[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>

diff --git a/arch/arm/mach-pxa/include/mach/zeus.h b/arch/arm/mach-pxa/include/mach/zeus.h
index 89e4fb5..6e11997 100644 (file)
--- 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 9ba8fcc..39896d8 100644 (file)
--- 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 = {