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_mask_irq(struct irq_data *d)
 148 {
 149         unsigned int irq = d->irq;
 150         unsigned long flags;
 151
 152         EISA_DBG("disable irq %d\n", irq);
 153         /* just mask for now */
 154         spin_lock_irqsave(&eisa_irq_lock, flags);
 155         if (irq & 8) {
 156                 slave_mask |= (1 << (irq&7));
 157                 eisa_out8(slave_mask, 0xa1);
 158         } else {
 159                 master_mask |= (1 << (irq&7));
 160                 eisa_out8(master_mask, 0x21);
 161         }
 162         spin_unlock_irqrestore(&eisa_irq_lock, flags);
 163         EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21));
 164         EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1));
 165 }
 166
 167 /* called by request irq */
 168 static void eisa_unmask_irq(struct irq_data *d)
 169 {
 170         unsigned int irq = d->irq;
 171         unsigned long flags;
 172         EISA_DBG("enable irq %d\n", irq);
 173
 174         spin_lock_irqsave(&eisa_irq_lock, flags);
 175         if (irq & 8) {
 176                 slave_mask &= ~(1 << (irq&7));
 177                 eisa_out8(slave_mask, 0xa1);
 178         } else {
 179                 master_mask &= ~(1 << (irq&7));
 180                 eisa_out8(master_mask, 0x21);
 181         }
 182         spin_unlock_irqrestore(&eisa_irq_lock, flags);
 183         EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21));
 184         EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1));
 185 }
 186
 187 static struct irq_chip eisa_interrupt_type = {
 188         .name           =       "EISA",
 189         .irq_unmask     =       eisa_unmask_irq,
 190         .irq_mask       =       eisa_mask_irq,
 191 };
 192
 193 static irqreturn_t eisa_irq(int wax_irq, void *intr_dev)
 194 {
 195         int irq = gsc_readb(0xfc01f000); /* EISA supports 16 irqs */
 196         unsigned long flags;
 197
 198         spin_lock_irqsave(&eisa_irq_lock, flags);
 199         /* read IRR command */
 200         eisa_out8(0x0a, 0x20);
 201         eisa_out8(0x0a, 0xa0);
 202
 203         EISA_DBG("irq IAR %02x 8259-1 irr %02x 8259-2 irr %02x\n",
 204                    irq, eisa_in8(0x20), eisa_in8(0xa0));
 205
 206         /* read ISR command */
 207         eisa_out8(0x0a, 0x20);
 208         eisa_out8(0x0a, 0xa0);
 209         EISA_DBG("irq 8259-1 isr %02x imr %02x 8259-2 isr %02x imr %02x\n",
 210                  eisa_in8(0x20), eisa_in8(0x21), eisa_in8(0xa0), eisa_in8(0xa1));
 211
 212         irq &= 0xf;
 213
 214         /* mask irq and write eoi */
 215         if (irq & 8) {
 216                 slave_mask |= (1 << (irq&7));
 217                 eisa_out8(slave_mask, 0xa1);
 218                 eisa_out8(0x60 | (irq&7),0xa0);/* 'Specific EOI' to slave */
 219                 eisa_out8(0x62, 0x20);  /* 'Specific EOI' to master-IRQ2 */
 220
 221         } else {
 222                 master_mask |= (1 << (irq&7));
 223                 eisa_out8(master_mask, 0x21);
 224                 eisa_out8(0x60|irq, 0x20);      /* 'Specific EOI' to master */
 225         }
 226         spin_unlock_irqrestore(&eisa_irq_lock, flags);
 227
 228         generic_handle_irq(irq);
 229
 230         spin_lock_irqsave(&eisa_irq_lock, flags);
 231         /* unmask */
 232         if (irq & 8) {
 233                 slave_mask &= ~(1 << (irq&7));
 234                 eisa_out8(slave_mask, 0xa1);
 235         } else {
 236                 master_mask &= ~(1 << (irq&7));
 237                 eisa_out8(master_mask, 0x21);
 238         }
 239         spin_unlock_irqrestore(&eisa_irq_lock, flags);
 240         return IRQ_HANDLED;
 241 }
 242
 243 static irqreturn_t dummy_irq2_handler(int _, void *dev)
 244 {
 245         printk(KERN_ALERT "eisa: uhh, irq2?\n");
 246         return IRQ_HANDLED;
 247 }
 248
 249 static struct irqaction irq2_action = {
 250         .handler = dummy_irq2_handler,
 251         .name = "cascade",
 252 };
 253
 254 static void init_eisa_pic(void)
 255 {
 256         unsigned long flags;
