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/kernel.h>
13 #include <linux/types.h>
15 #include <linux/sched.h>
16 #include <linux/pci.h>
17 #include <linux/init.h>
18 #include <linux/bitops.h>
20 #include <asm/ptrace.h>
21 #include <asm/system.h>
24 #include <asm/mmu_context.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>
35 #include "machvec_impl.h"
38 /* Note mask bit is true for DISABLED irqs. */
39 static unsigned long cached_irq_mask = ~0UL;
42 cabriolet_update_irq_hw(unsigned int irq, unsigned long mask)
44 int ofs = (irq - 16) / 8;
45 outb(mask >> (16 + ofs * 8), 0x804 + ofs);
49 cabriolet_enable_irq(unsigned int irq)
51 cabriolet_update_irq_hw(irq, cached_irq_mask &= ~(1UL << irq));
55 cabriolet_disable_irq(unsigned int irq)
57 cabriolet_update_irq_hw(irq, cached_irq_mask |= 1UL << irq);
61 cabriolet_startup_irq(unsigned int irq)
63 cabriolet_enable_irq(irq);
64 return 0; /* never anything pending */
68 cabriolet_end_irq(unsigned int irq)
70 if (!(irq_desc[irq].status & (IRQ_DISABLED|IRQ_INPROGRESS)))
71 cabriolet_enable_irq(irq);
74 static struct hw_interrupt_type cabriolet_irq_type = {
75 .typename = "CABRIOLET",
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,
85 cabriolet_device_interrupt(unsigned long v)
90 /* Read the interrupt summary registers */
91 pld = inb(0x804) | (inb(0x805) << 8) | (inb(0x806) << 16);
94 * Now for every possible bit set, work through them and call
95 * the appropriate interrupt handler.
99 pld &= pld - 1; /* clear least bit set */
101 isa_device_interrupt(v);
109 common_init_irq(void (*srm_dev_int)(unsigned long v))
113 if (alpha_using_srm) {
114 alpha_mv.device_interrupt = srm_dev_int;
115 init_srm_irqs(35, 0);
124 for (i = 16; i < 35; ++i) {
125 irq_desc[i].status = IRQ_DISABLED | IRQ_LEVEL;
126 irq_desc[i].chip = &cabriolet_irq_type;
130 common_init_isa_dma();
131 setup_irq(16+4, &isa_cascade_irqaction);
134 #ifndef CONFIG_ALPHA_PC164
136 cabriolet_init_irq(void)
138 common_init_irq(srm_device_interrupt);
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.
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.
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. */
157 pc164_srm_device_interrupt(unsigned long v)
159 __min_ipl = getipl();
160 srm_device_interrupt(v);
165 pc164_device_interrupt(unsigned long v)
167 __min_ipl = getipl();
168 cabriolet_device_interrupt(v);
175 common_init_irq(pc164_srm_device_interrupt);
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
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.
193 static inline int __init
194 eb66p_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
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 */
204 const long min_idsel = 6, max_idsel = 10, irqs_per_slot = 5;
205 return COMMON_TABLE_LOOKUP;
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
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.
223 static inline int __init
224 cabriolet_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
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 */
234 const long min_idsel = 5, max_idsel = 9, irqs_per_slot = 5;
235 return COMMON_TABLE_LOOKUP;
238 static inline void __init
239 cabriolet_init_pci(void)
242 ns87312_enable_ide(0x398);
245 static inline void __init
246 cia_cab_init_pci(void)
249 ns87312_enable_ide(0x398);
253 * The PC164 and LX164 have 19 PCI interrupts, four from each of the four
254 * PCI slots, the SIO, PCI/IDE, and USB.
256 * Each of the interrupts can be individually masked. This is
257 * accomplished by setting the appropriate bit in the mask register.
258 * A bit is set by writing a "1" to the desired position in the mask
259 * register and cleared by writing a "0". There are 3 mask registers
260 * located at ISA address 804h, 805h and 806h.
262 * An I/O read at ISA address 804h, 805h, 806h will return the
263 * state of the 11 PCI interrupts and not the state of the MASKED
266 * Note: A write to I/O 804h, 805h, and 806h the mask register will be
271 * ISA +--------------------------------------------------------------+
272 * ADDRESS | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
273 * +==============================================================+
274 * 0x804 | INTB0 | USB | IDE | SIO | INTA3 |INTA2 | INTA1 | INTA0 |
275 * +--------------------------------------------------------------+
276 * 0x805 | INTD0 | INTC3 | INTC2 | INTC1 | INTC0 |INTB3 | INTB2 | INTB1 |
277 * +--------------------------------------------------------------+
278 * 0x806 | Rsrv | Rsrv | Rsrv | Rsrv | Rsrv |INTD3 | INTD2 | INTD1 |
279 * +--------------------------------------------------------------+
280 * * Rsrv = reserved bits
281 * Note: The mask register is write-only.
