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Message-ID: <20141130093529.GH3608@norris-Latitude-E6410>
Date: Sun, 30 Nov 2014 01:35:29 -0800
From: Brian Norris <computersforpeace@...il.com>
To: Zhou Wang <wangzhou.bry@...il.com>
Cc: David Woodhouse <dwmw2@...radead.org>,
linux-mtd@...ts.infradead.org, devicetree@...r.kernel.org,
mark.rutland@....com, pawel.moll@....com,
ijc+devicetree@...lion.org.uk, robh+dt@...nel.org,
galak@...eaurora.org, caizhiyong@...wei.com,
haojian.zhuang@...il.com, xuwei5@...ilicon.com,
wangzhou1@...ilicon.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/2] mtd: hisilicon: add a new NAND controller driver
for hisilicon hip04 Soc
On Tue, Nov 04, 2014 at 08:47:00PM +0800, Zhou Wang wrote:
> Signed-off-by: Zhou Wang <wangzhou.bry@...il.com>
This driver mostly looks good. A few comments.
> ---
> drivers/mtd/nand/Kconfig | 5 +
> drivers/mtd/nand/Makefile | 1 +
> drivers/mtd/nand/hisi504_nand.c | 846 +++++++++++++++++++++++++++++++++++++++
> 3 files changed, 852 insertions(+)
> create mode 100644 drivers/mtd/nand/hisi504_nand.c
>
> diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
> index dd10646..e451a08 100644
> --- a/drivers/mtd/nand/Kconfig
> +++ b/drivers/mtd/nand/Kconfig
> @@ -516,4 +516,9 @@ config MTD_NAND_XWAY
> Enables support for NAND Flash chips on Lantiq XWAY SoCs. NAND is attached
> to the External Bus Unit (EBU).
>
> +config MTD_NAND_HISI504
> + tristate "Support for NAND controller on Hisilicon SoC Hip04"
> + help
> + Enables support for NAND controller on Hisilicon SoC Hip04.
> +
> endif # MTD_NAND
You'll want to rebase on l2-mtd.git when you resend. There are some
small Kconfig and Makefile conflicts. (I can fix them myself, but if
you're going to resend anyway...)
> diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
> index 9c847e4..fb1b2e4 100644
> --- a/drivers/mtd/nand/Makefile
> +++ b/drivers/mtd/nand/Makefile
> @@ -50,5 +50,6 @@ obj-$(CONFIG_MTD_NAND_JZ4740) += jz4740_nand.o
> obj-$(CONFIG_MTD_NAND_GPMI_NAND) += gpmi-nand/
> obj-$(CONFIG_MTD_NAND_XWAY) += xway_nand.o
> obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH) += bcm47xxnflash/
> +obj-$(CONFIG_MTD_NAND_HISI504) += hisi504_nand.o
>
> nand-objs := nand_base.o nand_bbt.o nand_timings.o
> diff --git a/drivers/mtd/nand/hisi504_nand.c b/drivers/mtd/nand/hisi504_nand.c
> new file mode 100644
> index 0000000..a169cd8
> --- /dev/null
> +++ b/drivers/mtd/nand/hisi504_nand.c
> @@ -0,0 +1,846 @@
> +/*
> + * Hisilicon NAND Flash controller driver
> + *
> + * Copyright © 2012-2014 HiSilicon Technologies Co., Ltd.
> + * http://www.hisilicon.com
> + *
> + * Author: Zhou Wang <wangzhou.bry@...il.com>
> + * The initial developer of the original code is Zhiyong Cai
> + * <caizhiyong@...wei.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation; either version 2 of the License, or
> + * (at your option) any later version.