 257
 258         spin_lock_irqsave(&eisa_irq_lock, flags);
 259
 260         eisa_out8(0xff, 0x21); /* mask during init */
 261         eisa_out8(0xff, 0xa1); /* mask during init */
 262
 263         /* master pic */
 264         eisa_out8(0x11, 0x20); /* ICW1 */
 265         eisa_out8(0x00, 0x21); /* ICW2 */
 266         eisa_out8(0x04, 0x21); /* ICW3 */
 267         eisa_out8(0x01, 0x21); /* ICW4 */
 268         eisa_out8(0x40, 0x20); /* OCW2 */
 269
 270         /* slave pic */
 271         eisa_out8(0x11, 0xa0); /* ICW1 */
 272         eisa_out8(0x08, 0xa1); /* ICW2 */
 273         eisa_out8(0x02, 0xa1); /* ICW3 */
 274         eisa_out8(0x01, 0xa1); /* ICW4 */
 275         eisa_out8(0x40, 0xa0); /* OCW2 */
 276
 277         udelay(100);
 278
 279         slave_mask = 0xff;
 280         master_mask = 0xfb;
 281         eisa_out8(slave_mask, 0xa1); /* OCW1 */
 282         eisa_out8(master_mask, 0x21); /* OCW1 */
 283
 284         /* setup trig level */
 285         EISA_DBG("EISA edge/level %04x\n", eisa_irq_level);
 286
 287         eisa_out8(eisa_irq_level&0xff, 0x4d0); /* Set all irq's to edge  */
 288         eisa_out8((eisa_irq_level >> 8) & 0xff, 0x4d1);
 289
 290         EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21));
 291         EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1));
 292         EISA_DBG("pic0 edge/level %02x\n", eisa_in8(0x4d0));
 293         EISA_DBG("pic1 edge/level %02x\n", eisa_in8(0x4d1));
 294
 295         spin_unlock_irqrestore(&eisa_irq_lock, flags);
 296 }
 297
 298 /* Device initialisation */
 299
 300 #define is_mongoose(dev) (dev->id.sversion == 0x00076)
 301
 302 static int __init eisa_probe(struct parisc_device *dev)
 303 {
 304         int i, result;
 305
 306         char *name = is_mongoose(dev) ? "Mongoose" : "Wax";
 307
 308         printk(KERN_INFO "%s EISA Adapter found at 0x%08lx\n",
 309                 name, (unsigned long)dev->hpa.start);
 310
 311         eisa_dev.hba.dev = dev;
 312         eisa_dev.hba.iommu = ccio_get_iommu(dev);
 313
 314         eisa_dev.hba.lmmio_space.name = "EISA";
 315         eisa_dev.hba.lmmio_space.start = F_EXTEND(0xfc000000);
 316         eisa_dev.hba.lmmio_space.end = F_EXTEND(0xffbfffff);
 317         eisa_dev.hba.lmmio_space.flags = IORESOURCE_MEM;
 318         result = ccio_request_resource(dev, &eisa_dev.hba.lmmio_space);
 319         if (result < 0) {
 320                 printk(KERN_ERR "EISA: failed to claim EISA Bus address space!\n");
 321                 return result;
 322         }
 323         eisa_dev.hba.io_space.name = "EISA";
 324         eisa_dev.hba.io_space.start = 0;
 325         eisa_dev.hba.io_space.end = 0xffff;
 326         eisa_dev.hba.lmmio_space.flags = IORESOURCE_IO;
 327         result = request_resource(&ioport_resource, &eisa_dev.hba.io_space);
 328         if (result < 0) {
 329                 printk(KERN_ERR "EISA: failed to claim EISA Bus port space!\n");
 330                 return result;
 331         }
 332         pcibios_register_hba(&eisa_dev.hba);
 333
 334         result = request_irq(dev->irq, eisa_irq, IRQF_SHARED, "EISA", &eisa_dev);
 335         if (result) {
 336                 printk(KERN_ERR "EISA: request_irq failed!\n");
 337                 goto error_release;
 338         }
 339
 340         /* Reserve IRQ2 */
 341         setup_irq(2, &irq2_action);
 342         for (i = 0; i < 16; i++) {
 343                 irq_set_chip_and_handler(i, &eisa_interrupt_type,
 344                                          handle_simple_irq);
 345         }
 346
 347         EISA_bus = 1;
 348
 349         if (dev->num_addrs) {
 350                 /* newer firmware hand out the eeprom address */
 351                 eisa_dev.eeprom_addr = dev->addr[0];
 352         } else {
 353                 /* old firmware, need to figure out the box */
 354                 if (is_mongoose(dev)) {
 355                         eisa_dev.eeprom_addr = SNAKES_EEPROM_BASE_ADDR;
 356                 } else {
 357                         eisa_dev.eeprom_addr = MIRAGE_EEPROM_BASE_ADDR;
