Hi, devnull+keguang.zhang.gmail.com@xxxxxxxxxx wrote on Tue, 30 Apr 2024 19:11:12 +0800: > From: Keguang Zhang <keguang.zhang@xxxxxxxxx> > > This patch adds NAND Controller driver for Loongson-1 SoCs. > > Signed-off-by: Keguang Zhang <keguang.zhang@xxxxxxxxx> > --- > Changes in v7: > - Rename the dependency to LOONGSON1_APB_DMA > > Changes in v6: > - Amend Kconfig > - Add DT support > - Use DT data instead of platform data > - Remove MAX_ID_SIZE > - Remove case NAND_OP_CMD_INSTR in ls1x_nand_set_controller() > - Move ECC configuration to ls1x_nand_attach_chip() > - Rename variable "nand" to "ls1x" > - Rename variable "nc" to "nfc" > - Some minor fixes > - Link to v5: https://lore.kernel.org/all/20210520224213.7907-1-keguang.zhang@xxxxxxxxx > > Changes in v5: > - Update the driver to fit the raw NAND framework. > - Implement exec_op() instead of legacy cmdfunc(). > - Use dma_request_chan() instead of dma_request_channel(). > - Some minor fixes and cleanups. > > Changes in v4: > - Retrieve the controller from nand_hw_control. > > Changes in v3: > - Replace __raw_readl/__raw_writel with readl/writel. > - Split ls1x_nand into two structures: > ls1x_nand_chip and ls1x_nand_controller. > > Changes in v2: > - Modify the dependency in Kconfig due to the changes of DMA module. > --- > drivers/mtd/nand/raw/Kconfig | 7 + > drivers/mtd/nand/raw/Makefile | 1 + > drivers/mtd/nand/raw/loongson1_nand.c | 748 ++++++++++++++++++++++++++++++++++ > 3 files changed, 756 insertions(+) > > diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig > index cbf8ae85e1ae..822bb7a2cea9 100644 > --- a/drivers/mtd/nand/raw/Kconfig > +++ b/drivers/mtd/nand/raw/Kconfig > @@ -449,6 +449,13 @@ config MTD_NAND_RENESAS > Enables support for the NAND controller found on Renesas R-Car > Gen3 and RZ/N1 SoC families. > > +config MTD_NAND_LOONGSON1 > + tristate "Loongson1 NAND controller" > + depends on LOONGSON1_APB_DMA || COMPILE_TEST > + select REGMAP_MMIO > + help > + Enables support for NAND controller on Loongson1 SoCs. > + > comment "Misc" > > config MTD_SM_COMMON > diff --git a/drivers/mtd/nand/raw/Makefile b/drivers/mtd/nand/raw/Makefile > index 25120a4afada..b3c65cab819c 100644 > --- a/drivers/mtd/nand/raw/Makefile > +++ b/drivers/mtd/nand/raw/Makefile > @@ -57,6 +57,7 @@ obj-$(CONFIG_MTD_NAND_INTEL_LGM) += intel-nand-controller.o > obj-$(CONFIG_MTD_NAND_ROCKCHIP) += rockchip-nand-controller.o > obj-$(CONFIG_MTD_NAND_PL35X) += pl35x-nand-controller.o > obj-$(CONFIG_MTD_NAND_RENESAS) += renesas-nand-controller.o > +obj-$(CONFIG_MTD_NAND_LOONGSON1) += loongson1_nand.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/loongson1_nand.c b/drivers/mtd/nand/raw/loongson1_nand.c > new file mode 100644 > index 000000000000..d0f66a81ba0b > --- /dev/null > +++ b/drivers/mtd/nand/raw/loongson1_nand.c > @@ -0,0 +1,748 @@ > +// SPDX-License-Identifier: GPL-2.0-or-later > +/* > + * NAND Controller Driver for Loongson-1 SoC > + * > + * Copyright (C) 2015-2024 Keguang Zhang <keguang.zhang@xxxxxxxxx> > + */ > + > +#include <linux/kernel.h> > +#include <linux/module.h> > +#include <linux/dmaengine.h> > +#include <linux/dma-mapping.h> > +#include <linux/iopoll.h> > +#include <linux/mtd/mtd.h> > +#include <linux/mtd/rawnand.h> > +#include <linux/of.h> > +#include <linux/platform_device.h> > +#include <linux/regmap.h> > +#include <linux/sizes.h> > + > +/* Loongson-1 NAND Controller Registers */ > +#define NAND_CMD 0x0 > +#define NAND_ADDR1 0x4 > +#define NAND_ADDR2 0x8 > +#define NAND_TIMING 0xc > +#define NAND_IDL 0x10 > +#define NAND_IDH_STATUS 0x14 > +#define NAND_PARAM 0x18 > +#define NAND_OP_NUM 0x1c > +#define MAX_DUMP_REGS 0x20 > + > +#define NAND_DMA_ADDR 0x40 > + > +/* NAND Command Register Bits */ > +#define OP_DONE BIT(10) > +#define OP_SPARE BIT(9) > +#define OP_MAIN BIT(8) > +#define CMD_STATUS BIT(7) > +#define CMD_RESET BIT(6) > +#define CMD_READID BIT(5) > +#define BLOCKS_ERASE BIT(4) > +#define CMD_ERASE BIT(3) > +#define CMD_WRITE BIT(2) > +#define CMD_READ BIT(1) > +#define CMD_VALID BIT(0) Please add a common suffix to all your definitions and functions (LSN_, LSN1_, LOONGSON_, whatever) > + > +#define MAX_ADDR_CYC 5U > + > +#define WAIT_CYCLE_MASK GENMASK(7, 0) > +#define HOLD_CYCLE_MASK GENMASK(15, 8) > +#define CELL_SIZE_MASK GENMASK(11, 8) > + > +#define BITS_PER_WORD (4 * BITS_PER_BYTE) > + > +/* macros for registers read/write */ > +#define nand_readl(nfc, off) \ > + readl((nfc)->reg_base + (off)) > + > +#define nand_writel(nfc, off, val) \ > + writel((val), (nfc)->reg_base + (off)) > + > +struct ls1x_nfc_data { > + unsigned int status_field; > + unsigned int op_scope_field; > + unsigned int hold_cycle; > + unsigned int wait_cycle; > + void (*parse_address)(struct nand_chip *chip, const u8 *addrs, > + unsigned int naddrs, int cmd); > +}; > + > +struct ls1x_nfc { > + void __iomem *reg_base; > + struct regmap *regmap; > + const struct ls1x_nfc_data *data; > + __le32 addr1_reg; > + __le32 addr2_reg; > + > + char *buf; > + unsigned int len; > + unsigned int rdy_timeout; > + > + /* DMA Engine stuff */ > + struct dma_chan *dma_chan; > + dma_cookie_t dma_cookie; > + struct completion dma_complete; > +}; > + > +struct ls1x_nand { > + struct device *dev; > + struct nand_chip chip; > + struct nand_controller controller; > + struct ls1x_nfc nfc; > +}; > + > +static const struct regmap_config ls1x_nand_regmap_config = { > + .reg_bits = 32, > + .val_bits = 32, > + .reg_stride = 4, > +}; > + > +static inline void ls1b_nand_parse_address(struct nand_chip *chip, > + const u8 *addrs, > + unsigned int naddrs, int cmd) > +{ > + struct ls1x_nand *ls1x = nand_get_controller_data(chip); > + struct ls1x_nfc *nfc = &ls1x->nfc; > + unsigned int page_shift = chip->page_shift + 1; > + int i; > + > + nfc->addr1_reg = 0; > + nfc->addr2_reg = 0; > + > + if (cmd == CMD_ERASE) { > + page_shift = chip->page_shift; > + > + for (i = 0; i < min(MAX_ADDR_CYC - 2, naddrs); i++) > + nfc->addr1_reg |= > + (u32)addrs[i] << (page_shift + BITS_PER_BYTE * i); > + if (i == MAX_ADDR_CYC - 2) > + nfc->addr2_reg |= > + (u32)addrs[i] >> (BITS_PER_WORD - page_shift - > + BITS_PER_BYTE * (i - 1)); > + > + return; > + } I don't see the