// SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause /* * Copyright (C) STMicroelectronics 2019 * Author: Christophe Kerello */ #include #include #include #include #include #include #include #include #include /* Bad block marker length */ #define FMC2_BBM_LEN 2 /* ECC step size */ #define FMC2_ECC_STEP_SIZE 512 /* Command delay */ #define FMC2_RB_DELAY_US 30 /* Max chip enable */ #define FMC2_MAX_CE 2 /* 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_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_MASK GENMASK(5, 4) #define FMC2_PCR_PWID(x) (((x) & 0x3) << 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_MASK GENMASK(12, 9) #define FMC2_PCR_TCLR(x) (((x) & 0xf) << 9) #define FMC2_PCR_TCLR_DEFAULT 0xf #define FMC2_PCR_TAR_MASK GENMASK(16, 13) #define FMC2_PCR_TAR(x) (((x) & 0xf) << 13) #define FMC2_PCR_TAR_DEFAULT 0xf #define FMC2_PCR_ECCSS_MASK GENMASK(19, 17) #define FMC2_PCR_ECCSS(x) (((x) & 0x7) << 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(x) (((x) & 0xff) << 0) #define FMC2_PMEM_MEMWAIT(x) (((x) & 0xff) << 8) #define FMC2_PMEM_MEMHOLD(x) (((x) & 0xff) << 16) #define FMC2_PMEM_MEMHIZ(x) (((x) & 0xff) << 24) #define FMC2_PMEM_DEFAULT 0x0a0a0a0a /* Register: FMC2_PATT */ #define FMC2_PATT_ATTSET(x) (((x) & 0xff) << 0) #define FMC2_PATT_ATTWAIT(x) (((x) & 0xff) << 8) #define FMC2_PATT_ATTHOLD(x) (((x) & 0xff) << 16) #define FMC2_PATT_ATTHIZ(x) (((x) & 0xff) << 24) #define FMC2_PATT_DEFAULT 0x0a0a0a0a /* Register: FMC2_BCHISR */ #define FMC2_BCHISR_DERF BIT(1) #define FMC2_BCHISR_EPBRF 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_MASK GENMASK(7, 4) #define FMC2_BCHDSR0_DEN_SHIFT 4 /* Register: FMC2_BCHDSR1 */ #define FMC2_BCHDSR1_EBP1_MASK GENMASK(12, 0) #define FMC2_BCHDSR1_EBP2_MASK GENMASK(28, 16) #define FMC2_BCHDSR1_EBP2_SHIFT 16 /* Register: FMC2_BCHDSR2 */ #define FMC2_BCHDSR2_EBP3_MASK GENMASK(12, 0) #define FMC2_BCHDSR2_EBP4_MASK GENMASK(28, 16) #define FMC2_BCHDSR2_EBP4_SHIFT 16 /* Register: FMC2_BCHDSR3 */ #define FMC2_BCHDSR3_EBP5_MASK GENMASK(12, 0) #define FMC2_BCHDSR3_EBP6_MASK GENMASK(28, 16) #define FMC2_BCHDSR3_EBP6_SHIFT 16 /* Register: FMC2_BCHDSR4 */ #define FMC2_BCHDSR4_EBP7_MASK GENMASK(12, 0) #define FMC2_BCHDSR4_EBP8_MASK GENMASK(28, 16) #define FMC2_BCHDSR4_EBP8_SHIFT 16 #define FMC2_NSEC_PER_SEC 1000000000L 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 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_hw_control base; struct stm32_fmc2_nand nand; struct nand_ecclayout ecclayout; void __iomem *io_base; 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_hw_control *base) { return container_of(base, struct stm32_fmc2_nfc, base); } /* Timings configuration */ static void stm32_fmc2_timings_init(struct nand_chip *chip) { struct stm32_fmc2_nfc *fmc2 = to_stm32_nfc(chip->controller); struct stm32_fmc2_nand *nand = to_fmc2_nand(chip); struct stm32_fmc2_timings *timings = &nand->timings; u32 pcr = readl(fmc2->io_base + FMC2_PCR); u32 pmem, patt; /* Set tclr/tar timings */ pcr &= ~FMC2_PCR_TCLR_MASK; pcr |= FMC2_PCR_TCLR(timings->tclr); pcr &= ~FMC2_PCR_TAR_MASK; pcr |= FMC2_PCR_TAR(timings->tar); /* Set tset/twait/thold/thiz timings in common bank */ pmem = FMC2_PMEM_MEMSET(timings->tset_mem); pmem |= FMC2_PMEM_MEMWAIT(timings->twait); pmem |= FMC2_PMEM_MEMHOLD(timings->thold_mem); pmem |= FMC2_PMEM_MEMHIZ(timings->thiz); /* Set tset/twait/thold/thiz timings in attribut bank */ patt = FMC2_PATT_ATTSET(timings->tset_att); patt |= FMC2_PATT_ATTWAIT(timings->twait); patt |= FMC2_PATT_ATTHOLD(timings->thold_att); patt |= FMC2_PATT_ATTHIZ(timings->thiz); writel(pcr, fmc2->io_base + FMC2_PCR); writel(pmem, fmc2->io_base + FMC2_PMEM); writel(patt, fmc2->io_base + FMC2_PATT); } /* Controller configuration */ static void stm32_fmc2_setup(struct nand_chip *chip) { struct stm32_fmc2_nfc *fmc2 = to_stm32_nfc(chip->controller); u32 pcr = readl(fmc2->io_base + FMC2_PCR); /* Configure ECC algorithm (default configuration is Hamming) */ pcr &= ~FMC2_PCR_ECCALG; pcr &= ~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 &= ~FMC2_PCR_PWID_MASK; if (chip->options & NAND_BUSWIDTH_16) pcr |= FMC2_PCR_PWID(FMC2_PCR_PWID_BUSWIDTH_16); /* Set ECC sector size */ pcr &= ~FMC2_PCR_ECCSS_MASK; pcr |= FMC2_PCR_ECCSS(FMC2_PCR_ECCSS_512); writel(pcr, fmc2->io_base + FMC2_PCR); } /* Select target */ static void stm32_fmc2_select_chip(struct mtd_info *mtd, int chipnr) { struct nand_chip *chip = mtd_to_nand(mtd); struct stm32_fmc2_nfc *fmc2 = to_stm32_nfc(chip->controller); struct stm32_fmc2_nand *nand = to_fmc2_nand(chip); if (chipnr < 0 || chipnr >= nand->ncs) return; if (nand->cs_used[chipnr] == fmc2->cs_sel) return; fmc2->cs_sel = nand->cs_used[chipnr]; chip->IO_ADDR_R = fmc2->data_base[fmc2->cs_sel]; chip->IO_ADDR_W = fmc2->data_base[fmc2->cs_sel]; /* FMC2 setup routine */ stm32_fmc2_setup(chip); /* Apply timings */ stm32_fmc2_timings_init(chip); } /* Set bus width to 16-bit or 8-bit */ static void stm32_fmc2_set_buswidth_16(struct stm32_fmc2_nfc *fmc2, bool set) { u32 pcr = readl(fmc2->io_base + FMC2_PCR); pcr &= ~FMC2_PCR_PWID_MASK; if (set) pcr |= FMC2_PCR_PWID(FMC2_PCR_PWID_BUSWIDTH_16); writel(pcr, fmc2->io_base + FMC2_PCR); } /* Enable/disable ECC */ static void stm32_fmc2_set_ecc(struct stm32_fmc2_nfc *fmc2, bool enable) { u32 pcr = readl(fmc2->io_base + FMC2_PCR); pcr &= ~FMC2_PCR_ECCEN; if (enable) pcr |= FMC2_PCR_ECCEN; writel(pcr, fmc2->io_base + FMC2_PCR); } /* Clear irq sources in case of bch is used */ static inline void stm32_fmc2_clear_bch_irq(struct stm32_fmc2_nfc *fmc2) { writel(FMC2_BCHICR_CLEAR_IRQ, fmc2->io_base + FMC2_BCHICR); } /* Send command and address cycles */ static void stm32_fmc2_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) { struct nand_chip *chip = mtd_to_nand(mtd); struct stm32_fmc2_nfc *fmc2 = to_stm32_nfc(chip->controller); if (cmd == NAND_CMD_NONE) return; if (ctrl & NAND_CLE) { writeb(cmd, fmc2->cmd_base[fmc2->cs_sel]); return; } writeb(cmd, fmc2->addr_base[fmc2->cs_sel]); } /* * 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_hwctl(struct mtd_info *mtd, int mode) { struct nand_chip *chip = mtd_to_nand(mtd); struct stm32_fmc2_nfc *fmc2 = to_stm32_nfc(chip->controller); stm32_fmc2_set_ecc(fmc2, false); if (chip->ecc.strength != FMC2_ECC_HAM) { u32 pcr = readl(fmc2->io_base + FMC2_PCR); if (mode == NAND_ECC_WRITE) pcr |= FMC2_PCR_WEN; else pcr &= ~FMC2_PCR_WEN; writel(pcr, fmc2->io_base + FMC2_PCR); stm32_fmc2_clear_bch_irq(fmc2); } stm32_fmc2_set_ecc(fmc2, true); } /* * ECC Hamming calculation * ECC is 3 bytes for 512 bytes of data (supports error correction up to * max of 1-bit) */ static int stm32_fmc2_ham_calculate(struct mtd_info *mtd, const u8 *data, u8 *ecc) { struct nand_chip *chip = mtd_to_nand(mtd); struct stm32_fmc2_nfc *fmc2 = to_stm32_nfc(chip->controller); u32 heccr, sr; int ret; ret = readl_poll_timeout(fmc2->io_base + FMC2_SR, sr, sr & FMC2_SR_NWRF, 10000); if (ret < 0) { pr_err("Ham timeout\n"); return ret; } heccr = readl(fmc2->io_base + FMC2_HECCR); ecc[0] = heccr; ecc[1] = heccr >> 8; ecc[2] = heccr >> 16; /* Disable ecc */ stm32_fmc2_set_ecc(fmc2, false); return 0; } static int stm32_fmc2_ham_correct(struct mtd_info *mtd, 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; 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; 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_bch_calculate(struct mtd_info *mtd, const u8 *data, u8 *ecc) { struct nand_chip *chip = mtd_to_nand(mtd); struct stm32_fmc2_nfc *fmc2 = to_stm32_nfc(chip->controller); u32 bchpbr, bchisr; int ret; /* Wait until the BCH code is ready */ ret = readl_poll_timeout(fmc2->io_base + FMC2_BCHISR, bchisr, bchisr & FMC2_BCHISR_EPBRF, 10000); if (ret < 0) { pr_err("Bch timeout\n"); return ret; } /* Read parity bits */ bchpbr = readl(fmc2->io_base + FMC2_BCHPBR1); ecc[0] = bchpbr; ecc[1] = bchpbr >> 8; ecc[2] = bchpbr >> 16; ecc[3] = bchpbr >> 24; bchpbr = readl(fmc2->io_base + FMC2_BCHPBR2); ecc[4] = bchpbr; ecc[5] = bchpbr >> 8; ecc[6] = bchpbr >> 16; if (chip->ecc.strength == FMC2_ECC_BCH8) { ecc[7] = bchpbr >> 24; bchpbr = readl(fmc2->io_base + FMC2_BCHPBR3); ecc[8] = bchpbr; ecc[9] = bchpbr >> 8; ecc[10] = bchpbr >> 16; ecc[11] = bchpbr >> 24; bchpbr = readl(fmc2->io_base + FMC2_BCHPBR4); ecc[12] = bchpbr; } /* Disable ecc */ stm32_fmc2_set_ecc(fmc2, false); return 0; } /* BCH algorithm correction */ static int stm32_fmc2_bch_correct(struct mtd_info *mtd, u8 *dat, u8 *read_ecc, u8 *calc_ecc) { struct nand_chip *chip = mtd_to_nand(mtd); struct stm32_fmc2_nfc *fmc2 = to_stm32_nfc(chip->controller); u32 bchdsr0, bchdsr1, bchdsr2, bchdsr3, bchdsr4, bchisr; u16 pos[8]; int i, ret, den, eccsize = chip->ecc.size; unsigned int nb_errs = 0; /* Wait until the decoding error is ready */ ret = readl_poll_timeout(fmc2->io_base + FMC2_BCHISR, bchisr, bchisr & FMC2_BCHISR_DERF, 10000); if (ret < 0) { pr_err("Bch timeout\n"); return ret; } bchdsr0 = readl(fmc2->io_base + FMC2_BCHDSR0); bchdsr1 = readl(fmc2->io_base + FMC2_BCHDSR1); bchdsr2 = readl(fmc2->io_base + FMC2_BCHDSR2); bchdsr3 = readl(fmc2->io_base + FMC2_BCHDSR3); bchdsr4 = readl(fmc2->io_base + FMC2_BCHDSR4); /* Disable ECC */ stm32_fmc2_set_ecc(fmc2, false); /* 