> + *
> + * 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/of.h>
> +#include <linux/of_mtd.h>
> +#include <linux/mtd/mtd.h>
> +#include <linux/sizes.h>
> +#include <linux/clk.h>
> +#include <linux/slab.h>
> +#include <linux/module.h>
> +#include <linux/delay.h>
> +#include <linux/interrupt.h>
> +#include <linux/mtd/nand.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/platform_device.h>
> +#include <linux/mtd/partitions.h>
> +
> +#define HINFC504_MAX_CHIP (4)
> +#define HINFC504_W_LATCH (5)
> +#define HINFC504_R_LATCH (7)
> +#define HINFC504_RW_LATCH (3)
> +
> +#define HINFC504_NFC_TIMEOUT (2 * HZ)
> +#define HINFC504_NFC_DMA_TIMEOUT (5 * HZ)
> +#define HINFC504_CHIP_DELAY (25)
> +
> +#define HINFC504_REG_BASE_ADDRESS_LEN (0x100)
> +#define HINFC504_BUFFER_BASE_ADDRESS_LEN (2048 + 128)
> +
> +#define HINFC504_ADDR_CYCLE_MASK 0x4
> +
> +#define HINFC504_CON 0x00
> +#define HINFC504_CON_OP_MODE_NORMAL (1U << 0)
> +#define HINFC504_CON_PAGEISZE_SHIFT (1)
> +#define HINFC504_CON_PAGESIZE_MASK (0x07)
> +#define HINFC504_CON_BUS_WIDTH (1U << 4)
> +#define HINFC504_CON_READY_BUSY_SEL (1U << 8)
> +#define HINFC504_CON_ECCTYPE_SHIFT (9)
> +#define HINFC504_CON_ECCTYPE_MASK (0x07)
> +
> +#define HINFC504_PWIDTH 0x04
> +#define SET_HINFC504_PWIDTH(_w_lcnt, _r_lcnt, _rw_hcnt) \
> + ((_w_lcnt) | (((_r_lcnt) & 0x0F) << 4) | (((_rw_hcnt) & 0x0F) << 8))
> +
> +#define HINFC504_CMD 0x0C
> +#define HINFC504_ADDRL 0x10
> +#define HINFC504_ADDRH 0x14
> +#define HINFC504_DATA_NUM 0x18
> +
> +#define HINFC504_OP 0x1C
> +#define HINFC504_OP_READ_DATA_EN (1U << 1)
> +#define HINFC504_OP_WAIT_READY_EN (1U << 2)
> +#define HINFC504_OP_CMD2_EN (1U << 3)
> +#define HINFC504_OP_WRITE_DATA_EN (1U << 4)
> +#define HINFC504_OP_ADDR_EN (1U << 5)
> +#define HINFC504_OP_CMD1_EN (1U << 6)
Might try the BIT() macros here.
> +#define HINFC504_OP_NF_CS_SHIFT (7)
> +#define HINFC504_OP_NF_CS_MASK (3)
> +#define HINFC504_OP_ADDR_CYCLE_SHIFT (9)
> +#define HINFC504_OP_ADDR_CYCLE_MASK (7)
> +
> +#define HINFC504_STATUS 0x20
> +#define HINFC504_READY (1U << 0)
> +
> +#define HINFC504_INTEN 0x24
> +#define HINFC504_INTEN_DMA (1U << 9)
> +#define HINFC504_INTEN_UE (1U << 6)
> +#define HINFC504_INTEN_CE (1U << 5)
Same here, and in the next few blocks.
> +
> +#define HINFC504_INTS 0x28
> +#define HINFC504_INTS_DMA (1U << 9)
> +#define HINFC504_INTS_UE (1U << 6)
> +#define HINFC504_INTS_CE (1U << 5)
> +
> +#define HINFC504_INTCLR 0x2C
> +#define HINFC504_INTCLR_DMA (1U << 9)
> +#define HINFC504_INTCLR_UE (1U << 6)
> +#define HINFC504_INTCLR_CE (1U << 5)
> +
> +#define HINFC504_ECC_STATUS 0x5C
> +#define HINFC504_ECC_1_BIT_SHIFT 16
> +#define HINFC504_ECC_16_BIT_SHIFT 12
> +
> +#define HINFC504_DMA_CTRL 0x60
> +#define HINFC504_DMA_CTRL_DMA_START (1U << 0)
> +#define HINFC504_DMA_CTRL_WE (1U << 1)
> +#define HINFC504_DMA_CTRL_DATA_AREA_EN (1U << 2)
> +#define HINFC504_DMA_CTRL_OOB_AREA_EN (1U << 3)
> +#define HINFC504_DMA_CTRL_BURST4_EN (1U << 4)
> +#define HINFC504_DMA_CTRL_BURST8_EN (1U << 5)
> +#define HINFC504_DMA_CTRL_BURST16_EN (1U << 6)
> +#define HINFC504_DMA_CTRL_ADDR_NUM_SHIFT (7)
> +#define HINFC504_DMA_CTRL_ADDR_NUM_MASK (1)
> +#define HINFC504_DMA_CTRL_CS_SHIFT (8)
> +#define HINFC504_DMA_CTRL_CS_MASK (0x03)
> +
> +#define HINFC504_DMA_ADDR_DATA 0x64
> +#define HINFC504_DMA_ADDR_OOB 0x68
> +
> +#define HINFC504_DMA_LEN 0x6C
> +#define HINFC504_DMA_LEN_OOB_SHIFT (16)
> +#define HINFC504_DMA_LEN_OOB_MASK (0xFFF)
> +
> +#define HINFC504_DMA_PARA 0x70
> +#define HINFC504_DMA_PARA_DATA_RW_EN (1U << 0)
> +#define HINFC504_DMA_PARA_OOB_RW_EN (1U << 1)
> +#define HINFC504_DMA_PARA_DATA_EDC_EN (1U << 2)
> +#define HINFC504_DMA_PARA_OOB_EDC_EN (1U << 3)
> +#define HINFC504_DMA_PARA_DATA_ECC_EN (1U << 4)
> +#define HINFC504_DMA_PARA_OOB_ECC_EN (1U << 5)
> +
> +#define HINFC_VERSION 0x74
> +#define HINFC504_LOG_READ_ADDR 0x7C
> +#define HINFC504_LOG_READ_LEN 0x80
> +
> +#define HINFC504_NANDINFO_LEN 0x10
> +
> +struct hinfc_host {
> + struct nand_chip chip;
> + struct mtd_info mtd;
> + struct device *dev;
> + void __iomem *iobase;
> + struct completion cmd_complete;
> + unsigned int offset;
> + unsigned int command;
> + int chipselect;
> + unsigned int addr_cycle;
> + unsigned int addr_value[2];
It looks like you're using addr_value as 32-bit copies of the HW
register. Might make sense to declare them as u32, since you care about
the width.
