[PATCH 05/23] mtd: spi-nor: Add the concept of SPI NOR manufacturer driver

From: <Tudor.Ambarus@microchip.com>
To: <bbrezillon@kernel.org>, <vigneshr@ti.com>,
	<linux-mtd@lists.infradead.org>
Cc: <miquel.raynal@bootlin.com>, <richard@nod.at>, <joel@jms.id.au>,
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	<alexandre.belloni@bootlin.com>,
	<Ludovic.Desroches@microchip.com>, <matthias.bgg@gmail.com>,
	<vz@mleia.com>, <michal.simek@xilinx.com>, <ludovic.barre@st.com>,
	<john.garry@huawei.com>, <tglx@linutronix.de>,
	<nishkadg.linux@gmail.com>, <michael@walle.cc>,
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	<linux-mediatek@lists.infradead.org>,
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	<Tudor.Ambarus@microchip.com>
Subject: [PATCH 05/23] mtd: spi-nor: Add the concept of SPI NOR manufacturer driver
Date: Mon, 2 Mar 2020 18:07:47 +0000	[thread overview]
Message-ID: <20200302180730.1886678-6-tudor.ambarus@microchip.com> (raw)
In-Reply-To: <20200302180730.1886678-1-tudor.ambarus@microchip.com>

From: Boris Brezillon <bbrezillon@kernel.org>

Declare a spi_nor_manufacturer struct and add basic building blocks to
move manufacturer specific code outside of the core.

Signed-off-by: Boris Brezillon <bbrezillon@kernel.org>
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
---
 drivers/mtd/spi-nor/core.c  | 78 +++++++++++++++++++++++++++++++------
 drivers/mtd/spi-nor/core.h  | 14 +++++++
 include/linux/mtd/spi-nor.h |  8 ++++
 3 files changed, 89 insertions(+), 11 deletions(-)

diff --git a/drivers/mtd/spi-nor/core.c b/drivers/mtd/spi-nor/core.c
index 16cf9d4b1a73..d41ef1795707 100644
--- a/drivers/mtd/spi-nor/core.c
+++ b/drivers/mtd/spi-nor/core.c
@@ -2472,8 +2472,26 @@ static const struct flash_info spi_nor_ids[] = {
 	{ },
 };
 
+static const struct spi_nor_manufacturer *manufacturers[0];
+
+static const struct flash_info *
+spi_nor_search_part_by_id(const struct flash_info *parts, unsigned int nparts,
+			  const u8 *id)
+{
+	unsigned int i;
+
+	for (i = 0; i < nparts; i++) {
+		if (parts[i].id_len &&
+		    !memcmp(parts[i].id, id, parts[i].id_len))
+			return &parts[i];
+	}
+
+	return NULL;
+}
+
 static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
 {
+	const struct flash_info *info;
 	u8 *id = nor->bouncebuf;
 	unsigned int i;
 	int ret;
@@ -2495,11 +2513,21 @@ static const struct flash_info *spi_nor_read_id(struct spi_nor *nor)
 		return ERR_PTR(ret);
 	}
 
-	for (i = 0; i < ARRAY_SIZE(spi_nor_ids) - 1; i++) {
-		if (spi_nor_ids[i].id_len &&
-		    !memcmp(spi_nor_ids[i].id, id, spi_nor_ids[i].id_len))
-			return &spi_nor_ids[i];
+	for (i = 0; i < ARRAY_SIZE(manufacturers); i++) {
+		info = spi_nor_search_part_by_id(manufacturers[i]->parts,
+						 manufacturers[i]->nparts,
+						 id);
+		if (info) {
+			nor->manufacturer = manufacturers[i];
+			return info;
+		}
 	}
+
+	info = spi_nor_search_part_by_id(spi_nor_ids,
+					 ARRAY_SIZE(spi_nor_ids) - 1, id);
+	if (info)
+		return info;
+
 	dev_err(nor->dev, "unrecognized JEDEC id bytes: %*ph\n",
 		SPI_NOR_MAX_ID_LEN, id);
 	return ERR_PTR(-ENODEV);
@@ -2985,6 +3013,16 @@ int spi_nor_post_bfpt_fixups(struct spi_nor *nor,
 			     const struct sfdp_bfpt *bfpt,
 			     struct spi_nor_flash_parameter *params)
 {
+	int ret;
+
+	if (nor->manufacturer && nor->manufacturer->fixups &&
+	    nor->manufacturer->fixups->post_bfpt) {
+		ret = nor->manufacturer->fixups->post_bfpt(nor, bfpt_header,
+							   bfpt, params);
+		if (ret)
+			return ret;
+	}
+
 	if (nor->info->fixups && nor->info->fixups->post_bfpt)
 		return nor->info->fixups->post_bfpt(nor, bfpt_header, bfpt,
 						    params);
@@ -3294,6 +3332,10 @@ static void spi_nor_manufacturer_init_params(struct spi_nor *nor)
 		break;
 	}
 
