Hi 赵仪峰, 赵仪峰 <[email protected]> wrote on Fri, 30 Oct 2020 18:12:52 +0800:
> Hi Miquel, > > >Hi Yifeng, > > > >A few more comments below, but overall looks better. > > > >Yifeng Zhao <[email protected]> wrote on Wed, 28 Oct 2020 > >17:53:24 +0800: > > > >> This driver supports Rockchip NFC (NAND Flash Controller) found on RK3308, > >> RK2928, RKPX30, RV1108 and other SOCs. The driver has been tested using > >> 8-bit NAND interface on the ARM based RK3308 platform. > >> > >> Support Rockchip SoCs and NFC versions: > >> - PX30 and RK3326(NFCv900). > >> ECC: 16/40/60/70 bits/1KB. > >> CLOCK: ahb and nfc. > >> - RK3308 and RV1108(NFCv800). > >> ECC: 16 bits/1KB. > >> CLOCK: ahb and nfc. > >> - RK3036 and RK3128(NFCv622). > >> ECC: 16/24/40/60 bits/1KB. > >> CLOCK: ahb and nfc. > >> - RK3066, RK3188 and RK2928(NFCv600). > >> ECC: 16/24/40/60 bits/1KB. > >> CLOCK: ahb. > >> > >> Supported features: > >> - Read full page data by DMA. > >> - Support HW ECC(one step is 1KB). > >> - Support 2 - 32K page size. > >> - Support 8 CS(depend on SoCs) > >> > >> Limitations: > >> - No support for the ecc step size is 512. > >> - Untested on some SoCs. > >> - No support for subpages. > >> - No support for the builtin randomizer. > >> - The original bad block mask is not supported. It is recommended to use > >> the BBT(bad block table). > >> > >> Signed-off-by: Yifeng Zhao <[email protected]> > >> --- > >> > >> Changes in v13: > >> - The nfc->buffer will realloc while the page size of the second mtd > >> is large than the first one. > >> - Fix coding style. > >> - Fix some comments. > >> > >> Changes in v12: None > >> Changes in v11: > >> - Fix compile error. > >> > >> Changes in v10: > >> - Fix compile error on master v5.9-rc7. > >> > >> Changes in v9: > >> - The nfc->buffer will realloc while the page size of the second mtd > >> is large than the first one > >> - Fix coding style. > >> - Remove struct rk_nfc_clk. > >> - Prepend some function with rk_nfc_. > >> - Replace function readl_poll_timeout_atomic with > >> readl_relaxed_poll_timeout. > >> - Remove function rk_nfc_read_byte and rk_nfc_write_byte. > >> - Don't select the die if 'check_only == true' in function rk_nfc_exec_op. > >> - Modify function rk_nfc_write_page and rk_nfc_write_page_raw. > >> > >> Changes in v8: None > >> Changes in v7: > >> - Rebase to linux-next. > >> - Fix coding style. > >> - Reserved 4 bytes at the beginning of the oob area. > >> - Page raw read and write included ecc data. > >> > >> Changes in v6: > >> - The mtd->name set by NAND label property. > >> - Add some comments. > >> - Fix compile error. > >> > >> Changes in v5: > >> - Add boot blocks support with different ECC for bootROM. > >> - Rename rockchip-nand.c to rockchip-nand-controller.c. > >> - Unification of other variable names. > >> - Remove some compatible define. > >> > >> Changes in v4: > >> - Define platform data structure for the register offsets. > >> - The compatible define with rkxx_nfc. > >> - Use SET_SYSTEM_SLEEP_PM_OPS to define PM_OPS. > >> - Use exec_op instead of legacy hooks. > >> > >> Changes in v3: None > >> Changes in v2: > >> - Fix compile error. > >> - Include header files sorted by file name. > >> > >> drivers/mtd/nand/raw/Kconfig | 12 + > >> drivers/mtd/nand/raw/Makefile | 1 + > >> .../mtd/nand/raw/rockchip-nand-controller.c | 1460 +++++++++++++++++ > >> 3 files changed, 1473 insertions(+) > >> create mode 100644 drivers/mtd/nand/raw/rockchip-nand-controller.c > >> > >> diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig > >> index 6c46f25b57e2..2cc533e4e239 100644 > >> --- a/drivers/mtd/nand/raw/Kconfig > >> +++ b/drivers/mtd/nand/raw/Kconfig > >> @@ -462,6 +462,18 @@ config MTD_NAND_ARASAN > >> Enables the driver for the Arasan NAND flash controller on > >> Zynq Ultrascale+ MPSoC. > >> > >> +config MTD_NAND_ROCKCHIP > >> + tristate "Rockchip NAND controller" > >> + depends on ARCH_ROCKCHIP && HAS_IOMEM > >> + help > >> + Enables support for NAND controller on Rockchip SoCs. > >> + There are four different versions of NAND FLASH Controllers, > >> + including: > >> + NFC v600: RK2928, RK3066, RK3188 > >> + NFC v622: RK3036, RK3128 > >> + NFC v800: RK3308, RV1108 > >> + NFC v900: PX30, RK3326 > >> + > >> comment "Misc" > >> > >> config MTD_SM_COMMON > >> diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile > >> index 2930f5b9015d..960c9be25204 100644 > >> --- a/drivers/mtd/nand/raw/Makefile > >> +++ b/drivers/mtd/nand/raw/Makefile > >> @@ -58,6 +58,7 @@ obj-$(CONFIG_MTD_NAND_STM32_FMC2) += > >> stm32_fmc2_nand.o > >> obj-$(CONFIG_MTD_NAND_MESON) += meson_nand.o > >> obj-$(CONFIG_MTD_NAND_CADENCE) += cadence-nand-controller.o > >> obj-$(CONFIG_MTD_NAND_ARASAN) += arasan-nand-controller.o > >> +obj-$(CONFIG_MTD_NAND_ROCKCHIP) += rockchip-nand-controller.o > >> > >> nand-objs := nand_base.o nand_legacy.o nand_bbt.o nand_timings.o > >>nand_ids.o > >> nand-objs += nand_onfi.o > >> diff --git a/drivers/mtd/nand/raw/rockchip-nand-controller.c > >> b/drivers/mtd/nand/raw/rockchip-nand-controller.c > >> new file mode 100644 > >> index 000000000000..2e96fd314346 > >> --- /dev/null > >> +++ b/drivers/mtd/nand/raw/rockchip-nand-controller.c > >> @@ -0,0 +1,1460 @@ > >> +// SPDX-License-Identifier: GPL-2.0 OR MIT > >> +/* > >> + * Rockchip NAND Flash controller driver. > >> + * Copyright (C) 2020 Rockchip Inc. > >> + * Author: Yifeng Zhao <[email protected]> > >> + */ > >> + > >> +#include <linux/clk.h> > >> +#include <linux/delay.h> > >> +#include <linux/dma-mapping.h> > >> +#include <linux/dmaengine.h> > >> +#include <linux/interrupt.h> > >> +#include <linux/iopoll.h> > >> +#include <linux/module.h> > >> +#include <linux/mtd/mtd.h> > >> +#include <linux/mtd/rawnand.h> > >> +#include <linux/of.h> > >> +#include <linux/of_device.h> > >> +#include <linux/platform_device.h> > >> +#include <linux/slab.h> > >> + > >> +/* > >> + * NFC Page Data Layout: > >> + * 1024 Bytes Data + 4Bytes sys data + 28Bytes~124Bytes ecc + > >> + * 1024 Bytes Data + 4Bytes sys data + 28Bytes~124Bytes ecc + > >> + * ...... > >> + * NAND Page Data Layout: > >> + * 1024 * n Data + m Bytes oob > >> + * Original Bad Block Mask Location: > >> + * First byte of oob(spare). > >> + * nand_chip->oob_poi data layout: > >> + * 4Bytes sys data + .... + 4Bytes sys data + ecc data. > >> + */ > >> + > >> +/* NAND controller register definition */ > >> +#define NFC_READ (0) > >> +#define NFC_WRITE (1) > >> + > >> +#define NFC_FMCTL (0x00) > >> +#define FMCTL_CE_SEL_M 0xFF > >> +#define FMCTL_CE_SEL(x) (1 << (x)) > >> +#define FMCTL_WP BIT(8) > >> +#define FMCTL_RDY BIT(9) > >> + > >> +#define NFC_FMWAIT (0x04) > >> +#define FLCTL_RST BIT(0) > >> +#define FLCTL_WR (1) /* 0: read, 1: write */ > >> +#define FLCTL_XFER_ST BIT(2) > >> +#define FLCTL_XFER_EN BIT(3) > >> +#define FLCTL_ACORRECT BIT(10) /* Auto correct error bits. */ > >> +#define FLCTL_XFER_READY BIT(20) > >> +#define FLCTL_XFER_SECTOR (22) > >> +#define FLCTL_TOG_FIX BIT(29) > >> + > >> +#define BCHCTL_BANK_M (7 << 5) > >> +#define BCHCTL_BANK (5) > >> + > >> +#define DMA_ST BIT(0) > >> +#define DMA_WR (1) /* 0: write, 1: read */ > >> +#define DMA_EN BIT(2) > >> +#define DMA_AHB_SIZE (3) /* 0: 1, 1: 2, 2: 4 */ > >> +#define DMA_BURST_SIZE (6) /* 0: 1, 3: 4, 5: 8, 7: 16 */ > >> +#define DMA_INC_NUM (9) /* 1 - 16 */ > >> + > >> +#define ECC_ERR_CNT(x, e) ((((x) >> (e).low) & (e).low_mask) |\ > >> + (((x) >> (e).high) & (e).high_mask) << (e).low_bn) > >> +#define INT_DMA BIT(0) > >> +#define NFC_BANK (0x800) > >> +#define NFC_BANK_STEP (0x100) > >> +#define BANK_DATA (0x00) > >> +#define BANK_ADDR (0x04) > >> +#define BANK_CMD (0x08) > >> +#define NFC_SRAM0 (0x1000) > >> +#define NFC_SRAM1 (0x1400) > >> +#define NFC_SRAM_SIZE (0x400) > >> +#define NFC_TIMEOUT (500000) > >> +#define NFC_MAX_OOB_PER_STEP 128 > >> +#define NFC_MIN_OOB_PER_STEP 64 > >> +#define MAX_DATA_SIZE 0xFFFC > >> +#define MAX_ADDRESS_CYC 6 > >> +#define NFC_ECC_MAX_MODES 4 > >> +#define NFC_MAX_NSELS (8) /* Some Socs only have 1 or 2 CSs. */ > >> +#define NFC_SYS_DATA_SIZE (4) /* 4 bytes sys data in oob pre 1024 data.*/ > >> +#define RK_DEFAULT_CLOCK_RATE (150 * 1000 * 1000) /* 150 Mhz */ > >> +#define ACCTIMING(csrw, rwpw, rwcs) ((csrw) << 12 | (rwpw) << 5 | > >> (rwcs)) > >> + > >> +enum nfc_type { > >> + NFC_V6, > >> + NFC_V8, > >> + NFC_V9, > >> +}; > >> + > >> +/** > >> + * struct rk_ecc_cnt_status: represent a ecc status data. > >> + * @err_flag_bit: error flag bit index at register. > >> + * @low: ecc count low bit index at register. > >> + * @low_mask: mask bit. > >> + * @low_bn: ecc count low bit number. > >> + * @high: ecc count high bit index at register. > >> + * @high_mask: mask bit > >> + */ > >> +struct ecc_cnt_status { > >> + u8 err_flag_bit; > >> + u8 low; > >> + u8 low_mask; > >> + u8 low_bn; > >> + u8 high; > >> + u8 high_mask; > >> +}; > >> + > >> +/* > >> + * @type: nfc version > >> + * @ecc_strengths: ecc strengths > >> + * @ecc_cfgs: ecc config values > >> + * @flctl_off: FLCTL register offset > >> + * @bchctl_off: BCHCTL register offset > >> + * @dma_data_buf_off: DMA_DATA_BUF register offset > >> + * @dma_oob_buf_off: DMA_OOB_BUF register offset > >> + * @dma_cfg_off: DMA_CFG register offset > >> + * @dma_st_off: DMA_ST register offset > >> + * @bch_st_off: BCG_ST register offset > >> + * @randmz_off: RANDMZ register offset > >> + * @int_en_off: interrupt enable register offset > >> + * @int_clr_off: interrupt clean register offset > >> + * @int_st_off: interrupt status register offset > >> + * @oob0_off: oob0 register offset > >> + * @oob1_off: oob1 