[PATCH V5] mtd: rawnand: add Loongson1 NAND driver
Keguang Zhang
keguang.zhang at gmail.com
Thu May 20 05:54:41 PDT 2021
From: Keguang Zhang <keguang.zhang at unisoc.com>
This patch adds NAND driver for Loongson1B.
Signed-off-by: Keguang Zhang <keguang.zhang at unisoc.com>
---
V4 -> 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.
V3 -> V4:
Retrieve the controller from nand_hw_control.
V2 -> V3:
Replace __raw_readl/__raw_writel with readl/writel.
Split ls1x_nand into two structures: ls1x_nand_chip and
ls1x_nand_controller.
V1 -> V2:
Modify the dependency in Kconfig due to the changes of DMA
module.
---
drivers/mtd/nand/raw/Kconfig | 8 +
drivers/mtd/nand/raw/Makefile | 1 +
drivers/mtd/nand/raw/loongson1_nand.c | 770 ++++++++++++++++++++++++++
3 files changed, 779 insertions(+)
create mode 100644 drivers/mtd/nand/raw/loongson1_nand.c
diff --git a/drivers/mtd/nand/raw/Kconfig b/drivers/mtd/nand/raw/Kconfig
index 30f061939560..63402e335df4 100644
--- a/drivers/mtd/nand/raw/Kconfig
+++ b/drivers/mtd/nand/raw/Kconfig
@@ -453,6 +453,14 @@ config MTD_NAND_ROCKCHIP
NFC v800: RK3308, RV1108
NFC v900: PX30, RK3326
+config MTD_NAND_LOONGSON1
+ tristate "Support for Loongson1 SoC NAND controller"
+ depends on MACH_LOONGSON32
+ select MTD_NAND_ECC_SW_HAMMING
+ select LOONGSON1_DMA
+ 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 d011c6c53f8f..50a51ad6ec21 100644
--- a/drivers/mtd/nand/raw/Makefile
+++ b/drivers/mtd/nand/raw/Makefile
@@ -57,6 +57,7 @@ obj-$(CONFIG_MTD_NAND_CADENCE) += cadence-nand-controller.o
obj-$(CONFIG_MTD_NAND_ARASAN) += arasan-nand-controller.o
obj-$(CONFIG_MTD_NAND_INTEL_LGM) += intel-nand-controller.o
obj-$(CONFIG_MTD_NAND_ROCKCHIP) += rockchip-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..b06e36ec32da
--- /dev/null
+++ b/drivers/mtd/nand/raw/loongson1_nand.c
@@ -0,0 +1,770 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * NAND Flash Driver for Loongson 1 SoC
+ *
+ * Copyright (C) 2015-2021 Zhang, Keguang <keguang.zhang at gmail.com>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/clk.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/platform_device.h>
+#include <linux/sizes.h>
+
+#include <nand.h>
+
+/* Loongson 1 NAND Register Definitions */
+#define NAND_CMD 0x0
+#define NAND_ADDR1 0x4
+#define NAND_ADDR2 0x8
+#define NAND_TIMING 0xc
+#define NAND_IDL 0x10
+#define NAND_IDH 0x14
+#define NAND_STATUS 0x15
+#define NAND_PARAM 0x18
+#define NAND_OP_NUM 0x1c
+#define NAND_CS_RDY 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)
+
+#define MAX_ADDR_CYC 5U
+#define MAX_ID_SIZE (NAND_STATUS - NAND_IDL)
+#define SIZE_MASK GENMASK(11, 8)
+
+#define BITS_PER_WORD 32
+
+/* macros for registers read/write */
+#define nand_readl(nc, off) \
+ readl((nc)->reg_base + (off))
+
+#define nand_writel(nc, off, val) \
+ writel((val), (nc)->reg_base + (off))
+
+struct ls1x_nand_controller {
+ void __iomem *reg_base;
+ __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 clk *clk;
+ struct nand_chip chip;
+ struct nand_controller controller;
+ struct ls1x_nand_controller nc;
+ struct plat_ls1x_nand *pdata;
+};
+
+static void ls1x_nand_dump_regs(struct nand_chip *chip)
+{
