diff options
Diffstat (limited to 'src/hw/misc/omap_gpmc.c')
| -rw-r--r-- | src/hw/misc/omap_gpmc.c | 896 |
1 files changed, 896 insertions, 0 deletions
diff --git a/src/hw/misc/omap_gpmc.c b/src/hw/misc/omap_gpmc.c new file mode 100644 index 0000000..8960f1b --- /dev/null +++ b/src/hw/misc/omap_gpmc.c @@ -0,0 +1,896 @@ +/* + * TI OMAP general purpose memory controller emulation. + * + * Copyright (C) 2007-2009 Nokia Corporation + * Original code written by Andrzej Zaborowski <andrew@openedhand.com> + * Enhancements for OMAP3 and NAND support written by Juha Riihimäki + * + * 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) any later version 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/block/flash.h" +#include "hw/arm/omap.h" +#include "exec/memory.h" +#include "exec/address-spaces.h" + +/* General-Purpose Memory Controller */ +struct omap_gpmc_s { + qemu_irq irq; + qemu_irq drq; + MemoryRegion iomem; + int accept_256; + + uint8_t revision; + uint8_t sysconfig; + uint16_t irqst; + uint16_t irqen; + uint16_t lastirq; + uint16_t timeout; + uint16_t config; + struct omap_gpmc_cs_file_s { + uint32_t config[7]; + MemoryRegion *iomem; + MemoryRegion container; + MemoryRegion nandiomem; + DeviceState *dev; + } cs_file[8]; + int ecc_cs; + int ecc_ptr; + uint32_t ecc_cfg; + ECCState ecc[9]; + struct prefetch { + uint32_t config1; /* GPMC_PREFETCH_CONFIG1 */ + uint32_t transfercount; /* GPMC_PREFETCH_CONFIG2:TRANSFERCOUNT */ + int startengine; /* GPMC_PREFETCH_CONTROL:STARTENGINE */ + int fifopointer; /* GPMC_PREFETCH_STATUS:FIFOPOINTER */ + int count; /* GPMC_PREFETCH_STATUS:COUNTVALUE */ + MemoryRegion iomem; + uint8_t fifo[64]; + } prefetch; +}; + +#define OMAP_GPMC_8BIT 0 +#define OMAP_GPMC_16BIT 1 +#define OMAP_GPMC_NOR 0 +#define OMAP_GPMC_NAND 2 + +static int omap_gpmc_devtype(struct omap_gpmc_cs_file_s *f) +{ + return (f->config[0] >> 10) & 3; +} + +static int omap_gpmc_devsize(struct omap_gpmc_cs_file_s *f) +{ + /* devsize field is really 2 bits but we ignore the high + * bit to ensure consistent behaviour if the guest sets + * it (values 2 and 3 are reserved in the TRM) + */ + return (f->config[0] >> 12) & 1; +} + +/* Extract the chip-select value from the prefetch config1 register */ +static int prefetch_cs(uint32_t config1) +{ + return (config1 >> 24) & 7; +} + +static int prefetch_threshold(uint32_t config1) +{ + return (config1 >> 8) & 0x7f; +} + +static void omap_gpmc_int_update(struct omap_gpmc_s *s) +{ + /* The TRM is a bit unclear, but it seems to say that + * the TERMINALCOUNTSTATUS bit is set only on the + * transition when the prefetch engine goes from + * active to inactive, whereas the FIFOEVENTSTATUS + * bit is held high as long as the fifo has at + * least THRESHOLD bytes available. + * So we do the latter here, but TERMINALCOUNTSTATUS + * is set elsewhere. + */ + if (s->prefetch.fifopointer >= prefetch_threshold(s->prefetch.config1)) { + s->irqst |= 1; + } + if ((s->irqen & s->irqst) != s->lastirq) { + s->lastirq = s->irqen & s->irqst; + qemu_set_irq(s->irq, s->lastirq); + } +} + +static void