point in having this if, can you try to make it a single generic logic? Same below. > + > + for (i = 0; i < min(2U, naddrs); i++) > + nfc->addr1_reg |= (u32)addrs[i] << BITS_PER_BYTE * i; > + for (i = 2; i < min(MAX_ADDR_CYC, naddrs); i++) > + nfc->addr1_reg |= > + (u32)addrs[i] << (page_shift + BITS_PER_BYTE * (i - 2)); > + if (i == MAX_ADDR_CYC) > + nfc->addr2_reg |= > + (u32)addrs[i] >> (BITS_PER_WORD - page_shift - > + BITS_PER_BYTE * (i - 1)); > +} > + > +static inline void ls1c_nand_parse_address(struct nand_chip *chip, > + const u8 *addrs, > + unsigned int naddrs, int cmd) > +{ > + struct ls1x_nand *ls1x = nand_get_controller_data(chip); > + struct ls1x_nfc *nfc = &ls1x->nfc; > + int i; > + > + nfc->addr1_reg = 0; > + nfc->addr2_reg = 0; > + > + if (cmd == CMD_ERASE) { > + for (i = 0; i < min(MAX_ADDR_CYC, naddrs); i++) > + nfc->addr2_reg |= (u32)addrs[i] << BITS_PER_BYTE * i; > + > + return; > + } > + > + for (i = 0; i < min(MAX_ADDR_CYC, naddrs); i++) { > + if (i < 2) > + nfc->addr1_reg |= (u32)addrs[i] << BITS_PER_BYTE * i; > + else > + nfc->addr2_reg |= > + (u32)addrs[i] << BITS_PER_BYTE * (i - 2); > + } > +} > + > +static int ls1x_nand_set_controller(struct nand_chip *chip, The function name is misleading > + const struct nand_subop *subop, int cmd) > +{ > + struct ls1x_nand *ls1x = nand_get_controller_data(chip); > + struct ls1x_nfc *nfc = &ls1x->nfc; > + unsigned int op_id; > + > + nfc->buf = NULL; > + nfc->len = 0; > + nfc->rdy_timeout = 0; > + > + for (op_id = 0; op_id < subop->ninstrs; op_id++) { > + const struct nand_op_instr *instr = &subop->instrs[op_id]; > + unsigned int offset, naddrs; > + const u8 *addrs; > + > + switch (instr->type) { > + case NAND_OP_ADDR_INSTR: > + offset = nand_subop_get_addr_start_off(subop, op_id); > + naddrs = nand_subop_get_num_addr_cyc(subop, op_id); > + addrs = &instr->ctx.addr.addrs[offset]; > + > + nfc->data->parse_address(chip, addrs, naddrs, cmd); > + /* set NAND address */ > + nand_writel(nfc, NAND_ADDR1, nfc->addr1_reg); > + nand_writel(nfc, NAND_ADDR2, nfc->addr2_reg); > + break; > + case NAND_OP_DATA_IN_INSTR: > + case NAND_OP_DATA_OUT_INSTR: > + offset = nand_subop_get_data_start_off(subop, op_id); > + nfc->len = nand_subop_get_data_len(subop, op_id); > + if (instr->type == NAND_OP_DATA_IN_INSTR) > + nfc->buf = > + (void *)instr->ctx.data.buf.in + offset; > + else if (instr->type == NAND_OP_DATA_OUT_INSTR) > + nfc->buf = > + (void *)instr->ctx.data.buf.out + offset; The buf pointer feels clunky. You don't know for how long the buffer you point to will be valid, please don't do that. > + > + if (cmd & (CMD_READID | CMD_STATUS)) > + break; > + > + if (!IS_ALIGNED((u32)nfc->buf, chip->buf_align)) { > + dev_err(ls1x->dev, > + "nfc->buf %px is not aligned!\n", > + nfc->buf); > + return -EOPNOTSUPP; > + } else if (!IS_ALIGNED(nfc->len, chip->buf_align)) { > + dev_err(ls1x->dev, > + "nfc->len %u is not aligned!