| /* |
| * Copyright 2004-2007 Freescale Semiconductor, Inc. All Rights Reserved. |
| * Copyright (C) 2008 Juergen Beisert |
| * |
| * 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 |
| * 51 Franklin Street, Fifth Floor |
| * Boston, MA 02110-1301, USA. |
| */ |
| |
| #include <linux/clk.h> |
| #include <linux/completion.h> |
| #include <linux/delay.h> |
| #include <linux/err.h> |
| #include <linux/gpio.h> |
| #include <linux/init.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 <mach/spi.h> |
| |
| #define DRIVER_NAME "spi_imx" |
| |
| #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 */ |
| |
| struct spi_imx_config { |
| unsigned int speed_hz; |
| unsigned int bpw; |
| unsigned int mode; |
| u8 cs; |
| }; |
| |
| 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 and later */ |
| }; |
| |
| struct spi_imx_data; |
| |
| struct spi_imx_devtype_data { |
| void (*intctrl)(struct spi_imx_data *, int); |
| int (*config)(struct spi_imx_data *, struct spi_imx_config *); |
| void (*trigger)(struct spi_imx_data *); |
| int (*rx_available)(struct spi_imx_data *); |
| void (*reset)(struct spi_imx_data *); |
| enum spi_imx_devtype devtype; |
| }; |
| |
| struct spi_imx_data { |
| struct spi_bitbang bitbang; |
| |
| struct completion xfer_done; |
| void __iomem *base; |
| int irq; |
| struct clk *clk_per; |
| struct clk *clk_ipg; |
| unsigned long spi_clk; |
| |
| unsigned int count; |
| 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 */ |
| |
| struct spi_imx_devtype_data *devtype_data; |
| int chipselect[0]; |
| }; |
| |
| 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 unsigned spi_imx_get_fifosize(struct spi_imx_data *d) |
| { |
| return (d->devtype_data->devtype == IMX51_ECSPI) ? 64 : 8; |
| } |
| |
| #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); \ |
| } \ |
| } |
| |
| #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) |
| { |
| int i; |
| |
| for (i = 2; i < max; i++) |
| if (fspi * mxc_clkdivs[i] >= fin) |
| return i; |
| |
| return max; |
| } |
| |
| /* MX1, MX31, MX35, MX51 CSPI */ |
| static unsigned int spi_imx_clkdiv_2(unsigned int fin, |
| unsigned int fspi) |
| { |
| int i, div = 4; |
| |
| for (i = 0; i < 7; i++) { |
| if (fspi * div >= fin) |
| return i; |
| div <<= 1; |
| } |
| |
| return 7; |
| } |
| |
| #define MX51_ECSPI_CTRL 0x08 |
| #define MX51_ECSPI_CTRL_ENABLE (1 << 0) |
| #define MX51_ECSPI_CTRL_XCH (1 << 2) |
| #define MX51_ECSPI_CTRL_MODE_MASK (0xf << 4) |
| #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_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_INT 0x10 |
| #define MX51_ECSPI_INT_TEEN (1 << 0) |
| #define MX51_ECSPI_INT_RREN (1 << 3) |
| |
| #define MX51_ECSPI_STAT 0x18 |
| #define MX51_ECSPI_STAT_RR (1 << 3) |
| |
| /* MX51 eCSPI */ |
| static unsigned int mx51_ecspi_clkdiv(unsigned int fin, unsigned int fspi) |
| { |
| /* |
| * there are two 4-bit dividers, the pre-divider divides by |
| * $pre, the post-divider by 2^$post |
| */ |
| unsigned int pre, post; |
| |
| 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)) { |
| pr_err("%s: cannot set clock freq: %u (base freq: %u)\n", |
| __func__, fspi, fin); |
| return 0xff; |
| } |
| |
| pre = DIV_ROUND_UP(fin, fspi << post) - 1; |
| |
| pr_debug("%s: fin: %u, fspi: %u, post: %u, pre: %u\n", |
| __func__, fin, fspi, post, pre); |
| return (pre << MX51_ECSPI_CTRL_PREDIV_OFFSET) | |
| (post << MX51_ECSPI_CTRL_POSTDIV_OFFSET); |
| } |
| |
