drivers/pcmcia/omap_cf.c

   1 /*
   2  * omap_cf.c -- OMAP 16xx 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/delay.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/slab.h>
  20
  21 #include <pcmcia/ss.h>
  22
  23 #include <mach/hardware.h>
  24 #include <asm/io.h>
  25 #include <asm/sizes.h>
  26
  27 #include <mach/mux.h>
  28 #include <mach/tc.h>
  29
  30
  31 /* NOTE:  don't expect this to support many I/O cards.  The 16xx chips have
  32  * hard-wired timings to support Compact Flash memory cards; they won't work
  33  * with various other devices (like WLAN adapters) without some external
  34  * logic to help out.
  35  *
  36  * NOTE:  CF controller docs disagree with address space docs as to where
  37  * CF_BASE really lives; this is a doc erratum.
  38  */
  39 #define CF_BASE 0xfffe2800
  40
  41 /* status; read after IRQ */
  42 #define CF_STATUS                       (CF_BASE + 0x00)
  43 #       define  CF_STATUS_BAD_READ      (1 << 2)
  44 #       define  CF_STATUS_BAD_WRITE     (1 << 1)
  45 #       define  CF_STATUS_CARD_DETECT   (1 << 0)
  46
  47 /* which chipselect (CS0..CS3) is used for CF (active low) */
  48 #define CF_CFG                          (CF_BASE + 0x02)
  49
  50 /* card reset */
  51 #define CF_CONTROL                      (CF_BASE + 0x04)
  52 #       define  CF_CONTROL_RESET        (1 << 0)
  53
  54 #define omap_cf_present() (!(omap_readw(CF_STATUS) & CF_STATUS_CARD_DETECT))
  55
  56 /*--------------------------------------------------------------------------*/
  57
  58 static const char driver_name[] = "omap_cf";
  59
  60 struct omap_cf_socket {
  61         struct pcmcia_socket    socket;
  62
  63         struct timer_list       timer;
  64         unsigned                present:1;
  65         unsigned                active:1;
  66
  67         struct platform_device  *pdev;
  68         unsigned long           phys_cf;
  69         u_int                   irq;
  70         struct resource         iomem;
  71 };
  72
  73 #define POLL_INTERVAL           (2 * HZ)
  74
  75 /*--------------------------------------------------------------------------*/
  76
  77 static int omap_cf_ss_init(struct pcmcia_socket *s)
  78 {
  79         return 0;
  80 }
  81
  82 /* the timer is primarily to kick this socket's pccardd */
  83 static void omap_cf_timer(struct timer_list *t)
  84 {
  85         struct omap_cf_socket   *cf = from_timer(cf, t, timer);
  86         unsigned                present = omap_cf_present();
  87
  88         if (present != cf->present) {
  89                 cf->present = present;
  90                 pr_debug("%s: card %s\n", driver_name,
  91                         present ? "present" : "gone");
  92                 pcmcia_parse_events(&cf->socket, SS_DETECT);
  93         }
  94
  95         if (cf->active)
  96                 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
  97 }
  98
  99 /* This irq handler prevents "irqNNN: nobody cared" messages as drivers
 100  * claim the card's IRQ.  It may also detect some card insertions, but
 101  * not removals; it can't always eliminate timer irqs.
