[PATCH] powerpc: irq change build breaks
[linux-2.6] / arch / powerpc / platforms / cell / interrupt.c
1 /*
2  * Cell Internal Interrupt Controller
3  *
4  * Copyright (C) 2006 Benjamin Herrenschmidt (benh@kernel.crashing.org)
5  *                    IBM, Corp.
6  *
7  * (C) Copyright IBM Deutschland Entwicklung GmbH 2005
8  *
9  * Author: Arnd Bergmann <arndb@de.ibm.com>
10  *
11  * This program is free software; you can redistribute it and/or modify
12  * it under the terms of the GNU General Public License as published by
13  * the Free Software Foundation; either version 2, or (at your option)
14  * any later version.
15  *
16  * This program is distributed in the hope that it will be useful,
17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
19  * GNU General Public License for more details.
20  *
21  * You should have received a copy of the GNU General Public License
22  * along with this program; if not, write to the Free Software
23  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24  *
25  * TODO:
26  * - Fix various assumptions related to HW CPU numbers vs. linux CPU numbers
27  *   vs node numbers in the setup code
28  * - Implement proper handling of maxcpus=1/2 (that is, routing of irqs from
29  *   a non-active node to the active node)
30  */
31
32 #include <linux/interrupt.h>
33 #include <linux/irq.h>
34 #include <linux/module.h>
35 #include <linux/percpu.h>
36 #include <linux/types.h>
37 #include <linux/ioport.h>
38
39 #include <asm/io.h>
40 #include <asm/pgtable.h>
41 #include <asm/prom.h>
42 #include <asm/ptrace.h>
43 #include <asm/machdep.h>
44
45 #include "interrupt.h"
46 #include "cbe_regs.h"
47
48 struct iic {
49         struct cbe_iic_thread_regs __iomem *regs;
50         u8 target_id;
51         u8 eoi_stack[16];
52         int eoi_ptr;
53         struct device_node *node;
54 };
55
56 static DEFINE_PER_CPU(struct iic, iic);
57 #define IIC_NODE_COUNT  2
58 static struct irq_host *iic_host;
59
60 /* Convert between "pending" bits and hw irq number */
61 static irq_hw_number_t iic_pending_to_hwnum(struct cbe_iic_pending_bits bits)
62 {
63         unsigned char unit = bits.source & 0xf;
64         unsigned char node = bits.source >> 4;
65         unsigned char class = bits.class & 3;
66
67         /* Decode IPIs */
68         if (bits.flags & CBE_IIC_IRQ_IPI)
69                 return IIC_IRQ_TYPE_IPI | (bits.prio >> 4);
70         else
71                 return (node << IIC_IRQ_NODE_SHIFT) | (class << 4) | unit;
72 }
73
74 static void iic_mask(unsigned int irq)
75 {
76 }
77
78 static void iic_unmask(unsigned int irq)
79 {
80 }
81
82 static void iic_eoi(unsigned int irq)
83 {
84         struct iic *iic = &__get_cpu_var(iic);
85         out_be64(&iic->regs->prio, iic->eoi_stack[--iic->eoi_ptr]);
86         BUG_ON(iic->eoi_ptr < 0);
87 }
88
89 static struct irq_chip iic_chip = {
90         .typename = " CELL-IIC ",
91         .mask = iic_mask,
92         .unmask = iic_unmask,
93         .eoi = iic_eoi,
94 };
95
96
97 static void iic_ioexc_eoi(unsigned int irq)
98 {
99 }
100
101 static void iic_ioexc_cascade(unsigned int irq, struct irq_desc *desc,
102                             struct pt_regs *regs)
103 {
104         struct cbe_iic_regs __iomem *node_iic = (void __iomem *)desc->handler_data;
105         unsigned int base = (irq & 0xffffff00) | IIC_IRQ_TYPE_IOEXC;
106         unsigned long bits, ack;
107         int cascade;
108
109         for (;;) {
110                 bits = in_be64(&node_iic->iic_is);
111                 if (bits == 0)
112                         break;
113                 /* pre-ack edge interrupts */
114                 ack = bits & IIC_ISR_EDGE_MASK;
115                 if (ack)
116                         out_be64(&node_iic->iic_is, ack);
117                 /* handle them */