\n", > + nfc->len); > + return -EOPNOTSUPP; > + } > + > + /* set NAND data length */ > + nand_writel(nfc, NAND_OP_NUM, nfc->len); > + > + if (nfc->data->op_scope_field) { > + int op_scope = nfc->len << ffs(nfc->data->op_scope_field); > + > + regmap_update_bits(nfc->regmap, NAND_PARAM, > + nfc->data->op_scope_field, > + op_scope); > + } > + > + break; > + case NAND_OP_WAITRDY_INSTR: > + nfc->rdy_timeout = instr->ctx.waitrdy.timeout_ms; > + break; > + default: > + break; > + } > + } > + > + /* set NAND erase block count */ > + if (cmd & CMD_ERASE) > + nand_writel(nfc, NAND_OP_NUM, 1); > + /* set NAND operation region */ > + if (nfc->buf && nfc->len) > + cmd |= OP_SPARE | OP_MAIN; > + > + /* set NAND command */ > + nand_writel(nfc, NAND_CMD, cmd); > + /* Trigger operation */ > + regmap_write_bits(nfc->regmap, NAND_CMD, CMD_VALID, CMD_VALID); > + > + return 0; > +} > + > +static void ls1x_nand_dma_callback(void *data) > +{ > + struct ls1x_nand *ls1x = (struct ls1x_nand *)data; > + struct ls1x_nfc *nfc = &ls1x->nfc; > + enum dma_status status; > + > + status = dmaengine_tx_status(nfc->dma_chan, nfc->dma_cookie, NULL); > + if (likely(status == DMA_COMPLETE)) > + dev_dbg(ls1x->dev, "DMA complete with cookie=%d\n", > + nfc->dma_cookie); > + else > + dev_err(ls1x->dev, "DMA error with cookie=%d\n", > + nfc->dma_cookie); > + > + complete(&nfc->dma_complete); > +} > + > +static int ls1x_nand_dma_transfer(struct ls1x_nand *ls1x, bool is_write) > +{ > + struct ls1x_nfc *nfc = &ls1x->nfc; > + struct dma_chan *chan = nfc->dma_chan; > + struct dma_async_tx_descriptor *desc; > + enum dma_data_direction data_dir = > + is_write ? DMA_TO_DEVICE : DMA_FROM_DEVICE; > + enum dma_transfer_direction xfer_dir = > + is_write ? DMA_MEM_TO_DEV : DMA_DEV_TO_MEM; > + dma_addr_t dma_addr; > + int ret; > + > + dma_addr = dma_map_single(chan->device->dev, nfc->buf, nfc->len, > + data_dir); > + if (dma_mapping_error(chan->device->dev, dma_addr)) { > + dev_err(ls1x->dev, "failed to map DMA buffer!\n"); > + return -ENXIO; > + } > + > + desc = dmaengine_prep_slave_single(chan, dma_addr, nfc->len, xfer_dir, > + DMA_PREP_INTERRUPT); > + if (!desc) { > + dev_err(ls1x->dev, "failed to prepare DMA descriptor!\n"); > + ret = PTR_ERR(desc); > + goto err; > + } > + desc->callback = ls1x_nand_dma_callback; > + desc->callback_param = ls1x; > + > + nfc->dma_cookie = dmaengine_submit(desc); > + ret = dma_submit_error(nfc->dma_cookie); > + if (ret) { > + dev_err(ls1x->dev, "failed to submit DMA descriptor!\n"); > + goto err; > + } > + > + dev_dbg(ls1x->dev, "issue DMA with cookie=%d\n", nfc->dma_cookie); > + dma_async_issue_pending(chan); > + > + ret = wait_for_completion_timeout(&nfc->dma_complete, > + msecs_to_jiffies(nfc->rdy_timeout)); > + if (ret <= 0) { > + dev_err(ls1x->dev, "DMA timeout!%u\n", nfc->rdy_timeout); > + dmaengine_terminate_all(chan); > + ret = -EIO; > + } > + ret = 0; > +err: > + dma_unmap_single(chan->device->dev, dma_addr, nfc->len, data_dir); > + > + return ret; > +} > + > +static inline int ls1x_nand_wait_for_op_done(struct ls1x_nfc *nfc) > +{ > + unsigned int val; > + int ret = 0; > + > + /* Wait for operation done */ > + if (nfc->rdy_timeout) > + ret = regmap_read_poll_timeout(nfc->regmap, NAND_CMD, val, > + val & OP_DONE, 