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