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1da177e4 LT |
1 | /* |
2 | * linux/arch/alpha/kernel/sys_cabriolet.c | |
3 | * | |
4 | * Copyright (C) 1995 David A Rusling | |
5 | * Copyright (C) 1996 Jay A Estabrook | |
6 | * Copyright (C) 1998, 1999, 2000 Richard Henderson | |
7 | * | |
8 | * Code supporting the Cabriolet (AlphaPC64), EB66+, and EB164, | |
9 | * PC164 and LX164. | |
10 | */ | |
11 | ||
1da177e4 LT |
12 | #include <linux/kernel.h> |
13 | #include <linux/types.h> | |
14 | #include <linux/mm.h> | |
15 | #include <linux/sched.h> | |
16 | #include <linux/pci.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/bitops.h> | |
19 | ||
20 | #include <asm/ptrace.h> | |
21 | #include <asm/system.h> | |
22 | #include <asm/dma.h> | |
23 | #include <asm/irq.h> | |
24 | #include <asm/mmu_context.h> | |
25 | #include <asm/io.h> | |
26 | #include <asm/pgtable.h> | |
27 | #include <asm/core_apecs.h> | |
28 | #include <asm/core_cia.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" | |
59b25ed9 | 36 | #include "pc873xx.h" |
1da177e4 LT |
37 | |
38 | /* Note mask bit is true for DISABLED irqs. */ | |
39 | static unsigned long cached_irq_mask = ~0UL; | |
40 | ||
41 | static inline void | |
42 | cabriolet_update_irq_hw(unsigned int irq, unsigned long mask) | |
43 | { | |
44 | int ofs = (irq - 16) / 8; | |
45 | outb(mask >> (16 + ofs * 8), 0x804 + ofs); | |
46 | } | |
47 | ||
48 | static inline void | |
49 | cabriolet_enable_irq(unsigned int irq) | |
50 | { | |
51 | cabriolet_update_irq_hw(irq, cached_irq_mask &= ~(1UL << irq)); | |
52 | } | |
53 | ||
54 | static void | |
55 | cabriolet_disable_irq(unsigned int irq) | |
56 | { | |
57 | cabriolet_update_irq_hw(irq, cached_irq_mask |= 1UL << irq); | |
58 | } | |
59 | ||
60 | static unsigned int | |
61 | cabriolet_startup_irq(unsigned int irq) | |
62 | { | |
63 | cabriolet_enable_irq(irq); | |
64 | return 0; /* never anything pending */ | |
65 | } | |
66 | ||
67 | static void | |
68 | cabriolet_end_irq(unsigned int irq) | |
69 | { | |
70 | if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS))) | |
71 | cabriolet_enable_irq(irq); | |
72 | } | |
73 | ||
44377f62 | 74 | static struct irq_chip cabriolet_irq_type = { |
8ab1221c | 75 | .name = "CABRIOLET", |
1da177e4 LT |
76 | .startup = cabriolet_startup_irq, |
77 | .shutdown = cabriolet_disable_irq, | |
78 | .enable = cabriolet_enable_irq, | |
79 | .disable = cabriolet_disable_irq, | |
80 | .ack = cabriolet_disable_irq, | |
81 | .end = cabriolet_end_irq, | |
82 | }; | |
83 | ||
84 | static void | |
7ca56053 | 85 | cabriolet_device_interrupt(unsigned long v) |
1da177e4 LT |
86 | { |
87 | unsigned long pld; | |
88 | unsigned int i; | |
89 | ||
90 | /* Read the interrupt summary registers */ | |
91 | pld = inb(0x804) | (inb(0x805) << 8) | (inb(0x806) << 16); | |
92 | ||
93 | /* | |
94 | * Now for every possible bit set, work through them and call | |
95 | * the appropriate interrupt handler. | |
96 | */ | |
97 | while (pld) { | |
98 | i = ffz(~pld); | |
99 | pld &= pld - 1; /* clear least bit set */ | |
100 | if (i == 4) { | |
7ca56053 | 101 | isa_device_interrupt(v); |
1da177e4 | 102 | } else { |
3dbb8c62 | 103 | handle_irq(16 + i); |
1da177e4 LT |
104 | } |
105 | } | |
106 | } | |
107 | ||
108 | static void __init | |
7ca56053 | 109 | common_init_irq(void (*srm_dev_int)(unsigned long v)) |
1da177e4 LT |
