This adds support for NAND controller on STM32MP SoCs. The original source is taken from linux-6.4.
Signed-off-by: Alexander Shiyan <[email protected]> --- drivers/mtd/nand/Kconfig | 12 + drivers/mtd/nand/Makefile | 1 + drivers/mtd/nand/stm32_fmc2_nand.c | 1354 ++++++++++++++++++++++++++++ 3 files changed, 1367 insertions(+) create mode 100644 drivers/mtd/nand/stm32_fmc2_nand.c diff --git a/drivers/mtd/nand/Kconfig b/drivers/mtd/nand/Kconfig index d4b941d20c..87926d88d2 100644 --- a/drivers/mtd/nand/Kconfig +++ b/drivers/mtd/nand/Kconfig @@ -95,6 +95,18 @@ config NAND_MRVL_NFC Support for the PXA3xx NAND controller, present in Armada 370/XP and PXA3xx SoCs. +config NAND_STM32 + bool "Support for NAND controller on STM32MP SoCs" + depends on ARCH_STM32MP || COMPILE_TEST + select STM32_FMC2_EBI if ARCH_STM32MP + select RESET_CONTROLLER if ARCH_STM32MP + select RESET_SIMPLE if ARCH_STM32MP + help + Enables support for NAND Flash chips on SoCs containing the FMC2 + NAND controller. This controller is found on STM32MP SoCs. + The controller supports a maximum 8k page size and supports + a maximum 8-bit correction error per sector of 512 bytes. + config NAND_ATMEL bool prompt "Atmel (AT91SAM9xxx) NAND driver" diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile index 6258eb2177..a0207d328b 100644 --- a/drivers/mtd/nand/Makefile +++ b/drivers/mtd/nand/Makefile @@ -16,6 +16,7 @@ obj-$(CONFIG_NAND_IMX) += nand_imx.o obj-$(CONFIG_NAND_OMAP_GPMC) += nand_omap_gpmc.o nand_omap_bch_decoder.o obj-$(CONFIG_MTD_NAND_OMAP_ELM) += omap_elm.o obj-$(CONFIG_NAND_ORION) += nand_orion.o +obj-$(CONFIG_NAND_STM32) += stm32_fmc2_nand.o obj-$(CONFIG_NAND_MRVL_NFC) += nand_mrvl_nfc.o obj-$(CONFIG_NAND_ATMEL) += atmel/ obj-$(CONFIG_NAND_MXS) += nand_mxs.o diff --git a/drivers/mtd/nand/stm32_fmc2_nand.c b/drivers/mtd/nand/stm32_fmc2_nand.c new file mode 100644 index 0000000000..958a619be5 --- /dev/null +++ b/drivers/mtd/nand/stm32_fmc2_nand.c @@ -0,0 +1,1354 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) STMicroelectronics 2018 + * Author: Christophe Kerello <[email protected]> + */ + +#include <common.h> +#include <init.h> +#include <of_address.h> +#include <regmap.h> +#include <linux/bitfield.h> +#include <linux/clk.h> +#include <linux/gpio/consumer.h> +#include <linux/iopoll.h> +#include <linux/reset.h> +#include <mfd/syscon.h> + +#include "internals.h" + +/* Bad block marker length */ +#define FMC2_BBM_LEN 2 + +/* ECC step size */ +#define FMC2_ECC_STEP_SIZE 512 + +/* Max requests done for a 8k nand page size */ +#define FMC2_MAX_SG 16 + +/* Max chip enable */ +#define FMC2_MAX_CE 2 + +#define FMC2_TIMEOUT_MS 5000 + +/* Timings */ +#define FMC2_THIZ 1 +#define FMC2_TIO 8000 +#define FMC2_TSYNC 3000 +#define FMC2_PCR_TIMING_MASK 0xf +#define FMC2_PMEM_PATT_TIMING_MASK 0xff + +/* FMC2 Controller Registers */ +#define FMC2_BCR1 0x0 +#define FMC2_PCR 0x80 +#define FMC2_SR 0x84 +#define FMC2_PMEM 0x88 +#define FMC2_PATT 0x8c +#define FMC2_HECCR 0x94 +#define FMC2_ISR 0x184 +#define FMC2_ICR 0x188 +#define FMC2_CSQCR 0x200 +#define FMC2_CSQCFGR1 0x204 +#define FMC2_CSQCFGR2 0x208 +#define FMC2_CSQCFGR3 0x20c +#define FMC2_CSQAR1 0x210 +#define FMC2_CSQAR2 0x214 +#define FMC2_CSQIER 0x220 +#define FMC2_CSQISR 0x224 +#define FMC2_CSQICR 0x228 +#define FMC2_CSQEMSR 0x230 +#define FMC2_BCHIER 0x250 +#define FMC2_BCHISR 0x254 +#define FMC2_BCHICR 0x258 +#define FMC2_BCHPBR1 0x260 +#define FMC2_BCHPBR2 0x264 +#define FMC2_BCHPBR3 0x268 +#define FMC2_BCHPBR4 0x26c +#define FMC2_BCHDSR0 0x27c +#define FMC2_BCHDSR1 0x280 +#define FMC2_BCHDSR2 0x284 +#define FMC2_BCHDSR3 0x288 +#define FMC2_BCHDSR4 0x28c + +/* Register: FMC2_BCR1 */ +#define FMC2_BCR1_FMC2EN BIT(31) + +/* Register: FMC2_PCR */ +#define FMC2_PCR_PWAITEN BIT(1) +#define FMC2_PCR_PBKEN BIT(2) +#define FMC2_PCR_PWID GENMASK(5, 4) +#define FMC2_PCR_PWID_BUSWIDTH_8 0 +#define FMC2_PCR_PWID_BUSWIDTH_16 1 +#define FMC2_PCR_ECCEN BIT(6) +#define FMC2_PCR_ECCALG BIT(8) +#define FMC2_PCR_TCLR GENMASK(12, 9) +#define FMC2_PCR_TCLR_DEFAULT 0xf +#define FMC2_PCR_TAR GENMASK(16, 13) +#define FMC2_PCR_TAR_DEFAULT 0xf +#define FMC2_PCR_ECCSS GENMASK(19, 17) +#define FMC2_PCR_ECCSS_512 1 +#define FMC2_PCR_ECCSS_2048 3 +#define FMC2_PCR_BCHECC BIT(24) +#define FMC2_PCR_WEN BIT(25) + +/* Register: FMC2_SR */ +#define FMC2_SR_NWRF BIT(6) + +/* Register: FMC2_PMEM */ +#define FMC2_PMEM_MEMSET GENMASK(7, 0) +#define FMC2_PMEM_MEMWAIT GENMASK(15, 8) +#define FMC2_PMEM_MEMHOLD GENMASK(23, 16) +#define FMC2_PMEM_MEMHIZ GENMASK(31, 24) +#define FMC2_PMEM_DEFAULT 0x0a0a0a0a + +/* Register: FMC2_PATT */ +#define FMC2_PATT_ATTSET GENMASK(7, 0) +#define FMC2_PATT_ATTWAIT GENMASK(15, 8) +#define FMC2_PATT_ATTHOLD GENMASK(23, 16) +#define FMC2_PATT_ATTHIZ GENMASK(31, 