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 #ifdef CONFIG_40x
  28 #include <asm/ibm405.h>
  29 #else
  30 #include <asm/ibm44x.h>
  31 #endif
  32
  33 struct ndfc_nand_mtd {
  34         struct mtd_info                 mtd;
  35         struct nand_chip                chip;
  36         struct platform_nand_chip       *pl_chip;
  37 };
  38
  39 static struct ndfc_nand_mtd ndfc_mtd[NDFC_MAX_BANKS];
  40
  41 struct ndfc_controller {
  42         void __iomem            *ndfcbase;
  43         struct nand_hw_control  ndfc_control;
  44         atomic_t                childs_active;
  45 };
  46
  47 static struct ndfc_controller ndfc_ctrl;
  48
  49 static void ndfc_select_chip(struct mtd_info *mtd, int chip)
  50 {
  51         uint32_t ccr;
  52         struct ndfc_controller *ndfc = &ndfc_ctrl;
  53         struct nand_chip *nandchip = mtd->priv;
  54         struct ndfc_nand_mtd *nandmtd = nandchip->priv;
  55         struct platform_nand_chip *pchip = nandmtd->pl_chip;
  56
  57         ccr = __raw_readl(ndfc->ndfcbase + NDFC_CCR);
  58         if (chip >= 0) {
  59                 ccr &= ~NDFC_CCR_BS_MASK;
  60                 ccr |= NDFC_CCR_BS(chip + pchip->chip_offset);
  61         } else
  62                 ccr |= NDFC_CCR_RESET_CE;
  63         __raw_writel(ccr, ndfc->ndfcbase + NDFC_CCR);
  64 }
  65
  66 static void ndfc_hwcontrol(struct mtd_info *mtd, int cmd, unsigned int ctrl)
  67 {
  68         struct ndfc_controller *ndfc = &ndfc_ctrl;
  69
  70         if (cmd == NAND_CMD_NONE)
  71                 return;
  72
  73         if (ctrl & NAND_CLE)
  74                 writel(cmd & 0xFF, ndfc->ndfcbase + NDFC_CMD);
  75         else
  76                 writel(cmd & 0xFF, ndfc->ndfcbase + NDFC_ALE);
  77 }
  78
  79 static int ndfc_ready(struct mtd_info *mtd)
  80 {
  81         struct ndfc_controller *ndfc = &ndfc_ctrl;
  82
  83         return __raw_readl(ndfc->ndfcbase + NDFC_STAT) & NDFC_STAT_IS_READY;
  84 }
  85
  86 static void ndfc_enable_hwecc(struct mtd_info *mtd, int mode)
  87 {
  88         uint32_t ccr;
  89         struct ndfc_controller *ndfc = &ndfc_ctrl;
  90
  91         ccr = __raw_readl(ndfc->ndfcbase + NDFC_CCR);
  92         ccr |= NDFC_CCR_RESET_ECC;
  93         __raw_writel(ccr, ndfc->ndfcbase + NDFC_CCR);
  94         wmb();
  95 }
  96
  97 static int ndfc_calculate_ecc(struct mtd_info *mtd,
  98                               const u_char *dat, u_char *ecc_code)
  99 {
 100         struct ndfc_controller *ndfc = &ndfc_ctrl;
 101         uint32_t ecc;
 102         uint8_t *p = (uint8_t *)&ecc;
 103
 104         wmb();
 105         ecc = __raw_readl(ndfc->ndfcbase + NDFC_ECC);
 106         ecc_code[0] = p[1];
 107         ecc_code[1] = p[2];
 108         ecc_code[2] = p[3];
 109
 110         return 0;
 111 }
 112
 113 /*
 114  * Speedups for buffer read/write/verify
 115  *
 116  * NDFC allows 32bit read/write of data. So we can speed up the buffer
 117  * functions. No further checking, as nand_base will always read/write
 118  * page aligned.
