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Commit | Line | Data |
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14cf11af PM |
1 | /* |
2 | * arch/powerpc/kernel/mpic.c | |
3 | * | |
4 | * Driver for interrupt controllers following the OpenPIC standard, the | |
5 | * common implementation beeing IBM's MPIC. This driver also can deal | |
6 | * with various broken implementations of this HW. | |
7 | * | |
8 | * Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp. | |
9 | * | |
10 | * This file is subject to the terms and conditions of the GNU General Public | |
11 | * License. See the file COPYING in the main directory of this archive | |
12 | * for more details. | |
13 | */ | |
14 | ||
15 | #undef DEBUG | |
1beb6a7d BH |
16 | #undef DEBUG_IPI |
17 | #undef DEBUG_IRQ | |
18 | #undef DEBUG_LOW | |
14cf11af | 19 | |
14cf11af PM |
20 | #include <linux/types.h> |
21 | #include <linux/kernel.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/irq.h> | |
24 | #include <linux/smp.h> | |
25 | #include <linux/interrupt.h> | |
26 | #include <linux/bootmem.h> | |
27 | #include <linux/spinlock.h> | |
28 | #include <linux/pci.h> | |
29 | ||
30 | #include <asm/ptrace.h> | |
31 | #include <asm/signal.h> | |
32 | #include <asm/io.h> | |
33 | #include <asm/pgtable.h> | |
34 | #include <asm/irq.h> | |
35 | #include <asm/machdep.h> | |
36 | #include <asm/mpic.h> | |
37 | #include <asm/smp.h> | |
38 | ||
39 | #ifdef DEBUG | |
40 | #define DBG(fmt...) printk(fmt) | |
41 | #else | |
42 | #define DBG(fmt...) | |
43 | #endif | |
44 | ||
45 | static struct mpic *mpics; | |
46 | static struct mpic *mpic_primary; | |
47 | static DEFINE_SPINLOCK(mpic_lock); | |
48 | ||
c0c0d996 | 49 | #ifdef CONFIG_PPC32 /* XXX for now */ |
e40c7f02 AW |
50 | #ifdef CONFIG_IRQ_ALL_CPUS |
51 | #define distribute_irqs (1) | |
52 | #else | |
53 | #define distribute_irqs (0) | |
54 | #endif | |
c0c0d996 | 55 | #endif |
14cf11af PM |
56 | |
57 | /* | |
58 | * Register accessor functions | |
59 | */ | |
60 | ||
61 | ||
62 | static inline u32 _mpic_read(unsigned int be, volatile u32 __iomem *base, | |
63 | unsigned int reg) | |
64 | { | |
65 | if (be) | |
66 | return in_be32(base + (reg >> 2)); | |
67 | else | |
68 | return in_le32(base + (reg >> 2)); | |
69 | } | |
70 | ||
71 | static inline void _mpic_write(unsigned int be, volatile u32 __iomem *base, | |
72 | unsigned int reg, u32 value) | |
73 | { | |
74 | if (be) | |
75 | out_be32(base + (reg >> 2), value); | |
76 | else | |
77 | out_le32(base + (reg >> 2), value); | |
78 | } | |
79 | ||
80 | static inline u32 _mpic_ipi_read(struct mpic *mpic, unsigned int ipi) | |
81 | { | |
82 | unsigned int be = (mpic->flags & MPIC_BIG_ENDIAN) != 0; | |
83 | unsigned int offset = MPIC_GREG_IPI_VECTOR_PRI_0 + (ipi * 0x10); | |
84 | ||
85 | if (mpic->flags & MPIC_BROKEN_IPI) | |
86 | be = !be; | |
87 | return _mpic_read(be, mpic->gregs, offset); | |
88 | } | |
89 | ||
90 | static inline void _mpic_ipi_write(struct mpic *mpic, unsigned int ipi, u32 value) | |
91 | { | |
92 | unsigned int offset = MPIC_GREG_IPI_VECTOR_PRI_0 + (ipi * 0x10); | |
93 | ||
94 | _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->gregs, offset, value); | |
95 | } | |
96 | ||
97 | static inline u32 _mpic_cpu_read(struct mpic *mpic, unsigned int reg) | |
98 | { | |
99 | unsigned int cpu = 0; | |
100 | ||
101 | if (mpic->flags & MPIC_PRIMARY) | |
102 | cpu = hard_smp_processor_id(); | |
b9e5b4e6 BH |
103 | return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN, |
104 | mpic->cpuregs[cpu], reg); | |
14cf11af PM |
105 | } |
106 | ||
107 | static inline void _mpic_cpu_write(struct mpic *mpic, unsigned int reg, u32 value) | |
108 | { | |
109 | unsigned int cpu = 0; | |
110 | ||
111 | if (mpic->flags & MPIC_PRIMARY) | |
112 | cpu = hard_smp_processor_id(); | |
113 | ||
114 | _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->cpuregs[cpu], reg, value); | |
115 | } | |
116 | ||
117 | static inline u32 _mpic_irq_read(struct mpic *mpic, unsigned int src_no, unsigned int reg) | |
118 | { | |
119 | unsigned int isu = src_no >> mpic->isu_shift; | |
120 | unsigned int idx = src_no & mpic->isu_mask; | |
121 | ||
122 | return _mpic_read(mpic->flags & MPIC_BIG_ENDIAN, mpic->isus[isu], | |
123 | reg + (idx * MPIC_IRQ_STRIDE)); | |
124 | } | |
125 | ||
126 | static inline void _mpic_irq_write(struct mpic *mpic, unsigned int src_no, | |
127 | unsigned int reg, u32 value) | |
128 | { | |
129 | unsigned int isu = src_no >> mpic->isu_shift; | |
130 | unsigned int idx = src_no & mpic->isu_mask; | |
131 | ||
132 | _mpic_write(mpic->flags & MPIC_BIG_ENDIAN, mpic->isus[isu], | |
133 | reg + (idx * MPIC_IRQ_STRIDE), value); | |
134 | } | |
135 | ||
136 | #define mpic_read(b,r) _mpic_read(mpic->flags & MPIC_BIG_ENDIAN,(b),(r)) | |
137 | #define mpic_write(b,r,v) _mpic_write(mpic->flags & MPIC_BIG_ENDIAN,(b),(r),(v)) | |
138 | #define mpic_ipi_read(i) _mpic_ipi_read(mpic,(i)) | |
139 | #define mpic_ipi_write(i,v) _mpic_ipi_write(mpic,(i),(v)) | |
140 | #define mpic_cpu_read(i) _mpic_cpu_read(mpic,(i)) | |
141 | #define mpic_cpu_write(i,v) _mpic_cpu_write(mpic,(i),(v)) | |
142 | #define mpic_irq_read(s,r) _mpic_irq_read(mpic,(s),(r)) | |
143 | #define mpic_irq_write(s,r,v) _mpic_irq_write(mpic,(s),(r),(v)) | |
144 | ||
145 | ||
146 | /* | |
147 | * Low level utility functions | |
148 | */ | |
149 | ||
150 | ||
151 | ||
152 | /* Check if we have one of those nice broken MPICs with a flipped endian on | |
153 | * reads from IPI registers | |
