unsigned int speed_hz;
unsigned int bpw;
unsigned int mode;
- int cs;
+ u8 cs;
+};
+
+enum spi_imx_devtype {
+ SPI_IMX_VER_IMX1,
+ SPI_IMX_VER_0_0,
+ SPI_IMX_VER_0_4,
+ SPI_IMX_VER_0_5,
+ SPI_IMX_VER_0_7,
+ SPI_IMX_VER_2_3,
+};
+
+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 *);
+ unsigned int fifosize;
};
struct spi_imx_data {
const void *tx_buf;
unsigned int txfifo; /* number of words pushed in tx FIFO */
- /* SoC specific functions */
- 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 *);
+ struct spi_imx_devtype_data devtype_data;
};
#define MXC_SPI_BUF_RX(type) \
return max;
}
-/* MX1, MX31, MX35 */
+/* MX1, MX31, MX35, MX51 CSPI */
static unsigned int spi_imx_clkdiv_2(unsigned int fin,
unsigned int fspi)
{
return 7;
}
+#define SPI_IMX2_3_CTRL 0x08
+#define SPI_IMX2_3_CTRL_ENABLE (1 << 0)
+#define SPI_IMX2_3_CTRL_XCH (1 << 2)
+#define SPI_IMX2_3_CTRL_MODE(cs) (1 << ((cs) + 4))
+#define SPI_IMX2_3_CTRL_POSTDIV_OFFSET 8
+#define SPI_IMX2_3_CTRL_PREDIV_OFFSET 12
+#define SPI_IMX2_3_CTRL_CS(cs) ((cs) << 18)
+#define SPI_IMX2_3_CTRL_BL_OFFSET 20
+
+#define SPI_IMX2_3_CONFIG 0x0c
+#define SPI_IMX2_3_CONFIG_SCLKPHA(cs) (1 << ((cs) + 0))
+#define SPI_IMX2_3_CONFIG_SCLKPOL(cs) (1 << ((cs) + 4))
+#define SPI_IMX2_3_CONFIG_SBBCTRL(cs) (1 << ((cs) + 8))
+#define SPI_IMX2_3_CONFIG_SSBPOL(cs) (1 << ((cs) + 12))
+
+#define SPI_IMX2_3_INT 0x10
+#define SPI_IMX2_3_INT_TEEN (1 << 0)
+#define SPI_IMX2_3_INT_RREN (1 << 3)
+
+#define SPI_IMX2_3_STAT 0x18
+#define SPI_IMX2_3_STAT_RR (1 << 3)
+
+/* MX51 eCSPI */
+static unsigned int spi_imx2_3_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 << SPI_IMX2_3_CTRL_PREDIV_OFFSET) |
+ (post << SPI_IMX2_3_CTRL_POSTDIV_OFFSET);
+}
+
+static void __maybe_unused spi_imx2_3_intctrl(struct spi_imx_data *spi_imx, int enable)
+{
+ unsigned val = 0;
+
+ if (enable & MXC_INT_TE)
+ val |= SPI_IMX2_3_INT_TEEN;
+
+ if (enable & MXC_INT_RR)
+ val |= SPI_IMX2_3_INT_RREN;
+
+ writel(val, spi_imx->base + SPI_IMX2_3_INT);
+}
+
+static void __maybe_unused spi_imx2_3_trigger(struct spi_imx_data *spi_imx)
+{
+ u32 reg;
+
+ reg = readl(spi_imx->base + SPI_IMX2_3_CTRL);
+ reg |= SPI_IMX2_3_CTRL_XCH;
+ writel(reg, spi_imx->base + SPI_IMX2_3_CTRL);
+}
+
+static int __maybe_unused spi_imx2_3_config(struct spi_imx_data *spi_imx,
+ struct spi_imx_config *config)
+{
+ u32 ctrl = SPI_IMX2_3_CTRL_ENABLE, cfg = 0;
+
+ /* set master mode */
+ ctrl |= SPI_IMX2_3_CTRL_MODE(config->cs);
+
+ /* set clock speed */
+ ctrl |= spi_imx2_3_clkdiv(spi_imx->spi_clk, config->speed_hz);
+
+ /* set chip select to use */
+ ctrl |= SPI_IMX2_3_CTRL_CS(config->cs);
+
+ ctrl |= (config->bpw - 1) << SPI_IMX2_3_CTRL_BL_OFFSET;
+
+ cfg |= SPI_IMX2_3_CONFIG_SBBCTRL(config->cs);
+
+ if (config->mode & SPI_CPHA)
+ cfg |= SPI_IMX2_3_CONFIG_SCLKPHA(config->cs);
+
+ if (config->mode & SPI_CPOL)
+ cfg |= SPI_IMX2_3_CONFIG_SCLKPOL(config->cs);
+
+ if (config->mode & SPI_CS_HIGH)
+ cfg |= SPI_IMX2_3_CONFIG_SSBPOL(config->cs);
+
+ writel(ctrl, spi_imx->base + SPI_IMX2_3_CTRL);
+ writel(cfg, spi_imx->base + SPI_IMX2_3_CONFIG);
+
+ return 0;
+}
+
+static int __maybe_unused spi_imx2_3_rx_available(struct spi_imx_data *spi_imx)
+{
+ return readl(spi_imx->base + SPI_IMX2_3_STAT) & SPI_IMX2_3_STAT_RR;
