[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/zeus.c b/arch/arm/mach-pxa/zeus.c
index 9ba8fcc..39896d8 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 @@
.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 @@
&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 @@
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 @@
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 = {