+ struct ls1x_nand *nand = nand_get_controller_data(chip);
+ struct ls1x_nand_controller *nc = &nand->nc;
+
+ print_hex_dump(KERN_INFO, "REG: ", DUMP_PREFIX_OFFSET, 16, 4,
+ nc->reg_base, 0x44, false);
+}
+
+static void ls1x_nand_dma_callback(void *data)
+{
+ struct ls1x_nand *nand = (struct ls1x_nand *)data;
+ struct ls1x_nand_controller *nc = &nand->nc;
+ enum dma_status status;
+
+ status = dmaengine_tx_status(nc->dma_chan, nc->dma_cookie, NULL);
+ if (likely(status == DMA_COMPLETE))
+ dev_dbg(nand->dev, "DMA complete with cookie=%d\n",
+ nc->dma_cookie);
+ else
+ dev_err(nand->dev, "DMA error with cookie=%d\n",
+ nc->dma_cookie);
+
+ complete(&nc->dma_complete);
+}
+
+static int ls1x_nand_dma_transfer(struct ls1x_nand *nand, bool is_write)
+{
+ struct ls1x_nand_controller *nc = &nand->nc;
+ struct dma_chan *chan = nc->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, nc->buf, nc->len,
+ data_dir);
+ if (dma_mapping_error(chan->device->dev, dma_addr)) {
+ dev_err(nand->dev, "failed to map DMA buffer!\n");
+ return -ENXIO;
+ }
+
+ desc = dmaengine_prep_slave_single(chan, dma_addr, nc->len, xfer_dir,
+ DMA_PREP_INTERRUPT);
+ if (!desc) {
+ dev_err(nand->dev, "failed to prepare DMA descriptor!\n");
+ ret = PTR_ERR(desc);
+ goto err;
+ }
+ desc->callback = ls1x_nand_dma_callback;
+ desc->callback_param = nand;
+
+ nc->dma_cookie = dmaengine_submit(desc);
+ ret = dma_submit_error(nc->dma_cookie);
+ if (ret) {
+ dev_err(nand->dev, "failed to submit DMA descriptor!\n");
+ goto err;
+ }
+
+ dev_dbg(nand->dev, "issue DMA with cookie=%d\n", nc->dma_cookie);
+ dma_async_issue_pending(chan);
+
+ ret = wait_for_completion_timeout(&nc->dma_complete,
+ msecs_to_jiffies(nc->rdy_timeout));
+ if (ret <= 0) {
+ dev_err(nand->dev, "DMA timeout!\n");
+ dmaengine_terminate_all(chan);
+ ret = -EIO;
+ }
+ ret = 0;
+err:
+ dma_unmap_single(chan->device->dev, dma_addr, nc->len, data_dir);
+
+ return ret;
+}
+
+static inline void ls1x_nand_parse_address(struct nand_chip *chip,
+ const u8 *addrs,
+ unsigned int naddrs, int cmd)
+{
+ struct ls1x_nand *nand = nand_get_controller_data(chip);
+ struct ls1x_nand_controller *nc = &nand->nc;
+#if defined(CONFIG_LOONGSON1_LS1B)
+ unsigned int page_shift = chip->page_shift + 1;
+#endif
+ int i;
+
+ nc->addr1_reg = 0;
+ nc->addr2_reg = 0;
+#if defined(CONFIG_LOONGSON1_LS1B)
+ if (cmd == CMD_ERASE) {
+ page_shift = chip->page_shift;
+
+ for (i = 0; i < min(MAX_ADDR_CYC - 2, naddrs); i++)
+ nc->addr1_reg |=
+ (u32)addrs[i] << (page_shift + BITS_PER_BYTE * i);
+ if (i == MAX_ADDR_CYC - 2)
+ nc->addr2_reg |=
+ (u32)addrs[i] >> (BITS_PER_WORD - page_shift -
+ BITS_PER_BYTE * (i - 1));
+
+ return;
+ }
+
+ for (i = 0; i < min(2U, naddrs); i++)
+ nc->addr1_reg |= (u32)addrs[i] << BITS_PER_BYTE * i;
+ for (i = 2; i < min(MAX_ADDR_CYC, naddrs); i++)
+ nc->addr1_reg |=
+ (u32)addrs[i] << (page_shift + BITS_PER_BYTE * (i - 2));
+ if (i == MAX_ADDR_CYC)
+ nc->addr2_reg |=
+ (u32)addrs[i] >> (BITS_PER_WORD - page_shift -
+ BITS_PER_BYTE * (i - 1));
+#elif defined(CONFIG_LOONGSON1_LS1C)
+ if (cmd == CMD_ERASE) {
+ for (i = 0; i < min(MAX_ADDR_CYC, naddrs); i++)
+ nc->addr2_reg |= (u32)addrs[i] << BITS_PER_BYTE * i;
