// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (c) 2015 MediaTek Inc. * Author: Leilk Liu */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #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_TX_SRC_REG_64 0x002c #define SPI_RX_DST_REG_64 0x0030 #define SPI_CFG3_IPM_REG 0x0040 #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 29 #define SPI_CFG1_GET_TICK_DLY_OFFSET_V1 30 #define SPI_CFG1_GET_TICK_DLY_MASK 0xe0000000 #define SPI_CFG1_GET_TICK_DLY_MASK_V1 0xc0000000 #define SPI_CFG1_CS_IDLE_MASK 0xff #define SPI_CFG1_PACKET_LOOP_MASK 0xff00 #define SPI_CFG1_PACKET_LENGTH_MASK 0x3ff0000 #define SPI_CFG1_IPM_PACKET_LENGTH_MASK GENMASK(31, 16) #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 SPI_CMD_IPM_NONIDLE_MODE BIT(19) #define SPI_CMD_IPM_SPIM_LOOP BIT(21) #define SPI_CMD_IPM_GET_TICKDLY_OFFSET 22 #define SPI_CMD_IPM_GET_TICKDLY_MASK GENMASK(24, 22) #define PIN_MODE_CFG(x) ((x) / 2) #define SPI_CFG3_IPM_HALF_DUPLEX_DIR BIT(2) #define SPI_CFG3_IPM_HALF_DUPLEX_EN BIT(3) #define SPI_CFG3_IPM_XMODE_EN BIT(4) #define SPI_CFG3_IPM_NODATA_FLAG BIT(5) #define SPI_CFG3_IPM_CMD_BYTELEN_OFFSET 8 #define SPI_CFG3_IPM_ADDR_BYTELEN_OFFSET 12 #define SPI_CFG3_IPM_CMD_PIN_MODE_MASK GENMASK(1, 0) #define SPI_CFG3_IPM_CMD_BYTELEN_MASK GENMASK(11, 8) #define SPI_CFG3_IPM_ADDR_BYTELEN_MASK GENMASK(15, 12) #define MT8173_SPI_MAX_PAD_SEL 3 #define MTK_SPI_PAUSE_INT_STATUS 0x2 #define MTK_SPI_MAX_FIFO_SIZE 32U #define MTK_SPI_PACKET_SIZE 1024 #define MTK_SPI_IPM_PACKET_SIZE SZ_64K #define MTK_SPI_IPM_PACKET_LOOP SZ_256 #define MTK_SPI_IDLE 0 #define MTK_SPI_PAUSED 1 #define MTK_SPI_32BITS_MASK (0xffffffff) #define DMA_ADDR_EXT_BITS (36) #define DMA_ADDR_DEF_BITS (32) /** * struct mtk_spi_compatible - device data structure * @need_pad_sel: Enable pad (pins) selection in SPI controller * @must_tx: Must explicitly send dummy TX bytes to do RX only transfer * @enhance_timing: Enable adjusting cfg register to enhance time accuracy * @dma_ext: DMA address extension supported * @no_need_unprepare: Don't unprepare the SPI clk during runtime * @ipm_design: Adjust/extend registers to support IPM design IP features */ struct mtk_spi_compatible { bool need_pad_sel; bool must_tx; bool enhance_timing; bool dma_ext; bool no_need_unprepare; bool ipm_design; }; /** * struct mtk_spi - SPI driver instance * @base: Start address of the SPI controller registers * @state: SPI controller state * @pad_num: Number of pad_sel entries * @pad_sel: Groups of pins to select * @parent_clk: Parent of sel_clk * @sel_clk: SPI host mux clock * @spi_clk: Peripheral clock * @spi_hclk: AHB bus clock * @cur_transfer: Currently processed SPI transfer * @xfer_len: Number of bytes to transfer * @num_xfered: Number of transferred bytes * @tx_sgl: TX transfer scatterlist * @rx_sgl: RX transfer scatterlist * @tx_sgl_len: Size of TX DMA transfer * @rx_sgl_len: Size of RX DMA transfer * @dev_comp: Device data structure * @spi_clk_hz: Current SPI clock in Hz * @spimem_done: SPI-MEM operation completion * @use_spimem: Enables SPI-MEM * @dev: Device pointer * @tx_dma: DMA start for SPI-MEM TX * @rx_dma: DMA start for SPI-MEM RX */ struct mtk_spi { void __iomem *base; u32 state; int pad_num; u32 *pad_sel; struct clk *parent_clk, *sel_clk, *spi_clk, *spi_hclk; 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; u32 spi_clk_hz; struct completion spimem_done; bool use_spimem; struct device *dev; dma_addr_t tx_dma; dma_addr_t rx_dma; }; 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 mtk_ipm_compat = { .enhance_timing = true, .dma_ext = true, .ipm_design = true, }; static const struct mtk_spi_compatible mt6765_compat = { .need_pad_sel = true, .must_tx = true, .enhance_timing = true, .dma_ext = 