110 | { |
111 | init_i8259a_irqs(); | |
112 | ||
113 | if (alpha_using_srm) { | |
114 | alpha_mv.device_interrupt = srm_dev_int; | |
115 | init_srm_irqs(35, 0); | |
116 | } | |
117 | else { | |
118 | long i; | |
119 | ||
120 | outb(0xff, 0x804); | |
121 | outb(0xff, 0x805); | |
122 | outb(0xff, 0x806); | |
123 | ||
124 | for (i = 16; i < 35; ++i) { | |
125 | irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL; | |
d1bef4ed | 126 | irq_desc[i].chip = &cabriolet_irq_type; |
1da177e4 LT |
127 | } |
128 | } | |
129 | ||
130 | common_init_isa_dma(); | |
131 | setup_irq(16+4, &isa_cascade_irqaction); | |
132 | } | |
133 | ||
134 | #ifndef CONFIG_ALPHA_PC164 | |
135 | static void __init | |
136 | cabriolet_init_irq(void) | |
137 | { | |
138 | common_init_irq(srm_device_interrupt); | |
139 | } | |
140 | #endif | |
141 | ||
142 | #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PC164) | |
143 | /* In theory, the PC164 has the same interrupt hardware as the other | |
144 | Cabriolet based systems. However, something got screwed up late | |
145 | in the development cycle which broke the interrupt masking hardware. | |
146 | Repeat, it is not possible to mask and ack interrupts. At all. | |
147 | ||
148 | In an attempt to work around this, while processing interrupts, | |
149 | we do not allow the IPL to drop below what it is currently. This | |
150 | prevents the possibility of recursion. | |
151 | ||
152 | ??? Another option might be to force all PCI devices to use edge | |
153 | triggered rather than level triggered interrupts. That might be | |
154 | too invasive though. */ | |
155 | ||
156 | static void | |
7ca56053 | 157 | pc164_srm_device_interrupt(unsigned long v) |
1da177e4 LT |
158 | { |
159 | __min_ipl = getipl(); | |
7ca56053 | 160 | srm_device_interrupt(v); |
1da177e4 LT |
161 | __min_ipl = 0; |
162 | } | |
163 | ||
164 | static void | |
7ca56053 | 165 | pc164_device_interrupt(unsigned long v) |
1da177e4 LT |
166 | { |
167 | __min_ipl = getipl(); | |
7ca56053 | 168 | cabriolet_device_interrupt(v); |
1da177e4 LT |
169 | __min_ipl = 0; |
170 | } | |
171 | ||
172 | static void __init | |
173 | pc164_init_irq(void) | |
174 | { | |
175 | common_init_irq(pc164_srm_device_interrupt); | |
176 | } | |
177 | #endif | |
178 | ||
179 | /* | |
180 | * The EB66+ is very similar to the EB66 except that it does not have | |
181 | * the on-board NCR and Tulip chips. In the code below, I have used | |
182 | * slot number to refer to the id select line and *not* the slot | |
183 | * number used in the EB66+ documentation. However, in the table, | |
184 | * I've given the slot number, the id select line and the Jxx number | |
185 | * that's printed on the board. The interrupt pins from the PCI slots | |
186 | * are wired into 3 interrupt summary registers at 0x804, 0x805 and | |
187 | * 0x806 ISA. | |
188 | * | |
189 | * In the table, -1 means don't assign an IRQ number. This is usually | |
190 | * because it is the Saturn IO (SIO) PCI/ISA Bridge Chip. | |
191 | */ | |
192 | ||
193 | static inline int __init | |
194 | eb66p_map_irq(struct pci_dev *dev, u8 slot, u8 pin) | |
195 | { | |
196 | static char irq_tab[5][5] __initdata = { | |
197 | /*INT INTA INTB INTC INTD */ | |
198 | {16+0, 16+0, 16+5, 16+9, 16+13}, /* IdSel 6, slot 0, J25 */ | |
199 | {16+1, 16+1, 16+6, 16+10, 16+14}, /* IdSel 7, slot 1, J26 */ | |