154 | */ | |
155 | static void __init mpic_test_broken_ipi(struct mpic *mpic) | |
156 | { | |
157 | u32 r; | |
158 | ||
159 | mpic_write(mpic->gregs, MPIC_GREG_IPI_VECTOR_PRI_0, MPIC_VECPRI_MASK); | |
160 | r = mpic_read(mpic->gregs, MPIC_GREG_IPI_VECTOR_PRI_0); | |
161 | ||
162 | if (r == le32_to_cpu(MPIC_VECPRI_MASK)) { | |
163 | printk(KERN_INFO "mpic: Detected reversed IPI registers\n"); | |
164 | mpic->flags |= MPIC_BROKEN_IPI; | |
165 | } | |
166 | } | |
167 | ||
168 | #ifdef CONFIG_MPIC_BROKEN_U3 | |
169 | ||
170 | /* Test if an interrupt is sourced from HyperTransport (used on broken U3s) | |
171 | * to force the edge setting on the MPIC and do the ack workaround. | |
172 | */ | |
1beb6a7d | 173 | static inline int mpic_is_ht_interrupt(struct mpic *mpic, unsigned int source) |
14cf11af | 174 | { |
1beb6a7d | 175 | if (source >= 128 || !mpic->fixups) |
14cf11af | 176 | return 0; |
1beb6a7d | 177 | return mpic->fixups[source].base != NULL; |
14cf11af PM |
178 | } |
179 | ||
c4b22f26 | 180 | |
1beb6a7d | 181 | static inline void mpic_ht_end_irq(struct mpic *mpic, unsigned int source) |
14cf11af | 182 | { |
1beb6a7d | 183 | struct mpic_irq_fixup *fixup = &mpic->fixups[source]; |
14cf11af | 184 | |
1beb6a7d BH |
185 | if (fixup->applebase) { |
186 | unsigned int soff = (fixup->index >> 3) & ~3; | |
187 | unsigned int mask = 1U << (fixup->index & 0x1f); | |
188 | writel(mask, fixup->applebase + soff); | |
189 | } else { | |
190 | spin_lock(&mpic->fixup_lock); | |
191 | writeb(0x11 + 2 * fixup->index, fixup->base + 2); | |
192 | writel(fixup->data, fixup->base + 4); | |
193 | spin_unlock(&mpic->fixup_lock); | |
194 | } | |
14cf11af PM |
195 | } |
196 | ||
1beb6a7d BH |
197 | static void mpic_startup_ht_interrupt(struct mpic *mpic, unsigned int source, |
198 | unsigned int irqflags) | |
199 | { | |
200 | struct mpic_irq_fixup *fixup = &mpic->fixups[source]; | |
201 | unsigned long flags; | |
202 | u32 tmp; | |
203 | ||
204 | if (fixup->base == NULL) | |
205 | return; | |
206 | ||
207 | DBG("startup_ht_interrupt(%u, %u) index: %d\n", | |
208 | source, irqflags, fixup->index); | |
209 | spin_lock_irqsave(&mpic->fixup_lock, flags); | |
210 | /* Enable and configure */ | |
211 | writeb(0x10 + 2 * fixup->index, fixup->base + 2); | |
212 | tmp = readl(fixup->base + 4); | |
213 | tmp &= ~(0x23U); | |
214 | if (irqflags & IRQ_LEVEL) | |
215 | tmp |= 0x22; | |
216 | writel(tmp, fixup->base + 4); | |
217 | spin_unlock_irqrestore(&mpic->fixup_lock, flags); | |
218 | } | |
219 | ||
220 | static void mpic_shutdown_ht_interrupt(struct mpic *mpic, unsigned int source, | |
221 | unsigned int irqflags) | |
222 | { | |
223 | struct mpic_irq_fixup *fixup = &mpic->fixups[source]; | |
224 | unsigned long flags; | |
225 | u32 tmp; | |
226 | ||
227 | if (fixup->base == NULL) | |
228 | return; | |
229 | ||
230 | DBG("shutdown_ht_interrupt(%u, %u)\n", source, irqflags); | |
231 | ||
232 | /* Disable */ | |
233 | spin_lock_irqsave(&mpic->fixup_lock, flags); | |
234 | writeb(0x10 + 2 * fixup->index, fixup->base + 2); | |
235 | tmp = readl(fixup->base + 4); | |
72b13819 | 236 | tmp |= 1; |
1beb6a7d BH |
237 | writel(tmp, fixup->base + 4); |
238 | spin_unlock_irqrestore(&mpic->fixup_lock, flags); | |
239 | } | |
14cf11af | 240 | |
1beb6a7d BH |
241 | static void __init mpic_scan_ht_pic(struct mpic *mpic, u8 __iomem *devbase, |
242 | unsigned int devfn, u32 vdid) | |
14cf11af | 243 | { |
c4b22f26 | 244 | int i, irq, n; |
1beb6a7d | 245 | u8 __iomem *base; |
14cf11af | 246 | u32 tmp; |
c4b22f26 | 247 | u8 pos; |
14cf11af | 248 | |
1beb6a7d BH |
249 | for (pos = readb(devbase + PCI_CAPABILITY_LIST); pos != 0; |
250 | pos = readb(devbase + pos + PCI_CAP_LIST_NEXT)) { | |
251 | u8 id = readb(devbase + pos + PCI_CAP_LIST_ID); | |
252 | if (id == PCI_CAP_ID_HT_IRQCONF) { | |
c4b22f26 SB |
253 | id = readb(devbase + pos + 3); |
254 | if (id == 0x80) | |
255 | break; | |
256 | } | |
14cf11af | 257 | } |
c4b22f26 SB |
258 | if (pos == 0) |
259 | return; | |
260 | ||
1beb6a7d BH |
261 | base = devbase + pos; |
262 | writeb(0x01, base + 2); | |
263 | n = (readl(base + 4) >> 16) & 0xff; | |
14cf11af | 264 | |
1beb6a7d BH |
265 | printk(KERN_INFO "mpic: - HT:%02x.%x [0x%02x] vendor %04x device %04x" |
266 | " has %d irqs\n", | |
267 | devfn >> 3, devfn & 0x7, pos, vdid & 0xffff, vdid >> 16, n + 1); | |
c4b22f26 SB |
268 | |
269 | for (i = 0; i <= n; i++) { | |
1beb6a7d BH |
270 | writeb(0x10 + 2 * i, base + 2); |
271 | tmp = readl(base + 4); | |
14cf11af | 272 | irq = (tmp >> 16) & 0xff; |
1beb6a7d BH |
273 | DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i, irq, tmp); |
274 | /* mask it , will be unmasked later */ | |
275 | tmp |= 0x1; | |
276 | writel(tmp, base + 4); | |
277 | mpic->fixups[irq].index = i; | |
278 | mpic->fixups[irq].base = base; | |
279 | /* Apple HT PIC has a non-standard way of doing EOIs */ | |
280 | if ((vdid & 0xffff) == 0x106b) | |
281 | mpic->fixups[irq].applebase = devbase + 0x60; | |
282 | else | |
283 | mpic->fixups[irq].applebase = NULL; | |
284 | writeb(0x11 + 2 * i, base + 2); | |
285 | mpic->fixups[irq].data = readl(base + 4) | 0x80000000; | |
14cf11af PM |
286 | } |
287 | } | |
288 | ||
c4b22f26 | 289 | |
1beb6a7d | 290 | static void __init mpic_scan_ht_pics(struct mpic *mpic) |
14cf11af PM |
291 | { |
292 | unsigned int devfn; | |
293 | u8 __iomem *cfgspace; | |
294 | ||
1beb6a7d | 295 | printk(KERN_INFO "mpic: Setting up HT PICs workarounds for U3/U4\n"); |
14cf11af PM |
296 | |
