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1/*
2 * linux/arch/alpha/kernel/sys_sio.c
3 *
4 * Copyright (C) 1995 David A Rusling
5 * Copyright (C) 1996 Jay A Estabrook
6 * Copyright (C) 1998, 1999 Richard Henderson
7 *
8 * Code for all boards that route the PCI interrupts through the SIO
9 * PCI/ISA bridge. This includes Noname (AXPpci33), Multia (UDB),
10 * Kenetics's Platform 2000, Avanti (AlphaStation), XL, and AlphaBook1.
11 */
12
13#include <linux/kernel.h>
14#include <linux/types.h>
15#include <linux/mm.h>
16#include <linux/sched.h>
17#include <linux/pci.h>
18#include <linux/init.h>
19#include <linux/screen_info.h>
20
21#include <asm/compiler.h>
22#include <asm/ptrace.h>
23#include <asm/dma.h>
24#include <asm/irq.h>
25#include <asm/mmu_context.h>
26#include <asm/io.h>
27#include <asm/pgtable.h>
28#include <asm/core_apecs.h>
29#include <asm/core_lca.h>
30#include <asm/tlbflush.h>
31
32#include "proto.h"
33#include "irq_impl.h"
34#include "pci_impl.h"
35#include "machvec_impl.h"
36#include "pc873xx.h"
37
38#if defined(ALPHA_RESTORE_SRM_SETUP)
39/* Save LCA configuration data as the console had it set up. */
40struct
41{
42 unsigned int orig_route_tab; /* for SAVE/RESTORE */
43} saved_config __attribute((common));
44#endif
45
46
47static void __init
48sio_init_irq(void)
49{
50 if (alpha_using_srm)
51 alpha_mv.device_interrupt = srm_device_interrupt;
52
53 init_i8259a_irqs();
54 common_init_isa_dma();
55}
56
57static inline void __init
58alphabook1_init_arch(void)
59{
60 /* The AlphaBook1 has LCD video fixed at 800x600,
61 37 rows and 100 cols. */
62 screen_info.orig_y = 37;
63 screen_info.orig_video_cols = 100;
64 screen_info.orig_video_lines = 37;
65
66 lca_init_arch();
67}
68
69
70/*
71 * sio_route_tab selects irq routing in PCI/ISA bridge so that:
72 * PIRQ0 -> irq 15
73 * PIRQ1 -> irq 9
74 * PIRQ2 -> irq 10
75 * PIRQ3 -> irq 11
76 *
77 * This probably ought to be configurable via MILO. For
78 * example, sound boards seem to like using IRQ 9.
79 *
80 * This is NOT how we should do it. PIRQ0-X should have
81 * their own IRQs, the way intel uses the IO-APIC IRQs.
82 */
83
84static void __init
85sio_pci_route(void)
86{
87 unsigned int orig_route_tab;
88
89 /* First, ALWAYS read and print the original setting. */
90 pci_bus_read_config_dword(pci_isa_hose->bus, PCI_DEVFN(7, 0), 0x60,
91 &orig_route_tab);
92 printk("%s: PIRQ original 0x%x new 0x%x\n", __func__,
93 orig_route_tab, alpha_mv.sys.sio.route_tab);
94
95#if defined(ALPHA_RESTORE_SRM_SETUP)
96 saved_config.orig_route_tab = orig_route_tab;
97#endif
98
99 /* Now override with desired setting. */
100 pci_bus_write_config_dword(pci_isa_hose->bus, PCI_DEVFN(7, 0), 0x60,
101 alpha_mv.sys.sio.route_tab);
102}
103
104static unsigned int __init
105sio_collect_irq_levels(void)
106{
107 unsigned int level_bits = 0;
108 struct pci_dev *dev = NULL;
109
110 /* Iterate through the devices, collecting IRQ levels. */
111 for_each_pci_dev(dev) {
112 if ((dev->class >> 16 == PCI_BASE_CLASS_BRIDGE) &&
113 (dev->class >> 8 != PCI_CLASS_BRIDGE_PCMCIA))
114 continue;
115
116 if (dev->irq)
117 level_bits |= (1 << dev->irq);
118 }
119 return level_bits;
120}
121
122static void __init
123sio_fixup_irq_levels(unsigned int level_bits)
124{
125 unsigned int old_level_bits;
126
127 /*
128 * Now, make all PCI interrupts level sensitive. Notice:
129 * these registers must be accessed byte-wise. inw()/outw()
130 * don't work.
