drivers/pcmcia/bfin_cf_pcmcia.c

   1 /*
   2  * file: drivers/pcmcia/bfin_cf.c
   3  *
   4  * based on: drivers/pcmcia/omap_cf.c
   5  * omap_cf.c -- OMAP 16xx CompactFlash controller driver
   6  *
   7  * Copyright (c) 2005 David Brownell
   8  * Copyright (c) 2006-2008 Michael Hennerich Analog Devices Inc.
   9  *
  10  * bugs:         enter bugs at http://blackfin.uclinux.org/
  11  *
  12  * this program is free software; you can redistribute it and/or modify
  13  * it under the terms of the gnu general public license as published by
  14  * the free software foundation; either version 2, or (at your option)
  15  * any later version.
  16  *
  17  * this program is distributed in the hope that it will be useful,
  18  * but without any warranty; without even the implied warranty of
  19  * merchantability or fitness for a particular purpose.  see the
  20  * gnu general public license for more details.
  21  *
  22  * you should have received a copy of the gnu general public license
  23  * along with this program; see the file copying.
  24  * if not, write to the free software foundation,
  25  * 59 temple place - suite 330, boston, ma 02111-1307, usa.
  26  */
  27
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/sched.h>
  31 #include <linux/platform_device.h>
  32 #include <linux/errno.h>
  33 #include <linux/init.h>
  34 #include <linux/slab.h>
  35 #include <linux/delay.h>
  36 #include <linux/interrupt.h>
  37 #include <linux/irq.h>
  38 #include <linux/io.h>
  39 #include <linux/gpio.h>
  40
  41 #include <pcmcia/ss.h>
  42 #include <pcmcia/cisreg.h>
  43
  44 #define SZ_1K   0x00000400
  45 #define SZ_8K   0x00002000
  46 #define SZ_2K   (2 * SZ_1K)
  47
  48 #define POLL_INTERVAL   (2 * HZ)
  49
  50 #define CF_ATASEL_ENA   0x20311802      /* Inverts RESET */
  51 #define CF_ATASEL_DIS   0x20311800
  52
  53 #define bfin_cf_present(pfx) (gpio_get_value(pfx))
  54
  55 /*--------------------------------------------------------------------------*/
  56
  57 static const char driver_name[] = "bfin_cf_pcmcia";
  58
  59 struct bfin_cf_socket {
  60         struct pcmcia_socket socket;
  61
  62         struct timer_list timer;
  63         unsigned present:1;
  64         unsigned active:1;
  65
  66         struct platform_device *pdev;
  67         unsigned long phys_cf_io;
  68         unsigned long phys_cf_attr;
  69         u_int irq;
  70         u_short cd_pfx;
  71 };
  72
  73 /*--------------------------------------------------------------------------*/
  74 static int bfin_cf_reset(void)
  75 {
  76         outw(0, CF_ATASEL_ENA);
  77         mdelay(200);
  78         outw(0, CF_ATASEL_DIS);
  79
  80         return 0;
  81 }
  82
  83 static int bfin_cf_ss_init(struct pcmcia_socket *s)
  84 {
  85         return 0;
  86 }
  87
  88 /* the timer is primarily to kick this socket's pccardd */
  89 static void bfin_cf_timer(struct timer_list *t)
  90 {
  91         struct bfin_cf_socket *cf = from_timer(cf, t, timer);
  92         unsigned short present = bfin_cf_present(cf->cd_pfx);
  93
  94         if (present != cf->present) {
  95                 cf->present = present;
  96                 dev_dbg(&cf->pdev->dev, ": card %s\n",
  97                          present ? "present" : "gone");
  98                 pcmcia_parse_events(&cf->socket, SS_DETECT);
  99         }
 100
 101         if (cf->active)
 102                 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
 103 }
 104
 105 static int bfin_cf_get_status(struct pcmcia_socket *s, u_int *sp)
 106 {
 107         struct bfin_cf_socket *cf;
 108
 109         if (!sp)
 110                 return -EINVAL;
 111
 112         cf = container_of(s, struct bfin_cf_socket, socket);
 113
 114         if (bfin_cf_present(cf->cd_pfx)) {
 115                 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
 116                 s->pcmcia_irq = 0;
 117                 s->pci_irq = cf->irq;
 118
 119         } else
 120                 *sp = 0;
 121         return 0;
 122 }
 123
 124 static int
 125 bfin_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
 126 {
 127
 128         struct bfin_cf_socket *cf;
 129         cf = container_of(sock, struct bfin_cf_socket, socket);
 130
 131         switch (s->Vcc) {
 132         case 0:
 133         case 33:
 134                 break;
 135         case 50:
 136                 break;
 137         default:
 138                 return -EINVAL;
 139         }
 140
 141         if (s->flags & SS_RESET) {
 142                 disable_irq(cf->irq);
 143                 bfin_cf_reset();
 144                 enable_irq(cf->irq);
 145         }
 146
 147         dev_dbg(&cf->pdev->dev, ": Vcc %d, io_irq %d, flags %04x csc %04x\n",
 148                  s->Vcc, s->io_irq, s->flags, s->csc_mask);
 149
 150         return 0;
 151 }
 152
 153 static int bfin_cf_ss_suspend(struct pcmcia_socket *s)
 154 {
 155         return bfin_cf_set_socket(s, &dead_socket);
 156 }
 157
 158 /* regions are 2K each:  mem, attrib, io (and reserved-for-ide) */
 159
 160 static int bfin_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
 161 {
 162         struct bfin_cf_socket *cf;
