2 * arch/powerpc/kernel/mpic.c
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.
8 * Copyright (C) 2004 Benjamin Herrenschmidt, IBM Corp.
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
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>
30 #include <asm/ptrace.h>
31 #include <asm/signal.h>
33 #include <asm/pgtable.h>
35 #include <asm/machdep.h>
42 #define DBG(fmt...) printk(fmt)
47 static struct mpic
*mpics
;
48 static struct mpic
*mpic_primary
;
49 static DEFINE_SPINLOCK(mpic_lock
);
51 #ifdef CONFIG_PPC32 /* XXX for now */
52 #ifdef CONFIG_IRQ_ALL_CPUS
53 #define distribute_irqs (1)
55 #define distribute_irqs (0)
59 #ifdef CONFIG_MPIC_WEIRD
60 static u32 mpic_infos
[][MPIC_IDX_END
] = {
61 [0] = { /* Original OpenPIC compatible MPIC */
64 MPIC_GREG_GLOBAL_CONF_0
,
66 MPIC_GREG_IPI_VECTOR_PRI_0
,
73 MPIC_TIMER_CURRENT_CNT
,
75 MPIC_TIMER_VECTOR_PRI
,
76 MPIC_TIMER_DESTINATION
,
80 MPIC_CPU_IPI_DISPATCH_0
,
81 MPIC_CPU_IPI_DISPATCH_STRIDE
,
82 MPIC_CPU_CURRENT_TASK_PRI
,
91 MPIC_VECPRI_VECTOR_MASK
,
92 MPIC_VECPRI_POLARITY_POSITIVE
,
93 MPIC_VECPRI_POLARITY_NEGATIVE
,
94 MPIC_VECPRI_SENSE_LEVEL
,
95 MPIC_VECPRI_SENSE_EDGE
,
96 MPIC_VECPRI_POLARITY_MASK
,
97 MPIC_VECPRI_SENSE_MASK
,
100 [1] = { /* Tsi108/109 PIC */
102 TSI108_GREG_FEATURE_0
,
103 TSI108_GREG_GLOBAL_CONF_0
,
104 TSI108_GREG_VENDOR_ID
,
105 TSI108_GREG_IPI_VECTOR_PRI_0
,
106 TSI108_GREG_IPI_STRIDE
,
107 TSI108_GREG_SPURIOUS
,
108 TSI108_GREG_TIMER_FREQ
,
112 TSI108_TIMER_CURRENT_CNT
,
113 TSI108_TIMER_BASE_CNT
,
114 TSI108_TIMER_VECTOR_PRI
,
115 TSI108_TIMER_DESTINATION
,
119 TSI108_CPU_IPI_DISPATCH_0
,
120 TSI108_CPU_IPI_DISPATCH_STRIDE
,
121 TSI108_CPU_CURRENT_TASK_PRI
,
129 TSI108_IRQ_VECTOR_PRI
,
130 TSI108_VECPRI_VECTOR_MASK
,
131 TSI108_VECPRI_POLARITY_POSITIVE
,
132 TSI108_VECPRI_POLARITY_NEGATIVE
,
133 TSI108_VECPRI_SENSE_LEVEL
,
134 TSI108_VECPRI_SENSE_EDGE
,
135 TSI108_VECPRI_POLARITY_MASK
,
136 TSI108_VECPRI_SENSE_MASK
,
137 TSI108_IRQ_DESTINATION
141 #define MPIC_INFO(name) mpic->hw_set[MPIC_IDX_##name]
143 #else /* CONFIG_MPIC_WEIRD */
145 #define MPIC_INFO(name) MPIC_##name
147 #endif /* CONFIG_MPIC_WEIRD */
150 * Register accessor functions
154 static inline u32
_mpic_read(enum mpic_reg_type type
,
155 struct mpic_reg_bank
*rb
,
159 #ifdef CONFIG_PPC_DCR
160 case mpic_access_dcr
:
161 return dcr_read(rb
->dhost
, reg
);
163 case mpic_access_mmio_be
:
164 return in_be32(rb
->base
+ (reg
>> 2));
165 case mpic_access_mmio_le
:
167 return in_le32(rb
->base
+ (reg
>> 2));
171 static inline void _mpic_write(enum mpic_reg_type type
,
172 struct mpic_reg_bank
*rb
,
173 unsigned int reg
, u32 value
)
176 #ifdef CONFIG_PPC_DCR
177 case mpic_access_dcr
:
178 dcr_write(rb
->dhost
, reg
, value
);
181 case mpic_access_mmio_be
:
182 out_be32(rb
->base
+ (reg
>> 2), value
);
184 case mpic_access_mmio_le
:
186 out_le32(rb
->base
+ (reg
>> 2), value
);
191 static inline u32
_mpic_ipi_read(struct mpic
*mpic
, unsigned int ipi
)
193 enum mpic_reg_type type
= mpic
->reg_type
;
194 unsigned int offset
= MPIC_INFO(GREG_IPI_VECTOR_PRI_0
) +
195 (ipi
* MPIC_INFO(GREG_IPI_STRIDE
));
197 if ((mpic
->flags
& MPIC_BROKEN_IPI
) && type
== mpic_access_mmio_le
)
198 type
= mpic_access_mmio_be
;
199 return _mpic_read(type
, &mpic
->gregs
, offset
);
202 static inline void _mpic_ipi_write(struct mpic
*mpic
, unsigned int ipi
, u32 value
)
204 unsigned int offset
= MPIC_INFO(GREG_IPI_VECTOR_PRI_0
) +
205 (ipi
* MPIC_INFO(GREG_IPI_STRIDE
));
207 _mpic_write(mpic
->reg_type
, &mpic
->gregs
, offset
, value
);
210 static inline u32
_mpic_cpu_read(struct mpic
*mpic
, unsigned int reg
)
212 unsigned int cpu
= 0;
214 if (mpic
->flags
& MPIC_PRIMARY
)
215 cpu
= hard_smp_processor_id();
216 return _mpic_read(mpic
->reg_type
, &mpic
->cpuregs
[cpu
], reg
);
219 static inline void _mpic_cpu_write(struct mpic
*mpic
, unsigned int reg
, u32 value
)
221 unsigned int cpu
= 0;
223 if (mpic
->flags
& MPIC_PRIMARY
)
224 cpu
= hard_smp_processor_id();
226 _mpic_write(mpic
->reg_type
, &mpic
->cpuregs
[cpu
], reg
, value
);
229 static inline u32
_mpic_irq_read(struct mpic
*mpic
, unsigned int src_no
, unsigned int reg
)
231 unsigned int isu
= src_no
>> mpic
->isu_shift
;
232 unsigned int idx
= src_no
& mpic
->isu_mask
;
234 #ifdef CONFIG_MPIC_BROKEN_REGREAD
236 return mpic
->isu_reg0_shadow
[idx
];
239 return _mpic_read(mpic
->reg_type
, &mpic
->isus
[isu
],
240 reg
+ (idx
* MPIC_INFO(IRQ_STRIDE
)));
243 static inline void _mpic_irq_write(struct mpic
*mpic
, unsigned int src_no
,
244 unsigned int reg
, u32 value
)
246 unsigned int isu
= src_no
>> mpic
->isu_shift
;
247 unsigned int idx
= src_no
& mpic
->isu_mask
;
249 _mpic_write(mpic
->reg_type
, &mpic
->isus
[isu
],
250 reg
+ (idx
* MPIC_INFO(IRQ_STRIDE
)), value
);
252 #ifdef CONFIG_MPIC_BROKEN_REGREAD
254 mpic
->isu_reg0_shadow
[idx
] = value
;
258 #define mpic_read(b,r) _mpic_read(mpic->reg_type,&(b),(r))
259 #define mpic_write(b,r,v) _mpic_write(mpic->reg_type,&(b),(r),(v))
260 #define mpic_ipi_read(i) _mpic_ipi_read(mpic,(i))
261 #define mpic_ipi_write(i,v) _mpic_ipi_write(mpic,(i),(v))
262 #define mpic_cpu_read(i) _mpic_cpu_read(mpic,(i))
263 #define mpic_cpu_write(i,v) _mpic_cpu_write(mpic,(i),(v))
