u-boot/board/emk/top9000/spi.c
Wolfgang Denk 1a4596601f Add GPL-2.0+ SPDX-License-Identifier to source files
Signed-off-by: Wolfgang Denk <wd@denx.de>
[trini: Fixup common/cmd_io.c]
Signed-off-by: Tom Rini <trini@ti.com>
2013-07-24 09:44:38 -04:00

44 lines
1.1 KiB
C

/*
* Copyright (C) 2010
* Reinhard Meyer, EMK Elektronik, reinhard.meyer@emk-elektronik.de
*
* SPDX-License-Identifier: GPL-2.0+
*/
#include <common.h>
#include <asm/arch/hardware.h>
#include <asm/arch/at91_spi.h>
#include <asm/arch/gpio.h>
#include <spi.h>
static const struct {
u32 port;
u32 bit;
} cs_to_portbit[2][4] = {
{{AT91_PIO_PORTA, 3}, {AT91_PIO_PORTC, 11},
{AT91_PIO_PORTC, 16}, {AT91_PIO_PORTC, 17} },
{{AT91_PIO_PORTB, 3}, {AT91_PIO_PORTC, 5},
{AT91_PIO_PORTC, 4}, {AT91_PIO_PORTC, 3} }
};
int spi_cs_is_valid(unsigned int bus, unsigned int cs)
{
debug("spi_cs_is_valid: bus=%u cs=%u\n", bus, cs);
if (bus < 2 && cs < 4)
return 1;
return 0;
}
void spi_cs_activate(struct spi_slave *slave)
{
debug("spi_cs_activate: bus=%u cs=%u\n", slave->bus, slave->cs);
at91_set_pio_output(cs_to_portbit[slave->bus][slave->cs].port,
cs_to_portbit[slave->bus][slave->cs].bit, 0);
}
void spi_cs_deactivate(struct spi_slave *slave)
{
debug("spi_cs_deactivate: bus=%u cs=%u\n", slave->bus, slave->cs);
at91_set_pio_output(cs_to_portbit[slave->bus][slave->cs].port,
cs_to_portbit[slave->bus][slave->cs].bit, 1);
}