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, }; static const struct mtk_spi_compatible mt8183_compat = { .need_pad_sel = true, .must_tx = true, .enhance_timing = true, }; static const struct mtk_spi_compatible mt6893_compat = { .need_pad_sel = true, .must_tx = true, .enhance_timing = true, .dma_ext = true, .no_need_unprepare = true, }; /* * A piece of default chip info unless the platform * supplies it. */ static const struct mtk_chip_config mtk_default_chip_info = { .sample_sel = 0, .tick_delay = 0, }; static const struct of_device_id mtk_spi_of_match[] = { { .compatible = "mediatek,spi-ipm", .data = (void *)&mtk_ipm_compat, }, { .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,mt6765-spi", .data = (void *)&mt6765_compat, }, { .compatible = "mediatek,mt7622-spi", .data = (void *)&mt7622_compat, }, { .compatible = "mediatek,mt7629-spi", .data = (void *)&mt7622_compat, }, { .compatible = "mediatek,mt8135-spi", .data = (void *)&mtk_common_compat, }, { .compatible = "mediatek,mt8173-spi", .data = (void *)&mt8173_compat, }, { .compatible = "mediatek,mt8183-spi", .data = (void *)&mt8183_compat, }, { .compatible = "mediatek,mt8192-spi", .data = (void *)&mt6765_compat, }, { .compatible = "mediatek,mt6893-spi", .data = (void *)&mt6893_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_set_hw_cs_timing(struct spi_device *spi) { struct mtk_spi *mdata = spi_controller_get_devdata(spi->controller); struct spi_delay *cs_setup = &spi->cs_setup; struct spi_delay *cs_hold = &spi->cs_hold; struct spi_delay *cs_inactive = &spi->cs_inactive; u32 setup, hold, inactive; u32 reg_val; int delay; delay = spi_delay_to_ns(cs_setup, NULL); if (delay < 0) return delay; setup = (delay * DIV_ROUND_UP(mdata->spi_clk_hz, 1000000)) / 1000; delay = spi_delay_to_ns(cs_hold, NULL); if (delay < 0) return delay; hold = (delay * DIV_ROUND_UP(mdata->spi_clk_hz, 1000000)) / 1000; delay = spi_delay_to_ns(cs_inactive, NULL); if (delay < 0) return delay; inactive = (delay * DIV_ROUND_UP(mdata->spi_clk_hz, 1000000)) / 1000; if (hold || setup) { reg_val = readl(mdata->base + SPI_CFG0_REG); if (mdata->dev_comp->enhance_timing) { if (hold) { hold = min_t(u32, hold, 0x10000); reg_val &= ~(0xffff << SPI_ADJUST_CFG0_CS_HOLD_OFFSET); reg_val |= (((hold - 1) & 0xffff) << SPI_ADJUST_CFG0_CS_HOLD_OFFSET); } if (setup) { setup = min_t(u32, setup, 0x10000); reg_val &= ~(0xffff << SPI_ADJUST_CFG0_CS_SETUP_OFFSET); reg_val |= (((setup - 1) & 0xffff) << SPI_ADJUST_CFG0_CS_SETUP_OFFSET); } } else { if (hold) { hold = min_t(u32, hold, 0x100); reg_val &= ~(0xff << SPI_CFG0_CS_HOLD_OFFSET); reg_val |= (((hold - 1) & 0xff) << SPI_CFG0_CS_HOLD_OFFSET); } if (setup) { setup = min_t(u32, setup, 0x100); reg_val &= ~(0xff << SPI_CFG0_CS_SETUP_OFFSET); reg_val |= (((setup - 1) & 0xff) << SPI_CFG0_CS_SETUP_OFFSET); } } writel(reg_val, mdata->base + SPI_CFG0_REG); } if (inactive) { inactive = min_t(u32, inactive, 0x100); reg_val = readl(mdata->base + SPI_CFG1_REG); reg_val &= ~SPI_CFG1_CS_IDLE_MASK; reg_val |= (((inactive - 1) & 0xff) << SPI_CFG1_CS_IDLE_OFFSET); writel(reg_val, mdata->base + SPI_CFG1_REG); } return 0; } static int mtk_spi_hw_init(struct spi_controller *host, struct spi_device *spi) { u16 cpha, cpol; u32 reg_val; struct mtk_chip_config *chip_config = spi->controller_data; struct mtk_spi *mdata = spi_controller_get_devdata(host); cpha = spi->mode & SPI_CPHA ? 1 : 0; cpol = spi->mode & SPI_CPOL ? 