aboutsummaryrefslogtreecommitdiff
path: root/hw/sd/pl181.c
diff options
context:
space:
mode:
Diffstat (limited to 'hw/sd/pl181.c')
-rw-r--r--hw/sd/pl181.c515
1 files changed, 515 insertions, 0 deletions
diff --git a/hw/sd/pl181.c b/hw/sd/pl181.c
new file mode 100644
index 0000000000..2527296776
--- /dev/null
+++ b/hw/sd/pl181.c
@@ -0,0 +1,515 @@
+/*
+ * Arm PrimeCell PL181 MultiMedia Card Interface
+ *
+ * Copyright (c) 2007 CodeSourcery.
+ * Written by Paul Brook
+ *
+ * This code is licensed under the GPL.
+ */
+
+#include "sysemu/blockdev.h"
+#include "hw/sysbus.h"
+#include "hw/sd.h"
+
+//#define DEBUG_PL181 1
+
+#ifdef DEBUG_PL181
+#define DPRINTF(fmt, ...) \
+do { printf("pl181: " fmt , ## __VA_ARGS__); } while (0)
+#else
+#define DPRINTF(fmt, ...) do {} while(0)
+#endif
+
+#define PL181_FIFO_LEN 16
+
+typedef struct {
+ SysBusDevice busdev;
+ MemoryRegion iomem;
+ SDState *card;
+ uint32_t clock;
+ uint32_t power;
+ uint32_t cmdarg;
+ uint32_t cmd;
+ uint32_t datatimer;
+ uint32_t datalength;
+ uint32_t respcmd;
+ uint32_t response[4];
+ uint32_t datactrl;
+ uint32_t datacnt;
+ uint32_t status;
+ uint32_t mask[2];
+ 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)
+#define PL181_CMD_INTERRUPT (1 << 8)
+#define PL181_CMD_PENDING (1 << 9)
+#define PL181_CMD_ENABLE (1 << 10)
+
+#define PL181_DATA_ENABLE (1 << 0)
+#define PL181_DATA_DIRECTION (1 << 1)
+#define PL181_DATA_MODE (1 << 2)
+#define PL181_DATA_DMAENABLE (1 << 3)
+
+#define PL181_STATUS_CMDCRCFAIL (1 << 0)
+#define PL181_STATUS_DATACRCFAIL (1 << 1)
+#define PL181_STATUS_CMDTIMEOUT (1 << 2)
+#define PL181_STATUS_DATATIMEOUT (1 << 3)
+#define PL181_STATUS_TXUNDERRUN (1 << 4)
+#define PL181_STATUS_RXOVERRUN (1 << 5)
+#define PL181_STATUS_CMDRESPEND (1 << 6)
+#define PL181_STATUS_CMDSENT (1 << 7)
+#define PL181_STATUS_DATAEND (1 << 8)
+#define PL181_STATUS_DATABLOCKEND (1 << 10)
+#define PL181_STATUS_CMDACTIVE (1 << 11)
+#define PL181_STATUS_TXACTIVE (1 << 12)
+#define PL181_STATUS_RXACTIVE (1 << 13)
+#define PL181_STATUS_TXFIFOHALFEMPTY (1 << 14)
+#define PL181_STATUS_RXFIFOHALFFULL (1 << 15)
+#define PL181_STATUS_TXFIFOFULL (1 << 16)
+#define PL181_STATUS_RXFIFOFULL (1 << 17)
+#define PL181_STATUS_TXFIFOEMPTY (1 << 18)
+#define PL181_STATUS_RXFIFOEMPTY (1 << 19)
+#define PL181_STATUS_TXDATAAVLBL (1 << 20)
+#define PL181_STATUS_RXDATAAVLBL (1 << 21)
+
+#define PL181_STATUS_TX_FIFO (PL181_STATUS_TXACTIVE \
+ |PL181_STATUS_TXFIFOHALFEMPTY \
+ |PL181_STATUS_TXFIFOFULL \
+ |PL181_STATUS_TXFIFOEMPTY \
+ |PL181_STATUS_TXDATAAVLBL)
+#define PL181_STATUS_RX_FIFO (PL181_STATUS_RXACTIVE \
+ |PL181_STATUS_RXFIFOHALFFULL \
+ |PL181_STATUS_RXFIFOFULL \
+ |PL181_STATUS_RXFIFOEMPTY \
+ |PL181_STATUS_RXDATAAVLBL)
+
+static const unsigned char pl181_id[] =
+{ 0x81, 0x11, 0x04, 0x00, 0x0d, 0xf0, 0x05, 0xb1 };
+
+static void pl181_update(pl181_state *s)
+{
+ int i;
+ for (i = 0; i < 2; i++) {
+ qemu_set_irq(s->irq[i], (s->status & s->mask[i]) != 0);
+ }
+}
+
+static void pl181_fifo_push(pl181_state *s, uint32_t value)
+{
+ int n;
+
+ if (s->fifo_len == PL181_FIFO_LEN) {
+ fprintf(stderr, "pl181: FIFO overflow\n");
+ return;
+ }
+ n = (s->fifo_pos + s->fifo_len) & (PL181_FIFO_LEN - 1);
+ s->fifo_len++;
+ s->fifo[n] = value;
+ DPRINTF("FIFO push %08x\n", (int)value);
+}
+
