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/*
* (C) Copyright 2007-2009 DENX Software Engineering
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*
*/
#include <common.h>
#include <command.h>
#include <asm/processor.h>
DECLARE_GLOBAL_DATA_PTR;
#if defined(CONFIG_IDE_RESET)
void init_ide_reset (void)
{
volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;
debug ("init_ide_reset\n");
/*
* Clear the reset bit to reset the interface
* cf. RefMan MPC5121EE: 28.4.1 Resetting the ATA Bus
*/
immr->pata.pata_ata_control = 0;
udelay(100);
/* Assert the reset bit to enable the interface */
immr->pata.pata_ata_control = FSL_ATA_CTRL_ATA_RST_B;
udelay(100);
}
void ide_set_reset (int idereset)
{
volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;
debug ("ide_set_reset(%d)\n", idereset);
if (idereset) {
immr->pata.pata_ata_control = 0;
udelay(100);
} else {
immr->pata.pata_ata_control = FSL_ATA_CTRL_ATA_RST_B;
udelay(100);
}
}
#define CALC_TIMING(t) (t + period - 1) / period
int ide_preinit (void)
{
volatile immap_t *immr = (immap_t *) CONFIG_SYS_IMMR;
long t;
const struct {
short t0;
short t1;
short t2_8;
short t2_16;
short t2i;
short t4;
short t9;
short tA;
} pio_specs = {
.t0 = 600,
.t1 = 70,
.t2_8 = 290,
.t2_16 = 165,
.t2i = 0,
.t4 = 30,
.t9 = 20,
.tA = 50,
};
union {
u32 config;
struct {
u8 field1;
u8 field2;
u8 field3;
u8 field4;
}bytes;
}cfg;
debug ("IDE preinit using PATA peripheral at IMMR-ADDR %08x\n",
(u32)&immr->pata);
/* Set the reset bit to 1 to enable the interface */
immr->pata.pata_ata_control = FSL_ATA_CTRL_ATA_RST_B;
/* Init timings : we use PIO mode 0 timings */
t = 1000000000 / gd->ips_clk; /* period in ns */
cfg.bytes.field1 = 3;
cfg.bytes.field2 = 3;
cfg.bytes.field3 = (pio_specs.t1 + t) / t;
cfg.bytes.field4 = (pio_specs.t2_8 + t) / t;
immr->pata.pata_time1 = cfg.config;
cfg.bytes.field1 = (pio_specs.t2_8 + t) / t;
cfg.bytes.field2 = (pio_specs.tA + t) / t + 2;
cfg.bytes.field3 = 1;
cfg.bytes.field4 = (pio_specs.t4 + t) / t;
immr->pata.pata_time2 = cfg.config;
cfg.config = immr->pata.pata_time3;
cfg.bytes.field1 = (pio_specs.t9 + t) / t;
immr->pata.pata_time3 = cfg.config;
debug ("PATA preinit complete.\n");
return 0;
}
#endif /* defined(CONFIG_IDE_RESET) */
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