diff options
Diffstat (limited to 'src/hw/sd/pl181.c')
| -rw-r--r-- | src/hw/sd/pl181.c | 527 |
1 files changed, 527 insertions, 0 deletions
diff --git a/src/hw/sd/pl181.c b/src/hw/sd/pl181.c new file mode 100644 index 0000000..326c53a --- /dev/null +++ b/src/hw/sd/pl181.c @@ -0,0 +1,527 @@ +/* + * Arm PrimeCell PL181 MultiMedia Card Interface + * + * Copyright (c) 2007 CodeSourcery. + * Written by Paul Brook + * + * This code is licensed under the GPL. + */ + +#include "sysemu/block-backend.h" +#include "sysemu/blockdev.h" +#include "hw/sysbus.h" +#include "hw/sd/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 + +#define TYPE_PL181 "pl181" +#define PL181(obj) OBJECT_CHECK(PL181State, (obj), TYPE_PL181) + +typedef struct PL181State { + SysBusDevice parent_obj; + + 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 by deferring + 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]; +} PL181State; + +static const VMStateDescription vmstate_pl181 = { + .name = "pl181", + .version_id = 1, + .minimum_version_id = 1, + .fields = (VMStateField[]) { + VMSTATE_UINT32(clock, PL181State), + VMSTATE_UINT32(power, PL181State), + VMSTATE_UINT32(cmdarg, PL181State), + VMSTATE_UINT32(cmd, PL181State), + VMSTATE_UINT32(datatimer, PL181State), + VMSTATE_UINT32(datalength, PL181State), + VMSTATE_UINT32(respcmd, PL181State), + VMSTATE_UINT32_ARRAY(response, PL181State, 4), + VMSTATE_UINT32(datactrl, PL181State), + VMSTATE_UINT32(datacnt, PL181State), + VMSTATE_UINT32(status, PL181State), + VMSTATE_UINT32_ARRAY(mask, PL181State, 2), + VMSTATE_INT32(fifo_pos, PL181State), + VMSTATE_INT32(fifo_len, PL181State), + VMSTATE_INT32(linux_hack, PL181State), + VMSTATE_UINT32_ARRAY(fifo, PL181State, 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(PL181State *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(PL181State *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(PL181State *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(PL181State *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) (((uint32_t)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(PL181State *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) +{ + PL181State *s = (PL181State *)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) +{ + PL181State *s = (PL181State *)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) +{ + PL181State *s = PL181(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 *sbd) +{ + DeviceState *dev = DEVICE(sbd); + PL181State *s = PL181(dev); + DriveInfo *dinfo; + + memory_region_init_io(&s->iomem, OBJECT(s), &pl181_ops, s, "pl181", 0x1000); + sysbus_init_mmio(sbd, &s->iomem); + sysbus_init_irq(sbd, &s->irq[0]); + sysbus_init_irq(sbd, &s->irq[1]); + qdev_init_gpio_out(dev, s->cardstatus, 2); + /* FIXME use a qdev drive property instead of drive_get_next() */ + dinfo = drive_get_next(IF_SD); + s->card = sd_init(dinfo ? blk_by_legacy_dinfo(dinfo) : NULL, false); + if (s->card == NULL) { + return -1; + } + + 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; + /* Reason: init() method uses drive_get_next() */ + k->cannot_instantiate_with_device_add_yet = true; +} + +static const TypeInfo pl181_info = { + .name = TYPE_PL181, + .parent = TYPE_SYS_BUS_DEVICE, + .instance_size = sizeof(PL181State), + .class_init = pl181_class_init, +}; + +static void pl181_register_types(void) +{ + type_register_static(&pl181_info); +} + +type_init(pl181_register_types) |