 119  */
 120 static void ndfc_read_buf(struct mtd_info *mtd, uint8_t *buf, int len)
 121 {
 122         struct ndfc_controller *ndfc = &ndfc_ctrl;
 123         uint32_t *p = (uint32_t *) buf;
 124
 125         for(;len > 0; len -= 4)
 126                 *p++ = __raw_readl(ndfc->ndfcbase + NDFC_DATA);
 127 }
 128
 129 static void ndfc_write_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
 130 {
 131         struct ndfc_controller *ndfc = &ndfc_ctrl;
 132         uint32_t *p = (uint32_t *) buf;
 133
 134         for(;len > 0; len -= 4)
 135                 __raw_writel(*p++, ndfc->ndfcbase + NDFC_DATA);
 136 }
 137
 138 static int ndfc_verify_buf(struct mtd_info *mtd, const uint8_t *buf, int len)
 139 {
 140         struct ndfc_controller *ndfc = &ndfc_ctrl;
 141         uint32_t *p = (uint32_t *) buf;
 142
 143         for(;len > 0; len -= 4)
 144                 if (*p++ != __raw_readl(ndfc->ndfcbase + NDFC_DATA))
 145                         return -EFAULT;
 146         return 0;
 147 }
 148
 149 /*
 150  * Initialize chip structure
 151  */
 152 static void ndfc_chip_init(struct ndfc_nand_mtd *mtd)
 153 {
 154         struct ndfc_controller *ndfc = &ndfc_ctrl;
 155         struct nand_chip *chip = &mtd->chip;
 156
 157         chip->IO_ADDR_R = ndfc->ndfcbase + NDFC_DATA;
 158         chip->IO_ADDR_W = ndfc->ndfcbase + NDFC_DATA;
 159         chip->cmd_ctrl = ndfc_hwcontrol;
 160         chip->dev_ready = ndfc_ready;
 161         chip->select_chip = ndfc_select_chip;
 162         chip->chip_delay = 50;
 163         chip->priv = mtd;
 164         chip->options = mtd->pl_chip->options;
 165         chip->controller = &ndfc->ndfc_control;
 166         chip->read_buf = ndfc_read_buf;
 167         chip->write_buf = ndfc_write_buf;
 168         chip->verify_buf = ndfc_verify_buf;
 169         chip->ecc.correct = nand_correct_data;
 170         chip->ecc.hwctl = ndfc_enable_hwecc;
 171         chip->ecc.calculate = ndfc_calculate_ecc;
 172         chip->ecc.mode = NAND_ECC_HW;
 173         chip->ecc.size = 256;
 174         chip->ecc.bytes = 3;
 175         chip->ecclayout = chip->ecc.layout = mtd->pl_chip->ecclayout;
 176         mtd->mtd.priv = chip;
 177         mtd->mtd.owner = THIS_MODULE;
 178 }
 179
 180 static int ndfc_chip_probe(struct platform_device *pdev)
 181 {
 182         struct platform_nand_chip *nc = pdev->dev.platform_data;
 183         struct ndfc_chip_settings *settings = nc->priv;
 184         struct ndfc_controller *ndfc = &ndfc_ctrl;
 185         struct ndfc_nand_mtd *nandmtd;
 186
 187         if (nc->chip_offset >= NDFC_MAX_BANKS || nc->nr_chips > NDFC_MAX_BANKS)
 188                 return -EINVAL;
 189
 190         /* Set the bank settings */
 191         __raw_writel(settings->bank_settings,
 192                      ndfc->ndfcbase + NDFC_BCFG0 + (nc->chip_offset << 2));
 193
 194         nandmtd = &ndfc_mtd[pdev->id];
 195         if (nandmtd->pl_chip)
 196                 return -EBUSY;
 197
 198         nandmtd->pl_chip = nc;
 199         ndfc_chip_init(nandmtd);
 200
 201         /* Scan for chips */
 202         if (nand_scan(&nandmtd->mtd, nc->nr_chips)) {
 203                 nandmtd->pl_chip = NULL;
 204                 return -ENODEV;
 205         }
 206
 207 #ifdef CONFIG_MTD_PARTITIONS
 208         printk("Number of partitions %d\n", nc->nr_partitions);
 209         if (nc->nr_partitions) {
 210                 /* Add the full device, so complete dumps can be made */
 211                 add_mtd_device(&nandmtd->mtd);
