From ed74dcd7f055e07f96562b0a866c185f251016ac Mon Sep 17 00:00:00 2001 From: Vladimir Serbinenko Date: Wed, 27 Aug 2014 23:22:50 +0200 Subject: lenovo: Read mainboard version from AT24RF08C. Tablets have different mainboard version than laptop variants. Change-Id: I77a1e2b50d30dcf3fa064e0c378ceca7ccf96e89 Signed-off-by: Vladimir Serbinenko Reviewed-on: http://review.coreboot.org/6785 Reviewed-by: Edward O'Callaghan Tested-by: build bot (Jenkins) --- src/drivers/i2c/at24rf08c/lenovo_serials.c | 91 ++++++++++++++++++++++++------ 1 file changed, 74 insertions(+), 17 deletions(-) (limited to 'src/drivers/i2c/at24rf08c') diff --git a/src/drivers/i2c/at24rf08c/lenovo_serials.c b/src/drivers/i2c/at24rf08c/lenovo_serials.c index 7a5b259798..53e76da033 100644 --- a/src/drivers/i2c/at24rf08c/lenovo_serials.c +++ b/src/drivers/i2c/at24rf08c/lenovo_serials.c @@ -26,35 +26,62 @@ #include #include "lenovo.h" -static void at24rf08c_read_string(u8 bank, u8 start, u8 len, char *result) +#define ERROR_STRING "*INVALID*" + +static device_t at24rf08c_find_bank(u8 bank) { - int i; device_t dev; - dev = dev_find_slot_on_smbus(1, 0x54 | bank); - if (dev == 0) { + if (!dev) printk(BIOS_WARNING, "EEPROM not found\n"); - memcpy(result, "*INVALID*", sizeof ("*INVALID*")); - return; + return dev; +} + +static int at24rf08c_read_byte(device_t dev, u8 addr) +{ + int t = -1; + int j; + + /* After a register write AT24RF08C (which we issued in init function) + sometimes stops responding. Retry several times in case of failure. + */ + for (j = 0; j < 100; j++) { + t = smbus_read_byte(dev, addr); + if (t >= 0) + return t; } + return t; +} + +static void at24rf08c_read_string_dev(device_t dev, u8 start, + u8 len, char *result) +{ + int i; for (i = 0; i < len; i++) { - int t; - int j; - /* After a register write AT24RF08C (which we issued in init function) sometimes stops responding. - Retry several times in case of failure. - */ - for (j = 0; j < 100; j++) { - t = smbus_read_byte(dev, start + i); - if (t >= 0) - break; - } + int t = at24rf08c_read_byte(dev, start + i); + if (t < 0x20 || t > 0x7f) { - memcpy(result, "*INVALID*", sizeof ("*INVALID*")); + memcpy(result, ERROR_STRING, sizeof (ERROR_STRING)); return; } result[i] = t; } + result[len] = '\0'; +} + +static void at24rf08c_read_string(u8 bank, u8 start, u8 len, char *result) +{ + device_t dev; + + dev = at24rf08c_find_bank(bank); + if (dev == 0) { + printk(BIOS_WARNING, "EEPROM not found\n"); + memcpy(result, ERROR_STRING, sizeof (ERROR_STRING)); + return; + } + + at24rf08c_read_string_dev(dev, start, len, result); } const char *smbios_mainboard_serial_number(void) @@ -141,3 +168,33 @@ void smbios_mainboard_set_uuid(u8 *uuid) memcpy (uuid, result, 16); } + +const char *smbios_mainboard_version(void) +{ + static char result[100]; + static int already_read; + device_t dev; + int len; + + if (already_read) + return result; + + memset (result, 0, sizeof (result)); + + dev = at24rf08c_find_bank(2); + if (dev == 0) { + memcpy(result, ERROR_STRING, sizeof (ERROR_STRING)); + return result; + } + + len = at24rf08c_read_byte(dev, 0x26) - 2; + if (len < 0 || len > sizeof(result) - 1) { + memcpy(result, ERROR_STRING, sizeof (ERROR_STRING)); + return result; + } + + at24rf08c_read_string_dev(dev, 0x27, len, result); + + already_read = 1; + return result; +} -- cgit v1.2.3