| static void __maybe_unused 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; |
| |
| writel(val, spi_imx->base + MX51_ECSPI_INT); |
| } |
| |
| static void __maybe_unused 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 int __maybe_unused mx51_ecspi_config(struct spi_imx_data *spi_imx, |
| struct spi_imx_config *config) |
| { |
| u32 ctrl = MX51_ECSPI_CTRL_ENABLE, cfg = 0; |
| |
| /* |
| * The hardware seems to have a race condition when changing modes. The |
| * current assumption is that the selection of the channel arrives |
| * earlier in the hardware than the mode bits when they are written at |
| * the same time. |
| * So set master mode for all channels as we do not support slave mode. |
| */ |
| ctrl |= MX51_ECSPI_CTRL_MODE_MASK; |
| |
| /* set clock speed */ |
| ctrl |= mx51_ecspi_clkdiv(spi_imx->spi_clk, config->speed_hz); |
| |
| /* set chip select to use */ |
| ctrl |= MX51_ECSPI_CTRL_CS(config->cs); |
| |
| ctrl |= (config->bpw - 1) << MX51_ECSPI_CTRL_BL_OFFSET; |
| |
| cfg |= MX51_ECSPI_CONFIG_SBBCTRL(config->cs); |
| |
| if (config->mode & SPI_CPHA) |
| cfg |= MX51_ECSPI_CONFIG_SCLKPHA(config->cs); |
| |
| if (config->mode & SPI_CPOL) |
| cfg |= MX51_ECSPI_CONFIG_SCLKPOL(config->cs); |
| |
| if (config->mode & SPI_CS_HIGH) |
| cfg |= MX51_ECSPI_CONFIG_SSBPOL(config->cs); |
| |
| writel(ctrl, spi_imx->base + MX51_ECSPI_CTRL); |
| writel(cfg, spi_imx->base + MX51_ECSPI_CONFIG); |
| |
| return 0; |
| } |
| |
| static int __maybe_unused mx51_ecspi_rx_available(struct spi_imx_data *spi_imx) |
| { |
| return readl(spi_imx->base + MX51_ECSPI_STAT) & MX51_ECSPI_STAT_RR; |
| } |
| |
| static void __maybe_unused 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_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_CSPISTATUS 0x14 |
| #define MX31_STATUS_RR (1 << 3) |
| |
| /* 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 __maybe_unused 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 __maybe_unused 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 __maybe_unused mx31_config(struct spi_imx_data *spi_imx, |
| struct spi_imx_config *config) |
| { |
| unsigned int reg = MX31_CSPICTRL_ENABLE | MX31_CSPICTRL_MASTER; |
| int cs = spi_imx->chipselect[config->cs]; |
| |
| reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) << |
| MX31_CSPICTRL_DR_SHIFT; |
| |
| if (is_imx35_cspi(spi_imx)) { |
| reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT; |
| reg |= MX31_CSPICTRL_SSCTL; |
| } else { |
| reg |= (config->bpw - 1) << MX31_CSPICTRL_BC_SHIFT; |
| } |
| |
| if (config->mode & SPI_CPHA) |
| reg |= MX31_CSPICTRL_PHA; |
| if (config->mode & SPI_CPOL) |
| reg |= MX31_CSPICTRL_POL; |
| if (config->mode & SPI_CS_HIGH) |
| reg |= MX31_CSPICTRL_SSPOL; |
| if (cs < 0) |
| reg |= (cs + 32) << |
| (is_imx35_cspi(spi_imx) ? MX35_CSPICTRL_CS_SHIFT : |
| MX31_CSPICTRL_CS_SHIFT); |
| |
| writel(reg, spi_imx->base + MXC_CSPICTRL); |
| |
| return 0; |
| } |
| |
| static int __maybe_unused mx31_rx_available(struct spi_imx_data *spi_imx) |
| { |
| return readl(spi_imx->base + MX31_CSPISTATUS) & MX31_STATUS_RR; |
| } |
| |
| static void __maybe_unused 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 __maybe_unused 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 __maybe_unused 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 __maybe_unused mx21_config(struct spi_imx_data *spi_imx, |
| struct spi_imx_config *config) |
| { |
| unsigned int reg = MX21_CSPICTRL_ENABLE | MX21_CSPICTRL_MASTER; |
