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1da177e4
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1/*
2 * linux/arch/alpha/kernel/sys_noritake.c
3 *
4 * Copyright (C) 1995 David A Rusling
5 * Copyright (C) 1996 Jay A Estabrook
6 * Copyright (C) 1998, 1999 Richard Henderson
7 *
8 * Code supporting the NORITAKE (AlphaServer 1000A),
9 * CORELLE (AlphaServer 800), and ALCOR Primo (AlphaStation 600A).
10 */
11
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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/tlbflush.h>
30
31#include "proto.h"
32#include "irq_impl.h"
33#include "pci_impl.h"
34#include "machvec_impl.h"
35
36/* Note mask bit is true for ENABLED irqs. */
37static int cached_irq_mask;
38
39static inline void
40noritake_update_irq_hw(int irq, int mask)
41{
42 int port = 0x54a;
43 if (irq >= 32) {
44 mask >>= 16;
45 port = 0x54c;
46 }
47 outw(mask, port);
48}
49
50static void
76f4645f 51noritake_enable_irq(struct irq_data *d)
1da177e4 52{
76f4645f 53 noritake_update_irq_hw(d->irq, cached_irq_mask |= 1 << (d->irq - 16));
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54}
55
56static void
76f4645f 57noritake_disable_irq(struct irq_data *d)
1da177e4 58{
76f4645f 59 noritake_update_irq_hw(d->irq, cached_irq_mask &= ~(1 << (d->irq - 16)));
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60}
61
44377f62 62static struct irq_chip noritake_irq_type = {
8ab1221c 63 .name = "NORITAKE",
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64 .irq_unmask = noritake_enable_irq,
65 .irq_mask = noritake_disable_irq,
66 .irq_mask_ack = noritake_disable_irq,
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67};
68
69static void
7ca56053 70noritake_device_interrupt(unsigned long vector)
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71{
72 unsigned long pld;
73 unsigned int i;
74
75 /* Read the interrupt summary registers of NORITAKE */
76 pld = (((unsigned long) inw(0x54c) << 32)
77 | ((unsigned long) inw(0x54a) << 16)
78 | ((unsigned long) inb(0xa0) << 8)
79 | inb(0x20));
80
81 /*
82 * Now for every possible bit set, work through them and call
83 * the appropriate interrupt handler.
84 */
85 while (pld) {
86 i = ffz(~pld);
87 pld &= pld - 1; /* clear least bit set */
88 if (i < 16) {
7ca56053 89 isa_device_interrupt(vector);
1da177e4 90 } else {
3dbb8c62 91 handle_irq(i);
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92 }
93 }
94}
95
96static void
7ca56053 97noritake_srm_device_interrupt(unsigned long vector)
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98{
99 int irq;
100
101 irq = (vector - 0x800) >> 4;
102
103 /*
104 * I really hate to do this, too, but the NORITAKE SRM console also
105 * reports PCI vectors *lower* than I expected from the bit numbers
106 * in the documentation.
107 * But I really don't want to change the fixup code for allocation
108 * of IRQs, nor the alpha_irq_mask maintenance stuff, both of which
109 * look nice and clean now.
110 * So, here's this additional grotty hack... :-(
111 */
112 if (irq >= 16)
113 irq = irq + 1;
114
3dbb8c62 115 handle_irq(irq);
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116}
117
118static void __init
119noritake_init_irq(void)
120{
121 long i;
122
123 if (alpha_using_srm)
124 alpha_mv.device_interrupt = noritake_srm_device_interrupt;
125
126 outw(0, 0x54a);
127 outw(0, 0x54c);
128
129 for (i = 16; i < 48; ++i) {
7d209c81 130 set_irq_chip_and_handler(i, &noritake_irq_type, handle_level_irq);
76f4645f 131 irq_set_status_flags(i, IRQ_LEVEL);
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132 }
133
134 init_i8259a_irqs();
135 common_init_isa_dma();
136}
137
138
139/*
140 * PCI Fixup configuration.
