diff options
Diffstat (limited to 'hw/sd/omap_mmc.c')
| -rw-r--r-- | hw/sd/omap_mmc.c | 641 |
1 files changed, 641 insertions, 0 deletions
diff --git a/hw/sd/omap_mmc.c b/hw/sd/omap_mmc.c new file mode 100644 index 0000000..d4079cd --- /dev/null +++ b/hw/sd/omap_mmc.c @@ -0,0 +1,641 @@ +/* + * OMAP on-chip MMC/SD host emulation. + * + * Copyright (C) 2006-2007 Andrzej Zaborowski <balrog@zabor.org> + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 or + * (at your option) version 3 of the License. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, see <http://www.gnu.org/licenses/>. + */ +#include "hw/hw.h" +#include "hw/arm/omap.h" +#include "hw/sd.h" + +struct omap_mmc_s { + qemu_irq irq; + qemu_irq *dma; + qemu_irq coverswitch; + MemoryRegion iomem; + omap_clk clk; + SDState *card; + uint16_t last_cmd; + uint16_t sdio; + uint16_t rsp[8]; + uint32_t arg; + int lines; + int dw; + int mode; + int enable; + int be; + int rev; + uint16_t status; + uint16_t mask; + uint8_t cto; + uint16_t dto; + int clkdiv; + uint16_t fifo[32]; + int fifo_start; + int fifo_len; + uint16_t blen; + uint16_t blen_counter; + uint16_t nblk; + uint16_t nblk_counter; + int tx_dma; + int rx_dma; + int af_level; + int ae_level; + + int ddir; + int transfer; + + int cdet_wakeup; + int cdet_enable; + int cdet_state; + qemu_irq cdet; +}; + +static void omap_mmc_interrupts_update(struct omap_mmc_s *s) +{ + qemu_set_irq(s->irq, !!(s->status & s->mask)); +} + +static void omap_mmc_fifolevel_update(struct omap_mmc_s *host) +{ + if (!host->transfer && !host->fifo_len) { + host->status &= 0xf3ff; + return; + } + + if (host->fifo_len > host->af_level && host->ddir) { + if (host->rx_dma) { + host->status &= 0xfbff; + qemu_irq_raise(host->dma[1]); + } else + host->status |= 0x0400; + } else { + host->status &= 0xfbff; + qemu_irq_lower(host->dma[1]); + } + + if (host->fifo_len < host->ae_level && !host->ddir) { + if (host->tx_dma) { + host->status &= 0xf7ff; + qemu_irq_raise(host->dma[0]); + } else + host->status |= 0x0800; + } else { + qemu_irq_lower(host->dma[0]); + host->status &= 0xf7ff; + } +} + +typedef enum { + sd_nore = 0, /* no response */ + sd_r1, /* normal response command */ + sd_r2, /* CID, CSD registers */ + sd_r3, /* OCR register */ + sd_r6 = 6, /* Published RCA response */ + sd_r1b = -1, +} sd_rsp_type_t; + +static void omap_mmc_command(struct omap_mmc_s *host, int cmd, int dir, + sd_cmd_type_t type, int busy, sd_rsp_type_t resptype, int init) +{ + uint32_t rspstatus, mask; + int rsplen, timeout; + SDRequest request; + uint8_t response[16]; + + if (init && cmd == 0) { + host->status |= 0x0001; + return; + } + + if (resptype == sd_r1 && busy) + resptype = sd_r1b; + + if (type == sd_adtc) { + host->fifo_start = 0; + host->fifo_len = 0; + host->transfer = 1; + host->ddir = dir; + } else + host->transfer = 0; + timeout = 0; + mask = 0; + rspstatus = 0; + + request.cmd = cmd; + request.arg = host->arg; + request.crc = 0; /* FIXME */ + + rsplen = sd_do_command(host->card, &request, response); + + /* TODO: validate CRCs */ + switch (resptype) { + case sd_nore: + rsplen = 0; + break; + + case sd_r1: + case sd_r1b: + if (rsplen < 4) { + timeout = 1; + break; + } + rsplen = 4; + + mask = OUT_OF_RANGE | ADDRESS_ERROR | BLOCK_LEN_ERROR | + ERASE_SEQ_ERROR | ERASE_PARAM | WP_VIOLATION | + LOCK_UNLOCK_FAILED | COM_CRC_ERROR | ILLEGAL_COMMAND | + CARD_ECC_FAILED | CC_ERROR | SD_ERROR | + CID_CSD_OVERWRITE; + if (host->sdio & (1 << 