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rockbox/firmware/target/arm/imx31/ata-imx31.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2007 by Will Robertson
*
* 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 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 "ata-defines.h"
#include "ata-target.h"
#include "ccm-imx31.h"
#ifdef HAVE_ATA_DMA
#include "sdma-imx31.h"
#include "mmu-imx31.h"
#endif
/* PIO modes timing info */
static const struct ata_pio_timings
{
uint16_t time_2w; /* t2 during write */
uint16_t time_2r; /* t2 during read */
uint8_t time_ax; /* tA */
uint8_t time_1; /* t1 */
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_ax = 35,
.time_4 = 30,
.time_9 = 20
},
[1] = /* PIO mode 1 */
{
.time_1 = 50,
.time_2w = 290,
.time_2r = 290,
.time_ax = 35,
.time_4 = 20,
.time_9 = 15
},
[2] = /* PIO mode 2 */
{
.time_1 = 30,
.time_2w = 290,
.time_2r = 290,
.time_ax = 35,
.time_4 = 15,
.time_9 = 10
},
[3] = /* PIO mode 3 */
{
.time_1 = 30,
.time_2w = 80,
.time_2r = 80,
.time_ax = 35,
.time_4 = 10,
.time_9 = 10
},
[4] = /* PIO mode 4 */
{
.time_1 = 25,
.time_2w = 70,
.time_2r = 70,
.time_ax = 35,
.time_4 = 10,
.time_9 = 10
}
};
/* Track first init */
static bool initialized = false;
#ifdef HAVE_ATA_DMA
/* One DMA channel for reads, the other for writes othewise one channel would
* have to be reinitialized every time the direction changed. (Different
* SDMA scripts are used for reading or writing) */
#define ATA_DMA_CH_NUM_RD 3
#define ATA_DMA_CH_NUM_WR 4
/* Use default priority for these channels (1) - ATA isn't realtime urgent. */
/* Maximum DMA size per buffer descriptor (32-byte aligned) */
#define ATA_MAX_BD_SIZE (65534 & ~31) /* 65504 */
/* Number of buffer descriptors required for a maximum sector count trasfer.
* NOTE: Assumes LBA28 and 512-byte sectors! */
#define ATA_BASE_BD_COUNT ((256*512 + (ATA_MAX_BD_SIZE-1)) / ATA_MAX_BD_SIZE)
#define ATA_BD_COUNT (ATA_BASE_BD_COUNT + 2)
static const struct ata_mdma_timings
{
uint8_t time_m; /* tM */
uint8_t time_jn; /* tH */
uint8_t time_d; /* tD */
uint8_t time_k; /* tKW */
} mdma_timings[] =
{
[0] = /* MDMA mode 0 */
{
.time_m = 50,
.time_jn = 20,
.time_d = 215,
.time_k = 215
},
[1] = /* MDMA mode 1 */
{
.time_m = 30,
.time_jn = 15,
.time_d = 80,
.time_k = 50
},
[2] = /* MDMA mode 2 */
{
.time_m = 25,
.time_jn = 10,
.time_d = 70,
.time_k = 25
}
};
static const struct ata_udma_timings
{
uint8_t time_ack; /* tACK */
uint8_t time_env; /* tENV */
uint8_t time_rpx; /* tRP */
uint8_t time_zah; /* tZAH */
uint8_t time_mlix; /* tMLI */
uint8_t time_dvh; /* tDVH */
uint8_t time_dzfs; /* tDVS+tDVH? */
uint8_t time_dvs; /* tDVS */
uint8_t time_cvh; /* ?? */
uint8_t time_ss; /* tSS */
uint8_t time_cyc; /* tCYC */
} udma_timings[] =
{
[0] = /* UDMA mode 0 */
{
.time_ack = 20,
.time_env = 20,
.time_rpx = 160,
.time_zah = 20,
.time_mlix = 20,
.time_dvh = 6,
.time_dzfs = 80,
.time_dvs = 70,
.time_cvh = 6,
.time_ss = 50,
.time_cyc = 114
},
[1] = /* UDMA mode 1 */
{
.time_ack = 20,
.time_env = 20,
.time_rpx = 125,
.time_zah = 20,
.time_mlix = 20,
.time_dvh = 6,