297 | /* Allocate fixups array */ | |
298 | mpic->fixups = alloc_bootmem(128 * sizeof(struct mpic_irq_fixup)); | |
299 | BUG_ON(mpic->fixups == NULL); | |
300 | memset(mpic->fixups, 0, 128 * sizeof(struct mpic_irq_fixup)); | |
301 | ||
302 | /* Init spinlock */ | |
303 | spin_lock_init(&mpic->fixup_lock); | |
304 | ||
c4b22f26 SB |
305 | /* Map U3 config space. We assume all IO-APICs are on the primary bus |
306 | * so we only need to map 64kB. | |
14cf11af | 307 | */ |
c4b22f26 | 308 | cfgspace = ioremap(0xf2000000, 0x10000); |
14cf11af PM |
309 | BUG_ON(cfgspace == NULL); |
310 | ||
1beb6a7d BH |
311 | /* Now we scan all slots. We do a very quick scan, we read the header |
312 | * type, vendor ID and device ID only, that's plenty enough | |
14cf11af | 313 | */ |
c4b22f26 | 314 | for (devfn = 0; devfn < 0x100; devfn++) { |
14cf11af PM |
315 | u8 __iomem *devbase = cfgspace + (devfn << 8); |
316 | u8 hdr_type = readb(devbase + PCI_HEADER_TYPE); | |
317 | u32 l = readl(devbase + PCI_VENDOR_ID); | |
1beb6a7d | 318 | u16 s; |
14cf11af PM |
319 | |
320 | DBG("devfn %x, l: %x\n", devfn, l); | |
321 | ||
322 | /* If no device, skip */ | |
323 | if (l == 0xffffffff || l == 0x00000000 || | |
324 | l == 0x0000ffff || l == 0xffff0000) | |
325 | goto next; | |
1beb6a7d BH |
326 | /* Check if is supports capability lists */ |
327 | s = readw(devbase + PCI_STATUS); | |
328 | if (!(s & PCI_STATUS_CAP_LIST)) | |
329 | goto next; | |
14cf11af | 330 | |
1beb6a7d | 331 | mpic_scan_ht_pic(mpic, devbase, devfn, l); |
c4b22f26 | 332 | |
14cf11af PM |
333 | next: |
334 | /* next device, if function 0 */ | |
c4b22f26 | 335 | if (PCI_FUNC(devfn) == 0 && (hdr_type & 0x80) == 0) |
14cf11af PM |
336 | devfn += 7; |
337 | } | |
338 | } | |
339 | ||
340 | #endif /* CONFIG_MPIC_BROKEN_U3 */ | |
341 | ||
342 | ||
0ebfff14 BH |
343 | #define mpic_irq_to_hw(virq) ((unsigned int)irq_map[virq].hwirq) |
344 | ||
14cf11af PM |
345 | /* Find an mpic associated with a given linux interrupt */ |
346 | static struct mpic *mpic_find(unsigned int irq, unsigned int *is_ipi) | |
347 | { | |
0ebfff14 BH |
348 | unsigned int src = mpic_irq_to_hw(irq); |
349 | ||
350 | if (irq < NUM_ISA_INTERRUPTS) | |
351 | return NULL; | |
352 | if (is_ipi) | |
353 | *is_ipi = (src >= MPIC_VEC_IPI_0 && src <= MPIC_VEC_IPI_3); | |
354 | ||
355 | return irq_desc[irq].chip_data; | |
14cf11af PM |
356 | } |
357 | ||
358 | /* Convert a cpu mask from logical to physical cpu numbers. */ | |
359 | static inline u32 mpic_physmask(u32 cpumask) | |
360 | { | |
361 | int i; | |
362 | u32 mask = 0; | |
363 | ||
364 | for (i = 0; i < NR_CPUS; ++i, cpumask >>= 1) | |
365 | mask |= (cpumask & 1) << get_hard_smp_processor_id(i); | |
366 | return mask; | |
367 | } | |
368 | ||
369 | #ifdef CONFIG_SMP | |
370 | /* Get the mpic structure from the IPI number */ | |
371 | static inline struct mpic * mpic_from_ipi(unsigned int ipi) | |
372 | { | |
b9e5b4e6 | 373 | return irq_desc[ipi].chip_data; |
14cf11af PM |
374 | } |
375 | #endif | |
376 | ||
377 | /* Get the mpic structure from the irq number */ | |
378 | static inline struct mpic * mpic_from_irq(unsigned int irq) | |
379 | { | |
b9e5b4e6 | 380 | return irq_desc[irq].chip_data; |
14cf11af PM |
381 | } |
382 | ||
383 | /* Send an EOI */ | |
384 | static inline void mpic_eoi(struct mpic *mpic) | |
385 | { | |
386 | mpic_cpu_write(MPIC_CPU_EOI, 0); | |
387 | (void)mpic_cpu_read(MPIC_CPU_WHOAMI); | |
388 | } | |
389 | ||
390 | #ifdef CONFIG_SMP | |
391 | static irqreturn_t mpic_ipi_action(int irq, void *dev_id, struct pt_regs *regs) | |
392 | { | |
0ebfff14 | 393 | smp_message_recv(mpic_irq_to_hw(irq) - MPIC_VEC_IPI_0, regs); |
14cf11af PM |
394 | return IRQ_HANDLED; |
395 | } | |
396 | #endif /* CONFIG_SMP */ | |
397 | ||
398 | /* | |
399 | * Linux descriptor level callbacks | |
400 | */ | |
401 | ||
402 | ||
b9e5b4e6 | 403 | static void mpic_unmask_irq(unsigned int irq) |
14cf11af PM |
404 | { |
405 | unsigned int loops = 100000; | |
406 | struct mpic *mpic = mpic_from_irq(irq); | |
0ebfff14 | 407 | unsigned int src = mpic_irq_to_hw(irq); |
ba1826e5 | 408 | unsigned long flags; |
14cf11af | 409 | |
bd561c79 | 410 | DBG("%p: %s: enable_irq: %d (src %d)\n", mpic, mpic->name, irq, src); |
14cf11af | 411 | |
ba1826e5 | 412 | spin_lock_irqsave(&mpic_lock, flags); |
14cf11af | 413 | mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI, |
e5356640 BH |
414 | mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & |
415 | ~MPIC_VECPRI_MASK); | |
14cf11af PM |
416 | /* make sure mask gets to controller before we return to user */ |
417 | do { | |
418 | if (!loops--) { | |
419 | printk(KERN_ERR "mpic_enable_irq timeout\n"); | |
420 | break; | |
421 | } | |
ba1826e5 BH |
422 | } while(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK); |
423 | spin_unlock_irqrestore(&mpic_lock, flags); | |
14cf11af PM |
424 | } |
425 | ||
b9e5b4e6 | 426 | static void mpic_mask_irq(unsigned int irq) |
14cf11af PM |
427 | { |
428 | unsigned int loops = 100000; | |
429 | struct mpic *mpic = mpic_from_irq(irq); | |
0ebfff14 | 430 | unsigned int src = mpic_irq_to_hw(irq); |
ba1826e5 | 431 | unsigned long flags; |
14cf11af PM |
432 | |
433 | DBG("%s: disable_irq: %d (src %d)\n", mpic->name, irq, src); | |
434 | ||
ba1826e5 | 435 | spin_lock_irqsave(&mpic_lock, flags); |
14cf11af | 436 | mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI, |
e5356640 BH |
437 | mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) | |
438 | MPIC_VECPRI_MASK); | |
14cf11af PM |
439 | |