13)) + mask |= AKE_SEQ_ERROR; + rspstatus = (response[0] << 24) | (response[1] << 16) | + (response[2] << 8) | (response[3] << 0); + break; + + case sd_r2: + if (rsplen < 16) { + timeout = 1; + break; + } + rsplen = 16; + break; + + case sd_r3: + if (rsplen < 4) { + timeout = 1; + break; + } + rsplen = 4; + + rspstatus = (response[0] << 24) | (response[1] << 16) | + (response[2] << 8) | (response[3] << 0); + if (rspstatus & 0x80000000) + host->status &= 0xe000; + else + host->status |= 0x1000; + break; + + case sd_r6: + if (rsplen < 4) { + timeout = 1; + break; + } + rsplen = 4; + + mask = 0xe000 | AKE_SEQ_ERROR; + rspstatus = (response[2] << 8) | (response[3] << 0); + } + + if (rspstatus & mask) + host->status |= 0x4000; + else + host->status &= 0xb000; + + if (rsplen) + for (rsplen = 0; rsplen < 8; rsplen ++) + host->rsp[~rsplen & 7] = response[(rsplen << 1) | 1] | + (response[(rsplen << 1) | 0] << 8); + + if (timeout) + host->status |= 0x0080; + else if (cmd == 12) + host->status |= 0x0005; /* Makes it more real */ + else + host->status |= 0x0001; +} + +static void omap_mmc_transfer(struct omap_mmc_s *host) +{ + uint8_t value; + + if (!host->transfer) + return; + + while (1) { + if (host->ddir) { + if (host->fifo_len > host->af_level) + break; + + value = sd_read_data(host->card); + host->fifo[(host->fifo_start + host->fifo_len) & 31] = value; + if (-- host->blen_counter) { + value = sd_read_data(host->card); + host->fifo[(host->fifo_start + host->fifo_len) & 31] |= + value << 8; + host->blen_counter --; + } + + host->fifo_len ++; + } else { + if (!host->fifo_len) + break; + + value = host->fifo[host->fifo_start] & 0xff; + sd_write_data(host->card, value); + if (-- host->blen_counter) { + value = host->fifo[host->fifo_start] >> 8; + sd_write_data(host->card, value); + host->blen_counter --; + } + + host->fifo_start ++; + host->fifo_len --; + host->fifo_start &= 31; + } + + if (host->blen_counter == 0) { + host->nblk_counter --; + host->blen_counter = host->blen; + + if (host->nblk_counter == 0) { + host->nblk_counter = host->nblk; + host->transfer = 0; + host->status |= 0x0008; + break; + } + } + } +} + +static void omap_mmc_update(void *opaque) +{ + struct omap_mmc_s *s = opaque; + omap_mmc_transfer(s); + omap_mmc_fifolevel_update(s); + omap_mmc_interrupts_update(s); +} + +void omap_mmc_reset(struct omap_mmc_s *host) +{ + host->last_cmd = 0; + memset(host->rsp, 0, sizeof(host->rsp)); + host->arg = 0; + host->dw = 0; + host->mode = 0; + host->enable = 0; + host->status = 0; + host->mask = 0; + host->cto = 0; + host->dto = 0; + host->fifo_len = 0; + host->blen = 0; + host->blen_counter = 0; + host->nblk = 0; + host->nblk_counter = 0; + host->tx_dma = 0; + host->rx_dma = 0; + host->ae_level = 0x00; + host->af_level = 0x1f; + host->transfer = 0; + host->cdet_wakeup = 0; + host->cdet_enable = 0; + qemu_set_irq(host->coverswitch, host->cdet_state); + host->clkdiv = 0; +} + +static uint64_t omap_mmc_read(void *opaque, hwaddr offset, + unsigned size) +{ + uint16_t i; + struct omap_mmc_s *s = (struct omap_mmc_s *) opaque; + + if (size != 2) { + return omap_badwidth_read16(opaque, offset); + } + + switch (offset) { + case 0x00: /* MMC_CMD */ + return s->last_cmd; + + case 0x04: /* MMC_ARGL */ + return s->arg & 0x0000ffff; + + case 0x08: /* MMC_ARGH */ + return s->arg >> 16; + + case 0x0c: /* MMC_CON */ + return (s->dw << 15) | (s->mode << 12) | (s->enable << 11) | + (s->be << 10) | s->clkdiv; + + case 