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authorHaavard Skinnemoen <hskinnemoen@atmel.com>2007-02-16 13:56:11 +0100
committerHaavard Skinnemoen <hskinnemoen@atmel.com>2007-02-16 14:01:40 +0100
commit41d8ca452f523b9245704c7dd8ef290fa7b78e6b (patch)
tree41d84a6d1a1f20e7e74893eb76bf9a2c4de5c709 /arch/avr32/mach-at32ap
parent23cebe2287474720c2eb0673581056cfb285a69f (diff)
[AVR32] Use per-controller spi_board_info structures
Set up one spi_board_info array per controller and pass this to at32_add_device_spi so that it can set up any GPIO pins for chip selects based on this information. Extracted from a patch by David Brownell and adapted slightly. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Diffstat (limited to 'arch/avr32/mach-at32ap')
-rw-r--r--arch/avr32/mach-at32ap/at32ap7000.c55
1 files changed, 38 insertions, 17 deletions
diff --git a/arch/avr32/mach-at32ap/at32ap7000.c b/arch/avr32/mach-at32ap/at32ap7000.c
index a5037aa102f..bc235507c5c 100644
--- a/arch/avr32/mach-at32ap/at32ap7000.c
+++ b/arch/avr32/mach-at32ap/at32ap7000.c
@@ -8,6 +8,7 @@
#include <linux/clk.h>
#include <linux/init.h>
#include <linux/platform_device.h>
+#include <linux/spi/spi.h>
#include <asm/io.h>
@@ -751,8 +752,41 @@ static struct resource atmel_spi1_resource[] = {
DEFINE_DEV(atmel_spi, 1);
DEV_CLK(spi_clk, atmel_spi1, pba, 1);
-struct platform_device *__init at32_add_device_spi(unsigned int id)
+static void
+at32_spi_setup_slaves(unsigned int bus_num, struct spi_board_info *b,
+ unsigned int n, const u8 *pins)
{
+ unsigned int pin, mode;
+
+ for (; n; n--, b++) {
+ b->bus_num = bus_num;
+ if (b->chip_select >= 4)
+ continue;
+ pin = (unsigned)b->controller_data;
+ if (!pin) {
+ pin = pins[b->chip_select];
+ b->controller_data = (void *)pin;
+ }
+ mode = AT32_GPIOF_OUTPUT;
+ if (!(b->mode & SPI_CS_HIGH))
+ mode |= AT32_GPIOF_HIGH;
+ at32_select_gpio(pin, mode);
+ }
+}
+
+struct platform_device *__init
+at32_add_device_spi(unsigned int id, struct spi_board_info *b, unsigned int n)
+{
+ /*
+ * Manage the chipselects as GPIOs, normally using the same pins
+ * the SPI controller expects; but boards can use other pins.
+ */
+ static u8 __initdata spi0_pins[] =
+ { GPIO_PIN_PA(3), GPIO_PIN_PA(4),
+ GPIO_PIN_PA(5), GPIO_PIN_PA(20), };
+ static u8 __initdata spi1_pins[] =
+ { GPIO_PIN_PB(2), GPIO_PIN_PB(3),
+ GPIO_PIN_PB(4), GPIO_PIN_PA(27), };
struct platform_device *pdev;
switch (id) {
@@ -761,14 +795,7 @@ struct platform_device *__init at32_add_device_spi(unsigned int id)
select_peripheral(PA(0), PERIPH_A, 0); /* MISO */
select_peripheral(PA(1), PERIPH_A, 0); /* MOSI */
select_peripheral(PA(2), PERIPH_A, 0); /* SCK */
-
- /* NPCS[2:0] */
- at32_select_gpio(GPIO_PIN_PA(3),
- AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
- at32_select_gpio(GPIO_PIN_PA(4),
- AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
- at32_select_gpio(GPIO_PIN_PA(5),
- AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
+ at32_spi_setup_slaves(0, b, n, spi0_pins);
break;
case 1:
@@ -776,20 +803,14 @@ struct platform_device *__init at32_add_device_spi(unsigned int id)
select_peripheral(PB(0), PERIPH_B, 0); /* MISO */
select_peripheral(PB(1), PERIPH_B, 0); /* MOSI */
select_peripheral(PB(5), PERIPH_B, 0); /* SCK */
-
- /* NPCS[2:0] */
- at32_select_gpio(GPIO_PIN_PB(2),
- AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
- at32_select_gpio(GPIO_PIN_PB(3),
- AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
- at32_select_gpio(GPIO_PIN_PB(4),
- AT32_GPIOF_OUTPUT | AT32_GPIOF_HIGH);
+ at32_spi_setup_slaves(1, b, n, spi1_pins);
break;
default:
return NULL;
}
+ spi_register_board_info(b, n);
platform_device_register(pdev);
return pdev;
}