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 /*
  32  * A0..A10 work in each range; A23 indicates I/O space;  A25 is CFRNW;
  33  * some other bit in {A24,A22..A11} is nREG to flag memory access
  34  * (vs attributes).  So more than 2KB/region would just be waste.
  35  */
  36 #define CF_ATTR_PHYS    (AT91_CF_BASE)
  37 #define CF_IO_PHYS      (AT91_CF_BASE  + (1 << 23))
  38 #define CF_MEM_PHYS     (AT91_CF_BASE  + 0x017ff800)
  39
  40 /*--------------------------------------------------------------------------*/
  41
  42 static const char driver_name[] = "at91_cf";
  43
  44 struct at91_cf_socket {
  45         struct pcmcia_socket    socket;
  46
  47         unsigned                present:1;
  48
  49         struct platform_device  *pdev;
  50         struct at91_cf_data     *board;
  51 };
  52
  53 #define SZ_2K                   (2 * SZ_1K)
  54
  55 static inline int at91_cf_present(struct at91_cf_socket *cf)
  56 {
  57         return !at91_get_gpio_value(cf->board->det_pin);
  58 }
  59
  60 /*--------------------------------------------------------------------------*/
  61
  62 static int at91_cf_ss_init(struct pcmcia_socket *s)
  63 {
  64         return 0;
  65 }
  66
  67 static irqreturn_t at91_cf_irq(int irq, void *_cf, struct pt_regs *r)
  68 {
  69         struct at91_cf_socket   *cf = (struct at91_cf_socket *) _cf;
  70
  71         if (irq == cf->board->det_pin) {
  72                 unsigned present = at91_cf_present(cf);
  73
  74                 /* kick pccard as needed */
  75                 if (present != cf->present) {
  76                         cf->present = present;
  77                         pr_debug("%s: card %s\n", driver_name,
  78                                         present ? "present" : "gone");
  79                         pcmcia_parse_events(&cf->socket, SS_DETECT);
  80                 }
  81         }
  82
  83         return IRQ_HANDLED;
  84 }
  85
  86 static int at91_cf_get_status(struct pcmcia_socket *s, u_int *sp)
  87 {
  88         struct at91_cf_socket   *cf;
  89
  90         if (!sp)
  91                 return -EINVAL;
  92
  93         cf = container_of(s, struct at91_cf_socket, socket);
  94
  95         /* NOTE: CF is always 3VCARD */
  96         if (at91_cf_present(cf)) {
  97                 int rdy = cf->board->irq_pin;   /* RDY/nIRQ */
  98                 int vcc = cf->board->vcc_pin;
  99
 100                 *sp = SS_DETECT | SS_3VCARD;
 101                 if (!rdy || at91_get_gpio_value(rdy))
 102                         *sp |= SS_READY;
 103                 if (!vcc || at91_get_gpio_value(vcc))
 104                         *sp |= SS_POWERON;
 105         } else
 106                 *sp = 0;
 107
 108         return 0;
 109 }
 110
 111 static int
 112 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
 188 at91_cf_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *map)
 189 {
 190         struct at91_cf_socket   *cf;
 191
 192         if (map->card_start)
 193                 return -EINVAL;
 194
 195         cf = container_of(s, struct at91_cf_socket, socket);
 196
 197         map->flags &= MAP_ACTIVE|MAP_ATTRIB|MAP_16BIT;
 198         if (map->flags & MAP_ATTRIB)
 199                 map->static_start = CF_ATTR_PHYS;
 200         else
 201                 map->static_start = CF_MEM_PHYS;
 202
 203         return 0;
 204 }
 205
 206 static struct pccard_operations at91_cf_ops = {
 207         .init                   = at91_cf_ss_init,
 208         .suspend                = at91_cf_ss_suspend,
 209         .get_status             = at91_cf_get_status,
 210         .set_socket             = at91_cf_set_socket,
 211         .set_io_map             = at91_cf_set_io_map,
 212         .set_mem_map            = at91_cf_set_mem_map,
 213 };
 214
 215 /*--------------------------------------------------------------------------*/
 216
 217 static int __init at91_cf_probe(struct device *dev)
 218 {
 219         struct at91_cf_socket   *cf;
 220         struct at91_cf_data     *board = dev->platform_data;
 221         struct platform_device  *pdev = to_platform_device(dev);
 222         struct resource         *io;
 223         unsigned int            csa;
 224         int                     status;
 225
 226         if (!board || !board->det_pin || !board->rst_pin)
 227                 return -ENODEV;
 228
 229         io = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 230         if (!io)
 231                 return -ENODEV;
 232
 233         cf = kcalloc(1, sizeof *cf, GFP_KERNEL);
 234         if (!cf)
 235                 return -ENOMEM;
 236
 237         cf->board = board;
 238         cf->pdev = pdev;
 239         dev_set_drvdata(dev, cf);
 240
 241         /* CF takes over CS4, CS5, CS6 */
 242         csa = at91_sys_read(AT91_EBI_CSA);
 243         at91_sys_write(AT91_EBI_CSA, csa | AT91_EBI_CS4A_SMC_COMPACTFLASH);
 244
 245         /* force poweron defaults for these pins ... */
 246         (void) at91_set_A_periph(AT91_PIN_PC9, 0);      /* A25/CFRNW */
 247         (void) at91_set_A_periph(AT91_PIN_PC10, 0);     /* NCS4/CFCS */
 248         (void) at91_set_A_periph(AT91_PIN_PC11, 0);     /* NCS5/CFCE1 */
 249         (void) at91_set_A_periph(AT91_PIN_PC12, 0);     /* NCS6/CFCE2 */
 250
 251         /* nWAIT is _not_ a default setting */
 252         (void) at91_set_A_periph(AT91_PIN_PC6, 1);      /*  nWAIT */
 253
 254         /*
 255          * Static memory controller timing adjustments.
