mtd: nand: Add+use mtd_to/from_nand and nand_get/set_controller_data

These functions are part of the Linux 4.6 sync.  They are being added
before the main sync patch in order to make it easier to address the
issue across all NAND drivers (many/most of which do not closely track
their Linux counterparts) separately from other merge issues.

Signed-off-by: Scott Wood <oss@buserror.net>

1 files changed, 20 insertions, 14 deletions

diff --git a/drivers/mtd/nand/pxa3xx_nand.c b/drivers/mtd/nand/pxa3xx_nand.c
index 125dbe7fd3..03bf0468f1 100644
--- a/drivers/mtd/nand/pxa3xx_nand.c
+++ b/drivers/mtd/nand/pxa3xx_nand.c
@@ -900,7 +900,8 @@ static int prepare_set_command(struct pxa3xx_nand_info *info, int command,
 static void nand_cmdfunc(struct mtd_info *mtd, unsigned command,
 			 int column, int page_addr)
 {
-	struct pxa3xx_nand_host *host = mtd->priv;
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
 	struct pxa3xx_nand_info *info = host->info_data;
 	int exec_cmd;
 
@@ -960,7 +961,8 @@ static void nand_cmdfunc_extended(struct mtd_info *mtd,
 				  const unsigned command,
 				  int column, int page_addr)
 {
-	struct pxa3xx_nand_host *host = mtd->priv;
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
 	struct pxa3xx_nand_info *info = host->info_data;
 	int exec_cmd, ext_cmd_type;
 
@@ -1091,7 +1093,7 @@ static int pxa3xx_nand_read_page_hwecc(struct mtd_info *mtd,
 		struct nand_chip *chip, uint8_t *buf, int oob_required,
 		int page)
 {
-	struct pxa3xx_nand_host *host = mtd->priv;
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
 	struct pxa3xx_nand_info *info = host->info_data;
 
 	chip->read_buf(mtd, buf, mtd->writesize);
@@ -1117,7 +1119,8 @@ static int pxa3xx_nand_read_page_hwecc(struct mtd_info *mtd,
 
 static uint8_t pxa3xx_nand_read_byte(struct mtd_info *mtd)
 {
-	struct pxa3xx_nand_host *host = mtd->priv;
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
 	struct pxa3xx_nand_info *info = host->info_data;
 	char retval = 0xFF;
 
@@ -1130,7 +1133,8 @@ static uint8_t pxa3xx_nand_read_byte(struct mtd_info *mtd)
 
 static u16 pxa3xx_nand_read_word(struct mtd_info *mtd)
 {
-	struct pxa3xx_nand_host *host = mtd->priv;
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
 	struct pxa3xx_nand_info *info = host->info_data;
 	u16 retval = 0xFFFF;
 
@@ -1143,7 +1147,8 @@ static u16 pxa3xx_nand_read_word(struct mtd_info *mtd)
 
 static void pxa3xx_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
 {
-	struct pxa3xx_nand_host *host = mtd->priv;
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
 	struct pxa3xx_nand_info *info = host->info_data;
 	int real_len = min_t(size_t, len, info->buf_count - info->buf_start);
 
@@ -1154,7 +1159,8 @@ static void pxa3xx_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
 static void pxa3xx_nand_write_buf(struct mtd_info *mtd,
 		const uint8_t *buf, int len)
 {
-	struct pxa3xx_nand_host *host = mtd->priv;
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
 	struct pxa3xx_nand_info *info = host->info_data;
 	int real_len = min_t(size_t, len, info->buf_count - info->buf_start);
 
@@ -1169,7 +1175,8 @@ static void pxa3xx_nand_select_chip(struct mtd_info *mtd, int chip)
 
 static int pxa3xx_nand_waitfunc(struct mtd_info *mtd, struct nand_chip *this)
 {
-	struct pxa3xx_nand_host *host = mtd->priv;
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
 	struct pxa3xx_nand_info *info = host->info_data;
 
 	if (info->need_wait) {
@@ -1210,7 +1217,7 @@ static int pxa3xx_nand_config_flash(struct pxa3xx_nand_info *info)
 {
 	struct pxa3xx_nand_host *host = info->host[info->cs];
 	struct mtd_info *mtd = host->mtd;
-	struct nand_chip *chip = mtd->priv;
+	struct nand_chip *chip = mtd_to_nand(mtd);
 
 	info->reg_ndcr |= (host->col_addr_cycles == 2) ? NDCR_RA_START : 0;
 	info->reg_ndcr |= (chip->page_shift == 6) ? NDCR_PG_PER_BLK : 0;
@@ -1262,7 +1269,7 @@ static int pxa3xx_nand_sensing(struct pxa3xx_nand_host *host)
 	int ret;
 
 	mtd = info->host[info->cs]->mtd;
-	chip = mtd->priv;
+	chip = mtd_to_nand(mtd);
 
 	/* configure default flash values */
 	info->reg_ndcr = 0x0; /* enable all interrupts */
@@ -1354,10 +1361,10 @@ static int pxa_ecc_init(struct pxa3xx_nand_info *info,
 
 static int pxa3xx_nand_scan(struct mtd_info *mtd)
 {
-	struct pxa3xx_nand_host *host = mtd->priv;
+	struct nand_chip *chip = mtd_to_nand(mtd);
+	struct pxa3xx_nand_host *host = nand_get_controller_data(chip);
 	struct pxa3xx_nand_info *info = host->info_data;
 	struct pxa3xx_nand_platform_data *pdata = info->pdata;
-	struct nand_chip *chip = mtd->priv;
 	int ret;
 	uint16_t ecc_strength, ecc_step;
 
@@ -1479,14 +1486,13 @@ static int alloc_nand_resource(struct pxa3xx_nand_info *info)
 	for (cs = 0; cs < pdata->num_cs; cs++) {
 		chip = (struct nand_chip *)
 			((u8 *)&info[1] + sizeof(*host) * cs);
-		mtd = &chip->mtd;
+		mtd = nand_to_mtd(chip);
 		host = (struct pxa3xx_nand_host *)chip;
 		info->host[cs] = host;
 		host->mtd = mtd;
 		host->cs = cs;
 		host->info_data = info;
 		host->read_id_bytes = 4;
-		mtd->priv = host;
 		mtd->owner = THIS_MODULE;
 
 		chip->ecc.read_page	= pxa3xx_nand_read_page_hwecc;