200 | { -1, -1, -1, -1, -1}, /* IdSel 8, SIO */ | |
201 | {16+2, 16+2, 16+7, 16+11, 16+15}, /* IdSel 9, slot 2, J27 */ | |
202 | {16+3, 16+3, 16+8, 16+12, 16+6} /* IdSel 10, slot 3, J28 */ | |
203 | }; | |
204 | const long min_idsel = 6, max_idsel = 10, irqs_per_slot = 5; | |
205 | return COMMON_TABLE_LOOKUP; | |
206 | } | |
207 | ||
208 | ||
209 | /* | |
210 | * The AlphaPC64 is very similar to the EB66+ except that its slots | |
211 | * are numbered differently. In the code below, I have used slot | |
212 | * number to refer to the id select line and *not* the slot number | |
213 | * used in the AlphaPC64 documentation. However, in the table, I've | |
214 | * given the slot number, the id select line and the Jxx number that's | |
215 | * printed on the board. The interrupt pins from the PCI slots are | |
216 | * wired into 3 interrupt summary registers at 0x804, 0x805 and 0x806 | |
217 | * ISA. | |
218 | * | |
219 | * In the table, -1 means don't assign an IRQ number. This is usually | |
220 | * because it is the Saturn IO (SIO) PCI/ISA Bridge Chip. | |
221 | */ | |
222 | ||
223 | static inline int __init | |
224 | cabriolet_map_irq(struct pci_dev *dev, u8 slot, u8 pin) | |
225 | { | |
226 | static char irq_tab[5][5] __initdata = { | |
227 | /*INT INTA INTB INTC INTD */ | |
228 | { 16+2, 16+2, 16+7, 16+11, 16+15}, /* IdSel 5, slot 2, J21 */ | |
229 | { 16+0, 16+0, 16+5, 16+9, 16+13}, /* IdSel 6, slot 0, J19 */ | |
230 | { 16+1, 16+1, 16+6, 16+10, 16+14}, /* IdSel 7, slot 1, J20 */ | |
231 | { -1, -1, -1, -1, -1}, /* IdSel 8, SIO */ | |
232 | { 16+3, 16+3, 16+8, 16+12, 16+16} /* IdSel 9, slot 3, J22 */ | |
233 | }; | |
234 | const long min_idsel = 5, max_idsel = 9, irqs_per_slot = 5; | |
235 | return COMMON_TABLE_LOOKUP; | |
236 | } | |
237 | ||
59b25ed9 ML |
238 | static inline void __init |
239 | cabriolet_enable_ide(void) | |
240 | { | |
241 | if (pc873xx_probe() == -1) { | |
242 | printk(KERN_ERR "Probing for PC873xx Super IO chip failed.\n"); | |
243 | } else { | |
244 | printk(KERN_INFO "Found %s Super IO chip at 0x%x\n", | |
245 | pc873xx_get_model(), pc873xx_get_base()); | |
246 | ||
247 | pc873xx_enable_ide(); | |
248 | } | |
249 | } | |
250 | ||
1da177e4 LT |
251 | static inline void __init |
252 | cabriolet_init_pci(void) | |
253 | { | |
254 | common_init_pci(); | |
59b25ed9 | 255 | cabriolet_enable_ide(); |
1da177e4 LT |
256 | } |
257 | ||
258 | static inline void __init | |
259 | cia_cab_init_pci(void) | |
260 | { | |
261 | cia_init_pci(); | |
59b25ed9 | 262 | cabriolet_enable_ide(); |
1da177e4 LT |
263 | } |
264 | ||
265 | /* | |
266 | * The PC164 and LX164 have 19 PCI interrupts, four from each of the four | |
267 | * PCI slots, the SIO, PCI/IDE, and USB. | |
268 | * | |
269 | * Each of the interrupts can be individually masked. This is | |
270 | * accomplished by setting the appropriate bit in the mask register. | |
271 | * A bit is set by writing a "1" to the desired position in the mask | |
272 | * register and cleared by writing a "0". There are 3 mask registers | |
273 | * located at ISA address 804h, 805h and 806h. | |
274 | * | |
275 | * An I/O read at ISA address 804h, 805h, 806h will return the | |
276 | * state of the 11 PCI interrupts and not the state of the MASKED | |
277 | * interrupts. | |
278 | * | |
279 | * Note: A write to I/O 804h, 805h, and 806h the mask register will be | |
