drivers/mtd/nand/kirkwood_nand.c

   1 /*
   2  * (C) Copyright 2009
   3  * Marvell Semiconductor <www.marvell.com>
   4  * Written-by: Prafulla Wadaskar <prafulla@marvell.com>
   5  *
   6  * SPDX-License-Identifier:     GPL-2.0+
   7  */
   8
   9 #include <common.h>
  10 #include <asm/io.h>
  11 #include <asm/arch/kirkwood.h>
  12 #include <nand.h>
  13
  14 /* NAND Flash Soc registers */
  15 struct kwnandf_registers {
  16         u32 rd_params;  /* 0x10418 */
  17         u32 wr_param;   /* 0x1041c */
  18         u8  pad[0x10470 - 0x1041c - 4];
  19         u32 ctrl;       /* 0x10470 */
  20 };
  21
  22 static struct kwnandf_registers *nf_reg =
  23         (struct kwnandf_registers *)KW_NANDF_BASE;
  24
  25 /*
  26  * hardware specific access to control-lines/bits
  27  */
  28 #define NAND_ACTCEBOOT_BIT              0x02
  29
  30 static void kw_nand_hwcontrol(struct mtd_info *mtd, int cmd,
  31                               unsigned int ctrl)
  32 {
  33         struct nand_chip *nc = mtd->priv;
  34         u32 offs;
  35
  36         if (cmd == NAND_CMD_NONE)
  37                 return;
  38
  39         if (ctrl & NAND_CLE)
  40                 offs = (1 << 0);        /* Commands with A[1:0] == 01 */
  41         else if (ctrl & NAND_ALE)
  42                 offs = (1 << 1);        /* Addresses with A[1:0] == 10 */
  43         else
  44                 return;
  45
  46         writeb(cmd, nc->IO_ADDR_W + offs);
  47 }
  48
  49 void kw_nand_select_chip(struct mtd_info *mtd, int chip)
  50 {
  51         u32 data;
  52
  53         data = readl(&nf_reg->ctrl);
  54         data |= NAND_ACTCEBOOT_BIT;
  55         writel(data, &nf_reg->ctrl);
  56 }
  57
  58 int board_nand_init(struct nand_chip *nand)
  59 {
  60         nand->options = NAND_COPYBACK | NAND_CACHEPRG | NAND_NO_PADDING;
  61 #if defined(CONFIG_NAND_ECC_BCH)
  62         nand->ecc.mode = NAND_ECC_SOFT_BCH;
  63 #else
  64         nand->ecc.mode = NAND_ECC_SOFT;
  65 #endif
  66         nand->cmd_ctrl = kw_nand_hwcontrol;
  67         nand->chip_delay = 40;
  68         nand->select_chip = kw_nand_select_chip;
  69         return 0;
  70 }