+
+ return;
+ }
+
+ for (i = 0; i < min(MAX_ADDR_CYC, naddrs); i++) {
+ if (i < 2)
+ nc->addr1_reg |= (u32)addrs[i] << BITS_PER_BYTE * i;
+ else
+ nc->addr2_reg |=
+ (u32)addrs[i] << BITS_PER_BYTE * (i - 2);
+ }
+#endif
+}
+
+static int ls1x_nand_set_controller(struct nand_chip *chip,
+ const struct nand_subop *subop, int cmd)
+{
+ struct ls1x_nand *nand = nand_get_controller_data(chip);
+ struct ls1x_nand_controller *nc = &nand->nc;
+ unsigned int op_id;
+
+ nc->buf = NULL;
+ nc->len = 0;
+ nc->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_CMD_INSTR:
+ break;
+ 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];
+
+ ls1x_nand_parse_address(chip, addrs, naddrs, cmd);
+ /* set NAND address */
+ nand_writel(nc, NAND_ADDR1, nc->addr1_reg);
+ nand_writel(nc, NAND_ADDR2, nc->addr2_reg);
+ break;
+ case NAND_OP_DATA_IN_INSTR:
+ offset = nand_subop_get_data_start_off(subop, op_id);
+ nc->len = nand_subop_get_data_len(subop, op_id);
+ nc->buf = instr->ctx.data.buf.in + offset;
+
+ if (!IS_ALIGNED(nc->len, chip->buf_align) ||
+ !IS_ALIGNED((unsigned int)nc->buf, chip->buf_align))
+ return -ENOTSUPP;
+ /* set NAND data length */
+ nand_writel(nc, NAND_OP_NUM, nc->len);
+ break;
+ case NAND_OP_DATA_OUT_INSTR:
+ offset = nand_subop_get_data_start_off(subop, op_id);
+ nc->len = nand_subop_get_data_len(subop, op_id);
+ nc->buf = (void *)instr->ctx.data.buf.out + offset;
+
+ if (!IS_ALIGNED(nc->len, chip->buf_align) ||
+ !IS_ALIGNED((unsigned int)nc->buf, chip->buf_align))
+ return -ENOTSUPP;
+ /* set NAND data length */
+ nand_writel(nc, NAND_OP_NUM, nc->len);
+ break;
+ case NAND_OP_WAITRDY_INSTR:
+ nc->rdy_timeout = instr->ctx.waitrdy.timeout_ms;
+ break;
+ }
+ }
+
+ /*set NAND erase block count */
+ if (cmd & CMD_ERASE)
+ nand_writel(nc, NAND_OP_NUM, 1);
+ /*set NAND operation region */
+ if (nc->buf && nc->len) {
+ if (nc->addr1_reg & BIT(chip->page_shift))
+ cmd |= OP_SPARE;
+ else
+ cmd |= OP_SPARE | OP_MAIN;
+ }
+
+ /*set NAND command */
+ nand_writel(nc, NAND_CMD, cmd);
+ /* Trigger operation */
+ nand_writel(nc, NAND_CMD, nand_readl(nc, NAND_CMD) | CMD_VALID);
+
+ return 0;
+}
+
+static inline int ls1x_nand_wait_for_op_done(struct ls1x_nand_controller *nc)
+{
+ unsigned int val;
+ int ret = 0;
+
+ /* Wait for operation done */
+ if (nc->rdy_timeout)
+ ret = readl_relaxed_poll_timeout(nc->reg_base + NAND_CMD, val,
+ val & OP_DONE, 0,
+ nc->rdy_timeout * 1000);
+
+ return ret;
+}
+
+static int ls1x_nand_reset_exec(struct nand_chip *chip,
+ const struct nand_subop *subop)
+{
+ struct ls1x_nand *nand = nand_get_controller_data(chip);
+ struct ls1x_nand_controller *nc = &nand->nc;
+ int ret;
+
+ ls1x_nand_set_controller(chip, subop, CMD_RESET);
+
+ ret = ls1x_nand_wait_for_op_done(nc);
+ if (ret)
+ dev_err(nand->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 *nand = nand_get_controller_data(chip);
+ struct ls1x_nand_controller *nc = &nand->nc;
+ int idl, i;
+ int ret;
+
+ ls1x_nand_set_controller(chip, subop, CMD_READID);
+
+ ret = ls1x_nand_wait_for_op_done(nc);
+ if (ret) {
+ dev_err(nand->dev, "CMD_READID failed! %d\n", ret);
+ return ret;
+ }
+
+ idl = (nand_readl(nc, NAND_IDL));
