diff options
Diffstat (limited to 'drivers/mtd/nand/spr_nand.c')
| -rwxr-xr-x | drivers/mtd/nand/spr_nand.c | 124 |
1 files changed, 124 insertions, 0 deletions
diff --git a/drivers/mtd/nand/spr_nand.c b/drivers/mtd/nand/spr_nand.c new file mode 100755 index 0000000000..097d0c60bf --- /dev/null +++ b/drivers/mtd/nand/spr_nand.c @@ -0,0 +1,124 @@ +/* + * (C) Copyright 2009 + * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com. + * + * See file CREDITS for list of people who contributed to this + * project. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License as + * published by the Free Software Foundation; either version 2 of + * the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, + * MA 02111-1307 USA + */ + +#include <common.h> +#include <nand.h> +#include <linux/mtd/nand_ecc.h> +#include <asm/io.h> +#include <asm/arch/hardware.h> +#include <asm/arch/spr_nand.h> + +static struct fsmc_regs *const fsmc_regs_p = + (struct fsmc_regs *)CONFIG_SPEAR_FSMCBASE; + +static struct nand_ecclayout spear_nand_ecclayout = { + .eccbytes = 24, + .eccpos = {2, 3, 4, 18, 19, 20, 34, 35, 36, 50, 51, 52, + 66, 67, 68, 82, 83, 84, 98, 99, 100, 114, 115, 116}, + .oobfree = { + {.offset = 8, .length = 8}, + {.offset = 24, .length = 8}, + {.offset = 40, .length = 8}, + {.offset = 56, .length = 8}, + {.offset = 72, .length = 8}, + {.offset = 88, .length = 8}, + {.offset = 104, .length = 8}, + {.offset = 120, .length = 8} + } +}; + +static void spear_nand_hwcontrol(struct mtd_info *mtd, int cmd, uint ctrl) +{ + struct nand_chip *this = mtd->priv; + ulong IO_ADDR_W; + + if (ctrl & NAND_CTRL_CHANGE) { + IO_ADDR_W = (ulong)this->IO_ADDR_W; + + IO_ADDR_W &= ~(CONFIG_SYS_NAND_CLE | CONFIG_SYS_NAND_ALE); + if (ctrl & NAND_CLE) + IO_ADDR_W |= CONFIG_SYS_NAND_CLE; + if (ctrl & NAND_ALE) + IO_ADDR_W |= CONFIG_SYS_NAND_ALE; + + if (ctrl & NAND_NCE) { + writel(readl(&fsmc_regs_p->genmemctrl_pc) | + FSMC_ENABLE, &fsmc_regs_p->genmemctrl_pc); + } else { + writel(readl(&fsmc_regs_p->genmemctrl_pc) & + ~FSMC_ENABLE, &fsmc_regs_p->genmemctrl_pc); + } + this->IO_ADDR_W = (void *)IO_ADDR_W; + } + + if (cmd != NAND_CMD_NONE) + writeb(cmd, this->IO_ADDR_W); +} + +static int spear_read_hwecc(struct mtd_info *mtd, + const u_char *data, u_char ecc[3]) +{ + u_int ecc_tmp; + + /* read the h/w ECC */ + ecc_tmp = readl(&fsmc_regs_p->genmemctrl_ecc); + + ecc[0] = (u_char) (ecc_tmp & 0xFF); + ecc[1] = (u_char) ((ecc_tmp & 0xFF00) >> 8); + ecc[2] = (u_char) ((ecc_tmp & 0xFF0000) >> 16); + + return 0; +} + +void spear_enable_hwecc(struct mtd_info *mtd, int mode) +{ + writel(readl(&fsmc_regs_p->genmemctrl_pc) & ~0x80, + &fsmc_regs_p->genmemctrl_pc); + writel(readl(&fsmc_regs_p->genmemctrl_pc) & ~FSMC_ECCEN, + &fsmc_regs_p->genmemctrl_pc); + writel(readl(&fsmc_regs_p->genmemctrl_pc) | FSMC_ECCEN, + &fsmc_regs_p->genmemctrl_pc); +} + +int spear_nand_init(struct nand_chip *nand) +{ + writel(FSMC_DEVWID_8 | FSMC_DEVTYPE_NAND | FSMC_ENABLE | FSMC_WAITON, + &fsmc_regs_p->genmemctrl_pc); + writel(readl(&fsmc_regs_p->genmemctrl_pc) | FSMC_TCLR_1 | FSMC_TAR_1, + &fsmc_regs_p->genmemctrl_pc); + writel(FSMC_THIZ_1 | FSMC_THOLD_4 | FSMC_TWAIT_6 | FSMC_TSET_0, + &fsmc_regs_p->genmemctrl_comm); + writel(FSMC_THIZ_1 | FSMC_THOLD_4 | FSMC_TWAIT_6 | FSMC_TSET_0, + &fsmc_regs_p->genmemctrl_attrib); + + nand->options = 0; + nand->ecc.mode = NAND_ECC_HW; + nand->ecc.layout = &spear_nand_ecclayout; + nand->ecc.size = 512; + nand->ecc.bytes = 3; + nand->ecc.calculate = spear_read_hwecc; + nand->ecc.hwctl = spear_enable_hwecc; + nand->ecc.correct = nand_correct_data; + nand->cmd_ctrl = spear_nand_hwcontrol; + return 0; +} |