 212                 add_mtd_partitions(&nandmtd->mtd, nc->partitions,
 213                                    nc->nr_partitions);
 214
 215         } else
 216 #else
 217                 add_mtd_device(&nandmtd->mtd);
 218 #endif
 219
 220         atomic_inc(&ndfc->childs_active);
 221         return 0;
 222 }
 223
 224 static int ndfc_chip_remove(struct platform_device *pdev)
 225 {
 226         return 0;
 227 }
 228
 229 static int ndfc_nand_probe(struct platform_device *pdev)
 230 {
 231         struct platform_nand_ctrl *nc = pdev->dev.platform_data;
 232         struct ndfc_controller_settings *settings = nc->priv;
 233         struct resource *res = pdev->resource;
 234         struct ndfc_controller *ndfc = &ndfc_ctrl;
 235         unsigned long long phys = settings->ndfc_erpn | res->start;
 236
 237 #ifndef CONFIG_PHYS_64BIT
 238         ndfc->ndfcbase = ioremap((phys_addr_t)phys, res->end - res->start + 1);
 239 #else
 240         ndfc->ndfcbase = ioremap64(phys, res->end - res->start + 1);
 241 #endif
 242         if (!ndfc->ndfcbase) {
 243                 printk(KERN_ERR "NDFC: ioremap failed\n");
 244                 return -EIO;
 245         }
 246
 247         __raw_writel(settings->ccr_settings, ndfc->ndfcbase + NDFC_CCR);
 248
 249         spin_lock_init(&ndfc->ndfc_control.lock);
 250         init_waitqueue_head(&ndfc->ndfc_control.wq);
 251
 252         platform_set_drvdata(pdev, ndfc);
 253
 254         printk("NDFC NAND Driver initialized. Chip-Rev: 0x%08x\n",
 255                __raw_readl(ndfc->ndfcbase + NDFC_REVID));
 256
 257         return 0;
 258 }
 259
 260 static int ndfc_nand_remove(struct platform_device *pdev)
 261 {
 262         struct ndfc_controller *ndfc = platform_get_drvdata(pdev);
 263
 264         if (atomic_read(&ndfc->childs_active))
 265                 return -EBUSY;
 266
 267         if (ndfc) {
 268                 platform_set_drvdata(pdev, NULL);
 269                 iounmap(ndfc_ctrl.ndfcbase);
 270                 ndfc_ctrl.ndfcbase = NULL;
 271         }
 272         return 0;
 273 }
 274
 275 /* driver device registration */
 276
 277 static struct platform_driver ndfc_chip_driver = {
 278         .probe          = ndfc_chip_probe,
 279         .remove         = ndfc_chip_remove,
 280         .driver         = {
 281                 .name   = "ndfc-chip",
 282                 .owner  = THIS_MODULE,
 283         },
 284 };
 285
 286 static struct platform_driver ndfc_nand_driver = {
 287         .probe          = ndfc_nand_probe,
 288         .remove         = ndfc_nand_remove,
 289         .driver         = {
 290                 .name   = "ndfc-nand",
 291                 .owner  = THIS_MODULE,
 292         },
 293 };
 294
 295 static int __init ndfc_nand_init(void)
 296 {
 297         int ret;
 298
 299         spin_lock_init(&ndfc_ctrl.ndfc_control.lock);
 300         init_waitqueue_head(&ndfc_ctrl.ndfc_control.wq);
 301
 302         ret = platform_driver_register(&ndfc_nand_driver);
 303         if (!ret)
 304                 ret = platform_driver_register(&ndfc_chip_driver);
 305         return ret;
 306 }
 307
 308 static void __exit ndfc_nand_exit(void)
 309 {
 310         platform_driver_unregister(&ndfc_chip_driver);
 311         platform_driver_unregister(&ndfc_nand_driver);
 312 }
 313
 314 module_init(ndfc_nand_init);
 315 module_exit(ndfc_nand_exit);
 316
 317 MODULE_LICENSE("GPL");
 318 MODULE_AUTHOR("Thomas Gleixner <tglx@linutronix.de>");
 319 MODULE_DESCRIPTION("Platform driver for NDFC");