> + unsigned int cache_addr_value[2];
> + char *buffer;
> + dma_addr_t dma_buffer;
> + dma_addr_t dma_oob;
> + int version;
> + unsigned int ecc_bits;
> + unsigned int irq_status; /* interrupt status */
> +};
> +
> +static inline unsigned int hinfc_read(struct hinfc_host *host, unsigned int reg)
> +{
> + return readl(host->iobase + reg);
> +}
> +
> +static inline void hinfc_write(struct hinfc_host *host, unsigned int value,
> + unsigned int reg)
> +{
> + writel(value, host->iobase + reg);
> +}
> +
> +static void wait_controller_finished(struct hinfc_host *host)
> +{
> + unsigned long timeout = jiffies + HINFC504_NFC_TIMEOUT;
> + int val;
> +
> + while (time_before(jiffies, timeout)) {
> + val = hinfc_read(host, HINFC504_STATUS);
> + if (host->command == NAND_CMD_ERASE2) {
> + /* nfc is ready */
> + while (!(val & HINFC504_READY)) {
> + usleep_range(500, 1000);
> + val = hinfc_read(host, HINFC504_STATUS);
> + }
> + return;
> + }
> +
> + if (val & HINFC504_READY)
> + return;
> + }
> +
> + /* wait cmd timeout */
> + dev_err(host->dev, "Wait NAND controller exec cmd timeout.\n");
> +}
> +
> +static void hisi_nfc_dma_transfer(struct hinfc_host *host, int todev)
> +{
> + struct mtd_info *mtd = &host->mtd;
> + struct nand_chip *chip = mtd->priv;
> + unsigned long val;
> + int ret;
> +
> + hinfc_write(host, host->dma_buffer, HINFC504_DMA_ADDR_DATA);
> + hinfc_write(host, host->dma_oob, HINFC504_DMA_ADDR_OOB);
> +
> + if (chip->ecc.mode == NAND_ECC_NONE) {
> + hinfc_write(host, ((mtd->oobsize & HINFC504_DMA_LEN_OOB_MASK)
> + << HINFC504_DMA_LEN_OOB_SHIFT), HINFC504_DMA_LEN);
> +
> + hinfc_write(host, HINFC504_DMA_PARA_DATA_RW_EN
> + | HINFC504_DMA_PARA_OOB_RW_EN, HINFC504_DMA_PARA);
> + } else {
> + hinfc_write(host, HINFC504_DMA_PARA_DATA_RW_EN
> + | HINFC504_DMA_PARA_OOB_RW_EN | HINFC504_DMA_PARA_DATA_EDC_EN
> + | HINFC504_DMA_PARA_OOB_EDC_EN | HINFC504_DMA_PARA_DATA_ECC_EN
> + | HINFC504_DMA_PARA_OOB_ECC_EN, HINFC504_DMA_PARA);
> + }
> +
> + val = (HINFC504_DMA_CTRL_DMA_START | HINFC504_DMA_CTRL_BURST4_EN
> + | HINFC504_DMA_CTRL_BURST8_EN | HINFC504_DMA_CTRL_BURST16_EN
> + | HINFC504_DMA_CTRL_DATA_AREA_EN | HINFC504_DMA_CTRL_OOB_AREA_EN
> + | ((host->addr_cycle == 4 ? 1 : 0)
> + << HINFC504_DMA_CTRL_ADDR_NUM_SHIFT)
> + | ((host->chipselect & HINFC504_DMA_CTRL_CS_MASK)
> + << HINFC504_DMA_CTRL_CS_SHIFT));
> +
> + if (todev)
> + val |= HINFC504_DMA_CTRL_WE;
> +
> + hinfc_write(host, val, HINFC504_DMA_CTRL);
> +
> + init_completion(&host->cmd_complete);
You need to run init_completion() *before* you kick off your I/O.
Otherwise, your interrupt handler is racing with this function.
> + ret = wait_for_completion_timeout(&host->cmd_complete,
> + HINFC504_NFC_DMA_TIMEOUT);
> +
> + if (!ret) {
> + dev_err(host->dev, "DMA operation(irq) timeout!\n");
> + /* sanity check */
> + val = hinfc_read(host, HINFC504_DMA_CTRL);
> + if (!(val & HINFC504_DMA_CTRL_DMA_START))
> + dev_err(host->dev, "dma is already done but without irq ACK!");
You're missing a newline at the end of this message. Please check your
other prints too.