+}
+
+static void __maybe_unused spi_imx2_3_reset(struct spi_imx_data *spi_imx)
+{
+ /* drain receive buffer */
+ while (spi_imx2_3_rx_available(spi_imx))
+ readl(spi_imx->base + MXC_CSPIRXDATA);
+}
+
#define MX31_INTREG_TEEN (1 << 0)
#define MX31_INTREG_RREN (1 << 3)
* 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)
+static void __maybe_unused mx31_intctrl(struct spi_imx_data *spi_imx, int enable)
{
unsigned int val = 0;
writel(val, spi_imx->base + MXC_CSPIINT);
}
-static void mx31_trigger(struct spi_imx_data *spi_imx)
+static void __maybe_unused mx31_trigger(struct spi_imx_data *spi_imx)
{
unsigned int reg;
writel(reg, spi_imx->base + MXC_CSPICTRL);
}
-static int mx31_config(struct spi_imx_data *spi_imx,
+static int __maybe_unused spi_imx0_4_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 (cpu_is_mx31())
- reg |= (config->bpw - 1) << MX31_CSPICTRL_BC_SHIFT;
- else if (cpu_is_mx25() || cpu_is_mx35()) {
- reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT;
- reg |= MX31_CSPICTRL_SSCTL;
- }
+ reg |= (config->bpw - 1) << MX31_CSPICTRL_BC_SHIFT;
if (config->mode & SPI_CPHA)
reg |= MX31_CSPICTRL_PHA;
reg |= MX31_CSPICTRL_POL;
if (config->mode & SPI_CS_HIGH)
reg |= MX31_CSPICTRL_SSPOL;
- if (config->cs < 0) {
- if (cpu_is_mx31())
- reg |= (config->cs + 32) << MX31_CSPICTRL_CS_SHIFT;
- else if (cpu_is_mx25() || cpu_is_mx35())
- reg |= (config->cs + 32) << MX35_CSPICTRL_CS_SHIFT;
- }
+ if (cs < 0)
+ reg |= (cs + 32) << MX31_CSPICTRL_CS_SHIFT;
+
+ writel(reg, spi_imx->base + MXC_CSPICTRL);
+
+ return 0;
+}
+
+static int __maybe_unused spi_imx0_7_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;
+
+ reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT;
+ reg |= MX31_CSPICTRL_SSCTL;
+
+ 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) << MX35_CSPICTRL_CS_SHIFT;
writel(reg, spi_imx->base + MXC_CSPICTRL);
return 0;
}
-static int mx31_rx_available(struct spi_imx_data *spi_imx)
+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 spi_imx0_4_reset(struct spi_imx_data *spi_imx)
+{
+ /* drain receive buffer */
+ while (readl(spi_imx->base + MX3_CSPISTAT) & MX3_CSPISTAT_RR)
+ readl(spi_imx->base + MXC_CSPIRXDATA);
+}
+
#define MX27_INTREG_RR (1 << 4)
#define MX27_INTREG_TEEN (1 << 9)
#define MX27_INTREG_RREN (1 << 13)
#define MX27_CSPICTRL_DR_SHIFT 14
#define MX27_CSPICTRL_CS_SHIFT 19
-static void mx27_intctrl(struct spi_imx_data *spi_imx, int enable)
+static void __maybe_unused mx27_intctrl(struct spi_imx_data *spi_imx, int enable)
{
unsigned int val = 0;
writel(val, spi_imx->base + MXC_CSPIINT);
}
-static void mx27_trigger(struct spi_imx_data *spi_imx)
+static void __maybe_unused mx27_trigger(struct spi_imx_data *spi_imx)
{
unsigned int reg;
writel(reg, spi_imx->base + MXC_CSPICTRL);
}
-static int mx27_config(struct spi_imx_data *spi_imx,
+static int __maybe_unused mx27_config(struct spi_imx_data *spi_imx,
struct spi_imx_config *config)
{
unsigned int reg = MX27_CSPICTRL_ENABLE | MX27_CSPICTRL_MASTER;
+ int cs = spi_imx->chipselect[config->cs];
reg |= spi_imx_clkdiv_1(spi_imx->spi_clk, config->speed_hz) <<
MX27_CSPICTRL_DR_SHIFT;
reg |= MX27_CSPICTRL_POL;
if (config->mode & SPI_CS_HIGH)
reg |= MX27_CSPICTRL_SSPOL;
- if (config->cs < 0)
