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 <asm/hardware.h>
  23 #include <asm/io.h>
  24 #include <asm/sizes.h>
  25
  26 #include <asm/arch/mux.h>
  27 #include <asm/arch/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_REG           __REG16(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_REG              __REG16(CF_BASE + 0x02)
  48
  49 /* card reset */
  50 #define CF_CONTROL_REG          __REG16(CF_BASE + 0x04)
  51 #       define  CF_CONTROL_RESET        (1 << 0)
  52
  53 #define omap_cf_present() (!(CF_STATUS_REG & 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 #define SZ_2K                   (2 * SZ_1K)
  75
  76 /*--------------------------------------------------------------------------*/
  77
  78 static int omap_cf_ss_init(struct pcmcia_socket *s)
  79 {
  80         return 0;
  81 }
  82
  83 /* the timer is primarily to kick this socket's pccardd */
  84 static void omap_cf_timer(unsigned long _cf)
  85 {
  86         struct omap_cf_socket   *cf = (void *) _cf;
  87         unsigned                present = omap_cf_present();
  88
  89         if (present != cf->present) {
  90                 cf->present = present;
  91                 pr_debug("%s: card %s\n", driver_name,
  92                         present ? "present" : "gone");
  93                 pcmcia_parse_events(&cf->socket, SS_DETECT);
  94         }
  95
  96         if (cf->active)
  97                 mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
  98 }
  99
 100 /* This irq handler prevents "irqNNN: nobody cared" messages as drivers
 101  * claim the card's IRQ.  It may also detect some card insertions, but
 102  * not removals; it can't always eliminate timer irqs.
 103  */
 104 static irqreturn_t omap_cf_irq(int irq, void *_cf)
 105 {
 106         omap_cf_timer((unsigned long)_cf);
 107         return IRQ_HANDLED;
 108 }
 109
 110 static int omap_cf_get_status(struct pcmcia_socket *s, u_int *sp)
 111 {
 112         if (!sp)
 113                 return -EINVAL;
 114
 115         /* NOTE CF is always 3VCARD */
 116         if (omap_cf_present()) {
 117                 struct omap_cf_socket   *cf;
 118
 119                 *sp = SS_READY | SS_DETECT | SS_POWERON | SS_3VCARD;
 120                 cf = container_of(s, struct omap_cf_socket, socket);
 121                 s->irq.AssignedIRQ = 0;
 122                 s->pci_irq = cf->irq;
 123         } else
 124                 *sp = 0;
 125         return 0;
 126 }
 127
 128 static int
 129 omap_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
 130 {
 131         u16             control;
 132
 133         /* REVISIT some non-OSK boards may support power switching */
 134         switch (s->Vcc) {
 135         case 0:
 136         case 33:
 137                 break;
 138         default:
 139                 return -EINVAL;
 140         }
 141
 142         control = CF_CONTROL_REG;
 143         if (s->flags & SS_RESET)
 144                 CF_CONTROL_REG = CF_CONTROL_RESET;
 145         else
 146                 CF_CONTROL_REG = 0;
 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
 154 static int omap_cf_ss_suspend(struct pcmcia_socket *s)
 155 {
 156         pr_debug("%s: %s\n", driver_name, __FUNCTION__);
 157         return omap_cf_set_socket(s, &dead_socket);
 158 }
 159
 160 /* regions are 2K each:  mem, attrib, io (and reserved-for-ide) */
 161
 162 static int
 163 omap_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
 164 {
 165         struct omap_cf_socket   *cf;
 166
 167         cf = container_of(s, struct omap_cf_socket, socket);
 168         io->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
 169         io->start = cf->phys_cf + SZ_4K;
 170         io->stop = io->start + SZ_2K - 1;
 171         return 0;
 172 }
 173
 174 static int
 175 omap_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
 176 {
 177         struct omap_cf_socket   *cf;
 178
 179         if (map->card_start)
 180                 return -EINVAL;
 181         cf = container_of(s, struct omap_cf_socket, socket);
 182         map->static_start = cf->phys_cf;
 183         map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
 184         if (map->flags & MAP_ATTRIB)
 185                 map->static_start += SZ_2K;
 186         return 0;
 187 }
 188
 189 static struct pccard_operations omap_cf_ops = {
 190         .init                   = omap_cf_ss_init,
 191         .suspend                = omap_cf_ss_suspend,
 192         .get_status             = omap_cf_get_status,
 193         .set_socket             = omap_cf_set_socket,
 194         .set_io_map             = omap_cf_set_io_map,
 195         .set_mem_map            = omap_cf_set_mem_map,
 196 };
 197
 198 /*--------------------------------------------------------------------------*/
 199
 200 /*
 201  * NOTE:  right now the only board-specific platform_data is
 202  * "what chipselect is used".  Boards could want more.