1 : 0; reg_val = readl(mdata->base + SPI_CMD_REG); if (mdata->dev_comp->ipm_design) { /* SPI transfer without idle time until packet length done */ reg_val |= SPI_CMD_IPM_NONIDLE_MODE; if (spi->mode & SPI_LOOP) reg_val |= SPI_CMD_IPM_SPIM_LOOP; else reg_val &= ~SPI_CMD_IPM_SPIM_LOOP; } 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 (spi->mode & SPI_LSB_FIRST) { reg_val &= ~SPI_CMD_TXMSBF; reg_val &= ~SPI_CMD_RXMSBF; } else { reg_val |= SPI_CMD_TXMSBF; 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) { /* set CS polarity */ if (spi->mode & SPI_CS_HIGH) 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_get_chipselect(spi, 0)], mdata->base + SPI_PAD_SEL_REG); /* tick delay */ if (mdata->dev_comp->enhance_timing) { if (mdata->dev_comp->ipm_design) { reg_val = readl(mdata->base + SPI_CMD_REG); reg_val &= ~SPI_CMD_IPM_GET_TICKDLY_MASK; reg_val |= ((chip_config->tick_delay & 0x7) << SPI_CMD_IPM_GET_TICKDLY_OFFSET); writel(reg_val, mdata->base + SPI_CMD_REG); } else { reg_val = readl(mdata->base + SPI_CFG1_REG); reg_val &= ~SPI_CFG1_GET_TICK_DLY_MASK; reg_val |= ((chip_config->tick_delay & 0x7) << SPI_CFG1_GET_TICK_DLY_OFFSET); writel(reg_val, mdata->base + SPI_CFG1_REG); } } else { reg_val = readl(mdata->base + SPI_CFG1_REG); reg_val &= ~SPI_CFG1_GET_TICK_DLY_MASK_V1; reg_val |= ((chip_config->tick_delay & 0x3) << SPI_CFG1_GET_TICK_DLY_OFFSET_V1); writel(reg_val, mdata->base + SPI_CFG1_REG); } /* set hw cs timing */ mtk_spi_set_hw_cs_timing(spi); return 0; } static int mtk_spi_prepare_message(struct spi_controller *host, struct spi_message *msg) { return mtk_spi_hw_init(host, msg->spi); } static void mtk_spi_set_cs(struct spi_device *spi, bool enable) { u32 reg_val; struct mtk_spi *mdata = spi_controller_get_devdata(spi->controller); if (spi->mode & SPI_CS_HIGH) enable = !enable; 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_controller *host, u32 speed_hz) { u32 div, sck_time, reg_val; struct mtk_spi *mdata = spi_controller_get_devdata(host); if (speed_hz < mdata->spi_clk_hz / 2) div = DIV_ROUND_UP(mdata->spi_clk_hz, speed_hz); else div = 1; sck_time = (div + 1) / 2; if (mdata->dev_comp->enhance_timing) { reg_val = readl(mdata->base + SPI_CFG2_REG); reg_val &= ~(0xffff << SPI_CFG2_SCK_HIGH_OFFSET); reg_val |= (((sck_time - 1) & 0xffff) << SPI_CFG2_SCK_HIGH_OFFSET); reg_val &= ~(0xffff << SPI_CFG2_SCK_LOW_OFFSET); reg_val |= (((sck_time - 1) & 0xffff) << SPI_CFG2_SCK_LOW_OFFSET); writel(reg_val, mdata->base + SPI_CFG2_REG); } else { reg_val = readl(mdata->base + SPI_CFG0_REG); reg_val &= ~(0xff << SPI_CFG0_SCK_HIGH_OFFSET); reg_val |= (((sck_time - 1) & 0xff) << SPI_CFG0_SCK_HIGH_OFFSET); reg_val &= ~(0xff << SPI_CFG0_SCK_LOW_OFFSET); reg_val |= (((sck_time - 1) & 0xff) << SPI_CFG0_SCK_LOW_OFFSET); writel(reg_val, mdata->base + SPI_CFG0_REG); } } static void mtk_spi_setup_packet(struct spi_controller *host) { u32 packet_size, packet_loop, reg_val; struct mtk_spi *mdata = spi_controller_get_devdata(host); if (mdata->dev_comp->ipm_design) packet_size = min_t(u32, mdata->xfer_len, MTK_SPI_IPM_PACKET_SIZE); else 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); if (mdata->dev_comp->ipm_design) reg_val &= ~SPI_CFG1_IPM_PACKET_LENGTH_MASK; else reg_val &= ~SPI_CFG1_PACKET_LENGTH_MASK; reg_val |= (packet_size - 1) << SPI_CFG1_PACKET_LENGTH_OFFSET; reg_val &= ~SPI_CFG1_PACKET_LOOP_MASK; 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_controller *host) { u32 cmd; struct mtk_spi *mdata = spi_controller_get_devdata(host); 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(struct mtk_spi *mdata, u32 xfer_len) { u32 mult_delta = 0; if (mdata->dev_comp->ipm_design) { if (xfer_len > MTK_SPI_IPM_PACKET_SIZE) mult_delta = xfer_len % MTK_SPI_IPM_PACKET_SIZE; } else { if (xfer_len > MTK_SPI_PACKET_SIZE) mult_delta = xfer_len % MTK_SPI_PACKET_SIZE; } return mult_delta; } static void mtk_spi_update_mdata_len(struct spi_controller *host) { int mult_delta; struct mtk_spi *mdata = spi_controller_get_devdata(host); 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, 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, 