OMAP3/4/5/AM33xx: Correct logic for checking FAT or RAW MMC

In the case of booting from certain peripherals, such as UART, we must
not see what the device descriptor says for RAW or FAT mode because in
addition to being nonsensical, it leads to a hang.  This is why we have
a test currently for the boot mode being within range.  The problem
however is that on some platforms we get MMC2_2 as the boot mode and not
the defined value for MMC2, and in others we get the value for MMC2_2.
This is required to fix eMMC booting on omap5_uevm.

Tested on am335x_evm (UART, NAND, SD), omap3_beagle (NAND, SD on
classic, SD only on xM rev C5) and omap5_uevm (SD, eMMC).

Signed-off-by: Tom Rini <trini@ti.com>

arch/arm/cpu/armv7/omap-common/lowlevel_init.S

@@ -60,10 +60,14 @@ ENTRY(save_boot_params)
 	ldr	r3, =boot_params
 	strb	r2, [r3, #BOOT_DEVICE_OFFSET]	@ spl_boot_device <- r1
 
-	/* boot mode is passed only for devices that can raw/fat mode */
-	cmp	r2, #BOOT_DEVICE_XIP
+	/*
+	 * boot mode is only valid for device that can be raw or FAT booted.
+	 * in other cases it may be fatal to look.  While platforms differ
+	 * in the values used for each MMC slot, they are contiguous.
+	 */
+	cmp	r2, #MMC_BOOT_DEVICES_START
 	blt	2f
-	cmp	r2, #BOOT_DEVICE_MMC2
+	cmp	r2, #MMC_BOOT_DEVICES_END
 	bgt	2f
 	/* Store the boot mode (raw/FAT) in omap_bootmode */
 	ldr	r2, [r0, #DEV_DESC_PTR_OFFSET]	@ get the device descriptor ptr

arch/arm/include/asm/arch-am33xx/spl.h

@@ -37,4 +37,7 @@
 #define BOOT_DEVICE_USBETH	68
 #define BOOT_DEVICE_CPGMAC	70
 #define BOOT_DEVICE_MMC2_2      0xFF
+
+#define MMC_BOOT_DEVICES_START	BOOT_DEVICE_MMC1
+#define MMC_BOOT_DEVICES_END	BOOT_DEVICE_MMC2
 #endif

arch/arm/include/asm/arch-omap3/spl.h

@@ -31,4 +31,7 @@
 #define BOOT_DEVICE_MMC1	6
 #define BOOT_DEVICE_XIPWAIT	7
 #define BOOT_DEVICE_MMC2_2      0xFF
+
+#define MMC_BOOT_DEVICES_START	BOOT_DEVICE_MMC2
+#define MMC_BOOT_DEVICES_END	BOOT_DEVICE_MMC1
 #endif

arch/arm/include/asm/arch-omap4/spl.h

@@ -32,4 +32,6 @@
 #define BOOT_DEVICE_MMC2	6
 #define BOOT_DEVICE_MMC2_2	0xFF
 
+#define MMC_BOOT_DEVICES_START	BOOT_DEVICE_MMC1
+#define MMC_BOOT_DEVICES_END	BOOT_DEVICE_MMC2
 #endif

arch/arm/include/asm/arch-omap5/spl.h

@@ -32,4 +32,6 @@
 #define BOOT_DEVICE_MMC2        6
 #define BOOT_DEVICE_MMC2_2	7
 
+#define MMC_BOOT_DEVICES_START	BOOT_DEVICE_MMC1
+#define MMC_BOOT_DEVICES_END	BOOT_DEVICE_MMC2_2
 #endif