1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * eisa.c - provide support for EISA adapters in PA-RISC machines 4 * 5 * Copyright (c) 2001 Matthew Wilcox for Hewlett Packard 6 * Copyright (c) 2001 Daniel Engstrom <5116@telia.com> 7 * 8 * There are two distinct EISA adapters. Mongoose is found in machines 9 * before the 712; then the Wax ASIC is used. To complicate matters, the 10 * Wax ASIC also includes a PS/2 and RS-232 controller, but those are 11 * dealt with elsewhere; this file is concerned only with the EISA portions 12 * of Wax. 13 * 14 * HINT: 15 * ----- 16 * To allow an ISA card to work properly in the EISA slot you need to 17 * set an edge trigger level. This may be done on the palo command line 18 * by adding the kernel parameter "eisa_irq_edge=n,n2,[...]]", with 19 * n and n2 as the irq levels you want to use. 20 * 21 * Example: "eisa_irq_edge=10,11" allows ISA cards to operate at 22 * irq levels 10 and 11. 23 */ 24 25 #include <linux/init.h> 26 #include <linux/ioport.h> 27 #include <linux/interrupt.h> 28 #include <linux/kernel.h> 29 #include <linux/module.h> 30 #include <linux/pci.h> 31 #include <linux/spinlock.h> 32 #include <linux/eisa.h> 33 34 #include <asm/byteorder.h> 35 #include <asm/io.h> 36 #include <asm/hardware.h> 37 #include <asm/processor.h> 38 #include <asm/parisc-device.h> 39 #include <asm/delay.h> 40 #include <asm/eisa_bus.h> 41 #include <asm/eisa_eeprom.h> 42 43 #include "iommu.h" 44 45 #if 0 46 #define EISA_DBG(msg, arg...) printk(KERN_DEBUG "eisa: " msg, ## arg) 47 #else 48 #define EISA_DBG(msg, arg...) 49 #endif 50 51 #define SNAKES_EEPROM_BASE_ADDR 0xF0810400 52 #define MIRAGE_EEPROM_BASE_ADDR 0xF00C0400 53 54 static DEFINE_SPINLOCK(eisa_irq_lock); 55 56 void __iomem *eisa_eeprom_addr __read_mostly; 57 58 /* We can only have one EISA adapter in the system because neither 59 * implementation can be flexed. 60 */ 61 static struct eisa_ba { 62 struct pci_hba_data hba; 63 unsigned long eeprom_addr; 64 struct eisa_root_device root; 65 } eisa_dev; 66 67 /* Port ops */ 68 69 static inline unsigned long eisa_permute(unsigned short port) 70 { 71 if (port & 0x300) { 72 return 0xfc000000 | ((port & 0xfc00) >> 6) 73 | ((port & 0x3f8) << 9) | (port & 7); 74 } else { 75 return 0xfc000000 | port; 76 } 77 } 78 79 unsigned char eisa_in8(unsigned short port) 80 { 81 if (EISA_bus) 82 return gsc_readb(eisa_permute(port)); 83 return 0xff; 84 } 85 86 unsigned short eisa_in16(unsigned short port) 87 { 88 if (EISA_bus) 89 return le16_to_cpu(gsc_readw(eisa_permute(port))); 90 return 0xffff; 91 } 92 93 unsigned int eisa_in32(unsigned short port) 94 { 95 if (EISA_bus) 96 return le32_to_cpu(gsc_readl(eisa_permute(port))); 97 return 0xffffffff; 98 } 99 100 void eisa_out8(unsigned char data, unsigned short port) 101 { 102 if (EISA_bus) 103 gsc_writeb(data, eisa_permute(port)); 104 } 105 106 void eisa_out16(unsigned short data, unsigned short port) 107 { 108 if (EISA_bus) 109 gsc_writew(cpu_to_le16(data), eisa_permute(port)); 110 } 111 112 void eisa_out32(unsigned int data, unsigned short port) 113 { 114 if (EISA_bus) 115 gsc_writel(cpu_to_le32(data), eisa_permute(port)); 116 } 117 118 #ifndef CONFIG_PCI 119 /* We call these directly without PCI. See asm/io.h. */ 120 EXPORT_SYMBOL(eisa_in8); 121 EXPORT_SYMBOL(eisa_in16); 122 EXPORT_SYMBOL(eisa_in32); 123 EXPORT_SYMBOL(eisa_out8); 124 EXPORT_SYMBOL(eisa_out16); 125 EXPORT_SYMBOL(eisa_out32); 126 #endif 127 128 /* Interrupt handling */ 129 130 /* cached interrupt mask registers */ 131 static int master_mask; 132 static int slave_mask; 133 134 /* the trig level can be set with the 135 * eisa_irq_edge=n,n,n commandline parameter 136 * We should really read this from the EEPROM 137 * in the furure. 