arch/ppc/syslib/ppc_sys.c

   1 /*
   2  * PPC System library functions
   3  *
   4  * Maintainer: Kumar Gala <galak@kernel.crashing.org>
   5  *
   6  * Copyright 2005 Freescale Semiconductor Inc.
   7  * Copyright 2005 MontaVista, Inc. by Vitaly Bordug <vbordug@ru.mvista.com>
   8  *
   9  * This program is free software; you can redistribute  it and/or modify it
  10  * under  the terms of  the GNU General  Public License as published by the
  11  * Free Software Foundation;  either version 2 of the  License, or (at your
  12  * option) any later version.
  13  */
  14
  15 #include <linux/string.h>
  16 #include <linux/bootmem.h>
  17 #include <asm/ppc_sys.h>
  18
  19 int (*ppc_sys_device_fixup) (struct platform_device * pdev);
  20
  21 static int ppc_sys_inited;
  22 static int ppc_sys_func_inited;
  23
  24 static const char *ppc_sys_func_names[] = {
  25         [PPC_SYS_FUNC_DUMMY] = "dummy",
  26         [PPC_SYS_FUNC_ETH] = "eth",
  27         [PPC_SYS_FUNC_UART] = "uart",
  28         [PPC_SYS_FUNC_HLDC] = "hldc",
  29         [PPC_SYS_FUNC_USB] = "usb",
  30         [PPC_SYS_FUNC_IRDA] = "irda",
  31 };
  32
  33 void __init identify_ppc_sys_by_id(u32 id)
  34 {
  35         unsigned int i = 0;
  36         while (1) {
  37                 if ((ppc_sys_specs[i].mask & id) == ppc_sys_specs[i].value)
  38                         break;
  39                 i++;
  40         }
  41
  42         cur_ppc_sys_spec = &ppc_sys_specs[i];
  43
  44         return;
  45 }
  46
  47 void __init identify_ppc_sys_by_name(char *name)
  48 {
  49         unsigned int i = 0;
  50         while (ppc_sys_specs[i].ppc_sys_name[0]) {
  51                 if (!strcmp(ppc_sys_specs[i].ppc_sys_name, name))
  52                         break;
  53                 i++;
  54         }
  55         cur_ppc_sys_spec = &ppc_sys_specs[i];
  56
  57         return;
  58 }
  59
  60 static int __init count_sys_specs(void)
  61 {
  62         int i = 0;
  63         while (ppc_sys_specs[i].ppc_sys_name[0])
  64                 i++;
  65         return i;
  66 }
  67
  68 static int __init find_chip_by_name_and_id(char *name, u32 id)
  69 {
  70         int ret = -1;
  71         unsigned int i = 0;
  72         unsigned int j = 0;
  73         unsigned int dups = 0;
  74
  75         unsigned char matched[count_sys_specs()];
  76
  77         while (ppc_sys_specs[i].ppc_sys_name[0]) {
  78                 if (!strcmp(ppc_sys_specs[i].ppc_sys_name, name))
  79                         matched[j++] = i;
  80                 i++;
  81         }
  82
  83         ret = i;
  84
  85         if (j != 0) {
  86                 for (i = 0; i < j; i++) {
  87                         if ((ppc_sys_specs[matched[i]].mask & id) ==
  88                             ppc_sys_specs[matched[i]].value) {
  89                                 ret = matched[i];
  90                                 dups++;
  91                         }
  92                 }
  93                 ret = (dups == 1) ? ret : (-1 * dups);
  94         }
  95         return ret;
  96 }
  97
  98 void __init identify_ppc_sys_by_name_and_id(char *name, u32 id)
  99 {
 100         int i = find_chip_by_name_and_id(name, id);
 101         BUG_ON(i < 0);
 102         cur_ppc_sys_spec = &ppc_sys_specs[i];
 103 }
 104
 105 /* Update all memory resources by paddr, call before platform_device_register */
 106 void __init
 107 ppc_sys_fixup_mem_resource(struct platform_device *pdev, phys_addr_t paddr)
 108 {
 109         int i;
 110         for (i = 0; i < pdev->num_resources; i++) {
 111                 struct resource *r = &pdev->resource[i];
 112                 if ((r->flags & IORESOURCE_MEM) == IORESOURCE_MEM) {
 113                         r->start += paddr;
 114                         r->end += paddr;
 115                 }
 116         }
 117 }
 118
 119 /* Get platform_data pointer out of platform device, call before platform_device_register */
