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Message-ID: <20160308153810.43db903b@bbrezillon>
Date: Tue, 8 Mar 2016 15:38:10 +0100
From: Boris Brezillon <boris.brezillon@...e-electrons.com>
To: Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com>
Cc: <dwmw2@...radead.org>, <computersforpeace@...il.com>,
<geert@...ux-m68k.org>, <michals@...inx.com>,
<wangzhou1@...ilicon.com>, <f.fainelli@...il.com>, <gsi@...x.de>,
<andriy.shevchenko@...ux.intel.com>, <haokexin@...il.com>,
<rogerq@...com>, kpc528@...il.com,
Punnaiah Choudary Kalluri <punnaia@...inx.com>,
linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
kalluripunnaiahchoudary@...il.com
Subject: Re: [PATCH v5 2/3] mtd: nand: Add support for Arasan Nand Flash
Controller
Hi Punnaiah,
Sorry for the late review.
On Sat, 21 Nov 2015 20:09:48 +0530
Punnaiah Choudary Kalluri <punnaiah.choudary.kalluri@...inx.com> wrote:
> Added the basic driver for Arasan Nand Flash Controller used in
> Zynq UltraScale+ MPSoC. It supports only Hw Ecc and upto 24bit
> correction.
>
> Signed-off-by: Punnaiah Choudary Kalluri <punnaia@...inx.com>
> ---
> Changes in v5:
> - Renamed the driver filei as arasan_nand.c
> - Fixed all comments relaqted coding style
> - Fixed comments related to propagating the errors
> - Modified the anfc_write_page_hwecc as per the write_page
> prototype
> Changes in v4:
> - Added support for onfi timing mode configuration
> - Added clock supppport
> - Added support for multiple chipselects
> Changes in v3:
> - Removed unused variables
> - Avoided busy loop and used jifies based implementation
> - Fixed compiler warnings "right shift count >= width of type"
> - Removed unneeded codei and improved error reporting
> - Added onfi version check to ensure reading the valid address cycles
> Changes in v2:
> - Added missing of.h to avoid kbuild system report error
> ---
> drivers/mtd/nand/Kconfig | 6 +
> drivers/mtd/nand/Makefile | 1 +
> drivers/mtd/nand/arasan_nand.c | 1010 ++++++++++++++++++++++++++++++++++++++++
> 3 files changed, 1017 insertions(+)
> create mode 100644 drivers/mtd/nand/arasan_nand.c
>
> diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig
> index 2896640..9c620fb 100644
> --- a/drivers/mtd/nand/Kconfig
> +++ b/drivers/mtd/nand/Kconfig
> @@ -546,4 +546,10 @@ config MTD_NAND_HISI504
> help
> Enables support for NAND controller on Hisilicon SoC Hip04.
>
> +config MTD_NAND_ARASAN
> + tristate "Support for Arasan Nand Flash controller"
> + help
> + Enables the driver for the Arasan Nand Flash controller on
> + Zynq UltraScale+ MPSoC.
> +
> endif # MTD_NAND
> diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile
> index 2c7f014..3b993cb 100644
> --- a/drivers/mtd/nand/Makefile
> +++ b/drivers/mtd/nand/Makefile
> @@ -55,5 +55,6 @@ obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH) += bcm47xxnflash/
> obj-$(CONFIG_MTD_NAND_SUNXI) += sunxi_nand.o
> obj-$(CONFIG_MTD_NAND_HISI504) += hisi504_nand.o
> obj-$(CONFIG_MTD_NAND_BRCMNAND) += brcmnand/
> +obj-$(CONFIG_MTD_NAND_ARASAN) += arasan_nand.o
>
> nand-objs := nand_base.o nand_bbt.o nand_timings.o
> diff --git a/drivers/mtd/nand/arasan_nand.c b/drivers/mtd/nand/arasan_nand.c
> new file mode 100644
> index 0000000..e882e63
> --- /dev/null
> +++ b/drivers/mtd/nand/arasan_nand.c
> @@ -0,0 +1,1010 @@
> +/*
> + * Arasan Nand Flash Controller Driver
> + *
> + * Copyright (C) 2014 - 2015 Xilinx, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify it under
> + * the terms of the GNU General Public License version 2 as published by the
> + * Free Software Foundation; either version 2 of the License, or (at your
> + * option) any later version.
> + */
> +#include <linux/clk.h>
> +#include <linux/delay.h>
> +#include <linux/dma-mapping.h>
> +#include <linux/interrupt.h>
> +#include <linux/io-64-nonatomic-lo-hi.h>
> +#include <linux/module.h>
> +#include <linux/mtd/mtd.h>
> +#include <linux/mtd/nand.h>
> +#include <linux/mtd/partitions.h>
> +#include <linux/of.h>
> +#include <linux/of_mtd.h>
> +#include <linux/platform_device.h>
> +
> +#define DRIVER_NAME "arasan_nand"
> +#define EVNT_TIMEOUT 1000
> +#define STATUS_TIMEOUT 2000
> +
> +#define PKT_OFST 0x00
> +#define MEM_ADDR1_OFST 0x04
> +#define MEM_ADDR2_OFST 0x08
> +#define CMD_OFST 0x0C
> +#define PROG_OFST 0x10
> +#define INTR_STS_EN_OFST 0x14
> +#define INTR_SIG_EN_OFST 0x18
> +#define INTR_STS_OFST 0x1C
> +#define READY_STS_OFST 0x20
> +#define DMA_ADDR1_OFST 0x24
> +#define FLASH_STS_OFST 0x28
> +#define DATA_PORT_OFST 0x30
> +#define ECC_OFST 0x34
> +#define ECC_ERR_CNT_OFST 0x38
> +#define ECC_SPR_CMD_OFST 0x3C
> +#define ECC_ERR_CNT_1BIT_OFST 0x40
> +#define ECC_ERR_CNT_2BIT_OFST 0x44
> +#define DMA_ADDR0_OFST 0x50
