ar71xx: ar934x_nfc: allow to control DMA data swap via platform data

Signed-off-by: Gabor Juhos <juhosg@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@34588 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/ar71xx/files/arch/mips/ath79/dev-nfc.c

@@ -80,6 +80,11 @@ void __init ath79_nfc_set_scan_fixup(int (*f)(struct mtd_info *mtd))
 	ath79_nfc_data.scan_fixup = f;
 }
 
+void __init ath79_nfc_set_swap_dma(bool enable)
+{
+	ath79_nfc_data.swap_dma = enable;
+}
+
 void __init ath79_nfc_set_parts(struct mtd_partition *parts, int nr_parts)
 {
 	ath79_nfc_data.parts = parts;

target/linux/ar71xx/files/arch/mips/ath79/dev-nfc.h

@@ -11,16 +11,20 @@
 #ifndef _ATH79_DEV_NFC_H
 #define _ATH79_DEV_NFC_H
 
+struct mtd_partition;
+
 #ifdef CONFIG_ATH79_DEV_NFC
 void ath79_nfc_set_parts(struct mtd_partition *parts, int nr_parts);
 void ath79_nfc_set_select_chip(void (*f)(int chip_no));
 void ath79_nfc_set_scan_fixup(int (*f)(struct mtd_info *mtd));
+void ath79_nfc_set_swap_dma(bool enable);
 void ath79_register_nfc(void);
 #else
 static inline void ath79_nfc_set_parts(struct mtd_partition *parts,
 				       int nr_parts) {}
 static inline void ath79_nfc_set_select_chip(void (*f)(int chip_no)) {}
 static inline void ath79_nfc_set_scan_fixup(int (*f)(struct mtd_info *mtd)) {}
+static inline void ath79_nfc_set_swap_dma(bool enable) {}
 static inline void ath79_register_nfc(void) {}
 #endif
 

target/linux/ar71xx/files/arch/mips/ath79/mach-rb2011.c

@@ -200,6 +200,7 @@ static void __init rb2011_nand_init(void)
 	ath79_nfc_set_parts(rb2011_nand_partitions,
 			    ARRAY_SIZE(rb2011_nand_partitions));
 	ath79_nfc_set_select_chip(rb2011_nand_select_chip);
+	ath79_nfc_set_swap_dma(true);
 	ath79_register_nfc();
 }
 

target/linux/ar71xx/files/drivers/mtd/nand/ar934x_nfc.c

@@ -174,6 +174,7 @@ struct ar934x_nfc {
 	struct device *parent;
 	void __iomem *base;
 	void (*select_chip)(int chip_no);
+	bool swap_dma;
 	int irq;
 	wait_queue_head_t irq_waitq;
 
@@ -190,6 +191,8 @@ struct ar934x_nfc {
 	unsigned int buf_size;
 	int buf_index;
 
+	bool read_id;
+
 	int erase1_page_addr;
 
 	int rndout_page_addr;
@@ -591,7 +594,10 @@ ar934x_nfc_read_status(struct ar934x_nfc *nfc)
 	nfc_dbg(nfc, "read status, cmd:%08x status:%02x\n",
 		cmd_reg, (status & 0xff));
 
-	nfc->buf[0 ^ 3] = status;
+	if (nfc->swap_dma)
+		nfc->buf[0 ^ 3] = status;
+	else
+		nfc->buf[0] = status;
 }
 
 static void
@@ -600,6 +606,7 @@ ar934x_nfc_cmdfunc(struct mtd_info *mtd, unsigned int command, int column,
 {
 	struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd);
 
+	nfc->read_id = false;
 	if (command != NAND_CMD_PAGEPROG)
 		nfc->buf_index = 0;
 
@@ -609,6 +616,7 @@ ar934x_nfc_cmdfunc(struct mtd_info *mtd, unsigned int command, int column,
 		break;
 
 	case NAND_CMD_READID:
+		nfc->read_id = true;
 		ar934x_nfc_send_readid(nfc, command);
 		break;
 
