drivers/pcmcia/hd64465_ss.c

   1 /*
   2  * $Id: hd64465_ss.c,v 1.7 2003/07/06 14:42:50 lethal Exp $
   3  *
   4  * Device driver for the PCMCIA controller module of the
   5  * Hitachi HD64465 handheld companion chip.
   6  *
   7  * Note that the HD64465 provides a very thin PCMCIA host bridge
   8  * layer, requiring a lot of the work of supporting cards to be
   9  * performed by the processor.  For example: mapping of card
  10  * interrupts to processor IRQs is done by IRQ demuxing software;
  11  * IO and memory mappings are fixed; setting voltages according
  12  * to card Voltage Select pins etc is done in software.
  13  *
  14  * Note also that this driver uses only the simple, fixed,
  15  * 16MB, 16-bit wide mappings to PCMCIA spaces defined by the
  16  * HD64465.  Larger mappings, smaller mappings, or mappings of
  17  * different width to the same socket, are all possible only by
  18  * involving the SH7750's MMU, which is considered unnecessary here.
  19  * The downside is that it may be possible for some drivers to
  20  * break because they need or expect 8-bit mappings.
  21  *
  22  * This driver currently supports only the following configuration:
  23  * SH7750 CPU, HD64465, TPS2206 voltage control chip.
  24  *
  25  * by Greg Banks <gbanks@pocketpenguins.com>
  26  * (c) 2000 PocketPenguins Inc
  27  */
  28
  29 #include <linux/types.h>
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/string.h>
  33 #include <linux/kernel.h>
  34 #include <linux/ioport.h>
  35 #include <linux/mm.h>
  36 #include <linux/vmalloc.h>
  37 #include <asm/errno.h>
  38 #include <linux/irq.h>
  39 #include <linux/interrupt.h>
  40 #include <linux/platform_device.h>
  41
  42 #include <asm/io.h>
  43 #include <asm/hd64465/hd64465.h>
  44 #include <asm/hd64465/io.h>
  45
  46 #include <pcmcia/cs_types.h>
  47 #include <pcmcia/cs.h>
  48 #include <pcmcia/cistpl.h>
  49 #include <pcmcia/ds.h>
  50 #include <pcmcia/ss.h>
  51 #include <pcmcia/bulkmem.h>
  52 #include "cs_internal.h"
  53
  54 #define MODNAME "hd64465_ss"
  55
  56 /* #define HD64465_DEBUG 1 */
  57
  58 #if HD64465_DEBUG
  59 #define DPRINTK(args...)        printk(MODNAME ": " args)
  60 #else
  61 #define DPRINTK(args...)
  62 #endif
  63
  64 extern int hd64465_io_debug;
  65 extern void * p3_ioremap(unsigned long phys_addr, unsigned long size, unsigned long flags);
  66 extern void p3_iounmap(void *addr);
  67
  68 /*============================================================*/
  69
  70 #define HS_IO_MAP_SIZE  (64*1024)
  71
  72 typedef struct hs_socket_t
  73 {
  74     unsigned int        number;
  75     u_int               irq;
  76     u_long              mem_base;
  77     void                *io_base;
  78     u_long              mem_length;
  79     u_int               ctrl_base;
  80     socket_state_t      state;
  81     pccard_io_map       io_maps[MAX_IO_WIN];
  82     pccard_mem_map      mem_maps[MAX_WIN];
  83     struct pcmcia_socket        socket;
  84 } hs_socket_t;
  85
  86
  87
  88 #define HS_MAX_SOCKETS 2
  89 static hs_socket_t hs_sockets[HS_MAX_SOCKETS];
  90
  91 #define hs_in(sp, r)        inb((sp)->ctrl_base + (r))
  92 #define hs_out(sp, v, r)    outb(v, (sp)->ctrl_base + (r))
  93
  94
  95 /* translate a boolean value to a bit in a register */
  96 #define bool_to_regbit(sp, r, bi, bo)           \
  97     do {                                        \
  98         unsigned short v = hs_in(sp, r);        \
  99         if (bo)                                 \
 100             v |= (bi);                          \
 101         else                                    \
 102             v &= ~(bi);                         \
 103         hs_out(sp, v, r);                       \
 104     } while(0)
 105
 106 /* register offsets from HD64465_REG_PCC[01]ISR */
 107 #define ISR     0x0
 108 #define GCR     0x2
 109 #define CSCR    0x4
 110 #define CSCIER  0x6
 111 #define SCR     0x8
 112
 113
 114 /* Mask and values for CSCIER register */
 115 #define IER_MASK    0x80
 116 #define IER_ON      0x3f        /* interrupts on */
 117 #define IER_OFF     0x00        /* interrupts off */
 118
 119 /*============================================================*/
 120
 121 #if HD64465_DEBUG > 10
 122
 123 static void cis_hex_dump(const unsigned char *x, int len)
 124 {
 125         int i;
 126
 127         for (i=0 ; i<len ; i++)
 128         {
 129             if (!(i & 0xf))
 130                 printk("\n%08x", (unsigned)(x + i));
 131             printk(" %02x", *(volatile unsigned short*)x);
 132             x += 2;
 133         }
 134         printk("\n");
 135 }
 136
 137 #endif
 138 /*============================================================*/
 139
 140 /*
 141  * This code helps create the illusion that the IREQ line from
 142  * the PC card is mapped to one of the CPU's IRQ lines by the
 143  * host bridge hardware (which is how every host bridge *except*
 144  * the HD64465 works).  In particular, it supports enabling
 145  * and disabling the IREQ line by code which knows nothing
 146  * about the host bridge (e.g. device drivers, IDE code) using
 147  * the request_irq(), free_irq(), probe_irq_on() and probe_irq_off()
 148  * functions.  Also, it supports sharing the mapped IRQ with
 149  * real hardware IRQs from the -IRL0-3 lines.