+static uint32_t pl181_fifo_pop(pl181_state *s)
+{
+ uint32_t value;
+
+ if (s->fifo_len == 0) {
+ fprintf(stderr, "pl181: FIFO underflow\n");
+ return 0;
+ }
+ value = s->fifo[s->fifo_pos];
+ s->fifo_len--;
+ s->fifo_pos = (s->fifo_pos + 1) & (PL181_FIFO_LEN - 1);
+ DPRINTF("FIFO pop %08x\n", (int)value);
+ return value;
+}
+
+static void pl181_send_command(pl181_state *s)
+{
+ SDRequest request;
+ uint8_t response[16];
+ int rlen;
+
+ request.cmd = s->cmd & PL181_CMD_INDEX;
+ request.arg = s->cmdarg;
+ DPRINTF("Command %d %08x\n", request.cmd, request.arg);
+ rlen = sd_do_command(s->card, &request, response);
+ if (rlen < 0)
+ goto error;
+ if (s->cmd & PL181_CMD_RESPONSE) {
+#define RWORD(n) ((response[n] << 24) | (response[n + 1] << 16) \
+ | (response[n + 2] << 8) | response[n + 3])
+ if (rlen == 0 || (rlen == 4 && (s->cmd & PL181_CMD_LONGRESP)))
+ goto error;
+ if (rlen != 4 && rlen != 16)
+ goto error;
+ s->response[0] = RWORD(0);
+ if (rlen == 4) {
+ s->response[1] = s->response[2] = s->response[3] = 0;
+ } else {
+ s->response[1] = RWORD(4);
+ s->response[2] = RWORD(8);
+ s->response[3] = RWORD(12) & ~1;
+ }
+ DPRINTF("Response received\n");
+ s->status |= PL181_STATUS_CMDRESPEND;
+#undef RWORD
+ } else {
+ DPRINTF("Command sent\n");
+ s->status |= PL181_STATUS_CMDSENT;
+ }
+ return;
+
+error:
+ DPRINTF("Timeout\n");
+ s->status |= PL181_STATUS_CMDTIMEOUT;
+}
+
+/* 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 = 0;
+ int n;
+ int is_read;
+
+ is_read = (s->datactrl & PL181_DATA_DIRECTION) != 0;
+ 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);
+ n = 0;
+ value = 0;
+ }
+ }
+ 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;
+ }
+ }
+ }
+ s->status &= ~(PL181_STATUS_RX_FIFO | PL181_STATUS_TX_FIFO);
+ if (s->datacnt == 0) {
+ s->status |= PL181_STATUS_DATAEND;
+ /* HACK: */
+ s->status |= PL181_STATUS_DATABLOCKEND;
+ DPRINTF("Transfer Complete\n");
+ }
+ if (s->datacnt == 0 && s->fifo_len == 0) {
+ s->datactrl &= ~PL181_DATA_ENABLE;
+ DPRINTF("Data engine idle\n");
+ } else {
+ /* Update FIFO bits. */
+ bits = PL181_STATUS_TXACTIVE | PL181_STATUS_RXACTIVE;
+ if (s->fifo_len == 0) {
+ bits |= PL181_STATUS_TXFIFOEMPTY;
+ bits |= PL181_STATUS_RXFIFOEMPTY;
+ } else {
+ bits |= PL181_STATUS_TXDATAAVLBL;
+ bits |= PL181_STATUS_RXDATAAVLBL;
+ }
+ if (s->fifo_len == 16) {
+ bits |= PL181_STATUS_TXFIFOFULL;
+ bits |= PL181_STATUS_RXFIFOFULL;
+ }
+ if (s->fifo_len <= 8) {
+ bits |= PL181_STATUS_TXFIFOHALFEMPTY;
+ }
+ if (s->fifo_len >= 8) {
+ bits |= PL181_STATUS_RXFIFOHALFFULL;
+ }
+ if (s->datactrl & PL181_DATA_DIRECTION) {
+ bits &= PL181_STATUS_RX_FIFO;
+ } else {
+ bits &= PL181_STATUS_TX_FIFO;
+ }
+ s->status |= bits;
+ }
+}
+
+static uint64_t pl181_read(void *opaque, hwaddr offset,
+ unsigned size)
+{
+ pl181_state *s = (pl181_state *)opaque;
+ uint32_t tmp;
+
+ if (offset >= 0xfe0 && offset < 0x1000) {
+ return pl181_id[(offset - 0xfe0) >> 2];
+ }
+ switch (offset) {
+ case 0x00: /* Power */
+ return s->power;
+ case 0x04: /* Clock */
+ return s->clock;
+ case 0x08: /* Argument */
+ return s->cmdarg;
+ case 0x0c: /* Command */
+ return s->cmd;
+ case 0x10: /* RespCmd */
+ return s->respcmd;
+ case 0x14: /* Response0 */
+ return s->response[0];
+ case 0x18: /* Response1 */
+ return s->response[1];
