diff options
Diffstat (limited to 'common')
| -rw-r--r-- | common/cmd_i2c.c | 45 |
1 files changed, 36 insertions, 9 deletions
diff --git a/common/cmd_i2c.c b/common/cmd_i2c.c index 62b0b4863d..ad38cbf6e1 100644 --- a/common/cmd_i2c.c +++ b/common/cmd_i2c.c @@ -342,9 +342,10 @@ static int do_i2c_write(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[ int ret; #ifdef CONFIG_DM_I2C struct udevice *dev; + struct dm_i2c_chip *i2c_chip; #endif - if (argc != 5) + if ((argc < 5) || (argc > 6)) return cmd_usage(cmdtp); /* @@ -367,7 +368,7 @@ static int do_i2c_write(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[ return cmd_usage(cmdtp); /* - * Length is the number of objects, not number of bytes. + * Length is the number of bytes. */ length = simple_strtoul(argv[4], NULL, 16); @@ -377,22 +378,47 @@ static int do_i2c_write(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[ ret = i2c_set_chip_offset_len(dev, alen); if (ret) return i2c_report_err(ret, I2C_ERR_WRITE); + i2c_chip = dev_get_parent_platdata(dev); + if (!i2c_chip) + return i2c_report_err(ret, I2C_ERR_WRITE); #endif - while (length-- > 0) { + if (argc == 6 && !strcmp(argv[5], "-s")) { + /* + * Write all bytes in a single I2C transaction. If the target + * device is an EEPROM, it is your responsibility to not cross + * a page boundary. No write delay upon completion, take this + * into account if linking commands. + */ #ifdef CONFIG_DM_I2C - ret = dm_i2c_write(dev, devaddr++, memaddr++, 1); + i2c_chip->flags &= ~DM_I2C_CHIP_WR_ADDRESS; + ret = dm_i2c_write(dev, devaddr, memaddr, length); #else - ret = i2c_write(chip, devaddr++, alen, memaddr++, 1); + ret = i2c_write(chip, devaddr, alen, memaddr, length); #endif if (ret) return i2c_report_err(ret, I2C_ERR_WRITE); + } else { + /* + * Repeated addressing - perform <length> separate + * write transactions of one byte each + */ + while (length-- > 0) { +#ifdef CONFIG_DM_I2C + i2c_chip->flags |= DM_I2C_CHIP_WR_ADDRESS; + ret = dm_i2c_write(dev, devaddr++, memaddr++, 1); +#else + ret = i2c_write(chip, devaddr++, alen, memaddr++, 1); +#endif + if (ret) + return i2c_report_err(ret, I2C_ERR_WRITE); /* * No write delay with FRAM devices. */ #if !defined(CONFIG_SYS_I2C_FRAM) - udelay(11000); + udelay(11000); #endif + } } return 0; } @@ -1827,7 +1853,7 @@ static cmd_tbl_t cmd_i2c_sub[] = { U_BOOT_CMD_MKENT(nm, 2, 1, do_i2c_nm, "", ""), U_BOOT_CMD_MKENT(probe, 0, 1, do_i2c_probe, "", ""), U_BOOT_CMD_MKENT(read, 5, 1, do_i2c_read, "", ""), - U_BOOT_CMD_MKENT(write, 5, 0, do_i2c_write, "", ""), + U_BOOT_CMD_MKENT(write, 6, 0, do_i2c_write, "", ""), #ifdef CONFIG_DM_I2C U_BOOT_CMD_MKENT(flags, 2, 1, do_i2c_flags, "", ""), #endif @@ -1894,7 +1920,8 @@ static char i2c_help_text[] = "i2c nm chip address[.0, .1, .2] - write to I2C device (constant address)\n" "i2c probe [address] - test for and show device(s) on the I2C bus\n" "i2c read chip address[.0, .1, .2] length memaddress - read to memory\n" - "i2c write memaddress chip address[.0, .1, .2] length - write memory to i2c\n" + "i2c write memaddress chip address[.0, .1, .2] length [-s] - write memory\n" + " to I2C; the -s option selects bulk write in a single transaction\n" #ifdef CONFIG_DM_I2C "i2c flags chip [flags] - set or get chip flags\n" #endif @@ -1906,7 +1933,7 @@ static char i2c_help_text[] = #endif U_BOOT_CMD( - i2c, 6, 1, do_i2c, + i2c, 7, 1, do_i2c, "I2C sub-system", i2c_help_text ); |