- reg |= (config->cs + 32) << MX27_CSPICTRL_CS_SHIFT;
+ if (cs < 0)
+ reg |= (cs + 32) << MX27_CSPICTRL_CS_SHIFT;
writel(reg, spi_imx->base + MXC_CSPICTRL);
return 0;
}
-static int mx27_rx_available(struct spi_imx_data *spi_imx)
+static int __maybe_unused mx27_rx_available(struct spi_imx_data *spi_imx)
{
return readl(spi_imx->base + MXC_CSPIINT) & MX27_INTREG_RR;
}
+static void __maybe_unused spi_imx0_0_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_MASTER (1 << 10)
#define MX1_CSPICTRL_DR_SHIFT 13
-static void mx1_intctrl(struct spi_imx_data *spi_imx, int enable)
+static void __maybe_unused mx1_intctrl(struct spi_imx_data *spi_imx, int enable)
{
unsigned int val = 0;
writel(val, spi_imx->base + MXC_CSPIINT);
}
-static void mx1_trigger(struct spi_imx_data *spi_imx)
+static void __maybe_unused mx1_trigger(struct spi_imx_data *spi_imx)
{
unsigned int reg;
writel(reg, spi_imx->base + MXC_CSPICTRL);
}
-static int mx1_config(struct spi_imx_data *spi_imx,
+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;
return 0;
}
-static int mx1_rx_available(struct spi_imx_data *spi_imx)
+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);
+}
+
+/*
+ * These version numbers are taken from the Freescale driver. Unfortunately it
+ * doesn't support i.MX1, so this entry doesn't match the scheme. :-(
+ */
+static struct spi_imx_devtype_data spi_imx_devtype_data[] __devinitdata = {
+#ifdef CONFIG_SPI_IMX_VER_IMX1
+ [SPI_IMX_VER_IMX1] = {
+ .intctrl = mx1_intctrl,
+ .config = mx1_config,
+ .trigger = mx1_trigger,
+ .rx_available = mx1_rx_available,
+ .reset = mx1_reset,
+ .fifosize = 8,
+ },
+#endif
+#ifdef CONFIG_SPI_IMX_VER_0_0
+ [SPI_IMX_VER_0_0] = {
+ .intctrl = mx27_intctrl,
+ .config = mx27_config,
+ .trigger = mx27_trigger,
+ .rx_available = mx27_rx_available,
+ .reset = spi_imx0_0_reset,
+ .fifosize = 8,
+ },
+#endif
+#ifdef CONFIG_SPI_IMX_VER_0_4
+ [SPI_IMX_VER_0_4] = {
+ .intctrl = mx31_intctrl,
+ .config = spi_imx0_4_config,
+ .trigger = mx31_trigger,
+ .rx_available = mx31_rx_available,
+ .reset = spi_imx0_4_reset,
+ .fifosize = 8,
+ },
+#endif
+#ifdef CONFIG_SPI_IMX_VER_0_7
+ [SPI_IMX_VER_0_7] = {
+ .intctrl = mx31_intctrl,
+ .config = spi_imx0_7_config,
+ .trigger = mx31_trigger,
+ .rx_available = mx31_rx_available,
+ .reset = spi_imx0_4_reset,
+ .fifosize = 8,
+ },
+#endif
+#ifdef CONFIG_SPI_IMX_VER_2_3
+ [SPI_IMX_VER_2_3] = {
+ .intctrl = spi_imx2_3_intctrl,
+ .config = spi_imx2_3_config,
+ .trigger = spi_imx2_3_trigger,
+ .rx_available = spi_imx2_3_rx_available,
+ .reset = spi_imx2_3_reset,
+ .fifosize = 64,
+ },
+#endif
+};
+
static void spi_imx_chipselect(struct spi_device *spi, int is_active)
{
struct spi_imx_data *spi_imx = spi_master_get_devdata(spi->master);
static void spi_imx_push(struct spi_imx_data *spi_imx)
{
- while (spi_imx->txfifo < 8) {
+ while (spi_imx->txfifo < spi_imx->devtype_data.fifosize) {
if (!spi_imx->count)
break;
spi_imx->tx(spi_imx);
spi_imx->txfifo++;
}
- spi_imx->trigger(spi_imx);
+ 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->rx_available(spi_imx)) {
+ while (spi_imx->devtype_data.rx_available(spi_imx)) {
spi_imx->rx(spi_imx);
spi_imx->txfifo--;
}
/* No data left to push, but still waiting for rx data,
* enable receive data available interrupt.
