-/*
+/*
* Arm PrimeCell PL181 MultiMedia Card Interface
*
* Copyright (c) 2007 CodeSourcery.
* Written by Paul Brook
*
- * This code is licenced under the GPL.
+ * This code is licensed under the GPL.
*/
-#include "vl.h"
+#include "blockdev.h"
+#include "sysbus.h"
#include "sd.h"
//#define DEBUG_PL181 1
#ifdef DEBUG_PL181
-#define DPRINTF(fmt, args...) \
-do { printf("pl181: " fmt , ##args); } while (0)
+#define DPRINTF(fmt, ...) \
+do { printf("pl181: " fmt , ## __VA_ARGS__); } while (0)
#else
-#define DPRINTF(fmt, args...) do {} while(0)
+#define DPRINTF(fmt, ...) do {} while(0)
#endif
#define PL181_FIFO_LEN 16
typedef struct {
+ SysBusDevice busdev;
+ MemoryRegion iomem;
SDState *card;
- uint32_t base;
uint32_t clock;
uint32_t power;
uint32_t cmdarg;
uint32_t datacnt;
uint32_t status;
uint32_t mask[2];
- uint32_t fifocnt;
- int fifo_pos;
- int fifo_len;
+ int32_t fifo_pos;
+ int32_t fifo_len;
+ /* The linux 2.6.21 driver is buggy, and misbehaves if new data arrives
+ while it is reading the FIFO. We hack around this be defering
+ subsequent transfers until after the driver polls the status word.
+ http://www.arm.linux.org.uk/developer/patches/viewpatch.php?id=4446/1
+ */
+ int32_t linux_hack;
uint32_t fifo[PL181_FIFO_LEN];
qemu_irq irq[2];
+ /* GPIO outputs for 'card is readonly' and 'card inserted' */
+ qemu_irq cardstatus[2];
} pl181_state;
+static const VMStateDescription vmstate_pl181 = {
+ .name = "pl181",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT32(clock, pl181_state),
+ VMSTATE_UINT32(power, pl181_state),
+ VMSTATE_UINT32(cmdarg, pl181_state),
+ VMSTATE_UINT32(cmd, pl181_state),
+ VMSTATE_UINT32(datatimer, pl181_state),
+ VMSTATE_UINT32(datalength, pl181_state),
+ VMSTATE_UINT32(respcmd, pl181_state),
+ VMSTATE_UINT32_ARRAY(response, pl181_state, 4),
+ VMSTATE_UINT32(datactrl, pl181_state),
+ VMSTATE_UINT32(datacnt, pl181_state),
+ VMSTATE_UINT32(status, pl181_state),
+ VMSTATE_UINT32_ARRAY(mask, pl181_state, 2),
+ VMSTATE_INT32(fifo_pos, pl181_state),
+ VMSTATE_INT32(fifo_len, pl181_state),
+ VMSTATE_INT32(linux_hack, pl181_state),
+ VMSTATE_UINT32_ARRAY(fifo, pl181_state, PL181_FIFO_LEN),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
#define PL181_CMD_INDEX 0x3f
#define PL181_CMD_RESPONSE (1 << 6)
#define PL181_CMD_LONGRESP (1 << 7)
static void pl181_send_command(pl181_state *s)
{
- struct sd_request_s request;
+ SDRequest request;
uint8_t response[16];
int rlen;
s->response[2] = RWORD(8);
s->response[3] = RWORD(12) & ~1;
}
- DPRINTF("Response recieved\n");
+ DPRINTF("Response received\n");
s->status |= PL181_STATUS_CMDRESPEND;
#undef RWORD
} else {
s->status |= PL181_STATUS_CMDTIMEOUT;
}
-/* Transfer data between teh card and the FIFO. This is complicated by
+/* Transfer data between the card and the FIFO. This is complicated by
the FIFO holding 32-bit words and the card taking data in single byte
chunks. FIFO bytes are transferred in little-endian order. */
-
+
static void pl181_fifo_run(pl181_state *s)
{
uint32_t bits;
- uint32_t value;
+ uint32_t value = 0;
int n;
- int limit;
int is_read;
is_read = (s->datactrl & PL181_DATA_DIRECTION) != 0;
- if (s->datacnt != 0 && (!is_read || sd_data_ready(s->card))) {
- limit = is_read ? PL181_FIFO_LEN : 0;
- n = 0;
- value = 0;
- while (s->datacnt && s->fifo_len != limit) {
- if (is_read) {