| int cs = spi_imx->chipselect[config->cs]; |
| unsigned int max = is_imx27_cspi(spi_imx) ? 16 : 18; |
| |
| reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz, max) << |
| MX21_CSPICTRL_DR_SHIFT; |
| reg |= config->bpw - 1; |
| |
| if (config->mode & SPI_CPHA) |
| reg |= MX21_CSPICTRL_PHA; |
| if (config->mode & SPI_CPOL) |
| reg |= MX21_CSPICTRL_POL; |
| if (config->mode & SPI_CS_HIGH) |
| reg |= MX21_CSPICTRL_SSPOL; |
| if (cs < 0) |
| reg |= (cs + 32) << MX21_CSPICTRL_CS_SHIFT; |
| |
| writel(reg, spi_imx->base + MXC_CSPICTRL); |
| |
| return 0; |
| } |
| |
| static int __maybe_unused mx21_rx_available(struct spi_imx_data *spi_imx) |
| { |
| return readl(spi_imx->base + MXC_CSPIINT) & MX21_INTREG_RR; |
| } |
| |
| static void __maybe_unused 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 __maybe_unused 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 __maybe_unused 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 __maybe_unused mx1_config(struct spi_imx_data *spi_imx, |
| struct spi_imx_config *config) |
| { |
| unsigned int reg = MX1_CSPICTRL_ENABLE | MX1_CSPICTRL_MASTER; |
| |
| reg |= spi_imx_clkdiv_2(spi_imx->spi_clk, config->speed_hz) << |
| MX1_CSPICTRL_DR_SHIFT; |
| reg |= config->bpw - 1; |
| |
| if (config->mode & SPI_CPHA) |
| reg |= MX1_CSPICTRL_PHA; |
| if (config->mode & SPI_CPOL) |
| reg |= MX1_CSPICTRL_POL; |
| |
| writel(reg, spi_imx->base + MXC_CSPICTRL); |
| |
| return 0; |
| } |
| |
| static int __maybe_unused mx1_rx_available(struct spi_imx_data *spi_imx) |
| { |
| return readl(spi_imx->base + MXC_CSPIINT) & MX1_INTREG_RR; |
| } |
| |
| static void __maybe_unused 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, |
| .config = mx1_config, |
| .trigger = mx1_trigger, |
| .rx_available = mx1_rx_available, |
| .reset = mx1_reset, |
| .devtype = IMX1_CSPI, |
| }; |
| |
| static struct spi_imx_devtype_data imx21_cspi_devtype_data = { |
| .intctrl = mx21_intctrl, |
| .config = mx21_config, |
| .trigger = mx21_trigger, |
| .rx_available = mx21_rx_available, |
| .reset = mx21_reset, |
| .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, |
| .config = mx21_config, |
| .trigger = mx21_trigger, |
| .rx_available = mx21_rx_available, |
| .reset = mx21_reset, |
| .devtype = IMX27_CSPI, |
| }; |
| |
| static struct spi_imx_devtype_data imx31_cspi_devtype_data = { |
| .intctrl = mx31_intctrl, |
| .config = mx31_config, |
| .trigger = mx31_trigger, |
| .rx_available = mx31_rx_available, |
| .reset = mx31_reset, |
| .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, |
| .config = mx31_config, |
| .trigger = mx31_trigger, |
| .rx_available = mx31_rx_available, |
| .reset = mx31_reset, |
| .devtype = IMX35_CSPI, |
| }; |
| |
| static struct spi_imx_devtype_data imx51_ecspi_devtype_data = { |
| .intctrl = mx51_ecspi_intctrl, |
| .config = mx51_ecspi_config, |
| .trigger = mx51_ecspi_trigger, |
| .rx_available = mx51_ecspi_rx_available, |
| .reset = mx51_ecspi_reset, |
| .devtype = IMX51_ECSPI, |
| }; |
| |
| static 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, |
| }, { |
| /* 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, }, |
| { /* sentinel */ } |
| }; |
| |
| static void spi_imx_chipselect(struct spi_device *spi, int is_active) |
| { |
| struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); |
| int gpio = spi_imx->chipselect[spi->chip_select]; |
| int active = is_active != BITBANG_CS_INACTIVE; |