131 *
132 * Make sure to turn off any level bits set for IRQs 9,10,11,15,
133 * so that the only bits getting set are for devices actually found.
134 * Note that we do preserve the remainder of the bits, which we hope
135 * will be set correctly by ARC/SRM.
136 *
137 * Note: we at least preserve any level-set bits on AlphaBook1
138 */
139 old_level_bits = inb(0x4d0) | (inb(0x4d1) << 8);
140
141 level_bits |= (old_level_bits & 0x71ff);
142
143 outb((level_bits >> 0) & 0xff, 0x4d0);
144 outb((level_bits >> 8) & 0xff, 0x4d1);
145}
146
147static inline int __init
148noname_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
149{
150 /*
151 * The Noname board has 5 PCI slots with each of the 4
152 * interrupt pins routed to different pins on the PCI/ISA
153 * bridge (PIRQ0-PIRQ3). The table below is based on
154 * information available at:
155 *
156 * http://ftp.digital.com/pub/DEC/axppci/ref_interrupts.txt
157 *
158 * I have no information on the Avanti interrupt routing, but
159 * the routing seems to be identical to the Noname except
160 * that the Avanti has an additional slot whose routing I'm
161 * unsure of.
162 *
163 * pirq_tab[0] is a fake entry to deal with old PCI boards
164 * that have the interrupt pin number hardwired to 0 (meaning
165 * that they use the default INTA line, if they are interrupt
166 * driven at all).
167 */
168 static char irq_tab[][5] __initdata = {
169 /*INT A B C D */
170 { 3, 3, 3, 3, 3}, /* idsel 6 (53c810) */
171 {-1, -1, -1, -1, -1}, /* idsel 7 (SIO: PCI/ISA bridge) */
172 { 2, 2, -1, -1, -1}, /* idsel 8 (Hack: slot closest ISA) */
173 {-1, -1, -1, -1, -1}, /* idsel 9 (unused) */
174 {-1, -1, -1, -1, -1}, /* idsel 10 (unused) */
175 { 0, 0, 2, 1, 0}, /* idsel 11 KN25_PCI_SLOT0 */
176 { 1, 1, 0, 2, 1}, /* idsel 12 KN25_PCI_SLOT1 */
177 { 2, 2, 1, 0, 2}, /* idsel 13 KN25_PCI_SLOT2 */
178 { 0, 0, 0, 0, 0}, /* idsel 14 AS255 TULIP */
179 };
180 const long min_idsel = 6, max_idsel = 14, irqs_per_slot = 5;
181 int irq = COMMON_TABLE_LOOKUP, tmp;
182 tmp = __kernel_extbl(alpha_mv.sys.sio.route_tab, irq);
183 return irq >= 0 ? tmp : -1;
184}
185
186static inline int __init
187p2k_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
188{
189 static char irq_tab[][5] __initdata = {
190 /*INT A B C D */
191 { 0, 0, -1, -1, -1}, /* idsel 6 (53c810) */
192 {-1, -1, -1, -1, -1}, /* idsel 7 (SIO: PCI/ISA bridge) */
193 { 1, 1, 2, 3, 0}, /* idsel 8 (slot A) */
194 { 2, 2, 3, 0, 1}, /* idsel 9 (slot B) */
195 {-1, -1, -1, -1, -1}, /* idsel 10 (unused) */
196 {-1, -1, -1, -1, -1}, /* idsel 11 (unused) */
197 { 3, 3, -1, -1, -1}, /* idsel 12 (CMD0646) */
198 };
199 const long min_idsel = 6, max_idsel = 12, irqs_per_slot = 5;
200 int irq = COMMON_TABLE_LOOKUP, tmp;
201 tmp = __kernel_extbl(alpha_mv.sys.sio.route_tab, irq);
202 return irq >= 0 ? tmp : -1;
203}
204
205static inline void __init
206noname_init_pci(void)
207{
208 common_init_pci();
209 sio_pci_route();
210 sio_fixup_irq_levels(sio_collect_irq_levels());
211
212 if (pc873xx_probe() == -1) {
213 printk(KERN_ERR "Probing for PC873xx Super IO chip failed.\n");
214 } else {
215 printk(KERN_INFO "Found %s Super IO chip at 0x%x\n",
216 pc873xx_get_model(), pc873xx_get_base());
217
218 /* Enabling things in the Super IO chip doesn't actually
219 * configure and enable things, the legacy drivers still
220 * need to do the actual configuration and enabling.
