drivers/pcmcia/at91_cf.c

   1 /*
   2  * at91_cf.c -- AT91 CompactFlash controller driver
   3  *
   4  * Copyright (C) 2005 David Brownell
   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 as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  */
  11
  12 #include <linux/module.h>
  13 #include <linux/kernel.h>
  14 #include <linux/platform_device.h>
  15 #include <linux/errno.h>
  16 #include <linux/init.h>
  17 #include <linux/interrupt.h>
  18 #include <linux/slab.h>
  19 #include <linux/gpio.h>
  20 #include <linux/platform_data/atmel.h>
  21 #include <linux/io.h>
  22 #include <linux/sizes.h>
  23 #include <linux/mfd/syscon.h>
  24 #include <linux/mfd/syscon/atmel-mc.h>
  25 #include <linux/of.h>
  26 #include <linux/of_device.h>
  27 #include <linux/of_gpio.h>
  28 #include <linux/regmap.h>
  29
  30 #include <pcmcia/ss.h>
  31
  32 /*
  33  * A0..A10 work in each range; A23 indicates I/O space;  A25 is CFRNW;
  34  * some other bit in {A24,A22..A11} is nREG to flag memory access
  35  * (vs attributes).  So more than 2KB/region would just be waste.
  36  * Note: These are offsets from the physical base address.
  37  */
  38 #define CF_ATTR_PHYS    (0)
  39 #define CF_IO_PHYS      (1 << 23)
  40 #define CF_MEM_PHYS     (0x017ff800)
  41
  42 struct regmap *mc;
  43
  44 /*--------------------------------------------------------------------------*/
  45
  46 struct at91_cf_socket {
  47         struct pcmcia_socket    socket;
  48
  49         unsigned                present:1;
  50
  51         struct platform_device  *pdev;
  52         struct at91_cf_data     *board;
  53
  54         unsigned long           phys_baseaddr;
  55 };
  56
  57 static inline int at91_cf_present(struct at91_cf_socket *cf)
  58 {
  59         return !gpio_get_value(cf->board->det_pin);
  60 }
  61
  62 /*--------------------------------------------------------------------------*/
  63
  64 static int at91_cf_ss_init(struct pcmcia_socket *s)
  65 {
  66         return 0;
  67 }
  68
  69 static irqreturn_t at91_cf_irq(int irq, void *_cf)
  70 {
  71         struct at91_cf_socket *cf = _cf;
  72
  73         if (irq == gpio_to_irq(cf->board->det_pin)) {
  74                 unsigned present = at91_cf_present(cf);
  75
  76                 /* kick pccard as needed */
  77                 if (present != cf->present) {
  78                         cf->present = present;
  79                         dev_dbg(&cf->pdev->dev, "card %s\n",
  80                                         present ? "present" : "gone");
  81                         pcmcia_parse_events(&cf->socket, SS_DETECT);
  82                 }
  83         }
  84
  85         return IRQ_HANDLED;
  86 }
  87
  88 static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
  89 {
  90         struct at91_cf_socket   *cf;
  91
  92         if (!sp)
  93                 return -EINVAL;
  94
  95         cf = container_of(s, struct at91_cf_socket, socket);
  96
  97         /* NOTE: CF is always 3VCARD */
  98         if (at91_cf_present(cf)) {
  99                 int rdy = gpio_is_valid(cf->board->irq_pin);    /* RDY/nIRQ */
 100                 int vcc = gpio_is_valid(cf->board->vcc_pin);
 101
 102                 *sp = SS_DETECT | SS_3VCARD;
 103                 if (!rdy || gpio_get_value(cf->board->irq_pin))
 104                         *sp |= SS_READY;
 105                 if (!vcc || gpio_get_value(cf->board->vcc_pin))
 106                         *sp |= SS_POWERON;
 107         } else
 108                 *sp = 0;
 109
 110         return 0;
 111 }
 112
 113 static int
 114 at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
 115 {
 116         struct at91_cf_socket   *cf;
 117
 118         cf = container_of(sock, struct at91_cf_socket, socket);
 119
 120         /* switch Vcc if needed and possible */
 121         if (gpio_is_valid(cf->board->vcc_pin)) {
