2 * linux/arch/alpha/kernel/sys_cabriolet.c
4 * Copyright (C) 1995 David A Rusling
5 * Copyright (C) 1996 Jay A Estabrook
6 * Copyright (C) 1998, 1999, 2000 Richard Henderson
8 * Code supporting the Cabriolet (AlphaPC64), EB66+, and EB164,
12 #include <linux/config.h>
13 #include <linux/kernel.h>
14 #include <linux/types.h>
16 #include <linux/sched.h>
17 #include <linux/pci.h>
18 #include <linux/init.h>
19 #include <linux/bitops.h>
21 #include <asm/ptrace.h>
22 #include <asm/system.h>
25 #include <asm/mmu_context.h>
27 #include <asm/pgtable.h>
28 #include <asm/core_apecs.h>
29 #include <asm/core_cia.h>
30 #include <asm/core_lca.h>
31 #include <asm/tlbflush.h>
36 #include "machvec_impl.h"
39 /* Note mask bit is true for DISABLED irqs. */
40 static unsigned long cached_irq_mask = ~0UL;
43 cabriolet_update_irq_hw(unsigned int irq, unsigned long mask)
45 int ofs = (irq - 16) / 8;
46 outb(mask >> (16 + ofs * 8), 0x804 + ofs);
50 cabriolet_enable_irq(unsigned int irq)
52 cabriolet_update_irq_hw(irq, cached_irq_mask &= ~(1UL << irq));
56 cabriolet_disable_irq(unsigned int irq)
58 cabriolet_update_irq_hw(irq, cached_irq_mask |= 1UL << irq);
62 cabriolet_startup_irq(unsigned int irq)
64 cabriolet_enable_irq(irq);
65 return 0; /* never anything pending */
69 cabriolet_end_irq(unsigned int irq)
71 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
72 cabriolet_enable_irq(irq);
75 static struct hw_interrupt_type cabriolet_irq_type = {
76 .typename = "CABRIOLET",
77 .startup = cabriolet_startup_irq,
78 .shutdown = cabriolet_disable_irq,
79 .enable = cabriolet_enable_irq,
80 .disable = cabriolet_disable_irq,
81 .ack = cabriolet_disable_irq,
82 .end = cabriolet_end_irq,
86 cabriolet_device_interrupt(unsigned long v, struct pt_regs *r)
91 /* Read the interrupt summary registers */
92 pld = inb(0x804) | (inb(0x805) << 8) | (inb(0x806) << 16);
95 * Now for every possible bit set, work through them and call
96 * the appropriate interrupt handler.
100 pld &= pld - 1; /* clear least bit set */
102 isa_device_interrupt(v, r);
104 handle_irq(16 + i, r);
110 common_init_irq(void (*srm_dev_int)(unsigned long v, struct pt_regs *r))
114 if (alpha_using_srm) {
115 alpha_mv.device_interrupt = srm_dev_int;
116 init_srm_irqs(35, 0);
125 for (i = 16; i < 35; ++i) {
126 irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
127 irq_desc[i].handler = &cabriolet_irq_type;
131 common_init_isa_dma();
132 setup_irq(16+4, &isa_cascade_irqaction);
135 #ifndef CONFIG_ALPHA_PC164
137 cabriolet_init_irq(void)
139 common_init_irq(srm_device_interrupt);
143 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PC164)
144 /* In theory, the PC164 has the same interrupt hardware as the other
145 Cabriolet based systems. However, something got screwed up late
146 in the development cycle which broke the interrupt masking hardware.
147 Repeat, it is not possible to mask and ack interrupts. At all.
149 In an attempt to work around this, while processing interrupts,
150 we do not allow the IPL to drop below what it is currently. This
151 prevents the possibility of recursion.
153 ??? Another option might be to force all PCI devices to use edge
154 triggered rather than level triggered interrupts. That might be
155 too invasive though. */
158 pc164_srm_device_interrupt(unsigned long v, struct pt_regs *r)
160 __min_ipl = getipl();
161 srm_device_interrupt(v, r);
166 pc164_device_interrupt(unsigned long v, struct pt_regs *r)
168 __min_ipl = getipl();
169 cabriolet_device_interrupt(v, r);
176 common_init_irq(pc164_srm_device_interrupt);
181 * The EB66+ is very similar to the EB66 except that it does not have
182 * the on-board NCR and Tulip chips. In the code below, I have used
183 * slot number to refer to the id select line and *not* the slot
184 * number used in the EB66+ documentation. However, in the table,
185 * I've given the slot number, the id select line and the Jxx number
186 * that's printed on the board. The interrupt pins from the PCI slots
187 * are wired into 3 interrupt summary registers at 0x804, 0x805 and
190 * In the table, -1 means don't assign an IRQ number. This is usually
191 * because it is the Saturn IO (SIO) PCI/ISA Bridge Chip.
