diff options
Diffstat (limited to 'mstarddc_spi.c')
-rw-r--r-- | mstarddc_spi.c | 234 |
1 files changed, 234 insertions, 0 deletions
diff --git a/mstarddc_spi.c b/mstarddc_spi.c new file mode 100644 index 00000000..0b41a1b7 --- /dev/null +++ b/mstarddc_spi.c @@ -0,0 +1,234 @@ +/* + * This file is part of the flashrom project. + * + * Copyright (C) 2014 Alexandre Boeglin <alex@boeglin.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; version 2 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, write to the Free Software + * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#if CONFIG_MSTARDDC_SPI == 1 + +#include <stdio.h> +#include <string.h> +#include <stdlib.h> +#include <ctype.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <unistd.h> +#include <errno.h> +#include <sys/ioctl.h> +#include <linux/i2c-dev.h> +#include <linux/i2c.h> +#include "flash.h" +#include "programmer.h" +#include "spi.h" + +static const struct spi_master spi_master_mstarddc; + +static int mstarddc_fd; +static int mstarddc_addr; +static int mstarddc_doreset = 1; + +// MSTAR DDC Commands +#define MSTARDDC_SPI_WRITE 0x10 +#define MSTARDDC_SPI_READ 0x11 +#define MSTARDDC_SPI_END 0x12 +#define MSTARDDC_SPI_RESET 0x24 + +/* Returns 0 upon success, a negative number upon errors. */ +static int mstarddc_spi_shutdown(void *data) +{ + // Reset, disables ISP mode + if (mstarddc_doreset == 1) { + uint8_t cmd = MSTARDDC_SPI_RESET; + if (write(mstarddc_fd, &cmd, 1) < 0) { + msg_perr("Error sending reset command: errno %d.\n", + errno); + return -1; + } + } else { + msg_pinfo("Info: Reset command was not sent. " + "Either the noreset=1 option was used, " + "or an error occured.\n"); + } + + if (close(mstarddc_fd) < 0) { + msg_perr("Error closing device: errno %d.\n", errno); + return -1; + } + return 0; +} + +/* Returns 0 upon success, a negative number upon errors. */ +int mstarddc_spi_init(void) +{ + char *i2c_device; + char *i2c_address; + char *noreset; + + // Get device, address from command-line + i2c_device = extract_programmer_param("dev"); + if (i2c_device && strlen(i2c_device)) { + if ((i2c_address = strchr(i2c_device, ':'))) { + *i2c_address = '\0'; + i2c_address++; + } + if (!i2c_address || !strlen(i2c_address)) { + msg_perr("Error: no address specified.\n" + "Use flashrom -p mstarddc_spi:dev=/dev/device:address.\n"); + return -1; + } + mstarddc_addr = strtol(i2c_address, NULL, 16); + } else { + msg_perr("Error: no device specified.\n" + "Use flashrom -p mstarddc_spi:dev=/dev/device:address.\n"); + return -1; + } + msg_pinfo("Info: Will try to use device %s and address 0x%02x.\n", + i2c_device, mstarddc_addr); + + // Get noreset=1 option from command-line + if ((noreset = extract_programmer_param("noreset")) + && noreset[0] == '1') + mstarddc_doreset = 0; + msg_pinfo("Info: WILL %sreset the device at the end.\n", + mstarddc_doreset ? "" : "NOT "); + // Open device + if ((mstarddc_fd = open(i2c_device, O_RDWR)) < 0) { + switch (errno) { + case EACCES: + msg_perr("Error opening %s: Permission denied.\n" + "Please use sudo or run as root.\n", + i2c_device); + break; + case ENOENT: + msg_perr("Error opening %s: No such file.\n" + "Please check you specified the correct device.\n", + i2c_device); + break; + default: + msg_perr("Error opening %s: errno %d.\n", + i2c_device, errno); + } + return -1; + } + // Set slave address + if (ioctl(mstarddc_fd, I2C_SLAVE, mstarddc_addr) < 0) { + msg_perr("Error setting slave address 0x%02x: errno %d.\n", + mstarddc_addr, errno); + return -1; + } + // Enable ISP mode + uint8_t cmd[5] = { 'M', 'S', 'T', 'A', 'R' }; + if (write(mstarddc_fd, cmd, 5) < 0) { + int enable_err = errno; + uint8_t end_cmd = MSTARDDC_SPI_END; + + // Assume device is already in ISP mode, try to send END command + if (write(mstarddc_fd, &end_cmd, 1) < 0) { + msg_perr("Error enabling ISP mode: errno %d & %d.\n" + "Please check that device (%s) and address (0x%02x) are correct.\n", + enable_err, errno, i2c_device, mstarddc_addr); + return -1; + } + } + // Register shutdown function + register_shutdown(mstarddc_spi_shutdown, NULL); + + // Register programmer + register_spi_master(&spi_master_mstarddc); + return 0; +} + +/* Returns 0 upon success, a negative number upon errors. */ +static int mstarddc_spi_send_command(struct flashctx *flash, + unsigned int writecnt, + unsigned int readcnt, + const unsigned char *writearr, + unsigned char *readarr) +{ + int ret = 0; + uint8_t *cmd; + + if ((cmd = malloc((writecnt + 1) * sizeof(uint8_t))) < 0) { + msg_perr("Error allocating memory: errno %d.\n", errno); + ret = -1; + } + + if (!ret && writecnt) { + cmd[0] = MSTARDDC_SPI_WRITE; + memcpy(cmd + 1, writearr, writecnt); + if (write(mstarddc_fd, cmd, writecnt + 1) < 0) { + msg_perr("Error sending write command: errno %d.\n", + errno); + ret = -1; + } + } + + if (!ret && readcnt) { + struct i2c_rdwr_ioctl_data i2c_data; + struct i2c_msg msg[2]; + + cmd[0] = MSTARDDC_SPI_READ; + i2c_data.nmsgs = 2; + i2c_data.msgs = msg; + i2c_data.msgs[0].addr = mstarddc_addr; + i2c_data.msgs[0].len = 1; + i2c_data.msgs[0].flags = 0; + i2c_data.msgs[0].buf = cmd; + i2c_data.msgs[1].addr = mstarddc_addr; + i2c_data.msgs[1].len = readcnt; + i2c_data.msgs[1].flags = I2C_M_RD; + i2c_data.msgs[1].buf = readarr; + + if (ioctl(mstarddc_fd, I2C_RDWR, &i2c_data) < 0) { + msg_perr("Error sending read command: errno %d.\n", + errno); + ret = -1; + } + } + + if (!ret && (writecnt || readcnt)) { + cmd[0] = MSTARDDC_SPI_END; + if (write(mstarddc_fd, cmd, 1) < 0) { + msg_perr("Error sending end command: errno %d.\n", + errno); + ret = -1; + } + } + + /* Do not reset if something went wrong, as it might prevent from + * retrying flashing. */ + if (ret != 0) + mstarddc_doreset = 0; + + if (cmd) + free(cmd); + + return ret; +} + +static const struct spi_master spi_master_mstarddc = { + .type = SPI_CONTROLLER_MSTARDDC, + .max_data_read = 256, + .max_data_write = 256, + .command = mstarddc_spi_send_command, + .multicommand = default_spi_send_multicommand, + .read = default_spi_read, + .write_256 = default_spi_write_256, + .write_aai = default_spi_write_aai, +}; + +#endif |