drivers/pcmcia/pcmcia_cis.c

   1 /*
   2  * PCMCIA high-level CIS access functions
   3  *
   4  * The initial developer of the original code is David A. Hinds
   5  * <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
   6  * are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
   7  *
   8  * Copyright (C) 1999        David A. Hinds
   9  * Copyright (C) 2004-2010   Dominik Brodowski
  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  */
  16
  17 #include <linux/slab.h>
  18 #include <linux/module.h>
  19 #include <linux/kernel.h>
  20 #include <linux/netdevice.h>
  21
  22 #include <pcmcia/cisreg.h>
  23 #include <pcmcia/cistpl.h>
  24 #include <pcmcia/ss.h>
  25 #include <pcmcia/ds.h>
  26 #include "cs_internal.h"
  27
  28
  29 /**
  30  * pccard_read_tuple() - internal CIS tuple access
  31  * @s:          the struct pcmcia_socket where the card is inserted
  32  * @function:   the device function we loop for
  33  * @code:       which CIS code shall we look for?
  34  * @parse:      buffer where the tuple shall be parsed (or NULL, if no parse)
  35  *
  36  * pccard_read_tuple() reads out one tuple and attempts to parse it
  37  */
  38 int pccard_read_tuple(struct pcmcia_socket *s, unsigned int function,
  39                 cisdata_t code, void *parse)
  40 {
  41         tuple_t tuple;
  42         cisdata_t *buf;
  43         int ret;
  44
  45         buf = kmalloc(256, GFP_KERNEL);
  46         if (buf == NULL) {
  47                 dev_printk(KERN_WARNING, &s->dev, "no memory to read tuple\n");
  48                 return -ENOMEM;
  49         }
  50         tuple.DesiredTuple = code;
  51         tuple.Attributes = 0;
  52         if (function == BIND_FN_ALL)
  53                 tuple.Attributes = TUPLE_RETURN_COMMON;
  54         ret = pccard_get_first_tuple(s, function, &tuple);
  55         if (ret != 0)
  56                 goto done;
  57         tuple.TupleData = buf;
  58         tuple.TupleOffset = 0;
  59         tuple.TupleDataMax = 255;
  60         ret = pccard_get_tuple_data(s, &tuple);
  61         if (ret != 0)
  62                 goto done;
  63         ret = pcmcia_parse_tuple(&tuple, parse);
  64 done:
  65         kfree(buf);
  66         return ret;
  67 }
  68
  69
  70 /**
  71  * pccard_loop_tuple() - loop over tuples in the CIS
  72  * @s:          the struct pcmcia_socket where the card is inserted
  73  * @function:   the device function we loop for
  74  * @code:       which CIS code shall we look for?
  75  * @parse:      buffer where the tuple shall be parsed (or NULL, if no parse)
  76  * @priv_data:  private data to be passed to the loop_tuple function.
  77  * @loop_tuple: function to call for each CIS entry of type @function. IT
  78  *              gets passed the raw tuple, the paresed tuple (if @parse is
  79  *              set) and @priv_data.
  80  *
  81  * pccard_loop_tuple() loops over all CIS entries of type @function, and
  82  * calls the @loop_tuple function for each entry. If the call to @loop_tuple
  83  * returns 0, the loop exits. Returns 0 on success or errorcode otherwise.
