mtd: spi-nor: Use nor->params

The Flash parameters and settings are now stored in 'struct spi_nor'.
Use this instead of the stack allocated params.

Few functions stop passing pointer to params, as they can get it from
'struct spi_nor'. spi_nor_parse_sfdp() and children will keep passing
pointer to params because of the roll-back mechanism: in case the
parsing of SFDP fails, the legacy flash parameter and settings will be
restored.

Zeroing params is no longer needed because all SPI NOR users kzalloc
'struct spi_nor'.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Vignesh Raghavendra <vigneshr@ti.com>

Author: ambarus

drivers/mtd/spi-nor/spi-nor.c

@@ -2974,16 +2974,13 @@ static int spi_nor_spimem_check_pp(struct spi_nor *nor,
  * spi_nor_spimem_adjust_hwcaps - Find optimal Read/Write protocol
  *                                based on SPI controller capabilities
  * @nor:        pointer to a 'struct spi_nor'
- * @params:     pointer to the 'struct spi_nor_flash_parameter'
- *              representing SPI NOR flash capabilities
  * @hwcaps:     pointer to resulting capabilities after adjusting
  *              according to controller and flash's capability
  */
 static void
-spi_nor_spimem_adjust_hwcaps(struct spi_nor *nor,
-			     const struct spi_nor_flash_parameter *params,
-			     u32 *hwcaps)
+spi_nor_spimem_adjust_hwcaps(struct spi_nor *nor, u32 *hwcaps)
 {
+	struct spi_nor_flash_parameter *params =  &nor->params;
 	unsigned int cap;
 
 	/* DTR modes are not supported yet, mask them all. */
@@ -4129,16 +4126,13 @@ static int spi_nor_parse_sfdp(struct spi_nor *nor,
 	return err;
 }
 
-static int spi_nor_init_params(struct spi_nor *nor,
-			       struct spi_nor_flash_parameter *params)
+static int spi_nor_init_params(struct spi_nor *nor)
 {
+	struct spi_nor_flash_parameter *params = &nor->params;
 	struct spi_nor_erase_map *map = &nor->erase_map;
 	const struct flash_info *info = nor->info;
 	u8 i, erase_mask;
 
-	/* Set legacy flash parameters as default. */
-	memset(params, 0, sizeof(*params));
-
 	/* Set SPI NOR sizes. */
 	params->size = (u64)info->sector_size * info->n_sectors;
 	params->page_size = info->page_size;
@@ -4255,7 +4249,6 @@ static int spi_nor_init_params(struct spi_nor *nor,
 }
 
 static int spi_nor_select_read(struct spi_nor *nor,
-			       const struct spi_nor_flash_parameter *params,
 			       u32 shared_hwcaps)
 {
 	int cmd, best_match = fls(shared_hwcaps & SNOR_HWCAPS_READ_MASK) - 1;
@@ -4268,7 +4261,7 @@ static int spi_nor_select_read(struct spi_nor *nor,
 	if (cmd < 0)
 		return -EINVAL;
 
-	read = &params->reads[cmd];
+	read = &nor->params.reads[cmd];
 	nor->read_opcode = read->opcode;
 	nor->read_proto = read->proto;
 
@@ -4287,7 +4280,6 @@ static int spi_nor_select_read(struct spi_nor *nor,
 }
 
 static int spi_nor_select_pp(struct spi_nor *nor,
-			     const struct spi_nor_flash_parameter *params,
 			     u32 shared_hwcaps)
 {
 	int cmd, best_match = fls(shared_hwcaps & SNOR_HWCAPS_PP_MASK) - 1;
@@ -4300,7 +4292,7 @@ static int spi_nor_select_pp(struct spi_nor *nor,
 	if (cmd < 0)
 		return -EINVAL;
 