Also, s/dma/DMA/
> + else
> + dev_err(host->dev, "dma is really timeout!");
> + }
> +}
> +
> +static int hisi_nfc_send_cmd_pageprog(struct hinfc_host *host)
> +{
> + host->addr_value[0] &= 0xffff0000;
> +
> + hinfc_write(host, host->addr_value[0], HINFC504_ADDRL);
> + hinfc_write(host, host->addr_value[1], HINFC504_ADDRH);
> + hinfc_write(host, NAND_CMD_PAGEPROG << 8 | NAND_CMD_SEQIN,
> + HINFC504_CMD);
> +
> + hisi_nfc_dma_transfer(host, 1);
> +
> + return 0;
> +}
> +
> +static int hisi_nfc_send_cmd_readstart(struct hinfc_host *host)
> +{
> + struct mtd_info *mtd = &host->mtd;
> +
> + if ((host->addr_value[0] == host->cache_addr_value[0]) &&
> + (host->addr_value[1] == host->cache_addr_value[1]))
> + return 0;
> +
> + host->addr_value[0] &= 0xffff0000;
> +
> + hinfc_write(host, host->addr_value[0], HINFC504_ADDRL);
> + hinfc_write(host, host->addr_value[1], HINFC504_ADDRH);
> + hinfc_write(host, NAND_CMD_READSTART << 8 | NAND_CMD_READ0,
> + HINFC504_CMD);
> +
> + hinfc_write(host, 0, HINFC504_LOG_READ_ADDR);
> + hinfc_write(host, mtd->writesize + mtd->oobsize,
> + HINFC504_LOG_READ_LEN);
> +
> + hisi_nfc_dma_transfer(host, 0);
> +
> + host->cache_addr_value[0] = host->addr_value[0];
> + host->cache_addr_value[1] = host->addr_value[1];
> +
> + return 0;
> +}
> +
> +static int hisi_nfc_send_cmd_erase(struct hinfc_host *host)
> +{
> + hinfc_write(host, host->addr_value[0], HINFC504_ADDRL);
> + hinfc_write(host, (NAND_CMD_ERASE2 << 8) | NAND_CMD_ERASE1,
> + HINFC504_CMD);
> +
> + hinfc_write(host, HINFC504_OP_WAIT_READY_EN
> + | HINFC504_OP_CMD2_EN
> + | HINFC504_OP_CMD1_EN
> + | HINFC504_OP_ADDR_EN
> + | ((host->chipselect & HINFC504_OP_NF_CS_MASK)
> + << HINFC504_OP_NF_CS_SHIFT)
> + | ((host->addr_cycle & HINFC504_OP_ADDR_CYCLE_MASK)
> + << HINFC504_OP_ADDR_CYCLE_SHIFT),
> + HINFC504_OP);
> +
> + wait_controller_finished(host);
> +
> + return 0;
> +}
> +
> +static int hisi_nfc_send_cmd_readid(struct hinfc_host *host)
> +{
> + hinfc_write(host, HINFC504_NANDINFO_LEN, HINFC504_DATA_NUM);
> + hinfc_write(host, NAND_CMD_READID, HINFC504_CMD);
> + hinfc_write(host, 0, HINFC504_ADDRL);
> +
> + hinfc_write(host, HINFC504_OP_CMD1_EN | HINFC504_OP_ADDR_EN
> + | HINFC504_OP_READ_DATA_EN
> + | ((host->chipselect & HINFC504_OP_NF_CS_MASK)
> + << HINFC504_OP_NF_CS_SHIFT)
> + | 1 << HINFC504_OP_ADDR_CYCLE_SHIFT, HINFC504_OP);
> +
> + wait_controller_finished(host);
> +
> + return 0;
> +}
> +
> +static int hisi_nfc_send_cmd_status(struct hinfc_host *host)
> +{
> + hinfc_write(host, HINFC504_NANDINFO_LEN, HINFC504_DATA_NUM);
> + hinfc_write(host, NAND_CMD_STATUS, HINFC504_CMD);
> + hinfc_write(host, HINFC504_OP_CMD1_EN
> + | HINFC504_OP_READ_DATA_EN
> + | ((host->chipselect & HINFC504_OP_NF_CS_MASK)
> + << HINFC504_OP_NF_CS_SHIFT),
> + HINFC504_OP);
> +
> + wait_controller_finished(host);
> +
> + return 0;
> +}
> +
> +static int hisi_nfc_send_cmd_reset(struct hinfc_host *host, int chipselect)
> +{
> + hinfc_write(host, NAND_CMD_RESET, HINFC504_CMD);
> +
> + hinfc_write(host, HINFC504_OP_CMD1_EN
> + | ((chipselect & HINFC504_OP_NF_CS_MASK)
> + << HINFC504_OP_NF_CS_SHIFT)
> + | HINFC504_OP_WAIT_READY_EN,
> + HINFC504_OP);
> +
> + wait_controller_finished(host);
> +
> + return 0;
> +}
> +
> +static void hisi_nfc_select_chip(struct mtd_info *mtd, int chipselect)
> +{
> + struct nand_chip *chip = mtd->priv;
> + struct hinfc_host *host = chip->priv;
