diff --git a/drivers/st/fmc/stm32_fmc2_nand.c b/drivers/st/fmc/stm32_fmc2_nand.c new file mode 100644 index 0000000..b694fff --- /dev/null +++ b/drivers/st/fmc/stm32_fmc2_nand.c @@ -0,0 +1,877 @@ +/* + * Copyright (c) 2019, STMicroelectronics - All Rights Reserved + * + * SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause + */ + +#include +#include +#include +#include + +#include + +#include + +#include +#include +#include +#include +#include +#include +#include +#include + +/* FMC2 Compatibility */ +#define DT_FMC2_COMPAT "st,stm32mp15-fmc2" +#define MAX_CS 2U + +/* FMC2 Controller Registers */ +#define FMC2_BCR1 0x00U +#define FMC2_PCR 0x80U +#define FMC2_SR 0x84U +#define FMC2_PMEM 0x88U +#define FMC2_PATT 0x8CU +#define FMC2_HECCR 0x94U +#define FMC2_BCHISR 0x254U +#define FMC2_BCHDSR0 0x27CU +#define FMC2_BCHDSR1 0x280U +#define FMC2_BCHDSR2 0x284U +#define FMC2_BCHDSR3 0x288U +#define FMC2_BCHDSR4 0x28CU + +/* FMC2_BCR1 register */ +#define FMC2_BCR1_FMC2EN BIT(31) +/* FMC2_PCR register */ +#define FMC2_PCR_PWAITEN BIT(1) +#define FMC2_PCR_PBKEN BIT(2) +#define FMC2_PCR_PWID_MASK GENMASK_32(5, 4) +#define FMC2_PCR_PWID(x) (((x) << 4) & FMC2_PCR_PWID_MASK) +#define FMC2_PCR_PWID_8 0x0U +#define FMC2_PCR_PWID_16 0x1U +#define FMC2_PCR_ECCEN BIT(6) +#define FMC2_PCR_ECCALG BIT(8) +#define FMC2_PCR_TCLR_MASK GENMASK_32(12, 9) +#define FMC2_PCR_TCLR(x) (((x) << 9) & FMC2_PCR_TCLR_MASK) +#define FMC2_PCR_TCLR_DEFAULT 0xFU +#define FMC2_PCR_TAR_MASK GENMASK_32(16, 13) +#define FMC2_PCR_TAR(x) (((x) << 13) & FMC2_PCR_TAR_MASK) +#define FMC2_PCR_TAR_DEFAULT 0xFU +#define FMC2_PCR_ECCSS_MASK GENMASK_32(19, 17) +#define FMC2_PCR_ECCSS(x) (((x) << 17) & FMC2_PCR_ECCSS_MASK) +#define FMC2_PCR_ECCSS_512 0x1U +#define FMC2_PCR_ECCSS_2048 0x3U +#define FMC2_PCR_BCHECC BIT(24) +#define FMC2_PCR_WEN BIT(25) +/* FMC2_SR register */ +#define FMC2_SR_NWRF BIT(6) +/* FMC2_PMEM register*/ +#define FMC2_PMEM_MEMSET(x) (((x) & GENMASK_32(7, 0)) << 0) +#define FMC2_PMEM_MEMWAIT(x) (((x) & GENMASK_32(7, 0)) << 8) +#define FMC2_PMEM_MEMHOLD(x) (((x) & GENMASK_32(7, 0)) << 16) +#define FMC2_PMEM_MEMHIZ(x) (((x) & GENMASK_32(7, 0)) << 24) +#define FMC2_PMEM_DEFAULT 0x0A0A0A0AU +/* FMC2_PATT register */ +#define FMC2_PATT_ATTSET(x) (((x) & GENMASK_32(7, 0)) << 0) +#define FMC2_PATT_ATTWAIT(x) (((x) & GENMASK_32(7, 0)) << 8) +#define FMC2_PATT_ATTHOLD(x) (((x) & GENMASK_32(7, 0)) << 16) +#define FMC2_PATT_ATTHIZ(x) (((x) & GENMASK_32(7, 0)) << 24) +#define FMC2_PATT_DEFAULT 0x0A0A0A0AU +/* FMC2_BCHISR register */ +#define FMC2_BCHISR_DERF BIT(1) +/* FMC2_BCHDSR0 register */ +#define FMC2_BCHDSR0_DUE BIT(0) +#define FMC2_BCHDSR0_DEF BIT(1) +#define FMC2_BCHDSR0_DEN_MASK GENMASK_32(7, 4) +#define FMC2_BCHDSR0_DEN_SHIFT 4U +/* FMC2_BCHDSR1 register */ +#define FMC2_BCHDSR1_EBP1_MASK