138 */ 139 /* irq 13,8,2,1,0 must be edge */ 140 static unsigned int eisa_irq_level __read_mostly; /* default to edge triggered */ 141 142 143 /* called by free irq */ 144 static void eisa_mask_irq(struct irq_data *d) 145 { 146 unsigned int irq = d->irq; 147 unsigned long flags; 148 149 EISA_DBG("disable irq %d\n", irq); 150 /* just mask for now */ 151 spin_lock_irqsave(&eisa_irq_lock, flags); 152 if (irq & 8) { 153 slave_mask |= (1 << (irq&7)); 154 eisa_out8(slave_mask, 0xa1); 155 } else { 156 master_mask |= (1 << (irq&7)); 157 eisa_out8(master_mask, 0x21); 158 } 159 spin_unlock_irqrestore(&eisa_irq_lock, flags); 160 EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21)); 161 EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1)); 162 } 163 164 /* called by request irq */ 165 static void eisa_unmask_irq(struct irq_data *d) 166 { 167 unsigned int irq = d->irq; 168 unsigned long flags; 169 EISA_DBG("enable irq %d\n", irq); 170 171 spin_lock_irqsave(&eisa_irq_lock, flags); 172 if (irq & 8) { 173 slave_mask &= ~(1 << (irq&7)); 174 eisa_out8(slave_mask, 0xa1); 175 } else { 176 master_mask &= ~(1 << (irq&7)); 177 eisa_out8(master_mask, 0x21); 178 } 179 spin_unlock_irqrestore(&eisa_irq_lock, flags); 180 EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21)); 181 EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1)); 182 } 183 184 static struct irq_chip eisa_interrupt_type = { 185 .name = "EISA", 186 .irq_unmask = eisa_unmask_irq, 187 .irq_mask = eisa_mask_irq, 188 }; 189 190 static irqreturn_t eisa_irq(int wax_irq, void *intr_dev) 191 { 192 int irq = gsc_readb(0xfc01f000); /* EISA supports 16 irqs */ 193 unsigned long flags; 194 195 spin_lock_irqsave(&eisa_irq_lock, flags); 196 /* read IRR command */ 197 eisa_out8(0x0a, 0x20); 198 eisa_out8(0x0a, 0xa0); 199 200 EISA_DBG("irq IAR %02x 8259-1 irr %02x 8259-2 irr %02x\n", 201 irq, eisa_in8(0x20), eisa_in8(0xa0)); 202 203 /* read ISR command */ 204 eisa_out8(0x0a, 0x20); 205 eisa_out8(0x0a, 0xa0); 206 EISA_DBG("irq 8259-1 isr %02x imr %02x 8259-2 isr %02x imr %02x\n", 207 eisa_in8(0x20), eisa_in8(0x21), eisa_in8(0xa0), eisa_in8(0xa1)); 208 209 irq &= 0xf; 210 211 /* mask irq and write eoi */ 212 if (irq & 8) { 213 slave_mask |= (1 << (irq&7)); 214 eisa_out8(slave_mask, 0xa1); 215 eisa_out8(0x60 | (irq&7),0xa0);/* 'Specific EOI' to slave */ 216 eisa_out8(0x62, 0x20); /* 'Specific EOI' to master-IRQ2 */ 217 218 } else { 219 master_mask |= (1 << (irq&7)); 220 eisa_out8(master_mask, 0x21); 221 eisa_out8(0x60|irq, 0x20); /* 'Specific EOI' to master */ 222 } 223 spin_unlock_irqrestore(&eisa_irq_lock, flags); 224 225 generic_handle_irq(irq); 226 227 spin_lock_irqsave(&eisa_irq_lock, flags); 228 /* unmask */ 229 if (irq & 8) { 230 slave_mask &= ~(1 << (irq&7)); 231 eisa_out8(slave_mask, 0xa1); 232 } else { 233 master_mask &= ~(1 << (irq&7)); 234 eisa_out8(master_mask, 0x21); 235 } 236 spin_unlock_irqrestore(&eisa_irq_lock, flags); 237 return IRQ_HANDLED; 238 } 239 240 static irqreturn_t dummy_irq2_handler(int _, void *dev) 241 { 242 printk(KERN_ALERT "eisa: uhh, irq2?