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From f1ad90ae5fd07257ea42aa771e16a7798cd440bb Mon Sep 17 00:00:00 2001
From: Steve Sakoman <steve@sakoman.com>
Date: Fri, 12 Feb 2010 12:17:48 -0800
Subject: [PATCH 07/50] OMAP3: detect expansion board type/version using eeprom contents
---
board/overo/overo.c | 92 +++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 92 insertions(+), 0 deletions(-)
diff --git a/board/overo/overo.c b/board/overo/overo.c
index 3df1a12..2838a1f 100644
--- a/board/overo/overo.c
+++ b/board/overo/overo.c
@@ -39,6 +39,31 @@
#include <asm/mach-types.h>
#include "overo.h"
+static struct {
+ unsigned int device_vendor;
+ unsigned char revision;
+ unsigned char content;
+ unsigned char data[6];
+} expansion_config;
+
+#define TWL4030_I2C_BUS 0
+
+#define EXPANSION_EEPROM_I2C_BUS 2
+#define EXPANSION_EEPROM_I2C_ADDRESS 0x50
+
+#define GUMSTIX_VENDORID 0x0200
+
+#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_NO_EEPROM 0xfffffffe
+#define GUMSTIX_UNKNOWN 0xffffffff
+
#if defined(CONFIG_CMD_NET)
static void setup_net_chip(void);
#endif
@@ -130,6 +155,31 @@ int get_board_revision(void) {
}
/*
+ * 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)
+ return GUMSTIX_NO_EEPROM;
+
+ /* read configuration data */
+ i2c_read(EXPANSION_EEPROM_I2C_ADDRESS, 0, 1, (u8 *)&expansion_config,
+ sizeof(expansion_config));
+
+ if ( (expansion_config.device_vendor & 0xffff) != GUMSTIX_VENDORID )
+ return GUMSTIX_UNKNOWN;
+ else
+ return expansion_config.device_vendor;
+}
+
+
+/*
* Routine: misc_init_r
* Description: Configure board specific parts
*/
@@ -156,6 +206,48 @@ int misc_init_r(void)
printf(" unsupported\n");
}
+ switch (get_expansion_id()) {
+ case GUMSTIX_SUMMIT:
+ printf("Recognized Summit expansion board (rev %d %s)\n",
+ expansion_config.revision, expansion_config.data);
+ setenv("defaultdisplay", "dvi");
+ break;
+ case GUMSTIX_TOBI:
+ printf("Recognized Tobi expansion board (rev %d %s)\n",
+ expansion_config.revision, expansion_config.data);
+ setenv("defaultdisplay", "dvi");
+ break;
+ case GUMSTIX_TOBI_DUO:
+ printf("Recognized Tobi Duo expansion board (rev %d %s)\n",
+ expansion_config.revision, expansion_config.data);
+ break;
+ case GUMSTIX_PALO35:
+ printf("Recognized Palo 35 expansion board (rev %d %s)\n",
+ expansion_config.revision, expansion_config.data);
+ setenv("defaultdisplay", "lcd35");
+ break;
+ case GUMSTIX_PALO43:
+ printf("Recognized Palo 43 expansion board (rev %d %s)\n",
+ expansion_config.revision, expansion_config.data);
+ setenv("defaultdisplay", "lcd43");
+ break;
+ case GUMSTIX_CHESTNUT43:
+ printf("Recognized Chestnut 43 expansion board (rev %d %s)\n",
+ expansion_config.revision, expansion_config.data);
+ setenv("defaultdisplay", "lcd43");
+ break;
+ case GUMSTIX_PINTO:
+ printf("Recognized Pinto expansion board (rev %d %s)\n",
+ expansion_config.revision, expansion_config.data);
+ break;
+ case GUMSTIX_NO_EEPROM:
+ printf("No EEPROM on expansion board\n");
+ break;
+ case GUMSTIX_UNKNOWN:
+ printf("Unrecognized expansion board\n");
+ }
+
+ i2c_set_bus_num(TWL4030_I2C_BUS);
twl4030_power_init();
twl4030_led_init(TWL4030_LED_LEDEN_LEDAON | TWL4030_LED_LEDEN_LEDBON);
--
1.6.6.1
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