284 * 5 32 bit PCI option slot 2
285 * 6 64 bit PCI option slot 0
286 * 7 64 bit PCI option slot 1
288 * 9 32 bit PCI option slot 3
294 static inline int __init
295 alphapc164_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
297 static char irq_tab[7][5] __initdata = {
298 /*INT INTA INTB INTC INTD */
299 { 16+2, 16+2, 16+9, 16+13, 16+17}, /* IdSel 5, slot 2, J20 */
300 { 16+0, 16+0, 16+7, 16+11, 16+15}, /* IdSel 6, slot 0, J29 */
301 { 16+1, 16+1, 16+8, 16+12, 16+16}, /* IdSel 7, slot 1, J26 */
302 { -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
303 { 16+3, 16+3, 16+10, 16+14, 16+18}, /* IdSel 9, slot 3, J19 */
304 { 16+6, 16+6, 16+6, 16+6, 16+6}, /* IdSel 10, USB */
305 { 16+5, 16+5, 16+5, 16+5, 16+5} /* IdSel 11, IDE */
307 const long min_idsel = 5, max_idsel = 11, irqs_per_slot = 5;
308 return COMMON_TABLE_LOOKUP;
311 static inline void __init
312 alphapc164_init_pci(void)
323 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_CABRIOLET)
324 struct alpha_machine_vector cabriolet_mv __initmv = {
325 .vector_name = "Cabriolet",
329 .machine_check = apecs_machine_check,
330 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
331 .min_io_address = DEFAULT_IO_BASE,
332 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
335 .device_interrupt = cabriolet_device_interrupt,
337 .init_arch = apecs_init_arch,
338 .init_irq = cabriolet_init_irq,
339 .init_rtc = common_init_rtc,
340 .init_pci = cabriolet_init_pci,
341 .pci_map_irq = cabriolet_map_irq,
342 .pci_swizzle = common_swizzle,
344 #ifndef CONFIG_ALPHA_EB64P
349 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB164)
350 struct alpha_machine_vector eb164_mv __initmv = {
351 .vector_name = "EB164",
355 .machine_check = cia_machine_check,
356 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
357 .min_io_address = DEFAULT_IO_BASE,
358 .min_mem_address = CIA_DEFAULT_MEM_BASE,
361 .device_interrupt = cabriolet_device_interrupt,
363 .init_arch = cia_init_arch,
364 .init_irq = cabriolet_init_irq,
365 .init_rtc = common_init_rtc,
366 .init_pci = cia_cab_init_pci,
367 .kill_arch = cia_kill_arch,
368 .pci_map_irq = cabriolet_map_irq,
369 .pci_swizzle = common_swizzle,
374 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB66P)
375 struct alpha_machine_vector eb66p_mv __initmv = {
376 .vector_name = "EB66+",
380 .machine_check = lca_machine_check,
381 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
382 .min_io_address = DEFAULT_IO_BASE,
383 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
386 .device_interrupt = cabriolet_device_interrupt,
388 .init_arch = lca_init_arch,
389 .init_irq = cabriolet_init_irq,
390 .init_rtc = common_init_rtc,
391 .init_pci = cabriolet_init_pci,
392 .pci_map_irq = eb66p_map_irq,
393 .pci_swizzle = common_swizzle,
398 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_LX164)
399 struct alpha_machine_vector lx164_mv __initmv = {
400 .vector_name = "LX164",
404 .machine_check = cia_machine_check,
405 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
406 .min_io_address = DEFAULT_IO_BASE,
407 .min_mem_address = DEFAULT_MEM_BASE,
408 .pci_dac_offset = PYXIS_DAC_OFFSET,
411 .device_interrupt = cabriolet_device_interrupt,
413 .init_arch = pyxis_init_arch,
414 .init_irq = cabriolet_init_irq,
415 .init_rtc = common_init_rtc,
416 .init_pci = alphapc164_init_pci,
417 .kill_arch = cia_kill_arch,
418 .pci_map_irq = alphapc164_map_irq,
419 .pci_swizzle = common_swizzle,
424 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PC164)
425 struct alpha_machine_vector pc164_mv __initmv = {
426 .vector_name = "PC164",
430 .machine_check = cia_machine_check,
431 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
432 .min_io_address = DEFAULT_IO_BASE,
433 .min_mem_address = CIA_DEFAULT_MEM_BASE,
436 .device_interrupt = pc164_device_interrupt,
438 .init_arch = cia_init_arch,
439 .init_irq = pc164_init_irq,
440 .init_rtc = common_init_rtc,
441 .init_pci = alphapc164_init_pci,
442 .kill_arch = cia_kill_arch,
443 .pci_map_irq = alphapc164_map_irq,
444 .pci_swizzle = common_swizzle,