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qemu-irix/hw/sd/pxa2xx_mmci.c

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/*
* Intel XScale PXA255/270 MultiMediaCard/SD/SDIO Controller emulation.
*
* Copyright (c) 2006 Openedhand Ltd.
* Written by Andrzej Zaborowski <balrog@zabor.org>
*
* This code is licensed under the GPLv2.
*
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include "hw/hw.h"
#include "hw/arm/pxa.h"
#include "hw/sd/sd.h"
#include "hw/qdev.h"
struct PXA2xxMMCIState {
MemoryRegion iomem;
qemu_irq irq;
qemu_irq rx_dma;
qemu_irq tx_dma;
SDState *card;
uint32_t status;
uint32_t clkrt;
uint32_t spi;
uint32_t cmdat;
uint32_t resp_tout;
uint32_t read_tout;
int blklen;
int numblk;
uint32_t intmask;
uint32_t intreq;
int cmd;
uint32_t arg;
int active;
int bytesleft;
uint8_t tx_fifo[64];
int tx_start;
int tx_len;
uint8_t rx_fifo[32];
int rx_start;
int rx_len;
uint16_t resp_fifo[9];
int resp_len;
int cmdreq;
};
#define MMC_STRPCL 0x00 /* MMC Clock Start/Stop register */
#define MMC_STAT 0x04 /* MMC Status register */
#define MMC_CLKRT 0x08 /* MMC Clock Rate register */
#define MMC_SPI 0x0c /* MMC SPI Mode register */
#define MMC_CMDAT 0x10 /* MMC Command/Data register */
#define MMC_RESTO 0x14 /* MMC Response Time-Out register */
#define MMC_RDTO 0x18 /* MMC Read Time-Out register */
#define MMC_BLKLEN 0x1c /* MMC Block Length register */
#define MMC_NUMBLK 0x20 /* MMC Number of Blocks register */
#define MMC_PRTBUF 0x24 /* MMC Buffer Partly Full register */
#define MMC_I_MASK 0x28 /* MMC Interrupt Mask register */
#define MMC_I_REG 0x2c /* MMC Interrupt Request register */
#define MMC_CMD 0x30 /* MMC Command register */
#define MMC_ARGH 0x34 /* MMC Argument High register */
#define MMC_ARGL 0x38 /* MMC Argument Low register */
#define MMC_RES 0x3c /* MMC Response FIFO */
#define MMC_RXFIFO 0x40 /* MMC Receive FIFO */
#define MMC_TXFIFO 0x44 /* MMC Transmit FIFO */
#define MMC_RDWAIT 0x48 /* MMC RD_WAIT register */
#define MMC_BLKS_REM 0x4c /* MMC Blocks Remaining register */
/* Bitfield masks */
#define STRPCL_STOP_CLK (1 << 0)
#define STRPCL_STRT_CLK (1 << 1)
#define STAT_TOUT_RES (1 << 1)
#define STAT_CLK_EN (1 << 8)
#define STAT_DATA_DONE (1 << 11)
#define STAT_PRG_DONE (1 << 12)
#define STAT_END_CMDRES (1 << 13)
#define SPI_SPI_MODE (1 << 0)
#define CMDAT_RES_TYPE (3 << 0)
#define CMDAT_DATA_EN (1 << 2)
#define CMDAT_WR_RD (1 << 3)
#define CMDAT_DMA_EN (1 << 7)
#define CMDAT_STOP_TRAN (1 << 10)
#define INT_DATA_DONE (1 << 0)
#define INT_PRG_DONE (1 << 1)
#define INT_END_CMD (1 << 2)
#define INT_STOP_CMD (1 << 3)
#define INT_CLK_OFF (1 << 4)
#define INT_RXFIFO_REQ (1 << 5)
#define INT_TXFIFO_REQ (1 << 6)
#define INT_TINT (1 << 7)
#define INT_DAT_ERR (1 << 8)
