diff options
| author | Reinhard Meyer <u-boot@emk-elektronik.de> | 2010-08-25 12:32:53 +0200 |
|---|---|---|
| committer | Reinhard Meyer <u-boot@emk-elektronik.de> | 2010-09-03 11:22:49 +0200 |
| commit | 7588ad12bafe596c273e13cd80bb3bfbac0e08c7 (patch) | |
| tree | ff13d5a95bcc1368d4b20a7b242f01d6d85bef94 /arch/arm/cpu/arm926ejs/at91 | |
| parent | f09d3b289689d452b456f77d745188a9e6e2e2ee (diff) | |
AT91: add option to enable pullups in at91sam9260_devices.c
Signed-off-by: Reinhard Meyer <u-boot@emk-elektronik.de>
Diffstat (limited to 'arch/arm/cpu/arm926ejs/at91')
| -rw-r--r-- | arch/arm/cpu/arm926ejs/at91/at91sam9260_devices.c | 35 |
1 files changed, 25 insertions, 10 deletions
diff --git a/arch/arm/cpu/arm926ejs/at91/at91sam9260_devices.c b/arch/arm/cpu/arm926ejs/at91/at91sam9260_devices.c index 2d8848152..87b04426b 100644 --- a/arch/arm/cpu/arm926ejs/at91/at91sam9260_devices.c +++ b/arch/arm/cpu/arm926ejs/at91/at91sam9260_devices.c @@ -28,12 +28,27 @@ #include <asm/arch/gpio.h> #include <asm/arch/io.h> +/* + * if CONFIG_AT91_GPIO_PULLUP ist set, keep pullups on on all + * peripheral pins. Good to have if hardware is soldered optionally + * or in case of SPI no slave is selected. Avoid lines to float + * needlessly. Use a short local PUP define. + * + * Due to errata "TXD floats when CTS is inactive" pullups are always + * on for TXD pins. + */ +#ifdef CONFIG_AT91_GPIO_PULLUP +# define PUP CONFIG_AT91_GPIO_PULLUP +#else +# define PUP 0 +#endif + void at91_serial0_hw_init(void) { at91_pmc_t *pmc = (at91_pmc_t *) AT91_PMC_BASE; at91_set_a_periph(AT91_PIO_PORTB, 4, 1); /* TXD0 */ - at91_set_a_periph(AT91_PIO_PORTB, 5, 0); /* RXD0 */ + at91_set_a_periph(AT91_PIO_PORTB, 5, PUP); /* RXD0 */ writel(1 << AT91SAM9260_ID_US0, &pmc->pcer); } @@ -42,7 +57,7 @@ void at91_serial1_hw_init(void) at91_pmc_t *pmc = (at91_pmc_t *) AT91_PMC_BASE; at91_set_a_periph(AT91_PIO_PORTB, 6, 1); /* TXD1 */ - at91_set_a_periph(AT91_PIO_PORTB, 7, 0); /* RXD1 */ + at91_set_a_periph(AT91_PIO_PORTB, 7, PUP); /* RXD1 */ writel(1 << AT91SAM9260_ID_US1, &pmc->pcer); } @@ -51,7 +66,7 @@ void at91_serial2_hw_init(void) at91_pmc_t *pmc = (at91_pmc_t *) AT91_PMC_BASE; at91_set_a_periph(AT91_PIO_PORTB, 8, 1); /* TXD2 */ - at91_set_a_periph(AT91_PIO_PORTB, 9, 0); /* RXD2 */ + at91_set_a_periph(AT91_PIO_PORTB, 9, PUP); /* RXD2 */ writel(1 << AT91SAM9260_ID_US2, &pmc->pcer); } @@ -59,7 +74,7 @@ void at91_serial3_hw_init(void) { at91_pmc_t *pmc = (at91_pmc_t *) AT91_PMC_BASE; - at91_set_a_periph(AT91_PIO_PORTB, 14, 0); /* DRXD */ + at91_set_a_periph(AT91_PIO_PORTB, 14, PUP); /* DRXD */ at91_set_a_periph(AT91_PIO_PORTB, 15, 1); /* DTXD */ writel(1 << AT91_ID_SYS, &pmc->pcer); } @@ -88,9 +103,9 @@ void at91_spi0_hw_init(unsigned long cs_mask) { at91_pmc_t *pmc = (at91_pmc_t *) AT91_PMC_BASE; - at91_set_a_periph(AT91_PIO_PORTA, 0, 0); /* SPI0_MISO */ - at91_set_a_periph(AT91_PIO_PORTA, 1, 0); /* SPI0_MOSI */ - at91_set_a_periph(AT91_PIO_PORTA, 2, 0); /* SPI0_SPCK */ + at91_set_a_periph(AT91_PIO_PORTA, 0, PUP); /* SPI0_MISO */ + at91_set_a_periph(AT91_PIO_PORTA, 1, PUP); /* SPI0_MOSI */ + at91_set_a_periph(AT91_PIO_PORTA, 2, PUP); /* SPI0_SPCK */ /* Enable clock */ writel(1 << AT91SAM9260_ID_SPI0, &pmc->pcer); @@ -125,9 +140,9 @@ void at91_spi1_hw_init(unsigned long cs_mask) { at91_pmc_t *pmc = (at91_pmc_t *) AT91_PMC_BASE; - at91_set_a_periph(AT91_PIO_PORTB, 0, 0); /* SPI1_MISO */ - at91_set_a_periph(AT91_PIO_PORTB, 1, 0); /* SPI1_MOSI */ - at91_set_a_periph(AT91_PIO_PORTB, 2, 0); /* SPI1_SPCK */ + at91_set_a_periph(AT91_PIO_PORTB, 0, PUP); /* SPI1_MISO */ + at91_set_a_periph(AT91_PIO_PORTB, 1, PUP); /* SPI1_MOSI */ + at91_set_a_periph(AT91_PIO_PORTB, 2, PUP); /* SPI1_SPCK */ /* Enable clock */ writel(1 << AT91SAM9260_ID_SPI1, &pmc->pcer); |