drivers/pcmcia/electra_cf.c

   1 /*
   2  * Copyright (C) 2007 PA Semi, Inc
   3  *
   4  * Maintained by: Olof Johansson <olof@lixom.net>
   5  *
   6  * Based on drivers/pcmcia/omap_cf.c
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/kernel.h>
  25 #include <linux/sched.h>
  26 #include <linux/platform_device.h>
  27 #include <linux/errno.h>
  28 #include <linux/init.h>
  29 #include <linux/delay.h>
  30 #include <linux/interrupt.h>
  31 #include <linux/mm.h>
  32 #include <linux/vmalloc.h>
  33 #include <linux/of_address.h>
  34 #include <linux/of_irq.h>
  35 #include <linux/of_platform.h>
  36 #include <linux/slab.h>
  37
  38 #include <pcmcia/ss.h>
  39
  40 static const char driver_name[] = "electra-cf";
  41
  42 struct electra_cf_socket {
  43         struct pcmcia_socket    socket;
  44
  45         struct timer_list       timer;
  46         unsigned                present:1;
  47         unsigned                active:1;
  48
  49         struct platform_device  *ofdev;
  50         unsigned long           mem_phys;
  51         void __iomem *          mem_base;
  52         unsigned long           mem_size;
  53         void __iomem *          io_virt;
  54         unsigned int            io_base;
  55         unsigned int            io_size;
  56         u_int                   irq;
  57         struct resource         iomem;
  58         void __iomem *          gpio_base;
  59         int                     gpio_detect;
  60         int                     gpio_vsense;
  61         int                     gpio_3v;
  62         int                     gpio_5v;
  63 };
  64
  65 #define POLL_INTERVAL           (2 * HZ)
  66
  67
  68 static int electra_cf_present(struct electra_cf_socket *cf)
  69 {
  70         unsigned int gpio;
  71
  72         gpio = in_le32(cf->gpio_base+0x40);
  73         return !(gpio & (1 << cf->gpio_detect));
  74 }
  75
  76 static int electra_cf_ss_init(struct pcmcia_socket *s)
  77 {
  78         return 0;
  79 }
  80
  81 /* the timer is primarily to kick this socket's pccardd */
  82 static void electra_cf_timer(unsigned long _cf)
  83 {
  84         struct electra_cf_socket *cf = (void *) _cf;
  85         int present = electra_cf_present(cf);
  86
  87         if (present != cf->present) {
  88                 cf->present = present;
  89                 pcmcia_parse_events(&cf->socket, SS_DETECT);
  90         }
  91
  92         if (cf->active)
  93                 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
  94 }
  95
  96 static irqreturn_t electra_cf_irq(int irq, void *_cf)
  97 {
  98         electra_cf_timer((unsigned long)_cf);
  99         return IRQ_HANDLED;
 100 }
 101
 102 static int electra_cf_get_status(struct pcmcia_socket *s, u_int *sp)
 103 {
 104         struct electra_cf_socket *cf;
 105
 106         if (!sp)
 107                 return -EINVAL;
 108
 109         cf = container_of(s, struct electra_cf_socket, socket);
 110
 111         /* NOTE CF is always 3VCARD */
 112         if (electra_cf_present(cf)) {
 113                 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
 114
 115                 s->pci_irq = cf->irq;
 116         } else
 117                 *sp = 0;
 118         return 0;
 119 }
 120
 121 static int electra_cf_set_socket(struct pcmcia_socket *sock,
 122                                  struct socket_state_t *s)
 123 {
 124         unsigned int gpio;
 125         unsigned int vcc;
 126         struct electra_cf_socket *cf;
 127
 128         cf = container_of(sock, struct electra_cf_socket, socket);
 129
 130         /* "reset" means no power in our case */
 131         vcc = (s->flags & SS_RESET) ? 0 : s->Vcc;
 132
 133         switch (vcc) {
 134         case 0:
 135                 gpio = 0;
 136                 break;
 137         case 33:
 138                 gpio = (1 << cf->gpio_3v);
 139                 break;
 140         case 5:
 141                 gpio = (1 << cf->gpio_5v);
 142                 break;