#define INT_RES_ERR (1 << 9)
#define INT_RD_STALLED (1 << 10)
#define INT_SDIO_INT (1 << 11)
#define INT_SDIO_SACK (1 << 12)
#define PRTBUF_PRT_BUF (1 << 0)
/* Route internal interrupt lines to the global IC and DMA */
static void pxa2xx_mmci_int_update(PXA2xxMMCIState *s)
{
uint32_t mask = s->intmask;
if (s->cmdat & CMDAT_DMA_EN) {
mask |= INT_RXFIFO_REQ | INT_TXFIFO_REQ;
qemu_set_irq(s->rx_dma, !!(s->intreq & INT_RXFIFO_REQ));
qemu_set_irq(s->tx_dma, !!(s->intreq & INT_TXFIFO_REQ));
}
qemu_set_irq(s->irq, !!(s->intreq & ~mask));
}
static void pxa2xx_mmci_fifo_update(PXA2xxMMCIState *s)
{
if (!s->active)
return;
if (s->cmdat & CMDAT_WR_RD) {
while (s->bytesleft && s->tx_len) {
sd_write_data(s->card, s->tx_fifo[s->tx_start ++]);
s->tx_start &= 0x1f;
s->tx_len --;
s->bytesleft --;
}
if (s->bytesleft)
s->intreq |= INT_TXFIFO_REQ;
} else
while (s->bytesleft && s->rx_len < 32) {
s->rx_fifo[(s->rx_start + (s->rx_len ++)) & 0x1f] =
sd_read_data(s->card);
s->bytesleft --;
s->intreq |= INT_RXFIFO_REQ;
}
if (!s->bytesleft) {
s->active = 0;
s->intreq |= INT_DATA_DONE;
s->status |= STAT_DATA_DONE;
if (s->cmdat & CMDAT_WR_RD) {
s->intreq |= INT_PRG_DONE;
s->status |= STAT_PRG_DONE;
}
}
pxa2xx_mmci_int_update(s);
}
static void pxa2xx_mmci_wakequeues(PXA2xxMMCIState *s)
{
int rsplen, i;
SDRequest request;
uint8_t response[16];
s->active = 1;
s->rx_len = 0;
s->tx_len = 0;
s->cmdreq = 0;
request.cmd = s->cmd;
request.arg = s->arg;
request.crc = 0; /* FIXME */
rsplen = sd_do_command(s->card, &request, response);
s->intreq |= INT_END_CMD;
memset(s->resp_fifo, 0, sizeof(s->resp_fifo));
switch (s->cmdat & CMDAT_RES_TYPE) {
#define PXAMMCI_RESP(wd, value0, value1) \
s->resp_fifo[(wd) + 0] |= (value0); \
s->resp_fifo[(wd) + 1] |= (value1) << 8;
case 0: /* No response */
goto complete;
case 1: /* R1, R4, R5 or R6 */
if (rsplen < 4)
goto timeout;
goto complete;
case 2: /* R2 */
if (rsplen < 16)
goto timeout;
goto complete;
case 3: /* R3 */
if (rsplen < 4)
goto timeout;
goto complete;
complete:
for (i = 0; rsplen > 0; i ++, rsplen -= 2) {
PXAMMCI_RESP(i, response[i * 2], response[i * 2 + 1]);
}
s->status |= STAT_END_CMDRES;
if (!(s->cmdat & CMDAT_DATA_EN))
s->active = 0;
else
s->bytesleft = s->numblk * s->blklen;
s->resp_len = 0;
break;
timeout:
s->active = 0;
s->status |= STAT_TOUT_RES;
break;
}
pxa2xx_mmci_fifo_update(s);
}
static uint64_t pxa2xx_mmci_read(void *opaque, hwaddr offset, unsigned size)
{
PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
uint32_t ret;
switch (offset) {
case MMC_STRPCL:
return 0;
case MMC_STAT:
return s->status;
case MMC_CLKRT:
return s->clkrt;
case MMC_SPI:
return s->spi;
case MMC_CMDAT:
return s->cmdat;
case MMC_RESTO:
return s->resp_tout;
case MMC_RDTO:
return s->read_tout;
case MMC_BLKLEN:
