cfi_flash: Simplify dynamic flash bank number detection

This patch simplifies the use of CONFIG_SYS_MAX_FLASH_BANKS_DETECT. By
moving these optional variables and defines into the common code, board
specific code is minimized. Currently only the following board use
this feature:

APC405, IDS8247, TQM834x

And IDS8247 doesn't seem to really need this feature, since its not
updating the bank number variable at all. So this patch removes the
definition of CONFIG_SYS_MAX_FLASH_BANKS_DETECT from this board port.

This new framework will be used by the upcoming lwmon5 update as well.

Signed-off-by: Stefan Roese <sr@denx.de>
Acked-by: Heiko Schocher <hs@denx.de>
Cc: Matthias Fuchs <matthias.fuchs@esd.eu>

board/esd/apc405/apc405.c

@@ -30,6 +30,7 @@
 #include <command.h>
 #include <malloc.h>
 #include <flash.h>
+#include <mtd/cfi_flash.h>
 #include <asm/4xx_pci.h>
 #include <pci.h>
 
@@ -39,9 +40,6 @@ DECLARE_GLOBAL_DATA_PTR;
 
 extern int do_reset (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
 extern void lxt971_no_sleep(void);
-extern ulong flash_get_size (ulong base, int banknum);
-
-int flash_banks = CONFIG_SYS_MAX_FLASH_BANKS_DETECT;
 
 /* fpga configuration data - gzip compressed and generated by bin2c */
 const unsigned char fpgadata[] =
@@ -185,7 +183,7 @@ int board_early_init_f (void)
 int board_early_init_r(void)
 {
 	if (gd->board_type >= 8)
-		flash_banks = 1;
+		cfi_flash_num_flash_banks = 1;
 
 	return 0;
 }

board/tqc/tqm834x/tqm834x.c

@@ -30,6 +30,8 @@
 #include <miiphy.h>
 #include <asm/mmu.h>
 #include <pci.h>
+#include <flash.h>
+#include <mtd/cfi_flash.h>
 
 DECLARE_GLOBAL_DATA_PTR;
 
@@ -52,12 +54,8 @@ DECLARE_GLOBAL_DATA_PTR;
 #define INITIAL_CS_CONFIG	(CSCONFIG_EN | CSCONFIG_ROW_BIT_12 | \
 				CSCONFIG_COL_BIT_9)
 
-/* Global variable used to store detected number of banks */
-int tqm834x_num_flash_banks;
-
 /* External definitions */
 ulong flash_get_size (ulong base, int banknum);
-extern flash_info_t flash_info[];
 
 /* Local functions */
 static int detect_num_flash_banks(void);
@@ -190,7 +188,7 @@ static int detect_num_flash_banks(void)
 	ulong bank2_size;
 	ulong total_size;
 
-	tqm834x_num_flash_banks = 2;	/* assume two banks */
+	cfi_flash_num_flash_banks = 2;	/* assume two banks */
 
 	/* Get bank 1 and 2 information */
 	bank1_size = flash_get_size(CONFIG_SYS_FLASH_BASE, 0);
@@ -244,13 +242,13 @@ static int detect_num_flash_banks(void)
 				 * we got the some data reading from Flash.
 				 * There is only one mirrored bank.
 				 */
-				tqm834x_num_flash_banks = 1;
+				cfi_flash_num_flash_banks = 1;
 				total_size = bank1_size;
 			}
 		}
 	}
 
-	debug("Number of flash banks detected: %d\n", tqm834x_num_flash_banks);
+	debug("Number of flash banks detected: %d\n", cfi_flash_num_flash_banks);
 
 	/* set OR0 and BR0 */
 	set_lbc_or(0, CONFIG_SYS_OR_TIMING_FLASH |

common/cmd_bootm.c

@@ -77,6 +77,7 @@ static int image_info (unsigned long addr);
 
 #if defined(CONFIG_CMD_IMLS)
 #include <flash.h>
+#include <mtd/cfi_flash.h>
 extern flash_info_t flash_info[]; /* info for FLASH chips */
 static int do_imls (cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]);
 #endif

common/flash.c

@@ -27,6 +27,7 @@
 #include <flash.h>
 
 #if !defined(CONFIG_SYS_NO_FLASH)
+#include <mtd/cfi_flash.h>
 
 extern flash_info_t  flash_info[]; /* info for FLASH chips */
 

drivers/mtd/cfi_flash.c

@@ -62,20 +62,9 @@
  * reading and writing ... (yes there is such a Hardware).
  */
 
-#ifndef CONFIG_SYS_FLASH_BANKS_LIST
-#define CONFIG_SYS_FLASH_BANKS_LIST { CONFIG_SYS_FLASH_BASE }
-#endif
-
 static uint flash_offset_cfi[2] = { FLASH_OFFSET_CFI, FLASH_OFFSET_CFI_ALT };
 static uint flash_verbose = 1;
 