440 | /* make sure mask gets to controller before we return to user */ | |
441 | do { | |
442 | if (!loops--) { | |
443 | printk(KERN_ERR "mpic_enable_irq timeout\n"); | |
444 | break; | |
445 | } | |
446 | } while(!(mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) & MPIC_VECPRI_MASK)); | |
ba1826e5 | 447 | spin_unlock_irqrestore(&mpic_lock, flags); |
14cf11af PM |
448 | } |
449 | ||
b9e5b4e6 | 450 | static void mpic_end_irq(unsigned int irq) |
1beb6a7d | 451 | { |
b9e5b4e6 BH |
452 | struct mpic *mpic = mpic_from_irq(irq); |
453 | ||
454 | #ifdef DEBUG_IRQ | |
455 | DBG("%s: end_irq: %d\n", mpic->name, irq); | |
456 | #endif | |
457 | /* We always EOI on end_irq() even for edge interrupts since that | |
458 | * should only lower the priority, the MPIC should have properly | |
459 | * latched another edge interrupt coming in anyway | |
460 | */ | |
461 | ||
462 | mpic_eoi(mpic); | |
463 | } | |
464 | ||
1beb6a7d | 465 | #ifdef CONFIG_MPIC_BROKEN_U3 |
b9e5b4e6 BH |
466 | |
467 | static void mpic_unmask_ht_irq(unsigned int irq) | |
468 | { | |
1beb6a7d | 469 | struct mpic *mpic = mpic_from_irq(irq); |
0ebfff14 | 470 | unsigned int src = mpic_irq_to_hw(irq); |
1beb6a7d | 471 | |
b9e5b4e6 | 472 | mpic_unmask_irq(irq); |
1beb6a7d | 473 | |
b9e5b4e6 BH |
474 | if (irq_desc[irq].status & IRQ_LEVEL) |
475 | mpic_ht_end_irq(mpic, src); | |
476 | } | |
477 | ||
478 | static unsigned int mpic_startup_ht_irq(unsigned int irq) | |
479 | { | |
480 | struct mpic *mpic = mpic_from_irq(irq); | |
0ebfff14 | 481 | unsigned int src = mpic_irq_to_hw(irq); |
1beb6a7d | 482 | |
b9e5b4e6 BH |
483 | mpic_unmask_irq(irq); |
484 | mpic_startup_ht_interrupt(mpic, src, irq_desc[irq].status); | |
485 | ||
486 | return 0; | |
1beb6a7d BH |
487 | } |
488 | ||
b9e5b4e6 BH |
489 | static void mpic_shutdown_ht_irq(unsigned int irq) |
490 | { | |
491 | struct mpic *mpic = mpic_from_irq(irq); | |
0ebfff14 | 492 | unsigned int src = mpic_irq_to_hw(irq); |
b9e5b4e6 BH |
493 | |
494 | mpic_shutdown_ht_interrupt(mpic, src, irq_desc[irq].status); | |
495 | mpic_mask_irq(irq); | |
496 | } | |
497 | ||
498 | static void mpic_end_ht_irq(unsigned int irq) | |
14cf11af PM |
499 | { |
500 | struct mpic *mpic = mpic_from_irq(irq); | |
0ebfff14 | 501 | unsigned int src = mpic_irq_to_hw(irq); |
14cf11af | 502 | |
1beb6a7d | 503 | #ifdef DEBUG_IRQ |
14cf11af | 504 | DBG("%s: end_irq: %d\n", mpic->name, irq); |
1beb6a7d | 505 | #endif |
14cf11af PM |
506 | /* We always EOI on end_irq() even for edge interrupts since that |
507 | * should only lower the priority, the MPIC should have properly | |
508 | * latched another edge interrupt coming in anyway | |
509 | */ | |
510 | ||
b9e5b4e6 BH |
511 | if (irq_desc[irq].status & IRQ_LEVEL) |
512 | mpic_ht_end_irq(mpic, src); | |
14cf11af PM |
513 | mpic_eoi(mpic); |
514 | } | |
515 | ||
b9e5b4e6 BH |
516 | #endif /* CONFIG_MPIC_BROKEN_U3 */ |
517 | ||
14cf11af PM |
518 | #ifdef CONFIG_SMP |
519 | ||
b9e5b4e6 | 520 | static void mpic_unmask_ipi(unsigned int irq) |
14cf11af PM |
521 | { |
522 | struct mpic *mpic = mpic_from_ipi(irq); | |
0ebfff14 | 523 | unsigned int src = mpic_irq_to_hw(irq) - MPIC_VEC_IPI_0; |
14cf11af PM |
524 | |
525 | DBG("%s: enable_ipi: %d (ipi %d)\n", mpic->name, irq, src); | |
526 | mpic_ipi_write(src, mpic_ipi_read(src) & ~MPIC_VECPRI_MASK); | |
527 | } | |
528 | ||
b9e5b4e6 | 529 | static void mpic_mask_ipi(unsigned int irq) |
14cf11af PM |
530 | { |
531 | /* NEVER disable an IPI... that's just plain wrong! */ | |
532 | } | |
533 | ||
534 | static void mpic_end_ipi(unsigned int irq) | |
535 | { | |
536 | struct mpic *mpic = mpic_from_ipi(irq); | |
537 | ||
538 | /* | |
539 | * IPIs are marked IRQ_PER_CPU. This has the side effect of | |
540 | * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from | |
541 | * applying to them. We EOI them late to avoid re-entering. | |
6714465e | 542 | * We mark IPI's with IRQF_DISABLED as they must run with |
14cf11af PM |
543 | * irqs disabled. |
544 | */ | |
545 | mpic_eoi(mpic); | |
546 | } | |
547 | ||
548 | #endif /* CONFIG_SMP */ | |
549 | ||
550 | static void mpic_set_affinity(unsigned int irq, cpumask_t cpumask) | |
551 | { | |
552 | struct mpic *mpic = mpic_from_irq(irq); | |
0ebfff14 | 553 | unsigned int src = mpic_irq_to_hw(irq); |
14cf11af PM |
554 | |
555 | cpumask_t tmp; | |
556 | ||
557 | cpus_and(tmp, cpumask, cpu_online_map); | |
558 | ||
0ebfff14 | 559 | mpic_irq_write(src, MPIC_IRQ_DESTINATION, |
14cf11af PM |
560 | mpic_physmask(cpus_addr(tmp)[0])); |
561 | } | |
562 | ||
0ebfff14 BH |
563 | static unsigned int mpic_flags_to_vecpri(unsigned int flags, int *level) |
564 | { | |
565 | unsigned int vecpri; | |
566 | ||
567 | /* Now convert sense value */ | |
568 | switch(flags & IRQ_TYPE_SENSE_MASK) { | |
569 | case IRQ_TYPE_EDGE_RISING: | |
570 | vecpri = MPIC_VECPRI_SENSE_EDGE | | |
571 | MPIC_VECPRI_POLARITY_POSITIVE; | |
572 | *level = 0; | |
573 | break; | |
574 | case IRQ_TYPE_EDGE_FALLING: | |
575 | vecpri = MPIC_VECPRI_SENSE_EDGE | | |
576 | MPIC_VECPRI_POLARITY_NEGATIVE; | |
577 | *level = 0; | |
578 | break; | |
579 | case IRQ_TYPE_LEVEL_HIGH: | |
580 | vecpri = MPIC_VECPRI_SENSE_LEVEL | | |
581 | MPIC_VECPRI_POLARITY_POSITIVE; | |
582 | *level = 1; | |
583 | break; | |
584 | case IRQ_TYPE_LEVEL_LOW: | |
585 | default: | |
586 | vecpri = MPIC_VECPRI_SENSE_LEVEL | | |
587 | MPIC_VECPRI_POLARITY_NEGATIVE; | |
588 | *level = 1; | |
589 | } | |
590 | return vecpri; | |
591 | } | |
592 | ||
b9e5b4e6 BH |
