[U-Boot] [PATCH v1 02/07] db410c: update wlan and bt mac addresses from firmware

Jorge Ramirez-Ortiz
2018-01-10T10:34:35Z

From: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>

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 | 10 +++++
board/qualcomm/dragonboard410c/Makefile | 1 +
board/qualcomm/dragonboard410c/dragonboard410c.c | 49 +++++++++++++++++++++---
board/qualcomm/dragonboard410c/lowlevel_init.S | 28 ++++++++++++++
configs/dragonboard410c_defconfig | 3 ++
5 files changed, 85 insertions(+), 6 deletions(-)
create mode 100644 board/qualcomm/dragonboard410c/lowlevel_init.S

diff --git a/arch/arm/dts/dragonboard410c.dts b/arch/arm/dts/dragonboard410c.dts
index 7746622..25aeac4 100644
--- a/arch/arm/dts/dragonboard410c.dts
+++ b/arch/arm/dts/dragonboard410c.dts
@@ -86,6 +86,16 @@
clock-frequency = <200000000>;
};

+ wcnss {
+ bt {
+ compatible="qcom,wcnss-bt";
+ };
+
+ wifi {
+ compatible="qcom,wcnss-wlan";
+ };
+ };
+
spmi at 200f000 {
compatible = "qcom,spmi-pmic-arb";
reg = <0x200f800 0x200 0x2400000 0x400000 0x2c00000 0x400000>;
diff --git a/board/qualcomm/dragonboard410c/Makefile b/board/qualcomm/dragonboard410c/Makefile
index cd67808..5082383 100644
--- a/board/qualcomm/dragonboard410c/Makefile
+++ b/board/qualcomm/dragonboard410c/Makefile
@@ -5,4 +5,5 @@
#

obj-y := dragonboard410c.o
+obj-y += lowlevel_init.o
extra-y += head.o
diff --git a/board/qualcomm/dragonboard410c/dragonboard410c.c b/board/qualcomm/dragonboard410c/dragonboard410c.c
index 848e278..99fc91b 100644
--- a/board/qualcomm/dragonboard410c/dragonboard410c.c
+++ b/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;
+}
diff --git a/board/qualcomm/dragonboard410c/lowlevel_init.S b/board/qualcomm/dragonboard410c/lowlevel_init.S
new file mode 100644
index 0000000..15b2d0c
--- /dev/null
+++ b/board/qualcomm/dragonboard410c/lowlevel_init.S
@@ -0,0 +1,28 @@
+/*
+ * (C) Copyright 2016
+ * CÃ©dric 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
diff --git a/configs/dragonboard410c_defconfig b/configs/dragonboard410c_defconfig
index b71bff7..cfe9be9 100644
--- a/configs/dragonboard410c_defconfig
+++ b/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
--
2.7.4