diff options
Diffstat (limited to 'drivers/mtd/nand/raw/atmel/nand-controller.c')
| -rw-r--r-- | drivers/mtd/nand/raw/atmel/nand-controller.c | 2565 |
1 files changed, 2565 insertions, 0 deletions
diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c new file mode 100644 index 000000000000..12f6753d47ae --- /dev/null +++ b/drivers/mtd/nand/raw/atmel/nand-controller.c @@ -0,0 +1,2565 @@ +/* + * Copyright 2017 ATMEL + * Copyright 2017 Free Electrons + * + * Author: Boris Brezillon <boris.brezillon@free-electrons.com> + * + * Derived from the atmel_nand.c driver which contained the following + * copyrights: + * + * Copyright 2003 Rick Bronson + * + * Derived from drivers/mtd/nand/autcpu12.c (removed in v3.8) + * Copyright 2001 Thomas Gleixner (gleixner@autronix.de) + * + * Derived from drivers/mtd/spia.c (removed in v3.8) + * Copyright 2000 Steven J. Hill (sjhill@cotw.com) + * + * + * Add Hardware ECC support for AT91SAM9260 / AT91SAM9263 + * Richard Genoud (richard.genoud@gmail.com), Adeneo Copyright 2007 + * + * Derived from Das U-Boot source code + * (u-boot-1.1.5/board/atmel/at91sam9263ek/nand.c) + * Copyright 2006 ATMEL Rousset, Lacressonniere Nicolas + * + * Add Programmable Multibit ECC support for various AT91 SoC + * Copyright 2012 ATMEL, Hong Xu + * + * Add Nand Flash Controller support for SAMA5 SoC + * Copyright 2013 ATMEL, Josh Wu (josh.wu@atmel.com) + * + * 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. + * + * A few words about the naming convention in this file. This convention + * applies to structure and function names. + * + * Prefixes: + * + * - atmel_nand_: all generic structures/functions + * - atmel_smc_nand_: all structures/functions specific to the SMC interface + * (at91sam9 and avr32 SoCs) + * - atmel_hsmc_nand_: all structures/functions specific to the HSMC interface + * (sama5 SoCs and later) + * - atmel_nfc_: all structures/functions used to manipulate the NFC sub-block + * that is available in the HSMC block + * - <soc>_nand_: all SoC specific structures/functions + */ + +#include <linux/clk.h> +#include <linux/dma-mapping.h> +#include <linux/dmaengine.h> +#include <linux/genalloc.h> +#include <linux/gpio.h> +#include <linux/gpio/consumer.h> +#include <linux/interrupt.h> +#include <linux/mfd/syscon.h> +#include <linux/mfd/syscon/atmel-matrix.h> +#include <linux/mfd/syscon/atmel-smc.h> +#include <linux/module.h> +#include <linux/mtd/rawnand.h> +#include <linux/of_address.h> +#include <linux/of_irq.h> +#include <linux/of_platform.h> +#include <linux/iopoll.h> +#include <linux/platform_device.h> +#include <linux/regmap.h> + +#include "pmecc.h" + +#define ATMEL_HSMC_NFC_CFG 0x0 +#define ATMEL_HSMC_NFC_CFG_SPARESIZE(x) (((x) / 4) << 24) +#define ATMEL_HSMC_NFC_CFG_SPARESIZE_MASK GENMASK(30, 24) +#define ATMEL_HSMC_NFC_CFG_DTO(cyc, mul) (((cyc) << 16) | ((mul) << 20)) +#define ATMEL_HSMC_NFC_CFG_DTO_MAX GENMASK(22, 16) +#define ATMEL_HSMC_NFC_CFG_RBEDGE BIT(13) +#define ATMEL_HSMC_NFC_CFG_FALLING_EDGE BIT(12) +#define ATMEL_HSMC_NFC_CFG_RSPARE BIT(9) +#define ATMEL_HSMC_NFC_CFG_WSPARE BIT(8) +#define ATMEL_HSMC_NFC_CFG_PAGESIZE_MASK GENMASK(2, 0) +#define ATMEL_HSMC_NFC_CFG_PAGESIZE(x) (fls((x) / 512) - 1) + +#define ATMEL_HSMC_NFC_CTRL 0x4 +#define ATMEL_HSMC_NFC_CTRL_EN BIT(0) +#define ATMEL_HSMC_NFC_CTRL_DIS BIT(1) + +#define ATMEL_HSMC_NFC_SR 0x8 +#define ATMEL_HSMC_NFC_IER 0xc +#define ATMEL_HSMC_NFC_IDR 0x10 +#define ATMEL_HSMC_NFC_IMR 0x14 +#define ATMEL_HSMC_NFC_SR_ENABLED BIT(1) +#define ATMEL_HSMC_NFC_SR_RB_RISE BIT(4) +#define ATMEL_HSMC_NFC_SR_RB_FALL BIT(5) +#define ATMEL_HSMC_NFC_SR_BUSY BIT(8) +#define ATMEL_HSMC_NFC_SR_WR BIT(11) +#define ATMEL_HSMC_NFC_SR_CSID GENMASK(14, 12) +#define ATMEL_HSMC_NFC_SR_XFRDONE BIT(16) +#define ATMEL_HSMC_NFC_SR_CMDDONE BIT(17) +#define ATMEL_HSMC_NFC_SR_DTOE BIT(20) +#define ATMEL_HSMC_NFC_SR_UNDEF BIT(21) +#define ATMEL_HSMC_NFC_SR_AWB BIT(22) +#define ATMEL_HSMC_NFC_SR_NFCASE BIT(23) +#define ATMEL_HSMC_NFC_SR_ERRORS (ATMEL_HSMC_NFC_SR_DTOE | \ + ATMEL_HSMC_NFC_SR_UNDEF | \ + ATMEL_HSMC_NFC_SR_AWB | \ + ATMEL_HSMC_NFC_SR_NFCASE) +#define ATMEL_HSMC_NFC_SR_RBEDGE(x) BIT((x) + 24) + +#define ATMEL_HSMC_NFC_ADDR 0x18 +#define ATMEL_HSMC_NFC_BANK 0x1c + +#define ATMEL_NFC_MAX_RB_ID 7 + +#define ATMEL_NFC_SRAM_SIZE 0x2400 + +#define ATMEL_NFC_CMD(pos, cmd) ((cmd) << (((pos) * 8) + 2)) +#define ATMEL_NFC_VCMD2 BIT(18) +#define ATMEL_NFC_ACYCLE(naddrs) ((naddrs) << 19) +#define ATMEL_NFC_CSID(cs) ((cs) << 22) +#define ATMEL_NFC_DATAEN BIT(25) +#define ATMEL_NFC_NFCWR BIT(26) + +#define ATMEL_NFC_MAX_ADDR_CYCLES 5 + +#define ATMEL_NAND_ALE_OFFSET BIT(21) +#define ATMEL_NAND_CLE_OFFSET BIT(22) + +#define DEFAULT_TIMEOUT_MS 1000 +#define MIN_DMA_LEN 128 + +enum atmel_nand_rb_type { + ATMEL_NAND_NO_RB, + ATMEL_NAND_NATIVE_RB, + ATMEL_NAND_GPIO_RB, +}; + +struct atmel_nand_rb { + enum atmel_nand_rb_type type; + union { + struct gpio_desc *gpio; + int id; + }; +}; + +struct atmel_nand_cs { + int id; + struct atmel_nand_rb rb; + struct gpio_desc *csgpio; + struct { + void __iomem *virt; + dma_addr_t dma; + } io; + + struct atmel_smc_cs_conf smcconf; +}; + +struct atmel_nand { + struct list_head node; + struct device *dev; + struct nand_chip base; + struct atmel_nand_cs *activecs; + struct atmel_pmecc_user *pmecc; + struct gpio_desc *cdgpio; + int numcs; + struct atmel_nand_cs cs[]; +}; + +static inline struct atmel_nand *to_atmel_nand(struct nand_chip *chip) +{ + return container_of(chip, struct atmel_nand, base); +} + +enum atmel_nfc_data_xfer { + ATMEL_NFC_NO_DATA, + ATMEL_NFC_READ_DATA, + ATMEL_NFC_WRITE_DATA, +}; + +struct atmel_nfc_op { + u8 cs; + u8 ncmds; + u8 cmds[2]; + u8 naddrs; + u8 addrs[5]; + enum atmel_nfc_data_xfer data; + u32 wait; + u32 errors; +}; + +struct atmel_nand_controller; +struct atmel_nand_controller_caps; + +struct atmel_nand_controller_ops { + int (*probe)(struct platform_device *pdev, + const struct atmel_nand_controller_caps *caps); + int (*remove)(struct atmel_nand_controller *nc); + void (*nand_init)(struct atmel_nand_controller *nc, + struct atmel_nand *nand); + int (*ecc_init)(struct atmel_nand *nand); + int (*setup_data_interface)(struct atmel_nand *nand, int csline, + const struct nand_data_interface *conf); +}; + +struct atmel_nand_controller_caps { + bool has_dma; + bool legacy_of_bindings; + u32 ale_offs; + u32 cle_offs; + const struct atmel_nand_controller_ops *ops; +}; + +struct atmel_nand_controller { + struct nand_hw_control base; + const struct atmel_nand_controller_caps *caps; + struct device *dev; + struct regmap *smc; + struct dma_chan *dmac; + struct atmel_pmecc *pmecc; + struct list_head chips; + struct clk *mck; +}; + +static inline struct atmel_nand_controller * +to_nand_controller(struct nand_hw_control *ctl) +{ + return container_of(ctl, struct atmel_nand_controller, base); +} + +struct atmel_smc_nand_controller { + struct atmel_nand_controller base; + struct regmap *matrix; + unsigned int ebi_csa_offs; +}; + +static inline struct atmel_smc_nand_controller * +to_smc_nand_controller(struct nand_hw_control *ctl) +{ + return container_of(to_nand_controller(ctl), + struct atmel_smc_nand_controller, base); +} + +struct atmel_hsmc_nand_controller { + struct atmel_nand_controller base; + struct { + struct gen_pool *pool; + void __iomem *virt; + dma_addr_t dma; + } sram; + const struct atmel_hsmc_reg_layout *hsmc_layout; + struct regmap *io; + struct atmel_nfc_op op; + struct completion complete; + int irq; + + /* Only used when instantiating from legacy DT bindings. */ + struct clk *clk; +}; + +static inline struct atmel_hsmc_nand_controller * +to_hsmc_nand_controller(struct nand_hw_control *ctl) +{ + return container_of(to_nand_controller(ctl), + struct atmel_hsmc_nand_controller, base); +} + +static bool atmel_nfc_op_done(struct atmel_nfc_op *op, u32 status) +{ + op->errors |= status & ATMEL_HSMC_NFC_SR_ERRORS; + op->wait ^= status & op->wait; + + return !op->wait || op->errors; +} + +static irqreturn_t atmel_nfc_interrupt(int irq, void *data) +{ + struct atmel_hsmc_nand_controller *nc = data; + u32 sr, rcvd; + bool done; + + regmap_read(nc->base.smc, ATMEL_HSMC_NFC_SR, &sr); + + rcvd = sr & (nc->op.wait | ATMEL_HSMC_NFC_SR_ERRORS); + done = atmel_nfc_op_done(&nc->op, sr); + + if (rcvd) + regmap_write(nc->base.smc, ATMEL_HSMC_NFC_IDR, rcvd); + + if (done) + complete(&nc->complete); + + return rcvd ? IRQ_HANDLED : IRQ_NONE; +} + +static int atmel_nfc_wait(struct atmel_hsmc_nand_controller *nc, bool poll, + unsigned int timeout_ms) +{ + int ret; + + if (!timeout_ms) + timeout_ms = DEFAULT_TIMEOUT_MS; + + if (poll) { + u32 status; + + ret = regmap_read_poll_timeout(nc->base.smc, + ATMEL_HSMC_NFC_SR, status, + atmel_nfc_op_done(&nc->op, + status), + 0, timeout_ms * 1000); + } else { + init_completion(&nc->complete); + regmap_write(nc->base.smc, ATMEL_HSMC_NFC_IER, + nc->op.wait | ATMEL_HSMC_NFC_SR_ERRORS); + ret = wait_for_completion_timeout(&nc->complete, + msecs_to_jiffies(timeout_ms)); + if (!ret) + ret = -ETIMEDOUT; + else + ret = 0; + + regmap_write(nc->base.smc, ATMEL_HSMC_NFC_IDR, 0xffffffff); + } + + if (nc->op.errors & ATMEL_HSMC_NFC_SR_DTOE) { + dev_err(nc->base.dev, "Waiting NAND R/B Timeout\n"); + ret = -ETIMEDOUT; + } + + if (nc->op.errors & ATMEL_HSMC_NFC_SR_UNDEF) { + dev_err(nc->base.dev, "Access to an undefined area\n"); + ret = -EIO; + } + + if (nc->op.errors & ATMEL_HSMC_NFC_SR_AWB) { + dev_err(nc->base.dev, "Access while busy\n"); + ret = -EIO; + } + + if (nc->op.errors & ATMEL_HSMC_NFC_SR_NFCASE) { + dev_err(nc->base.dev, "Wrong access size\n"); + ret = -EIO; + } + + return ret; +} + +static void atmel_nand_dma_transfer_finished(void *data) +{ + struct completion *finished = data; + + complete(finished); +} + +static int atmel_nand_dma_transfer(struct atmel_nand_controller *nc, + void *buf, dma_addr_t dev_dma, size_t len, + enum dma_data_direction dir) +{ + DECLARE_COMPLETION_ONSTACK(finished); + dma_addr_t src_dma, dst_dma, buf_dma; + struct dma_async_tx_descriptor *tx; + dma_cookie_t cookie; + + buf_dma = dma_map_single(nc->dev, buf, len, dir); + if (dma_mapping_error(nc->dev, dev_dma)) { + dev_err(nc->dev, + "Failed to prepare a buffer for DMA access\n"); + goto err; + } + + if (dir == DMA_FROM_DEVICE) { + src_dma = dev_dma; + dst_dma = buf_dma; + } else { + src_dma = buf_dma; + dst_dma = dev_dma; + } + + tx = dmaengine_prep_dma_memcpy(nc->dmac, dst_dma, src_dma, len, + DMA_CTRL_ACK | DMA_PREP_INTERRUPT); + if (!tx) { + dev_err(nc->dev, "Failed to prepare DMA memcpy\n"); + goto err_unmap; + } + + tx->callback = atmel_nand_dma_transfer_finished; + tx->callback_param = &finished; + + cookie = dmaengine_submit(tx); + if (dma_submit_error(cookie)) { + dev_err(nc->dev, "Failed to do DMA tx_submit\n"); + goto err_unmap; + } + + dma_async_issue_pending(nc->dmac); + wait_for_completion(&finished); + + return 0; + +err_unmap: + dma_unmap_single(nc->dev, buf_dma, len, dir); + +err: + dev_dbg(nc->dev, "Fall back to CPU I/O\n"); + + return -EIO; +} + +static u8 atmel_nand_read_byte(struct mtd_info *mtd) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct atmel_nand *nand = to_atmel_nand(chip); + + return ioread8(nand->activecs->io.virt); +} + +static u16 atmel_nand_read_word(struct mtd_info *mtd) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct atmel_nand *nand = to_atmel_nand(chip); + + return ioread16(nand->activecs->io.virt); +} + +static void atmel_nand_write_byte(struct mtd_info *mtd, u8 byte) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct atmel_nand *nand = to_atmel_nand(chip); + + if (chip->options & NAND_BUSWIDTH_16) + iowrite16(byte | (byte << 8), nand->activecs->io.virt); + else + iowrite8(byte, nand->activecs->io.virt); +} + +static void atmel_nand_read_buf(struct mtd_info *mtd, u8 *buf, int len) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct atmel_nand *nand = to_atmel_nand(chip); + struct atmel_nand_controller *nc; + + nc = to_nand_controller(chip->controller); + + /* + * If the controller supports DMA, the buffer address is DMA-able and + * len is long enough to make DMA transfers profitable, let's trigger + * a DMA transfer. If it fails, fallback to PIO mode. + */ + if (nc->dmac && virt_addr_valid(buf) && + len >= MIN_DMA_LEN && + !atmel_nand_dma_transfer(nc, buf, nand->activecs->io.dma, len, + DMA_FROM_DEVICE)) + return; + + if (chip->options & NAND_BUSWIDTH_16) + ioread16_rep(nand->activecs->io.virt, buf, len / 2); + else + ioread8_rep(nand->activecs->io.virt, buf, len); +} + +static void atmel_nand_write_buf(struct mtd_info *mtd, const u8 *buf, int len) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct atmel_nand *nand = to_atmel_nand(chip); + struct atmel_nand_controller *nc; + + nc = to_nand_controller(chip->controller); + + /* + * If the controller supports DMA, the buffer address is DMA-able and + * len is long enough to make DMA transfers profitable, let's trigger + * a DMA transfer. If it fails, fallback to PIO mode. + */ + if (nc->dmac && virt_addr_valid(buf) && + len >= MIN_DMA_LEN && + !atmel_nand_dma_transfer(nc, (void *)buf, nand->activecs->io.dma, + len, DMA_TO_DEVICE)) + return; + + if (chip->options & NAND_BUSWIDTH_16) + iowrite16_rep(nand->activecs->io.virt, buf, len / 2); + else + iowrite8_rep(nand->activecs->io.virt, buf, len); +} + +static int atmel_nand_dev_ready(struct mtd_info *mtd) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct atmel_nand *nand = to_atmel_nand(chip); + + return gpiod_get_value(nand->activecs->rb.gpio); +} + +static void atmel_nand_select_chip(struct mtd_info *mtd, int cs) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct atmel_nand *nand = to_atmel_nand(chip); + + if (cs < 0 || cs >= nand->numcs) { + nand->activecs = NULL; + chip->dev_ready = NULL; + return; + } + + nand->activecs = &nand->cs[cs]; + + if (nand->activecs->rb.type == ATMEL_NAND_GPIO_RB) + chip->dev_ready = atmel_nand_dev_ready; +} + +static int atmel_hsmc_nand_dev_ready(struct mtd_info *mtd) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct atmel_nand *nand = to_atmel_nand(chip); + struct atmel_hsmc_nand_controller *nc; + u32 status; + + nc = to_hsmc_nand_controller(chip->controller); + + regmap_read(nc->base.smc, ATMEL_HSMC_NFC_SR, &status); + + return status & ATMEL_HSMC_NFC_SR_RBEDGE(nand->activecs->rb.id); +} + +static void atmel_hsmc_nand_select_chip(struct mtd_info *mtd, int cs) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct atmel_nand *nand = to_atmel_nand(chip); + struct atmel_hsmc_nand_controller *nc; + + nc = to_hsmc_nand_controller(chip->controller); + + atmel_nand_select_chip(mtd, cs); + + if (!nand->activecs) { + regmap_write(nc->base.smc, ATMEL_HSMC_NFC_CTRL, + ATMEL_HSMC_NFC_CTRL_DIS); + return; + } + + if (nand->activecs->rb.type == ATMEL_NAND_NATIVE_RB) + chip->dev_ready = atmel_hsmc_nand_dev_ready; + + regmap_update_bits(nc->base.smc, ATMEL_HSMC_NFC_CFG, + ATMEL_HSMC_NFC_CFG_PAGESIZE_MASK | + ATMEL_HSMC_NFC_CFG_SPARESIZE_MASK | + ATMEL_HSMC_NFC_CFG_RSPARE | + ATMEL_HSMC_NFC_CFG_WSPARE, + ATMEL_HSMC_NFC_CFG_PAGESIZE(mtd->writesize) | + ATMEL_HSMC_NFC_CFG_SPARESIZE(mtd->oobsize) | + ATMEL_HSMC_NFC_CFG_RSPARE); + regmap_write(nc->base.smc, ATMEL_HSMC_NFC_CTRL, + ATMEL_HSMC_NFC_CTRL_EN); +} + +static int atmel_nfc_exec_op(struct atmel_hsmc_nand_controller *nc, bool poll) +{ + u8 *addrs = nc->op.addrs; + unsigned int op = 0; + u32 addr, val; + int i, ret; + + nc->op.wait = ATMEL_HSMC_NFC_SR_CMDDONE; + + for (i = 0; i < nc->op.ncmds; i++) + op |= ATMEL_NFC_CMD(i, nc->op.cmds[i]); + + if (nc->op.naddrs == ATMEL_NFC_MAX_ADDR_CYCLES) + regmap_write(nc->base.smc, ATMEL_HSMC_NFC_ADDR, *addrs++); + + op |= ATMEL_NFC_CSID(nc->op.cs) | + ATMEL_NFC_ACYCLE(nc->op.naddrs); + + if (nc->op.ncmds > 1) + op |= ATMEL_NFC_VCMD2; + + addr = addrs[0] | (addrs[1] << 8) | (addrs[2] << 16) | + (addrs[3] << 24); + + if (nc->op.data != ATMEL_NFC_NO_DATA) { + op |= ATMEL_NFC_DATAEN; + nc->op.wait |= ATMEL_HSMC_NFC_SR_XFRDONE; + + if (nc->op.data == ATMEL_NFC_WRITE_DATA) + op |= ATMEL_NFC_NFCWR; + } + + /* Clear all flags. */ + regmap_read(nc->base.smc, ATMEL_HSMC_NFC_SR, &val); + + /* Send the command. */ + regmap_write(nc->io, op, addr); + + ret = atmel_nfc_wait(nc, poll, 0); + if (ret) + dev_err(nc->base.dev, + "Failed to send NAND command (err = %d)!", + ret); + + /* Reset the op state. */ + memset(&nc->op, 0, sizeof(nc->op)); + + return ret; +} + +static void atmel_hsmc_nand_cmd_ctrl(struct