[PATCH 5/6] spi-imx: Add i.MX51 support

[Uwe Kleine-König]

From: Sascha Hauer <s.hauer at pengutronix.de>

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 drivers/spi/spi_imx.c |  123 +++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 120 insertions(+), 3 deletions(-)

diff --git a/drivers/spi/spi_imx.c b/drivers/spi/spi_imx.c
index 7972e90..5ee2699 100644
--- a/drivers/spi/spi_imx.c
+++ b/drivers/spi/spi_imx.c
@@ -155,6 +155,117 @@ static unsigned int spi_imx_clkdiv_2(unsigned int fin,
 	return 7;
 }
 
+/* MX51 */
+static unsigned int spi_imx_clkdiv_3(unsigned int fin,
+		unsigned int fspi)
+{
+	unsigned int div = 4, post = 0, pre = 0, res;
+
+	div = fin / fspi;
+
+	res = fin;
+	while (res > (fspi * 16)) {
+		post++;
+		res = fin / (1 << post);
+	}
+
+	pre = fin / (1 << post) / fspi;
+
+	return (post & 0xf) | ((pre & 0xf) << 4);
+}
+
+#define MX51_CSPIRXDATA		0x00
+#define MX51_CSPITXDATA		0x04
+#define MX51_CSPICTRL		0x08
+#define MX51_CSPICONFIG		0x0c
+#define MX51_CSPIINT		0x10
+#define MX51_CSPIDMA		0x14
+#define MX51_CSPISTATUS		0x18
+#define MX51_CSPIPERIOD		0x1c
+#define MX51_CSPITEST		0x20
+
+#define MX51_INTREG_TEEN	(1 << 0)
+#define MX51_INTREG_RREN	(1 << 3)
+
+#define MX51_CSPICTRL_ENABLE	(1 << 0)
+#define MX51_CSPICTRL_XCH	(1 << 2)
+#define MX51_CSPICTRL_DIV_SHIFT	8
+#define MX51_CSPICTRL_MASTER(cs)	((1 << (cs)) << 4)
+#define MX51_CSPICTRL_BL_SHIFT	20
+#define MX51_CSPICTRL_CS(cs)	((cs) << 18)
+
+#define MX51_CSPICONFIG_PHA(cs)		((1 << (cs)) << 0)
+#define MX51_CSPICONFIG_POL(cs)		((1 << (cs)) << 4)
+#define MX51_CSPICONFIG_SSBCTRL(cs)	((1 << (cs)) << 8)
+#define MX51_CSPICONFIG_SSBPOL(cs)	((1 << (cs)) << 12)
+#define MX51_CSPICONFIG_DATACTRL(cs)	((1 << (cs)) << 16)
+#define MX51_CSPICONFIG_SCLKCTRL(cs)	((1 << (cs)) << 20)
+
+#define MX51_STATUS_RR		(1 << 3)
+
+#define MX51_CSPITEST_LBC	(1 << 31)
+
+static void mx51_intctrl(struct spi_imx_data *spi_imx, int enable)
+{
+	unsigned int val = 0;
+
+	if (enable & MXC_INT_TE)
+		val |= MX51_INTREG_TEEN;
+	if (enable & MXC_INT_RR)
+		val |= MX51_INTREG_RREN;
+
+	writel(val, spi_imx->base + MX51_CSPIINT);
+}
+
+static void mx51_trigger(struct spi_imx_data *spi_imx)
+{
+	unsigned int reg;
+
+	reg = readl(spi_imx->base + MXC_CSPICTRL);
+	reg |= MX51_CSPICTRL_XCH;
+	writel(reg, spi_imx->base + MXC_CSPICTRL);
+}
+
+static int mx51_config(struct spi_imx_data *spi_imx,
+		struct spi_imx_config *config)
+{
+	int cs;
+	u32 ctrl;
+	u32 cfg = 0;
+
+#ifdef INTERNAL_LOOPBACK
+	writel(MX51_CSPITEST_LBC, spi_imx->base + MX51_CSPITEST);
+#endif
+	if (config->cs < 0)
+		cs = config->cs + 32;
+	else
+		cs = 0;
+
+	ctrl = MX51_CSPICTRL_MASTER(cs) | MX51_CSPICTRL_ENABLE;
+	ctrl |= spi_imx_clkdiv_3(spi_imx->spi_clk, config->speed_hz) <<
+		MX51_CSPICTRL_DIV_SHIFT;
+
+	ctrl |= (config->bpw - 1) << MX51_CSPICTRL_BL_SHIFT;
+	cfg |= MX51_CSPICONFIG_SSBCTRL(cs);
+	if (config->mode & SPI_CPHA)
+		cfg |= MX51_CSPICONFIG_PHA(cs);
+	if (config->mode & SPI_CPOL)
+		cfg |= MX51_CSPICONFIG_POL(cs) | MX51_CSPICONFIG_SCLKCTRL(cs);
+	if (config->mode & SPI_CS_HIGH)
+		cfg |= MX51_CSPICONFIG_SSBPOL(cs);
+	ctrl |= MX51_CSPICTRL_CS(cs);
+
+	writel(ctrl, spi_imx->base + MX51_CSPICTRL);
+	writel(cfg, spi_imx->base + MX51_CSPICONFIG);
+
+	return 0;
+}
+
+static int mx51_rx_available(struct spi_imx_data *spi_imx)
+{
+	return readl(spi_imx->base + MX51_CSPISTATUS) & MX51_STATUS_RR;
+}
+
 #define MX31_INTREG_TEEN	(1 << 0)
 #define MX31_INTREG_RREN	(1 << 3)
 
