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qemu/hw/sd/bcm2835_sdhost.c

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/*
* Raspberry Pi (BCM2835) SD Host Controller
*
* Copyright (c) 2017 Antfield SAS
*
* Authors:
* Clement Deschamps <clement.deschamps@antfield.fr>
* Luc Michel <luc.michel@antfield.fr>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/log.h"
#include "sysemu/blockdev.h"
#include "hw/sd/bcm2835_sdhost.h"
#include "trace.h"
#define TYPE_BCM2835_SDHOST_BUS "bcm2835-sdhost-bus"
#define BCM2835_SDHOST_BUS(obj) \
OBJECT_CHECK(SDBus, (obj), TYPE_BCM2835_SDHOST_BUS)
#define SDCMD 0x00 /* Command to SD card - 16 R/W */
#define SDARG 0x04 /* Argument to SD card - 32 R/W */
#define SDTOUT 0x08 /* Start value for timeout counter - 32 R/W */
#define SDCDIV 0x0c /* Start value for clock divider - 11 R/W */
#define SDRSP0 0x10 /* SD card rsp (31:0) - 32 R */
#define SDRSP1 0x14 /* SD card rsp (63:32) - 32 R */
#define SDRSP2 0x18 /* SD card rsp (95:64) - 32 R */
#define SDRSP3 0x1c /* SD card rsp (127:96) - 32 R */
#define SDHSTS 0x20 /* SD host status - 11 R */
#define SDVDD 0x30 /* SD card power control - 1 R/W */
#define SDEDM 0x34 /* Emergency Debug Mode - 13 R/W */
#define SDHCFG 0x38 /* Host configuration - 2 R/W */
#define SDHBCT 0x3c /* Host byte count (debug) - 32 R/W */
#define SDDATA 0x40 /* Data to/from SD card - 32 R/W */
#define SDHBLC 0x50 /* Host block count (SDIO/SDHC) - 9 R/W */
#define SDCMD_NEW_FLAG 0x8000
#define SDCMD_FAIL_FLAG 0x4000
#define SDCMD_BUSYWAIT 0x800
#define SDCMD_NO_RESPONSE 0x400
#define SDCMD_LONG_RESPONSE 0x200
#define SDCMD_WRITE_CMD 0x80
#define SDCMD_READ_CMD 0x40
#define SDCMD_CMD_MASK 0x3f
#define SDCDIV_MAX_CDIV 0x7ff
#define SDHSTS_BUSY_IRPT 0x400
#define SDHSTS_BLOCK_IRPT 0x200
#define SDHSTS_SDIO_IRPT 0x100
#define SDHSTS_REW_TIME_OUT 0x80
#define SDHSTS_CMD_TIME_OUT 0x40
#define SDHSTS_CRC16_ERROR 0x20
#define SDHSTS_CRC7_ERROR 0x10
#define SDHSTS_FIFO_ERROR 0x08
/* Reserved */
/* Reserved */
#define SDHSTS_DATA_FLAG 0x01
#define SDHCFG_BUSY_IRPT_EN (1 << 10)
#define SDHCFG_BLOCK_IRPT_EN (1 << 8)
#define SDHCFG_SDIO_IRPT_EN (1 << 5)
#define SDHCFG_DATA_IRPT_EN (1 << 4)
#define SDHCFG_SLOW_CARD (1 << 3)
#define SDHCFG_WIDE_EXT_BUS (1 << 2)
#define SDHCFG_WIDE_INT_BUS (1 << 1)
#define SDHCFG_REL_CMD_LINE (1 << 0)
#define SDEDM_FORCE_DATA_MODE (1 << 19)
#define SDEDM_CLOCK_PULSE (1 << 20)
#define SDEDM_BYPASS (1 << 21)
#define SDEDM_WRITE_THRESHOLD_SHIFT 9
#define SDEDM_READ_THRESHOLD_SHIFT 14
#define SDEDM_THRESHOLD_MASK 0x1f
#define SDEDM_FSM_MASK 0xf
#define SDEDM_FSM_IDENTMODE 0x0
#define SDEDM_FSM_DATAMODE 0x1
#define SDEDM_FSM_READDATA 0x2
