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/sched.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/errno.h>
  17 #include <linux/init.h>
  18 #include <linux/delay.h>
  19 #include <linux/interrupt.h>
  20
  21 #include <pcmcia/ss.h>
  22
  23 #include <asm/hardware.h>
  24 #include <asm/io.h>
  25 #include <asm/sizes.h>
  26
  27 #include <asm/arch/mux.h>
  28 #include <asm/arch/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_REG           __REG16(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_REG              __REG16(CF_BASE + 0x02)
  49
  50 /* card reset */
  51 #define CF_CONTROL_REG          __REG16(CF_BASE + 0x04)
  52 #       define  CF_CONTROL_RESET        (1 << 0)
  53
  54 #define omap_cf_present() (!(CF_STATUS_REG & 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 #define SZ_2K                   (2 * SZ_1K)
  76
  77 /*--------------------------------------------------------------------------*/
  78
  79 static int omap_cf_ss_init(struct pcmcia_socket *s)
  80 {
  81         return 0;
  82 }
  83
  84 /* the timer is primarily to kick this socket's pccardd */
  85 static void omap_cf_timer(unsigned long _cf)
  86 {
  87         struct omap_cf_socket   *cf = (void *) _cf;
  88         unsigned                present = omap_cf_present();
  89
  90         if (present != cf->present) {
  91                 cf->present = present;
  92                 pr_debug("%s: card %s\n", driver_name,
  93                         present ? "present" : "gone");
  94                 pcmcia_parse_events(&cf->socket, SS_DETECT);
  95         }
  96
  97         if (cf->active)
  98                 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
  99 }
 100
 101 /* This irq handler prevents "irqNNN: nobody cared" messages as drivers
 102  * claim the card's IRQ.  It may also detect some card insertions, but
 103  * not removals; it can't always eliminate timer irqs.
 104  */
 105 static irqreturn_t omap_cf_irq(int irq, void *_cf)
 106 {
 107         omap_cf_timer((unsigned long)_cf);
 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->irq.AssignedIRQ = 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 = CF_CONTROL_REG;
 144         if (s->flags & SS_RESET)
 145                 CF_CONTROL_REG = CF_CONTROL_RESET;
 146         else
 147                 CF_CONTROL_REG = 0;
 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, __FUNCTION__);
 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 __devinit omap_cf_probe(struct device *dev)
 207 {
 208         unsigned                seg;
 209         struct omap_cf_socket   *cf;
 210         struct platform_device  *pdev = to_platform_device(dev);
 211         int                     irq;
 212         int                     status;
 213
 214         seg = (int) dev->platform_data;
 215         if (seg == 0 || seg > 3)
 216                 return -ENODEV;
 217
 218         /* either CFLASH.IREQ (INT_1610_CF) or some GPIO */
 219         irq = platform_get_irq(pdev, 0);
 220         if (irq < 0)
 221                 return -EINVAL;
 222
 223         cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
 224         if (!cf)
 225                 return -ENOMEM;
 226         init_timer(&cf->timer);
 227         cf->timer.function = omap_cf_timer;
 228         cf->timer.data = (unsigned long) cf;
 229
 230         cf->pdev = pdev;
 231         dev_set_drvdata(dev, cf);
 232
 233         /* this primarily just shuts up irq handling noise */
 234         status = request_irq(irq, omap_cf_irq, IRQF_SHARED,
 235                         driver_name, cf);
 236         if (status < 0)
 237                 goto fail0;
 238         cf->irq = irq;
 239         cf->socket.pci_irq = irq;
 240
 241         switch (seg) {
 242         /* NOTE: CS0 could be configured too ... */
 243         case 1:
 244                 cf->phys_cf = OMAP_CS1_PHYS;
 245                 break;
 246         case 2:
 247                 cf->phys_cf = OMAP_CS2_PHYS;
 248                 break;
 249         case 3:
 250                 cf->phys_cf = omap_cs3_phys();
 251                 break;
 252         default:
 253                 goto  fail1;
 254         }
 255         cf->iomem.start = cf->phys_cf;
 256         cf->iomem.end = cf->iomem.end + SZ_8K - 1;
 257         cf->iomem.flags = IORESOURCE_MEM;
 258
 259         /* pcmcia layer only remaps "real" memory */
 260         cf->socket.io_offset = (unsigned long)
 261                         ioremap(cf->phys_cf + SZ_4K, SZ_2K);
 262         if (!cf->socket.io_offset)
 263                 goto fail1;
 264
 265         if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name))
 266                 goto fail1;
 267
 268         /* NOTE:  CF conflicts with MMC1 */
 269         omap_cfg_reg(W11_1610_CF_CD1);
 270         omap_cfg_reg(P11_1610_CF_CD2);
 271         omap_cfg_reg(R11_1610_CF_IOIS16);
 272         omap_cfg_reg(V10_1610_CF_IREQ);
 273         omap_cfg_reg(W10_1610_CF_RESET);
 274
 275         CF_CFG_REG = ~(1 << seg);
 276
 277         pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);
 278
 279         /* NOTE:  better EMIFS setup might support more cards; but the
 280          * TRM only shows how to affect regular flash signals, not their
 281          * CF/PCMCIA variants...