194 static inline int __init
195 eb66p_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
197 static char irq_tab[5][5] __initdata = {
198 /*INT INTA INTB INTC INTD */
199 {16+0, 16+0, 16+5, 16+9, 16+13}, /* IdSel 6, slot 0, J25 */
200 {16+1, 16+1, 16+6, 16+10, 16+14}, /* IdSel 7, slot 1, J26 */
201 { -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
202 {16+2, 16+2, 16+7, 16+11, 16+15}, /* IdSel 9, slot 2, J27 */
203 {16+3, 16+3, 16+8, 16+12, 16+6} /* IdSel 10, slot 3, J28 */
205 const long min_idsel = 6, max_idsel = 10, irqs_per_slot = 5;
206 return COMMON_TABLE_LOOKUP;
211 * The AlphaPC64 is very similar to the EB66+ except that its slots
212 * are numbered differently. In the code below, I have used slot
213 * number to refer to the id select line and *not* the slot number
214 * used in the AlphaPC64 documentation. However, in the table, I've
215 * given the slot number, the id select line and the Jxx number that's
216 * printed on the board. The interrupt pins from the PCI slots are
217 * wired into 3 interrupt summary registers at 0x804, 0x805 and 0x806
220 * In the table, -1 means don't assign an IRQ number. This is usually
221 * because it is the Saturn IO (SIO) PCI/ISA Bridge Chip.
224 static inline int __init
225 cabriolet_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
227 static char irq_tab[5][5] __initdata = {
228 /*INT INTA INTB INTC INTD */
229 { 16+2, 16+2, 16+7, 16+11, 16+15}, /* IdSel 5, slot 2, J21 */
230 { 16+0, 16+0, 16+5, 16+9, 16+13}, /* IdSel 6, slot 0, J19 */
231 { 16+1, 16+1, 16+6, 16+10, 16+14}, /* IdSel 7, slot 1, J20 */
232 { -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
233 { 16+3, 16+3, 16+8, 16+12, 16+16} /* IdSel 9, slot 3, J22 */
235 const long min_idsel = 5, max_idsel = 9, irqs_per_slot = 5;
236 return COMMON_TABLE_LOOKUP;
239 static inline void __init
240 cabriolet_init_pci(void)
243 ns87312_enable_ide(0x398);
246 static inline void __init
247 cia_cab_init_pci(void)
250 ns87312_enable_ide(0x398);
254 * The PC164 and LX164 have 19 PCI interrupts, four from each of the four
255 * PCI slots, the SIO, PCI/IDE, and USB.
257 * Each of the interrupts can be individually masked. This is
258 * accomplished by setting the appropriate bit in the mask register.
259 * A bit is set by writing a "1" to the desired position in the mask
260 * register and cleared by writing a "0". There are 3 mask registers
261 * located at ISA address 804h, 805h and 806h.
263 * An I/O read at ISA address 804h, 805h, 806h will return the
264 * state of the 11 PCI interrupts and not the state of the MASKED
267 * Note: A write to I/O 804h, 805h, and 806h the mask register will be
272 * ISA +--------------------------------------------------------------+
273 * ADDRESS | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
274 * +==============================================================+
275 * 0x804 | INTB0 | USB | IDE | SIO | INTA3 |INTA2 | INTA1 | INTA0 |
276 * +--------------------------------------------------------------+
277 * 0x805 | INTD0 | INTC3 | INTC2 | INTC1 | INTC0 |INTB3 | INTB2 | INTB1 |
278 * +--------------------------------------------------------------+
279 * 0x806 | Rsrv | Rsrv | Rsrv | Rsrv | Rsrv |INTD3 | INTD2 | INTD1 |
280 * +--------------------------------------------------------------+
281 * * Rsrv = reserved bits
282 * Note: The mask register is write-only.
