drivers/mtd/nand/ndfc.c

   1 /*
   2  *  drivers/mtd/ndfc.c
   3  *
   4  *  Overview:
   5  *   Platform independend driver for NDFC (NanD Flash Controller)
   6  *   integrated into EP440 cores
   7  *
   8  *  Author: Thomas Gleixner
   9  *
  10  *  Copyright 2006 IBM
  11  *
  12  *  This program is free software; you can redistribute  it and/or modify it
  13  *  under  the terms of  the GNU General  Public License as published by the
  14  *  Free Software Foundation;  either version 2 of the  License, or (at your
  15  *  option) any later version.
  16  *
  17  */
  18 #include <linux/module.h>
  19 #include <linux/mtd/nand.h>
  20 #include <linux/mtd/nand_ecc.h>
  21 #include <linux/mtd/partitions.h>
  22 #include <linux/mtd/ndfc.h>
  23 #include <linux/mtd/mtd.h>
  24 #include <linux/platform_device.h>
  25
  26 #include <asm/io.h>
  27 #include <asm/ibm44x.h>
  28
  29 struct ndfc_nand_mtd {
  30         struct mtd_info                 mtd;
  31         struct nand_chip                chip;
  32         struct platform_nand_chip       *pl_chip;
  33 };
  34
  35 static struct ndfc_nand_mtd ndfc_mtd[NDFC_MAX_BANKS];
  36
  37 struct ndfc_controller {
  38         void __iomem            *ndfcbase;
  39         struct nand_hw_control  ndfc_control;
  40         atomic_t                childs_active;
  41 };
  42
  43 static struct ndfc_controller ndfc_ctrl;
  44
  45 static void ndfc_select_chip(struct mtd_info *mtd, int chip)
  46 {
  47         uint32_t ccr;
  48         struct ndfc_controller *ndfc = &ndfc_ctrl;
  49         struct nand_chip *nandchip = mtd->priv;
  50         struct ndfc_nand_mtd *nandmtd = nandchip->priv;
  51         struct platform_nand_chip *pchip = nandmtd->pl_chip;
  52
  53         ccr = __raw_readl(ndfc->ndfcbase + NDFC_CCR);
  54         if (chip >= 0) {
  55                 ccr &= ~NDFC_CCR_BS_MASK;
  56                 ccr |= NDFC_CCR_BS(chip + pchip->chip_offset);
  57         } else
  58                 ccr |= NDFC_CCR_RESET_CE;
  59         writel(ccr, ndfc->ndfcbase + NDFC_CCR);
  60 }
  61
  62 static void ndfc_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  63 {
  64         struct ndfc_controller *ndfc = &ndfc_ctrl;
  65
  66         if (cmd == NAND_CMD_NONE)
  67                 return;
  68
  69         if (ctrl & NAND_CLE)
  70                 writel(cmd & 0xFF, ndfc->ndfcbase + NDFC_CMD);
  71         else
  72                 writel(cmd & 0xFF, ndfc->ndfcbase + NDFC_ALE);
  73 }
  74
  75 static int ndfc_ready(struct mtd_info *mtd)
  76 {
  77         struct ndfc_controller *ndfc = &ndfc_ctrl;
  78
  79         return __raw_readl(ndfc->ndfcbase + NDFC_STAT) & NDFC_STAT_IS_READY;
  80 }
  81
  82 static void ndfc_enable_hwecc(struct mtd_info *mtd, int mode)
  83 {
  84         uint32_t ccr;
  85         struct ndfc_controller *ndfc = &ndfc_ctrl;
  86
  87         ccr = __raw_readl(ndfc->ndfcbase + NDFC_CCR);
  88         ccr |= NDFC_CCR_RESET_ECC;
  89         __raw_writel(ccr, ndfc->ndfcbase + NDFC_CCR);
  90         wmb();
  91 }
  92
  93 static int ndfc_calculate_ecc(struct mtd_info *mtd,
  94                               const u_char *dat, u_char *ecc_code)
  95 {
  96         struct ndfc_controller *ndfc = &ndfc_ctrl;
  97         uint32_t ecc;
  98         uint8_t *p = (uint8_t *)&ecc;
  99
 100         wmb();
 101         ecc = __raw_readl(ndfc->ndfcbase + NDFC_ECC);
 102         ecc_code[0] = p[1];
 103         ecc_code[1] = p[2];
 104         ecc_code[2] = p[3];
 105
 106         return 0;
 107 }
 108
 109 /*
 110  * Speedups for buffer read/write/verify
 111  *
 112  * NDFC allows 32bit read/write of data. So we can speed up the buffer
 113  * functions. No further checking, as nand_base will always read/write
 114  * page aligned.