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] = bchdsr1 & FMC2_BCHDSR1_EBP1_MASK; pos[1] = (bchdsr1 & FMC2_BCHDSR1_EBP2_MASK) >> FMC2_BCHDSR1_EBP2_SHIFT; pos[2] = bchdsr2 & FMC2_BCHDSR2_EBP3_MASK; pos[3] = (bchdsr2 & FMC2_BCHDSR2_EBP4_MASK) >> FMC2_BCHDSR2_EBP4_SHIFT; pos[4] = bchdsr3 & FMC2_BCHDSR3_EBP5_MASK; pos[5] = (bchdsr3 & FMC2_BCHDSR3_EBP6_MASK) >> FMC2_BCHDSR3_EBP6_SHIFT; pos[6] = bchdsr4 & FMC2_BCHDSR4_EBP7_MASK; pos[7] = (bchdsr4 & FMC2_BCHDSR4_EBP8_MASK) >> FMC2_BCHDSR4_EBP8_SHIFT; den = (bchdsr0 & FMC2_BCHDSR0_DEN_MASK) >> FMC2_BCHDSR0_DEN_SHIFT; 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_read_page(struct mtd_info *mtd, struct nand_chip *chip, u8 *buf, int oob_required, int page) { int 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->buffers->ecccalc; u8 *ecc_code = chip->buffers->ecccode; unsigned int max_bitflips = 0; for (i = mtd->writesize + FMC2_BBM_LEN, s = 0; s < eccsteps; s++, i += eccbytes, p += eccsize) { chip->ecc.hwctl(mtd, NAND_ECC_READ); /* Read the nand page sector (512 bytes) */ chip->cmdfunc(mtd, NAND_CMD_RNDOUT, s * eccsize, -1); chip->read_buf(mtd, p, eccsize); /* Read the corresponding ECC bytes */ chip->cmdfunc(mtd, NAND_CMD_RNDOUT, i, -1); chip->read_buf(mtd, ecc_code, eccbytes); /* Correct the data */ stat = chip->ecc.correct(mtd, 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) { chip->cmdfunc(mtd, NAND_CMD_RNDOUT, mtd->writesize, -1); chip->read_buf(mtd, chip->oob_poi, mtd->oobsize); } return max_bitflips; } /* Controller initialization */ static void stm32_fmc2_init(struct stm32_fmc2_nfc *fmc2) { u32 pcr = readl(fmc2->io_base + FMC2_PCR); u32 bcr1 = readl(fmc2->io_base + FMC2_BCR1); /* Set CS used to undefined */ fmc2->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_MASK; /* 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_MASK; pcr |= FMC2_PCR_ECCSS(FMC2_PCR_ECCSS_2048); /* Set default tclr/tar timings */ pcr &= ~FMC2_PCR_TCLR_MASK; pcr |= FMC2_PCR_TCLR(FMC2_PCR_TCLR_DEFAULT); pcr &= ~FMC2_PCR_TAR_MASK; pcr |= FMC2_PCR_TAR(FMC2_PCR_TAR_DEFAULT); /* Enable FMC2 controller */ bcr1 |= FMC2_BCR1_FMC2EN; writel(bcr1, fmc2->io_base + FMC2_BCR1); writel(pcr, fmc2->io_base + FMC2_PCR); writel(FMC2_PMEM_DEFAULT, fmc2->io_base + FMC2_PMEM); writel(FMC2_PATT_DEFAULT, fmc2->io_base + FMC2_PATT); } /* Controller timings */ static void stm32_fmc2_calc_timings(struct nand_chip *chip, const struct nand_sdr_timings *sdrt) { struct stm32_fmc2_nfc *fmc2 = 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(&fmc2->clk); unsigned long hclkp = FMC2_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_setup_interface(struct mtd_info *mtd, int chipnr, const struct nand_data_interface *conf) { struct nand_chip *chip = mtd_to_nand(mtd); const struct nand_sdr_timings *sdrt; sdrt = nand_get_sdr_timings(conf); if (IS_ERR(sdrt)) return PTR_ERR(sdrt); if (chipnr == NAND_DATA_IFACE_CHECK_ONLY) return 0; stm32_fmc2_calc_timings(chip, sdrt); /* Apply timings */ stm32_fmc2_timings_init(chip); return 0; } /* NAND callbacks setup */ static void stm32_fmc2_nand_callbacks_setup(struct nand_chip *chip) { chip->ecc.hwctl = stm32_fmc2_hwctl; /* * Specific callbacks to read/write a page depending on * the algo used (Hamming, BCH). */ if (chip->ecc.strength == FMC2_ECC_HAM) { /* Hamming is used */ chip->ecc.calculate = stm32_fmc2_ham_calculate; chip->ecc.correct = stm32_fmc2_ham_correct; chip->ecc.bytes = chip->options & NAND_BUSWIDTH_16 ? 