 102  */
 103 static irqreturn_t omap_cf_irq(int irq, void *_cf)
 104 {
 105         struct omap_cf_socket *cf = (struct omap_cf_socket *)_cf;
 106
 107         omap_cf_timer(&cf->timer);
 108         return IRQ_HANDLED;
 109 }
 110
 111 static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)
 112 {
 113         if (!sp)
 114                 return -EINVAL;
 115
 116         /* NOTE CF is always 3VCARD */
 117         if (omap_cf_present()) {
 118                 struct omap_cf_socket   *cf;
 119
 120                 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
 121                 cf = container_of(s, struct omap_cf_socket, socket);
 122                 s->pcmcia_irq = 0;
 123                 s->pci_irq = cf->irq;
 124         } else
 125                 *sp = 0;
 126         return 0;
 127 }
 128
 129 static int
 130 omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
 131 {
 132         u16             control;
 133
 134         /* REVISIT some non-OSK boards may support power switching */
 135         switch (s->Vcc) {
 136         case 0:
 137         case 33:
 138                 break;
 139         default:
 140                 return -EINVAL;
 141         }
 142
 143         control = omap_readw(CF_CONTROL);
 144         if (s->flags & SS_RESET)
 145                 omap_writew(CF_CONTROL_RESET, CF_CONTROL);
 146         else
 147                 omap_writew(0, CF_CONTROL);
 148
 149         pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
 150                 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
 151
 152         return 0;
 153 }
 154
 155 static int omap_cf_ss_suspend(struct pcmcia_socket *s)
 156 {
 157         pr_debug("%s: %s\n", driver_name, __func__);
 158         return omap_cf_set_socket(s, &dead_socket);
 159 }
 160
 161 /* regions are 2K each:  mem, attrib, io (and reserved-for-ide) */
 162
 163 static int
 164 omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
 165 {
 166         struct omap_cf_socket   *cf;
 167
 168         cf = container_of(s, struct omap_cf_socket, socket);
 169         io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
 170         io->start = cf->phys_cf + SZ_4K;
 171         io->stop = io->start + SZ_2K - 1;
 172         return 0;
 173 }
 174
 175 static int
 176 omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
 177 {
 178         struct omap_cf_socket   *cf;
 179
 180         if (map->card_start)
 181                 return -EINVAL;
 182         cf = container_of(s, struct omap_cf_socket, socket);
 183         map->static_start = cf->phys_cf;
 184         map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
 185         if (map->flags & MAP_ATTRIB)
 186                 map->static_start += SZ_2K;
 187         return 0;
 188 }
 189
 190 static struct pccard_operations omap_cf_ops = {
 191         .init                   = omap_cf_ss_init,
 192         .suspend                = omap_cf_ss_suspend,
 193         .get_status             = omap_cf_get_status,
 194         .set_socket             = omap_cf_set_socket,
 195         .set_io_map             = omap_cf_set_io_map,
 196         .set_mem_map            = omap_cf_set_mem_map,
 197 };
 198
 199 /*--------------------------------------------------------------------------*/
 200
 201 /*
 202  * NOTE:  right now the only board-specific platform_data is
 203  * "what chipselect is used".  Boards could want more.
 204  */
 205
 206 static int __init omap_cf_probe(struct platform_device *pdev)
 207 {
 208         unsigned                seg;
 209         struct omap_cf_socket   *cf;
 210         int                     irq;
 211         int                     status;
 212
 213         seg = (int) pdev->dev.platform_data;
 214         if (seg == 0 || seg > 3)
 215                 return -ENODEV;
 216
 217         /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
 218         irq = platform_get_irq(pdev, 0);
 219         if (irq < 0)
 220                 return -EINVAL;
 221
 222         cf = kzalloc(sizeof *cf, GFP_KERNEL);
 223         if (!cf)
 224                 return -ENOMEM;
 225         timer_setup(&cf->timer, omap_cf_timer, 0);
 226
 227         cf->pdev = pdev;
 228         platform_set_drvdata(pdev, cf);
 229
 230         /* this primarily just shuts up irq handling noise */
 231         status = request_irq(irq, omap_cf_irq, IRQF_SHARED,
 232                         driver_name, cf);
 233         if (status < 0)
 234                 goto fail0;
 235         cf->irq = irq;
 236         cf->socket.pci_irq = irq;
 237
 238         switch (seg) {
 239         /* NOTE: CS0 could be configured too ... */
 240         case 1:
 241                 cf->phys_cf = OMAP_CS1_PHYS;
 242                 break;
 243         case 2:
 244                 cf->phys_cf = OMAP_CS2_PHYS;
 245                 break;
 246         case 3:
 247                 cf->phys_cf = omap_cs3_phys();
 248                 break;
 249         default:
 250                 goto  fail1;
 251         }
 252         cf->iomem.start = cf->phys_cf;
 253         cf->iomem.end = cf->iomem.end + SZ_8K - 1;
 254         cf->iomem.flags = IORESOURCE_MEM;
 255
 256         /* pcmcia layer only remaps "real" memory */
 257         cf->socket.io_offset = (unsigned long)
 258                         ioremap(cf->phys_cf + SZ_4K, SZ_2K);
 259         if (!cf->socket.io_offset)
 260                 goto fail1;
 261
 262         if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name))
 263                 goto fail1;
 264
 265         /* NOTE:  CF conflicts with MMC1 */
 266         omap_cfg_reg(W11_1610_CF_CD1);
 267         omap_cfg_reg(P11_1610_CF_CD2);
 268         omap_cfg_reg(R11_1610_CF_IOIS16);
 269         omap_cfg_reg(V10_1610_CF_IREQ);
 270         omap_cfg_reg(W10_1610_CF_RESET);
 271
 272         omap_writew(~(1 << seg), CF_CFG);
 273
 274         pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);
 275
 276         /* NOTE:  better EMIFS setup might support more cards; but the
 277          * TRM only shows how to affect regular flash signals, not their
 278          * CF/PCMCIA variants...