 115  */
 116 static void ndfc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
 117 {
 118         struct ndfc_controller *ndfc = &ndfc_ctrl;
 119         uint32_t *p = (uint32_t *) buf;
 120
 121         for(;len > 0; len -= 4)
 122                 *p++ = __raw_readl(ndfc->ndfcbase + NDFC_DATA);
 123 }
 124
 125 static void ndfc_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
 126 {
 127         struct ndfc_controller *ndfc = &ndfc_ctrl;
 128         uint32_t *p = (uint32_t *) buf;
 129
 130         for(;len > 0; len -= 4)
 131                 __raw_writel(*p++, ndfc->ndfcbase + NDFC_DATA);
 132 }
 133
 134 static int ndfc_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
 135 {
 136         struct ndfc_controller *ndfc = &ndfc_ctrl;
 137         uint32_t *p = (uint32_t *) buf;
 138
 139         for(;len > 0; len -= 4)
 140                 if (*p++ != __raw_readl(ndfc->ndfcbase + NDFC_DATA))
 141                         return -EFAULT;
 142         return 0;
 143 }
 144
 145 /*
 146  * Initialize chip structure
 147  */
 148 static void ndfc_chip_init(struct ndfc_nand_mtd *mtd)
 149 {
 150         struct ndfc_controller *ndfc = &ndfc_ctrl;
 151         struct nand_chip *chip = &mtd->chip;
 152
 153         chip->IO_ADDR_R = ndfc->ndfcbase + NDFC_DATA;
 154         chip->IO_ADDR_W = ndfc->ndfcbase + NDFC_DATA;
 155         chip->cmd_ctrl = ndfc_hwcontrol;
 156         chip->dev_ready = ndfc_ready;
 157         chip->select_chip = ndfc_select_chip;
 158         chip->chip_delay = 50;
 159         chip->priv = mtd;
 160         chip->options = mtd->pl_chip->options;
 161         chip->controller = &ndfc->ndfc_control;
 162         chip->read_buf = ndfc_read_buf;
 163         chip->write_buf = ndfc_write_buf;
 164         chip->verify_buf = ndfc_verify_buf;
 165         chip->ecc.correct = nand_correct_data;
 166         chip->ecc.hwctl = ndfc_enable_hwecc;
 167         chip->ecc.calculate = ndfc_calculate_ecc;
 168         chip->ecc.mode = NAND_ECC_HW;
 169         chip->ecc.size = 256;
 170         chip->ecc.bytes = 3;
 171         chip->ecclayout = chip->ecc.layout = mtd->pl_chip->ecclayout;
 172         mtd->mtd.priv = chip;
 173         mtd->mtd.owner = THIS_MODULE;
 174 }
 175
 176 static int ndfc_chip_probe(struct platform_device *pdev)
 177 {
 178         struct platform_nand_chip *nc = pdev->dev.platform_data;
 179         struct ndfc_chip_settings *settings = nc->priv;
 180         struct ndfc_controller *ndfc = &ndfc_ctrl;
 181         struct ndfc_nand_mtd *nandmtd;
 182
 183         if (nc->chip_offset >= NDFC_MAX_BANKS || nc->nr_chips > NDFC_MAX_BANKS)
 184                 return -EINVAL;
 185
 186         /* Set the bank settings */
 187         __raw_writel(settings->bank_settings,
 188                      ndfc->ndfcbase + NDFC_BCFG0 + (nc->chip_offset << 2));
 189
 190         nandmtd = &ndfc_mtd[pdev->id];
 191         if (nandmtd->pl_chip)
 192                 return -EBUSY;
 193
 194         nandmtd->pl_chip = nc;
 195         ndfc_chip_init(nandmtd);
 196
 197         /* Scan for chips */
 198         if (nand_scan(&nandmtd->mtd, nc->nr_chips)) {
 199                 nandmtd->pl_chip = NULL;
 200                 return -ENODEV;
 201         }
 202
 203 #ifdef CONFIG_MTD_PARTITIONS
 204         printk("Number of partitions %d\n", nc->nr_partitions);
 205         if (nc->nr_partitions) {
 206                 /* Add the full device, so complete dumps can be made */