return s->blklen;
case MMC_NUMBLK:
return s->numblk;
case MMC_PRTBUF:
return 0;
case MMC_I_MASK:
return s->intmask;
case MMC_I_REG:
return s->intreq;
case MMC_CMD:
return s->cmd | 0x40;
case MMC_ARGH:
return s->arg >> 16;
case MMC_ARGL:
return s->arg & 0xffff;
case MMC_RES:
if (s->resp_len < 9)
return s->resp_fifo[s->resp_len ++];
return 0;
case MMC_RXFIFO:
ret = 0;
while (size-- && s->rx_len) {
ret |= s->rx_fifo[s->rx_start++] << (size << 3);
s->rx_start &= 0x1f;
s->rx_len --;
}
s->intreq &= ~INT_RXFIFO_REQ;
pxa2xx_mmci_fifo_update(s);
return ret;
case MMC_RDWAIT:
return 0;
case MMC_BLKS_REM:
return s->numblk;
default:
hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
}
return 0;
}
static void pxa2xx_mmci_write(void *opaque,
hwaddr offset, uint64_t value, unsigned size)
{
PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
switch (offset) {
case MMC_STRPCL:
if (value & STRPCL_STRT_CLK) {
s->status |= STAT_CLK_EN;
s->intreq &= ~INT_CLK_OFF;
if (s->cmdreq && !(s->cmdat & CMDAT_STOP_TRAN)) {
s->status &= STAT_CLK_EN;
pxa2xx_mmci_wakequeues(s);
}
}
if (value & STRPCL_STOP_CLK) {
s->status &= ~STAT_CLK_EN;
s->intreq |= INT_CLK_OFF;
s->active = 0;
}
pxa2xx_mmci_int_update(s);
break;
case MMC_CLKRT:
s->clkrt = value & 7;
break;
case MMC_SPI:
s->spi = value & 0xf;
if (value & SPI_SPI_MODE)
printf("%s: attempted to use card in SPI mode\n", __FUNCTION__);
break;
case MMC_CMDAT:
s->cmdat = value & 0x3dff;
s->active = 0;
s->cmdreq = 1;
if (!(value & CMDAT_STOP_TRAN)) {
s->status &= STAT_CLK_EN;
if (s->status & STAT_CLK_EN)
pxa2xx_mmci_wakequeues(s);
}
pxa2xx_mmci_int_update(s);
break;
case MMC_RESTO:
s->resp_tout = value & 0x7f;
break;
case MMC_RDTO:
s->read_tout = value & 0xffff;
break;
case MMC_BLKLEN:
s->blklen = value & 0xfff;
break;
case MMC_NUMBLK:
s->numblk = value & 0xffff;
break;
case MMC_PRTBUF:
if (value & PRTBUF_PRT_BUF) {
s->tx_start ^= 32;
s->tx_len = 0;
}
pxa2xx_mmci_fifo_update(s);
break;
case MMC_I_MASK:
s->intmask = value & 0x1fff;
pxa2xx_mmci_int_update(s);
break;
case MMC_CMD:
s->cmd = value & 0x3f;
break;
case MMC_ARGH:
s->arg &= 0x0000ffff;
s->arg |= value << 16;
break;
case MMC_ARGL:
s->arg &= 0xffff0000;
s->arg |= value & 0x0000ffff;
break;
case MMC_TXFIFO:
while (size-- && s->tx_len < 0x20)
s->tx_fifo[(s->tx_start + (s->tx_len ++)) & 0x1f] =
(value >> (size << 3)) & 0xff;
s->intreq &= ~INT_TXFIFO_REQ;
pxa2xx_mmci_fifo_update(s);
break;
case MMC_RDWAIT:
case MMC_BLKS_REM:
break;
default:
hw_error("%s: Bad offset " REG_FMT "\n", __FUNCTION__, offset);
}
}
static const MemoryRegionOps pxa2xx_mmci_ops = {
.read = pxa2xx_mmci_read,
.write = pxa2xx_mmci_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static void pxa2xx_mmci_save(QEMUFile *f, void *opaque)
{
PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
