/* * Copyright (C) 2009 Samsung Electronics Ltd. * Jaswinder Singh * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define MAX_SPI_PORTS 7 /* Registers and bit-fields */ #define S3C64XX_SPI_CH_CFG 0x00 #define S3C64XX_SPI_CLK_CFG 0x04 #define S3C64XX_SPI_MODE_CFG 0x08 #define S3C64XX_SPI_SLAVE_SEL 0x0C #define S3C64XX_SPI_INT_EN 0x10 #define S3C64XX_SPI_STATUS 0x14 #define S3C64XX_SPI_TX_DATA 0x18 #define S3C64XX_SPI_RX_DATA 0x1C #define S3C64XX_SPI_PACKET_CNT 0x20 #define S3C64XX_SPI_PENDING_CLR 0x24 #define S3C64XX_SPI_SWAP_CFG 0x28 #define S3C64XX_SPI_FB_CLK 0x2C #define S3C64XX_SPI_CH_HS_EN (1<<6) /* High Speed Enable */ #define S3C64XX_SPI_CH_SW_RST (1<<5) #define S3C64XX_SPI_CH_SLAVE (1<<4) #define S3C64XX_SPI_CPOL_L (1<<3) #define S3C64XX_SPI_CPHA_B (1<<2) #define S3C64XX_SPI_CH_RXCH_ON (1<<1) #define S3C64XX_SPI_CH_TXCH_ON (1<<0) #define S3C64XX_SPI_CLKSEL_SRCMSK (3<<9) #define S3C64XX_SPI_CLKSEL_SRCSHFT 9 #define S3C64XX_SPI_ENCLK_ENABLE (1<<8) #define S3C64XX_SPI_PSR_MASK 0xff #define S3C64XX_SPI_MODE_CH_TSZ_BYTE (0<<29) #define S3C64XX_SPI_MODE_CH_TSZ_HALFWORD (1<<29) #define S3C64XX_SPI_MODE_CH_TSZ_WORD (2<<29) #define S3C64XX_SPI_MODE_CH_TSZ_MASK (3<<29) #define S3C64XX_SPI_MODE_BUS_TSZ_BYTE (0<<17) #define S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD (1<<17) #define S3C64XX_SPI_MODE_BUS_TSZ_WORD (2<<17) #define S3C64XX_SPI_MODE_BUS_TSZ_MASK (3<<17) #define S3C64XX_SPI_MODE_RXDMA_ON (1<<2) #define S3C64XX_SPI_MODE_TXDMA_ON (1<<1) #define S3C64XX_SPI_MODE_4BURST (1<<0) #define S3C64XX_SPI_SLAVE_NSC_CNT_2 (2<<4) #define S3C64XX_SPI_SLAVE_NSC_CNT_1 (1<<4) #define S3C64XX_SPI_SLAVE_AUTO (1<<1) #define S3C64XX_SPI_SLAVE_SIG_INACT (1<<0) #define S3C64XX_SPI_INT_TRAILING_EN (1<<6) #define S3C64XX_SPI_INT_RX_OVERRUN_EN (1<<5) #define S3C64XX_SPI_INT_RX_UNDERRUN_EN (1<<4) #define S3C64XX_SPI_INT_TX_OVERRUN_EN (1<<3) #define S3C64XX_SPI_INT_TX_UNDERRUN_EN (1<<2) #define S3C64XX_SPI_INT_RX_FIFORDY_EN (1<<1) #define S3C64XX_SPI_INT_TX_FIFORDY_EN (1<<0) #define S3C64XX_SPI_ST_RX_OVERRUN_ERR (1<<5) #define S3C64XX_SPI_ST_RX_UNDERRUN_ERR (1<<4) #define S3C64XX_SPI_ST_TX_OVERRUN_ERR (1<<3) #define S3C64XX_SPI_ST_TX_UNDERRUN_ERR (1<<2) #define S3C64XX_SPI_ST_RX_FIFORDY (1<<1) #define S3C64XX_SPI_ST_TX_FIFORDY (1<<0) #define S3C64XX_SPI_PACKET_CNT_EN (1<<16) #define S3C64XX_SPI_PND_TX_UNDERRUN_CLR (1<<4) #define S3C64XX_SPI_PND_TX_OVERRUN_CLR (1<<3) #define S3C64XX_SPI_PND_RX_UNDERRUN_CLR (1<<2) #define S3C64XX_SPI_PND_RX_OVERRUN_CLR (1<<1) #define S3C64XX_SPI_PND_TRAILING_CLR (1<<0) #define S3C64XX_SPI_SWAP_RX_HALF_WORD (1<<7) #define S3C64XX_SPI_SWAP_RX_BYTE (1<<6) #define S3C64XX_SPI_SWAP_RX_BIT (1<<5) #define S3C64XX_SPI_SWAP_RX_EN (1<<4) #define S3C64XX_SPI_SWAP_TX_HALF_WORD (1<<3) #define S3C64XX_SPI_SWAP_TX_BYTE (1<<2) #define S3C64XX_SPI_SWAP_TX_BIT (1<<1) #define S3C64XX_SPI_SWAP_TX_EN (1<<0) #define S3C64XX_SPI_FBCLK_MSK (3<<0) #define FIFO_LVL_MASK(i) ((i)->port_conf->fifo_lvl_mask[i->port_id]) #define S3C64XX_SPI_ST_TX_DONE(v, i) (((v) & \ (1 << (i)->port_conf->tx_st_done)) ? 1 : 0) #define TX_FIFO_LVL(v, i) (((v) >> 6) & FIFO_LVL_MASK(i)) #define RX_FIFO_LVL(v, i) (((v) >> (i)->port_conf->rx_lvl_offset) & \ FIFO_LVL_MASK(i)) #define S3C64XX_SPI_MAX_TRAILCNT 0x3ff #define S3C64XX_SPI_TRAILCNT_OFF 19 #define S3C64XX_SPI_TRAILCNT S3C64XX_SPI_MAX_TRAILCNT #define msecs_to_loops(t) (loops_per_jiffy / 1000 * HZ * (t)) #define RXBUSY (1<<2) #define TXBUSY (1<<3) #define SPI_AUTOSUSPEND_TIMEOUT 100 /* ms */ /** * struct s3c64xx_spi_info - SPI Controller hardware info * @fifo_lvl_mask: Bit-mask for {TX|RX}_FIFO_LVL bits in SPI_STATUS register. * @rx_lvl_offset: Bit offset of RX_FIFO_LVL bits in SPI_STATUS regiter. * @tx_st_done: Bit offset of TX_DONE bit in SPI_STATUS regiter. * @high_speed: True, if the controller supports HIGH_SPEED_EN bit. * @clk_from_cmu: True, if the controller does not include a clock mux and * prescaler unit. * * The Samsung s3c64xx SPI controller are used on various Samsung SoC's but * differ in some aspects such as the size of the fifo and spi bus clock * setup. Such differences are specified to the driver using this structure * which is provided as driver data to the driver. */ struct s3c64xx_spi_port_config { int fifo_lvl_mask[MAX_SPI_PORTS]; int rx_lvl_offset; int tx_st_done; bool high_speed; bool clk_from_cmu; }; static void flush_fifo(struct s3c64xx_spi_driver_data *sdd) { void __iomem *regs = sdd->regs; unsigned long loops; u32 val; writel(0, regs + S3C64XX_SPI_PACKET_CNT); val = readl(regs + S3C64XX_SPI_CH_CFG); val &= ~(S3C64XX_SPI_CH_RXCH_ON | S3C64XX_SPI_CH_TXCH_ON); writel(val, regs + S3C64XX_SPI_CH_CFG); val = readl(regs + S3C64XX_SPI_CH_CFG); val |= S3C64XX_SPI_CH_SW_RST; val &= ~S3C64XX_SPI_CH_HS_EN; writel(val, regs + S3C64XX_SPI_CH_CFG); /* Flush TxFIFO*/ loops = msecs_to_loops(1); do { val = readl(regs + S3C64XX_SPI_STATUS); } while (TX_FIFO_LVL(val, sdd) && loops--); if (loops == 0) dev_warn(&sdd->pdev->dev, "Timed out flushing TX FIFO\n"); /* Flush RxFIFO*/ loops = msecs_to_loops(1); do { val = readl(regs + S3C64XX_SPI_STATUS); if (RX_FIFO_LVL(val, sdd)) readl(regs + S3C64XX_SPI_RX_DATA); else break; } while (loops--); if (loops == 0) dev_warn(&sdd->pdev->dev, "Timed out flushing RX FIFO\n"); val = readl(regs + S3C64XX_SPI_CH_CFG); val &= ~S3C64XX_SPI_CH_SW_RST; writel(val, regs + S3C64XX_SPI_CH_CFG); val = readl(regs + S3C64XX_SPI_MODE_CFG); val &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON); writel(val, regs + S3C64XX_SPI_MODE_CFG); } static void s3c64xx_spi_dmacb(void *data) { struct s3c64xx_spi_driver_data *sdd; struct s3c64xx_spi_dma_data *dma = data; unsigned long flags; if (dma->direction == DMA_DEV_TO_MEM) sdd = container_of(data, struct s3c64xx_spi_driver_data, rx_dma); else sdd = container_of(data, struct s3c64xx_spi_driver_data, tx_dma); spin_lock_irqsave(&sdd->lock, flags); if (dma->direction == DMA_DEV_TO_MEM) { sdd->state &= ~RXBUSY; if (!(sdd->state & TXBUSY)) complete(&sdd->xfer_completion); } else { sdd->state &= ~TXBUSY; if (!(sdd->state & RXBUSY)) complete(&sdd->xfer_completion); } spin_unlock_irqrestore(&sdd->lock, flags); } static void prepare_dma(struct s3c64xx_spi_dma_data *dma, unsigned len, dma_addr_t buf) { struct s3c64xx_spi_driver_data *sdd; struct dma_slave_config config; struct scatterlist sg; struct dma_async_tx_descriptor *desc; if (dma->direction == DMA_DEV_TO_MEM) { sdd = container_of((void *)dma, struct s3c64xx_spi_driver_data, rx_dma); config.direction = dma->direction; config.src_addr = sdd->sfr_start + S3C64XX_SPI_RX_DATA; config.src_addr_width = sdd->cur_bpw / 8; config.src_maxburst = 1; dmaengine_slave_config(dma->ch, &config); } else { sdd = container_of((void *)dma, struct s3c64xx_spi_driver_data, tx_dma); config.direction = dma->direction; config.dst_addr = sdd->sfr_start + S3C64XX_SPI_TX_DATA; config.dst_addr_width = sdd->cur_bpw / 8; config.dst_maxburst = 1; dmaengine_slave_config(dma->ch, &config); } sg_init_table(&sg, 1); sg_dma_len(&sg) = len; sg_set_page(&sg, pfn_to_page(PFN_DOWN(buf)), len, offset_in_page(buf)); sg_dma_address(&sg) = buf; desc = dmaengine_prep_slave_sg(dma->ch, &sg, 1, dma->direction, DMA_PREP_INTERRUPT); desc->callback = s3c64xx_spi_dmacb; desc->callback_param = dma; dmaengine_submit(desc); dma_async_issue_pending(dma->ch); } static int s3c64xx_spi_prepare_transfer(struct spi_master *spi) { struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi); struct s3c64xx_spi_info *sci = sdd->cntrlr_info; dma_filter_fn filter = sdd->cntrlr_info->filter; struct device *dev = &sdd->pdev->dev; dma_cap_mask_t mask; int ret; if (sci->dma_mode != DMA_MODE) { pm_runtime_get_sync(&sdd->pdev->dev); return 0; } dma_cap_zero(mask); dma_cap_set(DMA_SLAVE, mask); /* Acquire DMA channels */ sdd->rx_dma.ch = dma_request_slave_channel_compat(mask, filter, (void*)(long)sdd->rx_dma.dmach, dev, "rx"); if (!sdd->rx_dma.ch) { dev_err(dev, "Failed to get RX DMA channel\n"); ret = -EBUSY; goto out; } sdd->tx_dma.ch = dma_request_slave_channel_compat(mask, filter, (void*)(long)sdd->tx_dma.dmach, dev, "tx"); if (!sdd->tx_dma.ch) { dev_err(dev, "Failed to get TX DMA channel\n"); ret = -EBUSY; goto out_rx; } ret = pm_runtime_get_sync(&sdd->pdev->dev); if (ret < 0) { dev_err(dev, "Failed to enable device: %d\n", ret); goto out_tx; } return 0; out_tx: dma_release_channel(sdd->tx_dma.ch); out_rx: dma_release_channel(sdd->rx_dma.ch); out: return ret; } static int s3c64xx_spi_unprepare_transfer(struct spi_master *spi) { struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(spi); struct s3c64xx_spi_info *sci = sdd->cntrlr_info; if (sci->dma_mode == DMA_MODE) { /* Free DMA channels */ dma_release_channel(sdd->rx_dma.ch); dma_release_channel(sdd->tx_dma.ch); } pm_runtime_mark_last_busy(&sdd->pdev->dev); pm_runtime_put_autosuspend(&sdd->pdev->dev); return 0; } static void s3c64xx_spi_dma_stop(struct s3c64xx_spi_driver_data *sdd, struct s3c64xx_spi_dma_data *dma) { dmaengine_terminate_all(dma->ch); } static