\n"); 243 return IRQ_HANDLED; 244 } 245 246 static void init_eisa_pic(void) 247 { 248 unsigned long flags; 249 250 spin_lock_irqsave(&eisa_irq_lock, flags); 251 252 eisa_out8(0xff, 0x21); /* mask during init */ 253 eisa_out8(0xff, 0xa1); /* mask during init */ 254 255 /* master pic */ 256 eisa_out8(0x11, 0x20); /* ICW1 */ 257 eisa_out8(0x00, 0x21); /* ICW2 */ 258 eisa_out8(0x04, 0x21); /* ICW3 */ 259 eisa_out8(0x01, 0x21); /* ICW4 */ 260 eisa_out8(0x40, 0x20); /* OCW2 */ 261 262 /* slave pic */ 263 eisa_out8(0x11, 0xa0); /* ICW1 */ 264 eisa_out8(0x08, 0xa1); /* ICW2 */ 265 eisa_out8(0x02, 0xa1); /* ICW3 */ 266 eisa_out8(0x01, 0xa1); /* ICW4 */ 267 eisa_out8(0x40, 0xa0); /* OCW2 */ 268 269 udelay(100); 270 271 slave_mask = 0xff; 272 master_mask = 0xfb; 273 eisa_out8(slave_mask, 0xa1); /* OCW1 */ 274 eisa_out8(master_mask, 0x21); /* OCW1 */ 275 276 /* setup trig level */ 277 EISA_DBG("EISA edge/level %04x\n", eisa_irq_level); 278 279 eisa_out8(eisa_irq_level&0xff, 0x4d0); /* Set all irq's to edge */ 280 eisa_out8((eisa_irq_level >> 8) & 0xff, 0x4d1); 281 282 EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21)); 283 EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1)); 284 EISA_DBG("pic0 edge/level %02x\n", eisa_in8(0x4d0)); 285 EISA_DBG("pic1 edge/level %02x\n", eisa_in8(0x4d1)); 286 287 spin_unlock_irqrestore(&eisa_irq_lock, flags); 288 } 289 290 /* Device initialisation */ 291 292 #define is_mongoose(dev) (dev->id.sversion == 0x00076) 293 294 static int __init eisa_probe(struct parisc_device *dev) 295 { 296 int i, result; 297 298 char *name = is_mongoose(dev) ? "Mongoose" : "Wax"; 299 300 printk(KERN_INFO "%s EISA Adapter found at 0x%08lx\n", 301 name, (unsigned long)dev->hpa.start); 302 303 eisa_dev.hba.dev = dev; 304 eisa_dev.hba.iommu = ccio_get_iommu(dev); 305 306 eisa_dev.hba.lmmio_space.name = "EISA"; 307 eisa_dev.hba.lmmio_space.start = F_EXTEND(0xfc000000); 308 eisa_dev.hba.lmmio_space.end = F_EXTEND(0xffbfffff); 309 eisa_dev.hba.lmmio_space.flags = IORESOURCE_MEM; 310 result = ccio_request_resource(dev, &eisa_dev.hba.lmmio_space); 311 if (result < 0) { 312 printk(KERN_ERR "EISA: failed to claim EISA Bus address space!\n"); 313 return result; 314 } 315 eisa_dev.hba.io_space.name = "EISA"; 316 eisa_dev.hba.io_space.start = 0; 317 eisa_dev.hba.io_space.end = 0xffff; 318 eisa_dev.hba.lmmio_space.flags = IORESOURCE_IO; 319 result = request_resource(&ioport_resource, &eisa_dev.hba.io_space); 320 if (result < 0) { 321 printk(KERN_ERR "EISA: failed to claim EISA Bus port space!\n"); 322 return result; 323 } 324 pcibios_register_hba(&eisa_dev.hba); 325 326 result = request_irq(dev->irq, eisa_irq, IRQF_SHARED, "EISA", &eisa_dev); 327 if (result) { 328 printk(KERN_ERR "EISA: request_irq failed!