omap_gpmc_dma_update(struct omap_gpmc_s *s, int value) +{ + if (s->prefetch.config1 & 4) { + qemu_set_irq(s->drq, value); + } +} + +/* Access functions for when a NAND-like device is mapped into memory: + * all addresses in the region behave like accesses to the relevant + * GPMC_NAND_DATA_i register (which is actually implemented to call these) + */ +static uint64_t omap_nand_read(void *opaque, hwaddr addr, + unsigned size) +{ + struct omap_gpmc_cs_file_s *f = (struct omap_gpmc_cs_file_s *)opaque; + uint64_t v; + nand_setpins(f->dev, 0, 0, 0, 1, 0); + switch (omap_gpmc_devsize(f)) { + case OMAP_GPMC_8BIT: + v = nand_getio(f->dev); + if (size == 1) { + return v; + } + v |= (nand_getio(f->dev) << 8); + if (size == 2) { + return v; + } + v |= (nand_getio(f->dev) << 16); + v |= (nand_getio(f->dev) << 24); + return v; + case OMAP_GPMC_16BIT: + v = nand_getio(f->dev); + if (size == 1) { + /* 8 bit read from 16 bit device : probably a guest bug */ + return v & 0xff; + } + if (size == 2) { + return v; + } + v |= (nand_getio(f->dev) << 16); + return v; + default: + abort(); + } +} + +static void omap_nand_setio(DeviceState *dev, uint64_t value, + int nandsize, int size) +{ + /* Write the specified value to the NAND device, respecting + * both size of the NAND device and size of the write access. + */ + switch (nandsize) { + case OMAP_GPMC_8BIT: + switch (size) { + case 1: + nand_setio(dev, value & 0xff); + break; + case 2: + nand_setio(dev, value & 0xff); + nand_setio(dev, (value >> 8) & 0xff); + break; + case 4: + default: + nand_setio(dev, value & 0xff); + nand_setio(dev, (value >> 8) & 0xff); + nand_setio(dev, (value >> 16) & 0xff); + nand_setio(dev, (value >> 24) & 0xff); + break; + } + break; + case OMAP_GPMC_16BIT: + switch (size) { + case 1: + /* writing to a 16bit device with 8bit access is probably a guest + * bug; pass the value through anyway. + */ + case 2: + nand_setio(dev, value & 0xffff); + break; + case 4: + default: + nand_setio(dev, value & 0xffff); + nand_setio(dev, (value >> 16) & 0xffff); + break; + } + break; + } +} + +static void omap_nand_write(void *opaque, hwaddr addr, + uint64_t value, unsigned size) +{ + struct omap_gpmc_cs_file_s *f = (struct omap_gpmc_cs_file_s *)opaque; + nand_setpins(f->dev, 0, 0, 0, 1, 0); + omap_nand_setio(f->dev, value, omap_gpmc_devsize(f), size); +} + +static const MemoryRegionOps omap_nand_ops = { + .read = omap_nand_read, + .write = omap_nand_write, + .endianness = DEVICE_NATIVE_ENDIAN, +}; + +static void fill_prefetch_fifo(struct omap_gpmc_s *s) +{ + /* Fill the prefetch FIFO by reading data from NAND. + * We do this synchronously, unlike the hardware which + * will do this asynchronously. We refill when the + * FIFO has THRESHOLD bytes free, and we always refill + * as much data as possible starting at the top end + * of the FIFO. + * (We have to refill at THRESHOLD rather than waiting + * for the FIFO to empty to allow for the case where + * the FIFO size isn't an exact multiple of THRESHOLD + * and we're doing DMA transfers.) + * This means we never need to handle wrap-around