From: Subhasish <subhas...@mistralsolutions.com>
The patch adds support for an emulated CAN controller
on the programmable realtime unit (PRU) available on OMAPL138.
This defines the system resource requirements such as pin mux,
clock, iomem, interrupt etc and registers the platform device
as per the Linux driver model.
Signed-off-by: Subhasish <subhas...@mistralsolutions.com>
---
arch/arm/mach-davinci/Makefile | 2 +-
arch/arm/mach-davinci/da850.c | 12 +++++++++++
arch/arm/mach-davinci/devices-da8xx.c | 29 ++++++++++++++++++++++++++++
arch/arm/mach-davinci/include/mach/da8xx.h | 2 +
arch/arm/mach-davinci/include/mach/mux.h | 5 ++++
5 files changed, 49 insertions(+), 1 deletions(-)
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,
--
1.7.2.3
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