1 // SPDX-License-Identifier: GPL-2.0
3 * linux/arch/alpha/kernel/sys_cabriolet.c
5 * Copyright (C) 1995 David A Rusling
6 * Copyright (C) 1996 Jay A Estabrook
7 * Copyright (C) 1998, 1999, 2000 Richard Henderson
9 * Code supporting the Cabriolet (AlphaPC64), EB66+, and EB164,
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>
24 #include <asm/mmu_context.h>
26 #include <asm/core_apecs.h>
27 #include <asm/core_cia.h>
28 #include <asm/core_lca.h>
29 #include <asm/tlbflush.h>
34 #include "machvec_impl.h"
37 /* Note mask bit is true for DISABLED irqs. */
38 static unsigned long cached_irq_mask = ~0UL;
41 cabriolet_update_irq_hw(unsigned int irq, unsigned long mask)
43 int ofs = (irq - 16) / 8;
44 outb(mask >> (16 + ofs * 8), 0x804 + ofs);
48 cabriolet_enable_irq(struct irq_data *d)
50 cabriolet_update_irq_hw(d->irq, cached_irq_mask &= ~(1UL << d->irq));
54 cabriolet_disable_irq(struct irq_data *d)
56 cabriolet_update_irq_hw(d->irq, cached_irq_mask |= 1UL << d->irq);
59 static struct irq_chip cabriolet_irq_type = {
61 .irq_unmask = cabriolet_enable_irq,
62 .irq_mask = cabriolet_disable_irq,
63 .irq_mask_ack = cabriolet_disable_irq,
67 cabriolet_device_interrupt(unsigned long v)
72 /* Read the interrupt summary registers */
73 pld = inb(0x804) | (inb(0x805) << 8) | (inb(0x806) << 16);
76 * Now for every possible bit set, work through them and call
77 * the appropriate interrupt handler.
81 pld &= pld - 1; /* clear least bit set */
83 isa_device_interrupt(v);
91 common_init_irq(void (*srm_dev_int)(unsigned long v))
95 if (alpha_using_srm) {
96 alpha_mv.device_interrupt = srm_dev_int;
106 for (i = 16; i < 35; ++i) {
107 irq_set_chip_and_handler(i, &cabriolet_irq_type,
109 irq_set_status_flags(i, IRQ_LEVEL);
113 common_init_isa_dma();
114 if (request_irq(16 + 4, no_action, 0, "isa-cascade", NULL))
115 pr_err("Failed to register isa-cascade interrupt\n");
118 #ifndef CONFIG_ALPHA_PC164
120 cabriolet_init_irq(void)
122 common_init_irq(srm_device_interrupt);
126 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PC164)
127 /* In theory, the PC164 has the same interrupt hardware as the other
128 Cabriolet based systems. However, something got screwed up late
129 in the development cycle which broke the interrupt masking hardware.
130 Repeat, it is not possible to mask and ack interrupts. At all.
132 In an attempt to work around this, while processing interrupts,
133 we do not allow the IPL to drop below what it is currently. This
134 prevents the possibility of recursion.
136 ??? Another option might be to force all PCI devices to use edge
137 triggered rather than level triggered interrupts. That might be
138 too invasive though. */
141 pc164_srm_device_interrupt(unsigned long v)
143 __min_ipl = getipl();
144 srm_device_interrupt(v);
149 pc164_device_interrupt(unsigned long v)
151 __min_ipl = getipl();
152 cabriolet_device_interrupt(v);
159 common_init_irq(pc164_srm_device_interrupt);
164 * The EB66+ is very similar to the EB66 except that it does not have
165 * the on-board NCR and Tulip chips. In the code below, I have used
166 * slot number to refer to the id select line and *not* the slot
167 * number used in the EB66+ documentation. However, in the table,
168 * I've given the slot number, the id select line and the Jxx number
169 * that's printed on the board. The interrupt pins from the PCI slots
170 * are wired into 3 interrupt summary registers at 0x804, 0x805 and
173 * In the table, -1 means don't assign an IRQ number. This is usually
174 * because it is the Saturn IO (SIO) PCI/ISA Bridge Chip.