264 #define mpic_irq_read(s,r) _mpic_irq_read(mpic,(s),(r))
265 #define mpic_irq_write(s,r,v) _mpic_irq_write(mpic,(s),(r),(v))
269 * Low level utility functions
273 static void _mpic_map_mmio(struct mpic
*mpic
, phys_addr_t phys_addr
,
274 struct mpic_reg_bank
*rb
, unsigned int offset
,
277 rb
->base
= ioremap(phys_addr
+ offset
, size
);
278 BUG_ON(rb
->base
== NULL
);
281 #ifdef CONFIG_PPC_DCR
282 static void _mpic_map_dcr(struct mpic
*mpic
, struct mpic_reg_bank
*rb
,
283 unsigned int offset
, unsigned int size
)
287 dbasep
= of_get_property(mpic
->irqhost
->of_node
, "dcr-reg", NULL
);
289 rb
->dhost
= dcr_map(mpic
->irqhost
->of_node
, *dbasep
+ offset
, size
);
290 BUG_ON(!DCR_MAP_OK(rb
->dhost
));
293 static inline void mpic_map(struct mpic
*mpic
, phys_addr_t phys_addr
,
294 struct mpic_reg_bank
*rb
, unsigned int offset
,
297 if (mpic
->flags
& MPIC_USES_DCR
)
298 _mpic_map_dcr(mpic
, rb
, offset
, size
);
300 _mpic_map_mmio(mpic
, phys_addr
, rb
, offset
, size
);
302 #else /* CONFIG_PPC_DCR */
303 #define mpic_map(m,p,b,o,s) _mpic_map_mmio(m,p,b,o,s)
304 #endif /* !CONFIG_PPC_DCR */
308 /* Check if we have one of those nice broken MPICs with a flipped endian on
309 * reads from IPI registers
311 static void __init
mpic_test_broken_ipi(struct mpic
*mpic
)
315 mpic_write(mpic
->gregs
, MPIC_INFO(GREG_IPI_VECTOR_PRI_0
), MPIC_VECPRI_MASK
);
316 r
= mpic_read(mpic
->gregs
, MPIC_INFO(GREG_IPI_VECTOR_PRI_0
));
318 if (r
== le32_to_cpu(MPIC_VECPRI_MASK
)) {
319 printk(KERN_INFO
"mpic: Detected reversed IPI registers\n");
320 mpic
->flags
|= MPIC_BROKEN_IPI
;
324 #ifdef CONFIG_MPIC_U3_HT_IRQS
326 /* Test if an interrupt is sourced from HyperTransport (used on broken U3s)
327 * to force the edge setting on the MPIC and do the ack workaround.
329 static inline int mpic_is_ht_interrupt(struct mpic
*mpic
, unsigned int source
)
331 if (source
>= 128 || !mpic
->fixups
)
333 return mpic
->fixups
[source
].base
!= NULL
;
337 static inline void mpic_ht_end_irq(struct mpic
*mpic
, unsigned int source
)
339 struct mpic_irq_fixup
*fixup
= &mpic
->fixups
[source
];
341 if (fixup
->applebase
) {
342 unsigned int soff
= (fixup
->index
>> 3) & ~3;
343 unsigned int mask
= 1U << (fixup
->index
& 0x1f);
344 writel(mask
, fixup
->applebase
+ soff
);
346 spin_lock(&mpic
->fixup_lock
);
347 writeb(0x11 + 2 * fixup
->index
, fixup
->base
+ 2);
348 writel(fixup
->data
, fixup
->base
+ 4);
349 spin_unlock(&mpic
->fixup_lock
);
353 static void mpic_startup_ht_interrupt(struct mpic
*mpic
, unsigned int source
,
354 unsigned int irqflags
)
356 struct mpic_irq_fixup
*fixup
= &mpic
->fixups
[source
];
360 if (fixup
->base
== NULL
)
363 DBG("startup_ht_interrupt(0x%x, 0x%x) index: %d\n",
364 source
, irqflags
, fixup
->index
);
365 spin_lock_irqsave(&mpic
->fixup_lock
, flags
);
366 /* Enable and configure */
367 writeb(0x10 + 2 * fixup
->index
, fixup
->base
+ 2);
368 tmp
= readl(fixup
->base
+ 4);
370 if (irqflags
& IRQ_LEVEL
)
372 writel(tmp
, fixup
->base
+ 4);
373 spin_unlock_irqrestore(&mpic
->fixup_lock
, flags
);
376 /* use the lowest bit inverted to the actual HW,
377 * set if this fixup was enabled, clear otherwise */
378 mpic
->save_data
[source
].fixup_data
= tmp
| 1;
382 static void mpic_shutdown_ht_interrupt(struct mpic
*mpic
, unsigned int source
,
383 unsigned int irqflags
)
385 struct mpic_irq_fixup
*fixup
= &mpic
->fixups
[source
];
389 if (fixup
->base
== NULL
)
392 DBG("shutdown_ht_interrupt(0x%x, 0x%x)\n", source
, irqflags
);
395 spin_lock_irqsave(&mpic
->fixup_lock
, flags
);
396 writeb(0x10 + 2 * fixup
->index
, fixup
->base
+ 2);
397 tmp
= readl(fixup
->base
+ 4);
399 writel(tmp
, fixup
->base
+ 4);
400 spin_unlock_irqrestore(&mpic
->fixup_lock
, flags
);
403 /* use the lowest bit inverted to the actual HW,
404 * set if this fixup was enabled, clear otherwise */
405 mpic
->save_data
[source
].fixup_data
= tmp
& ~1;
409 #ifdef CONFIG_PCI_MSI
410 static void __init
mpic_scan_ht_msi(struct mpic
*mpic
, u8 __iomem
*devbase
,
417 for (pos
= readb(devbase
+ PCI_CAPABILITY_LIST
); pos
!= 0;
418 pos
= readb(devbase
+ pos
+ PCI_CAP_LIST_NEXT
)) {
419 u8 id
= readb(devbase
+ pos
+ PCI_CAP_LIST_ID
);
420 if (id
== PCI_CAP_ID_HT
) {
421 id
= readb(devbase
+ pos
+ 3);
422 if ((id
& HT_5BIT_CAP_MASK
) == HT_CAPTYPE_MSI_MAPPING
)
430 base
= devbase
+ pos
;
432 flags
= readb(base
+ HT_MSI_FLAGS
);
433 if (!(flags
& HT_MSI_FLAGS_FIXED
)) {
434 addr
= readl(base
+ HT_MSI_ADDR_LO
) & HT_MSI_ADDR_LO_MASK
;
435 addr
= addr
| ((u64
)readl(base
+ HT_MSI_ADDR_HI
) << 32);
438 printk(KERN_DEBUG
"mpic: - HT:%02x.%x %s MSI mapping found @ 0x%lx\n",
439 PCI_SLOT(devfn
), PCI_FUNC(devfn
),
440 flags
& HT_MSI_FLAGS_ENABLE
? "enabled" : "disabled", addr
);
442 if (!(flags
& HT_MSI_FLAGS_ENABLE
))
443 writeb(flags
| HT_MSI_FLAGS_ENABLE
, base
+ HT_MSI_FLAGS
);
446 static void __init
mpic_scan_ht_msi(struct mpic
*mpic
, u8 __iomem
*devbase
,
453 static void __init
mpic_scan_ht_pic(struct mpic
*mpic
, u8 __iomem
*devbase
,
454 unsigned int devfn
, u32 vdid
)
461 for (pos
= readb(devbase
+ PCI_CAPABILITY_LIST
); pos
!= 0;
462 pos
= readb(devbase
+ pos
+ PCI_CAP_LIST_NEXT
)) {
463 u8 id