.time_dzfs = 63,
.time_dvs = 48,
.time_cvh = 6,
.time_ss = 50,
.time_cyc = 75
},
[2] = /* UDMA mode 2 */
{
.time_ack = 20,
.time_env = 20,
.time_rpx = 100,
.time_zah = 20,
.time_mlix = 20,
.time_dvh = 6,
.time_dzfs = 47,
.time_dvs = 34,
.time_cvh = 6,
.time_ss = 50,
.time_cyc = 55
},
[3] = /* UDMA mode 3 */
{
.time_ack = 20,
.time_env = 20,
.time_rpx = 100,
.time_zah = 20,
.time_mlix = 20,
.time_dvh = 6,
.time_dzfs = 35,
.time_dvs = 20,
.time_cvh = 6,
.time_ss = 50,
.time_cyc = 39
},
[4] = /* UDMA mode 4 */
{
.time_ack = 20,
.time_env = 20,
.time_rpx = 100,
.time_zah = 20,
.time_mlix = 20,
.time_dvh = 6,
.time_dzfs = 25,
.time_dvs = 7,
.time_cvh = 6,
.time_ss = 50,
.time_cyc = 25
},
#if 0
[5] = /* UDMA mode 5 (bus clock 80MHz or higher only) */
{
.time_ack = 20,
.time_env = 20,
.time_rpx = 85,
.time_zah = 20,
.time_mlix = 20,
.time_dvh = 6,
.time_dzfs = 40,
.time_dvs = 5,
.time_cvh = 10,
.time_ss = 50,
.time_cyc = 17
}
#endif
};
/** Threading **/
/* Signal to tell thread when DMA is done */
static struct semaphore ata_dma_complete;
/** SDMA **/
/* Array of buffer descriptors for large transfers and alignnment */
static struct buffer_descriptor ata_bda[ATA_BD_COUNT] NOCACHEBSS_ATTR;
/* ATA channel descriptors */
/* Read/write channels share buffer descriptors and callbacks */
static void ata_dma_callback(void);
static struct channel_descriptor ata_cd_rd = /* read channel */
{
.bd_count = ATA_BD_COUNT,
.callback = ata_dma_callback,
.shp_addr = SDMA_PER_ADDR_ATA_RX,
.wml = SDMA_ATA_WML,
.per_type = SDMA_PER_ATA,
.tran_type = SDMA_TRAN_PER_2_EMI,
.event_id1 = SDMA_REQ_ATA_TXFER_END,
.event_id2 = SDMA_REQ_ATA_RX,
};
static struct channel_descriptor ata_cd_wr = /* write channel */
{
.bd_count = ATA_BD_COUNT,
.callback = ata_dma_callback,
.shp_addr = SDMA_PER_ADDR_ATA_TX,
.wml = SDMA_ATA_WML,
.per_type = SDMA_PER_ATA,
.tran_type = SDMA_TRAN_EMI_2_PER,
.event_id1 = SDMA_REQ_ATA_TXFER_END,
.event_id2 = SDMA_REQ_ATA_TX,
};
/* DMA channel to be started for transfer */
static unsigned int current_channel = 0;
/** Buffers **/
/* Scatter buffer for first and last 32 bytes of a non cache-aligned transfer
* to cached RAM. */
static uint32_t scatter_buffer[32/4*2] NOCACHEBSS_ATTR;
/* Address of ends in destination buffer for unaligned reads - copied after
* DMA completes. */
static void *sb_dst[2] = { NULL, NULL };
/** Modes **/
#define ATA_DMA_MWDMA 0x00000000 /* Using multiword DMA */
#define ATA_DMA_UDMA ATA_DMA_ULTRA_SELECTED /* Using Ultra DMA */
#define ATA_DMA_PIO 0x80000000 /* Using PIO */
#define ATA_DMA_DISABLED 0x80000001 /* DMA init error - use PIO */
static unsigned long ata_dma_selected = ATA_DMA_PIO;
#endif /* HAVE_ATA_DMA */
static unsigned int get_T(void)
{
/* T = ATA clock period in nanoseconds */
return 1000 * 1000 * 1000 / ccm_get_ata_clk();
}
static void ata_wait_for_idle(void)
{
while (!(ATA_INTERRUPT_PENDING & ATA_CONTROLLER_IDLE));
}
/* Route the INTRQ to either the MCU or SDMA depending upon whether there is
* a DMA transfer in progress. */
static inline void ata_set_intrq(bool to_dma)
{
ATA_INTERRUPT_ENABLE =
