diff options
Diffstat (limited to 'drivers/mtd/nand')
| -rw-r--r-- | drivers/mtd/nand/Makefile | 1 | ||||
| -rw-r--r-- | drivers/mtd/nand/nomadik.c | 206 |
2 files changed, 0 insertions, 207 deletions
diff --git a/drivers/mtd/nand/Makefile b/drivers/mtd/nand/Makefile index 71c1a519e9..b4e5376176 100644 --- a/drivers/mtd/nand/Makefile +++ b/drivers/mtd/nand/Makefile @@ -60,7 +60,6 @@ obj-$(CONFIG_NAND_VF610_NFC) += vf610_nfc.o obj-$(CONFIG_NAND_MXC) += mxc_nand.o obj-$(CONFIG_NAND_MXS) += mxs_nand.o obj-$(CONFIG_NAND_NDFC) += ndfc.o -obj-$(CONFIG_NAND_NOMADIK) += nomadik.o obj-$(CONFIG_NAND_PXA3XX) += pxa3xx_nand.o obj-$(CONFIG_NAND_S3C2410) += s3c2410_nand.o obj-$(CONFIG_NAND_SPEAR) += spr_nand.o diff --git a/drivers/mtd/nand/nomadik.c b/drivers/mtd/nand/nomadik.c deleted file mode 100644 index a7cee5138d..0000000000 --- a/drivers/mtd/nand/nomadik.c +++ /dev/null @@ -1,206 +0,0 @@ -/* - * (C) Copyright 2007 STMicroelectronics, <www.st.com> - * (C) Copyright 2009 Alessandro Rubini <rubini@unipv.it> - * - * SPDX-License-Identifier: GPL-2.0+ - */ - -#include <common.h> -#include <nand.h> -#include <asm/io.h> - -static inline int parity(int b) /* b is really a byte; returns 0 or ~0 */ -{ - __asm__ __volatile__( - "eor %0, %0, %0, lsr #4\n\t" - "eor %0, %0, %0, lsr #2\n\t" - "eor %0, %0, %0, lsr #1\n\t" - "ands %0, %0, #1\n\t" - "subne %0, %0, #2\t" - : "=r" (b) : "0" (b)); - return b; -} - -/* - * This is the ECC routine used in hardware, according to the manual. - * HW claims to make the calculation but not the correction; so we must - * recalculate the bytes for a comparison. - */ -static int ecc512(const unsigned char *data, unsigned char *ecc) -{ - int gpar = 0; - int i, val, par; - int pbits = 0; /* P8, P16, ... P2048 */ - int pprime = 0; /* P8', P16', ... P2048' */ - int lowbits; /* P1, P2, P4 and primes */ - - for (i = 0; i < 512; i++) { - par = parity((val = data[i])); - gpar ^= val; - pbits ^= (i & par); - } - /* - * Ok, now gpar is global parity (xor of all bytes) - * pbits are all the parity bits (non-prime ones) - */ - par = parity(gpar); - pprime = pbits ^ par; - /* Put low bits in the right position for ecc[2] (bits 7..2) */ - lowbits = 0 - | (parity(gpar & 0xf0) & 0x80) /* P4 */ - | (parity(gpar & 0x0f) & 0x40) /* P4' */ - | (parity(gpar & 0xcc) & 0x20) /* P2 */ - | (parity(gpar & 0x33) & 0x10) /* P2' */ - | (parity(gpar & 0xaa) & 0x08) /* P1 */ - | (parity(gpar & 0x55) & 0x04); /* P1' */ - - ecc[2] = ~(lowbits | ((pbits & 0x100) >> 7) | ((pprime & 0x100) >> 8)); - /* now intermix bits for ecc[1] (P1024..P128') and ecc[0] (P64..P8') */ - ecc[1] = ~( (pbits & 0x80) >> 0 | ((pprime & 0x80) >> 1) - | ((pbits & 0x40) >> 1) | ((pprime & 0x40) >> 2) - | ((pbits & 0x20) >> 2) | ((pprime & 0x20) >> 3) - | ((pbits & 0x10) >> 3) | ((pprime & 0x10) >> 4)); - - ecc[0] = ~( (pbits & 0x8) << 4 | ((pprime & 0x8) << 3) - | ((pbits & 0x4) << 3) | ((pprime & 0x4) << 2) - | ((pbits & 0x2) << 2) | ((pprime & 0x2) << 1) - | ((pbits & 0x1) << 1) | ((pprime & 0x1) << 0)); - return 0; -} - -/* This is the method in the chip->ecc field */ -static int nomadik_ecc_calculate(struct mtd_info *mtd, const uint8_t *dat, - uint8_t *ecc_code) -{ - return ecc512(dat, ecc_code); -} - -static int nomadik_ecc_correct(struct mtd_info *mtd, uint8_t *dat, - uint8_t *r_ecc, uint8_t *c_ecc) -{ - struct nand_chip *chip = mtd->priv; - uint32_t r, c, d, diff; /*read, calculated, xor of them */ - - if (!memcmp(r_ecc, c_ecc, chip->ecc.bytes)) - return 0; - - /* Reorder the bytes into ascending-order 24 bits -- see manual */ - r = r_ecc[2] << 22 | r_ecc[1] << 14 | r_ecc[0] << 6 | r_ecc[2] >> 2; - c = c_ecc[2] << 22 | c_ecc[1] << 14 | c_ecc[0] << 6 | c_ecc[2] >> 2; - diff = (r ^ c) & ((1<<24)-1); /* use 24 bits only */ - - /* If 12 bits are different, one per pair, it's correctable */ - if (((diff | (diff>>1)) & 0x555555) == 0x555555) { - int bit = ((diff & 2) >> 1) - | ((diff & 0x8) >> 2) | ((diff & 0x20) >> 3); - int byte; - - d = diff >> 6; /* remove bit-order info */ - byte = ((d & 2) >> 1) - | ((d & 0x8) >> 2) | ((d & 0x20) >> 3) - | ((d & 0x80) >> 4) | ((d & 0x200) >> 5) - | ((d & 0x800) >> 6) | ((d & 0x2000) >> 7) - | ((d & 0x8000) >> 8) | ((d & 0x20000) >> 9); - /* correct the single bit */ - dat[byte] ^= 1<<bit; - return 0; - } - /* If 1 bit only differs, it's one bit error in ECC, ignore */ - if ((diff ^ (1 << (ffs(diff) - 1))) == 0) - return 0; - /* Otherwise, uncorrectable */ - return -1; -} - -static void nomadik_ecc_hwctl(struct mtd_info *mtd, int mode) -{ /* mandatory in the structure but not used here */ } - - -/* This is the layout used by older installations, we keep compatible */ -struct nand_ecclayout nomadik_ecc_layout = { - .eccbytes = 3 * 4, - .eccpos = { /* each subpage has 16 bytes: pos 2,3,4 hosts ECC */ - 0x02, 0x03, 0x04, - 0x12, 0x13, 0x14, - 0x22, 0x23, 0x24, - 0x32, 0x33, 0x34}, - .oobfree = { {0x08, 0x08}, {0x18, 0x08}, {0x28, 0x08}, {0x38, 0x08} }, -}; - -#define MASK_ALE (1 << 24) /* our ALE is AD21 */ -#define MASK_CLE (1 << 23) /* our CLE is AD22 */ - -/* This is copied from the AT91SAM9 devices (Stelian Pop, Lead Tech Design) */ -static void nomadik_nand_hwcontrol(struct mtd_info *mtd, - int cmd, unsigned int ctrl) -{ - struct nand_chip *this = mtd->priv; - u32 pcr0 = readl(REG_FSMC_PCR0); - - if (ctrl & NAND_CTRL_CHANGE) { - ulong IO_ADDR_W = (ulong) this->IO_ADDR_W; - IO_ADDR_W &= ~(MASK_ALE | MASK_CLE); - - if (ctrl & NAND_CLE) - IO_ADDR_W |= MASK_CLE; - if (ctrl & NAND_ALE) - IO_ADDR_W |= MASK_ALE; - - if (ctrl & NAND_NCE) - writel(pcr0 | 0x4, REG_FSMC_PCR0); - else - writel(pcr0 & ~0x4, REG_FSMC_PCR0); - - this->IO_ADDR_W = (void *) IO_ADDR_W; - this->IO_ADDR_R = (void *) IO_ADDR_W; - } - - if (cmd != NAND_CMD_NONE) - writeb(cmd, this->IO_ADDR_W); -} - -/* Returns 1 when ready; upper layers timeout at 20ms with timer routines */ -static int nomadik_nand_ready(struct mtd_info *mtd) -{ - return 1; /* The ready bit is handled in hardware */ -} - -/* Copy a buffer 32bits at a time: faster than defualt method which is 8bit */ -static void nomadik_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len) -{ - int i; - struct nand_chip *chip = mtd->priv; - u32 *p = (u32 *) buf; - - len >>= 2; - writel(0, REG_FSMC_ECCR0); - for (i = 0; i < len; i++) - p[i] = readl(chip->IO_ADDR_R); -} - -int board_nand_init(struct nand_chip *chip) -{ - /* Set up the FSMC_PCR0 for nand access*/ - writel(0x0000004a, REG_FSMC_PCR0); - /* Set up FSMC_PMEM0, FSMC_PATT0 with timing data for access */ - writel(0x00020401, REG_FSMC_PMEM0); - writel(0x00020404, REG_FSMC_PATT0); - - chip->options = NAND_COPYBACK | NAND_CACHEPRG | NAND_NO_PADDING; - chip->cmd_ctrl = nomadik_nand_hwcontrol; - chip->dev_ready = nomadik_nand_ready; - /* The chip allows 32bit reads, so avoid the default 8bit copy */ - chip->read_buf = nomadik_nand_read_buf; - - /* ECC: follow the hardware-defined rulse, but do it in sw */ - chip->ecc.mode = NAND_ECC_HW; - chip->ecc.bytes = 3; - chip->ecc.size = 512; - chip->ecc.strength = 1; - chip->ecc.layout = &nomadik_ecc_layout; - chip->ecc.calculate = nomadik_ecc_calculate; - chip->ecc.hwctl = nomadik_ecc_hwctl; - chip->ecc.correct = nomadik_ecc_correct; - - return 0; -} |
