db410c: update wlan and bt mac addresses from firmware

The firmware that runs before u-boot modifies u-boot's device tree
adding the local-mac-address and local-bd-address properties for the
compatibles "qcom,wcnss-bt" and "qcom,wcnss-wlan".

This commit reads that firmware, retrieves the properties and fixups
the device tree that is passed to the kernel before booting.

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>

arch/arm/dts/dragonboard410c.dts

@@ -86,6 +86,16 @@
 			clock-frequency = <200000000>;
 		};
 
+		wcnss {
+			bt {
+				compatible="qcom,wcnss-bt";
+			};
+
+			wifi {
+				compatible="qcom,wcnss-wlan";
+			};
+		};
+
 		spmi@200f000 {
 			compatible = "qcom,spmi-pmic-arb";
 			reg = <0x200f800 0x200 0x2400000 0x400000 0x2c00000 0x400000>;

board/qualcomm/dragonboard410c/Makefile

@@ -5,4 +5,5 @@
 #
 
 obj-y	:= dragonboard410c.o
+obj-y	+= lowlevel_init.o
 extra-y += head.o

board/qualcomm/dragonboard410c/dragonboard410c.c

@@ -10,9 +10,16 @@
 #include <dm.h>
 #include <usb.h>
 #include <asm/gpio.h>
+#include <fdt_support.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
+/* pointer to the device tree ammended by the firmware */
+extern const void *fw_dtb;
+
+static char wlan_mac[ARP_HLEN];
+static char bt_mac[ARP_HLEN];
+
 int dram_init(void)
 {
 	gd->ram_size = PHYS_SDRAM_1_SIZE;
@@ -27,7 +34,6 @@ int dram_init_banksize(void)
 	return 0;
 }
 
-
 int board_prepare_usb(enum usb_init_type type)
 {
 	static struct udevice *pmic_gpio;
@@ -96,11 +102,6 @@ int board_prepare_usb(enum usb_init_type type)
 	return 0;
 }
 
-int board_init(void)
-{
-	return 0;
-}
-
 /* Check for vol- button - if pressed - stop autoboot */
 int misc_init_r(void)
 {
@@ -134,3 +135,39 @@ int misc_init_r(void)
 
 	return 0;
 }
+
+int board_init(void)
+{
+	int offset, len;
+	const char *mac;
+
+	/* take a copy of the firmware information (the user could unknownly
+	   overwrite that DDR via tftp or other means)  */
+
+	offset = fdt_node_offset_by_compatible(fw_dtb, -1, "qcom,wcnss-wlan");
+	if (offset >= 0) {
+		mac = fdt_getprop(fw_dtb, offset, "local-mac-address", &len);
+		if (mac)
+			memcpy(wlan_mac, mac, ARP_HLEN);
+	}
+
+	offset = fdt_node_offset_by_compatible(fw_dtb, -1, "qcom,wcnss-bt");
+	if (offset >= 0) {
+		mac = fdt_getprop(fw_dtb, offset, "local-bd-address", &len);
+		if (mac)
+			memcpy(bt_mac, mac, ARP_HLEN);
+	}
+
+	return 0;
+}
+
+int ft_board_setup(void *blob, bd_t *bd)
+{
+	do_fixup_by_compat(blob, "qcom,wcnss-wlan", "local-mac-address",
+			   wlan_mac, ARP_HLEN, 1);
+
+	do_fixup_by_compat(blob, "qcom,wcnss-bt", "local-bd-address",
+			   bt_mac, ARP_HLEN, 1);
+
+	return 0;
+}

board/qualcomm/dragonboard410c/lowlevel_init.S

@@ -0,0 +1,28 @@
+/*
+ * (C) Copyright 2016
+ * Cédric Schieli <cschieli@gmail.com>
+ *
+ * SPDX-License-Identifier:	GPL-2.0+
+ */
+
+#include <config.h>
+
+.align 8
+.global fw_dtb
+fw_dtb:
+	.dword 0x0
+
+/*
+ * Routine: save_boot_params (called after reset from start.S)
+ * Description: save ATAG/FDT address provided by the firmware at boot time
+ */
+
+.global save_boot_params
+save_boot_params:
+
+	/* The firmware provided ATAG/FDT address can be found in r2/x0 */
+	adr	x8, fw_dtb
+	str	x0, [x8]
+
+	/* Returns */
+	b	save_boot_params_ret

configs/dragonboard410c_defconfig

@@ -44,3 +44,6 @@ CONFIG_USB_ETHER_ASIX88179=y
 CONFIG_USB_ETHER_MCS7830=y
 CONFIG_USB_ETHER_SMSC95XX=y
 CONFIG_OF_LIBFDT_OVERLAY=y
+CONFIG_OF_CONTROL=y
+CONFIG_ENV_IS_IN_MMC=y
+CONFIG_OF_BOARD_SETUP=y