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authorPeter Ma <pma@mediamatech.com>2009-08-27 00:31:47 -0700
committerHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2009-08-27 10:20:58 +0200
commit0708420370db7350b75cbf64b1eb80ad1b2a89df (patch)
tree7dcfc21d595bba183468199fb9565a8afbc3c13d /arch/avr32
parent3fe6ad6c39834350d74145de855fbffdde02ace4 (diff)
downloadlinux-0708420370db7350b75cbf64b1eb80ad1b2a89df.tar.bz2
avr32: function for independently setting up SPI slaves
at32ap_spi_setup_slaves() is exposed to allow the addition of SPI slaves to a SPI bus that has already been registered. This is especially useful for add-on cards, which have their own board setup function. at32ap_spi_add_device() has been slightly re-organized, but should be transparent to existing users. So to add a SPI slave, after a SPI bus has already been registered: /* Configure the list of slaves on SPI controller "id" */ at32_spi_setup_slaves(id,spi_board_info,ARRAY_SIZE(spi_board_info)); /* Register the list of slaves */ spi_register_board_info(spi_board_info,ARRAY_SIZE(spi_board_info)); Signed-off-by: Peter Ma <pma@mediamatech.com> [haavard.skinnemoen@atmel.com: trivial whitespace fix] Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Diffstat (limited to 'arch/avr32')
-rw-r--r--arch/avr32/mach-at32ap/at32ap700x.c35
-rw-r--r--arch/avr32/mach-at32ap/include/mach/board.h1
2 files changed, 20 insertions, 16 deletions
diff --git a/arch/avr32/mach-at32ap/at32ap700x.c b/arch/avr32/mach-at32ap/at32ap700x.c
index eb9d4dc2e86d..a47592e2fc32 100644
--- a/arch/avr32/mach-at32ap/at32ap700x.c
+++ b/arch/avr32/mach-at32ap/at32ap700x.c
@@ -1181,19 +1181,32 @@ static struct resource atmel_spi1_resource[] = {
DEFINE_DEV(atmel_spi, 1);
DEV_CLK(spi_clk, atmel_spi1, pba, 1);
-static void __init
-at32_spi_setup_slaves(unsigned int bus_num, struct spi_board_info *b,
- unsigned int n, const u8 *pins)
+void __init
+at32_spi_setup_slaves(unsigned int bus_num, 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 spi_pins[][4] = {
+ { GPIO_PIN_PA(3), GPIO_PIN_PA(4),
+ GPIO_PIN_PA(5), GPIO_PIN_PA(20) },
+ { GPIO_PIN_PB(2), GPIO_PIN_PB(3),
+ GPIO_PIN_PB(4), GPIO_PIN_PA(27) },
+ };
unsigned int pin, mode;
+ /* There are only 2 SPI controllers */
+ if (bus_num > 1)
+ return;
+
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];
+ pin = spi_pins[bus_num][b->chip_select];
b->controller_data = (void *)pin;
}
mode = AT32_GPIOF_OUTPUT;
@@ -1206,16 +1219,6 @@ at32_spi_setup_slaves(unsigned int bus_num, struct spi_board_info *b,
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;
u32 pin_mask;
@@ -1228,7 +1231,7 @@ at32_add_device_spi(unsigned int id, struct spi_board_info *b, unsigned int n)
select_peripheral(PIOA, (1 << 0), PERIPH_A, AT32_GPIOF_PULLUP);
select_peripheral(PIOA, pin_mask, PERIPH_A, 0);
- at32_spi_setup_slaves(0, b, n, spi0_pins);
+ at32_spi_setup_slaves(0, b, n);
break;
case 1:
@@ -1239,7 +1242,7 @@ at32_add_device_spi(unsigned int id, struct spi_board_info *b, unsigned int n)
select_peripheral(PIOB, (1 << 0), PERIPH_B, AT32_GPIOF_PULLUP);
select_peripheral(PIOB, pin_mask, PERIPH_B, 0);
- at32_spi_setup_slaves(1, b, n, spi1_pins);
+ at32_spi_setup_slaves(1, b, n);
break;
default:
diff --git a/arch/avr32/mach-at32ap/include/mach/board.h b/arch/avr32/mach-at32ap/include/mach/board.h
index ddedb471f33e..c7f25bb1d068 100644
--- a/arch/avr32/mach-at32ap/include/mach/board.h
+++ b/arch/avr32/mach-at32ap/include/mach/board.h
@@ -49,6 +49,7 @@ at32_add_device_eth(unsigned int id, struct eth_platform_data *data);
struct spi_board_info;
struct platform_device *
at32_add_device_spi(unsigned int id, struct spi_board_info *b, unsigned int n);
+void at32_spi_setup_slaves(unsigned int bus_num, struct spi_board_info *b, unsigned int n);
struct atmel_lcdfb_info;
struct platform_device *