drivers/parisc/eisa.c

   1 /*
   2  * eisa.c - provide support for EISA adapters in PA-RISC machines
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  *
   9  * Copyright (c) 2001 Matthew Wilcox for Hewlett Packard
  10  * Copyright (c) 2001 Daniel Engstrom <5116@telia.com>
  11  *
  12  * There are two distinct EISA adapters.  Mongoose is found in machines
  13  * before the 712; then the Wax ASIC is used.  To complicate matters, the
  14  * Wax ASIC also includes a PS/2 and RS-232 controller, but those are
  15  * dealt with elsewhere; this file is concerned only with the EISA portions
  16  * of Wax.
  17  *
  18  *
  19  * HINT:
  20  * -----
  21  * To allow an ISA card to work properly in the EISA slot you need to
  22  * set an edge trigger level. This may be done on the palo command line
  23  * by adding the kernel parameter "eisa_irq_edge=n,n2,[...]]", with
  24  * n and n2 as the irq levels you want to use.
  25  *
  26  * Example: "eisa_irq_edge=10,11" allows ISA cards to operate at
  27  * irq levels 10 and 11.
  28  */
  29
  30 #include <linux/init.h>
  31 #include <linux/ioport.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/kernel.h>
  34 #include <linux/module.h>
  35 #include <linux/pci.h>
  36 #include <linux/spinlock.h>
  37 #include <linux/eisa.h>
  38
  39 #include <asm/byteorder.h>
  40 #include <asm/io.h>
  41 #include <asm/hardware.h>
  42 #include <asm/processor.h>
  43 #include <asm/parisc-device.h>
  44 #include <asm/delay.h>
  45 #include <asm/eisa_bus.h>
  46 #include <asm/eisa_eeprom.h>
  47
  48 #if 0
  49 #define EISA_DBG(msg, arg... ) printk(KERN_DEBUG "eisa: " msg , ## arg )
  50 #else
  51 #define EISA_DBG(msg, arg... )
  52 #endif
  53
  54 #define SNAKES_EEPROM_BASE_ADDR 0xF0810400
  55 #define MIRAGE_EEPROM_BASE_ADDR 0xF00C0400
  56
  57 static DEFINE_SPINLOCK(eisa_irq_lock);
  58
  59 void __iomem *eisa_eeprom_addr __read_mostly;
  60
  61 /* We can only have one EISA adapter in the system because neither
  62  * implementation can be flexed.
  63  */
  64 static struct eisa_ba {
  65         struct pci_hba_data     hba;
  66         unsigned long eeprom_addr;
  67         struct eisa_root_device root;
  68 } eisa_dev;
  69
  70 /* Port ops */
  71
  72 static inline unsigned long eisa_permute(unsigned short port)
  73 {
  74         if (port & 0x300) {
  75                 return 0xfc000000 | ((port & 0xfc00) >> 6)
  76                         | ((port & 0x3f8) << 9) | (port & 7);
  77         } else {
  78                 return 0xfc000000 | port;
  79         }
  80 }
  81
  82 unsigned char eisa_in8(unsigned short port)
  83 {
  84         if (EISA_bus)
  85                 return gsc_readb(eisa_permute(port));
  86         return 0xff;
  87 }
  88
  89 unsigned short eisa_in16(unsigned short port)
  90 {
  91         if (EISA_bus)
  92                 return le16_to_cpu(gsc_readw(eisa_permute(port)));
  93         return 0xffff;
  94 }
  95
  96 unsigned int eisa_in32(unsigned short port)
  97 {
  98         if (EISA_bus)
  99                 return le32_to_cpu(gsc_readl(eisa_permute(port)));
 100         return 0xffffffff;
 101 }
 102
 103 void eisa_out8(unsigned char data, unsigned short port)
 104 {
 105         if (EISA_bus)
 106                 gsc_writeb(data, eisa_permute(port));
 107 }
 108
 109 void eisa_out16(unsigned short data, unsigned short port)
 110 {
 111         if (EISA_bus)
 112                 gsc_writew(cpu_to_le16(data), eisa_permute(port));
 113 }
 114
 115 void eisa_out32(unsigned int data, unsigned short port)
 116 {
 117         if (EISA_bus)
 118                 gsc_writel(cpu_to_le32(data), eisa_permute(port));
 119 }
 120
 121 #ifndef CONFIG_PCI
 122 /* We call these directly without PCI.  See asm/io.h. */
 123 EXPORT_SYMBOL(eisa_in8);
 124 EXPORT_SYMBOL(eisa_in16);
 125 EXPORT_SYMBOL(eisa_in32);
 126 EXPORT_SYMBOL(eisa_out8);
 127 EXPORT_SYMBOL(eisa_out16);
 128 EXPORT_SYMBOL(eisa_out32);
 129 #endif
 130
 131 /* Interrupt handling */
 132
 133 /* cached interrupt mask registers */
 134 static int master_mask;
 135 static int slave_mask;
 136
 137 /* the trig level can be set with the
 138  * eisa_irq_edge=n,n,n commandline parameter
 139  * We should really read this from the EEPROM
 140  * in the furure.