> +
> + if (chipselect < 0)
> + return;
> +
> + host->chipselect = chipselect;
> +}
> +
> +static uint8_t hisi_nfc_read_byte(struct mtd_info *mtd)
> +{
> + struct nand_chip *chip = mtd->priv;
> + struct hinfc_host *host = chip->priv;
> +
> + if (host->command == NAND_CMD_STATUS)
> + return readb(chip->IO_ADDR_R);
> +
> + host->offset++;
> +
> + if (host->command == NAND_CMD_READID)
> + return readb(chip->IO_ADDR_R + host->offset - 1);
> +
> + return readb(host->buffer + host->offset - 1);
> +}
> +
> +static u16 hisi_nfc_read_word(struct mtd_info *mtd)
> +{
> + struct nand_chip *chip = mtd->priv;
> + struct hinfc_host *host = chip->priv;
> +
> + host->offset += 2;
> + return readw(host->buffer + host->offset - 2);
> +}
> +
> +static void
> +hisi_nfc_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
> +{
> + struct nand_chip *chip = mtd->priv;
> + struct hinfc_host *host = chip->priv;
> +
> + memcpy(host->buffer + host->offset, buf, len);
> + host->offset += len;
> +}
> +
> +static void hisi_nfc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
> +{
> + struct nand_chip *chip = mtd->priv;
> + struct hinfc_host *host = chip->priv;
> +
> + memcpy(buf, host->buffer + host->offset, len);
> + host->offset += len;
> +}
> +
> +static void set_addr(struct mtd_info *mtd, int column, int page_addr)
> +{
> + struct nand_chip *chip = mtd->priv;
> + struct hinfc_host *host = chip->priv;
> +
> + host->addr_cycle = 0;
> + host->addr_value[0] = 0;
> + host->addr_value[1] = 0;
> +
> + /* Serially input address */
> + if (column != -1) {
> + /* Adjust columns for 16 bit buswidth */
> + if (chip->options & NAND_BUSWIDTH_16)
> + column >>= 1;
It doesn't look like you're supporting ONFI parameter pages yet, but you
might consider checking for !nand_opcode_8bits(opcode) before adjusting the
address. We had to fix some other drivers for this recently.
> +
> + host->addr_value[0] = column & 0xffff;
> + host->addr_cycle = 2;
> + }
> + if (page_addr != -1) {
> + host->addr_value[0] |= (page_addr & 0xffff)
> + << (host->addr_cycle * 8);
> + host->addr_cycle += 2;
> + /* One more address cycle for devices > 128MiB */
> + if (chip->chipsize > (128 << 20)) {
> + host->addr_cycle += 1;
> + if (host->command == NAND_CMD_ERASE1)
> + host->addr_value[0] |= ((page_addr >> 16) & 0xff) << 16;
> + else
> + host->addr_value[1] |= ((page_addr >> 16) & 0xff);
> + }
> + }
> +}
> +
> +static void hisi_nfc_cmdfunc(struct mtd_info *mtd, unsigned command, int column,
> + int page_addr)
> +{
> + struct nand_chip *chip = mtd->priv;
> + struct hinfc_host *host = chip->priv;
> + int is_cache_invalid = 1;
> + unsigned int flag = 0;
> +
> + host->command = command;
> +
> + switch (command) {
> + case NAND_CMD_READ0:
> + case NAND_CMD_READOOB:
> + if (command == NAND_CMD_READ0)
> + host->offset = column;
> + else
> + host->offset = column + mtd->writesize;
> +
> + is_cache_invalid = 0;
> + set_addr(mtd, column, page_addr);
> + hisi_nfc_send_cmd_readstart(host);
> + break;
> +
> + case NAND_CMD_SEQIN:
> + host->offset = column;
> + set_addr(mtd, column, page_addr);
> + break;
> +
> + case NAND_CMD_ERASE1:
> + set_addr(mtd, column, page_addr);
> + break;
> +
> + case NAND_CMD_PAGEPROG:
> + hisi_nfc_send_cmd_pageprog(host);
> + break;
> +
> + case NAND_CMD_ERASE2:
> + hisi_nfc_send_cmd_erase(host);
> + break;
> +
> + case NAND_CMD_READID:
> + host->offset = column;