mtd_info *mtd, int dat, + unsigned int ctrl) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct atmel_nand *nand = to_atmel_nand(chip); + struct atmel_hsmc_nand_controller *nc; + + nc = to_hsmc_nand_controller(chip->controller); + + if (ctrl & NAND_ALE) { + if (nc->op.naddrs == ATMEL_NFC_MAX_ADDR_CYCLES) + return; + + nc->op.addrs[nc->op.naddrs++] = dat; + } else if (ctrl & NAND_CLE) { + if (nc->op.ncmds > 1) + return; + + nc->op.cmds[nc->op.ncmds++] = dat; + } + + if (dat == NAND_CMD_NONE) { + nc->op.cs = nand->activecs->id; + atmel_nfc_exec_op(nc, true); + } +} + +static void atmel_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, + unsigned int ctrl) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct atmel_nand *nand = to_atmel_nand(chip); + struct atmel_nand_controller *nc; + + nc = to_nand_controller(chip->controller); + + if ((ctrl & NAND_CTRL_CHANGE) && nand->activecs->csgpio) { + if (ctrl & NAND_NCE) + gpiod_set_value(nand->activecs->csgpio, 0); + else + gpiod_set_value(nand->activecs->csgpio, 1); + } + + if (ctrl & NAND_ALE) + writeb(cmd, nand->activecs->io.virt + nc->caps->ale_offs); + else if (ctrl & NAND_CLE) + writeb(cmd, nand->activecs->io.virt + nc->caps->cle_offs); +} + +static void atmel_nfc_copy_to_sram(struct nand_chip *chip, const u8 *buf, + bool oob_required) +{ + struct mtd_info *mtd = nand_to_mtd(chip); + struct atmel_hsmc_nand_controller *nc; + int ret = -EIO; + + nc = to_hsmc_nand_controller(chip->controller); + + if (nc->base.dmac) + ret = atmel_nand_dma_transfer(&nc->base, (void *)buf, + nc->sram.dma, mtd->writesize, + DMA_TO_DEVICE); + + /* Falling back to CPU copy. */ + if (ret) + memcpy_toio(nc->sram.virt, buf, mtd->writesize); + + if (oob_required) + memcpy_toio(nc->sram.virt + mtd->writesize, chip->oob_poi, + mtd->oobsize); +} + +static void atmel_nfc_copy_from_sram(struct nand_chip *chip, u8 *buf, + bool oob_required) +{ + struct mtd_info *mtd = nand_to_mtd(chip); + struct atmel_hsmc_nand_controller *nc; + int ret = -EIO; + + nc = to_hsmc_nand_controller(chip->controller); + + if (nc->base.dmac) + ret = atmel_nand_dma_transfer(&nc->base, buf, nc->sram.dma, + mtd->writesize, DMA_FROM_DEVICE); + + /* Falling back to CPU copy. */ + if (ret) + memcpy_fromio(buf, nc->sram.virt, mtd->writesize); + + if (oob_required) + memcpy_fromio(chip->oob_poi, nc->sram.virt + mtd->writesize, + mtd->oobsize); +} + +static void atmel_nfc_set_op_addr(struct nand_chip *chip, int page, int column) +{ + struct mtd_info *mtd = nand_to_mtd(chip); + struct atmel_hsmc_nand_controller *nc; + + nc = to_hsmc_nand_controller(chip->controller); + + if (column >= 0) { + nc->op.addrs[nc->op.naddrs++] = column; + + /* + * 2 address cycles for the column offset on large page NANDs. + */ + if (mtd->writesize > 512) + nc->op.addrs[nc->op.naddrs++] = column >> 8; + } + + if (page >= 0) { + nc->op.addrs[nc->op.naddrs++] = page; + nc->op.addrs[nc->op.naddrs++] = page >> 8; + + if (chip->options & NAND_ROW_ADDR_3) + nc->op.addrs[nc->op.naddrs++] = page >> 16; + } +} + +static int atmel_nand_pmecc_enable(struct nand_chip *chip, int op, bool raw) +{ + struct atmel_nand *nand = to_atmel_nand(chip); + struct atmel_nand_controller *nc; + int ret; + + nc = to_nand_controller(chip->controller); + + if (raw) + return 0; + + ret = atmel_pmecc_enable(nand->pmecc, op); + if (ret) + dev_err(nc->dev, + "Failed to enable ECC engine (err = %d)\n", ret); + + return ret; +} + +static void atmel_nand_pmecc_disable(struct nand_chip *chip, bool raw) +{ + struct atmel_nand *nand = to_atmel_nand(chip); + + if (!raw) + atmel_pmecc_disable(nand->pmecc); +} + +static int atmel_nand_pmecc_generate_eccbytes(struct nand_chip *chip, bool raw) +{ + struct atmel_nand *nand = to_atmel_nand(chip); + struct mtd_info *mtd = nand_to_mtd(chip); + struct atmel_nand_controller *nc; + struct mtd_oob_region oobregion; + void *eccbuf; + int ret, i; + + nc = to_nand_controller(chip->controller); + + if (raw) + return 0; + + ret = atmel_pmecc_wait_rdy(nand->pmecc); + if (ret) { + dev_err(nc->dev, + "Failed to transfer NAND page data (err = %d)\n", + ret); + return ret; + } + + mtd_ooblayout_ecc(mtd, 0, &oobregion); + eccbuf = chip->oob_poi + oobregion.offset; + + for (i = 0; i < chip->ecc.steps; i++) { + atmel_pmecc_get_generated_eccbytes(nand->pmecc, i, + eccbuf); + eccbuf += chip->ecc.bytes; + } + + return 0; +} + +static int atmel_nand_pmecc_correct_data(struct nand_chip *chip, void *buf, + bool raw) +{ + struct atmel_nand *nand = to_atmel_nand(chip); + struct mtd_info *mtd = nand_to_mtd(chip); + struct atmel_nand_controller *nc; + struct mtd_oob_region oobregion; + int ret, i, max_bitflips = 0; + void *databuf, *eccbuf; + + nc = to_nand_controller(chip->controller); + + if (raw) + return 0; + + ret = atmel_pmecc_wait_rdy(nand->pmecc); + if (ret) { + dev_err(nc->dev, + "Failed to read NAND page data (err = %d)\n", + ret); + return ret; + } + + mtd_ooblayout_ecc(mtd, 0, &oobregion); + eccbuf = chip->oob_poi + oobregion.offset; + databuf = buf; + + for (i = 0; i < chip->ecc.steps; i++) { + ret = atmel_pmecc_correct_sector(nand->pmecc, i, databuf, + eccbuf); + if (ret < 0 && !atmel_pmecc_correct_erased_chunks(nand->pmecc)) + ret = nand_check_erased_ecc_chunk(databuf, + chip->ecc.size, + eccbuf, + chip->ecc.bytes, + NULL, 0, + chip->ecc.strength); + + if (ret >= 0) + max_bitflips = max(ret, max_bitflips); + else + mtd->ecc_stats.failed++; + + databuf += chip->ecc.size; + eccbuf += chip->ecc.bytes; + } + + return max_bitflips; +} + +static int atmel_nand_pmecc_write_pg(struct nand_chip *chip, const u8 *buf, + bool oob_required, int page, bool raw) +{ + struct mtd_info *mtd = nand_to_mtd(chip); + struct atmel_nand *nand = to_atmel_nand(chip); + int ret; + + nand_prog_page_begin_op(chip, page, 0, NULL, 0); + + ret = atmel_nand_pmecc_enable(chip, NAND_ECC_WRITE, raw); + if (ret) + return ret; + + atmel_nand_write_buf(mtd, buf, mtd->writesize); + + ret = atmel_nand_pmecc_generate_eccbytes(chip, raw); + if (ret) { + atmel_pmecc_disable(nand->pmecc); + return ret; + } + + atmel_nand_pmecc_disable(chip, raw); + + atmel_nand_write_buf(mtd, chip->oob_poi, mtd->oobsize); + + return nand_prog_page_end_op(chip); +} + +static int atmel_nand_pmecc_write_page(struct mtd_info *mtd, + struct nand_chip *chip, const u8 *buf, + int oob_required, int page) +{ + return atmel_nand_pmecc_write_pg(chip, buf, oob_required, page, false); +} + +static int atmel_nand_pmecc_write_page_raw(struct mtd_info *mtd, + struct nand_chip *chip, + const u8 *buf, int oob_required, + int page) +{ + return atmel_nand_pmecc_write_pg(chip, buf, oob_required, page, true); +} + +static int atmel_nand_pmecc_read_pg(struct nand_chip *chip, u8 *buf, + bool oob_required, int page, bool raw) +{ + struct mtd_info *mtd = nand_to_mtd(chip); + int ret; + + nand_read_page_op(chip, page, 0, NULL, 0); + + ret = atmel_nand_pmecc_enable(chip, NAND_ECC_READ, raw); + if (ret) + return ret; + + atmel_nand_read_buf(mtd, buf, mtd->writesize); + atmel_nand_read_buf(mtd, chip->oob_poi, mtd->oobsize); + + ret = atmel_nand_pmecc_correct_data(chip, buf, raw); + + atmel_nand_pmecc_disable(chip, raw); + + return ret; +} + +static int atmel_nand_pmecc_read_page(struct mtd_info *mtd, + struct nand_chip *chip, u8 *buf, + int oob_required, int page) +{ + return atmel_nand_pmecc_read_pg(chip, buf, oob_required, page, false); +} + +static int atmel_nand_pmecc_read_page_raw(struct mtd_info *mtd, + struct nand_chip *chip, u8 *buf, + int oob_required, int page) +{ + return atmel_nand_pmecc_read_pg(chip, buf, oob_required, page, true); +} + +static int atmel_hsmc_nand_pmecc_write_pg(struct nand_chip *chip, + const u8 *buf, bool oob_required, + int page, bool raw) +{ + struct mtd_info *mtd = nand_to_mtd(chip); + struct atmel_nand *nand = to_atmel_nand(chip); + struct atmel_hsmc_nand_controller *nc; + int ret, status; + + nc = to_hsmc_nand_controller(chip->controller); + + atmel_nfc_copy_to_sram(chip, buf, false); + + nc->op.cmds[0] = NAND_CMD_SEQIN; + nc->op.ncmds = 1; + atmel_nfc_set_op_addr(chip, page, 0x0); + nc->op.cs = nand->activecs->id; + nc->op.data = ATMEL_NFC_WRITE_DATA; + + ret = atmel_nand_pmecc_enable(chip, NAND_ECC_WRITE, raw); + if (ret) + return ret; + + ret = atmel_nfc_exec_op(nc, false); + if (ret) { + atmel_nand_pmecc_disable(chip, raw); + dev_err(nc->base.dev, + "Failed to transfer NAND page data (err = %d)\n", + ret); + return ret; + } + + ret = atmel_nand_pmecc_generate_eccbytes(chip, raw); + + atmel_nand_pmecc_disable(chip, raw); + + if (ret) + return ret; + + atmel_nand_write_buf(mtd, chip->oob_poi, mtd->oobsize); + + nc->op.cmds[0] = NAND_CMD_PAGEPROG; + nc->op.ncmds = 1; + nc->op.cs = nand->activecs->id; + ret = atmel_nfc_exec_op(nc, false); + if (ret) + dev_err(nc->base.dev, "Failed to program NAND page (err = %d)\n", + ret); + + status = chip->waitfunc(mtd, chip); + if (status & NAND_STATUS_FAIL) + return -EIO; + + return ret; +} + +static int atmel_hsmc_nand_pmecc_write_page(struct mtd_info *mtd, + struct nand_chip *chip, + const u8 *buf, int oob_required, + int page) +{ + return atmel_hsmc_nand_pmecc_write_pg(chip, buf, oob_required, page, + false); +} + +static int atmel_hsmc_nand_pmecc_write_page_raw(struct mtd_info *mtd, + struct nand_chip *chip, + const u8 *buf, + int oob_required, int page) +{ + return atmel_hsmc_nand_pmecc_write_pg(chip, buf, oob_required, page, + true); +} + +static int atmel_hsmc_nand_pmecc_read_pg(struct nand_chip *chip, u8 *buf, + bool oob_required, int page, + bool raw) +{ + struct mtd_info *mtd = nand_to_mtd(chip); + struct atmel_nand *nand = to_atmel_nand(chip); + struct atmel_hsmc_nand_controller *nc; + int ret; + + nc = to_hsmc_nand_controller(chip->controller); + + /* + * Optimized read page accessors only work when the NAND R/B pin is + * connected to a native SoC R/B pin. If that's not the case, fallback + * to the non-optimized one. + */ + if (nand->activecs->rb.type != ATMEL_NAND_NATIVE_RB) { + nand_read_page_op(chip, page, 0, NULL, 0); + + return atmel_nand_pmecc_read_pg(chip, buf, oob_required, page, + raw); + } + + nc->op.cmds[nc->op.ncmds++] = NAND_CMD_READ0; + + if (mtd->writesize > 512) + nc->op.cmds[nc->op.ncmds++] = NAND_CMD_READSTART; + + atmel_nfc_set_op_addr(chip, page, 0x0); + nc->op.cs = nand->activecs->id; + nc->op.data = ATMEL_NFC_READ_DATA; + + ret = atmel_nand_pmecc_enable(chip, NAND_ECC_READ, raw); + if (ret) + return ret; + + ret = atmel_nfc_exec_op(nc, false); + if (ret) { + atmel_nand_pmecc_disable(chip, raw); + dev_err(nc->base.dev, + "Failed to load NAND page data (err = %d)\n", + ret); + return ret; + } + + atmel_nfc_copy_from_sram(chip, buf, true); + + ret = atmel_nand_pmecc_correct_data(chip, buf, raw); + + atmel_nand_pmecc_disable(chip, raw); + + return ret; +} + +static int atmel_hsmc_nand_pmecc_read_page(struct mtd_info *mtd, + struct nand_chip *chip, u8 *buf, + int oob_required, int page) +{ + return atmel_hsmc_nand_pmecc_read_pg(chip, buf, oob_required, page, + false); +} + +static int atmel_hsmc_nand_pmecc_read_page_raw(struct mtd_info *mtd, + struct nand_chip *chip, + u8 *buf, int oob_required, + int page) +{ + return atmel_hsmc_nand_pmecc_read_pg(chip, buf, oob_required, page, + true); +} + +static int atmel_nand_pmecc_init(struct nand_chip *chip) +{ + struct mtd_info *mtd = nand_to_mtd(chip); + struct atmel_nand *nand = to_atmel_nand(chip); + struct atmel_nand_controller *nc; + struct atmel_pmecc_user_req req; + + nc = to_nand_controller(chip->controller); + + if (!nc->pmecc) { + dev_err(nc->dev, "HW ECC not supported\n"); + return -ENOTSUPP; + } + + if (nc->caps->legacy_of_bindings) { + u32 val; + + if (!of_property_read_u32(nc->dev->of_node, "atmel,pmecc-cap", + &val)) + chip->ecc.strength = val; + + if (!of_property_read_u32(nc->dev->of_node, + "atmel,pmecc-sector-size", + &val)) + chip->ecc.size = val; + } + + if (chip->ecc.options & NAND_ECC_MAXIMIZE) + req.ecc.strength = ATMEL_PMECC_MAXIMIZE_ECC_STRENGTH; + else if (chip->ecc.strength) + req.ecc.strength = chip->ecc.strength; + else if (chip->ecc_strength_ds) + req.ecc.strength = chip->ecc_strength_ds; + else + req.ecc.strength = ATMEL_PMECC_MAXIMIZE_ECC_STRENGTH; + + if (chip->ecc.size) + req.ecc.sectorsize = chip->ecc.size; + else if (chip->ecc_step_ds) + req.ecc.sectorsize = chip->ecc_step_ds; + else + req.ecc.sectorsize = ATMEL_PMECC_SECTOR_SIZE_AUTO; + + req.pagesize = mtd->writesize; + req.oobsize = mtd->oobsize; + + if (mtd->writesize <= 512) { + req.ecc.bytes = 4; + req.ecc.ooboffset = 0; + } else { + req.ecc.bytes = mtd->oobsize - 2; + req.ecc.ooboffset = ATMEL_PMECC_OOBOFFSET_AUTO; + } + + nand->pmecc = atmel_pmecc_create_user(nc->pmecc, &req); + if (IS_ERR(nand->pmecc)) + return PTR_ERR(nand->pmecc); + + chip->ecc.algo = NAND_ECC_BCH; + chip->ecc.size = req.ecc.sectorsize; + chip->ecc.bytes = req.ecc.bytes / req.ecc.nsectors; + chip->ecc.strength = req.ecc.strength; + + chip->options |= NAND_NO_SUBPAGE_WRITE; + + mtd_set_ooblayout(mtd, &nand_ooblayout_lp_ops); + + return 0; +} + +static int atmel_nand_ecc_init(struct atmel_nand *nand) +{ + struct nand_chip *chip = &nand->base; + struct atmel_nand_controller *nc; + int ret; + + nc = to_nand_controller(chip->controller); + + switch (chip->ecc.mode) { + case NAND_ECC_NONE: + case NAND_ECC_SOFT: + /* + * Nothing to do, the core will initialize everything for us. + */ + break; + + case NAND_ECC_HW: + ret = atmel_nand_pmecc_init(chip); + if (ret) + return ret; + + chip->ecc.read_page = atmel_nand_pmecc_read_page; + chip->ecc.write_page = atmel_nand_pmecc_write_page; + chip->ecc.read_page_raw = atmel_nand_pmecc_read_page_raw; + chip->ecc.write_page_raw = atmel_nand_pmecc_write_page_raw; + break; + + default: + /* Other modes are not supported. */ + dev_err(nc->dev, "Unsupported ECC mode: %d\n", + chip->ecc.mode); + return -ENOTSUPP; + } + + return 0; +} + +static int atmel_hsmc_nand_ecc_init(struct atmel_nand *nand) +{ + struct nand_chip *chip = &nand->base; + int ret; + + ret = atmel_nand_ecc_init(nand); + if (ret) + return ret; + + if (chip->ecc.mode != NAND_ECC_HW) + return 0; + + /* Adjust the ECC operations for the HSMC IP. */ + chip->ecc.read_page = atmel_hsmc_nand_pmecc_read_page; + chip->ecc.write_page = atmel_hsmc_nand_pmecc_write_page; + chip->ecc.read_page_raw = atmel_hsmc_nand_pmecc_read_page_raw; + chip->ecc.write_page_raw = atmel_hsmc_nand_pmecc_write_page_raw; + + return 0; +} + +static int atmel_smc_nand_prepare_smcconf(struct atmel_nand *nand, + const struct nand_data_interface *conf, + struct atmel_smc_cs_conf *smcconf) +{ + u32 ncycles, totalcycles, timeps, mckperiodps; + struct atmel_nand_controller *nc; + int ret; + + nc = to_nand_controller(nand->base.controller); + + /* DDR interface not supported. */ + if (conf->type != NAND_SDR_IFACE) + return -ENOTSUPP; + + /* + * tRC < 30ns implies EDO mode. This controller does not support this + * mode. + */ + if (conf->timings.sdr.tRC_min < 30000) + return -ENOTSUPP; + + atmel_smc_cs_conf_init(smcconf); + + mckperiodps = NSEC_PER_SEC / clk_get_rate(nc->mck); + mckperiodps *= 1000; + + /* + * Set write pulse timing. This one is easy to extract: + * + * NWE_PULSE = tWP + */ + ncycles = DIV_ROUND_UP(conf->timings.sdr.tWP_min, mckperiodps); + totalcycles = ncycles; + ret = atmel_smc_cs_conf_set_pulse(smcconf, ATMEL_SMC_NWE_SHIFT, + ncycles); + if (ret) + return ret; + + /* + * The write setup timing depends on the operation done on the NAND. + * All operations goes through the same data bus, but the operation + * type depends on the address we are writing to (ALE/CLE address + * lines). + * Since we have no way to differentiate the different operations at + * the SMC level, we must consider the worst case (the biggest setup + * time among all operation types): + * + * NWE_SETUP = max(tCLS, tCS, tALS, tDS) - NWE_PULSE + */ + timeps = max3(conf->timings.sdr.tCLS_min, conf->timings.sdr.tCS_min, + conf->timings.sdr.tALS_min); + timeps = max(timeps, conf->timings.sdr.tDS_min); + ncycles = DIV_ROUND_UP(timeps, mckperiodps); + ncycles = ncycles > totalcycles ? ncycles - totalcycles : 0; + totalcycles += ncycles; + ret = atmel_smc_cs_conf_set_setup(smcconf, ATMEL_SMC_NWE_SHIFT, + ncycles); + if (ret) + return ret; + + /* + * As for the write setup timing, the write hold timing depends on the + * operation done on the NAND: + * + * NWE_HOLD = max(tCLH, tCH, tALH, tDH, tWH) + */ + timeps = max3(conf->timings.sdr.tCLH_min, conf->timings.sdr.tCH_min, + conf->timings.sdr.tALH_min); + timeps = max3(timeps, conf->timings.sdr.tDH_min, + conf->timings.sdr.tWH_min); + ncycles = DIV_ROUND_UP(timeps, mckperiodps); + totalcycles += ncycles; + + /* + * The write cycle timing is directly matching tWC, but is also + * dependent on the other timings on the setup and hold timings we + * calculated earlier, which gives: + * + * NWE_CYCLE = max(tWC, NWE_SETUP + NWE_PULSE + NWE_HOLD) + */ + ncycles = DIV_ROUND_UP(conf->timings.sdr.tWC_min, mckperiodps); + ncycles = max(totalcycles, ncycles); + ret = atmel_smc_cs_conf_set_cycle(smcconf, ATMEL_SMC_NWE_SHIFT, + ncycles); + if (ret) + return ret; + + /* + * We don't want the CS line to be toggled between each byte/word + * transfer to the NAND. The only way to guarantee that is to have the + * NCS_{WR,RD}_{SETUP,HOLD} timings set to 0, which in turn means: + * + * NCS_WR_PULSE = NWE_CYCLE + */ + ret = atmel_smc_cs_conf_set_pulse(smcconf, ATMEL_SMC_NCS_WR_SHIFT, + ncycles); + if (ret) + return ret; + + /* + * As for the write setup timing, the read hold timing depends on the + * operation done on the NAND: + * + * NRD_HOLD = max(tREH, tRHOH) + */ + timeps = max(conf->timings.sdr.tREH_min, conf->timings.sdr.tRHOH_min); + ncycles = DIV_ROUND_UP(timeps, mckperiodps); + totalcycles = ncycles; + + /* + * TDF = tRHZ - NRD_HOLD + */ + ncycles = DIV_ROUND_UP(conf->timings.sdr.tRHZ_max, mckperiodps); + ncycles -= totalcycles; + + /* + * In ONFI 4.0 specs, tRHZ has been increased to support EDO NANDs and + * we might end up with a config that does not fit in the TDF field. + * Just take the max value in this case and hope that the NAND is more + * tolerant than advertised. + */ + if (ncycles > ATMEL_SMC_MODE_TDF_MAX) + ncycles = ATMEL_SMC_MODE_TDF_MAX; + else if (ncycles < ATMEL_SMC_MODE_TDF_MIN) + ncycles = ATMEL_SMC_MODE_TDF_MIN; + + smcconf->mode |= ATMEL_SMC_MODE_TDF(ncycles) | + ATMEL_SMC_MODE_TDFMODE_OPTIMIZED; + + /* + * Read pulse timing directly matches tRP: + * + * NRD_PULSE = tRP + */ + ncycles = DIV_ROUND_UP(conf->timings.sdr.tRP_min, mckperiodps); + totalcycles += ncycles; + ret = atmel_smc_cs_conf_set_pulse(smcconf, ATMEL_SMC_NRD_SHIFT, + ncycles); + if (ret) + return ret; + + /* + * The write cycle timing is directly matching tWC, but is also + * dependent on the setup and hold timings we calculated earlier, + * which gives: + * + * NRD_CYCLE = max(tRC, NRD_PULSE + NRD_HOLD) + * + * NRD_SETUP is always 0. + */ + ncycles = DIV_ROUND_UP(conf->timings.sdr.tRC_min, mckperiodps); + ncycles = max(totalcycles, ncycles); + ret = atmel_smc_cs_conf_set_cycle(smcconf, ATMEL_SMC_NRD_SHIFT, + ncycles); + if (ret) + return ret; + + /* + * We don't want the CS line to be toggled between each byte/word + * transfer from the NAND. The only way to guarantee that is to have + * the NCS_{WR,RD}_{SETUP,HOLD} timings set to 0, which in turn means: + * + * NCS_RD_PULSE = NRD_CYCLE + */ + ret = atmel_smc_cs_conf_set_pulse(smcconf, ATMEL_SMC_NCS_RD_SHIFT, + ncycles); + if (ret) + return ret; + + /* Txxx timings are directly matching tXXX ones. */ + ncycles = DIV_ROUND_UP(conf->timings.sdr.tCLR_min, mckperiodps); + ret = atmel_smc_cs_conf_set_timing(smcconf, + ATMEL_HSMC_TIMINGS_TCLR_SHIFT, + ncycles); + if (ret) + return ret; + + ncycles = DIV_ROUND_UP(conf->timings.sdr.tADL_min, mckperiodps); + ret = atmel_smc_cs_conf_set_timing(smcconf, + ATMEL_HSMC_TIMINGS_TADL_SHIFT, + ncycles); + /* + * Version 4 of the ONFI spec mandates that tADL be at least 400 + * nanoseconds, but, depending on the master clock rate, 400 ns may not + * fit in the tADL field of the SMC reg. We need to relax the check and + * accept the -ERANGE return code. + * + * Note that previous versions of the ONFI spec had a lower tADL_min + * (100 or 200 ns). It's not clear why this timing constraint got + * increased but it seems most NANDs are fine with values lower than + * 400ns, so we should be safe. + */ + if (ret && ret != -ERANGE) + return ret; + + ncycles = DIV_ROUND_UP(conf->timings.sdr.tAR_min, mckperiodps); + ret = atmel_smc_cs_conf_set_timing(smcconf, + ATMEL_HSMC_TIMINGS_TAR_SHIFT, + ncycles); + if (ret) + return ret; + + ncycles = DIV_ROUND_UP(conf->timings.sdr.tRR_min, mckperiodps); + ret = atmel_smc_cs_conf_set_timing(smcconf, + ATMEL_HSMC_TIMINGS_TRR_SHIFT, + ncycles); + if (ret) + return ret; + + ncycles = DIV_ROUND_UP(conf->timings.sdr.tWB_max, mckperiodps); + ret = atmel_smc_cs_conf_set_timing(smcconf, + ATMEL_HSMC_TIMINGS_TWB_SHIFT, + ncycles); + if (ret) + return ret; + + /* Attach the CS line to the NFC logic. */ + smcconf->timings |= ATMEL_HSMC_TIMINGS_NFSEL; + + /* Set the appropriate data bus width. */ + if (nand->base.options & NAND_BUSWIDTH_16) + smcconf->mode |= ATMEL_SMC_MODE_DBW_16; + + /* Operate in NRD/NWE READ/WRITEMODE. */ + smcconf->mode |= ATMEL_SMC_MODE_READMODE_NRD | + ATMEL_SMC_MODE_WRITEMODE_NWE; + + return 0; +} + +static int atmel_smc_nand_setup_data_interface(struct atmel_nand *nand, + int csline, + const struct nand_data_interface *conf) +{ + struct atmel_nand_controller *nc; + struct atmel_smc_cs_conf smcconf; + struct atmel_nand_cs *cs; + int ret; + + nc = to_nand_controller(nand->base.controller); + + ret = atmel_smc_nand_prepare_smcconf(nand, conf, &smcconf); + if (ret) + return ret; + + if (csline == NAND_DATA_IFACE_CHECK_ONLY) + return 0; + + cs = &nand->cs[csline]; + cs->smcconf = smcconf; + atmel_smc_cs_conf_apply(nc->smc, cs->id, &cs->smcconf); + + return 0; +} + +static int atmel_hsmc_nand_setup_data_interface(struct atmel_nand *nand, + int csline, + const struct nand_data_interface *conf) +{ + struct atmel_hsmc_nand_controller *nc; + struct atmel_smc_cs_conf smcconf; + struct atmel_nand_cs *cs; + int ret; + + nc = to_hsmc_nand_controller(nand->base.controller); + + ret = atmel_smc_nand_prepare_smcconf(nand, conf, &smcconf); + if (ret) + return ret; + + if (csline == NAND_DATA_IFACE_CHECK_ONLY) + return 0; + + cs = &nand->cs[csline]; + cs->smcconf = smcconf; + + if (cs->rb.type == ATMEL_NAND_NATIVE_RB) + cs->smcconf.timings |= ATMEL_HSMC_TIMINGS_RBNSEL(cs->rb.id); + + atmel_hsmc_cs_conf_apply(nc->base.smc, nc->hsmc_layout, cs->id, + &cs->smcconf); + + return 0; +} + +static int atmel_nand_setup_data_interface(struct mtd_info *mtd, int csline, + const struct nand_data_interface *conf) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct atmel_nand *nand = to_atmel_nand(chip); + struct atmel_nand_controller *nc; + + nc = to_nand_controller(nand->base.controller); + + if (csline >= nand->numcs || + (csline < 0 && csline != NAND_DATA_IFACE_CHECK_ONLY)) + return -EINVAL; + + return nc->caps->ops->setup_data_interface(nand, csline, conf); +} + +static void atmel_nand_init(struct atmel_nand_controller *nc, + struct atmel_nand *nand) +{ + struct nand_chip *chip = &nand->base; + struct mtd_info *mtd = nand_to_mtd(chip); + + mtd->dev.parent = nc->dev; + nand->base.controller = &nc->base; + + chip->cmd_ctrl = atmel_nand_cmd_ctrl; + chip->read_byte = atmel_nand_read_byte; + chip->read_word = atmel_nand_read_word; + chip->write_byte = atmel_nand_write_byte; + chip->read_buf = atmel_nand_read_buf; + chip->write_buf = atmel_nand_write_buf; + chip->select_chip = atmel_nand_select_chip; + + if (nc->mck && nc->caps->ops->setup_data_interface) + chip->setup_data_interface = atmel_nand_setup_data_interface; + + /* Some NANDs require a longer delay than the default one (20us). */ + chip->chip_delay = 40; + + /* + * Use a bounce buffer when the buffer passed by the MTD user is not + * suitable for DMA. + */ + if (nc->dmac) + chip->options |= NAND_USE_BOUNCE_BUFFER; + + /* Default to HW ECC if pmecc is available. */ + if (nc->pmecc) + chip->ecc.mode = NAND_ECC_HW; +} + +static void atmel_smc_nand_init(struct atmel_nand_controller *nc, + struct atmel_nand *nand) +{ + struct nand_chip *chip = &nand->base; + struct atmel_smc_nand_controller *smc_nc; + int i; + + atmel_nand_init(nc, nand); + + smc_nc = to_smc_nand_controller(chip->controller); + if (!smc_nc->matrix) + return; + + /* Attach the CS to the NAND Flash logic. */ + for (i = 0; i < nand->numcs; i++) + regmap_update_bits(smc_nc->matrix, smc_nc->ebi_csa_offs, + BIT(nand->cs[i].id), BIT(nand->cs[i].id)); +} + +static void atmel_hsmc_nand_init(struct