 120 void *__init ppc_sys_get_pdata(enum ppc_sys_devices dev)
 121 {
 122         return ppc_sys_platform_devices[dev].dev.platform_data;
 123 }
 124
 125 void ppc_sys_device_remove(enum ppc_sys_devices dev)
 126 {
 127         unsigned int i;
 128
 129         if (ppc_sys_inited) {
 130                 platform_device_unregister(&ppc_sys_platform_devices[dev]);
 131         } else {
 132                 if (cur_ppc_sys_spec == NULL)
 133                         return;
 134                 for (i = 0; i < cur_ppc_sys_spec->num_devices; i++)
 135                         if (cur_ppc_sys_spec->device_list[i] == dev)
 136                                 cur_ppc_sys_spec->device_list[i] = -1;
 137         }
 138 }
 139
 140 /* Platform-notify mapping
 141  * Helper function for BSP code to assign board-specific platfom-divice bits
 142  */
 143
 144 void platform_notify_map(const struct platform_notify_dev_map *map,
 145                          struct device *dev)
 146 {
 147         struct platform_device *pdev;
 148         int len, idx;
 149         const char *s;
 150
 151         /* do nothing if no device or no bus_id */
 152         if (!dev || !dev->bus_id)
 153                 return;
 154
 155         /* call per device map */
 156         while (map->bus_id != NULL) {
 157                 idx = -1;
 158                 s = strrchr(dev->bus_id, '.');
 159                 if (s != NULL)
 160                         idx = (int)simple_strtol(s + 1, NULL, 10);
 161                 else
 162                         s = dev->bus_id;
 163
 164                 len = s - dev->bus_id;
 165
 166                 if (!strncmp(dev->bus_id, map->bus_id, len)) {
 167                         pdev = container_of(dev, struct platform_device, dev);
 168                         map->rtn(pdev, idx);
 169                 }
 170                 map++;
 171         }
 172 }
 173
 174 /*
 175    Function assignment stuff.
 176  Intended to work as follows:
 177  the device name defined in foo_devices.c will be concatenated with :"func",
 178  where func is string map of respective function from platfom_device_func enum
 179
 180  The PPC_SYS_FUNC_DUMMY function is intended to remove all assignments, making the device to appear
 181  in platform bus with unmodified name.
 182  */
 183
 184 /*
 185    Here we'll replace .name pointers with fixed-lenght strings
 186    Hereby, this should be called *before* any func stuff triggeded.
 187  */
 188 void ppc_sys_device_initfunc(void)
 189 {
 190         int i;
 191         const char *name;
 192         static char new_names[NUM_PPC_SYS_DEVS][BUS_ID_SIZE];
 193         enum ppc_sys_devices cur_dev;
 194
 195         /* If inited yet, do nothing */
 196         if (ppc_sys_func_inited)
 197                 return;
 198
 199         for (i = 0; i < cur_ppc_sys_spec->num_devices; i++) {
 200                 if ((cur_dev = cur_ppc_sys_spec->device_list[i]) < 0)
 201                         continue;
 202
 203                 if (ppc_sys_platform_devices[cur_dev].name) {
 204                         /*backup name */
 205                         name = ppc_sys_platform_devices[cur_dev].name;
 206                         strlcpy(new_names[i], name, BUS_ID_SIZE);
 207                         ppc_sys_platform_devices[cur_dev].name = new_names[i];
 208                 }
 209         }
 210
 211         ppc_sys_func_inited = 1;
 212 }
 213
 214 /*The "engine" of the func stuff. Here we either concat specified function string description
 215  to the name, or remove it if PPC_SYS_FUNC_DUMMY parameter is passed here*/
 216 void ppc_sys_device_setfunc(enum ppc_sys_devices dev,
 217                             enum platform_device_func func)
 218 {
 219         char *s;
 220         char *name = (char *)ppc_sys_platform_devices[dev].name;
 221         char tmp[BUS_ID_SIZE];
 222