 207                 add_mtd_device(&nandmtd->mtd);
 208                 add_mtd_partitions(&nandmtd->mtd, nc->partitions,
 209                                    nc->nr_partitions);
 210
 211         } else
 212 #else
 213                 add_mtd_device(&nandmtd->mtd);
 214 #endif
 215
 216         atomic_inc(&ndfc->childs_active);
 217         return 0;
 218 }
 219
 220 static int ndfc_chip_remove(struct platform_device *pdev)
 221 {
 222         return 0;
 223 }
 224
 225 static int ndfc_nand_probe(struct platform_device *pdev)
 226 {
 227         struct platform_nand_ctrl *nc = pdev->dev.platform_data;
 228         struct ndfc_controller_settings *settings = nc->priv;
 229         struct resource *res = pdev->resource;
 230         struct ndfc_controller *ndfc = &ndfc_ctrl;
 231         unsigned long long phys = settings->ndfc_erpn | res->start;
 232
 233         ndfc->ndfcbase = ioremap64(phys, res->end - res->start + 1);
 234         if (!ndfc->ndfcbase) {
 235                 printk(KERN_ERR "NDFC: ioremap failed\n");
 236                 return -EIO;
 237         }
 238
 239         __raw_writel(settings->ccr_settings, ndfc->ndfcbase + NDFC_CCR);
 240
 241         spin_lock_init(&ndfc->ndfc_control.lock);
 242         init_waitqueue_head(&ndfc->ndfc_control.wq);
 243
 244         platform_set_drvdata(pdev, ndfc);
 245
 246         printk("NDFC NAND Driver initialized. Chip-Rev: 0x%08x\n",
 247                __raw_readl(ndfc->ndfcbase + NDFC_REVID));
 248
 249         return 0;
 250 }
 251
 252 static int ndfc_nand_remove(struct platform_device *pdev)
 253 {
 254         struct ndfc_controller *ndfc = platform_get_drvdata(pdev);
 255
 256         if (atomic_read(&ndfc->childs_active))
 257                 return -EBUSY;
 258
 259         if (ndfc) {
 260                 platform_set_drvdata(pdev, NULL);
 261                 iounmap(ndfc_ctrl.ndfcbase);
 262                 ndfc_ctrl.ndfcbase = NULL;
 263         }
 264         return 0;
 265 }
 266
 267 /* driver device registration */
 268
 269 static struct platform_driver ndfc_chip_driver = {
 270         .probe          = ndfc_chip_probe,
 271         .remove         = ndfc_chip_remove,
 272         .driver         = {
 273                 .name   = "ndfc-chip",
 274                 .owner  = THIS_MODULE,
 275         },
 276 };
 277
 278 static struct platform_driver ndfc_nand_driver = {
 279         .probe          = ndfc_nand_probe,
 280         .remove         = ndfc_nand_remove,
 281         .driver         = {
 282                 .name   = "ndfc-nand",
 283                 .owner  = THIS_MODULE,
 284         },
 285 };
 286
 287 static int __init ndfc_nand_init(void)
 288 {
 289         int ret;
 290
 291         spin_lock_init(&ndfc_ctrl.ndfc_control.lock);
 292         init_waitqueue_head(&ndfc_ctrl.ndfc_control.wq);
 293
 294         ret = platform_driver_register(&ndfc_nand_driver);
 295         if (!ret)
 296                 ret = platform_driver_register(&ndfc_chip_driver);
 297         return ret;
 298 }
 299
 300 static void __exit ndfc_nand_exit(void)
 301 {
 302         platform_driver_unregister(&ndfc_chip_driver);
 303         platform_driver_unregister(&ndfc_nand_driver);
 304 }
 305
 306 module_init(ndfc_nand_init);
 307 module_exit(ndfc_nand_exit);
 308
 309 MODULE_LICENSE("GPL");
 310 MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
 311 MODULE_DESCRIPTION("Platform driver for NDFC");