221 * This only unblocks them.
222 */
223
224#if !defined(CONFIG_ALPHA_AVANTI)
225 /* Don't bother on the Avanti family.
226 * None of them had on-board IDE.
227 */
228 pc873xx_enable_ide();
229#endif
230 pc873xx_enable_epp19();
231 }
232}
233
234static inline void __init
235alphabook1_init_pci(void)
236{
237 struct pci_dev *dev;
238 unsigned char orig, config;
239
240 common_init_pci();
241 sio_pci_route();
242
243 /*
244 * On the AlphaBook1, the PCMCIA chip (Cirrus 6729)
245 * is sensitive to PCI bus bursts, so we must DISABLE
246 * burst mode for the NCR 8xx SCSI... :-(
247 *
248 * Note that the NCR810 SCSI driver must preserve the
249 * setting of the bit in order for this to work. At the
250 * moment (2.0.29), ncr53c8xx.c does NOT do this, but
251 * 53c7,8xx.c DOES.
252 */
253
254 dev = NULL;
255 while ((dev = pci_get_device(PCI_VENDOR_ID_NCR, PCI_ANY_ID, dev))) {
256 if (dev->device == PCI_DEVICE_ID_NCR_53C810
257 || dev->device == PCI_DEVICE_ID_NCR_53C815
258 || dev->device == PCI_DEVICE_ID_NCR_53C820
259 || dev->device == PCI_DEVICE_ID_NCR_53C825) {
260 unsigned long io_port;
261 unsigned char ctest4;
262
263 io_port = dev->resource[0].start;
264 ctest4 = inb(io_port+0x21);
265 if (!(ctest4 & 0x80)) {
266 printk("AlphaBook1 NCR init: setting"
267 " burst disable\n");
268 outb(ctest4 | 0x80, io_port+0x21);
269 }
270 }
271 }
272
273 /* Do not set *ANY* level triggers for AlphaBook1. */
274 sio_fixup_irq_levels(0);
275
276 /* Make sure that register PR1 indicates 1Mb mem */
277 outb(0x0f, 0x3ce); orig = inb(0x3cf); /* read PR5 */
278 outb(0x0f, 0x3ce); outb(0x05, 0x3cf); /* unlock PR0-4 */
279 outb(0x0b, 0x3ce); config = inb(0x3cf); /* read PR1 */
280 if ((config & 0xc0) != 0xc0) {
281 printk("AlphaBook1 VGA init: setting 1Mb memory\n");
282 config |= 0xc0;
283 outb(0x0b, 0x3ce); outb(config, 0x3cf); /* write PR1 */
284 }
285 outb(0x0f, 0x3ce); outb(orig, 0x3cf); /* (re)lock PR0-4 */
286}
287
288void
289sio_kill_arch(int mode)
290{
291#if defined(ALPHA_RESTORE_SRM_SETUP)
292 /* Since we cannot read the PCI DMA Window CSRs, we
293 * cannot restore them here.
294 *
295 * However, we CAN read the PIRQ route register, so restore it
296 * now...