> +#define DATA_INTERFACE_REG 0x6C
> +
> +#define PKT_CNT_SHIFT 12
> +
> +#define ECC_ENABLE BIT(31)
> +#define DMA_EN_MASK GENMASK(27, 26)
> +#define DMA_ENABLE 0x2
> +#define DMA_EN_SHIFT 26
> +#define REG_PAGE_SIZE_MASK GENMASK(25, 23)
> +#define REG_PAGE_SIZE_SHIFT 23
> +#define REG_PAGE_SIZE_512 0
> +#define REG_PAGE_SIZE_1K 5
> +#define REG_PAGE_SIZE_2K 1
> +#define REG_PAGE_SIZE_4K 2
> +#define REG_PAGE_SIZE_8K 3
> +#define REG_PAGE_SIZE_16K 4
> +#define CMD2_SHIFT 8
> +#define ADDR_CYCLES_SHIFT 28
> +
> +#define XFER_COMPLETE BIT(2)
> +#define READ_READY BIT(1)
> +#define WRITE_READY BIT(0)
> +#define MBIT_ERROR BIT(3)
> +#define ERR_INTRPT BIT(4)
> +
> +#define PROG_PGRD BIT(0)
> +#define PROG_ERASE BIT(2)
> +#define PROG_STATUS BIT(3)
> +#define PROG_PGPROG BIT(4)
> +#define PROG_RDID BIT(6)
> +#define PROG_RDPARAM BIT(7)
> +#define PROG_RST BIT(8)
> +#define PROG_GET_FEATURE BIT(9)
> +#define PROG_SET_FEATURE BIT(10)
> +
> +#define ONFI_STATUS_FAIL BIT(0)
> +#define ONFI_STATUS_READY BIT(6)
> +
> +#define PG_ADDR_SHIFT 16
> +#define BCH_MODE_SHIFT 25
> +#define BCH_EN_SHIFT 27
> +#define ECC_SIZE_SHIFT 16
> +
> +#define MEM_ADDR_MASK GENMASK(7, 0)
> +#define BCH_MODE_MASK GENMASK(27, 25)
> +
> +#define CS_MASK GENMASK(31, 30)
> +#define CS_SHIFT 30
> +
> +#define PAGE_ERR_CNT_MASK GENMASK(16, 8)
> +#define PKT_ERR_CNT_MASK GENMASK(7, 0)
> +
> +#define NVDDR_MODE BIT(9)
> +#define NVDDR_TIMING_MODE_SHIFT 3
> +
> +#define ONFI_ID_LEN 8
> +#define TEMP_BUF_SIZE 512
> +#define NVDDR_MODE_PACKET_SIZE 8
> +#define SDR_MODE_PACKET_SIZE 4
> +
> +/**
> + * struct anfc_ecc_matrix - Defines ecc information storage format
> + * @pagesize: Page size in bytes.
> + * @codeword_size: Code word size information.
> + * @eccbits: Number of ecc bits.
> + * @bch: Bch / Hamming mode enable/disable.
> + * @eccsize: Ecc size information.
> + */
> +struct anfc_ecc_matrix {
> + u32 pagesize;
> + u32 codeword_size;
> + u8 eccbits;
> + u8 bch;
> + u16 eccsize;
> +};
> +
> +static const struct anfc_ecc_matrix ecc_matrix[] = {
> + {512, 512, 1, 0, 0x3},
> + {512, 512, 4, 1, 0x7},
> + {512, 512, 8, 1, 0xD},
> + /* 2K byte page */
> + {2048, 512, 1, 0, 0xC},
> + {2048, 512, 4, 1, 0x1A},
> + {2048, 512, 8, 1, 0x34},
> + {2048, 512, 12, 1, 0x4E},
> + {2048, 1024, 24, 1, 0x54},
> + /* 4K byte page */
> + {4096, 512, 1, 0, 0x18},
> + {4096, 512, 4, 1, 0x34},
> + {4096, 512, 8, 1, 0x68},
> + {4096, 512, 12, 1, 0x9C},
> + {4096, 1024, 4, 1, 0xA8},
> + /* 8K byte page */
> + {8192, 512, 1, 0, 0x30},
> + {8192, 512, 4, 1, 0x68},
> + {8192, 512, 8, 1, 0xD0},
> + {8192, 512, 12, 1, 0x138},
> + {8192, 1024, 24, 1, 0x150},
> + /* 16K byte page */
> + {16384, 512, 1, 0, 0x60},
> + {16384, 512, 4, 1, 0xD0},
> + {16384, 512, 8, 1, 0x1A0},
> + {16384, 512, 12, 1, 0x270},
> + {16384, 1024, 24, 1, 0x2A0}
> +};
Do you really need this association table. IMO, those are
information you could deduce from nand_chip info (ecc_strength,
ecc_step_size, ...). eccsize can be calculated this way:
info->pagesize = mtd->writesize;
info->codeword_size = chip->ecc_step_ds;
info->eccbits = chip->ecc_strength_ds;
if (info->eccbits > 1)
info->bch = true;
steps = info->pagesize / info->codeword_size;
if (!bch)
info->eccsize = 3 * steps;
else
info->eccsize =
DIV_ROUND_UP(fls(8 * info->codeword_size) *
ecc->strength * steps, 8);
And, too bad we have to deal with another engine operating at the bit
level instead of aligning each ECC step to the next byte (GPMI engine
does that too, and it's a pain to deal with).
> +
> +/**
> + * struct anfc - Defines the Arasan NAND flash driver instance
> + * @chip: NAND chip information structure.
> + * @mtd: MTD information structure.
> + * @dev: Pointer to the device structure.
> + * @base: Virtual address of the NAND flash device.
> + * @curr_cmd: Current command issued.
> + * @clk_sys: Pointer to the system clock.
> + * @clk_flash: Pointer to the flash clock.
> + * @dma: Dma enable/disable.
> + * @bch: Bch / Hamming mode enable/disable.
> + * @err: Error identifier.
> + * @iswriteoob: Identifies if oob write operation is required.
> + * @buf: Buffer used for read/write byte operations.
> + * @raddr_cycles: Row address cycle information.
> + * @caddr_cycles: Column address cycle information.
> + * @irq: irq number
> + * @pktsize: Packet size for read / write operation.
> + * @bufshift: Variable used for indexing buffer operation
> + * @rdintrmask: Interrupt mask value for read operation.
> + * @num_cs: Number of chip selects in use.
> + * @spktsize: Packet size in ddr mode for status operation.
> + * @bufrdy: Completion event for buffer ready.
> + * @xfercomp: Completion event for transfer complete.
