| /* |
| * This file is part of the coreboot project. |
| * |
| * 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 of the License, or |
| * (at your option) any later version. |
| * |
| * 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. |
| */ |
| |
| #include <assert.h> |
| #include <boot_device.h> |
| #include <boot/coreboot_tables.h> |
| #include <console/console.h> |
| #include <cpu/x86/smm.h> |
| #include <string.h> |
| #include <spi-generic.h> |
| #include <spi_flash.h> |
| #include <timer.h> |
| #include <types.h> |
| |
| #include "spi_flash_internal.h" |
| |
| static void spi_flash_addr(u32 addr, u8 *cmd) |
| { |
| /* cmd[0] is actual command */ |
| cmd[1] = addr >> 16; |
| cmd[2] = addr >> 8; |
| cmd[3] = addr >> 0; |
| } |
| |
| static int do_spi_flash_cmd(const struct spi_slave *spi, const void *dout, |
| size_t bytes_out, void *din, size_t bytes_in) |
| { |
| int ret; |
| /* |
| * SPI flash requires command-response kind of behavior. Thus, two |
| * separate SPI vectors are required -- first to transmit dout and other |
| * to receive in din. If some specialized SPI flash controllers |
| * (e.g. x86) can perform both command and response together, it should |
| * be handled at SPI flash controller driver level. |
| */ |
| struct spi_op vectors[] = { |
| [0] = { .dout = dout, .bytesout = bytes_out, |
| .din = NULL, .bytesin = 0, }, |
| [1] = { .dout = NULL, .bytesout = 0, |
| .din = din, .bytesin = bytes_in }, |
| }; |
| size_t count = ARRAY_SIZE(vectors); |
| if (!bytes_in) |
| count = 1; |
| |
| ret = spi_claim_bus(spi); |
| if (ret) |
| return ret; |
| |
| ret = spi_xfer_vector(spi, vectors, count); |
| |
| spi_release_bus(spi); |
| return ret; |
| } |
| |
| static int do_dual_read_cmd(const struct spi_slave *spi, const void *dout, |
| size_t bytes_out, void *din, size_t bytes_in) |
| { |
| int ret; |
| |
| /* |
| * spi_xfer_vector() will automatically fall back to .xfer() if |
| * .xfer_vector() is unimplemented. So using vector API here is more |
| * flexible, even though a controller that implements .xfer_vector() |
| * and (the non-vector based) .xfer_dual() but not .xfer() would be |
| * pretty odd. |
| */ |
| struct spi_op vector = { .dout = dout, .bytesout = bytes_out, |
| .din = NULL, .bytesin = 0 }; |
| |
| ret = spi_claim_bus(spi); |
| if (ret) |
| return ret; |
| |
| ret = spi_xfer_vector(spi, &vector, 1); |
| |
| if (!ret) |
| ret = spi->ctrlr->xfer_dual(spi, NULL, 0, din, bytes_in); |
| |
| spi_release_bus(spi); |
| return ret; |
| } |
| |
| int spi_flash_cmd(const struct spi_slave *spi, u8 cmd, void *response, size_t len) |
| { |
| int ret = do_spi_flash_cmd(spi, &cmd, sizeof(cmd), response, len); |
| if (ret) |
| printk(BIOS_WARNING, "SF: Failed to send command %02x: %d\n", cmd, ret); |
| |
| return ret; |
| } |
| |
| /* TODO: This code is quite possibly broken and overflowing stacks. Fix ASAP! */ |
| #pragma GCC diagnostic push |
| #if defined(__GNUC__) && !defined(__clang__) |
| #pragma GCC diagnostic ignored "-Wstack-usage=" |
| #endif |
| #pragma GCC diagnostic ignored "-Wvla" |
| int spi_flash_cmd_write(const struct spi_slave *spi, const u8 *cmd, |
| size_t cmd_len, const void *data, size_t data_len) |
| { |
| int ret; |
| u8 buff[cmd_len + data_len]; |
| memcpy(buff, cmd, cmd_len); |
