ARMV7: OMAP3: Add expansion board detection for Overo
Overo expansion boards contain an i2c eeprom to identify themselves.
This patch adds code to read and parse the eeprom contents. It prints
the expansion board name and revision and modifies environment variables
as appropriate.
Signed-off-by: Steve Sakoman <steve@sakoman.com>
Signed-off-by: Sandeep Paulraj <s-paulraj@ti.com>
diff --git a/board/overo/overo.c b/board/overo/overo.c
index 9c92693..f917e40 100644
--- a/board/overo/overo.c
+++ b/board/overo/overo.c
@@ -40,6 +40,32 @@
#include <asm/mach-types.h>
#include "overo.h"
+#define TWL4030_I2C_BUS 0
+#define EXPANSION_EEPROM_I2C_BUS 2
+#define EXPANSION_EEPROM_I2C_ADDRESS 0x51
+
+#define GUMSTIX_SUMMIT 0x01000200
+#define GUMSTIX_TOBI 0x02000200
+#define GUMSTIX_TOBI_DUO 0x03000200
+#define GUMSTIX_PALO35 0x04000200
+#define GUMSTIX_PALO43 0x05000200
+#define GUMSTIX_CHESTNUT43 0x06000200
+#define GUMSTIX_PINTO 0x07000200
+#define GUMSTIX_GALLOP43 0x08000200
+
+#define ETTUS_USRP_E 0x01000300
+
+#define GUMSTIX_NO_EEPROM 0xffffffff
+
+static struct {
+ unsigned int device_vendor;
+ unsigned char revision;
+ unsigned char content;
+ char fab_revision[8];
+ char env_var[16];
+ char env_setting[64];
+} expansion_config;
+
#if defined(CONFIG_CMD_NET)
static void setup_net_chip(void);
#endif
@@ -137,6 +163,31 @@
}
/*
+ * Routine: get_expansion_id
+ * Description: This function checks for expansion board by checking I2C
+ * bus 2 for the availability of an AT24C01B serial EEPROM.
+ * returns the device_vendor field from the EEPROM
+ */
+unsigned int get_expansion_id(void)
+{
+ i2c_set_bus_num(EXPANSION_EEPROM_I2C_BUS);
+
+ /* return GUMSTIX_NO_EEPROM if eeprom doesn't respond */
+ if (i2c_probe(EXPANSION_EEPROM_I2C_ADDRESS) == 1) {
+ i2c_set_bus_num(TWL4030_I2C_BUS);
+ return GUMSTIX_NO_EEPROM;
+ }
+
+ /* read configuration data */
+ i2c_read(EXPANSION_EEPROM_I2C_ADDRESS, 0, 1, (u8 *)&expansion_config,
+ sizeof(expansion_config));
+
+ i2c_set_bus_num(TWL4030_I2C_BUS);
+
+ return expansion_config.device_vendor;
+}
+
+/*
* Routine: misc_init_r
* Description: Configure board specific parts
*/
@@ -164,6 +215,70 @@
printf("Unable to detect mmc2 connection type\n");
}
+ switch (get_expansion_id()) {
+ case GUMSTIX_SUMMIT:
+ printf("Recognized Summit expansion board (rev %d %s)\n",
+ expansion_config.revision,
+ expansion_config.fab_revision);
+ setenv("defaultdisplay", "dvi");
+ break;
+ case GUMSTIX_TOBI:
+ printf("Recognized Tobi expansion board (rev %d %s)\n",
+ expansion_config.revision,
+ expansion_config.fab_revision);
+ setenv("defaultdisplay", "dvi");
+ break;
+ case GUMSTIX_TOBI_DUO:
+ printf("Recognized Tobi Duo expansion board (rev %d %s)\n",
+ expansion_config.revision,
+ expansion_config.fab_revision);
+ break;
+ case GUMSTIX_PALO35:
+ printf("Recognized Palo35 expansion board (rev %d %s)\n",
+ expansion_config.revision,
+ expansion_config.fab_revision);
+ setenv("defaultdisplay", "lcd35");
+ break;
+ case GUMSTIX_PALO43:
+ printf("Recognized Palo43 expansion board (rev %d %s)\n",
+ expansion_config.revision,
+ expansion_config.fab_revision);
+ setenv("defaultdisplay", "lcd43");
+ break;
+ case GUMSTIX_CHESTNUT43:
+ printf("Recognized Chestnut43 expansion board (rev %d %s)\n",
+ expansion_config.revision,
+ expansion_config.fab_revision);
+ setenv("defaultdisplay", "lcd43");
+ break;
+ case GUMSTIX_PINTO:
+ printf("Recognized Pinto expansion board (rev %d %s)\n",
+ expansion_config.revision,
+ expansion_config.fab_revision);
+ break;
+ case GUMSTIX_GALLOP43:
+ printf("Recognized Gallop43 expansion board (rev %d %s)\n",
+ expansion_config.revision,
+ expansion_config.fab_revision);
+ setenv("defaultdisplay", "lcd43");
+ break;
+ case ETTUS_USRP_E:
+ printf("Recognized Ettus Research USRP-E (rev %d %s)\n",
+ expansion_config.revision,
+ expansion_config.fab_revision);
+ MUX_USRP_E();
+ setenv("defaultdisplay", "dvi");
+ break;
+ case GUMSTIX_NO_EEPROM:
+ printf("No EEPROM on expansion board\n");
+ break;
+ default:
+ printf("Unrecognized expansion board\n");
+ }
+
+ if (expansion_config.content == 1)
+ setenv(expansion_config.env_var, expansion_config.env_setting);
+
dieid_num_r();
return 0;