+ if (s->datacnt != 0 && (!is_read || sd_data_ready(s->card))
+ && !s->linux_hack) {
+ if (is_read) {
+ n = 0;
+ while (s->datacnt && s->fifo_len < PL181_FIFO_LEN) {
value |= (uint32_t)sd_read_data(s->card) << (n * 8);
+ s->datacnt--;
n++;
if (n == 4) {
pl181_fifo_push(s, value);
- value = 0;
n = 0;
+ value = 0;
}
- } else {
+ }
+ if (n != 0) {
+ pl181_fifo_push(s, value);
+ }
+ } else { /* write */
+ n = 0;
+ while (s->datacnt > 0 && (s->fifo_len > 0 || n > 0)) {
if (n == 0) {
value = pl181_fifo_pop(s);
n = 4;
}
+ n--;
+ s->datacnt--;
sd_write_data(s->card, value & 0xff);
value >>= 8;
- n--;
}
- s->datacnt--;
- }
- if (n && is_read) {
- pl181_fifo_push(s, value);
}
}
s->status &= ~(PL181_STATUS_RX_FIFO | PL181_STATUS_TX_FIFO);
s->status |= PL181_STATUS_DATABLOCKEND;
DPRINTF("Transfer Complete\n");
}
- if (s->datacnt == 0 && s->fifocnt == 0) {
+ if (s->datacnt == 0 && s->fifo_len == 0) {
s->datactrl &= ~PL181_DATA_ENABLE;
DPRINTF("Data engine idle\n");
} else {
}
}
-static uint32_t pl181_read(void *opaque, target_phys_addr_t offset)
+static uint64_t pl181_read(void *opaque, hwaddr offset,
+ unsigned size)
{
pl181_state *s = (pl181_state *)opaque;
+ uint32_t tmp;
- offset -= s->base;
if (offset >= 0xfe0 && offset < 0x1000) {
return pl181_id[(offset - 0xfe0) >> 2];
}
case 0x30: /* DataCnt */
return s->datacnt;
case 0x34: /* Status */
- return s->status;
+ tmp = s->status;
+ if (s->linux_hack) {
+ s->linux_hack = 0;
+ pl181_fifo_run(s);
+ pl181_update(s);
+ }
+ return tmp;
case 0x3c: /* Mask0 */
return s->mask[0];
case 0x40: /* Mask1 */
return s->mask[1];
case 0x48: /* FifoCnt */
- return s->fifocnt;
+ /* The documentation is somewhat vague about exactly what FifoCnt
+ does. On real hardware it appears to be when decrememnted
+ when a word is transferred between the FIFO and the serial
+ data engine. DataCnt is decremented after each byte is
+ transferred between the serial engine and the card.
+ We don't emulate this level of detail, so both can be the same. */
+ tmp = (s->datacnt + 3) >> 2;
+ if (s->linux_hack) {
+ s->linux_hack = 0;
+ pl181_fifo_run(s);
+ pl181_update(s);
+ }
+ return tmp;
case 0x80: case 0x84: case 0x88: case 0x8c: /* FifoData */
case 0x90: case 0x94: case 0x98: case 0x9c:
case 0xa0: case 0xa4: case 0xa8: case 0xac:
case 0xb0: case 0xb4: case 0xb8: case 0xbc:
- if (s->fifocnt == 0) {
- fprintf(stderr, "pl181: Unexpected FIFO read\n");
+ if (s->fifo_len == 0) {
+ qemu_log_mask(LOG_GUEST_ERROR, "pl181: Unexpected FIFO read\n");
return 0;
} else {
uint32_t value;
- s->fifocnt--;
value = pl181_fifo_pop(s);
+ s->linux_hack = 1;
pl181_fifo_run(s);
pl181_update(s);
return value;
}
default:
- cpu_abort (cpu_single_env, "pl181_read: Bad offset %x\n", offset);
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "pl181_read: Bad offset %x\n", (int)offset);
return 0;
}
}
-static void pl181_write(void *opaque, target_phys_addr_t offset,
- uint32_t value)
+static void pl181_write(void *opaque, hwaddr offset,
+ uint64_t value, unsigned size)
{
pl181_state *s = (pl181_state *)opaque;
- offset -= s->base;
switch (offset) {
case 0x00: /* Power */
s->power = value & 0xff;
s->cmd = value;
if (s->cmd & PL181_CMD_ENABLE) {
if (s->cmd & PL181_CMD_INTERRUPT) {
- fprintf(stderr, "pl181: Interrupt mode not implemented\n");
- abort();
+ qemu_log_mask(LOG_UNIMP,