 122                 switch (s->Vcc) {
 123                 case 0:
 124                         gpio_set_value(cf->board->vcc_pin, 0);
 125                         break;
 126                 case 33:
 127                         gpio_set_value(cf->board->vcc_pin, 1);
 128                         break;
 129                 default:
 130                         return -EINVAL;
 131                 }
 132         }
 133
 134         /* toggle reset if needed */
 135         gpio_set_value(cf->board->rst_pin, s->flags & SS_RESET);
 136
 137         dev_dbg(&cf->pdev->dev, "Vcc %d, io_irq %d, flags %04x csc %04x\n",
 138                                 s->Vcc, s->io_irq, s->flags, s->csc_mask);
 139
 140         return 0;
 141 }
 142
 143 static int at91_cf_ss_suspend(struct pcmcia_socket *s)
 144 {
 145         return at91_cf_set_socket(s, &dead_socket);
 146 }
 147
 148 /* we already mapped the I/O region */
 149 static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
 150 {
 151         struct at91_cf_socket   *cf;
 152         u32                     csr;
 153
 154         cf = container_of(s, struct at91_cf_socket, socket);
 155         io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);
 156
 157         /*
 158          * Use 16 bit accesses unless/until we need 8-bit i/o space.
 159          *
 160          * NOTE: this CF controller ignores IOIS16, so we can't really do
 161          * MAP_AUTOSZ.  The 16bit mode allows single byte access on either
 162          * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
 163          * purposes (and handles ide-cs).
 164          *
 165          * The 8bit mode is needed for odd byte access on D0-D7.  It seems
 166          * some cards only like that way to get at the odd byte, despite
 167          * CF 3.0 spec table 35 also giving the D8-D15 option.
 168          */
 169         if (!(io->flags & (MAP_16BIT | MAP_AUTOSZ))) {
 170                 csr = AT91_MC_SMC_DBW_8;
 171                 dev_dbg(&cf->pdev->dev, "8bit i/o bus\n");
 172         } else {
 173                 csr = AT91_MC_SMC_DBW_16;
 174                 dev_dbg(&cf->pdev->dev, "16bit i/o bus\n");
 175         }
 176         regmap_update_bits(mc, AT91_MC_SMC_CSR(cf->board->chipselect),
 177                            AT91_MC_SMC_DBW, csr);
 178
 179         io->start = cf->socket.io_offset;
 180         io->stop = io->start + SZ_2K - 1;
 181
 182         return 0;
 183 }
 184
 185 /* pcmcia layer maps/unmaps mem regions */
 186 static int
 187 at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
 188 {
 189         struct at91_cf_socket   *cf;
 190
 191         if (map->card_start)
 192                 return -EINVAL;
 193
 194         cf = container_of(s, struct at91_cf_socket, socket);
 195
 196         map->flags &= (MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT);
 197         if (map->flags & MAP_ATTRIB)
 198                 map->static_start = cf->phys_baseaddr + CF_ATTR_PHYS;
 199         else
 200                 map->static_start = cf->phys_baseaddr + CF_MEM_PHYS;
 201
 202         return 0;
 203 }
 204
 205 static struct pccard_operations at91_cf_ops = {
 206         .init                   = at91_cf_ss_init,
 207         .suspend                = at91_cf_ss_suspend,
 208         .get_status             = at91_cf_get_status,
 209         .set_socket             = at91_cf_set_socket,
 210         .set_io_map             = at91_cf_set_io_map,
 211         .set_mem_map            = at91_cf_set_mem_map,
 212 };
 213
 214 /*--------------------------------------------------------------------------*/
 215
 216 #if defined(CONFIG_OF)
 217 static const struct of_device_id at91_cf_dt_ids[] = {
 218         { .compatible = "atmel,at91rm9200-cf" },
 219         { /* sentinel */ }
 220 };
 221 MODULE_DEVICE_TABLE(of, at91_cf_dt_ids);
 222
 223 static int at91_cf_dt_init(struct platform_device *pdev)