593 | static struct irq_chip mpic_irq_chip = { |
594 | .mask = mpic_mask_irq, | |
595 | .unmask = mpic_unmask_irq, | |
596 | .eoi = mpic_end_irq, | |
597 | }; | |
598 | ||
599 | #ifdef CONFIG_SMP | |
600 | static struct irq_chip mpic_ipi_chip = { | |
601 | .mask = mpic_mask_ipi, | |
602 | .unmask = mpic_unmask_ipi, | |
603 | .eoi = mpic_end_ipi, | |
604 | }; | |
605 | #endif /* CONFIG_SMP */ | |
606 | ||
607 | #ifdef CONFIG_MPIC_BROKEN_U3 | |
608 | static struct irq_chip mpic_irq_ht_chip = { | |
609 | .startup = mpic_startup_ht_irq, | |
610 | .shutdown = mpic_shutdown_ht_irq, | |
611 | .mask = mpic_mask_irq, | |
612 | .unmask = mpic_unmask_ht_irq, | |
613 | .eoi = mpic_end_ht_irq, | |
614 | }; | |
615 | #endif /* CONFIG_MPIC_BROKEN_U3 */ | |
616 | ||
14cf11af | 617 | |
0ebfff14 BH |
618 | static int mpic_host_match(struct irq_host *h, struct device_node *node) |
619 | { | |
620 | struct mpic *mpic = h->host_data; | |
621 | ||
622 | /* Exact match, unless mpic node is NULL */ | |
623 | return mpic->of_node == NULL || mpic->of_node == node; | |
624 | } | |
625 | ||
626 | static int mpic_host_map(struct irq_host *h, unsigned int virq, | |
627 | irq_hw_number_t hw, unsigned int flags) | |
628 | { | |
629 | struct irq_desc *desc = get_irq_desc(virq); | |
630 | struct irq_chip *chip; | |
631 | struct mpic *mpic = h->host_data; | |
ba1826e5 | 632 | u32 v, vecpri = MPIC_VECPRI_SENSE_LEVEL | |
0ebfff14 BH |
633 | MPIC_VECPRI_POLARITY_NEGATIVE; |
634 | int level; | |
ba1826e5 | 635 | unsigned long iflags; |
0ebfff14 BH |
636 | |
637 | pr_debug("mpic: map virq %d, hwirq 0x%lx, flags: 0x%x\n", | |
638 | virq, hw, flags); | |
639 | ||
640 | if (hw == MPIC_VEC_SPURRIOUS) | |
641 | return -EINVAL; | |
642 | #ifdef CONFIG_SMP | |
643 | else if (hw >= MPIC_VEC_IPI_0) { | |
644 | WARN_ON(!(mpic->flags & MPIC_PRIMARY)); | |
645 | ||
646 | pr_debug("mpic: mapping as IPI\n"); | |
647 | set_irq_chip_data(virq, mpic); | |
648 | set_irq_chip_and_handler(virq, &mpic->hc_ipi, | |
649 | handle_percpu_irq); | |
650 | return 0; | |
651 | } | |
652 | #endif /* CONFIG_SMP */ | |
653 | ||
654 | if (hw >= mpic->irq_count) | |
655 | return -EINVAL; | |
656 | ||
657 | /* If no sense provided, check default sense array */ | |
658 | if (((flags & IRQ_TYPE_SENSE_MASK) == IRQ_TYPE_NONE) && | |
659 | mpic->senses && hw < mpic->senses_count) | |
660 | flags |= mpic->senses[hw]; | |
661 | ||
662 | vecpri = mpic_flags_to_vecpri(flags, &level); | |
663 | if (level) | |
664 | desc->status |= IRQ_LEVEL; | |
665 | chip = &mpic->hc_irq; | |
666 | ||
667 | #ifdef CONFIG_MPIC_BROKEN_U3 | |
668 | /* Check for HT interrupts, override vecpri */ | |
669 | if (mpic_is_ht_interrupt(mpic, hw)) { | |
670 | vecpri &= ~(MPIC_VECPRI_SENSE_MASK | | |
671 | MPIC_VECPRI_POLARITY_MASK); | |
672 | vecpri |= MPIC_VECPRI_POLARITY_POSITIVE; | |
673 | chip = &mpic->hc_ht_irq; | |
674 | } | |
675 | #endif | |
676 | ||
ba1826e5 BH |
677 | /* Reconfigure irq. We must preserve the mask bit as we can be called |
678 | * while the interrupt is still active (This may change in the future | |
679 | * but for now, it is the case). | |
680 | */ | |
681 | spin_lock_irqsave(&mpic_lock, iflags); | |
682 | v = mpic_irq_read(hw, MPIC_IRQ_VECTOR_PRI); | |
683 | vecpri = (v & | |
684 | ~(MPIC_VECPRI_POLARITY_MASK | MPIC_VECPRI_SENSE_MASK)) | | |
685 | vecpri; | |
686 | if (vecpri != v) | |
687 | mpic_irq_write(hw, MPIC_IRQ_VECTOR_PRI, vecpri); | |
688 | spin_unlock_irqrestore(&mpic_lock, iflags); | |
689 | ||
690 | pr_debug("mpic: mapping as IRQ, vecpri = 0x%08x (was 0x%08x)\n", | |
691 | vecpri, v); | |
0ebfff14 BH |
692 | |
693 | set_irq_chip_data(virq, mpic); | |
694 | set_irq_chip_and_handler(virq, chip, handle_fasteoi_irq); | |
695 | return 0; | |
696 | } | |
697 | ||
698 | static int mpic_host_xlate(struct irq_host *h, struct device_node *ct, | |
699 | u32 *intspec, unsigned int intsize, | |
700 | irq_hw_number_t *out_hwirq, unsigned int *out_flags) | |
701 | ||
702 | { | |
703 | static unsigned char map_mpic_senses[4] = { | |
704 | IRQ_TYPE_EDGE_RISING, | |
705 | IRQ_TYPE_LEVEL_LOW, | |
706 | IRQ_TYPE_LEVEL_HIGH, | |
707 | IRQ_TYPE_EDGE_FALLING, | |
708 | }; | |
709 | ||
710 | *out_hwirq = intspec[0]; | |
711 | if (intsize > 1 && intspec[1] < 4) | |
712 | *out_flags = map_mpic_senses[intspec[1]]; | |
713 | else | |
714 | *out_flags = IRQ_TYPE_NONE; | |
715 | ||
716 | return 0; | |
717 | } | |
718 | ||
719 | static struct irq_host_ops mpic_host_ops = { | |
720 | .match = mpic_host_match, | |
721 | .map = mpic_host_map, | |
722 | .xlate = mpic_host_xlate, | |
723 | }; | |
724 | ||
14cf11af PM |
725 | /* |
726 | * Exported functions | |
727 | */ | |
728 | ||
0ebfff14 BH |
729 | struct mpic * __init mpic_alloc(struct device_node *node, |
730 | unsigned long phys_addr, | |
14cf11af PM |
731 | unsigned int flags, |
732 | unsigned int isu_size, | |
14cf11af | 733 | unsigned int irq_count, |
14cf11af PM |
734 | const char *name) |
735 | { | |
736 | struct mpic *mpic; | |
737 | u32 reg; | |
738 | const char *vers; | |
739 | int i; | |
740 | ||
741 | mpic = alloc_bootmem(sizeof(struct mpic)); | |
742 | if (mpic == NULL) | |
743 | return NULL; | |
744 | ||
14cf11af PM |
745 | memset(mpic, 0, sizeof(struct mpic)); |
746 | mpic->name = name; | |
0ebfff14 | 747 | mpic->of_node = node ? of_node_get(node) : NULL; |
14cf11af | 748 | |
0ebfff14 BH |
749 | mpic->irqhost = irq_alloc_host(IRQ_HOST_MAP_LINEAR, 256, |
750 | &mpic_host_ops, | |
751 | MPIC_VEC_SPURRIOUS); | |
752 | if (mpic->irqhost == NULL) { | |
