drivers/mtd/nand/ppchameleonevb.c

   1 /*
   2  *  drivers/mtd/nand/ppchameleonevb.c
   3  *
   4  *  Copyright (C) 2003 DAVE Srl (info@wawnet.biz)
   5  *
   6  *  Derived from drivers/mtd/nand/edb7312.c
   7  *
   8  *
   9  * $Id: ppchameleonevb.c,v 1.6 2004/11/05 16:07:16 kalev Exp $
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  *
  15  *  Overview:
  16  *   This is a device driver for the NAND flash devices found on the
  17  *   PPChameleon/PPChameleonEVB system.
  18  *   PPChameleon options (autodetected):
  19  *   - BA model: no NAND
  20  *   - ME model: 32MB (Samsung K9F5608U0B)
  21  *   - HI model: 128MB (Samsung K9F1G08UOM)
  22  *   PPChameleonEVB options:
  23  *   - 32MB (Samsung K9F5608U0B)
  24  */
  25
  26 #include <linux/init.h>
  27 #include <linux/slab.h>
  28 #include <linux/module.h>
  29 #include <linux/mtd/mtd.h>
  30 #include <linux/mtd/nand.h>
  31 #include <linux/mtd/partitions.h>
  32 #include <asm/io.h>
  33 #include <platforms/PPChameleonEVB.h>
  34
  35 #undef USE_READY_BUSY_PIN
  36 #define USE_READY_BUSY_PIN
  37 /* see datasheets (tR) */
  38 #define NAND_BIG_DELAY_US               25
  39 #define NAND_SMALL_DELAY_US             10
  40
  41 /* handy sizes */
  42 #define SZ_4M                           0x00400000
  43 #define NAND_SMALL_SIZE                 0x02000000
  44 #define NAND_MTD_NAME           "ppchameleon-nand"
  45 #define NAND_EVB_MTD_NAME       "ppchameleonevb-nand"
  46
  47 /* GPIO pins used to drive NAND chip mounted on processor module */
  48 #define NAND_nCE_GPIO_PIN               (0x80000000 >> 1)
  49 #define NAND_CLE_GPIO_PIN               (0x80000000 >> 2)
  50 #define NAND_ALE_GPIO_PIN               (0x80000000 >> 3)
  51 #define NAND_RB_GPIO_PIN                (0x80000000 >> 4)
  52 /* GPIO pins used to drive NAND chip mounted on EVB */
  53 #define NAND_EVB_nCE_GPIO_PIN   (0x80000000 >> 14)
  54 #define NAND_EVB_CLE_GPIO_PIN   (0x80000000 >> 15)
  55 #define NAND_EVB_ALE_GPIO_PIN   (0x80000000 >> 16)
  56 #define NAND_EVB_RB_GPIO_PIN    (0x80000000 >> 31)
  57
  58 /*
  59  * MTD structure for PPChameleonEVB board
  60  */
  61 static struct mtd_info *ppchameleon_mtd         = NULL;
  62 static struct mtd_info *ppchameleonevb_mtd = NULL;
  63
  64 /*
  65  * Module stuff
  66  */
  67 static unsigned long ppchameleon_fio_pbase      = CFG_NAND0_PADDR;
  68 static unsigned long ppchameleonevb_fio_pbase = CFG_NAND1_PADDR;
  69
  70 #ifdef MODULE
  71 module_param(ppchameleon_fio_pbase, ulong, 0);
  72 module_param(ppchameleonevb_fio_pbase, ulong, 0);
  73 #else
  74 __setup("ppchameleon_fio_pbase=",ppchameleon_fio_pbase);
  75 __setup("ppchameleonevb_fio_pbase=",ppchameleonevb_fio_pbase);
  76 #endif
  77
  78 #ifdef CONFIG_MTD_PARTITIONS
  79 /*
  80  * Define static partitions for flash devices
  81  */
  82 static struct mtd_partition partition_info_hi[] = {
  83         { name: "PPChameleon HI Nand Flash",
  84                   offset: 0,
  85                   size: 128*1024*1024 }
  86 };
  87
  88 static struct mtd_partition partition_info_me[] = {
  89         { name: "PPChameleon ME Nand Flash",
  90                   offset: 0,
  91                   size: 32*1024*1024 }
  92 };
  93
  94 static struct mtd_partition partition_info_evb[] = {
  95         { name: "PPChameleonEVB Nand Flash",
