diff options
Diffstat (limited to 'drivers/mtd/nand/brcmnand')
| -rw-r--r-- | drivers/mtd/nand/brcmnand/Makefile | 1 | ||||
| -rw-r--r-- | drivers/mtd/nand/brcmnand/brcmnand.c | 2195 | ||||
| -rw-r--r-- | drivers/mtd/nand/brcmnand/brcmnand.h | 58 |
3 files changed, 2254 insertions, 0 deletions
diff --git a/drivers/mtd/nand/brcmnand/Makefile b/drivers/mtd/nand/brcmnand/Makefile new file mode 100644 index 000000000000..ab6062162c14 --- /dev/null +++ b/drivers/mtd/nand/brcmnand/Makefile @@ -0,0 +1 @@ +obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmnand.o diff --git a/drivers/mtd/nand/brcmnand/brcmnand.c b/drivers/mtd/nand/brcmnand/brcmnand.c new file mode 100644 index 000000000000..fb81aac8d4ef --- /dev/null +++ b/drivers/mtd/nand/brcmnand/brcmnand.c @@ -0,0 +1,2195 @@ +/* + * Copyright © 2010-2015 Broadcom Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#include <linux/version.h> +#include <linux/module.h> +#include <linux/init.h> +#include <linux/delay.h> +#include <linux/device.h> +#include <linux/platform_device.h> +#include <linux/err.h> +#include <linux/completion.h> +#include <linux/interrupt.h> +#include <linux/spinlock.h> +#include <linux/dma-mapping.h> +#include <linux/ioport.h> +#include <linux/bug.h> +#include <linux/kernel.h> +#include <linux/bitops.h> +#include <linux/mm.h> +#include <linux/mtd/mtd.h> +#include <linux/mtd/nand.h> +#include <linux/mtd/partitions.h> +#include <linux/of.h> +#include <linux/of_mtd.h> +#include <linux/of_platform.h> +#include <linux/slab.h> +#include <linux/list.h> +#include <linux/log2.h> + +#include "brcmnand.h" + +/* + * This flag controls if WP stays on between erase/write commands to mitigate + * flash corruption due to power glitches. Values: + * 0: NAND_WP is not used or not available + * 1: NAND_WP is set by default, cleared for erase/write operations + * 2: NAND_WP is always cleared + */ +static int wp_on = 1; +module_param(wp_on, int, 0444); + +/*********************************************************************** + * Definitions + ***********************************************************************/ + +#define DRV_NAME "brcmnand" + +#define CMD_NULL 0x00 +#define CMD_PAGE_READ 0x01 +#define CMD_SPARE_AREA_READ 0x02 +#define CMD_STATUS_READ 0x03 +#define CMD_PROGRAM_PAGE 0x04 +#define CMD_PROGRAM_SPARE_AREA 0x05 +#define CMD_COPY_BACK 0x06 +#define CMD_DEVICE_ID_READ 0x07 +#define CMD_BLOCK_ERASE 0x08 +#define CMD_FLASH_RESET 0x09 +#define CMD_BLOCKS_LOCK 0x0a +#define CMD_BLOCKS_LOCK_DOWN 0x0b +#define CMD_BLOCKS_UNLOCK 0x0c +#define CMD_READ_BLOCKS_LOCK_STATUS 0x0d +#define CMD_PARAMETER_READ 0x0e +#define CMD_PARAMETER_CHANGE_COL 0x0f +#define CMD_LOW_LEVEL_OP 0x10 + +struct brcm_nand_dma_desc { + u32 next_desc; + u32 next_desc_ext; + u32 cmd_irq; + u32 dram_addr; + u32 dram_addr_ext; + u32 tfr_len; + u32 total_len; + u32 flash_addr; + u32 flash_addr_ext; + u32 cs; + u32 pad2[5]; + u32 status_valid; +} __packed; + +/* Bitfields for brcm_nand_dma_desc::status_valid */ +#define FLASH_DMA_ECC_ERROR (1 << 8) +#define FLASH_DMA_CORR_ERROR (1 << 9) + +/* 512B flash cache in the NAND controller HW */ +#define FC_SHIFT 9U +#define FC_BYTES 512U +#define FC_WORDS (FC_BYTES >> 2) + +#define BRCMNAND_MIN_PAGESIZE 512 +#define BRCMNAND_MIN_BLOCKSIZE (8 * 1024) +#define BRCMNAND_MIN_DEVSIZE (4ULL * 1024 * 1024) + +/* Controller feature flags */ +enum { + BRCMNAND_HAS_1K_SECTORS = BIT(0), + BRCMNAND_HAS_PREFETCH = BIT(1), + BRCMNAND_HAS_CACHE_MODE = BIT(2), + BRCMNAND_HAS_WP = BIT(3), +}; + +struct brcmnand_controller { + struct device *dev; + struct nand_hw_control controller; + void __iomem *nand_base; + void __iomem *nand_fc; /* flash cache */ + void __iomem *flash_dma_base; + unsigned int irq; + unsigned int dma_irq; + int nand_version; + + int cmd_pending; + bool dma_pending; + struct completion done; + struct completion dma_done; + + /* List of NAND hosts (one for each chip-select) */ + struct list_head host_list; + + struct brcm_nand_dma_desc *dma_desc; + dma_addr_t dma_pa; + + /* in-memory cache of the FLASH_CACHE, used only for some commands */ + u32 flash_cache[FC_WORDS]; + + /* Controller revision details */ + const u16 *reg_offsets; + unsigned int reg_spacing; /* between CS1, CS2, ... regs */ + const u8 *cs_offsets; /* within each chip-select */ + const u8 *cs0_offsets; /* within CS0, if different */ + unsigned int max_block_size; + const unsigned int *block_sizes; + unsigned int max_page_size; + const unsigned int *page_sizes; + unsigned int max_oob; + u32 features; + + /* for low-power standby/resume only */ + u32 nand_cs_nand_select; + u32 nand_cs_nand_xor; + u32 corr_stat_threshold; + u32 flash_dma_mode; +}; + +struct brcmnand_cfg { + u64 device_size; + unsigned int block_size; + unsigned int page_size; + unsigned int spare_area_size; + unsigned int device_width; + unsigned int col_adr_bytes; + unsigned int blk_adr_bytes; + unsigned int ful_adr_bytes; + unsigned int sector_size_1k; + unsigned int ecc_level; + /* use for low-power standby/resume only */ + u32 acc_control; + u32 config; + u32 config_ext; + u32 timing_1; + u32 timing_2; +}; + +struct brcmnand_host { + struct list_head node; + struct device_node *of_node; + + struct nand_chip chip; + struct mtd_info mtd; + struct platform_device *pdev; + int cs; + + unsigned int last_cmd; + unsigned int last_byte; + u64 last_addr; + struct brcmnand_cfg hwcfg; + struct brcmnand_controller *ctrl; +}; + +enum brcmnand_reg { + BRCMNAND_CMD_START = 0, + BRCMNAND_CMD_EXT_ADDRESS, + BRCMNAND_CMD_ADDRESS, + BRCMNAND_INTFC_STATUS, + BRCMNAND_CS_SELECT, + BRCMNAND_CS_XOR, + BRCMNAND_LL_OP, + BRCMNAND_CS0_BASE, + BRCMNAND_CS1_BASE, /* CS1 regs, if non-contiguous */ + BRCMNAND_CORR_THRESHOLD, + BRCMNAND_CORR_THRESHOLD_EXT, + BRCMNAND_UNCORR_COUNT, + BRCMNAND_CORR_COUNT, + BRCMNAND_CORR_EXT_ADDR, + BRCMNAND_CORR_ADDR, + BRCMNAND_UNCORR_EXT_ADDR, + BRCMNAND_UNCORR_ADDR, + BRCMNAND_SEMAPHORE, + BRCMNAND_ID, + BRCMNAND_ID_EXT, + BRCMNAND_LL_RDATA, + BRCMNAND_OOB_READ_BASE, + BRCMNAND_OOB_READ_10_BASE, /* offset 0x10, if non-contiguous */ + BRCMNAND_OOB_WRITE_BASE, + BRCMNAND_OOB_WRITE_10_BASE, /* offset 0x10, if non-contiguous */ + BRCMNAND_FC_BASE, +}; + +/* BRCMNAND v4.0 */ +static const u16 brcmnand_regs_v40[] = { + [BRCMNAND_CMD_START] = 0x04, + [BRCMNAND_CMD_EXT_ADDRESS] = 0x08, + [BRCMNAND_CMD_ADDRESS] = 0x0c, + [BRCMNAND_INTFC_STATUS] = 0x6c, + [BRCMNAND_CS_SELECT] = 0x14, + [BRCMNAND_CS_XOR] = 0x18, + [BRCMNAND_LL_OP] = 0x178, + [BRCMNAND_CS0_BASE] = 0x40, + [BRCMNAND_CS1_BASE] = 0xd0, + [BRCMNAND_CORR_THRESHOLD] = 0x84, + [BRCMNAND_CORR_THRESHOLD_EXT] = 0, + [BRCMNAND_UNCORR_COUNT] = 0, + [BRCMNAND_CORR_COUNT] = 0, + [BRCMNAND_CORR_EXT_ADDR] = 0x70, + [BRCMNAND_CORR_ADDR] = 0x74, + [BRCMNAND_UNCORR_EXT_ADDR] = 0x78, + [BRCMNAND_UNCORR_ADDR] = 0x7c, + [BRCMNAND_SEMAPHORE] = 0x58, + [BRCMNAND_ID] = 0x60, + [BRCMNAND_ID_EXT] = 0x64, + [BRCMNAND_LL_RDATA] = 0x17c, + [BRCMNAND_OOB_READ_BASE] = 0x20, + [BRCMNAND_OOB_READ_10_BASE] = 0x130, + [BRCMNAND_OOB_WRITE_BASE] = 0x30, + [BRCMNAND_OOB_WRITE_10_BASE] = 0, + [BRCMNAND_FC_BASE] = 0x200, +}; + +/* BRCMNAND v5.0 */ +static const u16 brcmnand_regs_v50[] = { + [BRCMNAND_CMD_START] = 0x04, + [BRCMNAND_CMD_EXT_ADDRESS] = 0x08, + [BRCMNAND_CMD_ADDRESS] = 0x0c, + [BRCMNAND_INTFC_STATUS] = 0x6c, + [BRCMNAND_CS_SELECT] = 0x14, + [BRCMNAND_CS_XOR] = 0x18, + [BRCMNAND_LL_OP] = 0x178, + [BRCMNAND_CS0_BASE] = 0x40, + [BRCMNAND_CS1_BASE] = 0xd0, + [BRCMNAND_CORR_THRESHOLD] = 0x84, + [BRCMNAND_CORR_THRESHOLD_EXT] = 0, + [BRCMNAND_UNCORR_COUNT] = 0, + [BRCMNAND_CORR_COUNT] = 0, + [BRCMNAND_CORR_EXT_ADDR] = 0x70, + [BRCMNAND_CORR_ADDR] = 0x74, + [BRCMNAND_UNCORR_EXT_ADDR] = 0x78, + [BRCMNAND_UNCORR_ADDR] = 0x7c, + [BRCMNAND_SEMAPHORE] = 0x58, + [BRCMNAND_ID] = 0x60, + [BRCMNAND_ID_EXT] = 0x64, + [BRCMNAND_LL_RDATA] = 0x17c, + [BRCMNAND_OOB_READ_BASE] = 