drivers/mtd/maps/pci.c

   1 /*
   2  *  linux/drivers/mtd/maps/pci.c
   3  *
   4  *  Copyright (C) 2001 Russell King, All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * Generic PCI memory map driver.  We support the following boards:
  11  *  - Intel IQ80310 ATU.
  12  *  - Intel EBSA285 (blank rom programming mode). Tested working 27/09/2001
  13  */
  14 #include <linux/module.h>
  15 #include <linux/kernel.h>
  16 #include <linux/pci.h>
  17 #include <linux/init.h>
  18 #include <linux/slab.h>
  19
  20 #include <linux/mtd/mtd.h>
  21 #include <linux/mtd/map.h>
  22 #include <linux/mtd/partitions.h>
  23
  24 struct map_pci_info;
  25
  26 struct mtd_pci_info {
  27         int  (*init)(struct pci_dev *dev, struct map_pci_info *map);
  28         void (*exit)(struct pci_dev *dev, struct map_pci_info *map);
  29         unsigned long (*translate)(struct map_pci_info *map, unsigned long ofs);
  30         const char *map_name;
  31 };
  32
  33 struct map_pci_info {
  34         struct map_info map;
  35         void __iomem *base;
  36         void (*exit)(struct pci_dev *dev, struct map_pci_info *map);
  37         unsigned long (*translate)(struct map_pci_info *map, unsigned long ofs);
  38         struct pci_dev *dev;
  39 };
  40
  41 static map_word mtd_pci_read8(struct map_info *_map, unsigned long ofs)
  42 {
  43         struct map_pci_info *map = (struct map_pci_info *)_map;
  44         map_word val;
  45         val.x[0]= readb(map->base + map->translate(map, ofs));
  46 //      printk("read8 : %08lx => %02x\n", ofs, val.x[0]);
  47         return val;
  48 }
  49
  50 #if 0
  51 static map_word mtd_pci_read16(struct map_info *_map, unsigned long ofs)
  52 {
  53         struct map_pci_info *map = (struct map_pci_info *)_map;
  54         map_word val;
  55         val.x[0] = readw(map->base + map->translate(map, ofs));
  56 //      printk("read16: %08lx => %04x\n", ofs, val.x[0]);
  57         return val;
  58 }
  59 #endif
  60 static map_word mtd_pci_read32(struct map_info *_map, unsigned long ofs)
  61 {
  62         struct map_pci_info *map = (struct map_pci_info *)_map;
  63         map_word val;
  64         val.x[0] = readl(map->base + map->translate(map, ofs));
  65 //      printk("read32: %08lx => %08x\n", ofs, val.x[0]);
  66         return val;
  67 }
  68
  69 static void mtd_pci_copyfrom(struct map_info *_map, void *to, unsigned long from, ssize_t len)
  70 {
  71         struct map_pci_info *map = (struct map_pci_info *)_map;
  72         memcpy_fromio(to, map->base + map->translate(map, from), len);
  73 }
  74
  75 static void mtd_pci_write8(struct map_info *_map, map_word val, unsigned long ofs)
  76 {
  77         struct map_pci_info *map = (struct map_pci_info *)_map;
  78 //      printk("write8 : %08lx <= %02x\n", ofs, val.x[0]);
  79         writeb(val.x[0], map->base + map->translate(map, ofs));
  80 }
  81
  82 #if 0
  83 static void mtd_pci_write16(struct map_info *_map, map_word val, unsigned long ofs)
  84 {
  85         struct map_pci_info *map = (struct map_pci_info *)_map;
  86 //      printk("write16: %08lx <= %04x\n", ofs, val.x[0]);
  87         writew(val.x[0], map->base + map->translate(map, ofs));
  88 }
  89 #endif
  90 static void mtd_pci_write32(struct map_info *_map, map_word val, unsigned long ofs)
  91 {
  92         struct map_pci_info *map = (struct map_pci_info *)_map;
  93 //      printk("write32: %08lx <= %08x\n", ofs, val.x[0]);
  94         writel(val.x[0], map->base + map->translate(map, ofs));
  95 }
  96
  97 static void mtd_pci_copyto(struct map_info *_map, unsigned long to, const void *from, ssize_t len)
  98 {
  99         struct map_pci_info *map = (struct map_pci_info *)_map;
 100         memcpy_toio(map->base + map->translate(map, to), from, len);
 101 }
 102
 103 static const struct map_info mtd_pci_map = {
 104         .phys =         NO_XIP,
 105         .copy_from =    mtd_pci_copyfrom,
 106         .copy_to =      mtd_pci_copyto,
 107 };
 108
 109 /*
 110  * Intel IOP80310 Flash driver
 111  */
 112
 113 static int
 114 intel_iq80310_init(struct pci_dev *dev, struct map_pci_info *map)
 115 {
 116         u32 win_base;
 117
 118         map->map.bankwidth = 1;
 119         map->map.read = mtd_pci_read8,
 120         map->map.write = mtd_pci_write8,
 121
 122         map->map.size     = 0x00800000;
 123         map->base         = ioremap_nocache(pci_resource_start(dev, 0),
 124                                             pci_resource_len(dev, 0));
 125
 126         if (!map->base)
 127                 return -ENOMEM;
 128
 129         /*
 130          * We want to base the memory window at Xscale
 131          * bus address 0, not 0x1000.