| memcpy(buff + cmd_len, data, data_len); |
| |
| ret = do_spi_flash_cmd(spi, buff, cmd_len + data_len, NULL, 0); |
| if (ret) { |
| printk(BIOS_WARNING, "SF: Failed to send write command (%zu bytes): %d\n", |
| data_len, ret); |
| } |
| |
| return ret; |
| } |
| #pragma GCC diagnostic pop |
| |
| /* Perform the read operation honoring spi controller fifo size, reissuing |
| * the read command until the full request completed. */ |
| static int spi_flash_read_chunked(const struct spi_flash *flash, u32 offset, |
| size_t len, void *buf) |
| { |
| u8 cmd[5]; |
| int ret, cmd_len; |
| int (*do_cmd)(const struct spi_slave *spi, const void *din, |
| size_t in_bytes, void *out, size_t out_bytes); |
| |
| if (CONFIG(SPI_FLASH_NO_FAST_READ)) { |
| cmd_len = 4; |
| cmd[0] = CMD_READ_ARRAY_SLOW; |
| do_cmd = do_spi_flash_cmd; |
| } else if (flash->flags.dual_spi && flash->spi.ctrlr->xfer_dual) { |
| cmd_len = 5; |
| cmd[0] = CMD_READ_FAST_DUAL_OUTPUT; |
| cmd[4] = 0; |
| do_cmd = do_dual_read_cmd; |
| } else { |
| cmd_len = 5; |
| cmd[0] = CMD_READ_ARRAY_FAST; |
| cmd[4] = 0; |
| do_cmd = do_spi_flash_cmd; |
| } |
| |
| uint8_t *data = buf; |
| while (len) { |
| size_t xfer_len = spi_crop_chunk(&flash->spi, cmd_len, len); |
| spi_flash_addr(offset, cmd); |
| ret = do_cmd(&flash->spi, cmd, cmd_len, data, xfer_len); |
| if (ret) { |
| printk(BIOS_WARNING, |
| "SF: Failed to send read command %#.2x(%#x, %#zx): %d\n", |
| cmd[0], offset, xfer_len, ret); |
| return ret; |
| } |
| offset += xfer_len; |
| data += xfer_len; |
| len -= xfer_len; |
| } |
| |
| return 0; |
| } |
| |
| int spi_flash_cmd_poll_bit(const struct spi_flash *flash, unsigned long timeout, |
| u8 cmd, u8 poll_bit) |
| { |
| const struct spi_slave *spi = &flash->spi; |
| int ret; |
| u8 status; |
| struct mono_time current, end; |
| |
| timer_monotonic_get(¤t); |
| end = current; |
| mono_time_add_msecs(&end, timeout); |
| |
| do { |
| ret = do_spi_flash_cmd(spi, &cmd, 1, &status, 1); |
| if (ret) |
| return -1; |
| if ((status & poll_bit) == 0) |
| return 0; |
| timer_monotonic_get(¤t); |
| } while (!mono_time_after(¤t, &end)); |
| |
| printk(BIOS_DEBUG, "SF: timeout at %ld msec\n",timeout); |
| return -1; |
| } |
| |
| int spi_flash_cmd_wait_ready(const struct spi_flash *flash, |
| unsigned long timeout) |
| { |
| return spi_flash_cmd_poll_bit(flash, timeout, |
| CMD_READ_STATUS, STATUS_WIP); |
| } |
| |
| int spi_flash_cmd_erase(const struct spi_flash *flash, u32 offset, size_t len) |
| { |
| u32 start, end, erase_size; |
| int ret = -1; |
| u8 cmd[4]; |
| |
| erase_size = flash->sector_size; |
| if (offset % erase_size || len % erase_size) { |
| printk(BIOS_WARNING, "SF: Erase offset/length not multiple of erase size\n"); |
| return -1; |
| } |
| if (len == 0) { |
| printk(BIOS_WARNING, "SF: Erase length cannot be 0\n"); |
| return -1; |
| } |
| |
| cmd[0] = flash->erase_cmd; |
| start = offset; |
| end = start + len; |
| |
| while (offset < end) { |
| spi_flash_addr(offset, cmd); |
| offset += erase_size; |
| |
| #if CONFIG(DEBUG_SPI_FLASH) |
| printk(BIOS_SPEW, "SF: erase %2x %2x %2x %2x (%x)\n", cmd[0], cmd[1], |
| cmd[2], cmd[3], offset); |
| #endif |
| ret = spi_flash_cmd(&flash->spi, CMD_WRITE_ENABLE, NULL, 0); |
| if (ret) |
| goto out; |
| |
| ret = spi_flash_cmd_write(&flash->spi, cmd, sizeof(cmd), NULL, 0); |