atmel_nand_controller *nc, + struct atmel_nand *nand) +{ + struct nand_chip *chip = &nand->base; + + atmel_nand_init(nc, nand); + + /* Overload some methods for the HSMC controller. */ + chip->cmd_ctrl = atmel_hsmc_nand_cmd_ctrl; + chip->select_chip = atmel_hsmc_nand_select_chip; +} + +static int atmel_nand_detect(struct atmel_nand *nand) +{ + struct nand_chip *chip = &nand->base; + struct mtd_info *mtd = nand_to_mtd(chip); + struct atmel_nand_controller *nc; + int ret; + + nc = to_nand_controller(chip->controller); + + ret = nand_scan_ident(mtd, nand->numcs, NULL); + if (ret) + dev_err(nc->dev, "nand_scan_ident() failed: %d\n", ret); + + return ret; +} + +static int atmel_nand_unregister(struct atmel_nand *nand) +{ + struct nand_chip *chip = &nand->base; + struct mtd_info *mtd = nand_to_mtd(chip); + int ret; + + ret = mtd_device_unregister(mtd); + if (ret) + return ret; + + nand_cleanup(chip); + list_del(&nand->node); + + return 0; +} + +static int atmel_nand_register(struct atmel_nand *nand) +{ + struct nand_chip *chip = &nand->base; + struct mtd_info *mtd = nand_to_mtd(chip); + struct atmel_nand_controller *nc; + int ret; + + nc = to_nand_controller(chip->controller); + + if (nc->caps->legacy_of_bindings || !nc->dev->of_node) { + /* + * We keep the MTD name unchanged to avoid breaking platforms + * where the MTD cmdline parser is used and the bootloader + * has not been updated to use the new naming scheme. + */ + mtd->name = "atmel_nand"; + } else if (!mtd->name) { + /* + * If the new bindings are used and the bootloader has not been + * updated to pass a new mtdparts parameter on the cmdline, you + * should define the following property in your nand node: + * + * label = "atmel_nand"; + * + * This way, mtd->name will be set by the core when + * nand_set_flash_node() is called. + */ + mtd->name = devm_kasprintf(nc->dev, GFP_KERNEL, + "%s:nand.%d", dev_name(nc->dev), + nand->cs[0].id); + if (!mtd->name) { + dev_err(nc->dev, "Failed to allocate mtd->name\n"); + return -ENOMEM; + } + } + + ret = nand_scan_tail(mtd); + if (ret) { + dev_err(nc->dev, "nand_scan_tail() failed: %d\n", ret); + return ret; + } + + ret = mtd_device_register(mtd, NULL, 0); + if (ret) { + dev_err(nc->dev, "Failed to register mtd device: %d\n", ret); + nand_cleanup(chip); + return ret; + } + + list_add_tail(&nand->node, &nc->chips); + + return 0; +} + +static struct atmel_nand *atmel_nand_create(struct atmel_nand_controller *nc, + struct device_node *np, + int reg_cells) +{ + struct atmel_nand *nand; + struct gpio_desc *gpio; + int numcs, ret, i; + + numcs = of_property_count_elems_of_size(np, "reg", + reg_cells * sizeof(u32)); + if (numcs < 1) { + dev_err(nc->dev, "Missing or invalid reg property\n"); + return ERR_PTR(-EINVAL); + } + + nand = devm_kzalloc(nc->dev, + sizeof(*nand) + (numcs * sizeof(*nand->cs)), + GFP_KERNEL); + if (!nand) { + dev_err(nc->dev, "Failed to allocate NAND object\n"); + return ERR_PTR(-ENOMEM); + } + + nand->numcs = numcs; + + gpio = devm_fwnode_get_index_gpiod_from_child(nc->dev, "det", 0, + &np->fwnode, GPIOD_IN, + "nand-det"); + if (IS_ERR(gpio) && PTR_ERR(gpio) != -ENOENT) { + dev_err(nc->dev, + "Failed to get detect gpio (err = %ld)\n", + PTR_ERR(gpio)); + return ERR_CAST(gpio); + } + + if (!IS_ERR(gpio)) + nand->cdgpio = gpio; + + for (i = 0; i < numcs; i++) { + struct resource res; + u32 val; + + ret = of_address_to_resource(np, 0, &res); + if (ret) { + dev_err(nc->dev, "Invalid reg property (err = %d)\n", + ret); + return ERR_PTR(ret); + } + + ret = of_property_read_u32_index(np, "reg", i * reg_cells, + &val); + if (ret) { + dev_err(nc->dev, "Invalid reg property (err = %d)\n", + ret); + return ERR_PTR(ret); + } + + nand->cs[i].id = val; + + nand->cs[i].io.dma = res.start; + nand->cs[i].io.virt = devm_ioremap_resource(nc->dev, &res); + if (IS_ERR(nand->cs[i].io.virt)) + return ERR_CAST(nand->cs[i].io.virt); + + if (!of_property_read_u32(np, "atmel,rb", &val)) { + if (val > ATMEL_NFC_MAX_RB_ID) + return ERR_PTR(-EINVAL); + + nand->cs[i].rb.type = ATMEL_NAND_NATIVE_RB; + nand->cs[i].rb.id = val; + } else { + gpio = devm_fwnode_get_index_gpiod_from_child(nc->dev, + "rb", i, &np->fwnode, + GPIOD_IN, "nand-rb"); + if (IS_ERR(gpio) && PTR_ERR(gpio) != -ENOENT) { + dev_err(nc->dev, + "Failed to get R/B gpio (err = %ld)\n", + PTR_ERR(gpio)); + return ERR_CAST(gpio); + } + + if (!IS_ERR(gpio)) { + nand->cs[i].rb.type = ATMEL_NAND_GPIO_RB; + nand->cs[i].rb.gpio = gpio; + } + } + + gpio = devm_fwnode_get_index_gpiod_from_child(nc->dev, "cs", + i, &np->fwnode, + GPIOD_OUT_HIGH, + "nand-cs"); + if (IS_ERR(gpio) && PTR_ERR(gpio) != -ENOENT) { + dev_err(nc->dev, + "Failed to get CS gpio (err = %ld)\n", + PTR_ERR(gpio)); + return ERR_CAST(gpio); + } + + if (!IS_ERR(gpio)) + nand->cs[i].csgpio = gpio; + } + + nand_set_flash_node(&nand->base, np); + + return nand; +} + +static int +atmel_nand_controller_add_nand(struct atmel_nand_controller *nc, + struct atmel_nand *nand) +{ + int ret; + + /* No card inserted, skip this NAND. */ + if (nand->cdgpio && gpiod_get_value(nand->cdgpio)) { + dev_info(nc->dev, "No SmartMedia card inserted.\n"); + return 0; + } + + nc->caps->ops->nand_init(nc, nand); + + ret = atmel_nand_detect(nand); + if (ret) + return ret; + + ret = nc->caps->ops->ecc_init(nand); + if (ret) + return ret; + + return atmel_nand_register(nand); +} + +static int +atmel_nand_controller_remove_nands(struct atmel_nand_controller *nc) +{ + struct atmel_nand *nand, *tmp; + int ret; + + list_for_each_entry_safe(nand, tmp, &nc->chips, node) { + ret = atmel_nand_unregister(nand); + if (ret) + return ret; + } + + return 0; +} + +static int +atmel_nand_controller_legacy_add_nands(struct atmel_nand_controller *nc) +{ + struct device *dev = nc->dev; + struct platform_device *pdev = to_platform_device(dev); + struct atmel_nand *nand; + struct gpio_desc *gpio; + struct resource *res; + + /* + * Legacy bindings only allow connecting a single NAND with a unique CS + * line to the controller. + */ + nand = devm_kzalloc(nc->dev, sizeof(*nand) + sizeof(*nand->cs), + GFP_KERNEL); + if (!nand) + return -ENOMEM; + + nand->numcs = 1; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + nand->cs[0].io.virt = devm_ioremap_resource(dev, res); + if (IS_ERR(nand->cs[0].io.virt)) + return PTR_ERR(nand->cs[0].io.virt); + + nand->cs[0].io.dma = res->start; + + /* + * The old driver was hardcoding the CS id to 3 for all sama5 + * controllers. Since this id is only meaningful for the sama5 + * controller we can safely assign this id to 3 no matter the + * controller. + * If one wants to connect a NAND to a different CS line, he will + * have to use the new bindings. + */ + nand->cs[0].id = 3; + + /* R/B GPIO. */ + gpio = devm_gpiod_get_index_optional(dev, NULL, 0, GPIOD_IN); + if (IS_ERR(gpio)) { + dev_err(dev, "Failed to get R/B gpio (err = %ld)\n", + PTR_ERR(gpio)); + return PTR_ERR(gpio); + } + + if (gpio) { + nand->cs[0].rb.type = ATMEL_NAND_GPIO_RB; + nand->cs[0].rb.gpio = gpio; + } + + /* CS GPIO. */ + gpio = devm_gpiod_get_index_optional(dev, NULL, 1, GPIOD_OUT_HIGH); + if (IS_ERR(gpio)) { + dev_err(dev, "Failed to get CS gpio (err = %ld)\n", + PTR_ERR(gpio)); + return PTR_ERR(gpio); + } + + nand->cs[0].csgpio = gpio; + + /* Card detect GPIO. */ + gpio = devm_gpiod_get_index_optional(nc->dev, NULL, 2, GPIOD_IN); + if (IS_ERR(gpio)) { + dev_err(dev, + "Failed to get detect gpio (err = %ld)\n", + PTR_ERR(gpio)); + return PTR_ERR(gpio); + } + + nand->cdgpio = gpio; + + nand_set_flash_node(&nand->base, nc->dev->of_node); + + return atmel_nand_controller_add_nand(nc, nand); +} + +static int atmel_nand_controller_add_nands(struct atmel_nand_controller *nc) +{ + struct device_node *np, *nand_np; + struct device *dev = nc->dev; + int ret, reg_cells; + u32 val; + + /* We do not retrieve the SMC syscon when parsing old DTs. */ + if (nc->caps->legacy_of_bindings) + return atmel_nand_controller_legacy_add_nands(nc); + + np = dev->of_node; + + ret = of_property_read_u32(np, "#address-cells", &val); + if (ret) { + dev_err(dev, "missing #address-cells property\n"); + return ret; + } + + reg_cells = val; + + ret = of_property_read_u32(np, "#size-cells", &val); + if (ret) { + dev_err(dev, "missing #address-cells property\n"); + return ret; + } + + reg_cells += val; + + for_each_child_of_node(np, nand_np) { + struct atmel_nand *nand; + + nand = atmel_nand_create(nc, nand_np, reg_cells); + if (IS_ERR(nand)) { + ret = PTR_ERR(nand); + goto err; + } + + ret = atmel_nand_controller_add_nand(nc, nand); + if (ret) + goto err; + } + + return 0; + +err: + atmel_nand_controller_remove_nands(nc); + + return ret; +} + +static void atmel_nand_controller_cleanup(struct atmel_nand_controller *nc) +{ + if (nc->dmac) + dma_release_channel(nc->dmac); + + clk_put(nc->mck); +} + +static const struct of_device_id atmel_matrix_of_ids[] = { + { + .compatible = "atmel,at91sam9260-matrix", + .data = (void *)AT91SAM9260_MATRIX_EBICSA, + }, + { + .compatible = "atmel,at91sam9261-matrix", + .data = (void *)AT91SAM9261_MATRIX_EBICSA, + }, + { + .compatible = "atmel,at91sam9263-matrix", + .data = (void *)AT91SAM9263_MATRIX_EBI0CSA, + }, + { + .compatible = "atmel,at91sam9rl-matrix", + .data = (void *)AT91SAM9RL_MATRIX_EBICSA, + }, + { + .compatible = "atmel,at91sam9g45-matrix", + .data = (void *)AT91SAM9G45_MATRIX_EBICSA, + }, + { + .compatible = "atmel,at91sam9n12-matrix", + .data = (void *)AT91SAM9N12_MATRIX_EBICSA, + }, + { + .compatible = "atmel,at91sam9x5-matrix", + .data = (void *)AT91SAM9X5_MATRIX_EBICSA, + }, + { /* sentinel */ }, +}; + +static int atmel_nand_controller_init(struct atmel_nand_controller *nc, + struct platform_device *pdev, + const struct atmel_nand_controller_caps *caps) +{ + struct device *dev = &pdev->dev; + struct device_node *np = dev->of_node; + int ret; + + nand_hw_control_init(&nc->base); + INIT_LIST_HEAD(&nc->chips); + nc->dev = dev; + nc->caps = caps; + + platform_set_drvdata(pdev, nc); + + nc->pmecc = devm_atmel_pmecc_get(dev); + if (IS_ERR(nc->pmecc)) { + ret = PTR_ERR(nc->pmecc); + if (ret != -EPROBE_DEFER) + dev_err(dev, "Could not get PMECC object (err = %d)\n", + ret); + return ret; + } + + if (nc->caps->has_dma) { + dma_cap_mask_t mask; + + dma_cap_zero(mask); + dma_cap_set(DMA_MEMCPY, mask); + + nc->dmac = dma_request_channel(mask, NULL, NULL); + if (!nc->dmac) + dev_err(nc->dev, "Failed to request DMA channel\n"); + } + + /* We do not retrieve the SMC syscon when parsing old DTs. */ + if (nc->caps->legacy_of_bindings) + return 0; + + nc->mck = of_clk_get(dev->parent->of_node, 0); + if (IS_ERR(nc->mck)) { + dev_err(dev, "Failed to retrieve MCK clk\n"); + return PTR_ERR(nc->mck); + } + + np = of_parse_phandle(dev->parent->of_node, "atmel,smc", 0); + if (!np) { + dev_err(dev, "Missing or invalid atmel,smc property\n"); + return -EINVAL; + } + + nc->smc = syscon_node_to_regmap(np); + of_node_put(np); + if (IS_ERR(nc->smc)) { + ret = PTR_ERR(nc->smc); + dev_err(dev, "Could not get SMC regmap (err = %d)\n", ret); + return ret; + } + + return 0; +} + +static int +atmel_smc_nand_controller_init(struct atmel_smc_nand_controller *nc) +{ + struct device *dev = nc->base.dev; + const struct of_device_id *match; + struct device_node *np; + int ret; + + /* We do not retrieve the matrix syscon when parsing old DTs. */ + if (nc->base.caps->legacy_of_bindings) + return 0; + + np = of_parse_phandle(dev->parent->of_node, "atmel,matrix", 0); + if (!np) + return 0; + + match = of_match_node(atmel_matrix_of_ids, np); + if (!match) { + of_node_put(np); + return 0; + } + + nc->matrix = syscon_node_to_regmap(np); + of_node_put(np); + if (IS_ERR(nc->matrix)) { + ret = PTR_ERR(nc->matrix); + dev_err(dev, "Could not get Matrix regmap (err = %d)\n", ret); + return ret; + } + + nc->ebi_csa_offs = (unsigned int)match->data; + + /* + * The at91sam9263 has 2 EBIs, if the NAND controller is under EBI1 + * add 4 to ->ebi_csa_offs. + */ + if (of_device_is_compatible(dev->parent->of_node, + "atmel,at91sam9263-ebi1")) + nc->ebi_csa_offs += 4; + + return 0; +} + +static int +atmel_hsmc_nand_controller_legacy_init(struct atmel_hsmc_nand_controller *nc) +{ + struct regmap_config regmap_conf = { + .reg_bits = 32, + .val_bits = 32, + .reg_stride = 4, + }; + + struct device *dev = nc->base.dev; + struct device_node *nand_np, *nfc_np; + void __iomem *iomem; + struct resource res; + int ret; + + nand_np = dev->of_node; + nfc_np = of_find_compatible_node(dev->of_node, NULL, + "atmel,sama5d3-nfc"); + + nc->clk = of_clk_get(nfc_np, 0); + if (IS_ERR(nc->clk)) { + ret = PTR_ERR(nc->clk); + dev_err(dev, "Failed to retrieve HSMC clock (err = %d)\n", + ret); + goto out; + } + + ret = clk_prepare_enable(nc->clk); + if (ret) { + dev_err(dev, "Failed to enable the HSMC clock (err = %d)\n", + ret); + goto out; + } + + nc->irq = of_irq_get(nand_np, 0); + if (nc->irq <= 0) { + ret = nc->irq ?: -ENXIO; + if (ret != -EPROBE_DEFER) + dev_err(dev, "Failed to get IRQ number (err = %d)\n", + ret); + goto out; + } + + ret = of_address_to_resource(nfc_np, 0, &res); + if (ret) { + dev_err(dev, "Invalid or missing NFC IO resource (err = %d)\n", + ret); + goto out; + } + + iomem = devm_ioremap_resource(dev, &res); + if (IS_ERR(iomem)) { + ret = PTR_ERR(iomem); + goto out; + } + + regmap_conf.name = "nfc-io"; + regmap_conf.max_register = resource_size(&res) - 4; + nc->io = devm_regmap_init_mmio(dev, iomem, ®map_conf); + if (IS_ERR(nc->io)) { + ret = PTR_ERR(nc->io); + dev_err(dev, "Could not create NFC IO regmap (err = %d)\n", + ret); + goto out; + } + + ret = of_address_to_resource(nfc_np, 1, &res); + if (ret) { + dev_err(dev, "Invalid or missing HSMC resource (err = %d)\n", + ret); + goto out; + } + + iomem = devm_ioremap_resource(dev, &res); + if (IS_ERR(iomem)) { + ret = PTR_ERR(iomem); + goto out; + } + + regmap_conf.name = "smc"; + regmap_conf.max_register = resource_size(&res) - 4; + nc->base.smc = devm_regmap_init_mmio(dev, iomem, ®map_conf); + if (IS_ERR(nc->base.smc)) { + ret = PTR_ERR(nc->base.smc); + dev_err(dev, "Could not create NFC IO regmap (err = %d)\n", + ret); + goto out; + } + + ret = of_address_to_resource(nfc_np, 2, &res); + if (ret) { + dev_err(dev, "Invalid or missing SRAM resource (err = %d)\n", + ret); + goto out; + } + + nc->sram.virt = devm_ioremap_resource(dev, &res); + if (IS_ERR(nc->sram.virt)) { + ret = PTR_ERR(nc->sram.virt); + goto out; + } + + nc->sram.dma = res.start; + +out: + of_node_put(nfc_np); + + return ret; +} + +static int +atmel_hsmc_nand_controller_init(struct atmel_hsmc_nand_controller *nc) +{ + struct device *dev = nc->base.dev; + struct device_node *np; + int ret; + + np = of_parse_phandle(dev->parent->of_node, "atmel,smc", 0); + if (!np) { + dev_err(dev, "Missing or invalid atmel,smc property\n"); + return -EINVAL; + } + + nc->hsmc_layout = atmel_hsmc_get_reg_layout(np); + + nc->irq = of_irq_get(np, 0); + of_node_put(np); + if (nc->irq <= 0) { + ret = nc->irq ?: -ENXIO; + if (ret != -EPROBE_DEFER) + dev_err(dev, "Failed to get IRQ number (err = %d)\n", + ret); + return ret; + } + + np = of_parse_phandle(dev->of_node, "atmel,nfc-io", 0); + if (!np) { + dev_err(dev, "Missing or invalid atmel,nfc-io property\n"); + return -EINVAL; + } + + nc->io = syscon_node_to_regmap(np); + of_node_put(np); + if (IS_ERR(nc->io)) { + ret = PTR_ERR(nc->io); + dev_err(dev, "Could not get NFC IO regmap (err = %d)\n", ret); + return ret; + } + + nc->sram.pool = of_gen_pool_get(nc->base.dev->of_node, + "atmel,nfc-sram", 0); + if (!nc->sram.pool) { + dev_err(nc->base.dev, "Missing SRAM\n"); + return -ENOMEM; + } + + nc->sram.virt = gen_pool_dma_alloc(nc->sram.pool, + ATMEL_NFC_SRAM_SIZE, + &nc->sram.dma); + if (!nc->sram.virt) { + dev_err(nc->base.dev, + "Could not allocate memory from the NFC SRAM pool\n"); + return -ENOMEM; + } + + return 0; +} + +static int +atmel_hsmc_nand_controller_remove(struct atmel_nand_controller *nc) +{ + struct atmel_hsmc_nand_controller *hsmc_nc; + int ret; + + ret = atmel_nand_controller_remove_nands(nc); + if (ret) + return ret; + + hsmc_nc = container_of(nc, struct atmel_hsmc_nand_controller, base); + if (hsmc_nc->sram.pool) + gen_pool_free(hsmc_nc->sram.pool, + (unsigned long)hsmc_nc->sram.virt, + ATMEL_NFC_SRAM_SIZE); + + if (hsmc_nc->clk) { + clk_disable_unprepare(hsmc_nc->clk); + clk_put(hsmc_nc->clk); + } + + atmel_nand_controller_cleanup(nc); + + return 0; +} + +static int atmel_hsmc_nand_controller_probe(struct