  96                   offset: 0,
  97                   size: 32*1024*1024 }
  98 };
  99
 100 #define NUM_PARTITIONS 1
 101
 102 extern int parse_cmdline_partitions(struct mtd_info *master,
 103                                     struct mtd_partition **pparts,
 104                                     const char *mtd_id);
 105 #endif
 106
 107
 108 /*
 109  *      hardware specific access to control-lines
 110  */
 111 static void ppchameleon_hwcontrol(struct mtd_info *mtdinfo, int cmd)
 112 {
 113         switch(cmd) {
 114
 115         case NAND_CTL_SETCLE:
 116                 MACRO_NAND_CTL_SETCLE((unsigned long)CFG_NAND0_PADDR);
 117                 break;
 118         case NAND_CTL_CLRCLE:
 119                 MACRO_NAND_CTL_CLRCLE((unsigned long)CFG_NAND0_PADDR);
 120                 break;
 121         case NAND_CTL_SETALE:
 122                 MACRO_NAND_CTL_SETALE((unsigned long)CFG_NAND0_PADDR);
 123                 break;
 124         case NAND_CTL_CLRALE:
 125                 MACRO_NAND_CTL_CLRALE((unsigned long)CFG_NAND0_PADDR);
 126                 break;
 127         case NAND_CTL_SETNCE:
 128                         MACRO_NAND_ENABLE_CE((unsigned long)CFG_NAND0_PADDR);
 129                 break;
 130         case NAND_CTL_CLRNCE:
 131                         MACRO_NAND_DISABLE_CE((unsigned long)CFG_NAND0_PADDR);
 132                 break;
 133         }
 134 }
 135
 136 static void ppchameleonevb_hwcontrol(struct mtd_info *mtdinfo, int cmd)
 137 {
 138         switch(cmd) {
 139
 140         case NAND_CTL_SETCLE:
 141                 MACRO_NAND_CTL_SETCLE((unsigned long)CFG_NAND1_PADDR);
 142                 break;
 143         case NAND_CTL_CLRCLE:
 144                 MACRO_NAND_CTL_CLRCLE((unsigned long)CFG_NAND1_PADDR);
 145                 break;
 146         case NAND_CTL_SETALE:
 147                 MACRO_NAND_CTL_SETALE((unsigned long)CFG_NAND1_PADDR);
 148                 break;
 149         case NAND_CTL_CLRALE:
 150                 MACRO_NAND_CTL_CLRALE((unsigned long)CFG_NAND1_PADDR);
 151                 break;
 152         case NAND_CTL_SETNCE:
 153                 MACRO_NAND_ENABLE_CE((unsigned long)CFG_NAND1_PADDR);
 154                 break;
 155         case NAND_CTL_CLRNCE:
 156                 MACRO_NAND_DISABLE_CE((unsigned long)CFG_NAND1_PADDR);
 157                 break;
 158         }
 159 }
 160
 161 #ifdef USE_READY_BUSY_PIN
 162 /*
 163  *      read device ready pin
 164  */
 165 static int ppchameleon_device_ready(struct mtd_info *minfo)
 166 {
 167         if (in_be32((volatile unsigned*)GPIO0_IR) & NAND_RB_GPIO_PIN)
 168                 return 1;
 169         return 0;
 170 }
 171
 172 static int ppchameleonevb_device_ready(struct mtd_info *minfo)
 173 {
 174         if (in_be32((volatile unsigned*)GPIO0_IR) & NAND_EVB_RB_GPIO_PIN)
 175         return 1;
 176         return 0;
 177 }
 178 #endif
 179
 180 #ifdef CONFIG_MTD_PARTITIONS
 181 const char *part_probes[] = { "cmdlinepart", NULL };
 182 const char *part_probes_evb[] = { "cmdlinepart", NULL };
 183 #endif
 184
 185 /*
 186  * Main initialization routine
 187  */
 188 static int __init ppchameleonevb_init (void)
 189 {
 190         struct nand_chip *this;
 191         const char *part_type = 0;
 192         int mtd_parts_nb = 0;