in + * the fifo-reading code, and the next byte of data + * to read is always fifo[63 - fifopointer]. + */ + int fptr; + int cs = prefetch_cs(s->prefetch.config1); + int is16bit = (((s->cs_file[cs].config[0] >> 12) & 3) != 0); + int bytes; + /* Don't believe the bit of the OMAP TRM that says that COUNTVALUE + * and TRANSFERCOUNT are in units of 16 bit words for 16 bit NAND. + * Instead believe the bit that says it is always a byte count. + */ + bytes = 64 - s->prefetch.fifopointer; + if (bytes > s->prefetch.count) { + bytes = s->prefetch.count; + } + if (is16bit) { + bytes &= ~1; + } + + s->prefetch.count -= bytes; + s->prefetch.fifopointer += bytes; + fptr = 64 - s->prefetch.fifopointer; + /* Move the existing data in the FIFO so it sits just + * before what we're about to read in + */ + while (fptr < (64 - bytes)) { + s->prefetch.fifo[fptr] = s->prefetch.fifo[fptr + bytes]; + fptr++; + } + while (fptr < 64) { + if (is16bit) { + uint32_t v = omap_nand_read(&s->cs_file[cs], 0, 2); + s->prefetch.fifo[fptr++] = v & 0xff; + s->prefetch.fifo[fptr++] = (v >> 8) & 0xff; + } else { + s->prefetch.fifo[fptr++] = omap_nand_read(&s->cs_file[cs], 0, 1); + } + } + if (s->prefetch.startengine && (s->prefetch.count == 0)) { + /* This was the final transfer: raise TERMINALCOUNTSTATUS */ + s->irqst |= 2; + s->prefetch.startengine = 0; + } + /* If there are any bytes in the FIFO at this point then + * we must raise a DMA request (either this is a final part + * transfer, or we filled the FIFO in which case we certainly + * have THRESHOLD bytes available) + */ + if (s->prefetch.fifopointer != 0) { + omap_gpmc_dma_update(s, 1); + } + omap_gpmc_int_update(s); +} + +/* Access functions for a NAND-like device when the prefetch/postwrite + * engine is enabled -- all addresses in the region behave alike: + * data is read or written to the FIFO. + */ +static uint64_t omap_gpmc_prefetch_read(void *opaque, hwaddr addr, + unsigned size) +{ + struct omap_gpmc_s *s = (struct omap_gpmc_s *) opaque; + uint32_t data; + if (s->prefetch.config1 & 1) { + /* The TRM doesn't define the behaviour if you read from the + * FIFO when the prefetch engine is in write mode. We choose + * to always return zero. + */ + return 0; + } + /* Note that trying to read an empty fifo repeats the last byte */ + if (s->prefetch.fifopointer) { + s->prefetch.fifopointer--; + } + data = s->prefetch.fifo[63 - s->prefetch.fifopointer]; + if (s->prefetch.fifopointer == + (64 - prefetch_threshold(s->prefetch.config1))) { + /* We've drained THRESHOLD bytes now. So deassert the + * DMA request, then refill the FIFO (which will probably + * assert it again.) + */ + omap_gpmc_dma_update(s, 0); + fill_prefetch_fifo(s); + } + omap_gpmc_int_update(s); + return data; +} + +static void omap_gpmc_prefetch_write(void *opaque, hwaddr addr, + uint64_t value, unsigned size) +{ + struct omap_gpmc_s *s = (struct omap_gpmc_s *) opaque; + int cs = prefetch_cs(s->prefetch.config1); + if ((s->prefetch.config1 & 1) == 0) { + /* The TRM doesn't define the behaviour of writing to the + * FIFO when the prefetch