24) +#define FMC2_PATT_DEFAULT 0x0a0a0a0a + +/* Register: FMC2_ISR */ +#define FMC2_ISR_IHLF BIT(1) + +/* Register: FMC2_BCHISR */ +#define FMC2_BCHISR_DERF BIT(1) +#define FMC2_BCHISR_EPBRF BIT(4) + +/* Register: FMC2_ICR */ +#define FMC2_ICR_CIHLF BIT(1) + +/* Register: FMC2_CSQCR */ +#define FMC2_CSQCR_CSQSTART BIT(0) + +/* Register: FMC2_CSQCFGR1 */ +#define FMC2_CSQCFGR1_CMD2EN BIT(1) +#define FMC2_CSQCFGR1_DMADEN BIT(2) +#define FMC2_CSQCFGR1_ACYNBR GENMASK(6, 4) +#define FMC2_CSQCFGR1_CMD1 GENMASK(15, 8) +#define FMC2_CSQCFGR1_CMD2 GENMASK(23, 16) +#define FMC2_CSQCFGR1_CMD1T BIT(24) +#define FMC2_CSQCFGR1_CMD2T BIT(25) + +/* Register: FMC2_CSQCFGR2 */ +#define FMC2_CSQCFGR2_SQSDTEN BIT(0) +#define FMC2_CSQCFGR2_RCMD2EN BIT(1) +#define FMC2_CSQCFGR2_DMASEN BIT(2) +#define FMC2_CSQCFGR2_RCMD1 GENMASK(15, 8) +#define FMC2_CSQCFGR2_RCMD2 GENMASK(23, 16) +#define FMC2_CSQCFGR2_RCMD1T BIT(24) +#define FMC2_CSQCFGR2_RCMD2T BIT(25) + +/* Register: FMC2_CSQCFGR3 */ +#define FMC2_CSQCFGR3_SNBR GENMASK(13, 8) +#define FMC2_CSQCFGR3_AC1T BIT(16) +#define FMC2_CSQCFGR3_AC2T BIT(17) +#define FMC2_CSQCFGR3_AC3T BIT(18) +#define FMC2_CSQCFGR3_AC4T BIT(19) +#define FMC2_CSQCFGR3_AC5T BIT(20) +#define FMC2_CSQCFGR3_SDT BIT(21) +#define FMC2_CSQCFGR3_RAC1T BIT(22) +#define FMC2_CSQCFGR3_RAC2T BIT(23) + +/* Register: FMC2_CSQCAR1 */ +#define FMC2_CSQCAR1_ADDC1 GENMASK(7, 0) +#define FMC2_CSQCAR1_ADDC2 GENMASK(15, 8) +#define FMC2_CSQCAR1_ADDC3 GENMASK(23, 16) +#define FMC2_CSQCAR1_ADDC4 GENMASK(31, 24) + +/* Register: FMC2_CSQCAR2 */ +#define FMC2_CSQCAR2_ADDC5 GENMASK(7, 0) +#define FMC2_CSQCAR2_NANDCEN GENMASK(11, 10) +#define FMC2_CSQCAR2_SAO GENMASK(31, 16) + +/* Register: FMC2_CSQIER */ +#define FMC2_CSQIER_TCIE BIT(0) + +/* Register: FMC2_CSQICR */ +#define FMC2_CSQICR_CLEAR_IRQ GENMASK(4, 0) + +/* Register: FMC2_CSQEMSR */ +#define FMC2_CSQEMSR_SEM GENMASK(15, 0) + +/* Register: FMC2_BCHIER */ +#define FMC2_BCHIER_DERIE BIT(1) +#define FMC2_BCHIER_EPBRIE BIT(4) + +/* Register: FMC2_BCHICR */ +#define FMC2_BCHICR_CLEAR_IRQ GENMASK(4, 0) + +/* Register: FMC2_BCHDSR0 */ +#define FMC2_BCHDSR0_DUE BIT(0) +#define FMC2_BCHDSR0_DEF BIT(1) +#define FMC2_BCHDSR0_DEN GENMASK(7, 4) + +/* Register: FMC2_BCHDSR1 */ +#define FMC2_BCHDSR1_EBP1 GENMASK(12, 0) +#define FMC2_BCHDSR1_EBP2 GENMASK(28, 16) + +/* Register: FMC2_BCHDSR2 */ +#define FMC2_BCHDSR2_EBP3 GENMASK(12, 0) +#define FMC2_BCHDSR2_EBP4 GENMASK(28, 16) + +/* Register: FMC2_BCHDSR3 */ +#define FMC2_BCHDSR3_EBP5 GENMASK(12, 0) +#define FMC2_BCHDSR3_EBP6 GENMASK(28, 16) + +/* Register: FMC2_BCHDSR4 */ +#define FMC2_BCHDSR4_EBP7 GENMASK(12, 0) +#define FMC2_BCHDSR4_EBP8 GENMASK(28, 16) + +enum stm32_fmc2_ecc { + FMC2_ECC_HAM = 1, + FMC2_ECC_BCH4 = 4, + FMC2_ECC_BCH8 = 8 +}; + +struct stm32_fmc2_timings { + u8 tclr; + u8 tar; + u8 thiz; + u8 twait; + u8 thold_mem; + u8 tset_mem; + u8 thold_att; + u8 tset_att; +}; + +struct stm32_fmc2_nand { + struct nand_chip chip; + struct gpio_desc *wp_gpio; + struct stm32_fmc2_timings timings; + int ncs; + int cs_used[FMC2_MAX_CE]; +}; + +static inline struct stm32_fmc2_nand *to_fmc2_nand(struct nand_chip *chip) +{ + return container_of(chip, struct stm32_fmc2_nand, chip); +} + +struct stm32_fmc2_nfc { + struct nand_controller base; + struct stm32_fmc2_nand nand; + struct device *dev; + struct device *cdev; + struct regmap *regmap; + void __iomem *data_base[FMC2_MAX_CE]; + void __iomem *cmd_base[FMC2_MAX_CE]; + void __iomem *addr_base[FMC2_MAX_CE]; + struct clk *clk; + + u8 cs_assigned; + int cs_sel; +}; + +static inline struct stm32_fmc2_nfc *to_stm32_nfc(struct nand_controller *base) +{ + return container_of(base, struct stm32_fmc2_nfc, base); +} + +static void stm32_fmc2_nfc_timings_init(struct nand_chip *chip) +{ + struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller); + struct stm32_fmc2_nand *nand = to_fmc2_nand(chip); + struct stm32_fmc2_timings *timings = &nand->timings; + u32 pmem, patt; + + /* Set tclr/tar timings */ + regmap_update_bits(nfc->regmap, FMC2_PCR, + FMC2_PCR_TCLR | FMC2_PCR_TAR, + FIELD_PREP(FMC2_PCR_TCLR, timings->tclr) | + FIELD_PREP(FMC2_PCR_TAR, timings->tar)); + + /* Set tset/twait/thold/thiz timings in common bank */ + pmem = FIELD_PREP(FMC2_PMEM_MEMSET, timings->tset_mem); + pmem |= FIELD_PREP(FMC2_PMEM_MEMWAIT, timings->twait); + pmem |= FIELD_PREP(FMC2_PMEM_MEMHOLD, timings->thold_mem); + pmem |= FIELD_PREP(FMC2_PMEM_MEMHIZ, timings->thiz); + regmap_write(nfc->regmap, FMC2_PMEM, pmem); + + /* Set tset/twait/thold/thiz timings in attribut bank */ + patt = FIELD_PREP(FMC2_PATT_ATTSET, timings->tset_att); + patt |= FIELD_PREP(FMC2_PATT_ATTWAIT, timings->twait); + patt |= FIELD_PREP(FMC2_PATT_ATTHOLD, timings->thold_att); + patt |= FIELD_PREP(FMC2_PATT_ATTHIZ, timings->thiz); + regmap_write(nfc->regmap, FMC2_PATT, patt); +} + +static void stm32_fmc2_nfc_setup(struct nand_chip *chip) +{ + struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller); + u32 pcr = 0, pcr_mask; + + /* Configure ECC algorithm (default configuration is Hamming) */ + pcr_mask = FMC2_PCR_ECCALG; + pcr_mask |= FMC2_PCR_BCHECC; + if (chip->ecc.strength == FMC2_ECC_BCH8) { + pcr |= FMC2_PCR_ECCALG; + pcr |= FMC2_PCR_BCHECC; + } else if (chip->ecc.strength == FMC2_ECC_BCH4) { + pcr |= FMC2_PCR_ECCALG; + } + + /* Set buswidth */ + pcr_mask |= FMC2_PCR_PWID; + if (chip->options & NAND_BUSWIDTH_16) + pcr |= FIELD_PREP(FMC2_PCR_PWID, FMC2_PCR_PWID_BUSWIDTH_16); + + /* Set ECC sector size */ + pcr_mask |= FMC2_PCR_ECCSS; + pcr |= FIELD_PREP(FMC2_PCR_ECCSS, FMC2_PCR_ECCSS_512); + + regmap_update_bits(nfc->regmap, FMC2_PCR, pcr_mask, pcr); +} + +static void stm32_fmc2_nfc_select_chip(struct nand_chip *chip, int chipnr) +{ + struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller); + struct stm32_fmc2_nand *nand = to_fmc2_nand(chip); + + if (nand->cs_used[chipnr] == nfc->cs_sel) + return; + + nfc->cs_sel = nand->cs_used[chipnr]; + stm32_fmc2_nfc_setup(chip); + stm32_fmc2_nfc_timings_init(chip); +} + +static void stm32_fmc2_nfc_set_buswidth_16(struct stm32_fmc2_nfc *nfc, bool set) +{ + u32 pcr; + + pcr = set ? FIELD_PREP(FMC2_PCR_PWID, FMC2_PCR_PWID_BUSWIDTH_16) : + FIELD_PREP(FMC2_PCR_PWID, FMC2_PCR_PWID_BUSWIDTH_8); + + regmap_update_bits(nfc->regmap, FMC2_PCR, FMC2_PCR_PWID, pcr); +} + +static void stm32_fmc2_nfc_set_ecc(struct stm32_fmc2_nfc *nfc, bool enable) +{ + regmap_update_bits(nfc->regmap, FMC2_PCR, FMC2_PCR_ECCEN, + enable ? FMC2_PCR_ECCEN : 0); +} + +static void stm32_fmc2_nfc_clear_bch_irq(struct stm32_fmc2_nfc *nfc) +{ + regmap_write(nfc->regmap, FMC2_BCHICR, FMC2_BCHICR_CLEAR_IRQ); +} + +/* + * Enable ECC logic and reset syndrome/parity bits previously calculated + * Syndrome/parity bits is cleared by setting the ECCEN bit to 0 + */ +static void stm32_fmc2_nfc_hwctl(struct nand_chip *chip, int mode) +{ + struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller); + + stm32_fmc2_nfc_set_ecc(nfc, false); + + if (chip->ecc.strength != FMC2_ECC_HAM) { + regmap_update_bits(nfc->regmap, FMC2_PCR, FMC2_PCR_WEN, + mode == NAND_ECC_WRITE ? FMC2_PCR_WEN : 0); + + stm32_fmc2_nfc_clear_bch_irq(nfc); + } + + stm32_fmc2_nfc_set_ecc(nfc, true); +} + +/* + * ECC Hamming calculation + * ECC is 3 bytes for 512 bytes of data (supports error correction up to + * max of 1-bit) + */ +static void stm32_fmc2_nfc_ham_set_ecc(const u32 ecc_sta, u8 *ecc) +{ + ecc[0] = ecc_sta; + ecc[1] = ecc_sta >> 8; + ecc[2] = ecc_sta >> 16; +} + +static int stm32_fmc2_nfc_ham_calculate(struct nand_chip *chip, const u8 *data, + u8 *ecc) +{ + struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller); + u32 sr, heccr; + int ret; + + ret = regmap_read_poll_timeout(nfc->regmap, FMC2_SR, sr, + sr & FMC2_SR_NWRF, + 1000 * FMC2_TIMEOUT_MS); + if (ret) { + dev_err(nfc->dev, "ham timeout\n"); + return ret; + } + + regmap_read(nfc->regmap, FMC2_HECCR, &heccr); + stm32_fmc2_nfc_ham_set_ecc(heccr, ecc); + stm32_fmc2_nfc_set_ecc(nfc, false); + + return 0; +} + +static int stm32_fmc2_nfc_ham_correct(struct nand_chip *chip, u8 *dat, + u8 *read_ecc, u8 *calc_ecc) +{ + u8 bit_position = 0, b0, b1, b2; + u32 byte_addr = 0, b; + u32 i, shifting = 1; + + /* Indicate which bit and byte is faulty (if any) */ + b0 = read_ecc[0] ^ calc_ecc[0]; + b1 = read_ecc[1] ^ calc_ecc[1]; + b2 = read_ecc[2] ^ calc_ecc[2]; + b = b0 | (b1 << 8) | (b2 << 16); + + /* No errors */ + if (likely(!b)) + return 0; + + /* Calculate bit position */ + for (i = 0; i < 3; i++) { + switch (b % 4) { + case 2: + bit_position += shifting; + break; + case 1: + break; + default: + return -EBADMSG; + } + shifting <<= 1; + b >>= 2; + } + + /* Calculate byte position */ + shifting = 1; + for (i = 0; i < 9; i++) { + switch (b % 4) { + case 2: + byte_addr += shifting; + break; + case 1: + break; + default: + return -EBADMSG; + } + shifting <<= 1; + b >>= 2; + } + + /* Flip the bit */ + dat[byte_addr] ^= (1 << bit_position); + + return 1; +} + +/* + * ECC BCH calculation and correction + * ECC is 7/13 bytes for 512 bytes of data (supports error correction up to + * max of 4-bit/8-bit) + */ +static int stm32_fmc2_nfc_bch_calculate(struct nand_chip *chip, const u8 *data, + u8 *ecc) +{ + struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller); + u32 bchisr, bchpbr; + int ret; + + /* Wait until the BCH code is ready */ + ret = regmap_read_poll_timeout(nfc->regmap, FMC2_BCHISR, bchisr, + bchisr & FMC2_BCHISR_EPBRF, + 1000 * FMC2_TIMEOUT_MS); + if (ret) { + dev_err(nfc->dev, "bch timeout\n"); + return -ETIMEDOUT; + } + + /* Read parity bits */ + regmap_read(nfc->regmap, FMC2_BCHPBR1, &bchpbr); + ecc[0] = bchpbr; + ecc[1] = bchpbr >> 8; + ecc[2] = bchpbr >> 16; + ecc[3] = bchpbr >> 24; + + regmap_read(nfc->regmap, FMC2_BCHPBR2, &bchpbr); + ecc[4] = bchpbr; + ecc[5] = bchpbr >> 8; + ecc[6] = bchpbr >> 16; + + if (chip->ecc.strength == FMC2_ECC_BCH8) { + ecc[7] = bchpbr >> 24; + + regmap_read(nfc->regmap, FMC2_BCHPBR3, &bchpbr); + ecc[8] = bchpbr; + ecc[9] = bchpbr >> 8; + ecc[10] = bchpbr >> 16; + ecc[11] = bchpbr >> 24; + + regmap_read(nfc->regmap, FMC2_BCHPBR4, &bchpbr); + ecc[12] = bchpbr; + } + + stm32_fmc2_nfc_set_ecc(nfc, false); + + return 0; +} + +static int stm32_fmc2_nfc_bch_decode(int eccsize, u8 *dat, u32 *ecc_sta) +{ + u32 bchdsr0 = ecc_sta[0]; + u32 bchdsr1 = ecc_sta[1]; + u32 bchdsr2 = ecc_sta[2]; + u32 bchdsr3 = ecc_sta[3]; + u32 bchdsr4 = ecc_sta[4]; + u16 pos[8]; + int i, den; + unsigned int nb_errs = 0; + + /* No errors found */ + if (likely(!(bchdsr0 & FMC2_BCHDSR0_DEF))) + return 0; + + /* Too many errors detected */ + if (unlikely(bchdsr0 & FMC2_BCHDSR0_DUE)) + return -EBADMSG; + + pos[0] = FIELD_GET(FMC2_BCHDSR1_EBP1, bchdsr1); + pos[1] = FIELD_GET(FMC2_BCHDSR1_EBP2, bchdsr1); + pos[2] = FIELD_GET(FMC2_BCHDSR2_EBP3, bchdsr2); + pos[3] = FIELD_GET(FMC2_BCHDSR2_EBP4, bchdsr2); + pos[4] = FIELD_GET(FMC2_BCHDSR3_EBP5, bchdsr3); + pos[5] = FIELD_GET(FMC2_BCHDSR3_EBP6, bchdsr3); + pos[6] = FIELD_GET(FMC2_BCHDSR4_EBP7, bchdsr4); + pos[7] = FIELD_GET(FMC2_BCHDSR4_EBP8, bchdsr4); + + den = FIELD_GET(FMC2_BCHDSR0_DEN, bchdsr0); + for (i = 0; i < den; i++) { + if (pos[i] < eccsize * 8) { + change_bit(pos[i], (unsigned long *)dat); + nb_errs++; + } + } + + return nb_errs; +} + +static int stm32_fmc2_nfc_bch_correct(struct nand_chip *chip, u8 *dat, + u8 *read_ecc, u8 *calc_ecc) +{ + struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller); + u32 bchisr, ecc_sta[5]; + int ret; + + /* Wait until the decoding error is ready */ + ret = regmap_read_poll_timeout(nfc->regmap, FMC2_BCHISR, bchisr, + bchisr & FMC2_BCHISR_DERF, + 1000 * FMC2_TIMEOUT_MS); + if (ret) { + dev_err(nfc->dev, "bch timeout\n"); + return -ETIMEDOUT; + } + + regmap_bulk_read(nfc->regmap, FMC2_BCHDSR0, ecc_sta, 5); + + stm32_fmc2_nfc_set_ecc(nfc, false); + + return stm32_fmc2_nfc_bch_decode(chip->ecc.size, dat, ecc_sta); +} + +static int stm32_fmc2_nfc_read_page(struct nand_chip *chip, u8 *buf, + int oob_required, int page) +{ + struct mtd_info *mtd = nand_to_mtd(chip); + int ret, i, s, stat, eccsize = chip->ecc.size; + int eccbytes = chip->ecc.bytes; + int eccsteps = chip->ecc.steps; + int eccstrength = chip->ecc.strength; + u8 *p = buf; + u8 *ecc_calc = chip->ecc.calc_buf; + u8 *ecc_code = chip->ecc.code_buf; + unsigned int max_bitflips = 0; + + ret = nand_read_page_op(chip, page, 0, NULL, 0); + if (ret) + return ret; + + for (i = mtd->writesize + FMC2_BBM_LEN, s = 0; s < eccsteps; + s++, i += eccbytes, p += eccsize) { + chip->ecc.hwctl(chip, NAND_ECC_READ); + + /* Read the nand page sector (512 bytes) */ + ret = nand_change_read_column_op(chip, s * eccsize, p, + eccsize, false); + if (ret) + return ret; + + /* Read the corresponding ECC bytes */ + ret = nand_change_read_column_op(chip, i, ecc_code, + eccbytes, false); + if (ret) + return ret; + + /* Correct the data */ + stat = chip->ecc.correct(chip, p, ecc_code, ecc_calc); + if (stat == -EBADMSG) + /* Check for empty pages with bitflips */ + stat = nand_check_erased_ecc_chunk(p, eccsize, + ecc_code, eccbytes, + NULL, 0, + eccstrength); + + if (stat < 0) { + mtd->ecc_stats.failed++; + } else { + mtd->ecc_stats.corrected += stat; + max_bitflips = max_t(unsigned int, max_bitflips, stat); + } + } + + /* Read oob */ + if (oob_required) { + ret = nand_change_read_column_op(chip, mtd->writesize, + chip->oob_poi, mtd->oobsize, + false); + if (ret) + return ret; + } + + return max_bitflips; +} + +static void stm32_fmc2_nfc_read_data(struct nand_chip *chip, void *buf, + unsigned int len, bool force_8bit) +{ + struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller); + void __iomem *io_addr_r = nfc->data_base[nfc->cs_sel]; + + if (force_8bit && chip->options & NAND_BUSWIDTH_16) + /* Reconfigure bus width to 8-bit */ + stm32_fmc2_nfc_set_buswidth_16(nfc, false); + + if (!IS_ALIGNED((uintptr_t)buf, sizeof(u32))) { + if (!IS_ALIGNED((uintptr_t)buf, sizeof(u16)) && len) { + *(u8 *)buf = readb_relaxed(io_addr_r); + buf += sizeof(u8); + len -= sizeof(u8); + } + + if (!IS_ALIGNED((uintptr_t)buf, sizeof(u32)) && + len >= sizeof(u16)) { + *(u16 *)buf = readw_relaxed(io_addr_r); + buf += sizeof(u16); + len -= sizeof(u16); + } + } + + /* Buf is aligned */ + while (len >= sizeof(u32)) { + *(u32 *)buf = readl_relaxed(io_addr_r); + buf += sizeof(u32); + len -= sizeof(u32); + } + + /* Read remaining bytes */ + if (len >= sizeof(u16)) { + *(u16 *)buf = readw_relaxed(io_addr_r); + buf += sizeof(u16); + len -= sizeof(u16); + } + + if (len) + *(u8 *)buf = readb_relaxed(io_addr_r); + + if (force_8bit && chip->options & NAND_BUSWIDTH_16) + /* Reconfigure bus width to 16-bit */ + stm32_fmc2_nfc_set_buswidth_16(nfc, true); +} + +static void stm32_fmc2_nfc_write_data(struct nand_chip *chip, const void *buf, + unsigned int len, bool force_8bit) +{ + struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller); + void __iomem *io_addr_w = nfc->data_base[nfc->cs_sel]; + + if (force_8bit && chip->options & NAND_BUSWIDTH_16) + /* Reconfigure bus width to 8-bit */ + stm32_fmc2_nfc_set_buswidth_16(nfc, false); + + if (!IS_ALIGNED((uintptr_t)buf, sizeof(u32))) { + if (!IS_ALIGNED((uintptr_t)buf, sizeof(u16)) && len) { + writeb_relaxed(*(u8 *)buf, io_addr_w); + buf += sizeof(u8); + len -= sizeof(u8); + } + + if (!IS_ALIGNED((uintptr_t)buf, sizeof(u32)) && + len >= sizeof(u16)) { + writew_relaxed(*(u16 *)buf, io_addr_w); + buf += sizeof(u16); + len -= sizeof(u16); + } + } + + /* Buf is aligned */ + while (len >= sizeof(u32)) { + writel_relaxed(*(u32 *)buf, io_addr_w); + buf += sizeof(u32); + len -= sizeof(u32); + } + + /* Write remaining bytes */ + if (len >= sizeof(u16)) { + writew_relaxed(*(u16 *)buf, io_addr_w); + buf += sizeof(u16); + len -= sizeof(u16); + } + + if (len) + writeb_relaxed(*(u8 *)buf, io_addr_w); + + if (force_8bit && chip->options & NAND_BUSWIDTH_16) + /* Reconfigure bus width to 16-bit */ + stm32_fmc2_nfc_set_buswidth_16(nfc, true); +} + +static int stm32_fmc2_nfc_waitrdy(struct nand_chip *chip, + unsigned long timeout_ms) +{ + struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller); + const struct nand_sdr_timings *timings; + u32 isr, sr; + + /* Check if there is no pending requests to the NAND flash */ + if (regmap_read_poll_timeout(nfc->regmap, FMC2_SR, sr, + sr & FMC2_SR_NWRF, + 1000 * FMC2_TIMEOUT_MS)) + dev_warn(nfc->dev, "Waitrdy timeout\n"); + + /* Wait tWB before R/B# signal is low */ + timings = nand_get_sdr_timings(nand_get_interface_config(chip)); + ndelay(PSEC_TO_NSEC(timings->tWB_max)); + + /* R/B# signal is low, clear high level flag */ + regmap_write(nfc->regmap, FMC2_ICR, FMC2_ICR_CIHLF); + + /* Wait R/B# signal is high */ + return regmap_read_poll_timeout(nfc->regmap, FMC2_ISR, isr, + isr & FMC2_ISR_IHLF, + 1000 * FMC2_TIMEOUT_MS); +} + +static int stm32_fmc2_nfc_exec_op(struct nand_chip *chip, + const struct nand_operation *op, + bool check_only) +{ + struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller); + const struct nand_op_instr *instr = NULL; + unsigned int op_id, i, timeout; + int ret = 0; + + if (check_only) + return 0; + + stm32_fmc2_nfc_select_chip(chip, op->cs); + + for (op_id = 0; op_id < op->ninstrs; op_id++) { + instr = &op->instrs[op_id]; + + switch (instr->type) { + case NAND_OP_CMD_INSTR: + writeb_relaxed(instr->ctx.cmd.opcode, + nfc->cmd_base[nfc->cs_sel]); + break; + + case NAND_OP_ADDR_INSTR: + for (i = 0; i < instr->ctx.addr.naddrs; i++) + writeb_relaxed(instr->ctx.addr.addrs[i], + nfc->addr_base[nfc->cs_sel]); + break; + + case NAND_OP_DATA_IN_INSTR: + stm32_fmc2_nfc_read_data(chip, instr->ctx.data.buf.in, + instr->ctx.data.len, + instr->ctx.data.force_8bit); + break; + + case NAND_OP_DATA_OUT_INSTR: + stm32_fmc2_nfc_write_data(chip, instr->ctx.data.buf.out, + instr->ctx.data.len, + instr->ctx.data.force_8bit); + break; + + case NAND_OP_WAITRDY_INSTR: + timeout = instr->ctx.waitrdy.timeout_ms; + ret = stm32_fmc2_nfc_waitrdy(chip, timeout); + break; + } + } + + return ret; +} + +static void stm32_fmc2_nfc_init(struct stm32_fmc2_nfc *nfc) +{ + u32 pcr; + + regmap_read(nfc->regmap, FMC2_PCR, &pcr); + + /* Set CS used to undefined */ + nfc->cs_sel = -1; + + /* Enable wait feature and nand flash memory bank */ + pcr |= FMC2_PCR_PWAITEN; + pcr |= FMC2_PCR_PBKEN; + + /* Set buswidth to 8 bits mode for identification */ + pcr &= ~FMC2_PCR_PWID; + + /* ECC logic is disabled */ + pcr &= ~FMC2_PCR_ECCEN; + + /* Default mode */ + pcr &= ~FMC2_PCR_ECCALG; + pcr &= ~FMC2_PCR_BCHECC; + pcr &= ~FMC2_PCR_WEN; + + /* Set default ECC sector size */ + pcr &= ~FMC2_PCR_ECCSS; + pcr |= FIELD_PREP(FMC2_PCR_ECCSS, FMC2_PCR_ECCSS_2048); + + /* Set default tclr/tar timings */ + pcr &= ~FMC2_PCR_TCLR; + pcr |= FIELD_PREP(FMC2_PCR_TCLR, FMC2_PCR_TCLR_DEFAULT); + pcr &= ~FMC2_PCR_TAR; + pcr |= FIELD_PREP(FMC2_PCR_TAR, FMC2_PCR_TAR_DEFAULT); + + /* Enable FMC2 controller */ + if (nfc->dev == nfc->cdev) + regmap_update_bits(nfc->regmap, FMC2_BCR1, + FMC2_BCR1_FMC2EN, FMC2_BCR1_FMC2EN); + + regmap_write(nfc->regmap, FMC2_PCR, pcr); + regmap_write(nfc->regmap, FMC2_PMEM, FMC2_PMEM_DEFAULT); + regmap_write(nfc->regmap, FMC2_PATT, FMC2_PATT_DEFAULT); +} + +static