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qemu/hw/omap_mmc.c

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/*
* OMAP on-chip MMC/SD host emulation.
*
* Copyright (C) 2006-2007 Andrzej Zaborowski <balrog@zabor.org>
*
* 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 or
* (at your option) version 3 of the License.
*
* 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, see <http://www.gnu.org/licenses/>.
*/
#include "hw.h"
#include "omap.h"
#include "sd.h"
struct omap_mmc_s {
qemu_irq irq;
qemu_irq *dma;
qemu_irq coverswitch;
MemoryRegion iomem;
omap_clk clk;
SDState *card;
uint16_t last_cmd;
uint16_t sdio;
uint16_t rsp[8];
uint32_t arg;
int lines;
int dw;
int mode;
int enable;
int be;
int rev;
uint16_t status;
uint16_t mask;
uint8_t cto;
uint16_t dto;
int clkdiv;
uint16_t fifo[32];
int fifo_start;
int fifo_len;
uint16_t blen;
uint16_t blen_counter;
uint16_t nblk;
uint16_t nblk_counter;
int tx_dma;
int rx_dma;
int af_level;
int ae_level;
int ddir;
int transfer;
int cdet_wakeup;
int cdet_enable;
int cdet_state;
qemu_irq cdet;
};
static void omap_mmc_interrupts_update(struct omap_mmc_s *s)
{
qemu_set_irq(s->irq, !!(s->status & s->mask));
}
static void omap_mmc_fifolevel_update(struct omap_mmc_s *host)
{
if (!host->transfer && !host->fifo_len) {
host->status &= 0xf3ff;
return;
}
if (host->fifo_len > host->af_level && host->ddir) {
if (host->rx_dma) {
host->status &= 0xfbff;
qemu_irq_raise(host->dma[1]);
} else
host->status |= 0x0400;
} else {
host->status &= 0xfbff;
qemu_irq_lower(host->dma[1]);
}
if (host->fifo_len < host->ae_level && !host->ddir) {
if (host->tx_dma) {
host->status &= 0xf7ff;
qemu_irq_raise(host->dma[0]);
} else
host->status |= 0x0800;
} else {
qemu_irq_lower(host->dma[0]);
host->status &= 0xf7ff;
}
}
typedef enum {
sd_nore = 0, /* no response */
sd_r1, /* normal response command */
sd_r2, /* CID, CSD registers */
sd_r3, /* OCR register */
sd_r6 = 6, /* Published RCA response */
sd_r1b = -1,
} sd_rsp_type_t;
static void omap_mmc_command(struct omap_mmc_s *host, int cmd, int dir,
sd_cmd_type_t type, int busy, sd_rsp_type_t resptype, int init)
{
uint32_t rspstatus, mask;
int rsplen, timeout;
SDRequest request;
uint8_t response[16];
if (init && cmd == 0) {
host->status |= 0x0001;
return;
}
if (resptype == sd_r1 && busy)
resptype = sd_r1b;
if (type == sd_adtc) {
host->fifo_start = 0;
host->fifo_len = 0;
host->transfer = 1;
host->ddir = dir;
} else
host->transfer = 0;
timeout = 0;
mask = 0;
rspstatus = 0;
request.cmd = cmd;
request.arg = host->arg;
request.crc = 0; /* FIXME */
rsplen = sd_do_command(host->card, &request, response);
/* TODO: validate CRCs */
switch (resptype) {
case sd_nore:
rsplen = 0;
break;
case sd_r1:
case sd_r1b:
if (rsplen < 4) {
timeout = 1;
break;
}
rsplen = 4;
mask = OUT_OF_RANGE | ADDRESS_ERROR | BLOCK_LEN_ERROR |
ERASE_SEQ_ERROR | ERASE_PARAM | WP_VIOLATION |
LOCK_UNLOCK_FAILED | COM_CRC_ERROR | ILLEGAL_COMMAND |
CARD_ECC_FAILED | CC_ERROR | SD_ERROR |
CID_CSD_OVERWRITE;
if (host->sdio & (1 << 13))
mask |= AKE_SEQ_ERROR;
rspstatus = (response[0] << 24) | (response[1] << 16) |
(response[2] << 8) | (response[3] << 0);
break;