engine is in read mode. We + * choose to ignore the write. + */ + return; + } + if (s->prefetch.count == 0) { + /* The TRM doesn't define the behaviour of writing to the + * FIFO if the transfer is complete. We choose to ignore. + */ + return; + } + /* The only reason we do any data buffering in postwrite + * mode is if we are talking to a 16 bit NAND device, in + * which case we need to buffer the first byte of the + * 16 bit word until the other byte arrives. + */ + int is16bit = (((s->cs_file[cs].config[0] >> 12) & 3) != 0); + if (is16bit) { + /* fifopointer alternates between 64 (waiting for first + * byte of word) and 63 (waiting for second byte) + */ + if (s->prefetch.fifopointer == 64) { + s->prefetch.fifo[0] = value; + s->prefetch.fifopointer--; + } else { + value = (value << 8) | s->prefetch.fifo[0]; + omap_nand_write(&s->cs_file[cs], 0, value, 2); + s->prefetch.count--; + s->prefetch.fifopointer = 64; + } + } else { + /* Just write the byte : fifopointer remains 64 at all times */ + omap_nand_write(&s->cs_file[cs], 0, value, 1); + s->prefetch.count--; + } + if (s->prefetch.count == 0) { + /* Final transfer: raise TERMINALCOUNTSTATUS */ + s->irqst |= 2; + s->prefetch.startengine = 0; + } + omap_gpmc_int_update(s); +} + +static const MemoryRegionOps omap_prefetch_ops = { + .read = omap_gpmc_prefetch_read, + .write = omap_gpmc_prefetch_write, + .endianness = DEVICE_NATIVE_ENDIAN, + .impl.min_access_size = 1, + .impl.max_access_size = 1, +}; + +static MemoryRegion *omap_gpmc_cs_memregion(struct omap_gpmc_s *s, int cs) +{ + /* Return the MemoryRegion* to map/unmap for this chipselect */ + struct omap_gpmc_cs_file_s *f = &s->cs_file[cs]; + if (omap_gpmc_devtype(f) == OMAP_GPMC_NOR) { + return f->iomem; + } + if ((s->prefetch.config1 & 0x80) && + (prefetch_cs(s->prefetch.config1) == cs)) { + /* The prefetch engine is enabled for this CS: map the FIFO */ + return &s->prefetch.iomem; + } + return &f->nandiomem; +} + +static void omap_gpmc_cs_map(struct omap_gpmc_s *s, int cs) +{ + struct omap_gpmc_cs_file_s *f = &s->cs_file[cs]; + uint32_t mask = (f->config[6] >> 8) & 0xf; + uint32_t base = f->config[6] & 0x3f; + uint32_t size; + + if (!f->iomem && !f->dev) { + return; + } + + if (!(f->config[6] & (1 << 6))) { + /* Do nothing unless CSVALID */ + return; + } + + /* TODO: check for overlapping regions and report access errors */ + if (mask != 0x8 && mask != 0xc && mask != 0xe && mask != 0xf + && !(s->accept_256 && !mask)) { + fprintf(stderr, "%s: invalid chip-select mask address (0x%x)\n", + __func__, mask); + } + + base <<= 24; + size = (0x0fffffff & ~(mask << 24)) + 1; + /* TODO: rather than setting the size of the mapping (which should be + * constant), the mask should cause wrapping of the address space, so + * that the same memory becomes accessible at every <i>size</i> bytes + * starting from <i>base</i>. */ + memory_region_init(&f->container, NULL, "omap-gpmc-file", size); + memory_region_add_subregion(&f->container, 0, + omap_gpmc_cs_memregion(s, cs)); + memory_region_add_subregion(get_system_memory(), base, + &f->container); +} + +static void omap_gpmc_cs_unmap(struct omap_gpmc_s *s, int cs) +{ + struct omap_gpmc_cs_file_s *f = &s->cs_file[cs]; + if (!