| /* |
| * 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_CFG2_REG 0x0028 |
| |
| #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_ADJUST_CFG0_CS_HOLD_OFFSET 0 |
| #define SPI_ADJUST_CFG0_CS_SETUP_OFFSET 16 |
| |
| #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_CFG2_SCK_HIGH_OFFSET 0 |
| #define SPI_CFG2_SCK_LOW_OFFSET 16 |
| |
| #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_SAMPLE_SEL BIT(6) |
| #define SPI_CMD_CS_POL BIT(7) |
| #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 32U |
| #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; |
| /* some IC design adjust cfg register to enhance time accuracy */ |
| bool enhance_timing; |
| }; |
| |
| 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; |
| u32 num_xfered; |
| 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 mtk_common_compat; |
| |
| static const struct mtk_spi_compatible mt2712_compat = { |
| .must_tx = true, |
| }; |
| |
| static const struct mtk_spi_compatible mt7622_compat = { |
| .must_tx = true, |
| .enhance_timing = true, |
| }; |
| |
| 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, |
| .cs_pol = 0, |
| .sample_sel = 0, |
| }; |
| |
| static const struct of_device_id mtk_spi_of_match[] = { |
| { .compatible = "mediatek,mt2701-spi", |
| .data = (void *)&mtk_common_compat, |
| }, |
| { .compatible = "mediatek,mt2712-spi", |
| .data = (void *)&mt2712_compat, |
| }, |
| { .compatible = "mediatek,mt6589-spi", |
| .data = (void *)&mtk_common_compat, |
| }, |
| { .compatible = "mediatek,mt7622-spi", |
| .data = (void *)&mt7622_compat, |
| }, |
| { .compatible = "mediatek,mt8135-spi", |
| .data = (void *)&mtk_common_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; |
| |
| /* 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 |
| |
| if (mdata->dev_comp->enhance_timing) { |
| if (chip_config->cs_pol) |
| reg_val |= SPI_CMD_CS_POL; |
| else |
| reg_val &= ~SPI_CMD_CS_POL; |
| if (chip_config->sample_sel) |
| reg_val |= SPI_CMD_SAMPLE_SEL; |
| else |
| reg_val &= ~SPI_CMD_SAMPLE_SEL; |
| } |
| |
| /* 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; |
| 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; |
| |
| if (mdata->dev_comp->enhance_timing) { |
| reg_val = (((sck_time - 1) & 0xffff) |
| << SPI_CFG2_SCK_HIGH_OFFSET); |
| reg_val |= (((sck_time - 1) & 0xffff) |
| << SPI_CFG2_SCK_LOW_OFFSET); |
| writel(reg_val, mdata->base + SPI_CFG2_REG); |
| reg_val = (((cs_time - 1) & 0xffff) |
| << SPI_ADJUST_CFG0_CS_HOLD_OFFSET); |
| reg_val |= (((cs_time - 1) & 0xffff) |
| << SPI_ADJUST_CFG0_CS_SETUP_OFFSET); |
| writel(reg_val, mdata->base + SPI_CFG0_REG); |
| } else { |
| 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, remainder; |
| u32 reg_val; |
| struct mtk_spi *mdata = spi_master_get_devdata(master); |
| |
| mdata->cur_transfer = xfer; |
| mdata->xfer_len = min(MTK_SPI_MAX_FIFO_SIZE, xfer->len); |
| mdata->num_xfered = 0; |
| mtk_spi_prepare_transfer(master, xfer); |
| mtk_spi_setup_packet(master); |
| |
| cnt = xfer->len / 4; |
| iowrite32_rep(mdata->base + SPI_TX_DATA_REG, xfer->tx_buf, cnt); |
| |
| remainder = xfer->len % 4; |
| if (remainder > 0) { |
| reg_val = 0; |
| memcpy(®_val, xfer->tx_buf + (cnt * 4), remainder); |
| writel(reg_val, mdata->base + SPI_TX_DATA_REG); |
| } |
| |
| 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; |
| mdata->num_xfered = 0; |
| |
| 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) |
| { |
| /* Buffers for DMA transactions must be 4-byte aligned */ |
| return (xfer->len > MTK_SPI_MAX_FIFO_SIZE && |
| (unsigned long)xfer->tx_buf % 4 == 0 && |
| (unsigned long)xfer->rx_buf % 4 == 0); |
| } |
| |
| 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, remainder, len; |
| 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) { |
| cnt = mdata->xfer_len / 4; |
| ioread32_rep(mdata->base + SPI_RX_DATA_REG, |
| trans->rx_buf + mdata->num_xfered, cnt); |
| remainder = mdata->xfer_len % 4; |
| if (remainder > 0) { |
| reg_val = readl(mdata->base + SPI_RX_DATA_REG); |
| memcpy(trans->rx_buf + |
| mdata->num_xfered + |
| (cnt * 4), |
| ®_val, |
| remainder); |
| } |
| } |
| |
| mdata->num_xfered += mdata->xfer_len; |
| if (mdata->num_xfered == trans->len) { |
| spi_finalize_current_transfer(master); |
| return IRQ_HANDLED; |
| } |
| |
| len = trans->len - mdata->num_xfered; |
| mdata->xfer_len = min(MTK_SPI_MAX_FIFO_SIZE, len); |
| mtk_spi_setup_packet(master); |
| |
| cnt = mdata->xfer_len / 4; |
| iowrite32_rep(mdata->base + SPI_TX_DATA_REG, |
| trans->tx_buf + mdata->num_xfered, cnt); |
| |
| remainder = mdata->xfer_len % 4; |
| if (remainder > 0) { |
| reg_val = 0; |
| memcpy(®_val, |
| trans->tx_buf + (cnt * 4) + mdata->num_xfered, |
| remainder); |
| writel(reg_val, mdata->base + SPI_TX_DATA_REG); |
| } |
| |
| mtk_spi_enable_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); |
| clk_disable_unprepare(mdata->spi_clk); |
| goto err_put_master; |
| } |
| |
| 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_disable_runtime_pm; |
| } |
| |
| 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_disable_runtime_pm; |
| } |
| |
| 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_disable_runtime_pm; |
| } |
| |
| 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_disable_runtime_pm; |
| } |
| } |
| } |
| } |
| |
| return 0; |
| |
| err_disable_runtime_pm: |
| pm_runtime_disable(&pdev->dev); |
| 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); |
| |
| 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"); |