| if (ret) |
| goto out; |
| |
| ret = spi_flash_cmd_wait_ready(flash, |
| SPI_FLASH_PAGE_ERASE_TIMEOUT_MS); |
| if (ret) |
| goto out; |
| } |
| |
| printk(BIOS_DEBUG, "SF: Successfully erased %zu bytes @ %#x\n", len, start); |
| |
| out: |
| return ret; |
| } |
| |
| int spi_flash_cmd_status(const struct spi_flash *flash, u8 *reg) |
| { |
| return spi_flash_cmd(&flash->spi, flash->status_cmd, reg, sizeof(*reg)); |
| } |
| |
| int spi_flash_cmd_write_page_program(const struct spi_flash *flash, u32 offset, |
| size_t len, const void *buf) |
| { |
| unsigned long byte_addr; |
| unsigned long page_size; |
| size_t chunk_len; |
| size_t actual; |
| int ret = 0; |
| u8 cmd[4]; |
| |
| page_size = flash->page_size; |
| cmd[0] = flash->pp_cmd; |
| |
| for (actual = 0; actual < len; actual += chunk_len) { |
| byte_addr = offset % page_size; |
| chunk_len = MIN(len - actual, page_size - byte_addr); |
| chunk_len = spi_crop_chunk(&flash->spi, sizeof(cmd), chunk_len); |
| |
| spi_flash_addr(offset, cmd); |
| if (CONFIG(DEBUG_SPI_FLASH)) { |
| printk(BIOS_SPEW, "PP: %p => cmd = { 0x%02x 0x%02x%02x%02x } chunk_len = %zu\n", |
| buf + actual, cmd[0], cmd[1], cmd[2], cmd[3], |
| chunk_len); |
| } |
| |
| ret = spi_flash_cmd(&flash->spi, flash->wren_cmd, NULL, 0); |
| if (ret < 0) { |
| printk(BIOS_WARNING, "SF: Enabling Write failed\n"); |
| goto out; |
| } |
| |
| ret = spi_flash_cmd_write(&flash->spi, cmd, sizeof(cmd), |
| buf + actual, chunk_len); |
| if (ret < 0) { |
| printk(BIOS_WARNING, "SF: Page Program failed\n"); |
| goto out; |
| } |
| |
| ret = spi_flash_cmd_wait_ready(flash, SPI_FLASH_PROG_TIMEOUT_MS); |
| if (ret) |
| goto out; |
| |
| offset += chunk_len; |
| } |
| |
| if (CONFIG(DEBUG_SPI_FLASH)) |
| printk(BIOS_SPEW, "SF: : Successfully programmed %zu bytes @ 0x%lx\n", |
| len, (unsigned long)(offset - len)); |
| ret = 0; |
| |
| out: |
| return ret; |
| } |
| |
| /* |
| * The following table holds all device probe functions |
| * |
| * shift: number of continuation bytes before the ID |
| * idcode: the expected IDCODE or 0xff for non JEDEC devices |
| * probe: the function to call |
| * |
| * Non JEDEC devices should be ordered in the table such that |
| * the probe functions with best detection algorithms come first. |
| * |
| * Several matching entries are permitted, they will be tried |
| * in sequence until a probe function returns non NULL. |
| * |
| * IDCODE_CONT_LEN may be redefined if a device needs to declare a |
| * larger "shift" value. IDCODE_PART_LEN generally shouldn't be |
| * changed. This is the max number of bytes probe functions may |
| * examine when looking up part-specific identification info. |
| * |
| * Probe functions will be given the idcode buffer starting at their |
| * manu id byte (the "idcode" in the table below). In other words, |
| * all of the continuation bytes will be skipped (the "shift" below). |
| */ |
| #define IDCODE_CONT_LEN 0 |
| #define IDCODE_PART_LEN 5 |
| static struct { |
| const u8 shift; |
| const u8 idcode; |
| int (*probe) (const struct spi_slave *spi, u8 *idcode, |
| struct spi_flash *flash); |
| } flashes[] = { |
| /* Keep it sorted by define name */ |
| #if CONFIG(SPI_FLASH_AMIC) |
| { 0, VENDOR_ID_AMIC, spi_flash_probe_amic, }, |
| #endif |
| #if CONFIG(SPI_FLASH_ATMEL) |
