mach-snapdragon: dynamic load addresses

Heavily inspired by Apple board code. Use the LMB allocator to configure
load addresses at runtime, and implement a lookup table for selecting a
devicetree.

As some Qualcomm RBx boards have different RAM capacities and base
addresses, it isn't possible to hardcode these regions.

Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Sumit Garg <sumit.garg@linaro.org>
Tested-by: Sumit Garg <sumit.garg@linaro.org> #qcs404
Signed-off-by: Caleb Connolly <caleb.connolly@linaro.org>

arch/arm/Kconfig

@@ -1096,6 +1096,7 @@ config ARCH_SNAPDRAGON
 	select OF_SEPARATE
 	select SMEM
 	select SPMI
+	select BOARD_LATE_INIT
 	select OF_BOARD
 	select SAVE_PREV_BL_FDT_ADDR
 	select LINUX_KERNEL_IMAGE_HEADER

arch/arm/mach-snapdragon/board.c

@@ -22,6 +22,7 @@
 #include <linux/bug.h>
 #include <linux/psci.h>
 #include <linux/sizes.h>
+#include <lmb.h>
 #include <malloc.h>
 #include <usb.h>
 
@@ -159,6 +160,39 @@ int board_init(void)
 	return 0;
 }
 
+void __weak qcom_late_init(void)
+{
+}
+
+#define KERNEL_COMP_SIZE	SZ_64M
+
+#define addr_alloc(lmb, size) lmb_alloc(lmb, size, SZ_2M)
+
+/* Stolen from arch/arm/mach-apple/board.c */
+int board_late_init(void)
+{
+	struct lmb lmb;
+	u32 status = 0;
+
+	lmb_init_and_reserve(&lmb, gd->bd, (void *)gd->fdt_blob);
+
+	/* We need to be fairly conservative here as we support boards with just 1G of TOTAL RAM */
+	status |= env_set_hex("kernel_addr_r", addr_alloc(&lmb, SZ_128M));
+	status |= env_set_hex("ramdisk_addr_r", addr_alloc(&lmb, SZ_128M));
+	status |= env_set_hex("kernel_comp_addr_r", addr_alloc(&lmb, KERNEL_COMP_SIZE));
+	status |= env_set_hex("kernel_comp_size", KERNEL_COMP_SIZE);
+	status |= env_set_hex("scriptaddr", addr_alloc(&lmb, SZ_4M));
+	status |= env_set_hex("pxefile_addr_r", addr_alloc(&lmb, SZ_4M));
+	status |= env_set_hex("fdt_addr_r", addr_alloc(&lmb, SZ_2M));
+
+	if (status)
+		log_warning("%s: Failed to set run time variables\n", __func__);
+
+	qcom_late_init();
+
+	return 0;
+}
+
 static void build_mem_map(void)
 {
 	int i;

board/qualcomm/dragonboard410c/dragonboard410c.c

@@ -88,7 +88,7 @@ int misc_init_r(void)
 	return 0;
 }
 
-int board_late_init(void)
+int qcom_late_init(void)
 {
 	char serial[16];