2 * Celleb/Beat Interrupt controller
4 * (C) Copyright 2006-2007 TOSHIBA CORPORATION
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License along
17 * with this program; if not, write to the Free Software Foundation, Inc.,
18 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 #include <linux/init.h>
22 #include <linux/interrupt.h>
23 #include <linux/irq.h>
24 #include <linux/percpu.h>
25 #include <linux/types.h>
27 #include <asm/machdep.h>
29 #include "beat_interrupt.h"
30 #include "beat_wrapper.h"
32 #define MAX_IRQS NR_IRQS
33 static DEFINE_RAW_SPINLOCK(beatic_irq_mask_lock
);
34 static uint64_t beatic_irq_mask_enable
[(MAX_IRQS
+255)/64];
35 static uint64_t beatic_irq_mask_ack
[(MAX_IRQS
+255)/64];
37 static struct irq_host
*beatic_host
;
40 * In this implementation, "virq" == "IRQ plug number",
41 * "(irq_hw_number_t)hwirq" == "IRQ outlet number".
44 /* assumption: locked */
45 static inline void beatic_update_irq_mask(unsigned int irq_plug
)
48 unsigned long masks
[4];
50 off
= (irq_plug
/ 256) * 4;
51 masks
[0] = beatic_irq_mask_enable
[off
+ 0]
52 & beatic_irq_mask_ack
[off
+ 0];
53 masks
[1] = beatic_irq_mask_enable
[off
+ 1]
54 & beatic_irq_mask_ack
[off
+ 1];
55 masks
[2] = beatic_irq_mask_enable
[off
+ 2]
56 & beatic_irq_mask_ack
[off
+ 2];
57 masks
[3] = beatic_irq_mask_enable
[off
+ 3]
58 & beatic_irq_mask_ack
[off
+ 3];
59 if (beat_set_interrupt_mask(irq_plug
&~255UL,
60 masks
[0], masks
[1], masks
[2], masks
[3]) != 0)
61 panic("Failed to set mask IRQ!");
64 static void beatic_mask_irq(struct irq_data
*d
)
68 raw_spin_lock_irqsave(&beatic_irq_mask_lock
, flags
);
69 beatic_irq_mask_enable
[d
->irq
/64] &= ~(1UL << (63 - (d
->irq
%64)));
70 beatic_update_irq_mask(d
->irq
);
71 raw_spin_unlock_irqrestore(&beatic_irq_mask_lock
, flags
);
74 static void beatic_unmask_irq(struct irq_data
*d
)
78 raw_spin_lock_irqsave(&beatic_irq_mask_lock
, flags
);
79 beatic_irq_mask_enable
[d
->irq
/64] |= 1UL << (63 - (d
->irq
%64));
80 beatic_update_irq_mask(d
->irq
);
81 raw_spin_unlock_irqrestore(&beatic_irq_mask_lock
, flags
);
84 static void beatic_ack_irq(struct irq_data
*d
)
88 raw_spin_lock_irqsave(&beatic_irq_mask_lock
, flags
);
89 beatic_irq_mask_ack
[d
->irq
/64] &= ~(1UL << (63 - (d
->irq
%64)));
90 beatic_update_irq_mask(d
->irq
);
91 raw_spin_unlock_irqrestore(&beatic_irq_mask_lock
, flags
);
94 static void beatic_end_irq(struct irq_data
*d
)
99 err
= beat_downcount_of_interrupt(d
->irq
);
101 if ((err
& 0xFFFFFFFF) != 0xFFFFFFF5) /* -11: wrong state */
102 panic("Failed to downcount IRQ! Error = %16llx", err
);
104 printk(KERN_ERR
"IRQ over-downcounted, plug %d\n", d
->irq
);
106 raw_spin_lock_irqsave(&beatic_irq_mask_lock
, flags
);
107 beatic_irq_mask_ack
[d
->irq
/64] |= 1UL << (63 - (d
->irq
%64));
108 beatic_update_irq_mask(d
->irq
);
109 raw_spin_unlock_irqrestore(&beatic_irq_mask_lock
, flags
);
112 static struct irq_chip beatic_pic
= {
114 .irq_unmask
= beatic_unmask_irq
,
115 .irq_mask
= beatic_mask_irq
,
116 .irq_eoi
= beatic_end_irq
,
120 * Dispose binding hardware IRQ number (hw) and Virtuql IRQ number (virq),
123 * Note that the number (virq) is already assigned at upper layer.