(ATA_INTERRUPT_ENABLE & ~(ATA_INTRQ1 | ATA_INTRQ2)) |
(to_dma ? ATA_INTRQ1 : ATA_INTRQ2);
}
/* Setup the timing for PIO mode */
void ata_set_pio_timings(int mode)
{
const struct ata_pio_timings * const timings = &pio_timings[mode];
unsigned int T = get_T();
ata_wait_for_idle();
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 = (timings->time_ax + T) / T + 2; /* 1.5 + tAX */
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)
{
/* Be sure we're not busy */
ata_wait_for_idle();
ATA_INTF_CONTROL &= ~(ATA_ATA_RST | ATA_FIFO_RST);
sleep(HZ/100);
ATA_INTF_CONTROL = ATA_ATA_RST | ATA_FIFO_RST;
sleep(HZ/100);
ata_wait_for_idle();
}
void ata_enable(bool on)
{
/* Unconditionally clock module before writing regs */
ccm_module_clock_gating(CG_ATA, CGM_ON_RUN_WAIT);
ata_wait_for_idle();
if (on)
{
ATA_INTF_CONTROL = ATA_ATA_RST | ATA_FIFO_RST;
sleep(HZ/100);
}
else
{
ATA_INTF_CONTROL &= ~(ATA_ATA_RST | ATA_FIFO_RST);
sleep(HZ/100);
/* Disable off - unclock ATA module */
ccm_module_clock_gating(CG_ATA, CGM_OFF);
}
}
bool ata_is_coldstart(void)
{
return false;
}
#ifdef HAVE_ATA_DMA
static void ata_set_mdma_timings(unsigned int mode)
{
const struct ata_mdma_timings * const timings = &mdma_timings[mode];
unsigned int T = get_T();
ATA_TIME_M = (timings->time_m + T) / T;
ATA_TIME_JN = (timings->time_jn + T) / T;
ATA_TIME_D = (timings->time_d + T) / T;
ATA_TIME_K = (timings->time_k + T) / T;
}
static void ata_set_udma_timings(unsigned int mode)
{
const struct ata_udma_timings * const timings = &udma_timings[mode];
unsigned int T = get_T();
ATA_TIME_ACK = (timings->time_ack + T) / T;
ATA_TIME_ENV = (timings->time_env + T) / T;
ATA_TIME_RPX = (timings->time_rpx + T) / T;
ATA_TIME_ZAH = (timings->time_zah + T) / T;
ATA_TIME_MLIX = (timings->time_mlix + T) / T;
ATA_TIME_DVH = (timings->time_dvh + T) / T + 1;
ATA_TIME_DZFS = (timings->time_dzfs + T) / T;
ATA_TIME_DVS = (timings->time_dvs + T) / T;
ATA_TIME_CVH = (timings->time_cvh + T) / T;
ATA_TIME_SS = (timings->time_ss + T) / T;
ATA_TIME_CYC = (timings->time_cyc + T) / T;
}
void ata_dma_set_mode(unsigned char mode)
{
unsigned int modeidx = mode & 0x07;
unsigned int dmamode = mode & 0xf8;
ata_wait_for_idle();
if (ata_dma_selected == ATA_DMA_DISABLED)
{
/* Configuration error - no DMA */
}
else if (dmamode == 0x40 && modeidx <= ATA_MAX_UDMA)
{
/* Using Ultra DMA */
ata_set_udma_timings(dmamode);
ata_dma_selected = ATA_DMA_UDMA;
}
else if (dmamode == 0x20 && modeidx <= ATA_MAX_MWDMA)
{
/* Using Multiword DMA */
ata_set_mdma_timings(dmamode);
ata_dma_selected = ATA_DMA_MWDMA;
}
else
{
/* Don't understand this - force PIO. */
ata_dma_selected = ATA_DMA_PIO;
}
}
/* Called by SDMA when transfer is complete */
static void ata_dma_callback(void)
{
/* Clear FIFO if not empty - shouldn't happen */
while (ATA_FIFO_FILL != 0)
ATA_FIFO_DATA_32;
/* Clear FIFO interrupts (the only ones that can be) */
ATA_INTERRUPT_CLEAR = ATA_INTERRUPT_PENDING;
ata_set_intrq(false); /* Return INTRQ to MCU */
semaphore_release(&ata_dma_complete); /* Signal waiting thread */
}
bool ata_dma_setup(void *addr, unsigned long bytes, bool write)