0x20, + [BRCMNAND_OOB_READ_10_BASE] = 0x130, + [BRCMNAND_OOB_WRITE_BASE] = 0x30, + [BRCMNAND_OOB_WRITE_10_BASE] = 0x140, + [BRCMNAND_FC_BASE] = 0x200, +}; + +/* BRCMNAND v6.0 - v7.1 */ +static const u16 brcmnand_regs_v60[] = { + [BRCMNAND_CMD_START] = 0x04, + [BRCMNAND_CMD_EXT_ADDRESS] = 0x08, + [BRCMNAND_CMD_ADDRESS] = 0x0c, + [BRCMNAND_INTFC_STATUS] = 0x14, + [BRCMNAND_CS_SELECT] = 0x18, + [BRCMNAND_CS_XOR] = 0x1c, + [BRCMNAND_LL_OP] = 0x20, + [BRCMNAND_CS0_BASE] = 0x50, + [BRCMNAND_CS1_BASE] = 0, + [BRCMNAND_CORR_THRESHOLD] = 0xc0, + [BRCMNAND_CORR_THRESHOLD_EXT] = 0xc4, + [BRCMNAND_UNCORR_COUNT] = 0xfc, + [BRCMNAND_CORR_COUNT] = 0x100, + [BRCMNAND_CORR_EXT_ADDR] = 0x10c, + [BRCMNAND_CORR_ADDR] = 0x110, + [BRCMNAND_UNCORR_EXT_ADDR] = 0x114, + [BRCMNAND_UNCORR_ADDR] = 0x118, + [BRCMNAND_SEMAPHORE] = 0x150, + [BRCMNAND_ID] = 0x194, + [BRCMNAND_ID_EXT] = 0x198, + [BRCMNAND_LL_RDATA] = 0x19c, + [BRCMNAND_OOB_READ_BASE] = 0x200, + [BRCMNAND_OOB_READ_10_BASE] = 0, + [BRCMNAND_OOB_WRITE_BASE] = 0x280, + [BRCMNAND_OOB_WRITE_10_BASE] = 0, + [BRCMNAND_FC_BASE] = 0x400, +}; + +enum brcmnand_cs_reg { + BRCMNAND_CS_CFG_EXT = 0, + BRCMNAND_CS_CFG, + BRCMNAND_CS_ACC_CONTROL, + BRCMNAND_CS_TIMING1, + BRCMNAND_CS_TIMING2, +}; + +/* Per chip-select offsets for v7.1 */ +static const u8 brcmnand_cs_offsets_v71[] = { + [BRCMNAND_CS_ACC_CONTROL] = 0x00, + [BRCMNAND_CS_CFG_EXT] = 0x04, + [BRCMNAND_CS_CFG] = 0x08, + [BRCMNAND_CS_TIMING1] = 0x0c, + [BRCMNAND_CS_TIMING2] = 0x10, +}; + +/* Per chip-select offsets for pre v7.1, except CS0 on <= v5.0 */ +static const u8 brcmnand_cs_offsets[] = { + [BRCMNAND_CS_ACC_CONTROL] = 0x00, + [BRCMNAND_CS_CFG_EXT] = 0x04, + [BRCMNAND_CS_CFG] = 0x04, + [BRCMNAND_CS_TIMING1] = 0x08, + [BRCMNAND_CS_TIMING2] = 0x0c, +}; + +/* Per chip-select offset for <= v5.0 on CS0 only */ +static const u8 brcmnand_cs_offsets_cs0[] = { + [BRCMNAND_CS_ACC_CONTROL] = 0x00, + [BRCMNAND_CS_CFG_EXT] = 0x08, + [BRCMNAND_CS_CFG] = 0x08, + [BRCMNAND_CS_TIMING1] = 0x10, + [BRCMNAND_CS_TIMING2] = 0x14, +}; + +/* BRCMNAND_INTFC_STATUS */ +enum { + INTFC_FLASH_STATUS = GENMASK(7, 0), + + INTFC_ERASED = BIT(27), + INTFC_OOB_VALID = BIT(28), + INTFC_CACHE_VALID = BIT(29), + INTFC_FLASH_READY = BIT(30), + INTFC_CTLR_READY = BIT(31), +}; + +static inline u32 nand_readreg(struct brcmnand_controller *ctrl, u32 offs) +{ + return brcmnand_readl(ctrl->nand_base + offs); +} + +static inline void nand_writereg(struct brcmnand_controller *ctrl, u32 offs, + u32 val) +{ + brcmnand_writel(val, ctrl->nand_base + offs); +} + +static int brcmnand_revision_init(struct brcmnand_controller *ctrl) +{ + static const unsigned int block_sizes_v6[] = { 8, 16, 128, 256, 512, 1024, 2048, 0 }; + static const unsigned int block_sizes_v4[] = { 16, 128, 8, 512, 256, 1024, 2048, 0 }; + static const unsigned int page_sizes[] = { 512, 2048, 4096, 8192, 0 }; + + ctrl->nand_version = nand_readreg(ctrl, 0) & 0xffff; + + /* Only support v4.0+? */ + if (ctrl->nand_version < 0x0400) { + dev_err(ctrl->dev, "version %#x not supported\n", + ctrl->nand_version); + return -ENODEV; + } + + /* Register offsets */ + if (ctrl->nand_version >= 0x0600) + ctrl->reg_offsets = brcmnand_regs_v60; + else if (ctrl->nand_version >= 0x0500) + ctrl->reg_offsets = brcmnand_regs_v50; + else if (ctrl->nand_version >= 0x0400) + ctrl->reg_offsets = brcmnand_regs_v40; + + /* Chip-select stride */ + if (ctrl->nand_version >= 0x0701) + ctrl->reg_spacing = 0x14; + else + ctrl->reg_spacing = 0x10; + + /* Per chip-select registers */ + if (ctrl->nand_version >= 0x0701) { + ctrl->cs_offsets = brcmnand_cs_offsets_v71; + } else { + ctrl->cs_offsets = brcmnand_cs_offsets; + + /* v5.0 and earlier has a different CS0 offset layout */ + if (ctrl->nand_version <= 0x0500) + ctrl->cs0_offsets = brcmnand_cs_offsets_cs0; + } + + /* Page / block sizes */ + if (ctrl->nand_version >= 0x0701) { + /* >= v7.1 use nice power-of-2 values! */ + ctrl->max_page_size = 16 * 1024; + ctrl->max_block_size = 2 * 1024 * 1024; + } else { + ctrl->page_sizes = page_sizes; + if (ctrl->nand_version >= 0x0600) + ctrl->block_sizes = block_sizes_v6; + else + ctrl->block_sizes = block_sizes_v4; + + if (ctrl->nand_version < 0x0400) { + ctrl->max_page_size = 4096; + ctrl->max_block_size = 512 * 1024; + } + } + + /* Maximum spare area sector size (per 512B) */ + if (ctrl->nand_version >= 0x0600) + ctrl->max_oob = 64; + else if (ctrl->nand_version >= 0x0500) + ctrl->max_oob = 32; + else + ctrl->max_oob = 16; + + /* v6.0 and newer (except v6.1) have prefetch support */ + if (ctrl->nand_version >= 0x0600 && ctrl->nand_version != 0x0601) + ctrl->features |= BRCMNAND_HAS_PREFETCH; + + /* + * v6.x has cache mode, but it's implemented differently. Ignore it for + * now. + */ + if (ctrl->nand_version >= 0x0700) + ctrl->features |= BRCMNAND_HAS_CACHE_MODE; + + if (ctrl->nand_version >= 0x0500) + ctrl->features |= BRCMNAND_HAS_1K_SECTORS; + + if (ctrl->nand_version >= 0x0700) + ctrl->features |= BRCMNAND_HAS_WP; + else if (of_property_read_bool(ctrl->dev->of_node, "brcm,nand-has-wp")) + ctrl->features |= BRCMNAND_HAS_WP; + + return 0; +} + +static inline u32 brcmnand_read_reg(struct brcmnand_controller *ctrl, + enum brcmnand_reg reg) +{ + u16 offs = ctrl->reg_offsets[reg]; + + if (offs) + return nand_readreg(ctrl, offs); + else + return 0; +} + +static inline void brcmnand_write_reg(struct brcmnand_controller *ctrl, + enum brcmnand_reg reg, u32 val) +{ + u16 offs = ctrl->reg_offsets[reg]; + + if (offs) + nand_writereg(ctrl, offs, val); +} + +static inline void brcmnand_rmw_reg(struct brcmnand_controller *ctrl, + enum brcmnand_reg reg, u32 mask, unsigned + int shift, u32 val) +{ + u32 tmp = brcmnand_read_reg(ctrl, reg); + + tmp &= ~mask; + tmp |= val << shift; + brcmnand_write_reg(ctrl, reg, tmp); +} + +static inline u32 brcmnand_read_fc(struct brcmnand_controller *ctrl, int word) +{ + return __raw_readl(ctrl->nand_fc + word * 4); +} + +static inline void brcmnand_write_fc(struct brcmnand_controller *ctrl, + int word, u32 val) +{ + __raw_writel(val, ctrl->nand_fc + word * 4); +} + +static inline u16 brcmnand_cs_offset(struct brcmnand_controller *ctrl, int cs, + enum brcmnand_cs_reg reg) +{ + u16 offs_cs0 = ctrl->reg_offsets[BRCMNAND_CS0_BASE]; + u16 offs_cs1 = ctrl->reg_offsets[BRCMNAND_CS1_BASE]; + u8 cs_offs; + + if (cs == 0 && ctrl->cs0_offsets) + cs_offs = ctrl->cs0_offsets[reg]; + else + cs_offs = ctrl->cs_offsets[reg]; + + if (cs && offs_cs1) + return offs_cs1 + (cs - 1) * ctrl->reg_spacing + cs_offs; + + return offs_cs0 + cs * ctrl->reg_spacing + cs_offs; +} + +static inline u32 brcmnand_count_corrected(struct brcmnand_controller *ctrl) +{ + if (ctrl->nand_version < 0x0600) + return 1; + return brcmnand_read_reg(ctrl, BRCMNAND_CORR_COUNT); +} + +static void brcmnand_wr_corr_thresh(struct brcmnand_host *host, u8 val) +{ + struct brcmnand_controller *ctrl = host->ctrl; + unsigned int shift = 0, bits; + enum brcmnand_reg reg = BRCMNAND_CORR_THRESHOLD; + int cs = host->cs; + + if (ctrl->nand_version >= 0x0600) + bits = 6; + else if (ctrl->nand_version >= 0x0500) + bits = 5; + else + bits = 4; + + if (ctrl->nand_version >= 0x0600) { + if (cs >= 5) + reg = BRCMNAND_CORR_THRESHOLD_EXT; + shift = (cs % 5) * bits; + } + brcmnand_rmw_reg(ctrl, reg, (bits - 1) << shift, shift, val); +} + +static inline int brcmnand_cmd_shift(struct brcmnand_controller *ctrl) +{ + if (ctrl->nand_version < 0x0700) + return 24; + return 0; +} + +/*********************************************************************** + * NAND ACC CONTROL bitfield + * + * Some bits have remained constant throughout hardware revision, while + * others have shifted around. + ***********************************************************************/ + +/* Constant for all versions (where supported) */ +enum { + /* See BRCMNAND_HAS_CACHE_MODE */ + ACC_CONTROL_CACHE_MODE = BIT(22), + + /* See BRCMNAND_HAS_PREFETCH */ + ACC_CONTROL_PREFETCH = BIT(23), + + ACC_CONTROL_PAGE_HIT = BIT(24), + ACC_CONTROL_WR_PREEMPT = BIT(25), + ACC_CONTROL_PARTIAL_PAGE = BIT(26), + ACC_CONTROL_RD_ERASED = BIT(27), + ACC_CONTROL_FAST_PGM_RDIN = BIT(28), + ACC_CONTROL_WR_ECC = BIT(30), + ACC_CONTROL_RD_ECC = BIT(31), +}; + +static inline u32 brcmnand_spare_area_mask(struct brcmnand_controller *ctrl) +{ + if (ctrl->nand_version >= 0x0600) + return GENMASK(6, 0); + else + return GENMASK(5, 0); +} + +#define NAND_ACC_CONTROL_ECC_SHIFT 16 + +static inline u32 brcmnand_ecc_level_mask(struct brcmnand_controller *ctrl) +{ + u32 mask = (ctrl->nand_version >= 0x0600) ? 