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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#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
57static DEFINE_SPINLOCK(eisa_irq_lock);
58
Helge Deller8039de12006-01-10 20:35:03 -050059void __iomem *eisa_eeprom_addr __read_mostly;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060
61/* We can only have one EISA adapter in the system because neither
62 * implementation can be flexed.
63 */
64static 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
72static 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
82unsigned char eisa_in8(unsigned short port)
83{
84 if (EISA_bus)
85 return gsc_readb(eisa_permute(port));
86 return 0xff;
87}
88
89unsigned 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
96unsigned 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
103void eisa_out8(unsigned char data, unsigned short port)
104{
105 if (EISA_bus)
106 gsc_writeb(data, eisa_permute(port));
107}
108
109void 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
115void 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. */
123EXPORT_SYMBOL(eisa_in8);
124EXPORT_SYMBOL(eisa_in16);
125EXPORT_SYMBOL(eisa_in32);
126EXPORT_SYMBOL(eisa_out8);
127EXPORT_SYMBOL(eisa_out16);
128EXPORT_SYMBOL(eisa_out32);
129#endif
130
131/* Interrupt handling */
132
133/* cached interrupt mask registers */
134static int master_mask;
135static 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 */
Helge Deller8039de12006-01-10 20:35:03 -0500143static unsigned int eisa_irq_level __read_mostly; /* default to edge triggered */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144
145
146/* called by free irq */
Kyle McMartin8ed5c002010-10-14 01:00:51 -0400147static void eisa_mask_irq(unsigned int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148{
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 */
Kyle McMartin8ed5c002010-10-14 01:00:51 -0400167static void eisa_unmask_irq(unsigned int irq)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168{
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
Thomas Gleixnerdfe07562009-06-10 19:56:04 +0000185static struct irq_chip eisa_interrupt_type = {
Kyle McMartin8ed5c002010-10-14 01:00:51 -0400186 .name = "EISA",
187 .unmask = eisa_unmask_irq,
188 .mask = eisa_mask_irq,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189};
190
David Howells7d12e782006-10-05 14:55:46 +0100191static irqreturn_t eisa_irq(int wax_irq, void *intr_dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192{
193 int irq = gsc_readb(0xfc01f000); /* EISA supports 16 irqs */
194 unsigned long flags;
195
196 spin_lock_irqsave(&eisa_irq_lock, flags);
197 /* read IRR command */
198 eisa_out8(0x0a, 0x20);
199 eisa_out8(0x0a, 0xa0);
200
201 EISA_DBG("irq IAR %02x 8259-1 irr %02x 8259-2 irr %02x\n",
202 irq, eisa_in8(0x20), eisa_in8(0xa0));
203
204 /* read ISR command */
205 eisa_out8(0x0a, 0x20);
206 eisa_out8(0x0a, 0xa0);
207 EISA_DBG("irq 8259-1 isr %02x imr %02x 8259-2 isr %02x imr %02x\n",
208 eisa_in8(0x20), eisa_in8(0x21), eisa_in8(0xa0), eisa_in8(0xa1));
209
210 irq &= 0xf;
211
212 /* mask irq and write eoi */
213 if (irq & 8) {
214 slave_mask |= (1 << (irq&7));
215 eisa_out8(slave_mask, 0xa1);
216 eisa_out8(0x60 | (irq&7),0xa0);/* 'Specific EOI' to slave */
217 eisa_out8(0x62,0x20); /* 'Specific EOI' to master-IRQ2 */
218
219 } else {
220 master_mask |= (1 << (irq&7));
221 eisa_out8(master_mask, 0x21);
222 eisa_out8(0x60|irq,0x20); /* 'Specific EOI' to master */
223 }