@@ -209,7 +320,7 @@ static int mx31_config(struct spi_imx_data *spi_imx,
 
 	if (cpu_is_mx31())
 		reg |= (config->bpw - 1) << MX31_CSPICTRL_BC_SHIFT;
-	else if (cpu_is_mx25() || cpu_is_mx35()) {
+	else if (cpu_is_mx25() || cpu_is_mx35() || cpu_is_mx51()) {
 		reg |= (config->bpw - 1) << MX35_CSPICTRL_BL_SHIFT;
 		reg |= MX31_CSPICTRL_SSCTL;
 	}
@@ -223,7 +334,7 @@ static int mx31_config(struct spi_imx_data *spi_imx,
 	if (config->cs < 0) {
 		if (cpu_is_mx31())
 			reg |= (config->cs + 32) << MX31_CSPICTRL_CS_SHIFT;
-		else if (cpu_is_mx25() || cpu_is_mx35())
+		else if (cpu_is_mx25() || cpu_is_mx35() || cpu_is_mx51())
 			reg |= (config->cs + 32) << MX35_CSPICTRL_CS_SHIFT;
 	}
 
@@ -567,7 +678,8 @@ static int __devinit spi_imx_probe(struct platform_device *pdev)
 		goto out_iounmap;
 	}
 
-	if (cpu_is_mx25() || cpu_is_mx31() || cpu_is_mx35()) {
+	if (cpu_is_mx25() || cpu_is_mx31() || cpu_is_mx35() ||
+			(cpu_is_mx51() && pdev->id == 2)) {
 		spi_imx->intctrl = mx31_intctrl;
 		spi_imx->config = mx31_config;
 		spi_imx->trigger = mx31_trigger;
@@ -582,6 +694,11 @@ static int __devinit spi_imx_probe(struct platform_device *pdev)
 		spi_imx->config = mx1_config;
 		spi_imx->trigger = mx1_trigger;
 		spi_imx->rx_available = mx1_rx_available;
+	} else if (cpu_is_mx51()) {
+		spi_imx->intctrl = mx51_intctrl;
+		spi_imx->config = mx51_config;
+		spi_imx->trigger = mx51_trigger;
+		spi_imx->rx_available = mx51_rx_available;
 	} else
 		BUG();
 
-- 
1.7.1