> + * @ecclayout: Ecc layout object
> + */
> +struct anfc {
> + struct nand_chip chip;
> + struct mtd_info mtd;
Drop this field ^ . It's now directly embedded in nand_chip and can be
accessed with nand_to_mtd().
> + struct device *dev;
> +
> + void __iomem *base;
> + int curr_cmd;
> + struct clk *clk_sys;
> + struct clk *clk_flash;
> +
> + bool dma;
> + bool bch;
> + bool err;
> + bool iswriteoob;
> +
> + u8 buf[TEMP_BUF_SIZE];
> +
> + u16 raddr_cycles;
> + u16 caddr_cycles;
> +
> + u32 irq;
> + u32 pktsize;
> + u32 bufshift;
> + u32 rdintrmask;
> + u32 num_cs;
> + u32 spktsize;
> +
> + struct completion bufrdy;
> + struct completion xfercomp;
I'm pretty sure you don't need 2 different completion fields. You can
do the same thing with a single one and a different approach (see here
[2]).
> + struct nand_ecclayout ecclayout;
As pointed by Brian, you probably start using the mtd_ooblayout_ops
approach, which should normally reach mainline before this driver.
> +};
As many other NAND controller drivers do, it seems your mixing the NAND
controller and NAND chip concept.
Could you create and anand struct containing the nand_chip field and
every other fields that are chip specific, and keep the controller
specific data in this anfc struct?
Note that the anand and anfc struct can be like together through the
chip->controller field (you can have a look at the sunxi_nand driver as
a reference).
> +
> +static inline struct anfc *to_anfc(struct mtd_info *mtd)
> +{
> + return container_of(mtd, struct anfc, mtd);
> +}
This should be adapted accordingly.
> +
> +static u8 anfc_page(u32 pagesize)
> +{
> + switch (pagesize) {
> + case 512:
> + return REG_PAGE_SIZE_512;
> + case 1024:
> + return REG_PAGE_SIZE_1K;
> + case 2048:
> + return REG_PAGE_SIZE_2K;
> + case 4096:
> + return REG_PAGE_SIZE_4K;
> + case 8192:
> + return REG_PAGE_SIZE_8K;
> + case 16384:
> + return REG_PAGE_SIZE_16K;
> + default:
> + break;
> + }
> +
> + return 0;
> +}
> +
> +static inline void anfc_enable_intrs(struct anfc *nfc, u32 val)
> +{
> + writel(val, nfc->base + INTR_STS_EN_OFST);
> + writel(val, nfc->base + INTR_SIG_EN_OFST);
> +}
> +
> +static int anfc_wait_for_event(struct anfc *nfc, u32 event)
> +{
> + struct completion *comp;
> +
> + if (event == XFER_COMPLETE)
> + comp = &nfc->xfercomp;
> + else
> + comp = &nfc->bufrdy;
> +
As said previously, I doubt you need 2 different completion objects.
And you should probably enable interrupts directly inside this function.
> + return wait_for_completion_timeout(comp,
> + msecs_to_jiffies(EVNT_TIMEOUT));
> +}
> +
> +static inline void anfc_setpktszcnt(struct anfc *nfc, u32 pktsize,
> + u32 pktcount)
> +{
> + writel(pktsize | (pktcount << PKT_CNT_SHIFT), nfc->base + PKT_OFST);
> +}
> +
> +static inline void anfc_set_eccsparecmd(struct anfc *nfc, u8 cmd1, u8 cmd2)
> +{
> + writel(cmd1 | (cmd2 << CMD2_SHIFT) |
> + (nfc->caddr_cycles << ADDR_CYCLES_SHIFT),
> + nfc->base + ECC_SPR_CMD_OFST);
> +}
> +
> +static void anfc_setpagecoladdr(struct anfc *nfc, u32 page, u16 col)
> +{
> + u32 val;
> +
> + writel(col | (page << PG_ADDR_SHIFT), nfc->base + MEM_ADDR1_OFST);
> +
> + val = readl(nfc->base + MEM_ADDR2_OFST);
> + val = (val & ~MEM_ADDR_MASK) |
> + ((page >> PG_ADDR_SHIFT) & MEM_ADDR_MASK);
> + writel(val, nfc->base + MEM_ADDR2_OFST);
> +}
> +
> +static void anfc_prepare_cmd(struct anfc *nfc, u8 cmd1, u8 cmd2,
> + u8 dmamode, u32 pagesize, u8 addrcycles)
> +{
> + u32 regval;
> +
> + regval = cmd1 | (cmd2 << CMD2_SHIFT);
> + if (dmamode && nfc->dma)
> + regval |= DMA_ENABLE << DMA_EN_SHIFT;
> + if (addrcycles)
> + regval |= addrcycles << ADDR_CYCLES_SHIFT;
> + if (pagesize)
> + regval |= anfc_page(pagesize) << REG_PAGE_SIZE_SHIFT;
> + writel(regval, nfc->base + CMD_OFST);
> +}
> +
> +static int anfc_device_ready(struct mtd_info *mtd,
> + struct nand_chip *chip)
You named the function anfc_device_ready() while it"s actually
implementing ->waitfunc. Could you rename it to anfc_waitfunc() to
avoid confusion.
> +{
> + u8 status;
> + unsigned long timeout = jiffies + STATUS_TIMEOUT;
> + struct anfc *nfc = to_anfc(mtd);
> +
> + do {
> + chip->cmdfunc(mtd, NAND_CMD_STATUS, 0, 0);
> + status = chip->read_byte(mtd);
> + if (status & ONFI_STATUS_READY)
> + break;
> + cpu_relax();
> + } while (!time_after_eq(jiffies, timeout));
> +
> + if (status & ONFI_STATUS_FAIL)
> + return NAND_STATUS_FAIL;
> +
> + if (time_after_eq(jiffies, timeout)) {
> + dev_err(nfc->dev, "%s timed out\n", __func__);
> + return -ETIMEDOUT;
> + }
> +
> + return 0;
> +}
It seems you're re-implementing nand_wait() [1]. Maybe it's worth
exporting this function instead of re-implementing it.
> +
> +static int anfc_read_oob(struct mtd_info *mtd, struct nand_chip *chip,
> + int page)
> +{
> + struct anfc *nfc = to_anfc(mtd);
> +
> + chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
> + if (nfc->dma)
> + nfc->rdintrmask = XFER_COMPLETE;
> + else
> + nfc->rdintrmask = READ_READY;
->rdintrmask assignment should be moved into ->read_buf()
implementation IMO.