224 spin_unlock_irqrestore(&eisa_irq_lock, flags);
225
Kyle McMartinba200852010-10-13 21:00:55 -0400226 generic_handle_irq(irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
228 spin_lock_irqsave(&eisa_irq_lock, flags);
229 /* unmask */
230 if (irq & 8) {
231 slave_mask &= ~(1 << (irq&7));
232 eisa_out8(slave_mask, 0xa1);
233 } else {
234 master_mask &= ~(1 << (irq&7));
235 eisa_out8(master_mask, 0x21);
236 }
237 spin_unlock_irqrestore(&eisa_irq_lock, flags);
238 return IRQ_HANDLED;
239}
240
David Howells7d12e782006-10-05 14:55:46 +0100241static irqreturn_t dummy_irq2_handler(int _, void *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242{
243 printk(KERN_ALERT "eisa: uhh, irq2?\n");
244 return IRQ_HANDLED;
245}
246
247static struct irqaction irq2_action = {
248 .handler = dummy_irq2_handler,
249 .name = "cascade",
250};
251
252static void init_eisa_pic(void)
253{
254 unsigned long flags;
255
256 spin_lock_irqsave(&eisa_irq_lock, flags);
257
258 eisa_out8(0xff, 0x21); /* mask during init */
259 eisa_out8(0xff, 0xa1); /* mask during init */
260
261 /* master pic */
262 eisa_out8(0x11,0x20); /* ICW1 */
263 eisa_out8(0x00,0x21); /* ICW2 */
264 eisa_out8(0x04,0x21); /* ICW3 */
265 eisa_out8(0x01,0x21); /* ICW4 */
266 eisa_out8(0x40,0x20); /* OCW2 */
267
268 /* slave pic */
269 eisa_out8(0x11,0xa0); /* ICW1 */
270 eisa_out8(0x08,0xa1); /* ICW2 */
271 eisa_out8(0x02,0xa1); /* ICW3 */
272 eisa_out8(0x01,0xa1); /* ICW4 */
273 eisa_out8(0x40,0xa0); /* OCW2 */
274
275 udelay(100);
276
277 slave_mask = 0xff;
278 master_mask = 0xfb;
279 eisa_out8(slave_mask, 0xa1); /* OCW1 */
280 eisa_out8(master_mask, 0x21); /* OCW1 */
281
282 /* setup trig level */
283 EISA_DBG("EISA edge/level %04x\n", eisa_irq_level);
284
285 eisa_out8(eisa_irq_level&0xff, 0x4d0); /* Set all irq's to edge */
286 eisa_out8((eisa_irq_level >> 8) & 0xff, 0x4d1);
287
288 EISA_DBG("pic0 mask %02x\n", eisa_in8(0x21));
289 EISA_DBG("pic1 mask %02x\n", eisa_in8(0xa1));
290 EISA_DBG("pic0 edge/level %02x\n", eisa_in8(0x4d0));
291 EISA_DBG("pic1 edge/level %02x\n", eisa_in8(0x4d1));
292
293 spin_unlock_irqrestore(&eisa_irq_lock, flags);
294}
295
296/* Device initialisation */
297
298#define is_mongoose(dev) (dev->id.sversion == 0x00076)
299
Helge Deller6fe077f2007-05-27 19:57:11 +0200300static int __init eisa_probe(struct parisc_device *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301{
302 int i, result;
303
304 char *name = is_mongoose(dev) ? "Mongoose" : "Wax";
305
306 printk(KERN_INFO "%s EISA Adapter found at 0x%08lx\n",
Alexander Beregalovc18b4602009-03-19 10:54:07 +0000307 name, (unsigned long)dev->hpa.start);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
309 eisa_dev.hba.dev = dev;
310 eisa_dev.hba.iommu = ccio_get_iommu(dev);
311
312 eisa_dev.hba.lmmio_space.name = "EISA";
313 eisa_dev.hba.lmmio_space.start = F_EXTEND(0xfc000000);
314 eisa_dev.hba.lmmio_space.end = F_EXTEND(0xffbfffff);
315 eisa_dev.hba.lmmio_space.flags = IORESOURCE_MEM;
316 result = ccio_request_resource(dev, &eisa_dev.hba.lmmio_space);
317 if (result < 0) {
318 printk(KERN_ERR "EISA: failed to claim EISA Bus address space!\n");
319 return result;
320 }
321 eisa_dev.hba.io_space.name = "EISA";
322 eisa_dev.hba.io_space.start = 0;
323 eisa_dev.hba.io_space.end = 0xffff;
324 eisa_dev.hba.lmmio_space.flags = IORESOURCE_IO;
325 result = request_resource(&ioport_resource, &eisa_dev.hba.io_space);
326 if (result < 0) {
327 printk(KERN_ERR "EISA: failed to claim EISA Bus port space!\n");
328 return result;
329 }
