drivers/pcmcia/at91_cf.c

   1 /*
   2  * at91_cf.c -- AT91 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/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/at91rm9200.h>
  27 #include <asm/arch/board.h>
  28 #include <asm/arch/gpio.h>
  29
  30
  31 #define CF_SIZE         0x30000000      /* CS5+CS6: unavailable */
  32
  33 /*
  34  * A0..A10 work in each range; A23 indicates I/O space;  A25 is CFRNW;
  35  * some other bit in {A24,A22..A11} is nREG to flag memory access
  36  * (vs attributes).  So more than 2KB/region would just be waste.
  37  */
  38 #define CF_ATTR_PHYS    (AT91_CF_BASE)
  39 #define CF_IO_PHYS      (AT91_CF_BASE  + (1 << 23))
  40 #define CF_MEM_PHYS     (AT91_CF_BASE  + 0x017ff800)
  41
  42 /*--------------------------------------------------------------------------*/
  43
  44 static const char driver_name[] = "at91_cf";
  45
  46 struct at91_cf_socket {
  47         struct pcmcia_socket    socket;
  48
  49         unsigned                present:1;
  50
  51         struct platform_device  *pdev;
  52         struct at91_cf_data     *board;
  53 };
  54
  55 #define SZ_2K                   (2 * SZ_1K)
  56
  57 static inline int at91_cf_present(struct at91_cf_socket *cf)
  58 {
  59         return !at91_get_gpio_value(cf->board->det_pin);
  60 }
  61
  62 /*--------------------------------------------------------------------------*/
  63
  64 static int at91_cf_ss_init(struct pcmcia_socket *s)
  65 {
  66         return 0;
  67 }
  68
  69 static irqreturn_t at91_cf_irq(int irq, void *_cf, struct pt_regs *r)
  70 {
  71         struct at91_cf_socket   *cf = (struct at91_cf_socket *) _cf;
  72
  73         if (irq == cf->board->det_pin) {
  74                 unsigned present = at91_cf_present(cf);
  75
  76                 /* kick pccard as needed */
  77                 if (present != cf->present) {
  78                         cf->present = present;
  79                         pr_debug("%s: card %s\n", driver_name, present ? "present" : "gone");
  80                         pcmcia_parse_events(&cf->socket, SS_DETECT);
  81                 }
  82         }
  83
  84         return IRQ_HANDLED;
  85 }
  86
  87 static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
  88 {
  89         struct at91_cf_socket   *cf;
  90
  91         if (!sp)
  92                 return -EINVAL;
  93
  94         cf = container_of(s, struct at91_cf_socket, socket);
  95
  96         /* NOTE: we assume 3VCARD, not XVCARD...  */
  97         if (at91_cf_present(cf)) {
  98                 int rdy = cf->board->irq_pin;   /* RDY/nIRQ */
  99                 int vcc = cf->board->vcc_pin;
 100
 101                 *sp = SS_DETECT | SS_3VCARD;
 102                 if (!rdy || at91_get_gpio_value(rdy))
 103                         *sp |= SS_READY;
 104                 if (!vcc || at91_get_gpio_value(vcc))
 105                         *sp |= SS_POWERON;
 106         } else
 107                 *sp = 0;
 108
 109         return 0;
 110 }
 111
 112 static int at91_cf_set_socket(struct pcmcia_socket *sock, struct socket_state_t *s)
 113 {
 114         struct at91_cf_socket   *cf;
 115
 116         cf = container_of(sock, struct at91_cf_socket, socket);
 117
 118         /* switch Vcc if needed and possible */
 119         if (cf->board->vcc_pin) {
 120                 switch (s->Vcc) {
 121                         case 0:
 122                                 at91_set_gpio_value(cf->board->vcc_pin, 0);
 123                                 break;
 124                         case 33:
 125                                 at91_set_gpio_value(cf->board->vcc_pin, 1);
 126                                 break;
 127                         default:
 128                                 return -EINVAL;
 129                 }
 130         }
 131
 132         /* toggle reset if needed */
 133         at91_set_gpio_value(cf->board->rst_pin, s->flags & SS_RESET);
 134
 135         pr_debug("%s: Vcc %d, io_irq %d, flags %04x csc %04x\n",
 136                 driver_name, s->Vcc, s->io_irq, s->flags, s->csc_mask);
 137
 138         return 0;
 139 }
 140
 141 static int at91_cf_ss_suspend(struct pcmcia_socket *s)
 142 {
 143         return at91_cf_set_socket(s, &dead_socket);
 144 }
 145
 146 /* we already mapped the I/O region */
 147 static int at91_cf_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
 148 {
 149         struct at91_cf_socket   *cf;
 150         u32                     csr;
 151
 152         cf = container_of(s, struct at91_cf_socket, socket);
 153         io->flags &= (MAP_ACTIVE | MAP_16BIT | MAP_AUTOSZ);
 154
 155         /*
 156          * Use 16 bit accesses unless/until we need 8-bit i/o space.