int i;
qemu_put_be32s(f, &s->status);
qemu_put_be32s(f, &s->clkrt);
qemu_put_be32s(f, &s->spi);
qemu_put_be32s(f, &s->cmdat);
qemu_put_be32s(f, &s->resp_tout);
qemu_put_be32s(f, &s->read_tout);
qemu_put_be32(f, s->blklen);
qemu_put_be32(f, s->numblk);
qemu_put_be32s(f, &s->intmask);
qemu_put_be32s(f, &s->intreq);
qemu_put_be32(f, s->cmd);
qemu_put_be32s(f, &s->arg);
qemu_put_be32(f, s->cmdreq);
qemu_put_be32(f, s->active);
qemu_put_be32(f, s->bytesleft);
qemu_put_byte(f, s->tx_len);
for (i = 0; i < s->tx_len; i ++)
qemu_put_byte(f, s->tx_fifo[(s->tx_start + i) & 63]);
qemu_put_byte(f, s->rx_len);
for (i = 0; i < s->rx_len; i ++)
qemu_put_byte(f, s->rx_fifo[(s->rx_start + i) & 31]);
qemu_put_byte(f, s->resp_len);
for (i = s->resp_len; i < 9; i ++)
qemu_put_be16s(f, &s->resp_fifo[i]);
}
static int pxa2xx_mmci_load(QEMUFile *f, void *opaque, int version_id)
{
PXA2xxMMCIState *s = (PXA2xxMMCIState *) opaque;
int i;
qemu_get_be32s(f, &s->status);
qemu_get_be32s(f, &s->clkrt);
qemu_get_be32s(f, &s->spi);
qemu_get_be32s(f, &s->cmdat);
qemu_get_be32s(f, &s->resp_tout);
qemu_get_be32s(f, &s->read_tout);
s->blklen = qemu_get_be32(f);
s->numblk = qemu_get_be32(f);
qemu_get_be32s(f, &s->intmask);
qemu_get_be32s(f, &s->intreq);
s->cmd = qemu_get_be32(f);
qemu_get_be32s(f, &s->arg);
s->cmdreq = qemu_get_be32(f);
s->active = qemu_get_be32(f);
s->bytesleft = qemu_get_be32(f);
s->tx_len = qemu_get_byte(f);
s->tx_start = 0;
if (s->tx_len >= sizeof(s->tx_fifo) || s->tx_len < 0)
return -EINVAL;
for (i = 0; i < s->tx_len; i ++)
s->tx_fifo[i] = qemu_get_byte(f);
s->rx_len = qemu_get_byte(f);
s->rx_start = 0;
if (s->rx_len >= sizeof(s->rx_fifo) || s->rx_len < 0)
return -EINVAL;
for (i = 0; i < s->rx_len; i ++)
s->rx_fifo[i] = qemu_get_byte(f);
s->resp_len = qemu_get_byte(f);
if (s->resp_len > 9 || s->resp_len < 0)
return -EINVAL;
for (i = s->resp_len; i < 9; i ++)
qemu_get_be16s(f, &s->resp_fifo[i]);
return 0;
}
PXA2xxMMCIState *pxa2xx_mmci_init(MemoryRegion *sysmem,
hwaddr base,
BlockBackend *blk, qemu_irq irq,
qemu_irq rx_dma, qemu_irq tx_dma)
{
PXA2xxMMCIState *s;
s = (PXA2xxMMCIState *) g_malloc0(sizeof(PXA2xxMMCIState));
s->irq = irq;
s->rx_dma = rx_dma;
s->tx_dma = tx_dma;
memory_region_init_io(&s->iomem, NULL, &pxa2xx_mmci_ops, s,
"pxa2xx-mmci", 0x00100000);
memory_region_add_subregion(sysmem, base, &s->iomem);
/* Instantiate the actual storage */
s->card = sd_init(blk, false);
if (s->card == NULL) {
exit(1);
}
register_savevm(NULL, "pxa2xx_mmci", 0, 0,
pxa2xx_mmci_save, pxa2xx_mmci_load, s);
return s;
}
void pxa2xx_mmci_handlers(PXA2xxMMCIState *s, qemu_irq readonly,
qemu_irq coverswitch)
{
sd_set_cb(s->card, readonly, coverswitch);
}
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