target/linux/mpc83xx/patches-2.6.36/016-drivers_mtd_nand_rbppc_nand.patch

   1 --- /dev/null
   2 +++ b/drivers/mtd/nand/rbppc_nand.c
   3 @@ -0,0 +1,252 @@
   4 +/*
   5 + * Copyright (C) 2008-2009 Noah Fontes <nfontes@transtruct.org>
   6 + * Copyright (C) 2009 Michael Guntsche <mike@it-loops.com>
   7 + * Copyright (C) Mikrotik 2007
   8 + *
   9 + * This program is free software; you can redistribute it and/or modify it
  10 + * under the terms of the GNU General Public License as published by the
  11 + * Free Software Foundation; either version 2 of the License, or (at your
  12 + * option) any later version.
  13 + */
  14 +
  15 +#include <linux/init.h>
  16 +#include <linux/mtd/nand.h>
  17 +#include <linux/mtd/mtd.h>
  18 +#include <linux/mtd/partitions.h>
  19 +#include <linux/of_platform.h>
  20 +#include <asm/of_platform.h>
  21 +#include <asm/of_device.h>
  22 +#include <linux/delay.h>
  23 +#include <asm/io.h>
  24 +
  25 +#define DRV_NAME       "rbppc_nand"
  26 +#define DRV_VERSION    "0.0.2"
  27 +
  28 +static struct mtd_info rmtd;
  29 +static struct nand_chip rnand;
  30 +
  31 +struct rbppc_nand_info {
  32 +       void *gpi;
  33 +       void *gpo;
  34 +       void *localbus;
  35 +
  36 +       unsigned gpio_rdy;
  37 +       unsigned gpio_nce;
  38 +       unsigned gpio_cle;
  39 +       unsigned gpio_ale;
  40 +       unsigned gpio_ctrls;
  41 +};
  42 +
  43 +/* We must use the OOB layout from yaffs 1 if we want this to be recognized
  44 + * properly. Borrowed from the OpenWRT patches for the RB532.
  45 + *
  46 + * See <https://dev.openwrt.org/browser/trunk/target/linux/rb532/
  47 + * patches-2.6.28/025-rb532_nand_fixup.patch> for more details.
  48 + */
  49 +static struct nand_ecclayout rbppc_nand_oob_16 = {
  50 +       .eccbytes = 6,
  51 +       .eccpos = { 8, 9, 10, 13, 14, 15 },
  52 +       .oobavail = 9,
  53 +       .oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
  54 +};
  55 +
  56 +static struct mtd_partition rbppc_nand_partition_info[] = {
  57 +       {
  58 +               name: "kernel",
  59 +               offset: 0,
  60 +               size: 4 * 1024 * 1024,
  61 +       },
  62 +       {
  63 +               name: "rootfs",
  64 +               offset: MTDPART_OFS_NXTBLK,
  65 +               size: MTDPART_SIZ_FULL,
  66 +       },
  67 +};
  68 +
  69 +static int rbppc_nand_dev_ready(struct mtd_info *mtd) {
  70 +       struct nand_chip *chip = mtd->priv;
  71 +       struct rbppc_nand_info *priv = chip->priv;
  72 +
  73 +       return in_be32(priv->gpi) & priv->gpio_rdy;
  74 +}
  75 +
  76 +static void rbppc_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) {
  77 +       struct nand_chip *chip = mtd->priv;
  78 +       struct rbppc_nand_info *priv = chip->priv;
  79 +
  80 +       if (ctrl & NAND_CTRL_CHANGE) {
  81 +               unsigned val = in_be32(priv->gpo);
  82 +               if (!(val & priv->gpio_nce)) {
  83 +                       /* make sure Local Bus has done NAND operations */
  84 +                       readb(priv->localbus);
  85 +               }
  86 +
  87 +               if (ctrl & NAND_CLE) {
  88 +                       val |= priv->gpio_cle;