0x1f : 0x0f; + + return mask << NAND_ACC_CONTROL_ECC_SHIFT; +} + +static void brcmnand_set_ecc_enabled(struct brcmnand_host *host, int en) +{ + struct brcmnand_controller *ctrl = host->ctrl; + u16 offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_ACC_CONTROL); + u32 acc_control = nand_readreg(ctrl, offs); + u32 ecc_flags = ACC_CONTROL_WR_ECC | ACC_CONTROL_RD_ECC; + + if (en) { + acc_control |= ecc_flags; /* enable RD/WR ECC */ + acc_control |= host->hwcfg.ecc_level + << NAND_ACC_CONTROL_ECC_SHIFT; + } else { + acc_control &= ~ecc_flags; /* disable RD/WR ECC */ + acc_control &= ~brcmnand_ecc_level_mask(ctrl); + } + + nand_writereg(ctrl, offs, acc_control); +} + +static inline int brcmnand_sector_1k_shift(struct brcmnand_controller *ctrl) +{ + if (ctrl->nand_version >= 0x0600) + return 7; + else if (ctrl->nand_version >= 0x0500) + return 6; + else + return -1; +} + +static int brcmnand_get_sector_size_1k(struct brcmnand_host *host) +{ + struct brcmnand_controller *ctrl = host->ctrl; + int shift = brcmnand_sector_1k_shift(ctrl); + u16 acc_control_offs = brcmnand_cs_offset(ctrl, host->cs, + BRCMNAND_CS_ACC_CONTROL); + + if (shift < 0) + return 0; + + return (nand_readreg(ctrl, acc_control_offs) >> shift) & 0x1; +} + +static void brcmnand_set_sector_size_1k(struct brcmnand_host *host, int val) +{ + struct brcmnand_controller *ctrl = host->ctrl; + int shift = brcmnand_sector_1k_shift(ctrl); + u16 acc_control_offs = brcmnand_cs_offset(ctrl, host->cs, + BRCMNAND_CS_ACC_CONTROL); + u32 tmp; + + if (shift < 0) + return; + + tmp = nand_readreg(ctrl, acc_control_offs); + tmp &= ~(1 << shift); + tmp |= (!!val) << shift; + nand_writereg(ctrl, acc_control_offs, tmp); +} + +/*********************************************************************** + * CS_NAND_SELECT + ***********************************************************************/ + +enum { + CS_SELECT_NAND_WP = BIT(29), + CS_SELECT_AUTO_DEVICE_ID_CFG = BIT(30), +}; + +static inline void brcmnand_set_wp(struct brcmnand_controller *ctrl, bool en) +{ + u32 val = en ? CS_SELECT_NAND_WP : 0; + + brcmnand_rmw_reg(ctrl, BRCMNAND_CS_SELECT, CS_SELECT_NAND_WP, 0, val); +} + +/*********************************************************************** + * Flash DMA + ***********************************************************************/ + +enum flash_dma_reg { + FLASH_DMA_REVISION = 0x00, + FLASH_DMA_FIRST_DESC = 0x04, + FLASH_DMA_FIRST_DESC_EXT = 0x08, + FLASH_DMA_CTRL = 0x0c, + FLASH_DMA_MODE = 0x10, + FLASH_DMA_STATUS = 0x14, + FLASH_DMA_INTERRUPT_DESC = 0x18, + FLASH_DMA_INTERRUPT_DESC_EXT = 0x1c, + FLASH_DMA_ERROR_STATUS = 0x20, + FLASH_DMA_CURRENT_DESC = 0x24, + FLASH_DMA_CURRENT_DESC_EXT = 0x28, +}; + +static inline bool has_flash_dma(struct brcmnand_controller *ctrl) +{ + return ctrl->flash_dma_base; +} + +static inline bool flash_dma_buf_ok(const void *buf) +{ + return buf && !is_vmalloc_addr(buf) && + likely(IS_ALIGNED((uintptr_t)buf, 4)); +} + +static inline void flash_dma_writel(struct brcmnand_controller *ctrl, u8 offs, + u32 val) +{ + brcmnand_writel(val, ctrl->flash_dma_base + offs); +} + +static inline u32 flash_dma_readl(struct brcmnand_controller *ctrl, u8 offs) +{ + return brcmnand_readl(ctrl->flash_dma_base + offs); +} + +/* Low-level operation types: command, address, write, or read */ +enum brcmnand_llop_type { + LL_OP_CMD, + LL_OP_ADDR, + LL_OP_WR, + LL_OP_RD, +}; + +/*********************************************************************** + * Internal support functions + ***********************************************************************/ + +static inline bool is_hamming_ecc(struct brcmnand_cfg *cfg) +{ + return cfg->sector_size_1k == 0 && cfg->spare_area_size == 16 && + cfg->ecc_level == 15; +} + +/* + * Returns a nand_ecclayout strucutre for the given layout/configuration. + * Returns NULL on failure. + */ +static struct nand_ecclayout *brcmnand_create_layout(int ecc_level, + struct brcmnand_host *host) +{ + struct brcmnand_cfg *cfg = &host->hwcfg; + int i, j; + struct nand_ecclayout *layout; + int req; + int sectors; + int sas; + int idx1, idx2; + + layout = devm_kzalloc(&host->pdev->dev, sizeof(*layout), GFP_KERNEL); + if (!layout) + return NULL; + + sectors = cfg->page_size / (512 << cfg->sector_size_1k); + sas = cfg->spare_area_size << cfg->sector_size_1k; + + /* Hamming */ + if (is_hamming_ecc(cfg)) { + for (i = 0, idx1 = 0, idx2 = 0; i < sectors; i++) { + /* First sector of each page may have BBI */ + if (i == 0) { + layout->oobfree[idx2].offset = i * sas + 1; + /* Small-page NAND use byte 6 for BBI */ + if (cfg->page_size == 512) + layout->oobfree[idx2].offset--; + layout->oobfree[idx2].length = 5; + } else { + layout->oobfree[idx2].offset = i * sas; + layout->oobfree[idx2].length = 6; + } + idx2++; + layout->eccpos[idx1++] = i * sas + 6; + layout->eccpos[idx1++] = i * sas + 7; + layout->eccpos[idx1++] = i * sas + 8; + layout->oobfree[idx2].offset = i * sas + 9; + layout->oobfree[idx2].length = 7; + idx2++; + /* Leave zero-terminated entry for OOBFREE */ + if (idx1 >= MTD_MAX_ECCPOS_ENTRIES_LARGE || + idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1) + break; + } + goto out; + } + + /* + * CONTROLLER_VERSION: + * < v5.0: ECC_REQ = ceil(BCH_T * 13/8) + * >= v5.0: ECC_REQ = ceil(BCH_T * 14/8) + * But we will just be conservative. + */ + req = DIV_ROUND_UP(ecc_level * 14, 8); + if (req >= sas) { + dev_err(&host->pdev->dev, + "error: ECC too large for OOB (ECC bytes %d, spare sector %d)\n", + req, sas); + return NULL; + } + + layout->eccbytes = req * sectors; + for (i = 0, idx1 = 0, idx2 = 0; i < sectors; i++) { + for (j = sas - req; j < sas && idx1 < + MTD_MAX_ECCPOS_ENTRIES_LARGE; j++, idx1++) + layout->eccpos[idx1] = i * sas + j; + + /* First sector of each page may have BBI */ + if (i == 0) { + if (cfg->page_size == 512 && (sas - req >= 6)) { + /* Small-page NAND use byte 6 for BBI */ + layout->oobfree[idx2].offset = 0; + layout->oobfree[idx2].length = 5; + idx2++; + if (sas - req > 6) { + layout->oobfree[idx2].offset = 6; + layout->oobfree[idx2].length = + sas - req - 6; + idx2++; + } + } else if (sas > req + 1) { + layout->oobfree[idx2].offset = i * sas + 1; + layout->oobfree[idx2].length = sas - req - 1; + idx2++; + } + } else if (sas > req) { + layout->oobfree[idx2].offset = i * sas; + layout->oobfree[idx2].length = sas - req; + idx2++; + } + /* Leave zero-terminated entry for OOBFREE */ + if (idx1 >= MTD_MAX_ECCPOS_ENTRIES_LARGE || + idx2 >= MTD_MAX_OOBFREE_ENTRIES_LARGE - 1) + break; + } +out: + /* Sum available OOB */ + for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES_LARGE; i++) + layout->oobavail += layout->oobfree[i].length; + return layout; +} + +static struct nand_ecclayout *brcmstb_choose_ecc_layout( + struct brcmnand_host *host) +{ + struct nand_ecclayout *layout; + struct brcmnand_cfg *p = &host->hwcfg; + unsigned int ecc_level = p->ecc_level; + + if (p->sector_size_1k) + ecc_level <<= 1; + + layout = brcmnand_create_layout(ecc_level, host); + if (!layout) { + dev_err(&host->pdev->dev, + "no proper ecc_layout for this NAND cfg\n"); + return NULL; + } + + return layout; +} + +static void brcmnand_wp(struct mtd_info *mtd, int wp) +{ + struct nand_chip *chip = mtd->priv; + struct brcmnand_host *host = chip->priv; + struct brcmnand_controller *ctrl = host->ctrl; + + if ((ctrl->features & BRCMNAND_HAS_WP) && wp_on == 1) { + static int old_wp = -1; + + if (old_wp != wp) { + dev_dbg(ctrl->dev, "WP %s\n", wp ? "on" : "off"); + old_wp = wp; + } + brcmnand_set_wp(ctrl, wp); + } +} + +/* Helper functions for reading and writing OOB registers */ +static inline u8 oob_reg_read(struct brcmnand_controller *ctrl, u32 offs) +{ + u16 offset0, offset10, reg_offs; + + offset0 = ctrl->reg_offsets[BRCMNAND_OOB_READ_BASE]; + offset10 = ctrl->reg_offsets[BRCMNAND_OOB_READ_10_BASE]; + + if (offs >= ctrl->max_oob) + return 0x77; + + if (offs >= 16 && offset10) + reg_offs = offset10 + ((offs - 0x10) & ~0x03); + else + reg_offs = offset0 + (offs & ~0x03); + + return nand_readreg(ctrl, reg_offs) >> (24 - ((offs & 0x03) << 3)); +} + +static inline void oob_reg_write(struct brcmnand_controller *ctrl, u32 offs, + u32 data) +{ + u16 offset0, offset10, reg_offs; + + offset0 = ctrl->reg_offsets[BRCMNAND_OOB_WRITE_BASE]; + offset10 = ctrl->reg_offsets[BRCMNAND_OOB_WRITE_10_BASE]; + + if (offs >= ctrl->max_oob) + return; + + if (offs >= 16 && offset10) + reg_offs = offset10 + ((offs - 0x10) & ~0x03); + else + reg_offs = offset0 + (offs & ~0x03); + + nand_writereg(ctrl, reg_offs, data); +} + +/* + * read_oob_from_regs - read data from OOB registers + * @ctrl: NAND controller + * @i: sub-page sector index + * @oob: buffer to read to + * @sas: spare area sector size (i.e., OOB size per FLASH_CACHE) + * @sector_1k: 1 for 1KiB sectors, 0 for 512B, other values are illegal + */ +static int read_oob_from_regs(struct brcmnand_controller *ctrl, int i, u8 *oob, + int sas, int sector_1k) +{ + int tbytes = sas << sector_1k; + int j; + + /* Adjust OOB values for 1K sector size */ + if (sector_1k && (i & 0x01)) + tbytes = max(0, tbytes - (int)ctrl->max_oob); + tbytes = min_t(int, tbytes, ctrl->max_oob); + + for (j = 0; j < tbytes; j++) + oob[j] = oob_reg_read(ctrl, j); + return tbytes; +} + +/* + * write_oob_to_regs - write data to OOB registers + * @i: sub-page sector index + * @oob: buffer to write from + * @sas: spare area sector size (i.e., OOB size per FLASH_CACHE) + * @sector_1k: 1 for 1KiB sectors, 0 for 512B, other values are illegal + */ +static int write_oob_to_regs(struct brcmnand_controller *ctrl, int i, + const u8 *oob, int sas, int sector_1k) +{ + int tbytes = sas << sector_1k; + int j; + + /* Adjust OOB values for 1K sector size */ + if (sector_1k && (i & 0x01)) + tbytes = max(0, tbytes - (int)ctrl->max_oob); + tbytes = min_t(int, tbytes, ctrl->max_oob); + + for (j = 0; j < tbytes; j += 4) + oob_reg_write(ctrl, j, + (oob[j + 0] << 24) | + (oob[j + 1] << 16) | + (oob[j + 2] << 8) | + (oob[j + 3] << 0)); + return tbytes; +} + +static irqreturn_t brcmnand_ctlrdy_irq(int irq, void *data) +{ + struct brcmnand_controller *ctrl = data; + + /* Discard all NAND_CTLRDY interrupts during DMA */ + if (ctrl->dma_pending) + return IRQ_HANDLED; + + complete(&ctrl->done); + return IRQ_HANDLED; +} + +static irqreturn_t brcmnand_dma_irq(int irq, void *data) +{ + struct brcmnand_controller *ctrl = data; + + complete(&ctrl->dma_done); + + return IRQ_HANDLED; +} + +static void brcmnand_send_cmd(struct brcmnand_host *host, int cmd) +{ + struct brcmnand_controller *ctrl = host->ctrl; + u32 intfc; + + dev_dbg(ctrl->dev, "send native cmd %d addr_lo 0x%x\n", cmd, + brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS)); + BUG_ON(ctrl->cmd_pending != 0); + ctrl->cmd_pending = cmd; + + intfc = brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS); + BUG_ON(!(intfc & INTFC_CTLR_READY)); + + mb(); /* flush previous writes */ + brcmnand_write_reg(ctrl, BRCMNAND_CMD_START, + cmd << brcmnand_cmd_shift(ctrl)); +} + +/*********************************************************************** + * NAND MTD API: read/program/erase + ***********************************************************************/ + +static void brcmnand_cmd_ctrl(struct mtd_info *mtd, int dat, + unsigned int ctrl) +{ + /* intentionally left blank */ +} + +static int brcmnand_waitfunc(struct mtd_info *mtd, struct nand_chip *this) +{ + struct nand_chip *chip = mtd->priv; + struct brcmnand_host *host = chip->priv; + struct brcmnand_controller *ctrl = host->ctrl; + unsigned long timeo = msecs_to_jiffies(100); + + dev_dbg(ctrl->dev, "wait on native cmd %d\n", ctrl->cmd_pending); + if (ctrl->cmd_pending && + wait_for_completion_timeout(&ctrl->done, timeo) <= 0) { + u32 cmd = brcmnand_read_reg(ctrl, BRCMNAND_CMD_START) + >> brcmnand_cmd_shift(ctrl); + + dev_err_ratelimited(ctrl->dev, + "timeout waiting for command %#02x\n", cmd); + dev_err_ratelimited(ctrl->dev, "intfc status %08x\n", + brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS)); + } + ctrl->cmd_pending = 0; + return brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS) & + INTFC_FLASH_STATUS; +} + +enum { + LLOP_RE = BIT(16), + LLOP_WE = BIT(17), + LLOP_ALE = BIT(18), + LLOP_CLE = BIT(19), + LLOP_RETURN_IDLE = BIT(31), + + LLOP_DATA_MASK = GENMASK(15, 0), +}; + +static int brcmnand_low_level_op(struct brcmnand_host *host, + enum brcmnand_llop_type type, u32 data, + bool last_op) +{ + struct mtd_info *mtd = &host->mtd; + struct nand_chip *chip = &host->chip; + struct brcmnand_controller *ctrl = host->ctrl; + u32 tmp; + + tmp = data & LLOP_DATA_MASK; + switch (type) { + case LL_OP_CMD: + tmp |= LLOP_WE | LLOP_CLE; + break; + case LL_OP_ADDR: + /* WE | ALE */ + tmp |= LLOP_WE | LLOP_ALE; + break; + case LL_OP_WR: + /* WE */ + tmp |= LLOP_WE; + break; + case LL_OP_RD: + /* RE */ + tmp |= LLOP_RE; + break; + } + if (last_op) + /* RETURN_IDLE */ + tmp |= LLOP_RETURN_IDLE; + + dev_dbg(ctrl->dev, "ll_op cmd %#x\n", tmp); + + brcmnand_write_reg(ctrl, BRCMNAND_LL_OP, tmp); + (void)brcmnand_read_reg(ctrl, BRCMNAND_LL_OP); + + brcmnand_send_cmd(host, CMD_LOW_LEVEL_OP); + return brcmnand_waitfunc(mtd, chip); +} + +static void brcmnand_cmdfunc(struct mtd_info *mtd, unsigned command, + int column, int page_addr) +{ + struct nand_chip *chip = mtd->priv; + struct brcmnand_host *host = chip->priv; + struct brcmnand_controller *ctrl = host->ctrl; + u64 addr = (u64)page_addr << chip->page_shift; + int native_cmd = 0; + + if (command == NAND_CMD_READID || command == NAND_CMD_PARAM || + command == NAND_CMD_RNDOUT) + addr = (u64)column; + /* Avoid propagating a negative, don't-care address */ + else if (page_addr < 0) + addr = 0; + + dev_dbg(ctrl->dev, "cmd 0x%x addr 0x%llx\n", command, + (unsigned long long)addr); + + host->last_cmd = command; + host->last_byte = 0; + host->last_addr = addr; + + switch (command) { + case NAND_CMD_RESET: + native_cmd = CMD_FLASH_RESET; + break; + case NAND_CMD_STATUS: + native_cmd = CMD_STATUS_READ; + break; + case NAND_CMD_READID: + native_cmd = CMD_DEVICE_ID_READ; + break; + case NAND_CMD_READOOB: + native_cmd = CMD_SPARE_AREA_READ; + break; + case NAND_CMD_ERASE1: + native_cmd = CMD_BLOCK_ERASE; + brcmnand_wp(mtd, 0); + break; + case NAND_CMD_PARAM: + native_cmd = CMD_PARAMETER_READ; + break; + case NAND_CMD_SET_FEATURES: + case NAND_CMD_GET_FEATURES: + brcmnand_low_level_op(host, LL_OP_CMD, command, false); + brcmnand_low_level_op(host, LL_OP_ADDR, column, false); + break; + case NAND_CMD_RNDOUT: + native_cmd = CMD_PARAMETER_CHANGE_COL; + addr &= ~((u64)(FC_BYTES - 1)); + /* + * HW quirk: PARAMETER_CHANGE_COL requires SECTOR_SIZE_1K=0 + * NB: hwcfg.sector_size_1k may not be initialized yet + */ + if (brcmnand_get_sector_size_1k(host)) { + host->hwcfg.sector_size_1k = + brcmnand_get_sector_size_1k(host); + brcmnand_set_sector_size_1k(host, 0); + } + break; + } + + if (!native_cmd) + return; + + brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS, + (host->cs << 16) | ((addr >> 32) & 