125 static void beatic_pic_host_unmap(struct irq_host
*h
, unsigned int virq
)
127 beat_destruct_irq_plug(virq
);
131 * Create or update binding hardware IRQ number (hw) and Virtuql
132 * IRQ number (virq). This is called only once for a given mapping.
134 * Note that the number (virq) is already assigned at upper layer.
136 static int beatic_pic_host_map(struct irq_host
*h
, unsigned int virq
,
141 err
= beat_construct_and_connect_irq_plug(virq
, hw
);
145 irq_set_status_flags(virq
, IRQ_LEVEL
);
146 irq_set_chip_and_handler(virq
, &beatic_pic
, handle_fasteoi_irq
);
151 * Update binding hardware IRQ number (hw) and Virtuql
152 * IRQ number (virq). This is called only once for a given mapping.
154 static void beatic_pic_host_remap(struct irq_host
*h
, unsigned int virq
,
157 beat_construct_and_connect_irq_plug(virq
, hw
);
161 * Translate device-tree interrupt spec to irq_hw_number_t style (ulong),
162 * to pass away to irq_create_mapping().
164 * Called from irq_create_of_mapping() only.
165 * Note: We have only 1 entry to translate.
167 static int beatic_pic_host_xlate(struct irq_host
*h
, struct device_node
*ct
,
168 const u32
*intspec
, unsigned int intsize
,
169 irq_hw_number_t
*out_hwirq
,
170 unsigned int *out_flags
)
172 const u64
*intspec2
= (const u64
*)intspec
;
174 *out_hwirq
= *intspec2
;
175 *out_flags
|= IRQ_TYPE_LEVEL_LOW
;
179 static int beatic_pic_host_match(struct irq_host
*h
, struct device_node
*np
)
185 static struct irq_host_ops beatic_pic_host_ops
= {
186 .map
= beatic_pic_host_map
,
187 .remap
= beatic_pic_host_remap
,
188 .unmap
= beatic_pic_host_unmap
,
189 .xlate
= beatic_pic_host_xlate
,
190 .match
= beatic_pic_host_match
,
197 static inline unsigned int beatic_get_irq_plug(void)
200 uint64_t pending
[4], ub
;
202 for (i
= 0; i
< MAX_IRQS
; i
+= 256) {
203 beat_detect_pending_interrupts(i
, pending
);
204 __asm__ ("cntlzd %0,%1":"=r"(ub
):
205 "r"(pending
[0] & beatic_irq_mask_enable
[i
/64+0]
206 & beatic_irq_mask_ack
[i
/64+0]));
209 __asm__ ("cntlzd %0,%1":"=r"(ub
):
210 "r"(pending
[1] & beatic_irq_mask_enable
[i
/64+1]
211 & beatic_irq_mask_ack
[i
/64+1]));
214 __asm__ ("cntlzd %0,%1":"=r"(ub
):
215 "r"(pending
[2] & beatic_irq_mask_enable
[i
/64+2]
216 & beatic_irq_mask_ack
[i
/64+2]));
219 __asm__ ("cntlzd %0,%1":"=r"(ub
):
220 "r"(pending
[3] & beatic_irq_mask_enable
[i
/64+3]
221 & beatic_irq_mask_ack
[i
/64+3]));
228 unsigned int beatic_get_irq(void)
232 ret
= beatic_get_irq_plug();
234 beatic_ack_irq(irq_get_irq_data(ret
));
240 void __init
beatic_init_IRQ(void)
244 memset(beatic_irq_mask_enable
, 0, sizeof(beatic_irq_mask_enable
));
245 memset(beatic_irq_mask_ack
, 255, sizeof(beatic_irq_mask_ack
));
246 for (i
= 0; i
< MAX_IRQS
; i
+= 256)
247 beat_set_interrupt_mask(i
, 0L, 0L, 0L, 0L);
249 /* Set out get_irq function */
250 ppc_md
.get_irq
= beatic_get_irq
;
252 /* Allocate an irq host */
253 beatic_host
= irq_alloc_host(NULL
, IRQ_HOST_MAP_NOMAP
, 0,
254 &beatic_pic_host_ops
,
256 BUG_ON(beatic_host
== NULL
);
257 irq_set_default_host(beatic_host
);
262 /* Nullified to compile with SMP mode */
263 void beatic_setup_cpu(int cpu
)
267 void beatic_cause_IPI(int cpu
, int mesg
)
271 void beatic_request_IPIs(void)
274 #endif /* CONFIG_SMP */
276 void beatic_deinit_IRQ(void)
280 for (i
= 1; i
< NR_IRQS
; i
++)
281 beat_destruct_irq_plug(i
);