= readb(devbase
+ pos
+ PCI_CAP_LIST_ID
);
464 if (id
== PCI_CAP_ID_HT
) {
465 id
= readb(devbase
+ pos
+ 3);
466 if ((id
& HT_5BIT_CAP_MASK
) == HT_CAPTYPE_IRQ
)
473 base
= devbase
+ pos
;
474 writeb(0x01, base
+ 2);
475 n
= (readl(base
+ 4) >> 16) & 0xff;
477 printk(KERN_INFO
"mpic: - HT:%02x.%x [0x%02x] vendor %04x device %04x"
479 devfn
>> 3, devfn
& 0x7, pos
, vdid
& 0xffff, vdid
>> 16, n
+ 1);
481 for (i
= 0; i
<= n
; i
++) {
482 writeb(0x10 + 2 * i
, base
+ 2);
483 tmp
= readl(base
+ 4);
484 irq
= (tmp
>> 16) & 0xff;
485 DBG("HT PIC index 0x%x, irq 0x%x, tmp: %08x\n", i
, irq
, tmp
);
486 /* mask it , will be unmasked later */
488 writel(tmp
, base
+ 4);
489 mpic
->fixups
[irq
].index
= i
;
490 mpic
->fixups
[irq
].base
= base
;
491 /* Apple HT PIC has a non-standard way of doing EOIs */
492 if ((vdid
& 0xffff) == 0x106b)
493 mpic
->fixups
[irq
].applebase
= devbase
+ 0x60;
495 mpic
->fixups
[irq
].applebase
= NULL
;
496 writeb(0x11 + 2 * i
, base
+ 2);
497 mpic
->fixups
[irq
].data
= readl(base
+ 4) | 0x80000000;
502 static void __init
mpic_scan_ht_pics(struct mpic
*mpic
)
505 u8 __iomem
*cfgspace
;
507 printk(KERN_INFO
"mpic: Setting up HT PICs workarounds for U3/U4\n");
509 /* Allocate fixups array */
510 mpic
->fixups
= alloc_bootmem(128 * sizeof(struct mpic_irq_fixup
));
511 BUG_ON(mpic
->fixups
== NULL
);
512 memset(mpic
->fixups
, 0, 128 * sizeof(struct mpic_irq_fixup
));
515 spin_lock_init(&mpic
->fixup_lock
);
517 /* Map U3 config space. We assume all IO-APICs are on the primary bus
518 * so we only need to map 64kB.
520 cfgspace
= ioremap(0xf2000000, 0x10000);
521 BUG_ON(cfgspace
== NULL
);
523 /* Now we scan all slots. We do a very quick scan, we read the header
524 * type, vendor ID and device ID only, that's plenty enough
526 for (devfn
= 0; devfn
< 0x100; devfn
++) {
527 u8 __iomem
*devbase
= cfgspace
+ (devfn
<< 8);
528 u8 hdr_type
= readb(devbase
+ PCI_HEADER_TYPE
);
529 u32 l
= readl(devbase
+ PCI_VENDOR_ID
);
532 DBG("devfn %x, l: %x\n", devfn
, l
);
534 /* If no device, skip */
535 if (l
== 0xffffffff || l
== 0x00000000 ||
536 l
== 0x0000ffff || l
== 0xffff0000)
538 /* Check if is supports capability lists */
539 s
= readw(devbase
+ PCI_STATUS
);
540 if (!(s
& PCI_STATUS_CAP_LIST
))
543 mpic_scan_ht_pic(mpic
, devbase
, devfn
, l
);
544 mpic_scan_ht_msi(mpic
, devbase
, devfn
);
547 /* next device, if function 0 */
548 if (PCI_FUNC(devfn
) == 0 && (hdr_type
& 0x80) == 0)
553 #else /* CONFIG_MPIC_U3_HT_IRQS */
555 static inline int mpic_is_ht_interrupt(struct mpic
*mpic
, unsigned int source
)
560 static void __init
mpic_scan_ht_pics(struct mpic
*mpic
)
564 #endif /* CONFIG_MPIC_U3_HT_IRQS */
567 #define mpic_irq_to_hw(virq) ((unsigned int)irq_map[virq].hwirq)
569 /* Find an mpic associated with a given linux interrupt */
570 static struct mpic
*mpic_find(unsigned int irq
, unsigned int *is_ipi
)
572 unsigned int src
= mpic_irq_to_hw(irq
);
575 if (irq
< NUM_ISA_INTERRUPTS
)
578 mpic
= irq_desc
[irq
].chip_data
;
581 *is_ipi
= (src
>= mpic
->ipi_vecs
[0] &&
582 src
<= mpic
->ipi_vecs
[3]);
587 /* Convert a cpu mask from logical to physical cpu numbers. */
588 static inline u32
mpic_physmask(u32 cpumask
)
593 for (i
= 0; i
< NR_CPUS
; ++i
, cpumask
>>= 1)
594 mask
|= (cpumask
& 1) << get_hard_smp_processor_id(i
);
599 /* Get the mpic structure from the IPI number */
600 static inline struct mpic
* mpic_from_ipi(unsigned int ipi
)
602 return irq_desc
[ipi
].chip_data
;
606 /* Get the mpic structure from the irq number */
607 static inline struct mpic
* mpic_from_irq(unsigned int irq
)
609 return irq_desc
[irq
].chip_data
;
613 static inline void mpic_eoi(struct mpic
*mpic
)
615 mpic_cpu_write(MPIC_INFO(CPU_EOI
), 0);
616 (void)mpic_cpu_read(MPIC_INFO(CPU_WHOAMI
));
620 static irqreturn_t
mpic_ipi_action(int irq
, void *data
)
622 long ipi
= (long)data
;
624 smp_message_recv(ipi
);
628 #endif /* CONFIG_SMP */
631 * Linux descriptor level callbacks
635 void mpic_unmask_irq(unsigned int irq
)
637 unsigned int loops
= 100000;
638 struct mpic
*mpic
= mpic_from_irq(irq
);
639 unsigned int src
= mpic_irq_to_hw(irq
);
641 DBG("%p: %s: enable_irq: %d (src %d)\n", mpic
, mpic
->name
, irq
, src
);
643 mpic_irq_write(src
, MPIC_INFO(IRQ_VECTOR_PRI
),
644 mpic_irq_read(src
, MPIC_INFO(IRQ_VECTOR_PRI
)) &
646 /* make sure mask gets to controller before we return to user */
649 printk(KERN_ERR
"mpic_enable_irq timeout\n");
652 } while(mpic_irq_read(src
, MPIC_INFO(IRQ_VECTOR_PRI
)) & MPIC_VECPRI_MASK
);
655 void mpic_mask_irq(unsigned int irq
)
657 unsigned int loops
= 100000;
658 struct mpic
*mpic
= mpic_from_irq(irq
);
659 unsigned int src
= mpic_irq_to_hw(irq
);
661 DBG("%s: disable_irq: %d (src %d)\n", mpic
->name
, irq
, src
);
663 mpic_irq_write(src
, MPIC_INFO(IRQ_VECTOR_PRI
),
664 mpic_irq_read(src
, MPIC_INFO(IRQ_VECTOR_PRI
)) |
667 /* make sure mask gets to controller before we return to user */
670 printk(KERN_ERR
"mpic_enable_irq timeout\n");
673 } while(!(mpic_irq_read(src
, MPIC_INFO(IRQ_VECTOR_PRI
)) & MPIC_VECPRI_MASK
));
676 void mpic_end_irq(unsigned int irq
)
678 struct mpic
*mpic
= mpic_from_irq(irq
);
681 DBG("%s: end_irq: %d\n", mpic
->name
