Reinhard Meyer | 82a0979 | 2010-10-30 23:09:58 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2010 |
| 3 | * Reinhard Meyer, EMK Elektronik, reinhard.meyer@emk-elektronik.de |
| 4 | * |
Wolfgang Denk | d79de1d | 2013-07-08 09:37:19 +0200 | [diff] [blame] | 5 | * SPDX-License-Identifier: GPL-2.0+ |
Reinhard Meyer | 82a0979 | 2010-10-30 23:09:58 +0000 | [diff] [blame] | 6 | */ |
| 7 | |
| 8 | #include <common.h> |
| 9 | #include <asm/arch/hardware.h> |
| 10 | #include <asm/arch/at91_spi.h> |
| 11 | #include <asm/arch/gpio.h> |
| 12 | #include <spi.h> |
| 13 | |
| 14 | static const struct { |
| 15 | u32 port; |
| 16 | u32 bit; |
| 17 | } cs_to_portbit[2][4] = { |
| 18 | {{AT91_PIO_PORTA, 3}, {AT91_PIO_PORTC, 11}, |
| 19 | {AT91_PIO_PORTC, 16}, {AT91_PIO_PORTC, 17} }, |
| 20 | {{AT91_PIO_PORTB, 3}, {AT91_PIO_PORTC, 5}, |
| 21 | {AT91_PIO_PORTC, 4}, {AT91_PIO_PORTC, 3} } |
| 22 | }; |
| 23 | |
| 24 | int spi_cs_is_valid(unsigned int bus, unsigned int cs) |
| 25 | { |
| 26 | debug("spi_cs_is_valid: bus=%u cs=%u\n", bus, cs); |
| 27 | if (bus < 2 && cs < 4) |
| 28 | return 1; |
| 29 | return 0; |
| 30 | } |
| 31 | |
| 32 | void spi_cs_activate(struct spi_slave *slave) |
| 33 | { |
| 34 | debug("spi_cs_activate: bus=%u cs=%u\n", slave->bus, slave->cs); |
| 35 | at91_set_pio_output(cs_to_portbit[slave->bus][slave->cs].port, |
| 36 | cs_to_portbit[slave->bus][slave->cs].bit, 0); |
| 37 | } |
| 38 | |
| 39 | void spi_cs_deactivate(struct spi_slave *slave) |
| 40 | { |
| 41 | debug("spi_cs_deactivate: bus=%u cs=%u\n", slave->bus, slave->cs); |
| 42 | at91_set_pio_output(cs_to_portbit[slave->bus][slave->cs].port, |
| 43 | cs_to_portbit[slave->bus][slave->cs].bit, 1); |
| 44 | } |