> + memset(chip->IO_ADDR_R, 0, 0x10);
> + hisi_nfc_send_cmd_readid(host);
> + break;
> +
> + case NAND_CMD_STATUS:
> + flag = hinfc_read(host, HINFC504_CON);
> + if (chip->ecc.mode == NAND_ECC_HW)
> + hinfc_write(host,
> + flag && ~(HINFC504_CON_ECCTYPE_MASK <<
> + HINFC504_CON_ECCTYPE_SHIFT), HINFC504_CON);
> +
> + host->offset = 0;
> + memset(chip->IO_ADDR_R, 0, 0x10);
> + hisi_nfc_send_cmd_status(host);
> + hinfc_write(host, flag, HINFC504_CON);
> + break;
> +
> + case NAND_CMD_RESET:
> + hisi_nfc_send_cmd_reset(host, host->chipselect);
> + break;
> +
> + default:
> + dev_err(host->dev, "Error: unsupported cmd(cmd=%x, col=%x, page=%x)\n",
> + command, column, page_addr);
> + }
> +
> + if (is_cache_invalid) {
> + host->cache_addr_value[0] = ~0;
> + host->cache_addr_value[1] = ~0;
> + }
> +}
> +
> +static irqreturn_t hinfc_irq_handle(int irq, void *devid)
> +{
> + struct hinfc_host *host = devid;
> + unsigned int flag;
> +
> + flag = hinfc_read(host, HINFC504_INTS);
> + /* store interrupts state */
> + host->irq_status |= flag;
> +
> + if (flag & HINFC504_INTS_DMA) {
> + hinfc_write(host, HINFC504_INTCLR_DMA, HINFC504_INTCLR);
> + complete(&host->cmd_complete);
> + } else if (flag & HINFC504_INTS_CE) {
> + hinfc_write(host, HINFC504_INTCLR_CE, HINFC504_INTCLR);
> + } else if (flag & HINFC504_INTS_UE) {
> + hinfc_write(host, HINFC504_INTCLR_UE, HINFC504_INTCLR);
> + }
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int hisi_nand_read_page_hwecc(struct mtd_info *mtd,
> + struct nand_chip *chip, uint8_t *buf, int oob_required, int page)
> +{
> + struct hinfc_host *host = chip->priv;
> + int max_bitflips = 0, stat = 0;
> +
> + chip->read_buf(mtd, buf, mtd->writesize);
> + chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
> +
> + /* errors which can not be corrected by ECC */
> + if (host->irq_status & HINFC504_INTS_UE) {
> + mtd->ecc_stats.failed++;
> + } else if (host->irq_status & HINFC504_INTS_CE) {
> + /* need add other ECC modes! */
> + switch (host->ecc_bits) {
> + case 1:
> + stat = hweight8(hinfc_read(host, HINFC504_ECC_STATUS)>>
> + HINFC504_ECC_1_BIT_SHIFT);
> + break;
> + case 6:
> + stat = hweight16(hinfc_read(host, HINFC504_ECC_STATUS)>>
> + HINFC504_ECC_16_BIT_SHIFT & 0x0fff);
> + }
> + mtd->ecc_stats.corrected += stat;
> + max_bitflips = max_t(unsigned int, max_bitflips, stat);
> + }
> + host->irq_status = 0;
> +
> + return max_bitflips;
> +}
> +
> +static int hisi_nand_write_page_hwecc(struct mtd_info *mtd,
> + struct nand_chip *chip, const uint8_t *buf, int oob_required)
> +{
> + chip->write_buf(mtd, buf, mtd->writesize);
> + if (oob_required)
> + chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
> +
> + return 0;
> +}
> +
> +static void hisi_nfc_host_init(struct hinfc_host *host)
> +{
> + struct nand_chip *chip = &host->chip;
> + unsigned int flag = 0;
> +
> + host->version = hinfc_read(host, HINFC_VERSION);
> + host->addr_cycle = 0;
> + host->addr_value[0] = 0;
> + host->addr_value[1] = 0;
> + host->cache_addr_value[0] = ~0;
> + host->cache_addr_value[1] = ~0;
> + host->chipselect = 0;
> +
> + /* default page size: 2K, ecc_none. need modify */
> + flag = HINFC504_CON_OP_MODE_NORMAL | HINFC504_CON_READY_BUSY_SEL
> + | ((0x001 & HINFC504_CON_PAGESIZE_MASK)
> + << HINFC504_CON_PAGEISZE_SHIFT)
> + | ((0x0 & HINFC504_CON_ECCTYPE_MASK)
> + << HINFC504_CON_ECCTYPE_SHIFT)
> + | ((chip->options & NAND_BUSWIDTH_16) ?