 282          */
 283         pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name,
 284                         seg, EMIFS_CCS(seg), EMIFS_ACS(seg));
 285         EMIFS_CCS(seg) = 0x0004a1b3;    /* synch mode 4 etc */
 286         EMIFS_ACS(seg) = 0x00000000;    /* OE hold/setup */
 287
 288         /* CF uses armxor_ck, which is "always" available */
 289
 290         pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
 291                 CF_STATUS_REG, CF_CFG_REG, CF_CONTROL_REG,
 292                 omap_cf_present() ? "present" : "(not present)");
 293
 294         cf->socket.owner = THIS_MODULE;
 295         cf->socket.dev.dev = dev;
 296         cf->socket.ops = &omap_cf_ops;
 297         cf->socket.resource_ops = &pccard_static_ops;
 298         cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
 299                                 | SS_CAP_MEM_ALIGN;
 300         cf->socket.map_size = SZ_2K;
 301         cf->socket.io[0].res = &cf->iomem;
 302
 303         status = pcmcia_register_socket(&cf->socket);
 304         if (status < 0)
 305                 goto fail2;
 306
 307         cf->active = 1;
 308         mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
 309         return 0;
 310
 311 fail2:
 312         release_mem_region(cf->phys_cf, SZ_8K);
 313 fail1:
 314         if (cf->socket.io_offset)
 315                 iounmap((void __iomem *) cf->socket.io_offset);
 316         free_irq(irq, cf);
 317 fail0:
 318         kfree(cf);
 319         return status;
 320 }
 321
 322 static int __devexit omap_cf_remove(struct device *dev)
 323 {
 324         struct omap_cf_socket *cf = dev_get_drvdata(dev);
 325
 326         cf->active = 0;
 327         pcmcia_unregister_socket(&cf->socket);
 328         del_timer_sync(&cf->timer);
 329         iounmap((void __iomem *) cf->socket.io_offset);
 330         release_mem_region(cf->phys_cf, SZ_8K);
 331         free_irq(cf->irq, cf);
 332         kfree(cf);
 333         return 0;
 334 }
 335
 336 static struct device_driver omap_cf_driver = {
 337         .name           = (char *) driver_name,
 338         .bus            = &platform_bus_type,
 339         .probe          = omap_cf_probe,
 340         .remove         = __devexit_p(omap_cf_remove),
 341         .suspend        = pcmcia_socket_dev_suspend,
 342         .resume         = pcmcia_socket_dev_resume,
 343 };
 344
 345 static int __init omap_cf_init(void)
 346 {
 347         if (cpu_is_omap16xx())
 348                 return driver_register(&omap_cf_driver);
 349         return -ENODEV;
 350 }
 351
 352 static void __exit omap_cf_exit(void)
 353 {
 354         if (cpu_is_omap16xx())
 355                 driver_unregister(&omap_cf_driver);
 356 }
 357
 358 module_init(omap_cf_init);
 359 module_exit(omap_cf_exit);
 360
 361 MODULE_DESCRIPTION("OMAP CF Driver");
 362 MODULE_LICENSE("GPL");