stm32: stm32f4: move flash driver to mtd driver location

Same flash driver can be used by other stm32 families like stm32f7.
Better place for this driver would be mtd driver location.

Signed-off-by: Vikas Manocha <vikas.manocha@st.com>

arch/arm/include/asm/arch-stm32f4/stm32.h

@@ -82,16 +82,6 @@ struct stm32_pwr_regs {
 	u32 csr;
 };
 
-struct stm32_flash_regs {
-	u32 acr;
-	u32 key;
-	u32 optkeyr;
-	u32 sr;
-	u32 cr;
-	u32 optcr;
-	u32 optcr1;
-};
-
 /*
  * Registers access macros
  */
@@ -104,18 +94,6 @@ struct stm32_flash_regs {
 #define STM32_PWR_BASE		(STM32_APB1PERIPH_BASE + 0x7000)
 #define STM32_PWR		((struct stm32_pwr_regs *)STM32_PWR_BASE)
 
-#define STM32_FLASH_BASE	(STM32_AHB1PERIPH_BASE + 0x3C00)
-#define STM32_FLASH		((struct stm32_flash_regs *)STM32_FLASH_BASE)
-
-#define STM32_FLASH_SR_BSY		(1 << 16)
-
-#define STM32_FLASH_CR_PG		(1 << 0)
-#define STM32_FLASH_CR_SER		(1 << 1)
-#define STM32_FLASH_CR_STRT		(1 << 16)
-#define STM32_FLASH_CR_LOCK		(1 << 31)
-#define STM32_FLASH_CR_SNB_OFFSET	3
-#define STM32_FLASH_CR_SNB_MASK		(15 << STM32_FLASH_CR_SNB_OFFSET)
-
 /*
  * Peripheral base addresses
  */
@@ -124,6 +102,14 @@ struct stm32_flash_regs {
 #define STM32_USART3_BASE	(STM32_APB1PERIPH_BASE + 0x4800)
 #define STM32_USART6_BASE	(STM32_APB2PERIPH_BASE + 0x1400)
 
+#define FLASH_CNTL_BASE		(STM32_AHB1PERIPH_BASE + 0x3C00)
+
+static const u32 sect_sz_kb[CONFIG_SYS_MAX_FLASH_SECT] = {
+	[0 ... 3] =	16 * 1024,
+	[4] =		64 * 1024,
+	[5 ... 11] =	128 * 1024
+};
+
 enum clock {
 	CLOCK_CORE,
 	CLOCK_AHB,
@@ -133,5 +119,6 @@ enum clock {
 
 int configure_clocks(void);
 unsigned long clock_get(enum clock clck);
+void stm32_flash_latency_cfg(int latency);
 
 #endif /* _MACH_STM32_H_ */

arch/arm/mach-stm32/stm32f4/Makefile

@@ -8,4 +8,4 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-obj-y += soc.o clock.o timer.o flash.o
+obj-y += soc.o clock.o timer.o

arch/arm/mach-stm32/stm32f4/clock.c

@@ -66,11 +66,6 @@
 #define PWR_CR_VOS_SCALE_MODE_2	(PWR_CR_VOS1)
 #define PWR_CR_VOS_SCALE_MODE_3	(PWR_CR_VOS0)
 
-#define FLASH_ACR_WS(n)		n
-#define FLASH_ACR_PRFTEN	(1 << 8)
-#define FLASH_ACR_ICEN		(1 << 9)
-#define FLASH_ACR_DCEN		(1 << 10)
-
 /*
  * RCC GPIO specific definitions
  */
@@ -181,10 +176,7 @@ int configure_clocks(void)
 	while (!(readl(&STM32_RCC->cr) & RCC_CR_PLLRDY))
 		;
 
-	/* 5 wait states, Prefetch enabled, D-Cache enabled, I-Cache enabled */
-	writel(FLASH_ACR_WS(5) | FLASH_ACR_PRFTEN | FLASH_ACR_ICEN
-		| FLASH_ACR_DCEN, &STM32_FLASH->acr);
-
+	stm32_flash_latency_cfg(5);
 	clrbits_le32(&STM32_RCC->cfgr, (RCC_CFGR_SW0 | RCC_CFGR_SW1));
 	setbits_le32(&STM32_RCC->cfgr, RCC_CFGR_SW_PLL);
 

drivers/mtd/Makefile

@@ -20,3 +20,4 @@ obj-$(CONFIG_FTSMC020) += ftsmc020.o
 obj-$(CONFIG_FLASH_CFI_LEGACY) += jedec_flash.o
 obj-$(CONFIG_MW_EEPROM) += mw_eeprom.o
 obj-$(CONFIG_ST_SMI) += st_smi.o
+obj-$(CONFIG_STM32_FLASH) += stm32_flash.o

arch/arm/mach-stm32/stm32f4/flash.c → drivers/mtd/stm32_flash.c

@@ -8,19 +8,20 @@
 #include <common.h>
 #include <asm/io.h>
 #include <asm/arch/stm32.h>
-
-#define STM32_FLASH_KEY1	0x45670123
-#define STM32_FLASH_KEY2	0xCDEF89AB
+#include "stm32_flash.h"
 
