cfi_flash: use specific width types for cword

This patch changes the cword union to use specific length types that are
architecture indepented.

This patch also renames the members of the cword union to represent
their usage, i.e.:

    c  -> w8
    s  -> w16
    l  -> w32
    ll -> w64

Where "w" stands for "width" in bits.

I discovered this problem when enabling CFI flash on vexpress64.
cword.l was an unsigned long int, but it was intended to be 32 bits wide.
Unfortunately, it's 64-bits wide on a 64-bit system, meaning that a
64-bit system fails when attempting to use 32-bit wide CFI flash parts.

Similar problems also existed with the other cword sizes.

Signed-off-by: Ryan Harkin <ryan.harkin@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Stefan Roese <sr@denx.de>

drivers/mtd/cfi_flash.c

@@ -335,34 +335,34 @@ void flash_write_cmd (flash_info_t * info, flash_sect_t sect,
 	switch (info->portwidth) {
 	case FLASH_CFI_8BIT:
 		debug ("fwc addr %p cmd %x %x 8bit x %d bit\n", addr, cmd,
-		       cword.c, info->chipwidth << CFI_FLASH_SHIFT_WIDTH);
-		flash_write8(cword.c, addr);
+		       cword.w8, info->chipwidth << CFI_FLASH_SHIFT_WIDTH);
+		flash_write8(cword.w8, addr);
 		break;
 	case FLASH_CFI_16BIT:
 		debug ("fwc addr %p cmd %x %4.4x 16bit x %d bit\n", addr,
-		       cmd, cword.w,
+		       cmd, cword.w16,
 		       info->chipwidth << CFI_FLASH_SHIFT_WIDTH);
-		flash_write16(cword.w, addr);
+		flash_write16(cword.w16, addr);
 		break;
 	case FLASH_CFI_32BIT:
-		debug ("fwc addr %p cmd %x %8.8lx 32bit x %d bit\n", addr,
-		       cmd, cword.l,
+		debug ("fwc addr %p cmd %x %8.8x 32bit x %d bit\n", addr,
+		       cmd, cword.w32,
 		       info->chipwidth << CFI_FLASH_SHIFT_WIDTH);
-		flash_write32(cword.l, addr);
+		flash_write32(cword.w32, addr);
 		break;
 	case FLASH_CFI_64BIT:
 #ifdef DEBUG
 		{
 			char str[20];
 
-			print_longlong (str, cword.ll);
+			print_longlong (str, cword.w64);
 
 			debug ("fwrite addr %p cmd %x %s 64 bit x %d bit\n",
 			       addr, cmd, str,
 			       info->chipwidth << CFI_FLASH_SHIFT_WIDTH);
 		}
 #endif
-		flash_write64(cword.ll, addr);
+		flash_write64(cword.w64, addr);
 		break;
 	}
 
@@ -393,16 +393,16 @@ static int flash_isequal (flash_info_t * info, flash_sect_t sect,
 	debug ("is= cmd %x(%c) addr %p ", cmd, cmd, addr);
 	switch (info->portwidth) {
 	case FLASH_CFI_8BIT:
-		debug ("is= %x %x\n", flash_read8(addr), cword.c);
-		retval = (flash_read8(addr) == cword.c);
+		debug ("is= %x %x\n", flash_read8(addr), cword.w8);
+		retval = (flash_read8(addr) == cword.w8);
 		break;
 	case FLASH_CFI_16BIT:
-		debug ("is= %4.4x %4.4x\n", flash_read16(addr), cword.w);
-		retval = (flash_read16(addr) == cword.w);
+		debug ("is= %4.4x %4.4x\n", flash_read16(addr), cword.w16);
+		retval = (flash_read16(addr) == cword.w16);
 		break;
 	case FLASH_CFI_32BIT:
-		debug ("is= %8.8x %8.8lx\n", flash_read32(addr), cword.l);
-		retval = (flash_read32(addr) == cword.l);
+		debug ("is= %8.8x %8.8x\n", flash_read32(addr), cword.w32);
+		retval = (flash_read32(addr) == cword.w32);
 		break;
 	case FLASH_CFI_64BIT:
 #ifdef DEBUG
@@ -411,11 +411,11 @@ static int flash_isequal (flash_info_t * info, flash_sect_t sect,
 			char str2[20];
 
