| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Sascha Hauer | 1852 | 23.12% | 18 | 16.82% |
| Jiada Wang | 1363 | 17.02% | 5 | 4.67% |
| Uwe Kleine-König | 1337 | 16.69% | 13 | 12.15% |
| Robin Gong | 969 | 12.10% | 5 | 4.67% |
| Shawn Guo | 554 | 6.92% | 7 | 6.54% |
| Anton Bondarenko | 423 | 5.28% | 9 | 8.41% |
| Maxime Chevallier | 351 | 4.38% | 3 | 2.80% |
| Alexander Shiyan | 200 | 2.50% | 3 | 2.80% |
| Huang Shijie | 149 | 1.86% | 1 | 0.93% |
| Martin Kaiser | 145 | 1.81% | 3 | 2.80% |
| Trent Piepho | 114 | 1.42% | 6 | 5.61% |
| Fabio Estevam | 99 | 1.24% | 8 | 7.48% |
| Leif Middelschulte | 72 | 0.90% | 1 | 0.93% |
| Marek Vašut | 68 | 0.85% | 2 | 1.87% |
| Knut Wohlrab | 65 | 0.81% | 2 | 1.87% |
| Christian Gmeiner | 54 | 0.67% | 1 | 0.93% |
| Stefan Agner | 46 | 0.57% | 1 | 0.93% |
| Robert Baldyga | 29 | 0.36% | 1 | 0.93% |
| Oleksij Rempel | 23 | 0.29% | 1 | 0.93% |
| David Jander | 13 | 0.16% | 1 | 0.93% |
| Arnd Bergmann | 11 | 0.14% | 2 | 1.87% |
| Stephen Warren | 11 | 0.14% | 1 | 0.93% |
| Greg Ungerer | 10 | 0.12% | 1 | 0.93% |
| Nicholas Mc Guire | 8 | 0.10% | 1 | 0.93% |
| Hui Wang | 7 | 0.09% | 1 | 0.93% |
| Niels de Vos | 7 | 0.09% | 1 | 0.93% |
| Alberto Panizzo | 6 | 0.07% | 1 | 0.93% |
| Daniel Mack | 6 | 0.07% | 1 | 0.93% |
| Kees Cook | 5 | 0.06% | 1 | 0.93% |
| Sachin Kamat | 4 | 0.05% | 1 | 0.93% |
| Tejun Heo | 3 | 0.04% | 1 | 0.93% |
| Grant C. Likely | 2 | 0.02% | 1 | 0.93% |
| Richard Genoud | 1 | 0.01% | 1 | 0.93% |
| wangbo | 1 | 0.01% | 1 | 0.93% |
| Krzysztof Kozlowski | 1 | 0.01% | 1 | 0.93% |
| Total | 8009 | 107 |
// SPDX-License-Identifier: GPL-2.0+ // Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. // Copyright (C) 2008 Juergen Beisert #include <linux/clk.h> #include <linux/completion.h> #include <linux/delay.h> #include <linux/dmaengine.h> #include <linux/dma-mapping.h> #include <linux/err.h> #include <linux/gpio.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/irq.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <linux/spi/spi.h> #include <linux/spi/spi_bitbang.h> #include <linux/types.h> #include <linux/of.h> #include <linux/of_device.h> #include <linux/of_gpio.h> #include <linux/platform_data/dma-imx.h> #include <linux/platform_data/spi-imx.h> #define DRIVER_NAME "spi_imx" static bool use_dma = true; module_param(use_dma, bool, 0644); MODULE_PARM_DESC(use_dma, "Enable usage of DMA when available (default)"); #define MXC_CSPIRXDATA 0x00 #define MXC_CSPITXDATA 0x04 #define MXC_CSPICTRL 0x08 #define MXC_CSPIINT 0x0c #define MXC_RESET 0x1c /* generic defines to abstract from the different register layouts */ #define MXC_INT_RR (1 << 0) /* Receive data ready interrupt */ #define MXC_INT_TE (1 << 1) /* Transmit FIFO empty interrupt */ #define MXC_INT_RDR BIT(4) /* Receive date threshold interrupt */ /* The maximum bytes that a sdma BD can transfer. */ #define MAX_SDMA_BD_BYTES (1 << 15) #define MX51_ECSPI_CTRL_MAX_BURST 512 /* The maximum bytes that IMX53_ECSPI can transfer in slave mode.*/ #define MX53_MAX_TRANSFER_BYTES 512 enum spi_imx_devtype { IMX1_CSPI, IMX21_CSPI, IMX27_CSPI, IMX31_CSPI, IMX35_CSPI, /* CSPI on all i.mx except above */ IMX51_ECSPI, /* ECSPI on i.mx51 */ IMX53_ECSPI, /* ECSPI on i.mx53 and later */ }; struct spi_imx_data; struct spi_imx_devtype_data { void (*intctrl)(struct spi_imx_data *, int); int (*prepare_message)(struct spi_imx_data *, struct spi_message *); int (*prepare_transfer)(struct spi_imx_data *, struct spi_device *, struct spi_transfer *); void (*trigger)(struct spi_imx_data *); int (*rx_available)(struct spi_imx_data *); void (*reset)(struct spi_imx_data *); void (*setup_wml)(struct spi_imx_data *); void (*disable)(struct spi_imx_data *); bool has_dmamode; bool has_slavemode; unsigned int fifo_size; bool dynamic_burst; enum spi_imx_devtype devtype; }; struct spi_imx_data { struct spi_bitbang bitbang; struct device *dev; struct completion xfer_done; void __iomem *base; unsigned long base_phys; struct clk *clk_per; struct clk *clk_ipg; unsigned long spi_clk; unsigned int spi_bus_clk; unsigned int bits_per_word; unsigned int spi_drctl; unsigned int count, remainder; void (*tx)(struct spi_imx_data *); void (*rx)(struct spi_imx_data *); void *rx_buf; const void *tx_buf; unsigned int txfifo; /* number of words pushed in tx FIFO */ unsigned int dynamic_burst; /* Slave mode */ bool slave_mode; bool slave_aborted; unsigned int slave_burst; /* DMA */ bool usedma; u32 wml; struct completion dma_rx_completion; struct completion dma_tx_completion; const struct spi_imx_devtype_data *devtype_data; }; static inline int is_imx27_cspi(struct spi_imx_data *d) { return d->devtype_data->devtype == IMX27_CSPI; } static inline int is_imx35_cspi(struct spi_imx_data *d) { return d->devtype_data->devtype == IMX35_CSPI; } static inline int is_imx51_ecspi(struct spi_imx_data *d) { return d->devtype_data->devtype == IMX51_ECSPI; } static inline int is_imx53_ecspi(struct spi_imx_data *d) { return d->devtype_data->devtype == IMX53_ECSPI; } #define MXC_SPI_BUF_RX(type) \ static void spi_imx_buf_rx_##type(struct spi_imx_data *spi_imx) \ { \ unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA); \ \ if (spi_imx->rx_buf) { \ *(type *)spi_imx->rx_buf = val; \ spi_imx->rx_buf += sizeof(type); \ } \ \ spi_imx->remainder -= sizeof(type); \ } #define MXC_SPI_BUF_TX(type) \ static void spi_imx_buf_tx_##type(struct spi_imx_data *spi_imx) \ { \ type val = 0; \ \ if (spi_imx->tx_buf) { \ val = *(type *)spi_imx->tx_buf; \ spi_imx->tx_buf += sizeof(type); \ } \ \ spi_imx->count -= sizeof(type); \ \ writel(val, spi_imx->base + MXC_CSPITXDATA); \ } MXC_SPI_BUF_RX(u8) MXC_SPI_BUF_TX(u8) MXC_SPI_BUF_RX(u16) MXC_SPI_BUF_TX(u16) MXC_SPI_BUF_RX(u32) MXC_SPI_BUF_TX(u32) /* First entry is reserved, second entry is