GENMASK_32(12, 0) +#define FMC2_BCHDSR1_EBP2_MASK GENMASK_32(28, 16) +#define FMC2_BCHDSR1_EBP2_SHIFT 16U +/* FMC2_BCHDSR2 register */ +#define FMC2_BCHDSR2_EBP3_MASK GENMASK_32(12, 0) +#define FMC2_BCHDSR2_EBP4_MASK GENMASK_32(28, 16) +#define FMC2_BCHDSR2_EBP4_SHIFT 16U +/* FMC2_BCHDSR3 register */ +#define FMC2_BCHDSR3_EBP5_MASK GENMASK_32(12, 0) +#define FMC2_BCHDSR3_EBP6_MASK GENMASK_32(28, 16) +#define FMC2_BCHDSR3_EBP6_SHIFT 16U +/* FMC2_BCHDSR4 register */ +#define FMC2_BCHDSR4_EBP7_MASK GENMASK_32(12, 0) +#define FMC2_BCHDSR4_EBP8_MASK GENMASK_32(28, 16) +#define FMC2_BCHDSR4_EBP8_SHIFT 16U + +/* Timings */ +#define FMC2_THIZ 0x01U +#define FMC2_TIO 8000U +#define FMC2_TSYNC 3000U +#define FMC2_PCR_TIMING_MASK GENMASK_32(3, 0) +#define FMC2_PMEM_PATT_TIMING_MASK GENMASK_32(7, 0) + +#define FMC2_BBM_LEN 2U +#define FMC2_MAX_ECC_BYTES 14U +#define TIMEOUT_US_10_MS 10000U +#define FMC2_PSEC_PER_MSEC (1000UL * 1000UL * 1000UL) + +enum stm32_fmc2_ecc { + FMC2_ECC_HAM = 1U, + FMC2_ECC_BCH4 = 4U, + FMC2_ECC_BCH8 = 8U +}; + +struct stm32_fmc2_cs_reg { + uintptr_t data_base; + uintptr_t cmd_base; + uintptr_t addr_base; +}; + +struct stm32_fmc2_nand_timings { + uint8_t tclr; + uint8_t tar; + uint8_t thiz; + uint8_t twait; + uint8_t thold_mem; + uint8_t tset_mem; + uint8_t thold_att; + uint8_t tset_att; +}; + +struct stm32_fmc2_nfc { + uintptr_t reg_base; + struct stm32_fmc2_cs_reg cs[MAX_CS]; + unsigned long clock_id; + unsigned int reset_id; + uint8_t cs_sel; +}; + +static struct stm32_fmc2_nfc stm32_fmc2; + +static uintptr_t fmc2_base(void) +{ + return stm32_fmc2.reg_base; +} + +static void stm32_fmc2_nand_setup_timing(void) +{ + struct stm32_fmc2_nand_timings tims; + unsigned long hclk = stm32mp_clk_get_rate(stm32_fmc2.clock_id); + unsigned long hclkp = FMC2_PSEC_PER_MSEC / (hclk / 1000U); + unsigned long timing, tar, tclr, thiz, twait; + unsigned long tset_mem, tset_att, thold_mem, thold_att; + uint32_t pcr, pmem, patt; + + tar = MAX(hclkp, NAND_TAR_MIN); + timing = div_round_up(tar, hclkp) - 1U; + tims.tar = MIN(timing, (unsigned long)FMC2_PCR_TIMING_MASK); + + tclr = MAX(hclkp, NAND_TCLR_MIN); + timing = div_round_up(tclr, hclkp) - 1U; + tims.tclr = MIN(timing, (unsigned long)FMC2_PCR_TIMING_MASK); + + tims.thiz = FMC2_THIZ; + thiz = (tims.thiz + 1U) * hclkp; + + /* + * tWAIT > tRP + * tWAIT > tWP + * tWAIT > tREA + tIO + */ + twait = MAX(hclkp, NAND_TRP_MIN); + twait = MAX(twait, NAND_TWP_MIN); + twait = MAX(twait, NAND_TREA_MAX + FMC2_TIO); + timing = div_round_up(twait, hclkp); + tims.twait = CLAMP(timing, 1UL, + (unsigned long)FMC2_PMEM_PATT_TIMING_MASK); + + /* + * tSETUP_MEM > tCS - tWAIT + * tSETUP_MEM > tALS - tWAIT + * tSETUP_MEM > tDS - (tWAIT - tHIZ) + */ + tset_mem = hclkp; + if ((twait < NAND_TCS_MIN) && (tset_mem < (NAND_TCS_MIN - twait))) { + tset_mem = NAND_TCS_MIN - twait; + } + if ((twait < NAND_TALS_MIN) && (tset_mem < (NAND_TALS_MIN - twait))) { + tset_mem = NAND_TALS_MIN - twait; + } + if ((twait > thiz) && ((twait - thiz) < NAND_TDS_MIN) && + (tset_mem < (NAND_TDS_MIN - (twait - thiz)))) { + tset_mem = NAND_TDS_MIN - (twait - thiz); + } + timing = div_round_up(tset_mem, hclkp); + tims.tset_mem = CLAMP(timing, 1UL, + (unsigned long)FMC2_PMEM_PATT_TIMING_MASK); + + /* + * tHOLD_MEM > tCH + * tHOLD_MEM > tREH - tSETUP_MEM + * tHOLD_MEM > max(tRC, tWC) - (tSETUP_MEM + tWAIT) + */ + thold_mem = MAX(hclkp, NAND_TCH_MIN); + if ((tset_mem < NAND_TREH_MIN) && + (thold_mem < (NAND_TREH_MIN - tset_mem))) { + thold_mem = NAND_TREH_MIN - tset_mem; + } + if (((tset_mem + twait) < NAND_TRC_MIN) && + (thold_mem < (NAND_TRC_MIN - (tset_mem + twait)))) { + thold_mem = NAND_TRC_MIN - (tset_mem + twait); + } + if (((tset_mem + twait) < NAND_TWC_MIN) && + (thold_mem < (NAND_TWC_MIN - (tset_mem + twait)))) { + thold_mem = NAND_TWC_MIN - (tset_mem + twait); + } + timing = div_round_up(thold_mem, hclkp); + tims.thold_mem = CLAMP(timing, 1UL, + (unsigned long)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 ((twait < NAND_TCS_MIN) && (tset_att < (NAND_TCS_MIN - twait))) { + tset_att = NAND_TCS_MIN - twait; + } + if ((twait < NAND_TCLS_MIN) && (tset_att < (NAND_TCLS_MIN - twait))) { + tset_att = NAND_TCLS_MIN - twait; + } + if ((twait < NAND_TALS_MIN) && (tset_att < (NAND_TALS_MIN - twait))) { + tset_att = NAND_TALS_MIN - twait; + } + if ((thold_mem < NAND_TRHW_MIN) && + (tset_att < (NAND_TRHW_MIN - thold_mem))) { + tset_att = NAND_TRHW_MIN - thold_mem; + } + if ((twait > thiz) && ((twait - thiz) < NAND_TDS_MIN) && + (tset_att < (NAND_TDS_MIN - (twait - thiz)))) { + tset_att = NAND_TDS_MIN - (twait - thiz); + } + timing = div_round_up(tset_att, hclkp); + tims.tset_att = CLAMP(timing, 1UL, + (unsigned long)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(hclkp, NAND_TALH_MIN); + thold_att = MAX(thold_att, NAND_TCH_MIN); + thold_att = MAX(thold_att, NAND_TCLH_MIN); + thold_att = MAX(thold_att, NAND_TCOH_MIN); + thold_att = MAX(thold_att, NAND_TDH_MIN); + if (((NAND_TWB_MAX + FMC2_TIO + FMC2_TSYNC) > tset_mem) && + (thold_att < (NAND_TWB_MAX + FMC2_TIO + FMC2_TSYNC - tset_mem))) { + thold_att = NAND_TWB_MAX + FMC2_TIO + FMC2_TSYNC - tset_mem; + } + if ((tset_mem < NAND_TADL_MIN) && + (thold_att < (NAND_TADL_MIN - tset_mem))) { + thold_att = NAND_TADL_MIN - tset_mem; + } + if ((tset_mem < NAND_TWH_MIN) && + (thold_att < (NAND_TWH_MIN - tset_mem))) { + thold_att = NAND_TWH_MIN - tset_mem; + } + if ((tset_mem < NAND_TWHR_MIN) && + (thold_att < (NAND_TWHR_MIN - tset_mem))) { + thold_att = NAND_TWHR_MIN - tset_mem; + } + if (((tset_att + twait) < NAND_TRC_MIN) && + (thold_att < (NAND_TRC_MIN - (tset_att + twait)))) { + thold_att = NAND_TRC_MIN - (tset_att + twait); + } + if (((tset_att + twait) < NAND_TWC_MIN) && + (thold_att < (NAND_TWC_MIN - (tset_att + twait)))) { + thold_att = NAND_TWC_MIN - (tset_att + twait); + } + timing = div_round_up(thold_att, hclkp); + tims.thold_att = CLAMP(timing, 1UL, + (unsigned long)FMC2_PMEM_PATT_TIMING_MASK); + + VERBOSE("NAND timings: %u - %u - %u - %u - %u - %u - %u - %u\n", + tims.tclr, tims.tar, tims.thiz, tims.twait, + tims.thold_mem, tims.tset_mem, + tims.thold_att, tims.tset_att); + + /* Set tclr/tar timings */ + pcr = mmio_read_32(fmc2_base() + FMC2_PCR); + pcr &= ~FMC2_PCR_TCLR_MASK; + pcr |= FMC2_PCR_TCLR(tims.tclr); + pcr &= ~FMC2_PCR_TAR_MASK; + pcr |= FMC2_PCR_TAR(tims.tar); + + /* Set tset/twait/thold/thiz timings in common bank */ + pmem = FMC2_PMEM_MEMSET(tims.tset_mem); + pmem |= FMC2_PMEM_MEMWAIT(tims.twait); + pmem |= FMC2_PMEM_MEMHOLD(tims.thold_mem); + pmem |= FMC2_PMEM_MEMHIZ(tims.thiz); + + /* Set tset/twait/thold/thiz timings in attribute bank */ + patt = FMC2_PATT_ATTSET(tims.tset_att); + patt |= FMC2_PATT_ATTWAIT(tims.twait); + patt |= FMC2_PATT_ATTHOLD(tims.thold_att); + patt |= FMC2_PATT_ATTHIZ(tims.thiz); + + mmio_write_32(fmc2_base() + FMC2_PCR, pcr); + mmio_write_32(fmc2_base() + FMC2_PMEM, pmem); + mmio_write_32(fmc2_base() + FMC2_PATT, patt); +} + +static void stm32_fmc2_set_buswidth_16(bool set) +{ + mmio_clrsetbits_32(fmc2_base() + FMC2_PCR, FMC2_PCR_PWID_MASK, + (set ? FMC2_PCR_PWID(FMC2_PCR_PWID_16) : 0U)); +} + +static void stm32_fmc2_set_ecc(bool enable) +{ + mmio_clrsetbits_32(fmc2_base() + FMC2_PCR, FMC2_PCR_ECCEN, + (enable ? FMC2_PCR_ECCEN : 0U)); +} + +static int stm32_fmc2_ham_correct(uint8_t *buffer, uint8_t *eccbuffer, + uint8_t *ecc) +{ + uint8_t xor_ecc_ones; + uint16_t xor_ecc_1b, xor_ecc_2b, xor_ecc_3b; + union { + uint32_t val; + uint8_t bytes[4]; + } xor_ecc; + + /* Page size--------ECC_Code Size + * 256---------------22 bits LSB (ECC_CODE & 0x003FFFFF) + * 512---------------24 bits (ECC_CODE & 0x00FFFFFF) + * 1024--------------26 bits (ECC_CODE & 0x03FFFFFF) + * 2048--------------28 bits (ECC_CODE & 0x0FFFFFFF) + * 4096--------------30 bits (ECC_CODE & 0x3FFFFFFF) + * 8192--------------32 bits (ECC_CODE & 0xFFFFFFFF) + */ + + /* For Page size 512, ECC_Code size 24 bits */ + xor_ecc_1b = ecc[0] ^ eccbuffer[0]; + xor_ecc_2b = ecc[1] ^ eccbuffer[1]; + xor_ecc_3b = ecc[2] ^ eccbuffer[2]; + + xor_ecc.val = 0L; + xor_ecc.bytes[2] = xor_ecc_3b; + xor_ecc.bytes[1] = xor_ecc_2b; + xor_ecc.bytes[0] = xor_ecc_1b; + + if (xor_ecc.val == 0U) { + return 0; /* No Error */ + } + + xor_ecc_ones = __builtin_popcount(xor_ecc.val); + if (xor_ecc_ones < 23U) { + if (xor_ecc_ones == 12U) { + uint16_t bit_address, byte_address; + + /* Correctable ERROR */ + bit_address = ((xor_ecc_1b >> 