+ for (i = 0; i < min_t(unsigned int, nc->len, MAX_ID_SIZE); i++)
+ if (i > 0)
+ nc->buf[i] = *((char *)&idl + 4 - i);
+ else
+ nc->buf[i] = (char)(nand_readl(nc, NAND_IDH));
+
+ return ret;
+}
+
+static int ls1x_nand_erase_exec(struct nand_chip *chip,
+ const struct nand_subop *subop)
+{
+ struct ls1x_nand *nand = nand_get_controller_data(chip);
+ struct ls1x_nand_controller *nc = &nand->nc;
+ int ret;
+
+ ls1x_nand_set_controller(chip, subop, CMD_ERASE);
+
+ ret = ls1x_nand_wait_for_op_done(nc);
+ if (ret)
+ dev_err(nand->dev, "CMD_ERASE failed! %d\n", ret);
+
+ return ret;
+}
+
+static int ls1x_nand_read_exec(struct nand_chip *chip,
+ const struct nand_subop *subop)
+{
+ struct ls1x_nand *nand = nand_get_controller_data(chip);
+ struct ls1x_nand_controller *nc = &nand->nc;
+ int ret;
+
+ ls1x_nand_set_controller(chip, subop, CMD_READ);
+
+ ret = ls1x_nand_dma_transfer(nand, false);
+ if (ret)
+ return ret;
+
+ ret = ls1x_nand_wait_for_op_done(nc);
+ if (ret)
+ dev_err(nand->dev, "CMD_READ failed! %d\n", ret);
+
+ return ret;
+}
+
+static int ls1x_nand_write_exec(struct nand_chip *chip,
+ const struct nand_subop *subop)
+{
+ struct ls1x_nand *nand = nand_get_controller_data(chip);
+ struct ls1x_nand_controller *nc = &nand->nc;
+ int ret;
+
+ ls1x_nand_set_controller(chip, subop, CMD_WRITE);
+
+ ret = ls1x_nand_dma_transfer(nand, true);
+ if (ret)
+ return ret;
+
+ ret = ls1x_nand_wait_for_op_done(nc);
+ if (ret)
+ dev_err(nand->dev, "CMD_WRITE failed! %d\n", ret);
+
+ return ret;
+}
+
+static int ls1x_nand_read_status_exec(struct nand_chip *chip,
+ const struct nand_subop *subop)
+{
+ struct ls1x_nand *nand = nand_get_controller_data(chip);
+ struct ls1x_nand_controller *nc = &nand->nc;
+ int ret;
+
+ ls1x_nand_set_controller(chip, subop, CMD_STATUS);
+
+ ret = ls1x_nand_wait_for_op_done(nc);
+ if (ret) {
+ dev_err(nand->dev, "CMD_STATUS failed! %d\n", ret);
+ return ret;
+ }
+
+ nc->buf[0] = nand_readl(nc, NAND_IDH) >> BITS_PER_BYTE;
+
+ 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_read_subpage(struct nand_chip *chip,
+ unsigned int data_offs, unsigned int readlen,
+ unsigned char *bufpoi, int page)
+{
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ int start_step, end_step, num_steps, ret;
+ char *p;
+ int data_col_addr, i;
+ int datafrag_len, eccfrag_len, aligned_len, aligned_pos;
+ int busw = (chip->options & NAND_BUSWIDTH_16) ? 2 : 1;
+ int index, section = 0;
+ unsigned int max_bitflips = 0;
+ struct mtd_oob_region oobregion = { };
+
+ /* Read the whole page and OOB data */
+ ret = chip->ecc.read_page_raw(chip, bufpoi, 1, page);
+ if (ret)
+ return ret;
+
+ /* Column address within the page aligned to ECC size (256bytes) */
+ start_step = data_offs / chip->ecc.size;
+ end_step = (data_offs + readlen - 1) / chip->ecc.size;
+ num_steps = end_step - start_step + 1;
+ index = start_step * chip->ecc.bytes;
+
+ /* Data size aligned to ECC ecc.size */
+ datafrag_len = num_steps * chip->ecc.size;
+ eccfrag_len = num_steps * chip->ecc.bytes;
+
+ data_col_addr = start_step * chip->ecc.size;
+ /* If we read not a page aligned data */
+ p = bufpoi + data_col_addr;
+
+ /* Calculate ECC */