 193         struct mtd_partition *mtd_parts = 0;
 194         void __iomem *ppchameleon_fio_base;
 195         void __iomem *ppchameleonevb_fio_base;
 196
 197
 198         /*********************************
 199         * Processor module NAND (if any) *
 200         *********************************/
 201         /* Allocate memory for MTD device structure and private data */
 202         ppchameleon_mtd = kmalloc(sizeof(struct mtd_info) +
 203                                                       sizeof(struct nand_chip), GFP_KERNEL);
 204         if (!ppchameleon_mtd) {
 205                 printk("Unable to allocate PPChameleon NAND MTD device structure.\n");
 206                 return -ENOMEM;
 207         }
 208
 209         /* map physical address */
 210         ppchameleon_fio_base = ioremap(ppchameleon_fio_pbase, SZ_4M);
 211         if(!ppchameleon_fio_base) {
 212                 printk("ioremap PPChameleon NAND flash failed\n");
 213                 kfree(ppchameleon_mtd);
 214                 return -EIO;
 215         }
 216
 217         /* Get pointer to private data */
 218         this = (struct nand_chip *) (&ppchameleon_mtd[1]);
 219
 220         /* Initialize structures */
 221         memset((char *) ppchameleon_mtd, 0, sizeof(struct mtd_info));
 222         memset((char *) this, 0, sizeof(struct nand_chip));
 223
 224         /* Link the private data with the MTD structure */
 225         ppchameleon_mtd->priv = this;
 226
 227         /* Initialize GPIOs */
 228         /* Pin mapping for NAND chip */
 229         /*
 230                 CE      GPIO_01
 231                 CLE     GPIO_02
 232                 ALE     GPIO_03
 233                 R/B     GPIO_04
 234         */
 235         /* output select */
 236         out_be32((volatile unsigned*)GPIO0_OSRH, in_be32((volatile unsigned*)GPIO0_OSRH) & 0xC0FFFFFF);
 237         /* three-state select */
 238         out_be32((volatile unsigned*)GPIO0_TSRH, in_be32((volatile unsigned*)GPIO0_TSRH) & 0xC0FFFFFF);
 239         /* enable output driver */
 240         out_be32((volatile unsigned*)GPIO0_TCR, in_be32((volatile unsigned*)GPIO0_TCR) | NAND_nCE_GPIO_PIN | NAND_CLE_GPIO_PIN | NAND_ALE_GPIO_PIN);
 241 #ifdef USE_READY_BUSY_PIN
 242         /* three-state select */
 243         out_be32((volatile unsigned*)GPIO0_TSRH, in_be32((volatile unsigned*)GPIO0_TSRH) & 0xFF3FFFFF);
 244         /* high-impedecence */
 245         out_be32((volatile unsigned*)GPIO0_TCR, in_be32((volatile unsigned*)GPIO0_TCR) & (~NAND_RB_GPIO_PIN));
 246         /* input select */
 247         out_be32((volatile unsigned*)GPIO0_ISR1H, (in_be32((volatile unsigned*)GPIO0_ISR1H) & 0xFF3FFFFF) | 0x00400000);
 248 #endif
 249
 250         /* insert callbacks */
 251         this->IO_ADDR_R = ppchameleon_fio_base;
 252         this->IO_ADDR_W = ppchameleon_fio_base;
 253         this->hwcontrol = ppchameleon_hwcontrol;
 254 #ifdef USE_READY_BUSY_PIN
 255         this->dev_ready = ppchameleon_device_ready;
 256 #endif
 257         this->chip_delay = NAND_BIG_DELAY_US;
 258         /* ECC mode */
 259         this->eccmode = NAND_ECC_SOFT;
 260
 261         /* Scan to find existence of the device (it could not be mounted) */
 262         if (nand_scan (ppchameleon_mtd, 1)) {