753 | of_node_put(node); | |
754 | return NULL; | |
755 | } | |
756 | ||
757 | mpic->irqhost->host_data = mpic; | |
b9e5b4e6 | 758 | mpic->hc_irq = mpic_irq_chip; |
14cf11af | 759 | mpic->hc_irq.typename = name; |
14cf11af PM |
760 | if (flags & MPIC_PRIMARY) |
761 | mpic->hc_irq.set_affinity = mpic_set_affinity; | |
b9e5b4e6 BH |
762 | #ifdef CONFIG_MPIC_BROKEN_U3 |
763 | mpic->hc_ht_irq = mpic_irq_ht_chip; | |
764 | mpic->hc_ht_irq.typename = name; | |
765 | if (flags & MPIC_PRIMARY) | |
766 | mpic->hc_ht_irq.set_affinity = mpic_set_affinity; | |
767 | #endif /* CONFIG_MPIC_BROKEN_U3 */ | |
14cf11af | 768 | #ifdef CONFIG_SMP |
b9e5b4e6 | 769 | mpic->hc_ipi = mpic_ipi_chip; |
0ebfff14 | 770 | mpic->hc_ipi.typename = name; |
14cf11af PM |
771 | #endif /* CONFIG_SMP */ |
772 | ||
773 | mpic->flags = flags; | |
774 | mpic->isu_size = isu_size; | |
14cf11af | 775 | mpic->irq_count = irq_count; |
14cf11af | 776 | mpic->num_sources = 0; /* so far */ |
14cf11af PM |
777 | |
778 | /* Map the global registers */ | |
779 | mpic->gregs = ioremap(phys_addr + MPIC_GREG_BASE, 0x1000); | |
bd561c79 | 780 | mpic->tmregs = mpic->gregs + ((MPIC_TIMER_BASE - MPIC_GREG_BASE) >> 2); |
14cf11af PM |
781 | BUG_ON(mpic->gregs == NULL); |
782 | ||
783 | /* Reset */ | |
784 | if (flags & MPIC_WANTS_RESET) { | |
785 | mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0, | |
786 | mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0) | |
787 | | MPIC_GREG_GCONF_RESET); | |
788 | while( mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0) | |
789 | & MPIC_GREG_GCONF_RESET) | |
790 | mb(); | |
791 | } | |
792 | ||
793 | /* Read feature register, calculate num CPUs and, for non-ISU | |
794 | * MPICs, num sources as well. On ISU MPICs, sources are counted | |
795 | * as ISUs are added | |
796 | */ | |
797 | reg = mpic_read(mpic->gregs, MPIC_GREG_FEATURE_0); | |
798 | mpic->num_cpus = ((reg & MPIC_GREG_FEATURE_LAST_CPU_MASK) | |
799 | >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT) + 1; | |
800 | if (isu_size == 0) | |
801 | mpic->num_sources = ((reg & MPIC_GREG_FEATURE_LAST_SRC_MASK) | |
802 | >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT) + 1; | |
803 | ||
804 | /* Map the per-CPU registers */ | |
805 | for (i = 0; i < mpic->num_cpus; i++) { | |
806 | mpic->cpuregs[i] = ioremap(phys_addr + MPIC_CPU_BASE + | |
807 | i * MPIC_CPU_STRIDE, 0x1000); | |
808 | BUG_ON(mpic->cpuregs[i] == NULL); | |
809 | } | |
810 | ||
811 | /* Initialize main ISU if none provided */ | |
812 | if (mpic->isu_size == 0) { | |
813 | mpic->isu_size = mpic->num_sources; | |
814 | mpic->isus[0] = ioremap(phys_addr + MPIC_IRQ_BASE, | |
815 | MPIC_IRQ_STRIDE * mpic->isu_size); | |
816 | BUG_ON(mpic->isus[0] == NULL); | |
817 | } | |
818 | mpic->isu_shift = 1 + __ilog2(mpic->isu_size - 1); | |
819 | mpic->isu_mask = (1 << mpic->isu_shift) - 1; | |
820 | ||
821 | /* Display version */ | |
822 | switch (reg & MPIC_GREG_FEATURE_VERSION_MASK) { | |
823 | case 1: | |
824 | vers = "1.0"; | |
825 | break; | |
826 | case 2: | |
827 | vers = "1.2"; | |
828 | break; | |
829 | case 3: | |
830 | vers = "1.3"; | |
831 | break; | |
832 | default: | |
833 | vers = "<unknown>"; | |
834 | break; | |
835 | } | |
836 | printk(KERN_INFO "mpic: Setting up MPIC \"%s\" version %s at %lx, max %d CPUs\n", | |
837 | name, vers, phys_addr, mpic->num_cpus); | |
838 | printk(KERN_INFO "mpic: ISU size: %d, shift: %d, mask: %x\n", mpic->isu_size, | |
839 | mpic->isu_shift, mpic->isu_mask); | |
840 | ||
841 | mpic->next = mpics; | |
842 | mpics = mpic; | |
843 | ||
0ebfff14 | 844 | if (flags & MPIC_PRIMARY) { |
14cf11af | 845 | mpic_primary = mpic; |
0ebfff14 BH |
846 | irq_set_default_host(mpic->irqhost); |
847 | } | |
14cf11af PM |
848 | |
849 | return mpic; | |
850 | } | |
851 | ||
852 | void __init mpic_assign_isu(struct mpic *mpic, unsigned int isu_num, | |
853 | unsigned long phys_addr) | |
854 | { | |
855 | unsigned int isu_first = isu_num * mpic->isu_size; | |
856 | ||
857 | BUG_ON(isu_num >= MPIC_MAX_ISU); | |
858 | ||
859 | mpic->isus[isu_num] = ioremap(phys_addr, MPIC_IRQ_STRIDE * mpic->isu_size); | |
860 | if ((isu_first + mpic->isu_size) > mpic->num_sources) | |
861 | mpic->num_sources = isu_first + mpic->isu_size; | |
862 | } | |
863 | ||
0ebfff14 BH |
864 | void __init mpic_set_default_senses(struct mpic *mpic, u8 *senses, int count) |
865 | { | |
866 | mpic->senses = senses; | |
867 | mpic->senses_count = count; | |
868 | } | |
869 | ||
14cf11af PM |
870 | void __init mpic_init(struct mpic *mpic) |
871 | { | |
872 | int i; | |
873 | ||
874 | BUG_ON(mpic->num_sources == 0); | |
0ebfff14 BH |
875 | WARN_ON(mpic->num_sources > MPIC_VEC_IPI_0); |
876 | ||
877 | /* Sanitize source count */ | |
878 | if (mpic->num_sources > MPIC_VEC_IPI_0) | |
879 | mpic->num_sources = MPIC_VEC_IPI_0; | |
14cf11af PM |
880 | |
881 | printk(KERN_INFO "mpic: Initializing for %d sources\n", mpic->num_sources); | |
882 | ||
883 | /* Set current processor priority to max */ | |
884 | mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0xf); | |
885 | ||
886 | /* Initialize timers: just disable them all */ | |
887 | for (i = 0; i < 4; i++) { | |
888 | mpic_write(mpic->tmregs, | |
889 | i * MPIC_TIMER_STRIDE + MPIC_TIMER_DESTINATION, 0); | |
890 | mpic_write(mpic->tmregs, | |
891 | i * MPIC_TIMER_STRIDE + MPIC_TIMER_VECTOR_PRI, | |
892 | MPIC_VECPRI_MASK | | |
893 | (MPIC_VEC_TIMER_0 + i)); | |
894 | } | |
895 | ||
896 | /* Initialize IPIs to our reserved vectors and mark them disabled for now */ | |