platform_device *pdev, + const struct atmel_nand_controller_caps *caps) +{ + struct device *dev = &pdev->dev; + struct atmel_hsmc_nand_controller *nc; + int ret; + + nc = devm_kzalloc(dev, sizeof(*nc), GFP_KERNEL); + if (!nc) + return -ENOMEM; + + ret = atmel_nand_controller_init(&nc->base, pdev, caps); + if (ret) + return ret; + + if (caps->legacy_of_bindings) + ret = atmel_hsmc_nand_controller_legacy_init(nc); + else + ret = atmel_hsmc_nand_controller_init(nc); + + if (ret) + return ret; + + /* Make sure all irqs are masked before registering our IRQ handler. */ + regmap_write(nc->base.smc, ATMEL_HSMC_NFC_IDR, 0xffffffff); + ret = devm_request_irq(dev, nc->irq, atmel_nfc_interrupt, + IRQF_SHARED, "nfc", nc); + if (ret) { + dev_err(dev, + "Could not get register NFC interrupt handler (err = %d)\n", + ret); + goto err; + } + + /* Initial NFC configuration. */ + regmap_write(nc->base.smc, ATMEL_HSMC_NFC_CFG, + ATMEL_HSMC_NFC_CFG_DTO_MAX); + + ret = atmel_nand_controller_add_nands(&nc->base); + if (ret) + goto err; + + return 0; + +err: + atmel_hsmc_nand_controller_remove(&nc->base); + + return ret; +} + +static const struct atmel_nand_controller_ops atmel_hsmc_nc_ops = { + .probe = atmel_hsmc_nand_controller_probe, + .remove = atmel_hsmc_nand_controller_remove, + .ecc_init = atmel_hsmc_nand_ecc_init, + .nand_init = atmel_hsmc_nand_init, + .setup_data_interface = atmel_hsmc_nand_setup_data_interface, +}; + +static const struct atmel_nand_controller_caps atmel_sama5_nc_caps = { + .has_dma = true, + .ale_offs = BIT(21), + .cle_offs = BIT(22), + .ops = &atmel_hsmc_nc_ops, +}; + +/* Only used to parse old bindings. */ +static const struct atmel_nand_controller_caps atmel_sama5_nand_caps = { + .has_dma = true, + .ale_offs = BIT(21), + .cle_offs = BIT(22), + .ops = &atmel_hsmc_nc_ops, + .legacy_of_bindings = true, +}; + +static int atmel_smc_nand_controller_probe(struct platform_device *pdev, + const struct atmel_nand_controller_caps *caps) +{ + struct device *dev = &pdev->dev; + struct atmel_smc_nand_controller *nc; + int ret; + + nc = devm_kzalloc(dev, sizeof(*nc), GFP_KERNEL); + if (!nc) + return -ENOMEM; + + ret = atmel_nand_controller_init(&nc->base, pdev, caps); + if (ret) + return ret; + + ret = atmel_smc_nand_controller_init(nc); + if (ret) + return ret; + + return atmel_nand_controller_add_nands(&nc->base); +} + +static int +atmel_smc_nand_controller_remove(struct atmel_nand_controller *nc) +{ + int ret; + + ret = atmel_nand_controller_remove_nands(nc); + if (ret) + return ret; + + atmel_nand_controller_cleanup(nc); + + return 0; +} + +/* + * The SMC reg layout of at91rm9200 is completely different which prevents us + * from re-using atmel_smc_nand_setup_data_interface() for the + * ->setup_data_interface() hook. + * At this point, there's no support for the at91rm9200 SMC IP, so we leave + * ->setup_data_interface() unassigned. + */ +static const struct atmel_nand_controller_ops at91rm9200_nc_ops = { + .probe = atmel_smc_nand_controller_probe, + .remove = atmel_smc_nand_controller_remove, + .ecc_init = atmel_nand_ecc_init, + .nand_init = atmel_smc_nand_init, +}; + +static const struct atmel_nand_controller_caps atmel_rm9200_nc_caps = { + .ale_offs = BIT(21), + .cle_offs = BIT(22), + .ops = &at91rm9200_nc_ops, +}; + +static const struct atmel_nand_controller_ops atmel_smc_nc_ops = { + .probe = atmel_smc_nand_controller_probe, + .remove = atmel_smc_nand_controller_remove, + .ecc_init = atmel_nand_ecc_init, + .nand_init = atmel_smc_nand_init, + .setup_data_interface = atmel_smc_nand_setup_data_interface, +}; + +static const struct atmel_nand_controller_caps atmel_sam9260_nc_caps = { + .ale_offs = BIT(21), + .cle_offs = BIT(22), + .ops = &atmel_smc_nc_ops, +}; + +static const struct atmel_nand_controller_caps atmel_sam9261_nc_caps = { + .ale_offs = BIT(22), + .cle_offs = BIT(21), + .ops = &atmel_smc_nc_ops, +}; + +static const struct atmel_nand_controller_caps atmel_sam9g45_nc_caps = { + .has_dma = true, + .ale_offs = BIT(21), + .cle_offs = BIT(22), + .ops = &atmel_smc_nc_ops, +}; + +/* Only used to parse old bindings. */ +static const struct atmel_nand_controller_caps atmel_rm9200_nand_caps = { + .ale_offs = BIT(21), + .cle_offs = BIT(22), + .ops = &atmel_smc_nc_ops, + .legacy_of_bindings = true, +}; + +static const struct atmel_nand_controller_caps atmel_sam9261_nand_caps = { + .ale_offs = BIT(22), + .cle_offs = BIT(21), + .ops = &atmel_smc_nc_ops, + .legacy_of_bindings = true, +}; + +static const struct atmel_nand_controller_caps atmel_sam9g45_nand_caps = { + .has_dma = true, + .ale_offs = BIT(21), + .cle_offs = BIT(22), + .ops = &atmel_smc_nc_ops, + .legacy_of_bindings = true, +}; + +static const struct of_device_id atmel_nand_controller_of_ids[] = { + { + .compatible = "atmel,at91rm9200-nand-controller", + .data = &atmel_rm9200_nc_caps, + }, + { + .compatible = "atmel,at91sam9260-nand-controller", + .data = &atmel_sam9260_nc_caps, + }, + { + .compatible = "atmel,at91sam9261-nand-controller", + .data = &atmel_sam9261_nc_caps, + }, + { + .compatible = "atmel,at91sam9g45-nand-controller", + .data = &atmel_sam9g45_nc_caps, + }, + { + .compatible = "atmel,sama5d3-nand-controller", + .data = &atmel_sama5_nc_caps, + }, + /* Support for old/deprecated bindings: */ + { + .compatible = "atmel,at91rm9200-nand", + .data = &atmel_rm9200_nand_caps, + }, + { + .compatible = "atmel,sama5d4-nand", + .data = &atmel_rm9200_nand_caps, + }, + { + .compatible = "atmel,sama5d2-nand", + .data = &atmel_rm9200_nand_caps, + }, + { /* sentinel */ }, +}; +MODULE_DEVICE_TABLE(of, atmel_nand_controller_of_ids); + +static int atmel_nand_controller_probe(struct platform_device *pdev) +{ + const struct atmel_nand_controller_caps *caps; + + if (pdev->id_entry) + caps = (void *)pdev->id_entry->driver_data; + else + caps = of_device_get_match_data(&pdev->dev); + + if (!caps) { + dev_err(&pdev->dev, "Could not retrieve NFC caps\n"); + return -EINVAL; + } + + if (caps->legacy_of_bindings) { + u32 ale_offs = 21; + + /* + * If we are parsing legacy DT props and the DT contains a + * valid NFC node, forward the request to the sama5 logic. + */ + if (of_find_compatible_node(pdev->dev.of_node, NULL, + "atmel,sama5d3-nfc")) + caps = &atmel_sama5_nand_caps; + + /* + * Even if the compatible says we are dealing with an + * at91rm9200 controller, the atmel,nand-has-dma specify that + * this controller supports DMA, which means we are in fact + * dealing with an at91sam9g45+ controller. + */ + if (!caps->has_dma && + of_property_read_bool(pdev->dev.of_node, + "atmel,nand-has-dma")) + caps = &atmel_sam9g45_nand_caps; + + /* + * All SoCs except the at91sam9261 are assigning ALE to A21 and + * CLE to A22. If atmel,nand-addr-offset != 21 this means we're + * actually dealing with an at91sam9261 controller. + */ + of_property_read_u32(pdev->dev.of_node, + "atmel,nand-addr-offset", &ale_offs); + if (ale_offs != 21) + caps = &atmel_sam9261_nand_caps; + } + + return caps->ops->probe(pdev, caps); +} + +static int atmel_nand_controller_remove(struct platform_device *pdev) +{ + struct atmel_nand_controller *nc = platform_get_drvdata(pdev); + + return nc->caps->ops->remove(nc); +} + +static __maybe_unused int atmel_nand_controller_resume(struct device *dev) +{ + struct atmel_nand_controller *nc = dev_get_drvdata(dev); + struct atmel_nand *nand; + + if (nc->pmecc) + atmel_pmecc_reset(nc->pmecc); + + list_for_each_entry(nand, &nc->chips, node) { + int i; + + for (i = 0; i < nand->numcs; i++) + nand_reset(&nand->base, i); + } + + return 0; +} + +static SIMPLE_DEV_PM_OPS(atmel_nand_controller_pm_ops, NULL, + atmel_nand_controller_resume); + +static struct platform_driver atmel_nand_controller_driver = { + .driver = { + .name = "atmel-nand-controller", + .of_match_table = of_match_ptr(atmel_nand_controller_of_ids), + .pm = &atmel_nand_controller_pm_ops, + }, + .probe = atmel_nand_controller_probe, + .remove = atmel_nand_controller_remove, +}; +module_platform_driver(atmel_nand_controller_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Boris Brezillon <boris.brezillon@free-electrons.com>"); +MODULE_DESCRIPTION("NAND Flash Controller driver for Atmel SoCs"); +MODULE_ALIAS("platform:atmel-nand-controller"); |