, irq
);
683 /* We always EOI on end_irq() even for edge interrupts since that
684 * should only lower the priority, the MPIC should have properly
685 * latched another edge interrupt coming in anyway
691 #ifdef CONFIG_MPIC_U3_HT_IRQS
693 static void mpic_unmask_ht_irq(unsigned int irq
)
695 struct mpic
*mpic
= mpic_from_irq(irq
);
696 unsigned int src
= mpic_irq_to_hw(irq
);
698 mpic_unmask_irq(irq
);
700 if (irq_desc
[irq
].status
& IRQ_LEVEL
)
701 mpic_ht_end_irq(mpic
, src
);
704 static unsigned int mpic_startup_ht_irq(unsigned int irq
)
706 struct mpic
*mpic
= mpic_from_irq(irq
);
707 unsigned int src
= mpic_irq_to_hw(irq
);
709 mpic_unmask_irq(irq
);
710 mpic_startup_ht_interrupt(mpic
, src
, irq_desc
[irq
].status
);
715 static void mpic_shutdown_ht_irq(unsigned int irq
)
717 struct mpic
*mpic
= mpic_from_irq(irq
);
718 unsigned int src
= mpic_irq_to_hw(irq
);
720 mpic_shutdown_ht_interrupt(mpic
, src
, irq_desc
[irq
].status
);
724 static void mpic_end_ht_irq(unsigned int irq
)
726 struct mpic
*mpic
= mpic_from_irq(irq
);
727 unsigned int src
= mpic_irq_to_hw(irq
);
730 DBG("%s: end_irq: %d\n", mpic
->name
, irq
);
732 /* We always EOI on end_irq() even for edge interrupts since that
733 * should only lower the priority, the MPIC should have properly
734 * latched another edge interrupt coming in anyway
737 if (irq_desc
[irq
].status
& IRQ_LEVEL
)
738 mpic_ht_end_irq(mpic
, src
);
741 #endif /* !CONFIG_MPIC_U3_HT_IRQS */
745 static void mpic_unmask_ipi(unsigned int irq
)
747 struct mpic
*mpic
= mpic_from_ipi(irq
);
748 unsigned int src
= mpic_irq_to_hw(irq
) - mpic
->ipi_vecs
[0];
750 DBG("%s: enable_ipi: %d (ipi %d)\n", mpic
->name
, irq
, src
);
751 mpic_ipi_write(src
, mpic_ipi_read(src
) & ~MPIC_VECPRI_MASK
);
754 static void mpic_mask_ipi(unsigned int irq
)
756 /* NEVER disable an IPI... that's just plain wrong! */
759 static void mpic_end_ipi(unsigned int irq
)
761 struct mpic
*mpic
= mpic_from_ipi(irq
);
764 * IPIs are marked IRQ_PER_CPU. This has the side effect of
765 * preventing the IRQ_PENDING/IRQ_INPROGRESS logic from
766 * applying to them. We EOI them late to avoid re-entering.
767 * We mark IPI's with IRQF_DISABLED as they must run with
773 #endif /* CONFIG_SMP */
775 void mpic_set_affinity(unsigned int irq
, cpumask_t cpumask
)
777 struct mpic
*mpic
= mpic_from_irq(irq
);
778 unsigned int src
= mpic_irq_to_hw(irq
);
782 cpus_and(tmp
, cpumask
, cpu_online_map
);
784 mpic_irq_write(src
, MPIC_INFO(IRQ_DESTINATION
),
785 mpic_physmask(cpus_addr(tmp
)[0]));
788 static unsigned int mpic_type_to_vecpri(struct mpic
*mpic
, unsigned int type
)
790 /* Now convert sense value */
791 switch(type
& IRQ_TYPE_SENSE_MASK
) {
792 case IRQ_TYPE_EDGE_RISING
:
793 return MPIC_INFO(VECPRI_SENSE_EDGE
) |
794 MPIC_INFO(VECPRI_POLARITY_POSITIVE
);
795 case IRQ_TYPE_EDGE_FALLING
:
796 case IRQ_TYPE_EDGE_BOTH
:
797 return MPIC_INFO(VECPRI_SENSE_EDGE
) |
798 MPIC_INFO(VECPRI_POLARITY_NEGATIVE
);
799 case IRQ_TYPE_LEVEL_HIGH
:
800 return MPIC_INFO(VECPRI_SENSE_LEVEL
) |
801 MPIC_INFO(VECPRI_POLARITY_POSITIVE
);
802 case IRQ_TYPE_LEVEL_LOW
:
804 return MPIC_INFO(VECPRI_SENSE_LEVEL
) |
805 MPIC_INFO(VECPRI_POLARITY_NEGATIVE
);
809 int mpic_set_irq_type(unsigned int virq
, unsigned int flow_type
)
811 struct mpic
*mpic
= mpic_from_irq(virq
);
812 unsigned int src
= mpic_irq_to_hw(virq
);
813 struct irq_desc
*desc
= get_irq_desc(virq
);
814 unsigned int vecpri
, vold
, vnew
;
816 DBG("mpic: set_irq_type(mpic:@%p,virq:%d,src:0x%x,type:0x%x)\n",
817 mpic
, virq
, src
, flow_type
);
819 if (src
>= mpic
->irq_count
)
822 if (flow_type
== IRQ_TYPE_NONE
)
823 if (mpic
->senses
&& src
< mpic
->senses_count
)
824 flow_type
= mpic
->senses
[src
];
825 if (flow_type
== IRQ_TYPE_NONE
)
826 flow_type
= IRQ_TYPE_LEVEL_LOW
;
828 desc
->status
&= ~(IRQ_TYPE_SENSE_MASK
| IRQ_LEVEL
);
829 desc
->status
|= flow_type
& IRQ_TYPE_SENSE_MASK
;
830 if (flow_type
& (IRQ_TYPE_LEVEL_HIGH
| IRQ_TYPE_LEVEL_LOW
))
831 desc
->status
|= IRQ_LEVEL
;
833 if (mpic_is_ht_interrupt(mpic
, src
))
834 vecpri
= MPIC_VECPRI_POLARITY_POSITIVE
|
835 MPIC_VECPRI_SENSE_EDGE
;
837 vecpri
= mpic_type_to_vecpri(mpic
, flow_type
);
839 vold
= mpic_irq_read(src
, MPIC_INFO(IRQ_VECTOR_PRI
));
840 vnew
= vold
& ~(MPIC_INFO(VECPRI_POLARITY_MASK
) |
841 MPIC_INFO(VECPRI_SENSE_MASK
));
844 mpic_irq_write(src
, MPIC_INFO(IRQ_VECTOR_PRI
), vnew
);
849 void mpic_set_vector(unsigned int virq
, unsigned int vector
)
851 struct mpic
*mpic
= mpic_from_irq(virq
);
852 unsigned int src
= mpic_irq_to_hw(virq
);
855 DBG("mpic: set_vector(mpic:@%p,virq:%d,src:%d,vector:0x%x)\n",
856 mpic
, virq
, src
, vector
);
858 if (src
>= mpic
->irq_count
)
861 vecpri
= mpic_irq_read(src
, MPIC_INFO(IRQ_VECTOR_PRI
));
862 vecpri
= vecpri
& ~MPIC_INFO(VECPRI_VECTOR_MASK
);
864 mpic_irq_write(src
, MPIC_INFO(IRQ_VECTOR_PRI
), vecpri
);
867 static struct irq_chip mpic_irq_chip
= {
868 .mask
= mpic_mask_irq
,
869 .unmask
= mpic_unmask_irq
,
871 .set_type
= mpic_set_irq_type
,
875 static struct irq_chip mpic_ipi_chip
= {
876 .mask
= mpic_mask_ipi
,
877 .unmask
= mpic_unmask_ipi
,
880 #endif /* CONFIG_SMP */
882 #ifdef CONFIG_MPIC_U3_HT_IRQS
883 static struct irq_chip mpic_irq_ht_chip