case sd_r2:
if (rsplen < 16) {
timeout = 1;
break;
}
rsplen = 16;
break;
case sd_r3:
if (rsplen < 4) {
timeout = 1;
break;
}
rsplen = 4;
rspstatus = (response[0] << 24) | (response[1] << 16) |
(response[2] << 8) | (response[3] << 0);
if (rspstatus & 0x80000000)
host->status &= 0xe000;
else
host->status |= 0x1000;
break;
case sd_r6:
if (rsplen < 4) {
timeout = 1;
break;
}
rsplen = 4;
mask = 0xe000 | AKE_SEQ_ERROR;
rspstatus = (response[2] << 8) | (response[3] << 0);
}
if (rspstatus & mask)
host->status |= 0x4000;
else
host->status &= 0xb000;
if (rsplen)
for (rsplen = 0; rsplen < 8; rsplen ++)
host->rsp[~rsplen & 7] = response[(rsplen << 1) | 1] |
(response[(rsplen << 1) | 0] << 8);
if (timeout)
host->status |= 0x0080;
else if (cmd == 12)
host->status |= 0x0005; /* Makes it more real */
else
host->status |= 0x0001;
}
static void omap_mmc_transfer(struct omap_mmc_s *host)
{
uint8_t value;
if (!host->transfer)
return;
while (1) {
if (host->ddir) {
if (host->fifo_len > host->af_level)
break;
value = sd_read_data(host->card);
host->fifo[(host->fifo_start + host->fifo_len) & 31] = value;
if (-- host->blen_counter) {
value = sd_read_data(host->card);
host->fifo[(host->fifo_start + host->fifo_len) & 31] |=
value << 8;
host->blen_counter --;
}
host->fifo_len ++;
} else {
if (!host->fifo_len)
break;
value = host->fifo[host->fifo_start] & 0xff;
sd_write_data(host->card, value);
if (-- host->blen_counter) {
value = host->fifo[host->fifo_start] >> 8;
sd_write_data(host->card, value);
host->blen_counter --;
}
host->fifo_start ++;
host->fifo_len --;
host->fifo_start &= 31;
}
if (host->blen_counter == 0) {
host->nblk_counter --;
host->blen_counter = host->blen;
if (host->nblk_counter == 0) {
host->nblk_counter = host->nblk;
host->transfer = 0;
host->status |= 0x0008;
break;
}
}
}
}
static void omap_mmc_update(void *opaque)
{
struct omap_mmc_s *s = opaque;
omap_mmc_transfer(s);
omap_mmc_fifolevel_update(s);
omap_mmc_interrupts_update(s);
}
void omap_mmc_reset(struct omap_mmc_s *host)
{
host->last_cmd = 0;
memset(host->rsp, 0, sizeof(host->rsp));
host->arg = 0;
host->dw = 0;
host->mode = 0;
host->enable = 0;
host->status = 0;
host->mask = 0;
host->cto = 0;
host->dto = 0;
host->fifo_len = 0;
host->blen = 0;
host->blen_counter = 0;
host->nblk = 0;
host->nblk_counter = 0;
host->tx_dma = 0;
host->rx_dma = 0;
host->ae_level = 0x00;
host->af_level = 0x1f;
host->transfer = 0;
host->cdet_wakeup = 0;
host->cdet_enable = 0;
qemu_set_irq(host->coverswitch, host->cdet_state);
host->clkdiv = 0;
}
static uint64_t omap_mmc_read(void *opaque, target_phys_addr_t offset,
unsigned size)
{
uint16_t i;
struct omap_mmc_s *s = (struct omap_mmc_s *) opaque;
if (size != 2) {
return omap_badwidth_read16(opaque, offset);
}
switch (offset) {
case 0x00: /* MMC_CMD */
return s->last_cmd;
case 0x04: /* MMC_ARGL */
return s->arg & 0x0000ffff;
case 0x08: /* MMC_ARGH */
return s->arg >> 16;
case 0x0c: /* MMC_CON */
return (s->dw << 15) | (s->mode << 12) | (s->enable << 11) |
(s->be << 10) | s->clkdiv;
case 0x10: /* MMC_STAT */
return s->status;
case 0x14: /* MMC_IE */
return s->mask;
case 0x18: /* MMC_CTO */
return s->cto;
