[PATCH] cfi_flash: support of u32 cmd

[Teresa Gámez]

Some NOR flash chips have commands with length greater than the maximum
value size of uchar.

Based on an U-Boot Patch by Vasiliy Leoenenko <vasiliy.leonenko at mail.ru>

Only tested with little endian on an intel cfi_flash.

Signed-off-by: Teresa Gámez <t.gamez at phytec.de>
---
 drivers/nor/cfi_flash.c       |   38 +++++++++++++++++++++++++++++---------
 drivers/nor/cfi_flash.h       |   11 +++++++----
 drivers/nor/cfi_flash_amd.c   |    8 ++++----
 drivers/nor/cfi_flash_intel.c |    2 +-
 4 files changed, 41 insertions(+), 18 deletions(-)

diff --git a/drivers/nor/cfi_flash.c b/drivers/nor/cfi_flash.c
index 461b0e6..489c15d 100644
--- a/drivers/nor/cfi_flash.c
+++ b/drivers/nor/cfi_flash.c
@@ -820,20 +820,38 @@ int flash_generic_status_check (struct flash_info *info, flash_sect_t sector,
 /*
  * make a proper sized command based on the port and chip widths
  */
-void flash_make_cmd(struct flash_info *info, u8 cmd, cfiword_t *cmdbuf)
+void flash_make_cmd(struct flash_info *info, u32 cmd, cfiword_t *cmdbuf)
 {
-	cfiword_t result = 0;
-	int i = info->portwidth / info->chipwidth;
+	int i;
+	int cp_offset;
+	int cword_offset;
+	uchar val;
+	uchar *cp;
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+	u32 cmd_le = cpu_to_le32(cmd);
+#endif
+
+	*cmdbuf = 0;
+	cp = (uchar *)cmdbuf;
 
-	while (i--)
-		result = (result << (8 * info->chipwidth)) | cmd;
-	*cmdbuf = result;
+	for (i = info->portwidth; i > 0; i--) {
+		cword_offset = (info->portwidth-i) % info->chipwidth;
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+		cp_offset = info->portwidth - i;
+		val = *((uchar *)&cmd_le + cword_offset);
+#else
+		cp_offset = i - 1;
+		val = *((uchar *)&cmd + sizeof(u32) - cword_offset - 1);
+#endif
+	cp[cp_offset] = (cword_offset >= sizeof(u32)) ? 0x00 : val;
+	}
 }
 
 /*
  * Write a proper sized command to the correct address
  */
-void flash_write_cmd (struct flash_info *info, flash_sect_t sect, uint offset, uchar cmd)
+void flash_write_cmd(struct flash_info *info, flash_sect_t sect,
+				uint offset, u32 cmd)
 {
 
 	uchar *addr;
@@ -845,7 +863,8 @@ void flash_write_cmd (struct flash_info *info, flash_sect_t sect, uint offset, u
 	flash_write_word(info, cword, addr);
 }
 
-int flash_isequal (struct flash_info *info, flash_sect_t sect, uint offset, uchar cmd)
+int flash_isequal(struct flash_info *info, flash_sect_t sect,
+				uint offset, u32 cmd)
 {
 	void *addr;
 	cfiword_t cword;
@@ -882,7 +901,8 @@ int flash_isequal (struct flash_info *info, flash_sect_t sect, uint offset, ucha
 	return retval;
 }
 
-int flash_isset (struct flash_info *info, flash_sect_t sect, uint offset, uchar cmd)
+int flash_isset(struct flash_info *info, flash_sect_t sect,
+				uint offset, u32 cmd)
 {
 	void *addr = flash_make_addr (info, sect, offset);
 	cfiword_t cword;
diff --git a/drivers/nor/cfi_flash.h b/drivers/nor/cfi_flash.h
index 9098021..32dcc8c 100644
--- a/drivers/nor/cfi_flash.h
+++ b/drivers/nor/cfi_flash.h
@@ -231,16 +231,19 @@ extern struct cfi_cmd_set cfi_cmd_set_amd;
 #define CFI_FLASH_SHIFT_WIDTH	3
 /* Prototypes */
 
