diff options
| -rw-r--r-- | ichspi.c | 50 |
1 files changed, 25 insertions, 25 deletions
@@ -922,37 +922,31 @@ static int ich9_run_opcode(OPCODE op, uint32_t offset, static int run_opcode(OPCODE op, uint32_t offset, uint8_t datalength, uint8_t * data) { + /* max_data_read == max_data_write for all Intel/VIA SPI masters */ + uint8_t maxlength = spi_programmer->max_data_read; + + if (spi_programmer->type == SPI_CONTROLLER_NONE) { + msg_perr("%s: unsupported chipset\n", __func__); + return -1; + } + + if (datalength > maxlength) { + msg_perr("%s: Internal command size error for " + "opcode 0x%02x, got datalength=%i, want <=%i\n", + __func__, op.opcode, datalength, maxlength); + return SPI_INVALID_LENGTH; + } + switch (spi_programmer->type) { case SPI_CONTROLLER_VIA: - if (datalength > 16) { - msg_perr("%s: Internal command size error for " - "opcode 0x%02x, got datalength=%i, want <=16\n", - __func__, op.opcode, datalength); - return SPI_INVALID_LENGTH; - } - return ich7_run_opcode(op, offset, datalength, data, 16); case SPI_CONTROLLER_ICH7: - if (datalength > 64) { - msg_perr("%s: Internal command size error for " - "opcode 0x%02x, got datalength=%i, want <=16\n", - __func__, op.opcode, datalength); - return SPI_INVALID_LENGTH; - } - return ich7_run_opcode(op, offset, datalength, data, 64); + return ich7_run_opcode(op, offset, datalength, data, maxlength); case SPI_CONTROLLER_ICH9: - if (datalength > 64) { - msg_perr("%s: Internal command size error for " - "opcode 0x%02x, got datalength=%i, want <=16\n", - __func__, op.opcode, datalength); - return SPI_INVALID_LENGTH; - } return ich9_run_opcode(op, offset, datalength, data); default: - msg_perr("%s: unsupported chipset\n", __func__); + /* If we ever get here, something really weird happened */ + return -1; } - - /* If we ever get here, something really weird happened */ - return -1; } static int ich_spi_send_command(unsigned int writecnt, unsigned int readcnt, @@ -1038,7 +1032,13 @@ static int ich_spi_send_command(unsigned int writecnt, unsigned int readcnt, } } - /* translate read/write array/count */ + /* Translate read/write array/count. + * The maximum data length is identical for the maximum read length and + * for the maximum write length excluding opcode and address. Opcode and + * address are stored in separate registers, not in the data registers + * and are thus not counted towards data length. The only exception + * applies if the opcode definition (un)intentionally classifies said + * opcode incorrectly as non-address opcode or vice versa. */ if (opcode->spi_type == SPI_OPCODE_TYPE_WRITE_NO_ADDRESS) { data = (uint8_t *) (writearr + 1); count = writecnt - 1; |
