target/linux/mpc83xx/patches-3.18/203-mtd-add-rbppc_nand-driver.patch

   1 --- a/drivers/mtd/nand/Kconfig
   2 +++ b/drivers/mtd/nand/Kconfig
   3 @@ -408,6 +408,13 @@ config MTD_NAND_PLATFORM
   4           devices. You will need to provide platform-specific functions
   5           via platform_data.
   6
   7 +config MTD_NAND_RB_PPC
   8 +       tristate "MikroTik RB333/600 NAND support"
   9 +       depends on RB_PPC
  10 +       help
  11 +         This option enables support for the NAND device on MikroTik
  12 +         RouterBOARD 333/600 series boards.
  13 +
  14  config MTD_NAND_ORION
  15         tristate "NAND Flash support for Marvell Orion SoC"
  16         depends on PLAT_ORION
  17 --- a/drivers/mtd/nand/Makefile
  18 +++ b/drivers/mtd/nand/Makefile
  19 @@ -32,6 +32,7 @@ obj-$(CONFIG_MTD_NAND_CM_X270)                += cmx27
  20  obj-$(CONFIG_MTD_NAND_PXA3xx)          += pxa3xx_nand.o
  21  obj-$(CONFIG_MTD_NAND_TMIO)            += tmio_nand.o
  22  obj-$(CONFIG_MTD_NAND_PLATFORM)                += plat_nand.o
  23 +obj-$(CONFIG_MTD_NAND_RB_PPC)          += rbppc_nand.o
  24  obj-$(CONFIG_MTD_NAND_PASEMI)          += pasemi_nand.o
  25  obj-$(CONFIG_MTD_NAND_ORION)           += orion_nand.o
  26  obj-$(CONFIG_MTD_NAND_FSL_ELBC)                += fsl_elbc_nand.o
  27 --- /dev/null
  28 +++ b/drivers/mtd/nand/rbppc_nand.c
  29 @@ -0,0 +1,251 @@
  30 +/*
  31 + * Copyright (C) 2008-2009 Noah Fontes <nfontes@transtruct.org>
  32 + * Copyright (C) 2009 Michael Guntsche <mike@it-loops.com>
  33 + * Copyright (C) Mikrotik 2007
  34 + *
  35 + * This program is free software; you can redistribute it and/or modify it
  36 + * under the terms of the GNU General Public License as published by the
  37 + * Free Software Foundation; either version 2 of the License, or (at your
  38 + * option) any later version.
  39 + */
  40 +
  41 +#include <linux/init.h>
  42 +#include <linux/module.h>
  43 +#include <linux/mtd/nand.h>
  44 +#include <linux/mtd/mtd.h>
  45 +#include <linux/mtd/partitions.h>
  46 +#include <linux/of_platform.h>
  47 +#include <linux/of_device.h>
  48 +#include <linux/slab.h>
  49 +#include <linux/delay.h>
  50 +#include <linux/of_address.h>
  51 +#include <asm/io.h>
  52 +
  53 +#define DRV_NAME       "rbppc_nand"
  54 +#define DRV_VERSION    "0.0.2"
  55 +
  56 +static struct mtd_info rmtd;
  57 +static struct nand_chip rnand;
  58 +
  59 +struct rbppc_nand_info {
  60 +       void *gpi;
  61 +       void *gpo;
  62 +       void *localbus;
  63 +
  64 +       unsigned gpio_rdy;
  65 +       unsigned gpio_nce;
  66 +       unsigned gpio_cle;
  67 +       unsigned gpio_ale;
  68 +       unsigned gpio_ctrls;
  69 +};
  70 +
  71 +/* We must use the OOB layout from yaffs 1 if we want this to be recognized
  72 + * properly. Borrowed from the OpenWRT patches for the RB532.
  73 + *
  74 + * See <https://dev.openwrt.org/browser/trunk/target/linux/rb532/
  75 + * patches-2.6.28/025-rb532_nand_fixup.patch> for more details.