register offset > >> + * @ecc0: represent ECC0 status data > >> + * @ecc1: represent ECC1 status data > >> + */ > >> +struct nfc_cfg { > >> + enum nfc_type type; > >> + u8 ecc_strengths[NFC_ECC_MAX_MODES]; > >> + u32 ecc_cfgs[NFC_ECC_MAX_MODES]; > >> + u32 flctl_off; > >> + u32 bchctl_off; > >> + u32 dma_cfg_off; > >> + u32 dma_data_buf_off; > >> + u32 dma_oob_buf_off; > >> + u32 dma_st_off; > >> + u32 bch_st_off; > >> + u32 randmz_off; > >> + u32 int_en_off; > >> + u32 int_clr_off; > >> + u32 int_st_off; > >> + u32 oob0_off; > >> + u32 oob1_off; > >> + struct ecc_cnt_status ecc0; > >> + struct ecc_cnt_status ecc1; > >> +}; > >> + > >> +struct rk_nfc_nand_chip { > >> + struct list_head node; > >> + struct nand_chip chip; > >> + > >> + u16 spare_per_sector; > >> + u16 oob_buf_per_sector; > >> + u16 boot_blks; > >> + u16 boot_ecc; > >> + u16 metadata_size; > >> + > >> + u8 nsels; > >> + u8 sels[0]; > >> + /* Nothing after this field. */ > >> +}; > >> + > >> +struct rk_nfc { > >> + struct nand_controller controller; > >> + const struct nfc_cfg *cfg; > >> + struct device *dev; > >> + > >> + struct clk *nfc_clk; > >> + struct clk *ahb_clk; > >> + void __iomem *regs; > >> + > >> + u32 selected_bank; > >> + u32 band_offset; > >> + u32 cur_clk; > >> + > >> + struct completion done; > >> + struct list_head chips; > >> + > >> + u8 *buffer; > >> + u8 *page_buf; > >> + u32 *oob_buf; > >> + u32 buffer_size; > >> + u32 oob_buf_size; > >> + > >> + unsigned long assigned_cs; > >> +}; > >> + > >> +static inline struct rk_nfc_nand_chip *rk_nfc_to_rknand(struct nand_chip > >> *chip) > >> +{ > >> + return container_of(chip, struct rk_nfc_nand_chip, chip); > >> +} > >> + > >> +static inline u8 *rk_nfc_buf_to_data_ptr(struct nand_chip *chip, const u8 > >> *p, int i) > >> +{ > >> + return (u8 *)p + i * chip->ecc.size; > >> +} > >> + > >> +static inline u8 *rk_nfc_buf_to_oob_ptr(struct nand_chip *chip, int i) > >> +{ > >> + u8 *poi; > >> + > >> + poi = chip->oob_poi + i * NFC_SYS_DATA_SIZE; > >> + > >> + return poi; > >> +} > >> + > >> +static inline u8 *rk_nfc_buf_to_oob_ecc_ptr(struct nand_chip *chip, int i) > >> +{ > >> + struct rk_nfc_nand_chip *rknand = rk_nfc_to_rknand(chip); > >> + u8 *poi; > >> + > >> + poi = chip->oob_poi + rknand->metadata_size + > >> + chip->ecc.bytes * i; > >> + > >> + return poi; > >> +} > >> + > >> +static inline int rk_nfc_data_len(struct nand_chip *chip) > >> +{ > >> + struct rk_nfc_nand_chip *rknand = rk_nfc_to_rknand(chip); > >> + > >> + return chip->ecc.size + rknand->spare_per_sector; > >> +} > >> + > >> +static inline u8 *rk_nfc_data_ptr(struct nand_chip *chip, int i) > >> +{ > >> + struct rk_nfc *nfc = nand_get_controller_data(chip); > >> + > >> + return nfc->buffer + i * rk_nfc_data_len(chip); > >> +} > >> + > >> +static inline u8 *rk_nfc_oob_ptr(struct nand_chip *chip, int i) > >> +{ > >> + struct rk_nfc *nfc = nand_get_controller_data(chip); > >> + > >> + return nfc->buffer + i * rk_nfc_data_len(chip) + chip->ecc.size; > >> +} > >> + > >> +static void rk_nfc_select_chip(struct nand_chip *chip, int cs) > >> +{ > >> + struct rk_nfc *nfc = nand_get_controller_data(chip); > >> + struct rk_nfc_nand_chip *rknand = rk_nfc_to_rknand(chip); > >> + u32 val; > >> + > >> + if (cs < 0) { > >> + nfc->selected_bank = -1; > >> + /* Deselect the currently selected target. */ > >> + val = readl_relaxed(nfc->regs + NFC_FMCTL); > >> + val &= ~FMCTL_CE_SEL_M; > >> + writel(val, nfc->regs + NFC_FMCTL); > >> + return; > >> + } > >> + > >> + nfc->selected_bank = rknand->sels[cs]; > >> + nfc->band_offset = NFC_BANK + nfc->selected_bank * NFC_BANK_STEP; > >> + > >> + val = readl_relaxed(nfc->regs + NFC_FMCTL); > >> + val &= ~FMCTL_CE_SEL_M; > >> + val |= FMCTL_CE_SEL(nfc->selected_bank); > >> + > >> + writel(val, nfc->regs + NFC_FMCTL); > >> +} > >> + > >> +static inline int rk_nfc_wait_ioready(struct rk_nfc *nfc) > >> +{ > >> + int rc; > >> + u32 val; > >> + > >> + rc = readl_relaxed_poll_timeout(nfc->regs + NFC_FMCTL, val, > >> + val & FMCTL_RDY, 10, NFC_TIMEOUT); > >> + > >> + return rc; > >> +} > >> + > >> +static void rk_nfc_read_buf(struct rk_nfc *nfc, u8 *buf, int len) > >> +{ > >> + int i; > >> + > >> + for (i = 0; i < len; i++) > >> + buf[i] = readb_relaxed(nfc->regs + nfc->band_offset + > >> + BANK_DATA); > >> +} > >> + > >> +static void rk_nfc_write_buf(struct rk_nfc *nfc, const u8 *buf, int len) > >> +{ > >> + int i; > >> + > >> + for (i = 0; i < len; i++) > >> + writeb(buf[i], nfc->regs + nfc->band_offset + BANK_DATA); > >> +} > >> + > >> +static int rk_nfc_cmd(struct nand_chip *chip, > >> + const struct nand_subop *subop) > >> +{ > >> + struct rk_nfc *nfc = nand_get_controller_data(chip); > >> + unsigned int i, j, remaining, start; > >> + int reg_offset = nfc->band_offset; > >> + u8 *inbuf = NULL; > >> + const