#define SDEDM_FSM_WRITEDATA 0x3
#define SDEDM_FSM_READWAIT 0x4
#define SDEDM_FSM_READCRC 0x5
#define SDEDM_FSM_WRITECRC 0x6
#define SDEDM_FSM_WRITEWAIT1 0x7
#define SDEDM_FSM_POWERDOWN 0x8
#define SDEDM_FSM_POWERUP 0x9
#define SDEDM_FSM_WRITESTART1 0xa
#define SDEDM_FSM_WRITESTART2 0xb
#define SDEDM_FSM_GENPULSES 0xc
#define SDEDM_FSM_WRITEWAIT2 0xd
#define SDEDM_FSM_STARTPOWDOWN 0xf
#define SDDATA_FIFO_WORDS 16
static void bcm2835_sdhost_update_irq(BCM2835SDHostState *s)
{
uint32_t irq = s->status &
(SDHSTS_BUSY_IRPT | SDHSTS_BLOCK_IRPT | SDHSTS_SDIO_IRPT);
trace_bcm2835_sdhost_update_irq(irq);
qemu_set_irq(s->irq, !!irq);
}
static void bcm2835_sdhost_send_command(BCM2835SDHostState *s)
{
SDRequest request;
uint8_t rsp[16];
int rlen;
request.cmd = s->cmd & SDCMD_CMD_MASK;
request.arg = s->cmdarg;
rlen = sdbus_do_command(&s->sdbus, &request, rsp);
if (rlen < 0) {
goto error;
}
if (!(s->cmd & SDCMD_NO_RESPONSE)) {
if (rlen == 0 || (rlen == 4 && (s->cmd & SDCMD_LONG_RESPONSE))) {
goto error;
}
if (rlen != 4 && rlen != 16) {
goto error;
}
if (rlen == 4) {
s->rsp[0] = ldl_be_p(&rsp[0]);
s->rsp[1] = s->rsp[2] = s->rsp[3] = 0;
} else {
s->rsp[0] = ldl_be_p(&rsp[12]);
s->rsp[1] = ldl_be_p(&rsp[8]);
s->rsp[2] = ldl_be_p(&rsp[4]);
s->rsp[3] = ldl_be_p(&rsp[0]);
}
}
/* We never really delay commands, so if this was a 'busywait' command
* then we've completed it now and can raise the interrupt.
*/
if ((s->cmd & SDCMD_BUSYWAIT) && (s->config & SDHCFG_BUSY_IRPT_EN)) {
s->status |= SDHSTS_BUSY_IRPT;
}
return;
error:
s->cmd |= SDCMD_FAIL_FLAG;
s->status |= SDHSTS_CMD_TIME_OUT;
}
static void bcm2835_sdhost_fifo_push(BCM2835SDHostState *s, uint32_t value)
{
int n;
if (s->fifo_len == BCM2835_SDHOST_FIFO_LEN) {
/* FIFO overflow */
return;
}
n = (s->fifo_pos + s->fifo_len) & (BCM2835_SDHOST_FIFO_LEN - 1);
s->fifo_len++;
s->fifo[n] = value;
}
static uint32_t bcm2835_sdhost_fifo_pop(BCM2835SDHostState *s)
{
uint32_t value;
if (s->fifo_len == 0) {
/* FIFO underflow */
return 0;
}
value = s->fifo[s->fifo_pos];
s->fifo_len--;
s->fifo_pos = (s->fifo_pos + 1) & (BCM2835_SDHOST_FIFO_LEN - 1);
return value;
}
static void bcm2835_sdhost_fifo_run(BCM2835SDHostState *s)
{
uint32_t value = 0;
int n;
int is_read;
int is_write;
is_read = (s->cmd & SDCMD_READ_CMD) != 0;
is_write = (s->cmd & SDCMD_WRITE_CMD) != 0;
if (s->datacnt != 0 && (is_write || sdbus_data_ready(&s->sdbus))) {
if (is_read) {
n = 0;
while (s->datacnt && s->fifo_len < BCM2835_SDHOST_FIFO_LEN) {
value |= (uint32_t)sdbus_read_data(&s->sdbus) << (n * 8);
s->datacnt--;
n++;
if (n == 4) {
bcm2835_sdhost_fifo_push(s, value);
s->status |= SDHSTS_DATA_FLAG;
if (s->config & SDHCFG_DATA_IRPT_EN) {
s->status |= SDHSTS_SDIO_IRPT;
