target/linux/lantiq/files-3.3/arch/mips/lantiq/xway/nand.c

   1 /*
   2  *  This program is free software; you can redistribute it and/or modify it
   3  *  under the terms of the GNU General Public License version 2 as published
   4  *  by the Free Software Foundation.
   5  *
   6  *  Copyright (C) 2010 John Crispin <blogic@openwrt.org>
   7  */
   8
   9 #include <linux/mtd/physmap.h>
  10 #include <linux/mtd/nand.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/io.h>
  13
  14 #include <lantiq_soc.h>
  15 #include <lantiq_irq.h>
  16 #include <lantiq_platform.h>
  17
  18 #include "devices.h"
  19
  20 /* nand registers */
  21 #define LTQ_EBU_NAND_WAIT       0xB4
  22 #define LTQ_EBU_NAND_ECC0       0xB8
  23 #define LTQ_EBU_NAND_ECC_AC     0xBC
  24 #define LTQ_EBU_NAND_CON        0xB0
  25 #define LTQ_EBU_ADDSEL1         0x24
  26
  27 /* gpio definitions */
  28 #define PIN_ALE                 13
  29 #define PIN_CLE                 24
  30 #define PIN_CS1                 23
  31 #define PIN_RDY                 48  /* NFLASH_READY */
  32 #define PIN_RD                  49  /* NFLASH_READ_N */
  33
  34 #define NAND_CMD_ALE            (1 << 2)
  35 #define NAND_CMD_CLE            (1 << 3)
  36 #define NAND_CMD_CS             (1 << 4)
  37 #define NAND_WRITE_CMD_RESET    0xff
  38 #define NAND_WRITE_CMD          (NAND_CMD_CS | NAND_CMD_CLE)
  39 #define NAND_WRITE_ADDR         (NAND_CMD_CS | NAND_CMD_ALE)
  40 #define NAND_WRITE_DATA         (NAND_CMD_CS)
  41 #define NAND_READ_DATA          (NAND_CMD_CS)
  42 #define NAND_WAIT_WR_C          (1 << 3)
  43 #define NAND_WAIT_RD            (0x1)
  44
  45 #define ADDSEL1_MASK(x)         (x << 4)
  46 #define ADDSEL1_REGEN           1
  47 #define BUSCON1_SETUP           (1 << 22)
  48 #define BUSCON1_BCGEN_RES       (0x3 << 12)
  49 #define BUSCON1_WAITWRC2        (2 << 8)
  50 #define BUSCON1_WAITRDC2        (2 << 6)
  51 #define BUSCON1_HOLDC1          (1 << 4)
  52 #define BUSCON1_RECOVC1         (1 << 2)
  53 #define BUSCON1_CMULT4          1
  54 #define NAND_CON_NANDM          1
  55 #define NAND_CON_CSMUX          (1 << 1)
  56 #define NAND_CON_CS_P           (1 << 4)
  57 #define NAND_CON_SE_P           (1 << 5)
  58 #define NAND_CON_WP_P           (1 << 6)
  59 #define NAND_CON_PRE_P          (1 << 7)
  60 #define NAND_CON_IN_CS0         0
  61 #define NAND_CON_OUT_CS0        0
  62 #define NAND_CON_IN_CS1         (1 << 8)
  63 #define NAND_CON_OUT_CS1        (1 << 10)
  64 #define NAND_CON_CE             (1 << 20)
  65
  66 #define NAND_BASE_ADDRESS       (KSEG1 | 0x14000000)
  67
  68 static const char *part_probes[] = { "cmdlinepart", NULL };
  69
  70 static void xway_select_chip(struct mtd_info *mtd, int chip)
  71 {
  72         switch (chip) {
  73         case -1:
  74                 ltq_ebu_w32_mask(NAND_CON_CE, 0, LTQ_EBU_NAND_CON);
  75                 ltq_ebu_w32_mask(NAND_CON_NANDM, 0, LTQ_EBU_NAND_CON);
  76                 break;
  77         case 0:
  78                 ltq_ebu_w32_mask(0, NAND_CON_NANDM, LTQ_EBU_NAND_CON);
  79                 ltq_ebu_w32_mask(0, NAND_CON_CE, LTQ_EBU_NAND_CON);
  80                 /* reset the nand chip */
  81                 while ((ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0)
  82                         ;
  83                 ltq_w32(NAND_WRITE_CMD_RESET,
  84                         ((u32 *) (NAND_BASE_ADDRESS | NAND_WRITE_CMD)));
  85                 break;
  86         default:
  87                 BUG();
  88         }
  89 }
  90
  91 static void xway_cmd_ctrl(struct mtd_info *mtd, int data, unsigned int ctrl)
  92 {
  93         struct nand_chip *this = mtd->priv;
  94
  95         if (ctrl & NAND_CTRL_CHANGE) {
  96                 if (ctrl & NAND_CLE)
  97                         this->IO_ADDR_W = (void __iomem *)
  98                                         (NAND_BASE_ADDRESS | NAND_WRITE_CMD);
  99                 else if (ctrl & NAND_ALE)
 100                         this->IO_ADDR_W = (void __iomem *)
 101                                         (NAND_BASE_ADDRESS | NAND_WRITE_ADDR);
 102         }
 103
 104         if (data != NAND_CMD_NONE) {