= {
884 .startup
= mpic_startup_ht_irq
,
885 .shutdown
= mpic_shutdown_ht_irq
,
886 .mask
= mpic_mask_irq
,
887 .unmask
= mpic_unmask_ht_irq
,
888 .eoi
= mpic_end_ht_irq
,
889 .set_type
= mpic_set_irq_type
,
891 #endif /* CONFIG_MPIC_U3_HT_IRQS */
894 static int mpic_host_match(struct irq_host
*h
, struct device_node
*node
)
896 /* Exact match, unless mpic node is NULL */
897 return h
->of_node
== NULL
|| h
->of_node
== node
;
900 static int mpic_host_map(struct irq_host
*h
, unsigned int virq
,
903 struct mpic
*mpic
= h
->host_data
;
904 struct irq_chip
*chip
;
906 DBG("mpic: map virq %d, hwirq 0x%lx\n", virq
, hw
);
908 if (hw
== mpic
->spurious_vec
)
910 if (mpic
->protected && test_bit(hw
, mpic
->protected))
914 else if (hw
>= mpic
->ipi_vecs
[0]) {
915 WARN_ON(!(mpic
->flags
& MPIC_PRIMARY
));
917 DBG("mpic: mapping as IPI\n");
918 set_irq_chip_data(virq
, mpic
);
919 set_irq_chip_and_handler(virq
, &mpic
->hc_ipi
,
923 #endif /* CONFIG_SMP */
925 if (hw
>= mpic
->irq_count
)
928 mpic_msi_reserve_hwirq(mpic
, hw
);
931 chip
= &mpic
->hc_irq
;
933 #ifdef CONFIG_MPIC_U3_HT_IRQS
934 /* Check for HT interrupts, override vecpri */
935 if (mpic_is_ht_interrupt(mpic
, hw
))
936 chip
= &mpic
->hc_ht_irq
;
937 #endif /* CONFIG_MPIC_U3_HT_IRQS */
939 DBG("mpic: mapping to irq chip @%p\n", chip
);
941 set_irq_chip_data(virq
, mpic
);
942 set_irq_chip_and_handler(virq
, chip
, handle_fasteoi_irq
);
944 /* Set default irq type */
945 set_irq_type(virq
, IRQ_TYPE_NONE
);
950 static int mpic_host_xlate(struct irq_host
*h
, struct device_node
*ct
,
951 u32
*intspec
, unsigned int intsize
,
952 irq_hw_number_t
*out_hwirq
, unsigned int *out_flags
)
955 static unsigned char map_mpic_senses
[4] = {
956 IRQ_TYPE_EDGE_RISING
,
959 IRQ_TYPE_EDGE_FALLING
,
962 *out_hwirq
= intspec
[0];
966 /* Apple invented a new race of encoding on machines with
967 * an HT APIC. They encode, among others, the index within
968 * the HT APIC. We don't care about it here since thankfully,
969 * it appears that they have the APIC already properly
970 * configured, and thus our current fixup code that reads the
971 * APIC config works fine. However, we still need to mask out
972 * bits in the specifier to make sure we only get bit 0 which
973 * is the level/edge bit (the only sense bit exposed by Apple),
974 * as their bit 1 means something else.
976 if (machine_is(powermac
))
978 *out_flags
= map_mpic_senses
[intspec
[1] & mask
];
980 *out_flags
= IRQ_TYPE_NONE
;
982 DBG("mpic: xlate (%d cells: 0x%08x 0x%08x) to line 0x%lx sense 0x%x\n",
983 intsize
, intspec
[0], intspec
[1], *out_hwirq
, *out_flags
);
988 static struct irq_host_ops mpic_host_ops
= {
989 .match
= mpic_host_match
,
990 .map
= mpic_host_map
,
991 .xlate
= mpic_host_xlate
,
998 struct mpic
* __init
mpic_alloc(struct device_node
*node
,
999 phys_addr_t phys_addr
,
1001 unsigned int isu_size
,
1002 unsigned int irq_count
,
1010 u64 paddr
= phys_addr
;
1012 mpic
= alloc_bootmem(sizeof(struct mpic
));
1016 memset(mpic
, 0, sizeof(struct mpic
));
1019 mpic
->irqhost
= irq_alloc_host(of_node_get(node
), IRQ_HOST_MAP_LINEAR
,
1020 isu_size
, &mpic_host_ops
,
1021 flags
& MPIC_LARGE_VECTORS
? 2048 : 256);
1022 if (mpic
->irqhost
== NULL
) {
1027 mpic
->irqhost
->host_data
= mpic
;
1028 mpic
->hc_irq
= mpic_irq_chip
;
1029 mpic
->hc_irq
.typename
= name
;
1030 if (flags
& MPIC_PRIMARY
)
1031 mpic
->hc_irq
.set_affinity
= mpic_set_affinity
;
1032 #ifdef CONFIG_MPIC_U3_HT_IRQS
1033 mpic
->hc_ht_irq
= mpic_irq_ht_chip
;
1034 mpic
->hc_ht_irq
.typename
= name
;
1035 if (flags
& MPIC_PRIMARY
)
1036 mpic
->hc_ht_irq
.set_affinity
= mpic_set_affinity
;
1037 #endif /* CONFIG_MPIC_U3_HT_IRQS */
1040 mpic
->hc_ipi
= mpic_ipi_chip
;
1041 mpic
->hc_ipi
.typename
= name
;
1042 #endif /* CONFIG_SMP */
1044 mpic
->flags
= flags
;
1045 mpic
->isu_size
= isu_size
;
1046 mpic
->irq_count
= irq_count
;
1047 mpic
->num_sources
= 0; /* so far */
1049 if (flags
& MPIC_LARGE_VECTORS
)
1054 mpic
->timer_vecs
[0] = intvec_top
- 8;
1055 mpic
->timer_vecs
[1] = intvec_top
- 7;
1056 mpic
->timer_vecs
[2] = intvec_top
- 6;
1057 mpic
->timer_vecs
[3] = intvec_top
- 5;
1058 mpic
->ipi_vecs
[0] = intvec_top
- 4;
1059 mpic
->ipi_vecs
[1] = intvec_top
- 3;
1060 mpic
->ipi_vecs
[2] = intvec_top
- 2;
1061 mpic
->ipi_vecs
[3] = intvec_top
- 1;
1062 mpic
->spurious_vec
= intvec_top
;
1064 /* Check for "big-endian" in device-tree */
1065 if (node
&& of_get_property(node
, "big-endian", NULL
) != NULL
)
1066 mpic
->flags
|= MPIC_BIG_ENDIAN
;
1068 /* Look for protected sources */
1071 unsigned int bits
, mapsize
;
1073 of_get_property(node
, "protected-sources", &psize
);
1076 bits
= intvec_top
+ 1;
1077 mapsize
= BITS_TO_LONGS(bits
) * sizeof(unsigned long);
1078 mpic
->protected = alloc_bootmem(mapsize
);
1079 BUG_ON(mpic
->protected == NULL
);
1080 memset(mpic
->protected, 0, mapsize
);
1081 for (i
= 0; i
< psize
; i
++) {
1082 if (psrc
[i
] > intvec_top
)
1084 __set_bit(psrc
[i
], mpic
->protected);
1089 #ifdef CONFIG_MPIC_WEIRD
1090 mpic
->hw_set
= mpic_infos
[MPIC_GET_REGSET(flags
)];
1093 /* default register type */
1094 mpic
->reg_type
= (flags
& MPIC_BIG_ENDIAN
) ?