u8 *outbuf; > >> + u32 cnt = 0; > >> + int ret = 0; > >> + > >> + for (i = 0; i < subop->ninstrs; i++) { > >> + const struct nand_op_instr *instr = &subop->instrs[i]; > >> + > >> + switch (instr->type) { > >> + case NAND_OP_CMD_INSTR: > >> + writeb(instr->ctx.cmd.opcode, > >> + nfc->regs + reg_offset + BANK_CMD); > >> + break; > >> + > >> + case NAND_OP_ADDR_INSTR: > >> + remaining = nand_subop_get_num_addr_cyc(subop, i); > >> + start = nand_subop_get_addr_start_off(subop, i); > >> + > >> + for (j = 0; j < 8 && j + start < remaining; j++) > >> + writeb(instr->ctx.addr.addrs[j + start], > >> + nfc->regs + reg_offset + BANK_ADDR); > >> + break; > >> + > >> + case NAND_OP_DATA_IN_INSTR: > >> + case NAND_OP_DATA_OUT_INSTR: > >> + start = nand_subop_get_data_start_off(subop, i); > >> + cnt = nand_subop_get_data_len(subop, i); > >> + > >> + if (instr->type == NAND_OP_DATA_OUT_INSTR) { > >> + outbuf = instr->ctx.data.buf.out + start; > >> + rk_nfc_write_buf(nfc, outbuf, cnt); > >> + } else { > >> + inbuf = instr->ctx.data.buf.in + start; > >> + rk_nfc_read_buf(nfc, inbuf, cnt); > >> + } > >> + break; > >> + > >> + case NAND_OP_WAITRDY_INSTR: > >> + if (rk_nfc_wait_ioready(nfc) < 0) { > >> + ret = -ETIMEDOUT; > >> + dev_err(nfc->dev, "IO not ready\n"); > >> + } > >> + break; > >> + } > >> + } > >> + > >> + return ret; > >> +} > >> + > >> +static const struct nand_op_parser rk_nfc_op_parser = NAND_OP_PARSER( > >> + NAND_OP_PARSER_PATTERN( > >> + rk_nfc_cmd, > >> + NAND_OP_PARSER_PAT_CMD_ELEM(true), > >> + NAND_OP_PARSER_PAT_ADDR_ELEM(true, MAX_ADDRESS_CYC), > >> + NAND_OP_PARSER_PAT_CMD_ELEM(true), > >> + NAND_OP_PARSER_PAT_WAITRDY_ELEM(true), > >> + NAND_OP_PARSER_PAT_DATA_IN_ELEM(true, MAX_DATA_SIZE)), > >> + NAND_OP_PARSER_PATTERN( > >> + rk_nfc_cmd, > >> + NAND_OP_PARSER_PAT_CMD_ELEM(true), > >> + NAND_OP_PARSER_PAT_ADDR_ELEM(true, MAX_ADDRESS_CYC), > >> + NAND_OP_PARSER_PAT_DATA_OUT_ELEM(true, MAX_DATA_SIZE), > >> + NAND_OP_PARSER_PAT_CMD_ELEM(true), > >> + NAND_OP_PARSER_PAT_WAITRDY_ELEM(true)), > >> +); > >> + > >> +static int rk_nfc_exec_op(struct nand_chip *chip, > >> + const struct nand_operation *op, > >> + bool check_only) > >> +{ > >> + if (!check_only) > >> + rk_nfc_select_chip(chip, op->cs); > >> + > >> + return nand_op_parser_exec_op(chip, &rk_nfc_op_parser, op, > >> + check_only); > >> +} > >> + > >> +static int rk_nfc_setup_data_interface(struct nand_chip *chip, int csline, > >> + const struct nand_interface_config *conf) > > > >Please have a look at the recent changes in the core, this helper > >should be named "setup_interface". > > > >> +{ > >> + struct rk_nfc *nfc = nand_get_controller_data(chip); > >> + const struct nand_sdr_timings *timings; > >> + u32 rate, tc2rw, trwpw, trw2c; > >> + u32 temp; > >> + > >> + if (csline == NAND_DATA_IFACE_CHECK_ONLY) > >> + return 0; > >> + > >> + timings = nand_get_sdr_timings(conf); > >> + if (IS_ERR(timings)) > >> + return -EOPNOTSUPP; > >> + > >> + if (IS_ERR(nfc->nfc_clk)) > >> + rate = clk_get_rate(nfc->ahb_clk); > >> + else > >> + rate = clk_get_rate(nfc->nfc_clk); > >> + > >> + /* Turn clock rate into kHz. */ > >> + rate /= 1000; > >> + > >> + tc2rw = 1; > >> + trw2c = 1; > >> + > >> + trwpw = max(timings->tWC_min, timings->tRC_min) / 1000; > >> + trwpw = DIV_ROUND_UP(trwpw * rate, 1000000); > >> + > >> + temp = timings->tREA_max / 1000; > >> + temp = DIV_ROUND_UP(temp * rate, 1000000); > >> + > >> + if (trwpw < temp) > >> + trwpw = temp; > >> + > >> + /* > >> + * ACCON: access timing control register > >> + * ------------------------------------- > >> + * 31:18: reserved > >> + * 17:12: csrw, clock cycles from the falling edge of CSn to the > >> + * falling edge of RDn or WRn > >> + * 11:11: reserved > >> + * 10:05: rwpw, the width of RDn or WRn in processor clock cycles > >> + * 04:00: rwcs, clock cycles from the rising edge of RDn or WRn to the > >> + * rising edge of CSn > >> + */ > >> + temp = ACCTIMING(tc2rw, trwpw, trw2c); > >> + writel(temp, nfc->regs + NFC_FMWAIT); > > > >You should save the chip's timing configuration instead of writing it > >here, and setting the register value during chip selection. This way > >you may handle several chips with different timing > >constraints/configurations. > > > >> + > >> + return 0; > >> +} > >> + > >> +static int rk_nfc_hw_ecc_setup(struct nand_chip *chip, > >> + struct nand_ecc_ctrl *ecc, > >> + uint32_t strength) > >> +{ > >> + struct rk_nfc *nfc = nand_get_controller_data(chip); > >> + u32 reg, i; > >> + > >> + for (i = 0; i < NFC_ECC_MAX_MODES; i++) { > >> + if (ecc->strength == nfc->cfg->ecc_strengths[i]) { > >> + reg = nfc->cfg->ecc_cfgs[i]; > >> + break; > >> + } > >> + } > >> + > >> + if (i >= NFC_ECC_MAX_MODES) > >> + return -EINVAL; > >> + > >> + writel(reg, nfc->regs + nfc->cfg->bchctl_off); > > > >Same here, if you handle different chips, they may use different ECC > >configurations, this should be handled. > > > >> + > >> + return 0; > >> +} > >> + > >> +static void rk_nfc_xfer_start(struct rk_nfc *nfc, u8 rw, u8 n_KB, > >> + dma_addr_t dma_data, dma_addr_t dma_oob) > >> +{ > >> + u32 dma_reg, fl_reg, bch_reg; > >> + > >> + dma_reg = DMA_ST | ((!rw) << DMA_WR) | DMA_EN | (2 << DMA_AHB_SIZE) | > >> + (7 << DMA_BURST_SIZE) | (16 << DMA_INC_NUM); > >> + > >> + fl_reg = (rw << FLCTL_WR) | FLCTL_XFER_EN | FLCTL_ACORRECT | > >> + (n_KB << FLCTL_XFER_SECTOR) | FLCTL_TOG_FIX; > >> + > >> + if (nfc->cfg->type == NFC_V6 || nfc->cfg->type == NFC_V8) { > >> + bch_reg = readl_relaxed(nfc->regs + nfc->cfg->bchctl_off); > >> + bch_reg = (bch_reg & (~BCHCTL_BANK_M)) | > >> + (nfc->selected_bank << BCHCTL_BANK); > >> + writel(bch_reg, nfc->regs + nfc->cfg->bchctl_off); > >> + } > >> + > >> + writel(dma_reg, nfc->regs + nfc->cfg->dma_cfg_off); > >> + writel((u32)dma_data, nfc->regs + nfc->cfg->dma_data_buf_off); > >> + writel((u32)dma_oob, nfc->regs + nfc->cfg->dma_oob_buf_off); > >> + writel(fl_reg, nfc->regs + nfc->cfg->flctl_off); > >> + fl_reg |= FLCTL_XFER_ST; > >> + writel(fl_reg, nfc->regs + nfc->cfg->flctl_off); > >> +} > >> + > >> +static int rk_nfc_wait_for_xfer_done(struct rk_nfc *nfc) > >> +{ > >> + void __iomem *ptr; > >> + int ret = 0; > >> + u32 reg; > >> + > >> + ptr = nfc->regs + nfc->cfg->flctl_off; > >> + > >> + ret = readl_relaxed_poll_timeout(ptr, reg, > >> + reg & FLCTL_XFER_READY, > >> + 10, NFC_TIMEOUT); > >> + > >> + return ret; > >> +} > >> + > >> +static int rk_nfc_write_page_raw(struct nand_chip *chip, const u8 *buf, > >> + int oob_on, int page) > >> +{ > >> + struct mtd_info *mtd = nand_to_mtd(chip); > >> + struct rk_nfc *nfc = nand_get_controller_data(chip); > >> + struct nand_ecc_ctrl *ecc = &chip->ecc; > >> + int ret = 0; > >> + u32 i; > >> + > >> + if (!buf) > >> + memset(nfc->buffer, 0xff, mtd->writesize + mtd->oobsize); > >> + > >> + for (i = 0; i < ecc->steps; i++) { > >> + /* Copy data to nfc buffer. */ > >> + if (buf) > >> + memcpy(rk_nfc_data_ptr(chip, i), > >> + rk_nfc_buf_to_data_ptr(chip, buf, i), > >> + ecc->size); > >> + /* > >> + * The first four bytes of OOB are reserved for the > >> + * boot ROM. In some debugging cases, such as with a > >> + * read, erase and write back test these 4 bytes stored > >> + * in OOB also need to be written back. > >> + */ > > > >The controller driver should not arbitrate this. If you don't want to > >expose these bytes, they should not appear "free" in the OOB layout, > >but a raw access *must* but able to address the entire page/oob. > > I don't have a solution to fix it. > The function nand_block_bad detect bad block like it: > bad = chip->oob_poi[chip->badblockpos]; //chip->badblockpos = 0 for large > page NAND Flash. > So chip->oob_poi[0] is bad masker. > > The oob data layout for rk nfc is: > PA0 PA1 PA2 PA3 | BBM OOB1 OOB2 OOB3 | ... > or > 0xFF 0xFF 0xFF 0xFF | BBM OOB1 OOB2 OOB3 | ... > > The code here just to swap the first 4 bytes with the last 4 bytes and > without droped any data. > and the chip->oob_poi data layout: > BBM OOB1 OOB2 OOB3|......| PA0 PA1 PA2 PA3 > > The OOB layout free already reserved this 4 bytes: > oob_region->offset = NFC_SYS_DATA_SIZE + 2; > > >> + if (!i) > >> + memcpy(rk_nfc_oob_ptr(chip, i), > >> + rk_nfc_buf_to_oob_ptr(chip, ecc->steps - 1), > >> + NFC_SYS_DATA_SIZE); > >> + else > >> + memcpy(rk_nfc_oob_ptr(chip, i), > >> + rk_nfc_buf_to_oob_ptr(chip, i - 1), > >> + NFC_SYS_DATA_SIZE); > >> + /* Copy ECC data to the NFC buffer. */ > >> + memcpy(rk_nfc_oob_ptr(chip, i) + NFC_SYS_DATA_SIZE, > >> + rk_nfc_buf_to_oob_ecc_ptr(chip, i), > >> + ecc->bytes); > >> + } > >> + > >> + nand_prog_page_begin_op(chip, page, 0, NULL, 0); > >> + rk_nfc_write_buf(nfc, buf, mtd->writesize + mtd->oobsize); > >> + ret = nand_prog_page_end_op(chip); > >> + > >> + /* > >> + * Deselect the currently selected target after the ops is done > >> + * to reduce the power consumption. > >> + */ > >> + rk_nfc_select_chip(chip, -1); > >> + > >> + return ret; > >> +} > >> + > >> +static int rk_nfc_write_oob(struct nand_chip *chip, int page) > >> +{ > >> + return rk_nfc_write_page_raw(chip, NULL, 1, page); > > > >Not sure this is relevant. You should not do that, I guess the core > >will automatically take care of it. > > > >> +} > >> + > >> +static int rk_nfc_write_page_hwecc(struct nand_chip *chip, const u8 *buf, > >> + int oob_on, int page) > >> +{ > >> + struct mtd_info *mtd = nand_to_mtd(chip); > >> + struct rk_nfc *nfc = nand_get_controller_data(chip); > >> + struct rk_nfc_nand_chip *rknand = rk_nfc_to_rknand(chip); > >> + struct nand_ecc_ctrl *ecc = &chip->ecc; > >> + int oob_step = (ecc->bytes > 60) ? NFC_MAX_OOB_PER_STEP : > >> + NFC_MIN_OOB_PER_STEP; > >> + int pages_per_blk = mtd->erasesize / mtd->writesize; > >> + int ret = 0, i, boot_rom_mode = 0; > >> + dma_addr_t dma_data, dma_oob; > >> + u32 reg; > >> + u8 *oob; > >> + > >> + nand_prog_page_begin_op(chip, page, 0, NULL, 0); > >> + > >> + memcpy(nfc->page_buf, buf, mtd->writesize); > >> + > >> + /* > >> + * The first blocks (4, 8 or 16 depending on the device) are used > >> + * by the boot ROM and the first 32 bits of OOB need to link to > >> + * the next page address in the same block. We can't directly copy > >> + * OOB data from the MTD framework, because this page address > >> + * conflicts for example with the bad block marker (BBM), > >> + * so we shift all OOB data including the BBM with 4 byte positions. > >> + * As a consequence the OOB size available to the MTD framework is > >> + * also reduced with 4 bytes. > >> + * > >> + * PA0 PA1 PA2 PA3 | BBM OOB1 OOB2 OOB3 | ... > >> + * > >> + * If a NAND is not a boot medium or the page is not a boot block, > >> + * the first 4 bytes are left untouched by writing 0xFF to them. > >> + * > >> + * 0xFF 0xFF 0xFF 0xFF | BBM OOB1 OOB2 OOB3 | ... > >> + * > >> + * Configure the ECC algorithm supported by the boot ROM. > >> + */ > >> + if ((page < pages_per_blk * rknand->boot_blks) && > >> + (chip->options & NAND_IS_BOOT_MEDIUM)) { > >> + boot_rom_mode = 1; > >> + if (rknand->boot_ecc != ecc->strength) > >> + rk_nfc_hw_ecc_setup(chip, ecc, > >> + rknand->boot_ecc); > >> + } > >> + > >> + for (i = 0; i < ecc->steps; i++) { > >> + if (!i) { > >> + reg = 0xFFFFFFFF; > >> + } else { > >> + oob = chip->oob_poi + (i - 1) * NFC_SYS_DATA_SIZE; > >> + reg = oob[0] | oob[1] << 8 | oob[2] << 16 | > >> + oob[3] << 24; > >> + } > >> + if (!i && boot_rom_mode) > >> + reg = (page & (pages_per_blk - 1)) * 4; > >> + > >> + if (nfc->cfg->type == NFC_V9) > >> + nfc->oob_buf[i] = reg; > >> + else > >> + nfc->oob_buf[i * (oob_step / 4)] = reg; > >> + } > >> + > >> + dma_data = dma_map_single(nfc->dev, (void *)nfc->page_buf, > >> + mtd->writesize, DMA_TO_DEVICE); > >> + dma_oob = dma_map_single(nfc->dev, nfc->oob_buf, > >> + ecc->steps * oob_step, > >> + DMA_TO_DEVICE); > >> + > >> + reinit_completion(&nfc->done); > >> + writel(INT_DMA, nfc->regs + nfc->cfg->int_en_off); > >> + > >> + rk_nfc_xfer_start(nfc, NFC_WRITE, ecc->steps, dma_data, > >> + dma_oob); > >> + ret = wait_for_completion_timeout(&nfc->done, > >> + msecs_to_jiffies(100)); > >> + if (!ret) > >> + dev_warn(nfc->dev, "write: wait dma done timeout.\n"); > >> + /* > >> + * Whether the DMA transfer is completed or not. The driver > >> + * needs to check the NFC`s status register to see if the data > >> + * transfer was completed. > >> + */ > >> + ret = rk_nfc_wait_for_xfer_done(nfc); > >> + > >> + dma_unmap_single(nfc->dev, dma_data, mtd->writesize, > >> + DMA_TO_DEVICE); > >> + dma_unmap_single(nfc->dev, dma_oob, ecc->steps * oob_step, > >> + DMA_TO_DEVICE); > >> + > >> + if (boot_rom_mode && rknand->boot_ecc != ecc->strength) > >> + rk_nfc_hw_ecc_setup(chip, ecc, ecc->strength); > >> + > >> + if (ret) { > >> + ret = -EIO; > >> + dev_err(nfc->dev, > >> + "write: wait transfer done timeout.\n"); > >> + } > >> + > >> + if (ret) > >> + return ret; > >> + > >> + ret = nand_prog_page_end_op(chip); > >> + > >> + /* > >> + * Deselect the currently selected target after the ops is done > >> + * to reduce the power consumption. > >> + */ > > > >If you force this deselection, your should probably do it even in case > >of error? > > > >> + rk_nfc_select_chip(chip, -1); > >> + > >> + return ret; > >> +} > >> + > >> +static int rk_nfc_read_page_raw(struct nand_chip *chip, u8 *buf, int > >> oob_on, > >> + int page) > >> +{ > >> + struct mtd_info *mtd = nand_to_mtd(chip); > >> + struct rk_nfc *nfc = nand_get_controller_data(chip); > >> + struct nand_ecc_ctrl *ecc = &chip->ecc; > >> + int i; > >> + > >> + nand_read_page_op(chip, page, 0, NULL, 0); > >> + rk_nfc_read_buf(nfc, nfc->buffer, mtd->writesize + mtd->oobsize); > >> + > >> + /* > >> + * Deselect the currently selected target after the ops is done > >> + * to reduce the power consumption. > >> + */ > >> + rk_nfc_select_chip(chip, -1); > >> + > >> + for (i = 0; i < ecc->steps; i++) { > >> + /* > >> + * The first four bytes of OOB are reserved for the > >> + * boot ROM. In some debugging cases, such as with a read, > >> + * erase and write back test, these 4 bytes also must be > >> + * saved somewhere, otherwise this information will be > >> + * lost during a write back. > > > >Ditto > > > >> + */ > >> + if (!i) > >> + memcpy(rk_nfc_buf_to_oob_ptr(chip, ecc->steps - 1), > >> + rk_nfc_oob_ptr(chip, i), > >> + NFC_SYS_DATA_SIZE); > >> + else > >> + memcpy(rk_nfc_buf_to_oob_ptr(chip, i - 1), > >> + rk_nfc_oob_ptr(chip, i), > >> + NFC_SYS_DATA_SIZE); > >> + /* Copy