| { 0, VENDOR_ID_ATMEL, spi_flash_probe_atmel, }, |
| #endif |
| #if CONFIG(SPI_FLASH_EON) |
| { 0, VENDOR_ID_EON, spi_flash_probe_eon, }, |
| #endif |
| #if CONFIG(SPI_FLASH_GIGADEVICE) |
| { 0, VENDOR_ID_GIGADEVICE, spi_flash_probe_gigadevice, }, |
| #endif |
| #if CONFIG(SPI_FLASH_MACRONIX) |
| { 0, VENDOR_ID_MACRONIX, spi_flash_probe_macronix, }, |
| #endif |
| #if CONFIG(SPI_FLASH_SPANSION) |
| { 0, VENDOR_ID_SPANSION, spi_flash_probe_spansion, }, |
| #endif |
| #if CONFIG(SPI_FLASH_SST) |
| { 0, VENDOR_ID_SST, spi_flash_probe_sst, }, |
| #endif |
| #if CONFIG(SPI_FLASH_STMICRO) |
| { 0, VENDOR_ID_STMICRO, spi_flash_probe_stmicro, }, |
| #endif |
| #if CONFIG(SPI_FLASH_WINBOND) |
| { 0, VENDOR_ID_WINBOND, spi_flash_probe_winbond, }, |
| #endif |
| /* Keep it sorted by best detection */ |
| #if CONFIG(SPI_FLASH_ADESTO) |
| { 0, VENDOR_ID_ADESTO, spi_flash_probe_adesto, }, |
| #endif |
| }; |
| #define IDCODE_LEN (IDCODE_CONT_LEN + IDCODE_PART_LEN) |
| |
| int spi_flash_generic_probe(const struct spi_slave *spi, |
| struct spi_flash *flash) |
| { |
| int ret, i, shift; |
| u8 idcode[IDCODE_LEN], *idp; |
| |
| /* Read the ID codes */ |
| ret = spi_flash_cmd(spi, CMD_READ_ID, idcode, sizeof(idcode)); |
| if (ret) |
| return -1; |
| |
| if (CONFIG(DEBUG_SPI_FLASH)) { |
| printk(BIOS_SPEW, "SF: Got idcode: "); |
| for (i = 0; i < sizeof(idcode); i++) |
| printk(BIOS_SPEW, "%02x ", idcode[i]); |
| printk(BIOS_SPEW, "\n"); |
| } |
| |
| /* count the number of continuation bytes */ |
| for (shift = 0, idp = idcode; shift < IDCODE_CONT_LEN && *idp == 0x7f; |
| ++shift, ++idp) |
| continue; |
| |
| printk(BIOS_INFO, "Manufacturer: %02x\n", *idp); |
| |
| /* If no result from RDID command and STMicro parts are enabled attempt |
| to wake the part from deep sleep and obtain alternative id info. */ |
| if (CONFIG(SPI_FLASH_STMICRO) && *idp == 0xff) { |
| if (stmicro_release_deep_sleep_identify(spi, idcode)) |
| return -1; |
| idp = idcode; |
| shift = 0; |
| } |
| |
| /* search the table for matches in shift and id */ |
| for (i = 0; i < (int)ARRAY_SIZE(flashes); ++i) |
| if (flashes[i].shift == shift && flashes[i].idcode == *idp) { |
| /* we have a match, call probe */ |
| if (flashes[i].probe(spi, idp, flash) == 0) { |
| flash->vendor = idp[0]; |
| flash->model = (idp[1] << 8) | idp[2]; |
| return 0; |
| } |
| } |
| |
| /* No match, return error. */ |
| return -1; |
| } |
| |
| int spi_flash_probe(unsigned int bus, unsigned int cs, struct spi_flash *flash) |
| { |
| struct spi_slave spi; |
| int ret = -1; |
| |
| if (spi_setup_slave(bus, cs, &spi)) { |
| printk(BIOS_WARNING, "SF: Failed to set up slave\n"); |
| return -1; |
| } |
| |
| /* Try special programmer probe if any. */ |
| if (spi.ctrlr->flash_probe) |
| ret = spi.ctrlr->flash_probe(&spi, flash); |
| |
| /* If flash is not found, try generic spi flash probe. */ |
| if (ret) |
| ret = spi_flash_generic_probe(&spi, flash); |
| |
| /* Give up -- nothing more to try if flash is not found. */ |
| if (ret) { |
| printk(BIOS_WARNING, "SF: Unsupported manufacturer!\n"); |
| return -1; |
| } |
| |
| const char *mode_string = ""; |
| if (flash->flags.dual_spi && spi.ctrlr->xfer_dual) |
| mode_string = " (Dual SPI mode)"; |
| printk(BIOS_INFO, |
| "SF: Detected %s with sector size 0x%x, total 0x%x%s\n", |