 358                 }
 359         }
 360         eisa_eeprom_addr = ioremap_nocache(eisa_dev.eeprom_addr, HPEE_MAX_LENGTH);
 361         if (!eisa_eeprom_addr) {
 362                 result = -ENOMEM;
 363                 printk(KERN_ERR "EISA: ioremap_nocache failed!\n");
 364                 goto error_free_irq;
 365         }
 366         result = eisa_enumerator(eisa_dev.eeprom_addr, &eisa_dev.hba.io_space,
 367                         &eisa_dev.hba.lmmio_space);
 368         init_eisa_pic();
 369
 370         if (result >= 0) {
 371                 /* FIXME : Don't enumerate the bus twice. */
 372                 eisa_dev.root.dev = &dev->dev;
 373                 dev_set_drvdata(&dev->dev, &eisa_dev.root);
 374                 eisa_dev.root.bus_base_addr = 0;
 375                 eisa_dev.root.res = &eisa_dev.hba.io_space;
 376                 eisa_dev.root.slots = result;
 377                 eisa_dev.root.dma_mask = 0xffffffff; /* wild guess */
 378                 if (eisa_root_register (&eisa_dev.root)) {
 379                         printk(KERN_ERR "EISA: Failed to register EISA root\n");
 380                         result = -ENOMEM;
 381                         goto error_iounmap;
 382                 }
 383         }
 384
 385         return 0;
 386
 387 error_iounmap:
 388         iounmap(eisa_eeprom_addr);
 389 error_free_irq:
 390         free_irq(dev->irq, &eisa_dev);
 391 error_release:
 392         release_resource(&eisa_dev.hba.io_space);
 393         return result;
 394 }
 395
 396 static const struct parisc_device_id eisa_tbl[] __initconst = {
 397         { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00076 }, /* Mongoose */
 398         { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00090 }, /* Wax EISA */
 399         { 0, }
 400 };
 401
 402 MODULE_DEVICE_TABLE(parisc, eisa_tbl);
 403
 404 static struct parisc_driver eisa_driver __refdata = {
 405         .name =         "eisa_ba",
 406         .id_table =     eisa_tbl,
 407         .probe =        eisa_probe,
 408 };
 409
 410 void __init eisa_init(void)
 411 {
 412         register_parisc_driver(&eisa_driver);
 413 }
 414
 415
 416 static unsigned int eisa_irq_configured;
 417 void eisa_make_irq_level(int num)
 418 {
 419         if (eisa_irq_configured& (1<<num)) {
 420                 printk(KERN_WARNING
 421                        "IRQ %d polarity configured twice (last to level)\n",
 422                        num);
 423         }
 424         eisa_irq_level |= (1<<num); /* set the corresponding bit */
 425         eisa_irq_configured |= (1<<num); /* set the corresponding bit */
 426 }
 427
 428 void eisa_make_irq_edge(int num)
 429 {
 430         if (eisa_irq_configured& (1<<num)) {
 431                 printk(KERN_WARNING
 432                        "IRQ %d polarity configured twice (last to edge)\n",
 433                        num);
 434         }
 435         eisa_irq_level &= ~(1<<num); /* clear the corresponding bit */
 436         eisa_irq_configured |= (1<<num); /* set the corresponding bit */
 437 }
 438
 439 static int __init eisa_irq_setup(char *str)
 440 {
 441         char *cur = str;
 442         int val;
 443
 444         EISA_DBG("IRQ setup\n");
 445         while (cur != NULL) {
 446                 char *pe;
 447
 448                 val = (int) simple_strtoul(cur, &pe, 0);
 449                 if (val > 15 || val < 0) {
 450                         printk(KERN_ERR "eisa: EISA irq value are 0-15\n");
 451                         continue;
 452                 }
 453                 if (val == 2) {
 454                         val = 9;
 455                 }
 456                 eisa_make_irq_edge(val); /* clear the corresponding bit */
 457                 EISA_DBG("setting IRQ %d to edge-triggered mode\n", val);
 458
 459                 if ((cur = strchr(cur, ','))) {
 460                         cur++;
 461                 } else {
 462                         break;
 463                 }
 464         }
 465         return 1;
 466 }
 467
 468 __setup("eisa_irq_edge=", eisa_irq_setup);
 469