> + chip->read_buf(mtd, chip->oob_poi, mtd->oobsize);
> +
> + return 0;
> +}
> +
> +static int anfc_write_oob(struct mtd_info *mtd, struct nand_chip *chip,
> + int page)
> +{
> + struct anfc *nfc = to_anfc(mtd);
> +
> + nfc->iswriteoob = true;
> + chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize, page);
> + chip->write_buf(mtd, chip->oob_poi, mtd->oobsize);
> + nfc->iswriteoob = false;
> +
> + return 0;
> +}
> +
> +static void anfc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
> +{
> + u32 pktcount, pktsize;
> + unsigned int buf_rd_cnt = 0;
> + u32 *bufptr = (u32 *)buf;
> + struct anfc *nfc = to_anfc(mtd);
> + dma_addr_t paddr;
> +
> + if (nfc->curr_cmd == NAND_CMD_READ0) {
> + pktsize = nfc->pktsize;
> + pktcount = DIV_ROUND_UP(mtd->writesize, pktsize);
> + } else {
> + pktsize = len;
> + pktcount = 1;
> + }
Can we avoid making this selection conditional on the READ0 cmd?
I've worked with some NANDs that required accessing specific features
using a vendor-specific command + a READ command, and I'm not sure we
want to use this pktsize optimization in this case.
Maybe you should set the pktsize info in your ecc->read_page()
implementation (of course this means you'll have to reset it to 1
before leaving ->read_page()), and just calculate pktcount here.
> +
> + anfc_setpktszcnt(nfc, pktsize, pktcount);
> +
> + if (nfc->dma) {
> + paddr = dma_map_single(nfc->dev, buf, len, DMA_FROM_DEVICE);
What if buf has been vmallocated, and len is more than PAGE_SIZE (or
buf is not page aligned, and buf + len cross a page boundary).
I proposed a generic approach to deal with that [3], but if you only
support physically contiguous buffers, then you should make sure buf
was not vmallocated (using is_vmalloc_addr()).
> + if (dma_mapping_error(nfc->dev, paddr)) {
> + dev_err(nfc->dev, "Read buffer mapping error");
> + return;
> + }
> + lo_hi_writeq(paddr, nfc->base + DMA_ADDR0_OFST);
> + anfc_enable_intrs(nfc, nfc->rdintrmask);
> + writel(PROG_PGRD, nfc->base + PROG_OFST);
> + anfc_wait_for_event(nfc, XFER_COMPLETE);
> + dma_unmap_single(nfc->dev, paddr, len, DMA_FROM_DEVICE);
> + return;
> + }
> +
> + anfc_enable_intrs(nfc, nfc->rdintrmask);
> + writel(PROG_PGRD, nfc->base + PROG_OFST);
> +
> + while (buf_rd_cnt < pktcount) {
> +
> + anfc_wait_for_event(nfc, READ_READY);
> + buf_rd_cnt++;
> +
> + if (buf_rd_cnt == pktcount)
> + anfc_enable_intrs(nfc, XFER_COMPLETE);
> +
> + readsl(nfc->base + DATA_PORT_OFST, bufptr, pktsize/4);
> + bufptr += pktsize/4;
> +
> + if (buf_rd_cnt < pktcount)
> + anfc_enable_intrs(nfc, nfc->rdintrmask);
> + }
> +
> + anfc_wait_for_event(nfc, XFER_COMPLETE);
Hm, this looks like a complicated way of doing what you want. How about
changing for the following logic?
for (buf_rd_cnt = 0; buf_rd_cnt < pktcount; buf_rd_cnt)
{
anfc_wait_for_event(nfc, READ_READY);
readsl(nfc->base + DATA_PORT_OFST, bufptr, pktsize/4);
bufptr += pktsize/4;
}
anfc_wait_for_event(nfc, XFER_COMPLETE);
This implementation suppose you've moved interrupt activation in
anfc_wait_for_event().
> +}
> +
> +static void anfc_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
> +{
> + u32 pktcount, pktsize;
> + unsigned int buf_wr_cnt = 0;
> + u32 *bufptr = (u32 *)buf;
> + struct anfc *nfc = to_anfc(mtd);
> + dma_addr_t paddr;
> +
> + if (nfc->iswriteoob) {
> + pktsize = len;
> + pktcount = 1;
> + } else {
> + pktsize = nfc->pktsize;
> + pktcount = mtd->writesize / pktsize;
> + }
Same remark as for read_buf(). pktsize should probably be set to
nfc->pktsize in ecc->write_page() implem, and reset to 1 before leaving
the function.
> +
> + anfc_setpktszcnt(nfc, pktsize, pktcount);
> +
> + if (nfc->dma) {
> + paddr = dma_map_single(nfc->dev, (void *)buf, len,
> + DMA_TO_DEVICE);
> + if (dma_mapping_error(nfc->dev, paddr)) {
> + dev_err(nfc->dev, "Write buffer mapping error");
> + return;
> + }
> + lo_hi_writeq(paddr, nfc->base + DMA_ADDR0_OFST);
> + anfc_enable_intrs(nfc, XFER_COMPLETE);
> + writel(PROG_PGPROG, nfc->base + PROG_OFST);
> + anfc_wait_for_event(nfc, XFER_COMPLETE);
> + dma_unmap_single(nfc->dev, paddr, len, DMA_TO_DEVICE);
> + return;
> + }
> +
> + anfc_enable_intrs(nfc, WRITE_READY);
> + writel(PROG_PGPROG, nfc->base + PROG_OFST);
> +
> + while (buf_wr_cnt < pktcount) {
> + anfc_wait_for_event(nfc, WRITE_READY);
> +
> + buf_wr_cnt++;
> + if (buf_wr_cnt == pktcount)
> + anfc_enable_intrs(nfc, XFER_COMPLETE);
> +
> + writesl(nfc->base + DATA_PORT_OFST, bufptr, pktsize/4);
> + bufptr += pktsize/4;
> +
> + if (buf_wr_cnt < pktcount)
> + anfc_enable_intrs(nfc, WRITE_READY);
> + }
> +
> + anfc_wait_for_event(nfc, XFER_COMPLETE);
And the same goes for the other comments I made on ->read_buf().