(f->config[6] & (1 << 6))) { + /* Do nothing unless CSVALID */ + return; + } + if (!f->iomem && !f->dev) { + return; + } + memory_region_del_subregion(get_system_memory(), &f->container); + memory_region_del_subregion(&f->container, omap_gpmc_cs_memregion(s, cs)); + object_unparent(OBJECT(&f->container)); +} + +void omap_gpmc_reset(struct omap_gpmc_s *s) +{ + int i; + + s->sysconfig = 0; + s->irqst = 0; + s->irqen = 0; + omap_gpmc_int_update(s); + for (i = 0; i < 8; i++) { + /* This has to happen before we change any of the config + * used to determine which memory regions are mapped or unmapped. + */ + omap_gpmc_cs_unmap(s, i); + } + s->timeout = 0; + s->config = 0xa00; + s->prefetch.config1 = 0x00004000; + s->prefetch.transfercount = 0x00000000; + s->prefetch.startengine = 0; + s->prefetch.fifopointer = 0; + s->prefetch.count = 0; + for (i = 0; i < 8; i ++) { + s->cs_file[i].config[1] = 0x101001; + s->cs_file[i].config[2] = 0x020201; + s->cs_file[i].config[3] = 0x10031003; + s->cs_file[i].config[4] = 0x10f1111; + s->cs_file[i].config[5] = 0; + s->cs_file[i].config[6] = 0xf00; + /* In theory we could probe attached devices for some CFG1 + * bits here, but we just retain them across resets as they + * were set initially by omap_gpmc_attach(). + */ + if (i == 0) { + s->cs_file[i].config[0] &= 0x00433e00; + s->cs_file[i].config[6] |= 1 << 6; /* CSVALID */ + omap_gpmc_cs_map(s, i); + } else { + s->cs_file[i].config[0] &= 0x00403c00; + } + } + s->ecc_cs = 0; + s->ecc_ptr = 0; + s->ecc_cfg = 0x3fcff000; + for (i = 0; i < 9; i ++) + ecc_reset(&s->ecc[i]); +} + +static int gpmc_wordaccess_only(hwaddr addr) +{ + /* Return true if the register offset is to a register that + * only permits word width accesses. + * Non-word accesses are only OK for GPMC_NAND_DATA/ADDRESS/COMMAND + * for any chipselect. + */ + if (addr >= 0x60 && addr <= 0x1d4) { + int cs = (addr - 0x60) / 0x30; + addr -= cs * 0x30; + if (addr >= 0x7c && addr < 0x88) { + /* GPMC_NAND_COMMAND, GPMC_NAND_ADDRESS, GPMC_NAND_DATA */ + return 0; + } + } + return 1; +} + +static uint64_t omap_gpmc_read(void *opaque, hwaddr addr, + unsigned size) +{ + struct omap_gpmc_s *s = (struct omap_gpmc_s *) opaque; + int cs; + struct omap_gpmc_cs_file_s *f; + + if (size != 4 && gpmc_wordaccess_only(addr)) { + return omap_badwidth_read32(opaque, addr); + } + + switch (addr) { + case 0x000: /* GPMC_REVISION */ + return s->revision; + + case 0x010: /* GPMC_SYSCONFIG */ + return s->sysconfig; + + case 0x014: /* GPMC_SYSSTATUS */ + return 1; /* RESETDONE */ + + case 0x018: /* GPMC_IRQSTATUS */ + return s->irqst; + + case 0x01c: /* GPMC_IRQENABLE */ + return s->irqen; + + case 0x040: /* GPMC_TIMEOUT_CONTROL */ + return s->timeout; + + case 0x044: /* GPMC_ERR_ADDRESS */ + case 0x048: /* GPMC_ERR_TYPE */ + return 0; + + case 0x050: /* GPMC_CONFIG */ + return s->config; + + case 0x054: /* GPMC_STATUS */ + return 0x001; + + case 0x060 ... 