> + HINFC504_CON_BUS_WIDTH : 0);
> + hinfc_write(host, flag, HINFC504_CON);
> +
> + memset(chip->IO_ADDR_R, 0xff, HINFC504_BUFFER_BASE_ADDRESS_LEN);
> +
> + hinfc_write(host, SET_HINFC504_PWIDTH(HINFC504_W_LATCH,
> + HINFC504_R_LATCH, HINFC504_RW_LATCH), HINFC504_PWIDTH);
> +
> + /* enable dma irq */
> + hinfc_write(host, HINFC504_INTEN_DMA, HINFC504_INTEN);
> +}
> +
> +static struct nand_ecclayout nand_ecc_2K_1bit = {
> + .oobfree = { {24, 40} }
> +};
> +
> +static struct nand_ecclayout nand_ecc_2K_16bits = {
> + .oobavail = 6,
> + .oobfree = { {2, 6} },
> +};
> +
> +static int hisi_nfc_ecc_probe(struct hinfc_host *host)
> +{
> + struct nand_chip *chip = &host->chip;
> + unsigned int flag;
> +
> + chip->ecc.read_page = hisi_nand_read_page_hwecc;
> + chip->ecc.write_page = hisi_nand_write_page_hwecc;
> +
> + switch (host->ecc_bits) {
> + case 1:
> + chip->ecc.layout = &nand_ecc_2K_1bit;
> + chip->ecc.strength = 1;
> + chip->ecc.size = 512;
> + break;
> + case 6:
> + chip->ecc.layout = &nand_ecc_2K_16bits;
> + chip->ecc.strength = 16;
> + chip->ecc.size = 1024;
> + }
> +
> + flag = hinfc_read(host, HINFC504_CON);
> + /* add ecc type configure */
> + flag |= ((host->ecc_bits & HINFC504_CON_ECCTYPE_MASK)
> + << HINFC504_CON_ECCTYPE_SHIFT);
> + hinfc_write(host, flag, HINFC504_CON);
> +
> + /* enable ecc irq */
> + flag = hinfc_read(host, HINFC504_INTEN) & 0xfff;
> + hinfc_write(host, flag | HINFC504_INTEN_UE | HINFC504_INTEN_CE,
> + HINFC504_INTEN);
> +
> + return 0;
> +}
> +
> +static int hisi_nfc_probe(struct platform_device *pdev)
> +{
> + int ret = 0, irq, buswidth, flag, max_chips = HINFC504_MAX_CHIP;
> + struct device *dev = &pdev->dev;
> + struct hinfc_host *host;
> + struct nand_chip *chip;
> + struct mtd_info *mtd;
> + struct resource *res;
> + struct device_node *np = dev->of_node;
> + struct mtd_part_parser_data ppdata;
> +
> + host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
> + if (!host)
> + return -ENOMEM;
> + host->dev = dev;
> +
> + platform_set_drvdata(pdev, host);
> + chip = &host->chip;
> + mtd = &host->mtd;
> +
> + irq = platform_get_irq(pdev, 0);
> + if (irq < 0) {
> + dev_err(dev, "no IRQ resource defined\n");
> + ret = -ENXIO;
> + goto err_res;
> + }
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + host->iobase = devm_ioremap_resource(dev, res);
> + if (IS_ERR(host->iobase)) {
> + ret = PTR_ERR(host->iobase);
> + dev_err(dev, "devm_ioremap_resource[0] fail\n");
> + goto err_res;
> + }
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
> + chip->IO_ADDR_R = chip->IO_ADDR_W = devm_ioremap_resource(dev, res);
> + if (IS_ERR(chip->IO_ADDR_R)) {
> + ret = PTR_ERR(chip->IO_ADDR_R);
> + dev_err(dev, "devm_ioremap_resource[1] fail\n");
> + goto err_res;
> + }
> +
> + mtd->priv = chip;
> + mtd->owner = THIS_MODULE;
> + mtd->name = "hisi_nand";
> + mtd->dev.parent = &pdev->dev;
> +
> + chip->priv = host;
> + chip->cmdfunc = hisi_nfc_cmdfunc;
> + chip->select_chip = hisi_nfc_select_chip;
> + chip->read_byte = hisi_nfc_read_byte;
> + chip->read_word = hisi_nfc_read_word;
> + chip->write_buf = hisi_nfc_write_buf;
> + chip->read_buf = hisi_nfc_read_buf;
> + chip->chip_delay = HINFC504_CHIP_DELAY;
> +
> + chip->ecc.mode = of_get_nand_ecc_mode(np);
> + /* read ecc-bits from dts */
> + of_property_read_u32(np, "hisi,nand-ecc-bits", &host->ecc_bits);
Replace this with of_get_nand_ecc_step_size() and
of_get_nand_ecc_strength().
> + if (host->ecc_bits != 0 && host->ecc_bits != 1 && host->ecc_bits != 6) {
> + ret = -EINVAL;
> + dev_err(dev, "invalid nand-ecc-bits: %u\n", host->ecc_bits);
> + goto err_res;
> + }
> +
> + buswidth = of_get_nand_bus_width(np);
> + if (buswidth == 16)
> + chip->options |= NAND_BUSWIDTH_16;
> +
> + hisi_nfc_host_init(host);
> +
> + ret = devm_request_irq(dev, irq, hinfc_irq_handle, IRQF_DISABLED,
> + "nandc", host);
> + if (ret) {
> + dev_err(dev, "failed to request IRQ\n");
> + goto err_irq;
> + }
> +
> + ret = nand_scan_ident(mtd, max_chips, NULL);
> + if (ret) {
> + ret = -ENODEV;
> + goto err_ident;
> + }
> +
> + host->buffer = dma_alloc_coherent(dev, mtd->writesize + mtd->oobsize,
> + &host->dma_buffer, GFP_KERNEL);
Can you use dmam_alloc_coherent()? That will save you some of the
cleanup on error and removal paths.
