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
  29 DECLARE_GLOBAL_DATA_PTR;
  30
  31 #if defined(CONFIG_IDE_RESET)
  32
  33 void 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
  46 void 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
  63 int 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) */