 150  */
 151
 152 #define HS_NUM_MAPPED_IRQS  16  /* Limitation of the PCMCIA code */
 153 static struct
 154 {
 155     /* index is mapped irq number */
 156     hs_socket_t *sock;
 157     hw_irq_controller *old_handler;
 158 } hs_mapped_irq[HS_NUM_MAPPED_IRQS];
 159
 160 static void hs_socket_enable_ireq(hs_socket_t *sp)
 161 {
 162         unsigned short cscier;
 163
 164         DPRINTK("hs_socket_enable_ireq(sock=%d)\n", sp->number);
 165
 166         cscier = hs_in(sp, CSCIER);
 167         cscier &= ~HD64465_PCCCSCIER_PIREQE_MASK;
 168         cscier |= HD64465_PCCCSCIER_PIREQE_LEVEL;
 169         hs_out(sp, cscier, CSCIER);
 170 }
 171
 172 static void hs_socket_disable_ireq(hs_socket_t *sp)
 173 {
 174         unsigned short cscier;
 175
 176         DPRINTK("hs_socket_disable_ireq(sock=%d)\n", sp->number);
 177
 178         cscier = hs_in(sp, CSCIER);
 179         cscier &= ~HD64465_PCCCSCIER_PIREQE_MASK;
 180         hs_out(sp, cscier, CSCIER);
 181 }
 182
 183 static unsigned int hs_startup_irq(unsigned int irq)
 184 {
 185         hs_socket_enable_ireq(hs_mapped_irq[irq].sock);
 186         hs_mapped_irq[irq].old_handler->startup(irq);
 187         return 0;
 188 }
 189
 190 static void hs_shutdown_irq(unsigned int irq)
 191 {
 192         hs_socket_disable_ireq(hs_mapped_irq[irq].sock);
 193         hs_mapped_irq[irq].old_handler->shutdown(irq);
 194 }
 195
 196 static void hs_enable_irq(unsigned int irq)
 197 {
 198         hs_socket_enable_ireq(hs_mapped_irq[irq].sock);
 199         hs_mapped_irq[irq].old_handler->enable(irq);
 200 }
 201
 202 static void hs_disable_irq(unsigned int irq)
 203 {
 204         hs_socket_disable_ireq(hs_mapped_irq[irq].sock);
 205         hs_mapped_irq[irq].old_handler->disable(irq);
 206 }
 207
 208 extern struct hw_interrupt_type no_irq_type;
 209
 210 static void hs_mask_and_ack_irq(unsigned int irq)
 211 {
 212         hs_socket_disable_ireq(hs_mapped_irq[irq].sock);
 213         /* ack_none() spuriously complains about an unexpected IRQ */
 214         if (hs_mapped_irq[irq].old_handler != &no_irq_type)
 215             hs_mapped_irq[irq].old_handler->ack(irq);
 216 }
 217
 218 static void hs_end_irq(unsigned int irq)
 219 {
 220         hs_socket_enable_ireq(hs_mapped_irq[irq].sock);
 221         hs_mapped_irq[irq].old_handler->end(irq);
 222 }
 223
 224
 225 static struct hw_interrupt_type hd64465_ss_irq_type = {
 226         .typename       = "PCMCIA-IRQ",
 227         .startup        = hs_startup_irq,
 228         .shutdown       = hs_shutdown_irq,
 229         .enable         = hs_enable_irq,
 230         .disable        = hs_disable_irq,
 231         .ack            = hs_mask_and_ack_irq,
 232         .end            = hs_end_irq
 233 };
 234
 235 /*
 236  * This function should only ever be called with interrupts disabled.
