diff options
Diffstat (limited to 'qemu/roms/u-boot/drivers/mtd/spi/sandbox.c')
| -rw-r--r-- | qemu/roms/u-boot/drivers/mtd/spi/sandbox.c | 483 |
1 files changed, 483 insertions, 0 deletions
diff --git a/qemu/roms/u-boot/drivers/mtd/spi/sandbox.c b/qemu/roms/u-boot/drivers/mtd/spi/sandbox.c new file mode 100644 index 000000000..a62ef4cbb --- /dev/null +++ b/qemu/roms/u-boot/drivers/mtd/spi/sandbox.c @@ -0,0 +1,483 @@ +/* + * Simulate a SPI flash + * + * Copyright (c) 2011-2013 The Chromium OS Authors. + * See file CREDITS for list of people who contributed to this + * project. + * + * Licensed under the GPL-2 or later. + */ + +#include <common.h> +#include <malloc.h> +#include <spi.h> +#include <os.h> + +#include <spi_flash.h> +#include "sf_internal.h" + +#include <asm/getopt.h> +#include <asm/spi.h> +#include <asm/state.h> + +/* + * The different states that our SPI flash transitions between. + * We need to keep track of this across multiple xfer calls since + * the SPI bus could possibly call down into us multiple times. + */ +enum sandbox_sf_state { + SF_CMD, /* default state -- we're awaiting a command */ + SF_ID, /* read the flash's (jedec) ID code */ + SF_ADDR, /* processing the offset in the flash to read/etc... */ + SF_READ, /* reading data from the flash */ + SF_WRITE, /* writing data to the flash, i.e. page programming */ + SF_ERASE, /* erase the flash */ + SF_READ_STATUS, /* read the flash's status register */ + SF_READ_STATUS1, /* read the flash's status register upper 8 bits*/ +}; + +static const char *sandbox_sf_state_name(enum sandbox_sf_state state) +{ + static const char * const states[] = { + "CMD", "ID", "ADDR", "READ", "WRITE", "ERASE", "READ_STATUS", + }; + return states[state]; +} + +/* Bits for the status register */ +#define STAT_WIP (1 << 0) +#define STAT_WEL (1 << 1) + +/* Assume all SPI flashes have 3 byte addresses since they do atm */ +#define SF_ADDR_LEN 3 + +struct sandbox_spi_flash_erase_commands { + u8 cmd; + u32 size; +}; +#define IDCODE_LEN 5 +#define MAX_ERASE_CMDS 3 +struct sandbox_spi_flash_data { + const char *name; + u8 idcode[IDCODE_LEN]; + u32 size; + const struct sandbox_spi_flash_erase_commands + erase_cmds[MAX_ERASE_CMDS]; +}; + +/* Structure describing all the flashes we know how to emulate */ +static const struct sandbox_spi_flash_data sandbox_sf_flashes[] = { + { + "M25P16", { 0x20, 0x20, 0x15 }, (2 << 20), + { /* erase commands */ + { 0xd8, (64 << 10), }, /* sector */ + { 0xc7, (2 << 20), }, /* bulk */ + }, + }, + { + "W25Q32", { 0xef, 0x40, 0x16 }, (4 << 20), + { /* erase commands */ + { 0x20, (4 << 10), }, /* 4KB */ + { 0xd8, (64 << 10), }, /* sector */ + { 0xc7, (4 << 20), }, /* bulk */ + }, + }, + { + "W25Q128", { 0xef, 0x40, 0x18 }, (16 << 20), + { /* erase commands */ + { 0x20, (4 << 10), }, /* 4KB */ + { 0xd8, (64 << 10), }, /* sector */ + { 0xc7, (16 << 20), }, /* bulk */ + }, + }, +}; + +/* Used to quickly bulk erase backing store */ +static u8 sandbox_sf_0xff[0x1000]; + +/* Internal state data for each SPI flash */ +struct sandbox_spi_flash { + /* + * As we receive data over the SPI bus, our flash transitions + * between states. For example, we start off in the SF_CMD + * state where the first byte tells us what operation to perform + * (such as read or write the flash). But the operation itself + * can go through a few states such as first reading in the + * offset in the flash to perform the requested operation. + * Thus "state" stores the exact state that our machine is in + * while "cmd" stores the overall command we're processing. + */ + enum sandbox_sf_state state; + uint cmd; + const void *cmd_data; + /* Current position in the flash; used when reading/writing/etc... */ + uint off; + /* How many address bytes we've consumed */ + uint addr_bytes, pad_addr_bytes; + /* The current flash status (see STAT_XXX defines above) */ + u16 status; + /* Data describing the flash we're emulating */ + const struct sandbox_spi_flash_data *data; + /* The file on disk to serv up data from */ + int fd; +}; + +static int sandbox_sf_setup(void **priv, const char *spec) +{ + /* spec = idcode:file */ + struct sandbox_spi_flash *sbsf; + const char *file; + size_t i, len, idname_len; + const struct sandbox_spi_flash_data *data; + + file = strchr(spec, ':'); + if (!file) { + printf("sandbox_sf: unable to parse file\n"); + goto error; + } + idname_len = file - spec; + ++file; + + for (i = 0; i < ARRAY_SIZE(sandbox_sf_flashes); ++i) { + data = &sandbox_sf_flashes[i]; + len = strlen(data->name); + if (idname_len != len) + continue; + if (!memcmp(spec, data->name, len)) + break; + } + if (i == ARRAY_SIZE(sandbox_sf_flashes)) { + printf("sandbox_sf: unknown flash '%*s'\n", (int)idname_len, + spec); + goto error; + } + + if (sandbox_sf_0xff[0] == 0x00) + memset(sandbox_sf_0xff, 0xff, sizeof(sandbox_sf_0xff)); + + sbsf = calloc(sizeof(*sbsf), 1); + if (!sbsf) { + printf("sandbox_sf: out of memory\n"); + goto error; + } + + sbsf->fd = os_open(file, 02); + if (sbsf->fd == -1) { + free(sbsf); + printf("sandbox_sf: unable to open file '%s'\n", file); + goto error; + } + + sbsf->data = data; + + *priv = sbsf; + return 0; + + error: + return 1; +} + +static void sandbox_sf_free(void *priv) +{ + struct sandbox_spi_flash *sbsf = priv; + + os_close(sbsf->fd); + free(sbsf); +} + +static void sandbox_sf_cs_activate(void *priv) +{ + struct sandbox_spi_flash *sbsf = priv; + + debug("sandbox_sf: CS activated; state is fresh!\n"); + + /* CS is asserted, so reset state */ + sbsf->off = 0; + sbsf->addr_bytes = 0; + sbsf->pad_addr_bytes = 0; + sbsf->state = SF_CMD; + sbsf->cmd = SF_CMD; +} + +static void sandbox_sf_cs_deactivate(void *priv) +{ + debug("sandbox_sf: CS deactivated; cmd done processing!\n"); +} + +/* Figure out what command this stream is telling us to do */ +static int sandbox_sf_process_cmd(struct sandbox_spi_flash *sbsf, const u8 *rx, + u8 *tx) +{ + enum sandbox_sf_state oldstate = sbsf->state; + + /* We need to output a byte for the cmd byte we just ate */ + sandbox_spi_tristate(tx, 1); + + sbsf->cmd = rx[0]; + switch (sbsf->cmd) { + case CMD_READ_ID: + sbsf->state = SF_ID; + sbsf->cmd = SF_ID; + break; + case CMD_READ_ARRAY_FAST: + sbsf->pad_addr_bytes = 1; + case CMD_READ_ARRAY_SLOW: + case CMD_PAGE_PROGRAM: + state_addr: + sbsf->state = SF_ADDR; + break; + case CMD_WRITE_DISABLE: + debug(" write disabled\n"); + sbsf->status &= ~STAT_WEL; + break; + case CMD_READ_STATUS: + sbsf->state = SF_READ_STATUS; + break; + case CMD_READ_STATUS1: + sbsf->state = SF_READ_STATUS1; + break; + case CMD_WRITE_ENABLE: + debug(" write enabled\n"); + sbsf->status |= STAT_WEL; + break; + default: { + size_t i; + + /* handle erase commands first */ + for (i = 0; i < MAX_ERASE_CMDS; ++i) { + const struct sandbox_spi_flash_erase_commands * + erase_cmd = &sbsf->data->erase_cmds[i]; + + if (erase_cmd->cmd == 0x00) + continue; + if (sbsf->cmd != erase_cmd->cmd) + continue; + + sbsf->cmd_data = erase_cmd; + goto state_addr; + } + + debug(" cmd unknown: %#x\n", sbsf->cmd); + return 1; + } + } + + if (oldstate != sbsf->state) + debug(" cmd: transition to %s state\n", + sandbox_sf_state_name(sbsf->state)); + + return 0; +} + +int sandbox_erase_part(struct sandbox_spi_flash *sbsf, int size) +{ + int todo; + int ret; + + while (size > 0) { + todo = min(size, sizeof(sandbox_sf_0xff)); + ret = os_write(sbsf->fd, sandbox_sf_0xff, todo); + if (ret != todo) + return ret; + size -= todo; + } + + return 0; +} + +static int sandbox_sf_xfer(void *priv, const u8 *rx, u8 *tx, + uint bytes) +{ + struct sandbox_spi_flash *sbsf = priv; + uint cnt, pos = 0; + int ret; + + debug("sandbox_sf: state:%x(%s) bytes:%u\n", sbsf->state, + sandbox_sf_state_name(sbsf->state), bytes); + + if (sbsf->state == SF_CMD) { + /* Figure out the initial state */ + if (sandbox_sf_process_cmd(sbsf, rx, tx)) + return 1; + ++pos; + } + + /* Process the remaining data */ + while (pos < bytes) { + switch (sbsf->state) { + case SF_ID: { + u8 id; + + debug(" id: off:%u tx:", sbsf->off); + if (sbsf->off < IDCODE_LEN) + id = sbsf->data->idcode[sbsf->off]; + else + id = 0; + debug("%02x\n", id); + tx[pos++] = id; + ++sbsf->off; + break; + } + case SF_ADDR: + debug(" addr: bytes:%u rx:%02x ", sbsf->addr_bytes, + rx[pos]); + + if (sbsf->addr_bytes++ < SF_ADDR_LEN) + sbsf->off = (sbsf->off << 8) | rx[pos]; + debug("addr:%06x\n", sbsf->off); + + sandbox_spi_tristate(&tx[pos++], 1); + + /* See if we're done processing */ + if (sbsf->addr_bytes < + SF_ADDR_LEN + sbsf->pad_addr_bytes) + break; + + /* Next state! */ + if (os_lseek(sbsf->fd, sbsf->off, OS_SEEK_SET) < 0) { + puts("sandbox_sf: os_lseek() failed"); + return 1; + } + switch (sbsf->cmd) { + case CMD_READ_ARRAY_FAST: + case CMD_READ_ARRAY_SLOW: + sbsf->state = SF_READ; + break; + case CMD_PAGE_PROGRAM: + sbsf->state = SF_WRITE; + break; + default: + /* assume erase state ... */ + sbsf->state = SF_ERASE; + goto case_sf_erase; + } + debug(" cmd: transition to %s state\n", + sandbox_sf_state_name(sbsf->state)); + break; + case SF_READ: + /* + * XXX: need to handle exotic behavior: + * - reading past end of device + */ + + cnt = bytes - pos; + debug(" tx: read(%u)\n", cnt); + ret = os_read(sbsf->fd, tx + pos, cnt); + if (ret < 0) { + puts("sandbox_spi: os_read() failed\n"); + return 1; + } + pos += ret; + break; + case SF_READ_STATUS: + debug(" read status: %#x\n", sbsf->status); + cnt = bytes - pos; + memset(tx + pos, sbsf->status, cnt); + pos += cnt; + break; + case SF_READ_STATUS1: + debug(" read status: %#x\n", sbsf->status); + cnt = bytes - pos; + memset(tx + pos, sbsf->status >> 8, cnt); + pos += cnt; + break; + case SF_WRITE: + /* + * XXX: need to handle exotic behavior: + * - unaligned addresses + * - more than a page (256) worth of data + * - reading past end of device + */ + if (!(sbsf->status & STAT_WEL)) { + puts("sandbox_sf: write enable not set before write\n"); + goto done; + } + + cnt = bytes - pos; + debug(" rx: write(%u)\n", cnt); + sandbox_spi_tristate(&tx[pos], cnt); + ret = os_write(sbsf->fd, rx + pos, cnt); + if (ret < 0) { + puts("sandbox_spi: os_write() failed\n"); + return 1; + } + pos += ret; + sbsf->status &= ~STAT_WEL; + break; + case SF_ERASE: + case_sf_erase: { + const struct sandbox_spi_flash_erase_commands * + erase_cmd = sbsf->cmd_data; + + if (!(sbsf->status & STAT_WEL)) { + puts("sandbox_sf: write enable not set before erase\n"); + goto done; + } + + /* verify address is aligned */ + if (sbsf->off & (erase_cmd->size - 1)) { + debug(" sector erase: cmd:%#x needs align:%#x, but we got %#x\n", + erase_cmd->cmd, erase_cmd->size, + sbsf->off); + sbsf->status &= ~STAT_WEL; + goto done; + } + + debug(" sector erase addr: %u\n", sbsf->off); + + cnt = bytes - pos; + sandbox_spi_tristate(&tx[pos], cnt); + pos += cnt; + + /* + * TODO(vapier@gentoo.org): latch WIP in status, and + * delay before clearing it ? + */ + ret = sandbox_erase_part(sbsf, erase_cmd->size); + sbsf->status &= ~STAT_WEL; + if (ret) { + debug("sandbox_sf: Erase failed\n"); + goto done; + } + goto done; + } + default: + debug(" ??? no idea what to do ???\n"); + goto done; + } + } + + done: + return pos == bytes ? 0 : 1; +} + +static const struct sandbox_spi_emu_ops sandbox_sf_ops = { + .setup = sandbox_sf_setup, + .free = sandbox_sf_free, + .cs_activate = sandbox_sf_cs_activate, + .cs_deactivate = sandbox_sf_cs_deactivate, + .xfer = sandbox_sf_xfer, +}; + +static int sandbox_cmdline_cb_spi_sf(struct sandbox_state *state, + const char *arg) +{ + unsigned long bus, cs; + const char *spec = sandbox_spi_parse_spec(arg, &bus, &cs); + + if (!spec) + return 1; + + /* + * It is safe to not make a copy of 'spec' because it comes from the + * command line. + * + * TODO(sjg@chromium.org): It would be nice if we could parse the + * spec here, but the problem is that no U-Boot init has been done + * yet. Perhaps we can figure something out. + */ + state->spi[bus][cs].ops = &sandbox_sf_ops; + state->spi[bus][cs].spec = spec; + return 0; +} +SANDBOX_CMDLINE_OPT(spi_sf, 1, "connect a SPI flash: <bus>:<cs>:<id>:<file>"); |