From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brian Norris Subject: Re: [PATCH v2 2/2] mtd: nand: Add support for Arasan Nand Flash Controller Date: Wed, 20 May 2015 13:49:48 -0700 Message-ID: <20150520204948.GL11598@ld-irv-0074> References: <1432043357-558-1-git-send-email-punnaia@xilinx.com> <1432043357-558-2-git-send-email-punnaia@xilinx.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Content-Disposition: inline In-Reply-To: <1432043357-558-2-git-send-email-punnaia@xilinx.com> Sender: linux-doc-owner@vger.kernel.org To: Punnaiah Choudary Kalluri Cc: robh+dt@kernel.org, pawel.moll@arm.com, mark.rutland@arm.com, ijc+devicetree@hellion.org.uk, galak@codeaurora.org, rob@landley.net, michal.simek@xilinx.com, grant.likely@linaro.org, gregkh@linuxfoundation.org, jason@lakedaemon.net, ezequiel.garcia@free-electrons.com, arnd@arndb.de, dwmw2@infradead.org, artem.bityutskiy@linux.intel.com, jussi.kivilinna@iki.fi, acourbot@nvidia.com, joern@logfs.org, devicetree@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mtd@lists.infradead.org, kpc528@gmail.com, kalluripunnaiahchoudary@gmail.com, Punnaiah Choudary Kalluri List-Id: devicetree@vger.kernel.org On Tue, May 19, 2015 at 07:19:17PM +0530, Punnaiah Choudary Kalluri wro= te: > Added the basic driver for Arasan Nand Flash Controller used in > Zynq UltraScale+ MPSoC. It supports only Hw Ecc and upto 24bit > correction. >=20 > Signed-off-by: Punnaiah Choudary Kalluri > Tested-by: Michal Simek > --- > Changes in v2: > - Added missing of.h to avoid kbuild system report error > --- > drivers/mtd/nand/Kconfig | 7 + > drivers/mtd/nand/Makefile | 1 + > drivers/mtd/nand/arasan_nfc.c | 862 +++++++++++++++++++++++++++++++= ++++++++++ > 3 files changed, 870 insertions(+), 0 deletions(-) > create mode 100644 drivers/mtd/nand/arasan_nfc.c >=20 > diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig > index 5897d8d..64e497c 100644 > --- a/drivers/mtd/nand/Kconfig > +++ b/drivers/mtd/nand/Kconfig > @@ -530,4 +530,11 @@ config MTD_NAND_HISI504 > help > Enables support for NAND controller on Hisilicon SoC Hip04. > =20 > +config MTD_NAND_ARASAN > + tristate "Support for Arasan Nand Flash controller" > + depends on MTD_NAND > + 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 582bbd05..fd863ea 100644 > --- a/drivers/mtd/nand/Makefile > +++ b/drivers/mtd/nand/Makefile > @@ -52,5 +52,6 @@ obj-$(CONFIG_MTD_NAND_XWAY) +=3D xway_nand.o > obj-$(CONFIG_MTD_NAND_BCM47XXNFLASH) +=3D bcm47xxnflash/ > obj-$(CONFIG_MTD_NAND_SUNXI) +=3D sunxi_nand.o > obj-$(CONFIG_MTD_NAND_HISI504) +=3D hisi504_nand.o > +obj-$(CONFIG_MTD_NAND_ARASAN) +=3D arasan_nfc.o > =20 > nand-objs :=3D nand_base.o nand_bbt.o nand_timings.o > diff --git a/drivers/mtd/nand/arasan_nfc.c b/drivers/mtd/nand/arasan_= nfc.c > new file mode 100644 > index 0000000..5736864 > --- /dev/null > +++ b/drivers/mtd/nand/arasan_nfc.c > @@ -0,0 +1,862 @@ > +/* > + * Arasan Nand Flash Controller Driver > + * > + * Copyright (C) 2014 - 2015 Xilinx, Inc. > + * > + * This program is free software; you can redistribute it and/or mod= ify it under > + * the terms of the GNU General Public License version 2 as publishe= d by the > + * Free Software Foundation; either version 2 of the License, or (at= your > + * option) any later version. > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +#define DRIVER_NAME "arasan_nfc" > +#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 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 PAGE_SIZE_MASK