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, 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, 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_controller *host, struct spi_transfer *xfer) { struct mtk_spi *mdata = spi_controller_get_devdata(host); if (mdata->tx_sgl) { writel((u32)(xfer->tx_dma & MTK_SPI_32BITS_MASK), mdata->base + SPI_TX_SRC_REG); #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT if (mdata->dev_comp->dma_ext) writel((u32)(xfer->tx_dma >> 32), mdata->base + SPI_TX_SRC_REG_64); #endif } if (mdata->rx_sgl) { writel((u32)(xfer->rx_dma & MTK_SPI_32BITS_MASK), mdata->base + SPI_RX_DST_REG); #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT if (mdata->dev_comp->dma_ext) writel((u32)(xfer->rx_dma >> 32), mdata->base + SPI_RX_DST_REG_64); #endif } } static int mtk_spi_fifo_transfer(struct spi_controller *host, struct spi_device *spi, struct spi_transfer *xfer) { int cnt, remainder; u32 reg_val; struct mtk_spi *mdata = spi_controller_get_devdata(host); mdata->cur_transfer = xfer; mdata->xfer_len = min(MTK_SPI_MAX_FIFO_SIZE, xfer->len); mdata->num_xfered = 0; mtk_spi_prepare_transfer(host, xfer->speed_hz); mtk_spi_setup_packet(host); if (xfer->tx_buf) { 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(host); return 1; } static int mtk_spi_dma_transfer(struct spi_controller *host, struct spi_device *spi, struct spi_transfer *xfer) { int cmd; struct mtk_spi *mdata = spi_controller_get_devdata(host); 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(host, xfer->speed_hz); 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(host); mtk_spi_setup_packet(host); mtk_spi_setup_dma_addr(host, xfer); mtk_spi_enable_transfer(host); return 1; } static int mtk_spi_transfer_one(struct spi_controller *host, struct spi_device *spi, struct spi_transfer *xfer) { struct mtk_spi *mdata = spi_controller_get_devdata(spi->controller); u32 reg_val = 0; /* prepare xfer direction and duplex mode */ if (mdata->dev_comp->ipm_design) { if (!xfer->tx_buf || !xfer->rx_buf) { reg_val |= SPI_CFG3_IPM_HALF_DUPLEX_EN; if (xfer->rx_buf) reg_val |= SPI_CFG3_IPM_HALF_DUPLEX_DIR; } writel(reg_val, mdata->base + SPI_CFG3_IPM_REG); } if (host->can_dma(host, spi, xfer)) return mtk_spi_dma_transfer(host, spi, xfer); else return mtk_spi_fifo_transfer(host, spi, xfer); } static bool mtk_spi_can_dma(struct spi_controller *host, 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_controller_get_devdata(spi->controller); if (!spi->controller_data) spi->controller_data = (void *)&mtk_default_chip_info; if (mdata->dev_comp->need_pad_sel && spi_get_csgpiod(spi, 0)) /* CS de-asserted, gpiolib will handle inversion */ gpiod_direction_output(spi_get_csgpiod(spi, 0), 0); return 0; } static irqreturn_t mtk_spi_interrupt_thread(int irq, void *dev_id) { u32 cmd, reg_val, cnt, remainder, len; struct spi_controller *host = dev_id; struct mtk_spi *mdata = spi_controller_get_devdata(host); struct spi_transfer *xfer = mdata->cur_transfer; if (!host->can_dma(host, NULL, xfer)) { if (xfer->rx_buf) { cnt = mdata->xfer_len / 4; ioread32_rep(mdata->base + SPI_RX_DATA_REG, xfer->rx_buf + mdata->num_xfered, cnt); remainder = mdata->xfer_len % 4; if (remainder > 0) { reg_val = readl(mdata->base + SPI_RX_DATA_REG); memcpy(xfer->rx_buf + (cnt * 4) + mdata->num_xfered, ®_val, remainder); } } mdata->num_xfered += mdata->xfer_len; if (mdata->num_xfered == xfer->len) { spi_finalize_current_transfer(host); return IRQ_HANDLED; } len = xfer->len - mdata->num_xfered; mdata->xfer_len = min(MTK_SPI_MAX_FIFO_SIZE, len); mtk_spi_setup_packet(host); if (xfer->tx_buf) { cnt = mdata->xfer_len / 4; iowrite32_rep(mdata->base + SPI_TX_DATA_REG, xfer->tx_buf + mdata->num_xfered, cnt); remainder = mdata->xfer_len % 4; if (remainder > 0) { reg_val = 0; memcpy(®_val, xfer->tx_buf + (cnt * 4) + mdata->num_xfered, remainder); writel(reg_val, mdata->base + SPI_TX_DATA_REG); } } mtk_spi_enable_transfer(host); return IRQ_HANDLED; } if (mdata->tx_sgl) xfer->tx_dma += mdata->xfer_len; if (mdata->rx_sgl) xfer->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) { xfer->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) { xfer->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(host); return IRQ_HANDLED; } mtk_spi_update_mdata_len(host); mtk_spi_setup_packet(host); mtk_spi_setup_dma_addr(host, xfer); mtk_spi_enable_transfer(host); return IRQ_HANDLED; } static irqreturn_t mtk_spi_interrupt(int irq, void *dev_id) { struct spi_controller *host = dev_id; struct mtk_spi *mdata = spi_controller_get_devdata(host); u32 reg_val; 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; /* SPI-MEM ops */ if (mdata->use_spimem) { complete(&mdata->spimem_done); return IRQ_HANDLED; } return IRQ_WAKE_THREAD; } static int mtk_spi_mem_adjust_op_size(struct spi_mem *mem, struct spi_mem_op *op) { int opcode_len; if (op->data.dir != SPI_MEM_NO_DATA) { opcode_len = 1 + op->addr.nbytes + op->dummy.nbytes; if (opcode_len + op->data.nbytes > MTK_SPI_IPM_PACKET_SIZE) { op->data.nbytes = MTK_SPI_IPM_PACKET_SIZE - opcode_len; /* force data buffer dma-aligned. */ op->data.nbytes -= op->data.nbytes % 4; } } return 0; } static bool mtk_spi_mem_supports_op(struct spi_mem *mem, const struct spi_mem_op *op) { if (!spi_mem_default_supports_op(mem, op)) return false; if (op->addr.nbytes && op->dummy.nbytes && op->addr.buswidth != op->dummy.buswidth) return false; if (op->addr.nbytes + op->dummy.nbytes > 16) return false; if (op->data.nbytes > MTK_SPI_IPM_PACKET_SIZE) { if (op->data.nbytes / MTK_SPI_IPM_PACKET_SIZE > MTK_SPI_IPM_PACKET_LOOP || op->data.nbytes % MTK_SPI_IPM_PACKET_SIZE != 0) return false; } return true; } static void mtk_spi_mem_setup_dma_xfer(struct spi_controller *host, const struct spi_mem_op *op) { struct mtk_spi *mdata = spi_controller_get_devdata(host); writel((u32)(mdata->tx_dma & MTK_SPI_32BITS_MASK), mdata->base + SPI_TX_SRC_REG); #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT if (mdata->dev_comp->dma_ext) writel((u32)(mdata->tx_dma >> 32), mdata->base + SPI_TX_SRC_REG_64); #endif if (op->data.dir == SPI_MEM_DATA_IN) { writel((u32)(mdata->rx_dma & MTK_SPI_32BITS_MASK), mdata->base + SPI_RX_DST_REG); #ifdef CONFIG_ARCH_DMA_ADDR_T_64BIT if (mdata->dev_comp->dma_ext) writel((u32)(mdata->rx_dma >> 32), mdata->base + SPI_RX_DST_REG_64); #endif } } static int mtk_spi_transfer_wait(struct spi_mem *mem, const struct spi_mem_op *op) { struct mtk_spi *mdata = spi_controller_get_devdata(mem->spi->controller); /* * For each byte we wait for 8 cycles of the SPI clock. * Since speed is defined in Hz and we want milliseconds, * so it should be 8 * 1000. */ u64 ms = 8000LL; if (op->data.dir == SPI_MEM_NO_DATA) ms *= 32; /* prevent we may get 0 for short transfers. */ else ms *= op->data.nbytes; ms = div_u64(ms, mem->spi->max_speed_hz); ms += ms + 1000; /* 1s tolerance */ if (ms > UINT_MAX) ms = UINT_MAX; if (!wait_for_completion_timeout(&mdata->spimem_done, msecs_to_jiffies(ms))) { dev_err(mdata->dev, "spi-mem transfer timeout\n"); return -ETIMEDOUT; } return 0; } static int mtk_spi_mem_exec_op(struct spi_mem *mem, const struct spi_mem_op *op) { struct mtk_spi *mdata = spi_controller_get_devdata(mem->spi->controller); u32 reg_val, nio, tx_size; char *tx_tmp_buf, *rx_tmp_buf; int ret = 0; mdata->use_spimem = true; reinit_completion(&mdata->spimem_done); mtk_spi_reset(mdata); mtk_spi_hw_init(mem->spi->controller, mem->spi); mtk_spi_prepare_transfer(mem->spi->controller, mem->spi->max_speed_hz); reg_val = readl(mdata->base + SPI_CFG3_IPM_REG); /* opcode byte len */ reg_val &= ~SPI_CFG3_IPM_CMD_BYTELEN_MASK; reg_val |= 1 << SPI_CFG3_IPM_CMD_BYTELEN_OFFSET; /* addr & dummy byte len */ reg_val &= ~SPI_CFG3_IPM_ADDR_BYTELEN_MASK; if (op->addr.nbytes || op->dummy.nbytes) reg_val |= (op->addr.nbytes + op->dummy.nbytes) << SPI_CFG3_IPM_ADDR_BYTELEN_OFFSET; /* data byte len */ if (op->data.dir == SPI_MEM_NO_DATA) { reg_val |= SPI_CFG3_IPM_NODATA_FLAG; writel(0, mdata->base + SPI_CFG1_REG); } else { reg_val &= ~SPI_CFG3_IPM_NODATA_FLAG; mdata->xfer_len = op->data.nbytes; mtk_spi_setup_packet(mem->spi->controller); } if (op->addr.nbytes || op->dummy.nbytes) { if (op->addr.buswidth == 1 || op->dummy.buswidth == 1) reg_val |= SPI_CFG3_IPM_XMODE_EN; else reg_val &= ~SPI_CFG3_IPM_XMODE_EN; } if (op->addr.buswidth == 2 || op->dummy.buswidth == 2 || op->data.buswidth == 2) nio = 2; else if (op->addr.buswidth == 4 || op->dummy.buswidth == 4 || op->data.buswidth == 4) nio = 4; else nio = 1; reg_val &= ~SPI_CFG3_IPM_CMD_PIN_MODE_MASK; reg_val |= PIN_MODE_CFG(nio); reg_val |= SPI_CFG3_IPM_HALF_DUPLEX_EN; if (op->data.dir == SPI_MEM_DATA_IN) reg_val |= SPI_CFG3_IPM_HALF_DUPLEX_DIR; else reg_val &= ~SPI_CFG3_IPM_HALF_DUPLEX_DIR; writel(reg_val, mdata->base + SPI_CFG3_IPM_REG); tx_size = 1 + op->addr.nbytes + op->dummy.nbytes; if (op->data.dir == SPI_MEM_DATA_OUT) tx_size += op->data.nbytes; tx_size = max_t(u32, tx_size, 32); tx_tmp_buf = kzalloc(tx_size, GFP_KERNEL | GFP_DMA); if (!tx_tmp_buf) { mdata->use_spimem = false; return -ENOMEM; } tx_tmp_buf[0] = op->cmd.opcode; if (op->addr.nbytes) { int i; for (i = 0; i < op->addr.nbytes; i++) tx_tmp_buf[i + 1] = op->addr.val >> (8 * (op->addr.nbytes - i - 1)); } if (op->dummy.nbytes) memset(tx_tmp_buf + op->addr.nbytes + 1, 0xff, op->dummy.nbytes); if (op->data.nbytes && op->data.dir == SPI_MEM_DATA_OUT) memcpy(tx_tmp_buf + op->dummy.nbytes + op->addr.nbytes + 1, op->data.buf.out, op->data.nbytes); mdata->tx_dma = dma_map_single(mdata->dev, tx_tmp_buf, tx_size, DMA_TO_DEVICE); if (dma_mapping_error(mdata->dev, mdata->tx_dma)) { ret = -ENOMEM; goto err_exit; } if (op->data.dir == SPI_MEM_DATA_IN) { if (!IS_ALIGNED((size_t)op->data.buf.in, 4)) { rx_tmp_buf = kzalloc(op->data.nbytes, GFP_KERNEL | GFP_DMA); if (!rx_tmp_buf) { ret = -ENOMEM; goto unmap_tx_dma; } } else { rx_tmp_buf = op->data.buf.in; } mdata->rx_dma = dma_map_single(mdata->dev, rx_tmp_buf, op->data.nbytes, DMA_FROM_DEVICE); if (dma_mapping_error(mdata->dev, mdata->rx_dma)) { ret = -ENOMEM; goto kfree_rx_tmp_buf; } } reg_val = readl(mdata->base + SPI_CMD_REG); reg_val |= SPI_CMD_TX_DMA; if (op->data.dir == SPI_MEM_DATA_IN) reg_val |= SPI_CMD_RX_DMA; writel(reg_val, mdata->base + SPI_CMD_REG); mtk_spi_mem_setup_dma_xfer(mem->spi->controller, op); mtk_spi_enable_transfer(mem->spi->controller); /* Wait for the interrupt. */ ret = mtk_spi_transfer_wait(mem, op); if (ret) goto unmap_rx_dma; /* spi disable dma */ reg_val = readl(mdata->base + SPI_CMD_REG); reg_val &= ~SPI_CMD_TX_DMA; if (op->data.dir == SPI_MEM_DATA_IN) reg_val &= ~SPI_CMD_RX_DMA; writel(reg_val, mdata->base + SPI_CMD_REG); unmap_rx_dma: if (op->data.dir == SPI_MEM_DATA_IN) { dma_unmap_single(mdata->dev, mdata->rx_dma, op->data.nbytes, DMA_FROM_DEVICE); if (!IS_ALIGNED((size_t)op->data.buf.in, 4)) memcpy(op->data.buf.in, rx_tmp_buf, op->data.nbytes); } kfree_rx_tmp_buf: if (op->data.dir == SPI_MEM_DATA_IN && !IS_ALIGNED((size_t)op->data.buf.in, 4)) kfree(rx_tmp_buf); unmap_tx_dma: dma_unmap_single(mdata->dev, mdata->tx_dma, tx_size, DMA_TO_DEVICE); err_exit: kfree(tx_tmp_buf); mdata->use_spimem = false; return ret; } static const struct spi_controller_mem_ops mtk_spi_mem_ops = { .adjust_op_size = mtk_spi_mem_adjust_op_size, .supports_op = mtk_spi_mem_supports_op, .exec_op = mtk_spi_mem_exec_op, }; static int mtk_spi_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct spi_controller *host; struct mtk_spi *mdata; int i, irq, ret, addr_bits; host = devm_spi_alloc_host(dev, sizeof(*mdata)); if (!host) return dev_err_probe(dev, -ENOMEM, "failed to alloc spi host\n"); host->auto_runtime_pm = true; host->dev.of_node = dev->of_node; host->mode_bits = SPI_CPOL | SPI_CPHA | SPI_LSB_FIRST; host->set_cs = mtk_spi_set_cs; host->prepare_message = mtk_spi_prepare_message; host->transfer_one = mtk_spi_transfer_one; host->can_dma = mtk_spi_can_dma; host->setup = mtk_spi_setup; host->set_cs_timing = mtk_spi_set_hw_cs_timing; host->use_gpio_descriptors = true; mdata = spi_controller_get_devdata(host); mdata->dev_comp = device_get_match_data(dev); if (mdata->dev_comp->enhance_timing) host->mode_bits |= SPI_CS_HIGH; if (mdata->dev_comp->must_tx) host->flags = SPI_CONTROLLER_MUST_TX; if (mdata->dev_comp->ipm_design) host->mode_bits |= SPI_LOOP | SPI_RX_DUAL | SPI_TX_DUAL | SPI_RX_QUAD | SPI_TX_QUAD; if (mdata->dev_comp->ipm_design) { mdata->dev = dev; host->mem_ops = &mtk_spi_mem_ops; init_completion(&mdata->spimem_done); } if (mdata->dev_comp->need_pad_sel) { mdata->pad_num = of_property_count_u32_elems(dev->of_node, "mediatek,pad-select"); if (mdata->pad_num < 0) return dev_err_probe(dev, -EINVAL, "No 'mediatek,pad-select' property\n"); mdata->pad_sel = devm_kmalloc_array(dev, mdata->pad_num, sizeof(u32), GFP_KERNEL); if (!mdata->pad_sel) return -ENOMEM; for (i = 0; i < mdata->pad_num; i++) { of_property_read_u32_index(dev->of_node, "mediatek,pad-select", i, &mdata->pad_sel[i]); if (mdata->pad_sel[i] > MT8173_SPI_MAX_PAD_SEL) return dev_err_probe(dev, -EINVAL, "wrong pad-sel[%d]: %u\n", i, mdata->pad_sel[i]); } } platform_set_drvdata(pdev, host); mdata->base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(mdata->base)) return PTR_ERR(mdata->base); irq = platform_get_irq(pdev, 0); if (irq < 0) return irq; if (!dev->dma_mask) dev->dma_mask = &dev->coherent_dma_mask; if (mdata->dev_comp->ipm_design) dma_set_max_seg_size(dev, SZ_16M); else dma_set_max_seg_size(dev, SZ_256K); mdata->parent_clk = devm_clk_get(dev, "parent-clk"); if (IS_ERR(mdata->parent_clk)) return dev_err_probe(dev, PTR_ERR(mdata->parent_clk), "failed to get parent-clk\n"); mdata->sel_clk = devm_clk_get(dev, "sel-clk"); if (IS_ERR(mdata->sel_clk)) return dev_err_probe(dev, PTR_ERR(mdata->sel_clk), "failed to get sel-clk\n"); mdata->spi_clk = devm_clk_get(dev, "spi-clk"); if (IS_ERR(mdata->spi_clk)) return dev_err_probe(dev, PTR_ERR(mdata->spi_clk), "failed to get spi-clk\n"); mdata->spi_hclk = devm_clk_get_optional(dev, "hclk"); if (IS_ERR(mdata->spi_hclk)) return dev_err_probe(dev, PTR_ERR(mdata->spi_hclk), "failed to get hclk\n"); ret = clk_set_parent(mdata->sel_clk, mdata->parent_clk); if (ret < 0) return dev_err_probe(dev, ret, "failed to clk_set_parent\n"); ret = clk_prepare_enable(mdata->spi_hclk); if (ret < 0) return dev_err_probe(dev, ret, "failed to enable hclk\n"); ret = clk_prepare_enable(mdata->spi_clk); if (ret < 0) { clk_disable_unprepare(mdata->spi_hclk); return dev_err_probe(dev, ret, "failed to enable spi_clk\n"); } mdata->spi_clk_hz = clk_get_rate(mdata->spi_clk); if (mdata->dev_comp->no_need_unprepare) { clk_disable(mdata->spi_clk); clk_disable(mdata->spi_hclk); } else { clk_disable_unprepare(mdata->spi_clk); clk_disable_unprepare(mdata->spi_hclk); } if (mdata->dev_comp->need_pad_sel) { if (mdata->pad_num != host->num_chipselect) return dev_err_probe(dev, -EINVAL, "pad_num does not match num_chipselect(%d != %d)\n", mdata->pad_num, host->num_chipselect); if (!host->cs_gpiods && host->num_chipselect > 