linux-kernel - [PATCH v3 05/17] mtd: spinand: Define ctrl_ops for non-page read/write op templates

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Date:   Sat, 1 Jan 2022 13:12:38 +0530
From:   Apurva Nandan <a-nandan@...com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Mark Brown <broonie@...nel.org>,
        Apurva Nandan <a-nandan@...com>,
        Patrice Chotard <patrice.chotard@...s.st.com>,
        Christophe Kerello <christophe.kerello@...s.st.com>,
        Boris Brezillon <boris.brezillon@...labora.com>,
        Daniel Palmer <daniel@...f.com>,
        Alexander Lobakin <alobakin@...me>,
        <linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        <linux-spi@...r.kernel.org>
CC:     <p.yadav@...com>
Subject: [PATCH v3 05/17] mtd: spinand: Define ctrl_ops for non-page read/write op templates

'ctrl_ops' are op templates for non-page read/write operations,
which are: reset, get_feature, set_feature, write_enable, block_erase,
page_read and program_execute ops. The 'ctrl_ops' struct contains in it
op templates for each of this op, as well as enum spinand_protocol
denoting protocol of all these ops.

We require these new op templates because of deviation in standard
SPINAND ops by manufacturers and also due to changes when there is a
change in SPI protocol/mode. This prevents the core from live-patching
and vendor-specific adjustments in ops.

Define 'ctrl_ops', add macros to initialize it and add it in
spinand_device.

Signed-off-by: Apurva Nandan <a-nandan@...com>
---
 include/linux/mtd/spinand.h | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)

diff --git a/include/linux/mtd/spinand.h b/include/linux/mtd/spinand.h
index 439d8ce40e1d..e5df6220ec1e 100644
--- a/include/linux/mtd/spinand.h
+++ b/include/linux/mtd/spinand.h
@@ -356,6 +356,35 @@ struct spinand_op_variants {
 			sizeof(struct spi_mem_op),			\
 	}
 
+struct spinand_ctrl_ops {
+	const struct {
+		struct spi_mem_op reset;
+		struct spi_mem_op get_feature;
+		struct spi_mem_op set_feature;
+		struct spi_mem_op write_enable;
+		struct spi_mem_op block_erase;
+		struct spi_mem_op page_read;
+		struct spi_mem_op program_execute;
+	} ops;
+	const enum spinand_protocol protocol;
+};
+
+#define SPINAND_CTRL_OPS(__protocol, __reset, __get_feature, __set_feature,	\
+			 __write_enable, __block_erase, __page_read,		\
+			 __program_execute)					\
+	{									\
+		.ops = {							\
+			.reset = __reset,					\
+			.get_feature = __get_feature,				\
+			.set_feature = __set_feature,				\
+			.write_enable = __write_enable,				\
+			.block_erase = __block_erase,				\
+			.page_read = __page_read,				\
+			.program_execute = __program_execute,			\
+		},								\
+		.protocol = __protocol,						\
+	}
+
 /**
  * spinand_ecc_info - description of the on-die ECC implemented by a SPI NAND
  *		      chip
@@ -468,6 +497,8 @@ struct spinand_dirmap {
  * @data_ops.read_cache: read cache op template
  * @data_ops.write_cache: write cache op template
  * @data_ops.update_cache: update cache op template
+ * @ctrl_ops: various SPI mem op templates for handling the flash device, i.e.
+ *	      non page-read/write ops.
  * @select_target: select a specific target/die. Usually called before sending
  *		   a command addressing a page or an eraseblock embedded in
  *		   this die. Only required if your chip exposes several dies
@@ -498,6 +529,8 @@ struct spinand_device {
 		const struct spi_mem_op *update_cache;
 	} data_ops;
 
+	const struct spinand_ctrl_ops *ctrl_ops;
+
 	struct spinand_dirmap *dirmaps;
 
 	int (*select_target)(struct spinand_device *spinand,
-- 
2.25.1