void enable_datapath(struct s3c64xx_spi_driver_data *sdd, struct spi_device *spi, struct spi_transfer *xfer, int dma_mode) { void __iomem *regs = sdd->regs; u32 modecfg, chcfg; modecfg = readl(regs + S3C64XX_SPI_MODE_CFG); modecfg &= ~(S3C64XX_SPI_MODE_TXDMA_ON | S3C64XX_SPI_MODE_RXDMA_ON); chcfg = readl(regs + S3C64XX_SPI_CH_CFG); chcfg &= ~S3C64XX_SPI_CH_TXCH_ON; if (dma_mode) { chcfg &= ~S3C64XX_SPI_CH_RXCH_ON; } else { /* Always shift in data in FIFO, even if xfer is Tx only, * this helps setting PCKT_CNT value for generating clocks * as exactly needed. */ chcfg |= S3C64XX_SPI_CH_RXCH_ON; writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff) | S3C64XX_SPI_PACKET_CNT_EN, regs + S3C64XX_SPI_PACKET_CNT); } if (xfer->tx_buf != NULL) { sdd->state |= TXBUSY; chcfg |= S3C64XX_SPI_CH_TXCH_ON; if (dma_mode) { modecfg |= S3C64XX_SPI_MODE_TXDMA_ON; prepare_dma(&sdd->tx_dma, xfer->len, xfer->tx_dma); } else { switch (sdd->cur_bpw) { case 32: iowrite32_rep(regs + S3C64XX_SPI_TX_DATA, xfer->tx_buf, xfer->len / 4); break; case 16: iowrite16_rep(regs + S3C64XX_SPI_TX_DATA, xfer->tx_buf, xfer->len / 2); break; default: iowrite8_rep(regs + S3C64XX_SPI_TX_DATA, xfer->tx_buf, xfer->len); break; } } } if (xfer->rx_buf != NULL) { sdd->state |= RXBUSY; if (sdd->port_conf->high_speed && sdd->cur_speed >= 30000000UL && !(sdd->cur_mode & SPI_CPHA)) chcfg |= S3C64XX_SPI_CH_HS_EN; if (dma_mode) { modecfg |= S3C64XX_SPI_MODE_RXDMA_ON; chcfg |= S3C64XX_SPI_CH_RXCH_ON; writel(((xfer->len * 8 / sdd->cur_bpw) & 0xffff) | S3C64XX_SPI_PACKET_CNT_EN, regs + S3C64XX_SPI_PACKET_CNT); prepare_dma(&sdd->rx_dma, xfer->len, xfer->rx_dma); } } writel(modecfg, regs + S3C64XX_SPI_MODE_CFG); writel(chcfg, regs + S3C64XX_SPI_CH_CFG); } static inline void enable_cs(struct s3c64xx_spi_driver_data *sdd, struct spi_device *spi) { struct s3c64xx_spi_csinfo *cs; if (sdd->tgl_spi != NULL) { /* If last device toggled after mssg */ if (sdd->tgl_spi != spi) { /* if last mssg on diff device */ /* Deselect the last toggled device */ cs = sdd->tgl_spi->controller_data; gpio_set_value(cs->line, spi->mode & SPI_CS_HIGH ? 0 : 1); /* Quiese the signals */ writel(spi->mode & SPI_CS_HIGH ? 0 : S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL); } sdd->tgl_spi = NULL; } cs = spi->controller_data; gpio_set_value(cs->line, spi->mode & SPI_CS_HIGH ? 1 : 0); /* Start the signals */ writel(spi->mode & SPI_CS_HIGH ? S3C64XX_SPI_SLAVE_SIG_INACT : 0, sdd->regs + S3C64XX_SPI_SLAVE_SEL); } static int wait_for_xfer(struct s3c64xx_spi_driver_data *sdd, struct spi_transfer *xfer, int dma_mode) { void __iomem *regs = sdd->regs; unsigned long val; int ms; /* millisecs to xfer 'len' bytes @ 'cur_speed' */ ms = xfer->len * 8 * 1000 / sdd->cur_speed; ms += 10; /* some tolerance */ if (dma_mode) { val = msecs_to_jiffies(ms) + 10; val = wait_for_completion_timeout(&sdd->xfer_completion, val); } else { u32 status; val = msecs_to_loops(ms); do { status = readl(regs + S3C64XX_SPI_STATUS); } while (RX_FIFO_LVL(status, sdd) < xfer->len && --val); } if (!val) return -EIO; if (dma_mode) { u32 status; /* * DmaTx returns after simply writing data in the FIFO, * w/o waiting for real transmission on the bus to finish. * DmaRx returns only after Dma read data from FIFO which * needs bus transmission to finish, so we don't worry if * Xfer involved Rx(with or without Tx). */ if (xfer->rx_buf == NULL) { val = msecs_to_loops(10); status = readl(regs + S3C64XX_SPI_STATUS); while ((TX_FIFO_LVL(status, sdd) || !S3C64XX_SPI_ST_TX_DONE(status, sdd)) && --val) { cpu_relax(); status = readl(regs + S3C64XX_SPI_STATUS); } if (!val) return -EIO; } } else { /* If it was only Tx */ if (xfer->rx_buf == NULL) { sdd->state &= ~TXBUSY; return 0; } switch (sdd->cur_bpw) { case 32: ioread32_rep(regs + S3C64XX_SPI_RX_DATA, xfer->rx_buf, xfer->len / 4); break; case 16: ioread16_rep(regs + S3C64XX_SPI_RX_DATA, xfer->rx_buf, xfer->len / 2); break; default: ioread8_rep(regs + S3C64XX_SPI_RX_DATA, xfer->rx_buf, xfer->len); break; } sdd->state &= ~RXBUSY; } return 0; } static inline void disable_cs(struct s3c64xx_spi_driver_data *sdd, struct spi_device *spi) { struct s3c64xx_spi_csinfo *cs = spi->controller_data; if (sdd->tgl_spi == spi) sdd->tgl_spi = NULL; gpio_set_value(cs->line, spi->mode & SPI_CS_HIGH ? 0 : 1); /* Quiese the signals */ writel(spi->mode & SPI_CS_HIGH ? 