}
n = 0;
value = 0;
}
}
if (n != 0) {
bcm2835_sdhost_fifo_push(s, value);
s->status |= SDHSTS_DATA_FLAG;
if (s->config & SDHCFG_DATA_IRPT_EN) {
s->status |= SDHSTS_SDIO_IRPT;
}
}
} else if (is_write) { /* write */
n = 0;
while (s->datacnt > 0 && (s->fifo_len > 0 || n > 0)) {
if (n == 0) {
value = bcm2835_sdhost_fifo_pop(s);
s->status |= SDHSTS_DATA_FLAG;
if (s->config & SDHCFG_DATA_IRPT_EN) {
s->status |= SDHSTS_SDIO_IRPT;
}
n = 4;
}
n--;
s->datacnt--;
sdbus_write_data(&s->sdbus, value & 0xff);
value >>= 8;
}
}
if (s->datacnt == 0) {
s->edm &= ~SDEDM_FSM_MASK;
s->edm |= SDEDM_FSM_DATAMODE;
trace_bcm2835_sdhost_edm_change("datacnt 0", s->edm);
}
if (is_write) {
/* set block interrupt at end of each block transfer */
if (s->hbct && s->datacnt % s->hbct == 0 &&
(s->config & SDHCFG_BLOCK_IRPT_EN)) {
s->status |= SDHSTS_BLOCK_IRPT;
}
/* set data interrupt after each transfer */
s->status |= SDHSTS_DATA_FLAG;
if (s->config & SDHCFG_DATA_IRPT_EN) {
s->status |= SDHSTS_SDIO_IRPT;
}
}
}
bcm2835_sdhost_update_irq(s);
s->edm &= ~(0x1f << 4);
s->edm |= ((s->fifo_len & 0x1f) << 4);
trace_bcm2835_sdhost_edm_change("fifo run", s->edm);
}
static uint64_t bcm2835_sdhost_read(void *opaque, hwaddr offset,
unsigned size)
{
BCM2835SDHostState *s = (BCM2835SDHostState *)opaque;
uint32_t res = 0;
switch (offset) {
case SDCMD:
res = s->cmd;
break;
case SDHSTS:
res = s->status;
break;
case SDRSP0:
res = s->rsp[0];
break;
case SDRSP1:
res = s->rsp[1];
break;
case SDRSP2:
res = s->rsp[2];
break;
case SDRSP3:
res = s->rsp[3];
break;
case SDEDM:
res = s->edm;
break;
case SDVDD:
res = s->vdd;
break;
case SDDATA:
res = bcm2835_sdhost_fifo_pop(s);
bcm2835_sdhost_fifo_run(s);
break;
case SDHBCT:
res = s->hbct;
break;
case SDHBLC:
res = s->hblc;
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
__func__, offset);
res = 0;
break;
}
trace_bcm2835_sdhost_read(offset, res, size);
return res;
}
static void bcm2835_sdhost_write(void *opaque, hwaddr offset,
uint64_t value, unsigned size)
{
BCM2835SDHostState *s = (BCM2835SDHostState *)opaque;
trace_bcm2835_sdhost_write(offset, value, size);
switch (offset) {
case SDCMD:
s->cmd = value;
if (value & SDCMD_NEW_FLAG) {
bcm2835_sdhost_send_command(s);
bcm2835_sdhost_fifo_run(s);
s->cmd &= ~SDCMD_NEW_FLAG;
}
break;
case SDTOUT:
break;
case SDCDIV:
break;
case SDHSTS:
s->status &= ~value;
bcm2835_sdhost_update_irq(s);
break;
case SDARG:
s->cmdarg = value;
break;
case SDEDM:
if ((value & 0xf) == 0xf) {
/* power down */
value &= ~0xf;
}
s->edm = value;
trace_bcm2835_sdhost_edm_change("guest register write", s->edm);
break;
case SDHCFG:
s->config = value;
bcm2835_sdhost_fifo_run(s);
break;
case SDVDD:
s->vdd = value;