  76 + */
  77 +static struct nand_ecclayout rbppc_nand_oob_16 = {
  78 +       .eccbytes = 6,
  79 +       .eccpos = { 8, 9, 10, 13, 14, 15 },
  80 +       .oobavail = 9,
  81 +       .oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
  82 +};
  83 +
  84 +static struct mtd_partition rbppc_nand_partition_info[] = {
  85 +       {
  86 +               name: "kernel",
  87 +               offset: 0,
  88 +               size: 4 * 1024 * 1024,
  89 +       },
  90 +       {
  91 +               name: "rootfs",
  92 +               offset: MTDPART_OFS_NXTBLK,
  93 +               size: MTDPART_SIZ_FULL,
  94 +       },
  95 +};
  96 +
  97 +static int rbppc_nand_dev_ready(struct mtd_info *mtd) {
  98 +       struct nand_chip *chip = mtd->priv;
  99 +       struct rbppc_nand_info *priv = chip->priv;
 100 +
 101 +       return in_be32(priv->gpi) & priv->gpio_rdy;
 102 +}
 103 +
 104 +static void rbppc_nand_cmd_ctrl(struct mtd_info *mtd, int cmd, unsigned int ctrl) {
 105 +       struct nand_chip *chip = mtd->priv;
 106 +       struct rbppc_nand_info *priv = chip->priv;
 107 +
 108 +       if (ctrl & NAND_CTRL_CHANGE) {
 109 +               unsigned val = in_be32(priv->gpo);
 110 +               if (!(val & priv->gpio_nce)) {
 111 +                       /* make sure Local Bus has done NAND operations */
 112 +                       readb(priv->localbus);
 113 +               }
 114 +
 115 +               if (ctrl & NAND_CLE) {
 116 +                       val |= priv->gpio_cle;
 117 +               } else {
 118 +                       val &= ~priv->gpio_cle;
 119 +               }
 120 +               if (ctrl & NAND_ALE) {
 121 +                       val |= priv->gpio_ale;
 122 +               } else {
 123 +                       val &= ~priv->gpio_ale;
 124 +               }
 125 +               if (!(ctrl & NAND_NCE)) {
 126 +                       val |= priv->gpio_nce;
 127 +               } else {
 128 +                       val &= ~priv->gpio_nce;
 129 +               }
 130 +               out_be32(priv->gpo, val);
 131 +
 132 +               /* make sure GPIO output has changed */
 133 +               val ^= in_be32(priv->gpo);
 134 +               if (val & priv->gpio_ctrls) {
 135 +                       printk(KERN_ERR "rbppc_nand_hwcontrol: NAND GPO change failed 0x%08x\n", val);
 136 +               }
 137 +       }
 138 +
 139 +       if (cmd != NAND_CMD_NONE) writeb(cmd, chip->IO_ADDR_W);
 140 +}
 141 +
 142 +static void rbppc_nand_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
 143 +{
 144 +       struct nand_chip *chip = mtd->priv;
 145 +       memcpy(buf, chip->IO_ADDR_R, len);
 146 +}
 147 +
 148 +static unsigned init_ok = 0;
 149 +
 150 +static int rbppc_nand_probe(struct platform_device *pdev)
 151 +{
 152 +       struct device_node *gpio;
 153 +       struct device_node *nnand;
 154 +       struct resource res;
 155 +       struct rbppc_nand_info *info;
 156 +       void *baddr;
 157 +       const unsigned *rdy, *nce, *cle, *ale;
 158 +
 159 +       printk(KERN_INFO "rbppc_nand_probe: MikroTik RouterBOARD 333/600 series NAND driver, version " DRV_VERSION "\n");
 160 +
 161 +       info = kmalloc(sizeof(*info), GFP_KERNEL);
 162 +
 163 +       rdy = of_get_property(pdev->dev.of_node, "rdy", NULL);
 164 +       nce = of_get_property(pdev->dev.of_node, "nce", NULL);
 165 +       cle = of_get_property(pdev->dev.of_node, "cle", NULL);
 166 +       ale = of_get_property(pdev->dev.of_node, "ale", NULL);
 167 +
 168 +       if (!rdy || !nce || !cle || !ale) {
 169 +               printk(KERN_ERR "rbppc_nand_probe: GPIO properties are missing\n");
 170 +               goto err;
 171 +       }
 172 +       if (rdy[0] != nce[0] || rdy[0] != cle[0] || rdy[0] != ale[0]) {
 173 +               printk(KERN_ERR "rbppc_nand_probe: Different GPIOs are not supported\n");
 174 +               goto err;
 175 +       }
