[ARM] pxa/zeus: Add support for mcp2515 CAN bus

Signed-off-by: Marc Zyngier <maz@misterjones.org>
Signed-off-by: Eric Miao <eric.y.miao@gmail.com>

2 files changed, 51 insertions, 6 deletions

diff --git a/arch/arm/mach-pxa/include/mach/zeus.h b/arch/arm/mach-pxa/include/mach/zeus.h
index 89e4fb58e5f..6e119976003 100644
--- a/arch/arm/mach-pxa/include/mach/zeus.h
+++ b/arch/arm/mach-pxa/include/mach/zeus.h
@@ -58,6 +58,8 @@
 #define ZEUS_EXT1_GPIO(x)       (ZEUS_EXT1_GPIO_BASE + (x))
 #define ZEUS_USER_GPIO(x)       (ZEUS_USER_GPIO_BASE + (x))
 
+#define ZEUS_CAN_SHDN_GPIO      ZEUS_EXT1_GPIO(2)
+
 /*
  * CPLD registers:
  * Only 4 registers, but spreaded over a 32MB address space.
diff --git a/arch/arm/mach-pxa/zeus.c b/arch/arm/mach-pxa/zeus.c
index 9ba8fccd98f..39896d88358 100644
--- a/arch/arm/mach-pxa/zeus.c
+++ b/arch/arm/mach-pxa/zeus.c
@@ -26,6 +26,7 @@
 #include <linux/i2c.h>
 #include <linux/i2c/pca953x.h>
 #include <linux/apm-emulation.h>
+#include <linux/can/platform/mcp251x.h>
 
 #include <asm/mach-types.h>
 #include <asm/mach/arch.h>
@@ -387,11 +388,47 @@ static struct pxa2xx_spi_master pxa2xx_spi_ssp3_master_info = {
         .enable_dma     = 1,
 };
 
-static struct platform_device pxa2xx_spi_ssp3_device = {
-        .name = "pxa2xx-spi",
-        .id = 3,
-        .dev = {
-                .platform_data = &pxa2xx_spi_ssp3_master_info,
+/* CAN bus on SPI */
+static int zeus_mcp2515_setup(struct spi_device *sdev)
+{
+        int err;
+
+        err = gpio_request(ZEUS_CAN_SHDN_GPIO, "CAN shutdown");
+        if (err)
+                return err;
+
+        err = gpio_direction_output(ZEUS_CAN_SHDN_GPIO, 1);
+        if (err) {
+                gpio_free(ZEUS_CAN_SHDN_GPIO);
+                return err;
+        }
+
+        return 0;
+}
+
+static int zeus_mcp2515_transceiver_enable(int enable)
+{
+        gpio_set_value(ZEUS_CAN_SHDN_GPIO, !enable);
+        return 0;
+}
+
+static struct mcp251x_platform_data zeus_mcp2515_pdata = {
+        .oscillator_frequency   = 16*1000*1000,
+        .model                  = CAN_MCP251X_MCP2515,
+        .board_specific_setup   = zeus_mcp2515_setup,
+        .transceiver_enable     = zeus_mcp2515_transceiver_enable,
+        .power_enable           = zeus_mcp2515_transceiver_enable,
+};
+
+static struct spi_board_info zeus_spi_board_info[] = {
+        [0] = {
+                .modalias       = "mcp251x",
+                .platform_data  = &zeus_mcp2515_pdata,
+                .irq            = gpio_to_irq(ZEUS_CAN_GPIO),
+                .max_speed_hz   = 1*1000*1000,
+                .bus_num        = 3,
+                .mode           = SPI_MODE_0,
+                .chip_select    = 0,
         },
 };
 
@@ -476,7 +513,6 @@ static struct platform_device *zeus_devices[] __initdata = {
         &zeus_dm9k0_device,
         &zeus_dm9k1_device,
         &zeus_sram_device,
-        &pxa2xx_spi_ssp3_device,
         &zeus_leds_device,
         &zeus_pcmcia_device,
         &zeus_max6369_device,
@@ -757,6 +793,11 @@ static mfp_cfg_t zeus_pin_config[] __initdata = {
         GPIO104_CIF_DD_2,
         GPIO105_CIF_DD_1,
 
+        GPIO81_SSP3_TXD,
+        GPIO82_SSP3_RXD,
+        GPIO83_SSP3_SFRM,
+        GPIO84_SSP3_SCLK,
+
         GPIO48_nPOE,
         GPIO49_nPWE,
         GPIO50_nPIOR,
@@ -811,6 +852,8 @@ static void __init zeus_init(void)
         pxa_set_ac97_info(&zeus_ac97_info);
         pxa_set_i2c_info(NULL);
         i2c_register_board_info(0, ARRAY_AND_SIZE(zeus_i2c_devices));
+        pxa2xx_set_spi_info(3, &pxa2xx_spi_ssp3_master_info);
+        spi_register_board_info(zeus_spi_board_info, ARRAY_SIZE(zeus_spi_board_info));
 }
 
 static struct map_desc zeus_io_desc[] __initdata = {