  84  */
  85 int pccard_loop_tuple(struct pcmcia_socket *s, unsigned int function,
  86                       cisdata_t code, cisparse_t *parse, void *priv_data,
  87                       int (*loop_tuple) (tuple_t *tuple,
  88                                          cisparse_t *parse,
  89                                          void *priv_data))
  90 {
  91         tuple_t tuple;
  92         cisdata_t *buf;
  93         int ret;
  94
  95         buf = kzalloc(256, GFP_KERNEL);
  96         if (buf == NULL) {
  97                 dev_printk(KERN_WARNING, &s->dev, "no memory to read tuple\n");
  98                 return -ENOMEM;
  99         }
 100
 101         tuple.TupleData = buf;
 102         tuple.TupleDataMax = 255;
 103         tuple.TupleOffset = 0;
 104         tuple.DesiredTuple = code;
 105         tuple.Attributes = 0;
 106
 107         ret = pccard_get_first_tuple(s, function, &tuple);
 108         while (!ret) {
 109                 if (pccard_get_tuple_data(s, &tuple))
 110                         goto next_entry;
 111
 112                 if (parse)
 113                         if (pcmcia_parse_tuple(&tuple, parse))
 114                                 goto next_entry;
 115
 116                 ret = loop_tuple(&tuple, parse, priv_data);
 117                 if (!ret)
 118                         break;
 119
 120 next_entry:
 121                 ret = pccard_get_next_tuple(s, function, &tuple);
 122         }
 123
 124         kfree(buf);
 125         return ret;
 126 }
 127
 128
 129 /**
 130  * pcmcia_io_cfg_data_width() - convert cfgtable to data path width parameter
 131  */
 132 static int pcmcia_io_cfg_data_width(unsigned int flags)
 133 {
 134         if (!(flags & CISTPL_IO_8BIT))
 135                 return IO_DATA_PATH_WIDTH_16;
 136         if (!(flags & CISTPL_IO_16BIT))
 137                 return IO_DATA_PATH_WIDTH_8;
 138         return IO_DATA_PATH_WIDTH_AUTO;
 139 }
 140
 141
 142 struct pcmcia_cfg_mem {
 143         struct pcmcia_device *p_dev;
 144         int (*conf_check) (struct pcmcia_device *p_dev, void *priv_data);
 145         void *priv_data;
 146         cisparse_t parse;
 147         cistpl_cftable_entry_t dflt;
 148 };
 149
 150 /**
 151  * pcmcia_do_loop_config() - internal helper for pcmcia_loop_config()
 152  *
 153  * pcmcia_do_loop_config() is the internal callback for the call from
 154  * pcmcia_loop_config() to pccard_loop_tuple(). Data is transferred
 155  * by a struct pcmcia_cfg_mem.
 156  */
 157 static int pcmcia_do_loop_config(tuple_t *tuple, cisparse_t *parse, void *priv)
 158 {
 159         struct pcmcia_cfg_mem *cfg_mem = priv;
 160         struct pcmcia_device *p_dev = cfg_mem->p_dev;
 161         cistpl_cftable_entry_t *cfg = &parse->cftable_entry;
 162         cistpl_cftable_entry_t *dflt = &cfg_mem->dflt;
 163         unsigned int flags = p_dev->config_flags;
 164         unsigned int vcc = p_dev->socket->socket.Vcc;
 165
 166         dev_dbg(&p_dev->dev, "testing configuration %x, autoconf %x\n",
 167                 cfg->index, flags);
 168
 169         /* default values */
 170         cfg_mem->p_dev->config_index = cfg->index;
 171         if (cfg->flags & CISTPL_CFTABLE_DEFAULT)
 172                 cfg_mem->dflt = *cfg;
 173
 174         /* check for matching Vcc? */
 175         if (flags & CONF_AUTO_CHECK_VCC) {
 176                 if (cfg->vcc.present & (1 << CISTPL_POWER_VNOM)) {
 177                         if (vcc != cfg->vcc.param[CISTPL_POWER_VNOM] / 10000)
 178                                 return -ENODEV;
 179                 } else if (dflt->vcc.present & (1 << CISTPL_POWER_VNOM)) {
 180                         if (vcc != dflt->vcc.param[CISTPL_POWER_VNOM] / 10000)
 181                                 return -ENODEV;
 182                 }
 183         }
 184