4 : 3; chip->ecc.options |= NAND_ECC_GENERIC_ERASED_CHECK; return; } /* BCH is used */ chip->ecc.read_page = stm32_fmc2_read_page; chip->ecc.calculate = stm32_fmc2_bch_calculate; chip->ecc.correct = stm32_fmc2_bch_correct; 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; } /* FMC2 caps */ static int stm32_fmc2_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_ecc_caps, stm32_fmc2_calc_ecc_bytes, FMC2_ECC_STEP_SIZE, FMC2_ECC_HAM, FMC2_ECC_BCH4, FMC2_ECC_BCH8); /* FMC2 probe */ static int stm32_fmc2_parse_child(struct stm32_fmc2_nfc *fmc2, ofnode node) { struct stm32_fmc2_nand *nand = &fmc2->nand; u32 cs[FMC2_MAX_CE]; int ret, i; if (!ofnode_get_property(node, "reg", &nand->ncs)) return -EINVAL; nand->ncs /= sizeof(u32); if (!nand->ncs) { pr_err("Invalid reg property size\n"); return -EINVAL; } ret = ofnode_read_u32_array(node, "reg", cs, nand->ncs); if (ret < 0) { pr_err("Could not retrieve reg property\n"); return -EINVAL; } for (i = 0; i < nand->ncs; i++) { if (cs[i] > FMC2_MAX_CE) { pr_err("Invalid reg value: %d\n", nand->cs_used[i]); return -EINVAL; } if (fmc2->cs_assigned & BIT(cs[i])) { pr_err("Cs already assigned: %d\n", nand->cs_used[i]); return -EINVAL; } fmc2->cs_assigned |= BIT(cs[i]); nand->cs_used[i] = cs[i]; } nand->chip.flash_node = ofnode_to_offset(node); return 0; } static int stm32_fmc2_parse_dt(struct udevice *dev, struct stm32_fmc2_nfc *fmc2) { ofnode child; int ret, nchips = 0; dev_for_each_subnode(child, dev) nchips++; if (!nchips) { pr_err("NAND chip not defined\n"); return -EINVAL; } if (nchips > 1) { pr_err("Too many NAND chips defined\n"); return -EINVAL; } dev_for_each_subnode(child, dev) { ret = stm32_fmc2_parse_child(fmc2, child); if (ret) return ret; } return 0; } static int stm32_fmc2_probe(struct udevice *dev) { struct stm32_fmc2_nfc *fmc2 = dev_get_priv(dev); struct stm32_fmc2_nand *nand = &fmc2->nand; struct nand_chip *chip = &nand->chip; struct mtd_info *mtd = &chip->mtd; struct nand_ecclayout *ecclayout; struct resource resource; struct reset_ctl reset; int oob_index, chip_cs, mem_region, ret; unsigned int i; spin_lock_init(&fmc2->controller.lock); init_waitqueue_head(&fmc2->controller.wq); ret = stm32_fmc2_parse_dt(dev, fmc2); if (ret) return ret; /* Get resources */ ret = dev_read_resource(dev, 0, &resource); if (ret) { pr_err("Resource io_base not found"); return ret; } fmc2->io_base = (void __iomem *)resource.start; for (chip_cs = 0, mem_region = 1; chip_cs < FMC2_MAX_CE; chip_cs++, mem_region += 3) { if (!