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    /*
     * (C) Copyright 2015
     * Kamil Lulko, <rev13@wp.pl>
     *
     * SPDX-License-Identifier:	GPL-2.0+
     */
    
    #include <common.h>
    #include <asm/io.h>
    #include <asm/arch/stm32.h>
    
    #define STM32_FLASH_KEY1	0x45670123
    #define STM32_FLASH_KEY2	0xCDEF89AB
    
    flash_info_t flash_info[CONFIG_SYS_MAX_FLASH_BANKS];
    
    const u32 sect_sz_kb[CONFIG_SYS_MAX_FLASH_SECT] = {
    	[0 ... 3] =	16 * 1024,
    	[4] =		64 * 1024,
    	[5 ... 11] =	128 * 1024
    };
    
    static void stm32f4_flash_lock(u8 lock)
    {
    	if (lock) {
    		setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_LOCK);
    	} else {
    		writel(STM32_FLASH_KEY1, &STM32_FLASH->key);
    		writel(STM32_FLASH_KEY2, &STM32_FLASH->key);
    	}
    }
    
    unsigned long flash_init(void)
    {
    	unsigned long total_size = 0;
    	u8 i, j;
    
    	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
    		flash_info[i].flash_id = FLASH_STM32F4;
    		flash_info[i].sector_count = CONFIG_SYS_MAX_FLASH_SECT;
    		flash_info[i].start[0] = CONFIG_SYS_FLASH_BASE + (i << 20);
    		flash_info[i].size = sect_sz_kb[0];
    		for (j = 1; j < CONFIG_SYS_MAX_FLASH_SECT; j++) {
    			flash_info[i].start[j] = flash_info[i].start[j - 1]
    				+ (sect_sz_kb[j - 1]);
    			flash_info[i].size += sect_sz_kb[j];
    		}
    		total_size += flash_info[i].size;
    	}
    
    	return total_size;
    }
    
    void flash_print_info(flash_info_t *info)
    {
    	int i;
    
    	if (info->flash_id == FLASH_UNKNOWN) {
    		printf("missing or unknown FLASH type\n");
    		return;
    	} else if (info->flash_id == FLASH_STM32F4) {
    		printf("STM32F4 Embedded Flash\n");
    	}
    
    	printf("  Size: %ld MB in %d Sectors\n",
    	       info->size >> 20, info->sector_count);
    
    	printf("  Sector Start Addresses:");
    	for (i = 0; i < info->sector_count; ++i) {
    		if ((i % 5) == 0)
    			printf("\n   ");
    		printf(" %08lX%s",
    		       info->start[i],
    			info->protect[i] ? " (RO)" : "     ");
    	}
    	printf("\n");
    	return;
    }
    
    int flash_erase(flash_info_t *info, int first, int last)
    {
    	u8 bank = 0xFF;
    	int i;
    
    	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
    		if (info == &flash_info[i]) {
    			bank = i;
    			break;
    		}
    	}
    	if (bank == 0xFF)
    		return -1;
    
    	stm32f4_flash_lock(0);
    
    	for (i = first; i <= last; i++) {
    		while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY)
    			;
    
    		if (bank == 0) {
    			setbits_le32(&STM32_FLASH->cr,
    				     (i << STM32_FLASH_CR_SNB_OFFSET));
    		} else if (bank == 1) {
    			setbits_le32(&STM32_FLASH->cr,
    				     ((0x10 | i) << STM32_FLASH_CR_SNB_OFFSET));
    		} else {
    			stm32f4_flash_lock(1);
    			return -1;
    		}
    		setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SER);
    		setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_STRT);
    
    		while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY)
    			;
    
    		clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SER);
    		stm32f4_flash_lock(1);
    	}
    
    	return 0;
    }
    
    int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
    {
    	ulong i;
    
    	while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY)
    		;
    
    	stm32f4_flash_lock(0);
    
    	setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_PG);
    	/* To make things simple use byte writes only */
    	for (i = 0; i < cnt; i++) {
    		*(uchar *)(addr + i) = src[i];
    		while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY)
    			;
    	}
    	clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_PG);
    	stm32f4_flash_lock(1);
    
    	return 0;
    }