1) & BIT(0)) | + ((xor_ecc_1b >> 2) & BIT(1)) | + ((xor_ecc_1b >> 3) & BIT(2)); + + byte_address = ((xor_ecc_1b >> 7) & BIT(0)) | + ((xor_ecc_2b) & BIT(1)) | + ((xor_ecc_2b >> 1) & BIT(2)) | + ((xor_ecc_2b >> 2) & BIT(3)) | + ((xor_ecc_2b >> 3) & BIT(4)) | + ((xor_ecc_3b << 4) & BIT(5)) | + ((xor_ecc_3b << 3) & BIT(6)) | + ((xor_ecc_3b << 2) & BIT(7)) | + ((xor_ecc_3b << 1) & BIT(8)); + + /* Correct bit error in the data */ + buffer[byte_address] = + buffer[byte_address] ^ BIT(bit_address); + VERBOSE("Hamming: 1 ECC error corrected\n"); + + return 0; + } + + /* Non Correctable ERROR */ + ERROR("%s: Uncorrectable ECC Errors\n", __func__); + return -1; + } + + /* ECC ERROR */ + ERROR("%s: Hamming correction error\n", __func__); + return -1; +} + + +static int stm32_fmc2_ham_calculate(uint8_t *buffer, uint8_t *ecc) +{ + uint32_t heccr; + uint64_t timeout = timeout_init_us(TIMEOUT_US_10_MS); + + while ((mmio_read_32(fmc2_base() + FMC2_SR) & FMC2_SR_NWRF) == 0U) { + if (timeout_elapsed(timeout)) { + return -ETIMEDOUT; + } + } + + heccr = mmio_read_32(fmc2_base() + FMC2_HECCR); + + ecc[0] = heccr; + ecc[1] = heccr >> 8; + ecc[2] = heccr >> 16; + + /* Disable ECC */ + stm32_fmc2_set_ecc(false); + + return 0; +} + +static int stm32_fmc2_bch_correct(uint8_t *buffer, unsigned int eccsize) +{ + uint32_t bchdsr0, bchdsr1, bchdsr2, bchdsr3, bchdsr4; + uint16_t pos[8]; + int i, den; + uint64_t timeout = timeout_init_us(TIMEOUT_US_10_MS); + + while ((mmio_read_32(fmc2_base() + FMC2_BCHISR) & + FMC2_BCHISR_DERF) == 0U) { + if (timeout_elapsed(timeout)) { + return -ETIMEDOUT; + } + } + + bchdsr0 = mmio_read_32(fmc2_base() + FMC2_BCHDSR0); + bchdsr1 = mmio_read_32(fmc2_base() + FMC2_BCHDSR1); + bchdsr2 = mmio_read_32(fmc2_base() + FMC2_BCHDSR2); + bchdsr3 = mmio_read_32(fmc2_base() + FMC2_BCHDSR3); + bchdsr4 = mmio_read_32(fmc2_base() + FMC2_BCHDSR4); + + /* Disable ECC */ + stm32_fmc2_set_ecc(false); + + /* No error found */ + if ((bchdsr0 & FMC2_BCHDSR0_DEF) == 0U) { + return 0; + } + + /* Too many errors detected */ + if ((bchdsr0 & FMC2_BCHDSR0_DUE) != 0U) { + 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 * 8U)) { + uint8_t bitmask = BIT(pos[i] % 8U); + uint32_t offset = pos[i] / 8U; + + *(buffer + offset) ^= bitmask; + } + } + + return 0; +} + +static void stm32_fmc2_hwctl(struct nand_device *nand) +{ + stm32_fmc2_set_ecc(false); + + if (nand->ecc.max_bit_corr != FMC2_ECC_HAM) { + mmio_clrbits_32(fmc2_base() + FMC2_PCR, FMC2_PCR_WEN); + } + + stm32_fmc2_set_ecc(true); +} + +static int stm32_fmc2_read_page(struct nand_device *nand, + unsigned int page, uintptr_t buffer) +{ + unsigned int eccsize = nand->ecc.size; + unsigned int eccbytes = nand->ecc.bytes; + unsigned int eccsteps = nand->page_size / eccsize; + uint8_t ecc_corr[FMC2_MAX_ECC_BYTES]; + uint8_t