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https://github.com/AsahiLinux/u-boot
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83 lines
2 KiB
C
83 lines
2 KiB
C
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/*
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This file defines the interface to the lpc22xx SPI module.
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Copyright (C) 2006 Embedded Artists AB (www.embeddedartists.com)
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This file may be included in software not adhering to the GPL.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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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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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, MA 02111-1307 USA
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*/
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#ifndef SPI_H
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#define SPI_H
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#include <config.h>
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#include <common.h>
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#include <asm/errno.h>
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#include <asm/arch/hardware.h>
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#define SPIF 0x80
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#define spi_lock() disable_interrupts();
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#define spi_unlock() enable_interrupts();
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extern unsigned long spi_flags;
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extern unsigned char spi_idle;
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int spi_init(void);
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static inline unsigned char spi_read(void)
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{
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unsigned char b;
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PUT8(S0SPDR, spi_idle);
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while (!(GET8(S0SPSR) & SPIF));
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b = GET8(S0SPDR);
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return b;
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}
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static inline void spi_write(unsigned char b)
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{
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PUT8(S0SPDR, b);
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while (!(GET8(S0SPSR) & SPIF));
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GET8(S0SPDR); /* this will clear the SPIF bit */
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}
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static inline void spi_set_clock(unsigned char clk_value)
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{
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PUT8(S0SPCCR, clk_value);
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}
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static inline void spi_set_cfg(unsigned char phase,
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unsigned char polarity,
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unsigned char lsbf)
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{
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unsigned char v = 0x20; /* master bit set */
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if (phase)
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v |= 0x08; /* set phase bit */
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if (polarity) {
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v |= 0x10; /* set polarity bit */
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spi_idle = 0xFF;
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} else {
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spi_idle = 0x00;
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}
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if (lsbf)
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v |= 0x40; /* set lsbf bit */
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PUT8(S0SPCR, v);
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}
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#endif /* SPI_H */
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