cm-t35: add support for loading splash image from NAND

Add support for loading splash image from NAND

Signed-off-by: Nikita Kiryanov <nikita@compulab.co.il>
Signed-off-by: Igor Grinberg <grinberg@compulab.co.il>

board/cm_t35/cm_t35.c

@@ -34,7 +34,9 @@
 #include <i2c.h>
 #include <usb.h>
 #include <mmc.h>
+#include <nand.h>
 #include <twl4030.h>
+#include <bmp_layout.h>
 #include <linux/compiler.h>
 
 #include <asm/io.h>
@@ -76,6 +78,65 @@ static u32 gpmc_nand_config[GPMC_MAX_REG] = {
 	0,
 };
 
+#ifdef CONFIG_LCD
+#ifdef CONFIG_CMD_NAND
+static int splash_load_from_nand(u32 bmp_load_addr)
+{
+	struct bmp_header *bmp_hdr;
+	int res, splash_screen_nand_offset = 0x100000;
+	size_t bmp_size, bmp_header_size = sizeof(struct bmp_header);
+
+	if (bmp_load_addr + bmp_header_size >= gd->start_addr_sp)
+		goto splash_address_too_high;
+
+	res = nand_read_skip_bad(&nand_info[nand_curr_device],
+			splash_screen_nand_offset, &bmp_header_size,
+			(u_char *)bmp_load_addr);
+	if (res < 0)
+		return res;
+
+	bmp_hdr = (struct bmp_header *)bmp_load_addr;
+	bmp_size = le32_to_cpu(bmp_hdr->file_size);
+
+	if (bmp_load_addr + bmp_size >= gd->start_addr_sp)
+		goto splash_address_too_high;
+
+	return nand_read_skip_bad(&nand_info[nand_curr_device],
+			splash_screen_nand_offset, &bmp_size,
+			(u_char *)bmp_load_addr);
+
+splash_address_too_high:
+	printf("Error: splashimage address too high. Data overwrites U-Boot "
+		"and/or placed beyond DRAM boundaries.\n");
+
+	return -1;
+}
+#else
+static inline int splash_load_from_nand(void)
+{
+	return -1;
+}
+#endif /* CONFIG_CMD_NAND */
+
+int board_splash_screen_prepare(void)
+{
+	char *env_splashimage_value;
+	u32 bmp_load_addr;
+
+	env_splashimage_value = getenv("splashimage");
+	if (env_splashimage_value == NULL)
+		return -1;
+
+	bmp_load_addr = simple_strtoul(env_splashimage_value, 0, 16);
+	if (bmp_load_addr == 0) {
+		printf("Error: bad splashimage address specified\n");
+		return -1;
+	}
+
+	return splash_load_from_nand(bmp_load_addr);
+}
+#endif /* CONFIG_LCD */
+
 /*
  * Routine: board_init
  * Description: hardware init.

include/configs/cm_t35.h

@@ -344,5 +344,9 @@
 #define LCD_BPP		LCD_COLOR16
 
 #define CONFIG_LCD
+#define CONFIG_SPLASH_SCREEN
+#define CONFIG_CMD_BMP
+#define CONFIG_BMP_16BPP
+#define CONFIG_SPLASH_SCREEN_PREPARE
 
 #endif /* __CONFIG_H */