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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Will Robertson
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "config.h"
#include "cpu.h"
#include "kernel.h"
#include "thread.h"
#include "system.h"
#include "power.h"
#include "panic.h"
#include "ata.h"
#include "clkctl-imx31.h"
static const struct ata_pio_timings
{
uint16_t time_2w; /* t2 during write */
uint16_t time_2r; /* t2 during read */
uint8_t time_1; /* t1 */
uint8_t time_pio_rdx; /* trd */
uint8_t time_4; /* t4 */
uint8_t time_9; /* t9 */
} pio_timings[5] =
{
[0] = /* PIO mode 0 */
{
.time_1 = 70,
.time_2w = 290,
.time_2r = 290,
.time_4 = 30,
.time_9 = 20
},
[1] = /* PIO mode 1 */
{
.time_1 = 50,
.time_2w = 290,
.time_2r = 290,
.time_4 = 20,
.time_9 = 15
},
[2] = /* PIO mode 2 */
{
.time_1 = 30,
.time_2w = 290,
.time_2r = 290,
.time_4 = 15,
.time_9 = 10
},
[3] = /* PIO mode 3 */
{
.time_1 = 30,
.time_2w = 80,
.time_2r = 80,
.time_4 = 10,
.time_9 = 10
},
[4] = /* PIO mode 4 */
{
.time_1 = 25,
.time_2w = 70,
.time_2r = 70,
.time_4 = 10,
.time_9 = 10
},
};
/* Setup the timing for PIO mode */
static void ata_set_pio_mode(int mode)
{
const struct ata_pio_timings * const timings = &pio_timings[mode];
/* T = period in nanoseconds */
int T = 1000 * 1000 * 1000 / imx31_clkctl_get_ata_clk();
while (!(ATA_INTERRUPT_PENDING & ATA_CONTROLLER_IDLE));
ATA_TIME_OFF = 3;
ATA_TIME_ON = 3;
ATA_TIME_1 = (timings->time_1 + T) / T;
ATA_TIME_2W = (timings->time_2w + T) / T;
ATA_TIME_2R = (timings->time_2r + T) / T;
ATA_TIME_AX = (35 + T) / T; /* tA */
ATA_TIME_PIO_RDX = 1;
ATA_TIME_4 = (timings->time_4 + T) / T;
ATA_TIME_9 = (timings->time_9 + T) / T;
}
void ata_reset(void)
{
ATA_INTF_CONTROL &= ~ATA_ATA_RST;
sleep(1);
ATA_INTF_CONTROL |= ATA_ATA_RST;
sleep(1);
while (!(ATA_INTERRUPT_PENDING & ATA_CONTROLLER_IDLE));
}
/* This function is called before enabling the USB bus */
void ata_enable(bool on)
{
(void)on;
}
bool ata_is_coldstart(void)
{
return true;
}
void ata_device_init(void)
{
ATA_INTF_CONTROL |= ATA_ATA_RST; /* Make sure we're not in reset mode */
while (!(ATA_INTERRUPT_PENDING & ATA_CONTROLLER_IDLE));
/* Setup mode 0 by default */
ata_set_pio_mode(0);
}
void ata_identify_ready(void)
{
const unsigned short* identify_info = ata_get_identify();
int mode = 0;
if (identify_info[53] & (1 << 1))
{
/* Set up advanced timings */
if (identify_info[64] & (1 << 1))
mode = 4; /* Mode 0, 1, 2, 3, 4 */
else if (identify_info[64] & (1 << 0))
mode = 3; /* Mode 0, 1, 2, 3 */
else
mode = 2; /* Mode 0, 1, 2 */
}
/* If mode changed, actually set the timings */
if (mode != 0)
{
ata_set_pio_mode(mode);
}
}
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