> +}
> +
> +static int anfc_read_page_hwecc(struct mtd_info *mtd,
> + struct nand_chip *chip, uint8_t *buf,
> + int oob_required, int page)
> +{
> + u32 val;
> + struct anfc *nfc = to_anfc(mtd);
> +
> + anfc_set_eccsparecmd(nfc, NAND_CMD_RNDOUT, NAND_CMD_RNDOUTSTART);
> +
> + val = readl(nfc->base + CMD_OFST);
> + val = val | ECC_ENABLE;
> + writel(val, nfc->base + CMD_OFST);
> +
> + if (nfc->dma)
> + nfc->rdintrmask = XFER_COMPLETE;
> + else
> + nfc->rdintrmask = READ_READY;
> +
> + if (!nfc->bch)
> + nfc->rdintrmask = MBIT_ERROR;
> +
> + chip->read_buf(mtd, buf, mtd->writesize);
> +
> + val = readl(nfc->base + ECC_ERR_CNT_OFST);
> + if (nfc->bch) {
> + mtd->ecc_stats.corrected += val & PAGE_ERR_CNT_MASK;
> + } else {
> + val = readl(nfc->base + ECC_ERR_CNT_1BIT_OFST);
> + mtd->ecc_stats.corrected += val;
> + val = readl(nfc->base + ECC_ERR_CNT_2BIT_OFST);
> + mtd->ecc_stats.failed += val;
> + /* Clear ecc error count register 1Bit, 2Bit */
> + writel(0x0, nfc->base + ECC_ERR_CNT_1BIT_OFST);
> + writel(0x0, nfc->base + ECC_ERR_CNT_2BIT_OFST);
> + }
Not sure if your controller already handles the 'bitflips in erased
pages' case, but you might want to have a look at the
nand_check_erased_ecc_chunk() [4] function if that's not the case.
> + nfc->err = false;
> +
> + if (oob_required)
> + chip->ecc.read_oob(mtd, chip, page);
You should disable the ECC engine before leaving the function.
> +
> + return 0;
> +}
> +
> +static int anfc_write_page_hwecc(struct mtd_info *mtd,
> + struct nand_chip *chip, const uint8_t *buf,
> + int oob_required, int page)
> +{
> + u32 val;
> + unsigned int i;
> + struct anfc *nfc = to_anfc(mtd);
> + uint8_t *ecc_calc = chip->buffers->ecccalc;
> + uint32_t *eccpos = chip->ecc.layout->eccpos;
> +
> + anfc_set_eccsparecmd(nfc, NAND_CMD_RNDIN, 0);
> +
> + val = readl(nfc->base + CMD_OFST);
> + val = val | ECC_ENABLE;
> + writel(val, nfc->base + CMD_OFST);
> +
> + chip->write_buf(mtd, buf, mtd->writesize);
> +
> + if (oob_required) {
> + anfc_device_ready(mtd, chip);
> + chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page);
> + if (nfc->dma)
> + nfc->rdintrmask = XFER_COMPLETE;
> + else
> + nfc->rdintrmask = READ_READY;
> + chip->read_buf(mtd, ecc_calc, mtd->oobsize);
> + for (i = 0; i < chip->ecc.total; i++)
> + chip->oob_poi[eccpos[i]] = ecc_calc[eccpos[i]];
> + chip->ecc.write_oob(mtd, chip, page);
> + }
> +
Ditto.
> + return 0;
> +}
> +
> +static u8 anfc_read_byte(struct mtd_info *mtd)
> +{
> + struct anfc *nfc = to_anfc(mtd);
> +
> + return nfc->buf[nfc->bufshift++];
->read_byte() should normally be a wrapper around ->read_buf(), because
you don't know ahead of time, how many time ->read_byte() will be
called after the CMD/ADDR cycles, and thus cannot deduce how much
should be put in the temporary buffer.
So I'd suggest you put the logic to fill nfc->buf[] directly in there
instead of putting it in ->cmdfunc().
> +}
> +
> +static void anfc_writefifo(struct anfc *nfc, u32 prog, u32 size, u8 *buf)
> +{
> + u32 *bufptr = (u32 *)buf;
> +
> + anfc_enable_intrs(nfc, WRITE_READY);
> +
> + writel(prog, nfc->base + PROG_OFST);
> + anfc_wait_for_event(nfc, WRITE_READY);
> +
> + anfc_enable_intrs(nfc, XFER_COMPLETE);
> + writesl(nfc->base + DATA_PORT_OFST, bufptr, size/4);
> + anfc_wait_for_event(nfc, XFER_COMPLETE);
> +}
> +
> +static void anfc_readfifo(struct anfc *nfc, u32 prog, u32 size)
> +{
> + u32 *bufptr = (u32 *)nfc->buf;
> +
> + anfc_enable_intrs(nfc, READ_READY);
> +
> + writel(prog, nfc->base + PROG_OFST);
> + anfc_wait_for_event(nfc, READ_READY);
> +
> + anfc_enable_intrs(nfc, XFER_COMPLETE);
> + readsl(nfc->base + DATA_PORT_OFST, bufptr, size/4);
> + anfc_wait_for_event(nfc, XFER_COMPLETE);
> +}
If you do what I suggest, you shouldn't need those
anfc_writefifo/readfifo() functions (or at least, not in their current
form).
> +
> +static int anfc_ecc_init(struct mtd_info *mtd,
> + struct nand_ecc_ctrl *ecc)
> +{
> + u32 ecc_addr, regval;
> + unsigned int bchmode = 0, i, oob_index;
> + struct nand_chip *nand_chip = mtd->priv;
> + struct anfc *nfc = to_anfc(mtd);
> + int found = -1;
> +
> + nand_chip->ecc.mode = NAND_ECC_HW;
> + nand_chip->ecc.read_page = anfc_read_page_hwecc;
> + nand_chip->ecc.write_page = anfc_write_page_hwecc;
> + nand_chip->ecc.write_oob = anfc_write_oob;
> + nand_chip->ecc.read_oob = anfc_read_oob;
> +
> + for (i = 0; i < ARRAY_SIZE(ecc_matrix); i++) {
> + if ((ecc_matrix[i].pagesize == mtd->writesize) &&
> + (ecc_matrix[i].codeword_size >= nand_chip->ecc_step_ds)) {
> + found = i;
> + if (ecc_matrix[i].eccbits >= nand_chip->ecc_strength_ds)
> + break;
> + }
> + }
Should be replaced by the logic I proposed at the beginning of this
answer.