  89 +               } else {
  90 +                       val &= ~priv->gpio_cle;
  91 +               }
  92 +               if (ctrl & NAND_ALE) {
  93 +                       val |= priv->gpio_ale;
  94 +               } else {
  95 +                       val &= ~priv->gpio_ale;
  96 +               }
  97 +               if (!(ctrl & NAND_NCE)) {
  98 +                       val |= priv->gpio_nce;
  99 +               } else {
 100 +                       val &= ~priv->gpio_nce;
 101 +               }
 102 +               out_be32(priv->gpo, val);
 103 +
 104 +               /* make sure GPIO output has changed */
 105 +               val ^= in_be32(priv->gpo);
 106 +               if (val & priv->gpio_ctrls) {
 107 +                       printk(KERN_ERR "rbppc_nand_hwcontrol: NAND GPO change failed 0x%08x\n", val);
 108 +               }
 109 +       }
 110 +
 111 +       if (cmd != NAND_CMD_NONE) writeb(cmd, chip->IO_ADDR_W);
 112 +}
 113 +
 114 +static void rbppc_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
 115 +{
 116 +       struct nand_chip *chip = mtd->priv;
 117 +       memcpy(buf, chip->IO_ADDR_R, len);
 118 +}
 119 +
 120 +static unsigned init_ok = 0;
 121 +
 122 +static int rbppc_nand_probe(struct of_device *pdev,
 123 +                           const struct of_device_id *match)
 124 +{
 125 +       struct device_node *gpio;
 126 +       struct device_node *nnand;
 127 +       struct resource res;
 128 +       struct rbppc_nand_info *info;
 129 +       void *baddr;
 130 +       const unsigned *rdy, *nce, *cle, *ale;
 131 +
 132 +       printk(KERN_INFO "rbppc_nand_probe: MikroTik RouterBOARD 600 series NAND driver, version " DRV_VERSION "\n");
 133 +
 134 +       info = kmalloc(sizeof(*info), GFP_KERNEL);
 135 +
 136 +       rdy = of_get_property(pdev->node, "rdy", NULL);
 137 +       nce = of_get_property(pdev->node, "nce", NULL);
 138 +       cle = of_get_property(pdev->node, "cle", NULL);
 139 +       ale = of_get_property(pdev->node, "ale", NULL);
 140 +
 141 +       if (!rdy || !nce || !cle || !ale) {
 142 +               printk(KERN_ERR "rbppc_nand_probe: GPIO properties are missing\n");
 143 +               goto err;
 144 +       }
 145 +       if (rdy[0] != nce[0] || rdy[0] != cle[0] || rdy[0] != ale[0]) {
 146 +               printk(KERN_ERR "rbppc_nand_probe: Different GPIOs are not supported\n");
 147 +               goto err;
 148 +       }
 149 +
 150 +       gpio = of_find_node_by_phandle(rdy[0]);
 151 +       if (!gpio) {
 152 +               printk(KERN_ERR "rbppc_nand_probe: No GPIO<%x> node found\n", *rdy);
 153 +               goto err;
 154 +       }
 155 +       if (of_address_to_resource(gpio, 0, &res)) {
 156 +               printk(KERN_ERR "rbppc_nand_probe: No reg property in GPIO found\n");
 157 +               goto err;
 158 +       }
 159 +       info->gpo = ioremap_nocache(res.start, res.end - res.start + 1);
 160 +
 161 +       if (!of_address_to_resource(gpio, 1, &res)) {
 162 +               info->gpi = ioremap_nocache(res.start, res.end - res.start + 1);
 163 +       } else {
 164 +               info->gpi = info->gpo;
 165 +       }