ecc_cal[FMC2_MAX_ECC_BYTES] = {0U}; + uint8_t *p; + unsigned int i; + unsigned int s; + int ret; + + VERBOSE(">%s page %i buffer %lx\n", __func__, page, buffer); + + ret = nand_read_page_cmd(page, 0U, 0U, 0U); + if (ret != 0) { + return ret; + } + + for (s = 0U, i = nand->page_size + FMC2_BBM_LEN, p = (uint8_t *)buffer; + s < eccsteps; + s++, i += eccbytes, p += eccsize) { + stm32_fmc2_hwctl(nand); + + /* Read the NAND page sector (512 bytes) */ + ret = nand_change_read_column_cmd(s * eccsize, (uintptr_t)p, + eccsize); + if (ret != 0) { + return ret; + } + + if (nand->ecc.max_bit_corr == FMC2_ECC_HAM) { + ret = stm32_fmc2_ham_calculate(p, ecc_cal); + if (ret != 0) { + return ret; + } + } + + /* Read the corresponding ECC bytes */ + ret = nand_change_read_column_cmd(i, (uintptr_t)ecc_corr, + eccbytes); + if (ret != 0) { + return ret; + } + + /* Correct the data */ + if (nand->ecc.max_bit_corr == FMC2_ECC_HAM) { + ret = stm32_fmc2_ham_correct(p, ecc_corr, ecc_cal); + } else { + ret = stm32_fmc2_bch_correct(p, eccsize); + } + + if (ret != 0) { + return ret; + } + } + + return 0; +} + +static void stm32_fmc2_read_data(struct nand_device *nand, + uint8_t *buff, unsigned int length, + bool use_bus8) +{ + uintptr_t data_base = stm32_fmc2.cs[stm32_fmc2.cs_sel].data_base; + + if (use_bus8 && (nand->buswidth == NAND_BUS_WIDTH_16)) { + stm32_fmc2_set_buswidth_16(false); + } + + if ((((uintptr_t)buff & BIT(0)) != 0U) && (length != 0U)) { + *buff = mmio_read_8(data_base); + buff += sizeof(uint8_t); + length -= sizeof(uint8_t); + } + + if ((((uintptr_t)buff & GENMASK_32(1, 0)) != 0U) && + (length >= sizeof(uint16_t))) { + *(uint16_t *)buff = mmio_read_16(data_base); + buff += sizeof(uint16_t); + length -= sizeof(uint16_t); + } + + /* 32bit aligned */ + while (length >= sizeof(uint32_t)) { + *(uint32_t *)buff = mmio_read_32(data_base); + buff += sizeof(uint32_t); + length -= sizeof(uint32_t); + } + + /* Read remaining bytes */ + if (length >= sizeof(uint16_t)) { + *(uint16_t *)buff = mmio_read_16(data_base); + buff += sizeof(uint16_t); + length -= sizeof(uint16_t); + } + + if (length != 0U) { + *buff = mmio_read_8(data_base); + } + + if (use_bus8 && (nand->buswidth == NAND_BUS_WIDTH_16)) { + /* Reconfigure bus width to 16-bit */ + stm32_fmc2_set_buswidth_16(true); + } +} + +static void stm32_fmc2_write_data(struct nand_device *nand, + uint8_t *buff, unsigned int length, + bool use_bus8) +{ + uintptr_t data_base = stm32_fmc2.cs[stm32_fmc2.cs_sel].data_base; + + if (use_bus8 && (nand->buswidth == NAND_BUS_WIDTH_16)) { + /* Reconfigure bus width to 8-bit */ + stm32_fmc2_set_buswidth_16(false); + } + + if ((((uintptr_t)buff & BIT(0)) != 0U) && (length != 0U)) { + mmio_write_8(data_base, *buff); + buff += sizeof(uint8_t); + length -= sizeof(uint8_t); + } + + if ((((uintptr_t)buff & GENMASK_32(1, 