897 | mpic_test_broken_ipi(mpic); | |
898 | for (i = 0; i < 4; i++) { | |
899 | mpic_ipi_write(i, | |
900 | MPIC_VECPRI_MASK | | |
901 | (10 << MPIC_VECPRI_PRIORITY_SHIFT) | | |
902 | (MPIC_VEC_IPI_0 + i)); | |
14cf11af PM |
903 | } |
904 | ||
905 | /* Initialize interrupt sources */ | |
906 | if (mpic->irq_count == 0) | |
907 | mpic->irq_count = mpic->num_sources; | |
908 | ||
909 | #ifdef CONFIG_MPIC_BROKEN_U3 | |
1beb6a7d | 910 | /* Do the HT PIC fixups on U3 broken mpic */ |
14cf11af PM |
911 | DBG("MPIC flags: %x\n", mpic->flags); |
912 | if ((mpic->flags & MPIC_BROKEN_U3) && (mpic->flags & MPIC_PRIMARY)) | |
b9e5b4e6 | 913 | mpic_scan_ht_pics(mpic); |
14cf11af PM |
914 | #endif /* CONFIG_MPIC_BROKEN_U3 */ |
915 | ||
916 | for (i = 0; i < mpic->num_sources; i++) { | |
917 | /* start with vector = source number, and masked */ | |
918 | u32 vecpri = MPIC_VECPRI_MASK | i | (8 << MPIC_VECPRI_PRIORITY_SHIFT); | |
0ebfff14 | 919 | int level = 1; |
14cf11af | 920 | |
14cf11af | 921 | /* do senses munging */ |
0ebfff14 | 922 | if (mpic->senses && i < mpic->senses_count) |
ba1826e5 BH |
923 | vecpri |= mpic_flags_to_vecpri(mpic->senses[i], |
924 | &level); | |
0ebfff14 | 925 | else |
14cf11af PM |
926 | vecpri |= MPIC_VECPRI_SENSE_LEVEL; |
927 | ||
14cf11af PM |
928 | /* deal with broken U3 */ |
929 | if (mpic->flags & MPIC_BROKEN_U3) { | |
930 | #ifdef CONFIG_MPIC_BROKEN_U3 | |
931 | if (mpic_is_ht_interrupt(mpic, i)) { | |
932 | vecpri &= ~(MPIC_VECPRI_SENSE_MASK | | |
933 | MPIC_VECPRI_POLARITY_MASK); | |
934 | vecpri |= MPIC_VECPRI_POLARITY_POSITIVE; | |
935 | } | |
936 | #else | |
937 | printk(KERN_ERR "mpic: BROKEN_U3 set, but CONFIG doesn't match\n"); | |
938 | #endif | |
939 | } | |
940 | ||
941 | DBG("setup source %d, vecpri: %08x, level: %d\n", i, vecpri, | |
942 | (level != 0)); | |
943 | ||
944 | /* init hw */ | |
945 | mpic_irq_write(i, MPIC_IRQ_VECTOR_PRI, vecpri); | |
946 | mpic_irq_write(i, MPIC_IRQ_DESTINATION, | |
947 | 1 << hard_smp_processor_id()); | |
14cf11af PM |
948 | } |
949 | ||
950 | /* Init spurrious vector */ | |
951 | mpic_write(mpic->gregs, MPIC_GREG_SPURIOUS, MPIC_VEC_SPURRIOUS); | |
952 | ||
953 | /* Disable 8259 passthrough */ | |
954 | mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0, | |
955 | mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_0) | |
956 | | MPIC_GREG_GCONF_8259_PTHROU_DIS); | |
957 | ||
958 | /* Set current processor priority to 0 */ | |
959 | mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0); | |
960 | } | |
961 | ||
868ea0c9 MG |
962 | void __init mpic_set_clk_ratio(struct mpic *mpic, u32 clock_ratio) |
963 | { | |
964 | u32 v; | |
965 | ||
966 | v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1); | |
967 | v &= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK; | |
968 | v |= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio); | |
969 | mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v); | |
970 | } | |
14cf11af | 971 | |
868ea0c9 MG |
972 | void __init mpic_set_serial_int(struct mpic *mpic, int enable) |
973 | { | |
ba1826e5 | 974 | unsigned long flags; |
868ea0c9 MG |
975 | u32 v; |
976 | ||
ba1826e5 | 977 | spin_lock_irqsave(&mpic_lock, flags); |
868ea0c9 MG |
978 | v = mpic_read(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1); |
979 | if (enable) | |
980 | v |= MPIC_GREG_GLOBAL_CONF_1_SIE; | |
981 | else | |
982 | v &= ~MPIC_GREG_GLOBAL_CONF_1_SIE; | |
983 | mpic_write(mpic->gregs, MPIC_GREG_GLOBAL_CONF_1, v); | |
ba1826e5 | 984 | spin_unlock_irqrestore(&mpic_lock, flags); |
868ea0c9 | 985 | } |
14cf11af PM |
986 | |
987 | void mpic_irq_set_priority(unsigned int irq, unsigned int pri) | |
988 | { | |
989 | int is_ipi; | |
990 | struct mpic *mpic = mpic_find(irq, &is_ipi); | |
0ebfff14 | 991 | unsigned int src = mpic_irq_to_hw(irq); |
14cf11af PM |
992 | unsigned long flags; |
993 | u32 reg; | |
994 | ||
995 | spin_lock_irqsave(&mpic_lock, flags); | |
996 | if (is_ipi) { | |
0ebfff14 | 997 | reg = mpic_ipi_read(src - MPIC_VEC_IPI_0) & |
e5356640 | 998 | ~MPIC_VECPRI_PRIORITY_MASK; |
0ebfff14 | 999 | mpic_ipi_write(src - MPIC_VEC_IPI_0, |
14cf11af PM |
1000 | reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT)); |
1001 | } else { | |
0ebfff14 | 1002 | reg = mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI) |
e5356640 | 1003 | & ~MPIC_VECPRI_PRIORITY_MASK; |
0ebfff14 | 1004 | mpic_irq_write(src, MPIC_IRQ_VECTOR_PRI, |
14cf11af PM |
1005 | reg | (pri << MPIC_VECPRI_PRIORITY_SHIFT)); |
1006 | } | |
1007 | spin_unlock_irqrestore(&mpic_lock, flags); | |
1008 | } | |
1009 | ||
1010 | unsigned int mpic_irq_get_priority(unsigned int irq) | |
1011 | { | |
1012 | int is_ipi; | |
1013 | struct mpic *mpic = mpic_find(irq, &is_ipi); | |
0ebfff14 | 1014 | unsigned int src = mpic_irq_to_hw(irq); |
14cf11af PM |
1015 | unsigned long flags; |
1016 | u32 reg; | |
1017 | ||
1018 | spin_lock_irqsave(&mpic_lock, flags); | |
1019 | if (is_ipi) | |
0ebfff14 | 1020 | reg = mpic_ipi_read(src = MPIC_VEC_IPI_0); |
14cf11af | 1021 | else |
0ebfff14 | 1022 | reg = mpic_irq_read(src, MPIC_IRQ_VECTOR_PRI); |
14cf11af PM |
1023 | spin_unlock_irqrestore(&mpic_lock, flags); |
1024 | return (reg & MPIC_VECPRI_PRIORITY_MASK) >> MPIC_VECPRI_PRIORITY_SHIFT; | |
1025 | } | |
1026 | ||
1027 | void mpic_setup_this_cpu(void) | |
1028 | { | |
1029 | #ifdef CONFIG_SMP | |
1030 | struct mpic *mpic = mpic_primary; | |
1031 | unsigned long flags; | |
1032 | u32 msk = 1 << hard_smp_processor_id(); | |