 279          */
 280         pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name,
 281                 seg, omap_readl(EMIFS_CCS(seg)), omap_readl(EMIFS_ACS(seg)));
 282         omap_writel(0x0004a1b3, EMIFS_CCS(seg));        /* synch mode 4 etc */
 283         omap_writel(0x00000000, EMIFS_ACS(seg));        /* OE hold/setup */
 284
 285         /* CF uses armxor_ck, which is "always" available */
 286
 287         pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
 288                 omap_readw(CF_STATUS), omap_readw(CF_CFG),
 289                 omap_readw(CF_CONTROL),
 290                 omap_cf_present() ? "present" : "(not present)");
 291
 292         cf->socket.owner = THIS_MODULE;
 293         cf->socket.dev.parent = &pdev->dev;
 294         cf->socket.ops = &omap_cf_ops;
 295         cf->socket.resource_ops = &pccard_static_ops;
 296         cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
 297                                 | SS_CAP_MEM_ALIGN;
 298         cf->socket.map_size = SZ_2K;
 299         cf->socket.io[0].res = &cf->iomem;
 300
 301         status = pcmcia_register_socket(&cf->socket);
 302         if (status < 0)
 303                 goto fail2;
 304
 305         cf->active = 1;
 306         mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
 307         return 0;
 308
 309 fail2:
 310         release_mem_region(cf->phys_cf, SZ_8K);
 311 fail1:
 312         if (cf->socket.io_offset)
 313                 iounmap((void __iomem *) cf->socket.io_offset);
 314         free_irq(irq, cf);
 315 fail0:
 316         kfree(cf);
 317         return status;
 318 }
 319
 320 static int __exit omap_cf_remove(struct platform_device *pdev)
 321 {
 322         struct omap_cf_socket *cf = platform_get_drvdata(pdev);
 323
 324         cf->active = 0;
 325         pcmcia_unregister_socket(&cf->socket);
 326         del_timer_sync(&cf->timer);
 327         iounmap((void __iomem *) cf->socket.io_offset);
 328         release_mem_region(cf->phys_cf, SZ_8K);
 329         free_irq(cf->irq, cf);
 330         kfree(cf);
 331         return 0;
 332 }
 333
 334 static struct platform_driver omap_cf_driver = {
 335         .driver = {
 336                 .name   = (char *) driver_name,
 337         },
 338         .remove         = __exit_p(omap_cf_remove),
 339 };
 340
 341 static int __init omap_cf_init(void)
 342 {
 343         if (cpu_is_omap16xx())
 344                 return platform_driver_probe(&omap_cf_driver, omap_cf_probe);
 345         return -ENODEV;
 346 }
 347
 348 static void __exit omap_cf_exit(void)
 349 {
 350         if (cpu_is_omap16xx())
 351                 platform_driver_unregister(&omap_cf_driver);
 352 }
 353
 354 module_init(omap_cf_init);
 355 module_exit(omap_cf_exit);
 356
 357 MODULE_DESCRIPTION("OMAP CF Driver");
 358 MODULE_LICENSE("GPL");
 359 MODULE_ALIAS("platform:omap_cf");