1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  *	linux/arch/alpha/kernel/sys_cabriolet.c
4  *
5  *	Copyright (C) 1995 David A Rusling
6  *	Copyright (C) 1996 Jay A Estabrook
7  *	Copyright (C) 1998, 1999, 2000 Richard Henderson
8  *
9  * Code supporting the Cabriolet (AlphaPC64), EB66+, and EB164,
10  * PC164 and LX164.
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/bitops.h>
20 
21 #include <asm/ptrace.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/core_apecs.h>
27 #include <asm/core_cia.h>
28 #include <asm/core_lca.h>
29 #include <asm/tlbflush.h>
30 
31 #include "proto.h"
32 #include "irq_impl.h"
33 #include "pci_impl.h"
34 #include "machvec_impl.h"
35 #include "pc873xx.h"
36 
37 /* Note mask bit is true for DISABLED irqs.  */
38 static unsigned long cached_irq_mask = ~0UL;
39 
40 static inline void
cabriolet_update_irq_hw(unsigned int irq,unsigned long mask)41 cabriolet_update_irq_hw(unsigned int irq, unsigned long mask)
42 {
43 	int ofs = (irq - 16) / 8;
44 	outb(mask >> (16 + ofs * 8), 0x804 + ofs);
45 }
46 
47 static inline void
cabriolet_enable_irq(struct irq_data * d)48 cabriolet_enable_irq(struct irq_data *d)
49 {
50 	cabriolet_update_irq_hw(d->irq, cached_irq_mask &= ~(1UL << d->irq));
51 }
52 
53 static void
cabriolet_disable_irq(struct irq_data * d)54 cabriolet_disable_irq(struct irq_data *d)
55 {
56 	cabriolet_update_irq_hw(d->irq, cached_irq_mask |= 1UL << d->irq);
57 }
58 
59 static struct irq_chip cabriolet_irq_type = {
60 	.name		= "CABRIOLET",
61 	.irq_unmask	= cabriolet_enable_irq,
62 	.irq_mask	= cabriolet_disable_irq,
63 	.irq_mask_ack	= cabriolet_disable_irq,
64 };
65 
66 static void
cabriolet_device_interrupt(unsigned long v)67 cabriolet_device_interrupt(unsigned long v)
68 {
69 	unsigned long pld;
70 	unsigned int i;
71 
72 	/* Read the interrupt summary registers */
73 	pld = inb(0x804) | (inb(0x805) << 8) | (inb(0x806) << 16);
74 
75 	/*
76 	 * Now for every possible bit set, work through them and call
77 	 * the appropriate interrupt handler.
78 	 */
79 	while (pld) {
80 		i = ffz(~pld);
81 		pld &= pld - 1;	/* clear least bit set */
82 		if (i == 4) {
83 			isa_device_interrupt(v);
84 		} else {
85 			handle_irq(16 + i);
86 		}
87 	}
88 }
89 
90 static void __init
common_init_irq(void (* srm_dev_int)(unsigned long v))91 common_init_irq(void (*srm_dev_int)(unsigned long v))
92 {
93 	init_i8259a_irqs();
94 
95 	if (alpha_using_srm) {
96 		alpha_mv.device_interrupt = srm_dev_int;
97 		init_srm_irqs(35, 0);
98 	}
99 	else {
100 		long i;
101 
102 		outb(0xff, 0x804);
103 		outb(0xff, 0x805);
104 		outb(0xff, 0x806);
105 
106 		for (i = 16; i < 35; ++i) {
107 			irq_set_chip_and_handler(i, &cabriolet_irq_type,
108 						 handle_level_irq);
109 			irq_set_status_flags(i, IRQ_LEVEL);
110 		}
111 	}
112 
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");
116 }
117 
118 #ifndef CONFIG_ALPHA_PC164
119 static void __init
cabriolet_init_irq(void)120 cabriolet_init_irq(void)
121 {
122 	common_init_irq(srm_device_interrupt);
123 }
124 #endif
125 
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.
131 
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.
135 
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.  */
139 
140 static void
pc164_srm_device_interrupt(unsigned long v)141 pc164_srm_device_interrupt(unsigned long v)
142 {
143 	__min_ipl = getipl();
144 	srm_device_interrupt(v);
145 	__min_ipl = 0;
146 }
147 
148 static void
pc164_device_interrupt(unsigned long v)149 pc164_device_interrupt(unsigned long v)
150 {
151 	__min_ipl = getipl();
152 	cabriolet_device_interrupt(v);
153 	__min_ipl = 0;
154 }
155 
156 static void __init
pc164_init_irq(void)157 pc164_init_irq(void)
158 {
159 	common_init_irq(pc164_srm_device_interrupt);
160 }
161 #endif
162 
163 /*
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
171  * 0x806 ISA.
172  *
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.
175  */
176 
177 static inline int
eb66p_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)178 eb66p_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
179 {
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 */
187 	};
188 	const long min_idsel = 6, max_idsel = 10, irqs_per_slot = 5;
189 	return COMMON_TABLE_LOOKUP;
190 }
191 
192 
193 /*
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
201  * ISA.