 263                 iounmap((void *)ppchameleon_fio_base);
 264                 kfree (ppchameleon_mtd);
 265                 goto nand_evb_init;
 266         }
 267
 268 #ifndef USE_READY_BUSY_PIN
 269         /* Adjust delay if necessary */
 270         if (ppchameleon_mtd->size == NAND_SMALL_SIZE)
 271                 this->chip_delay = NAND_SMALL_DELAY_US;
 272 #endif
 273
 274 #ifdef CONFIG_MTD_PARTITIONS
 275         ppchameleon_mtd->name = "ppchameleon-nand";
 276         mtd_parts_nb = parse_mtd_partitions(ppchameleon_mtd, part_probes, &mtd_parts, 0);
 277         if (mtd_parts_nb > 0)
 278           part_type = "command line";
 279         else
 280           mtd_parts_nb = 0;
 281 #endif
 282         if (mtd_parts_nb == 0)
 283         {
 284                 if (ppchameleon_mtd->size == NAND_SMALL_SIZE)
 285                         mtd_parts = partition_info_me;
 286                 else
 287                         mtd_parts = partition_info_hi;
 288                 mtd_parts_nb = NUM_PARTITIONS;
 289                 part_type = "static";
 290         }
 291
 292         /* Register the partitions */
 293         printk(KERN_NOTICE "Using %s partition definition\n", part_type);
 294         add_mtd_partitions(ppchameleon_mtd, mtd_parts, mtd_parts_nb);
 295
 296 nand_evb_init:
 297         /****************************
 298         * EVB NAND (always present) *
 299         ****************************/
 300         /* Allocate memory for MTD device structure and private data */
 301         ppchameleonevb_mtd = kmalloc(sizeof(struct mtd_info) +
 302                                                          sizeof(struct nand_chip), GFP_KERNEL);
 303         if (!ppchameleonevb_mtd) {
 304                 printk("Unable to allocate PPChameleonEVB NAND MTD device structure.\n");
 305                 return -ENOMEM;
 306         }
 307
 308         /* map physical address */
 309         ppchameleonevb_fio_base = ioremap(ppchameleonevb_fio_pbase, SZ_4M);
 310         if(!ppchameleonevb_fio_base) {
 311                 printk("ioremap PPChameleonEVB NAND flash failed\n");
 312                 kfree(ppchameleonevb_mtd);
 313                 return -EIO;
 314         }
 315
 316         /* Get pointer to private data */
 317         this = (struct nand_chip *) (&ppchameleonevb_mtd[1]);
 318
 319         /* Initialize structures */
 320         memset((char *) ppchameleonevb_mtd, 0, sizeof(struct mtd_info));
 321         memset((char *) this, 0, sizeof(struct nand_chip));
 322
 323         /* Link the private data with the MTD structure */
 324         ppchameleonevb_mtd->priv = this;
 325
 326         /* Initialize GPIOs */
 327         /* Pin mapping for NAND chip */
 328         /*
 329                 CE      GPIO_14
 330                 CLE     GPIO_15
 331                 ALE     GPIO_16
 332                 R/B     GPIO_31
 333         */
 334         /* output select */
 335         out_be32((volatile unsigned*)GPIO0_OSRH, in_be32((volatile unsigned*)GPIO0_OSRH) & 0xFFFFFFF0);
 336         out_be32((volatile unsigned*)GPIO0_OSRL, in_be32((volatile unsigned*)GPIO0_OSRL) & 0x3FFFFFFF);
 337         /* three-state select */
 338         out_be32((volatile unsigned*)GPIO0_TSRH, in_be32((volatile unsigned*)GPIO0_TSRH) & 0xFFFFFFF0);
