le32(xfer->rx_dma), mdata->base + SPI_RX_DST_REG);
+
+ if (mdata->state == IDLE)
+ mtk_spi_start_transfer(mdata);
+ else if (mdata->state == PAUSED)
+ mtk_spi_resume_transfer(mdata);
+ else
+ mdata->state = INPROGRESS;
+
+ wait_for_completion(&mdata->done);
+
+ if (xfer->tx_dma != DMA_ERROR_CODE) {
+ dma_unmap_single(dev, xfer->tx_dma, xfer->len, DMA_TO_DEVICE);
+ xfer->tx_dma = DMA_ERROR_CODE;
+ }
+ if (xfer->rx_dma != DMA_ERROR_CODE) {
+ dma_unmap_single(dev, xfer->rx_dma, xfer->len, DMA_FROM_DEVICE);
+ xfer->rx_dma = DMA_ERROR_CODE;
+ }
+
+ /* 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);
+
+ if (xfer->rx_buf)
+ memcpy(xfer->rx_buf, mdata->rx_buf, xfer->len);
+
+ ret = xfer->len;
+
+err_free:
+ kfree(mdata->tx_buf);
+ kfree(mdata->rx_buf);
+ return ret;
+}
+
+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 = PAUSED;
+ else
+ mdata->state = IDLE;
+ complete(&mdata->done);
+
+ return IRQ_HANDLED;
+}
+
+static unsigned long mtk_get_device_prop(struct platform_device *pdev)
+{
+ const struct of_device_id *match;
+
+ match = of_match_node(mtk_spi_of_match, pdev->dev.of_node);
+ return (unsigned long)match->data;
+}
+
+static int mtk_spi_probe(struct platform_device *pdev)
+{
+ struct spi_master *master;
+ struct mtk_spi_ddata *mdata;
+ 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;
+ }
+
+ platform_set_drvdata(pdev, master);
+
+ 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);
+
+ mdata->bitbang.master = master;
+ mdata->bitbang.chipselect = mtk_spi_chipselect;
+ mdata->bitbang.setup_transfer = mtk_spi_setup_transfer;
+ mdata->bitbang.txrx_bufs = mtk_spi_txrx_bufs;
+ mdata->platform_compat = mtk_get_device_prop(pdev);
+
+ 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);
+ goto err;
+ }
+ }
+
+ 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;
+
+ mdata->bitbang.master->dev.dma_mask = pdev->dev.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 = spi_bitbang_start(&mdata->bitbang);
+ if (ret) {
+ dev_err(&pdev->dev, "spi_bitbang_start failed (%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);
+
+ spi_bitbang_stop(&mdata->bitbang);
+ mtk_spi_reset(mdata);
+ clk_disable_unprepare(mdata->clk);
+ spi_master_put(master);
+
+ return 0;
+}
+
+struct platform_driver mtk_spi_driver = {
+ .driver = {
+ .name = "mtk-spi",
+ .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");
--
1.7.10.4
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