0xffff)); + (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS); + brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS, lower_32_bits(addr)); + (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS); + + brcmnand_send_cmd(host, native_cmd); + brcmnand_waitfunc(mtd, chip); + + if (native_cmd == CMD_PARAMETER_READ || + native_cmd == CMD_PARAMETER_CHANGE_COL) { + int i; + /* + * Must cache the FLASH_CACHE now, since changes in + * SECTOR_SIZE_1K may invalidate it + */ + for (i = 0; i < FC_WORDS; i++) + ctrl->flash_cache[i] = brcmnand_read_fc(ctrl, i); + /* Cleanup from HW quirk: restore SECTOR_SIZE_1K */ + if (host->hwcfg.sector_size_1k) + brcmnand_set_sector_size_1k(host, + host->hwcfg.sector_size_1k); + } + + /* Re-enable protection is necessary only after erase */ + if (command == NAND_CMD_ERASE1) + brcmnand_wp(mtd, 1); +} + +static uint8_t brcmnand_read_byte(struct mtd_info *mtd) +{ + struct nand_chip *chip = mtd->priv; + struct brcmnand_host *host = chip->priv; + struct brcmnand_controller *ctrl = host->ctrl; + uint8_t ret = 0; + int addr, offs; + + switch (host->last_cmd) { + case NAND_CMD_READID: + if (host->last_byte < 4) + ret = brcmnand_read_reg(ctrl, BRCMNAND_ID) >> + (24 - (host->last_byte << 3)); + else if (host->last_byte < 8) + ret = brcmnand_read_reg(ctrl, BRCMNAND_ID_EXT) >> + (56 - (host->last_byte << 3)); + break; + + case NAND_CMD_READOOB: + ret = oob_reg_read(ctrl, host->last_byte); + break; + + case NAND_CMD_STATUS: + ret = brcmnand_read_reg(ctrl, BRCMNAND_INTFC_STATUS) & + INTFC_FLASH_STATUS; + if (wp_on) /* hide WP status */ + ret |= NAND_STATUS_WP; + break; + + case NAND_CMD_PARAM: + case NAND_CMD_RNDOUT: + addr = host->last_addr + host->last_byte; + offs = addr & (FC_BYTES - 1); + + /* At FC_BYTES boundary, switch to next column */ + if (host->last_byte > 0 && offs == 0) + chip->cmdfunc(mtd, NAND_CMD_RNDOUT, addr, -1); + + ret = ctrl->flash_cache[offs >> 2] >> + (24 - ((offs & 0x03) << 3)); + break; + case NAND_CMD_GET_FEATURES: + if (host->last_byte >= ONFI_SUBFEATURE_PARAM_LEN) { + ret = 0; + } else { + bool last = host->last_byte == + ONFI_SUBFEATURE_PARAM_LEN - 1; + brcmnand_low_level_op(host, LL_OP_RD, 0, last); + ret = brcmnand_read_reg(ctrl, BRCMNAND_LL_RDATA) & 0xff; + } + } + + dev_dbg(ctrl->dev, "read byte = 0x%02x\n", ret); + host->last_byte++; + + return ret; +} + +static void brcmnand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) +{ + int i; + + for (i = 0; i < len; i++, buf++) + *buf = brcmnand_read_byte(mtd); +} + +static void brcmnand_write_buf(struct mtd_info *mtd, const uint8_t *buf, + int len) +{ + int i; + struct nand_chip *chip = mtd->priv; + struct brcmnand_host *host = chip->priv; + + switch (host->last_cmd) { + case NAND_CMD_SET_FEATURES: + for (i = 0; i < len; i++) + brcmnand_low_level_op(host, LL_OP_WR, buf[i], + (i + 1) == len); + break; + default: + BUG(); + break; + } +} + +/** + * Construct a FLASH_DMA descriptor as part of a linked list. You must know the + * following ahead of time: + * - Is this descriptor the beginning or end of a linked list? + * - What is the (DMA) address of the next descriptor in the linked list? + */ +static int brcmnand_fill_dma_desc(struct brcmnand_host *host, + struct brcm_nand_dma_desc *desc, u64 addr, + dma_addr_t buf, u32 len, u8 dma_cmd, + bool begin, bool end, + dma_addr_t next_desc) +{ + memset(desc, 0, sizeof(*desc)); + /* Descriptors are written in native byte order (wordwise) */ + desc->next_desc = lower_32_bits(next_desc); + desc->next_desc_ext = upper_32_bits(next_desc); + desc->cmd_irq = (dma_cmd << 24) | + (end ? (0x03 << 8) : 0) | /* IRQ | STOP */ + (!!begin) | ((!!end) << 1); /* head, tail */ +#ifdef CONFIG_CPU_BIG_ENDIAN + desc->cmd_irq |= 0x01 << 12; +#endif + desc->dram_addr = lower_32_bits(buf); + desc->dram_addr_ext = upper_32_bits(buf); + desc->tfr_len = len; + desc->total_len = len; + desc->flash_addr = lower_32_bits(addr); + desc->flash_addr_ext = upper_32_bits(addr); + desc->cs = host->cs; + desc->status_valid = 0x01; + return 0; +} + +/** + * Kick the FLASH_DMA engine, with a given DMA descriptor + */ +static void brcmnand_dma_run(struct brcmnand_host *host, dma_addr_t desc) +{ + struct brcmnand_controller *ctrl = host->ctrl; + unsigned long timeo = msecs_to_jiffies(100); + + flash_dma_writel(ctrl, FLASH_DMA_FIRST_DESC, lower_32_bits(desc)); + (void)flash_dma_readl(ctrl, FLASH_DMA_FIRST_DESC); + flash_dma_writel(ctrl, FLASH_DMA_FIRST_DESC_EXT, upper_32_bits(desc)); + (void)flash_dma_readl(ctrl, FLASH_DMA_FIRST_DESC_EXT); + + /* Start FLASH_DMA engine */ + ctrl->dma_pending = true; + mb(); /* flush previous writes */ + flash_dma_writel(ctrl, FLASH_DMA_CTRL, 0x03); /* wake | run */ + + if (wait_for_completion_timeout(&ctrl->dma_done, timeo) <= 0) { + dev_err(ctrl->dev, + "timeout waiting for DMA; status %#x, error status %#x\n", + flash_dma_readl(ctrl, FLASH_DMA_STATUS), + flash_dma_readl(ctrl, FLASH_DMA_ERROR_STATUS)); + } + ctrl->dma_pending = false; + flash_dma_writel(ctrl, FLASH_DMA_CTRL, 0); /* force stop */ +} + +static int brcmnand_dma_trans(struct brcmnand_host *host, u64 addr, u32 *buf, + u32 len, u8 dma_cmd) +{ + struct brcmnand_controller *ctrl = host->ctrl; + dma_addr_t buf_pa; + int dir = dma_cmd == CMD_PAGE_READ ? DMA_FROM_DEVICE : DMA_TO_DEVICE; + + buf_pa = dma_map_single(ctrl->dev, buf, len, dir); + if (dma_mapping_error(ctrl->dev, buf_pa)) { + dev_err(ctrl->dev, "unable to map buffer for DMA\n"); + return -ENOMEM; + } + + brcmnand_fill_dma_desc(host, ctrl->dma_desc, addr, buf_pa, len, + dma_cmd, true, true, 0); + + brcmnand_dma_run(host, ctrl->dma_pa); + + dma_unmap_single(ctrl->dev, buf_pa, len, dir); + + if (ctrl->dma_desc->status_valid & FLASH_DMA_ECC_ERROR) + return -EBADMSG; + else if (ctrl->dma_desc->status_valid & FLASH_DMA_CORR_ERROR) + return -EUCLEAN; + + return 0; +} + +/* + * Assumes proper CS is already set + */ +static int brcmnand_read_by_pio(struct mtd_info *mtd, struct nand_chip *chip, + u64 addr, unsigned int trans, u32 *buf, + u8 *oob, u64 *err_addr) +{ + struct brcmnand_host *host = chip->priv; + struct brcmnand_controller *ctrl = host->ctrl; + int i, j, ret = 0; + + /* Clear error addresses */ + brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_ADDR, 0); + brcmnand_write_reg(ctrl, BRCMNAND_CORR_ADDR, 0); + + brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS, + (host->cs << 16) | ((addr >> 32) & 0xffff)); + (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS); + + for (i = 0; i < trans; i++, addr += FC_BYTES) { + brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS, + lower_32_bits(addr)); + (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS); + /* SPARE_AREA_READ does not use ECC, so just use PAGE_READ */ + brcmnand_send_cmd(host, CMD_PAGE_READ); + brcmnand_waitfunc(mtd, chip); + + if (likely(buf)) + for (j = 0; j < FC_WORDS; j++, buf++) + *buf = brcmnand_read_fc(ctrl, j); + + if (oob) + oob += read_oob_from_regs(ctrl, i, oob, + mtd->oobsize / trans, + host->hwcfg.sector_size_1k); + + if (!ret) { + *err_addr = brcmnand_read_reg(ctrl, + BRCMNAND_UNCORR_ADDR) | + ((u64)(brcmnand_read_reg(ctrl, + BRCMNAND_UNCORR_EXT_ADDR) + & 0xffff) << 32); + if (*err_addr) + ret = -EBADMSG; + } + + if (!ret) { + *err_addr = brcmnand_read_reg(ctrl, + BRCMNAND_CORR_ADDR) | + ((u64)(brcmnand_read_reg(ctrl, + BRCMNAND_CORR_EXT_ADDR) + & 0xffff) << 32); + if (*err_addr) + ret = -EUCLEAN; + } + } + + return ret; +} + +static int brcmnand_read(struct mtd_info *mtd, struct nand_chip *chip, + u64 addr, unsigned int trans, u32 *buf, u8 *oob) +{ + struct brcmnand_host *host = chip->priv; + struct brcmnand_controller *ctrl = host->ctrl; + u64 err_addr = 0; + int err; + + dev_dbg(ctrl->dev, "read %llx -> %p\n", (unsigned long long)addr, buf); + + brcmnand_write_reg(ctrl, BRCMNAND_UNCORR_COUNT, 0); + + if (has_flash_dma(ctrl) && !oob && flash_dma_buf_ok(buf)) { + err = brcmnand_dma_trans(host, addr, buf, trans * FC_BYTES, + CMD_PAGE_READ); + if (err) { + if (mtd_is_bitflip_or_eccerr(err)) + err_addr = addr; + else + return -EIO; + } + } else { + if (oob) + memset(oob, 0x99, mtd->oobsize); + + err = brcmnand_read_by_pio(mtd, chip, addr, trans, buf, + oob, &err_addr); + } + + if (mtd_is_eccerr(err)) { + dev_dbg(ctrl->dev, "uncorrectable error at 0x%llx\n", + (unsigned long long)err_addr); + mtd->ecc_stats.failed++; + /* NAND layer expects zero on ECC errors */ + return 0; + } + + if (mtd_is_bitflip(err)) { + unsigned int corrected = brcmnand_count_corrected(ctrl); + + dev_dbg(ctrl->dev, "corrected error at 0x%llx\n", + (unsigned long long)err_addr); + mtd->ecc_stats.corrected += corrected; + /* Always exceed the software-imposed threshold */ + return max(mtd->bitflip_threshold, corrected); + } + + return 0; +} + +static int brcmnand_read_page(struct mtd_info *mtd, struct nand_chip *chip, + uint8_t *buf, int oob_required, int page) +{ + struct brcmnand_host *host = chip->priv; + u8 *oob = oob_required ? (u8 *)chip->oob_poi : NULL; + + return brcmnand_read(mtd, chip, host->last_addr, + mtd->writesize >> FC_SHIFT, (u32 *)buf, oob); +} + +static int brcmnand_read_page_raw(struct mtd_info *mtd, struct nand_chip *chip, + uint8_t *buf, int oob_required, int page) +{ + struct brcmnand_host *host = chip->priv; + u8 *oob = oob_required ? (u8 *)chip->oob_poi : NULL; + int ret; + + brcmnand_set_ecc_enabled(host, 0); + ret = brcmnand_read(mtd, chip, host->last_addr, + mtd->writesize >> FC_SHIFT, (u32 *)buf, oob); + brcmnand_set_ecc_enabled(host, 1); + return ret; +} + +static int brcmnand_read_oob(struct mtd_info *mtd, struct nand_chip *chip, + int page) +{ + return brcmnand_read(mtd, chip, (u64)page << chip->page_shift, + mtd->writesize >> FC_SHIFT, + NULL, (u8 *)chip->oob_poi); +} + +static int brcmnand_read_oob_raw(struct mtd_info *mtd, struct nand_chip *chip, + int page) +{ + struct brcmnand_host *host = chip->priv; + + brcmnand_set_ecc_enabled(host, 0); + brcmnand_read(mtd, chip, (u64)page << chip->page_shift, + mtd->writesize >> FC_SHIFT, + NULL, (u8 *)chip->oob_poi); + brcmnand_set_ecc_enabled(host, 1); + return 0; +} + +static int brcmnand_read_subpage(struct mtd_info *mtd, struct nand_chip *chip, + uint32_t data_offs, uint32_t readlen, + uint8_t *bufpoi, int page) +{ + struct brcmnand_host *host = chip->priv; + + return brcmnand_read(mtd, chip, host->last_addr + data_offs, + readlen >> FC_SHIFT, (u32 *)bufpoi, NULL); +} + +static int brcmnand_write(struct mtd_info *mtd, struct nand_chip *chip, + u64 addr, const u32 *buf, u8 *oob) +{ + struct brcmnand_host *host = chip->priv; + struct brcmnand_controller *ctrl = host->ctrl; + unsigned int i, j, trans = mtd->writesize >> FC_SHIFT; + int status, ret = 0; + + dev_dbg(ctrl->dev, "write %llx <- %p\n", (unsigned long long)addr, buf); + + if (unlikely((u32)buf & 0x03)) { + dev_warn(ctrl->dev, "unaligned buffer: %p\n", buf); + buf = (u32 *)((u32)buf & ~0x03); + } + + brcmnand_wp(mtd, 0); + + for (i = 0; i < ctrl->max_oob; i += 4) + oob_reg_write(ctrl, i, 0xffffffff); + + if (has_flash_dma(ctrl) && !oob && flash_dma_buf_ok(buf)) { + if (brcmnand_dma_trans(host, addr, (u32 *)buf, + mtd->writesize, CMD_PROGRAM_PAGE)) + ret = -EIO; + goto out; + } + + brcmnand_write_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS, + (host->cs << 16) | ((addr >> 32) & 0xffff)); + (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_EXT_ADDRESS); + + for (i = 0; i < trans; i++, addr += FC_BYTES) { + /* full address MUST be set before populating FC */ + brcmnand_write_reg(ctrl, BRCMNAND_CMD_ADDRESS, + lower_32_bits(addr)); + (void)brcmnand_read_reg(ctrl, BRCMNAND_CMD_ADDRESS); + + if (buf) + for (j = 0; j < FC_WORDS; j++, buf++) + brcmnand_write_fc(ctrl, j, *buf); + else if (oob) + for (j = 0; j < FC_WORDS; j++) + brcmnand_write_fc(ctrl, j, 0xffffffff); + + if (oob) { + oob += write_oob_to_regs(ctrl, i, oob, + mtd->oobsize / trans, + host->hwcfg.sector_size_1k); + } + + /* we cannot use SPARE_AREA_PROGRAM when PARTIAL_PAGE_EN=0 */ + brcmnand_send_cmd(host, CMD_PROGRAM_PAGE); + status = brcmnand_waitfunc(mtd, chip); + + if (status & NAND_STATUS_FAIL) { + dev_info(ctrl->dev, "program failed at %llx\n", + (unsigned long long)addr); + ret = -EIO; + goto out; + } + } +out: + brcmnand_wp(mtd, 1); + return ret; +} + +static int brcmnand_write_page(struct mtd_info *mtd, struct nand_chip *chip, + const uint8_t *buf, int oob_required) +{ + struct brcmnand_host *host = chip->priv; + void *oob = oob_required ? chip->oob_poi : NULL; + + brcmnand_write(mtd, chip, host->last_addr, (const u32 *)buf, oob); + return 0; +} + +static int brcmnand_write_page_raw(struct mtd_info *mtd, + struct nand_chip *chip, const uint8_t *buf, + int oob_required) +{ + struct brcmnand_host *host = chip->priv; + void *oob = oob_required ? chip->oob_poi : NULL; + + brcmnand_set_ecc_enabled(host, 0); + brcmnand_write(mtd, chip, host->last_addr, (const u32 *)buf, oob); + brcmnand_set_ecc_enabled(host, 1); + return 0; +} + +static int brcmnand_write_oob(struct mtd_info *mtd, struct nand_chip *chip, + int page) +{ + return brcmnand_write(mtd, chip, (u64)page << chip->page_shift, + NULL, chip->oob_poi); +} + +static int brcmnand_write_oob_raw(struct mtd_info *mtd, struct nand_chip *chip, + int page) +{ + struct brcmnand_host *host = chip->priv; + int ret; + + brcmnand_set_ecc_enabled(host, 0); + ret = brcmnand_write(mtd, chip, (u64)page << chip->page_shift, NULL, + (u8 *)chip->oob_poi); + brcmnand_set_ecc_enabled(host, 1); + + return ret; +} + +/*********************************************************************** + * Per-CS setup (1 NAND device) + ***********************************************************************/ + +static int brcmnand_set_cfg(struct brcmnand_host *host, + struct brcmnand_cfg *cfg) +{ + struct brcmnand_controller *ctrl = host->ctrl; + struct nand_chip *chip = &host->chip; + u16 cfg_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_CFG); + u16 cfg_ext_offs = brcmnand_cs_offset(ctrl, host->cs, + BRCMNAND_CS_CFG_EXT); + u16 acc_control_offs = brcmnand_cs_offset(ctrl, host->cs, + BRCMNAND_CS_ACC_CONTROL); + u8 block_size = 0, page_size = 0, device_size = 0; + u32 tmp; + + if (ctrl->block_sizes) { + int i, found; + + for (i = 0, found = 0; ctrl->block_sizes[i]; i++) + if (ctrl->block_sizes[i] * 1024 == cfg->block_size) { + block_size = i; + found = 1; + } + if (!found) { + dev_warn(ctrl->dev, "invalid block size %u\n", + cfg->block_size); + return -EINVAL; + } + } else { + block_size = ffs(cfg->block_size) - ffs(BRCMNAND_MIN_BLOCKSIZE); + } + + if (cfg->block_size < BRCMNAND_MIN_BLOCKSIZE || (ctrl->max_block_size && + cfg->block_size > ctrl->max_block_size)) { + dev_warn(ctrl->dev, "invalid block size %u\n", + cfg->block_size); + block_size = 0; + } + + if (ctrl->page_sizes) { + int i, found; + + for (i = 0, found = 0; ctrl->page_sizes[i]; i++) + if (ctrl->page_sizes[i] == cfg->page_size) { + page_size = i; + found = 1; + } + if (!found) { + dev_warn(ctrl->dev, "invalid page size %u\n", + cfg->page_size); + return -EINVAL; + } + } else { + page_size = ffs(cfg->page_size) - ffs(BRCMNAND_MIN_PAGESIZE); + } + + if (cfg->page_size < BRCMNAND_MIN_PAGESIZE || (ctrl->max_page_size && + cfg->page_size > ctrl->max_page_size)) { + dev_warn(ctrl->dev, "invalid page size %u\n", cfg->page_size); + return -EINVAL; + } + + if (fls64(cfg->device_size) < fls64(BRCMNAND_MIN_DEVSIZE)) { + dev_warn(ctrl->dev, "invalid device size 0x%llx\n", + (unsigned long long)cfg->device_size); + return -EINVAL; + } + device_size = fls64(cfg->device_size) - fls64(BRCMNAND_MIN_DEVSIZE); + + tmp = (cfg->blk_adr_bytes << 8) | + (cfg->col_adr_bytes << 12) | + (cfg->ful_adr_bytes << 16) | + (!!