330 pcibios_register_hba(&eisa_dev.hba);
331
Thomas Gleixner8c56e722006-07-01 19:29:40 -0700332 result = request_irq(dev->irq, eisa_irq, IRQF_SHARED, "EISA", &eisa_dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 if (result) {
334 printk(KERN_ERR "EISA: request_irq failed!\n");
335 return result;
336 }
337
338 /* Reserve IRQ2 */
Kyle McMartinba200852010-10-13 21:00:55 -0400339 setup_irq(2, &irq2_action);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 for (i = 0; i < 16; i++) {
Kyle McMartinba200852010-10-13 21:00:55 -0400341 set_irq_chip_and_handler(i, &eisa_interrupt_type,
James Bottomley51890612010-12-03 02:01:05 +0000342 handle_simple_irq);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 }
344
345 EISA_bus = 1;
346
347 if (dev->num_addrs) {
348 /* newer firmware hand out the eeprom address */
349 eisa_dev.eeprom_addr = dev->addr[0];
350 } else {
351 /* old firmware, need to figure out the box */
352 if (is_mongoose(dev)) {
353 eisa_dev.eeprom_addr = SNAKES_EEPROM_BASE_ADDR;
354 } else {
355 eisa_dev.eeprom_addr = MIRAGE_EEPROM_BASE_ADDR;
356 }
357 }
Helge Deller5076c152006-03-27 12:52:15 -0700358 eisa_eeprom_addr = ioremap_nocache(eisa_dev.eeprom_addr, HPEE_MAX_LENGTH);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 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;
Greg Kroah-Hartmand18dbfa2009-05-04 12:40:54 -0700366 dev_set_drvdata(&dev->dev, &eisa_dev.root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 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 return -1;
374 }
375 }
376
377 return 0;
378}
379
Helge Deller6fe077f2007-05-27 19:57:11 +0200380static const struct parisc_device_id eisa_tbl[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00076 }, /* Mongoose */
382 { HPHW_BA, HVERSION_REV_ANY_ID, HVERSION_ANY_ID, 0x00090 }, /* Wax EISA */
383 { 0, }
384};
385
386MODULE_DEVICE_TABLE(parisc, eisa_tbl);
387
388static struct parisc_driver eisa_driver = {
Matthew Wilcoxbdad1f82005-10-21 22:36:23 -0400389 .name = "eisa_ba",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700390 .id_table = eisa_tbl,
391 .probe = eisa_probe,
392};
393
394void __init eisa_init(void)
395{
396 register_parisc_driver(&eisa_driver);
397}
398
399
400static unsigned int eisa_irq_configured;
401void eisa_make_irq_level(int num)
402{
403 if (eisa_irq_configured& (1<<num)) {
404 printk(KERN_WARNING
405 "IRQ %d polarity configured twice (last to level)\n",
406 num);
407 }
408 eisa_irq_level |= (1<<num); /* set the corresponding bit */
409 eisa_irq_configured |= (1<<num); /* set the corresponding bit */
410}
411
412void eisa_make_irq_edge(int num)
413{
414 if (eisa_irq_configured& (1<<num)) {
415 printk(KERN_WARNING
416 "IRQ %d polarity configured twice (last to edge)\n",
417 num);
418 }
419 eisa_irq_level &= ~(1<<num); /* clear the corresponding bit */
420 eisa_irq_configured |= (1<<num); /* set the corresponding bit */
421}
422
423static int __init eisa_irq_setup(char *str)
424{
425 char *cur = str;
426 int val;
427
428 EISA_DBG("IRQ setup\n");
429 while (cur != NULL) {
430 char *pe;
431
432 val = (int) simple_strtoul(cur, &pe, 0);
433 if (val > 15 || val < 0) {
434 printk(KERN_ERR "eisa: EISA irq value are 0-15\n");
435 continue;
436 }
437 if (val == 2) {
438 val = 9;
439 }
440 eisa_make_irq_edge(val); /* clear the corresponding bit */
441 EISA_DBG("setting IRQ %d to edge-triggered mode\n", val);
442
443 if ((cur = strchr(cur, ','))) {
444 cur++;
445 } else {
446 break;
447 }
448 }
449 return 1;
450}
451
452__setup("eisa_irq_edge=", eisa_irq_setup);
453