0 : S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL); } static void s3c64xx_spi_config(struct s3c64xx_spi_driver_data *sdd) { struct s3c64xx_spi_info *sci = sdd->cntrlr_info; void __iomem *regs = sdd->regs; u32 val; /* Disable Clock */ if (sdd->port_conf->clk_from_cmu) { clk_disable_unprepare(sdd->src_clk); } else { val = readl(regs + S3C64XX_SPI_CLK_CFG); val &= ~S3C64XX_SPI_ENCLK_ENABLE; writel(val, regs + S3C64XX_SPI_CLK_CFG); } /* Set Polarity and Phase */ val = readl(regs + S3C64XX_SPI_CH_CFG); val &= ~(S3C64XX_SPI_CH_SLAVE | S3C64XX_SPI_CPOL_L | S3C64XX_SPI_CPHA_B); if (sdd->cur_mode & SPI_CPOL) val |= S3C64XX_SPI_CPOL_L; if (sdd->cur_mode & SPI_CPHA) val |= S3C64XX_SPI_CPHA_B; writel(val, regs + S3C64XX_SPI_CH_CFG); /* Set Channel & DMA Mode */ val = readl(regs + S3C64XX_SPI_MODE_CFG); val &= ~(S3C64XX_SPI_MODE_BUS_TSZ_MASK | S3C64XX_SPI_MODE_CH_TSZ_MASK); switch (sdd->cur_bpw) { case 32: val |= S3C64XX_SPI_MODE_BUS_TSZ_WORD; val |= S3C64XX_SPI_MODE_CH_TSZ_WORD; if (sci->swap_mode == SWAP_MODE) { writel(S3C64XX_SPI_SWAP_TX_EN | S3C64XX_SPI_SWAP_TX_BYTE | S3C64XX_SPI_SWAP_TX_HALF_WORD | S3C64XX_SPI_SWAP_RX_EN | S3C64XX_SPI_SWAP_RX_BYTE | S3C64XX_SPI_SWAP_RX_HALF_WORD, regs + S3C64XX_SPI_SWAP_CFG); } break; case 16: val |= S3C64XX_SPI_MODE_BUS_TSZ_HALFWORD; val |= S3C64XX_SPI_MODE_CH_TSZ_HALFWORD; if (sci->swap_mode == SWAP_MODE) { writel(S3C64XX_SPI_SWAP_TX_EN | S3C64XX_SPI_SWAP_TX_BYTE | S3C64XX_SPI_SWAP_RX_EN | S3C64XX_SPI_SWAP_RX_BYTE, regs + S3C64XX_SPI_SWAP_CFG); } break; default: val |= S3C64XX_SPI_MODE_BUS_TSZ_BYTE; val |= S3C64XX_SPI_MODE_CH_TSZ_BYTE; if (sci->swap_mode == SWAP_MODE) writel(0, regs + S3C64XX_SPI_SWAP_CFG); break; } writel(val, regs + S3C64XX_SPI_MODE_CFG); if (sdd->port_conf->clk_from_cmu) { /* Configure Clock */ /* There is half-multiplier before the SPI */ clk_set_rate(sdd->src_clk, sdd->cur_speed * 2); /* Enable Clock */ clk_prepare_enable(sdd->src_clk); } else { /* Configure Clock */ val = readl(regs + S3C64XX_SPI_CLK_CFG); val &= ~S3C64XX_SPI_PSR_MASK; val |= ((clk_get_rate(sdd->src_clk) / sdd->cur_speed / 2 - 1) & S3C64XX_SPI_PSR_MASK); writel(val, regs + S3C64XX_SPI_CLK_CFG); /* Enable Clock */ val = readl(regs + S3C64XX_SPI_CLK_CFG); val |= S3C64XX_SPI_ENCLK_ENABLE; writel(val, regs + S3C64XX_SPI_CLK_CFG); } } #define XFER_DMAADDR_INVALID DMA_BIT_MASK(32) static int s3c64xx_spi_map_mssg(struct s3c64xx_spi_driver_data *sdd, struct spi_message *msg) { struct s3c64xx_spi_info *sci = sdd->cntrlr_info; struct device *dev = &sdd->pdev->dev; struct spi_transfer *xfer; if ((msg->is_dma_mapped) || (sci->dma_mode != DMA_MODE)) return 0; /* First mark all xfer unmapped */ list_for_each_entry(xfer, &msg->transfers, transfer_list) { xfer->rx_dma = XFER_DMAADDR_INVALID; xfer->tx_dma = XFER_DMAADDR_INVALID; } /* Map until end or first fail */ list_for_each_entry(xfer, &msg->transfers, transfer_list) { if (xfer->len <= ((FIFO_LVL_MASK(sdd) >> 1) + 1)) continue; if (xfer->tx_buf != NULL) { xfer->tx_dma = dma_map_single(dev, (void *)xfer->tx_buf, xfer->len, DMA_TO_DEVICE); if (dma_mapping_error(dev, xfer->tx_dma)) { dev_err(dev, "dma_map_single Tx failed\n"); xfer->tx_dma = XFER_DMAADDR_INVALID; return -ENOMEM; } } if (xfer->rx_buf != NULL) { xfer->rx_dma = dma_map_single(dev, xfer->rx_buf, xfer->len, DMA_FROM_DEVICE); if (dma_mapping_error(dev, xfer->rx_dma)) { dev_err(dev, "dma_map_single Rx failed\n"); dma_unmap_single(dev, xfer->tx_dma, xfer->len, DMA_TO_DEVICE); xfer->tx_dma = XFER_DMAADDR_INVALID; xfer->rx_dma = XFER_DMAADDR_INVALID; return -ENOMEM; } } } return 0; } static void s3c64xx_spi_unmap_mssg(struct s3c64xx_spi_driver_data *sdd, struct spi_message *msg) { struct s3c64xx_spi_info *sci = sdd->cntrlr_info; struct device *dev = &sdd->pdev->dev; struct spi_transfer *xfer; if ((msg->is_dma_mapped) || (sci->dma_mode != DMA_MODE)) return; list_for_each_entry(xfer, &msg->transfers, transfer_list) { if (xfer->len <= ((FIFO_LVL_MASK(sdd) >> 1) + 1)) continue; if (xfer->rx_buf != NULL && xfer->rx_dma != XFER_DMAADDR_INVALID) dma_unmap_single(dev, xfer->rx_dma, xfer->len, DMA_FROM_DEVICE); if (xfer->tx_buf != NULL && xfer->tx_dma != XFER_DMAADDR_INVALID) dma_unmap_single(dev, xfer->tx_dma, xfer->len, DMA_TO_DEVICE); } } static int s3c64xx_spi_transfer_one_message(struct spi_master *master, struct spi_message *msg) { struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); struct s3c64xx_spi_info *sci = sdd->cntrlr_info; struct spi_device *spi = msg->spi; struct s3c64xx_spi_csinfo *cs = spi->controller_data; struct spi_transfer *xfer; int status = 0, cs_toggle = 0; const void *origin_tx_buf = NULL; void *origin_rx_buf = NULL; unsigned target_len = 0, origin_len = 0; unsigned fifo_lvl = (FIFO_LVL_MASK(sdd) >> 1) + 1; u32 speed; u8 bpw; /* If Master's(controller) state differs from that needed by Slave */ if (sdd->cur_speed != spi->max_speed_hz || sdd->cur_mode != spi->mode || sdd->cur_bpw != spi->bits_per_word) { sdd->cur_bpw = spi->bits_per_word; sdd->cur_speed = spi->max_speed_hz; sdd->cur_mode = spi->mode; s3c64xx_spi_config(sdd); } /* Map all the transfers if needed */ if (s3c64xx_spi_map_mssg(sdd, msg)) { dev_err(&spi->dev, "Xfer: Unable to map message buffers!