 339         out_be32((volatile unsigned*)GPIO0_TSRL, in_be32((volatile unsigned*)GPIO0_TSRL) & 0x3FFFFFFF);
 340         /* enable output driver */
 341         out_be32((volatile unsigned*)GPIO0_TCR, in_be32((volatile unsigned*)GPIO0_TCR) | NAND_EVB_nCE_GPIO_PIN |
 342                  NAND_EVB_CLE_GPIO_PIN | NAND_EVB_ALE_GPIO_PIN);
 343 #ifdef USE_READY_BUSY_PIN
 344         /* three-state select */
 345         out_be32((volatile unsigned*)GPIO0_TSRL, in_be32((volatile unsigned*)GPIO0_TSRL) & 0xFFFFFFFC);
 346         /* high-impedecence */
 347         out_be32((volatile unsigned*)GPIO0_TCR, in_be32((volatile unsigned*)GPIO0_TCR) & (~NAND_EVB_RB_GPIO_PIN));
 348         /* input select */
 349         out_be32((volatile unsigned*)GPIO0_ISR1L, (in_be32((volatile unsigned*)GPIO0_ISR1L) & 0xFFFFFFFC) | 0x00000001);
 350 #endif
 351
 352         /* insert callbacks */
 353         this->IO_ADDR_R = ppchameleonevb_fio_base;
 354         this->IO_ADDR_W = ppchameleonevb_fio_base;
 355         this->hwcontrol = ppchameleonevb_hwcontrol;
 356 #ifdef USE_READY_BUSY_PIN
 357         this->dev_ready = ppchameleonevb_device_ready;
 358 #endif
 359         this->chip_delay = NAND_SMALL_DELAY_US;
 360
 361         /* ECC mode */
 362         this->eccmode = NAND_ECC_SOFT;
 363
 364         /* Scan to find existence of the device */
 365         if (nand_scan (ppchameleonevb_mtd, 1)) {
 366                 iounmap((void *)ppchameleonevb_fio_base);
 367                 kfree (ppchameleonevb_mtd);
 368                 return -ENXIO;
 369         }
 370
 371 #ifdef CONFIG_MTD_PARTITIONS
 372         ppchameleonevb_mtd->name = NAND_EVB_MTD_NAME;
 373         mtd_parts_nb = parse_mtd_partitions(ppchameleonevb_mtd, part_probes_evb, &mtd_parts, 0);
 374         if (mtd_parts_nb > 0)
 375           part_type = "command line";
 376         else
 377           mtd_parts_nb = 0;
 378 #endif
 379         if (mtd_parts_nb == 0)
 380         {
 381                 mtd_parts = partition_info_evb;
 382                 mtd_parts_nb = NUM_PARTITIONS;
 383                 part_type = "static";
 384         }
 385
 386         /* Register the partitions */
 387         printk(KERN_NOTICE "Using %s partition definition\n", part_type);
 388         add_mtd_partitions(ppchameleonevb_mtd, mtd_parts, mtd_parts_nb);
 389
 390         /* Return happy */
 391         return 0;
 392 }
 393 module_init(ppchameleonevb_init);
 394
 395 /*
 396  * Clean up routine
 397  */
 398 static void __exit ppchameleonevb_cleanup (void)
 399 {
 400         struct nand_chip *this;
 401
 402         /* Release resources, unregister device(s) */
 403         nand_release (ppchameleon_mtd);
 404         nand_release (ppchameleonevb_mtd);
 405
 406         /* Release iomaps */
 407         this = (struct nand_chip *) &ppchameleon_mtd[1];
 408         iounmap((void *) this->IO_ADDR_R;
 409         this = (struct nand_chip *) &ppchameleonevb_mtd[1];
 410         iounmap((void *) this->IO_ADDR_R;
 411
 412         /* Free the MTD device structure */
 413         kfree (ppchameleon_mtd);
 414         kfree (ppchameleonevb_mtd);
 415 }
 416 module_exit(ppchameleonevb_cleanup);
 417
 418 MODULE_LICENSE("GPL");
 419 MODULE_AUTHOR("DAVE Srl <support-ppchameleon@dave-tech.it>");
 420 MODULE_DESCRIPTION("MTD map driver for DAVE Srl PPChameleonEVB board");