(cfg->device_width == 16) << 23) | + (device_size << 24); + if (cfg_offs == cfg_ext_offs) { + tmp |= (page_size << 20) | (block_size << 28); + nand_writereg(ctrl, cfg_offs, tmp); + } else { + nand_writereg(ctrl, cfg_offs, tmp); + tmp = page_size | (block_size << 4); + nand_writereg(ctrl, cfg_ext_offs, tmp); + } + + tmp = nand_readreg(ctrl, acc_control_offs); + tmp &= ~brcmnand_ecc_level_mask(ctrl); + tmp |= cfg->ecc_level << NAND_ACC_CONTROL_ECC_SHIFT; + tmp &= ~brcmnand_spare_area_mask(ctrl); + tmp |= cfg->spare_area_size; + nand_writereg(ctrl, acc_control_offs, tmp); + + brcmnand_set_sector_size_1k(host, cfg->sector_size_1k); + + /* threshold = ceil(BCH-level * 0.75) */ + brcmnand_wr_corr_thresh(host, DIV_ROUND_UP(chip->ecc.strength * 3, 4)); + + return 0; +} + +static void brcmnand_print_cfg(char *buf, struct brcmnand_cfg *cfg) +{ + buf += sprintf(buf, + "%lluMiB total, %uKiB blocks, %u%s pages, %uB OOB, %u-bit", + (unsigned long long)cfg->device_size >> 20, + cfg->block_size >> 10, + cfg->page_size >= 1024 ? cfg->page_size >> 10 : cfg->page_size, + cfg->page_size >= 1024 ? "KiB" : "B", + cfg->spare_area_size, cfg->device_width); + + /* Account for Hamming ECC and for BCH 512B vs 1KiB sectors */ + if (is_hamming_ecc(cfg)) + sprintf(buf, ", Hamming ECC"); + else if (cfg->sector_size_1k) + sprintf(buf, ", BCH-%u (1KiB sector)", cfg->ecc_level << 1); + else + sprintf(buf, ", BCH-%u\n", cfg->ecc_level); +} + +/* + * Minimum number of bytes to address a page. Calculated as: + * roundup(log2(size / page-size) / 8) + * + * NB: the following does not "round up" for non-power-of-2 'size'; but this is + * OK because many other things will break if 'size' is irregular... + */ +static inline int get_blk_adr_bytes(u64 size, u32 writesize) +{ + return ALIGN(ilog2(size) - ilog2(writesize), 8) >> 3; +} + +static int brcmnand_setup_dev(struct brcmnand_host *host) +{ + struct mtd_info *mtd = &host->mtd; + struct nand_chip *chip = &host->chip; + struct brcmnand_controller *ctrl = host->ctrl; + struct brcmnand_cfg *cfg = &host->hwcfg; + char msg[128]; + u32 offs, tmp, oob_sector; + int ret; + + memset(cfg, 0, sizeof(*cfg)); + + ret = of_property_read_u32(chip->dn, "brcm,nand-oob-sector-size", + &oob_sector); + if (ret) { + /* Use detected size */ + cfg->spare_area_size = mtd->oobsize / + (mtd->writesize >> FC_SHIFT); + } else { + cfg->spare_area_size = oob_sector; + } + if (cfg->spare_area_size > ctrl->max_oob) + cfg->spare_area_size = ctrl->max_oob; + /* + * Set oobsize to be consistent with controller's spare_area_size, as + * the rest is inaccessible. + */ + mtd->oobsize = cfg->spare_area_size * (mtd->writesize >> FC_SHIFT); + + cfg->device_size = mtd->size; + cfg->block_size = mtd->erasesize; + cfg->page_size = mtd->writesize; + cfg->device_width = (chip->options & NAND_BUSWIDTH_16) ? 16 : 8; + cfg->col_adr_bytes = 2; + cfg->blk_adr_bytes = get_blk_adr_bytes(mtd->size, mtd->writesize); + + switch (chip->ecc.size) { + case 512: + if (chip->ecc.strength == 1) /* Hamming */ + cfg->ecc_level = 15; + else + cfg->ecc_level = chip->ecc.strength; + cfg->sector_size_1k = 0; + break; + case 1024: + if (!(ctrl->features & BRCMNAND_HAS_1K_SECTORS)) { + dev_err(ctrl->dev, "1KB sectors not supported\n"); + return -EINVAL; + } + if (chip->ecc.strength & 0x1) { + dev_err(ctrl->dev, + "odd ECC not supported with 1KB sectors\n"); + return -EINVAL; + } + + cfg->ecc_level = chip->ecc.strength >> 1; + cfg->sector_size_1k = 1; + break; + default: + dev_err(ctrl->dev, "unsupported ECC size: %d\n", + chip->ecc.size); + return -EINVAL; + } + + cfg->ful_adr_bytes = cfg->blk_adr_bytes; + if (mtd->writesize > 512) + cfg->ful_adr_bytes += cfg->col_adr_bytes; + else + cfg->ful_adr_bytes += 1; + + ret = brcmnand_set_cfg(host, cfg); + if (ret) + return ret; + + brcmnand_set_ecc_enabled(host, 1); + + brcmnand_print_cfg(msg, cfg); + dev_info(ctrl->dev, "detected %s\n", msg); + + /* Configure ACC_CONTROL */ + offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_ACC_CONTROL); + tmp = nand_readreg(ctrl, offs); + tmp &= ~ACC_CONTROL_PARTIAL_PAGE; + tmp &= ~ACC_CONTROL_RD_ERASED; + tmp &= ~ACC_CONTROL_FAST_PGM_RDIN; + if (ctrl->features & BRCMNAND_HAS_PREFETCH) { + /* + * FIXME: Flash DMA + prefetch may see spurious erased-page ECC + * errors + */ + if (has_flash_dma(ctrl)) + tmp &= ~ACC_CONTROL_PREFETCH; + else + tmp |= ACC_CONTROL_PREFETCH; + } + nand_writereg(ctrl, offs, tmp); + + return 0; +} + +static int brcmnand_init_cs(struct brcmnand_host *host) +{ + struct brcmnand_controller *ctrl = host->ctrl; + struct device_node *dn = host->of_node; + struct platform_device *pdev = host->pdev; + struct mtd_info *mtd; + struct nand_chip *chip; + int ret = 0; + struct mtd_part_parser_data ppdata = { .of_node = dn }; + + ret = of_property_read_u32(dn, "reg", &host->cs); + if (ret) { + dev_err(&pdev->dev, "can't get chip-select\n"); + return -ENXIO; + } + + mtd = &host->mtd; + chip = &host->chip; + + chip->dn = dn; + chip->priv = host; + mtd->priv = chip; + mtd->name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "brcmnand.%d", + host->cs); + mtd->owner = THIS_MODULE; + mtd->dev.parent = &pdev->dev; + + chip->IO_ADDR_R = (void __iomem *)0xdeadbeef; + chip->IO_ADDR_W = (void __iomem *)0xdeadbeef; + + chip->cmd_ctrl = brcmnand_cmd_ctrl; + chip->cmdfunc = brcmnand_cmdfunc; + chip->waitfunc = brcmnand_waitfunc; + chip->read_byte = brcmnand_read_byte; + chip->read_buf = brcmnand_read_buf; + chip->write_buf = brcmnand_write_buf; + + chip->ecc.mode = NAND_ECC_HW; + chip->ecc.read_page = brcmnand_read_page; + chip->ecc.read_subpage = brcmnand_read_subpage; + chip->ecc.write_page = brcmnand_write_page; + chip->ecc.read_page_raw = brcmnand_read_page_raw; + chip->ecc.write_page_raw = brcmnand_write_page_raw; + chip->ecc.write_oob_raw = brcmnand_write_oob_raw; + chip->ecc.read_oob_raw = brcmnand_read_oob_raw; + chip->ecc.read_oob = brcmnand_read_oob; + chip->ecc.write_oob = brcmnand_write_oob; + + chip->controller = &ctrl->controller; + + if (nand_scan_ident(mtd, 1, NULL)) + return -ENXIO; + + chip->options |= NAND_NO_SUBPAGE_WRITE; + /* + * Avoid (for instance) kmap()'d buffers from JFFS2, which we can't DMA + * to/from, and have nand_base pass us a bounce buffer instead, as + * needed. + */ + chip->options |= NAND_USE_BOUNCE_BUFFER; + + if (of_get_nand_on_flash_bbt(dn)) + chip->bbt_options |= NAND_BBT_USE_FLASH | NAND_BBT_NO_OOB; + + if (brcmnand_setup_dev(host)) + return -ENXIO; + + chip->ecc.size = host->hwcfg.sector_size_1k ? 1024 : 512; + /* only use our internal HW threshold */ + mtd->bitflip_threshold = 1; + + chip->ecc.layout = brcmstb_choose_ecc_layout(host); + if (!chip->ecc.layout) + return -ENXIO; + + if (nand_scan_tail(mtd)) + return -ENXIO; + + return mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0); +} + +static void brcmnand_save_restore_cs_config(struct brcmnand_host *host, + int restore) +{ + struct brcmnand_controller *ctrl = host->ctrl; + u16 cfg_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_CFG); + u16 cfg_ext_offs = brcmnand_cs_offset(ctrl, host->cs, + BRCMNAND_CS_CFG_EXT); + u16 acc_control_offs = brcmnand_cs_offset(ctrl, host->cs, + BRCMNAND_CS_ACC_CONTROL); + u16 t1_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_TIMING1); + u16 t2_offs = brcmnand_cs_offset(ctrl, host->cs, BRCMNAND_CS_TIMING2); + + if (restore) { + nand_writereg(ctrl, cfg_offs, host->hwcfg.config); + if (cfg_offs != cfg_ext_offs) + nand_writereg(ctrl, cfg_ext_offs, + host->hwcfg.config_ext); + nand_writereg(ctrl, acc_control_offs, host->hwcfg.acc_control); + nand_writereg(ctrl, t1_offs, host->hwcfg.timing_1); + nand_writereg(ctrl, t2_offs, host->hwcfg.timing_2); + } else { + host->hwcfg.config = nand_readreg(ctrl, cfg_offs); + if (cfg_offs != cfg_ext_offs) + host->hwcfg.config_ext = + nand_readreg(ctrl, cfg_ext_offs); + host->hwcfg.acc_control = nand_readreg(ctrl, acc_control_offs); + host->hwcfg.timing_1 = nand_readreg(ctrl, t1_offs); + host->hwcfg.timing_2 = nand_readreg(ctrl, t2_offs); + } +} + +static int brcmnand_suspend(struct device *dev) +{ + struct brcmnand_controller *ctrl = dev_get_drvdata(dev); + struct brcmnand_host *host; + + list_for_each_entry(host, &ctrl->host_list, node) + brcmnand_save_restore_cs_config(host, 0); + + ctrl->nand_cs_nand_select = brcmnand_read_reg(ctrl, BRCMNAND_CS_SELECT); + ctrl->nand_cs_nand_xor = brcmnand_read_reg(ctrl, BRCMNAND_CS_XOR); + ctrl->corr_stat_threshold = + brcmnand_read_reg(ctrl, BRCMNAND_CORR_THRESHOLD); + + if (has_flash_dma(ctrl)) + ctrl->flash_dma_mode = flash_dma_readl(ctrl, FLASH_DMA_MODE); + + return 0; +} + +static int brcmnand_resume(struct device *dev) +{ + struct brcmnand_controller *ctrl = dev_get_drvdata(dev); + struct brcmnand_host *host; + + if (has_flash_dma(ctrl)) { + flash_dma_writel(ctrl, FLASH_DMA_MODE, ctrl->flash_dma_mode); + flash_dma_writel(ctrl, FLASH_DMA_ERROR_STATUS, 0); + } + + brcmnand_write_reg(ctrl, BRCMNAND_CS_SELECT, ctrl->nand_cs_nand_select); + brcmnand_write_reg(ctrl, BRCMNAND_CS_XOR, ctrl->nand_cs_nand_xor); + brcmnand_write_reg(ctrl, BRCMNAND_CORR_THRESHOLD, + ctrl->corr_stat_threshold); + + list_for_each_entry(host, &ctrl->host_list, node) { + struct mtd_info *mtd = &host->mtd; + struct nand_chip *chip = mtd->priv; + + brcmnand_save_restore_cs_config(host, 1); + + /* Reset the chip, required by some chips after power-up */ + chip->cmdfunc(mtd, NAND_CMD_RESET, -1, -1); + } + + return 0; +} + +const struct dev_pm_ops brcmnand_pm_ops = { + .suspend = brcmnand_suspend, + .resume = brcmnand_resume, +}; +EXPORT_SYMBOL_GPL(brcmnand_pm_ops); + +static const struct of_device_id brcmnand_of_match[] = { + { .compatible = "brcm,brcmnand-v4.0" }, + { .compatible = "brcm,brcmnand-v5.0" }, + { .compatible = "brcm,brcmnand-v6.0" }, + { .compatible = "brcm,brcmnand-v6.1" }, + { .compatible = "brcm,brcmnand-v7.0" }, + { .compatible = "brcm,brcmnand-v7.1" }, + {}, +}; +MODULE_DEVICE_TABLE(of, brcmnand_of_match); + +/*********************************************************************** + * Platform driver setup (per controller) + ***********************************************************************/ + +int brcmnand_probe(struct platform_device *pdev, struct brcmnand_soc *soc) +{ + struct device *dev = &pdev->dev; + struct device_node *dn = dev->of_node, *child; + static struct brcmnand_controller *ctrl; + struct resource *res; + int ret; + + /* We only support device-tree instantiation */ + if (!dn) + return -ENODEV; + + if (!of_match_node(brcmnand_of_match, dn)) + return -ENODEV; + + ctrl = devm_kzalloc(dev, sizeof(*ctrl), GFP_KERNEL); + if (!ctrl) + return -ENOMEM; + + dev_set_drvdata(dev, ctrl); + ctrl->dev = dev; + + init_completion(&ctrl->done); + init_completion(&ctrl->dma_done); + spin_lock_init(&ctrl->controller.lock); + init_waitqueue_head(&ctrl->controller.wq); + INIT_LIST_HEAD(&ctrl->host_list); + + /* NAND register range */ + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + ctrl->nand_base = devm_ioremap_resource(dev, res); + if (IS_ERR(ctrl->nand_base)) + return PTR_ERR(ctrl->nand_base); + + /* Initialize NAND revision */ + ret = brcmnand_revision_init(ctrl); + if (ret) + return ret; + + /* + * Most chips have this cache at a fixed offset within 'nand' block. + * Some must specify this region separately. + */ + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "nand-cache"); + if (res) { + ctrl->nand_fc = devm_ioremap_resource(dev, res); + if (IS_ERR(ctrl->nand_fc)) + return PTR_ERR(ctrl->nand_fc); + } else { + ctrl->nand_fc = ctrl->nand_base + + ctrl->reg_offsets[BRCMNAND_FC_BASE]; + } + + /* FLASH_DMA */ + res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "flash-dma"); + if (res) { + ctrl->flash_dma_base = devm_ioremap_resource(dev, res); + if (IS_ERR(ctrl->flash_dma_base)) + return PTR_ERR(ctrl->flash_dma_base); + + flash_dma_writel(ctrl, FLASH_DMA_MODE, 1); /* linked-list */ + flash_dma_writel(ctrl, FLASH_DMA_ERROR_STATUS, 0); + + /* Allocate descriptor(s) */ + ctrl->dma_desc = dmam_alloc_coherent(dev, + sizeof(*ctrl->dma_desc), + &ctrl->dma_pa, GFP_KERNEL); + if (!ctrl->dma_desc) + return -ENOMEM; + + ctrl->dma_irq = platform_get_irq(pdev, 1); + if ((int)ctrl->dma_irq < 0) { + dev_err(dev, "missing FLASH_DMA IRQ\n"); + return -ENODEV; + } + + ret = devm_request_irq(dev, ctrl->dma_irq, + brcmnand_dma_irq, 0, DRV_NAME, + ctrl); + if (ret < 0) { + dev_err(dev, "can't allocate IRQ %d: error %d\n", + ctrl->dma_irq, ret); + return ret; + } + + dev_info(dev, "enabling FLASH_DMA\n"); + } + + /* Disable automatic device ID config, direct addressing */ + brcmnand_rmw_reg(ctrl, BRCMNAND_CS_SELECT, + CS_SELECT_AUTO_DEVICE_ID_CFG | 0xff, 0, 0); + /* Disable XOR addressing */ + brcmnand_rmw_reg(ctrl, BRCMNAND_CS_XOR, 0xff, 0, 0); + + if (ctrl->features & BRCMNAND_HAS_WP) { + /* Permanently disable write protection */ + if (wp_on == 2) + brcmnand_set_wp(ctrl, false); + } else { + wp_on = 0; + } + + /* IRQ */ + ctrl->irq = platform_get_irq(pdev, 0); + if ((int)ctrl->irq < 0) { + dev_err(dev, "no IRQ defined\n"); + return -ENODEV; + } + + ret = devm_request_irq(dev, ctrl->irq, brcmnand_ctlrdy_irq, 0, + DRV_NAME, ctrl); + if (ret < 0) { + dev_err(dev, "can't allocate IRQ %d: error %d\n", + ctrl->irq, ret); + return ret; + } + + for_each_available_child_of_node(dn, child) { + if (of_device_is_compatible(child, "brcm,nandcs")) { + struct brcmnand_host *host; + + host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL); + if (!host) + return -ENOMEM; + host->pdev = pdev; + host->ctrl = ctrl; + host->of_node = child; + + ret = brcmnand_init_cs(host); + if (ret) + continue; /* Try all chip-selects */ + + list_add_tail(&host->node, &ctrl->host_list); + } + } + + /* No chip-selects could initialize properly */ + if (list_empty(&ctrl->host_list)) + return -ENODEV; + + return 0; +} +EXPORT_SYMBOL_GPL(brcmnand_probe); + +int brcmnand_remove(struct platform_device *pdev) +{ + struct brcmnand_controller *ctrl = dev_get_drvdata(&pdev->dev); + struct brcmnand_host *host; + + list_for_each_entry(host, &ctrl->host_list, node) + nand_release(&host->mtd); + + dev_set_drvdata(&pdev->dev, NULL); + + return 0; +} +EXPORT_SYMBOL_GPL(brcmnand_remove); + +MODULE_LICENSE("GPL v2"); +MODULE_AUTHOR("Kevin Cernekee"); +MODULE_AUTHOR("Brian Norris"); +MODULE_DESCRIPTION("NAND driver for Broadcom chips"); +MODULE_ALIAS("platform:brcmnand"); diff --git a/drivers/mtd/nand/brcmnand/brcmnand.h b/drivers/mtd/nand/brcmnand/brcmnand.h new file mode 100644 index 000000000000..5118b29555f0 --- /dev/null +++ b/drivers/mtd/nand/brcmnand/brcmnand.h @@ -0,0 +1,58 @@ +/* + * Copyright © 2015 Broadcom Corporation + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + */ + +#ifndef __BRCMNAND_H__ +#define __BRCMNAND_H__ + +#include <linux/types.h> +#include <linux/io.h> + +struct platform_device; +struct dev_pm_ops; + +struct brcmnand_soc { + struct platform_device *pdev; + void *priv; +}; + +static inline u32 brcmnand_readl(void __iomem *addr) +{ + /* + * MIPS endianness is configured by boot strap, which also reverses all + * bus endianness (i.e., big-endian CPU + big endian bus ==> native + * endian I/O). + * + * Other architectures (e.g., ARM) either do not support big endian, or + * else leave I/O in little endian mode. + */ + if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(__BIG_ENDIAN)) + return __raw_readl(addr); + else + return readl_relaxed(addr); +} + +static inline void brcmnand_writel(u32 val, void __iomem *addr) +{ + /* See brcmnand_readl() comments */ + if (IS_ENABLED(CONFIG_MIPS) && IS_ENABLED(__BIG_ENDIAN)) + __raw_writel(val, addr); + else + writel_relaxed(val, addr); +} + +int brcmnand_probe(struct platform_device *pdev, struct brcmnand_soc *soc); +int brcmnand_remove(struct platform_device *pdev); + +extern const struct dev_pm_ops brcmnand_pm_ops; + +#endif /* __BRCMNAND_H__ */ |