 			print_longlong (str1, flash_read64(addr));
-			print_longlong (str2, cword.ll);
+			print_longlong (str2, cword.w64);
 			debug ("is= %s %s\n", str1, str2);
 		}
 #endif
-		retval = (flash_read64(addr) == cword.ll);
+		retval = (flash_read64(addr) == cword.w64);
 		break;
 	default:
 		retval = 0;
@@ -439,16 +439,16 @@ static int flash_isset (flash_info_t * info, flash_sect_t sect,
 	flash_make_cmd (info, cmd, &cword);
 	switch (info->portwidth) {
 	case FLASH_CFI_8BIT:
-		retval = ((flash_read8(addr) & cword.c) == cword.c);
+		retval = ((flash_read8(addr) & cword.w8) == cword.w8);
 		break;
 	case FLASH_CFI_16BIT:
-		retval = ((flash_read16(addr) & cword.w) == cword.w);
+		retval = ((flash_read16(addr) & cword.w16) == cword.w16);
 		break;
 	case FLASH_CFI_32BIT:
-		retval = ((flash_read32(addr) & cword.l) == cword.l);
+		retval = ((flash_read32(addr) & cword.w32) == cword.w32);
 		break;
 	case FLASH_CFI_64BIT:
-		retval = ((flash_read64(addr) & cword.ll) == cword.ll);
+		retval = ((flash_read64(addr) & cword.w64) == cword.w64);
 		break;
 	default:
 		retval = 0;
@@ -680,33 +680,33 @@ static void flash_add_byte (flash_info_t * info, cfiword_t * cword, uchar c)
 
 	switch (info->portwidth) {
 	case FLASH_CFI_8BIT:
-		cword->c = c;
+		cword->w8 = c;
 		break;
 	case FLASH_CFI_16BIT:
 #if defined(__LITTLE_ENDIAN) && !defined(CONFIG_SYS_WRITE_SWAPPED_DATA)
 		w = c;
 		w <<= 8;
-		cword->w = (cword->w >> 8) | w;
+		cword->w16 = (cword->w16 >> 8) | w;
 #else
-		cword->w = (cword->w << 8) | c;
+		cword->w16 = (cword->w16 << 8) | c;
 #endif
 		break;
 	case FLASH_CFI_32BIT:
 #if defined(__LITTLE_ENDIAN) && !defined(CONFIG_SYS_WRITE_SWAPPED_DATA)
 		l = c;
 		l <<= 24;
-		cword->l = (cword->l >> 8) | l;
+		cword->w32 = (cword->w32 >> 8) | l;
 #else
-		cword->l = (cword->l << 8) | c;
+		cword->w32 = (cword->w32 << 8) | c;
 #endif
 		break;
 	case FLASH_CFI_64BIT:
 #if defined(__LITTLE_ENDIAN) && !defined(CONFIG_SYS_WRITE_SWAPPED_DATA)
 		ll = c;
 		ll <<= 56;
-		cword->ll = (cword->ll >> 8) | ll;
+		cword->w64 = (cword->w64 >> 8) | ll;
 #else
-		cword->ll = (cword->ll << 8) | c;
+		cword->w64 = (cword->w64 << 8) | c;
 #endif
 		break;
 	}
@@ -753,16 +753,16 @@ static int flash_write_cfiword (flash_info_t * info, ulong dest,
 	/* Check if Flash is (sufficiently) erased */
 	switch (info->portwidth) {
 	case FLASH_CFI_8BIT:
-		flag = ((flash_read8(dstaddr) & cword.c) == cword.c);
+		flag = ((flash_read8(dstaddr) & cword.w8) == cword.w8);
 		break;
 	case FLASH_CFI_16BIT:
-		flag = ((flash_read16(dstaddr) & cword.w) == cword.w);
+		flag = ((flash_read16(dstaddr) & cword.w16) == cword.w16);
 		break;
 	case FLASH_CFI_32BIT:
-		flag = ((flash_read32(dstaddr) & cword.l) == cword.l);
+		flag = ((flash_read32(dstaddr) & cword.w32) == cword.w32);
 		break;
 	case FLASH_CFI_64BIT:
-		flag = ((flash_read64(dstaddr) & cword.ll) == cword.ll);
+		flag = ((flash_read64(dstaddr) & cword.w64) == cword.w64);
 		break;
 	default:
 		flag = 0;
@@ -800,16 +800,16 @@ static int flash_write_cfiword (flash_info_t * info, ulong dest,
 