178 eb66p_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
180 static char irq_tab[5][5] = {
181 /*INT INTA INTB INTC INTD */
182 {16+0, 16+0, 16+5, 16+9, 16+13}, /* IdSel 6, slot 0, J25 */
183 {16+1, 16+1, 16+6, 16+10, 16+14}, /* IdSel 7, slot 1, J26 */
184 { -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
185 {16+2, 16+2, 16+7, 16+11, 16+15}, /* IdSel 9, slot 2, J27 */
186 {16+3, 16+3, 16+8, 16+12, 16+6} /* IdSel 10, slot 3, J28 */
188 const long min_idsel = 6, max_idsel = 10, irqs_per_slot = 5;
189 return COMMON_TABLE_LOOKUP;
194 * The AlphaPC64 is very similar to the EB66+ except that its slots
195 * are numbered differently. In the code below, I have used slot
196 * number to refer to the id select line and *not* the slot number
197 * used in the AlphaPC64 documentation. However, in the table, I've
198 * given the slot number, the id select line and the Jxx number that's
199 * printed on the board. The interrupt pins from the PCI slots are
200 * wired into 3 interrupt summary registers at 0x804, 0x805 and 0x806
203 * In the table, -1 means don't assign an IRQ number. This is usually
204 * because it is the Saturn IO (SIO) PCI/ISA Bridge Chip.
208 cabriolet_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
210 static char irq_tab[5][5] = {
211 /*INT INTA INTB INTC INTD */
212 { 16+2, 16+2, 16+7, 16+11, 16+15}, /* IdSel 5, slot 2, J21 */
213 { 16+0, 16+0, 16+5, 16+9, 16+13}, /* IdSel 6, slot 0, J19 */
214 { 16+1, 16+1, 16+6, 16+10, 16+14}, /* IdSel 7, slot 1, J20 */
215 { -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
216 { 16+3, 16+3, 16+8, 16+12, 16+16} /* IdSel 9, slot 3, J22 */
218 const long min_idsel = 5, max_idsel = 9, irqs_per_slot = 5;
219 return COMMON_TABLE_LOOKUP;
222 static inline void __init
223 cabriolet_enable_ide(void)
225 if (pc873xx_probe() == -1) {
226 printk(KERN_ERR "Probing for PC873xx Super IO chip failed.\n");
228 printk(KERN_INFO "Found %s Super IO chip at 0x%x\n",
229 pc873xx_get_model(), pc873xx_get_base());
231 pc873xx_enable_ide();
235 static inline void __init
236 cabriolet_init_pci(void)
239 cabriolet_enable_ide();
242 static inline void __init
243 cia_cab_init_pci(void)
246 cabriolet_enable_ide();
250 * The PC164 and LX164 have 19 PCI interrupts, four from each of the four
251 * PCI slots, the SIO, PCI/IDE, and USB.
253 * Each of the interrupts can be individually masked. This is
254 * accomplished by setting the appropriate bit in the mask register.
255 * A bit is set by writing a "1" to the desired position in the mask
256 * register and cleared by writing a "0". There are 3 mask registers
257 * located at ISA address 804h, 805h and 806h.
259 * An I/O read at ISA address 804h, 805h, 806h will return the
260 * state of the 11 PCI interrupts and not the state of the MASKED
263 * Note: A write to I/O 804h, 805h, and 806h the mask register will be
268 * ISA +--------------------------------------------------------------+
269 * ADDRESS | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
270 * +==============================================================+
271 * 0x804 | INTB0 | USB | IDE | SIO | INTA3 |INTA2 | INTA1 | INTA0 |
272 * +--------------------------------------------------------------+
273 * 0x805 | INTD0 | INTC3 | INTC2 | INTC1 | INTC0 |INTB3 | INTB2 | INTB1 |
274 * +--------------------------------------------------------------+
275 * 0x806 | Rsrv | Rsrv | Rsrv | Rsrv | Rsrv |INTD3 | INTD2 | INTD1 |
276 * +--------------------------------------------------------------+
277 * * Rsrv = reserved bits
278 * Note: The mask register is write-only.
