LXR uboot/include/asm-arm/arch-lpc2292/spi.h

   1/*
   2    This file defines the interface to the lpc22xx SPI module.
   3    Copyright (C) 2006  Embedded Artists AB (www.embeddedartists.com)
   4
   5    This file may be included in software not adhering to the GPL.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  20*/
  21
  22#ifndef SPI_H
  23#define SPI_H
  24
  25#include <config.h>
  26#include <common.h>
  27#include <asm/errno.h>
  28#include <asm/arch/hardware.h>
  29
  30#define SPIF 0x80
  31
  32#define spi_lock() disable_interrupts();
  33#define spi_unlock() enable_interrupts();
  34
  35extern unsigned long spi_flags;
  36extern unsigned char spi_idle;
  37
  38int spi_init(void);
  39
  40static inline unsigned char spi_read(void)
  41{
  42        unsigned char b;
  43
  44        PUT8(S0SPDR, spi_idle);
  45        while (!(GET8(S0SPSR) & SPIF));
  46        b = GET8(S0SPDR);
  47
  48        return b;
  49}
  50
  51static inline void spi_write(unsigned char b)
  52{
  53        PUT8(S0SPDR, b);
  54        while (!(GET8(S0SPSR) & SPIF));
  55        GET8(S0SPDR);           /* this will clear the SPIF bit */
  56}
  57
  58static inline void spi_set_clock(unsigned char clk_value)
  59{
  60        PUT8(S0SPCCR, clk_value);
  61}
  62
  63static inline void spi_set_cfg(unsigned char phase,
  64                               unsigned char polarity,
  65                               unsigned char lsbf)
  66{
  67        unsigned char v = 0x20; /* master bit set */
  68
  69        if (phase)
  70                v |= 0x08;                      /* set phase bit */
  71        if (polarity) {
  72                v |= 0x10;                      /* set polarity bit */
  73                spi_idle = 0xFF;
  74        } else {
  75                spi_idle = 0x00;
  76        }
  77        if (lsbf)
  78                v |= 0x40;                      /* set lsbf bit */
  79
  80        PUT8(S0SPCR, v);
  81}
  82#endif /* SPI_H */
  83