-	pp = &params->page_programs[cmd];
+	pp = &nor->params.page_programs[cmd];
 	nor->program_opcode = pp->opcode;
 	nor->write_proto = pp->proto;
 	return 0;
@@ -4407,9 +4399,9 @@ static int spi_nor_select_erase(struct spi_nor *nor, u32 wanted_size)
 }
 
 static int spi_nor_setup(struct spi_nor *nor,
-			 const struct spi_nor_flash_parameter *params,
 			 const struct spi_nor_hwcaps *hwcaps)
 {
+	struct spi_nor_flash_parameter *params = &nor->params;
 	u32 ignored_mask, shared_mask;
 	bool enable_quad_io;
 	int err;
@@ -4426,7 +4418,7 @@ static int spi_nor_setup(struct spi_nor *nor,
 		 * need to discard some of them based on what the SPI
 		 * controller actually supports (using spi_mem_supports_op()).
 		 */
-		spi_nor_spimem_adjust_hwcaps(nor, params, &shared_mask);
+		spi_nor_spimem_adjust_hwcaps(nor, &shared_mask);
 	} else {
 		/*
 		 * SPI n-n-n protocols are not supported when the SPI
@@ -4442,15 +4434,15 @@ static int spi_nor_setup(struct spi_nor *nor,
 	}
 
 	/* Select the (Fast) Read command. */
-	err = spi_nor_select_read(nor, params, shared_mask);
+	err = spi_nor_select_read(nor, shared_mask);
 	if (err) {
 		dev_err(nor->dev,
 			"can't select read settings supported by both the SPI controller and memory.\n");
 		return err;
 	}
 
 	/* Select the Page Program command. */
-	err = spi_nor_select_pp(nor, params, shared_mask);
+	err = spi_nor_select_pp(nor, shared_mask);
 	if (err) {
 		dev_err(nor->dev,
 			"can't select write settings supported by both the SPI controller and memory.\n");
@@ -4553,11 +4545,11 @@ static const struct flash_info *spi_nor_match_id(const char *name)
 int spi_nor_scan(struct spi_nor *nor, const char *name,
 		 const struct spi_nor_hwcaps *hwcaps)
 {
-	struct spi_nor_flash_parameter params;
 	const struct flash_info *info = NULL;
 	struct device *dev = nor->dev;
 	struct mtd_info *mtd = &nor->mtd;
 	struct device_node *np = spi_nor_get_flash_node(nor);
+	struct spi_nor_flash_parameter *params = &nor->params;
 	int ret;
 	int i;
 
@@ -4639,7 +4631,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 		nor->clear_sr_bp = spi_nor_clear_sr_bp;
 
 	/* Parse the Serial Flash Discoverable Parameters table. */
-	ret = spi_nor_init_params(nor, &params);
+	ret = spi_nor_init_params(nor);
 	if (ret)
 		return ret;
 
@@ -4649,7 +4641,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 	mtd->type = MTD_NORFLASH;
 	mtd->writesize = 1;
 	mtd->flags = MTD_CAP_NORFLASH;
-	mtd->size = params.size;
+	mtd->size = params->size;
 	mtd->_erase = spi_nor_erase;
 	mtd->_read = spi_nor_read;
 	mtd->_resume = spi_nor_resume;
@@ -4688,26 +4680,26 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 		mtd->flags |= MTD_NO_ERASE;
 
 	mtd->dev.parent = dev;
-	nor->page_size = params.page_size;
+	nor->page_size = params->page_size;
 	mtd->writebufsize = nor->page_size;
 
 	if (np) {
 		/* If we were instantiated by DT, use it */
 		if (of_property_read_bool(np, "m25p,fast-read"))
-			params.hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
+			params->hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
 		else
-			params.hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
+			params->hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
 	} else {
 		/* If we weren't instantiated by DT, default to fast-read */
-		params.hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
+		params->hwcaps.mask |= SNOR_HWCAPS_READ_FAST;
 	}
 
 	if (of_property_read_bool(np, "broken-flash-reset"))
 		nor->flags |= SNOR_F_BROKEN_RESET;
 
 	/* Some devices cannot do fast-read, no matter what DT tells us */
 	if (info->flags & SPI_NOR_NO_FR)
-		params.hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
+		params->hwcaps.mask &= ~SNOR_HWCAPS_READ_FAST;
 
 	/*
 	 * Configure the SPI memory:
@@ -4716,7 +4708,7 @@ int spi_nor_scan(struct spi_nor *nor, const char *name,
 	 * - set the SPI protocols for register and memory accesses.
 	 * - set the Quad Enable bit if needed (required by SPI x-y-4 protos).
 	 */
-	ret = spi_nor_setup(nor, &params, hwcaps);
+	ret = spi_nor_setup(nor, hwcaps);
 	if (ret)
 		return ret;