141 *
142 * Summary @ 0x542, summary register #1:
143 * Bit Meaning
144 * 0 All valid ints from summary regs 2 & 3
145 * 1 QLOGIC ISP1020A SCSI
146 * 2 Interrupt Line A from slot 0
147 * 3 Interrupt Line B from slot 0
148 * 4 Interrupt Line A from slot 1
149 * 5 Interrupt line B from slot 1
150 * 6 Interrupt Line A from slot 2
151 * 7 Interrupt Line B from slot 2
152 * 8 Interrupt Line A from slot 3
153 * 9 Interrupt Line B from slot 3
154 *10 Interrupt Line A from slot 4
155 *11 Interrupt Line B from slot 4
156 *12 Interrupt Line A from slot 5
157 *13 Interrupt Line B from slot 5
158 *14 Interrupt Line A from slot 6
159 *15 Interrupt Line B from slot 6
160 *
161 * Summary @ 0x544, summary register #2:
162 * Bit Meaning
163 * 0 OR of all unmasked ints in SR #2
164 * 1 OR of secondary bus ints
165 * 2 Interrupt Line C from slot 0
166 * 3 Interrupt Line D from slot 0
167 * 4 Interrupt Line C from slot 1
168 * 5 Interrupt line D from slot 1
169 * 6 Interrupt Line C from slot 2
170 * 7 Interrupt Line D from slot 2
171 * 8 Interrupt Line C from slot 3
172 * 9 Interrupt Line D from slot 3
173 *10 Interrupt Line C from slot 4
174 *11 Interrupt Line D from slot 4
175 *12 Interrupt Line C from slot 5
176 *13 Interrupt Line D from slot 5
177 *14 Interrupt Line C from slot 6
178 *15 Interrupt Line D from slot 6
179 *
180 * The device to slot mapping looks like:
181 *
182 * Slot Device
183 * 7 Intel PCI-EISA bridge chip
184 * 8 DEC PCI-PCI bridge chip
185 * 11 PCI on board slot 0
186 * 12 PCI on board slot 1
187 * 13 PCI on board slot 2
188 *
189 *
190 * This two layered interrupt approach means that we allocate IRQ 16 and
191 * above for PCI interrupts. The IRQ relates to which bit the interrupt
192 * comes in on. This makes interrupt processing much easier.
193 */
194
195static int __init
196noritake_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
197{
198 static char irq_tab[15][5] __initdata = {
199 /*INT INTA INTB INTC INTD */
200 /* note: IDSELs 16, 17, and 25 are CORELLE only */
201 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* IdSel 16, QLOGIC */
202 { -1, -1, -1, -1, -1}, /* IdSel 17, S3 Trio64 */
203 { -1, -1, -1, -1, -1}, /* IdSel 18, PCEB */
204 { -1, -1, -1, -1, -1}, /* IdSel 19, PPB */
205 { -1, -1, -1, -1, -1}, /* IdSel 20, ???? */
206 { -1, -1, -1, -1, -1}, /* IdSel 21, ???? */
207 { 16+2, 16+2, 16+3, 32+2, 32+3}, /* IdSel 22, slot 0 */
208 { 16+4, 16+4, 16+5, 32+4, 32+5}, /* IdSel 23, slot 1 */
209 { 16+6, 16+6, 16+7, 32+6, 32+7}, /* IdSel 24, slot 2 */
210 { 16+8, 16+8, 16+9, 32+8, 32+9}, /* IdSel 25, slot 3 */
211 /* The following 5 are actually on PCI bus 1, which is
212 across the built-in bridge of the NORITAKE only. */
213 { 16+1, 16+1, 16+1, 16+1, 16+1}, /* IdSel 16, QLOGIC */
214 { 16+8, 16+8, 16+9, 32+8, 32+9}, /* IdSel 17, slot 3 */
215 {16+10, 16+10, 16+11, 32+10, 32+11}, /* IdSel 18, slot 4 */
216 {16+12, 16+12, 16+13, 32+12, 32+13}, /* IdSel 19, slot 5 */
217 {16+14, 16+14, 16+15, 32+14, 32+15}, /* IdSel 20, slot 6 */
218 };
219 const long min_idsel = 5, max_idsel = 19, irqs_per_slot = 5;
220 return COMMON_TABLE_LOOKUP;
221}
222
223static u8 __init