1033 | unsigned int i; | |
1034 | ||
1035 | BUG_ON(mpic == NULL); | |
1036 | ||
1037 | DBG("%s: setup_this_cpu(%d)\n", mpic->name, hard_smp_processor_id()); | |
1038 | ||
1039 | spin_lock_irqsave(&mpic_lock, flags); | |
1040 | ||
1041 | /* let the mpic know we want intrs. default affinity is 0xffffffff | |
1042 | * until changed via /proc. That's how it's done on x86. If we want | |
1043 | * it differently, then we should make sure we also change the default | |
a53da52f | 1044 | * values of irq_desc[].affinity in irq.c. |
14cf11af PM |
1045 | */ |
1046 | if (distribute_irqs) { | |
1047 | for (i = 0; i < mpic->num_sources ; i++) | |
1048 | mpic_irq_write(i, MPIC_IRQ_DESTINATION, | |
1049 | mpic_irq_read(i, MPIC_IRQ_DESTINATION) | msk); | |
1050 | } | |
1051 | ||
1052 | /* Set current processor priority to 0 */ | |
1053 | mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0); | |
1054 | ||
1055 | spin_unlock_irqrestore(&mpic_lock, flags); | |
1056 | #endif /* CONFIG_SMP */ | |
1057 | } | |
1058 | ||
1059 | int mpic_cpu_get_priority(void) | |
1060 | { | |
1061 | struct mpic *mpic = mpic_primary; | |
1062 | ||
1063 | return mpic_cpu_read(MPIC_CPU_CURRENT_TASK_PRI); | |
1064 | } | |
1065 | ||
1066 | void mpic_cpu_set_priority(int prio) | |
1067 | { | |
1068 | struct mpic *mpic = mpic_primary; | |
1069 | ||
1070 | prio &= MPIC_CPU_TASKPRI_MASK; | |
1071 | mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, prio); | |
1072 | } | |
1073 | ||
1074 | /* | |
1075 | * XXX: someone who knows mpic should check this. | |
1076 | * do we need to eoi the ipi including for kexec cpu here (see xics comments)? | |
1077 | * or can we reset the mpic in the new kernel? | |
1078 | */ | |
1079 | void mpic_teardown_this_cpu(int secondary) | |
1080 | { | |
1081 | struct mpic *mpic = mpic_primary; | |
1082 | unsigned long flags; | |
1083 | u32 msk = 1 << hard_smp_processor_id(); | |
1084 | unsigned int i; | |
1085 | ||
1086 | BUG_ON(mpic == NULL); | |
1087 | ||
1088 | DBG("%s: teardown_this_cpu(%d)\n", mpic->name, hard_smp_processor_id()); | |
1089 | spin_lock_irqsave(&mpic_lock, flags); | |
1090 | ||
1091 | /* let the mpic know we don't want intrs. */ | |
1092 | for (i = 0; i < mpic->num_sources ; i++) | |
1093 | mpic_irq_write(i, MPIC_IRQ_DESTINATION, | |
1094 | mpic_irq_read(i, MPIC_IRQ_DESTINATION) & ~msk); | |
1095 | ||
1096 | /* Set current processor priority to max */ | |
1097 | mpic_cpu_write(MPIC_CPU_CURRENT_TASK_PRI, 0xf); | |
1098 | ||
1099 | spin_unlock_irqrestore(&mpic_lock, flags); | |
1100 | } | |
1101 | ||
1102 | ||
1103 | void mpic_send_ipi(unsigned int ipi_no, unsigned int cpu_mask) | |
1104 | { | |
1105 | struct mpic *mpic = mpic_primary; | |
1106 | ||
1107 | BUG_ON(mpic == NULL); | |
1108 | ||
1beb6a7d | 1109 | #ifdef DEBUG_IPI |
14cf11af | 1110 | DBG("%s: send_ipi(ipi_no: %d)\n", mpic->name, ipi_no); |
1beb6a7d | 1111 | #endif |
14cf11af PM |
1112 | |
1113 | mpic_cpu_write(MPIC_CPU_IPI_DISPATCH_0 + ipi_no * 0x10, | |
1114 | mpic_physmask(cpu_mask & cpus_addr(cpu_online_map)[0])); | |
1115 | } | |
1116 | ||
0ebfff14 | 1117 | unsigned int mpic_get_one_irq(struct mpic *mpic, struct pt_regs *regs) |
14cf11af | 1118 | { |
0ebfff14 | 1119 | u32 src; |
14cf11af | 1120 | |
0ebfff14 | 1121 | src = mpic_cpu_read(MPIC_CPU_INTACK) & MPIC_VECPRI_VECTOR_MASK; |
1beb6a7d | 1122 | #ifdef DEBUG_LOW |
0ebfff14 | 1123 | DBG("%s: get_one_irq(): %d\n", mpic->name, src); |
1beb6a7d | 1124 | #endif |
0ebfff14 BH |
1125 | if (unlikely(src == MPIC_VEC_SPURRIOUS)) |
1126 | return NO_IRQ; | |
1127 | return irq_linear_revmap(mpic->irqhost, src); | |
14cf11af PM |
1128 | } |
1129 | ||
0ebfff14 | 1130 | unsigned int mpic_get_irq(struct pt_regs *regs) |
14cf11af PM |
1131 | { |
1132 | struct mpic *mpic = mpic_primary; | |
1133 | ||
1134 | BUG_ON(mpic == NULL); | |
1135 | ||
1136 | return mpic_get_one_irq(mpic, regs); | |
1137 | } | |
1138 | ||
1139 | ||
1140 | #ifdef CONFIG_SMP | |
1141 | void mpic_request_ipis(void) | |
1142 | { | |
1143 | struct mpic *mpic = mpic_primary; | |
0ebfff14 BH |
1144 | int i; |
1145 | static char *ipi_names[] = { | |
1146 | "IPI0 (call function)", | |
1147 | "IPI1 (reschedule)", | |
1148 | "IPI2 (unused)", | |
1149 | "IPI3 (debugger break)", | |
1150 | }; | |
14cf11af | 1151 | BUG_ON(mpic == NULL); |
14cf11af | 1152 | |
0ebfff14 BH |
1153 | printk(KERN_INFO "mpic: requesting IPIs ... \n"); |
1154 | ||
1155 | for (i = 0; i < 4; i++) { | |
1156 | unsigned int vipi = irq_create_mapping(mpic->irqhost, | |
1157 | MPIC_VEC_IPI_0 + i, 0); | |
1158 | if (vipi == NO_IRQ) { | |
1159 | printk(KERN_ERR "Failed to map IPI %d\n", i); | |
1160 | break; | |
1161 | } | |
1162 | request_irq(vipi, mpic_ipi_action, IRQF_DISABLED, | |
1163 | ipi_names[i], mpic); | |
1164 | } | |
14cf11af | 1165 | } |
a9c59264 PM |
1166 | |
1167 | void smp_mpic_message_pass(int target, int msg) | |
1168 | { | |
1169 | /* make sure we're sending something that translates to an IPI */ | |
1170 | if ((unsigned int)msg > 3) { | |
1171 | printk("SMP %d: smp_message_pass: unknown msg %d\n", | |
1172 | smp_processor_id(), msg); | |
1173 | return; | |
1174 | } | |
1175 | switch (target) { | |
1176 | case MSG_ALL: | |
1177 | mpic_send_ipi(msg, 0xffffffff); | |
1178 | break; | |
1179 | case MSG_ALL_BUT_SELF: | |
1180 | mpic_send_ipi(msg, 0xffffffff & ~(1 << smp_processor_id())); | |
1181 | break; | |
1182 | default: | |
1183 | mpic_send_ipi(msg, 1 << target); | |
1184 | break; | |
1185 | } | |
1186 | } | |
14cf11af | 1187 | #endif /* CONFIG_SMP */ |