 185         /* set Vpp? */
 186         if (flags & CONF_AUTO_SET_VPP) {
 187                 if (cfg->vpp1.present & (1 << CISTPL_POWER_VNOM))
 188                         p_dev->vpp = cfg->vpp1.param[CISTPL_POWER_VNOM] / 10000;
 189                 else if (dflt->vpp1.present & (1 << CISTPL_POWER_VNOM))
 190                         p_dev->vpp =
 191                                 dflt->vpp1.param[CISTPL_POWER_VNOM] / 10000;
 192         }
 193
 194         /* enable audio? */
 195         if ((flags & CONF_AUTO_AUDIO) && (cfg->flags & CISTPL_CFTABLE_AUDIO))
 196                 p_dev->config_flags |= CONF_ENABLE_SPKR;
 197
 198
 199         /* IO window settings? */
 200         if (flags & CONF_AUTO_SET_IO) {
 201                 cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt->io;
 202                 int i = 0;
 203
 204                 p_dev->resource[0]->start = p_dev->resource[0]->end = 0;
 205                 p_dev->resource[1]->start = p_dev->resource[1]->end = 0;
 206                 if (io->nwin == 0)
 207                         return -ENODEV;
 208
 209                 p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
 210                 p_dev->resource[0]->flags |=
 211                                         pcmcia_io_cfg_data_width(io->flags);
 212                 if (io->nwin > 1) {
 213                         /* For multifunction cards, by convention, we
 214                          * configure the network function with window 0,
 215                          * and serial with window 1 */
 216                         i = (io->win[1].len > io->win[0].len);
 217                         p_dev->resource[1]->flags = p_dev->resource[0]->flags;
 218                         p_dev->resource[1]->start = io->win[1-i].base;
 219                         p_dev->resource[1]->end = io->win[1-i].len;
 220                 }
 221                 p_dev->resource[0]->start = io->win[i].base;
 222                 p_dev->resource[0]->end = io->win[i].len;
 223                 p_dev->io_lines = io->flags & CISTPL_IO_LINES_MASK;
 224         }
 225
 226         /* MEM window settings? */
 227         if (flags & CONF_AUTO_SET_IOMEM) {
 228                 /* so far, we only set one memory window */
 229                 cistpl_mem_t *mem = (cfg->mem.nwin) ? &cfg->mem : &dflt->mem;
 230
 231                 p_dev->resource[2]->start = p_dev->resource[2]->end = 0;
 232                 if (mem->nwin == 0)
 233                         return -ENODEV;
 234
 235                 p_dev->resource[2]->start = mem->win[0].host_addr;
 236                 p_dev->resource[2]->end = mem->win[0].len;
 237                 if (p_dev->resource[2]->end < 0x1000)
 238                         p_dev->resource[2]->end = 0x1000;
 239                 p_dev->card_addr = mem->win[0].card_addr;
 240         }
 241
 242         dev_dbg(&p_dev->dev,
 243                 "checking configuration %x: %pr %pr %pr (%d lines)\n",
 244                 p_dev->config_index, p_dev->resource[0], p_dev->resource[1],
 245                 p_dev->resource[2], p_dev->io_lines);
 246
 247         return cfg_mem->conf_check(p_dev, cfg_mem->priv_data);
 248 }
 249
 250 /**
 251  * pcmcia_loop_config() - loop over configuration options
 252  * @p_dev:      the struct pcmcia_device which we need to loop for.
 253  * @conf_check: function to call for each configuration option.
 254  *              It gets passed the struct pcmcia_device and private data
 255  *              being passed to pcmcia_loop_config()
 256  * @priv_data:  private data to be passed to the conf_check function.
 257  *
 258  * pcmcia_loop_config() loops over all configuration options, and calls
 259  * the driver-specific conf_check() for each one, checking whether
 260  * it is a valid one. Returns 0 on success or errorcode otherwise.