*/
- spi_imx->intctrl(spi_imx, MXC_INT_RR);
+ spi_imx->devtype_data.intctrl(
+ spi_imx, MXC_INT_RR);
return IRQ_HANDLED;
}
- spi_imx->intctrl(spi_imx, 0);
+ spi_imx->devtype_data.intctrl(spi_imx, 0);
complete(&spi_imx->xfer_done);
return IRQ_HANDLED;
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_imx->chipselect[spi->chip_select];
+ config.cs = spi->chip_select;
if (!config.speed_hz)
config.speed_hz = spi->max_speed_hz;
} else
BUG();
- spi_imx->config(spi_imx, &config);
+ spi_imx->devtype_data.config(spi_imx, &config);
return 0;
}
spi_imx_push(spi_imx);
- spi_imx->intctrl(spi_imx, MXC_INT_TE);
+ spi_imx->devtype_data.intctrl(spi_imx, MXC_INT_TE);
wait_for_completion(&spi_imx->xfer_done);
{
}
+static struct platform_device_id spi_imx_devtype[] = {
+ {
+ .name = "imx1-cspi",
+ .driver_data = SPI_IMX_VER_IMX1,
+ }, {
+ .name = "imx21-cspi",
+ .driver_data = SPI_IMX_VER_0_0,
+ }, {
+ .name = "imx25-cspi",
+ .driver_data = SPI_IMX_VER_0_7,
+ }, {
+ .name = "imx27-cspi",
+ .driver_data = SPI_IMX_VER_0_0,
+ }, {
+ .name = "imx31-cspi",
+ .driver_data = SPI_IMX_VER_0_4,
+ }, {
+ .name = "imx35-cspi",
+ .driver_data = SPI_IMX_VER_0_7,
+ }, {
+ .name = "imx51-cspi",
+ .driver_data = SPI_IMX_VER_0_7,
+ }, {
+ .name = "imx51-ecspi",
+ .driver_data = SPI_IMX_VER_2_3,
+ }, {
+ /* sentinel */
+ }
+};
+
static int __devinit spi_imx_probe(struct platform_device *pdev)
{
struct spi_imx_master *mxc_platform_info;
init_completion(&spi_imx->xfer_done);
+ spi_imx->devtype_data =
+ 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");
}
spi_imx->irq = platform_get_irq(pdev, 0);
- if (spi_imx->irq <= 0) {
+ if (spi_imx->irq < 0) {
ret = -EINVAL;
goto out_iounmap;
}
goto out_iounmap;
}
- if (cpu_is_mx25() || cpu_is_mx31() || cpu_is_mx35()) {
- spi_imx->intctrl = mx31_intctrl;
- spi_imx->config = mx31_config;
- spi_imx->trigger = mx31_trigger;
- spi_imx->rx_available = mx31_rx_available;
- } else if (cpu_is_mx27() || cpu_is_mx21()) {
- spi_imx->intctrl = mx27_intctrl;
- spi_imx->config = mx27_config;
- spi_imx->trigger = mx27_trigger;
- spi_imx->rx_available = mx27_rx_available;
- } else if (cpu_is_mx1()) {
- spi_imx->intctrl = mx1_intctrl;
- spi_imx->config = mx1_config;
- spi_imx->trigger = mx1_trigger;
- spi_imx->rx_available = mx1_rx_available;
- } else
- BUG();
-
spi_imx->clk = clk_get(&pdev->dev, NULL);
if (IS_ERR(spi_imx->clk)) {
dev_err(&pdev->dev, "unable to get clock\n");
clk_enable(spi_imx->clk);
spi_imx->spi_clk = clk_get_rate(spi_imx->clk);
- if (cpu_is_mx1() || cpu_is_mx21() || cpu_is_mx27())
- writel(1, spi_imx->base + MXC_RESET);
-
- /* drain receive buffer */
- if (cpu_is_mx25() || cpu_is_mx31() || cpu_is_mx35())
- while (readl(spi_imx->base + MX3_CSPISTAT) & MX3_CSPISTAT_RR)
- readl(spi_imx->base + MXC_CSPIRXDATA);
+ spi_imx->devtype_data.reset(spi_imx);
- spi_imx->intctrl(spi_imx, 0);
+ spi_imx->devtype_data.intctrl(spi_imx, 0);
ret = spi_bitbang_start(&spi_imx->bitbang);
if (ret) {
.name = DRIVER_NAME,
.owner = THIS_MODULE,
},
+ .id_table = spi_imx_devtype,
.probe = spi_imx_probe,
.remove = __devexit_p(spi_imx_remove),
};
projects / firefly-linux-kernel-4.4.55.git / blobdiff