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-rw-r--r--target/linux/mediatek/patches/0026-spi-mediatek-Add-spi-bus-for-Mediatek-MT8173.patch679
1 files changed, 679 insertions, 0 deletions
diff --git a/target/linux/mediatek/patches/0026-spi-mediatek-Add-spi-bus-for-Mediatek-MT8173.patch b/target/linux/mediatek/patches/0026-spi-mediatek-Add-spi-bus-for-Mediatek-MT8173.patch
new file mode 100644
index 0000000..3466581
--- /dev/null
+++ b/target/linux/mediatek/patches/0026-spi-mediatek-Add-spi-bus-for-Mediatek-MT8173.patch
@@ -0,0 +1,679 @@
+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
+
generated by cgit v1.1 at 2024-12-15 07:47:46 +0000