1095 mpic_access_mmio_be
: mpic_access_mmio_le
;
1097 /* If no physical address is passed in, a device-node is mandatory */
1098 BUG_ON(paddr
== 0 && node
== NULL
);
1100 /* If no physical address passed in, check if it's dcr based */
1101 if (paddr
== 0 && of_get_property(node
, "dcr-reg", NULL
) != NULL
) {
1102 #ifdef CONFIG_PPC_DCR
1103 mpic
->flags
|= MPIC_USES_DCR
;
1104 mpic
->reg_type
= mpic_access_dcr
;
1107 #endif /* CONFIG_PPC_DCR */
1110 /* If the MPIC is not DCR based, and no physical address was passed
1111 * in, try to obtain one
1113 if (paddr
== 0 && !(mpic
->flags
& MPIC_USES_DCR
)) {
1114 const u32
*reg
= of_get_property(node
, "reg", NULL
);
1115 BUG_ON(reg
== NULL
);
1116 paddr
= of_translate_address(node
, reg
);
1117 BUG_ON(paddr
== OF_BAD_ADDR
);
1120 /* Map the global registers */
1121 mpic_map(mpic
, paddr
, &mpic
->gregs
, MPIC_INFO(GREG_BASE
), 0x1000);
1122 mpic_map(mpic
, paddr
, &mpic
->tmregs
, MPIC_INFO(TIMER_BASE
), 0x1000);
1125 if (flags
& MPIC_WANTS_RESET
) {
1126 mpic_write(mpic
->gregs
, MPIC_INFO(GREG_GLOBAL_CONF_0
),
1127 mpic_read(mpic
->gregs
, MPIC_INFO(GREG_GLOBAL_CONF_0
))
1128 | MPIC_GREG_GCONF_RESET
);
1129 while( mpic_read(mpic
->gregs
, MPIC_INFO(GREG_GLOBAL_CONF_0
))
1130 & MPIC_GREG_GCONF_RESET
)
1134 if (flags
& MPIC_ENABLE_MCK
)
1135 mpic_write(mpic
->gregs
, MPIC_INFO(GREG_GLOBAL_CONF_0
),
1136 mpic_read(mpic
->gregs
, MPIC_INFO(GREG_GLOBAL_CONF_0
))
1137 | MPIC_GREG_GCONF_MCK
);
1139 /* Read feature register, calculate num CPUs and, for non-ISU
1140 * MPICs, num sources as well. On ISU MPICs, sources are counted
1143 greg_feature
= mpic_read(mpic
->gregs
, MPIC_INFO(GREG_FEATURE_0
));
1144 mpic
->num_cpus
= ((greg_feature
& MPIC_GREG_FEATURE_LAST_CPU_MASK
)
1145 >> MPIC_GREG_FEATURE_LAST_CPU_SHIFT
) + 1;
1147 if (flags
& MPIC_BROKEN_FRR_NIRQS
)
1148 mpic
->num_sources
= mpic
->irq_count
;
1151 ((greg_feature
& MPIC_GREG_FEATURE_LAST_SRC_MASK
)
1152 >> MPIC_GREG_FEATURE_LAST_SRC_SHIFT
) + 1;
1154 /* Map the per-CPU registers */
1155 for (i
= 0; i
< mpic
->num_cpus
; i
++) {
1156 mpic_map(mpic
, paddr
, &mpic
->cpuregs
[i
],
1157 MPIC_INFO(CPU_BASE
) + i
* MPIC_INFO(CPU_STRIDE
),
1161 /* Initialize main ISU if none provided */
1162 if (mpic
->isu_size
== 0) {
1163 mpic
->isu_size
= mpic
->num_sources
;
1164 mpic_map(mpic
, paddr
, &mpic
->isus
[0],
1165 MPIC_INFO(IRQ_BASE
), MPIC_INFO(IRQ_STRIDE
) * mpic
->isu_size
);
1167 mpic
->isu_shift
= 1 + __ilog2(mpic
->isu_size
- 1);
1168 mpic
->isu_mask
= (1 << mpic
->isu_shift
) - 1;
1170 /* Display version */
1171 switch (greg_feature
& MPIC_GREG_FEATURE_VERSION_MASK
) {
1185 printk(KERN_INFO
"mpic: Setting up MPIC \"%s\" version %s at %llx,"
1187 name
, vers
, (unsigned long long)paddr
, mpic
->num_cpus
);
1188 printk(KERN_INFO
"mpic: ISU size: %d, shift: %d, mask: %x\n",
1189 mpic
->isu_size
, mpic
->isu_shift
, mpic
->isu_mask
);
1194 if (flags
& MPIC_PRIMARY
) {
1195 mpic_primary
= mpic
;
1196 irq_set_default_host(mpic
->irqhost
);
1202 void __init
mpic_assign_isu(struct mpic
*mpic
, unsigned int isu_num
,
1205 unsigned int isu_first
= isu_num
* mpic
->isu_size
;
1207 BUG_ON(isu_num
>= MPIC_MAX_ISU
);
1209 mpic_map(mpic
, paddr
, &mpic
->isus
[isu_num
], 0,
1210 MPIC_INFO(IRQ_STRIDE
) * mpic
->isu_size
);
1211 if ((isu_first
+ mpic
->isu_size
) > mpic
->num_sources
)
1212 mpic
->num_sources
= isu_first
+ mpic
->isu_size
;
1215 void __init
mpic_set_default_senses(struct mpic
*mpic
, u8
*senses
, int count
)
1217 mpic
->senses
= senses
;
1218 mpic
->senses_count
= count
;
1221 void __init
mpic_init(struct mpic
*mpic
)
1225 BUG_ON(mpic
->num_sources
== 0);
1227 printk(KERN_INFO
"mpic: Initializing for %d sources\n", mpic
->num_sources
);
1229 /* Set current processor priority to max */
1230 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI
), 0xf);
1232 /* Initialize timers: just disable them all */
1233 for (i
= 0; i
< 4; i
++) {
1234 mpic_write(mpic
->tmregs
,
1235 i
* MPIC_INFO(TIMER_STRIDE
) +
1236 MPIC_INFO(TIMER_DESTINATION
), 0);
1237 mpic_write(mpic
