[RFC:,1/5] da850: Support for TI's PRU CAN Emulation.

Commit Message

Subhasish Ghosh Jan. 3, 2011, 2:04 p.m. UTC

None

Patch

diff --git a/arch/arm/mach-davinci/Makefile b/arch/arm/mach-davinci/Makefile
index 0b87a1c..ab6ce33 100644
--- a/arch/arm/mach-davinci/Makefile
+++ b/arch/arm/mach-davinci/Makefile
@@ -5,7 +5,7 @@ 
 
 # Common objects
 obj-y 			:= time.o clock.o serial.o io.o psc.o \
-			   gpio.o dma.o usb.o common.o sram.o aemif.o
+			   gpio.o dma.o usb.o common.o sram.o aemif.o pru.o
 
 obj-$(CONFIG_DAVINCI_MUX)		+= mux.o
 
diff --git a/arch/arm/mach-davinci/da850.c b/arch/arm/mach-davinci/da850.c
index 78b5ae2..7c883e2 100644
--- a/arch/arm/mach-davinci/da850.c
+++ b/arch/arm/mach-davinci/da850.c
@@ -238,6 +238,12 @@  static struct clk tptc2_clk = {
 	.flags		= ALWAYS_ENABLED,
 };
 
+static struct clk pru_clk = {
+	.name       = "pru_ck",
+	.parent     = &pll0_sysclk2,
+	.lpsc       = DA8XX_LPSC0_DMAX,
+};
+
 static struct clk uart0_clk = {
 	.name		= "uart0",
 	.parent		= &pll0_sysclk2,
@@ -373,6 +379,7 @@  static struct clk_lookup da850_clks[] = {
 	CLK(NULL,		"tpcc1",	&tpcc1_clk),
 	CLK(NULL,		"tptc2",	&tptc2_clk),
 	CLK(NULL,		"uart0",	&uart0_clk),
+	CLK(NULL,		"pru_ck",	&pru_clk),
 	CLK(NULL,		"uart1",	&uart1_clk),
 	CLK(NULL,		"uart2",	&uart2_clk),
 	CLK(NULL,		"aintc",	&aintc_clk),
@@ -542,7 +549,12 @@  static const struct mux_config da850_pins[] = {
 	MUX_CFG(DA850, EMA_CLK,		6,	0,	15,	1,	false)
 	MUX_CFG(DA850, EMA_WAIT_1,	6,	24,	15,	1,	false)
 	MUX_CFG(DA850, NEMA_CS_2,	7,	0,	15,	1,	false)
+	/* PRU functions for soft CAN */
+	MUX_CFG(DA850, PRU0_R31_0,	7,	28,	15, 0,	false)
+	MUX_CFG(DA850, PRU1_R30_15,	12,	0,	15, 4,	false)
+	MUX_CFG(DA850, PRU1_R31_18,	11,	20,	15, 0,	false)
 	/* GPIO function */
+	MUX_CFG(DA850, GPIO2_0,		6,	28,	15,	8,	false)
 	MUX_CFG(DA850, GPIO2_6,		6,	4,	15,	8,	false)
 	MUX_CFG(DA850, GPIO2_8,		5,	28,	15,	8,	false)
 	MUX_CFG(DA850, GPIO2_15,	5,	0,	15,	8,	false)
diff --git a/arch/arm/mach-davinci/devices-da8xx.c b/arch/arm/mach-davinci/devices-da8xx.c
index 9eec630..9d1b110 100644
--- a/arch/arm/mach-davinci/devices-da8xx.c
+++ b/arch/arm/mach-davinci/devices-da8xx.c
@@ -85,6 +85,35 @@  struct platform_device da8xx_serial_device = {
 	},
 };
 
+/* Info specific to OMAPL138 */
+#define OMAPL138_PRU_MEM_BASE     0x01C30000
+#define OMAPL138_INT_PRU_CAN IRQ_DA8XX_EVTOUT0
+static struct resource omapl138_pru_can_resources[] = {
+	{
+		.start  = OMAPL138_PRU_MEM_BASE,
+		.end    = OMAPL138_PRU_MEM_BASE + 0xFFFF,
+		.flags  = IORESOURCE_MEM,
+	},
+	{
+		.start  = OMAPL138_INT_PRU_CAN,
+		.end    = OMAPL138_INT_PRU_CAN,
+		.flags  = IORESOURCE_IRQ,
+	},
+};
+
+/* Info specific to CAN conroller */
+static struct platform_device omapl138_pru_can_device = {
+	.name			= "davinci_pru_can",
+	.id				= -1,
+	.num_resources  = ARRAY_SIZE(omapl138_pru_can_resources),
+	.resource       = omapl138_pru_can_resources,
+};
+
+int __init da8xx_register_pru_can(void)
+{
+	return platform_device_register(&omapl138_pru_can_device);
+}
+
 static const s8 da8xx_queue_tc_mapping[][2] = {
 	/* {event queue no, TC no} */
 	{0, 0},
diff --git a/arch/arm/mach-davinci/include/mach/da8xx.h b/arch/arm/mach-davinci/include/mach/da8xx.h
index e7f9520..9ac65b9 100644
--- a/arch/arm/mach-davinci/include/mach/da8xx.h
+++ b/arch/arm/mach-davinci/include/mach/da8xx.h
@@ -81,6 +81,7 @@  int da8xx_register_watchdog(void);
 int da8xx_register_usb20(unsigned mA, unsigned potpgt);
 int da8xx_register_usb11(struct da8xx_ohci_root_hub *pdata);
 int da8xx_register_emac(void);
+int da8xx_register_pru_can(void);
 int da8xx_register_lcdc(struct da8xx_lcdc_platform_data *pdata);
 int da8xx_register_mmcsd0(struct davinci_mmc_config *config);
 int da850_register_mmcsd1(struct davinci_mmc_config *config);
@@ -129,6 +130,7 @@  extern const short da850_uart2_pins[];
 extern const short da850_i2c0_pins[];
 extern const short da850_i2c1_pins[];
 extern const short da850_cpgmac_pins[];
+extern const short da850_pru_can_pins[];
 extern const short da850_mcasp_pins[];
 extern const short da850_lcdcntl_pins[];
 extern const short da850_mmcsd0_pins[];
diff --git a/arch/arm/mach-davinci/include/mach/mux.h b/arch/arm/mach-davinci/include/mach/mux.h
index de11aac..7c07863 100644
--- a/arch/arm/mach-davinci/include/mach/mux.h
+++ b/arch/arm/mach-davinci/include/mach/mux.h
@@ -906,8 +906,13 @@  enum davinci_da850_index {
 	DA850_EMA_CLK,
 	DA850_EMA_WAIT_1,
 	DA850_NEMA_CS_2,
+	/* PRU I/O */
+	DA850_PRU0_R31_0,
+	DA850_PRU1_R30_15,
+	DA850_PRU1_R31_18,
 
 	/* GPIO function */
+	DA850_GPIO2_0,
 	DA850_GPIO2_6,
 	DA850_GPIO2_8,
 	DA850_GPIO2_15,