 157          * Always set CSR4 ... PCMCIA won't always unmap things.
 158          */
 159         csr = at91_sys_read(AT91_SMC_CSR(4)) & ~AT91_SMC_DBW;
 160
 161         /*
 162          * NOTE: this CF controller ignores IOIS16, so we can't really do
 163          * MAP_AUTOSZ.  The 16bit mode allows single byte access on either
 164          * D0-D7 (even addr) or D8-D15 (odd), so it's close enough for many
 165          * purposes (and handles ide-cs).
 166          *
 167          * The 8bit mode is needed for odd byte access on D0-D7.  It seems
 168          * some cards only like that way to get at the odd byte, despite
 169          * CF 3.0 spec table 35 also giving the D8-D15 option.
 170          */
 171         if (!(io->flags & (MAP_16BIT|MAP_AUTOSZ))) {
 172                 csr |= AT91_SMC_DBW_8;
 173                 pr_debug("%s: 8bit i/o bus\n", driver_name);
 174         } else {
 175                 csr |= AT91_SMC_DBW_16;
 176                 pr_debug("%s: 16bit i/o bus\n", driver_name);
 177         }
 178         at91_sys_write(AT91_SMC_CSR(4), csr);
 179
 180         io->start = cf->socket.io_offset;
 181         io->stop = io->start + SZ_2K - 1;
 182
 183         return 0;
 184 }
 185
 186 /* pcmcia layer maps/unmaps mem regions */
 187 static int at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
 188 {
 189         struct at91_cf_socket   *cf;
 190
 191         if (map->card_start)
 192                 return -EINVAL;
 193
 194         cf = container_of(s, struct at91_cf_socket, socket);
 195
 196         map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
 197         if (map->flags & MAP_ATTRIB)
 198                 map->static_start = CF_ATTR_PHYS;
 199         else
 200                 map->static_start = CF_MEM_PHYS;
 201
 202         return 0;
 203 }
 204
 205 static struct pccard_operations at91_cf_ops = {
 206         .init                   = at91_cf_ss_init,
 207         .suspend                = at91_cf_ss_suspend,
 208         .get_status             = at91_cf_get_status,
 209         .set_socket             = at91_cf_set_socket,
 210         .set_io_map             = at91_cf_set_io_map,
 211         .set_mem_map            = at91_cf_set_mem_map,
 212 };
 213
 214 /*--------------------------------------------------------------------------*/
 215
 216 static int __init at91_cf_probe(struct device *dev)
 217 {
 218         struct at91_cf_socket   *cf;
 219         struct at91_cf_data     *board = dev->platform_data;
 220         struct platform_device  *pdev = to_platform_device(dev);
 221         unsigned int            csa;
 222         int                     status;
 223
 224         if (!board || !board->det_pin || !board->rst_pin)
 225                 return -ENODEV;
 226
 227         cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
 228         if (!cf)
 229                 return -ENOMEM;
 230
 231         cf->board = board;
 232         cf->pdev = pdev;
 233         dev_set_drvdata(dev, cf);
 234
 235         /* CF takes over CS4, CS5, CS6 */
 236         csa = at91_sys_read(AT91_EBI_CSA);
 237         at91_sys_write(AT91_EBI_CSA, csa | AT91_EBI_CS4A_SMC_COMPACTFLASH);
 238
 239         /* force poweron defaults for these pins ... */
 240         (void) at91_set_A_periph(AT91_PIN_PC9, 0);      /* A25/CFRNW */
 241         (void) at91_set_A_periph(AT91_PIN_PC10, 0);     /* NCS4/CFCS */
 242         (void) at91_set_A_periph(AT91_PIN_PC11, 0);     /* NCS5/CFCE1 */
 243         (void) at91_set_A_periph(AT91_PIN_PC12, 0);     /* NCS6/CFCE2 */
 244
 245         /* nWAIT is _not_ a default setting */
 246         (void) at91_set_A_periph(AT91_PIN_PC6, 1);      /*  nWAIT */
 247
 248         /*
 249          * Static memory controller timing adjustments.
 250          * REVISIT:  these timings are in terms of MCK cycles, so
 251          * when MCK changes (cpufreq etc) so must these values...