\n"); status = -ENOMEM; goto out; } /* Configure feedback delay */ writel(cs->fb_delay & 0x3, sdd->regs + S3C64XX_SPI_FB_CLK); list_for_each_entry(xfer, &msg->transfers, transfer_list) { unsigned long flags; int use_dma; reinit_completion(&sdd->xfer_completion); /* Only BPW and Speed may change across transfers */ bpw = xfer->bits_per_word; speed = xfer->speed_hz ? : spi->max_speed_hz; if (xfer->len % (bpw / 8)) { dev_err(&spi->dev, "Xfer length(%u) not a multiple of word size(%u)\n", xfer->len, bpw / 8); status = -EIO; goto out; } if (bpw != sdd->cur_bpw || speed != sdd->cur_speed) { sdd->cur_bpw = bpw; sdd->cur_speed = speed; s3c64xx_spi_config(sdd); } /* verify cpu mode */ if (sci->dma_mode != DMA_MODE) { use_dma = 0; /* backup original tx, rx buf ptr & xfer length */ origin_tx_buf = xfer->tx_buf; origin_rx_buf = xfer->rx_buf; origin_len = xfer->len; target_len = xfer->len; if (xfer->len > fifo_lvl) xfer->len = fifo_lvl; } else { /* Polling method for xfers not bigger than FIFO capacity */ if (xfer->len <= fifo_lvl) { use_dma = 0; } else { use_dma = 1; } } try_transfer: spin_lock_irqsave(&sdd->lock, flags); /* Pending only which is to be done */ sdd->state &= ~RXBUSY; sdd->state &= ~TXBUSY; enable_datapath(sdd, spi, xfer, use_dma); /* Slave Select */ enable_cs(sdd, spi); /* Start the signals */ writel(0, sdd->regs + S3C64XX_SPI_SLAVE_SEL); spin_unlock_irqrestore(&sdd->lock, flags); status = wait_for_xfer(sdd, xfer, use_dma); /* Quiese the signals */ writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL); if (status) { dev_err(&spi->dev, "I/O Error: rx-%d tx-%d res:rx-%c tx-%c len-%d\n", xfer->rx_buf ? 1 : 0, xfer->tx_buf ? 1 : 0, (sdd->state & RXBUSY) ? 'f' : 'p', (sdd->state & TXBUSY) ? 'f' : 'p', xfer->len); if (use_dma) { if (xfer->tx_buf != NULL && (sdd->state & TXBUSY)) s3c64xx_spi_dma_stop(sdd, &sdd->tx_dma); if (xfer->rx_buf != NULL && (sdd->state & RXBUSY)) s3c64xx_spi_dma_stop(sdd, &sdd->rx_dma); } goto out; } if (xfer->delay_usecs) udelay(xfer->delay_usecs); if (xfer->cs_change) { /* Hint that the next mssg is gonna be for the same device */ if (list_is_last(&xfer->transfer_list, &msg->transfers)) cs_toggle = 1; } msg->actual_length += xfer->len; flush_fifo(sdd); if (sci->dma_mode != DMA_MODE) { target_len -= xfer->len; if (xfer->tx_buf != NULL) xfer->tx_buf += xfer->len; if (xfer->rx_buf != NULL) xfer->rx_buf += xfer->len; if (target_len > 0) { if (target_len > fifo_lvl) xfer->len = fifo_lvl; else xfer->len = target_len; goto try_transfer; } /* restore original tx, rx buf_ptr & xfer length */ xfer->tx_buf = origin_tx_buf; xfer->rx_buf = origin_rx_buf; xfer->len = origin_len; } } out: if (!cs_toggle || status) disable_cs(sdd, spi); else sdd->tgl_spi = spi; s3c64xx_spi_unmap_mssg(sdd, msg); msg->status = status; spi_finalize_current_message(master); return 0; } static struct s3c64xx_spi_csinfo *s3c64xx_get_slave_ctrldata( struct spi_device *spi) { struct s3c64xx_spi_csinfo *cs; struct device_node *slave_np, *data_np = NULL; u32 fb_delay = 0; slave_np = spi->dev.of_node; if (!slave_np) { dev_err(&spi->dev, "device node not found\n"); return ERR_PTR(-EINVAL); } data_np = of_get_child_by_name(slave_np, "controller-data"); if (!data_np) { dev_err(&spi->dev, "child node 'controller-data' not found\n"); return ERR_PTR(-EINVAL); } cs = kzalloc(sizeof(*cs), GFP_KERNEL); if (!cs) { dev_err(&spi->dev, "could not allocate memory for controller data\n"); of_node_put(data_np); return ERR_PTR(-ENOMEM); } cs->line = of_get_named_gpio(data_np, "cs-gpio", 0); if (!gpio_is_valid(cs->line)) { dev_err(&spi->dev, "chip select gpio is not specified or invalid\n"); kfree(cs); of_node_put(data_np); return ERR_PTR(-EINVAL); } of_property_read_u32(data_np, "samsung,spi-feedback-delay", &fb_delay); cs->fb_delay = fb_delay; of_node_put(data_np); return cs; } /* * Here we only check the validity of requested configuration * and save the configuration