GENMASK(25, 23) > +#define PAGE_SIZE_SHIFT 23 > +#define PAGE_SIZE_512 0 > +#define PAGE_SIZE_1K 5 > +#define PAGE_SIZE_2K 1 > +#define PAGE_SIZE_4K 2 > +#define PAGE_SIZE_8K 3 > +#define 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 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 ONFI_ID_LEN 8 > +#define TEMP_BUF_SIZE 512 > + > +/** > + * 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[] =3D { > + {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} > +}; > + > +/** > + * struct anfc - Defines the Arasan NAND flash driver instance > + * @chip: NAND chip information structure. > + * @mtd: MTD information structure. > + * @parts: Pointer to the mtd_partition structure. > + * @dev: Pointer to the device structure. > + * @base: Virtual address of the NAND flash device. > + * @curr_cmd: Current command issued. > + * @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 > + * @page: Page address to be use for write oob operations. > + * @pktsize: Packet size for read / write operation. > + * @bufshift: Variable used for indexing buffer operation > + * @rdintrmask: Interrupt mask value for read 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; > + struct mtd_partition *parts; ^^ This field is unused. > + struct device *dev; > + > + void __iomem *base; > + int curr_cmd; > + > + bool dma; > + bool bch; > + bool err; > + bool iswriteoob; > + > + u8 buf[TEMP_BUF_SIZE]; > + > + u16 raddr_cycles; > + u16 caddr_cycles; > + > + u32 irq; > + u32 page; > + u32 pktsize; > + u32 bufshift; > + u32 rdintrmask; > + > + struct completion bufrdy; > + struct completion xfercomp; > + struct nand_ecclayout ecclayout; > +}; > + > +static u8 anfc_page(u32 pagesize) > +{ > + switch (pagesize) { > + case 512: > + return PAGE_SIZE_512; > + case 2048: > + return PAGE_SIZE_2K; > + case 4096: > + return PAGE_SIZE_4K; > + case 8192: > + return PAGE_SIZE_8K; > + case 16384: > + return PAGE_SIZE_16K; > + case 1024: > + return PAGE_SIZE_1K; > + 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; > + int ret; > + > + if (event =3D=3D XFER_COMPLETE) > + comp =3D &nfc->xfercomp; > + else > + comp =3D &nfc->bufrdy; > + > + ret =3D wait_for_completion_timeout(comp, msecs_to_jiffies(EVNT_TIM= EOUT)); > + > + return ret; > +} > + > +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, u= 8 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 =3D readl(nfc->base + MEM_ADDR2_OFST); > + val =3D (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 =3D cmd1 | (cmd2 << CMD2_SHIFT); > + if (dmamode && nfc->dma) > + regval |=3D DMA_ENABLE << DMA_EN_SHIFT; > + if (addrcycles) > + regval |=3D addrcycles << ADDR_CYCLES_SHIFT; > + if (pagesize) > + regval |=3D anfc_page(pagesize) << PAGE_SIZE_SHIFT; > + writel(regval, nfc->base + CMD_OFST); > +} > + > +static int anfc_device_ready(struct mtd_info *mtd, > + struct nand_chip *chip) > +{ > + u8 status; > + u32 timeout =3D STATUS_TIMEOUT; > + > + while (timeout--) { > + chip->cmdfunc(mtd, NAND_CMD_STATUS, 0, 0); > + status =3D chip->read_byte(mtd); > + if (status & ONFI_STATUS_READY) { > + if (status & ONFI_STATUS_FAIL) > + return NAND_STATUS_FAIL; > + return 0; > + } > + } No, we can't just do a busy-wait loop at an arbitrary count of 2000 cycles. Can you do something that's interrupt-based? Or at least time yourself with jiffies or something similar. > + > + pr_err("%s timed out\n", __func__); > + return -ETIMEDOUT; > +} > + > +static int anfc_read_oob(struct mtd_info *mtd, struct nand_chip *chi= p, > + int page) > +{ > + struct anfc *nfc =3D container_of(mtd, struct anfc, mtd); > + > + chip->cmdfunc(mtd, NAND_CMD_READOOB, 0, page); > + if (nfc->dma) > + nfc->rdintrmask =3D XFER_COMPLETE; > + else > + nfc->rdintrmask =3D READ_READY; > + chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); > + > + return 0; > +} > + > +static int anfc_write_oob(struct mtd_info *mtd, struct nand_chip *ch= ip, > + int page) > +{ > + struct anfc *nfc =3D container_of(mtd, struct anfc, mtd); > + > + nfc->iswriteoob =3D true; > + chip->cmdfunc(mtd, NAND_CMD_SEQIN, mtd->writesize, page); > + chip->write_buf(mtd, chip->oob_poi, mtd->oobsize); > + nfc->iswriteoob =3D false; > + > + return 0; > +} > + > +static void anfc_read_buf(struct mtd_info *mtd, uint8_t *buf, int le= n) > +{ > + u32 i, pktcount, buf_rd_cnt =3D 0, pktsize; > + u32 *bufptr =3D (u32 *)buf; > + struct anfc *nfc =3D container_of(mtd, struct anfc, mtd); > + dma_addr_t paddr =3D 0; > + > + if (nfc->curr_cmd =3D=3D NAND_CMD_READ0) { > + pktsize =3D nfc->pktsize; > + if (mtd->writesize % pktsize) > + pktcount =3D mtd->writesize / pktsize + 1; > + else > + pktcount =3D mtd->writesize / pktsize; > + } else { > + pktsize =3D len; > + pktcount =3D 1; > + } > + > + anfc_setpktszcnt(nfc, pktsize, pktcount); > + > + if (nfc->dma) { > + paddr =3D dma_map_single(nfc->dev, buf, len, DMA_FROM_DEVICE); > + if (dma_mapping_error(nfc->dev, paddr)) { > + dev_err(nfc->dev, "Read buffer mapping error"); > + return; > + } > + writel(paddr, nfc->base + DMA_ADDR0_OFST); > + writel(paddr >> 32, nfc->base + DMA_ADDR1_OFST); drivers/mtd/nand/arasan_nfc.c: In function =E2=80=98anfc_read_buf=E2=80= =99: drivers/mtd/nand/arasan_nfc.c:355:3: warning: right shift count >=3D wi= dth of type [enabled by default] writel(paddr >> 32, nfc->base + DMA_ADDR1_OFST); ^ How about using upper_32_bits() and lower_32_bits()? > + 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 =3D=3D pktcount) > + anfc_enable_intrs(nfc, XFER_COMPLETE); > + > + for (i =3D 0; i < pktsize / 4; i++) > + bufptr[i] =3D readl(nfc->base + DATA_PORT_OFST); > + > + bufptr +=3D (pktsize / 4); > + > + if (buf_rd_cnt < pktcount) > + anfc_enable_intrs(nfc, nfc->rdintrmask); > + } > + > + anfc_wait_for_event(nfc, XFER_COMPLETE); > +} > + > +static void anfc_write_buf(struct mtd_info *mtd, const uint8_t *buf,= int len) > +{ > + u32 buf_wr_cnt =3D 0, pktcount =3D 1, i, pktsize; > + u32 *bufptr =3D (u32 *)buf; > + struct anfc *nfc =3D container_of(mtd, struct anfc, mtd); > + dma_addr_t paddr =3D 0; > + > + if (nfc->iswriteoob) { > + pktsize =3D len; > + pktcount =3D 1; > + } else { > + pktsize =3D nfc->pktsize; > + pktcount =3D mtd->writesize / pktsize; > + } > + > + anfc_setpktszcnt(nfc, pktsize, pktcount); > + > + if (nfc->dma) { > + paddr =3D 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; > + } > + writel(paddr, nfc->base + DMA_ADDR0_OFST); > + writel(paddr >> 32, nfc->base + DMA_ADDR1_OFST); Same problem as in read_buf(). > + 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 =3D=3D pktcount) > + anfc_enable_intrs(nfc, XFER_COMPLETE); > + > + for (i =3D 0; i < (pktsize / 4); i++) > + writel(bufptr[i], nfc->base + DATA_PORT_OFST); > + > + bufptr +=3D (pktsize / 4); > + > + if (buf_wr_cnt < pktcount) > + anfc_enable_intrs(nfc, WRITE_READY); > + } > + > + anfc_wait_for_event(nfc, XFER_COMPLETE); > +} > + > +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 =3D container_of(mtd, struct