 261  */
 262 int pcmcia_loop_config(struct pcmcia_device *p_dev,
 263                        int      (*conf_check)   (struct pcmcia_device *p_dev,
 264                                                  void *priv_data),
 265                        void *priv_data)
 266 {
 267         struct pcmcia_cfg_mem *cfg_mem;
 268         int ret;
 269
 270         cfg_mem = kzalloc(sizeof(struct pcmcia_cfg_mem), GFP_KERNEL);
 271         if (cfg_mem == NULL)
 272                 return -ENOMEM;
 273
 274         cfg_mem->p_dev = p_dev;
 275         cfg_mem->conf_check = conf_check;
 276         cfg_mem->priv_data = priv_data;
 277
 278         ret = pccard_loop_tuple(p_dev->socket, p_dev->func,
 279                                 CISTPL_CFTABLE_ENTRY, &cfg_mem->parse,
 280                                 cfg_mem, pcmcia_do_loop_config);
 281
 282         kfree(cfg_mem);
 283         return ret;
 284 }
 285 EXPORT_SYMBOL(pcmcia_loop_config);
 286
 287
 288 struct pcmcia_loop_mem {
 289         struct pcmcia_device *p_dev;
 290         void *priv_data;
 291         int (*loop_tuple) (struct pcmcia_device *p_dev,
 292                            tuple_t *tuple,
 293                            void *priv_data);
 294 };
 295
 296 /**
 297  * pcmcia_do_loop_tuple() - internal helper for pcmcia_loop_config()
 298  *
 299  * pcmcia_do_loop_tuple() is the internal callback for the call from
 300  * pcmcia_loop_tuple() to pccard_loop_tuple(). Data is transferred
 301  * by a struct pcmcia_cfg_mem.
 302  */
 303 static int pcmcia_do_loop_tuple(tuple_t *tuple, cisparse_t *parse, void *priv)
 304 {
 305         struct pcmcia_loop_mem *loop = priv;
 306
 307         return loop->loop_tuple(loop->p_dev, tuple, loop->priv_data);
 308 };
 309
 310 /**
 311  * pcmcia_loop_tuple() - loop over tuples in the CIS
 312  * @p_dev:      the struct pcmcia_device which we need to loop for.
 313  * @code:       which CIS code shall we look for?
 314  * @priv_data:  private data to be passed to the loop_tuple function.
 315  * @loop_tuple: function to call for each CIS entry of type @function. IT
 316  *              gets passed the raw tuple and @priv_data.
 317  *
 318  * pcmcia_loop_tuple() loops over all CIS entries of type @function, and
 319  * calls the @loop_tuple function for each entry. If the call to @loop_tuple
 320  * returns 0, the loop exits. Returns 0 on success or errorcode otherwise.
 321  */
 322 int pcmcia_loop_tuple(struct pcmcia_device *p_dev, cisdata_t code,
 323                       int (*loop_tuple) (struct pcmcia_device *p_dev,
 324                                          tuple_t *tuple,
 325                                          void *priv_data),
 326                       void *priv_data)
 327 {
 328         struct pcmcia_loop_mem loop = {
 329                 .p_dev = p_dev,
 330                 .loop_tuple = loop_tuple,
 331                 .priv_data = priv_data};
 332
 333         return pccard_loop_tuple(p_dev->socket, p_dev->func, code, NULL,
 334                                  &loop, pcmcia_do_loop_tuple);
 335 }
 336 EXPORT_SYMBOL(pcmcia_loop_tuple);
 337
 338
 339 struct pcmcia_loop_get {
 340         size_t len;
 341         cisdata_t **buf;
 342 };
 343
 344 /**
 345  * pcmcia_do_get_tuple() - internal helper for pcmcia_get_tuple()
 346  *
 347  * pcmcia_do_get_tuple() is the internal callback for the call from
 348  * pcmcia_get_tuple() to pcmcia_loop_tuple(). As we're only interested in
 349  * the first tuple, return 0 unconditionally. Create a memory buffer large
 350  * enough to hold the content of the tuple, and fill it with the tuple data.
 351  * The caller is responsible to free the buffer.