0)) != 0U) && + (length >= sizeof(uint16_t))) { + mmio_write_16(data_base, *(uint16_t *)buff); + buff += sizeof(uint16_t); + length -= sizeof(uint16_t); + } + + /* 32bits aligned */ + while (length >= sizeof(uint32_t)) { + mmio_write_32(data_base, *(uint32_t *)buff); + buff += sizeof(uint32_t); + length -= sizeof(uint32_t); + } + + /* Read remaining bytes */ + if (length >= sizeof(uint16_t)) { + mmio_write_16(data_base, *(uint16_t *)buff); + buff += sizeof(uint16_t); + length -= sizeof(uint16_t); + } + + if (length != 0U) { + mmio_write_8(data_base, *buff); + } + + if (use_bus8 && (nand->buswidth == NAND_BUS_WIDTH_16)) { + /* Reconfigure bus width to 16-bit */ + stm32_fmc2_set_buswidth_16(true); + } +} + +static void stm32_fmc2_ctrl_init(void) +{ + uint32_t pcr = mmio_read_32(fmc2_base() + FMC2_PCR); + uint32_t bcr1 = mmio_read_32(fmc2_base() + FMC2_BCR1); + + /* 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; + + mmio_write_32(fmc2_base() + FMC2_BCR1, bcr1); + mmio_write_32(fmc2_base() + FMC2_PCR, pcr); + mmio_write_32(fmc2_base() + FMC2_PMEM, FMC2_PMEM_DEFAULT); + mmio_write_32(fmc2_base() + FMC2_PATT, FMC2_PATT_DEFAULT); +} + +static int stm32_fmc2_exec(struct nand_req *req) +{ + int ret = 0; + + switch (req->type & NAND_REQ_MASK) { + case NAND_REQ_CMD: + VERBOSE("Write CMD %x\n", (uint8_t)req->type); + mmio_write_8(stm32_fmc2.cs[stm32_fmc2.cs_sel].cmd_base, + (uint8_t)req->type); + break; + case NAND_REQ_ADDR: + VERBOSE("Write ADDR %x\n", *(req->addr)); + mmio_write_8(stm32_fmc2.cs[stm32_fmc2.cs_sel].addr_base, + *(req->addr)); + break; + case NAND_REQ_DATAIN: + VERBOSE("Read data\n"); + stm32_fmc2_read_data(req->nand, req->addr, req->length, + ((req->type & NAND_REQ_BUS_WIDTH_8) != + 0U)); + break; + case NAND_REQ_DATAOUT: + VERBOSE("Write data\n"); + stm32_fmc2_write_data(req->nand, req->addr, req->length, + ((req->type & NAND_REQ_BUS_WIDTH_8) != + 0U)); + break; + case NAND_REQ_WAIT: + VERBOSE("WAIT Ready\n"); + ret = nand_wait_ready(req->delay_ms); + break; + default: + ret = -EINVAL; + break; + }; + + return ret; +} + +static void stm32_fmc2_setup(struct nand_device *nand) +{ + uint32_t pcr = mmio_read_32(fmc2_base() + FMC2_PCR); + + /* Set buswidth */ + pcr &= ~FMC2_PCR_PWID_MASK; + if (nand->buswidth == NAND_BUS_WIDTH_16) { + pcr |= FMC2_PCR_PWID(FMC2_PCR_PWID_16); + } + + if (nand->ecc.mode == NAND_ECC_HW) { + nand->mtd_read_page = stm32_fmc2_read_page; + + pcr &= ~FMC2_PCR_ECCALG; + pcr &= ~FMC2_PCR_BCHECC; + + pcr &= ~FMC2_PCR_ECCSS_MASK; + pcr |= FMC2_PCR_ECCSS(FMC2_PCR_ECCSS_512); + + switch (nand->ecc.max_bit_corr) { + case FMC2_ECC_HAM: + nand->ecc.bytes = 3; + break; + case FMC2_ECC_BCH8: + pcr |= FMC2_PCR_ECCALG; + pcr |= FMC2_PCR_BCHECC; + nand->ecc.bytes = 13; + break; + default: + /* Use FMC2 ECC BCH4 */ + pcr |= FMC2_PCR_ECCALG; + nand->ecc.bytes = 7; + break; + } + + if ((nand->buswidth & NAND_BUS_WIDTH_16) != 0) { + nand->ecc.bytes++; + } + } + + mmio_write_32(stm32_fmc2.reg_base + FMC2_PCR, pcr); +} + +static const struct nand_ctrl_ops ctrl_ops = { + .setup = stm32_fmc2_setup, + .exec = stm32_fmc2_exec +}; + +int stm32_fmc2_init(void) +{ + int fmc_node; + int fmc_subnode = 0; + int nchips = 0; + unsigned int i; + void *fdt = NULL; + const fdt32_t *cuint; + struct dt_node_info info; + + if (fdt_get_address(&fdt) == 0) { + return -FDT_ERR_NOTFOUND; + } + + fmc_node = dt_get_node(&info, -1, DT_FMC2_COMPAT); + if (fmc_node == -FDT_ERR_NOTFOUND) { + WARN("No FMC2 node found\n"); + return fmc_node; + } + + if (info.status == DT_DISABLED) { + return -FDT_ERR_NOTFOUND; + } + + stm32_fmc2.reg_base = info.base; + + if ((info.clock < 0) || (info.reset < 0)) { + return -FDT_ERR_BADVALUE; + } + + stm32_fmc2.clock_id = (unsigned long)info.clock; + stm32_fmc2.reset_id = (unsigned int)info.reset; + + cuint = fdt_getprop(fdt, fmc_node, "reg", NULL); + if (cuint == NULL) { + return -FDT_ERR_BADVALUE; + } + + cuint += 2; + + for (i = 0U; i < MAX_CS; i++) { + stm32_fmc2.cs[i].data_base = fdt32_to_cpu(*cuint); + stm32_fmc2.cs[i].cmd_base = fdt32_to_cpu(*(cuint + 2)); + stm32_fmc2.cs[i].addr_base = fdt32_to_cpu(*(cuint + 4)); + cuint += 6; + } + + /* Pinctrl initialization */ + if (dt_set_pinctrl_config(fmc_node) != 0) { + return -FDT_ERR_BADVALUE; + } + + /* Parse flash nodes */ + fdt_for_each_subnode(fmc_subnode, fdt, fmc_node) { + nchips++; + } + + if (nchips != 1) { + WARN("Only one SLC NAND device supported\n"); + return -FDT_ERR_BADVALUE; + } + + fdt_for_each_subnode(fmc_subnode, fdt, fmc_node) { + /* Get chip select */ + cuint = fdt_getprop(fdt, fmc_subnode, "reg", NULL); + if (cuint == NULL) { + WARN("Chip select not well defined\n"); + return -FDT_ERR_BADVALUE; + } + stm32_fmc2.cs_sel = fdt32_to_cpu(*cuint); + VERBOSE("NAND CS %i\n", stm32_fmc2.cs_sel); + } + + /* Enable Clock */ + stm32mp_clk_enable(stm32_fmc2.clock_id); + + /* Reset IP */ + stm32mp_reset_assert(stm32_fmc2.reset_id); + stm32mp_reset_deassert(stm32_fmc2.reset_id); + + /* Setup default IP registers */ + stm32_fmc2_ctrl_init(); + + /* Setup default timings */ + stm32_fmc2_nand_setup_timing(); + + /* Init NAND RAW framework */ + nand_raw_ctrl_init(&ctrl_ops); + + return 0; +} diff --git a/include/drivers/st/stm32_fmc2_nand.h b/include/drivers/st/stm32_fmc2_nand.h new file mode 100644 index 0000000..81d5b9d --- /dev/null +++ b/include/drivers/st/stm32_fmc2_nand.h @@ -0,0 +1,12 @@ +/* + * Copyright (c) 2019, STMicroelectronics - All Rights Reserved + * + * SPDX-License-Identifier: GPL-2.0+ OR BSD-3-Clause + */ + +#ifndef STM32_FMC2_NAND_H +#define STM32_FMC2_NAND_H + +int stm32_fmc2_init(void); + +#endif /* STM32_FMC2_NAND_H */