break;
case SDDATA:
bcm2835_sdhost_fifo_push(s, value);
bcm2835_sdhost_fifo_run(s);
break;
case SDHBCT:
s->hbct = value;
break;
case SDHBLC:
s->hblc = value;
s->datacnt = s->hblc * s->hbct;
bcm2835_sdhost_fifo_run(s);
break;
default:
qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset %"HWADDR_PRIx"\n",
__func__, offset);
break;
}
}
static const MemoryRegionOps bcm2835_sdhost_ops = {
.read = bcm2835_sdhost_read,
.write = bcm2835_sdhost_write,
.endianness = DEVICE_NATIVE_ENDIAN,
};
static const VMStateDescription vmstate_bcm2835_sdhost = {
.name = TYPE_BCM2835_SDHOST,
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(cmd, BCM2835SDHostState),
VMSTATE_UINT32(cmdarg, BCM2835SDHostState),
VMSTATE_UINT32(status, BCM2835SDHostState),
VMSTATE_UINT32_ARRAY(rsp, BCM2835SDHostState, 4),
VMSTATE_UINT32(config, BCM2835SDHostState),
VMSTATE_UINT32(edm, BCM2835SDHostState),
VMSTATE_UINT32(vdd, BCM2835SDHostState),
VMSTATE_UINT32(hbct, BCM2835SDHostState),
VMSTATE_UINT32(hblc, BCM2835SDHostState),
VMSTATE_INT32(fifo_pos, BCM2835SDHostState),
VMSTATE_INT32(fifo_len, BCM2835SDHostState),
VMSTATE_UINT32_ARRAY(fifo, BCM2835SDHostState, BCM2835_SDHOST_FIFO_LEN),
VMSTATE_UINT32(datacnt, BCM2835SDHostState),
VMSTATE_END_OF_LIST()
}
};
static void bcm2835_sdhost_init(Object *obj)
{
BCM2835SDHostState *s = BCM2835_SDHOST(obj);
qbus_create_inplace(&s->sdbus, sizeof(s->sdbus),
TYPE_BCM2835_SDHOST_BUS, DEVICE(s), "sd-bus");
memory_region_init_io(&s->iomem, obj, &bcm2835_sdhost_ops, s,
TYPE_BCM2835_SDHOST, 0x1000);
sysbus_init_mmio(SYS_BUS_DEVICE(s), &s->iomem);
sysbus_init_irq(SYS_BUS_DEVICE(s), &s->irq);
}
static void bcm2835_sdhost_reset(DeviceState *dev)
{
BCM2835SDHostState *s = BCM2835_SDHOST(dev);
s->cmd = 0;
s->cmdarg = 0;
s->edm = 0x0000c60f;
trace_bcm2835_sdhost_edm_change("device reset", s->edm);
s->config = 0;
s->hbct = 0;
s->hblc = 0;
s->datacnt = 0;
s->fifo_pos = 0;
s->fifo_len = 0;
}
static void bcm2835_sdhost_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->reset = bcm2835_sdhost_reset;
dc->vmsd = &vmstate_bcm2835_sdhost;
}
static TypeInfo bcm2835_sdhost_info = {
.name = TYPE_BCM2835_SDHOST,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(BCM2835SDHostState),
.class_init = bcm2835_sdhost_class_init,
.instance_init = bcm2835_sdhost_init,
};
static const TypeInfo bcm2835_sdhost_bus_info = {
.name = TYPE_BCM2835_SDHOST_BUS,
.parent = TYPE_SD_BUS,
.instance_size = sizeof(SDBus),
};
static void bcm2835_sdhost_register_types(void)
{
type_register_static(&bcm2835_sdhost_info);
type_register_static(&bcm2835_sdhost_bus_info);
}
type_init(bcm2835_sdhost_register_types)
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