anfc, mtd); > + > + anfc_set_eccsparecmd(nfc, NAND_CMD_RNDOUT, NAND_CMD_RNDOUTSTART); > + > + val =3D readl(nfc->base + CMD_OFST); > + val =3D val | ECC_ENABLE; > + writel(val, nfc->base + CMD_OFST); > + > + if (nfc->dma) > + nfc->rdintrmask =3D XFER_COMPLETE; > + else > + nfc->rdintrmask =3D READ_READY; > + > + if (!nfc->bch) > + nfc->rdintrmask =3D MBIT_ERROR; > + > + chip->read_buf(mtd, buf, mtd->writesize); > + > + val =3D readl(nfc->base + ECC_ERR_CNT_OFST); > + if (nfc->bch) { > + mtd->ecc_stats.corrected +=3D val & PAGE_ERR_CNT_MASK; > + } else { > + val =3D readl(nfc->base + ECC_ERR_CNT_1BIT_OFST); > + mtd->ecc_stats.corrected +=3D val; > + val =3D readl(nfc->base + ECC_ERR_CNT_2BIT_OFST); > + mtd->ecc_stats.failed +=3D 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); > + } > + nfc->err =3D false; > + > + if (oob_required) > + chip->ecc.read_oob(mtd, chip, page); > + > + return 0; > +} > + > +static int anfc_write_page_hwecc(struct mtd_info *mtd, > + struct nand_chip *chip, const uint8_t *buf, > + int oob_required) > +{ > + u32 val, i; > + struct anfc *nfc =3D container_of(mtd, struct anfc, mtd); > + uint8_t *ecc_calc =3D chip->buffers->ecccalc; > + uint32_t *eccpos =3D chip->ecc.layout->eccpos; > + > + anfc_set_eccsparecmd(nfc, NAND_CMD_RNDIN, 0); > + > + val =3D readl(nfc->base + CMD_OFST); > + val =3D 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, nfc->page); > + if (nfc->dma) > + nfc->rdintrmask =3D XFER_COMPLETE; > + else > + nfc->rdintrmask =3D READ_READY; > + chip->read_buf(mtd, ecc_calc, mtd->oobsize); > + for (i =3D 0; i < chip->ecc.total; i++) > + chip->oob_poi[eccpos[i]] =3D ecc_calc[eccpos[i]]; > + chip->ecc.write_oob(mtd, chip, nfc->page); > + } > + > + return 0; > +} > + > +static u8 anfc_read_byte(struct mtd_info *mtd) > +{ > + struct anfc *nfc =3D container_of(mtd, struct anfc, mtd); > + > + return nfc->buf[nfc->bufshift++]; > +} > + > +static void anfc_readfifo(struct anfc *nfc, u32 prog, u32 size) > +{ > + u32 i, *bufptr =3D (u32 *)&nfc->buf[0]; > + > + 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); > + > + for (i =3D 0; i < size / 4; i++) > + bufptr[i] =3D readl(nfc->base + DATA_PORT_OFST); > + > + anfc_wait_for_event(nfc, XFER_COMPLETE); > +} > + > +static int anfc_ecc_init(struct mtd_info *mtd, > + struct nand_ecc_ctrl *ecc) > +{ > + u32 oob_index, i, ecc_addr, regval, bchmode =3D 0; > + struct nand_chip *nand_chip =3D mtd->priv; > + struct anfc *nfc =3D container_of(mtd, struct anfc, mtd); > + int found =3D -1; > + > + nand_chip->ecc.mode =3D NAND_ECC_HW; > + nand_chip->ecc.read_page =3D anfc_read_page_hwecc; > + nand_chip->ecc.write_page =3D anfc_write_page_hwecc; > + nand_chip->ecc.write_oob =3D anfc_write_oob; > + nand_chip->ecc.read_oob =3D anfc_read_oob; > + > + for (i =3D 0; i < sizeof(ecc_matrix) / sizeof(struct anfc_ecc_matri= x); > + i++) { > + if ((ecc_matrix[i].pagesize =3D=3D mtd->writesize) && > + (ecc_matrix[i].codeword_size >=3D nand_chip->ecc_step_ds)) { > + if (ecc_matrix[i].eccbits >=3D > + nand_chip->ecc_strength_ds) { > + found =3D i; > + break; > + } > + found =3D i; > + } > + } > + > + 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 =3D 0x1; > + break; > + case 8: > + bchmode =3D 0x2; > + break; > + case 4: > + bchmode =3D 0x3; > + break; > + case 24: > + bchmode =3D 0x4; > + break; > + default: > + bchmode =3D 0x0; > + } > + } > + > + nand_chip->ecc.strength =3D ecc_matrix[found].eccbits; > + nand_chip->ecc.size =3D ecc_matrix[found].codeword_size; > + nand_chip->ecc.steps =3D