202  *
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.
205  */
206 
207 static inline int
cabriolet_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)208 cabriolet_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
209 {
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 */
217 	};
218 	const long min_idsel = 5, max_idsel = 9, irqs_per_slot = 5;
219 	return COMMON_TABLE_LOOKUP;
220 }
221 
222 static inline void __init
cabriolet_enable_ide(void)223 cabriolet_enable_ide(void)
224 {
225 	if (pc873xx_probe() == -1) {
226 		printk(KERN_ERR "Probing for PC873xx Super IO chip failed.\n");
227 	 } else {
228 		printk(KERN_INFO "Found %s Super IO chip at 0x%x\n",
229 			pc873xx_get_model(), pc873xx_get_base());
230 
231 		pc873xx_enable_ide();
232 	}
233 }
234 
235 static inline void __init
cabriolet_init_pci(void)236 cabriolet_init_pci(void)
237 {
238 	common_init_pci();
239 	cabriolet_enable_ide();
240 }
241 
242 static inline void __init
cia_cab_init_pci(void)243 cia_cab_init_pci(void)
244 {
245 	cia_init_pci();
246 	cabriolet_enable_ide();
247 }
248 
249 /*
250  * The PC164 and LX164 have 19 PCI interrupts, four from each of the four
251  * PCI slots, the SIO, PCI/IDE, and USB.
252  *
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.
258  *
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
261  * interrupts.
262  *
263  * Note: A write to I/O 804h, 805h, and 806h the mask register will be
264  * updated.
265  *
266  *
267  * 				ISA DATA<7:0>
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.
279  *
280  * IdSel
281  *   5	 32 bit PCI option slot 2
282  *   6	 64 bit PCI option slot 0
283  *   7	 64 bit PCI option slot 1
284  *   8	 Saturn I/O
285  *   9	 32 bit PCI option slot 3
286  *  10	 USB
287  *  11	 IDE
288  *
289  */
290 
291 static inline int
alphapc164_map_irq(const struct pci_dev * dev,u8 slot,u8 pin)292 alphapc164_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
293 {
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 */
303 	};
304 	const long min_idsel = 5, max_idsel = 11, irqs_per_slot = 5;
305 	return COMMON_TABLE_LOOKUP;
306 }
307 
308 static inline void __init
alphapc164_init_pci(void)309 alphapc164_init_pci(void)
310 {
311 	cia_init_pci();
312 	SMC93x_Init();
313 }
314 
315 
316 /*
317  * The System Vector
318  */
319 
320 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_CABRIOLET)
321 struct alpha_machine_vector cabriolet_mv __initmv = {
322 	.vector_name		= "Cabriolet",
323 	DO_EV4_MMU,
324 	DO_DEFAULT_RTC,
325 	DO_APECS_IO,
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,
330 
331 	.nr_irqs		= 35,
332 	.device_interrupt	= cabriolet_device_interrupt,
333 
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,
340 };
341 #ifndef CONFIG_ALPHA_EB64P
342 ALIAS_MV(cabriolet)
343 #endif
344 #endif
345 
346 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB164)
347 struct alpha_machine_vector eb164_mv __initmv = {
348 	.vector_name		= "EB164",
349 	DO_EV5_MMU,
350 	DO_DEFAULT_RTC,
351 	DO_CIA_IO,
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,
356 
357 	.nr_irqs		= 35,
358 	.device_interrupt	= cabriolet_device_interrupt,
359 
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,
367 };
368 ALIAS_MV(eb164)
369 #endif
370 
371 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_EB66P)
372 struct alpha_machine_vector eb66p_mv __initmv = {
373 	.vector_name		= "EB66+",
374 	DO_EV4_MMU,
375 	DO_DEFAULT_RTC,
376 	DO_LCA_IO,
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,
381 
382 	.nr_irqs		= 35,
383 	.device_interrupt	= cabriolet_device_interrupt,
384 
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,
391 };
392 ALIAS_MV(eb66p)
393 #endif
394 
395 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_LX164)
396 struct alpha_machine_vector lx164_mv __initmv = {
397 	.vector_name		= "LX164",
398 	DO_EV5_MMU,
399 	DO_DEFAULT_RTC,
400 	DO_PYXIS_IO,
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,
406 
407 	.nr_irqs		= 35,
408 	.device_interrupt	= cabriolet_device_interrupt,
409 
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,
417 };
418 ALIAS_MV(lx164)
419 #endif
420 
421 #if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PC164)
422 struct alpha_machine_vector pc164_mv __initmv = {
423 	.vector_name		= "PC164",
424 	DO_EV5_MMU,
425 	DO_DEFAULT_RTC,
426 	DO_CIA_IO,
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,
431 
432 	.nr_irqs		= 35,
433 	.device_interrupt	= pc164_device_interrupt,
434 
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,
442 };
443 ALIAS_MV(pc164)
444 #endif
445