 166 +       of_node_put(gpio);
 167 +
 168 +       info->gpio_rdy = 1 << (31 - rdy[1]);
 169 +       info->gpio_nce = 1 << (31 - nce[1]);
 170 +       info->gpio_cle = 1 << (31 - cle[1]);
 171 +       info->gpio_ale = 1 << (31 - ale[1]);
 172 +       info->gpio_ctrls = info->gpio_nce | info->gpio_cle | info->gpio_ale;
 173 +
 174 +       nnand = of_find_node_by_name(NULL, "nnand");
 175 +       if (!nnand) {
 176 +               printk("rbppc_nand_probe: No nNAND found\n");
 177 +               goto err;
 178 +       }
 179 +       if (of_address_to_resource(nnand, 0, &res)) {
 180 +               printk("rbppc_nand_probe: No reg property in nNAND found\n");
 181 +               goto err;
 182 +       }
 183 +       of_node_put(nnand);
 184 +       info->localbus = ioremap_nocache(res.start, res.end - res.start + 1);
 185 +
 186 +       if (of_address_to_resource(pdev->node, 0, &res)) {
 187 +           printk("rbppc_nand_probe: No reg property found\n");
 188 +           goto err;
 189 +       }
 190 +       baddr = ioremap_nocache(res.start, res.end - res.start + 1);
 191 +
 192 +       memset(&rnand, 0, sizeof(rnand));
 193 +       rnand.cmd_ctrl = rbppc_nand_cmd_ctrl;
 194 +       rnand.dev_ready = rbppc_nand_dev_ready;
 195 +       rnand.read_buf = rbppc_nand_read_buf;
 196 +       rnand.IO_ADDR_W = baddr;
 197 +       rnand.IO_ADDR_R = baddr;
 198 +       rnand.priv = info;
 199 +
 200 +       memset(&rmtd, 0, sizeof(rmtd));
 201 +       rnand.ecc.mode = NAND_ECC_SOFT;
 202 +       rnand.ecc.layout = &rbppc_nand_oob_16;
 203 +       rnand.chip_delay = 25;
 204 +       rnand.options |= NAND_NO_AUTOINCR;
 205 +       rmtd.priv = &rnand;
 206 +       rmtd.owner = THIS_MODULE;
 207 +
 208 +       if (nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1)) {
 209 +               printk(KERN_ERR "rbppc_nand_probe: RouterBOARD NAND device not found\n");
 210 +               return -ENXIO;
 211 +       }
 212 +
 213 +       add_mtd_partitions(&rmtd, rbppc_nand_partition_info, 2);
 214 +       init_ok = 1;
 215 +       return 0;
 216 +
 217 +err:
 218 +       kfree(info);
 219 +       return -1;
 220 +}
 221 +
 222 +static struct of_device_id rbppc_nand_ids[] = {
 223 +       { .name = "nand", },
 224 +       { },
 225 +};
 226 +
 227 +static struct of_platform_driver rbppc_nand_driver = {
 228 +       .name   = "nand",
 229 +       .probe  = rbppc_nand_probe,
 230 +       .match_table = rbppc_nand_ids,
 231 +       .driver = {
 232 +               .name = "rbppc-nand",
 233 +               .owner = THIS_MODULE,
 234 +       },
 235 +};
 236 +
 237 +static int __init rbppc_nand_init(void)
 238 +{
 239 +       return of_register_platform_driver(&rbppc_nand_driver);
 240 +}
 241 +
 242 +static void __exit rbppc_nand_exit(void)
 243 +{
 244 +       of_unregister_platform_driver(&rbppc_nand_driver);
 245 +}
 246 +
 247 +MODULE_AUTHOR("Mikrotikls SIA");
 248 +MODULE_AUTHOR("Noah Fontes");
 249 +MODULE_AUTHOR("Michael Guntsche");
 250 +MODULE_DESCRIPTION("MikroTik RouterBOARD 600 series NAND driver");
 251 +MODULE_LICENSE("GPL");
 252 +MODULE_VERSION(DRV_VERSION);
 253 +
 254 +module_init(rbppc_nand_init);
 255 +module_exit(rbppc_nand_exit);