in a local data-structure. * The controller is actually configured only just before we * get a message to transfer. */ static int s3c64xx_spi_setup(struct spi_device *spi) { struct s3c64xx_spi_csinfo *cs = spi->controller_data; struct s3c64xx_spi_driver_data *sdd; struct s3c64xx_spi_info *sci; struct spi_message *msg; unsigned long flags; int err; sdd = spi_master_get_devdata(spi->master); if (!cs && spi->dev.of_node) { cs = s3c64xx_get_slave_ctrldata(spi); spi->controller_data = cs; } if (IS_ERR_OR_NULL(cs)) { dev_err(&spi->dev, "No CS for SPI(%d)\n", spi->chip_select); return -ENODEV; } if (!spi_get_ctldata(spi)) { err = gpio_request_one(cs->line, GPIOF_OUT_INIT_HIGH, dev_name(&spi->dev)); if (err) { dev_err(&spi->dev, "Failed to get /CS gpio [%d]: %d\n", cs->line, err); goto err_gpio_req; } spi_set_ctldata(spi, cs); } sci = sdd->cntrlr_info; spin_lock_irqsave(&sdd->lock, flags); list_for_each_entry(msg, &sdd->queue, queue) { /* Is some mssg is already queued for this device */ if (msg->spi == spi) { dev_err(&spi->dev, "setup: attempt while mssg in queue!\n"); spin_unlock_irqrestore(&sdd->lock, flags); err = -EBUSY; goto err_msgq; } } spin_unlock_irqrestore(&sdd->lock, flags); pm_runtime_get_sync(&sdd->pdev->dev); /* Check if we can provide the requested rate */ if (!sdd->port_conf->clk_from_cmu) { u32 psr, speed; /* Max possible */ speed = clk_get_rate(sdd->src_clk) / 2 / (0 + 1); if (spi->max_speed_hz > speed) spi->max_speed_hz = speed; psr = clk_get_rate(sdd->src_clk) / 2 / spi->max_speed_hz - 1; psr &= S3C64XX_SPI_PSR_MASK; if (psr == S3C64XX_SPI_PSR_MASK) psr--; speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1); if (spi->max_speed_hz < speed) { if (psr+1 < S3C64XX_SPI_PSR_MASK) { psr++; } else { err = -EINVAL; goto setup_exit; } } speed = clk_get_rate(sdd->src_clk) / 2 / (psr + 1); if (spi->max_speed_hz >= speed) { spi->max_speed_hz = speed; } else { dev_err(&spi->dev, "Can't set %dHz transfer speed\n", spi->max_speed_hz); err = -EINVAL; goto setup_exit; } } disable_cs(sdd, spi); pm_runtime_mark_last_busy(&sdd->pdev->dev); pm_runtime_put_autosuspend(&sdd->pdev->dev); return 0; setup_exit: /* setup() returns with device de-selected */ disable_cs(sdd, spi); err_msgq: gpio_free(cs->line); spi_set_ctldata(spi, NULL); err_gpio_req: if (spi->dev.of_node) kfree(cs); return err; } static void s3c64xx_spi_cleanup(struct spi_device *spi) { struct s3c64xx_spi_csinfo *cs = spi_get_ctldata(spi); if (cs) { gpio_free(cs->line); if (spi->dev.of_node) kfree(cs); } spi_set_ctldata(spi, NULL); } static irqreturn_t s3c64xx_spi_irq(int irq, void *data) { struct s3c64xx_spi_driver_data *sdd = data; struct spi_master *spi = sdd->master; unsigned int val, clr = 0; val = readl(sdd->regs + S3C64XX_SPI_STATUS); if (val & S3C64XX_SPI_ST_RX_OVERRUN_ERR) { clr = S3C64XX_SPI_PND_RX_OVERRUN_CLR; dev_err(&spi->dev, "RX overrun\n"); } if (val & S3C64XX_SPI_ST_RX_UNDERRUN_ERR) { clr |= S3C64XX_SPI_PND_RX_UNDERRUN_CLR; dev_err(&spi->dev, "RX underrun\n"); } if (val & S3C64XX_SPI_ST_TX_OVERRUN_ERR) { clr |= S3C64XX_SPI_PND_TX_OVERRUN_CLR; dev_err(&spi->dev, "TX overrun\n"); } if (val & S3C64XX_SPI_ST_TX_UNDERRUN_ERR) { clr |= S3C64XX_SPI_PND_TX_UNDERRUN_CLR; dev_err(&spi->dev, "TX underrun\n"); } /* Clear the pending irq by setting and then clearing it */ writel(clr, sdd->regs + S3C64XX_SPI_PENDING_CLR); writel(0, sdd->regs + S3C64XX_SPI_PENDING_CLR); return IRQ_HANDLED; } static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel) { struct s3c64xx_spi_info *sci = sdd->cntrlr_info; void __iomem *regs = sdd->regs; unsigned int val; sdd->cur_speed = 0; writel(S3C64XX_SPI_SLAVE_SIG_INACT, sdd->regs + S3C64XX_SPI_SLAVE_SEL); /* Disable Interrupts - we use Polling if not DMA mode */ writel(0, regs + S3C64XX_SPI_INT_EN); if (!sdd->port_conf->clk_from_cmu) writel(sci->src_clk_nr << S3C64XX_SPI_CLKSEL_SRCSHFT, regs + S3C64XX_SPI_CLK_CFG); writel(0, regs + S3C64XX_SPI_MODE_CFG); writel(0, regs + S3C64XX_SPI_PACKET_CNT); /* Clear any irq pending bits, should set and clear the bits */ val = S3C64XX_SPI_PND_RX_OVERRUN_CLR | S3C64XX_SPI_PND_RX_UNDERRUN_CLR | S3C64XX_SPI_PND_TX_OVERRUN_CLR | S3C64XX_SPI_PND_TX_UNDERRUN_CLR; writel(val, regs + S3C64XX_SPI_PENDING_CLR); writel(0, regs + S3C64XX_SPI_PENDING_CLR); writel(0, regs + S3C64XX_SPI_SWAP_CFG); val = readl(regs + S3C64XX_SPI_MODE_CFG); val &= ~S3C64XX_SPI_MODE_4BURST; val &= ~(S3C64XX_SPI_MAX_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF); val |= (S3C64XX_SPI_TRAILCNT << S3C64XX_SPI_TRAILCNT_OFF); writel(val, regs + S3C64XX_SPI_MODE_CFG); flush_fifo(sdd); } #ifdef CONFIG_OF static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev) { struct s3c64xx_spi_info *sci; u32 temp; sci = devm_kzalloc(dev, sizeof(*sci), GFP_KERNEL); if (!sci) { dev_err(dev, "memory allocation for spi_info failed\n"); return ERR_PTR(-ENOMEM); } if (of_get_property(dev->of_node, "dma-mode", NULL)) sci->dma_mode = DMA_MODE; else sci->dma_mode = CPU_MODE; if (of_get_property(dev->of_node, "swap-mode", NULL)) sci->swap_mode = SWAP_MODE; else sci->swap_mode = NO_SWAP_MODE; if (of_property_read_u32(dev->of_node, "samsung,spi-src-clk", &temp)) { dev_warn(dev, "spi bus clock parent not specified, using clock at index 0 as parent\n"); sci->src_clk_nr = 0; } else { sci->src_clk_nr = temp; } if (of_property_read_u32(dev->of_node, "num-cs", &temp)) { dev_warn(dev, "number of chip select lines not specified, assuming 1 chip select line\n"); sci->num_cs = 1; } else { sci->num_cs = temp; } return sci; } #else static struct s3c64xx_spi_info *s3c64xx_spi_parse_dt(struct device *dev) { return dev->platform_data; } #endif static const struct of_device_id s3c64xx_spi_dt_match[]; static inline struct s3c64xx_spi_port_config *s3c64xx_spi_get_port_config( struct platform_device *pdev) { #ifdef CONFIG_OF if (pdev->dev.of_node) { const struct of_device_id *match; match = of_match_node(s3c64xx_spi_dt_match, pdev->dev.of_node); return (struct s3c64xx_spi_port_config *)match->data; } #endif return (struct s3c64xx_spi_port_config *) platform_get_device_id(pdev)->driver_data; } static int s3c64xx_spi_probe(struct platform_device *pdev) { struct resource *mem_res; struct resource *res; struct s3c64xx_spi_driver_data *sdd; struct s3c64xx_spi_info *sci = pdev->dev.platform_data; struct spi_master *master; int ret, irq; char clk_name[16]; if (!sci && pdev->dev.of_node) { sci = s3c64xx_spi_parse_dt(&pdev->dev); if (IS_ERR(sci)) return PTR_ERR(sci); } if (!sci) { dev_err(&pdev->dev, "platform_data missing!\n"); return -ENODEV; } mem_res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (mem_res == NULL) { dev_err(&pdev->dev, "Unable to get SPI MEM resource\n"); return -ENXIO; } irq = platform_get_irq(pdev, 0); if (irq < 0) { dev_warn(&pdev->dev, "Failed to get IRQ: %d\n", irq); return irq; } master = spi_alloc_master(&pdev->dev, sizeof(struct s3c64xx_spi_driver_data)); if (master == NULL) { dev_err(&pdev->dev, "Unable to allocate SPI Master\n"); return -ENOMEM; } platform_set_drvdata(pdev, master); sdd = spi_master_get_devdata(master); sdd->port_conf = s3c64xx_spi_get_port_config(pdev); sdd->master = master; sdd->cntrlr_info = sci; sdd->pdev = pdev; sdd->sfr_start = mem_res->start; if (pdev->dev.of_node) { ret = of_alias_get_id(pdev->dev.of_node, "spi"); if (ret < 0) { dev_err(&pdev->dev, "failed to get alias id, errno %d\n", ret); goto err0; } sdd->port_id = ret; } else { sdd->port_id = pdev->id; } sdd->cur_bpw = 8; if (!sdd->pdev->dev.of_node) { res = platform_get_resource(pdev, IORESOURCE_DMA, 0); if (!res) { dev_err(&pdev->dev, "Unable to get SPI tx dma " "resource\n"); return -ENXIO; } sdd->tx_dma.dmach = res->start; res = platform_get_resource(pdev, IORESOURCE_DMA, 1); if (!res) { dev_err(&pdev->dev, "Unable to get SPI rx dma " "resource\n"); return -ENXIO; } sdd->rx_dma.dmach = res->start; } sdd->tx_dma.direction = DMA_MEM_TO_DEV; sdd->rx_dma.direction = DMA_DEV_TO_MEM; master->dev.of_node = pdev->dev.of_node; master->bus_num = sdd->port_id; master->setup = s3c64xx_spi_setup; master->cleanup = s3c64xx_spi_cleanup; master->prepare_transfer_hardware = s3c64xx_spi_prepare_transfer; master->transfer_one_message = s3c64xx_spi_transfer_one_message; master->unprepare_transfer_hardware = s3c64xx_spi_unprepare_transfer; master->num_chipselect = sci->num_cs; master->dma_alignment = 8; master->bits_per_word_mask = BIT(32 - 1) | BIT(16 - 1) | BIT(8 - 1); /* the spi->mode bits understood by this driver: */ master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; sdd->regs = devm_ioremap_resource(&pdev->dev, mem_res); if (IS_ERR(sdd->regs)) { ret = PTR_ERR(sdd->regs); goto err0; } if (sci->cfg_gpio && sci->cfg_gpio()) { dev_err(&pdev->dev, "Unable to config gpio\n"); ret = -EBUSY; goto err0; } /* Setup clocks */ sdd->clk = devm_clk_get(&pdev->dev, "spi"); if (IS_ERR(sdd->clk)) { dev_err(&pdev->dev, "Unable to acquire clock 'spi'\n"); ret = PTR_ERR(sdd->clk); goto err0; } if (clk_prepare_enable(sdd->clk)) { dev_err(&pdev->dev, "Couldn't