 237  */
 238 static void hs_map_irq(hs_socket_t *sp, unsigned int irq)
 239 {
 240         DPRINTK("hs_map_irq(sock=%d irq=%d)\n", sp->number, irq);
 241
 242         if (irq >= HS_NUM_MAPPED_IRQS)
 243             return;
 244
 245         hs_mapped_irq[irq].sock = sp;
 246         /* insert ourselves as the irq controller */
 247         hs_mapped_irq[irq].old_handler = irq_desc[irq].chip;
 248         irq_desc[irq].chip = &hd64465_ss_irq_type;
 249 }
 250
 251
 252 /*
 253  * This function should only ever be called with interrupts disabled.
 254  */
 255 static void hs_unmap_irq(hs_socket_t *sp, unsigned int irq)
 256 {
 257         DPRINTK("hs_unmap_irq(sock=%d irq=%d)\n", sp->number, irq);
 258
 259         if (irq >= HS_NUM_MAPPED_IRQS)
 260             return;
 261
 262         /* restore the original irq controller */
 263         irq_desc[irq].chip = hs_mapped_irq[irq].old_handler;
 264 }
 265
 266 /*============================================================*/
 267
 268
 269 /*
 270  * Set Vpp and Vcc (in tenths of a Volt).  Does not
 271  * support the hi-Z state.
 272  *
 273  * Note, this assumes the board uses a TPS2206 chip to control
 274  * the Vcc and Vpp voltages to the hs_sockets.  If your board
 275  * uses the MIC2563 (also supported by the HD64465) then you
 276  * will have to modify this function.
 277  */
 278                                          /* 0V   3.3V  5.5V */
 279 static const u_char hs_tps2206_avcc[3] = { 0x00, 0x04, 0x08 };
 280 static const u_char hs_tps2206_bvcc[3] = { 0x00, 0x80, 0x40 };
 281
 282 static int hs_set_voltages(hs_socket_t *sp, int Vcc, int Vpp)
 283 {
 284         u_int psr;
 285         u_int vcci = 0;
 286         u_int sock = sp->number;
 287
 288         DPRINTK("hs_set_voltage(%d, %d, %d)\n", sock, Vcc, Vpp);
 289
 290         switch (Vcc)
 291         {
 292         case 0:  vcci = 0; break;
 293         case 33: vcci = 1; break;
 294         case 50: vcci = 2; break;
 295         default: return 0;
 296         }
 297
 298         /* Note: Vpp = 120 not supported -- Greg Banks */
 299         if (Vpp != 0 && Vpp != Vcc)
 300             return 0;
 301
 302         /* The PSR register holds 8 of the 9 bits which control
 303          * the TPS2206 via its serial interface.
 304          */
 305         psr = inw(HD64465_REG_PCCPSR);
 306         switch (sock)
 307         {
 308         case 0:
 309             psr &= 0x0f;
 310             psr |= hs_tps2206_avcc[vcci];
 311             psr |= (Vpp == 0 ? 0x00 : 0x02);
 312             break;
 313         case 1:
 314             psr &= 0xf0;
 315             psr |= hs_tps2206_bvcc[vcci];
 316             psr |= (Vpp == 0 ? 0x00 : 0x20);
 317             break;
 318         };
 319         outw(psr, HD64465_REG_PCCPSR);
 320
 321         return 1;
 322 }
 323
 324
 325 /*============================================================*/
 326
 327 /*
 328  * Drive the RESET line to the card.
 329  */
 330 static void hs_reset_socket(hs_socket_t *sp, int on)
 331 {
 332         unsigned short v;
 333
 334         v = hs_in(sp, GCR);
 335         if (on)
 336             v |= HD64465_PCCGCR_PCCR;
 337         else
 338             v &= ~HD64465_PCCGCR_PCCR;
 339         hs_out(sp, v, GCR);
 340 }
 341
 342 /*============================================================*/
 343
 344 static int hs_init(struct pcmcia_socket *s)
 345 {
 346         hs_socket_t *sp = container_of(s, struct hs_socket_t, socket);
 347
 348         DPRINTK("hs_init(%d)\n", sp->number);
 349
 350         return 0;
 351 }
 352
 353 /*============================================================*/
 354
 355
 356 static int hs_get_status(struct pcmcia_socket *s, u_int *value)
 357 {
 358         hs_socket_t *sp = container_of(s, struct hs_socket_t, socket);
 359         unsigned int isr;
 360         u_int status = 0;
 361
 362
 363         isr = hs_in(sp, ISR);
 364
 365         /* Card is seated and powered when *both* CD pins are low */
 366         if ((isr & HD64465_PCCISR_PCD_MASK) == 0)
 367         {
 368             status |= SS_DETECT;    /* card present */
 369
 370             switch (isr & HD64465_PCCISR_PBVD_MASK)
 371             {
 372             case HD64465_PCCISR_PBVD_BATGOOD:
 373                 break;
 374             case HD64465_PCCISR_PBVD_BATWARN:
 375                 status |= SS_BATWARN;
 376                 break;
 377             default:
 378                 status |= SS_BATDEAD;
 379                 break;
 380             }
 381
 382             if (isr & HD64465_PCCISR_PREADY)
 383                 status |= SS_READY;
 384
 385             if (isr & HD64465_PCCISR_PMWP)
 386                 status |= SS_WRPROT;
 387
 388             /* Voltage Select pins interpreted as per Table 4-5 of the std.