valid only if SDHC_SPIEN is set * (which is currently not the case in this driver) */ static int mxc_clkdivs[] = {0, 3, 4, 6, 8, 12, 16, 24, 32, 48, 64, 96, 128, 192, 256, 384, 512, 768, 1024}; /* MX21, MX27 */ static unsigned int spi_imx_clkdiv_1(unsigned int fin, unsigned int fspi, unsigned int max, unsigned int *fres) { int i; for (i = 2; i < max; i++) if (fspi * mxc_clkdivs[i] >= fin) break; *fres = fin / mxc_clkdivs[i]; return i; } /* MX1, MX31, MX35, MX51 CSPI */ static unsigned int spi_imx_clkdiv_2(unsigned int fin, unsigned int fspi, unsigned int *fres) { int i, div = 4; for (i = 0; i < 7; i++) { if (fspi * div >= fin) goto out; div <<= 1; } out: *fres = fin / div; return i; } static int spi_imx_bytes_per_word(const int bits_per_word) { if (bits_per_word <= 8) return 1; else if (bits_per_word <= 16) return 2; else return 4; } static bool spi_imx_can_dma(struct spi_master *master, struct spi_device *spi, struct spi_transfer *transfer) { struct spi_imx_data *spi_imx = spi_master_get_devdata(master); if (!use_dma) return false; if (!master->dma_rx) return false; if (spi_imx->slave_mode) return false; if (transfer->len < spi_imx->devtype_data->fifo_size) return false; spi_imx->dynamic_burst = 0; return true; } #define MX51_ECSPI_CTRL 0x08 #define MX51_ECSPI_CTRL_ENABLE (1 << 0) #define MX51_ECSPI_CTRL_XCH (1 << 2) #define MX51_ECSPI_CTRL_SMC (1 << 3) #define MX51_ECSPI_CTRL_MODE_MASK (0xf << 4) #define MX51_ECSPI_CTRL_DRCTL(drctl) ((drctl) << 16) #define MX51_ECSPI_CTRL_POSTDIV_OFFSET 8 #define MX51_ECSPI_CTRL_PREDIV_OFFSET 12 #define MX51_ECSPI_CTRL_CS(cs) ((cs) << 18) #define MX51_ECSPI_CTRL_BL_OFFSET 20 #define MX51_ECSPI_CTRL_BL_MASK (0xfff << 20) #define MX51_ECSPI_CONFIG 0x0c #define MX51_ECSPI_CONFIG_SCLKPHA(cs) (1 << ((cs) + 0)) #define MX51_ECSPI_CONFIG_SCLKPOL(cs) (1 << ((cs) + 4)) #define MX51_ECSPI_CONFIG_SBBCTRL(cs) (1 << ((cs) + 8)) #define MX51_ECSPI_CONFIG_SSBPOL(cs) (1 << ((cs) + 12)) #define MX51_ECSPI_CONFIG_SCLKCTL(cs) (1 << ((cs) + 20)) #define MX51_ECSPI_INT 0x10 #define MX51_ECSPI_INT_TEEN (1 << 0) #define MX51_ECSPI_INT_RREN (1 << 3) #define MX51_ECSPI_INT_RDREN (1 << 4) #define MX51_ECSPI_DMA 0x14 #define MX51_ECSPI_DMA_TX_WML(wml) ((wml) & 0x3f) #define MX51_ECSPI_DMA_RX_WML(wml) (((wml) & 0x3f) << 16) #define MX51_ECSPI_DMA_RXT_WML(wml) (((wml) & 0x3f) << 24) #define MX51_ECSPI_DMA_TEDEN (1 << 7) #define MX51_ECSPI_DMA_RXDEN (1 << 23) #define MX51_ECSPI_DMA_RXTDEN (1 << 31) #define MX51_ECSPI_STAT 0x18 #define MX51_ECSPI_STAT_RR (1 << 3) #define MX51_ECSPI_TESTREG 0x20 #define MX51_ECSPI_TESTREG_LBC BIT(31) static void spi_imx_buf_rx_swap_u32(struct spi_imx_data *spi_imx) { unsigned int val = readl(spi_imx->base + MXC_CSPIRXDATA); #ifdef __LITTLE_ENDIAN unsigned int bytes_per_word; #endif if (spi_imx->rx_buf) { #ifdef __LITTLE_ENDIAN bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word); if (bytes_per_word == 1) val = cpu_to_be32(val); else if (bytes_per_word == 2) val = (val << 16) | (val >> 16); #endif *(u32 *)spi_imx->rx_buf = val; spi_imx->rx_buf += sizeof(u32); } spi_imx->remainder -= sizeof(u32); } static void spi_imx_buf_rx_swap(struct spi_imx_data *spi_imx) { int unaligned; u32 val; unaligned = spi_imx->remainder % 4; if (!unaligned) { spi_imx_buf_rx_swap_u32(spi_imx); return; } if (spi_imx_bytes_per_word(spi_imx->bits_per_word) == 2) { spi_imx_buf_rx_u16(spi_imx); return; } val = readl(spi_imx->base + MXC_CSPIRXDATA); while (unaligned--) { if (spi_imx->rx_buf) { *(u8 *)spi_imx->rx_buf = (val >> (8 * unaligned)) & 0xff; spi_imx->rx_buf++; } spi_imx->remainder--; } } static void spi_imx_buf_tx_swap_u32(struct spi_imx_data *spi_imx) { u32 val = 0; #ifdef __LITTLE_ENDIAN unsigned int bytes_per_word; #endif if (spi_imx->tx_buf) { val = *(u32 *)spi_imx->tx_buf; spi_imx->tx_buf += sizeof(u32); } spi_imx->count -= sizeof(u32); #ifdef __LITTLE_ENDIAN bytes_per_word = spi_imx_bytes_per_word(spi_imx->bits_per_word); if (bytes_per_word == 1) val = cpu_to_be32(val); else if (bytes_per_word == 2) val = (val << 16) | (val >> 16); #endif writel(val, spi_imx->base + MXC_CSPITXDATA); } static void spi_imx_buf_tx_swap(struct spi_imx_data *spi_imx) { int unaligned; u32 val = 0; unaligned = spi_imx->count % 4; if (!unaligned) { spi_imx_buf_tx_swap_u32(spi_imx); return; } if (spi_imx_bytes_per_word(spi_imx->bits_per_word) == 2) { spi_imx_buf_tx_u16(spi_imx); return; } while (unaligned--) { if (spi_imx->tx_buf) { val |= *(u8 *)spi_imx->tx_buf << (8 * unaligned); spi_imx->tx_buf++; } spi_imx->count--; } writel(val, spi_imx->base + MXC_CSPITXDATA); } static void mx53_ecspi_rx_slave(struct spi_imx_data *spi_imx) { u32 val = be32_to_cpu(readl(spi_imx->base + MXC_CSPIRXDATA)); if (spi_imx->rx_buf) { int n_bytes = spi_imx->slave_burst % sizeof(val); if (!n_bytes) n_bytes = sizeof(val); memcpy(spi_imx->rx_buf, ((u8 *)&val) + sizeof(val) - n_bytes, n_bytes); spi_imx->rx_buf += n_bytes; spi_imx->slave_burst -= n_bytes; } spi_imx->remainder -= sizeof(u32); } static void mx53_ecspi_tx_slave(struct spi_imx_data *spi_imx) { u32 val = 0; int n_bytes = spi_imx->count % sizeof(val); if (!n_bytes) n_bytes = sizeof(val); if (spi_imx->tx_buf) { memcpy(((u8 *)&val) + sizeof(val) - n_bytes, spi_imx->tx_buf, n_bytes); val = cpu_to_be32(val); spi_imx->tx_buf += n_bytes; } spi_imx->count -= n_bytes; writel(val, spi_imx->base + MXC_CSPITXDATA); } /* MX51 eCSPI */ static unsigned int mx51_ecspi_clkdiv(struct spi_imx_data *spi_imx, unsigned int fspi, unsigned int *fres) { /* * there are two 4-bit dividers, the pre-divider divides by * $pre, the post-divider by 2^$post */ unsigned int pre, post; unsigned int fin = spi_imx->spi_clk; if (unlikely(fspi > fin)) return 0; post = fls(fin) - fls(fspi); if (fin > fspi << post) post++; /* now we have: (fin <= fspi << post) with