case 0x1c: /* MMC_DTO */
return s->dto;
case 0x20: /* MMC_DATA */
/* TODO: support 8-bit access */
i = s->fifo[s->fifo_start];
if (s->fifo_len == 0) {
printf("MMC: FIFO underrun\n");
return i;
}
s->fifo_start ++;
s->fifo_len --;
s->fifo_start &= 31;
omap_mmc_transfer(s);
omap_mmc_fifolevel_update(s);
omap_mmc_interrupts_update(s);
return i;
case 0x24: /* MMC_BLEN */
return s->blen_counter;
case 0x28: /* MMC_NBLK */
return s->nblk_counter;
case 0x2c: /* MMC_BUF */
return (s->rx_dma << 15) | (s->af_level << 8) |
(s->tx_dma << 7) | s->ae_level;
case 0x30: /* MMC_SPI */
return 0x0000;
case 0x34: /* MMC_SDIO */
return (s->cdet_wakeup << 2) | (s->cdet_enable) | s->sdio;
case 0x38: /* MMC_SYST */
return 0x0000;
case 0x3c: /* MMC_REV */
return s->rev;
case 0x40: /* MMC_RSP0 */
case 0x44: /* MMC_RSP1 */
case 0x48: /* MMC_RSP2 */
case 0x4c: /* MMC_RSP3 */
case 0x50: /* MMC_RSP4 */
case 0x54: /* MMC_RSP5 */
case 0x58: /* MMC_RSP6 */
case 0x5c: /* MMC_RSP7 */
return s->rsp[(offset - 0x40) >> 2];
/* OMAP2-specific */
case 0x60: /* MMC_IOSR */
case 0x64: /* MMC_SYSC */
return 0;
case 0x68: /* MMC_SYSS */
return 1; /* RSTD */
}
OMAP_BAD_REG(offset);
return 0;
}
static void omap_mmc_write(void *opaque, target_phys_addr_t offset,
uint64_t value, unsigned size)
{
int i;
struct omap_mmc_s *s = (struct omap_mmc_s *) opaque;
if (size != 2) {
return omap_badwidth_write16(opaque, offset, value);
}
switch (offset) {
case 0x00: /* MMC_CMD */
if (!s->enable)
break;
s->last_cmd = value;
for (i = 0; i < 8; i ++)
s->rsp[i] = 0x0000;
omap_mmc_command(s, value & 63, (value >> 15) & 1,
(sd_cmd_type_t) ((value >> 12) & 3),
(value >> 11) & 1,
(sd_rsp_type_t) ((value >> 8) & 7),
(value >> 7) & 1);
omap_mmc_update(s);
break;
case 0x04: /* MMC_ARGL */
s->arg &= 0xffff0000;
s->arg |= 0x0000ffff & value;
break;
case 0x08: /* MMC_ARGH */
s->arg &= 0x0000ffff;
s->arg |= value << 16;
break;
case 0x0c: /* MMC_CON */
s->dw = (value >> 15) & 1;
s->mode = (value >> 12) & 3;
s->enable = (value >> 11) & 1;
s->be = (value >> 10) & 1;
s->clkdiv = (value >> 0) & (s->rev >= 2 ? 0x3ff : 0xff);
if (s->mode != 0)
printf("SD mode %i unimplemented!\n", s->mode);
if (s->be != 0)
printf("SD FIFO byte sex unimplemented!\n");
if (s->dw != 0 && s->lines < 4)
printf("4-bit SD bus enabled\n");
if (!s->enable)
omap_mmc_reset(s);
break;
case 0x10: /* MMC_STAT */
s->status &= ~value;
omap_mmc_interrupts_update(s);
break;
case 0x14: /* MMC_IE */
s->mask = value & 0x7fff;
omap_mmc_interrupts_update(s);
break;
case 0x18: /* MMC_CTO */
s->cto = value & 0xff;
if (s->cto > 0xfd && s->rev <= 1)
printf("MMC: CTO of 0xff and 0xfe cannot be used!\n");
break;
case 0x1c: /* MMC_DTO */
s->dto = value & 0xffff;
break;
case 0x20: /* MMC_DATA */
/* TODO: support 8-bit access */
if (s->fifo_len == 32)
break;
s->fifo[(s->fifo_start + s->fifo_len) & 31] = value;
s->fifo_len ++;
omap_mmc_transfer(s);
omap_mmc_fifolevel_update(s);
omap_mmc_interrupts_update(s);
break;
case 0x24: /* MMC_BLEN */
s->blen = (value & 0x07ff) + 1;
s->blen_counter = s->blen;
break;
case 0x28: /* MMC_NBLK */
s->nblk = (value & 0x07ff) + 1;
s->nblk_counter = s->nblk;
s->blen_counter = s->blen;
break;