0x1d4: + cs = (addr - 0x060) / 0x30; + addr -= cs * 0x30; + f = s->cs_file + cs; + switch (addr) { + case 0x60: /* GPMC_CONFIG1 */ + return f->config[0]; + case 0x64: /* GPMC_CONFIG2 */ + return f->config[1]; + case 0x68: /* GPMC_CONFIG3 */ + return f->config[2]; + case 0x6c: /* GPMC_CONFIG4 */ + return f->config[3]; + case 0x70: /* GPMC_CONFIG5 */ + return f->config[4]; + case 0x74: /* GPMC_CONFIG6 */ + return f->config[5]; + case 0x78: /* GPMC_CONFIG7 */ + return f->config[6]; + case 0x84 ... 0x87: /* GPMC_NAND_DATA */ + if (omap_gpmc_devtype(f) == OMAP_GPMC_NAND) { + return omap_nand_read(f, 0, size); + } + return 0; + } + break; + + case 0x1e0: /* GPMC_PREFETCH_CONFIG1 */ + return s->prefetch.config1; + case 0x1e4: /* GPMC_PREFETCH_CONFIG2 */ + return s->prefetch.transfercount; + case 0x1ec: /* GPMC_PREFETCH_CONTROL */ + return s->prefetch.startengine; + case 0x1f0: /* GPMC_PREFETCH_STATUS */ + /* NB: The OMAP3 TRM is inconsistent about whether the GPMC + * FIFOTHRESHOLDSTATUS bit should be set when + * FIFOPOINTER > FIFOTHRESHOLD or when it is >= FIFOTHRESHOLD. + * Apparently the underlying functional spec from which the TRM was + * created states that the behaviour is ">=", and this also + * makes more conceptual sense. + */ + return (s->prefetch.fifopointer << 24) | + ((s->prefetch.fifopointer >= + ((s->prefetch.config1 >> 8) & 0x7f) ? 1 : 0) << 16) | + s->prefetch.count; + + case 0x1f4: /* GPMC_ECC_CONFIG */ + return s->ecc_cs; + case 0x1f8: /* GPMC_ECC_CONTROL */ + return s->ecc_ptr; + case 0x1fc: /* GPMC_ECC_SIZE_CONFIG */ + return s->ecc_cfg; + case 0x200 ... 0x220: /* GPMC_ECC_RESULT */ + cs = (addr & 0x1f) >> 2; + /* TODO: check correctness */ + return + ((s->ecc[cs].cp & 0x07) << 0) | + ((s->ecc[cs].cp & 0x38) << 13) | + ((s->ecc[cs].lp[0] & 0x1ff) << 3) | + ((s->ecc[cs].lp[1] & 0x1ff) << 19); + + case 0x230: /* GPMC_TESTMODE_CTRL */ + return 0; + case 0x234: /* GPMC_PSA_LSB */ + case 0x238: /* GPMC_PSA_MSB */ + return 0x00000000; + } + + OMAP_BAD_REG(addr); + return 0; +} + +static void omap_gpmc_write(void *opaque, hwaddr addr, + uint64_t value, unsigned size) +{ + struct omap_gpmc_s *s = (struct omap_gpmc_s *) opaque; + int cs; + struct omap_gpmc_cs_file_s *f; + + if (size != 4 && gpmc_wordaccess_only(addr)) { + omap_badwidth_write32(opaque, addr, value); + return; + } + + switch (addr) { + case 0x000: /* GPMC_REVISION */ + case 0x014: /* GPMC_SYSSTATUS */ + case 0x054: /* GPMC_STATUS */ + case 0x1f0: /* GPMC_PREFETCH_STATUS */ + case 0x200 ... 0x220: /* GPMC_ECC_RESULT */ + case 0x234: /* GPMC_PSA_LSB */ + case 0x238: /* GPMC_PSA_MSB */ + OMAP_RO_REG(addr); + break; + + case 0x010: /* GPMC_SYSCONFIG */ + if ((value >> 3) == 0x3) + fprintf(stderr, "%s: bad SDRAM idle mode %"PRIi64"\n", + __FUNCTION__, value >> 3); + if (value & 2) + omap_gpmc_reset(s); + s->sysconfig = value & 0x19; + break; + + case 0x018: /* GPMC_IRQSTATUS */ + s->irqst &= ~value; + omap_gpmc_int_update(s); + break; + + case 0x01c: /* GPMC_IRQENABLE */ + s->irqen = value & 0xf03; + omap_gpmc_int_update(s); + break; + + case 0x040: /* GPMC_TIMEOUT_CONTROL */ + s->timeout = value & 0x1ff1; + break; + + case 0x044: /* GPMC_ERR_ADDRESS */ + case 0x048: /* GPMC_ERR_TYPE */ + break; + + case 0x050: /* GPMC_CONFIG */ + s->config = value & 0xf13; + break; + + case 0x060 ... 