 389              * Assuming we have the TPS2206, the socket is a "Low Voltage
 390              * key, 3.3V and 5V available, no X.XV available".
 391              */
 392             switch (isr & (HD64465_PCCISR_PVS2|HD64465_PCCISR_PVS1))
 393             {
 394             case HD64465_PCCISR_PVS1:
 395                 printk(KERN_NOTICE MODNAME ": cannot handle X.XV card, ignored\n");
 396                 status = 0;
 397                 break;
 398             case 0:
 399             case HD64465_PCCISR_PVS2:
 400                 /* 3.3V */
 401                 status |= SS_3VCARD;
 402                 break;
 403             case HD64465_PCCISR_PVS2|HD64465_PCCISR_PVS1:
 404                 /* 5V */
 405                 break;
 406             }
 407
 408             /* TODO: SS_POWERON */
 409             /* TODO: SS_STSCHG */
 410         }
 411
 412         DPRINTK("hs_get_status(%d) = %x\n", sock, status);
 413
 414         *value = status;
 415         return 0;
 416 }
 417
 418 /*============================================================*/
 419
 420 static int hs_set_socket(struct pcmcia_socket *s, socket_state_t *state)
 421 {
 422         hs_socket_t *sp = container_of(s, struct hs_socket_t, socket);
 423         u_long flags;
 424         u_int changed;
 425         unsigned short cscier;
 426
 427         DPRINTK("hs_set_socket(sock=%d, flags=%x, csc_mask=%x, Vcc=%d, Vpp=%d, io_irq=%d)\n",
 428             sock, state->flags, state->csc_mask, state->Vcc, state->Vpp, state->io_irq);
 429
 430         local_irq_save(flags);  /* Don't want interrupts happening here */
 431
 432         if (state->Vpp != sp->state.Vpp ||
 433             state->Vcc != sp->state.Vcc) {
 434             if (!hs_set_voltages(sp, state->Vcc, state->Vpp)) {
 435                 local_irq_restore(flags);
 436                 return -EINVAL;
 437             }
 438         }
 439
 440 /*      hd64465_io_debug = 1; */
 441         /*
 442          * Handle changes in the Card Status Change mask,
 443          * by propagating to the CSCR register
 444          */
 445         changed = sp->state.csc_mask ^ state->csc_mask;
 446         cscier = hs_in(sp, CSCIER);
 447
 448         if (changed & SS_DETECT) {
 449             if (state->csc_mask & SS_DETECT)
 450                 cscier |= HD64465_PCCCSCIER_PCDE;
 451             else
 452                 cscier &= ~HD64465_PCCCSCIER_PCDE;
 453         }
 454
 455         if (changed & SS_READY) {
 456             if (state->csc_mask & SS_READY)
 457                 cscier |= HD64465_PCCCSCIER_PRE;
 458             else
 459                 cscier &= ~HD64465_PCCCSCIER_PRE;
 460         }
 461
 462         if (changed & SS_BATDEAD) {
 463             if (state->csc_mask & SS_BATDEAD)
 464                 cscier |= HD64465_PCCCSCIER_PBDE;
 465             else
 466                 cscier &= ~HD64465_PCCCSCIER_PBDE;
 467         }
 468
 469         if (changed & SS_BATWARN) {
 470             if (state->csc_mask & SS_BATWARN)
 471                 cscier |= HD64465_PCCCSCIER_PBWE;
 472             else
 473                 cscier &= ~HD64465_PCCCSCIER_PBWE;
 474         }
 475
 476         if (changed & SS_STSCHG) {
 477             if (state->csc_mask & SS_STSCHG)
 478                 cscier |= HD64465_PCCCSCIER_PSCE;
 479             else
 480                 cscier &= ~HD64465_PCCCSCIER_PSCE;
 481         }
 482
 483         hs_out(sp, cscier, CSCIER);
 484
 485         if (sp->state.io_irq && !state->io_irq)
 486             hs_unmap_irq(sp, sp->state.io_irq);
 487         else if (!sp->state.io_irq && state->io_irq)
 488             hs_map_irq(sp, state->io_irq);
 489
 490
 491         /*
 492          * Handle changes in the flags field,
 493          * by propagating to config registers.
