diff options
Diffstat (limited to 'target/linux/bcm53xx/patches-4.1/090-mtd-nand-add-common-DT-init-code.patch')
| -rw-r--r-- | target/linux/bcm53xx/patches-4.1/090-mtd-nand-add-common-DT-init-code.patch | 111 |
1 files changed, 111 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/patches-4.1/090-mtd-nand-add-common-DT-init-code.patch b/target/linux/bcm53xx/patches-4.1/090-mtd-nand-add-common-DT-init-code.patch new file mode 100644 index 0000000000..cb2141a4b9 --- /dev/null +++ b/target/linux/bcm53xx/patches-4.1/090-mtd-nand-add-common-DT-init-code.patch @@ -0,0 +1,111 @@ +From 5844feeaa4154d1c46d3462c7a4653d22356d8b4 Mon Sep 17 00:00:00 2001 +From: Brian Norris <computersforpeace@gmail.com> +Date: Fri, 23 Jan 2015 00:22:27 -0800 +Subject: [PATCH 20/32] mtd: nand: add common DT init code + +These are already-documented common bindings for NAND chips. Let's +handle them in nand_base. + +If NAND controller drivers need to act on this data before bringing up +the NAND chip (e.g., fill out ECC callback functions, change HW modes, +etc.), then they can do so between calling nand_scan_ident() and +nand_scan_tail(). + +Signed-off-by: Brian Norris <computersforpeace@gmail.com> +--- + drivers/mtd/nand/nand_base.c | 41 +++++++++++++++++++++++++++++++++++++++++ + include/linux/mtd/nand.h | 5 +++++ + 2 files changed, 46 insertions(+) + +--- a/drivers/mtd/nand/nand_base.c ++++ b/drivers/mtd/nand/nand_base.c +@@ -48,6 +48,7 @@ + #include <linux/leds.h> + #include <linux/io.h> + #include <linux/mtd/partitions.h> ++#include <linux/of_mtd.h> + + /* Define default oob placement schemes for large and small page devices */ + static struct nand_ecclayout nand_oob_8 = { +@@ -3798,6 +3799,39 @@ ident_done: + return type; + } + ++static int nand_dt_init(struct mtd_info *mtd, struct nand_chip *chip, ++ struct device_node *dn) ++{ ++ int ecc_mode, ecc_strength, ecc_step; ++ ++ if (of_get_nand_bus_width(dn) == 16) ++ chip->options |= NAND_BUSWIDTH_16; ++ ++ if (of_get_nand_on_flash_bbt(dn)) ++ chip->bbt_options |= NAND_BBT_USE_FLASH; ++ ++ ecc_mode = of_get_nand_ecc_mode(dn); ++ ecc_strength = of_get_nand_ecc_strength(dn); ++ ecc_step = of_get_nand_ecc_step_size(dn); ++ ++ if ((ecc_step >= 0 && !(ecc_strength >= 0)) || ++ (!(ecc_step >= 0) && ecc_strength >= 0)) { ++ pr_err("must set both strength and step size in DT\n"); ++ return -EINVAL; ++ } ++ ++ if (ecc_mode >= 0) ++ chip->ecc.mode = ecc_mode; ++ ++ if (ecc_strength >= 0) ++ chip->ecc.strength = ecc_strength; ++ ++ if (ecc_step > 0) ++ chip->ecc.size = ecc_step; ++ ++ return 0; ++} ++ + /** + * nand_scan_ident - [NAND Interface] Scan for the NAND device + * @mtd: MTD device structure +@@ -3815,6 +3849,13 @@ int nand_scan_ident(struct mtd_info *mtd + int i, nand_maf_id, nand_dev_id; + struct nand_chip *chip = mtd->priv; + struct nand_flash_dev *type; ++ int ret; ++ ++ if (chip->dn) { ++ ret = nand_dt_init(mtd, chip, chip->dn); ++ if (ret) ++ return ret; ++ } + + /* Set the default functions */ + nand_set_defaults(chip, chip->options & NAND_BUSWIDTH_16); +--- a/include/linux/mtd/nand.h ++++ b/include/linux/mtd/nand.h +@@ -26,6 +26,8 @@ + + struct mtd_info; + struct nand_flash_dev; ++struct device_node; ++ + /* Scan and identify a NAND device */ + extern int nand_scan(struct mtd_info *mtd, int max_chips); + /* +@@ -542,6 +544,7 @@ struct nand_buffers { + * flash device + * @IO_ADDR_W: [BOARDSPECIFIC] address to write the 8 I/O lines of the + * flash device. ++ * @dn: [BOARDSPECIFIC] device node describing this instance + * @read_byte: [REPLACEABLE] read one byte from the chip + * @read_word: [REPLACEABLE] read one word from the chip + * @write_byte: [REPLACEABLE] write a single byte to the chip on the +@@ -644,6 +647,8 @@ struct nand_chip { + void __iomem *IO_ADDR_R; + void __iomem *IO_ADDR_W; + ++ struct device_node *dn; ++ + uint8_t (*read_byte)(struct mtd_info *mtd); + u16 (*read_word)(struct mtd_info *mtd); + void (*write_byte)(struct mtd_info *mtd, uint8_t byte); |