285 * 5 32 bit PCI option slot 2
286 * 6 64 bit PCI option slot 0
287 * 7 64 bit PCI option slot 1
289 * 9 32 bit PCI option slot 3
295 static inline int __init
296 alphapc164_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
298 static char irq_tab[7][5] __initdata = {
299 /*INT INTA INTB INTC INTD */
300 { 16+2, 16+2, 16+9, 16+13, 16+17}, /* IdSel 5, slot 2, J20 */
301 { 16+0, 16+0, 16+7, 16+11, 16+15}, /* IdSel 6, slot 0, J29 */
302 { 16+1, 16+1, 16+8, 16+12, 16+16}, /* IdSel 7, slot 1, J26 */
303 { -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
304 { 16+3, 16+3, 16+10, 16+14, 16+18}, /* IdSel 9, slot 3, J19 */
305 { 16+6, 16+6, 16+6, 16+6, 16+6}, /* IdSel 10, USB */
306 { 16+5, 16+5, 16+5, 16+5, 16+5} /* IdSel 11, IDE */
308 const long min_idsel = 5, max_idsel = 11, irqs_per_slot = 5;
309 return COMMON_TABLE_LOOKUP;
312 static inline void __init
313 alphapc164_init_pci(void)
324 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_CABRIOLET)
325 struct alpha_machine_vector cabriolet_mv __initmv = {
326 .vector_name = "Cabriolet",
330 .machine_check = apecs_machine_check,
331 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
332 .min_io_address = DEFAULT_IO_BASE,
333 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
336 .device_interrupt = cabriolet_device_interrupt,
338 .init_arch = apecs_init_arch,
339 .init_irq = cabriolet_init_irq,
340 .init_rtc = common_init_rtc,
341 .init_pci = cabriolet_init_pci,
342 .pci_map_irq = cabriolet_map_irq,
343 .pci_swizzle = common_swizzle,
345 #ifndef CONFIG_ALPHA_EB64P
350 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB164)
351 struct alpha_machine_vector eb164_mv __initmv = {
352 .vector_name = "EB164",
356 .machine_check = cia_machine_check,
357 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
358 .min_io_address = DEFAULT_IO_BASE,
359 .min_mem_address = CIA_DEFAULT_MEM_BASE,
362 .device_interrupt = cabriolet_device_interrupt,
364 .init_arch = cia_init_arch,
365 .init_irq = cabriolet_init_irq,
366 .init_rtc = common_init_rtc,
367 .init_pci = cia_cab_init_pci,
368 .kill_arch = cia_kill_arch,
369 .pci_map_irq = cabriolet_map_irq,
370 .pci_swizzle = common_swizzle,
375 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB66P)
376 struct alpha_machine_vector eb66p_mv __initmv = {
377 .vector_name = "EB66+",
381 .machine_check = lca_machine_check,
382 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
383 .min_io_address = DEFAULT_IO_BASE,
384 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
387 .device_interrupt = cabriolet_device_interrupt,
389 .init_arch = lca_init_arch,
390 .init_irq = cabriolet_init_irq,
391 .init_rtc = common_init_rtc,
392 .init_pci = cabriolet_init_pci,
393 .pci_map_irq = eb66p_map_irq,
394 .pci_swizzle = common_swizzle,
399 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_LX164)
400 struct alpha_machine_vector lx164_mv __initmv = {
401 .vector_name = "LX164",
405 .machine_check = cia_machine_check,
406 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
407 .min_io_address = DEFAULT_IO_BASE,
408 .min_mem_address = DEFAULT_MEM_BASE,
409 .pci_dac_offset = PYXIS_DAC_OFFSET,
412 .device_interrupt = cabriolet_device_interrupt,
414 .init_arch = pyxis_init_arch,
415 .init_irq = cabriolet_init_irq,
416 .init_rtc = common_init_rtc,
417 .init_pci = alphapc164_init_pci,
418 .kill_arch = cia_kill_arch,
419 .pci_map_irq = alphapc164_map_irq,
420 .pci_swizzle = common_swizzle,
425 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PC164)
426 struct alpha_machine_vector pc164_mv __initmv = {
427 .vector_name = "PC164",
431 .machine_check = cia_machine_check,
432 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
433 .min_io_address = DEFAULT_IO_BASE,
434 .min_mem_address = CIA_DEFAULT_MEM_BASE,
437 .device_interrupt = pc164_device_interrupt,
439 .init_arch = cia_init_arch,
440 .init_irq = pc164_init_irq,
441 .init_rtc = common_init_rtc,
442 .init_pci = alphapc164_init_pci,
443 .kill_arch = cia_kill_arch,
444 .pci_map_irq = alphapc164_map_irq,
445 .pci_swizzle = common_swizzle,