 256          * REVISIT:  these timings are in terms of MCK cycles, so
 257          * when MCK changes (cpufreq etc) so must these values...
 258          */
 259         at91_sys_write(AT91_SMC_CSR(4),
 260                                   AT91_SMC_ACSS_STD
 261                                 | AT91_SMC_DBW_16
 262                                 | AT91_SMC_BAT
 263                                 | AT91_SMC_WSEN
 264                                 | AT91_SMC_NWS_(32)     /* wait states */
 265                                 | AT91_SMC_RWSETUP_(6)  /* setup time */
 266                                 | AT91_SMC_RWHOLD_(4)   /* hold time */
 267         );
 268
 269         /* must be a GPIO; ergo must trigger on both edges */
 270         status = request_irq(board->det_pin, at91_cf_irq,
 271                         SA_SAMPLE_RANDOM, driver_name, cf);
 272         if (status < 0)
 273                 goto fail0;
 274
 275         /*
 276          * The card driver will request this irq later as needed.
 277          * but it causes lots of "irqNN: nobody cared" messages
 278          * unless we report that we handle everything (sigh).
 279          * (Note:  DK board doesn't wire the IRQ pin...)
 280          */
 281         if (board->irq_pin) {
 282                 status = request_irq(board->irq_pin, at91_cf_irq,
 283                                 SA_SHIRQ, driver_name, cf);
 284                 if (status < 0)
 285                         goto fail0a;
 286                 cf->socket.pci_irq = board->irq_pin;
 287         } else
 288                 cf->socket.pci_irq = NR_IRQS + 1;
 289
 290         /* pcmcia layer only remaps "real" memory not iospace */
 291         cf->socket.io_offset = (unsigned long) ioremap(CF_IO_PHYS, SZ_2K);
 292         if (!cf->socket.io_offset)
 293                 goto fail1;
 294
 295         /* reserve CS4, CS5, and CS6 regions; but use just CS4 */
 296         if (!request_mem_region(io->start, io->end + 1 - io->start,
 297                                 driver_name))
 298                 goto fail1;
 299
 300         pr_info("%s: irqs det #%d, io #%d\n", driver_name,
 301                 board->det_pin, board->irq_pin);
 302
 303         cf->socket.owner = THIS_MODULE;
 304         cf->socket.dev.dev = dev;
 305         cf->socket.ops = &at91_cf_ops;
 306         cf->socket.resource_ops = &pccard_static_ops;
 307         cf->socket.features = SS_CAP_PCCARD | SS_CAP_STATIC_MAP
 308                                 | SS_CAP_MEM_ALIGN;
 309         cf->socket.map_size = SZ_2K;
 310         cf->socket.io[0].res = io;
 311
 312         status = pcmcia_register_socket(&cf->socket);
 313         if (status < 0)
 314                 goto fail2;
 315
 316         return 0;
 317
 318 fail2:
 319         iounmap((void __iomem *) cf->socket.io_offset);
 320         release_mem_region(io->start, io->end + 1 - io->start);
 321 fail1:
 322         if (board->irq_pin)
 323                 free_irq(board->irq_pin, cf);
 324 fail0a:
 325         free_irq(board->det_pin, cf);
 326 fail0:
 327         at91_sys_write(AT91_EBI_CSA, csa);
 328         kfree(cf);
 329         return status;
 330 }
 331
 332 static int __exit at91_cf_remove(struct device *dev)
 333 {
 334         struct at91_cf_socket   *cf = dev_get_drvdata(dev);
 335         struct resource         *io = cf->socket.io[0].res;
 336         unsigned int            csa;
 337
 338         pcmcia_unregister_socket(&cf->socket);
 339         free_irq(cf->board->irq_pin, cf);
 340         free_irq(cf->board->det_pin, cf);
 341         iounmap((void __iomem *) cf->socket.io_offset);
 342         release_mem_region(io->start, io->end + 1 - io->start);
 343
 344         csa = at91_sys_read(AT91_EBI_CSA);
 345         at91_sys_write(AT91_EBI_CSA, csa & ~AT91_EBI_CS4A);
 346
 347         kfree(cf);
 348         return 0;
 349 }
 350
 351 static struct device_driver at91_cf_driver = {
 352         .name           = (char *) driver_name,
 353         .bus            = &platform_bus_type,
 354         .probe          = at91_cf_probe,
 355         .remove         = __exit_p(at91_cf_remove),
 356         .suspend        = pcmcia_socket_dev_suspend,
 357         .resume         = pcmcia_socket_dev_resume,
 358 };
 359
 360 /*--------------------------------------------------------------------------*/
 361
 362 static int __init at91_cf_init(void)
 363 {
 364         return driver_register(&at91_cf_driver);
 365 }
 366 module_init(at91_cf_init);
 367
 368 static void __exit at91_cf_exit(void)
 369 {
 370         driver_unregister(&at91_cf_driver);
 371 }
 372 module_exit(at91_cf_exit);
 373
 374 MODULE_DESCRIPTION("AT91 Compact Flash Driver");
 375 MODULE_AUTHOR("David Brownell");
 376 MODULE_LICENSE("GPL");