 163
 164         cf = container_of(s, struct bfin_cf_socket, socket);
 165         io->flags &= MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT;
 166         io->start = cf->phys_cf_io;
 167         io->stop = io->start + SZ_2K - 1;
 168         return 0;
 169 }
 170
 171 static int
 172 bfin_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
 173 {
 174         struct bfin_cf_socket *cf;
 175
 176         if (map->card_start)
 177                 return -EINVAL;
 178         cf = container_of(s, struct bfin_cf_socket, socket);
 179         map->static_start = cf->phys_cf_io;
 180         map->flags &= MAP_ACTIVE | MAP_ATTRIB | MAP_16BIT;
 181         if (map->flags & MAP_ATTRIB)
 182                 map->static_start = cf->phys_cf_attr;
 183
 184         return 0;
 185 }
 186
 187 static struct pccard_operations bfin_cf_ops = {
 188         .init = bfin_cf_ss_init,
 189         .suspend = bfin_cf_ss_suspend,
 190         .get_status = bfin_cf_get_status,
 191         .set_socket = bfin_cf_set_socket,
 192         .set_io_map = bfin_cf_set_io_map,
 193         .set_mem_map = bfin_cf_set_mem_map,
 194 };
 195
 196 /*--------------------------------------------------------------------------*/
 197
 198 static int bfin_cf_probe(struct platform_device *pdev)
 199 {
 200         struct bfin_cf_socket *cf;
 201         struct resource *io_mem, *attr_mem;
 202         int irq;
 203         unsigned short cd_pfx;
 204         int status = 0;
 205
 206         dev_info(&pdev->dev, "Blackfin CompactFlash/PCMCIA Socket Driver\n");
 207
 208         irq = platform_get_irq(pdev, 0);
 209         if (irq <= 0)
 210                 return -EINVAL;
 211
 212         cd_pfx = platform_get_irq(pdev, 1);     /*Card Detect GPIO PIN */
 213
 214         if (gpio_request(cd_pfx, "pcmcia: CD")) {
 215                 dev_err(&pdev->dev,
 216                        "Failed ro request Card Detect GPIO_%d\n",
 217                        cd_pfx);
 218                 return -EBUSY;
 219         }
 220         gpio_direction_input(cd_pfx);
 221
 222         cf = kzalloc(sizeof *cf, GFP_KERNEL);
 223         if (!cf) {
 224                 gpio_free(cd_pfx);
 225                 return -ENOMEM;
 226         }
 227
 228         cf->cd_pfx = cd_pfx;
 229
 230         timer_setup(&cf->timer, bfin_cf_timer, 0);
 231
 232         cf->pdev = pdev;
 233         platform_set_drvdata(pdev, cf);
 234
 235         cf->irq = irq;
 236         cf->socket.pci_irq = irq;
 237
 238         irq_set_irq_type(irq, IRQF_TRIGGER_LOW);
 239
 240         io_mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 241         attr_mem = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 242
 243         if (!io_mem || !attr_mem)
 244                 goto fail0;
 245
 246         cf->phys_cf_io = io_mem->start;
 247         cf->phys_cf_attr = attr_mem->start;
 248
 249         /* pcmcia layer only remaps "real" memory */
 250         cf->socket.io_offset = (unsigned long)
 251             ioremap(cf->phys_cf_io, SZ_2K);
 252
 253         if (!cf->socket.io_offset)
 254                 goto fail0;
 255
 256         dev_err(&pdev->dev, ": on irq %d\n", irq);
 257
 258         dev_dbg(&pdev->dev, ": %s\n",
 259                  bfin_cf_present(cf->cd_pfx) ? "present" : "(not present)");
 260
 261         cf->socket.owner = THIS_MODULE;
 262         cf->socket.dev.parent = &pdev->dev;
 263         cf->socket.ops = &bfin_cf_ops;
 264         cf->socket.resource_ops = &pccard_static_ops;
 265         cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
 266             | SS_CAP_MEM_ALIGN;
 267         cf->socket.map_size = SZ_2K;
 268
 269         status = pcmcia_register_socket(&cf->socket);
 270         if (status < 0)
 271                 goto fail2;
 272
 273         cf->active = 1;
 274         mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
 275         return 0;
 276
 277 fail2:
 278         iounmap((void __iomem *)cf->socket.io_offset);
 279         release_mem_region(cf->phys_cf_io, SZ_8K);
 280
 281 fail0:
 282         gpio_free(cf->cd_pfx);
 283         kfree(cf);
 284         platform_set_drvdata(pdev, NULL);
 285
 286         return status;
 287 }
 288
 289 static int bfin_cf_remove(struct platform_device *pdev)
 290 {
 291         struct bfin_cf_socket *cf = platform_get_drvdata(pdev);
 292
 293         gpio_free(cf->cd_pfx);
 294         cf->active = 0;
 295         pcmcia_unregister_socket(&cf->socket);
 296         del_timer_sync(&cf->timer);
 297         iounmap((void __iomem *)cf->socket.io_offset);
 298         release_mem_region(cf->phys_cf_io, SZ_8K);
 299         platform_set_drvdata(pdev, NULL);
 300         kfree(cf);
 301         return 0;
 302 }
 303
 304 static struct platform_driver bfin_cf_driver = {
 305         .driver = {
 306                    .name = driver_name,
 307                    },
 308         .probe = bfin_cf_probe,
 309         .remove = bfin_cf_remove,
 310 };
 311
 312 module_platform_driver(bfin_cf_driver);
 313
 314 MODULE_AUTHOR("Michael Hennerich <hennerich@blackfin.uclinux.org>");
 315 MODULE_DESCRIPTION("BFIN CF/PCMCIA Driver");
 316 MODULE_LICENSE("GPL");