297 */
298 pci_bus_write_config_dword(pci_isa_hose->bus, PCI_DEVFN(7, 0), 0x60,
299 saved_config.orig_route_tab);
300#endif
301}
302
303
304/*
305 * The System Vectors
306 */
307
308#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_BOOK1)
309struct alpha_machine_vector alphabook1_mv __initmv = {
310 .vector_name = "AlphaBook1",
311 DO_EV4_MMU,
312 DO_DEFAULT_RTC,
313 DO_LCA_IO,
314 .machine_check = lca_machine_check,
315 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
316 .min_io_address = DEFAULT_IO_BASE,
317 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
318
319 .nr_irqs = 16,
320 .device_interrupt = isa_device_interrupt,
321
322 .init_arch = alphabook1_init_arch,
323 .init_irq = sio_init_irq,
324 .init_rtc = common_init_rtc,
325 .init_pci = alphabook1_init_pci,
326 .kill_arch = sio_kill_arch,
327 .pci_map_irq = noname_map_irq,
328 .pci_swizzle = common_swizzle,
329
330 .sys = { .sio = {
331 /* NCR810 SCSI is 14, PCMCIA controller is 15. */
332 .route_tab = 0x0e0f0a0a,
333 }}
334};
335ALIAS_MV(alphabook1)
336#endif
337
338#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_AVANTI)
339struct alpha_machine_vector avanti_mv __initmv = {
340 .vector_name = "Avanti",
341 DO_EV4_MMU,
342 DO_DEFAULT_RTC,
343 DO_APECS_IO,
344 .machine_check = apecs_machine_check,
345 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
346 .min_io_address = DEFAULT_IO_BASE,
347 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
348
349 .nr_irqs = 16,
350 .device_interrupt = isa_device_interrupt,
351
352 .init_arch = apecs_init_arch,
353 .init_irq = sio_init_irq,
354 .init_rtc = common_init_rtc,
355 .init_pci = noname_init_pci,
356 .kill_arch = sio_kill_arch,
357 .pci_map_irq = noname_map_irq,
358 .pci_swizzle = common_swizzle,
359
360 .sys = { .sio = {
361 .route_tab = 0x0b0a050f, /* leave 14 for IDE, 9 for SND */
362 }}
363};
364ALIAS_MV(avanti)
365#endif
366
367#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_NONAME)
368struct alpha_machine_vector noname_mv __initmv = {
369 .vector_name = "Noname",
370 DO_EV4_MMU,
371 DO_DEFAULT_RTC,
372 DO_LCA_IO,
373 .machine_check = lca_machine_check,
374 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
375 .min_io_address = DEFAULT_IO_BASE,
376 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
377
378 .nr_irqs = 16,
379 .device_interrupt = srm_device_interrupt,
380
381 .init_arch = lca_init_arch,
382 .init_irq = sio_init_irq,
383 .init_rtc = common_init_rtc,
384 .init_pci = noname_init_pci,
385 .kill_arch = sio_kill_arch,
386 .pci_map_irq = noname_map_irq,
387 .pci_swizzle = common_swizzle,
388
389 .sys = { .sio = {
390 /* For UDB, the only available PCI slot must not map to IRQ 9,
391 since that's the builtin MSS sound chip. That PCI slot
392 will map to PIRQ1 (for INTA at least), so we give it IRQ 15
393 instead.
394
395 Unfortunately we have to do this for NONAME as well, since
396 they are co-indicated when the platform type "Noname" is
397 selected... :-( */
398
399 .route_tab = 0x0b0a0f0d,
400 }}
401};
402ALIAS_MV(noname)
403#endif
404
405#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_P2K)
406struct alpha_machine_vector p2k_mv __initmv = {
407 .vector_name = "Platform2000",
408 DO_EV4_MMU,
409 DO_DEFAULT_RTC,
410 DO_LCA_IO,
411 .machine_check = lca_machine_check,
412 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
413 .min_io_address = DEFAULT_IO_BASE,
414 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
415
416 .nr_irqs = 16,
417 .device_interrupt = srm_device_interrupt,
418
419 .init_arch = lca_init_arch,
420 .init_irq = sio_init_irq,
421 .init_rtc = common_init_rtc,
422 .init_pci = noname_init_pci,
423 .kill_arch = sio_kill_arch,
424 .pci_map_irq = p2k_map_irq,
425 .pci_swizzle = common_swizzle,
426
427 .sys = { .sio = {
428 .route_tab = 0x0b0a090f,
429 }}
430};
431ALIAS_MV(p2k)
432#endif
433
434#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_XL)
435struct alpha_machine_vector xl_mv __initmv = {
436 .vector_name = "XL",
437 DO_EV4_MMU,
438 DO_DEFAULT_RTC,
439 DO_APECS_IO,
440 .machine_check = apecs_machine_check,
441 .max_isa_dma_address = ALPHA_XL_MAX_ISA_DMA_ADDRESS,
442 .min_io_address = DEFAULT_IO_BASE,
443 .min_mem_address = XL_DEFAULT_MEM_BASE,
444
445 .nr_irqs = 16,
446 .device_interrupt = isa_device_interrupt,
447
448 .init_arch = apecs_init_arch,
449 .init_irq = sio_init_irq,
450 .init_rtc = common_init_rtc,
451 .init_pci = noname_init_pci,
452 .kill_arch = sio_kill_arch,
453 .pci_map_irq = noname_map_irq,
454 .pci_swizzle = common_swizzle,
455
456 .sys = { .sio = {
457 .route_tab = 0x0b0a090f,
458 }}
459};
460ALIAS_MV(xl)
461#endif