arch/powerpc/cpu/mpc5xxx/ide.c

   1 /*
   2  * (C) Copyright 2004
   3  * Pierre AUBERT, Staubli Faverges, <p.aubert@staubli.com>
   4  *
   5  * SPDX-License-Identifier:     GPL-2.0+
   6  *
   7  * Init is derived from Linux code.
   8  */
   9 #include <common.h>
  10
  11 #if defined(CONFIG_IDE)
  12 #include <mpc5xxx.h>
  13
  14 DECLARE_GLOBAL_DATA_PTR;
  15
  16 #define CALC_TIMING(t) (t + period - 1) / period
  17
  18 #ifdef CONFIG_IDE_RESET
  19 extern void init_ide_reset (void);
  20 #endif
  21
  22 int ide_preinit (void)
  23 {
  24         long period, t0, t1, t2_8, t2_16, t4, ta;
  25         vu_long reg;
  26         struct mpc5xxx_sdma *psdma = (struct mpc5xxx_sdma *) MPC5XXX_SDMA;
  27
  28         reg = *(vu_long *) MPC5XXX_GPS_PORT_CONFIG;
  29 #if defined(CONFIG_SYS_ATA_CS_ON_I2C2)
  30         /* ATA cs0/1 on i2c2 clk/io */
  31         reg = (reg & ~0x03000000ul) | 0x02000000ul;
  32 #elif defined(CONFIG_SYS_ATA_CS_ON_TIMER01)
  33         /* ATA cs0/1 on Timer 0/1 */
  34         reg = (reg & ~0x03000000ul) | 0x03000000ul;
  35 #else
  36         /* ATA cs0/1 on Local Plus cs4/5 */
  37         reg = (reg & ~0x03000000ul) | 0x01000000ul;
  38 #endif  /* CONFIG_TOTAL5200 */
  39         *(vu_long *) MPC5XXX_GPS_PORT_CONFIG = reg;
  40
  41         /* All sample codes do that... */
  42         *(vu_long *) MPC5XXX_ATA_SHARE_COUNT = 0;
  43
  44         /* Configure and reset host */
  45         *(vu_long *) MPC5XXX_ATA_HOST_CONFIG = MPC5xxx_ATA_HOSTCONF_IORDY |
  46                 MPC5xxx_ATA_HOSTCONF_SMR | MPC5xxx_ATA_HOSTCONF_FR;
  47         udelay (10);
  48         *(vu_long *) MPC5XXX_ATA_HOST_CONFIG = MPC5xxx_ATA_HOSTCONF_IORDY;
  49
  50         /* Disable prefetch on Commbus */
  51         psdma->PtdCntrl |= 1;
  52
  53         /* Init timings : we use PIO mode 0 timings */
  54         period = 1000000000 / gd->arch.ipb_clk; /* period in ns */
  55
  56         t0 = CALC_TIMING (600);
  57         t2_8 = CALC_TIMING (290);
  58         t2_16 = CALC_TIMING (165);
  59         reg = (t0 << 24) | (t2_8 << 16) | (t2_16 << 8);
  60         *(vu_long *) MPC5XXX_ATA_PIO1 = reg;
  61
  62         t4 = CALC_TIMING (30);
  63         t1 = CALC_TIMING (70);
  64         ta = CALC_TIMING (35);
  65         reg = (t4 << 24) | (t1 << 16) | (ta << 8);
  66
  67         *(vu_long *) MPC5XXX_ATA_PIO2 = reg;
  68
  69 #ifdef CONFIG_IDE_RESET
  70         init_ide_reset ();
  71 #endif /* CONFIG_IDE_RESET */
  72
  73         return (0);
  74 }
  75 #endif