-int flash_isset (struct flash_info *info, flash_sect_t sect, uint offset, uchar cmd);
-void flash_write_cmd (struct flash_info *info, flash_sect_t sect, uint offset, uchar cmd);
+int flash_isset(struct flash_info *info, flash_sect_t sect,
+				uint offset, u32 cmd);
+void flash_write_cmd(struct flash_info *info, flash_sect_t sect,
+				uint offset, u32 cmd);
 flash_sect_t find_sector (struct flash_info *info, ulong addr);
 int flash_status_check (struct flash_info *info, flash_sect_t sector,
 			       uint64_t tout, char *prompt);
 int flash_generic_status_check (struct flash_info *info, flash_sect_t sector,
 			       uint64_t tout, char *prompt);
 
-int flash_isequal (struct flash_info *info, flash_sect_t sect, uint offset, uchar cmd);
-void flash_make_cmd(struct flash_info *info, uchar cmd, cfiword_t *cmdbuf);
+int flash_isequal(struct flash_info *info, flash_sect_t sect,
+				uint offset, u32 cmd);
+void flash_make_cmd(struct flash_info *info, u32 cmd, cfiword_t *cmdbuf);
 
 static inline void flash_write8(u8 value, void *addr)
 {
diff --git a/drivers/nor/cfi_flash_amd.c b/drivers/nor/cfi_flash_amd.c
index b1d7070..45c59b9 100644
--- a/drivers/nor/cfi_flash_amd.c
+++ b/drivers/nor/cfi_flash_amd.c
@@ -142,28 +142,28 @@ static int amd_flash_write_cfibuffer (struct flash_info *info, ulong dest, const
 
 	if (bankwidth_is_1(info)) {
 		cnt = len;
-		flash_write_cmd (info, sector, 0,  (uchar) cnt - 1);
+		flash_write_cmd(info, sector, 0, (u32)cnt - 1);
 		while (cnt-- > 0) {
 			flash_write8(flash_read8(src), dst);
 			src += 1, dst += 1;
 		}
 	} else if (bankwidth_is_2(info)) {
 		cnt = len >> 1;
-		flash_write_cmd (info, sector, 0,  (uchar) cnt - 1);
+		flash_write_cmd(info, sector, 0, (u32)cnt - 1);
 		while (cnt-- > 0) {
 			flash_write16(flash_read16(src), dst);
 			src += 2, dst += 2;
 		}
 	} else if (bankwidth_is_4(info)) {
 		cnt = len >> 2;
-		flash_write_cmd (info, sector, 0,  (uchar) cnt - 1);
+		flash_write_cmd(info, sector, 0, (u32)cnt - 1);
 		while (cnt-- > 0) {
 			flash_write32(flash_read32(src), dst);
 			src += 4, dst += 4;
 		}
 	} else if (bankwidth_is_8(info)) {
 		cnt = len >> 3;
-		flash_write_cmd (info, sector, 0,  (uchar) cnt - 1);
+		flash_write_cmd(info, sector, 0, (u32)cnt - 1);
 		while (cnt-- > 0) {
 			flash_write64(flash_read64(src), dst);
 			src += 8, dst += 8;
diff --git a/drivers/nor/cfi_flash_intel.c b/drivers/nor/cfi_flash_intel.c
index c3cbad5..6318cfe 100644
--- a/drivers/nor/cfi_flash_intel.c
+++ b/drivers/nor/cfi_flash_intel.c
@@ -70,7 +70,7 @@ static int intel_flash_write_cfibuffer (struct flash_info *info, ulong dest, con
 	/* reduce the number of loops by the width of the port	*/
 	cnt = len >> (info->portwidth - 1);
 
-	flash_write_cmd (info, sector, 0, (uchar) cnt - 1);
+	flash_write_cmd(info, sector, 0, (u32)cnt - 1);
 	while (cnt-- > 0) {
 		if (bankwidth_is_1(info)) {
 			flash_write8(flash_read8(src), dst);
-- 
1.7.0.4