 141  */
 142 /* irq 13,8,2,1,0 must be edge */
 143 static unsigned int eisa_irq_level __read_mostly; /* default to edge triggered */
 144
 145
 146 /* called by free irq */
 147 static void eisa_disable_irq(unsigned int irq)
 148 {
 149         unsigned long flags;
 150
 151         EISA_DBG("disable irq %d\n", irq);
 152         /* just mask for now */
 153         spin_lock_irqsave(&eisa_irq_lock, flags);
 154         if (irq & 8) {
 155                 slave_mask |= (1 << (irq&7));
 156                 eisa_out8(slave_mask, 0xa1);
 157         } else {
 158                 master_mask |= (1 << (irq&7));
 159                 eisa_out8(master_mask, 0x21);
 160         }
 161         spin_unlock_irqrestore(&eisa_irq_lock, flags);
 162         EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21));
 163         EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1));
 164 }
 165
 166 /* called by request irq */
 167 static void eisa_enable_irq(unsigned int irq)
 168 {
 169         unsigned long flags;
 170         EISA_DBG("enable irq %d\n", irq);
 171
 172         spin_lock_irqsave(&eisa_irq_lock, flags);
 173         if (irq & 8) {
 174                 slave_mask &= ~(1 << (irq&7));
 175                 eisa_out8(slave_mask, 0xa1);
 176         } else {
 177                 master_mask &= ~(1 << (irq&7));
 178                 eisa_out8(master_mask, 0x21);
 179         }
 180         spin_unlock_irqrestore(&eisa_irq_lock, flags);
 181         EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21));
 182         EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1));
 183 }
 184
 185 static unsigned int eisa_startup_irq(unsigned int irq)
 186 {
 187         eisa_enable_irq(irq);
 188         return 0;
 189 }
 190
 191 static struct irq_chip eisa_interrupt_type = {
 192         .name    =      "EISA",
 193         .startup =      eisa_startup_irq,
 194         .shutdown =     eisa_disable_irq,
 195         .enable =       eisa_enable_irq,
 196         .disable =      eisa_disable_irq,
 197         .ack =          no_ack_irq,
 198         .end =          no_end_irq,
 199 };
 200
 201 static irqreturn_t eisa_irq(int wax_irq, void *intr_dev)
 202 {
 203         int irq = gsc_readb(0xfc01f000); /* EISA supports 16 irqs */
 204         unsigned long flags;
 205
 206         spin_lock_irqsave(&eisa_irq_lock, flags);
 207         /* read IRR command */
 208         eisa_out8(0x0a, 0x20);
 209         eisa_out8(0x0a, 0xa0);
 210
 211         EISA_DBG("irq IAR %02x 8259-1 irr %02x 8259-2 irr %02x\n",
 212                    irq, eisa_in8(0x20), eisa_in8(0xa0));
 213
 214         /* read ISR command */
 215         eisa_out8(0x0a, 0x20);
 216         eisa_out8(0x0a, 0xa0);
 217         EISA_DBG("irq 8259-1 isr %02x imr %02x 8259-2 isr %02x imr %02x\n",
 218                  eisa_in8(0x20), eisa_in8(0x21), eisa_in8(0xa0), eisa_in8(0xa1));
 219
 220         irq &= 0xf;
 221
 222         /* mask irq and write eoi */
 223         if (irq & 8) {
 224                 slave_mask |= (1 << (irq&7));
 225                 eisa_out8(slave_mask, 0xa1);
 226                 eisa_out8(0x60 | (irq&7),0xa0);/* 'Specific EOI' to slave */
 227                 eisa_out8(0x62,0x20);   /* 'Specific EOI' to master-IRQ2 */
 228
 229         } else {
 230                 master_mask |= (1 << (irq&7));
 231                 eisa_out8(master_mask, 0x21);
 232                 eisa_out8(0x60|irq,0x20);       /* 'Specific EOI' to master */
 233         }
 234         spin_unlock_irqrestore(&eisa_irq_lock, flags);
 235
 236         __do_IRQ(irq);
 237
 238         spin_lock_irqsave(&eisa_irq_lock, flags);
 239         /* unmask */
 240         if (irq & 8) {
 241                 slave_mask &= ~(1 << (irq&7));
 242                 eisa_out8(slave_mask, 0xa1);
 243         } else {
 244                 master_mask &= ~(1 << (irq&7));
 245                 eisa_out8(master_mask, 0x21);
 246         }
 247         spin_unlock_irqrestore(&eisa_irq_lock, flags);
