linux-kernel - [PATCH 10/47] mtd: nand: stm_nand_bch: introduce and initialise some important data structures

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Date:	Thu,  1 May 2014 10:56:17 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	linux-kernel@...r.kernel.org
Cc:	computersforpeace@...il.com, linux-mtd@...ts.infradead.org,
	kernel@...inux.com, Lee Jones <lee.jones@...aro.org>
Subject: [PATCH 10/47] mtd: nand: stm_nand_bch: introduce and initialise some important data structures

Provide some more in-depth structures which will be used heavily within
the driver. We also add a convenience function, used to set the default
values.

Signed-off-by: Lee Jones <lee.jones@...aro.org>
---
 drivers/mtd/nand/stm_nand_bch.c | 67 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 67 insertions(+)

diff --git a/drivers/mtd/nand/stm_nand_bch.c b/drivers/mtd/nand/stm_nand_bch.c
index 8e28da0..19d090c 100644
--- a/drivers/mtd/nand/stm_nand_bch.c
+++ b/drivers/mtd/nand/stm_nand_bch.c
@@ -21,10 +21,30 @@
 #include <linux/device.h>
 #include <linux/platform_device.h>
 #include <linux/completion.h>
+#include <linux/mtd/nand.h>
 #include <linux/mtd/stm_nand.h>
 
 #include "stm_nand_regs.h"
 
+/* Bad Block Table (BBT) */
+struct nandi_bbt_info {
+	uint32_t	bbt_size;		/* Size of bad-block table */
+	uint32_t	bbt_vers[2];		/* Version (Primary/Mirror) */
+	uint32_t	bbt_block[2];		/* Block No. (Primary/Mirror) */
+	uint8_t		*bbt;			/* Table data */
+};
+
+/* Collection of MTD/NAND device information */
+struct nandi_info {
+	struct mtd_info		mtd;		/* MTD info */
+	struct nand_chip	chip;		/* NAND chip info */
+
+	struct nand_ecclayout	ecclayout;	/* MTD ECC layout */
+	struct nandi_bbt_info	bbt_info;	/* Bad Block Table */
+	int			nr_parts;	/* Number of MTD partitions */
+	struct	mtd_partition	*parts;		/* MTD partitions */
+};
+
 /* NANDi Controller (Hamming/BCH) */
 struct nandi_controller {
 	void __iomem		*base;		/* Controller base*/
@@ -60,6 +80,8 @@ struct nandi_controller {
 
 	int			cached_page;	/* page number of page in */
 						/* 'page_buf'             */
+
+	struct nandi_info	info;		/* NAND device info */
 };
 
 /* ONFI define 6 timing modes */
@@ -274,6 +296,37 @@ static void nandi_disable_interrupts(struct nandi_controller *nandi,
 	writel(val, nandi->base + NANDBCH_INT_EN);
 }
 
+static void nandi_set_mtd_defaults(struct nandi_controller *nandi,
+				   struct mtd_info *mtd, struct nand_chip *chip)
+{
+	struct nandi_info *info = &nandi->info;
+	int i;
+
+	/* ecclayout */
+	info->ecclayout.eccbytes = mtd->oobsize;
+	for (i = 0; i < 64; i++)
+		info->ecclayout.eccpos[i] = i;
+	info->ecclayout.oobfree[0].offset = 0;
+	info->ecclayout.oobfree[0].length = 0;
+	chip->ecc.mode = NAND_ECC_HW
+
+	/* nand_chip */
+	chip->controller = &chip->hwcontrol;
+	spin_lock_init(&chip->controller->lock);
+	init_waitqueue_head(&chip->controller->wq);
+	chip->state = FL_READY;
+	chip->priv = nandi;
+	chip->ecc.layout = &info->ecclayout;
+	chip->options |= NAND_NO_SUBPAGE_WRITE;
+
+	/* mtd_info */
+	mtd->owner = THIS_MODULE;
+	mtd->type = MTD_NANDFLASH;
+	mtd->flags = MTD_CAP_NANDFLASH;
+	mtd->ecclayout = &info->ecclayout;
+	mtd->subpage_sft = 0;
+}
+
 static void nandi_clk_enable(struct nandi_controller *nandi)
 {
 	if (nandi->emi_clk)
@@ -438,7 +491,11 @@ static int stm_nand_bch_probe(struct platform_device *pdev)
 {
 	struct stm_plat_nand_bch_data *pdata = pdev->dev.platform_data;
 	struct stm_nand_bank_data *bank;
+	struct nandi_bbt_info *bbt_info;
 	struct nandi_controller *nandi;
+	struct nandi_info *info;
+	struct nand_chip *chip;
+	struct mtd_info *mtd;
 
 	nandi = nandi_init_resources(pdev);
 	if (IS_ERR(nandi)) {
@@ -453,6 +510,16 @@ static int stm_nand_bch_probe(struct platform_device *pdev)
 	if (bank)
 		nandi_init_controller(nandi, bank->csn);
 
+	info            = &nandi->info;
+	chip            = &info->chip;
+	bbt_info        = &info->bbt_info;
+	mtd             = &info->mtd;
+	mtd->priv       = chip;
+	mtd->name       = dev_name(&pdev->dev);
+	mtd->dev.parent = &pdev->dev;
+
+	nandi_set_mtd_defaults(nandi, mtd, chip);
+
 	return 0;
 }
 
-- 
1.8.3.2

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