post being minimal */ post = max(4U, post) - 4; if (unlikely(post > 0xf)) { dev_err(spi_imx->dev, "cannot set clock freq: %u (base freq: %u)\n", fspi, fin); return 0xff; } pre = DIV_ROUND_UP(fin, fspi << post) - 1; dev_dbg(spi_imx->dev, "%s: fin: %u, fspi: %u, post: %u, pre: %u\n", __func__, fin, fspi, post, pre); /* Resulting frequency for the SCLK line. */ *fres = (fin / (pre + 1)) >> post; return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) | (post << MX51_ECSPI_CTRL_POSTDIV_OFFSET); } static void mx51_ecspi_intctrl(struct spi_imx_data *spi_imx, int enable) { unsigned val = 0; if (enable & MXC_INT_TE) val |= MX51_ECSPI_INT_TEEN; if (enable & MXC_INT_RR) val |= MX51_ECSPI_INT_RREN; if (enable & MXC_INT_RDR) val |= MX51_ECSPI_INT_RDREN; writel(val, spi_imx->base + MX51_ECSPI_INT); } static void mx51_ecspi_trigger(struct spi_imx_data *spi_imx) { u32 reg; reg = readl(spi_imx->base + MX51_ECSPI_CTRL); reg |= MX51_ECSPI_CTRL_XCH; writel(reg, spi_imx->base + MX51_ECSPI_CTRL); } static void mx51_ecspi_disable(struct spi_imx_data *spi_imx) { u32 ctrl; ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL); ctrl &= ~MX51_ECSPI_CTRL_ENABLE; writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); } static int mx51_ecspi_prepare_message(struct spi_imx_data *spi_imx, struct spi_message *msg) { struct spi_device *spi = msg->spi; u32 ctrl = MX51_ECSPI_CTRL_ENABLE; u32 testreg; u32 cfg = readl(spi_imx->base + MX51_ECSPI_CONFIG); /* set Master or Slave mode */ if (spi_imx->slave_mode) ctrl &= ~MX51_ECSPI_CTRL_MODE_MASK; else ctrl |= MX51_ECSPI_CTRL_MODE_MASK; /* * Enable SPI_RDY handling (falling edge/level triggered). */ if (spi->mode & SPI_READY) ctrl |= MX51_ECSPI_CTRL_DRCTL(spi_imx->spi_drctl); /* set chip select to use */ ctrl |= MX51_ECSPI_CTRL_CS(spi->chip_select); /* * The ctrl register must be written first, with the EN bit set other * registers must not be written to. */ writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); testreg = readl(spi_imx->base + MX51_ECSPI_TESTREG); if (spi->mode & SPI_LOOP) testreg |= MX51_ECSPI_TESTREG_LBC; else testreg &= ~MX51_ECSPI_TESTREG_LBC; writel(testreg, spi_imx->base + MX51_ECSPI_TESTREG); /* * eCSPI burst completion by Chip Select signal in Slave mode * is not functional for imx53 Soc, config SPI burst completed when * BURST_LENGTH + 1 bits are received */ if (spi_imx->slave_mode && is_imx53_ecspi(spi_imx)) cfg &= ~MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select); else cfg |= MX51_ECSPI_CONFIG_SBBCTRL(spi->chip_select); if (spi->mode & SPI_CPHA) cfg |= MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select); else cfg &= ~MX51_ECSPI_CONFIG_SCLKPHA(spi->chip_select); if (spi->mode & SPI_CPOL) { cfg |= MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select); cfg |= MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select); } else { cfg &= ~MX51_ECSPI_CONFIG_SCLKPOL(spi->chip_select); cfg &= ~MX51_ECSPI_CONFIG_SCLKCTL(spi->chip_select); } if (spi->mode & SPI_CS_HIGH) cfg |= MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select); else cfg &= ~MX51_ECSPI_CONFIG_SSBPOL(spi->chip_select); writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG); return 0; } static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx, struct spi_device *spi, struct spi_transfer *t) { u32 ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL); u32 clk = t->speed_hz, delay; /* Clear BL field and set the right value */ ctrl &= ~MX51_ECSPI_CTRL_BL_MASK; if (spi_imx->slave_mode && is_imx53_ecspi(spi_imx)) ctrl |= (spi_imx->slave_burst * 8 - 1) << MX51_ECSPI_CTRL_BL_OFFSET; else ctrl |= (spi_imx->bits_per_word - 1) << MX51_ECSPI_CTRL_BL_OFFSET; /* set clock speed */ ctrl &= ~(0xf << MX51_ECSPI_CTRL_POSTDIV_OFFSET | 0xf << MX51_ECSPI_CTRL_PREDIV_OFFSET); ctrl |= mx51_ecspi_clkdiv(spi_imx, t->speed_hz, &clk); spi_imx->spi_bus_clk = clk; if (spi_imx->usedma) ctrl |= MX51_ECSPI_CTRL_SMC; writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); /* * Wait until the changes in the configuration register CONFIGREG * propagate into the hardware. It takes exactly one tick of the * SCLK clock, but we will wait two SCLK clock just to be sure. The * effect of the delay it takes for the hardware to apply changes * is noticable if the SCLK clock run very slow. In such a case, if * the polarity of SCLK should be inverted, the GPIO ChipSelect might * be asserted before the SCLK polarity changes, which would disrupt * the SPI communication as the device on the other end would consider * the change of SCLK polarity as a clock tick already. */ delay = (2 * 1000000) / clk; if (likely(delay < 10)) /* SCLK is faster than 100 kHz */ udelay(delay); else /* SCLK is _very_ slow */ usleep_range(delay, delay + 10); return 0; } static void mx51_setup_wml(struct spi_imx_data *spi_imx) { /* * Configure the DMA register: setup the watermark * and enable DMA request. */ writel(MX51_ECSPI_DMA_RX_WML(spi_imx->wml - 1) | MX51_ECSPI_DMA_TX_WML(spi_imx->wml) | MX51_ECSPI_DMA_RXT_WML(spi_imx->wml) | MX51_ECSPI_DMA_TEDEN | MX51_ECSPI_DMA_RXDEN | MX51_ECSPI_DMA_RXTDEN, spi_imx->base + MX51_ECSPI_DMA); } static int mx51_ecspi_rx_available(struct spi_imx_data *spi_imx) { return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR; } static void mx51_ecspi_reset(struct spi_imx_data *spi_imx) { /* drain receive buffer */ while (mx51_ecspi_rx_available(spi_imx)) readl(spi_imx->base + MXC_CSPIRXDATA); } #define MX31_INTREG_TEEN (1 << 0) #define MX31_INTREG_RREN (1 << 3) #define MX31_CSPICTRL_ENABLE (1 << 0) #define MX31_CSPICTRL_MASTER (1 << 1) #define MX31_CSPICTRL_XCH (1 << 2) #define MX31_CSPICTRL_SMC (1 << 3) #define MX31_CSPICTRL_POL (1 << 4) #define MX31_CSPICTRL_PHA (1 << 5) #define MX31_CSPICTRL_SSCTL (1 << 6) #define MX31_CSPICTRL_SSPOL (1 << 7) #define MX31_CSPICTRL_BC_SHIFT 8 #define MX35_CSPICTRL_BL_SHIFT 20 #define MX31_CSPICTRL_CS_SHIFT 24 #define MX35_CSPICTRL_CS_SHIFT 12 #define MX31_CSPICTRL_DR_SHIFT 16 #define MX31_CSPI_DMAREG 0x10 #define MX31_DMAREG_RH_DEN (1<<4) #define MX31_DMAREG_TH_DEN (1<<1) #define MX31_CSPISTATUS 0x14 #define MX31_STATUS_RR (1 << 3) #define MX31_CSPI_TESTREG 0x1C #define MX31_TEST_LBC (1 << 14) /* These functions also work for the i.MX35, but be aware that * the i.MX35 has a slightly different register layout for bits * we do not use here. */ static void mx31_intctrl(struct spi_imx_data *spi_imx, int enable) { unsigned int val = 0; if (enable & MXC_INT_TE) val |= MX31_INTREG_TEEN; if (enable & MXC_INT_RR) val |= MX31_INTREG_RREN; writel(val, spi_imx->base + MXC_CSPIINT); } static void mx31_trigger(struct spi_imx_data *spi_imx) { unsigned int reg; reg = readl(spi_imx->base + MXC_CSPICTRL); reg |= MX31_CSPICTRL_XCH; writel(reg, spi_imx->base + MXC_CSPICTRL); } static int mx31_prepare_message(struct spi_imx_data *spi_imx, struct spi_message *msg) { return 0; } static int mx31_prepare_transfer(struct spi_imx_data *spi_imx, struct spi_device *spi, struct spi_transfer *t) { unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER; unsigned int clk; reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, t->speed_hz, &clk) << MX31_CSPICTRL_DR_SHIFT; spi_imx->spi_bus_clk = clk; if (is_imx35_cspi(spi_imx)) { reg |= (spi_imx->bits_per_word - 1) << MX35_CSPICTRL_BL_SHIFT; reg |= MX31_CSPICTRL_SSCTL; } else { reg |= (spi_imx->bits_per_word - 1) << MX31_CSPICTRL_BC_SHIFT; } if (spi->mode & SPI_CPHA) reg |= MX31_CSPICTRL_PHA; if (spi->mode & SPI_CPOL) reg |= MX31_CSPICTRL_POL; if (spi->mode & SPI_CS_HIGH) reg |= MX31_CSPICTRL_SSPOL; if (!gpio_is_valid(spi->cs_gpio)) reg |= (spi->chip_select) << (is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT : MX31_CSPICTRL_CS_SHIFT); if (spi_imx->usedma) reg |= MX31_CSPICTRL_SMC; writel(reg, spi_imx->base + MXC_CSPICTRL); reg = readl(spi_imx->base + MX31_CSPI_TESTREG); if (spi->mode & SPI_LOOP) reg |= MX31_TEST_LBC; else reg &= ~MX31_TEST_LBC; writel(reg, spi_imx->base + MX31_CSPI_TESTREG); if (spi_imx->usedma) { /* * configure DMA requests when RXFIFO is half full and * when TXFIFO is half empty */ writel(MX31_DMAREG_RH_DEN | MX31_DMAREG_TH_DEN, spi_imx->base + MX31_CSPI_DMAREG); } return 0; } static int mx31_rx_available(struct spi_imx_data *spi_imx) { return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR; } static void mx31_reset(struct spi_imx_data *spi_imx) { /* drain receive buffer */ while (readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR) readl(spi_imx->base + MXC_CSPIRXDATA); } #define MX21_INTREG_RR (1 << 4) #define MX21_INTREG_TEEN (1 << 9) #define MX21_INTREG_RREN (1 << 13) #define MX21_CSPICTRL_POL (1 << 5) #define MX21_CSPICTRL_PHA (1 << 6) #define MX21_CSPICTRL_SSPOL (1 << 8) #define MX21_CSPICTRL_XCH (1 << 9) #define MX21_CSPICTRL_ENABLE (1 << 10) #define MX21_CSPICTRL_MASTER (1 << 11) #define MX21_CSPICTRL_DR_SHIFT 14 #define MX21_CSPICTRL_CS_SHIFT 19 static void mx21_intctrl(struct spi_imx_data *spi_imx, int enable) { unsigned int val = 0; if (enable & MXC_INT_TE) val |= MX21_INTREG_TEEN; if (enable & MXC_INT_RR) val |= MX21_INTREG_RREN; writel(val, spi_imx->base + MXC_CSPIINT); } static void mx21_trigger(struct spi_imx_data *spi_imx) { unsigned int reg; reg = readl(spi_imx->base + MXC_CSPICTRL); reg |= MX21_CSPICTRL_XCH; writel(reg, spi_imx->base + MXC_CSPICTRL); } static int mx21_prepare_message(struct spi_imx_data *spi_imx, struct spi_message *msg) { return 0; } static int mx21_prepare_transfer(struct spi_imx_data *spi_imx, struct spi_device *spi, struct spi_transfer *t) { unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER; unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18; unsigned int clk; reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, t->speed_hz, max, &clk) << MX21_CSPICTRL_DR_SHIFT; spi_imx->spi_bus_clk = clk; reg |= spi_imx->bits_per_word - 1; if (spi->mode & SPI_CPHA) reg |= MX21_CSPICTRL_PHA; if (spi->mode & SPI_CPOL) reg |= MX21_CSPICTRL_POL; if (spi->mode & SPI_CS_HIGH) reg |= MX21_CSPICTRL_SSPOL; if (!gpio_is_valid(spi->cs_gpio)) reg |= spi->chip_select << MX21_CSPICTRL_CS_SHIFT; writel(reg, spi_imx->base + MXC_CSPICTRL); return 0; } static int mx21_rx_available(struct spi_imx_data *spi_imx) { return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR; } static void mx21_reset(struct spi_imx_data *spi_imx) { writel(1, spi_imx->base + MXC_RESET); } #define MX1_INTREG_RR (1 << 3) #define MX1_INTREG_TEEN (1 << 8) #define MX1_INTREG_RREN (1 << 11) #define MX1_CSPICTRL_POL (1 << 4) #define MX1_CSPICTRL_PHA (1 << 5) #define MX1_CSPICTRL_XCH (1 << 8) #define MX1_CSPICTRL_ENABLE (1 << 9) #define MX1_CSPICTRL_MASTER (1 << 10) #define MX1_CSPICTRL_DR_SHIFT 13 static void mx1_intctrl(struct spi_imx_data *spi_imx, int enable) { unsigned int val = 0; if (enable & MXC_INT_TE) val |= MX1_INTREG_TEEN; if (enable & MXC_INT_RR) val |= MX1_INTREG_RREN; writel(val, spi_imx->base + MXC_CSPIINT); } static void mx1_trigger(struct spi_imx_data *spi_imx) { unsigned int reg; reg = readl(spi_imx->base + MXC_CSPICTRL); reg |= MX1_CSPICTRL_XCH; writel(reg, spi_imx->base + MXC_CSPICTRL); } static int mx1_prepare_message(struct spi_imx_data *spi_imx, struct spi_message *msg) { return 0; } static int mx1_prepare_transfer(struct spi_imx_data *spi_imx, struct spi_device *spi, struct spi_transfer *t) { unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER; unsigned int clk; reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, t->speed_hz, &clk) << MX1_CSPICTRL_DR_SHIFT; spi_imx->spi_bus_clk = clk; reg |= spi_imx->bits_per_word - 1; if (spi->mode & SPI_CPHA) reg |= MX1_CSPICTRL_PHA; if (spi->mode & SPI_CPOL) reg |= MX1_CSPICTRL_POL; writel(reg, spi_imx->base + MXC_CSPICTRL); return 0; } static int mx1_rx_available(struct spi_imx_data *spi_imx) { return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR; } static void mx1_reset(struct spi_imx_data *spi_imx) { writel(1, spi_imx->base + MXC_RESET); } static struct spi_imx_devtype_data imx1_cspi_devtype_data = { .intctrl = mx1_intctrl, .prepare_message = mx1_prepare_message, .prepare_transfer = mx1_prepare_transfer, .trigger = mx1_trigger, .rx_available = mx1_rx_available, .reset = mx1_reset, .fifo_size = 8, .has_dmamode = false, .dynamic_burst = false, .has_slavemode = false, .devtype = IMX1_CSPI, }; static struct spi_imx_devtype_data imx21_cspi_devtype_data = { .intctrl = mx21_intctrl, .prepare_message = mx21_prepare_message, .prepare_transfer = mx21_prepare_transfer, .trigger = mx21_trigger, .rx_available = mx21_rx_available, .reset = mx21_reset, .fifo_size = 8, .has_dmamode = false, .dynamic_burst = false, .has_slavemode = false, .devtype = IMX21_CSPI, }; static struct spi_imx_devtype_data imx27_cspi_devtype_data = { /* i.mx27 cspi shares the functions with i.mx21 one */ .intctrl = mx21_intctrl, .prepare_message = mx21_prepare_message, .prepare_transfer = mx21_prepare_transfer, .trigger = mx21_trigger, .rx_available = mx21_rx_available, .reset = mx21_reset, .fifo_size = 8, .has_dmamode = false, .dynamic_burst = false, .has_slavemode = false, .devtype = IMX27_CSPI, }; static struct spi_imx_devtype_data imx31_cspi_devtype_data = { .intctrl = mx31_intctrl, .prepare_message = mx31_prepare_message, .prepare_transfer = mx31_prepare_transfer, .trigger = mx31_trigger, .rx_available = mx31_rx_available, .reset = mx31_reset, .fifo_size = 8, .has_dmamode = false, .dynamic_burst = false, .has_slavemode = false, .devtype = IMX31_CSPI, }; static struct spi_imx_devtype_data imx35_cspi_devtype_data = { /* i.mx35 and later cspi shares the functions with i.mx31 one */ .intctrl = mx31_intctrl, .prepare_message = mx31_prepare_message, .prepare_transfer = mx31_prepare_transfer, .trigger = mx31_trigger, .rx_available = mx31_rx_available, .reset = mx31_reset, .fifo_size = 8, .has_dmamode = true, .dynamic_burst = false, .has_slavemode = false, .devtype = IMX35_CSPI, }; static struct spi_imx_devtype_data imx51_ecspi_devtype_data = { .intctrl = mx51_ecspi_intctrl, .prepare_message = mx51_ecspi_prepare_message, .prepare_transfer = mx51_ecspi_prepare_transfer, .trigger = mx51_ecspi_trigger, .rx_available = mx51_ecspi_rx_available, .reset = mx51_ecspi_reset, .setup_wml = mx51_setup_wml, .fifo_size = 64, .has_dmamode = true, .dynamic_burst = true, .has_slavemode = true, .disable = mx51_ecspi_disable, .devtype = IMX51_ECSPI, }; static struct spi_imx_devtype_data imx53_ecspi_devtype_data = { .intctrl = mx51_ecspi_intctrl, .prepare_message = mx51_ecspi_prepare_message, .prepare_transfer = mx51_ecspi_prepare_transfer, .trigger = mx51_ecspi_trigger, .rx_available = mx51_ecspi_rx_available, .reset = mx51_ecspi_reset, .fifo_size = 64, .has_dmamode = true, .has_slavemode = true, .disable = mx51_ecspi_disable, .devtype = IMX53_ECSPI, }; static const struct platform_device_id spi_imx_devtype[] = { { .name = "imx1-cspi", .driver_data = (kernel_ulong_t) &imx1_cspi_devtype_data, }, { .name = "imx21-cspi", .driver_data = (kernel_ulong_t) &imx21_cspi_devtype_data, }, { .name = "imx27-cspi", .driver_data = (kernel_ulong_t) &imx27_cspi_devtype_data, }, { .name = "imx31-cspi", .driver_data = (kernel_ulong_t) &imx31_cspi_devtype_data, }, { .name = "imx35-cspi", .driver_data = (kernel_ulong_t) &imx35_cspi_devtype_data, }, { .name = "imx51-ecspi", .driver_data = (kernel_ulong_t) &imx51_ecspi_devtype_data, }, { .name = "imx53-ecspi", .driver_data = (kernel_ulong_t) &imx53_ecspi_devtype_data, }, { /* sentinel */ } }; static const struct of_device_id spi_imx_dt_ids[] = { { .compatible = "fsl,imx1-cspi", .data = &imx1_cspi_devtype_data, }, { .compatible = "fsl,imx21-cspi", .data = &imx21_cspi_devtype_data, }, { .compatible = "fsl,imx27-cspi", .data = &imx27_cspi_devtype_data, }, { .compatible = "fsl,imx31-cspi", .data = &imx31_cspi_devtype_data, }, { .compatible = "fsl,imx35-cspi", .data = &imx35_cspi_devtype_data, }, { .compatible = "fsl,imx51-ecspi", .data = &imx51_ecspi_devtype_data, }, { .compatible = "fsl,imx53-ecspi", .data = &imx53_ecspi_devtype_data, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, spi_imx_dt_ids); static void spi_imx_chipselect(struct spi_device *spi, int is_active) { int active = is_active != BITBANG_CS_INACTIVE; int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH); if (spi->mode & SPI_NO_CS) return; if (!gpio_is_valid(spi->cs_gpio)) return; gpio_set_value(spi->cs_gpio, dev_is_lowactive ^ active); } static void spi_imx_set_burst_len(struct spi_imx_data *spi_imx, int n_bits) { u32 ctrl; ctrl = readl(spi_imx->base + MX51_ECSPI_CTRL); ctrl &= ~MX51_ECSPI_CTRL_BL_MASK; ctrl |= ((n_bits - 1) << MX51_ECSPI_CTRL_BL_OFFSET); writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); } static void spi_imx_push(struct spi_imx_data *spi_imx) { unsigned int burst_len, fifo_words; if (spi_imx->dynamic_burst) fifo_words = 4; else fifo_words = spi_imx_bytes_per_word(spi_imx->bits_per_word); /* * Reload the FIFO when the remaining bytes to be transferred in the * current burst is 0. This only applies when bits_per_word is a * multiple of 8. */ if (!spi_imx->remainder) { if (spi_imx->dynamic_burst) { /* We need to deal unaligned data first */ burst_len = spi_imx->count % MX51_ECSPI_CTRL_MAX_BURST; if (!burst_len) burst_len = MX51_ECSPI_CTRL_MAX_BURST; spi_imx_set_burst_len(spi_imx, burst_len * 8); spi_imx->remainder = burst_len; } else { spi_imx->remainder = fifo_words; } } while (spi_imx->txfifo < spi_imx->devtype_data->fifo_size) { if (!spi_imx->count) break; if (spi_imx->dynamic_burst && spi_imx->txfifo >= DIV_ROUND_UP(spi_imx->remainder, fifo_words)) break; spi_imx->tx(spi_imx); spi_imx->txfifo++; } if (!spi_imx->slave_mode) spi_imx->devtype_data->trigger(spi_imx); } static irqreturn_t spi_imx_isr(int irq, void *dev_id) { struct spi_imx_data *spi_imx = dev_id; while (spi_imx->txfifo && spi_imx->devtype_data->rx_available(spi_imx)) { spi_imx->rx(spi_imx); spi_imx->txfifo--; } if (spi_imx->count) { spi_imx_push(spi_imx); return IRQ_HANDLED; } if (spi_imx->txfifo) { /* No data left to push, but still waiting for rx data, * enable receive data available interrupt. */ spi_imx->devtype_data->intctrl( spi_imx, MXC_INT_RR); return IRQ_HANDLED; } spi_imx->devtype_data->intctrl(spi_imx, 0); complete(&spi_imx->xfer_done); return IRQ_HANDLED; } static int spi_imx_dma_configure(struct spi_master *master) { int ret; enum dma_slave_buswidth buswidth; struct dma_slave_config rx = {}, tx = {}; struct spi_imx_data *spi_imx = spi_master_get_devdata(master); switch (spi_imx_bytes_per_word(spi_imx->bits_per_word)) { case 4: buswidth = DMA_SLAVE_BUSWIDTH_4_BYTES; break; case 2: buswidth = DMA_SLAVE_BUSWIDTH_2_BYTES; break; case 1: buswidth = DMA_SLAVE_BUSWIDTH_1_BYTE; break; default: return -EINVAL; } tx.direction = DMA_MEM_TO_DEV; tx.dst_addr = spi_imx->base_phys + MXC_CSPITXDATA; tx.dst_addr_width = buswidth; tx.dst_maxburst = spi_imx->wml; ret = dmaengine_slave_config(master->dma_tx, &tx); if (ret) { dev_err(spi_imx->dev, "TX dma configuration failed with %d\n", ret); return ret; } rx.direction = DMA_DEV_TO_MEM; rx.src_addr = spi_imx->base_phys + MXC_CSPIRXDATA; rx.src_addr_width = buswidth; rx.src_maxburst = spi_imx->wml; ret = dmaengine_slave_config(master->dma_rx, &rx); if (ret) { dev_err(spi_imx->dev, "RX dma configuration failed with %d\n", ret); return ret; } return 0; } static int spi_imx_setupxfer(struct spi_device *spi, struct spi_transfer *t) { struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); if (!t) return 0; spi_imx->bits_per_word = t->bits_per_word; /* * Initialize the functions for transfer. To transfer non byte-aligned * words, we have to use multiple word-size bursts, we can't use * dynamic_burst in that case. */ if (spi_imx->devtype_data->dynamic_burst && !spi_imx->slave_mode && (spi_imx->bits_per_word == 8 || spi_imx->bits_per_word == 16 || spi_imx->bits_per_word == 32)) { spi_imx->rx = spi_imx_buf_rx_swap; spi_imx->tx = spi_imx_buf_tx_swap; spi_imx->dynamic_burst = 1; } else { if (spi_imx->bits_per_word <= 8) { spi_imx->rx = spi_imx_buf_rx_u8; spi_imx->tx = spi_imx_buf_tx_u8; } else if (spi_imx->bits_per_word <= 16) { spi_imx->rx = spi_imx_buf_rx_u16; spi_imx->tx = spi_imx_buf_tx_u16; } else { spi_imx->rx = spi_imx_buf_rx_u32; spi_imx->tx = spi_imx_buf_tx_u32; } spi_imx->dynamic_burst = 0; } if (spi_imx_can_dma(spi_imx->bitbang.master, spi, t)) spi_imx->usedma = 1; else spi_imx->usedma = 0; if (is_imx53_ecspi(spi_imx) && spi_imx->slave_mode) { spi_imx->rx = mx53_ecspi_rx_slave; spi_imx->tx = mx53_ecspi_tx_slave; spi_imx->slave_burst = t->len; } spi_imx->devtype_data->prepare_transfer(spi_imx, spi, t); return 0; } static void spi_imx_sdma_exit(struct spi_imx_data *spi_imx) { struct spi_master *master = spi_imx->bitbang.master; if (master->dma_rx) { dma_release_channel(master->dma_rx); master->dma_rx = NULL; } if (master->dma_tx) { dma_release_channel(master->dma_tx); master->dma_tx = NULL; } } static int spi_imx_sdma_init(struct device *dev, struct spi_imx_data *spi_imx, struct spi_master *master) { int ret; /* use pio mode for i.mx6dl chip TKT238285 */ if (of_machine_is_compatible("fsl,imx6dl")) return 0; spi_imx->wml = spi_imx->devtype_data->fifo_size / 2; /* Prepare for TX DMA: */ master->dma_tx = dma_request_slave_channel_reason(dev, "tx"); if (IS_ERR(master->dma_tx)) { ret = PTR_ERR(master->dma_tx); dev_dbg(dev, "can't get the TX DMA channel, error %d!\n", ret); master->dma_tx = NULL; goto err; } /* Prepare for RX : */ master->dma_rx = dma_request_slave_channel_reason(dev, "rx"); if (IS_ERR(master->dma_rx)) { ret = PTR_ERR(master->dma_rx); dev_dbg(dev, "can't get the RX DMA channel, error %d\n", ret); master->dma_rx = NULL; goto err; } init_completion(&spi_imx->dma_rx_completion); init_completion(&spi_imx->dma_tx_completion); master->can_dma = spi_imx_can_dma; master->max_dma_len = MAX_SDMA_BD_BYTES; spi_imx->bitbang.master->flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX; return 0; err: spi_imx_sdma_exit(spi_imx); return ret; } static void spi_imx_dma_rx_callback(void *cookie) { struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie; complete(&spi_imx->dma_rx_completion); } static void spi_imx_dma_tx_callback(void *cookie) { struct spi_imx_data *spi_imx = (struct spi_imx_data *)cookie; complete(&spi_imx->dma_tx_completion); } static int spi_imx_calculate_timeout(struct spi_imx_data *spi_imx, int size) { unsigned long timeout = 0; /* Time with actual data transfer and CS change delay related to HW */ timeout = (8 + 4) * size / spi_imx->spi_bus_clk; /* Add extra second for scheduler related activities */ timeout += 1; /* Double calculated timeout */ return msecs_to_jiffies(2 * timeout * MSEC_PER_SEC); } static int spi_imx_dma_transfer(struct spi_imx_data *spi_imx, struct spi_transfer *transfer) { struct dma_async_tx_descriptor *desc_tx, *desc_rx; unsigned long transfer_timeout; unsigned long timeout; struct spi_master *master = spi_imx->bitbang.master; struct sg_table *tx = &transfer->tx_sg, *rx = &transfer->rx_sg; struct scatterlist *last_sg = sg_last(rx->sgl, rx->nents); unsigned int bytes_per_word, i; int ret; /* Get the right burst length from the last sg to ensure no tail data */ bytes_per_word = spi_imx_bytes_per_word(transfer->bits_per_word); for (i = spi_imx->devtype_data->fifo_size / 2; i > 0; i--) { if (!