 494          */
 495         changed = sp->state.flags ^ state->flags;
 496
 497         if (changed & SS_IOCARD) {
 498             DPRINTK("card type: %s\n",
 499                     (state->flags & SS_IOCARD ? "i/o" : "memory" ));
 500             bool_to_regbit(sp, GCR, HD64465_PCCGCR_PCCT,
 501                 state->flags & SS_IOCARD);
 502         }
 503
 504         if (changed & SS_RESET) {
 505             DPRINTK("%s reset card\n",
 506                 (state->flags & SS_RESET ? "start" : "stop"));
 507             bool_to_regbit(sp, GCR, HD64465_PCCGCR_PCCR,
 508                 state->flags & SS_RESET);
 509         }
 510
 511         if (changed & SS_OUTPUT_ENA) {
 512             DPRINTK("%sabling card output\n",
 513                 (state->flags & SS_OUTPUT_ENA ? "en" : "dis"));
 514             bool_to_regbit(sp, GCR, HD64465_PCCGCR_PDRV,
 515                 state->flags & SS_OUTPUT_ENA);
 516         }
 517
 518         /* TODO: SS_SPKR_ENA */
 519
 520 /*      hd64465_io_debug = 0; */
 521         sp->state = *state;
 522
 523         local_irq_restore(flags);
 524
 525 #if HD64465_DEBUG > 10
 526         if (state->flags & SS_OUTPUT_ENA)
 527             cis_hex_dump((const unsigned char*)sp->mem_base, 0x100);
 528 #endif
 529         return 0;
 530 }
 531
 532 /*============================================================*/
 533
 534 static int hs_set_io_map(struct pcmcia_socket *s, struct pccard_io_map *io)
 535 {
 536         hs_socket_t *sp = container_of(s, struct hs_socket_t, socket);
 537         int map = io->map;
 538         int sock = sp->number;
 539         struct pccard_io_map *sio;
 540         pgprot_t prot;
 541
 542         DPRINTK("hs_set_io_map(sock=%d, map=%d, flags=0x%x, speed=%dns, start=%#lx, stop=%#lx)\n",
 543             sock, map, io->flags, io->speed, io->start, io->stop);
 544         if (map >= MAX_IO_WIN)
 545             return -EINVAL;
 546         sio = &sp->io_maps[map];
 547
 548         /* check for null changes */
 549         if (io->flags == sio->flags &&
 550             io->start == sio->start &&
 551             io->stop == sio->stop)
 552             return 0;
 553
 554         if (io->flags & MAP_AUTOSZ)
 555             prot = PAGE_KERNEL_PCC(sock, _PAGE_PCC_IODYN);
 556         else if (io->flags & MAP_16BIT)
 557             prot = PAGE_KERNEL_PCC(sock, _PAGE_PCC_IO16);
 558         else
 559             prot = PAGE_KERNEL_PCC(sock, _PAGE_PCC_IO8);
 560
 561         /* TODO: handle MAP_USE_WAIT */
 562         if (io->flags & MAP_USE_WAIT)
 563             printk(KERN_INFO MODNAME ": MAP_USE_WAIT unimplemented\n");
 564         /* TODO: handle MAP_PREFETCH */
 565         if (io->flags & MAP_PREFETCH)
 566             printk(KERN_INFO MODNAME ": MAP_PREFETCH unimplemented\n");
 567         /* TODO: handle MAP_WRPROT */
 568         if (io->flags & MAP_WRPROT)
 569             printk(KERN_INFO MODNAME ": MAP_WRPROT unimplemented\n");
 570         /* TODO: handle MAP_0WS */
 571         if (io->flags & MAP_0WS)
 572             printk(KERN_INFO MODNAME ": MAP_0WS unimplemented\n");
 573
 574         if (io->flags & MAP_ACTIVE) {
 575             unsigned long pstart, psize, paddrbase;
 576
 577             paddrbase = virt_to_phys((void*)(sp->mem_base + 2 * HD64465_PCC_WINDOW));
 578             pstart = io->start & PAGE_MASK;
 579             psize = ((io->stop + PAGE_SIZE) & PAGE_MASK) - pstart;
 580
 581             /*
 582              * Change PTEs in only that portion of the mapping requested
 583              * by the caller.  This means that most of the time, most of
 584              * the PTEs in the io_vma will be unmapped and only the bottom
 585              * page will be mapped.  But the code allows for weird cards
 586              * that might want IO ports > 4K.
