[U-Boot] [PATCH v3 5/5] board: ti: AM57xx: Add detection logic for AM57xx-evm

[Steve Kipisz]

Current AM57xx evm supports both BeagleBoard-X15
(http://beagleboard.org/x15) and AM57xx EVM
(http://www.ti.com/tool/tmdxevm5728).

The AM572x EValuation Module(EVM) provides an affordable platform to
quickly start evaluation of Sitara. ARM Cortex-A15 AM57x Processors
(AM5728, AM5726, AM5718, AM5716) and accelerate development for HMI,
machine vision, networking, medical imaging and many other industrial
applications. This EVM is based on the same BeagleBoard-X15 Chassis
and adds mPCIe, mSATA, LCD, touchscreen, Camera, push button and TI's
wlink8 offering.

Since the EEPROM contents are compatible between the BeagleBoard-X15 and
the AM57xx-evm, we add support for the detection logic to enable
support for various user programmable scripting capability.

NOTE: U-boot configuration is currently a superset of AM57xx evm and
BeagleBoard-X15 and no additional configuration tweaking is needed.

This change also sets up the stage for future support of TI AM57xx EVMs
to the same base bootloader build.

Signed-off-by: Steve Kipisz <s-kipisz2 at ti.com>
---
v3 Based on:
 master     83bf0057 arm: at91: reworked meesc board support

Build testing: MAKEALL -s omap4 -s omap5 (no warning/build errors)
	Boot Testing:
	am57xx_evm_nodt_config: http://pastebin.ubuntu.com/13105264/

Changes in v3 (since v2):
 - Rename is_xxx to board_is_xxx
 - Remove usage of default_name and default to beagle_x15 if there
   are errors reading the EEPROM

v2:  http://marc.info/?t=144655344600003&r=1&w=2
      (mailing list squashed original submission)

Build testing: MAKEALL -s omap4 -s omap5 (no warnings/build errors)
	Boot Testing:
	am57xx_evm_nodt_config: http://pastebin.ubuntu.com/13039296/
	beagle_x15_config: http://pastebin.ubuntu.com/13039331/

Changes in v2 (since v1):
	- move the board detection code into the new routine
	  do_board_detect
	- eliminate board.h and move the ix_xxx into board.c
	- redo commit message to be more clear

v1:  http://marc.info/?t=144608007900002&r=1&w=2
     http://marc.info/?t=144608007900004&r=1&w=2
	(mailing list squashed original submission)


 board/ti/am57xx/board.c      | 52 ++++++++++++++++++++++++++++++++++++++++++++
 include/configs/am57xx_evm.h |  4 ++++
 2 files changed, 56 insertions(+)

diff --git a/board/ti/am57xx/board.c b/board/ti/am57xx/board.c
index 042f9ab1965a..4aa8424e975e 100644
--- a/board/ti/am57xx/board.c
+++ b/board/ti/am57xx/board.c
@@ -31,6 +31,10 @@
 #include <ti-usb-phy-uboot.h>
 
 #include "mux_data.h"
+#include "../common/board.h"
+
+#define board_is_x15()		board_am_is("BBRDX15_")
+#define board_is_am572x_evm()	board_am_is("AM572PM_")
 
 #ifdef CONFIG_DRIVER_TI_CPSW
 #include <cpsw.h>
@@ -246,6 +250,52 @@ struct vcores_data beagle_x15_volts = {
 	.iva.pmic		= &tps659038,
 };
 
+#ifdef CONFIG_SPL_BUILD
+/* No env to setup for SPL */
+static inline void setup_board_eeprom_env(void) { }
+
+/* Override function to read eeprom information */
+void do_board_detect(void)
+{
+	struct ti_am_eeprom *ep;
+	int rc;
+
+	rc = ti_i2c_eeprom_am_get(CONFIG_EEPROM_BUS_ADDRESS,
+				  CONFIG_EEPROM_CHIP_ADDRESS, &ep);
+	if (rc)
+		printf("ti_i2c_eeprom_init failed %d\n", rc);
+}
+
+#else	/* CONFIG_SPL_BUILD */
+
+static void setup_board_eeprom_env(void)
+{
+	char *name = "beagle_x15";
+	int rc;
+	struct ti_am_eeprom_printable p;
+
+	rc = ti_i2c_eeprom_am_get_print(CONFIG_EEPROM_BUS_ADDRESS,
+					CONFIG_EEPROM_CHIP_ADDRESS, &p);
+	if (rc) {
+		printf("Invalid EEPROM data(@0x%p). Default to X15\n",
+		       TI_AM_EEPROM_DATA);
+		goto invalid_eeprom;
+	}
+
+	if (board_is_am572x_evm())
+		name = "am57xx_evm";
+	else
+		printf("Unidentified board claims %s in eeprom header\n",
+		       p.name);
+
+invalid_eeprom:
+	set_board_info_env(name, p.version, p.serial);
+}
+
+/* Eeprom is alread read by SPL.. nothing more to do here.. */
+
+#endif	/* CONFIG_SPL_BUILD */
+
 void hw_data_init(void)
 {
 	*prcm = &dra7xx_prcm;
@@ -265,6 +315,8 @@ int board_init(void)
 int board_late_init(void)
 {
 	init_sata(0);
+	setup_board_eeprom_env();
+
 	/*
 	 * DEV_CTRL.DEV_ON = 1 please - else palmas switches off in 8 seconds
 	 * This is the POWERHOLD-in-Low behavior.
diff --git a/include/configs/am57xx_evm.h b/include/configs/am57xx_evm.h
index 6308cab8e680..1fffdb18fbcd 100644
--- a/include/configs/am57xx_evm.h
+++ b/include/configs/am57xx_evm.h
@@ -88,4 +88,8 @@
 #define CONFIG_SYS_SCSI_MAX_DEVICE	(CONFIG_SYS_SCSI_MAX_SCSI_ID * \
 						CONFIG_SYS_SCSI_MAX_LUN)
 
+/* EEPROM */
+#define CONFIG_EEPROM_CHIP_ADDRESS 0x50
+#define CONFIG_EEPROM_BUS_ADDRESS 0
+
 #endif /* __CONFIG_AM57XX_EVM_H */
-- 
1.9.1