 224 {
 225         struct at91_cf_data *board;
 226
 227         board = devm_kzalloc(&pdev->dev, sizeof(*board), GFP_KERNEL);
 228         if (!board)
 229                 return -ENOMEM;
 230
 231         board->irq_pin = of_get_gpio(pdev->dev.of_node, 0);
 232         board->det_pin = of_get_gpio(pdev->dev.of_node, 1);
 233         board->vcc_pin = of_get_gpio(pdev->dev.of_node, 2);
 234         board->rst_pin = of_get_gpio(pdev->dev.of_node, 3);
 235
 236         pdev->dev.platform_data = board;
 237
 238         mc = syscon_regmap_lookup_by_compatible("atmel,at91rm9200-sdramc");
 239         if (IS_ERR(mc))
 240                 return PTR_ERR(mc);
 241
 242         return 0;
 243 }
 244 #else
 245 static int at91_cf_dt_init(struct platform_device *pdev)
 246 {
 247         return -ENODEV;
 248 }
 249 #endif
 250
 251 static int at91_cf_probe(struct platform_device *pdev)
 252 {
 253         struct at91_cf_socket   *cf;
 254         struct at91_cf_data     *board = pdev->dev.platform_data;
 255         struct resource         *io;
 256         int                     status;
 257
 258         if (!board) {
 259                 status = at91_cf_dt_init(pdev);
 260                 if (status)
 261                         return status;
 262
 263                 board = pdev->dev.platform_data;
 264         }
 265
 266         if (!gpio_is_valid(board->det_pin) || !gpio_is_valid(board->rst_pin))
 267                 return -ENODEV;
 268
 269         io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 270         if (!io)
 271                 return -ENODEV;
 272
 273         cf = devm_kzalloc(&pdev->dev, sizeof(*cf), GFP_KERNEL);
 274         if (!cf)
 275                 return -ENOMEM;
 276
 277         cf->board = board;
 278         cf->pdev = pdev;
 279         cf->phys_baseaddr = io->start;
 280         platform_set_drvdata(pdev, cf);
 281
 282         /* must be a GPIO; ergo must trigger on both edges */
 283         status = devm_gpio_request(&pdev->dev, board->det_pin, "cf_det");
 284         if (status < 0)
 285                 return status;
 286
 287         status = devm_request_irq(&pdev->dev, gpio_to_irq(board->det_pin),
 288                                         at91_cf_irq, 0, "at91_cf detect", cf);
 289         if (status < 0)
 290                 return status;
 291
 292         device_init_wakeup(&pdev->dev, 1);
 293
 294         status = devm_gpio_request(&pdev->dev, board->rst_pin, "cf_rst");
 295         if (status < 0)
 296                 goto fail0a;
 297
 298         if (gpio_is_valid(board->vcc_pin)) {
 299                 status = devm_gpio_request(&pdev->dev, board->vcc_pin, "cf_vcc");
 300                 if (status < 0)
 301                         goto fail0a;
 302         }
 303
 304         /*
 305          * The card driver will request this irq later as needed.
 306          * but it causes lots of "irqNN: nobody cared" messages
 307          * unless we report that we handle everything (sigh).
 308          * (Note:  DK board doesn't wire the IRQ pin...)
 309          */
 310         if (gpio_is_valid(board->irq_pin)) {
 311                 status = devm_gpio_request(&pdev->dev, board->irq_pin, "cf_irq");
 312                 if (status < 0)
 313                         goto fail0a;
 314
 315                 status = devm_request_irq(&pdev->dev, gpio_to_irq(board->irq_pin),
 316                                         at91_cf_irq, IRQF_SHARED, "at91_cf", cf);
 317                 if (status < 0)
 318                         goto fail0a;
 319                 cf->socket.pci_irq = gpio_to_irq(board->irq_pin);
 320         } else
 321                 cf->socket.pci_irq = nr_irqs + 1;
 322
 323         /*
 324          * pcmcia layer only remaps "real" memory not iospace
 325          * io_offset is set to 0x10000 to avoid the check in static_find_io().