+ "pl181: Interrupt mode not implemented\n");
} if (s->cmd & PL181_CMD_PENDING) {
- fprintf(stderr, "pl181: Pending commands not implemented\n");
- abort();
+ qemu_log_mask(LOG_UNIMP,
+ "pl181: Pending commands not implemented\n");
} else {
pl181_send_command(s);
pl181_fifo_run(s);
s->datactrl = value & 0xff;
if (value & PL181_DATA_ENABLE) {
s->datacnt = s->datalength;
- s->fifocnt = (s->datalength + 3) >> 2;
pl181_fifo_run(s);
}
break;
case 0x90: case 0x94: case 0x98: case 0x9c:
case 0xa0: case 0xa4: case 0xa8: case 0xac:
case 0xb0: case 0xb4: case 0xb8: case 0xbc:
- if (s->fifocnt == 0) {
- fprintf(stderr, "pl181: Unexpected FIFO write\n");
+ if (s->datacnt == 0) {
+ qemu_log_mask(LOG_GUEST_ERROR, "pl181: Unexpected FIFO write\n");
} else {
- s->fifocnt--;
pl181_fifo_push(s, value);
pl181_fifo_run(s);
}
break;
default:
- cpu_abort (cpu_single_env, "pl181_write: Bad offset %x\n", offset);
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "pl181_write: Bad offset %x\n", (int)offset);
}
pl181_update(s);
}
-static CPUReadMemoryFunc *pl181_readfn[] = {
- pl181_read,
- pl181_read,
- pl181_read
-};
-
-static CPUWriteMemoryFunc *pl181_writefn[] = {
- pl181_write,
- pl181_write,
- pl181_write
+static const MemoryRegionOps pl181_ops = {
+ .read = pl181_read,
+ .write = pl181_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
};
-static void pl181_reset(void *opaque)
+static void pl181_reset(DeviceState *d)
{
- pl181_state *s = (pl181_state *)opaque;
+ pl181_state *s = DO_UPCAST(pl181_state, busdev.qdev, d);
s->power = 0;
s->cmdarg = 0;
s->datactrl = 0;
s->datacnt = 0;
s->status = 0;
+ s->linux_hack = 0;
s->mask[0] = 0;
s->mask[1] = 0;
- s->fifocnt = 0;
+
+ /* We can assume our GPIO outputs have been wired up now */
+ sd_set_cb(s->card, s->cardstatus[0], s->cardstatus[1]);
+}
+
+static int pl181_init(SysBusDevice *dev)
+{
+ pl181_state *s = FROM_SYSBUS(pl181_state, dev);
+ DriveInfo *dinfo;
+
+ memory_region_init_io(&s->iomem, &pl181_ops, s, "pl181", 0x1000);
+ sysbus_init_mmio(dev, &s->iomem);
+ sysbus_init_irq(dev, &s->irq[0]);
+ sysbus_init_irq(dev, &s->irq[1]);
+ qdev_init_gpio_out(&s->busdev.qdev, s->cardstatus, 2);
+ dinfo = drive_get_next(IF_SD);
+ s->card = sd_init(dinfo ? dinfo->bdrv : NULL, 0);
+ return 0;
}
-void pl181_init(uint32_t base, BlockDriverState *bd,
- qemu_irq irq0, qemu_irq irq1)
+static void pl181_class_init(ObjectClass *klass, void *data)
{
- int iomemtype;
- pl181_state *s;
-
- s = (pl181_state *)qemu_mallocz(sizeof(pl181_state));
- iomemtype = cpu_register_io_memory(0, pl181_readfn,
- pl181_writefn, s);
- cpu_register_physical_memory(base, 0x00001000, iomemtype);
- s->base = base;
- s->card = sd_init(bd);
- s->irq[0] = irq0;
- s->irq[1] = irq1;
- qemu_register_reset(pl181_reset, s);
- pl181_reset(s);
- /* ??? Save/restore. */
+ SysBusDeviceClass *sdc = SYS_BUS_DEVICE_CLASS(klass);
+ DeviceClass *k = DEVICE_CLASS(klass);
+
+ sdc->init = pl181_init;
+ k->vmsd = &vmstate_pl181;
+ k->reset = pl181_reset;
+ k->no_user = 1;
}
+
+static TypeInfo pl181_info = {
+ .name = "pl181",
+ .parent = TYPE_SYS_BUS_DEVICE,
+ .instance_size = sizeof(pl181_state),
+ .class_init = pl181_class_init,
+};
+
+static void pl181_register_types(void)
+{
+ type_register_static(&pl181_info);
+}
+
+type_init(pl181_register_types)
projects / qemu.git / blobdiff