-/* use CONFIG_SYS_MAX_FLASH_BANKS_DETECT if defined */
-#ifdef CONFIG_SYS_MAX_FLASH_BANKS_DETECT
-# define CFI_MAX_FLASH_BANKS	CONFIG_SYS_MAX_FLASH_BANKS_DETECT
-#else
-# define CFI_MAX_FLASH_BANKS	CONFIG_SYS_MAX_FLASH_BANKS
-#endif
-
 flash_info_t flash_info[CFI_MAX_FLASH_BANKS];	/* FLASH chips info */
 
 /*
@@ -85,6 +74,10 @@ flash_info_t flash_info[CFI_MAX_FLASH_BANKS];	/* FLASH chips info */
 #define CONFIG_SYS_FLASH_CFI_WIDTH	FLASH_CFI_8BIT
 #endif
 
+#if defined(CONFIG_SYS_MAX_FLASH_BANKS_DETECT)
+int cfi_flash_num_flash_banks = CONFIG_SYS_MAX_FLASH_BANKS_DETECT;
+#endif
+
 static phys_addr_t __cfi_flash_bank_addr(int i)
 {
 	return ((phys_addr_t [])CONFIG_SYS_FLASH_BANKS_LIST)[i];

include/configs/APC405.h

@@ -264,16 +264,10 @@
 /*
  * FLASH organization
  */
-#ifndef __ASSEMBLY__
-extern int flash_banks;
-#endif
-
 #define CONFIG_SYS_FLASH_BASE		0xFE000000
 #define CONFIG_SYS_FLASH_CFI		1	/* Flash is CFI conformant */
 #define CONFIG_FLASH_CFI_DRIVER	1	/* Use the common driver */
 #define CONFIG_SYS_MAX_FLASH_SECT	256	/* max num of sects on one chip */
-#define CONFIG_SYS_MAX_FLASH_BANKS	flash_banks /* max num of flash banks */
-					    /* updated in board_early_init_r */
 #define CONFIG_SYS_MAX_FLASH_BANKS_DETECT 2
 #define CONFIG_SYS_FLASH_QUIET_TEST	1
 #define CONFIG_SYS_FLASH_INCREMENT	0x01000000

include/configs/IDS8247.h

@@ -227,7 +227,7 @@
 #define CONFIG_SYS_FLASH_CFI				/* The flash is CFI compatible  */
 #define CONFIG_FLASH_CFI_DRIVER			/* Use common CFI driver        */
 #define CONFIG_SYS_FLASH_BANKS_LIST	{ 0xFF800000 }
-#define CONFIG_SYS_MAX_FLASH_BANKS_DETECT	1
+#define CONFIG_SYS_MAX_FLASH_BANKS	1	/* max number of memory banks	      */
 /* What should the base address of the main FLASH be and how big is
  * it (in MBytes)? This must contain TEXT_BASE from board/ids8247/config.mk
  * The main FLASH is whichever is connected to *CS0.
@@ -242,7 +242,6 @@
 /*-----------------------------------------------------------------------
  * FLASH organization
  */
-#define CONFIG_SYS_MAX_FLASH_BANKS	1	/* max num of memory banks      */
 #define CONFIG_SYS_MAX_FLASH_SECT	128	/* max num of sects on one chip */
 
 #define CONFIG_SYS_FLASH_ERASE_TOUT	240000	/* Flash Erase Timeout (in ms)  */

include/configs/TQM834x.h

@@ -101,10 +101,6 @@
  * defined as tqm834x_num_flash_banks.
  */
 #define CONFIG_SYS_MAX_FLASH_BANKS_DETECT	2
-#ifndef __ASSEMBLY__
-extern int tqm834x_num_flash_banks;
-#endif
-#define CONFIG_SYS_MAX_FLASH_BANKS (tqm834x_num_flash_banks)
 
 #define CONFIG_SYS_MAX_FLASH_SECT		512	/* max sectors per device */
 

include/flash.h

@@ -58,6 +58,8 @@ typedef struct {
 #endif
 } flash_info_t;
 
+extern flash_info_t flash_info[]; /* info for FLASH chips	*/
+
 typedef unsigned long flash_sect_t;
 
 /*

include/mtd/cfi_flash.h

@@ -151,6 +151,24 @@ struct cfi_pri_hdr {
 	u8	minor_version;
 } __attribute__((packed));
 
+#ifndef CONFIG_SYS_FLASH_BANKS_LIST
+#define CONFIG_SYS_FLASH_BANKS_LIST { CONFIG_SYS_FLASH_BASE }
+#endif
+
+/*
+ * CFI_MAX_FLASH_BANKS only used for flash_info struct declaration.
+ *
+ * Use CONFIG_SYS_MAX_FLASH_BANKS_DETECT if defined
+ */
+#if defined(CONFIG_SYS_MAX_FLASH_BANKS_DETECT)
+#define CONFIG_SYS_MAX_FLASH_BANKS	(cfi_flash_num_flash_banks)
+#define CFI_MAX_FLASH_BANKS	CONFIG_SYS_MAX_FLASH_BANKS_DETECT
+/* board code can update this variable before CFI detection */
+extern int cfi_flash_num_flash_banks;
+#else
+#define CFI_MAX_FLASH_BANKS	CONFIG_SYS_MAX_FLASH_BANKS
+#endif
+
 void flash_write_cmd(flash_info_t * info, flash_sect_t sect,
 		     uint offset, u32 cmd);