 223         if (!ppc_sys_func_inited) {
 224                 printk(KERN_ERR "Unable to alter function - not inited!\n");
 225                 return;
 226         }
 227
 228         if (ppc_sys_inited) {
 229                 platform_device_unregister(&ppc_sys_platform_devices[dev]);
 230         }
 231
 232         if ((s = (char *)strchr(name, ':')) != NULL) {  /* reassign */
 233                 /* Either change the name after ':' or remove func modifications */
 234                 if (func != PPC_SYS_FUNC_DUMMY)
 235                         strlcpy(s + 1, ppc_sys_func_names[func], BUS_ID_SIZE);
 236                 else
 237                         *s = 0;
 238         } else if (func != PPC_SYS_FUNC_DUMMY) {
 239                 /* do assignment if it is not just "clear"  request */
 240                 sprintf(tmp, "%s:%s", name, ppc_sys_func_names[func]);
 241                 strlcpy(name, tmp, BUS_ID_SIZE);
 242         }
 243
 244         if (ppc_sys_inited) {
 245                 platform_device_register(&ppc_sys_platform_devices[dev]);
 246         }
 247 }
 248
 249 void ppc_sys_device_disable(enum ppc_sys_devices dev)
 250 {
 251         BUG_ON(cur_ppc_sys_spec == NULL);
 252
 253         /*Check if it is enabled*/
 254         if(!(cur_ppc_sys_spec->config[dev] & PPC_SYS_CONFIG_DISABLED)) {
 255                 if (ppc_sys_inited) {
 256                         platform_device_unregister(&ppc_sys_platform_devices[dev]);
 257                 }
 258                 cur_ppc_sys_spec->config[dev] |= PPC_SYS_CONFIG_DISABLED;
 259         }
 260 }
 261
 262 void ppc_sys_device_enable(enum ppc_sys_devices dev)
 263 {
 264         BUG_ON(cur_ppc_sys_spec == NULL);
 265
 266         /*Check if it is disabled*/
 267         if(cur_ppc_sys_spec->config[dev] & PPC_SYS_CONFIG_DISABLED) {
 268                 if (ppc_sys_inited) {
 269                         platform_device_register(&ppc_sys_platform_devices[dev]);
 270                 }
 271                 cur_ppc_sys_spec->config[dev] &= ~PPC_SYS_CONFIG_DISABLED;
 272         }
 273
 274 }
 275
 276 void ppc_sys_device_enable_all(void)
 277 {
 278         enum ppc_sys_devices cur_dev;
 279         int i;
 280
 281         for (i = 0; i < cur_ppc_sys_spec->num_devices; i++) {
 282                 cur_dev = cur_ppc_sys_spec->device_list[i];
 283                 ppc_sys_device_enable(cur_dev);
 284         }
 285 }
 286
 287 void ppc_sys_device_disable_all(void)
 288 {
 289         enum ppc_sys_devices cur_dev;
 290         int i;
 291
 292         for (i = 0; i < cur_ppc_sys_spec->num_devices; i++) {
 293                 cur_dev = cur_ppc_sys_spec->device_list[i];
 294                 ppc_sys_device_disable(cur_dev);
 295         }
 296 }
 297
 298
 299 static int __init ppc_sys_init(void)
 300 {
 301         unsigned int i, dev_id, ret = 0;
 302
 303         BUG_ON(cur_ppc_sys_spec == NULL);
 304
 305         for (i = 0; i < cur_ppc_sys_spec->num_devices; i++) {
 306                 dev_id = cur_ppc_sys_spec->device_list[i];
 307                 if ((dev_id != -1) &&
 308                 !(cur_ppc_sys_spec->config[dev_id] & PPC_SYS_CONFIG_DISABLED)) {
 309                         if (ppc_sys_device_fixup != NULL)
 310                                 ppc_sys_device_fixup(&ppc_sys_platform_devices
 311                                                      [dev_id]);
 312                         if (platform_device_register
 313                             (&ppc_sys_platform_devices[dev_id])) {
 314                                 ret = 1;
 315                                 printk(KERN_ERR
 316                                        "unable to register device %d\n",
 317                                        dev_id);
 318                         }
 319                 }
 320         }
 321
 322         ppc_sys_inited = 1;
 323         return ret;
 324 }
 325
 326 subsys_initcall(ppc_sys_init);