 132          */
 133         pci_read_config_dword(dev, 0x44, &win_base);
 134         pci_write_config_dword(dev, 0x44, 0);
 135
 136         map->map.map_priv_2 = win_base;
 137
 138         return 0;
 139 }
 140
 141 static void
 142 intel_iq80310_exit(struct pci_dev *dev, struct map_pci_info *map)
 143 {
 144         if (map->base)
 145                 iounmap(map->base);
 146         pci_write_config_dword(dev, 0x44, map->map.map_priv_2);
 147 }
 148
 149 static unsigned long
 150 intel_iq80310_translate(struct map_pci_info *map, unsigned long ofs)
 151 {
 152         unsigned long page_addr = ofs & 0x00400000;
 153
 154         /*
 155          * This mundges the flash location so we avoid
 156          * the first 80 bytes (they appear to read nonsense).
 157          */
 158         if (page_addr) {
 159                 writel(0x00000008, map->base + 0x1558);
 160                 writel(0x00000000, map->base + 0x1550);
 161         } else {
 162                 writel(0x00000007, map->base + 0x1558);
 163                 writel(0x00800000, map->base + 0x1550);
 164                 ofs += 0x00800000;
 165         }
 166
 167         return ofs;
 168 }
 169
 170 static struct mtd_pci_info intel_iq80310_info = {
 171         .init =         intel_iq80310_init,
 172         .exit =         intel_iq80310_exit,
 173         .translate =    intel_iq80310_translate,
 174         .map_name =     "cfi_probe",
 175 };
 176
 177 /*
 178  * Intel DC21285 driver
 179  */
 180
 181 static int
 182 intel_dc21285_init(struct pci_dev *dev, struct map_pci_info *map)
 183 {
 184         unsigned long base, len;
 185
 186         base = pci_resource_start(dev, PCI_ROM_RESOURCE);
 187         len  = pci_resource_len(dev, PCI_ROM_RESOURCE);
 188
 189         if (!len || !base) {
 190                 /*
 191                  * No ROM resource
 192                  */
 193                 base = pci_resource_start(dev, 2);
 194                 len  = pci_resource_len(dev, 2);
 195
 196                 /*
 197                  * We need to re-allocate PCI BAR2 address range to the
 198                  * PCI ROM BAR, and disable PCI BAR2.
 199                  */
 200         } else {
 201                 /*
 202                  * Hmm, if an address was allocated to the ROM resource, but
 203                  * not enabled, should we be allocating a new resource for it
 204                  * or simply enabling it?
 205                  */
 206                 pci_enable_rom(dev);
 207                 printk("%s: enabling expansion ROM\n", pci_name(dev));
 208         }
 209
 210         if (!len || !base)
 211                 return -ENXIO;
 212
 213         map->map.bankwidth = 4;
 214         map->map.read = mtd_pci_read32,
 215         map->map.write = mtd_pci_write32,
 216         map->map.size     = len;
 217         map->base         = ioremap_nocache(base, len);
 218
 219         if (!map->base)
 220                 return -ENOMEM;
 221
 222         return 0;
 223 }
 224
 225 static void
 226 intel_dc21285_exit(struct pci_dev *dev, struct map_pci_info *map)
 227 {
 228         if (map->base)
 229                 iounmap(map->base);
 230
 231         /*
 232          * We need to undo the PCI BAR2/PCI ROM BAR address alteration.