> +
> + if (found < 0) {
> + dev_err(nfc->dev, "ECC scheme not supported");
> + return 1;
> + }
> + if (ecc_matrix[found].bch) {
> + switch (ecc_matrix[found].eccbits) {
> + case 12:
> + bchmode = 0x1;
> + break;
> + case 8:
> + bchmode = 0x2;
> + break;
> + case 4:
> + bchmode = 0x3;
> + break;
> + case 24:
> + bchmode = 0x4;
> + break;
> + default:
> + bchmode = 0x0;
> + }
> + }
> +
> + nand_chip->ecc.strength = ecc_matrix[found].eccbits;
> + nand_chip->ecc.size = ecc_matrix[found].codeword_size;
> + nand_chip->ecc.steps = ecc_matrix[found].pagesize /
> + ecc_matrix[found].codeword_size;
> + nand_chip->ecc.bytes = ecc_matrix[found].eccsize /
> + nand_chip->ecc.steps;
Okay, because of the unaligned eccsize value, you might end up with
something slightly different from the reality.
> + nfc->ecclayout.eccbytes = ecc_matrix[found].eccsize;
> + nfc->bch = ecc_matrix[found].bch;
> + oob_index = mtd->oobsize - nfc->ecclayout.eccbytes;
> + ecc_addr = mtd->writesize + oob_index;
> +
> + for (i = 0; i < nand_chip->ecc.size; i++)
> + nfc->ecclayout.eccpos[i] = oob_index + i;
> +
> + nfc->ecclayout.oobfree->offset = 2;
> + nfc->ecclayout.oobfree->length = oob_index -
> + nfc->ecclayout.oobfree->offset;
> +
> + nand_chip->ecc.layout = &nfc->ecclayout;
Should be replaced by mtd_set_ooblayout().
> + regval = ecc_addr | (ecc_matrix[found].eccsize << ECC_SIZE_SHIFT) |
> + (ecc_matrix[found].bch << BCH_EN_SHIFT);
> + writel(regval, nfc->base + ECC_OFST);
> +
> + regval = readl(nfc->base + MEM_ADDR2_OFST);
> + regval = (regval & ~(BCH_MODE_MASK)) | (bchmode << BCH_MODE_SHIFT);
> + writel(regval, nfc->base + MEM_ADDR2_OFST);
> +
> + if (nand_chip->ecc_step_ds >= 1024)
> + nfc->pktsize = 1024;
> + else
> + nfc->pktsize = 512;
> +
> + return 0;
> +}
> +
> +static void anfc_cmd_function(struct mtd_info *mtd,
> + unsigned int cmd, int column, int page_addr)
> +{
> + struct anfc *nfc = to_anfc(mtd);
> + bool wait = false, read = false;
> + u32 addrcycles, prog;
> + u32 *bufptr = (u32 *)nfc->buf;
> +
> + nfc->bufshift = 0;
> + nfc->curr_cmd = cmd;
> +
> + if (page_addr == -1)
> + page_addr = 0;
> + if (column == -1)
> + column = 0;
> +
> + switch (cmd) {
> + case NAND_CMD_RESET:
> + anfc_prepare_cmd(nfc, cmd, 0, 0, 0, 0);
> + prog = PROG_RST;
> + wait = true;
> + break;
> + case NAND_CMD_SEQIN:
> + addrcycles = nfc->raddr_cycles + nfc->caddr_cycles;
> + anfc_prepare_cmd(nfc, cmd, NAND_CMD_PAGEPROG, 1,
> + mtd->writesize, addrcycles);
> + anfc_setpagecoladdr(nfc, page_addr, column);
> + break;
> + case NAND_CMD_READOOB:
> + column += mtd->writesize;
> + case NAND_CMD_READ0:
> + case NAND_CMD_READ1:
> + addrcycles = nfc->raddr_cycles + nfc->caddr_cycles;
> + anfc_prepare_cmd(nfc, NAND_CMD_READ0, NAND_CMD_READSTART, 1,
> + mtd->writesize, addrcycles);
> + anfc_setpagecoladdr(nfc, page_addr, column);
> + break;
> + case NAND_CMD_RNDOUT:
> + anfc_prepare_cmd(nfc, cmd, NAND_CMD_RNDOUTSTART, 1,
> + mtd->writesize, 2);
> + anfc_setpagecoladdr(nfc, page_addr, column);
> + if (nfc->dma)
> + nfc->rdintrmask = XFER_COMPLETE;
> + else
> + nfc->rdintrmask = READ_READY;
> + break;
> + case NAND_CMD_PARAM:
> + anfc_prepare_cmd(nfc, cmd, 0, 0, 0, 1);
> + anfc_setpagecoladdr(nfc, page_addr, column);
> + anfc_setpktszcnt(nfc, sizeof(struct nand_onfi_params), 1);
> + anfc_readfifo(nfc, PROG_RDPARAM,
> + sizeof(struct nand_onfi_params));
> + break;
> + case NAND_CMD_READID:
> + anfc_prepare_cmd(nfc, cmd, 0, 0, 0, 1);
> + anfc_setpagecoladdr(nfc, page_addr, column);
> + anfc_setpktszcnt(nfc, ONFI_ID_LEN, 1);
> + anfc_readfifo(nfc, PROG_RDID, ONFI_ID_LEN);
> + break;
> + case NAND_CMD_ERASE1:
> + addrcycles = nfc->raddr_cycles;
> + prog = PROG_ERASE;
> + anfc_prepare_cmd(nfc, cmd, NAND_CMD_ERASE2, 0, 0, addrcycles);
> + column = page_addr & 0xffff;
> + page_addr = (page_addr >> PG_ADDR_SHIFT) & 0xffff;
> + anfc_setpagecoladdr(nfc, page_addr, column);
> + wait = true;
> + break;
> + case NAND_CMD_STATUS:
> + anfc_prepare_cmd(nfc, cmd, 0, 0, 0, 0);
> + anfc_setpktszcnt(nfc, nfc->spktsize/4, 1);
> + anfc_setpagecoladdr(nfc, page_addr, column);
> + prog = PROG_STATUS;
> + wait = read = true;
> + break;
> + case NAND_CMD_GET_FEATURES:
> + anfc_prepare_cmd(nfc, cmd, 0, 0, 0, 1);
> + anfc_setpagecoladdr(nfc, page_addr, column);
> + anfc_setpktszcnt(nfc, nfc->spktsize, 1);
> + anfc_readfifo(nfc, PROG_GET_FEATURE, 4);
> + break;
> + case NAND_CMD_SET_FEATURES:
> + anfc_prepare_cmd(nfc, cmd, 0, 0, 0, 1);
> + anfc_setpagecoladdr(nfc, page_addr, column);
> + anfc_setpktszcnt(nfc, nfc->spktsize, 1);
> + break;
> + default:
> + return;
> + }
> +
> + if (wait) {
> + anfc_enable_intrs(nfc, XFER_COMPLETE);
> + writel(prog, nfc->base + PROG_OFST);
> + anfc_wait_for_event(nfc, XFER_COMPLETE);
> + }
> +
> + if (read)
> + bufptr[0] = readl(nfc->base + FLASH_STS_OFST);
> +}
Can you try to implement ->cmd_ctrl() instead of ->cmdfunc(). This way
you'll benefit from all the improvements we'll to the default
nand_command_lp() and nand_command() implementation, and this also ease
maintenance on our side.
