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authorVladimir Serbinenko <phcoder@gmail.com>2014-08-27 23:22:50 +0200
committerVladimir Serbinenko <phcoder@gmail.com>2014-08-30 19:26:33 +0200
commited74dcd7f055e07f96562b0a866c185f251016ac (patch)
treeb51b35218d778c312911a01e6675b972eec67458 /src/drivers/i2c
parentfc10c342661a8825af200a92822ea50ea636eed0 (diff)
downloadcoreboot-ed74dcd7f055e07f96562b0a866c185f251016ac.tar.xz
lenovo: Read mainboard version from AT24RF08C.
Tablets have different mainboard version than laptop variants. Change-Id: I77a1e2b50d30dcf3fa064e0c378ceca7ccf96e89 Signed-off-by: Vladimir Serbinenko <phcoder@gmail.com> Reviewed-on: http://review.coreboot.org/6785 Reviewed-by: Edward O'Callaghan <eocallaghan@alterapraxis.com> Tested-by: build bot (Jenkins)
Diffstat (limited to 'src/drivers/i2c')
-rw-r--r--src/drivers/i2c/at24rf08c/lenovo_serials.c91
1 files changed, 74 insertions, 17 deletions
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 <console/console.h>
#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;
+}