280 | * updated. | |
281 | * | |
282 | * | |
283 | * ISA DATA<7:0> | |
284 | * ISA +--------------------------------------------------------------+ | |
285 | * ADDRESS | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 | | |
286 | * +==============================================================+ | |
287 | * 0x804 | INTB0 | USB | IDE | SIO | INTA3 |INTA2 | INTA1 | INTA0 | | |
288 | * +--------------------------------------------------------------+ | |
289 | * 0x805 | INTD0 | INTC3 | INTC2 | INTC1 | INTC0 |INTB3 | INTB2 | INTB1 | | |
290 | * +--------------------------------------------------------------+ | |
291 | * 0x806 | Rsrv | Rsrv | Rsrv | Rsrv | Rsrv |INTD3 | INTD2 | INTD1 | | |
292 | * +--------------------------------------------------------------+ | |
293 | * * Rsrv = reserved bits | |
294 | * Note: The mask register is write-only. | |
295 | * | |
296 | * IdSel | |
297 | * 5 32 bit PCI option slot 2 | |
298 | * 6 64 bit PCI option slot 0 | |
299 | * 7 64 bit PCI option slot 1 | |
300 | * 8 Saturn I/O | |
301 | * 9 32 bit PCI option slot 3 | |
302 | * 10 USB | |
303 | * 11 IDE | |
304 | * | |
305 | */ | |
306 | ||
307 | static inline int __init | |
308 | alphapc164_map_irq(struct pci_dev *dev, u8 slot, u8 pin) | |
309 | { | |
310 | static char irq_tab[7][5] __initdata = { | |
311 | /*INT INTA INTB INTC INTD */ | |
312 | { 16+2, 16+2, 16+9, 16+13, 16+17}, /* IdSel 5, slot 2, J20 */ | |
313 | { 16+0, 16+0, 16+7, 16+11, 16+15}, /* IdSel 6, slot 0, J29 */ | |
314 | { 16+1, 16+1, 16+8, 16+12, 16+16}, /* IdSel 7, slot 1, J26 */ | |
315 | { -1, -1, -1, -1, -1}, /* IdSel 8, SIO */ | |
316 | { 16+3, 16+3, 16+10, 16+14, 16+18}, /* IdSel 9, slot 3, J19 */ | |
317 | { 16+6, 16+6, 16+6, 16+6, 16+6}, /* IdSel 10, USB */ | |
318 | { 16+5, 16+5, 16+5, 16+5, 16+5} /* IdSel 11, IDE */ | |
319 | }; | |
320 | const long min_idsel = 5, max_idsel = 11, irqs_per_slot = 5; | |
321 | return COMMON_TABLE_LOOKUP; | |
322 | } | |
323 | ||
324 | static inline void __init | |
325 | alphapc164_init_pci(void) | |
326 | { | |
327 | cia_init_pci(); | |
328 | SMC93x_Init(); | |
329 | } | |
330 | ||
331 | ||
332 | /* | |
333 | * The System Vector | |
334 | */ | |
335 | ||
336 | #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_CABRIOLET) | |
337 | struct alpha_machine_vector cabriolet_mv __initmv = { | |
338 | .vector_name = "Cabriolet", | |
339 | DO_EV4_MMU, | |
340 | DO_DEFAULT_RTC, | |
341 | DO_APECS_IO, | |
342 | .machine_check = apecs_machine_check, | |
343 | .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, | |
344 | .min_io_address = DEFAULT_IO_BASE, | |
345 | .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE, | |
346 | ||
347 | .nr_irqs = 35, | |
348 | .device_interrupt = cabriolet_device_interrupt, | |
349 | ||
350 | .init_arch = apecs_init_arch, | |
351 | .init_irq = cabriolet_init_irq, | |
352 | .init_rtc = common_init_rtc, | |
353 | .init_pci = cabriolet_init_pci, | |
354 | .pci_map_irq = cabriolet_map_irq, | |
355 | .pci_swizzle = common_swizzle, | |
356 | }; | |
357 | #ifndef CONFIG_ALPHA_EB64P | |
358 | ALIAS_MV(cabriolet) | |
359 | #endif | |
360 | #endif | |
361 | ||
362 | #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB164) | |
363 | struct alpha_machine_vector eb164_mv __initmv = { | |
364 | .vector_name = "EB164", | |
365 | DO_EV5_MMU, | |
366 | DO_DEFAULT_RTC, | |