 352  */
 353 static int pcmcia_do_get_tuple(struct pcmcia_device *p_dev, tuple_t *tuple,
 354                                void *priv)
 355 {
 356         struct pcmcia_loop_get *get = priv;
 357
 358         *get->buf = kzalloc(tuple->TupleDataLen, GFP_KERNEL);
 359         if (*get->buf) {
 360                 get->len = tuple->TupleDataLen;
 361                 memcpy(*get->buf, tuple->TupleData, tuple->TupleDataLen);
 362         } else
 363                 dev_dbg(&p_dev->dev, "do_get_tuple: out of memory\n");
 364         return 0;
 365 }
 366
 367 /**
 368  * pcmcia_get_tuple() - get first tuple from CIS
 369  * @p_dev:      the struct pcmcia_device which we need to loop for.
 370  * @code:       which CIS code shall we look for?
 371  * @buf:        pointer to store the buffer to.
 372  *
 373  * pcmcia_get_tuple() gets the content of the first CIS entry of type @code.
 374  * It returns the buffer length (or zero). The caller is responsible to free
 375  * the buffer passed in @buf.
 376  */
 377 size_t pcmcia_get_tuple(struct pcmcia_device *p_dev, cisdata_t code,
 378                         unsigned char **buf)
 379 {
 380         struct pcmcia_loop_get get = {
 381                 .len = 0,
 382                 .buf = buf,
 383         };
 384
 385         *get.buf = NULL;
 386         pcmcia_loop_tuple(p_dev, code, pcmcia_do_get_tuple, &get);
 387
 388         return get.len;
 389 }
 390 EXPORT_SYMBOL(pcmcia_get_tuple);
 391
 392
 393 /**
 394  * pcmcia_do_get_mac() - internal helper for pcmcia_get_mac_from_cis()
 395  *
 396  * pcmcia_do_get_mac() is the internal callback for the call from
 397  * pcmcia_get_mac_from_cis() to pcmcia_loop_tuple(). We check whether the
 398  * tuple contains a proper LAN_NODE_ID of length 6, and copy the data
 399  * to struct net_device->dev_addr[i].
 400  */
 401 static int pcmcia_do_get_mac(struct pcmcia_device *p_dev, tuple_t *tuple,
 402                              void *priv)
 403 {
 404         struct net_device *dev = priv;
 405         int i;
 406
 407         if (tuple->TupleData[0] != CISTPL_FUNCE_LAN_NODE_ID)
 408                 return -EINVAL;
 409         if (tuple->TupleDataLen < ETH_ALEN + 2) {
 410                 dev_warn(&p_dev->dev, "Invalid CIS tuple length for "
 411                         "LAN_NODE_ID\n");
 412                 return -EINVAL;
 413         }
 414
 415         if (tuple->TupleData[1] != ETH_ALEN) {
 416                 dev_warn(&p_dev->dev, "Invalid header for LAN_NODE_ID\n");
 417                 return -EINVAL;
 418         }
 419         for (i = 0; i < 6; i++)
 420                 dev->dev_addr[i] = tuple->TupleData[i+2];
 421         return 0;
 422 }
 423
 424 /**
 425  * pcmcia_get_mac_from_cis() - read out MAC address from CISTPL_FUNCE
 426  * @p_dev:      the struct pcmcia_device for which we want the address.
 427  * @dev:        a properly prepared struct net_device to store the info to.
 428  *
 429  * pcmcia_get_mac_from_cis() reads out the hardware MAC address from
 430  * CISTPL_FUNCE and stores it into struct net_device *dev->dev_addr which
 431  * must be set up properly by the driver (see examples!).
 432  */
 433 int pcmcia_get_mac_from_cis(struct pcmcia_device *p_dev, struct net_device *dev)
 434 {
 435         return pcmcia_loop_tuple(p_dev, CISTPL_FUNCE, pcmcia_do_get_mac, dev);
 436 }
 437 EXPORT_SYMBOL(pcmcia_get_mac_from_cis);
 438