linux/drivers/pcmcia/electra_cf.c
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   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_platform.h>
  34
  35#include <pcmcia/ss.h>
  36
  37static const char driver_name[] = "electra-cf";
  38
  39struct electra_cf_socket {
  40        struct pcmcia_socket    socket;
  41
  42        struct timer_list       timer;
  43        unsigned                present:1;
  44        unsigned                active:1;
  45
  46        struct of_device        *ofdev;
  47        unsigned long           mem_phys;
  48        void __iomem *          mem_base;
  49        unsigned long           mem_size;
  50        void __iomem *          io_virt;
  51        unsigned int            io_base;
  52        unsigned int            io_size;
  53        u_int                   irq;
  54        struct resource         iomem;
  55        void __iomem *          gpio_base;
  56        int                     gpio_detect;
  57        int                     gpio_vsense;
  58        int                     gpio_3v;
  59        int                     gpio_5v;
  60};
  61
  62#define POLL_INTERVAL           (2 * HZ)
  63
  64
  65static int electra_cf_present(struct electra_cf_socket *cf)
  66{
  67        unsigned int gpio;
  68
  69        gpio = in_le32(cf->gpio_base+0x40);
  70        return !(gpio & (1 << cf->gpio_detect));
  71}
  72
  73static int electra_cf_ss_init(struct pcmcia_socket *s)
  74{
  75        return 0;
  76}
  77
  78/* the timer is primarily to kick this socket's pccardd */
  79static void electra_cf_timer(unsigned long _cf)
  80{
  81        struct electra_cf_socket *cf = (void *) _cf;
  82        int present = electra_cf_present(cf);
  83
  84        if (present != cf->present) {
  85                cf->present = present;
  86                pcmcia_parse_events(&cf->socket, SS_DETECT);
  87        }
  88
  89        if (cf->active)
  90                mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
  91}
  92
  93static irqreturn_t electra_cf_irq(int irq, void *_cf)
  94{
  95        electra_cf_timer((unsigned long)_cf);
  96        return IRQ_HANDLED;
  97}
  98
  99static int electra_cf_get_status(struct pcmcia_socket *s, u_int *sp)
 100{
 101        struct electra_cf_socket *cf;
 102
 103        if (!sp)
 104                return -EINVAL;
 105
 106        cf = container_of(s, struct electra_cf_socket, socket);
 107
 108        /* NOTE CF is always 3VCARD */
 109        if (electra_cf_present(cf)) {
 110                *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
 111
 112                s->pci_irq = cf->irq;
 113        } else
 114                *sp = 0;
 115        return 0;
 116}
 117
 118static int electra_cf_set_socket(struct pcmcia_socket *sock,
 119                                 struct socket_state_t *s)
 120{
 121        unsigned int gpio;
 122        unsigned int vcc;
 123        struct electra_cf_socket *cf;
 124
 125        cf = container_of(sock, struct electra_cf_socket, socket);
 126
 127        /* "reset" means no power in our case */
 128        vcc = (s->flags & SS_RESET) ? 0 : s->Vcc;
 129
 130        switch (vcc) {
 131        case 0:
 132                gpio = 0;
 133                break;
 134        case 33:
 135                gpio = (1 << cf->gpio_3v);
 136                break;
 137        case 5:
 138                gpio = (1 << cf->gpio_5v);
 139                break;
 140        default:
 141                return -EINVAL;
 142        }
 143
 144        gpio |= 1 << (cf->gpio_3v + 16); /* enwr */
 145        gpio |= 1 << (cf->gpio_5v + 16); /* enwr */
 146        out_le32(cf->gpio_base+0x90, gpio);
 147
 148        pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
 149                driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
 150
 151        return 0;
 152}
 153