@@ -717,13 +725,15 @@ static u8
 ar934x_nfc_read_byte(struct mtd_info *mtd)
 {
 	struct ar934x_nfc *nfc = mtd_to_ar934x_nfc(mtd);
-	unsigned int buf_index;
 	u8 data;
 
 	WARN_ON(nfc->buf_index >= nfc->buf_size);
 
-	buf_index = nfc->buf_index ^ 3;
+	if (nfc->swap_dma || nfc->read_id)
-	data = nfc->buf[buf_index];
+		data = nfc->buf[nfc->buf_index ^ 3];
+	else
+		data = nfc->buf[nfc->buf_index];
+
 	nfc->buf_index++;
 
 	return data;
@@ -737,9 +747,16 @@ ar934x_nfc_write_buf(struct mtd_info *mtd, const u8 *buf, int len)
 
 	WARN_ON(nfc->buf_index + len > nfc->buf_size);
 
-	for (i = 0; i < len; i++) {
+	if (nfc->swap_dma) {
-		nfc->buf[nfc->buf_index ^ 3] = buf[i];
+		for (i = 0; i < len; i++) {
-		nfc->buf_index++;
+			nfc->buf[nfc->buf_index ^ 3] = buf[i];
+			nfc->buf_index++;
+		}
+	} else {
+		for (i = 0; i < len; i++) {
+			nfc->buf[nfc->buf_index] = buf[i];
+			nfc->buf_index++;
+		}
 	}
 }
 
@@ -754,9 +771,16 @@ ar934x_nfc_read_buf(struct mtd_info *mtd, u8 *buf, int len)
 
 	buf_index = nfc->buf_index;
 
-	for (i = 0; i < len; i++) {
+	if (nfc->swap_dma || nfc->read_id) {
-		buf[i] = nfc->buf[buf_index ^ 3];
+		for (i = 0; i < len; i++) {
-		buf_index++;
+			buf[i] = nfc->buf[buf_index ^ 3];
+			buf_index++;
+		}
+	} else {
+		for (i = 0; i < len; i++) {
+			buf[i] = nfc->buf[buf_index];
+			buf_index++;
+		}
 	}
 
 	nfc->buf_index = buf_index;
@@ -1028,6 +1052,7 @@ ar934x_nfc_probe(struct platform_device *pdev)
 
 	nfc->parent = &pdev->dev;
 	nfc->select_chip = pdata->select_chip;
+	nfc->swap_dma = pdata->swap_dma;
 
 	nand = &nfc->nand_chip;
 	mtd = &nfc->mtd;

target/linux/ar71xx/files/include/linux/platform/ar934x_nfc.h

@@ -22,6 +22,7 @@ struct ar934x_nfc_platform_data {
 	struct mtd_partition *parts;
 	int nr_parts;
 
+	bool swap_dma;
 	void (*hw_reset)(bool active);
 	void (*select_chip)(int chip_no);
 	int (*scan_fixup)(struct mtd_info *mtd);

target/linux/ar71xx/patches-3.6/a05-ar934x_nfc-add-buffer-verification.patch

@@ -1,6 +1,6 @@
 --- a/drivers/mtd/nand/ar934x_nfc.c
 +++ b/drivers/mtd/nand/ar934x_nfc.c
-@@ -762,6 +762,18 @@ ar934x_nfc_read_buf(struct mtd_info *mtd
+@@ -786,6 +786,18 @@ ar934x_nfc_read_buf(struct mtd_info *mtd
  	nfc->buf_index = buf_index;
  }
  
@@ -19,7 +19,7 @@
  static void
  ar934x_nfc_hw_init(struct ar934x_nfc *nfc)
  {
-@@ -1047,6 +1059,7 @@ ar934x_nfc_probe(struct platform_device
+@@ -1072,6 +1084,7 @@ ar934x_nfc_probe(struct platform_device
  	nand->read_byte = ar934x_nfc_read_byte;
  	nand->write_buf = ar934x_nfc_write_buf;
  	nand->read_buf = ar934x_nfc_read_buf;