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 return val; 47 } 48 49 static map_word mtd_pci_read32(struct map_info *_map, unsigned long ofs) 50 { 51 struct map_pci_info *map = (struct map_pci_info *)_map; 52 map_word val; 53 val.x[0] = readl(map->base + map->translate(map, ofs)); 54 return val; 55 } 56 57 static void mtd_pci_copyfrom(struct map_info *_map, void *to, unsigned long from, ssize_t len) 58 { 59 struct map_pci_info *map = (struct map_pci_info *)_map; 60 memcpy_fromio(to, map->base + map->translate(map, from), len); 61 } 62 63 static void mtd_pci_write8(struct map_info *_map, map_word val, unsigned long ofs) 64 { 65 struct map_pci_info *map = (struct map_pci_info *)_map; 66 writeb(val.x[0], map->base + map->translate(map, ofs)); 67 } 68 69 static void mtd_pci_write32(struct map_info *_map, map_word val, unsigned long ofs) 70 { 71 struct map_pci_info *map = (struct map_pci_info *)_map; 72 writel(val.x[0], map->base + map->translate(map, ofs)); 73 } 74 75 static void mtd_pci_copyto(struct map_info *_map, unsigned long to, const void *from, ssize_t len) 76 { 77 struct map_pci_info *map = (struct map_pci_info *)_map; 78 memcpy_toio(map->base + map->translate(map, to), from, len); 79 } 80 81 static const struct map_info mtd_pci_map = { 82 .phys = NO_XIP, 83 .copy_from = mtd_pci_copyfrom, 84 .copy_to = mtd_pci_copyto, 85 }; 86 87 /* 88 * Intel IOP80310 Flash driver 89 */ 90 91 static int 92 intel_iq80310_init(struct pci_dev *dev, struct map_pci_info *map) 93 { 94 u32 win_base; 95 96 map->map.bankwidth = 1; 97 map->map.read = mtd_pci_read8, 98 map->map.write = mtd_pci_write8, 99 100 map->map.size = 0x00800000; 101 map->base = ioremap_nocache(pci_resource_start(dev, 0), 102 pci_resource_len(dev, 0)); 103 104 if (!map->base) 105 return -ENOMEM; 106 107 /* 108 * We want to base the memory window at Xscale 109 * bus address 0, not 0x1000. 110 */ 111 pci_read_config_dword(dev, 0x44, &win_base); 112 pci_write_config_dword(dev, 0x44, 0); 113 114 map->map.map_priv_2 = win_base; 115 116 return 0; 117 } 118 119 static void 120 intel_iq80310_exit(struct pci_dev *dev, struct map_pci_info *map) 121 { 122 if (map->base) 123 iounmap(map->base); 124 pci_write_config_dword(dev, 0x44, map->map.map_priv_2); 125 } 126 127 static unsigned long 128 intel_iq80310_translate(struct map_pci_info *map, unsigned long ofs) 129 { 130 unsigned long page_addr = ofs & 0x00400000; 131 132 /* 133 * This mundges the flash location so we avoid 134 * the first 80 bytes (they appear to read nonsense). 135 */ 136 if (page_addr) { 137 writel(0x00000008, map->base + 0x1558); 138 writel(0x00000000, map->base + 0x1550); 139 } else { 140 writel(0x00000007, map->base + 0x1558); 141 writel(0x00800000, map->base + 0x1550); 142 ofs += 0x00800000; 143 } 144 145 return ofs; 146 } 147 148 static struct mtd_pci_info intel_iq80310_info = { 149 .init = intel_iq80310_init, 150 .exit = intel_iq80310_exit, 151 .translate = intel_iq80310_translate, 152 .map_name = "cfi_probe", 153 }; 154 155 /* 156 * Intel DC21285 driver 157 */ 158 159 static int 160 intel_dc21285_init(struct pci_dev *dev, struct map_pci_info *map) 161 { 162 unsigned long base, len; 163 164 base = pci_resource_start(dev, PCI_ROM_RESOURCE); 165 len = pci_resource_len(dev, PCI_ROM_RESOURCE); 166 167 if (!len || !base) { 168 /* 169 * No ROM resource 170 */ 171 base = pci_resource_start(dev, 2); 172 len = pci_resource_len(dev, 2); 173 174 /* 175 * We need to re-allocate PCI BAR2 address range to the 176 * PCI ROM BAR, and disable PCI BAR2. 