{
struct buffer_descriptor *bd_p;
unsigned char *buf;
if (UNLIKELY(bytes > ATA_BASE_BD_COUNT*ATA_MAX_BD_SIZE ||
(ata_dma_selected & ATA_DMA_PIO)))
{
/* Too much? Implies BD count should be reevaluated since this
* shouldn't be reached based upon size. Otherwise we simply didn't
* understand the DMA mode setup. Force PIO in both cases. */
ATA_INTF_CONTROL = ATA_FIFO_RST | ATA_ATA_RST;
yield();
return false;
}
bd_p = &ata_bda[0];
buf = (unsigned char *)addr_virt_to_phys((unsigned long)addr);
sb_dst[0] = NULL; /* Assume not needed */
if (write)
{
/* No cache alignment concerns */
current_channel = ATA_DMA_CH_NUM_WR;
if (LIKELY(buf != addr))
{
/* addr is virtual */
clean_dcache_range(addr, bytes);
}
/* Setup ATA controller for DMA transmit */
ATA_INTF_CONTROL = ATA_FIFO_RST | ATA_ATA_RST | ATA_FIFO_TX_EN |
ATA_DMA_PENDING | ata_dma_selected | ATA_DMA_WRITE;
ATA_FIFO_ALARM = SDMA_ATA_WML / 2;
}
else
{
current_channel = ATA_DMA_CH_NUM_RD;
/* Setup ATA controller for DMA receive */
ATA_INTF_CONTROL = ATA_FIFO_RST | ATA_ATA_RST | ATA_FIFO_RCV_EN |
ATA_DMA_PENDING | ata_dma_selected;
ATA_FIFO_ALARM = SDMA_ATA_WML / 2;
if (LIKELY(buf != addr))
{
/* addr is virtual */
dump_dcache_range(addr, bytes);
if ((unsigned long)addr & 31)
{
/* Not cache aligned, must use scatter buffers for first and
* last 32 bytes. */
unsigned char *bufstart = buf;
sb_dst[0] = addr;
bd_p->buf_addr = scatter_buffer;
bd_p->mode.count = 32;
bd_p->mode.status = BD_DONE | BD_CONT;
buf += 32;
bytes -= 32;
bd_p++;
while (bytes > ATA_MAX_BD_SIZE)
{
bd_p->buf_addr = buf;
bd_p->mode.count = ATA_MAX_BD_SIZE;
bd_p->mode.status = BD_DONE | BD_CONT;
buf += ATA_MAX_BD_SIZE;
bytes -= ATA_MAX_BD_SIZE;
bd_p++;
}
if (bytes > 32)
{
unsigned long size = bytes - 32;
bd_p->buf_addr = buf;
bd_p->mode.count = size;
bd_p->mode.status = BD_DONE | BD_CONT;
buf += size;
bd_p++;
}
/* There will be exactly 32 bytes left */
/* Final buffer - wrap to base bd, interrupt */
sb_dst[1] = addr + (buf - bufstart);
bd_p->buf_addr = &scatter_buffer[32/4];
bd_p->mode.count = 32;
bd_p->mode.status = BD_DONE | BD_WRAP | BD_INTR;
return true;
}
}
}
/* Setup buffer descriptors for both cache-aligned reads and all write
* operations. */
while (bytes > ATA_MAX_BD_SIZE)
{
bd_p->buf_addr = buf;
bd_p->mode.count = ATA_MAX_BD_SIZE;
bd_p->mode.status = BD_DONE | BD_CONT;
buf += ATA_MAX_BD_SIZE;
bytes -= ATA_MAX_BD_SIZE;
bd_p++;
}
/* Final buffer - wrap to base bd, interrupt */
bd_p->buf_addr = buf;
bd_p->mode.count = bytes;
bd_p->mode.status = BD_DONE | BD_WRAP | BD_INTR;
return true;
}
bool ata_dma_finish(void)
{
unsigned int channel = current_channel;
long timeout = current_tick + HZ*10;
current_channel = 0;
ata_set_intrq(true); /* Give INTRQ to DMA */
sdma_channel_run(channel); /* Kick the channel to wait for events */
while (1)
{
int oldirq;
if (LIKELY(semaphore_wait(&ata_dma_complete, HZ/2)
== OBJ_WAIT_SUCCEEDED))
break;
ata_keep_active();
if (TIME_BEFORE(current_tick, timeout))
continue;
/* Epic fail - timed out - maybe. */
oldirq = disable_irq_save();
ata_set_intrq(false); /* Strip INTRQ from DMA */