(fmc2->cs_assigned & BIT(chip_cs))) continue; ret = dev_read_resource(dev, mem_region, &resource); if (ret) { pr_err("Resource data_base not found for cs%d", chip_cs); return ret; } fmc2->data_base[chip_cs] = (void __iomem *)resource.start; ret = dev_read_resource(dev, mem_region + 1, &resource); if (ret) { pr_err("Resource cmd_base not found for cs%d", chip_cs); return ret; } fmc2->cmd_base[chip_cs] = (void __iomem *)resource.start; ret = dev_read_resource(dev, mem_region + 2, &resource); if (ret) { pr_err("Resource addr_base not found for cs%d", chip_cs); return ret; } fmc2->addr_base[chip_cs] = (void __iomem *)resource.start; } /* Enable the clock */ ret = clk_get_by_index(dev, 0, &fmc2->clk); if (ret) return ret; ret = clk_enable(&fmc2->clk); if (ret) return ret; /* Reset */ ret = reset_get_by_index(dev, 0, &reset); if (!ret) { reset_assert(&reset); udelay(2); reset_deassert(&reset); } /* FMC2 init routine */ stm32_fmc2_init(fmc2); chip->controller = &fmc2->base; chip->select_chip = stm32_fmc2_select_chip; chip->setup_data_interface = stm32_fmc2_setup_interface; chip->cmd_ctrl = stm32_fmc2_cmd_ctrl; chip->chip_delay = FMC2_RB_DELAY_US; chip->options |= NAND_BUSWIDTH_AUTO | NAND_NO_SUBPAGE_WRITE | NAND_USE_BOUNCE_BUFFER; /* Default ECC settings */ chip->ecc.mode = NAND_ECC_HW; chip->ecc.size = FMC2_ECC_STEP_SIZE; chip->ecc.strength = FMC2_ECC_BCH8; /* Scan to find existence of the device */ ret = nand_scan_ident(mtd, nand->ncs, NULL); if (ret) return ret; /* * Only NAND_ECC_HW mode is actually supported * Hamming => ecc.strength = 1 * BCH4 => ecc.strength = 4 * BCH8 => ecc.strength = 8 * ECC sector size = 512 */ if (chip->ecc.mode != NAND_ECC_HW) { pr_err("Nand_ecc_mode is not well defined in the DT\n"); return -EINVAL; } ret = nand_check_ecc_caps(chip, &stm32_fmc2_ecc_caps, mtd->oobsize - FMC2_BBM_LEN); if (ret) { pr_err("No valid ECC settings set\n"); return ret; } if (chip->bbt_options & NAND_BBT_USE_FLASH) chip->bbt_options |= NAND_BBT_NO_OOB; /* NAND callbacks setup */ stm32_fmc2_nand_callbacks_setup(chip); /* Define ECC layout */ ecclayout = &fmc2->ecclayout; ecclayout->eccbytes = chip->ecc.bytes * (mtd->writesize / chip->ecc.size); oob_index = FMC2_BBM_LEN; for (i = 0; i < ecclayout->eccbytes; i++, oob_index++) ecclayout->eccpos[i] = oob_index; ecclayout->oobfree->offset = oob_index; ecclayout->oobfree->length = mtd->oobsize - ecclayout->oobfree->offset; chip->ecc.layout = ecclayout; /* Configure bus width to 16-bit */ if (chip->options & NAND_BUSWIDTH_16) stm32_fmc2_set_buswidth_16(fmc2, true); /* Scan the device to fill MTD data-structures */ ret = nand_scan_tail(mtd); if (ret) return ret; return nand_register(0, mtd); } static const struct udevice_id stm32_fmc2_match[] = { { .compatible = "st,stm32mp15-fmc2" }, { /* Sentinel */ } }; U_BOOT_DRIVER(stm32_fmc2_nand) = { .name = "stm32_fmc2_nand", .id = UCLASS_MTD, .of_match = stm32_fmc2_match, .probe = stm32_fmc2_probe, .priv_auto_alloc_size = sizeof(struct stm32_fmc2_nfc), }; void board_nand_init(void) { struct udevice *dev; int ret; ret = uclass_get_device_by_driver(UCLASS_MTD, DM_GET_DRIVER(stm32_fmc2_nand), &dev); if (ret && ret != -ENODEV) pr_err("Failed to initialize STM32 FMC2 NAND controller. (error %d)\n", ret); }