0x1d4: + cs = (addr - 0x060) / 0x30; + addr -= cs * 0x30; + f = s->cs_file + cs; + switch (addr) { + case 0x60: /* GPMC_CONFIG1 */ + f->config[0] = value & 0xffef3e13; + break; + case 0x64: /* GPMC_CONFIG2 */ + f->config[1] = value & 0x001f1f8f; + break; + case 0x68: /* GPMC_CONFIG3 */ + f->config[2] = value & 0x001f1f8f; + break; + case 0x6c: /* GPMC_CONFIG4 */ + f->config[3] = value & 0x1f8f1f8f; + break; + case 0x70: /* GPMC_CONFIG5 */ + f->config[4] = value & 0x0f1f1f1f; + break; + case 0x74: /* GPMC_CONFIG6 */ + f->config[5] = value & 0x00000fcf; + break; + case 0x78: /* GPMC_CONFIG7 */ + if ((f->config[6] ^ value) & 0xf7f) { + omap_gpmc_cs_unmap(s, cs); + f->config[6] = value & 0x00000f7f; + omap_gpmc_cs_map(s, cs); + } + break; + case 0x7c ... 0x7f: /* GPMC_NAND_COMMAND */ + if (omap_gpmc_devtype(f) == OMAP_GPMC_NAND) { + nand_setpins(f->dev, 1, 0, 0, 1, 0); /* CLE */ + omap_nand_setio(f->dev, value, omap_gpmc_devsize(f), size); + } + break; + case 0x80 ... 0x83: /* GPMC_NAND_ADDRESS */ + if (omap_gpmc_devtype(f) == OMAP_GPMC_NAND) { + nand_setpins(f->dev, 0, 1, 0, 1, 0); /* ALE */ + omap_nand_setio(f->dev, value, omap_gpmc_devsize(f), size); + } + break; + case 0x84 ... 0x87: /* GPMC_NAND_DATA */ + if (omap_gpmc_devtype(f) == OMAP_GPMC_NAND) { + omap_nand_write(f, 0, value, size); + } + break; + default: + goto bad_reg; + } + break; + + case 0x1e0: /* GPMC_PREFETCH_CONFIG1 */ + if (!s->prefetch.startengine) { + uint32_t newconfig1 = value & 0x7f8f7fbf; + uint32_t changed; + changed = newconfig1 ^ s->prefetch.config1; + if (changed & (0x80 | 0x7000000)) { + /* Turning the engine on or off, or mapping it somewhere else. + * cs_map() and cs_unmap() check the prefetch config and + * overall CSVALID bits, so it is sufficient to unmap-and-map + * both the old cs and the new one. Note that we adhere to + * the "unmap/change config/map" order (and not unmap twice + * if newcs == oldcs), otherwise we'll try to delete the wrong + * memory region. + */ + int oldcs = prefetch_cs(s->prefetch.config1); + int newcs = prefetch_cs(newconfig1); + omap_gpmc_cs_unmap(s, oldcs); + if (oldcs != newcs) { + omap_gpmc_cs_unmap(s, newcs); + } + s->prefetch.config1 = newconfig1; + omap_gpmc_cs_map(s, oldcs); + if (oldcs != newcs) { + omap_gpmc_cs_map(s, newcs); + } + } else { + s->prefetch.config1 = newconfig1; + } + } + break; + + case 0x1e4: /* GPMC_PREFETCH_CONFIG2 */ + if (!s->prefetch.startengine) { + s->prefetch.transfercount = value & 0x3fff; + } + break; + + case 0x1ec: /* GPMC_PREFETCH_CONTROL */ + if (s->prefetch.startengine != (value & 1)) { + s->prefetch.startengine = value & 1; + if (s->prefetch.startengine) { + /* Prefetch engine start */ + s->prefetch.count = s->prefetch.transfercount; + if (s->prefetch.config1 & 1) { + /* Write */ + s->prefetch.fifopointer = 64; + } else { + /* Read */ + s->prefetch.fifopointer = 