0x10: /* MMC_STAT */ + return s->status; + + case 0x14: /* MMC_IE */ + return s->mask; + + case 0x18: /* MMC_CTO */ + return s->cto; + + case 0x1c: /* MMC_DTO */ + return s->dto; + + case 0x20: /* MMC_DATA */ + /* TODO: support 8-bit access */ + i = s->fifo[s->fifo_start]; + if (s->fifo_len == 0) { + printf("MMC: FIFO underrun\n"); + return i; + } + s->fifo_start ++; + s->fifo_len --; + s->fifo_start &= 31; + omap_mmc_transfer(s); + omap_mmc_fifolevel_update(s); + omap_mmc_interrupts_update(s); + return i; + + case 0x24: /* MMC_BLEN */ + return s->blen_counter; + + case 0x28: /* MMC_NBLK */ + return s->nblk_counter; + + case 0x2c: /* MMC_BUF */ + return (s->rx_dma << 15) | (s->af_level << 8) | + (s->tx_dma << 7) | s->ae_level; + + case 0x30: /* MMC_SPI */ + return 0x0000; + case 0x34: /* MMC_SDIO */ + return (s->cdet_wakeup << 2) | (s->cdet_enable) | s->sdio; + case 0x38: /* MMC_SYST */ + return 0x0000; + + case 0x3c: /* MMC_REV */ + return s->rev; + + case 0x40: /* MMC_RSP0 */ + case 0x44: /* MMC_RSP1 */ + case 0x48: /* MMC_RSP2 */ + case 0x4c: /* MMC_RSP3 */ + case 0x50: /* MMC_RSP4 */ + case 0x54: /* MMC_RSP5 */ + case 0x58: /* MMC_RSP6 */ + case 0x5c: /* MMC_RSP7 */ + return s->rsp[(offset - 0x40) >> 2]; + + /* OMAP2-specific */ + case 0x60: /* MMC_IOSR */ + case 0x64: /* MMC_SYSC */ + return 0; + case 0x68: /* MMC_SYSS */ + return 1; /* RSTD */ + } + + OMAP_BAD_REG(offset); + return 0; +} + +static void omap_mmc_write(void *opaque, hwaddr offset, + uint64_t value, unsigned size) +{ + int i; + struct omap_mmc_s *s = (struct omap_mmc_s *) opaque; + + if (size != 2) { + return omap_badwidth_write16(opaque, offset, value); + } + + switch (offset) { + case 0x00: /* MMC_CMD */ + if (!s->enable) + break; + + s->last_cmd = value; + for (i = 0; i < 8; i ++) + s->rsp[i] = 0x0000; + omap_mmc_command(s, value & 63, (value >> 15) & 1, + (sd_cmd_type_t) ((value >> 12) & 3), + (value >> 11) & 1, + (sd_rsp_type_t) ((value >> 8) & 7), + (value >> 7) & 1); + omap_mmc_update(s); + break; + + case 0x04: /* MMC_ARGL */ + s->arg &= 0xffff0000; + s->arg |= 0x0000ffff & value; + break; + + case 0x08: /* MMC_ARGH */ + s->arg &= 0x0000ffff; + s->arg |= value << 16; + break; + + case 0x0c: /* MMC_CON */ + s->dw = (value >> 15) & 1; + s->mode = (value >> 12) & 3; + s->enable = (value >> 11) & 1; + s->be = (value >> 10) & 1; + s->clkdiv = (value >> 0) & (s->rev >= 2 ? 0x3ff : 0xff); + if (s->mode != 0) + printf("SD mode %i unimplemented!\n", s->mode); + if (s->be != 0) + printf("SD FIFO byte sex unimplemented!\n"); + if (s->dw != 0 && s->lines < 4) + printf("4-bit SD bus enabled\n"); + if (!s->enable) + omap_mmc_reset(s); + break; + + case 0x10: /* MMC_STAT */ + s->status &= ~value; + omap_mmc_interrupts_update(s); + break; + + case 0x14: /* MMC_IE */ + s->mask = value & 0x7fff; + omap_mmc_interrupts_update(s); + break; + + case 0x18: /* MMC_CTO */ + s->cto = value & 0xff; + if (s->cto > 0xfd && s->rev <= 1) + printf("MMC: CTO of 0xff and 0xfe cannot be used!