\n"); 329 goto error_release; 330 } 331 332 /* Reserve IRQ2 */ 333 if (request_irq(2, dummy_irq2_handler, 0, "cascade", NULL)) 334 pr_err("Failed to request irq 2 (cascade)\n"); 335 for (i = 0; i < 16; i++) { 336 irq_set_chip_and_handler(i, &eisa_interrupt_type, 337 handle_simple_irq); 338 } 339 340 EISA_bus = 1; 341 342 if (dev->num_addrs) { 343 /* newer firmware hand out the eeprom address */ 344 eisa_dev.eeprom_addr = dev->addr[0]; 345 } else { 346 /* old firmware, need to figure out the box */ 347 if (is_mongoose(dev)) { 348 eisa_dev.eeprom_addr = SNAKES_EEPROM_BASE_ADDR; 349 } else { 350 eisa_dev.eeprom_addr = MIRAGE_EEPROM_BASE_ADDR; 351 } 352 } 353 eisa_eeprom_addr = ioremap(eisa_dev.eeprom_addr, HPEE_MAX_LENGTH); 354 if (!eisa_eeprom_addr) { 355 result = -ENOMEM; 356 printk(KERN_ERR "EISA: ioremap failed!\n"); 357 goto error_free_irq; 358 } 359 result = eisa_enumerator(eisa_dev.eeprom_addr, &eisa_dev.hba.io_space, 360 &eisa_dev.hba.lmmio_space); 361 init_eisa_pic(); 362 363 if (result >= 0) { 364 /* FIXME : Don't enumerate the bus twice. */ 365 eisa_dev.root.dev = &dev->dev; 366 dev_set_drvdata(&dev->dev, &eisa_dev.root); 367 eisa_dev.root.bus_base_addr = 0; 368 eisa_dev.root.res = &eisa_dev.hba.io_space; 369 eisa_dev.root.slots = result; 370 eisa_dev.root.dma_mask = 0xffffffff; /* wild guess */ 371 if (eisa_root_register (&eisa_dev.root)) { 372 printk(KERN_ERR "EISA: Failed to register EISA root\n"); 373 result = -ENOMEM; 374 goto error_iounmap; 375 } 376 } 377 378 return 0; 379 380 error_iounmap: 381 iounmap(eisa_eeprom_addr); 382 error_free_irq: 383 free_irq(dev->irq, &eisa_dev); 384 error_release: 385 release_resource(&eisa_dev.hba.io_space); 386 return result; 387 } 388 389 static const struct parisc_device_id eisa_tbl[] __initconst = { 390 { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00076 }, /* Mongoose */ 391 { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00090 }, /* Wax EISA */ 392 { 0, } 393 }; 394 395 MODULE_DEVICE_TABLE(parisc, eisa_tbl); 396 397 static struct parisc_driver eisa_driver __refdata = { 398 .name = "eisa_ba", 399 .id_table = eisa_tbl, 400 .probe = eisa_probe, 401 }; 402 403 void __init eisa_init(void) 404 { 405 register_parisc_driver(&eisa_driver); 406 } 407 408 409 static unsigned int eisa_irq_configured; 410 void eisa_make_irq_level(int num) 411 { 412 if (eisa_irq_configured& (1<<num)) { 413 printk(KERN_WARNING 414 "IRQ %d polarity configured twice (last to level)\n", 415 num); 416 } 417 eisa_irq_level |= (1<<num); /* set the corresponding bit */ 418 eisa_irq_configured |= (1<<num); /* set the corresponding bit */ 419 } 420 421 void eisa_make_irq_edge(int num) 422 { 423 if (eisa_irq_configured& (1<<num)) { 424 printk(KERN_WARNING 425 "IRQ %d polarity configured twice (last to edge)\n", 426 num); 427 } 428 eisa_irq_level &= ~(1<<num); /* clear the corresponding bit */ 429 eisa_irq_configured |= (1<<num); /* set the corresponding bit */ 430 } 431 432 static int __init eisa_irq_setup(char *str) 433 { 434 char *cur = str; 435 int val; 436 437 EISA_DBG("IRQ setup\n"); 438 while (cur != NULL) { 439 char *pe; 440 441 val = (int) simple_strtoul(cur, &pe, 0); 442 if (val > 15 || val < 0) { 443 printk(KERN_ERR "eisa: EISA irq value are 0-15\n"); 444 continue; 445 } 446 if (val == 2) { 447 val = 9; 448 } 449 eisa_make_irq_edge(val); /* clear the corresponding bit */ 450 EISA_DBG("setting IRQ %d to edge-triggered mode\n", val); 451 452 if ((cur = strchr(cur, ','))) { 453 cur++; 454 } else { 455 break; 456 } 457 } 458 return 1; 459 } 460 461 __setup("eisa_irq_edge=", eisa_irq_setup); 462 463