281 * 5 32 bit PCI option slot 2
282 * 6 64 bit PCI option slot 0
283 * 7 64 bit PCI option slot 1
285 * 9 32 bit PCI option slot 3
292 alphapc164_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
294 static char irq_tab[7][5] = {
295 /*INT INTA INTB INTC INTD */
296 { 16+2, 16+2, 16+9, 16+13, 16+17}, /* IdSel 5, slot 2, J20 */
297 { 16+0, 16+0, 16+7, 16+11, 16+15}, /* IdSel 6, slot 0, J29 */
298 { 16+1, 16+1, 16+8, 16+12, 16+16}, /* IdSel 7, slot 1, J26 */
299 { -1, -1, -1, -1, -1}, /* IdSel 8, SIO */
300 { 16+3, 16+3, 16+10, 16+14, 16+18}, /* IdSel 9, slot 3, J19 */
301 { 16+6, 16+6, 16+6, 16+6, 16+6}, /* IdSel 10, USB */
302 { 16+5, 16+5, 16+5, 16+5, 16+5} /* IdSel 11, IDE */
304 const long min_idsel = 5, max_idsel = 11, irqs_per_slot = 5;
305 return COMMON_TABLE_LOOKUP;
308 static inline void __init
309 alphapc164_init_pci(void)
320 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_CABRIOLET)
321 struct alpha_machine_vector cabriolet_mv __initmv = {
322 .vector_name = "Cabriolet",
326 .machine_check = apecs_machine_check,
327 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
328 .min_io_address = DEFAULT_IO_BASE,
329 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
332 .device_interrupt = cabriolet_device_interrupt,
334 .init_arch = apecs_init_arch,
335 .init_irq = cabriolet_init_irq,
336 .init_rtc = common_init_rtc,
337 .init_pci = cabriolet_init_pci,
338 .pci_map_irq = cabriolet_map_irq,
339 .pci_swizzle = common_swizzle,
341 #ifndef CONFIG_ALPHA_EB64P
346 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB164)
347 struct alpha_machine_vector eb164_mv __initmv = {
348 .vector_name = "EB164",
352 .machine_check = cia_machine_check,
353 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
354 .min_io_address = DEFAULT_IO_BASE,
355 .min_mem_address = CIA_DEFAULT_MEM_BASE,
358 .device_interrupt = cabriolet_device_interrupt,
360 .init_arch = cia_init_arch,
361 .init_irq = cabriolet_init_irq,
362 .init_rtc = common_init_rtc,
363 .init_pci = cia_cab_init_pci,
364 .kill_arch = cia_kill_arch,
365 .pci_map_irq = cabriolet_map_irq,
366 .pci_swizzle = common_swizzle,
371 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB66P)
372 struct alpha_machine_vector eb66p_mv __initmv = {
373 .vector_name = "EB66+",
377 .machine_check = lca_machine_check,
378 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
379 .min_io_address = DEFAULT_IO_BASE,
380 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
383 .device_interrupt = cabriolet_device_interrupt,
385 .init_arch = lca_init_arch,
386 .init_irq = cabriolet_init_irq,
387 .init_rtc = common_init_rtc,
388 .init_pci = cabriolet_init_pci,
389 .pci_map_irq = eb66p_map_irq,
390 .pci_swizzle = common_swizzle,
395 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_LX164)
396 struct alpha_machine_vector lx164_mv __initmv = {
397 .vector_name = "LX164",
401 .machine_check = cia_machine_check,
402 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
403 .min_io_address = DEFAULT_IO_BASE,
404 .min_mem_address = DEFAULT_MEM_BASE,
405 .pci_dac_offset = PYXIS_DAC_OFFSET,
408 .device_interrupt = cabriolet_device_interrupt,
410 .init_arch = pyxis_init_arch,
411 .init_irq = cabriolet_init_irq,
412 .init_rtc = common_init_rtc,
413 .init_pci = alphapc164_init_pci,
414 .kill_arch = cia_kill_arch,
415 .pci_map_irq = alphapc164_map_irq,
416 .pci_swizzle = common_swizzle,
421 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PC164)
422 struct alpha_machine_vector pc164_mv __initmv = {
423 .vector_name = "PC164",
427 .machine_check = cia_machine_check,
428 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
429 .min_io_address = DEFAULT_IO_BASE,
430 .min_mem_address = CIA_DEFAULT_MEM_BASE,
433 .device_interrupt = pc164_device_interrupt,
435 .init_arch = cia_init_arch,
436 .init_irq = pc164_init_irq,
437 .init_rtc = common_init_rtc,
438 .init_pci = alphapc164_init_pci,
439 .kill_arch = cia_kill_arch,
440 .pci_map_irq = alphapc164_map_irq,
441 .pci_swizzle = common_swizzle,