| /* |
| * OMAP on-chip MMC/SD host emulation. |
| * |
| * Datasheet: TI Multimedia Card (MMC/SD/SDIO) Interface (SPRU765A) |
| * |
| * 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 "qemu/osdep.h" |
| #include "qemu/log.h" |
| #include "hw/irq.h" |
| #include "hw/arm/omap.h" |
| #include "hw/sd/sdcard_legacy.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; |
| } |
| } |
| |
| /* These must match the encoding of the MMC_CMD Response field */ |
| 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; |
| |
| /* These must match the encoding of the MMC_CMD Type field */ |
| typedef enum { |
| SD_TYPE_BC = 0, /* broadcast -- no response */ |
| SD_TYPE_BCR = 1, /* broadcast with response */ |
| SD_TYPE_AC = 2, /* addressed -- no data transfer */ |
| SD_TYPE_ADTC = 3, /* addressed with data transfer */ |
| } MMCCmdType; |
| |
| static void omap_mmc_command(struct omap_mmc_s *host, int cmd, int dir, |
| MMCCmdType 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_TYPE_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 = ldl_be_p(response); |
| 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 = ldl_be_p(response); |
| 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_byte(host->card); |
| host->fifo[(host->fifo_start + host->fifo_len) & 31] = value; |
| if (-- host->blen_counter) { |
| value = sd_read_byte(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_byte(host->card, value); |
| if (-- host->blen_counter) { |
| value = host->fifo[host->fifo_start] >> 8; |
| sd_write_byte(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); |
| } |
| |
| static void omap_mmc_pseudo_reset(struct omap_mmc_s *host) |
| { |
| host->status = 0; |
| host->fifo_len = 0; |
| } |
| |
| 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->mask = 0; |
| host->cto = 0; |
| host->dto = 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; |
| |
| omap_mmc_pseudo_reset(host); |
| |
| /* Since we're still using the legacy SD API the card is not plugged |
| * into any bus, and we must reset it manually. When omap_mmc is |
| * QOMified this must move into the QOM reset function. |
| */ |
| device_cold_reset(DEVICE(host->card)); |
| } |
| |
| static uint64_t omap_mmc_read(void *opaque, hwaddr offset, unsigned size) |
| { |
| uint16_t i; |
| struct omap_mmc_s *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 = opaque; |
| |
| if (size != 2) { |
| omap_badwidth_write16(opaque, offset, value); |
| return; |
| } |
| |
| 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, |
| (MMCCmdType)((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) { |
| qemu_log_mask(LOG_UNIMP, |
| "omap_mmc_wr: mode #%i unimplemented\n", s->mode); |
| } |
| if (s->be != 0) { |
| qemu_log_mask(LOG_UNIMP, |
| "omap_mmc_wr: Big Endian not implemented\n"); |
| } |
| if (s->dw != 0 && s->lines < 4) |
| printf("4-bit SD bus enabled\n"); |
| if (!s->enable) |
| omap_mmc_pseudo_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, |
| }; |
| |
| struct omap_mmc_s *omap_mmc_init(hwaddr base, |
| MemoryRegion *sysmem, |
| BlockBackend *blk, |
| qemu_irq irq, qemu_irq dma[], omap_clk clk) |
| { |
| struct omap_mmc_s *s = g_new0(struct omap_mmc_s, 1); |
| |
| s->irq = irq; |
| s->dma = dma; |
| s->clk = clk; |
| s->lines = 1; /* TODO: needs to be settable per-board */ |
| s->rev = 1; |
| |
| memory_region_init_io(&s->iomem, NULL, &omap_mmc_ops, s, "omap.mmc", 0x800); |
| memory_region_add_subregion(sysmem, base, &s->iomem); |
| |
| /* Instantiate the storage */ |
| s->card = sd_init(blk, false); |
| if (s->card == NULL) { |
| exit(1); |
| } |
| |
| omap_mmc_reset(s); |
| |
| return s; |
| } |