> + if (!host->buffer) {
> + dev_err(dev, "Can't malloc memory for NAND driver.\n");
> + ret = -ENOMEM;
> + goto err_buf;
> + }
> + host->dma_oob = host->dma_buffer + mtd->writesize;
> + memset(host->buffer, 0xff, mtd->writesize + mtd->oobsize);
> +
> + flag = hinfc_read(host, HINFC504_CON);
> + flag &= ~(HINFC504_CON_PAGESIZE_MASK << HINFC504_CON_PAGEISZE_SHIFT);
> + switch (mtd->writesize) {
> + case 2048:
> + flag |= (0x001 << HINFC504_CON_PAGEISZE_SHIFT);
> + /* add more pagesize support
> + * default pagesize has been set in hisi_nfc_host_init
> + */
Does this mean you can't handle any other page size? You might want to
put the words 'TODO' or 'FIXME' in the comment, and you might want to
print an error and exit if you see some other value for mtd->writesize.
> + }
> + hinfc_write(host, flag, HINFC504_CON);
> +
> + if (chip->ecc.mode == NAND_ECC_HW)
> + hisi_nfc_ecc_probe(host);
> +
> + nand_scan_tail(mtd);
Please capture and handle the return value here.
> +
> + ppdata.of_node = np;
> + ret = mtd_device_parse_register(mtd, NULL, &ppdata, NULL, 0);
> + if (ret) {
> + dev_err(dev, "Err MTD partition=%d\n", ret);
> + goto err_mtd;
> + }
> +
> + return 0;
> +
> +err_mtd:
> + nand_release(mtd);
> +err_ident:
> +err_irq:
Do you really need these empty labels?
> +err_buf:
> + if (host->buffer)
> + dma_free_coherent(dev, mtd->writesize + mtd->oobsize,
> + host->buffer, host->dma_buffer);
This will go away.
> +err_res:
> + return ret;
> +}
> +
> +static int hisi_nfc_remove(struct platform_device *pdev)
> +{
> + struct hinfc_host *host = platform_get_drvdata(pdev);
> + struct mtd_info *mtd = &host->mtd;
> +
> + nand_release(mtd);
> + dma_free_coherent(&pdev->dev, mtd->writesize + mtd->oobsize,
> + host->buffer, host->dma_buffer);
Same here.
> +
> + return 0;
> +}
> +
> +#ifdef CONFIG_PM_SLEEP
> +static int hisi_nfc_suspend(struct platform_device *pdev,
> + pm_message_t state)
> +{
> + struct hinfc_host *host = platform_get_drvdata(pdev);
> +
> + while ((hinfc_read(host, HINFC504_STATUS) & 0x1) == 0x0)
> + ;
> +
> + while ((hinfc_read(host, HINFC504_DMA_CTRL))
> + & HINFC504_DMA_CTRL_DMA_START)
> + _cond_resched();
It's probably best if these don't spin forever. Can you implement a
timeout, and return an error on failure?
> +
> + return 0;
> +}
> +
> +static int hisi_nfc_resume(struct platform_device *pdev)
> +{
> + int cs;
> + struct hinfc_host *host = platform_get_drvdata(pdev);
> + struct nand_chip *chip = &host->chip;
> +
> + for (cs = 0; cs < chip->numchips; cs++)
> + hisi_nfc_send_cmd_reset(host, cs);
> + hinfc_write(host, SET_HINFC504_PWIDTH(HINFC504_W_LATCH,
> + HINFC504_R_LATCH, HINFC504_RW_LATCH), HINFC504_PWIDTH);
> +
> + return 0;
> +}
> +#endif
> +static SIMPLE_DEV_PM_OPS(hisi_nfc_pm_ops, hisi_nfc_suspend, hisi_nfc_resume);
> +
> +static const struct of_device_id nfc_id_table[] = {
> + { .compatible = "hisilicon,504-nfc" },
> + {}
> +};
> +MODULE_DEVICE_TABLE(of, nfc_id_table);
> +
> +static struct platform_driver hisi_nfc_driver = {
> + .driver = {
> + .name = "hisi_nand",
> + .of_match_table = of_match_ptr(nfc_id_table),
> + .pm = &hisi_nfc_pm_ops,
> + },
> + .probe = hisi_nfc_probe,
> + .remove = hisi_nfc_remove,
> +};
> +
> +module_platform_driver(hisi_nfc_driver);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Zhiyong Cai");
> +MODULE_AUTHOR("Zhou Wang");
> +MODULE_DESCRIPTION("Hisilicon Nand Flash Controller Driver");
Brian
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