sdma_channel_stop(channel); /* Stop DMA */
restore_irq(oldirq);
if (semaphore_wait(&ata_dma_complete, TIMEOUT_NOBLOCK)
== OBJ_WAIT_SUCCEEDED)
break; /* DMA really did finish after timeout */
sdma_channel_reset(channel); /* Reset everything + clear error */
return false;
}
if (sdma_channel_is_error(channel))
{
/* Channel error in one or more descriptors */
sdma_channel_reset(channel); /* Reset everything + clear error */
return false;
}
if (sb_dst[0] != NULL)
{
/* NOTE: This requires that unaligned access support be enabled! */
register void *sbs = scatter_buffer;
register void *sbd0 = sb_dst[0];
register void *sbd1 = sb_dst[1];
asm volatile(
"add r0, %1, #32 \n" /* Prefetch at DMA-direct boundaries */
"mcrr p15, 2, r0, r0, c12 \n"
"mcrr p15, 2, %2, %2, c12 \n"
"ldmia %0!, { r0-r3 } \n" /* Copy the 32-bytes to destination */
"str r0, [%1], #4 \n" /* stmia doesn't work unaligned */
"str r1, [%1], #4 \n"
"str r2, [%1], #4 \n"
"str r3, [%1], #4 \n"
"ldmia %0!, { r0-r3 } \n"
"str r0, [%1], #4 \n"
"str r1, [%1], #4 \n"
"str r2, [%1], #4 \n"
"str r3, [%1] \n"
"ldmia %0!, { r0-r3 } \n" /* Copy the 32-bytes to destination */
"str r0, [%2], #4 \n" /* stmia doesn't work unaligned */
"str r1, [%2], #4 \n"
"str r2, [%2], #4 \n"
"str r3, [%2], #4 \n"
"ldmia %0!, { r0-r3 } \n"
"str r0, [%2], #4 \n"
"str r1, [%2], #4 \n"
"str r2, [%2], #4 \n"
"str r3, [%2] \n"
: "+r"(sbs), "+r"(sbd0), "+r"(sbd1)
:
: "r0", "r1", "r2", "r3");
}
return true;
}
#endif /* HAVE_ATA_DMA */
static int ata_wait_status(unsigned status, unsigned mask, int timeout)
{
long busy_timeout = usec_timer() + 2;
long end_tick = current_tick + timeout;
while (1)
{
if ((ATA_DRIVE_STATUS & mask) == status)
return 1;
if (!TIME_AFTER(usec_timer(), busy_timeout))
continue;
ata_keep_active();
if (TIME_AFTER(current_tick, end_tick))
break;
sleep(0);
busy_timeout = usec_timer() + 2;
}
return 0; /* timed out */
}
int ata_wait_for_bsy(void)
{
/* BSY = 0 */
return ata_wait_status(0, STATUS_BSY, 30*HZ);
}
int ata_wait_for_rdy(void)
{
/* RDY = 1 && BSY = 0 */
return ata_wait_status(STATUS_RDY, STATUS_RDY | STATUS_BSY, 40*HZ);
}
void ata_device_init(void)
{
/* Make sure we're not in reset mode */
ata_enable(true);
if (!initialized)
{
ATA_INTERRUPT_ENABLE = 0;
ATA_INTERRUPT_CLEAR = ATA_INTERRUPT_PENDING;
}
ata_set_intrq(false);
if (initialized)
return;
/* All modes use same tOFF/tON */
ATA_TIME_OFF = 3;
ATA_TIME_ON = 3;
/* Setup mode 0 for all by default
* Mode may be switched later once identify info is ready in which
* case the main driver calls back */
ata_set_pio_timings(0);
#ifdef HAVE_ATA_DMA
ata_set_mdma_timings(0);
ata_set_udma_timings(0);
ata_dma_selected = ATA_DMA_PIO;
/* Called for first time at startup */
semaphore_init(&ata_dma_complete, 1, 0);
if (!sdma_channel_init(ATA_DMA_CH_NUM_RD, &ata_cd_rd, ata_bda) ||
!sdma_channel_init(ATA_DMA_CH_NUM_WR, &ata_cd_wr, ata_bda))
{
/* Channel init error - disable DMA forever */
ata_dma_selected = ATA_DMA_DISABLED;
}
#endif /* HAVE_ATA_DMA */
initialized = true;
}
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