+ for (i = 0; i < eccfrag_len; i += chip->ecc.bytes, p += chip->ecc.size)
+ chip->ecc.calculate(chip, p, &chip->ecc.calc_buf[i]);
+
+ ret = mtd_ooblayout_find_eccregion(mtd, index, §ion, &oobregion);
+ if (ret)
+ return ret;
+
+ aligned_pos = oobregion.offset & ~(busw - 1);
+ aligned_len = eccfrag_len;
+ if (oobregion.offset & (busw - 1))
+ aligned_len++;
+ if ((oobregion.offset + (num_steps * chip->ecc.bytes)) & (busw - 1))
+ aligned_len++;
+
+ memcpy(&chip->oob_poi[aligned_pos],
+ bufpoi + mtd->writesize + aligned_pos, aligned_len);
+
+ ret = mtd_ooblayout_get_eccbytes(mtd, chip->ecc.code_buf,
+ chip->oob_poi, index, eccfrag_len);
+ if (ret)
+ return ret;
+
+ p = bufpoi + data_col_addr;
+ for (i = 0; i < eccfrag_len; i += chip->ecc.bytes, p += chip->ecc.size) {
+ int stat;
+
+ stat = chip->ecc.correct(chip, p, &chip->ecc.code_buf[i],
+ &chip->ecc.calc_buf[i]);
+ if (stat)
+ ls1x_nand_dump_regs(chip);
+
+ if (stat == -EBADMSG &&
+ (chip->ecc.options & NAND_ECC_GENERIC_ERASED_CHECK)) {
+ /* check for empty pages with bitflips */
+ stat = nand_check_erased_ecc_chunk(p, chip->ecc.size,
+ &chip->ecc.code_buf[i],
+ chip->ecc.bytes,
+ NULL, 0,
+ chip->ecc.strength);
+ }
+
+ if (stat < 0) {
+ mtd->ecc_stats.failed++;
+ } else {
+ mtd->ecc_stats.corrected += stat;
+ max_bitflips = max_t(unsigned int, max_bitflips, stat);
+ }
+ }
+ return max_bitflips;
+}
+
+static int ls1x_nand_attach_chip(struct nand_chip *chip)
+{
+ struct ls1x_nand *nand = nand_get_controller_data(chip);
+ struct ls1x_nand_controller *nc = &nand->nc;
+ struct plat_ls1x_nand *pdata = nand->pdata;
+ int hold_cycle = pdata->hold_cycle;
+ int wait_cycle = pdata->wait_cycle;
+ 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 */
+ cell_size = 0x7;
+ break;
+ default:
+ dev_err(nand->dev, "unsupported chip size: %llu MB\n",
+ chipsize);
+ break;
+ }
+
+ if (hold_cycle && wait_cycle)
+ nand_writel(nc, NAND_TIMING,
+ (hold_cycle << BITS_PER_BYTE) | wait_cycle);
+ nand_writel(nc, NAND_PARAM,
+ (nand_readl(nc, NAND_PARAM) & ~SIZE_MASK) | cell_size <<
+ BITS_PER_BYTE);
+
+ chip->ecc.read_page_raw = nand_monolithic_read_page_raw;
+ chip->ecc.write_page_raw = nand_monolithic_write_page_raw;
+
+ return 0;
+}
+
+static const struct nand_controller_ops ls1x_nc_ops = {
+ .exec_op = ls1x_nand_exec_op,
+ .attach_chip = ls1x_nand_attach_chip,
+};
+
+static void ls1x_nand_controller_cleanup(struct ls1x_nand *nand)
+{
+ if (nand->nc.dma_chan)
+ dma_release_channel(nand->nc.dma_chan);
+}
+
+static int ls1x_nand_controller_init(struct ls1x_nand *nand,
+ struct platform_device *pdev)
+{
+ struct ls1x_nand_controller *nc = &nand->nc;
+ struct device *dev = &pdev->dev;
+ struct dma_slave_config cfg;
+ struct resource *res;
+ int ret;
+
+ nc->reg_base = devm_platform_ioremap_resource(pdev, 0);
+ if (IS_ERR(nc->reg_base))
+ return PTR_ERR(nc->reg_base);
+
+ res = platform_get_resource(pdev, IORESOURCE_DMA, 0);
+ if (!res) {
+ dev_err(dev, "failed to get DMA information!\n");
+ return -ENXIO;
+ }
+
+ nc->dma_chan = dma_request_chan(dev, res->name);
+ if (!nc->dma_chan) {
+ dev_err(dev, "failed to request DMA channel!\n");
+ return -EBUSY;
+ }
+ dev_info(dev, "got %s for %s access\n",
