/* * 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.h" #include "omap.h" #include "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); }