 326          * */
 327         cf->socket.io_offset = 0x10000;
 328         status = pci_ioremap_io(0x10000, cf->phys_baseaddr + CF_IO_PHYS);
 329         if (status)
 330                 goto fail0a;
 331
 332         /* reserve chip-select regions */
 333         if (!devm_request_mem_region(&pdev->dev, io->start, resource_size(io), "at91_cf")) {
 334                 status = -ENXIO;
 335                 goto fail0a;
 336         }
 337
 338         dev_info(&pdev->dev, "irqs det #%d, io #%d\n",
 339                 gpio_to_irq(board->det_pin), gpio_to_irq(board->irq_pin));
 340
 341         cf->socket.owner = THIS_MODULE;
 342         cf->socket.dev.parent = &pdev->dev;
 343         cf->socket.ops = &at91_cf_ops;
 344         cf->socket.resource_ops = &pccard_static_ops;
 345         cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
 346                                 | SS_CAP_MEM_ALIGN;
 347         cf->socket.map_size = SZ_2K;
 348         cf->socket.io[0].res = io;
 349
 350         status = pcmcia_register_socket(&cf->socket);
 351         if (status < 0)
 352                 goto fail0a;
 353
 354         return 0;
 355
 356 fail0a:
 357         device_init_wakeup(&pdev->dev, 0);
 358         return status;
 359 }
 360
 361 static int at91_cf_remove(struct platform_device *pdev)
 362 {
 363         struct at91_cf_socket   *cf = platform_get_drvdata(pdev);
 364
 365         pcmcia_unregister_socket(&cf->socket);
 366         device_init_wakeup(&pdev->dev, 0);
 367
 368         return 0;
 369 }
 370
 371 #ifdef  CONFIG_PM
 372
 373 static int at91_cf_suspend(struct platform_device *pdev, pm_message_t mesg)
 374 {
 375         struct at91_cf_socket   *cf = platform_get_drvdata(pdev);
 376         struct at91_cf_data     *board = cf->board;
 377
 378         if (device_may_wakeup(&pdev->dev)) {
 379                 enable_irq_wake(gpio_to_irq(board->det_pin));
 380                 if (gpio_is_valid(board->irq_pin))
 381                         enable_irq_wake(gpio_to_irq(board->irq_pin));
 382         }
 383         return 0;
 384 }
 385
 386 static int at91_cf_resume(struct platform_device *pdev)
 387 {
 388         struct at91_cf_socket   *cf = platform_get_drvdata(pdev);
 389         struct at91_cf_data     *board = cf->board;
 390
 391         if (device_may_wakeup(&pdev->dev)) {
 392                 disable_irq_wake(gpio_to_irq(board->det_pin));
 393                 if (gpio_is_valid(board->irq_pin))
 394                         disable_irq_wake(gpio_to_irq(board->irq_pin));
 395         }
 396
 397         return 0;
 398 }
 399
 400 #else
 401 #define at91_cf_suspend         NULL
 402 #define at91_cf_resume          NULL
 403 #endif
 404
 405 static struct platform_driver at91_cf_driver = {
 406         .driver = {
 407                 .name           = "at91_cf",
 408                 .of_match_table = of_match_ptr(at91_cf_dt_ids),
 409         },
 410         .probe          = at91_cf_probe,
 411         .remove         = at91_cf_remove,
 412         .suspend        = at91_cf_suspend,
 413         .resume         = at91_cf_resume,
 414 };
 415
 416 module_platform_driver(at91_cf_driver);
 417
 418 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
 419 MODULE_AUTHOR("David Brownell");
 420 MODULE_LICENSE("GPL");
 421 MODULE_ALIAS("platform:at91_cf");