| flash->name, flash->sector_size, flash->size, mode_string); |
| if (bus == CONFIG_BOOT_DEVICE_SPI_FLASH_BUS |
| && flash->size != CONFIG_ROM_SIZE) { |
| printk(BIOS_ERR, "SF size 0x%x does not correspond to" |
| " CONFIG_ROM_SIZE 0x%x!!\n", flash->size, |
| CONFIG_ROM_SIZE); |
| } |
| return 0; |
| } |
| |
| int spi_flash_read(const struct spi_flash *flash, u32 offset, size_t len, |
| void *buf) |
| { |
| if (flash->ops->read) |
| return flash->ops->read(flash, offset, len, buf); |
| |
| return spi_flash_read_chunked(flash, offset, len, buf); |
| } |
| |
| int spi_flash_write(const struct spi_flash *flash, u32 offset, size_t len, |
| const void *buf) |
| { |
| int ret; |
| |
| if (spi_flash_volatile_group_begin(flash)) |
| return -1; |
| |
| ret = flash->ops->write(flash, offset, len, buf); |
| |
| if (spi_flash_volatile_group_end(flash)) |
| return -1; |
| |
| return ret; |
| } |
| |
| int spi_flash_erase(const struct spi_flash *flash, u32 offset, size_t len) |
| { |
| int ret; |
| |
| if (spi_flash_volatile_group_begin(flash)) |
| return -1; |
| |
| ret = flash->ops->erase(flash, offset, len); |
| |
| if (spi_flash_volatile_group_end(flash)) |
| return -1; |
| |
| return ret; |
| } |
| |
| int spi_flash_status(const struct spi_flash *flash, u8 *reg) |
| { |
| if (flash->ops->status) |
| return flash->ops->status(flash, reg); |
| |
| return -1; |
| } |
| |
| int spi_flash_is_write_protected(const struct spi_flash *flash, |
| const struct region *region) |
| { |
| struct region flash_region = { 0 }; |
| |
| if (!flash || !region) |
| return -1; |
| |
| flash_region.size = flash->size; |
| |
| if (!region_is_subregion(&flash_region, region)) |
| return -1; |
| |
| if (!flash->ops->get_write_protection) { |
| printk(BIOS_WARNING, "SPI: Write-protection gathering not " |
| "implemented for this vendor.\n"); |
| return -1; |
| } |
| |
| return flash->ops->get_write_protection(flash, region); |
| } |
| |
| int spi_flash_set_write_protected(const struct spi_flash *flash, |
| const struct region *region, |
| const bool non_volatile, |
| const enum spi_flash_status_reg_lockdown mode) |
| { |
| struct region flash_region = { 0 }; |
| int ret; |
| |
| if (!flash) |
| return -1; |
| |
| flash_region.size = flash->size; |
| |
| if (!region_is_subregion(&flash_region, region)) |
| return -1; |
| |
| if (!flash->ops->set_write_protection) { |
| printk(BIOS_WARNING, "SPI: Setting write-protection is not " |
| "implemented for this vendor.\n"); |
| return -1; |
| } |
| |
| ret = flash->ops->set_write_protection(flash, region, non_volatile, |
| mode); |
| |
| if (ret == 0 && mode != SPI_WRITE_PROTECTION_PRESERVE) { |
| printk(BIOS_INFO, "SPI: SREG lock-down was set to "); |
| switch (mode) { |
| case SPI_WRITE_PROTECTION_NONE: |
| printk(BIOS_INFO, "NEVER\n"); |
| break; |
| case SPI_WRITE_PROTECTION_PIN: |
| printk(BIOS_INFO, "WP\n"); |
| break; |
| case SPI_WRITE_PROTECTION_REBOOT: |
| printk(BIOS_INFO, "REBOOT\n"); |
| break; |
| case SPI_WRITE_PROTECTION_PERMANENT: |
| printk(BIOS_INFO, "PERMANENT\n"); |
| break; |
| default: |
| printk(BIOS_INFO, "UNKNOWN\n"); |
| break; |
| } |
| } |
| |
| return ret; |
| } |
| |
| static uint32_t volatile_group_count; |
| |
| int spi_flash_volatile_group_begin(const struct spi_flash *flash) |
| { |
| uint32_t count; |