 154static int electra_cf_set_io_map(struct pcmcia_socket *s,
 155                                 struct pccard_io_map *io)
 156{
 157        return 0;
 158}
 159
 160static int electra_cf_set_mem_map(struct pcmcia_socket *s,
 161                                  struct pccard_mem_map *map)
 162{
 163        struct electra_cf_socket *cf;
 164
 165        if (map->card_start)
 166                return -EINVAL;
 167        cf = container_of(s, struct electra_cf_socket, socket);
 168        map->static_start = cf->mem_phys;
 169        map->flags &= MAP_ACTIVE|MAP_ATTRIB;
 170        if (!(map->flags & MAP_ATTRIB))
 171                map->static_start += 0x800;
 172        return 0;
 173}
 174
 175static struct pccard_operations electra_cf_ops = {
 176        .init                   = electra_cf_ss_init,
 177        .get_status             = electra_cf_get_status,
 178        .set_socket             = electra_cf_set_socket,
 179        .set_io_map             = electra_cf_set_io_map,
 180        .set_mem_map            = electra_cf_set_mem_map,
 181};
 182
 183static int __devinit electra_cf_probe(struct of_device *ofdev,
 184                                      const struct of_device_id *match)
 185{
 186        struct device *device = &ofdev->dev;
 187        struct device_node *np = ofdev->node;
 188        struct electra_cf_socket   *cf;
 189        struct resource mem, io;
 190        int status;
 191        const unsigned int *prop;
 192        int err;
 193        struct vm_struct *area;
 194
 195        err = of_address_to_resource(np, 0, &mem);
 196        if (err)
 197                return -EINVAL;
 198
 199        err = of_address_to_resource(np, 1, &io);
 200        if (err)
 201                return -EINVAL;
 202
 203        cf = kzalloc(sizeof *cf, GFP_KERNEL);
 204        if (!cf)
 205                return -ENOMEM;
 206
 207        setup_timer(&cf->timer, electra_cf_timer, (unsigned long)cf);
 208        cf->irq = NO_IRQ;
 209
 210        cf->ofdev = ofdev;
 211        cf->mem_phys = mem.start;
 212        cf->mem_size = PAGE_ALIGN(mem.end - mem.start);
 213        cf->mem_base = ioremap(cf->mem_phys, cf->mem_size);
 214        cf->io_size = PAGE_ALIGN(io.end - io.start);
 215
 216        area = __get_vm_area(cf->io_size, 0, PHB_IO_BASE, PHB_IO_END);
 217        if (area == NULL)
 218                return -ENOMEM;
 219
 220        cf->io_virt = (void __iomem *)(area->addr);
 221
 222        cf->gpio_base = ioremap(0xfc103000, 0x1000);
 223        dev_set_drvdata(device, cf);
 224
 225        if (!cf->mem_base || !cf->io_virt || !cf->gpio_base ||
 226            (__ioremap_at(io.start, cf->io_virt, cf->io_size,
 227                _PAGE_NO_CACHE | _PAGE_GUARDED) == NULL)) {
 228                dev_err(device, "can't ioremap ranges\n");
 229                status = -ENOMEM;
 230                goto fail1;
 231        }
 232
 233
 234        cf->io_base = (unsigned long)cf->io_virt - VMALLOC_END;
 235
 236        cf->iomem.start = (unsigned long)cf->mem_base;
 237        cf->iomem.end = (unsigned long)cf->mem_base + (mem.end - mem.start);
 238        cf->iomem.flags = IORESOURCE_MEM;
 239
 240        cf->irq = irq_of_parse_and_map(np, 0);
 241
 242        status = request_irq(cf->irq, electra_cf_irq, IRQF_SHARED,
 243                             driver_name, cf);
 244        if (status < 0) {
 245                dev_err(device, "request_irq failed\n");
 246                goto fail1;
 247        }
 248
 249        cf->socket.pci_irq = cf->irq;
 250
 251        prop = of_get_property(np, "card-detect-gpio", NULL);
 252        if (!prop)
 253                goto fail1;
 254        cf->gpio_detect = *prop;
 255
 256        prop = of_get_property(np, "card-vsense-gpio", NULL);
 257        if (!prop)
 258                goto fail1;
 259        cf->gpio_vsense = *prop;
 260