0; + fill_prefetch_fifo(s); + } + } else { + /* Prefetch engine forcibly stopped. The TRM + * doesn't define the behaviour if you do this. + * We clear the prefetch count, which means that + * we permit no more writes, and don't read any + * more data from NAND. The CPU can still drain + * the FIFO of unread data. + */ + s->prefetch.count = 0; + } + omap_gpmc_int_update(s); + } + break; + + case 0x1f4: /* GPMC_ECC_CONFIG */ + s->ecc_cs = 0x8f; + break; + case 0x1f8: /* GPMC_ECC_CONTROL */ + if (value & (1 << 8)) + for (cs = 0; cs < 9; cs ++) + ecc_reset(&s->ecc[cs]); + s->ecc_ptr = value & 0xf; + if (s->ecc_ptr == 0 || s->ecc_ptr > 9) { + s->ecc_ptr = 0; + s->ecc_cs &= ~1; + } + break; + case 0x1fc: /* GPMC_ECC_SIZE_CONFIG */ + s->ecc_cfg = value & 0x3fcff1ff; + break; + case 0x230: /* GPMC_TESTMODE_CTRL */ + if (value & 7) + fprintf(stderr, "%s: test mode enable attempt\n", __FUNCTION__); + break; + + default: + bad_reg: + OMAP_BAD_REG(addr); + return; + } +} + +static const MemoryRegionOps omap_gpmc_ops = { + .read = omap_gpmc_read, + .write = omap_gpmc_write, + .endianness = DEVICE_NATIVE_ENDIAN, +}; + +struct omap_gpmc_s *omap_gpmc_init(struct omap_mpu_state_s *mpu, + hwaddr base, + qemu_irq irq, qemu_irq drq) +{ + int cs; + struct omap_gpmc_s *s = g_new0(struct omap_gpmc_s, 1); + + memory_region_init_io(&s->iomem, NULL, &omap_gpmc_ops, s, "omap-gpmc", 0x1000); + memory_region_add_subregion(get_system_memory(), base, &s->iomem); + + s->irq = irq; + s->drq = drq; + s->accept_256 = cpu_is_omap3630(mpu); + s->revision = cpu_class_omap3(mpu) ? 0x50 : 0x20; + s->lastirq = 0; + omap_gpmc_reset(s); + + /* We have to register a different IO memory handler for each + * chip select region in case a NAND device is mapped there. We + * make the region the worst-case size of 256MB and rely on the + * container memory region in cs_map to chop it down to the actual + * guest-requested size. + */ + for (cs = 0; cs < 8; cs++) { + memory_region_init_io(&s->cs_file[cs].nandiomem, NULL, + &omap_nand_ops, + &s->cs_file[cs], + "omap-nand", + 256 * 1024 * 1024); + } + + memory_region_init_io(&s->prefetch.iomem, NULL, &omap_prefetch_ops, s, + "omap-gpmc-prefetch", 256 * 1024 * 1024); + return s; +} + +void omap_gpmc_attach(struct omap_gpmc_s *s, int cs, MemoryRegion *iomem) +{ + struct omap_gpmc_cs_file_s *f; + assert(iomem); + + if (cs < 0 || cs >= 8) { + fprintf(stderr, "%s: bad chip-select %i\n", __FUNCTION__, cs); + exit(-1); + } + f = &s->cs_file[cs]; + + omap_gpmc_cs_unmap(s, cs); + f->config[0] &= ~(0xf << 10); + f->iomem = iomem; + omap_gpmc_cs_map(s, cs); +} + +void omap_gpmc_attach_nand(struct omap_gpmc_s *s, int cs, DeviceState *nand) +{ + struct omap_gpmc_cs_file_s *f; + assert(nand); + + if (cs < 0 || cs >= 8) { + fprintf(stderr, "%s: bad chip-select %i\n", __func__, cs); + exit(-1); + } + f = &s->cs_file[cs]; + + omap_gpmc_cs_unmap(s, cs); + f->config[0] &= ~(0xf << 10); + f->config[0] |= (OMAP_GPMC_NAND << 10); + f->dev = nand; + if (nand_getbuswidth(f->dev) == 16) { + f->config[0] |= OMAP_GPMC_16BIT << 12; + } + omap_gpmc_cs_map(s, cs); +} |
