diff options
| author | Hans-Christian Egtvedt <hcegtvedt@atmel.com> | 2008-05-16 11:10:32 +0200 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2008-06-03 20:30:05 +0200 |
| commit | 60445cb5c3eb77ed1a07f2d908eef09174483698 (patch) | |
| tree | bea7feee25572ecae29288549f0344a8f3a3da26 /cpu/at32ap | |
| parent | d255bb0e78d1cac5b7c8c98cb77a095f5f16de0d (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/at32ap')
| -rw-r--r-- | cpu/at32ap/at32ap700x/gpio.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/cpu/at32ap/at32ap700x/gpio.c b/cpu/at32ap/at32ap700x/gpio.c index 859124a91f..3da35d4fe2 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 |