case 0x2c: /* MMC_BUF */
s->rx_dma = (value >> 15) & 1;
s->af_level = (value >> 8) & 0x1f;
s->tx_dma = (value >> 7) & 1;
s->ae_level = value & 0x1f;
if (s->rx_dma)
s->status &= 0xfbff;
if (s->tx_dma)
s->status &= 0xf7ff;
omap_mmc_fifolevel_update(s);
omap_mmc_interrupts_update(s);
break;
/* SPI, SDIO and TEST modes unimplemented */
case 0x30: /* MMC_SPI (OMAP1 only) */
break;
case 0x34: /* MMC_SDIO */
s->sdio = value & (s->rev >= 2 ? 0xfbf3 : 0x2020);
s->cdet_wakeup = (value >> 9) & 1;
s->cdet_enable = (value >> 2) & 1;
break;
case 0x38: /* MMC_SYST */
break;
case 0x3c: /* MMC_REV */
case 0x40: /* MMC_RSP0 */
case 0x44: /* MMC_RSP1 */
case 0x48: /* MMC_RSP2 */
case 0x4c: /* MMC_RSP3 */
case 0x50: /* MMC_RSP4 */
case 0x54: /* MMC_RSP5 */
case 0x58: /* MMC_RSP6 */
case 0x5c: /* MMC_RSP7 */
OMAP_RO_REG(offset);
break;
/* OMAP2-specific */
case 0x60: /* MMC_IOSR */
if (value & 0xf)
printf("MMC: SDIO bits used!\n");
break;
case 0x64: /* MMC_SYSC */
if (value & (1 << 2)) /* SRTS */
omap_mmc_reset(s);
break;
case 0x68: /* MMC_SYSS */
OMAP_RO_REG(offset);
break;
default:
OMAP_BAD_REG(offset);
}
}
static const MemoryRegionOps omap_mmc_ops = {
.read = omap_mmc_read,
.write = omap_mmc_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void omap_mmc_cover_cb(void *opaque, int line, int level)
{
struct omap_mmc_s *host = (struct omap_mmc_s *) opaque;
if (!host->cdet_state && level) {
host->status |= 0x0002;
omap_mmc_interrupts_update(host);
if (host->cdet_wakeup) {
/* TODO: Assert wake-up */
}
}
if (host->cdet_state != level) {
qemu_set_irq(host->coverswitch, level);
host->cdet_state = level;
}
}
struct omap_mmc_s *omap_mmc_init(target_phys_addr_t base,
MemoryRegion *sysmem,
BlockDriverState *bd,
qemu_irq irq, qemu_irq dma[], omap_clk clk)
{
struct omap_mmc_s *s = (struct omap_mmc_s *)
g_malloc0(sizeof(struct omap_mmc_s));
s->irq = irq;
s->dma = dma;
s->clk = clk;
s->lines = 1; /* TODO: needs to be settable per-board */
s->rev = 1;
omap_mmc_reset(s);
memory_region_init_io(&s->iomem, &omap_mmc_ops, s, "omap.mmc", 0x800);
memory_region_add_subregion(sysmem, base, &s->iomem);
/* Instantiate the storage */
s->card = sd_init(bd, 0);
return s;
}
struct omap_mmc_s *omap2_mmc_init(struct omap_target_agent_s *ta,
BlockDriverState *bd, qemu_irq irq, qemu_irq dma[],
omap_clk fclk, omap_clk iclk)
{
struct omap_mmc_s *s = (struct omap_mmc_s *)
g_malloc0(sizeof(struct omap_mmc_s));
s->irq = irq;
s->dma = dma;
s->clk = fclk;
s->lines = 4;
s->rev = 2;
omap_mmc_reset(s);
memory_region_init_io(&s->iomem, &omap_mmc_ops, s, "omap.mmc",
omap_l4_region_size(ta, 0));
omap_l4_attach(ta, 0, &s->iomem);
/* Instantiate the storage */
s->card = sd_init(bd, 0);
s->cdet = qemu_allocate_irqs(omap_mmc_cover_cb, s, 1)[0];
sd_set_cb(s->card, NULL, s->cdet);
return s;
}
void omap_mmc_handlers(struct omap_mmc_s *s, qemu_irq ro, qemu_irq cover)
{
if (s->cdet) {
sd_set_cb(s->card, ro, s->cdet);
s->coverswitch = cover;
qemu_set_irq(cover, s->cdet_state);
} else
sd_set_cb(s->card, ro, cover);
}
void omap_mmc_enable(struct omap_mmc_s *s, int enable)
{
sd_enable(s->card, enable);
}
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