\n"); + break; + + case 0x1c: /* MMC_DTO */ + s->dto = value & 0xffff; + break; + + case 0x20: /* MMC_DATA */ + /* TODO: support 8-bit access */ + if (s->fifo_len == 32) + break; + s->fifo[(s->fifo_start + s->fifo_len) & 31] = value; + s->fifo_len ++; + omap_mmc_transfer(s); + omap_mmc_fifolevel_update(s); + omap_mmc_interrupts_update(s); + break; + + case 0x24: /* MMC_BLEN */ + s->blen = (value & 0x07ff) + 1; + s->blen_counter = s->blen; + break; + + case 0x28: /* MMC_NBLK */ + s->nblk = (value & 0x07ff) + 1; + s->nblk_counter = s->nblk; + s->blen_counter = s->blen; + break; + + case 0x2c: /* MMC_BUF */ + s->rx_dma = (value >> 15) & 1; + s->af_level = (value >> 8) & 0x1f; + s->tx_dma = (value >> 7) & 1; + s->ae_level = value & 0x1f; + + if (s->rx_dma) + s->status &= 0xfbff; + if (s->tx_dma) + s->status &= 0xf7ff; + omap_mmc_fifolevel_update(s); + omap_mmc_interrupts_update(s); + break; + + /* SPI, SDIO and TEST modes unimplemented */ + case 0x30: /* MMC_SPI (OMAP1 only) */ + break; + case 0x34: /* MMC_SDIO */ + s->sdio = value & (s->rev >= 2 ? 0xfbf3 : 0x2020); + s->cdet_wakeup = (value >> 9) & 1; + s->cdet_enable = (value >> 2) & 1; + break; + case 0x38: /* MMC_SYST */ + break; + + case 0x3c: /* MMC_REV */ + case 0x40: /* MMC_RSP0 */ + case 0x44: /* MMC_RSP1 */ + case 0x48: /* MMC_RSP2 */ + case 0x4c: /* MMC_RSP3 */ + case 0x50: /* MMC_RSP4 */ + case 0x54: /* MMC_RSP5 */ + case 0x58: /* MMC_RSP6 */ + case 0x5c: /* MMC_RSP7 */ + OMAP_RO_REG(offset); + break; + + /* OMAP2-specific */ + case 0x60: /* MMC_IOSR */ + if (value & 0xf) + printf("MMC: SDIO bits used!\n"); + break; + case 0x64: /* MMC_SYSC */ + if (value & (1 << 2)) /* SRTS */ + omap_mmc_reset(s); + break; + case 0x68: /* MMC_SYSS */ + OMAP_RO_REG(offset); + break; + + default: + OMAP_BAD_REG(offset); + } +} + +static const MemoryRegionOps omap_mmc_ops = { + .read = omap_mmc_read, + .write = omap_mmc_write, + .endianness = DEVICE_NATIVE_ENDIAN, +}; + +static void omap_mmc_cover_cb(void *opaque, int line, int level) +{ + struct omap_mmc_s *host = (struct omap_mmc_s *) opaque; + + if (!host->cdet_state && level) { + host->status |= 0x0002; + omap_mmc_interrupts_update(host); + if (host->cdet_wakeup) { + /* TODO: Assert wake-up */ + } + } + + if (host->cdet_state != level) { + qemu_set_irq(host->coverswitch, level); + host->cdet_state = level; + } +} + +struct omap_mmc_s *omap_mmc_init(hwaddr base, + MemoryRegion *sysmem, + BlockDriverState *bd, + qemu_irq irq, qemu_irq dma[], omap_clk clk) +{ + struct omap_mmc_s *s = (struct omap_mmc_s *) + g_malloc0(sizeof(struct omap_mmc_s)); + + s->irq = irq; + s->dma = dma; + s->clk = clk; + s->lines = 1; /* TODO: needs to be settable per-board */ + s->rev = 1; + + omap_mmc_reset(s); + + memory_region_init_io(&s->iomem, &omap_mmc_ops, s, "omap.mmc", 0x800); + memory_region_add_subregion(sysmem, base, &s->iomem); + + /* Instantiate the storage */ + s->card = sd_init(bd, 0); + + return s; +} + +struct omap_mmc_s *omap2_mmc_init(struct omap_target_agent_s *ta, + BlockDriverState *bd, qemu_irq irq, qemu_irq dma[], + omap_clk fclk, omap_clk iclk) +{ + struct omap_mmc_s *s = (struct omap_mmc_s *) + g_malloc0(sizeof(struct omap_mmc_s)); + + s->irq = irq; + s->dma = dma; + s->clk = fclk; + s->lines = 4; + s->rev = 2; + + omap_mmc_reset(s); + + memory_region_init_io(&s->iomem, &omap_mmc_ops, s, "omap.mmc", + omap_l4_region_size(ta, 0)); + omap_l4_attach(ta, 0, &s->iomem); + + /* Instantiate the storage */ + s->card = sd_init(bd, 0); + + s->cdet = qemu_allocate_irqs(omap_mmc_cover_cb, s, 1)[0]; + sd_set_cb(s->card, NULL, s->cdet); + + return s; +} + +void omap_mmc_handlers(struct omap_mmc_s *s, qemu_irq ro, qemu_irq cover) +{ + if (s->cdet) { + sd_set_cb(s->card, ro, s->cdet); + s->coverswitch = cover; + qemu_set_irq(cover, s->cdet_state); + } else + sd_set_cb(s->card, ro, cover); +} + +void omap_mmc_enable(struct omap_mmc_s *s, int enable) +{ + sd_enable(s->card, enable); +} |