 176 +
 177 +       gpio = of_find_node_by_phandle(rdy[0]);
 178 +       if (!gpio) {
 179 +               printk(KERN_ERR "rbppc_nand_probe: No GPIO<%x> node found\n", *rdy);
 180 +               goto err;
 181 +       }
 182 +       if (of_address_to_resource(gpio, 0, &res)) {
 183 +               printk(KERN_ERR "rbppc_nand_probe: No reg property in GPIO found\n");
 184 +               goto err;
 185 +       }
 186 +       info->gpo = ioremap_nocache(res.start, res.end - res.start + 1);
 187 +
 188 +       if (!of_address_to_resource(gpio, 1, &res)) {
 189 +               info->gpi = ioremap_nocache(res.start, res.end - res.start + 1);
 190 +       } else {
 191 +               info->gpi = info->gpo;
 192 +       }
 193 +       of_node_put(gpio);
 194 +
 195 +       info->gpio_rdy = 1 << (31 - rdy[1]);
 196 +       info->gpio_nce = 1 << (31 - nce[1]);
 197 +       info->gpio_cle = 1 << (31 - cle[1]);
 198 +       info->gpio_ale = 1 << (31 - ale[1]);
 199 +       info->gpio_ctrls = info->gpio_nce | info->gpio_cle | info->gpio_ale;
 200 +
 201 +       nnand = of_find_node_by_name(NULL, "nnand");
 202 +       if (!nnand) {
 203 +               printk("rbppc_nand_probe: No nNAND found\n");
 204 +               goto err;
 205 +       }
 206 +       if (of_address_to_resource(nnand, 0, &res)) {
 207 +               printk("rbppc_nand_probe: No reg property in nNAND found\n");
 208 +               goto err;
 209 +       }
 210 +       of_node_put(nnand);
 211 +       info->localbus = ioremap_nocache(res.start, res.end - res.start + 1);
 212 +
 213 +       if (of_address_to_resource(pdev->dev.of_node, 0, &res)) {
 214 +           printk("rbppc_nand_probe: No reg property found\n");
 215 +           goto err;
 216 +       }
 217 +       baddr = ioremap_nocache(res.start, res.end - res.start + 1);
 218 +
 219 +       memset(&rnand, 0, sizeof(rnand));
 220 +       rnand.cmd_ctrl = rbppc_nand_cmd_ctrl;
 221 +       rnand.dev_ready = rbppc_nand_dev_ready;
 222 +       rnand.read_buf = rbppc_nand_read_buf;
 223 +       rnand.IO_ADDR_W = baddr;
 224 +       rnand.IO_ADDR_R = baddr;
 225 +       rnand.priv = info;
 226 +
 227 +       memset(&rmtd, 0, sizeof(rmtd));
 228 +       rnand.ecc.mode = NAND_ECC_SOFT;
 229 +       rnand.ecc.layout = &rbppc_nand_oob_16;
 230 +       rnand.chip_delay = 25;
 231 +       rmtd.priv = &rnand;
 232 +       rmtd.owner = THIS_MODULE;
 233 +
 234 +       if (nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1) && nand_scan(&rmtd, 1)) {
 235 +               printk(KERN_ERR "rbppc_nand_probe: RouterBOARD NAND device not found\n");
 236 +               return -ENXIO;
 237 +       }
 238 +
 239 +       mtd_device_parse_register(&rmtd, NULL, 0, rbppc_nand_partition_info, 2);
 240 +       init_ok = 1;
 241 +       return 0;
 242 +
 243 +err:
 244 +       kfree(info);
 245 +       return -1;
 246 +}
 247 +
 248 +static struct of_device_id rbppc_nand_ids[] = {
 249 +       { .name = "nand", },
 250 +       { },
 251 +};
 252 +
 253 +static struct platform_driver rbppc_nand_driver = {
 254 +       .probe  = rbppc_nand_probe,
 255 +       .driver = {
 256 +               .name = "rbppc-nand",
 257 +               .owner = THIS_MODULE,
 258 +               .of_match_table = rbppc_nand_ids,
 259 +       },
 260 +};
 261 +
 262 +static int __init rbppc_nand_init(void)
 263 +{
 264 +       return platform_driver_register(&rbppc_nand_driver);
 265 +}
 266 +
 267 +static void __exit rbppc_nand_exit(void)
 268 +{
 269 +       platform_driver_unregister(&rbppc_nand_driver);
 270 +}
 271 +
 272 +MODULE_AUTHOR("Mikrotikls SIA");
 273 +MODULE_AUTHOR("Noah Fontes");
 274 +MODULE_AUTHOR("Michael Guntsche");
 275 +MODULE_DESCRIPTION("MikroTik RouterBOARD 333/600 series NAND driver");
 276 +MODULE_LICENSE("GPL");
 277 +MODULE_VERSION(DRV_VERSION);
 278 +
 279 +module_init(rbppc_nand_init);
 280 +module_exit(rbppc_nand_exit);