 252          */
 253         at91_sys_write(AT91_SMC_CSR(4), AT91_SMC_ACSS_STD | AT91_SMC_DBW_16 | AT91_SMC_BAT | AT91_SMC_WSEN
 254                                 | AT91_SMC_NWS_(32)             /* wait states */
 255                                 | AT91_SMC_RWSETUP_(6)          /* setup time */
 256                                 | AT91_SMC_RWHOLD_(4)           /* hold time */
 257         );
 258
 259         /* must be a GPIO; ergo must trigger on both edges */
 260         status = request_irq(board->det_pin, at91_cf_irq,
 261                         SA_SAMPLE_RANDOM, driver_name, cf);
 262         if (status < 0)
 263                 goto fail0;
 264
 265         /*
 266          * The card driver will request this irq later as needed.
 267          * but it causes lots of "irqNN: nobody cared" messages
 268          * unless we report that we handle everything (sigh).
 269          * (Note:  DK board doesn't wire the IRQ pin...)
 270          */
 271         if (board->irq_pin) {
 272                 status = request_irq(board->irq_pin, at91_cf_irq,
 273                                 SA_SHIRQ, driver_name, cf);
 274                 if (status < 0)
 275                         goto fail0a;
 276                 cf->socket.pci_irq = board->irq_pin;
 277         }
 278         else
 279                 cf->socket.pci_irq = NR_IRQS + 1;
 280
 281         /* pcmcia layer only remaps "real" memory not iospace */
 282         cf->socket.io_offset = (unsigned long) ioremap(CF_IO_PHYS, SZ_2K);
 283         if (!cf->socket.io_offset)
 284                 goto fail1;
 285
 286         /* reserve CS4, CS5, and CS6 regions; but use just CS4 */
 287         if (!request_mem_region(AT91_CF_BASE, CF_SIZE, driver_name))
 288                 goto fail1;
 289
 290         pr_info("%s: irqs det #%d, io #%d\n", driver_name,
 291                 board->det_pin, board->irq_pin);
 292
 293         cf->socket.owner = THIS_MODULE;
 294         cf->socket.dev.dev = dev;
 295         cf->socket.ops = &at91_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].NumPorts = SZ_2K;
 301
 302         status = pcmcia_register_socket(&cf->socket);
 303         if (status < 0)
 304                 goto fail2;
 305
 306         return 0;
 307
 308 fail2:
 309         iounmap((void __iomem *) cf->socket.io_offset);
 310         release_mem_region(AT91_CF_BASE, CF_SIZE);
 311 fail1:
 312         if (board->irq_pin)
 313                 free_irq(board->irq_pin, cf);
 314 fail0a:
 315         free_irq(board->det_pin, cf);
 316 fail0:
 317         at91_sys_write(AT91_EBI_CSA, csa);
 318         kfree(cf);
 319         return status;
 320 }
 321
 322 static int __exit at91_cf_remove(struct device *dev)
 323 {
 324         struct at91_cf_socket *cf = dev_get_drvdata(dev);
 325         unsigned int csa;
 326
 327         pcmcia_unregister_socket(&cf->socket);
 328         free_irq(cf->board->irq_pin, cf);
 329         free_irq(cf->board->det_pin, cf);
 330         iounmap((void __iomem *) cf->socket.io_offset);
 331         release_mem_region(AT91_CF_BASE, CF_SIZE);
 332
 333         csa = at91_sys_read(AT91_EBI_CSA);
 334         at91_sys_write(AT91_EBI_CSA, csa & ~AT91_EBI_CS4A);
 335
 336         kfree(cf);
 337         return 0;
 338 }
 339
 340 static struct device_driver at91_cf_driver = {
 341         .name           = (char *) driver_name,
 342         .bus            = &platform_bus_type,
 343         .probe          = at91_cf_probe,
 344         .remove         = __exit_p(at91_cf_remove),
 345         .suspend        = pcmcia_socket_dev_suspend,
 346         .resume         = pcmcia_socket_dev_resume,
 347 };
 348
 349 /*--------------------------------------------------------------------------*/
 350
 351 static int __init at91_cf_init(void)
 352 {
 353         return driver_register(&at91_cf_driver);
 354 }
 355 module_init(at91_cf_init);
 356
 357 static void __exit at91_cf_exit(void)
 358 {
 359         driver_unregister(&at91_cf_driver);
 360 }
 361 module_exit(at91_cf_exit);
 362
 363 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
 364 MODULE_AUTHOR("David Brownell");
 365 MODULE_LICENSE("GPL");