drivers/mtd/nand/spr_nand.c

   1 /*
   2  * (C) Copyright 2009
   3  * Vipin Kumar, ST Micoelectronics, vipin.kumar@st.com.
   4  *
   5  * See file CREDITS for list of people who contributed to this
   6  * project.
   7  *
   8  * This program is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU General Public License as
  10  * published by the Free Software Foundation; either version 2 of
  11  * the License, or (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston,
  21  * MA 02111-1307 USA
  22  */
  23
  24 #include <common.h>
  25 #include <nand.h>
  26 #include <linux/mtd/nand_ecc.h>
  27 #include <asm/io.h>
  28 #include <asm/arch/hardware.h>
  29 #include <asm/arch/spr_nand.h>
  30
  31 static struct fsmc_regs *const fsmc_regs_p =
  32     (struct fsmc_regs *)CONFIG_SPEAR_FSMCBASE;
  33
  34 static struct nand_ecclayout spear_nand_ecclayout = {
  35         .eccbytes = 24,
  36         .eccpos = {2, 3, 4, 18, 19, 20, 34, 35, 36, 50, 51, 52,
  37                    66, 67, 68, 82, 83, 84, 98, 99, 100, 114, 115, 116},
  38         .oobfree = {
  39                     {.offset = 8, .length = 8},
  40                     {.offset = 24, .length = 8},
  41                     {.offset = 40, .length = 8},
  42                     {.offset = 56, .length = 8},
  43                     {.offset = 72, .length = 8},
  44                     {.offset = 88, .length = 8},
  45                     {.offset = 104, .length = 8},
  46                     {.offset = 120, .length = 8}
  47                     }
  48 };
  49
  50 static void spear_nand_hwcontrol(struct mtd_info *mtd, int cmd, uint ctrl)
  51 {
  52         struct nand_chip *this = mtd->priv;
  53         ulong IO_ADDR_W;
  54
  55         if (ctrl & NAND_CTRL_CHANGE) {
  56                 IO_ADDR_W = (ulong)this->IO_ADDR_W;
  57
  58                 IO_ADDR_W &= ~(CONFIG_SYS_NAND_CLE | CONFIG_SYS_NAND_ALE);
  59                 if (ctrl & NAND_CLE)
  60                         IO_ADDR_W |= CONFIG_SYS_NAND_CLE;
  61                 if (ctrl & NAND_ALE)
  62                         IO_ADDR_W |= CONFIG_SYS_NAND_ALE;
  63
  64                 if (ctrl & NAND_NCE) {
  65                         writel(readl(&fsmc_regs_p->genmemctrl_pc) |
  66                                FSMC_ENABLE, &fsmc_regs_p->genmemctrl_pc);
  67                 } else {
  68                         writel(readl(&fsmc_regs_p->genmemctrl_pc) &
  69                                ~FSMC_ENABLE, &fsmc_regs_p->genmemctrl_pc);
  70                 }
  71                 this->IO_ADDR_W = (void *)IO_ADDR_W;
  72         }
  73
  74         if (cmd != NAND_CMD_NONE)
  75                 writeb(cmd, this->IO_ADDR_W);
  76 }
  77
  78 static int spear_read_hwecc(struct mtd_info *mtd,
  79                             const u_char *data, u_char ecc[3])
  80 {
  81         u_int ecc_tmp;
  82
  83         /* read the h/w ECC */
  84         ecc_tmp = readl(&fsmc_regs_p->genmemctrl_ecc);
  85
  86         ecc[0] = (u_char) (ecc_tmp & 0xFF);
  87         ecc[1] = (u_char) ((ecc_tmp & 0xFF00) >> 8);
  88         ecc[2] = (u_char) ((ecc_tmp & 0xFF0000) >> 16);
  89
  90         return 0;
  91 }
  92
  93 void spear_enable_hwecc(struct mtd_info *mtd, int mode)
  94 {
  95         writel(readl(&fsmc_regs_p->genmemctrl_pc) & ~0x80,
  96                &fsmc_regs_p->genmemctrl_pc);
  97         writel(readl(&fsmc_regs_p->genmemctrl_pc) & ~FSMC_ECCEN,
  98                &fsmc_regs_p->genmemctrl_pc);
  99         writel(readl(&fsmc_regs_p->genmemctrl_pc) | FSMC_ECCEN,
 100                &fsmc_regs_p->genmemctrl_pc);
 101 }
 102
 103 int spear_nand_init(struct nand_chip *nand)
 104 {
 105         writel(FSMC_DEVWID_8 | FSMC_DEVTYPE_NAND | FSMC_ENABLE | FSMC_WAITON,
 106                &fsmc_regs_p->genmemctrl_pc);
 107         writel(readl(&fsmc_regs_p->genmemctrl_pc) | FSMC_TCLR_1 | FSMC_TAR_1,
 108                &fsmc_regs_p->genmemctrl_pc);
 109         writel(FSMC_THIZ_1 | FSMC_THOLD_4 | FSMC_TWAIT_6 | FSMC_TSET_0,
 110                &fsmc_regs_p->genmemctrl_comm);
 111         writel(FSMC_THIZ_1 | FSMC_THOLD_4 | FSMC_TWAIT_6 | FSMC_TSET_0,
 112                &fsmc_regs_p->genmemctrl_attrib);
 113
 114         nand->options = 0;
 115         nand->ecc.mode = NAND_ECC_HW;
 116         nand->ecc.layout = &spear_nand_ecclayout;
 117         nand->ecc.size = 512;
 118         nand->ecc.bytes = 3;
 119         nand->ecc.calculate = spear_read_hwecc;
 120         nand->ecc.hwctl = spear_enable_hwecc;
 121         nand->ecc.correct = nand_correct_data;
 122         nand->cmd_ctrl = spear_nand_hwcontrol;
 123         return 0;
 124 }