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52e042ea55
This adds the upstream Broadcom nand driver and makes use of it. Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> SVN-Revision: 46131
112 lines
3.3 KiB
Diff
112 lines
3.3 KiB
Diff
From 5844feeaa4154d1c46d3462c7a4653d22356d8b4 Mon Sep 17 00:00:00 2001
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From: Brian Norris <computersforpeace@gmail.com>
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Date: Fri, 23 Jan 2015 00:22:27 -0800
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Subject: [PATCH 20/32] mtd: nand: add common DT init code
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These are already-documented common bindings for NAND chips. Let's
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handle them in nand_base.
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If NAND controller drivers need to act on this data before bringing up
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the NAND chip (e.g., fill out ECC callback functions, change HW modes,
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etc.), then they can do so between calling nand_scan_ident() and
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nand_scan_tail().
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Signed-off-by: Brian Norris <computersforpeace@gmail.com>
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---
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drivers/mtd/nand/nand_base.c | 41 +++++++++++++++++++++++++++++++++++++++++
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include/linux/mtd/nand.h | 5 +++++
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2 files changed, 46 insertions(+)
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--- a/drivers/mtd/nand/nand_base.c
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+++ b/drivers/mtd/nand/nand_base.c
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@@ -48,6 +48,7 @@
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#include <linux/leds.h>
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#include <linux/io.h>
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#include <linux/mtd/partitions.h>
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+#include <linux/of_mtd.h>
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/* Define default oob placement schemes for large and small page devices */
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static struct nand_ecclayout nand_oob_8 = {
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@@ -3798,6 +3799,39 @@ ident_done:
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return type;
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}
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+static int nand_dt_init(struct mtd_info *mtd, struct nand_chip *chip,
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+ struct device_node *dn)
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+{
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+ int ecc_mode, ecc_strength, ecc_step;
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+
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+ if (of_get_nand_bus_width(dn) == 16)
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+ chip->options |= NAND_BUSWIDTH_16;
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+
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+ if (of_get_nand_on_flash_bbt(dn))
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+ chip->bbt_options |= NAND_BBT_USE_FLASH;
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+
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+ ecc_mode = of_get_nand_ecc_mode(dn);
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+ ecc_strength = of_get_nand_ecc_strength(dn);
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+ ecc_step = of_get_nand_ecc_step_size(dn);
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+
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+ if ((ecc_step >= 0 && !(ecc_strength >= 0)) ||
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+ (!(ecc_step >= 0) && ecc_strength >= 0)) {
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+ pr_err("must set both strength and step size in DT\n");
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+ return -EINVAL;
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+ }
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+
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+ if (ecc_mode >= 0)
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+ chip->ecc.mode = ecc_mode;
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+
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+ if (ecc_strength >= 0)
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+ chip->ecc.strength = ecc_strength;
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+
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+ if (ecc_step > 0)
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+ chip->ecc.size = ecc_step;
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+
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+ return 0;
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+}
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+
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/**
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* nand_scan_ident - [NAND Interface] Scan for the NAND device
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* @mtd: MTD device structure
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@@ -3815,6 +3849,13 @@ int nand_scan_ident(struct mtd_info *mtd
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int i, nand_maf_id, nand_dev_id;
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struct nand_chip *chip = mtd->priv;
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struct nand_flash_dev *type;
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+ int ret;
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+
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+ if (chip->dn) {
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+ ret = nand_dt_init(mtd, chip, chip->dn);
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+ if (ret)
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+ return ret;
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+ }
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/* Set the default functions */
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nand_set_defaults(chip, chip->options & NAND_BUSWIDTH_16);
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--- a/include/linux/mtd/nand.h
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+++ b/include/linux/mtd/nand.h
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@@ -26,6 +26,8 @@
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struct mtd_info;
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struct nand_flash_dev;
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+struct device_node;
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+
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/* Scan and identify a NAND device */
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extern int nand_scan(struct mtd_info *mtd, int max_chips);
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/*
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@@ -542,6 +544,7 @@ struct nand_buffers {
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* flash device
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* @IO_ADDR_W: [BOARDSPECIFIC] address to write the 8 I/O lines of the
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* flash device.
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+ * @dn: [BOARDSPECIFIC] device node describing this instance
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* @read_byte: [REPLACEABLE] read one byte from the chip
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* @read_word: [REPLACEABLE] read one word from the chip
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* @write_byte: [REPLACEABLE] write a single byte to the chip on the
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@@ -644,6 +647,8 @@ struct nand_chip {
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void __iomem *IO_ADDR_R;
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void __iomem *IO_ADDR_W;
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+ struct device_node *dn;
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+
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uint8_t (*read_byte)(struct mtd_info *mtd);
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u16 (*read_word)(struct mtd_info *mtd);
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void (*write_byte)(struct mtd_info *mtd, uint8_t byte);
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