LXR uboot/arch/powerpc/cpu/mpc512x/ide.c

   1/*
   2 * (C) Copyright 2007-2009 DENX Software Engineering
   3 *
   4 * See file CREDITS for list of people who contributed to this
   5 * project.
   6 *
   7 * This program is free software; you can redistribute it and/or
   8 * modify it under the terms of the GNU General Public License as
   9 * published by the Free Software Foundation; either version 2 of
  10 * the License, or (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,
  20 * MA 02111-1307 USA
  21 *
  22 */
  23
  24#include <common.h>
  25#include <command.h>
  26#include <asm/io.h>
  27#include <asm/processor.h>
  28
  29DECLARE_GLOBAL_DATA_PTR;
  30
  31#if defined(CONFIG_IDE_RESET)
  32
  33void ide_set_reset (int idereset)
  34{
  35        volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
  36        debug ("ide_set_reset(%d)\n", idereset);
  37
  38        if (idereset) {
  39                out_be32(&im->pata.pata_ata_control, 0);
  40        } else {
  41                out_be32(&im->pata.pata_ata_control, FSL_ATA_CTRL_ATA_RST_B);
  42        }
  43        udelay(100);
  44}
  45
  46void init_ide_reset (void)
  47{
  48        debug ("init_ide_reset\n");
  49
  50        /*
  51         * Clear the reset bit to reset the interface
  52         * cf. RefMan MPC5121EE: 28.4.1 Resetting the ATA Bus
  53         */
  54        ide_set_reset(1);
  55
  56        /* Assert the reset bit to enable the interface */
  57        ide_set_reset(0);
  58
  59}
  60
  61#define CALC_TIMING(t) (t + period - 1) / period
  62
  63int ide_preinit (void)
  64{
  65        volatile immap_t *im = (immap_t *) CONFIG_SYS_IMMR;
  66        long t;
  67        const struct {
  68                short t0;
  69                short t1;
  70                short t2_8;
  71                short t2_16;
  72                short t2i;
  73                short t4;
  74                short t9;
  75                short tA;
  76        } pio_specs = {
  77                .t0    = 600,
  78                .t1    =  70,
  79                .t2_8  = 290,
  80                .t2_16 = 165,
  81                .t2i   =   0,
  82                .t4    =  30,
  83                .t9    =  20,
  84                .tA    =  50,
  85        };
  86        union {
  87                u32 config;
  88                struct {
  89                        u8 field1;
  90                        u8 field2;
  91                        u8 field3;
  92                        u8 field4;
  93                }bytes;
  94        } cfg;
  95
  96        debug ("IDE preinit using PATA peripheral at IMMR-ADDR %08x\n",
  97                (u32)&im->pata);
  98
  99        /* Set the reset bit to 1 to enable the interface */
 100        ide_set_reset(0);
 101
 102        /* Init timings : we use PIO mode 0 timings */
 103        t = 1000000000 / gd->ips_clk;   /* period in ns */
 104        cfg.bytes.field1 = 3;
 105        cfg.bytes.field2 = 3;
 106        cfg.bytes.field3 = (pio_specs.t1 + t) / t;
 107        cfg.bytes.field4 = (pio_specs.t2_8 + t) / t;
 108
 109        out_be32(&im->pata.pata_time1, cfg.config);
 110
 111        cfg.bytes.field1 = (pio_specs.t2_8 + t) / t;
 112        cfg.bytes.field2 = (pio_specs.tA + t) / t + 2;
 113        cfg.bytes.field3 = 1;
 114        cfg.bytes.field4 = (pio_specs.t4 + t) / t;
 115
 116        out_be32(&im->pata.pata_time2, cfg.config);
 117
 118        cfg.config = in_be32(&im->pata.pata_time3);
 119        cfg.bytes.field1 = (pio_specs.t9 + t) / t;
 120
 121        out_be32(&im->pata.pata_time3, cfg.config);
 122
 123        debug ("PATA preinit complete.\n");
 124
 125        return 0;
 126}
 127
 128#endif /* defined(CONFIG_IDE_RESET) */
 129