 143         default:
 144                 return -EINVAL;
 145         }
 146
 147         gpio |= 1 << (cf->gpio_3v + 16); /* enwr */
 148         gpio |= 1 << (cf->gpio_5v + 16); /* enwr */
 149         out_le32(cf->gpio_base+0x90, gpio);
 150
 151         pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
 152                 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
 153
 154         return 0;
 155 }
 156
 157 static int electra_cf_set_io_map(struct pcmcia_socket *s,
 158                                  struct pccard_io_map *io)
 159 {
 160         return 0;
 161 }
 162
 163 static int electra_cf_set_mem_map(struct pcmcia_socket *s,
 164                                   struct pccard_mem_map *map)
 165 {
 166         struct electra_cf_socket *cf;
 167
 168         if (map->card_start)
 169                 return -EINVAL;
 170         cf = container_of(s, struct electra_cf_socket, socket);
 171         map->static_start = cf->mem_phys;
 172         map->flags &= MAP_ACTIVE|MAP_ATTRIB;
 173         if (!(map->flags & MAP_ATTRIB))
 174                 map->static_start += 0x800;
 175         return 0;
 176 }
 177
 178 static struct pccard_operations electra_cf_ops = {
 179         .init                   = electra_cf_ss_init,
 180         .get_status             = electra_cf_get_status,
 181         .set_socket             = electra_cf_set_socket,
 182         .set_io_map             = electra_cf_set_io_map,
 183         .set_mem_map            = electra_cf_set_mem_map,
 184 };
 185
 186 static int electra_cf_probe(struct platform_device *ofdev)
 187 {
 188         struct device *device = &ofdev->dev;
 189         struct device_node *np = ofdev->dev.of_node;
 190         struct electra_cf_socket   *cf;
 191         struct resource mem, io;
 192         int status;
 193         const unsigned int *prop;
 194         int err;
 195         struct vm_struct *area;
 196
 197         err = of_address_to_resource(np, 0, &mem);
 198         if (err)
 199                 return -EINVAL;
 200
 201         err = of_address_to_resource(np, 1, &io);
 202         if (err)
 203                 return -EINVAL;
 204
 205         cf = kzalloc(sizeof *cf, GFP_KERNEL);
 206         if (!cf)
 207                 return -ENOMEM;
 208
 209         setup_timer(&cf->timer, electra_cf_timer, (unsigned long)cf);
 210         cf->irq = NO_IRQ;
 211
 212         cf->ofdev = ofdev;
 213         cf->mem_phys = mem.start;
 214         cf->mem_size = PAGE_ALIGN(resource_size(&mem));
 215         cf->mem_base = ioremap(cf->mem_phys, cf->mem_size);
 216         cf->io_size = PAGE_ALIGN(resource_size(&io));
 217
 218         area = __get_vm_area(cf->io_size, 0, PHB_IO_BASE, PHB_IO_END);
 219         if (area == NULL)
 220                 return -ENOMEM;
 221
 222         cf->io_virt = (void __iomem *)(area->addr);
 223
 224         cf->gpio_base = ioremap(0xfc103000, 0x1000);
 225         dev_set_drvdata(device, cf);
 226
 227         if (!cf->mem_base || !cf->io_virt || !cf->gpio_base ||
 228             (__ioremap_at(io.start, cf->io_virt, cf->io_size,
 229                 _PAGE_NO_CACHE | _PAGE_GUARDED) == NULL)) {
 230                 dev_err(device, "can't ioremap ranges\n");
 231                 status = -ENOMEM;
 232                 goto fail1;
 233         }
 234
 235
 236         cf->io_base = (unsigned long)cf->io_virt - VMALLOC_END;
 237
 238         cf->iomem.start = (unsigned long)cf->mem_base;
 239         cf->iomem.end = (unsigned long)cf->mem_base + (mem.end - mem.start);
 240         cf->iomem.flags = IORESOURCE_MEM;
 241
 242         cf->irq = irq_of_parse_and_map(np, 0);
 243
 244         status = request_irq(cf->irq, electra_cf_irq, IRQF_SHARED,
 245                              driver_name, cf);
 246         if (status < 0) {
 247                 dev_err(device, "request_irq failed\n");
 248                 goto fail1;
 249         }
 250
 251         cf->socket.pci_irq = cf->irq;
 252
 253         prop = of_get_property(np, "card-detect-gpio", NULL);