According to what I've seen so far this should be doable.
> +
> +static void anfc_select_chip(struct mtd_info *mtd, int num)
> +{
> + u32 val;
> + struct anfc *nfc = to_anfc(mtd);
> +
> + if (num == -1)
> + return;
> +
> + val = readl(nfc->base + MEM_ADDR2_OFST);
> + val = (val & ~(CS_MASK)) | (num << CS_SHIFT);
> + writel(val, nfc->base + MEM_ADDR2_OFST);
> +}
> +
> +static irqreturn_t anfc_irq_handler(int irq, void *ptr)
> +{
> + struct anfc *nfc = ptr;
> + u32 regval = 0, status;
> +
> + status = readl(nfc->base + INTR_STS_OFST);
> + if (status & XFER_COMPLETE) {
> + complete(&nfc->xfercomp);
> + regval |= XFER_COMPLETE;
> + }
> +
> + if (status & READ_READY) {
> + complete(&nfc->bufrdy);
> + regval |= READ_READY;
> + }
> +
> + if (status & WRITE_READY) {
> + complete(&nfc->bufrdy);
> + regval |= WRITE_READY;
> + }
> +
> + if (status & MBIT_ERROR) {
> + nfc->err = true;
> + complete(&nfc->bufrdy);
> + regval |= MBIT_ERROR;
> + }
> +
> + if (regval) {
> + writel(regval, nfc->base + INTR_STS_OFST);
> + writel(0, nfc->base + INTR_STS_EN_OFST);
> + writel(0, nfc->base + INTR_SIG_EN_OFST);
> +
> + return IRQ_HANDLED;
> + }
> +
> + return IRQ_NONE;
> +}
Should be reworked to use only one completion object.
> +
> +static int anfc_onfi_set_features(struct mtd_info *mtd, struct nand_chip *chip,
> + int addr, uint8_t *subfeature_param)
> +{
> + struct anfc *nfc = to_anfc(mtd);
> + int status;
> +
> + if (!chip->onfi_version || !(le16_to_cpu(chip->onfi_params.opt_cmd)
> + & ONFI_OPT_CMD_SET_GET_FEATURES))
> + return -EINVAL;
> +
> + chip->cmdfunc(mtd, NAND_CMD_SET_FEATURES, addr, -1);
> + anfc_writefifo(nfc, PROG_SET_FEATURE, nfc->spktsize, subfeature_param);
> +
> + status = chip->waitfunc(mtd, chip);
> + if (status & NAND_STATUS_FAIL)
> + return -EIO;
> +
> + return 0;
> +}
[]
A concrete example of why you should rework the
->read_byte()/->write_byte() implementation: this way you could get
rid of this custom ->set_features() implem.
> +
> +static int anfc_init_timing_mode(struct anfc *nfc)
> +{
> + int mode, err;
> + unsigned int feature[2], regval, i;
> + struct nand_chip *chip = &nfc->chip;
> + struct mtd_info *mtd = &nfc->mtd;
> +
> + memset(feature, 0, NVDDR_MODE_PACKET_SIZE);
> + /* Get nvddr timing modes */
> + mode = onfi_get_sync_timing_mode(chip) & 0xff;
> + if (!mode) {
> + mode = fls(onfi_get_async_timing_mode(&nfc->chip)) - 1;
> + regval = mode;
> + } else {
> + mode = fls(mode) - 1;
> + regval = NVDDR_MODE | mode << NVDDR_TIMING_MODE_SHIFT;
> + mode |= ONFI_DATA_INTERFACE_NVDDR;
> + }
> +
> + feature[0] = mode;
> + for (i = 0; i < nfc->num_cs; i++) {
> + chip->select_chip(mtd, i);
> + err = chip->onfi_set_features(mtd, chip,
> + ONFI_FEATURE_ADDR_TIMING_MODE,
> + (uint8_t *)feature);
> + if (err)
> + return err;
> + }
> + writel(regval, nfc->base + DATA_INTERFACE_REG);
> +
> + if (mode & ONFI_DATA_INTERFACE_NVDDR)
> + nfc->spktsize = NVDDR_MODE_PACKET_SIZE;
You seem to switch from SDR to DDR mode, but I don't see any timing
configuration. How is your controller able to adapt to different NAND
timings?
> +
> + return 0;
> +}
> +
> +static int anfc_probe(struct platform_device *pdev)
> +{
> + struct anfc *nfc;
> + struct mtd_info *mtd;
> + struct nand_chip *nand_chip;
> + struct resource *res;
> + struct mtd_part_parser_data ppdata;
> + int err;
> +
> + nfc = devm_kzalloc(&pdev->dev, sizeof(*nfc), GFP_KERNEL);
> + if (!nfc)
> + return -ENOMEM;
> +
> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
> + nfc->base = devm_ioremap_resource(&pdev->dev, res);
> + if (IS_ERR(nfc->base))
> + return PTR_ERR(nfc->base);
> +
> + mtd = &nfc->mtd;
> + nand_chip = &nfc->chip;
> + nand_chip->priv = nfc;
> + mtd->priv = nand_chip;
> + mtd->name = DRIVER_NAME;
> + nfc->dev = &pdev->dev;
> + mtd->dev.parent = &pdev->dev;
> +
> + nand_chip->cmdfunc = anfc_cmd_function;
> + nand_chip->waitfunc = anfc_device_ready;
You can leave nand_chip->waitfunc to NULL since your implementation is
doing exactly what the default implementation does.