| int dev_is_lowactive = !(spi->mode & SPI_CS_HIGH); |
| |
| if (gpio < 0) |
| return; |
| |
| gpio_set_value(gpio, dev_is_lowactive ^ active); |
| } |
| |
| static void spi_imx_push(struct spi_imx_data *spi_imx) |
| { |
| while (spi_imx->txfifo < spi_imx_get_fifosize(spi_imx)) { |
| if (!spi_imx->count) |
| break; |
| spi_imx->tx(spi_imx); |
| spi_imx->txfifo++; |
| } |
| |
| 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->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_setupxfer(struct spi_device *spi, |
| struct spi_transfer *t) |
| { |
| struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); |
| struct spi_imx_config config; |
| |
| config.bpw = t ? t->bits_per_word : spi->bits_per_word; |
| config.speed_hz = t ? t->speed_hz : spi->max_speed_hz; |
| config.mode = spi->mode; |
| config.cs = spi->chip_select; |
| |
| if (!config.speed_hz) |
| config.speed_hz = spi->max_speed_hz; |
| if (!config.bpw) |
| config.bpw = spi->bits_per_word; |
| if (!config.speed_hz) |
| config.speed_hz = spi->max_speed_hz; |
| |
| /* Initialize the functions for transfer */ |
| if (config.bpw <= 8) { |
| spi_imx->rx = spi_imx_buf_rx_u8; |
| spi_imx->tx = spi_imx_buf_tx_u8; |
| } else if (config.bpw <= 16) { |
| spi_imx->rx = spi_imx_buf_rx_u16; |
| spi_imx->tx = spi_imx_buf_tx_u16; |
| } else if (config.bpw <= 32) { |
| spi_imx->rx = spi_imx_buf_rx_u32; |
| spi_imx->tx = spi_imx_buf_tx_u32; |
| } else |
| BUG(); |
| |
| spi_imx->devtype_data->config(spi_imx, &config); |
| |
| return 0; |
| } |
| |
| 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); |
| |
| spi_imx->tx_buf = transfer->tx_buf; |
| spi_imx->rx_buf = transfer->rx_buf; |
| spi_imx->count = transfer->len; |
| spi_imx->txfifo = 0; |
| |
| init_completion(&spi_imx->xfer_done); |
| |
| spi_imx_push(spi_imx); |
| |
| spi_imx->devtype_data->intctrl(spi_imx, MXC_INT_TE); |
| |
| wait_for_completion(&spi_imx->xfer_done); |
| |
| return transfer->len; |
| } |
| |
| static int spi_imx_setup(struct spi_device *spi) |
| { |
| struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master); |
| int gpio = spi_imx->chipselect[spi->chip_select]; |
| |
| dev_dbg(&spi->dev, "%s: mode %d, %u bpw, %d hz\n", __func__, |
| spi->mode, spi->bits_per_word, spi->max_speed_hz); |
| |
| if (gpio >= 0) |
| gpio_direction_output(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 __devinit 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, num_cs; |
| |
| if (!np && !mxc_platform_info) { |
| dev_err(&pdev->dev, "can't get the platform data\n"); |
| return -EINVAL; |
| } |
| |
| ret = of_property_read_u32(np, "fsl,spi-num-chipselects", &num_cs); |
| if (ret < 0) { |
| if (mxc_platform_info) |
| num_cs = mxc_platform_info->num_chipselect; |
| else |
| return ret; |
| } |
| |
| master = spi_alloc_master(&pdev->dev, |
| sizeof(struct spi_imx_data) + sizeof(int) * num_cs); |
| if (!master) |
| return -ENOMEM; |
| |
| platform_set_drvdata(pdev, master); |
| |
| master->bus_num = pdev->id; |
| master->num_chipselect = num_cs; |
| |
| spi_imx = spi_master_get_devdata(master); |
| spi_imx->bitbang.master = spi_master_get(master); |
| |
| for (i = 0; i < master->num_chipselect; i++) { |
| int cs_gpio = of_get_named_gpio(np, "cs-gpios", i); |
| if (cs_gpio < 0 && mxc_platform_info) |
| cs_gpio = mxc_platform_info->chipselect[i]; |
| |
| spi_imx->chipselect[i] = cs_gpio; |
| if (cs_gpio < 0) |
| continue; |
| |
| ret = gpio_request(spi_imx->chipselect[i], DRIVER_NAME); |