 233          */
 234         pci_disable_rom(dev);
 235 }
 236
 237 static unsigned long
 238 intel_dc21285_translate(struct map_pci_info *map, unsigned long ofs)
 239 {
 240         return ofs & 0x00ffffc0 ? ofs : (ofs ^ (1 << 5));
 241 }
 242
 243 static struct mtd_pci_info intel_dc21285_info = {
 244         .init =         intel_dc21285_init,
 245         .exit =         intel_dc21285_exit,
 246         .translate =    intel_dc21285_translate,
 247         .map_name =     "jedec_probe",
 248 };
 249
 250 /*
 251  * PCI device ID table
 252  */
 253
 254 static struct pci_device_id mtd_pci_ids[] = {
 255         {
 256                 .vendor =       PCI_VENDOR_ID_INTEL,
 257                 .device =       0x530d,
 258                 .subvendor =    PCI_ANY_ID,
 259                 .subdevice =    PCI_ANY_ID,
 260                 .class =        PCI_CLASS_MEMORY_OTHER << 8,
 261                 .class_mask =   0xffff00,
 262                 .driver_data =  (unsigned long)&intel_iq80310_info,
 263         },
 264         {
 265                 .vendor =       PCI_VENDOR_ID_DEC,
 266                 .device =       PCI_DEVICE_ID_DEC_21285,
 267                 .subvendor =    0,      /* DC21285 defaults to 0 on reset */
 268                 .subdevice =    0,      /* DC21285 defaults to 0 on reset */
 269                 .driver_data =  (unsigned long)&intel_dc21285_info,
 270         },
 271         { 0, }
 272 };
 273
 274 /*
 275  * Generic code follows.
 276  */
 277
 278 static int __devinit
 279 mtd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id)
 280 {
 281         struct mtd_pci_info *info = (struct mtd_pci_info *)id->driver_data;
 282         struct map_pci_info *map = NULL;
 283         struct mtd_info *mtd = NULL;
 284         int err;
 285
 286         err = pci_enable_device(dev);
 287         if (err)
 288                 goto out;
 289
 290         err = pci_request_regions(dev, "pci mtd");
 291         if (err)
 292                 goto out;
 293
 294         map = kmalloc(sizeof(*map), GFP_KERNEL);
 295         err = -ENOMEM;
 296         if (!map)
 297                 goto release;
 298
 299         map->map       = mtd_pci_map;
 300         map->map.name  = pci_name(dev);
 301         map->dev       = dev;
 302         map->exit      = info->exit;
 303         map->translate = info->translate;
 304
 305         err = info->init(dev, map);
 306         if (err)
 307                 goto release;
 308
 309         /* tsk - do_map_probe should take const char * */
 310         mtd = do_map_probe((char *)info->map_name, &map->map);
 311         err = -ENODEV;
 312         if (!mtd)
 313                 goto release;
 314
 315         mtd->owner = THIS_MODULE;
 316         add_mtd_device(mtd);
 317
 318         pci_set_drvdata(dev, mtd);
 319
 320         return 0;
 321
 322 release:
 323         if (map) {
 324                 map->exit(dev, map);
 325                 kfree(map);
 326         }
 327
 328         pci_release_regions(dev);
 329 out:
 330         return err;
 331 }
 332
 333 static void __devexit
 334 mtd_pci_remove(struct pci_dev *dev)
 335 {
 336         struct mtd_info *mtd = pci_get_drvdata(dev);
 337         struct map_pci_info *map = mtd->priv;
 338
 339         del_mtd_device(mtd);
 340         map_destroy(mtd);
 341         map->exit(dev, map);
 342         kfree(map);
 343
 344         pci_set_drvdata(dev, NULL);
 345         pci_release_regions(dev);
 346 }
 347
 348 static struct pci_driver mtd_pci_driver = {
 349         .name =         "MTD PCI",
 350         .probe =        mtd_pci_probe,
 351         .remove =       __devexit_p(mtd_pci_remove),
 352         .id_table =     mtd_pci_ids,
 353 };
 354
 355 static int __init mtd_pci_maps_init(void)
 356 {
 357         return pci_register_driver(&mtd_pci_driver);
 358 }
 359
 360 static void __exit mtd_pci_maps_exit(void)
 361 {
 362         pci_unregister_driver(&mtd_pci_driver);
 363 }
 364
 365 module_init(mtd_pci_maps_init);
 366 module_exit(mtd_pci_maps_exit);
 367
 368 MODULE_LICENSE("GPL");
 369 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>");
 370 MODULE_DESCRIPTION("Generic PCI map driver");
 371 MODULE_DEVICE_TABLE(pci, mtd_pci_ids);
 372