->tmregs
,
1238 i
* MPIC_INFO(TIMER_STRIDE
) +
1239 MPIC_INFO(TIMER_VECTOR_PRI
),
1241 (mpic
->timer_vecs
[0] + i
));
1244 /* Initialize IPIs to our reserved vectors and mark them disabled for now */
1245 mpic_test_broken_ipi(mpic
);
1246 for (i
= 0; i
< 4; i
++) {
1249 (10 << MPIC_VECPRI_PRIORITY_SHIFT
) |
1250 (mpic
->ipi_vecs
[0] + i
));
1253 /* Initialize interrupt sources */
1254 if (mpic
->irq_count
== 0)
1255 mpic
->irq_count
= mpic
->num_sources
;
1257 /* Do the HT PIC fixups on U3 broken mpic */
1258 DBG("MPIC flags: %x\n", mpic
->flags
);
1259 if ((mpic
->flags
& MPIC_U3_HT_IRQS
) && (mpic
->flags
& MPIC_PRIMARY
)) {
1260 mpic_scan_ht_pics(mpic
);
1261 mpic_u3msi_init(mpic
);
1264 mpic_pasemi_msi_init(mpic
);
1266 for (i
= 0; i
< mpic
->num_sources
; i
++) {
1267 /* start with vector = source number, and masked */
1268 u32 vecpri
= MPIC_VECPRI_MASK
| i
|
1269 (8 << MPIC_VECPRI_PRIORITY_SHIFT
);
1271 /* check if protected */
1272 if (mpic
->protected && test_bit(i
, mpic
->protected))
1275 mpic_irq_write(i
, MPIC_INFO(IRQ_VECTOR_PRI
), vecpri
);
1276 mpic_irq_write(i
, MPIC_INFO(IRQ_DESTINATION
),
1277 1 << hard_smp_processor_id());
1280 /* Init spurious vector */
1281 mpic_write(mpic
->gregs
, MPIC_INFO(GREG_SPURIOUS
), mpic
->spurious_vec
);
1283 /* Disable 8259 passthrough, if supported */
1284 if (!(mpic
->flags
& MPIC_NO_PTHROU_DIS
))
1285 mpic_write(mpic
->gregs
, MPIC_INFO(GREG_GLOBAL_CONF_0
),
1286 mpic_read(mpic
->gregs
, MPIC_INFO(GREG_GLOBAL_CONF_0
))
1287 | MPIC_GREG_GCONF_8259_PTHROU_DIS
);
1289 if (mpic
->flags
& MPIC_NO_BIAS
)
1290 mpic_write(mpic
->gregs
, MPIC_INFO(GREG_GLOBAL_CONF_0
),
1291 mpic_read(mpic
->gregs
, MPIC_INFO(GREG_GLOBAL_CONF_0
))
1292 | MPIC_GREG_GCONF_NO_BIAS
);
1294 /* Set current processor priority to 0 */
1295 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI
), 0);
1298 /* allocate memory to save mpic state */
1299 mpic
->save_data
= alloc_bootmem(mpic
->num_sources
* sizeof(struct mpic_irq_save
));
1300 BUG_ON(mpic
->save_data
== NULL
);
1304 void __init
mpic_set_clk_ratio(struct mpic
*mpic
, u32 clock_ratio
)
1308 v
= mpic_read(mpic
->gregs
, MPIC_GREG_GLOBAL_CONF_1
);
1309 v
&= ~MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO_MASK
;
1310 v
|= MPIC_GREG_GLOBAL_CONF_1_CLK_RATIO(clock_ratio
);
1311 mpic_write(mpic
->gregs
, MPIC_GREG_GLOBAL_CONF_1
, v
);
1314 void __init
mpic_set_serial_int(struct mpic
*mpic
, int enable
)
1316 unsigned long flags
;
1319 spin_lock_irqsave(&mpic_lock
, flags
);
1320 v
= mpic_read(mpic
->gregs
, MPIC_GREG_GLOBAL_CONF_1
);
1322 v
|= MPIC_GREG_GLOBAL_CONF_1_SIE
;
1324 v
&= ~MPIC_GREG_GLOBAL_CONF_1_SIE
;
1325 mpic_write(mpic
->gregs
, MPIC_GREG_GLOBAL_CONF_1
, v
);
1326 spin_unlock_irqrestore(&mpic_lock
, flags
);
1329 void mpic_irq_set_priority(unsigned int irq
, unsigned int pri
)
1331 unsigned int is_ipi
;
1332 struct mpic
*mpic
= mpic_find(irq
, &is_ipi
);
1333 unsigned int src
= mpic_irq_to_hw(irq
);
1334 unsigned long flags
;
1340 spin_lock_irqsave(&mpic_lock
, flags
);
1342 reg
= mpic_ipi_read(src
- mpic
->ipi_vecs
[0]) &
1343 ~MPIC_VECPRI_PRIORITY_MASK
;
1344 mpic_ipi_write(src
- mpic
->ipi_vecs
[0],
1345 reg
| (pri
<< MPIC_VECPRI_PRIORITY_SHIFT
));
1347 reg
= mpic_irq_read(src
, MPIC_INFO(IRQ_VECTOR_PRI
))
1348 & ~MPIC_VECPRI_PRIORITY_MASK
;
1349 mpic_irq_write(src
, MPIC_INFO(IRQ_VECTOR_PRI
),
1350 reg
| (pri
<< MPIC_VECPRI_PRIORITY_SHIFT
));
1352 spin_unlock_irqrestore(&mpic_lock
, flags
);
1355 void mpic_setup_this_cpu(void)
1358 struct mpic
*mpic
= mpic_primary
;
1359 unsigned long flags
;
1360 u32 msk
= 1 << hard_smp_processor_id();
1363 BUG_ON(mpic
== NULL
);
1365 DBG("%s: setup_this_cpu(%d)\n", mpic
->name
, hard_smp_processor_id());
1367 spin_lock_irqsave(&mpic_lock
, flags
);
1369 /* let the mpic know we want intrs. default affinity is 0xffffffff
1370 * until changed via /proc. That's how it's done on x86. If we want
1371 * it differently, then we should make sure we also change the default
1372 * values of irq_desc[].affinity in irq.c.