| if (ret) { |
| dev_err(&pdev->dev, "can't get cs gpios\n"); |
| goto out_gpio_free; |
| } |
| } |
| |
| 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->mode_bits = SPI_CPOL | SPI_CPHA | SPI_CS_HIGH; |
| |
| init_completion(&spi_imx->xfer_done); |
| |
| spi_imx->devtype_data = of_id ? of_id->data : |
| (struct spi_imx_devtype_data *) pdev->id_entry->driver_data; |
| |
| res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| if (!res) { |
| dev_err(&pdev->dev, "can't get platform resource\n"); |
| ret = -ENOMEM; |
| goto out_gpio_free; |
| } |
| |
| if (!request_mem_region(res->start, resource_size(res), pdev->name)) { |
| dev_err(&pdev->dev, "request_mem_region failed\n"); |
| ret = -EBUSY; |
| goto out_gpio_free; |
| } |
| |
| spi_imx->base = ioremap(res->start, resource_size(res)); |
| if (!spi_imx->base) { |
| ret = -EINVAL; |
| goto out_release_mem; |
| } |
| |
| spi_imx->irq = platform_get_irq(pdev, 0); |
| if (spi_imx->irq < 0) { |
| ret = -EINVAL; |
| goto out_iounmap; |
| } |
| |
| ret = request_irq(spi_imx->irq, spi_imx_isr, 0, DRIVER_NAME, spi_imx); |
| if (ret) { |
| dev_err(&pdev->dev, "can't get irq%d: %d\n", spi_imx->irq, ret); |
| goto out_iounmap; |
| } |
| |
| 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_free_irq; |
| } |
| |
| 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_free_irq; |
| } |
| |
| clk_prepare_enable(spi_imx->clk_per); |
| clk_prepare_enable(spi_imx->clk_ipg); |
| |
| spi_imx->spi_clk = clk_get_rate(spi_imx->clk_per); |
| |
| 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; |
| } |
| |
| dev_info(&pdev->dev, "probed\n"); |
| |
| return ret; |
| |
| out_clk_put: |
| clk_disable_unprepare(spi_imx->clk_per); |
| clk_disable_unprepare(spi_imx->clk_ipg); |
| out_free_irq: |
| free_irq(spi_imx->irq, spi_imx); |
| out_iounmap: |
| iounmap(spi_imx->base); |
| out_release_mem: |
| release_mem_region(res->start, resource_size(res)); |
| out_gpio_free: |
| while (--i >= 0) { |
| if (spi_imx->chipselect[i] >= 0) |
| gpio_free(spi_imx->chipselect[i]); |
| } |
| spi_master_put(master); |
| kfree(master); |
| platform_set_drvdata(pdev, NULL); |
| return ret; |
| } |
| |
| static int __devexit spi_imx_remove(struct platform_device *pdev) |
| { |
| struct spi_master *master = platform_get_drvdata(pdev); |
| struct resource *res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
| struct spi_imx_data *spi_imx = spi_master_get_devdata(master); |
| int i; |
| |
| spi_bitbang_stop(&spi_imx->bitbang); |
| |
| writel(0, spi_imx->base + MXC_CSPICTRL); |
| clk_disable_unprepare(spi_imx->clk_per); |
| clk_disable_unprepare(spi_imx->clk_ipg); |
| free_irq(spi_imx->irq, spi_imx); |
| iounmap(spi_imx->base); |
| |
| for (i = 0; i < master->num_chipselect; i++) |
| if (spi_imx->chipselect[i] >= 0) |
| gpio_free(spi_imx->chipselect[i]); |
| |
| spi_master_put(master); |
| |
| release_mem_region(res->start, resource_size(res)); |
| |
| platform_set_drvdata(pdev, NULL); |
| |
| return 0; |
| } |
| |
| static struct platform_driver spi_imx_driver = { |
| .driver = { |
| .name = DRIVER_NAME, |
| .owner = THIS_MODULE, |
| .of_match_table = spi_imx_dt_ids, |
| }, |
| .id_table = spi_imx_devtype, |
| .probe = spi_imx_probe, |
| .remove = __devexit_p(spi_imx_remove), |
| }; |
| module_platform_driver(spi_imx_driver); |
| |
| MODULE_DESCRIPTION("SPI Master Controller driver"); |
| MODULE_AUTHOR("Sascha Hauer, Pengutronix"); |
| MODULE_LICENSE("GPL"); |