 203  */
 204
 205 static int __devinit omap_cf_probe(struct device *dev)
 206 {
 207         unsigned                seg;
 208         struct omap_cf_socket   *cf;
 209         struct platform_device  *pdev = to_platform_device(dev);
 210         int                     irq;
 211         int                     status;
 212
 213         seg = (int) 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         init_timer(&cf->timer);
 226         cf->timer.function = omap_cf_timer;
 227         cf->timer.data = (unsigned long) cf;
 228
 229         cf->pdev = pdev;
 230         dev_set_drvdata(dev, cf);
 231
 232         /* this primarily just shuts up irq handling noise */
 233         status = request_irq(irq, omap_cf_irq, IRQF_SHARED,
 234                         driver_name, cf);
 235         if (status < 0)
 236                 goto fail0;
 237         cf->irq = irq;
 238         cf->socket.pci_irq = irq;
 239
 240         switch (seg) {
 241         /* NOTE: CS0 could be configured too ... */
 242         case 1:
 243                 cf->phys_cf = OMAP_CS1_PHYS;
 244                 break;
 245         case 2:
 246                 cf->phys_cf = OMAP_CS2_PHYS;
 247                 break;
 248         case 3:
 249                 cf->phys_cf = omap_cs3_phys();
 250                 break;
 251         default:
 252                 goto  fail1;
 253         }
 254         cf->iomem.start = cf->phys_cf;
 255         cf->iomem.end = cf->iomem.end + SZ_8K - 1;
 256         cf->iomem.flags = IORESOURCE_MEM;
 257
 258         /* pcmcia layer only remaps "real" memory */
 259         cf->socket.io_offset = (unsigned long)
 260                         ioremap(cf->phys_cf + SZ_4K, SZ_2K);
 261         if (!cf->socket.io_offset)
 262                 goto fail1;
 263
 264         if (!request_mem_region(cf->phys_cf, SZ_8K, driver_name))
 265                 goto fail1;
 266
 267         /* NOTE:  CF conflicts with MMC1 */
 268         omap_cfg_reg(W11_1610_CF_CD1);
 269         omap_cfg_reg(P11_1610_CF_CD2);
 270         omap_cfg_reg(R11_1610_CF_IOIS16);
 271         omap_cfg_reg(V10_1610_CF_IREQ);
 272         omap_cfg_reg(W10_1610_CF_RESET);
 273
 274         CF_CFG_REG = ~(1 << seg);
 275
 276         pr_info("%s: cs%d on irq %d\n", driver_name, seg, irq);
 277
 278         /* NOTE:  better EMIFS setup might support more cards; but the
 279          * TRM only shows how to affect regular flash signals, not their
 280          * CF/PCMCIA variants...
 281          */
 282         pr_debug("%s: cs%d, previous ccs %08x acs %08x\n", driver_name,
 283                         seg, EMIFS_CCS(seg), EMIFS_ACS(seg));
 284         EMIFS_CCS(seg) = 0x0004a1b3;    /* synch mode 4 etc */
 285         EMIFS_ACS(seg) = 0x00000000;    /* OE hold/setup */
 286
 287         /* CF uses armxor_ck, which is "always" available */
 288
 289         pr_debug("%s: sts %04x cfg %04x control %04x %s\n", driver_name,
 290                 CF_STATUS_REG, CF_CFG_REG, CF_CONTROL_REG,
 291                 omap_cf_present() ? "present" : "(not present)");
 292
 293         cf->socket.owner = THIS_MODULE;
 294         cf->socket.dev.dev = dev;
 295         cf->socket.ops = &omap_cf_ops;
 296         cf->socket.resource_ops = &pccard_static_ops;
 297         cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
 298                                 | SS_CAP_MEM_ALIGN;
 299         cf->socket.map_size = SZ_2K;
 300         cf->socket.io[0].res = &cf->iomem;
 301
 302         status = pcmcia_register_socket(&cf->socket);
 303         if (status < 0)
 304                 goto fail2;
 305
 306         cf->active = 1;
 307         mod_timer(&cf->timer, jiffies + POLL_INTERVAL);
 308         return 0;
 309
 310 fail2:
 311         release_mem_region(cf->phys_cf, SZ_8K);
 312 fail1:
 313         if (cf->socket.io_offset)
 314                 iounmap((void __iomem *) cf->socket.io_offset);
 315         free_irq(irq, cf);
 316 fail0:
 317         kfree(cf);
 318         return status;
 319 }
 320
 321 static int __devexit omap_cf_remove(struct device *dev)
 322 {
 323         struct omap_cf_socket *cf = dev_get_drvdata(dev);
 324
 325         cf->active = 0;
 326         pcmcia_unregister_socket(&cf->socket);
 327         del_timer_sync(&cf->timer);
 328         iounmap((void __iomem *) cf->socket.io_offset);
 329         release_mem_region(cf->phys_cf, SZ_8K);
 330         free_irq(cf->irq, cf);
 331         kfree(cf);
 332         return 0;
 333 }
 334
 335 static struct device_driver omap_cf_driver = {
 336         .name           = (char *) driver_name,
 337         .bus            = &platform_bus_type,
 338         .probe          = omap_cf_probe,
 339         .remove         = __devexit_p(omap_cf_remove),
 340         .suspend        = pcmcia_socket_dev_suspend,
 341         .resume         = pcmcia_socket_dev_resume,
 342 };
 343
 344 static int __init omap_cf_init(void)
 345 {
 346         if (cpu_is_omap16xx())
 347                 return driver_register(&omap_cf_driver);
 348         return -ENODEV;
 349 }
 350
 351 static void __exit omap_cf_exit(void)
 352 {
 353         if (cpu_is_omap16xx())
 354                 driver_unregister(&omap_cf_driver);
 355 }
 356
 357 module_init(omap_cf_init);
 358 module_exit(omap_cf_exit);
 359
 360 MODULE_DESCRIPTION("OMAP CF Driver");
 361 MODULE_LICENSE("GPL");