 	switch (info->portwidth) {
 	case FLASH_CFI_8BIT:
-		flash_write8(cword.c, dstaddr);
+		flash_write8(cword.w8, dstaddr);
 		break;
 	case FLASH_CFI_16BIT:
-		flash_write16(cword.w, dstaddr);
+		flash_write16(cword.w16, dstaddr);
 		break;
 	case FLASH_CFI_32BIT:
-		flash_write32(cword.l, dstaddr);
+		flash_write32(cword.w32, dstaddr);
 		break;
 	case FLASH_CFI_64BIT:
-		flash_write64(cword.ll, dstaddr);
+		flash_write64(cword.w64, dstaddr);
 		break;
 	}
 
@@ -1115,7 +1115,7 @@ int flash_erase (flash_info_t * info, int s_first, int s_last)
 			if (use_flash_status_poll(info)) {
 				cfiword_t cword;
 				void *dest;
-				cword.ll = 0xffffffffffffffffULL;
+				cword.w64 = 0xffffffffffffffffULL;
 				dest = flash_map(info, sect, 0);
 				st = flash_status_poll(info, &cword, dest,
 						       info->erase_blk_tout, "erase");
@@ -1305,7 +1305,7 @@ int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 
 	/* handle unaligned start */
 	if ((aln = addr - wp) != 0) {
-		cword.l = 0;
+		cword.w32 = 0;
 		p = (uchar *)wp;
 		for (i = 0; i < aln; ++i)
 			flash_add_byte (info, &cword, flash_read8(p + i));
@@ -1332,7 +1332,7 @@ int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 	while (cnt >= info->portwidth) {
 		/* prohibit buffer write when buffer_size is 1 */
 		if (info->buffer_size == 1) {
-			cword.l = 0;
+			cword.w32 = 0;
 			for (i = 0; i < info->portwidth; i++)
 				flash_add_byte (info, &cword, *src++);
 			if ((rc = flash_write_cfiword (info, wp, cword)) != 0)
@@ -1359,7 +1359,7 @@ int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 	}
 #else
 	while (cnt >= info->portwidth) {
-		cword.l = 0;
+		cword.w32 = 0;
 		for (i = 0; i < info->portwidth; i++) {
 			flash_add_byte (info, &cword, *src++);
 		}
@@ -1381,7 +1381,7 @@ int write_buff (flash_info_t * info, uchar * src, ulong addr, ulong cnt)
 	/*
 	 * handle unaligned tail bytes
 	 */
-	cword.l = 0;
+	cword.w32 = 0;
 	p = (uchar *)wp;
 	for (i = 0; (i < info->portwidth) && (cnt > 0); ++i) {
 		flash_add_byte (info, &cword, *src++);

include/mtd/cfi_flash.h

@@ -105,10 +105,10 @@
 #define NUM_ERASE_REGIONS	4 /* max. number of erase regions */
 
 typedef union {
-	unsigned char c;
-	unsigned short w;
-	unsigned long l;
-	unsigned long long ll;
+	u8 w8;
+	u16 w16;
+	u32 w32;
+	u64 w64;
 } cfiword_t;
 
 /* CFI standard query structure */