 261        prop = of_get_property(np, "card-3v-gpio", NULL);
 262        if (!prop)
 263                goto fail1;
 264        cf->gpio_3v = *prop;
 265
 266        prop = of_get_property(np, "card-5v-gpio", NULL);
 267        if (!prop)
 268                goto fail1;
 269        cf->gpio_5v = *prop;
 270
 271        cf->socket.io_offset = cf->io_base;
 272
 273        /* reserve chip-select regions */
 274        if (!request_mem_region(cf->mem_phys, cf->mem_size, driver_name)) {
 275                status = -ENXIO;
 276                dev_err(device, "Can't claim memory region\n");
 277                goto fail1;
 278        }
 279
 280        if (!request_region(cf->io_base, cf->io_size, driver_name)) {
 281                status = -ENXIO;
 282                dev_err(device, "Can't claim I/O region\n");
 283                goto fail2;
 284        }
 285
 286        cf->socket.owner = THIS_MODULE;
 287        cf->socket.dev.parent = &ofdev->dev;
 288        cf->socket.ops = &electra_cf_ops;
 289        cf->socket.resource_ops = &pccard_static_ops;
 290        cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP |
 291                                SS_CAP_MEM_ALIGN;
 292        cf->socket.map_size = 0x800;
 293
 294        status = pcmcia_register_socket(&cf->socket);
 295        if (status < 0) {
 296                dev_err(device, "pcmcia_register_socket failed\n");
 297                goto fail3;
 298        }
 299
 300        dev_info(device, "at mem 0x%lx io 0x%lx irq %d\n",
 301                 cf->mem_phys, io.start, cf->irq);
 302
 303        cf->active = 1;
 304        electra_cf_timer((unsigned long)cf);
 305        return 0;
 306
 307fail3:
 308        release_region(cf->io_base, cf->io_size);
 309fail2:
 310        release_mem_region(cf->mem_phys, cf->mem_size);
 311fail1:
 312        if (cf->irq != NO_IRQ)
 313                free_irq(cf->irq, cf);
 314
 315        if (cf->io_virt)
 316                __iounmap_at(cf->io_virt, cf->io_size);
 317        if (cf->mem_base)
 318                iounmap(cf->mem_base);
 319        if (cf->gpio_base)
 320                iounmap(cf->gpio_base);
 321        device_init_wakeup(&ofdev->dev, 0);
 322        kfree(cf);
 323        return status;
 324
 325}
 326
 327static int __devexit electra_cf_remove(struct of_device *ofdev)
 328{
 329        struct device *device = &ofdev->dev;
 330        struct electra_cf_socket *cf;
 331
 332        cf = dev_get_drvdata(device);
 333
 334        cf->active = 0;
 335        pcmcia_unregister_socket(&cf->socket);
 336        free_irq(cf->irq, cf);
 337        del_timer_sync(&cf->timer);
 338
 339        __iounmap_at(cf->io_virt, cf->io_size);
 340        iounmap(cf->mem_base);
 341        iounmap(cf->gpio_base);
 342        release_mem_region(cf->mem_phys, cf->mem_size);
 343        release_region(cf->io_base, cf->io_size);
 344
 345        kfree(cf);
 346
 347        return 0;
 348}
 349
 350static struct of_device_id electra_cf_match[] = {
 351        {
 352                .compatible   = "electra-cf",
 353        },
 354        {},
 355};
 356MODULE_DEVICE_TABLE(of, electra_cf_match);
 357
 358static struct of_platform_driver electra_cf_driver = {
 359        .name      = (char *)driver_name,
 360        .match_table    = electra_cf_match,
 361        .probe    = electra_cf_probe,
 362        .remove   = electra_cf_remove,
 363};
 364
 365static int __init electra_cf_init(void)
 366{
 367        return of_register_platform_driver(&electra_cf_driver);
 368}
 369module_init(electra_cf_init);
 370
 371static void __exit electra_cf_exit(void)
 372{
 373        of_unregister_platform_driver(&electra_cf_driver);
 374}
 375module_exit(electra_cf_exit);
 376
 377MODULE_LICENSE("GPL");
 378MODULE_AUTHOR ("Olof Johansson <olof@lixom.net>");
 379MODULE_DESCRIPTION("PA Semi Electra CF driver");
 380