1374 if (distribute_irqs
) {
1375 for (i
= 0; i
< mpic
->num_sources
; i
++)
1376 mpic_irq_write(i
, MPIC_INFO(IRQ_DESTINATION
),
1377 mpic_irq_read(i
, MPIC_INFO(IRQ_DESTINATION
)) | msk
);
1380 /* Set current processor priority to 0 */
1381 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI
), 0);
1383 spin_unlock_irqrestore(&mpic_lock
, flags
);
1384 #endif /* CONFIG_SMP */
1387 int mpic_cpu_get_priority(void)
1389 struct mpic
*mpic
= mpic_primary
;
1391 return mpic_cpu_read(MPIC_INFO(CPU_CURRENT_TASK_PRI
));
1394 void mpic_cpu_set_priority(int prio
)
1396 struct mpic
*mpic
= mpic_primary
;
1398 prio
&= MPIC_CPU_TASKPRI_MASK
;
1399 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI
), prio
);
1402 void mpic_teardown_this_cpu(int secondary
)
1404 struct mpic
*mpic
= mpic_primary
;
1405 unsigned long flags
;
1406 u32 msk
= 1 << hard_smp_processor_id();
1409 BUG_ON(mpic
== NULL
);
1411 DBG("%s: teardown_this_cpu(%d)\n", mpic
->name
, hard_smp_processor_id());
1412 spin_lock_irqsave(&mpic_lock
, flags
);
1414 /* let the mpic know we don't want intrs. */
1415 for (i
= 0; i
< mpic
->num_sources
; i
++)
1416 mpic_irq_write(i
, MPIC_INFO(IRQ_DESTINATION
),
1417 mpic_irq_read(i
, MPIC_INFO(IRQ_DESTINATION
)) & ~msk
);
1419 /* Set current processor priority to max */
1420 mpic_cpu_write(MPIC_INFO(CPU_CURRENT_TASK_PRI
), 0xf);
1421 /* We need to EOI the IPI since not all platforms reset the MPIC
1422 * on boot and new interrupts wouldn't get delivered otherwise.
1426 spin_unlock_irqrestore(&mpic_lock
, flags
);
1430 void mpic_send_ipi(unsigned int ipi_no
, unsigned int cpu_mask
)
1432 struct mpic
*mpic
= mpic_primary
;
1434 BUG_ON(mpic
== NULL
);
1437 DBG("%s: send_ipi(ipi_no: %d)\n", mpic
->name
, ipi_no
);
1440 mpic_cpu_write(MPIC_INFO(CPU_IPI_DISPATCH_0
) +
1441 ipi_no
* MPIC_INFO(CPU_IPI_DISPATCH_STRIDE
),
1442 mpic_physmask(cpu_mask
& cpus_addr(cpu_online_map
)[0]));
1445 static unsigned int _mpic_get_one_irq(struct mpic
*mpic
, int reg
)
1449 src
= mpic_cpu_read(reg
) & MPIC_INFO(VECPRI_VECTOR_MASK
);
1451 DBG("%s: get_one_irq(reg 0x%x): %d\n", mpic
->name
, reg
, src
);
1453 if (unlikely(src
== mpic
->spurious_vec
)) {
1454 if (mpic
->flags
& MPIC_SPV_EOI
)
1458 if (unlikely(mpic
->protected && test_bit(src
, mpic
->protected))) {
1459 if (printk_ratelimit())
1460 printk(KERN_WARNING
"%s: Got protected source %d !\n",
1461 mpic
->name
, (int)src
);
1466 return irq_linear_revmap(mpic
->irqhost
, src
);
1469 unsigned int mpic_get_one_irq(struct mpic
*mpic
)
1471 return _mpic_get_one_irq(mpic
, MPIC_INFO(CPU_INTACK
));
1474 unsigned int mpic_get_irq(void)
1476 struct mpic
*mpic
= mpic_primary
;
1478 BUG_ON(mpic
== NULL
);
1480 return mpic_get_one_irq(mpic
);
1483 unsigned int mpic_get_mcirq(void)
1485 struct mpic
*mpic
= mpic_primary
;
1487 BUG_ON(mpic
== NULL
);
1489 return _mpic_get_one_irq(mpic
, MPIC_INFO(CPU_MCACK
));
1493 void mpic_request_ipis(void)
1495 struct mpic
*mpic
= mpic_primary
;
1497 static char *ipi_names
[] = {
1498 "IPI0 (call function)",
1499 "IPI1 (reschedule)",
1501 "IPI3 (debugger break)",
1503 BUG_ON(mpic
== NULL
);
1505 printk(KERN_INFO
"mpic: requesting IPIs ... \n");
1507 for (i
= 0; i
< 4; i
++) {
1508 unsigned int vipi
= irq_create_mapping(mpic
->irqhost
,
1509 mpic
->ipi_vecs
[0] + i
);
1510 if (vipi
== NO_IRQ
) {
1511 printk(KERN_ERR
"Failed to map IPI %ld\n", i
);
1514 err
= request_irq(vipi
, mpic_ipi_action
,
1515 IRQF_DISABLED
|IRQF_PERCPU
,
1516 ipi_names
[i
], (void *)i
);
1518 printk(KERN_ERR
"Request of irq %d for IPI %ld failed\n",
1525 void smp_mpic_message_pass(int target
, int msg
)
1527 /* make sure we're sending something that translates to an IPI */
1528 if ((unsigned int)msg
> 3) {
1529 printk("SMP %d: smp_message_pass: unknown msg %d\n",
1530 smp_processor_id(), msg
);
1535 mpic_send_ipi(msg
, 0xffffffff);
1537 case MSG_ALL_BUT_SELF
:
1538 mpic_send_ipi(msg
, 0xffffffff & ~(1 << smp_processor_id()));
1541 mpic_send_ipi(msg
, 1 << target
);
1546 int __init
smp_mpic_probe(void)
1550 DBG("smp_mpic_probe()...\n");
1552 nr_cpus
= cpus_weight(cpu_possible_map
);
1554 DBG("nr_cpus: %d\n", nr_cpus
);
1557 mpic_request_ipis();
1562 void __devinit
smp_mpic_setup_cpu(int cpu
)
1564 mpic_setup_this_cpu();
1566 #endif /* CONFIG_SMP */
1569 static int mpic_suspend(struct sys_device
*dev
, pm_message_t state
)
1571 struct mpic
*mpic
= container_of(dev
, struct mpic
, sysdev
);
1574 for (i
= 0; i
< mpic
->num_sources
; i
++) {
1575 mpic
->save_data
[i
].vecprio
=
1576 mpic_irq_read(i
, MPIC_INFO(IRQ_VECTOR_PRI
));
1577 mpic
->save_data
[i
].dest
=
1578 mpic_irq_read(i
, MPIC_INFO(IRQ_DESTINATION
));
1584 static int mpic_resume(struct sys_device
*dev
)
1586 struct mpic
*mpic
= container_of(dev
, struct mpic
, sysdev
);
1589 for (i
= 0; i
< mpic
->num_sources
; i
++) {
1590 mpic_irq_write(i
, MPIC_INFO(IRQ_VECTOR_PRI
),
1591 mpic
->save_data
[i
].vecprio
);
1592 mpic_irq_write(i
, MPIC_INFO(IRQ_DESTINATION
),
1593 mpic
->save_data
[i
].dest
);
1595 #ifdef CONFIG_MPIC_U3_HT_IRQS
1597 struct mpic_irq_fixup
*fixup
= &mpic
->fixups
[i
];
1600 /* we use the lowest bit in an inverted meaning */
1601 if ((mpic
->save_data
[i
].fixup_data
& 1) == 0)
1604 /* Enable and configure */
1605 writeb(0x10 + 2 * fixup
->index
, fixup
->base
+ 2);
1607 writel(mpic
->save_data
[i
].fixup_data
& ~1,
1612 } /* end for loop */
1618 static struct sysdev_class mpic_sysclass
= {
1620 .resume
= mpic_resume
,
1621 .suspend
= mpic_suspend
,
1626 static int mpic_init_sys(void)
1628 struct mpic
*mpic
= mpics
;
1631 error
= sysdev_class_register(&mpic_sysclass
);
1633 while (mpic
&& !error
) {
1634 mpic
->sysdev
.cls
= &mpic_sysclass
;
1635 mpic
->sysdev
.id
= id
++;
1636 error
= sysdev_register(&mpic
->sysdev
);
1642 device_initcall(mpic_init_sys
);