367 | DO_CIA_IO, | |
368 | .machine_check = cia_machine_check, | |
369 | .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, | |
370 | .min_io_address = DEFAULT_IO_BASE, | |
371 | .min_mem_address = CIA_DEFAULT_MEM_BASE, | |
372 | ||
373 | .nr_irqs = 35, | |
374 | .device_interrupt = cabriolet_device_interrupt, | |
375 | ||
376 | .init_arch = cia_init_arch, | |
377 | .init_irq = cabriolet_init_irq, | |
378 | .init_rtc = common_init_rtc, | |
379 | .init_pci = cia_cab_init_pci, | |
380 | .kill_arch = cia_kill_arch, | |
381 | .pci_map_irq = cabriolet_map_irq, | |
382 | .pci_swizzle = common_swizzle, | |
383 | }; | |
384 | ALIAS_MV(eb164) | |
385 | #endif | |
386 | ||
387 | #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB66P) | |
388 | struct alpha_machine_vector eb66p_mv __initmv = { | |
389 | .vector_name = "EB66+", | |
390 | DO_EV4_MMU, | |
391 | DO_DEFAULT_RTC, | |
392 | DO_LCA_IO, | |
393 | .machine_check = lca_machine_check, | |
394 | .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, | |
395 | .min_io_address = DEFAULT_IO_BASE, | |
396 | .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE, | |
397 | ||
398 | .nr_irqs = 35, | |
399 | .device_interrupt = cabriolet_device_interrupt, | |
400 | ||
401 | .init_arch = lca_init_arch, | |
402 | .init_irq = cabriolet_init_irq, | |
403 | .init_rtc = common_init_rtc, | |
404 | .init_pci = cabriolet_init_pci, | |
405 | .pci_map_irq = eb66p_map_irq, | |
406 | .pci_swizzle = common_swizzle, | |
407 | }; | |
408 | ALIAS_MV(eb66p) | |
409 | #endif | |
410 | ||
411 | #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_LX164) | |
412 | struct alpha_machine_vector lx164_mv __initmv = { | |
413 | .vector_name = "LX164", | |
414 | DO_EV5_MMU, | |
415 | DO_DEFAULT_RTC, | |
416 | DO_PYXIS_IO, | |
417 | .machine_check = cia_machine_check, | |
418 | .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, | |
419 | .min_io_address = DEFAULT_IO_BASE, | |
420 | .min_mem_address = DEFAULT_MEM_BASE, | |
421 | .pci_dac_offset = PYXIS_DAC_OFFSET, | |
422 | ||
423 | .nr_irqs = 35, | |
424 | .device_interrupt = cabriolet_device_interrupt, | |
425 | ||
426 | .init_arch = pyxis_init_arch, | |
427 | .init_irq = cabriolet_init_irq, | |
428 | .init_rtc = common_init_rtc, | |
429 | .init_pci = alphapc164_init_pci, | |
430 | .kill_arch = cia_kill_arch, | |
431 | .pci_map_irq = alphapc164_map_irq, | |
432 | .pci_swizzle = common_swizzle, | |
433 | }; | |
434 | ALIAS_MV(lx164) | |
435 | #endif | |
436 | ||
437 | #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PC164) | |
438 | struct alpha_machine_vector pc164_mv __initmv = { | |
439 | .vector_name = "PC164", | |
440 | DO_EV5_MMU, | |
441 | DO_DEFAULT_RTC, | |
442 | DO_CIA_IO, | |
443 | .machine_check = cia_machine_check, | |
444 | .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS, | |
445 | .min_io_address = DEFAULT_IO_BASE, | |
446 | .min_mem_address = CIA_DEFAULT_MEM_BASE, | |
447 | ||
448 | .nr_irqs = 35, | |
449 | .device_interrupt = pc164_device_interrupt, | |
450 | ||
451 | .init_arch = cia_init_arch, | |
452 | .init_irq = pc164_init_irq, | |
453 | .init_rtc = common_init_rtc, | |
454 | .init_pci = alphapc164_init_pci, | |
455 | .kill_arch = cia_kill_arch, | |
456 | .pci_map_irq = alphapc164_map_irq, | |
457 | .pci_swizzle = common_swizzle, | |
458 | }; | |
459 | ALIAS_MV(pc164) | |
460 | #endif |