177 */ 178 } else { 179 /* 180 * Hmm, if an address was allocated to the ROM resource, but 181 * not enabled, should we be allocating a new resource for it 182 * or simply enabling it? 183 */ 184 pci_enable_rom(dev); 185 printk("%s: enabling expansion ROM\n", pci_name(dev)); 186 } 187 188 if (!len || !base) 189 return -ENXIO; 190 191 map->map.bankwidth = 4; 192 map->map.read = mtd_pci_read32, 193 map->map.write = mtd_pci_write32, 194 map->map.size = len; 195 map->base = ioremap_nocache(base, len); 196 197 if (!map->base) 198 return -ENOMEM; 199 200 return 0; 201 } 202 203 static void 204 intel_dc21285_exit(struct pci_dev *dev, struct map_pci_info *map) 205 { 206 if (map->base) 207 iounmap(map->base); 208 209 /* 210 * We need to undo the PCI BAR2/PCI ROM BAR address alteration. 211 */ 212 pci_disable_rom(dev); 213 } 214 215 static unsigned long 216 intel_dc21285_translate(struct map_pci_info *map, unsigned long ofs) 217 { 218 return ofs & 0x00ffffc0 ? ofs : (ofs ^ (1 << 5)); 219 } 220 221 static struct mtd_pci_info intel_dc21285_info = { 222 .init = intel_dc21285_init, 223 .exit = intel_dc21285_exit, 224 .translate = intel_dc21285_translate, 225 .map_name = "jedec_probe", 226 }; 227 228 /* 229 * PCI device ID table 230 */ 231 232 static struct pci_device_id mtd_pci_ids[] = { 233 { 234 .vendor = PCI_VENDOR_ID_INTEL, 235 .device = 0x530d, 236 .subvendor = PCI_ANY_ID, 237 .subdevice = PCI_ANY_ID, 238 .class = PCI_CLASS_MEMORY_OTHER << 8, 239 .class_mask = 0xffff00, 240 .driver_data = (unsigned long)&intel_iq80310_info, 241 }, 242 { 243 .vendor = PCI_VENDOR_ID_DEC, 244 .device = PCI_DEVICE_ID_DEC_21285, 245 .subvendor = 0, /* DC21285 defaults to 0 on reset */ 246 .subdevice = 0, /* DC21285 defaults to 0 on reset */ 247 .driver_data = (unsigned long)&intel_dc21285_info, 248 }, 249 { 0, } 250 }; 251 252 /* 253 * Generic code follows. 254 */ 255 256 static int mtd_pci_probe(struct pci_dev *dev, const struct pci_device_id *id) 257 { 258 struct mtd_pci_info *info = (struct mtd_pci_info *)id->driver_data; 259 struct map_pci_info *map = NULL; 260 struct mtd_info *mtd = NULL; 261 int err; 262 263 err = pci_enable_device(dev); 264 if (err) 265 goto out; 266 267 err = pci_request_regions(dev, "pci mtd"); 268 if (err) 269 goto out; 270 271 map = kmalloc(sizeof(*map), GFP_KERNEL); 272 err = -ENOMEM; 273 if (!map) 274 goto release; 275 276 map->map = mtd_pci_map; 277 map->map.name = pci_name(dev); 278 map->dev = dev; 279 map->exit = info->exit; 280 map->translate = info->translate; 281 282 err = info->init(dev, map); 283 if (err) 284 goto release; 285 286 mtd = do_map_probe(info->map_name, &map->map); 287 err = -ENODEV; 288 if (!mtd) 289 goto release; 290 291 mtd->owner = THIS_MODULE; 292 mtd_device_register(mtd, NULL, 0); 293 294 pci_set_drvdata(dev, mtd); 295 296 return 0; 297 298 release: 299 if (map) { 300 map->exit(dev, map); 301 kfree(map); 302 } 303 304 pci_release_regions(dev); 305 out: 306 return err; 307 } 308 309 static void mtd_pci_remove(struct pci_dev *dev) 310 { 311 struct mtd_info *mtd = pci_get_drvdata(dev); 312 struct map_pci_info *map = mtd->priv; 313 314 mtd_device_unregister(mtd); 315 map_destroy(mtd); 316 map->exit(dev, map); 317 kfree(map); 318 319 pci_set_drvdata(dev, NULL); 320 pci_release_regions(dev); 321 } 322 323 static struct pci_driver mtd_pci_driver = { 324 .name = "MTD PCI", 325 .probe = mtd_pci_probe, 326 .remove = mtd_pci_remove, 327 .id_table = mtd_pci_ids, 328 }; 329 330 module_pci_driver(mtd_pci_driver); 331 332 MODULE_LICENSE("GPL"); 333 MODULE_AUTHOR("Russell King <rmk@arm.linux.org.uk>"); 334 MODULE_DESCRIPTION("Generic PCI map driver"); 335 MODULE_DEVICE_TABLE(pci, mtd_pci_ids); 336