(sg_dma_len(last_sg) % (i * bytes_per_word))) break; } /* Use 1 as wml in case no available burst length got */ if (i == 0) i = 1; spi_imx->wml = i; ret = spi_imx_dma_configure(master); if (ret) return ret; if (!spi_imx->devtype_data->setup_wml) { dev_err(spi_imx->dev, "No setup_wml()?\n"); return -EINVAL; } spi_imx->devtype_data->setup_wml(spi_imx); /* * The TX DMA setup starts the transfer, so make sure RX is configured * before TX. */ desc_rx = dmaengine_prep_slave_sg(master->dma_rx, rx->sgl, rx->nents, DMA_DEV_TO_MEM, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc_rx) return -EINVAL; desc_rx->callback = spi_imx_dma_rx_callback; desc_rx->callback_param = (void *)spi_imx; dmaengine_submit(desc_rx); reinit_completion(&spi_imx->dma_rx_completion); dma_async_issue_pending(master->dma_rx); desc_tx = dmaengine_prep_slave_sg(master->dma_tx, tx->sgl, tx->nents, DMA_MEM_TO_DEV, DMA_PREP_INTERRUPT | DMA_CTRL_ACK); if (!desc_tx) { dmaengine_terminate_all(master->dma_tx); return -EINVAL; } desc_tx->callback = spi_imx_dma_tx_callback; desc_tx->callback_param = (void *)spi_imx; dmaengine_submit(desc_tx); reinit_completion(&spi_imx->dma_tx_completion); dma_async_issue_pending(master->dma_tx); transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len); /* Wait SDMA to finish the data transfer.*/ timeout = wait_for_completion_timeout(&spi_imx->dma_tx_completion, transfer_timeout); if (!timeout) { dev_err(spi_imx->dev, "I/O Error in DMA TX\n"); dmaengine_terminate_all(master->dma_tx); dmaengine_terminate_all(master->dma_rx); return -ETIMEDOUT; } timeout = wait_for_completion_timeout(&spi_imx->dma_rx_completion, transfer_timeout); if (!timeout) { dev_err(&master->dev, "I/O Error in DMA RX\n"); spi_imx->devtype_data->reset(spi_imx); dmaengine_terminate_all(master->dma_rx); return -ETIMEDOUT; } return transfer->len; } static int spi_imx_pio_transfer(struct spi_device *spi, struct spi_transfer *transfer) { struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); unsigned long transfer_timeout; unsigned long timeout; spi_imx->tx_buf = transfer->tx_buf; spi_imx->rx_buf = transfer->rx_buf; spi_imx->count = transfer->len; spi_imx->txfifo = 0; spi_imx->remainder = 0; reinit_completion(&spi_imx->xfer_done); spi_imx_push(spi_imx); spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE); transfer_timeout = spi_imx_calculate_timeout(spi_imx, transfer->len); timeout = wait_for_completion_timeout(&spi_imx->xfer_done, transfer_timeout); if (!timeout) { dev_err(&spi->dev, "I/O Error in PIO\n"); spi_imx->devtype_data->reset(spi_imx); return -ETIMEDOUT; } return transfer->len; } static int spi_imx_pio_transfer_slave(struct spi_device *spi, struct spi_transfer *transfer) { struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); int ret = transfer->len; if (is_imx53_ecspi(spi_imx) && transfer->len > MX53_MAX_TRANSFER_BYTES) { dev_err(&spi->dev, "Transaction too big, max size is %d bytes\n", MX53_MAX_TRANSFER_BYTES); return -EMSGSIZE; } spi_imx->tx_buf = transfer->tx_buf; spi_imx->rx_buf = transfer->rx_buf; spi_imx->count = transfer->len; spi_imx->txfifo = 0; spi_imx->remainder = 0; reinit_completion(&spi_imx->xfer_done); spi_imx->slave_aborted = false; spi_imx_push(spi_imx); spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE | MXC_INT_RDR); if (wait_for_completion_interruptible(&spi_imx->xfer_done) || spi_imx->slave_aborted) { dev_dbg(&spi->dev, "interrupted\n"); ret = -EINTR; } /* ecspi has a HW issue when works in Slave mode, * after 64 words writtern to TXFIFO, even TXFIFO becomes empty, * ECSPI_TXDATA keeps shift out the last word data, * so we have to disable ECSPI when in slave mode after the * transfer completes */ if (spi_imx->devtype_data->disable) spi_imx->devtype_data->disable(spi_imx); return ret; } static int spi_imx_transfer(struct spi_device *spi, struct spi_transfer *transfer) { struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); /* flush rxfifo before transfer */ while (spi_imx->devtype_data->rx_available(spi_imx)) readl(spi_imx->base + MXC_CSPIRXDATA); if (spi_imx->slave_mode) return spi_imx_pio_transfer_slave(spi, transfer); if (spi_imx->usedma) return spi_imx_dma_transfer(spi_imx, transfer); else return spi_imx_pio_transfer(spi, transfer); } static int spi_imx_setup(struct spi_device *spi) { dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__, spi->mode, spi->bits_per_word, spi->max_speed_hz); if (spi->mode & SPI_NO_CS) return 0; if (gpio_is_valid(spi->cs_gpio)) gpio_direction_output(spi->cs_gpio, spi->mode & SPI_CS_HIGH ? 0 : 1); spi_imx_chipselect(spi, BITBANG_CS_INACTIVE); return 0; } static void spi_imx_cleanup(struct spi_device *spi) { } static int spi_imx_prepare_message(struct spi_master *master, struct spi_message *msg) { struct spi_imx_data *spi_imx = spi_master_get_devdata(master); int ret; ret = clk_enable(spi_imx->clk_per); if (ret) return ret; ret = clk_enable(spi_imx->clk_ipg); if (ret) { clk_disable(spi_imx->clk_per); return ret; } ret = spi_imx->devtype_data->prepare_message(spi_imx, msg); if (ret) { clk_disable(spi_imx->clk_ipg); clk_disable(spi_imx->clk_per); } return ret; } static int spi_imx_unprepare_message(struct spi_master *master, struct spi_message *msg) { struct spi_imx_data *spi_imx = spi_master_get_devdata(master); clk_disable(spi_imx->clk_ipg); clk_disable(spi_imx->clk_per); return 0; } static int spi_imx_slave_abort(struct spi_master *master) { struct spi_imx_data *spi_imx = spi_master_get_devdata(master); spi_imx->slave_aborted = true; complete(&spi_imx->xfer_done); return 0; } static int spi_imx_probe(struct platform_device *pdev) { struct device_node *np = pdev->dev.of_node; const struct of_device_id *of_id = of_match_device(spi_imx_dt_ids, &pdev->dev); struct spi_imx_master *mxc_platform_info = dev_get_platdata(&pdev->dev); struct spi_master *master; struct spi_imx_data *spi_imx; struct resource *res; int i, ret, irq, spi_drctl; const struct spi_imx_devtype_data *devtype_data = of_id ? of_id->data : (struct spi_imx_devtype_data *)pdev->id_entry->driver_data; bool slave_mode; if (!np && !mxc_platform_info) { dev_err(&pdev->dev, "can't get the platform data\n"); return -EINVAL; } slave_mode = devtype_data->has_slavemode && of_property_read_bool(np, "spi-slave"); if (slave_mode) master = spi_alloc_slave(&pdev->dev, sizeof(struct spi_imx_data)); else master = spi_alloc_master(&pdev->dev, sizeof(struct spi_imx_data)); if (!master) return -ENOMEM; ret = of_property_read_u32(np, "fsl,spi-rdy-drctl", &spi_drctl); if ((ret < 0) || (spi_drctl >= 0x3)) { /* '11' is reserved */ spi_drctl = 0; } platform_set_drvdata(pdev, master); master->bits_per_word_mask = SPI_BPW_RANGE_MASK(1, 32); master->bus_num = np ? -1 : pdev->id; spi_imx = spi_master_get_devdata(master); spi_imx->bitbang.master = master; spi_imx->dev = &pdev->dev; spi_imx->slave_mode = slave_mode; spi_imx->devtype_data = devtype_data; /* Get number of chip selects, either platform data or OF */ if (mxc_platform_info) { master->num_chipselect = mxc_platform_info->num_chipselect; if (mxc_platform_info->chipselect) { master->cs_gpios = devm_kcalloc(&master->dev, master->num_chipselect, sizeof(int), GFP_KERNEL); if (!master->cs_gpios) return -ENOMEM; for (i = 0; i < master->num_chipselect; i++) master->cs_gpios[i] = mxc_platform_info->chipselect[i]; } } else { u32 num_cs; if (!of_property_read_u32(np, "num-cs", &num_cs)) master->num_chipselect = num_cs; /* If not preset, default value of 1 is used */ } spi_imx->bitbang.chipselect = spi_imx_chipselect; spi_imx->bitbang.setup_transfer = spi_imx_setupxfer; spi_imx->bitbang.txrx_bufs = spi_imx_transfer; spi_imx->bitbang.master->setup = spi_imx_setup; spi_imx->bitbang.master->cleanup = spi_imx_cleanup; spi_imx->bitbang.master->prepare_message = spi_imx_prepare_message; spi_imx->bitbang.master->unprepare_message = spi_imx_unprepare_message; spi_imx->bitbang.master->slave_abort = spi_imx_slave_abort; spi_imx->bitbang.master->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH \ | SPI_NO_CS; if (is_imx35_cspi(spi_imx) || is_imx51_ecspi(spi_imx) || is_imx53_ecspi(spi_imx)) spi_imx->bitbang.master->mode_bits |= SPI_LOOP | SPI_READY; spi_imx->spi_drctl = spi_drctl; init_completion(&spi_imx->xfer_done); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); spi_imx->base = devm_ioremap_resource(&pdev->dev, res); if (IS_ERR(spi_imx->base)) { ret = PTR_ERR(spi_imx->base); goto out_master_put; } spi_imx->base_phys = res->start; irq = platform_get_irq(pdev, 0); if (irq < 0) { ret = irq; goto out_master_put; } ret = devm_request_irq(&pdev->dev, irq, spi_imx_isr, 0, dev_name(&pdev->dev), spi_imx); if (ret) { dev_err(&pdev->dev, "can't get irq%d: %d\n", irq, ret); goto out_master_put; } spi_imx->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); if (IS_ERR(spi_imx->clk_ipg)) { ret = PTR_ERR(spi_imx->clk_ipg); goto out_master_put; } spi_imx->clk_per = devm_clk_get(&pdev->dev, "per"); if (IS_ERR(spi_imx->clk_per)) { ret = PTR_ERR(spi_imx->clk_per); goto out_master_put; } ret = clk_prepare_enable(spi_imx->clk_per); if (ret) goto out_master_put; ret = clk_prepare_enable(spi_imx->clk_ipg); if (ret) goto out_put_per; spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per); /* * Only validated on i.mx35 and i.mx6 now, can remove the constraint * if validated on other chips. */ if (spi_imx->devtype_data->has_dmamode) { ret = spi_imx_sdma_init(&pdev->dev, spi_imx, master); if (ret == -EPROBE_DEFER) goto out_clk_put; if (ret < 0) dev_err(&pdev->dev, "dma setup error %d, use pio\n", ret); } spi_imx->devtype_data->reset(spi_imx); spi_imx->devtype_data->intctrl(spi_imx, 0); master->dev.of_node = pdev->dev.of_node; ret = spi_bitbang_start(&spi_imx->bitbang); if (ret) { dev_err(&pdev->dev, "bitbang start failed with %d\n", ret); goto out_clk_put; } /* Request GPIO CS lines, if any */ if (!spi_imx->slave_mode && master->cs_gpios) { for (i = 0; i < master->num_chipselect; i++) { if (!gpio_is_valid(master->cs_gpios[i])) continue; ret = devm_gpio_request(&pdev->dev, master->cs_gpios[i], DRIVER_NAME); if (ret) { dev_err(&pdev->dev, "Can't get CS GPIO %i\n", master->cs_gpios[i]); goto out_spi_bitbang; } } } dev_info(&pdev->dev, "probed\n"); clk_disable(spi_imx->clk_ipg); clk_disable(spi_imx->clk_per); return ret; out_spi_bitbang: spi_bitbang_stop(&spi_imx->bitbang); out_clk_put: clk_disable_unprepare(spi_imx->clk_ipg); out_put_per: clk_disable_unprepare(spi_imx->clk_per); out_master_put: spi_master_put(master); return ret; } static int spi_imx_remove(struct platform_device *pdev) { struct spi_master *master = platform_get_drvdata(pdev); struct spi_imx_data *spi_imx = spi_master_get_devdata(master); int ret; spi_bitbang_stop(&spi_imx->bitbang); ret = clk_enable(spi_imx->clk_per); if (ret) return ret; ret = clk_enable(spi_imx->clk_ipg); if (ret) { clk_disable(spi_imx->clk_per); return ret; } writel(0, spi_imx->base + MXC_CSPICTRL); clk_disable_unprepare(spi_imx->clk_ipg); clk_disable_unprepare(spi_imx->clk_per); spi_imx_sdma_exit(spi_imx); spi_master_put(master); return 0; } static struct platform_driver spi_imx_driver = { .driver = { .name = DRIVER_NAME, .of_match_table = spi_imx_dt_ids, }, .id_table = spi_imx_devtype, .probe = spi_imx_probe, .remove = spi_imx_remove, }; module_platform_driver(spi_imx_driver); MODULE_DESCRIPTION("SPI Controller driver"); MODULE_AUTHOR("Sascha Hauer, Pengutronix"); MODULE_LICENSE("GPL"); MODULE_ALIAS("platform:" DRIVER_NAME);
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