arch: rockchip: add set dfu alt info api

Signed-off-by: Yifeng Zhao <yifeng.zhao@rock-chips.com>
Change-Id: Idc6bd66c5b85a2bb100da3f270dd86b48dec8886

arch/arm/mach-rockchip/Makefile

@@ -77,3 +77,4 @@ obj-$(CONFIG_SPL_BUILD) += $(obj-spl-y)
 obj-$(CONFIG_TPL_BUILD) += $(obj-tpl-y)
 
 obj-$(CONFIG_ROCKCHIP_PRELOADER_ATAGS) += rk_atags.o
+obj-$(CONFIG_SET_DFU_ALT_INFO) += dfu_alt_info.o

arch/arm/mach-rockchip/dfu_alt_info.c

@@ -0,0 +1,66 @@
+/*
+ * (C) Copyright 2021 Rockchip Electronics Co., Ltd
+ *
+ * SPDX-License-Identifier:     GPL-2.0+
+ */
+
+#include <common.h>
+#include <boot_rkimg.h>
+#include <memalign.h>
+
+#define CONFIG_SET_DFU_ALT_BUF_LEN	(SZ_1K)
+static char *get_dfu_alt(char *interface, char *devstr)
+{
+	struct blk_desc *dev_desc;
+	char *alt_boot;
+
+	dev_desc = rockchip_get_bootdev();
+	if (!dev_desc) {
+		printf("%s: dev_desc is NULL!\n", __func__);
+		return NULL;
+	}
+
+	switch (dev_desc->if_type) {
+#ifdef CONFIG_MMC
+	case IF_TYPE_MMC:
+		alt_boot = DFU_ALT_BOOT_EMMC;
+		break;
+#endif
+#ifdef CONFIG_MTD_BLK
+	case IF_TYPE_MTD:
+		alt_boot = DFU_ALT_BOOT_MTD;
+		break;
+#endif
+	default:
+		printf("[dfu ERROR]:Boot device type is invalid!\n");
+		return NULL;
+	}
+
+	return alt_boot;
+}
+
+void set_dfu_alt_info(char *interface, char *devstr)
+{
+	size_t buf_size = CONFIG_SET_DFU_ALT_BUF_LEN;
+	ALLOC_CACHE_ALIGN_BUFFER(char, buf, buf_size);
+	char *alt_info = "Settings not found!";
+	char *status = "error!\n";
+	char *alt_setting;
+	int offset = 0;
+
+	puts("DFU alt info setting: ");
+
+	alt_setting = get_dfu_alt(interface, devstr);
+	if (alt_setting) {
+		env_set("dfu_alt_boot", alt_setting);
+		offset = snprintf(buf, buf_size, "%s", alt_setting);
+	}
+
+	if (offset) {
+		alt_info = buf;
+		status = "done\n";
+	}
+
+	env_set("dfu_alt_info", alt_info);
+	puts(status);
+}