enable clock 'spi'\n"); ret = -EBUSY; goto err0; } sprintf(clk_name, "spi_busclk%d", sci->src_clk_nr); sdd->src_clk = devm_clk_get(&pdev->dev, clk_name); if (IS_ERR(sdd->src_clk)) { dev_err(&pdev->dev, "Unable to acquire clock '%s'\n", clk_name); ret = PTR_ERR(sdd->src_clk); goto err2; } if (clk_prepare_enable(sdd->src_clk)) { dev_err(&pdev->dev, "Couldn't enable clock '%s'\n", clk_name); ret = -EBUSY; goto err2; } /* Setup Deufult Mode */ s3c64xx_spi_hwinit(sdd, sdd->port_id); spin_lock_init(&sdd->lock); init_completion(&sdd->xfer_completion); INIT_LIST_HEAD(&sdd->queue); ret = devm_request_irq(&pdev->dev, irq, s3c64xx_spi_irq, 0, "spi-s3c64xx", sdd); if (ret != 0) { dev_err(&pdev->dev, "Failed to request IRQ %d: %d\n", irq, ret); goto err3; } writel(S3C64XX_SPI_INT_RX_OVERRUN_EN | S3C64XX_SPI_INT_RX_UNDERRUN_EN | S3C64XX_SPI_INT_TX_OVERRUN_EN | S3C64XX_SPI_INT_TX_UNDERRUN_EN, sdd->regs + S3C64XX_SPI_INT_EN); if (spi_register_master(master)) { dev_err(&pdev->dev, "cannot register SPI master\n"); ret = -EBUSY; goto err3; } dev_dbg(&pdev->dev, "Samsung SoC SPI Driver loaded for Bus SPI-%d with %d Slaves attached\n", sdd->port_id, master->num_chipselect); dev_dbg(&pdev->dev, "\tIOmem=[0x%x-0x%x]\tDMA=[Rx-%d, Tx-%d]\n", (int)mem_res->end, (int)mem_res->start, sdd->rx_dma.dmach, sdd->tx_dma.dmach); pm_runtime_set_active(&pdev->dev); pm_runtime_enable(&pdev->dev); pm_runtime_use_autosuspend(&pdev->dev); pm_runtime_set_autosuspend_delay(&pdev->dev, sdd->port_conf->clk_from_cmu ? SPI_AUTOSUSPEND_TIMEOUT : 0); return 0; err3: clk_disable_unprepare(sdd->src_clk); err2: clk_disable_unprepare(sdd->clk); err0: platform_set_drvdata(pdev, NULL); spi_master_put(master); return ret; } static int s3c64xx_spi_remove(struct platform_device *pdev) { struct spi_master *master = spi_master_get(platform_get_drvdata(pdev)); struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); pm_runtime_disable(&pdev->dev); spi_unregister_master(master); writel(0, sdd->regs + S3C64XX_SPI_INT_EN); clk_disable_unprepare(sdd->src_clk); clk_disable_unprepare(sdd->clk); platform_set_drvdata(pdev, NULL); spi_master_put(master); return 0; } static int s3c64xx_spi_suspend(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); int ret; spi_master_suspend(master); ret = pm_runtime_force_suspend(dev); if (ret < 0) return ret; sdd->cur_speed = 0; /* Output Clock is stopped */ return 0; } static int s3c64xx_spi_resume(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); struct s3c64xx_spi_info *sci = sdd->cntrlr_info; int ret; if (sci->cfg_gpio) sci->cfg_gpio(); ret = pm_runtime_force_resume(dev); if (ret < 0) return ret; s3c64xx_spi_hwinit(sdd, sdd->port_id); spi_master_resume(master); return 0; } static int s3c64xx_spi_runtime_suspend(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); clk_disable_unprepare(sdd->clk); clk_disable_unprepare(sdd->src_clk); return 0; } static int s3c64xx_spi_runtime_resume(struct device *dev) { struct spi_master *master = dev_get_drvdata(dev); struct s3c64xx_spi_driver_data *sdd = spi_master_get_devdata(master); clk_prepare_enable(sdd->src_clk); clk_prepare_enable(sdd->clk); if (sdd->port_conf->clk_from_cmu) s3c64xx_spi_hwinit(sdd, sdd->port_id); return 0; } static const struct dev_pm_ops s3c64xx_spi_pm = { SET_SYSTEM_SLEEP_PM_OPS(s3c64xx_spi_suspend, s3c64xx_spi_resume) SET_RUNTIME_PM_OPS(s3c64xx_spi_runtime_suspend, s3c64xx_spi_runtime_resume, NULL) }; static struct s3c64xx_spi_port_config exynos543x_spi_port_config = { .fifo_lvl_mask = { 0x1ff, 0x7F, 0x7F, 0x7F, 0x7F, 0x1ff, 0x1ff }, .rx_lvl_offset = 15, .tx_st_done = 25, .high_speed = true, .clk_from_cmu = true, }; static const struct of_device_id s3c64xx_spi_dt_match[] = { { .compatible = "samsung,exynos5433-isp-spi", .data = (void *)&exynos543x_spi_port_config, }, { }, }; MODULE_DEVICE_TABLE(of, s3c64xx_spi_dt_match); static struct platform_driver s3c64xx_spi_driver = { .driver = { .name = "exynos5433-isp-spi", .pm = &s3c64xx_spi_pm, .of_match_table = of_match_ptr(s3c64xx_spi_dt_match), }, .remove = s3c64xx_spi_remove, }; MODULE_ALIAS("platform:exynos5433-isp-spi"); static int __init s3c64xx_spi_init(void) { return platform_driver_probe(&s3c64xx_spi_driver, s3c64xx_spi_probe); } subsys_initcall(s3c64xx_spi_init); static void __exit s3c64xx_spi_exit(void) { platform_driver_unregister(&s3c64xx_spi_driver); } module_exit(s3c64xx_spi_exit); MODULE_AUTHOR("Jaswinder Singh "); MODULE_DESCRIPTION("S3C64XX SPI Controller Driver"); MODULE_LICENSE("GPL");