 248         return IRQ_HANDLED;
 249 }
 250
 251 static irqreturn_t dummy_irq2_handler(int _, void *dev)
 252 {
 253         printk(KERN_ALERT "eisa: uhh, irq2?\n");
 254         return IRQ_HANDLED;
 255 }
 256
 257 static struct irqaction irq2_action = {
 258         .handler = dummy_irq2_handler,
 259         .name = "cascade",
 260 };
 261
 262 static void init_eisa_pic(void)
 263 {
 264         unsigned long flags;
 265
 266         spin_lock_irqsave(&eisa_irq_lock, flags);
 267
 268         eisa_out8(0xff, 0x21); /* mask during init */
 269         eisa_out8(0xff, 0xa1); /* mask during init */
 270
 271         /* master pic */
 272         eisa_out8(0x11,0x20); /* ICW1 */
 273         eisa_out8(0x00,0x21); /* ICW2 */
 274         eisa_out8(0x04,0x21); /* ICW3 */
 275         eisa_out8(0x01,0x21); /* ICW4 */
 276         eisa_out8(0x40,0x20); /* OCW2 */
 277
 278         /* slave pic */
 279         eisa_out8(0x11,0xa0); /* ICW1 */
 280         eisa_out8(0x08,0xa1); /* ICW2 */
 281         eisa_out8(0x02,0xa1); /* ICW3 */
 282         eisa_out8(0x01,0xa1); /* ICW4 */
 283         eisa_out8(0x40,0xa0); /* OCW2 */
 284
 285         udelay(100);
 286
 287         slave_mask = 0xff;
 288         master_mask = 0xfb;
 289         eisa_out8(slave_mask, 0xa1); /* OCW1 */
 290         eisa_out8(master_mask, 0x21); /* OCW1 */
 291
 292         /* setup trig level */
 293         EISA_DBG("EISA edge/level %04x\n", eisa_irq_level);
 294
 295         eisa_out8(eisa_irq_level&0xff, 0x4d0); /* Set all irq's to edge  */
 296         eisa_out8((eisa_irq_level >> 8) & 0xff, 0x4d1);
 297
 298         EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21));
 299         EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1));
 300         EISA_DBG("pic0 edge/level %02x\n", eisa_in8(0x4d0));
 301         EISA_DBG("pic1 edge/level %02x\n", eisa_in8(0x4d1));
 302
 303         spin_unlock_irqrestore(&eisa_irq_lock, flags);
 304 }
 305
 306 /* Device initialisation */
 307
 308 #define is_mongoose(dev) (dev->id.sversion == 0x00076)
 309
 310 static int __init eisa_probe(struct parisc_device *dev)
 311 {
 312         int i, result;
 313
 314         char *name = is_mongoose(dev) ? "Mongoose" : "Wax";
 315
 316         printk(KERN_INFO "%s EISA Adapter found at 0x%08lx\n",
 317                 name, (unsigned long)dev->hpa.start);
 318
 319         eisa_dev.hba.dev = dev;
 320         eisa_dev.hba.iommu = ccio_get_iommu(dev);
 321
 322         eisa_dev.hba.lmmio_space.name = "EISA";
 323         eisa_dev.hba.lmmio_space.start = F_EXTEND(0xfc000000);
 324         eisa_dev.hba.lmmio_space.end = F_EXTEND(0xffbfffff);
 325         eisa_dev.hba.lmmio_space.flags = IORESOURCE_MEM;
 326         result = ccio_request_resource(dev, &eisa_dev.hba.lmmio_space);
 327         if (result < 0) {
 328                 printk(KERN_ERR "EISA: failed to claim EISA Bus address space!\n");
 329                 return result;
 330         }
 331         eisa_dev.hba.io_space.name = "EISA";
 332         eisa_dev.hba.io_space.start = 0;
 333         eisa_dev.hba.io_space.end = 0xffff;
 334         eisa_dev.hba.lmmio_space.flags = IORESOURCE_IO;
 335         result = request_resource(&ioport_resource, &eisa_dev.hba.io_space);
 336         if (result < 0) {
 337                 printk(KERN_ERR "EISA: failed to claim EISA Bus port space!\n");
 338                 return result;
 339         }
 340         pcibios_register_hba(&eisa_dev.hba);
 341
 342         result = request_irq(dev->irq, eisa_irq, IRQF_SHARED, "EISA", &eisa_dev);
 343         if (result) {
 344                 printk(KERN_ERR "EISA: request_irq failed!\n");
 345                 return result;
 346         }
 347
 348         /* Reserve IRQ2 */
 349         irq_to_desc(2)->action = &irq2_action;
 350
 351         for (i = 0; i < 16; i++) {
 352                 irq_to_desc(i)->chip = &eisa_interrupt_type;
 353         }
 354
 355         EISA_bus = 1;
 356
 357         if (dev->num_addrs) {