ecc_matrix[found].pagesize / > + ecc_matrix[found].codeword_size; > + nand_chip->ecc.bytes =3D ecc_matrix[found].eccsize / > + nand_chip->ecc.steps; > + nfc->ecclayout.eccbytes =3D ecc_matrix[found].eccsize; > + nfc->bch =3D ecc_matrix[found].bch; > + oob_index =3D nand_chip->onfi_params.spare_bytes_per_page - > + nfc->ecclayout.eccbytes; sparse doesn't like this: drivers/mtd/nand/arasan_nfc.c:599:43: warning: restricted __le16 degrad= es to integer [sparse] You need to use __le16_to_cpu() when accessing ONFI params. But really, you should be using mtd->oobsize, not onfi_params. > + ecc_addr =3D mtd->writesize + oob_index; > + > + for (i =3D 0; i < nand_chip->ecc.size; i++) > + nfc->ecclayout.eccpos[i] =3D oob_index + i; > + > + nfc->ecclayout.oobfree->offset =3D 2; > + nfc->ecclayout.oobfree->length =3D oob_index - > + nfc->ecclayout.oobfree->offset; > + > + nand_chip->ecc.layout =3D &(nfc->ecclayout); > + regval =3D ecc_addr | (ecc_matrix[found].eccsize << ECC_SIZE_SHIFT)= | > + (ecc_matrix[found].bch << BCH_EN_SHIFT); > + writel(regval, nfc->base + ECC_OFST); > + > + regval =3D readl(nfc->base + MEM_ADDR2_OFST); > + regval =3D (regval & ~(BCH_MODE_MASK)) | (bchmode << BCH_MODE_SHIFT= ); > + writel(regval, nfc->base + MEM_ADDR2_OFST); > + > + if (nand_chip->ecc_step_ds >=3D 1024) > + nfc->pktsize =3D 1024; > + else > + nfc->pktsize =3D 512; > + > + return 0; > +} > + > +static void anfc_cmd_function(struct mtd_info *mtd, > + unsigned int cmd, int column, int page_addr) > +{ > + struct anfc *nfc =3D container_of(mtd, struct anfc, mtd); > + bool wait =3D false, read =3D false; > + u32 addrcycles, prog; > + u32 *bufptr =3D (u32 *)&nfc->buf[0]; > + > + nfc->bufshift =3D 0; > + nfc->curr_cmd =3D cmd; > + > + if (page_addr =3D=3D -1) > + page_addr =3D 0; > + if (column =3D=3D -1) > + column =3D 0; > + > + switch (cmd) { > + case NAND_CMD_RESET: > + anfc_prepare_cmd(nfc, cmd, 0, 0, 0, 0); > + prog =3D PROG_RST; > + wait =3D true; > + break; > + case NAND_CMD_SEQIN: > + addrcycles =3D nfc->raddr_cycles + nfc->caddr_cycles; > + nfc->page =3D page_addr; > + anfc_prepare_cmd(nfc, cmd, NAND_CMD_PAGEPROG, 1, > + mtd->writesize, addrcycles); > + anfc_setpagecoladdr(nfc, page_addr, column); > + break; > + case NAND_CMD_READOOB: > + column +=3D mtd->writesize; > + case NAND_CMD_READ0: > + case NAND_CMD_READ1: > + addrcycles =3D 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 =3D XFER_COMPLETE; > + else > + nfc->rdintrmask =3D 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 =3D nfc->raddr_cycles; > + prog =3D PROG_ERASE; > + anfc_prepare_cmd(nfc, cmd, NAND_CMD_ERASE2, 0, 0, addrcycles); > + column =3D page_addr & 0xffff; > + page_addr =3D (page_addr >> PG_ADDR_SHIFT) & 0xffff; > + anfc_setpagecoladdr(nfc, page_addr, column); > + wait =3D true; > + break; > + case NAND_CMD_STATUS: > + anfc_prepare_cmd(nfc, cmd, 0, 0, 0, 0); > + anfc_setpktszcnt(nfc, 1, 1); > + anfc_setpagecoladdr(nfc, page_addr, column); > + prog =3D PROG_STATUS; > + wait =3D read =3D true; > + 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] =3D readl(nfc->base + FLASH_STS_OFST); > +} > + > +static void anfc_select_chip(struct mtd_info *mtd, int num) > +{ > + u32 val; > + struct anfc *nfc =3D container_of(mtd, struct anfc, mtd); > + > + if (num =3D=3D -1) > + return; > + > + val =3D readl(nfc->base + MEM_ADDR2_OFST); > + val =3D (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 =3D ptr; > + u32 regval =3D 0, status; > + > + status =3D readl(nfc->base + INTR_STS_OFST); > + if (status & XFER_COMPLETE) { > + complete(&nfc->xfercomp); > + regval |=3D XFER_COMPLETE; > + } > + > + if (status & READ_READY) { > + complete(&nfc->bufrdy); > + regval |=3D READ_READY; > + } > + > + if (status & WRITE_READY) { > + complete(&nfc->bufrdy); > + regval |=3D WRITE_READY; > + } > + > + if (status & MBIT_ERROR) { > + nfc->err =3D true; > + complete(&nfc->bufrdy); > + regval |=3D 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; > +} > + > +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 =3D devm_kzalloc(&pdev->dev, sizeof(*nfc), GFP_KERNEL); > + if (!nfc) > + return -ENOMEM; > + > + res =3D platform_get_resource(pdev, IORESOURCE_MEM, 0); > + nfc->base =3D devm_ioremap_resource(&pdev->dev, res); > + if (IS_ERR(nfc->base)) > + return PTR_ERR(nfc->base); > + > + mtd =3D &nfc->mtd; > + nand_chip =3D &nfc->chip; > + nand_chip->priv =3D nfc; > + mtd->priv =3D nand_chip; > + mtd->owner =3D THIS_MODULE; > + mtd->name =3D DRIVER_NAME; > + nfc->dev =3D &pdev->dev; You should set mtd->dev.parent too. > + > + nand_chip->cmdfunc =3D anfc_cmd_function; > + nand_chip->waitfunc =3D anfc_device_ready; > + nand_chip->chip_delay =3D 30; > + nand_chip->read_buf =3D anfc_read_buf; > + nand_chip->write_buf =3D anfc_write_buf; > + nand_chip->read_byte =3D anfc_read_byte; > + nand_chip->bbt_options =3D NAND_BBT_USE_FLASH; > + nand_chip->select_chip =3D anfc_select_chip; > + mtd->size =3D nand_chip->chipsize; This line looks superfluous. chipsize isn't even set at this point. > + nfc->dma =3D of_property_read_bool(pdev->dev.of_node, > + "arasan,has-mdma"); > + platform_set_drvdata(pdev, nfc); > + init_completion(&nfc->bufrdy); > + init_completion(&nfc->xfercomp); > + nfc->irq =3D platform_get_irq(pdev, 0); Check for errors? > + err =3D devm_request_irq(&pdev->dev, nfc->irq, anfc_irq_handler, > + 0, "arasannfc", nfc); > + if (err) > + return err; > + > + if (nand_scan_ident(mtd, 1, NULL)) { > + dev_err(&pdev->dev, "nand_scan_ident for NAND failed\n"); > + return -ENXIO; > + } > + nfc->raddr_cycles =3D nand_chip->onfi_params.addr_cycles & 0xF; > + nfc->caddr_cycles =3D (nand_chip->onfi_params.addr_cycles >> 4) & 0= xF; Do you *have* to get this from ONFI? What if someone uses non-ONFI flash? You should at least check if this is an ONFI flash before using these param values. > + > + if (anfc_ecc_init(mtd, &nand_chip->ecc)) > + return -ENXIO; > + > + if (nand_scan_tail(mtd)) { > + dev_err(&pdev->dev, "nand_scan_tail for NAND failed\n"); > + return -ENXIO; > + } > + > + ppdata.of_node =3D pdev->dev.of_node; > + > + mtd_device_parse_register(&nfc->mtd, NULL, &ppdata, NULL, 0); > + return 0; You're ignoring the return value from mtd_device_parse_register(). How about: return mtd_device_parse_register(&nfc->mtd, NULL, &ppdata, NULL, 0); > +} > + > +static int anfc_remove(struct platform_device *pdev) > +{ > + struct anfc *nfc =3D platform_get_drvdata(pdev); > + > + nand_release(&nfc->mtd); > + > + return 0; > +} > + > +static const struct of_device_id anfc_ids[] =3D { > + { .compatible =3D "arasan,nfc-v3p10" }, > + { } > +}; > +MODULE_DEVICE_TABLE(of, anfc_ids); > + > +static struct platform_driver anfc_driver =3D { > + .driver =3D { > + .name =3D DRIVER_NAME, > + .of_match_table =3D anfc_ids, > + }, > + .probe =3D anfc_probe, > + .remove =3D anfc_remove, > +}; > +module_platform_driver(anfc_driver); > + > +MODULE_LICENSE("GPL"); > +MODULE_AUTHOR("Xilinx, Inc"); > +MODULE_DESCRIPTION("Arasan NAND Flash Controller Driver"); Brian