-/*
+/*
* Arm PrimeCell PL181 MultiMedia Card Interface
*
* Copyright (c) 2007 CodeSourcery.
* This code is licenced under the GPL.
*/
-#include "vl.h"
+#include "hw.h"
+#include "primecell.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 {
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;
+ /* 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
+ */
+ int linux_hack;
uint32_t fifo[PL181_FIFO_LEN];
qemu_irq irq[2];
} pl181_state;
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;
int is_read;
is_read = (s->datactrl & PL181_DATA_DIRECTION) != 0;
- if (s->datacnt != 0 && (!is_read || sd_data_ready(s->card))) {
+ if (s->datacnt != 0 && (!is_read || sd_data_ready(s->card))
+ && !s->linux_hack) {
limit = is_read ? PL181_FIFO_LEN : 0;
n = 0;
value = 0;
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)
{
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 transfered between the FIFO and the serial
+ data engine. DataCnt is decremented after each byte is
+ transfered 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) {
+ if (s->fifo_len == 0) {
fprintf(stderr, "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);
+ hw_error("pl181_read: Bad offset %x\n", (int)offset);
return 0;
}
}
{
pl181_state *s = (pl181_state *)opaque;
- offset -= s->base;
switch (offset) {
case 0x00: /* Power */
s->power = value & 0xff;
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) {
+ if (s->datacnt == 0) {
fprintf(stderr, "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);
+ hw_error("pl181_write: Bad offset %x\n", (int)offset);
}
pl181_update(s);
}
s->datactrl = 0;
s->datacnt = 0;
s->status = 0;
+ s->linux_hack = 0;
s->mask[0] = 0;
s->mask[1] = 0;
- s->fifocnt = 0;
}
void pl181_init(uint32_t base, BlockDriverState *bd,
s = (pl181_state *)qemu_mallocz(sizeof(pl181_state));
iomemtype = cpu_register_io_memory(0, pl181_readfn,
pl181_writefn, s);
- cpu_register_physical_memory(base, 0x00000fff, iomemtype);
- s->base = base;
- s->card = sd_init(bd);
+ cpu_register_physical_memory(base, 0x00001000, iomemtype);
+ s->card = sd_init(bd, 0);
s->irq[0] = irq0;
s->irq[1] = irq1;
qemu_register_reset(pl181_reset, s);
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