 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
-};
+#define STM32_FLASH		((struct stm32_flash_regs *)FLASH_CNTL_BASE)
+
+void stm32_flash_latency_cfg(int latency)
+{
+	/* 5 wait states, Prefetch enabled, D-Cache enabled, I-Cache enabled */
+	writel(FLASH_ACR_WS(5) | FLASH_ACR_PRFTEN | FLASH_ACR_ICEN
+		| FLASH_ACR_DCEN, &STM32_FLASH->acr);
+}
 
-static void stm32f4_flash_lock(u8 lock)
+static void stm32_flash_lock(u8 lock)
 {
 	if (lock) {
 		setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_LOCK);
@@ -36,7 +37,7 @@ unsigned long flash_init(void)
 	u8 i, j;
 
 	for (i = 0; i < CONFIG_SYS_MAX_FLASH_BANKS; i++) {
-		flash_info[i].flash_id = FLASH_STM32F4;
+		flash_info[i].flash_id = FLASH_STM32;
 		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];
@@ -58,8 +59,8 @@ void flash_print_info(flash_info_t *info)
 	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");
+	} else if (info->flash_id == FLASH_STM32) {
+		printf("stm32 Embedded Flash\n");
 	}
 
 	printf("  Size: %ld MB in %d Sectors\n",
@@ -91,7 +92,7 @@ int flash_erase(flash_info_t *info, int first, int last)
 	if (bank == 0xFF)
 		return -1;
 
-	stm32f4_flash_lock(0);
+	stm32_flash_lock(0);
 
 	for (i = first; i <= last; i++) {
 		while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY)
@@ -107,7 +108,7 @@ int flash_erase(flash_info_t *info, int first, int last)
 			setbits_le32(&STM32_FLASH->cr,
 				     ((0x10 | i) << STM32_FLASH_CR_SNB_OFFSET));
 		} else {
-			stm32f4_flash_lock(1);
+			stm32_flash_lock(1);
 			return -1;
 		}
 		setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SER);
@@ -119,7 +120,7 @@ int flash_erase(flash_info_t *info, int first, int last)
 		clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_SER);
 	}
 
-	stm32f4_flash_lock(1);
+	stm32_flash_lock(1);
 	return 0;
 }
 
@@ -130,7 +131,7 @@ int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 	while (readl(&STM32_FLASH->sr) & STM32_FLASH_SR_BSY)
 		;
 
-	stm32f4_flash_lock(0);
+	stm32_flash_lock(0);
 
 	setbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_PG);
 	/* To make things simple use byte writes only */
@@ -140,7 +141,7 @@ int write_buff(flash_info_t *info, uchar *src, ulong addr, ulong cnt)
 			;
 	}
 	clrbits_le32(&STM32_FLASH->cr, STM32_FLASH_CR_PG);
-	stm32f4_flash_lock(1);
+	stm32_flash_lock(1);
 
 	return 0;
 }

drivers/mtd/stm32_flash.h

@@ -0,0 +1,27 @@
+struct stm32_flash_regs {
+	u32 acr;
+	u32 key;
+	u32 optkeyr;
+	u32 sr;
+	u32 cr;
+	u32 optcr;
+	u32 optcr1;
+};
+
+#define STM32_FLASH_KEY1	0x45670123
+#define STM32_FLASH_KEY2	0xCDEF89AB
+
+#define STM32_FLASH_SR_BSY		(1 << 16)
+
+#define STM32_FLASH_CR_PG		(1 << 0)
+#define STM32_FLASH_CR_SER		(1 << 1)
+#define STM32_FLASH_CR_STRT		(1 << 16)
+#define STM32_FLASH_CR_LOCK		(1 << 31)
+#define STM32_FLASH_CR_SNB_OFFSET	3
+#define STM32_FLASH_CR_SNB_MASK		(15 << STM32_FLASH_CR_SNB_OFFSET)
+
+/* Flash ACR: Access control register */
+#define FLASH_ACR_WS(n)		n
+#define FLASH_ACR_PRFTEN	(1 << 8)
+#define FLASH_ACR_ICEN		(1 << 9)
+#define FLASH_ACR_DCEN		(1 << 10)

include/configs/stm32f429-discovery.h

@@ -47,6 +47,7 @@
 #define CONFIG_GREEN_LED		109
 
 #define CONFIG_STM32_GPIO
+#define CONFIG_STM32_FLASH
 #define CONFIG_STM32_SERIAL
 
 #define CONFIG_STM32_HSE_HZ		8000000

include/flash.h

@@ -465,7 +465,7 @@ extern flash_info_t *flash_get_info(ulong base);
 #define FLASH_S29GL064M 0x00F0		/* Spansion S29GL064M-R6		*/
 #define FLASH_S29GL128N 0x00F1		/* Spansion S29GL128N			*/
 
-#define FLASH_STM32F4	0x00F2		/* STM32F4 Embedded Flash */
+#define FLASH_STM32	0x00F2		/* STM32 Embedded Flash */
 #define FLASH_STM32F1	0x00F3		/* STM32F1 Embedded Flash */
 
 #define FLASH_UNKNOWN	0xFFFF		/* unknown flash type			*/