> + nand_chip->chip_delay = 30;
> + nand_chip->read_buf = anfc_read_buf;
> + nand_chip->write_buf = anfc_write_buf;
> + nand_chip->read_byte = anfc_read_byte;
> + nand_chip->options = NAND_BUSWIDTH_AUTO | NAND_NO_SUBPAGE_WRITE;
> + nand_chip->bbt_options = NAND_BBT_USE_FLASH;
> + nand_chip->select_chip = anfc_select_chip;
> + nand_chip->onfi_set_features = anfc_onfi_set_features;
> + nfc->dma = of_property_read_bool(pdev->dev.of_node,
> + "arasan,has-mdma");
> + nfc->num_cs = 1;
> + of_property_read_u32(pdev->dev.of_node, "num-cs", &nfc->num_cs);
Already mentioned by Brian, but you should have a look at the
sunxi-nand binding to see how to represent the NAND controller and its
chips in the DT.
> + platform_set_drvdata(pdev, nfc);
> + init_completion(&nfc->bufrdy);
> + init_completion(&nfc->xfercomp);
> + nfc->irq = platform_get_irq(pdev, 0);
> + if (nfc->irq < 0) {
> + dev_err(&pdev->dev, "platform_get_irq failed\n");
> + return -ENXIO;
> + }
> + err = devm_request_irq(&pdev->dev, nfc->irq, anfc_irq_handler,
> + 0, "arasannfc", nfc);
> + if (err)
> + return err;
> + nfc->clk_sys = devm_clk_get(&pdev->dev, "clk_sys");
> + if (IS_ERR(nfc->clk_sys)) {
> + dev_err(&pdev->dev, "sys clock not found.\n");
> + return PTR_ERR(nfc->clk_sys);
> + }
> +
> + nfc->clk_flash = devm_clk_get(&pdev->dev, "clk_flash");
> + if (IS_ERR(nfc->clk_flash)) {
> + dev_err(&pdev->dev, "flash clock not found.\n");
> + return PTR_ERR(nfc->clk_flash);
> + }
> +
> + err = clk_prepare_enable(nfc->clk_sys);
> + if (err) {
> + dev_err(&pdev->dev, "Unable to enable sys clock.\n");
> + return err;
> + }
> +
> + err = clk_prepare_enable(nfc->clk_flash);
> + if (err) {
> + dev_err(&pdev->dev, "Unable to enable flash clock.\n");
> + goto clk_dis_sys;
> + }
> +
> + nfc->spktsize = SDR_MODE_PACKET_SIZE;
> + err = nand_scan_ident(mtd, nfc->num_cs, NULL);
> + if (err) {
> + dev_err(&pdev->dev, "nand_scan_ident for NAND failed\n");
> + goto clk_dis_all;
> + }
> + if (nand_chip->onfi_version) {
> + nfc->raddr_cycles = nand_chip->onfi_params.addr_cycles & 0xf;
> + nfc->caddr_cycles =
> + (nand_chip->onfi_params.addr_cycles >> 4) & 0xf;
> + } else {
> + /*For non-ONFI devices, configuring the address cyles as 5 */
> + nfc->raddr_cycles = nfc->caddr_cycles = 5;
> + }
Hm, this should not be dependent on ONFI support. It all depends on the
CHIP size, which you can deduce from mtd->writesize.
> +
> + err = anfc_init_timing_mode(nfc);
> + if (err) {
> + dev_err(&pdev->dev, "timing mode init failed\n");
> + goto clk_dis_all;
> + }
> +
> + err = anfc_ecc_init(mtd, &nand_chip->ecc);
> + if (err)
> + goto clk_dis_all;
> +
> + err = nand_scan_tail(mtd);
> + if (err) {
> + dev_err(&pdev->dev, "nand_scan_tail for NAND failed\n");
> + goto clk_dis_all;
> + }
> +
> + ppdata.of_node = pdev->dev.of_node;
> +
> + err = mtd_device_parse_register(&nfc->mtd, NULL, &ppdata, NULL, 0);
> + if (err)
> + goto clk_dis_all;
> +
> + return 0;
> +
> +clk_dis_all:
> + clk_disable_unprepare(nfc->clk_flash);
> +clk_dis_sys:
> + clk_disable_unprepare(nfc->clk_sys);
> +
> + return err;
> +}
> +
> +static int anfc_remove(struct platform_device *pdev)
> +{
> + struct anfc *nfc = platform_get_drvdata(pdev);
> +
> + clk_disable_unprepare(nfc->clk_sys);
> + clk_disable_unprepare(nfc->clk_flash);
> +
> + nand_release(&nfc->mtd);
> +
> + return 0;
> +}
> +
> +static const struct of_device_id anfc_ids[] = {
> + { .compatible = "arasan,nfc-v3p10" },
> + { }
> +};
> +MODULE_DEVICE_TABLE(of, anfc_ids);
> +
> +static struct platform_driver anfc_driver = {
> + .driver = {
> + .name = DRIVER_NAME,
> + .of_match_table = anfc_ids,
> + },
> + .probe = anfc_probe,
> + .remove = anfc_remove,
> +};
> +module_platform_driver(anfc_driver);
> +
> +MODULE_LICENSE("GPL");
> +MODULE_AUTHOR("Xilinx, Inc");
> +MODULE_DESCRIPTION("Arasan NAND Flash Controller Driver");
That's all I got for now.
Best Regards,
Boris
[1]http://lxr.free-electrons.com/source/drivers/mtd/nand/nand_base.c#L899
[2]http://lxr.free-electrons.com/source/drivers/mtd/nand/sunxi_nand.c#L283
[3]https://lkml.org/lkml/2016/3/8/270
[4]http://lxr.free-electrons.com/source/drivers/mtd/nand/nand_base.c#L1161
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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