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authorHans-Christian Egtvedt <hcegtvedt@atmel.com>2008-05-16 11:10:32 +0200
committerWolfgang Denk <wd@denx.de>2008-06-03 20:30:05 +0200
commit60445cb5c3eb77ed1a07f2d908eef09174483698 (patch)
treebea7feee25572ecae29288549f0344a8f3a3da26 /cpu
parentd255bb0e78d1cac5b7c8c98cb77a095f5f16de0d (diff)
atmel_spi: Driver for the Atmel SPI controller
This adds a driver for the SPI controller found on most AT91 and AVR32 chips, implementing the new SPI API. Changed in v4: - Update to new API - Handle zero-length transfers appropriately. The user may send a zero-length SPI transfer with SPI_XFER_END set in order to deactivate the chip select after a series of transfers with chip select active. This is useful e.g. when polling the status register of DataFlash. Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Diffstat (limited to 'cpu')
-rw-r--r--cpu/at32ap/at32ap700x/gpio.c43
1 files changed, 43 insertions, 0 deletions
diff --git a/cpu/at32ap/at32ap700x/gpio.c b/cpu/at32ap/at32ap700x/gpio.c
index 859124a91f6..3da35d4fe23 100644
--- a/cpu/at32ap/at32ap700x/gpio.c
+++ b/cpu/at32ap/at32ap700x/gpio.c
@@ -21,8 +21,11 @@
*/
#include <common.h>
+#include <asm/io.h>
+
#include <asm/arch/chip-features.h>
#include <asm/arch/gpio.h>
+#include <asm/arch/memory-map.h>
/*
* Lots of small functions here. We depend on --gc-sections getting
@@ -142,3 +145,43 @@ void gpio_enable_mmci(void)
gpio_select_periph_A(GPIO_PIN_PA15, 0); /* DATA3 */
}
#endif
+
+#ifdef AT32AP700x_CHIP_HAS_SPI
+void gpio_enable_spi0(unsigned long cs_mask)
+{
+ u32 pa_mask = 0;
+
+ gpio_select_periph_A(GPIO_PIN_PA0, 0); /* MISO */
+ gpio_select_periph_A(GPIO_PIN_PA1, 0); /* MOSI */
+ gpio_select_periph_A(GPIO_PIN_PA2, 0); /* SCK */
+
+ if (cs_mask & (1 << 0))
+ pa_mask |= 1 << 3; /* NPCS0 */
+ if (cs_mask & (1 << 1))
+ pa_mask |= 1 << 4; /* NPCS1 */
+ if (cs_mask & (1 << 2))
+ pa_mask |= 1 << 5; /* NPCS2 */
+ if (cs_mask & (1 << 3))
+ pa_mask |= 1 << 20; /* NPCS3 */
+
+ __raw_writel(pa_mask, PIOA_BASE + 0x00);
+ __raw_writel(pa_mask, PIOA_BASE + 0x30);
+ __raw_writel(pa_mask, PIOA_BASE + 0x10);
+}
+
+void gpio_enable_spi1(unsigned long cs_mask)
+{
+ gpio_select_periph_B(GPIO_PIN_PA0, 0); /* MISO */
+ gpio_select_periph_B(GPIO_PIN_PB1, 0); /* MOSI */
+ gpio_select_periph_B(GPIO_PIN_PB5, 0); /* SCK */
+
+ if (cs_mask & (1 << 0))
+ gpio_select_periph_B(GPIO_PIN_PB2, 0); /* NPCS0 */
+ if (cs_mask & (1 << 1))
+ gpio_select_periph_B(GPIO_PIN_PB3, 0); /* NPCS1 */
+ if (cs_mask & (1 << 2))
+ gpio_select_periph_B(GPIO_PIN_PB4, 0); /* NPCS2 */
+ if (cs_mask & (1 << 3))
+ gpio_select_periph_A(GPIO_PIN_PA27, 0); /* NPCS3 */
+}
+#endif