2d8813e26b
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@20169 a1c6a512-1295-4272-9138-f99709370657
166 lines
4 KiB
C
166 lines
4 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2007 by Will Robertson
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include "cpu.h"
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#include "kernel.h"
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#include "thread.h"
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#include "system.h"
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#include "power.h"
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#include "panic.h"
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#include "ata.h"
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#include "ata-target.h"
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#include "clkctl-imx31.h"
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static const struct ata_pio_timings
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{
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uint16_t time_2w; /* t2 during write */
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uint16_t time_2r; /* t2 during read */
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uint8_t time_ax; /* tA */
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uint8_t time_1; /* t1 */
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uint8_t time_4; /* t4 */
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uint8_t time_9; /* t9 */
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} pio_timings[5] =
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{
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[0] = /* PIO mode 0 */
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{
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.time_1 = 70,
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.time_2w = 290,
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.time_2r = 290,
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.time_ax = 35,
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.time_4 = 30,
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.time_9 = 20
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},
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[1] = /* PIO mode 1 */
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{
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.time_1 = 50,
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.time_2w = 290,
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.time_2r = 290,
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.time_ax = 35,
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.time_4 = 20,
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.time_9 = 15
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},
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[2] = /* PIO mode 2 */
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{
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.time_1 = 30,
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.time_2w = 290,
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.time_2r = 290,
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.time_ax = 35,
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.time_4 = 15,
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.time_9 = 10
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},
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[3] = /* PIO mode 3 */
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{
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.time_1 = 30,
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.time_2w = 80,
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.time_2r = 80,
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.time_ax = 35,
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.time_4 = 10,
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.time_9 = 10
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},
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[4] = /* PIO mode 4 */
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{
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.time_1 = 25,
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.time_2w = 70,
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.time_2r = 70,
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.time_ax = 35,
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.time_4 = 10,
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.time_9 = 10
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},
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};
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static int pio_mode = 0; /* Setup mode 0 by default */
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static void ata_wait_for_idle(void)
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{
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while (!(ATA_INTERRUPT_PENDING & ATA_CONTROLLER_IDLE));
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}
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/* Setup the timing for PIO mode */
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void ata_set_pio_timings(int mode)
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{
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ata_wait_for_idle();
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const struct ata_pio_timings * const timings = &pio_timings[mode];
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/* T = period in nanoseconds */
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int T = 1000 * 1000 * 1000 / imx31_clkctl_get_ata_clk();
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pio_mode = mode;
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ATA_TIME_1 = (timings->time_1 + T) / T;
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ATA_TIME_2W = (timings->time_2w + T) / T;
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ATA_TIME_2R = (timings->time_2r + T) / T;
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ATA_TIME_AX = (timings->time_ax + T) / T + 2; /* 1.5 + tAX */
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ATA_TIME_PIO_RDX = 1;
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ATA_TIME_4 = (timings->time_4 + T) / T;
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ATA_TIME_9 = (timings->time_9 + T) / T;
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}
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void ata_reset(void)
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{
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/* Be sure we're not busy */
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ata_wait_for_idle();
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ATA_INTF_CONTROL &= ~ATA_ATA_RST;
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sleep(1);
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ATA_INTF_CONTROL |= ATA_ATA_RST;
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sleep(1);
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ata_wait_for_idle();
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}
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void ata_enable(bool on)
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{
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/* Unconditionally clock module before writing regs */
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imx31_clkctl_module_clock_gating(CG_ATA, CGM_ON_ALL);
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if (on)
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{
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ATA_INTF_CONTROL |= ATA_ATA_RST;
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}
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else
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{
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ata_wait_for_idle();
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ATA_INTF_CONTROL &= ~ATA_ATA_RST;
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/* Disable off - unclock ATA module */
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imx31_clkctl_module_clock_gating(CG_ATA, CGM_OFF);
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}
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}
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bool ata_is_coldstart(void)
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{
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return true;
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}
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void ata_device_init(void)
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{
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/* Make sure we're not in reset mode */
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ata_enable(true);
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/* All modes use same tOFF/tON */
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ATA_TIME_OFF = 3;
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ATA_TIME_ON = 3;
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/* mode may be switched later once identify info is ready in which
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* case the main driver calls back */
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ata_set_pio_timings(pio_mode);
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}
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