1) return dev_err_probe(dev, -EINVAL, "cs_gpios not specified and num_chipselect > 1\n"); } if (mdata->dev_comp->dma_ext) addr_bits = DMA_ADDR_EXT_BITS; else addr_bits = DMA_ADDR_DEF_BITS; ret = dma_set_mask(dev, DMA_BIT_MASK(addr_bits)); if (ret) dev_notice(dev, "SPI dma_set_mask(%d) failed, ret:%d\n", addr_bits, ret); ret = devm_request_threaded_irq(dev, irq, mtk_spi_interrupt, mtk_spi_interrupt_thread, IRQF_TRIGGER_NONE, dev_name(dev), host); if (ret) return dev_err_probe(dev, ret, "failed to register irq\n"); pm_runtime_enable(dev); ret = devm_spi_register_controller(dev, host); if (ret) { pm_runtime_disable(dev); return dev_err_probe(dev, ret, "failed to register host\n"); } return 0; } static void mtk_spi_remove(struct platform_device *pdev) { struct spi_controller *host = platform_get_drvdata(pdev); struct mtk_spi *mdata = spi_controller_get_devdata(host); int ret; if (mdata->use_spimem && !completion_done(&mdata->spimem_done)) complete(&mdata->spimem_done); ret = pm_runtime_get_sync(&pdev->dev); if (ret < 0) { dev_warn(&pdev->dev, "Failed to resume hardware (%pe)\n", ERR_PTR(ret)); } else { /* * If pm runtime resume failed, clks are disabled and * unprepared. So don't access the hardware and skip clk * unpreparing. */ mtk_spi_reset(mdata); if (mdata->dev_comp->no_need_unprepare) { clk_unprepare(mdata->spi_clk); clk_unprepare(mdata->spi_hclk); } } pm_runtime_put_noidle(&pdev->dev); pm_runtime_disable(&pdev->dev); } #ifdef CONFIG_PM_SLEEP static int mtk_spi_suspend(struct device *dev) { int ret; struct spi_controller *host = dev_get_drvdata(dev); struct mtk_spi *mdata = spi_controller_get_devdata(host); ret = spi_controller_suspend(host); if (ret) return ret; if (!pm_runtime_suspended(dev)) { clk_disable_unprepare(mdata->spi_clk); clk_disable_unprepare(mdata->spi_hclk); } pinctrl_pm_select_sleep_state(dev); return 0; } static int mtk_spi_resume(struct device *dev) { int ret; struct spi_controller *host = dev_get_drvdata(dev); struct mtk_spi *mdata = spi_controller_get_devdata(host); pinctrl_pm_select_default_state(dev); 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 = clk_prepare_enable(mdata->spi_hclk); if (ret < 0) { dev_err(dev, "failed to enable spi_hclk (%d)\n", ret); clk_disable_unprepare(mdata->spi_clk); return ret; } } ret = spi_controller_resume(host); if (ret < 0) { clk_disable_unprepare(mdata->spi_clk); clk_disable_unprepare(mdata->spi_hclk); } return ret; } #endif /* CONFIG_PM_SLEEP */ #ifdef CONFIG_PM static int mtk_spi_runtime_suspend(struct device *dev) { struct spi_controller *host = dev_get_drvdata(dev); struct mtk_spi *mdata = spi_controller_get_devdata(host); if (mdata->dev_comp->no_need_unprepare) { clk_disable(mdata->spi_clk); clk_disable(mdata->spi_hclk); } else { clk_disable_unprepare(mdata->spi_clk); clk_disable_unprepare(mdata->spi_hclk); } return 0; } static int mtk_spi_runtime_resume(struct device *dev) { struct spi_controller *host = dev_get_drvdata(dev); struct mtk_spi *mdata = spi_controller_get_devdata(host); int ret; if (mdata->dev_comp->no_need_unprepare) { ret = clk_enable(mdata->spi_clk); if (ret < 0) { dev_err(dev, "failed to enable spi_clk (%d)\n", ret); return ret; } ret = clk_enable(mdata->spi_hclk); if (ret < 0) { dev_err(dev, "failed to enable spi_hclk (%d)\n", ret); clk_disable(mdata->spi_clk); return ret; } } else { ret = clk_prepare_enable(mdata->spi_clk); if (ret < 0) { dev_err(dev, "failed to prepare_enable spi_clk (%d)\n", ret); return ret; } ret = clk_prepare_enable(mdata->spi_hclk); if (ret < 0) { dev_err(dev, "failed to prepare_enable spi_hclk (%d)\n", ret); clk_disable_unprepare(mdata->spi_clk); 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 "); MODULE_LICENSE("GPL v2"); MODULE_ALIAS("platform:mtk-spi");