0, > + nfc->rdy_timeout * 1000); > + > + return ret; > +} > + > +static int ls1x_nand_reset_exec(struct nand_chip *chip, > + const struct nand_subop *subop) > +{ > + struct ls1x_nand *ls1x = nand_get_controller_data(chip); > + struct ls1x_nfc *nfc = &ls1x->nfc; > + int ret; > + > + ls1x_nand_set_controller(chip, subop, CMD_RESET); > + > + ret = ls1x_nand_wait_for_op_done(nfc); > + if (ret) > + dev_err(ls1x->dev, "CMD_RESET failed! %d\n", ret); > + > + return ret; > +} > + > +static int ls1x_nand_read_id_exec(struct nand_chip *chip, > + const struct nand_subop *subop) > +{ > + struct ls1x_nand *ls1x = nand_get_controller_data(chip); > + struct ls1x_nfc *nfc = &ls1x->nfc; > + long long idl = 0; > + int i, ret; > + > + ls1x_nand_set_controller(chip, subop, CMD_READID); > + > + ret = ls1x_nand_wait_for_op_done(nfc); > + if (ret) { > + dev_err(ls1x->dev, "CMD_READID failed! %d\n", ret); > + print_hex_dump_debug("REG: ", DUMP_PREFIX_OFFSET, 16, 4, > + nfc->reg_base, MAX_DUMP_REGS, false); > + return ret; > + } > + > + idl = __be32_to_cpu(nand_readl(nfc, NAND_IDL)); > + memset(nfc->buf, 0x0, nfc->len); > + > + for (i = 0; i < nfc->len; i++) { > + if (i > 0) > + nfc->buf[i] = (char)(idl >> (i - 1) * BITS_PER_BYTE); > + else > + nfc->buf[i] = (char)nand_readl(nfc, NAND_IDH_STATUS); > + } > + > + return ret; > +} > + > +static int ls1x_nand_erase_exec(struct nand_chip *chip, > + const struct nand_subop *subop) > +{ > + struct ls1x_nand *ls1x = nand_get_controller_data(chip); > + struct ls1x_nfc *nfc = &ls1x->nfc; > + int ret; > + > + ls1x_nand_set_controller(chip, subop, CMD_ERASE); No, you don't know what the command is gonna be, so if your controller forces the command opcodes, you need to go through this: https://elixir.bootlin.com/linux/v6.8.9/source/drivers/mtd/nand/raw/arasan-nand-controller.c#L819 and https://elixir.bootlin.com/linux/v6.8.9/source/drivers/mtd/nand/raw/arasan-nand-controller.c#L940 > + > + ret = ls1x_nand_wait_for_op_done(nfc); > + if (ret) { > + dev_err(ls1x->dev, "CMD_ERASE failed! %d\n", ret); > + print_hex_dump_debug("REG: ", DUMP_PREFIX_OFFSET, 16, 4, > + nfc->reg_base, MAX_DUMP_REGS, false); > + } > + > + return ret; > +} > + > +static int ls1x_nand_read_exec(struct nand_chip *chip, > + const struct nand_subop *subop) > +{ > + struct ls1x_nand *ls1x = nand_get_controller_data(chip); > + struct ls1x_nfc *nfc = &ls1x->nfc; > + bool is_write = false; > + int ret; > + > + ls1x_nand_set_controller(chip, subop, CMD_READ); > + > + ret = ls1x_nand_dma_transfer(ls1x, is_write); > + if (ret) > + return ret; > + > + ret = ls1x_nand_wait_for_op_done(nfc); > + if (ret) { > + dev_err(ls1x->dev, "CMD_READ failed! %d\n", ret); > + print_hex_dump_debug("REG: ", DUMP_PREFIX_OFFSET, 16, 4, > + nfc->reg_base, MAX_DUMP_REGS, false); > + } > + > + return ret; > +} > + > +static int ls1x_nand_write_exec(struct nand_chip *chip, > + const struct nand_subop *subop) > +{ > + struct ls1x_nand *ls1x = nand_get_controller_data(chip); > + struct ls1x_nfc *nfc = &ls1x->nfc; > + bool is_write = true; > + int ret; > + > + ls1x_nand_set_controller(chip, subop, CMD_WRITE); > + > + ret = ls1x_nand_dma_transfer(ls1x, is_write); > + if (ret) > + return ret; > + > + ret = ls1x_nand_wait_for_op_done(nfc); > + if (ret) { > + dev_err(ls1x->dev, "CMD_WRITE failed! %d\n", ret); > + print_hex_dump_debug("REG: ", DUMP_PREFIX_OFFSET, 16, 4, > + nfc->reg_base, MAX_DUMP_REGS, false); > + } > + > + return ret; > +} > + > +static int ls1x_nand_read_status_exec(struct nand_chip *chip, > + const struct nand_subop *subop) > +{ > + struct ls1x_nand *ls1x = nand_get_controller_data(chip); > + struct ls1x_nfc *nfc = &ls1x->nfc; > + int val, ret; > + > + ls1x_nand_set_controller(chip, subop, CMD_STATUS); > + > + ret = ls1x_nand_wait_for_op_done(nfc); > + if (ret) { > + dev_err(ls1x->dev, "CMD_STATUS failed! %d\n", ret); > + return ret; > + } > + > + val = nand_readl(nfc, NAND_IDH_STATUS) & ~nfc->data->status_field; > + nfc->buf[0] = val << ffs(nfc->data->status_field); > + > + return ret; > +} > + > +static const struct nand_op_parser ls1x_nand_op_parser = NAND_OP_PARSER( > + NAND_OP_PARSER_PATTERN( > + ls1x_nand_reset_exec, > + NAND_OP_PARSER_PAT_CMD_ELEM(false), > + NAND_OP_PARSER_PAT_WAITRDY_ELEM(false)), > + NAND_OP_PARSER_PATTERN( > + ls1x_nand_read_id_exec, > + NAND_OP_PARSER_PAT_CMD_ELEM(false), > + NAND_OP_PARSER_PAT_ADDR_ELEM(false, MAX_ADDR_CYC), > + NAND_OP_PARSER_PAT_DATA_IN_ELEM(false, 8)), > + NAND_OP_PARSER_PATTERN( > + ls1x_nand_erase_exec, > + NAND_OP_PARSER_PAT_CMD_ELEM(false), > + NAND_OP_PARSER_PAT_ADDR_ELEM(false, MAX_ADDR_CYC), > + NAND_OP_PARSER_PAT_CMD_ELEM(false), > + NAND_OP_PARSER_PAT_WAITRDY_ELEM(false)), > + NAND_OP_PARSER_PATTERN( > + ls1x_nand_read_exec, > + NAND_OP_PARSER_PAT_CMD_ELEM(false), > + NAND_OP_PARSER_PAT_ADDR_ELEM(false, MAX_ADDR_CYC), > + NAND_OP_PARSER_PAT_CMD_ELEM(false), > + NAND_OP_PARSER_PAT_WAITRDY_ELEM(true), > + NAND_OP_PARSER_PAT_DATA_IN_ELEM(false, 0)), > + NAND_OP_PARSER_PATTERN( > + ls1x_nand_write_exec, > + NAND_OP_PARSER_PAT_CMD_ELEM(false), > + NAND_OP_PARSER_PAT_ADDR_ELEM(false, MAX_ADDR_CYC), > + NAND_OP_PARSER_PAT_DATA_OUT_ELEM(false, 0), > + NAND_OP_PARSER_PAT_CMD_ELEM(false), > + NAND_OP_PARSER_PAT_WAITRDY_ELEM(true)), > + NAND_OP_PARSER_PATTERN( > + ls1x_nand_read_status_exec, > + NAND_OP_PARSER_PAT_CMD_ELEM(false), > + NAND_OP_PARSER_PAT_DATA_IN_ELEM(false, 1)), > + ); > + > +static int ls1x_nand_exec_op(struct nand_chip *chip, > + const struct nand_operation *op, bool check_only) > +{ > + return nand_op_parser_exec_op(chip, &ls1x_nand_op_parser, op, > + check_only); > +} > + > +static int ls1x_nand_attach_chip(struct nand_chip *chip) > +{ > + struct ls1x_nand *ls1x = nand_get_controller_data(chip); > + struct ls1x_nfc *nfc = &ls1x->nfc; > + u64 chipsize = nanddev_target_size(&chip->base); > + int cell_size = 0; > + > + switch (chipsize) { > + case SZ_128M: > + cell_size = 0x0; > + break; > + case SZ_256M: > + cell_size = 0x1; > + break; > + case SZ_512M: > + cell_size = 0x2; > + break; > + case SZ_1G: > + cell_size = 0x3; > + break; > + case SZ_2G: > + cell_size = 0x4; > + break; > + case SZ_4G: > + cell_size = 0x5; > + break; > + case (SZ_2G * SZ_4G): /* 8G */ > + cell_size = 0x6; > + break; > + case (SZ_4G * SZ_4G): /* 16G */ Why not SZ_8G and SZ_16G? > + cell_size = 0x7; > + break; > + default: > + dev_err(ls1x->dev, "unsupported chip size: %llu MB\n", > + chipsize); You should error out. > + break; > + } > + > + /* Set cell size */ > + regmap_update_bits(nfc->regmap, NAND_PARAM, CELL_SIZE_MASK, > + FIELD_PREP(CELL_SIZE_MASK, cell_size)); > + > + regmap_update_bits(nfc->regmap, NAND_TIMING, HOLD_CYCLE_MASK, > + FIELD_PREP(HOLD_CYCLE_MASK, nfc->data->hold_cycle)); > + regmap_update_bits(nfc->regmap, NAND_TIMING, WAIT_CYCLE_MASK, > + FIELD_PREP(WAIT_CYCLE_MASK, nfc->data->wait_cycle)); > + > + chip->ecc.read_page_raw = nand_monolithic_read_page_raw; > + chip->ecc.write_page_raw = nand_monolithic_write_page_raw; I need to further understand this, see other thread. > + chip->options |= NAND_MONOLITHIC_READ; > + > + return 0; > +} > + > +static const struct nand_controller_ops ls1x_nfc_ops = { > + .exec_op = ls1x_nand_exec_op, > + .attach_chip = ls1x_nand_attach_chip, > +}; > + > +static void ls1x_nand_controller_cleanup(struct ls1x_nand *ls1x) > +{ > + if (ls1x->nfc.dma_chan) > + dma_release_channel(ls1x->nfc.dma_chan); > +} > + > +static int ls1x_nand_controller_init(struct ls1x_nand *ls1x, > + struct platform_device *pdev) > +{ > + struct ls1x_nfc *nfc = &ls1x->nfc; > + struct dma_slave_config cfg; > + int ret; > + > + nfc->reg_base = devm_platform_ioremap_resource(pdev, 0); > + if (IS_ERR(nfc->reg_base)) > + return PTR_ERR(nfc->reg_base); > + > + nfc->regmap = devm_regmap_init_mmio(ls1x->dev, nfc->reg_base, > + &ls1x_nand_regmap_config); > + if (IS_ERR(nfc->regmap)) > + return dev_err_probe(ls1x->dev, PTR_ERR(nfc->regmap), > + "failed to init regmap\n"); > + > + nfc->dma_chan = dma_request_chan(ls1x->dev, "rxtx"); > + if (IS_ERR(nfc->dma_chan)) > + return dev_err_probe(ls1x->dev, PTR_ERR(nfc->dma_chan), > + "failed to request DMA channel\n"); > + dev_info(ls1x->dev, "got %s for %s access\n", > + dma_chan_name(nfc->dma_chan), dev_name(ls1x->dev)); Might be lowered to debug maybe? > + > + cfg.src_addr = CPHYSADDR(nfc->reg_base + NAND_DMA_ADDR); > + cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; > + cfg.dst_addr = CPHYSADDR(nfc->reg_base + NAND_DMA_ADDR); Doesn't feel right. That shall be a dma_addr_t, not a virtual pointer. > + cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES; > + > + ret = dmaengine_slave_config(nfc->dma_chan, &cfg); > + if (ret) { > + dev_err(ls1x->dev, "failed to config DMA channel\n"); > + dma_release_channel(nfc->dma_chan); > + return ret; > + } > + > + init_completion(&nfc->dma_complete); > + > + return 0; > +} > + > +static int ls1x_nand_chip_init(struct ls1x_nand *ls1x) > +{ > + int nchips = of_get_child_count(ls1x->dev->of_node); > + struct device_node *chip_np; > + struct nand_chip *chip = &ls1x->chip; > + struct mtd_info *mtd = nand_to_mtd(chip); > + int ret = 0; > + > + if (nchips != 1) > + return dev_err_probe(ls1x->dev, -EINVAL, > + "Currently one NAND chip supported\n"); > + > + chip_np = of_get_next_child(ls1x->dev->of_node, NULL); > + if (!chip_np) > + return dev_err_probe(ls1x->dev, -ENODEV, > + "failed to get child node for NAND chip\n"); > + > + chip->controller = &ls1x->controller; > + chip->options = NAND_NO_SUBPAGE_WRITE | NAND_USES_DMA | NAND_BROKEN_XD; > + chip->buf_align = 4; > + nand_set_controller_data(chip, ls1x); > + nand_set_flash_node(chip, chip_np); > + > + mtd->dev.parent = ls1x->dev; > + mtd->name = "ls1x-nand"; > + mtd->owner = THIS_MODULE; > + > + ret = nand_scan(chip, 1); > + if (ret) { > + of_node_put(chip_np); > + return ret; > + } > + > + ret = mtd_device_register(mtd, NULL, 0); > + if (ret) { > + dev_err(ls1x->dev, "failed to register MTD device! %d\n", ret); > + nand_cleanup(chip); > + of_node_put(chip_np); > + } > + > + return ret; > +} > + > +static int ls1x_nand_probe(struct platform_device *pdev) > +{ > + struct device *dev = &pdev->dev; > + const struct ls1x_nfc_data *data; > + struct ls1x_nand *ls1x; > + int ret; > + > + data = of_device_get_match_data(&pdev->dev); > + if (!data) > + return -ENODEV; > + > + ls1x = devm_kzalloc(dev, sizeof(*ls1x), GFP_KERNEL); > + if (!ls1x) > + return -ENOMEM; > + > + ls1x->nfc.data = data; > + ls1x->dev = dev; > + ls1x->controller.ops = &ls1x_nfc_ops; > + nand_controller_init(&ls1x->controller); It would feel more natural to perform the init and then add the ops. > + > + ret = ls1x_nand_controller_init(ls1x, pdev); > + if (ret) > + return ret; > + > + ret = ls1x_nand_chip_init(ls1x); > + if (ret) > + goto err; > + > + platform_set_drvdata(pdev, ls1x); > + > + return 0; > +err: > + ls1x_nand_controller_cleanup(ls1x); > + return ret; > +} > + > +static int ls1x_nand_remove(struct platform_device *pdev) > +{ > + struct ls1x_nand *ls1x = platform_get_drvdata(pdev); > + struct nand_chip *chip = &ls1x->chip; > + int ret; > + > + ret = mtd_device_unregister(nand_to_mtd(chip)); > + WARN_ON(ret); > + nand_cleanup(chip); > + ls1x_nand_controller_cleanup(ls1x); > + > + return 0; > +} > + > +static const struct ls1x_nfc_data ls1b_nfc_data = { > + .status_field = GENMASK(15, 8), > + .hold_cycle = 0x2, > + .wait_cycle = 0xc, > + .parse_address = ls1b_nand_parse_address, > +}; > + > +static const struct ls1x_nfc_data ls1c_nfc_data = { > + .status_field = GENMASK(23, 16), > + .op_scope_field = GENMASK(29, 16), > + .hold_cycle = 0x2, > + .wait_cycle = 0xc, > + .parse_address = ls1c_nand_parse_address, > +}; > + > +static const struct of_device_id ls1x_nfc_match[] = { > + { .compatible = "loongson,ls1b-nfc", .data = &ls1b_nfc_data }, > + { .compatible = "loongson,ls1c-nfc", .data = &ls1c_nfc_data }, > + { /* sentinel */ } > +}; > +MODULE_DEVICE_TABLE(of, ls1x_nfc_match); > + > +static struct platform_driver ls1x_nand_driver = { > + .probe = ls1x_nand_probe, > + .remove = ls1x_nand_remove, > + .driver = { > + .name = KBUILD_MODNAME, > + .of_match_table = ls1x_nfc_match, > + }, > +}; > + > +module_platform_driver(ls1x_nand_driver); > + > +MODULE_AUTHOR("Keguang Zhang <keguang.zhang@xxxxxxxxx>"); > +MODULE_DESCRIPTION("Loongson-1 NAND Controller driver"); > +MODULE_LICENSE("GPL"); > Thanks, Miquèl