 587              */
 588             sp->io_base = p3_ioremap(paddrbase + pstart, psize, pgprot_val(prot));
 589
 590             /*
 591              * Change the mapping used by inb() outb() etc
 592              */
 593             hd64465_port_map(io->start,
 594                 io->stop - io->start + 1,
 595                 (unsigned long)sp->io_base + io->start, 0);
 596         } else {
 597             hd64465_port_unmap(sio->start, sio->stop - sio->start + 1);
 598             p3_iounmap(sp->io_base);
 599         }
 600
 601         *sio = *io;
 602         return 0;
 603 }
 604
 605 /*============================================================*/
 606
 607 static int hs_set_mem_map(struct pcmcia_socket *s, struct pccard_mem_map *mem)
 608 {
 609         hs_socket_t *sp = container_of(s, struct hs_socket_t, socket);
 610         struct pccard_mem_map *smem;
 611         int map = mem->map;
 612         unsigned long paddr;
 613
 614 #if 0
 615         DPRINTK("hs_set_mem_map(sock=%d, map=%d, flags=0x%x, card_start=0x%08x)\n",
 616             sock, map, mem->flags, mem->card_start);
 617 #endif
 618
 619         if (map >= MAX_WIN)
 620             return -EINVAL;
 621         smem = &sp->mem_maps[map];
 622
 623         paddr = sp->mem_base;               /* base of Attribute mapping */
 624         if (!(mem->flags & MAP_ATTRIB))
 625             paddr += HD64465_PCC_WINDOW;    /* base of Common mapping */
 626         paddr += mem->card_start;
 627
 628         /* Because we specified SS_CAP_STATIC_MAP, we are obliged
 629          * at this time to report the system address corresponding
 630          * to the card address requested.  This is how Socket Services
 631          * queries our fixed mapping.  I wish this fact had been
 632          * documented - Greg Banks.
 633          */
 634         mem->static_start = paddr;
 635
 636         *smem = *mem;
 637
 638         return 0;
 639 }
 640
 641 /* TODO: do we need to use the MMU to access Common memory ??? */
 642
 643 /*============================================================*/
 644
 645 /*
 646  * This function is registered with the HD64465 glue code to do a
 647  * secondary demux step on the PCMCIA interrupts.  It handles
 648  * mapping the IREQ request from the card to a standard Linux
 649  * IRQ, as requested by SocketServices.
 650  */
 651 static int hs_irq_demux(int irq, void *dev)
 652 {
 653         hs_socket_t *sp = dev;
 654         u_int cscr;
 655
 656         DPRINTK("hs_irq_demux(irq=%d)\n", irq);
 657
 658         if (sp->state.io_irq &&
 659             (cscr = hs_in(sp, CSCR)) & HD64465_PCCCSCR_PIREQ) {
 660             cscr &= ~HD64465_PCCCSCR_PIREQ;
 661             hs_out(sp, cscr, CSCR);
 662             return sp->state.io_irq;
 663         }
 664
 665         return irq;
 666 }
 667
 668 /*============================================================*/
 669
 670 /*
 671  * Interrupt handling routine.
 672  */
 673
 674 static irqreturn_t hs_interrupt(int irq, void *dev)
 675 {
 676         hs_socket_t *sp = dev;
 677         u_int events = 0;
 678         u_int cscr;
 679
 680         cscr = hs_in(sp, CSCR);
 681
 682         DPRINTK("hs_interrupt, cscr=%04x\n", cscr);
 683
 684         /* check for bus-related changes to be reported to Socket Services */
 685         if (cscr & HD64465_PCCCSCR_PCDC) {
 686             /* double-check for a 16-bit card, as we don't support CardBus */
 687             if ((hs_in(sp, ISR) & HD64465_PCCISR_PCD_MASK) != 0) {
 688                 printk(KERN_NOTICE MODNAME
 689                     ": socket %d, card not a supported card type or not inserted correctly\n",
 690                     sp->number);
 691                 /* Don't do the rest unless a card is present */
 692                 cscr &= ~(HD64465_PCCCSCR_PCDC|
 693                           HD64465_PCCCSCR_PRC|
 694                           HD64465_PCCCSCR_PBW|
 695                           HD64465_PCCCSCR_PBD|
 696                           HD64465_PCCCSCR_PSC);
 697             } else {
 698                 cscr &= ~HD64465_PCCCSCR_PCDC;
 699                 events |= SS_DETECT;            /* card insertion or removal */
 700             }
