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https://github.com/AsahiLinux/u-boot
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60 lines
1.9 KiB
C
60 lines
1.9 KiB
C
/*
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* Copyright (C) 2010
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* Reinhard Meyer, EMK Elektronik, reinhard.meyer@emk-elektronik.de
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <asm/arch/hardware.h>
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#include <asm/arch/at91_spi.h>
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#include <asm/arch/gpio.h>
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#include <spi.h>
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static const struct {
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u32 port;
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u32 bit;
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} cs_to_portbit[2][4] = {
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{{AT91_PIO_PORTA, 3}, {AT91_PIO_PORTC, 11},
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{AT91_PIO_PORTC, 16}, {AT91_PIO_PORTC, 17} },
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{{AT91_PIO_PORTB, 3}, {AT91_PIO_PORTC, 5},
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{AT91_PIO_PORTC, 4}, {AT91_PIO_PORTC, 3} }
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};
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int spi_cs_is_valid(unsigned int bus, unsigned int cs)
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{
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debug("spi_cs_is_valid: bus=%u cs=%u\n", bus, cs);
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if (bus < 2 && cs < 4)
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return 1;
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return 0;
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}
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void spi_cs_activate(struct spi_slave *slave)
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{
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debug("spi_cs_activate: bus=%u cs=%u\n", slave->bus, slave->cs);
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at91_set_pio_output(cs_to_portbit[slave->bus][slave->cs].port,
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cs_to_portbit[slave->bus][slave->cs].bit, 0);
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}
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void spi_cs_deactivate(struct spi_slave *slave)
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{
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debug("spi_cs_deactivate: bus=%u cs=%u\n", slave->bus, slave->cs);
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at91_set_pio_output(cs_to_portbit[slave->bus][slave->cs].port,
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cs_to_portbit[slave->bus][slave->cs].bit, 1);
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}
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