 358                 /* newer firmware hand out the eeprom address */
 359                 eisa_dev.eeprom_addr = dev->addr[0];
 360         } else {
 361                 /* old firmware, need to figure out the box */
 362                 if (is_mongoose(dev)) {
 363                         eisa_dev.eeprom_addr = SNAKES_EEPROM_BASE_ADDR;
 364                 } else {
 365                         eisa_dev.eeprom_addr = MIRAGE_EEPROM_BASE_ADDR;
 366                 }
 367         }
 368         eisa_eeprom_addr = ioremap_nocache(eisa_dev.eeprom_addr, HPEE_MAX_LENGTH);
 369         result = eisa_enumerator(eisa_dev.eeprom_addr, &eisa_dev.hba.io_space,
 370                         &eisa_dev.hba.lmmio_space);
 371         init_eisa_pic();
 372
 373         if (result >= 0) {
 374                 /* FIXME : Don't enumerate the bus twice. */
 375                 eisa_dev.root.dev = &dev->dev;
 376                 dev_set_drvdata(&dev->dev, &eisa_dev.root);
 377                 eisa_dev.root.bus_base_addr = 0;
 378                 eisa_dev.root.res = &eisa_dev.hba.io_space;
 379                 eisa_dev.root.slots = result;
 380                 eisa_dev.root.dma_mask = 0xffffffff; /* wild guess */
 381                 if (eisa_root_register (&eisa_dev.root)) {
 382                         printk(KERN_ERR "EISA: Failed to register EISA root\n");
 383                         return -1;
 384                 }
 385         }
 386
 387         return 0;
 388 }
 389
 390 static const struct parisc_device_id eisa_tbl[] = {
 391         { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00076 }, /* Mongoose */
 392         { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00090 }, /* Wax EISA */
 393         { 0, }
 394 };
 395
 396 MODULE_DEVICE_TABLE(parisc, eisa_tbl);
 397
 398 static struct parisc_driver eisa_driver = {
 399         .name =         "eisa_ba",
 400         .id_table =     eisa_tbl,
 401         .probe =        eisa_probe,
 402 };
 403
 404 void __init eisa_init(void)
 405 {
 406         register_parisc_driver(&eisa_driver);
 407 }
 408
 409
 410 static unsigned int eisa_irq_configured;
 411 void eisa_make_irq_level(int num)
 412 {
 413         if (eisa_irq_configured& (1<<num)) {
 414                 printk(KERN_WARNING
 415                        "IRQ %d polarity configured twice (last to level)\n",
 416                        num);
 417         }
 418         eisa_irq_level |= (1<<num); /* set the corresponding bit */
 419         eisa_irq_configured |= (1<<num); /* set the corresponding bit */
 420 }
 421
 422 void eisa_make_irq_edge(int num)
 423 {
 424         if (eisa_irq_configured& (1<<num)) {
 425                 printk(KERN_WARNING
 426                        "IRQ %d polarity configured twice (last to edge)\n",
 427                        num);
 428         }
 429         eisa_irq_level &= ~(1<<num); /* clear the corresponding bit */
 430         eisa_irq_configured |= (1<<num); /* set the corresponding bit */
 431 }
 432
 433 static int __init eisa_irq_setup(char *str)
 434 {
 435         char *cur = str;
 436         int val;
 437
 438         EISA_DBG("IRQ setup\n");
 439         while (cur != NULL) {
 440                 char *pe;
 441
 442                 val = (int) simple_strtoul(cur, &pe, 0);
 443                 if (val > 15 || val < 0) {
 444                         printk(KERN_ERR "eisa: EISA irq value are 0-15\n");
 445                         continue;
 446                 }
 447                 if (val == 2) {
 448                         val = 9;
 449                 }
 450                 eisa_make_irq_edge(val); /* clear the corresponding bit */
 451                 EISA_DBG("setting IRQ %d to edge-triggered mode\n", val);
 452
 453                 if ((cur = strchr(cur, ','))) {
 454                         cur++;
 455                 } else {
 456                         break;
 457                 }
 458         }
 459         return 1;
 460 }
 461
 462 __setup("eisa_irq_edge=", eisa_irq_setup);
 463