void stm32_fmc2_nfc_calc_timings(struct nand_chip *chip, + const struct nand_sdr_timings *sdrt) +{ + struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller); + struct stm32_fmc2_nand *nand = to_fmc2_nand(chip); + struct stm32_fmc2_timings *tims = &nand->timings; + unsigned long hclk = clk_get_rate(nfc->clk); + unsigned long hclkp = NSEC_PER_SEC / (hclk / 1000); + unsigned long timing, tar, tclr, thiz, twait; + unsigned long tset_mem, tset_att, thold_mem, thold_att; + + tar = max_t(unsigned long, hclkp, sdrt->tAR_min); + timing = DIV_ROUND_UP(tar, hclkp) - 1; + tims->tar = min_t(unsigned long, timing, FMC2_PCR_TIMING_MASK); + + tclr = max_t(unsigned long, hclkp, sdrt->tCLR_min); + timing = DIV_ROUND_UP(tclr, hclkp) - 1; + tims->tclr = min_t(unsigned long, timing, FMC2_PCR_TIMING_MASK); + + tims->thiz = FMC2_THIZ; + thiz = (tims->thiz + 1) * hclkp; + + /* + * tWAIT > tRP + * tWAIT > tWP + * tWAIT > tREA + tIO + */ + twait = max_t(unsigned long, hclkp, sdrt->tRP_min); + twait = max_t(unsigned long, twait, sdrt->tWP_min); + twait = max_t(unsigned long, twait, sdrt->tREA_max + FMC2_TIO); + timing = DIV_ROUND_UP(twait, hclkp); + tims->twait = clamp_val(timing, 1, FMC2_PMEM_PATT_TIMING_MASK); + + /* + * tSETUP_MEM > tCS - tWAIT + * tSETUP_MEM > tALS - tWAIT + * tSETUP_MEM > tDS - (tWAIT - tHIZ) + */ + tset_mem = hclkp; + if (sdrt->tCS_min > twait && (tset_mem < sdrt->tCS_min - twait)) + tset_mem = sdrt->tCS_min - twait; + if (sdrt->tALS_min > twait && (tset_mem < sdrt->tALS_min - twait)) + tset_mem = sdrt->tALS_min - twait; + if (twait > thiz && (sdrt->tDS_min > twait - thiz) && + (tset_mem < sdrt->tDS_min - (twait - thiz))) + tset_mem = sdrt->tDS_min - (twait - thiz); + timing = DIV_ROUND_UP(tset_mem, hclkp); + tims->tset_mem = clamp_val(timing, 1, FMC2_PMEM_PATT_TIMING_MASK); + + /* + * tHOLD_MEM > tCH + * tHOLD_MEM > tREH - tSETUP_MEM + * tHOLD_MEM > max(tRC, tWC) - (tSETUP_MEM + tWAIT) + */ + thold_mem = max_t(unsigned long, hclkp, sdrt->tCH_min); + if (sdrt->tREH_min > tset_mem && + (thold_mem < sdrt->tREH_min - tset_mem)) + thold_mem = sdrt->tREH_min - tset_mem; + if ((sdrt->tRC_min > tset_mem + twait) && + (thold_mem < sdrt->tRC_min - (tset_mem + twait))) + thold_mem = sdrt->tRC_min - (tset_mem + twait); + if ((sdrt->tWC_min > tset_mem + twait) && + (thold_mem < sdrt->tWC_min - (tset_mem + twait))) + thold_mem = sdrt->tWC_min - (tset_mem + twait); + timing = DIV_ROUND_UP(thold_mem, hclkp); + tims->thold_mem = clamp_val(timing, 1, FMC2_PMEM_PATT_TIMING_MASK); + + /* + * tSETUP_ATT > tCS - tWAIT + * tSETUP_ATT > tCLS - tWAIT + * tSETUP_ATT > tALS - tWAIT + * tSETUP_ATT > tRHW - tHOLD_MEM + * tSETUP_ATT > tDS - (tWAIT - tHIZ) + */ + tset_att = hclkp; + if (sdrt->tCS_min > twait && (tset_att < sdrt->tCS_min - twait)) + tset_att = sdrt->tCS_min - twait; + if (sdrt->tCLS_min > twait && (tset_att < sdrt->tCLS_min - twait)) + tset_att = sdrt->tCLS_min - twait; + if (sdrt->tALS_min > twait && (tset_att < sdrt->tALS_min - twait)) + tset_att = sdrt->tALS_min - twait; + if (sdrt->tRHW_min > thold_mem && + (tset_att < sdrt->tRHW_min - thold_mem)) + tset_att = sdrt->tRHW_min - thold_mem; + if (twait > thiz && (sdrt->tDS_min > twait - thiz) && + (tset_att < sdrt->tDS_min - (twait - thiz))) + tset_att = sdrt->tDS_min - (twait - thiz); + timing = DIV_ROUND_UP(tset_att, hclkp); + tims->tset_att = clamp_val(timing, 1, FMC2_PMEM_PATT_TIMING_MASK); + + /* + * tHOLD_ATT > tALH + * tHOLD_ATT > tCH + * tHOLD_ATT > tCLH + * tHOLD_ATT > tCOH + * tHOLD_ATT > tDH + * tHOLD_ATT > tWB + tIO + tSYNC - tSETUP_MEM + * tHOLD_ATT > tADL - tSETUP_MEM + * tHOLD_ATT > tWH - tSETUP_MEM + * tHOLD_ATT > tWHR - tSETUP_MEM + * tHOLD_ATT > tRC - (tSETUP_ATT + tWAIT) + * tHOLD_ATT > tWC - (tSETUP_ATT + tWAIT) + */ + thold_att = max_t(unsigned long, hclkp, sdrt->tALH_min); + thold_att = max_t(unsigned long, thold_att, sdrt->tCH_min); + thold_att = max_t(unsigned long, thold_att, sdrt->tCLH_min); + thold_att = max_t(unsigned long, thold_att, sdrt->tCOH_min); + thold_att = max_t(unsigned long, thold_att, sdrt->tDH_min); + if ((sdrt->tWB_max + FMC2_TIO + FMC2_TSYNC > tset_mem) && + (thold_att < sdrt->tWB_max + FMC2_TIO + FMC2_TSYNC - tset_mem)) + thold_att = sdrt->tWB_max + FMC2_TIO + FMC2_TSYNC - tset_mem; + if (sdrt->tADL_min > tset_mem && + (thold_att < sdrt->tADL_min - tset_mem)) + thold_att = sdrt->tADL_min - tset_mem; + if (sdrt->tWH_min > tset_mem && + (thold_att < sdrt->tWH_min - tset_mem)) + thold_att = sdrt->tWH_min - tset_mem; + if (sdrt->tWHR_min > tset_mem && + (thold_att < sdrt->tWHR_min - tset_mem)) + thold_att = sdrt->tWHR_min - tset_mem; + if ((sdrt->tRC_min > tset_att + twait) && + (thold_att < sdrt->tRC_min - (tset_att + twait))) + thold_att = sdrt->tRC_min - (tset_att + twait); + if ((sdrt->tWC_min > tset_att + twait) && + (thold_att < sdrt->tWC_min - (tset_att + twait))) + thold_att = sdrt->tWC_min - (tset_att + twait); + timing = DIV_ROUND_UP(thold_att, hclkp); + tims->thold_att = clamp_val(timing, 1, FMC2_PMEM_PATT_TIMING_MASK); +} + +static int stm32_fmc2_nfc_setup_interface(struct nand_chip *chip, int chipnr, + const struct nand_interface_config *conf) +{ + const struct nand_sdr_timings *sdrt; + + sdrt = nand_get_sdr_timings(conf); + if (IS_ERR(sdrt)) + return PTR_ERR(sdrt); + + if (conf->timings.mode > 3) + return -EOPNOTSUPP; + + if (chipnr == NAND_DATA_IFACE_CHECK_ONLY) + return 0; + + stm32_fmc2_nfc_calc_timings(chip, sdrt); + stm32_fmc2_nfc_timings_init(chip); + + return 0; +} + +static void stm32_fmc2_nfc_nand_callbacks_setup(struct nand_chip *chip) +{ + /* + * Specific callbacks to read/write a page depending on + * the mode (polling/sequencer) and the algo used (Hamming, BCH). + */ + chip->ecc.hwctl = stm32_fmc2_nfc_hwctl; + if (chip->ecc.strength == FMC2_ECC_HAM) { + /* Hamming is used */ + chip->ecc.calculate = stm32_fmc2_nfc_ham_calculate; + chip->ecc.correct = stm32_fmc2_nfc_ham_correct; + chip->ecc.options |= NAND_ECC_GENERIC_ERASED_CHECK; + } else { + /* BCH is used */ + chip->ecc.calculate = stm32_fmc2_nfc_bch_calculate; + chip->ecc.correct = stm32_fmc2_nfc_bch_correct; + chip->ecc.read_page = stm32_fmc2_nfc_read_page; + } + + /* Specific configurations depending on the algo used */ + if (chip->ecc.strength == FMC2_ECC_HAM) + chip->ecc.bytes = chip->options & NAND_BUSWIDTH_16 ? 4 : 3; + else if (chip->ecc.strength == FMC2_ECC_BCH8) + chip->ecc.bytes = chip->options & NAND_BUSWIDTH_16 ? 14 : 13; + else + chip->ecc.bytes = chip->options & NAND_BUSWIDTH_16 ? 8 : 7; +} + +static int stm32_fmc2_nfc_ooblayout_ecc(struct mtd_info *mtd, int section, + struct mtd_oob_region *oobregion) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct nand_ecc_ctrl *ecc = &chip->ecc; + + if (section) + return -ERANGE; + + oobregion->length = ecc->total; + oobregion->offset = FMC2_BBM_LEN; + + return 0; +} + +static int stm32_fmc2_nfc_ooblayout_free(struct mtd_info *mtd, int section, + struct mtd_oob_region *oobregion) +{ + struct nand_chip *chip = mtd_to_nand(mtd); + struct nand_ecc_ctrl *ecc = &chip->ecc; + + if (section) + return -ERANGE; + + oobregion->length = mtd->oobsize - ecc->total - FMC2_BBM_LEN; + oobregion->offset = ecc->total + FMC2_BBM_LEN; + + return 0; +} + +static const struct mtd_ooblayout_ops stm32_fmc2_nfc_ooblayout_ops = { + .ecc = stm32_fmc2_nfc_ooblayout_ecc, + .free = stm32_fmc2_nfc_ooblayout_free, +}; + +static int stm32_fmc2_nfc_calc_ecc_bytes(int step_size, int strength) +{ + /* Hamming */ + if (strength == FMC2_ECC_HAM) + return 4; + + /* BCH8 */ + if (strength == FMC2_ECC_BCH8) + return 14; + + /* BCH4 */ + return 8; +} + +NAND_ECC_CAPS_SINGLE(stm32_fmc2_nfc_ecc_caps, stm32_fmc2_nfc_calc_ecc_bytes, + FMC2_ECC_STEP_SIZE, + FMC2_ECC_HAM, FMC2_ECC_BCH4, FMC2_ECC_BCH8); + +static int stm32_fmc2_nfc_attach_chip(struct nand_chip *chip) +{ + struct stm32_fmc2_nfc *nfc = to_stm32_nfc(chip->controller); + struct mtd_info *mtd = nand_to_mtd(chip); + int ret; + + /* Default ECC settings in case they are not set in the device tree */ + if (!chip->ecc.size) + chip->ecc.size = FMC2_ECC_STEP_SIZE; + + if (!chip->ecc.strength) + chip->ecc.strength = FMC2_ECC_BCH8; + + ret = nand_ecc_choose_conf(chip, &stm32_fmc2_nfc_ecc_caps, + mtd->oobsize - FMC2_BBM_LEN); + if (ret) { + dev_err(nfc->dev, "no valid ECC settings set\n"); + return ret; + } + + if (mtd->writesize / chip->ecc.size > FMC2_MAX_SG) { + dev_err(nfc->dev, "nand page size is not supported\n"); + return -EINVAL; + } + + if (chip->bbt_options & NAND_BBT_USE_FLASH) + chip->bbt_options |= NAND_BBT_NO_OOB; + + stm32_fmc2_nfc_nand_callbacks_setup(chip); + + mtd_set_ooblayout(mtd, &stm32_fmc2_nfc_ooblayout_ops); + + stm32_fmc2_nfc_setup(chip); + + return 0; +} + +static const struct nand_controller_ops stm32_fmc2_nfc_controller_ops = { + .attach_chip = stm32_fmc2_nfc_attach_chip, + .exec_op = stm32_fmc2_nfc_exec_op, + .setup_interface = stm32_fmc2_nfc_setup_interface, +}; + +static void stm32_fmc2_nfc_wp_enable(struct stm32_fmc2_nand *nand) +{ + if (nand->wp_gpio) + gpiod_set_value(nand->wp_gpio, 1); +} + +static void stm32_fmc2_nfc_wp_disable(struct stm32_fmc2_nand *nand) +{ + if (nand->wp_gpio) + gpiod_set_value(nand->wp_gpio, 0); +} + +static int stm32_fmc2_nfc_parse_child(struct stm32_fmc2_nfc *nfc, + struct device_node *dn) +{ + struct stm32_fmc2_nand *nand = &nfc->nand; + u32 cs; + int ret, i; + + if (!of_get_property(dn, "reg", &nand->ncs)) + return -EINVAL; + + nand->ncs /= sizeof(u32); + if (!nand->ncs) { + dev_err(nfc->dev, "invalid reg property size\n"); + return -EINVAL; + } + + for (i = 0; i < nand->ncs; i++) { + ret = of_property_read_u32_index(dn, "reg", i, &cs); + if (ret) { + dev_err(nfc->dev, "could not retrieve reg property: %d\n", + ret); + return ret; + } + + if (cs >= FMC2_MAX_CE) { + dev_err(nfc->dev, "invalid reg value: %d\n", cs); + return -EINVAL; + } + + if (nfc->cs_assigned & BIT(cs)) { + dev_err(nfc->dev, "cs already assigned: %d\n", cs); + return -EINVAL; + } + + nfc->cs_assigned |= BIT(cs); + nand->cs_used[i] = cs; + } + + nand->wp_gpio = dev_gpiod_get(nfc->dev, dn, "wp", GPIOD_OUT_HIGH, "wp"); + if (IS_ERR(nand->wp_gpio)) { + ret = PTR_ERR(nand->wp_gpio); + if (ret != -ENOENT) + return dev_err_probe(nfc->dev, ret, + "failed to request WP GPIO\n"); + + nand->wp_gpio = NULL; + } + + nand_set_flash_node(&nand->chip, dn); + + return 0; +} + +static int stm32_fmc2_nfc_parse_dt(struct stm32_fmc2_nfc *nfc) +{ + struct device_node *dn = nfc->dev->of_node; + struct device_node *child; + int nchips = of_get_child_count(dn); + int ret = 0; + + if (!nchips) { + dev_err(nfc->dev, "NAND chip not defined\n"); + return -EINVAL; + } + + if (nchips > 1) { + dev_err(nfc->dev, "too many NAND chips defined\n"); + return -EINVAL; + } + + for_each_child_of_node(dn, child) { + ret = stm32_fmc2_nfc_parse_child(nfc, child); + if (ret < 0) { + of_node_put(child); + return ret; + } + } + + return ret; +} + +static int stm32_fmc2_nfc_set_cdev(struct stm32_fmc2_nfc *nfc) +{ + struct device *dev = nfc->dev; + bool ebi_found = false; + + if (dev->parent && of_device_is_compatible(dev->parent->of_node, + "st,stm32mp1-fmc2-ebi")) + ebi_found = true; + + if (of_device_is_compatible(dev->of_node, "st,stm32mp1-fmc2-nfc")) { + if (ebi_found) { + nfc->cdev = dev->parent; + + return 0; + } + + return -EINVAL; + } + + if (ebi_found) + return -EINVAL; + + nfc->cdev = dev; + + return 0; +} + +static int __init stm32_fmc2_nfc_probe(struct device *dev) +{ + struct stm32_fmc2_nfc *nfc; + struct stm32_fmc2_nand *nand; + struct mtd_info *mtd; + struct nand_chip *chip; + struct resource cres; + int chip_cs, mem_region, ret; + int start_region = 0; + + nfc = kzalloc(sizeof(*nfc), GFP_KERNEL); + if (!nfc) + return -ENOMEM; + + nfc->dev = dev; + nand_controller_init(&nfc->base); + nfc->base.ops = &stm32_fmc2_nfc_controller_ops; + + ret = stm32_fmc2_nfc_set_cdev(nfc); + if (ret) + return ret; + + ret = stm32_fmc2_nfc_parse_dt(nfc); + if (ret) + return ret; + + ret = of_address_to_resource(nfc->cdev->of_node, 0, &cres); + if (ret) + return ret; + + nfc->regmap = device_node_to_regmap(nfc->cdev->of_node); + if (IS_ERR(nfc->regmap)) + return PTR_ERR(nfc->regmap); + + if (nfc->dev == nfc->cdev) + start_region = 1; + + for (chip_cs = 0, mem_region = start_region; chip_cs < FMC2_MAX_CE; + chip_cs++, mem_region += 3) { + if (!(nfc->cs_assigned & BIT(chip_cs))) + continue; + + nfc->data_base[chip_cs] = of_iomap(dev->of_node, mem_region); + if (IS_ERR(nfc->data_base[chip_cs])) + return PTR_ERR(nfc->data_base[chip_cs]); + + nfc->cmd_base[chip_cs] = of_iomap(dev->of_node, mem_region + 1); + if (IS_ERR(nfc->cmd_base[chip_cs])) + return PTR_ERR(nfc->cmd_base[chip_cs]); + + nfc->addr_base[chip_cs] = of_iomap(dev->of_node, mem_region + 2); + if (IS_ERR(nfc->addr_base[chip_cs])) + return PTR_ERR(nfc->addr_base[chip_cs]); + } + + nfc->clk = clk_get(nfc->cdev, NULL); + if (IS_ERR(nfc->clk)) + return PTR_ERR(nfc->clk); + + ret = clk_prepare_enable(nfc->clk); + if (ret) { + dev_err(dev, "can not enable the clock\n"); + return ret; + } + + ret = device_reset_us(dev, 2); + if (ret) + goto err_clk_disable; + + stm32_fmc2_nfc_init(nfc); + + nand = &nfc->nand; + chip = &nand->chip; + mtd = nand_to_mtd(chip); + mtd->dev.parent = dev; + + chip->controller = &nfc->base; + chip->options |= NAND_BUSWIDTH_AUTO | NAND_NO_SUBPAGE_WRITE; + + /* Default ECC settings */ + chip->ecc.mode = NAND_ECC_HW; + chip->ecc.size = FMC2_ECC_STEP_SIZE; + chip->ecc.strength = FMC2_ECC_BCH8; + + stm32_fmc2_nfc_wp_disable(nand); + + /* Scan to find existence of the device */ + ret = nand_scan(chip, nand->ncs); + if (ret) + goto err_wp_enable; + + ret = add_mtd_nand_device(mtd, "nand"); + if (ret) + goto err_nand_cleanup; + + return 0; + +err_nand_cleanup: + nand_cleanup(chip); + +err_wp_enable: + stm32_fmc2_nfc_wp_enable(nand); + +err_clk_disable: + clk_disable_unprepare(nfc->clk); + + return ret; +} + +static __maybe_unused struct of_device_id stm32_fmc2_nfc_match[] = { + { .compatible = "st,stm32mp15-fmc2", }, + { .compatible = "st,stm32mp1-fmc2-nfc", }, + { } +}; +MODULE_DEVICE_TABLE(of, stm32_fmc2_nfc_match); + +static struct driver stm32_fmc2_nfc_driver = { + .name = "stm32_fmc2_nfc", + .probe = stm32_fmc2_nfc_probe, + .of_compatible = DRV_OF_COMPAT(stm32_fmc2_nfc_match), +}; +coredevice_platform_driver(stm32_fmc2_nfc_driver); -- 2.39.1