 701         }
 702         if (cscr & HD64465_PCCCSCR_PRC) {
 703             cscr &= ~HD64465_PCCCSCR_PRC;
 704             events |= SS_READY;         /* ready signal changed */
 705         }
 706         if (cscr & HD64465_PCCCSCR_PBW) {
 707             cscr &= ~HD64465_PCCCSCR_PSC;
 708             events |= SS_BATWARN;       /* battery warning */
 709         }
 710         if (cscr & HD64465_PCCCSCR_PBD) {
 711             cscr &= ~HD64465_PCCCSCR_PSC;
 712             events |= SS_BATDEAD;       /* battery dead */
 713         }
 714         if (cscr & HD64465_PCCCSCR_PSC) {
 715             cscr &= ~HD64465_PCCCSCR_PSC;
 716             events |= SS_STSCHG;        /* STSCHG (status changed) signal */
 717         }
 718
 719         if (cscr & HD64465_PCCCSCR_PIREQ) {
 720             cscr &= ~HD64465_PCCCSCR_PIREQ;
 721
 722             /* This should have been dealt with during irq demux */
 723             printk(KERN_NOTICE MODNAME ": unexpected IREQ from card\n");
 724         }
 725
 726         hs_out(sp, cscr, CSCR);
 727
 728         if (events)
 729                 pcmcia_parse_events(&sp->socket, events);
 730
 731         return IRQ_HANDLED;
 732 }
 733
 734 /*============================================================*/
 735
 736 static struct pccard_operations hs_operations = {
 737         .init                   = hs_init,
 738         .get_status             = hs_get_status,
 739         .set_socket             = hs_set_socket,
 740         .set_io_map             = hs_set_io_map,
 741         .set_mem_map            = hs_set_mem_map,
 742 };
 743
 744 static int hs_init_socket(hs_socket_t *sp, int irq, unsigned long mem_base,
 745             unsigned int ctrl_base)
 746 {
 747         unsigned short v;
 748         int i, err;
 749
 750         memset(sp, 0, sizeof(*sp));
 751         sp->irq = irq;
 752         sp->mem_base = mem_base;
 753         sp->mem_length = 4*HD64465_PCC_WINDOW;  /* 16MB */
 754         sp->ctrl_base = ctrl_base;
 755
 756         for (i=0 ; i<MAX_IO_WIN ; i++)
 757             sp->io_maps[i].map = i;
 758         for (i=0 ; i<MAX_WIN ; i++)
 759             sp->mem_maps[i].map = i;
 760
 761         hd64465_register_irq_demux(sp->irq, hs_irq_demux, sp);
 762
 763         if ((err = request_irq(sp->irq, hs_interrupt, IRQF_DISABLED, MODNAME, sp)) < 0)
 764             return err;
 765         if (request_mem_region(sp->mem_base, sp->mem_length, MODNAME) == 0) {
 766             sp->mem_base = 0;
 767             return -ENOMEM;
 768         }
 769
 770
 771         /* According to section 3.2 of the PCMCIA standard, low-voltage
 772          * capable cards must implement cold insertion, i.e. Vpp and
 773          * Vcc set to 0 before card is inserted.
 774          */
 775         /*hs_set_voltages(sp, 0, 0);*/
 776
 777         /* hi-Z the outputs to the card and set 16MB map mode */
 778         v = hs_in(sp, GCR);
 779         v &= ~HD64465_PCCGCR_PCCT;      /* memory-only card */
 780         hs_out(sp, v, GCR);
 781
 782         v = hs_in(sp, GCR);
 783         v |= HD64465_PCCGCR_PDRV;       /* enable outputs to card */
 784         hs_out(sp, v, GCR);
 785
 786         v = hs_in(sp, GCR);
 787         v |= HD64465_PCCGCR_PMMOD;      /* 16MB mapping mode */
 788         hs_out(sp, v, GCR);
 789
 790         v = hs_in(sp, GCR);
 791         /* lowest 16MB of Common */
 792         v &= ~(HD64465_PCCGCR_PPA25|HD64465_PCCGCR_PPA24);
 793         hs_out(sp, v, GCR);
 794
 795         hs_reset_socket(sp, 1);
 796
 797         printk(KERN_INFO "HD64465 PCMCIA bridge socket %d at 0x%08lx irq %d\n",
 798                 i, sp->mem_base, sp->irq);
 799
 800         return 0;
 801 }
 802
 803 static void hs_exit_socket(hs_socket_t *sp)
 804 {
 805         unsigned short cscier, gcr;
 806         unsigned long flags;
 807
 808         local_irq_save(flags);
 809
 810         /* turn off interrupts in hardware */
 811         cscier = hs_in(sp, CSCIER);
 812         cscier = (cscier & IER_MASK) | IER_OFF;
 813         hs_out(sp, cscier, CSCIER);
 814
 815         /* hi-Z the outputs to the card */
 816         gcr = hs_in(sp, GCR);
 817         gcr &= HD64465_PCCGCR_PDRV;
 818         hs_out(sp, gcr, GCR);