ECC data from the NFC buffer. */ > >> + memcpy(rk_nfc_buf_to_oob_ecc_ptr(chip, i), > >> + rk_nfc_oob_ptr(chip, i) + NFC_SYS_DATA_SIZE, > >> + ecc->bytes); > >> + /* Copy data from the NFC buffer. */ > >> + if (buf) > >> + memcpy(rk_nfc_buf_to_data_ptr(chip, buf, i), > >> + rk_nfc_data_ptr(chip, i), > >> + ecc->size); > >> + } > >> + > >> + return 0; > >> +} > >> + > >> +static int rk_nfc_read_oob(struct nand_chip *chip, int page) > >> +{ > >> + return rk_nfc_read_page_raw(chip, NULL, 1, page); > > > >Ditto > > > >> +} > >> + > >> +static int rk_nfc_read_page_hwecc(struct nand_chip *chip, u8 *buf, int > >> oob_on, > >> + int page) > >> +{ > >> + struct mtd_info *mtd = nand_to_mtd(chip); > >> + struct rk_nfc *nfc = nand_get_controller_data(chip); > >> + struct rk_nfc_nand_chip *rknand = rk_nfc_to_rknand(chip); > >> + struct nand_ecc_ctrl *ecc = &chip->ecc; > >> + int oob_step = (ecc->bytes > 60) ? NFC_MAX_OOB_PER_STEP : > >> + NFC_MIN_OOB_PER_STEP; > >> + int pages_per_blk = mtd->erasesize / mtd->writesize; > >> + dma_addr_t dma_data, dma_oob; > >> + int ret = 0, i, boot_rom_mode = 0; > >> + int bitflips = 0, bch_st; > >> + u8 *oob; > >> + u32 tmp; > >> + > >> + nand_read_page_op(chip, page, 0, NULL, 0); > >> + > >> + dma_data = dma_map_single(nfc->dev, nfc->page_buf, > >> + mtd->writesize, > >> + DMA_FROM_DEVICE); > >> + dma_oob = dma_map_single(nfc->dev, nfc->oob_buf, > >> + ecc->steps * oob_step, > >> + DMA_FROM_DEVICE); > >> + > >> + /* > >> + * The first blocks (4, 8 or 16 depending on the device) > >> + * are used by the boot ROM. > >> + * Configure the ECC algorithm supported by the boot ROM. > >> + */ > >> + if ((page < pages_per_blk * rknand->boot_blks) && > >> + (chip->options & NAND_IS_BOOT_MEDIUM)) { > >> + boot_rom_mode = 1; > >> + if (rknand->boot_ecc != ecc->strength) > >> + rk_nfc_hw_ecc_setup(chip, ecc, > >> + rknand->boot_ecc); > >> + } > >> + > >> + reinit_completion(&nfc->done); > >> + writel(INT_DMA, nfc->regs + nfc->cfg->int_en_off); > >> + rk_nfc_xfer_start(nfc, NFC_READ, ecc->steps, dma_data, > >> + dma_oob); > >> + ret = wait_for_completion_timeout(&nfc->done, > >> + msecs_to_jiffies(100)); > >> + if (!ret) > >> + dev_warn(nfc->dev, "read: wait dma done timeout.\n"); > >> + /* > >> + * Whether the DMA transfer is completed or not. The driver > >> + * needs to check the NFC`s status register to see if the data > >> + * transfer was completed. > >> + */ > >> + ret = rk_nfc_wait_for_xfer_done(nfc); > >> + dma_unmap_single(nfc->dev, dma_data, mtd->writesize, > >> + DMA_FROM_DEVICE); > >> + dma_unmap_single(nfc->dev, dma_oob, ecc->steps * oob_step, > >> + DMA_FROM_DEVICE); > >> + > >> + if (ret) { > >> + bitflips = -EIO; > >> + dev_err(nfc->dev, > >> + "read: wait transfer done timeout.\n"); > >> + goto out; > >> + } > >> + > >> + for (i = 1; i < ecc->steps; i++) { > >> + oob = chip->oob_poi + (i - 1) * NFC_SYS_DATA_SIZE; > >> + if (nfc->cfg->type == NFC_V9) > >> + tmp = nfc->oob_buf[i]; > >> + else > >> + tmp = nfc->oob_buf[i * (oob_step / 4)]; > >> + *oob++ = (u8)tmp; > >> + *oob++ = (u8)(tmp >> 8); > >> + *oob++ = (u8)(tmp >> 16); > >> + *oob++ = (u8)(tmp >> 24); > >> + } > >> + > >> + for (i = 0; i < (ecc->steps / 2); i++) { > >> + bch_st = readl_relaxed(nfc->regs + > >> + nfc->cfg->bch_st_off + i * 4); > >> + if (bch_st & BIT(nfc->cfg->ecc0.err_flag_bit) || > >> + bch_st & BIT(nfc->cfg->ecc1.err_flag_bit)) { > >> + mtd->ecc_stats.failed++; > >> + bitflips = 0; > >> + } else { > >> + ret = ECC_ERR_CNT(bch_st, nfc->cfg->ecc0); > >> + mtd->ecc_stats.corrected += ret; > >> + bitflips = max_t(u32, bitflips, ret); > >> + > >> + ret = ECC_ERR_CNT(bch_st, nfc->cfg->ecc1); > >> + mtd->ecc_stats.corrected += ret; > >> + bitflips = max_t(u32, bitflips, ret); > >> + } > >> + } > >> +out: > >> + memcpy(buf, nfc->page_buf, mtd->writesize); > >> + > >> + if (boot_rom_mode && rknand->boot_ecc != ecc->strength) > >> + rk_nfc_hw_ecc_setup(chip, ecc, ecc->strength); > >> + > >> + if (bitflips > ecc->strength) > >> + dev_err(nfc->dev, "read page: %x ecc error!\n", page); > >> + > >> + /* > >> + * Deselect the currently selected target after the ops is done > >> + * to reduce the power consumption. > >> + */ > >> + rk_nfc_select_chip(chip, -1); > >> + > >> + return bitflips; > >> +} > >> + > >> +static inline void rk_nfc_hw_init(struct rk_nfc *nfc) > >> +{ > >> + /* Disable flash wp. */ > >> + writel(FMCTL_WP, nfc->regs + NFC_FMCTL); > >> + /* Config default timing 40ns at 150 Mhz nfc clock. */ > >> + writel(0x1081, nfc->regs + NFC_FMWAIT); > >> + /* Disable randomizer and DMA. */ > >> + writel(0, nfc->regs + nfc->cfg->randmz_off); > >> + writel(0, nfc->regs + nfc->cfg->dma_cfg_off); > >> + writel(FLCTL_RST, nfc->regs + nfc->cfg->flctl_off); > >> +} > >> + > >> +static irqreturn_t rk_nfc_irq(int irq, void *id) > >> +{ > >> + struct rk_nfc *nfc = id; > >> + u32 sta, ien; > >> + > >> + sta = readl_relaxed(nfc->regs + nfc->cfg->int_st_off); > >> + ien = readl_relaxed(nfc->regs + nfc->cfg->int_en_off); > >> + > >> + if (!