+	if (nor->manufacturer && nor->manufacturer->fixups &&
+	    nor->manufacturer->fixups->default_init)
+		nor->manufacturer->fixups->default_init(nor);
+
 	if (nor->info->fixups && nor->info->fixups->default_init)
 		nor->info->fixups->default_init(nor);
 }
@@ -3453,6 +3495,10 @@ static void spi_nor_post_sfdp_fixups(struct spi_nor *nor)
 	if (nor->info->flags & SPI_S3AN)
 		s3an_post_sfdp_fixups(nor);
 
+	if (nor->manufacturer && nor->manufacturer->fixups &&
+	    nor->manufacturer->fixups->post_sfdp)
+		nor->manufacturer->fixups->post_sfdp(nor);
+
 	if (nor->info->fixups && nor->info->fixups->post_sfdp)
 		nor->info->fixups->post_sfdp(nor);
 }
@@ -3615,15 +3661,25 @@ void spi_nor_restore(struct spi_nor *nor)
 }
 EXPORT_SYMBOL_GPL(spi_nor_restore);
 
-static const struct flash_info *spi_nor_match_id(const char *name)
+static const struct flash_info *spi_nor_match_id(struct spi_nor *nor,
+						 const char *name)
 {
-	const struct flash_info *id = spi_nor_ids;
+	unsigned int i, j;
 
-	while (id->name) {
-		if (!strcmp(name, id->name))
-			return id;
-		id++;
+	for (i = 0; i < ARRAY_SIZE(spi_nor_ids) - 1; i++) {
+		if (!strcmp(name, spi_nor_ids[i].name))
+			return &spi_nor_ids[i];
 	}
+
+	for (i = 0; i < ARRAY_SIZE(manufacturers); i++) {
+		for (j = 0; j < manufacturers[i]->nparts; j++) {
+			if (!strcmp(name, manufacturers[i]->parts[j].name)) {
+				nor->manufacturer = manufacturers[i];
+				return &manufacturers[i]->parts[j];
+			}
+		}
+	}
+
 	return NULL;
 }
 
@@ -3670,7 +3726,7 @@ static const struct flash_info *spi_nor_get_flash_info(struct spi_nor *nor,
 	const struct flash_info *info = NULL;
 
 	if (name)
-		info = spi_nor_match_id(name);
+		info = spi_nor_match_id(nor, name);
 	/* Try to auto-detect if chip name wasn't specified or not found */
 	if (!info)
 		info = spi_nor_read_id(nor);
diff --git a/drivers/mtd/spi-nor/core.h b/drivers/mtd/spi-nor/core.h
index 7e2d88edf1f1..89b8dd1c8213 100644
--- a/drivers/mtd/spi-nor/core.h
+++ b/drivers/mtd/spi-nor/core.h
@@ -152,6 +152,20 @@ struct flash_info {
 		.addr_width = 3,					\
 		.flags = SPI_NOR_NO_FR | SPI_S3AN,
 
+/**
+ * struct spi_nor_manufacturer - SPI NOR manufacturer object
+ * @name: manufacturer name
+ * @parts: array of parts supported by this manufacturer
+ * @nparts: number of entries in the parts array
+ * @fixups: hooks called at various points in time during spi_nor_scan()
+ */
+struct spi_nor_manufacturer {
+	const char *name;
+	const struct flash_info *parts;
+	unsigned int nparts;
+	const struct spi_nor_fixups *fixups;
+};
+
 int spi_nor_write_enable(struct spi_nor *nor);
 int spi_nor_write_disable(struct spi_nor *nor);
 int spi_nor_en4_ex4_set_4byte(struct spi_nor *nor, bool enable);
diff --git a/include/linux/mtd/spi-nor.h b/include/linux/mtd/spi-nor.h
index de90724f62f1..dde2988a809e 100644
--- a/include/linux/mtd/spi-nor.h
+++ b/include/linux/mtd/spi-nor.h
@@ -554,6 +554,12 @@ struct spi_nor_flash_parameter {
  */
 struct flash_info;
 
+/**
+ * struct spi_nor_manufacturer - Forward declaration of a structure used
+ * internally by the core and manufacturer drivers.
+ */
+struct spi_nor_manufacturer;
+
 /**
  * struct spi_nor - Structure for defining a the SPI NOR layer
  * @mtd:		point to a mtd_info structure
@@ -564,6 +570,7 @@ struct flash_info;
  *                      layer is not DMA-able
  * @bouncebuf_size:	size of the bounce buffer
  * @info:		spi-nor part JDEC MFR id and other info
+ * @manufacturer:	spi-nor manufacturer
  * @page_size:		the page size of the SPI NOR
  * @addr_width:		number of address bytes
  * @erase_opcode:	the opcode for erasing a sector
@@ -591,6 +598,7 @@ struct spi_nor {
 	u8			*bouncebuf;
 	size_t			bouncebuf_size;
 	const struct flash_info	*info;
+	const struct spi_nor_manufacturer *manufacturer;
 	u32			page_size;
 	u8			addr_width;
 	u8			erase_opcode;
-- 
2.23.0