 819
 820         /* power the card down */
 821         hs_set_voltages(sp, 0, 0);
 822
 823         if (sp->mem_base != 0)
 824             release_mem_region(sp->mem_base, sp->mem_length);
 825         if (sp->irq != 0) {
 826             free_irq(sp->irq, hs_interrupt);
 827             hd64465_unregister_irq_demux(sp->irq);
 828         }
 829
 830         local_irq_restore(flags);
 831 }
 832
 833 static struct device_driver hd64465_driver = {
 834         .name = "hd64465-pcmcia",
 835         .bus = &platform_bus_type,
 836         .suspend = pcmcia_socket_dev_suspend,
 837         .resume = pcmcia_socket_dev_resume,
 838 };
 839
 840 static struct platform_device hd64465_device = {
 841         .name = "hd64465-pcmcia",
 842         .id = 0,
 843 };
 844
 845 static int __init init_hs(void)
 846 {
 847         int i;
 848         unsigned short v;
 849
 850 /*      hd64465_io_debug = 1; */
 851         if (driver_register(&hd64465_driver))
 852                 return -EINVAL;
 853
 854         /* Wake both sockets out of STANDBY mode */
 855         /* TODO: wait 15ms */
 856         v = inw(HD64465_REG_SMSCR);
 857         v &= ~(HD64465_SMSCR_PC0ST|HD64465_SMSCR_PC1ST);
 858         outw(v, HD64465_REG_SMSCR);
 859
 860         /* keep power controller out of shutdown mode */
 861         v = inb(HD64465_REG_PCC0SCR);
 862         v |= HD64465_PCCSCR_SHDN;
 863         outb(v, HD64465_REG_PCC0SCR);
 864
 865         /* use serial (TPS2206) power controller */
 866         v = inb(HD64465_REG_PCC0CSCR);
 867         v |= HD64465_PCCCSCR_PSWSEL;
 868         outb(v, HD64465_REG_PCC0CSCR);
 869
 870         /*
 871          * Setup hs_sockets[] structures and request system resources.
 872          * TODO: on memory allocation failure, power down the socket
 873          *       before quitting.
 874          */
 875         for (i=0; i<HS_MAX_SOCKETS; i++) {
 876                 hs_set_voltages(&hs_sockets[i], 0, 0);
 877
 878                 hs_sockets[i].socket.features |=  SS_CAP_PCCARD | SS_CAP_STATIC_MAP;      /* mappings are fixed in host memory */
 879                 hs_sockets[i].socket.resource_ops = &pccard_static_ops;
 880                 hs_sockets[i].socket.irq_mask =  0xffde;/*0xffff*/          /* IRQs mapped in s/w so can do any, really */
 881                 hs_sockets[i].socket.map_size = HD64465_PCC_WINDOW;     /* 16MB fixed window size */
 882
 883                 hs_sockets[i].socket.owner = THIS_MODULE;
 884                 hs_sockets[i].socket.ss_entry = &hs_operations;
 885         }
 886
 887         i = hs_init_socket(&hs_sockets[0],
 888             HD64465_IRQ_PCMCIA0,
 889             HD64465_PCC0_BASE,
 890             HD64465_REG_PCC0ISR);
 891         if (i < 0) {
 892                 unregister_driver(&hd64465_driver);
 893                 return i;
 894         }
 895         i = hs_init_socket(&hs_sockets[1],
 896             HD64465_IRQ_PCMCIA1,
 897             HD64465_PCC1_BASE,
 898             HD64465_REG_PCC1ISR);
 899         if (i < 0) {
 900                 unregister_driver(&hd64465_driver);
 901                 return i;
 902         }
 903
 904 /*      hd64465_io_debug = 0; */
 905
 906         platform_device_register(&hd64465_device);
 907
 908         for (i=0; i<HS_MAX_SOCKETS; i++) {
 909                 unsigned int ret;
 910                 hs_sockets[i].socket.dev.dev = &hd64465_device.dev;
 911                 hs_sockets[i].number = i;
 912                 ret = pcmcia_register_socket(&hs_sockets[i].socket);
 913                 if (ret && i)
 914                         pcmcia_unregister_socket(&hs_sockets[0].socket);
 915         }
 916
 917         return 0;
 918 }
 919
 920 static void __exit exit_hs(void)
 921 {
 922         int i;
 923
 924         for (i=0 ; i<HS_MAX_SOCKETS ; i++) {
 925                 pcmcia_unregister_socket(&hs_sockets[i].socket);
 926                 hs_exit_socket(&hs_sockets[i]);
 927         }
 928
 929         platform_device_unregister(&hd64465_device);
 930         unregister_driver(&hd64465_driver);
 931 }
 932
 933 module_init(init_hs);
 934 module_exit(exit_hs);
 935
 936 /*============================================================*/
 937 /*END*/