(sta & ien)) > >> + return IRQ_NONE; > >> + > >> + writel(sta, nfc->regs + nfc->cfg->int_clr_off); > >> + writel(~sta & ien, nfc->regs + nfc->cfg->int_en_off); > >> + > >> + complete(&nfc->done); > >> + > >> + return IRQ_HANDLED; > >> +} > >> + > >> +static int rk_nfc_enable_clks(struct device *dev, struct rk_nfc *nfc) > >> +{ > >> + int ret; > >> + > >> + if (!IS_ERR(nfc->nfc_clk)) { > >> + ret = clk_prepare_enable(nfc->nfc_clk); > >> + if (ret) { > >> + dev_err(dev, "failed to enable nfc clk\n"); > >> + return ret; > >> + } > >> + } > >> + > >> + ret = clk_prepare_enable(nfc->ahb_clk); > >> + if (ret) { > >> + dev_err(dev, "failed to enable ahb clk\n"); > >> + if (!IS_ERR(nfc->nfc_clk)) > >> + clk_disable_unprepare(nfc->nfc_clk); > >> + return ret; > >> + } > >> + > >> + return 0; > >> +} > >> + > >> +static void rk_nfc_disable_clks(struct rk_nfc *nfc) > >> +{ > >> + if (!IS_ERR(nfc->nfc_clk)) > >> + clk_disable_unprepare(nfc->nfc_clk); > >> + clk_disable_unprepare(nfc->ahb_clk); > >> +} > >> + > >> +static int rk_nfc_ooblayout_free(struct mtd_info *mtd, int section, > >> + struct mtd_oob_region *oob_region) > >> +{ > >> + struct nand_chip *chip = mtd_to_nand(mtd); > >> + struct rk_nfc_nand_chip *rknand = rk_nfc_to_rknand(chip); > >> + > >> + if (section) > >> + return -ERANGE; > >> + > >> + /* > >> + * The beginning of the OOB area stores the reserved data for the NFC, > >> + * the size of the reserved data is NFC_SYS_DATA_SIZE bytes. > >> + */ > >> + oob_region->length = rknand->metadata_size - NFC_SYS_DATA_SIZE - 2; > >> + oob_region->offset = NFC_SYS_DATA_SIZE + 2; > >> + > >> + return 0; > >> +} > >> + > >> +static int rk_nfc_ooblayout_ecc(struct mtd_info *mtd, int section, > >> + struct mtd_oob_region *oob_region) > >> +{ > >> + struct nand_chip *chip = mtd_to_nand(mtd); > >> + struct rk_nfc_nand_chip *rknand = rk_nfc_to_rknand(chip); > >> + > >> + if (section) > >> + return -ERANGE; > >> + > >> + oob_region->length = mtd->oobsize - rknand->metadata_size; > >> + oob_region->offset = rknand->metadata_size; > >> + > >> + return 0; > >> +} > >> + > >> +static const struct mtd_ooblayout_ops rk_nfc_ooblayout_ops = { > >> + .free = rk_nfc_ooblayout_free, > >> + .ecc = rk_nfc_ooblayout_ecc, > >> +}; > >> + > >> +static int rk_nfc_ecc_init(struct device *dev, struct mtd_info *mtd) > >> +{ > >> + struct nand_chip *chip = mtd_to_nand(mtd); > >> + struct rk_nfc *nfc = nand_get_controller_data(chip); > >> + struct nand_ecc_ctrl *ecc = &chip->ecc; > >> + const u8 *strengths = nfc->cfg->ecc_strengths; > >> + u8 max_strength, nfc_max_strength; > >> + int i; > >> + > >> + nfc_max_strength = nfc->cfg->ecc_strengths[0]; > >> + /* If optional dt settings not present. */ > >> + if (!ecc->size || !ecc->strength || > >> + ecc->strength > nfc_max_strength) { > >> + chip->ecc.size = 1024; > >> + ecc->steps = mtd->writesize / ecc->size; > >> + > >> + /* > >> + * HW ECC always requests the number of ECC bytes per 1024 byte > >> + * blocks. The first 4 OOB bytes are reserved for sys data. > >> + */ > >> + max_strength = ((mtd->oobsize / ecc->steps) - 4) * 8 / > >> + fls(8 * 1024); > >> + if (max_strength > nfc_max_strength) > >> + max_strength = nfc_max_strength; > >> + > >> + for (i = 0; i < 4; i++) { > >> + if (max_strength >= strengths[i]) > >> + break; > >> + } > >> + > >> + if (i >= 4) { > >> + dev_err(nfc->dev, "Unsupported ECC strength\n"); > >> + return -EOPNOTSUPP; > >> + } > >> + > >> + ecc->strength = strengths[i]; > >> + } > >> + ecc->steps = mtd->writesize / ecc->size; > >> + ecc->bytes = DIV_ROUND_UP(ecc->strength * fls(8 * 1024), 8); > > > >Here you assume 1024 ECC step size, this is wrong. Either the > >controller only supports 1024 bytes or you officially state somewhere > >that you don't support more ECC step sizes yet. > > > >> + /* HW ECC always work with even numbers of ECC bytes. */ > >> + ecc->bytes = ALIGN(ecc->bytes, 2); > > > >Shouldn't you ensure the number of bytes is rounded up ? > > The V6 and V9 controller supports DDR mode, so ECC bytes need to be aligned > to an even number if enable DDR mode. > This drivers no support ddr mode now，I will drop this code. > I think your approach is fine, I just misunderstood it because of the comment. Maybe you could: - Create a helper for that - Correct the comment to clearly explain what you do (your explanation here is very clear to me) - Include the comment in the helper, not in each function - Call the helper in every function accessing this area unless the block is reserved for the bootrom? Thanks, Miquèl