 254         if (!prop)
 255                 goto fail1;
 256         cf->gpio_detect = *prop;
 257
 258         prop = of_get_property(np, "card-vsense-gpio", NULL);
 259         if (!prop)
 260                 goto fail1;
 261         cf->gpio_vsense = *prop;
 262
 263         prop = of_get_property(np, "card-3v-gpio", NULL);
 264         if (!prop)
 265                 goto fail1;
 266         cf->gpio_3v = *prop;
 267
 268         prop = of_get_property(np, "card-5v-gpio", NULL);
 269         if (!prop)
 270                 goto fail1;
 271         cf->gpio_5v = *prop;
 272
 273         cf->socket.io_offset = cf->io_base;
 274
 275         /* reserve chip-select regions */
 276         if (!request_mem_region(cf->mem_phys, cf->mem_size, driver_name)) {
 277                 status = -ENXIO;
 278                 dev_err(device, "Can't claim memory region\n");
 279                 goto fail1;
 280         }
 281
 282         if (!request_region(cf->io_base, cf->io_size, driver_name)) {
 283                 status = -ENXIO;
 284                 dev_err(device, "Can't claim I/O region\n");
 285                 goto fail2;
 286         }
 287
 288         cf->socket.owner = THIS_MODULE;
 289         cf->socket.dev.parent = &ofdev->dev;
 290         cf->socket.ops = &electra_cf_ops;
 291         cf->socket.resource_ops = &pccard_static_ops;
 292         cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP |
 293                                 SS_CAP_MEM_ALIGN;
 294         cf->socket.map_size = 0x800;
 295
 296         status = pcmcia_register_socket(&cf->socket);
 297         if (status < 0) {
 298                 dev_err(device, "pcmcia_register_socket failed\n");
 299                 goto fail3;
 300         }
 301
 302         dev_info(device, "at mem 0x%lx io 0x%llx irq %d\n",
 303                  cf->mem_phys, io.start, cf->irq);
 304
 305         cf->active = 1;
 306         electra_cf_timer((unsigned long)cf);
 307         return 0;
 308
 309 fail3:
 310         release_region(cf->io_base, cf->io_size);
 311 fail2:
 312         release_mem_region(cf->mem_phys, cf->mem_size);
 313 fail1:
 314         if (cf->irq != NO_IRQ)
 315                 free_irq(cf->irq, cf);
 316
 317         if (cf->io_virt)
 318                 __iounmap_at(cf->io_virt, cf->io_size);
 319         if (cf->mem_base)
 320                 iounmap(cf->mem_base);
 321         if (cf->gpio_base)
 322                 iounmap(cf->gpio_base);
 323         device_init_wakeup(&ofdev->dev, 0);
 324         kfree(cf);
 325         return status;
 326
 327 }
 328
 329 static int electra_cf_remove(struct platform_device *ofdev)
 330 {
 331         struct device *device = &ofdev->dev;
 332         struct electra_cf_socket *cf;
 333
 334         cf = dev_get_drvdata(device);
 335
 336         cf->active = 0;
 337         pcmcia_unregister_socket(&cf->socket);
 338         free_irq(cf->irq, cf);
 339         del_timer_sync(&cf->timer);
 340
 341         __iounmap_at(cf->io_virt, cf->io_size);
 342         iounmap(cf->mem_base);
 343         iounmap(cf->gpio_base);
 344         release_mem_region(cf->mem_phys, cf->mem_size);
 345         release_region(cf->io_base, cf->io_size);
 346
 347         kfree(cf);
 348
 349         return 0;
 350 }
 351
 352 static const struct of_device_id electra_cf_match[] = {
 353         {
 354                 .compatible   = "electra-cf",
 355         },
 356         {},
 357 };
 358 MODULE_DEVICE_TABLE(of, electra_cf_match);
 359
 360 static struct platform_driver electra_cf_driver = {
 361         .driver = {
 362                 .name = driver_name,
 363                 .of_match_table = electra_cf_match,
 364         },
 365         .probe    = electra_cf_probe,
 366         .remove   = electra_cf_remove,
 367 };
 368
 369 module_platform_driver(electra_cf_driver);
 370
 371 MODULE_LICENSE("GPL");
 372 MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
 373 MODULE_DESCRIPTION("PA Semi Electra CF driver");