powerpc: Convert to new irq_* function names
[linux-2.6.git] / arch / powerpc / platforms / cell / beat_interrupt.c
1 /*
2  * Celleb/Beat Interrupt controller
3  *
4  * (C) Copyright 2006-2007 TOSHIBA CORPORATION
5  *
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.
10  *
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.
15  *
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.
19  */
20
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>
26
27 #include <asm/machdep.h>
28
29 #include "beat_interrupt.h"
30 #include "beat_wrapper.h"
31
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];
36
37 static struct irq_host *beatic_host;
38
39 /*
40  * In this implementation, "virq" == "IRQ plug number",
41  * "(irq_hw_number_t)hwirq" == "IRQ outlet number".
42  */
43
44 /* assumption: locked */
45 static inline void beatic_update_irq_mask(unsigned int irq_plug)
46 {
47         int off;
48         unsigned long masks[4];
49
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!");
62 }
63
64 static void beatic_mask_irq(struct irq_data *d)
65 {
66         unsigned long flags;
67
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);
72 }
73
74 static void beatic_unmask_irq(struct irq_data *d)
75 {
76         unsigned long flags;
77
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);
82 }
83
84 static void beatic_ack_irq(struct irq_data *d)
85 {
86         unsigned long flags;
87
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);
92 }
93
94 static void beatic_end_irq(struct irq_data *d)
95 {
96         s64 err;
97         unsigned long flags;
98
99         err = beat_downcount_of_interrupt(d->irq);
100         if (err != 0) {
101                 if ((err & 0xFFFFFFFF) != 0xFFFFFFF5) /* -11: wrong state */
102                         panic("Failed to downcount IRQ! Error = %16llx", err);
103
104                 printk(KERN_ERR "IRQ over-downcounted, plug %d\n", d->irq);
105         }
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);
110 }
111
112 static struct irq_chip beatic_pic = {
113         .name = "CELL-BEAT",
114         .irq_unmask = beatic_unmask_irq,
115         .irq_mask = beatic_mask_irq,
116         .irq_eoi = beatic_end_irq,
117 };
118
119 /*
120  * Dispose binding hardware IRQ number (hw) and Virtuql IRQ number (virq),
121  * update flags.
122  *
123  * Note that the number (virq) is already assigned at upper layer.
124  */
125 static void beatic_pic_host_unmap(struct irq_host *h, unsigned int virq)
126 {
127         beat_destruct_irq_plug(virq);
128 }
129
130 /*
131  * Create or update binding hardware IRQ number (hw) and Virtuql
132  * IRQ number (virq). This is called only once for a given mapping.
133  *
134  * Note that the number (virq) is already assigned at upper layer.
135  */
136 static int beatic_pic_host_map(struct irq_host *h, unsigned int virq,
137                                irq_hw_number_t hw)
138 {
139         int64_t err;
140
141         err = beat_construct_and_connect_irq_plug(virq, hw);
142         if (err < 0)
143                 return -EIO;
144
145         irq_set_status_flags(virq, IRQ_LEVEL);
146         irq_set_chip_and_handler(virq, &beatic_pic, handle_fasteoi_irq);
147         return 0;
148 }
149
150 /*
151  * Update binding hardware IRQ number (hw) and Virtuql
152  * IRQ number (virq). This is called only once for a given mapping.
153  */
154 static void beatic_pic_host_remap(struct irq_host *h, unsigned int virq,
155                                irq_hw_number_t hw)
156 {
157         beat_construct_and_connect_irq_plug(virq, hw);
158 }
159
160 /*
161  * Translate device-tree interrupt spec to irq_hw_number_t style (ulong),
162  * to pass away to irq_create_mapping().
163  *
164  * Called from irq_create_of_mapping() only.
165  * Note: We have only 1 entry to translate.
166  */
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)
171 {
172         const u64 *intspec2 = (const u64 *)intspec;
173
174         *out_hwirq = *intspec2;
175         *out_flags |= IRQ_TYPE_LEVEL_LOW;
176         return 0;
177 }
178
179 static int beatic_pic_host_match(struct irq_host *h, struct device_node *np)
180 {
181         /* Match all */
182         return 1;
183 }
184
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,
191 };
192
193 /*
194  * Get an IRQ number
195  * Note: returns VIRQ
196  */
197 static inline unsigned int beatic_get_irq_plug(void)
198 {
199         int i;
200         uint64_t        pending[4], ub;
201
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]));
207                 if (ub != 64)
208                         return i + ub + 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]));
212                 if (ub != 64)
213                         return i + ub + 64;
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]));
217                 if (ub != 64)
218                         return i + ub + 128;
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]));
222                 if (ub != 64)
223                         return i + ub + 192;
224         }
225
226         return NO_IRQ;
227 }
228 unsigned int beatic_get_irq(void)
229 {
230         unsigned int ret;
231
232         ret = beatic_get_irq_plug();
233         if (ret != NO_IRQ)
234                 beatic_ack_irq(irq_get_irq_data(ret));
235         return ret;
236 }
237
238 /*
239  */
240 void __init beatic_init_IRQ(void)
241 {
242         int     i;
243
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);
248
249         /* Set out get_irq function */
250         ppc_md.get_irq = beatic_get_irq;
251
252         /* Allocate an irq host */
253         beatic_host = irq_alloc_host(NULL, IRQ_HOST_MAP_NOMAP, 0,
254                                      &beatic_pic_host_ops,
255                                          0);
256         BUG_ON(beatic_host == NULL);
257         irq_set_default_host(beatic_host);
258 }
259
260 #ifdef CONFIG_SMP
261
262 /* Nullified to compile with SMP mode */
263 void beatic_setup_cpu(int cpu)
264 {
265 }
266
267 void beatic_cause_IPI(int cpu, int mesg)
268 {
269 }
270
271 void beatic_request_IPIs(void)
272 {
273 }
274 #endif /* CONFIG_SMP */
275
276 void beatic_deinit_IRQ(void)
277 {
278         int     i;
279
280         for (i = 1; i < NR_IRQS; i++)
281                 beat_destruct_irq_plug(i);
282 }