cpu/mpc5xxx/ide.c

   1 /*
   2  * (C) Copyright 2004
   3  * Pierre AUBERT, Staubli Faverges, <p.aubert@staubli.com>
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  *
  23  * Init is derived from Linux code.
  24  */
  25 #include <common.h>
  26
  27 #ifdef CFG_CMD_IDE
  28 #include <mpc5xxx.h>
  29
  30 #define CALC_TIMING(t) (t + period - 1) / period
  31
  32 #ifdef CONFIG_IDE_RESET
  33 extern void init_ide_reset (void);
  34 #endif
  35
  36 int ide_preinit (void)
  37 {
  38         DECLARE_GLOBAL_DATA_PTR;
  39         long period, t0, t1, t2_8, t2_16, t4, ta;
  40         vu_long reg;
  41         struct mpc5xxx_sdma *psdma = (struct mpc5xxx_sdma *) MPC5XXX_SDMA;
  42
  43         reg = *(vu_long *) MPC5XXX_GPS_PORT_CONFIG;
  44         reg = (reg & ~0x03000000ul) | 0x01000000ul;
  45         *(vu_long *) MPC5XXX_GPS_PORT_CONFIG = reg;
  46
  47         /* All sample codes do that... */
  48         *(vu_long *) MPC5XXX_ATA_SHARE_COUNT = 0;
  49
  50         /* Configure and reset host */
  51         *(vu_long *) MPC5XXX_ATA_HOST_CONFIG = MPC5xxx_ATA_HOSTCONF_IORDY |
  52                 MPC5xxx_ATA_HOSTCONF_SMR | MPC5xxx_ATA_HOSTCONF_FR;
  53         udelay (10);
  54         *(vu_long *) MPC5XXX_ATA_HOST_CONFIG = MPC5xxx_ATA_HOSTCONF_IORDY;
  55
  56         /* Disable prefetch on Commbus */
  57         psdma->PtdCntrl |= 1;
  58
  59         /* Init timings : we use PIO mode 0 timings */
  60         period = 1000000000 / gd->ipb_clk;      /* period in ns */
  61
  62         t0 = CALC_TIMING (600);
  63         t2_8 = CALC_TIMING (290);
  64         t2_16 = CALC_TIMING (165);
  65         reg = (t0 << 24) | (t2_8 << 16) | (t2_16 << 8);
  66         *(vu_long *) MPC5XXX_ATA_PIO1 = reg;
  67
  68         t4 = CALC_TIMING (30);
  69         t1 = CALC_TIMING (70);
  70         ta = CALC_TIMING (35);
  71         reg = (t4 << 24) | (t1 << 16) | (ta << 8);
  72
  73         *(vu_long *) MPC5XXX_ATA_PIO2 = reg;
  74
  75 #ifdef CONFIG_IDE_RESET
  76         init_ide_reset ();
  77 #endif /* CONFIG_IDE_RESET */
  78
  79         return (0);
  80 }
  81 #endif /* CFG_CMD_IDE */