224noritake_swizzle(struct pci_dev *dev, u8 *pinp)
225{
226 int slot, pin = *pinp;
227
228 if (dev->bus->number == 0) {
229 slot = PCI_SLOT(dev->devfn);
230 }
231 /* Check for the built-in bridge */
232 else if (PCI_SLOT(dev->bus->self->devfn) == 8) {
233 slot = PCI_SLOT(dev->devfn) + 15; /* WAG! */
234 }
235 else
236 {
237 /* Must be a card-based bridge. */
238 do {
239 if (PCI_SLOT(dev->bus->self->devfn) == 8) {
240 slot = PCI_SLOT(dev->devfn) + 15;
241 break;
242 }
1be9baa0 243 pin = pci_swizzle_interrupt_pin(dev, pin);
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244
245 /* Move up the chain of bridges. */
246 dev = dev->bus->self;
247 /* Slot of the next bridge. */
248 slot = PCI_SLOT(dev->devfn);
249 } while (dev->bus->self);
250 }
251 *pinp = pin;
252 return slot;
253}
254
255#if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO)
256static void
4fa1970a 257noritake_apecs_machine_check(unsigned long vector, unsigned long la_ptr)
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258{
259#define MCHK_NO_DEVSEL 0x205U
260#define MCHK_NO_TABT 0x204U
261
262 struct el_common *mchk_header;
263 unsigned int code;
264
265 mchk_header = (struct el_common *)la_ptr;
266
267 /* Clear the error before any reporting. */
268 mb();
269 mb(); /* magic */
270 draina();
271 apecs_pci_clr_err();
272 wrmces(0x7);
273 mb();
274
275 code = mchk_header->code;
4fa1970a 276 process_mcheck_info(vector, la_ptr, "NORITAKE APECS",
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277 (mcheck_expected(0)
278 && (code == MCHK_NO_DEVSEL
279 || code == MCHK_NO_TABT)));
280}
281#endif
282
283
284/*
285 * The System Vectors
286 */
287
288#if defined(CONFIG_ALPHA_GENERIC) || !defined(CONFIG_ALPHA_PRIMO)
289struct alpha_machine_vector noritake_mv __initmv = {
290 .vector_name = "Noritake",
291 DO_EV4_MMU,
292 DO_DEFAULT_RTC,
293 DO_APECS_IO,
294 .machine_check = noritake_apecs_machine_check,
295 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
296 .min_io_address = EISA_DEFAULT_IO_BASE,
297 .min_mem_address = APECS_AND_LCA_DEFAULT_MEM_BASE,
298
299 .nr_irqs = 48,
300 .device_interrupt = noritake_device_interrupt,
301
302 .init_arch = apecs_init_arch,
303 .init_irq = noritake_init_irq,
304 .init_rtc = common_init_rtc,
305 .init_pci = common_init_pci,
306 .pci_map_irq = noritake_map_irq,
307 .pci_swizzle = noritake_swizzle,
308};
309ALIAS_MV(noritake)
310#endif
311
312#if defined(CONFIG_ALPHA_GENERIC) || defined(CONFIG_ALPHA_PRIMO)
313struct alpha_machine_vector noritake_primo_mv __initmv = {
314 .vector_name = "Noritake-Primo",
315 DO_EV5_MMU,
316 DO_DEFAULT_RTC,
317 DO_CIA_IO,
318 .machine_check = cia_machine_check,
319 .max_isa_dma_address = ALPHA_MAX_ISA_DMA_ADDRESS,
320 .min_io_address = EISA_DEFAULT_IO_BASE,
321 .min_mem_address = CIA_DEFAULT_MEM_BASE,
322
323 .nr_irqs = 48,
324 .device_interrupt = noritake_device_interrupt,
325
326 .init_arch = cia_init_arch,
327 .init_irq = noritake_init_irq,
328 .init_rtc = common_init_rtc,
329 .init_pci = cia_init_pci,
330 .kill_arch = cia_kill_arch,
331 .pci_map_irq = noritake_map_irq,
332 .pci_swizzle = noritake_swizzle,
333};
334ALIAS_MV(noritake_primo)
335#endif