+ dma_chan_name(nc->dma_chan), dev_name(dev));
+
+ cfg.src_addr = CPHYSADDR(nc->reg_base + NAND_DMA_ADDR);
+ cfg.dst_addr = CPHYSADDR(nc->reg_base + NAND_DMA_ADDR);
+ cfg.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ cfg.dst_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
+ ret = dmaengine_slave_config(nc->dma_chan, &cfg);
+ if (ret) {
+ dev_err(dev, "failed to config DMA channel!\n");
+ dma_release_channel(nc->dma_chan);
+ return ret;
+ }
+
+ init_completion(&nc->dma_complete);
+
+ return 0;
+}
+
+static int ls1x_nand_chip_init(struct ls1x_nand *nand)
+{
+ struct nand_chip *chip = &nand->chip;
+ struct mtd_info *mtd = nand_to_mtd(chip);
+ struct plat_ls1x_nand *pdata = nand->pdata;
+ int ret = 0;
+
+ chip->controller = &nand->controller;
+ chip->options = NAND_NO_SUBPAGE_WRITE | NAND_USES_DMA | NAND_BROKEN_XD;
+ chip->buf_align = 16;
+ chip->ecc.engine_type = NAND_ECC_ENGINE_TYPE_SOFT;
+ chip->ecc.algo = NAND_ECC_ALGO_HAMMING;
+ nand_set_controller_data(chip, nand);
+
+ mtd->dev.parent = nand->dev;
+ mtd->name = "ls1x-nand";
+ mtd->owner = THIS_MODULE;
+
+ ret = nand_scan(chip, 1);
+ if (ret)
+ return ret;
+
+ chip->ecc.read_subpage = ls1x_nand_read_subpage;
+
+ ret = mtd_device_register(mtd, pdata->parts, pdata->nr_parts);
+ if (ret) {
+ dev_err(nand->dev, "failed to register MTD device! %d\n", ret);
+ nand_cleanup(chip);
+ }
+
+ return ret;
+}
+
+static int ls1x_nand_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct plat_ls1x_nand *pdata;
+ struct ls1x_nand *nand;
+ int ret;
+
+ pdata = dev_get_platdata(dev);
+ if (!pdata) {
+ dev_err(dev, "platform data missing!\n");
+ return -EINVAL;
+ }
+
+ nand = devm_kzalloc(dev, sizeof(*nand), GFP_KERNEL);
+ if (!nand)
+ return -ENOMEM;
+
+ nand->pdata = pdata;
+ nand->dev = dev;
+ nand->controller.ops = &ls1x_nc_ops;
+ nand_controller_init(&nand->controller);
+
+ ret = ls1x_nand_controller_init(nand, pdev);
+ if (ret)
+ return ret;
+
+ nand->clk = devm_clk_get(dev, pdev->name);
+ if (IS_ERR(nand->clk)) {
+ dev_err(dev, "failed to get %s clock!\n", pdev->name);
+ return PTR_ERR(nand->clk);
+ }
+ clk_prepare_enable(nand->clk);
+
+ ret = ls1x_nand_chip_init(nand);
+ if (ret) {
+ clk_disable_unprepare(nand->clk);
+ goto err;
+ }
+
+ platform_set_drvdata(pdev, nand);
+ dev_info(dev, "Loongson1 NAND driver registered\n");
+
+ return 0;
+err:
+ ls1x_nand_controller_cleanup(nand);
+ return ret;
+}
+
+static int ls1x_nand_remove(struct platform_device *pdev)
+{
+ struct ls1x_nand *nand = platform_get_drvdata(pdev);
+ struct nand_chip *chip = &nand->chip;
+
+ mtd_device_unregister(nand_to_mtd(chip));
+ nand_cleanup(chip);
+ clk_disable_unprepare(nand->clk);
+ ls1x_nand_controller_cleanup(nand);
+
+ return 0;
+}
+
+static struct platform_driver ls1x_nand_driver = {
+ .probe = ls1x_nand_probe,
+ .remove = ls1x_nand_remove,
+ .driver = {
+ .name = "ls1x-nand",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(ls1x_nand_driver);
+
+MODULE_AUTHOR("Kelvin Cheung <keguang.zhang at gmail.com>");
+MODULE_DESCRIPTION("Loongson1 NAND Flash driver");
+MODULE_LICENSE("GPL");
base-commit: fd0d8d85f7230052e638a56d1bfea170c488e6bc
--
2.25.1
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