 105                 *(volatile u8*) ((u32) this->IO_ADDR_W) = data;
 106                 while ((ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0)
 107                         ;
 108         }
 109 }
 110
 111 static int xway_dev_ready(struct mtd_info *mtd)
 112 {
 113         return ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_RD;
 114 }
 115
 116 void nand_write(unsigned int addr, unsigned int val)
 117 {
 118         ltq_w32(val, ((u32 *) (NAND_BASE_ADDRESS | addr)));
 119         while ((ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0)
 120                 ;
 121 }
 122
 123 unsigned char xway_read_byte(struct mtd_info *mtd)
 124 {
 125         return ltq_r8((void __iomem *)(NAND_BASE_ADDRESS | (NAND_READ_DATA)));
 126 }
 127
 128 static void xway_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
 129 {
 130         int i;
 131
 132         for (i = 0; i < len; i++)
 133         {
 134                 unsigned char res8 =  ltq_r8((void __iomem *)(NAND_BASE_ADDRESS | (NAND_READ_DATA)));
 135                 buf[i] = res8;
 136         }
 137 }
 138
 139 static void xway_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
 140 {
 141         int i;
 142
 143         for (i = 0; i < len; i++)
 144         {
 145                 ltq_w8(buf[i], ((u32*)(NAND_BASE_ADDRESS | (NAND_WRITE_DATA))));
 146                 while((ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0);
 147         }
 148 }
 149
 150 int xway_probe(struct platform_device *pdev)
 151 {
 152         /* might need this later ?
 153         ltq_gpio_request(PIN_CS1, 2, 1, "NAND_CS1");
 154         */
 155         ltq_gpio_request(&pdev->dev, PIN_CLE, 2, 1, "NAND_CLE");
 156         ltq_gpio_request(&pdev->dev, PIN_ALE, 2, 1, "NAND_ALE");
 157         if (ltq_is_ar9() || ltq_is_vr9()) {
 158                 ltq_gpio_request(&pdev->dev, PIN_RDY, 2, 0, "NAND_BSY");
 159                 ltq_gpio_request(&pdev->dev, PIN_RD, 2, 1, "NAND_RD");
 160         }
 161
 162         ltq_ebu_w32((NAND_BASE_ADDRESS & 0x1fffff00)
 163                 | ADDSEL1_MASK(3) | ADDSEL1_REGEN, LTQ_EBU_ADDSEL1);
 164
 165         ltq_ebu_w32(BUSCON1_SETUP | BUSCON1_BCGEN_RES | BUSCON1_WAITWRC2
 166                 | BUSCON1_WAITRDC2 | BUSCON1_HOLDC1 | BUSCON1_RECOVC1
 167                 | BUSCON1_CMULT4, LTQ_EBU_BUSCON1);
 168
 169         ltq_ebu_w32(NAND_CON_NANDM | NAND_CON_CSMUX | NAND_CON_CS_P
 170                 | NAND_CON_SE_P | NAND_CON_WP_P | NAND_CON_PRE_P
 171                 | NAND_CON_IN_CS0 | NAND_CON_OUT_CS0, LTQ_EBU_NAND_CON);
 172
 173         ltq_w32(NAND_WRITE_CMD_RESET,
 174                 ((u32 *) (NAND_BASE_ADDRESS | NAND_WRITE_CMD)));
 175         while ((ltq_ebu_r32(LTQ_EBU_NAND_WAIT) & NAND_WAIT_WR_C) == 0)
 176                 ;
 177
 178         return 0;
 179 }
 180
 181 static struct platform_nand_data falcon_flash_nand_data = {
 182         .chip = {
 183                 .nr_chips               = 1,
 184                 .chip_delay             = 30,
 185                 .part_probe_types       = part_probes,
 186         },
 187         .ctrl = {
 188                 .probe          = xway_probe,
 189                 .cmd_ctrl       = xway_cmd_ctrl,
 190                 .dev_ready      = xway_dev_ready,
 191                 .select_chip    = xway_select_chip,
 192                 .read_byte      = xway_read_byte,
 193                 .read_buf       = xway_read_buf,
 194                 .write_buf      = xway_write_buf,
 195         }
 196 };
 197
 198 static struct resource ltq_nand_res =
 199         MEM_RES("nand", 0x14000000, 0x7ffffff);
 200
 201 static struct platform_device ltq_flash_nand = {
 202         .name           = "gen_nand",
 203         .id             = -1,
 204         .num_resources  = 1,
 205         .resource       = &ltq_nand_res,
 206         .dev            = {
 207                 .platform_data = &falcon_flash_nand_data,
 208         },
 209 };
 210
 211 void __init xway_register_nand(struct mtd_partition *parts, int count)
 212 {
 213         falcon_flash_nand_data.chip.partitions = parts;
 214         falcon_flash_nand_data.chip.nr_partitions = count;
 215         platform_device_register(&ltq_flash_nand);
 216 }