+ case 0x1c: /* Response2 */
+ return s->response[2];
+ case 0x20: /* Response3 */
+ return s->response[3];
+ case 0x24: /* DataTimer */
+ return s->datatimer;
+ case 0x28: /* DataLength */
+ return s->datalength;
+ case 0x2c: /* DataCtrl */
+ return s->datactrl;
+ case 0x30: /* DataCnt */
+ return s->datacnt;
+ case 0x34: /* 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 */
+ /* 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->fifo_len == 0) {
+ qemu_log_mask(LOG_GUEST_ERROR, "pl181: Unexpected FIFO read\n");
+ return 0;
+ } else {
+ uint32_t value;
+ value = pl181_fifo_pop(s);
+ s->linux_hack = 1;
+ pl181_fifo_run(s);
+ pl181_update(s);
+ return value;
+ }
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "pl181_read: Bad offset %x\n", (int)offset);
+ return 0;
+ }
+}
+
+static void pl181_write(void *opaque, hwaddr offset,
+ uint64_t value, unsigned size)
+{
+ pl181_state *s = (pl181_state *)opaque;
+
+ switch (offset) {
+ case 0x00: /* Power */
+ s->power = value & 0xff;
+ break;
+ case 0x04: /* Clock */
+ s->clock = value & 0xff;
+ break;
+ case 0x08: /* Argument */
+ s->cmdarg = value;
+ break;
+ case 0x0c: /* Command */
+ s->cmd = value;
+ if (s->cmd & PL181_CMD_ENABLE) {
+ if (s->cmd & PL181_CMD_INTERRUPT) {
+ qemu_log_mask(LOG_UNIMP,
+ "pl181: Interrupt mode not implemented\n");
+ } if (s->cmd & PL181_CMD_PENDING) {
+ qemu_log_mask(LOG_UNIMP,
+ "pl181: Pending commands not implemented\n");
+ } else {
+ pl181_send_command(s);
+ pl181_fifo_run(s);
+ }
+ /* The command has completed one way or the other. */
+ s->cmd &= ~PL181_CMD_ENABLE;
+ }
+ break;
+ case 0x24: /* DataTimer */
+ s->datatimer = value;
+ break;
+ case 0x28: /* DataLength */
+ s->datalength = value & 0xffff;
+ break;
+ case 0x2c: /* DataCtrl */
+ s->datactrl = value & 0xff;
+ if (value & PL181_DATA_ENABLE) {
+ s->datacnt = s->datalength;
+ pl181_fifo_run(s);
+ }
+ break;
+ case 0x38: /* Clear */
+ s->status &= ~(value & 0x7ff);
+ break;
+ case 0x3c: /* Mask0 */
+ s->mask[0] = value;
+ break;
+ case 0x40: /* Mask1 */
+ s->mask[1] = value;
+ break;
+ 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->datacnt == 0) {
+ qemu_log_mask(LOG_GUEST_ERROR, "pl181: Unexpected FIFO write\n");
+ } else {
+ pl181_fifo_push(s, value);
+ pl181_fifo_run(s);
+ }
+ break;
+ default:
+ qemu_log_mask(LOG_GUEST_ERROR,
+ "pl181_write: Bad offset %x\n", (int)offset);
+ }
+ pl181_update(s);
+}
+
+static const MemoryRegionOps pl181_ops = {
+ .read = pl181_read,
+ .write = pl181_write,
+ .endianness = DEVICE_NATIVE_ENDIAN,
+};
+
+static void pl181_reset(DeviceState *d)
+{
+ pl181_state *s = DO_UPCAST(pl181_state, busdev.qdev, d);
+
+ s->power = 0;
+ s->cmdarg = 0;
+ s->cmd = 0;
+ s->datatimer = 0;
+ s->datalength = 0;
+ s->respcmd = 0;
+ s->response[0] = 0;
+ s->response[1] = 0;
+ s->response[2] = 0;
+ s->response[3] = 0;
+ s->datatimer = 0;
+ s->datalength = 0;
+ s->datactrl = 0;
+ s->datacnt = 0;
+ s->status = 0;
+ s->linux_hack = 0;
+ s->mask[0] = 0;
+ s->mask[1] = 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;
+}
+
+static void pl181_class_init(ObjectClass *klass, void *data)
+{
+ 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 const 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)
generated by cgit v1.2.3 (git 2.26.2) at 2024-12-14 16:14:39 +0000