| int ret = 0; |
| |
| if (!CONFIG(SPI_FLASH_HAS_VOLATILE_GROUP)) |
| return ret; |
| |
| count = volatile_group_count; |
| if (count == 0) |
| ret = chipset_volatile_group_begin(flash); |
| |
| count++; |
| volatile_group_count = count; |
| return ret; |
| } |
| |
| int spi_flash_volatile_group_end(const struct spi_flash *flash) |
| { |
| uint32_t count; |
| int ret = 0; |
| |
| if (!CONFIG(SPI_FLASH_HAS_VOLATILE_GROUP)) |
| return ret; |
| |
| count = volatile_group_count; |
| assert(count == 0); |
| count--; |
| volatile_group_count = count; |
| |
| if (count == 0) |
| ret = chipset_volatile_group_end(flash); |
| |
| return ret; |
| } |
| |
| void lb_spi_flash(struct lb_header *header) |
| { |
| struct lb_spi_flash *flash; |
| const struct spi_flash *spi_flash_dev; |
| |
| if (!CONFIG(BOOT_DEVICE_SPI_FLASH)) |
| return; |
| |
| flash = (struct lb_spi_flash *)lb_new_record(header); |
| |
| flash->tag = LB_TAG_SPI_FLASH; |
| flash->size = sizeof(*flash); |
| |
| spi_flash_dev = boot_device_spi_flash(); |
| |
| if (spi_flash_dev) { |
| flash->flash_size = spi_flash_dev->size; |
| flash->sector_size = spi_flash_dev->sector_size; |
| flash->erase_cmd = spi_flash_dev->erase_cmd; |
| } else { |
| flash->flash_size = CONFIG_ROM_SIZE; |
| /* Default 64k erase command should work on most flash. |
| * Uniform 4k erase only works on certain devices. */ |
| flash->sector_size = 64 * KiB; |
| flash->erase_cmd = CMD_BLOCK_ERASE; |
| } |
| } |
| |
| |
| int spi_flash_ctrlr_protect_region(const struct spi_flash *flash, |
| const struct region *region, |
| const enum ctrlr_prot_type type) |
| { |
| const struct spi_ctrlr *ctrlr; |
| struct region flash_region = { 0 }; |
| |
| if (!flash) |
| return -1; |
| |
| flash_region.size = flash->size; |
| |
| if (!region_is_subregion(&flash_region, region)) |
| return -1; |
| |
| ctrlr = flash->spi.ctrlr; |
| |
| if (!ctrlr) |
| return -1; |
| |
| if (ctrlr->flash_protect) |
| return ctrlr->flash_protect(flash, region, type); |
| |
| return -1; |
| } |
| |
| int spi_flash_vector_helper(const struct spi_slave *slave, |
| struct spi_op vectors[], size_t count, |
| int (*func)(const struct spi_slave *slave, const void *dout, |
| size_t bytesout, void *din, size_t bytesin)) |
| { |
| int ret; |
| void *din; |
| size_t bytes_in; |
| |
| if (count < 1 || count > 2) |
| return -1; |
| |
| /* SPI flash commands always have a command first... */ |
| if (!vectors[0].dout || !vectors[0].bytesout) |
| return -1; |
| /* And not read any data during the command. */ |
| if (vectors[0].din || vectors[0].bytesin) |
| return -1; |
| |
| if (count == 2) { |
| /* If response bytes requested ensure the buffer is valid. */ |
| if (vectors[1].bytesin && !vectors[1].din) |
| return -1; |
| /* No sends can accompany a receive. */ |
| if (vectors[1].dout || vectors[1].bytesout) |
| return -1; |
| din = vectors[1].din; |
| bytes_in = vectors[1].bytesin; |
| } else { |
| din = NULL; |
| bytes_in = 0; |
| } |
| |
| ret = func(slave, vectors[0].dout, vectors[0].bytesout, din, bytes_in); |
| |
| if (ret) { |
| vectors[0].status = SPI_OP_FAILURE; |
| if (count == 2) |
| vectors[1].status = SPI_OP_FAILURE; |
| } else { |
| vectors[0].status = SPI_OP_SUCCESS; |
| if (count == 2) |
| vectors[1].status = SPI_OP_SUCCESS; |
| } |
| |
| return ret; |
| } |