118                 for (cascade = 63; cascade >= 0; cascade--)
119                         if (bits & (0x8000000000000000UL >> cascade)) {
120                                 unsigned int cirq =
121                                         irq_linear_revmap(iic_host,
122                                                           base | cascade);
123                                 if (cirq != NO_IRQ)
124                                         generic_handle_irq(cirq);
125                         }
126                 /* post-ack level interrupts */
127                 ack = bits & ~IIC_ISR_EDGE_MASK;
128                 if (ack)
129                         out_be64(&node_iic->iic_is, ack);
130         }
131         desc->chip->eoi(irq);
132 }
133
134
135 static struct irq_chip iic_ioexc_chip = {
136         .typename = " CELL-IOEX",
137         .mask = iic_mask,
138         .unmask = iic_unmask,
139         .eoi = iic_ioexc_eoi,
140 };
141
142 /* Get an IRQ number from the pending state register of the IIC */
143 static unsigned int iic_get_irq(struct pt_regs *regs)
144 {
145         struct cbe_iic_pending_bits pending;
146         struct iic *iic;
147         unsigned int virq;
148
149         iic = &__get_cpu_var(iic);
150         *(unsigned long *) &pending =
151                 in_be64((unsigned long __iomem *) &iic->regs->pending_destr);
152         if (!(pending.flags & CBE_IIC_IRQ_VALID))
153                 return NO_IRQ;
154         virq = irq_linear_revmap(iic_host, iic_pending_to_hwnum(pending));
155         if (virq == NO_IRQ)
156                 return NO_IRQ;
157         iic->eoi_stack[++iic->eoi_ptr] = pending.prio;
158         BUG_ON(iic->eoi_ptr > 15);
159         return virq;
160 }
161
162 #ifdef CONFIG_SMP
163
164 /* Use the highest interrupt priorities for IPI */
165 static inline int iic_ipi_to_irq(int ipi)
166 {
167         return IIC_IRQ_TYPE_IPI + 0xf - ipi;
168 }
169
170 void iic_setup_cpu(void)
171 {
172         out_be64(&__get_cpu_var(iic).regs->prio, 0xff);
173 }
174
175 void iic_cause_IPI(int cpu, int mesg)
176 {
177         out_be64(&per_cpu(iic, cpu).regs->generate, (0xf - mesg) << 4);
178 }
179
180 u8 iic_get_target_id(int cpu)
181 {
182         return per_cpu(iic, cpu).target_id;
183 }
184 EXPORT_SYMBOL_GPL(iic_get_target_id);
185
186 struct irq_host *iic_get_irq_host(int node)
187 {
188         return iic_host;
189 }
190 EXPORT_SYMBOL_GPL(iic_get_irq_host);
191
192
193 static irqreturn_t iic_ipi_action(int irq, void *dev_id)
194 {
195         int ipi = (int)(long)dev_id;
196
197         smp_message_recv(ipi);
198
199         return IRQ_HANDLED;
200 }
201 static void iic_request_ipi(int ipi, const char *name)
202 {
203         int virq;
204
205         virq = irq_create_mapping(iic_host, iic_ipi_to_irq(ipi));
206         if (virq == NO_IRQ) {
207                 printk(KERN_ERR
208                        "iic: failed to map IPI %s\n", name);
209                 return;
210         }
211         if (request_irq(virq, iic_ipi_action, IRQF_DISABLED, name,
212                         (void *)(long)ipi))
213                 printk(KERN_ERR
214                        "iic: failed to request IPI %s\n", name);
215 }
216
217 void iic_request_IPIs(void)
218 {
219         iic_request_ipi(PPC_MSG_CALL_FUNCTION, "IPI-call");
220         iic_request_ipi(PPC_MSG_RESCHEDULE, "IPI-resched");
221 #ifdef CONFIG_DEBUGGER
222         iic_request_ipi(PPC_MSG_DEBUGGER_BREAK, "IPI-debug");
223 #endif /* CONFIG_DEBUGGER */
224 }
225
226 #endif /* CONFIG_SMP */
227
228
229 static int iic_host_match(struct irq_host *h, struct device_node *node)
230 {
231         return device_is_compatible(node,
232                                     "IBM,CBEA-Internal-Interrupt-Controller");
233 }
234
235 static int iic_host_map(struct irq_host *h, unsigned int virq,
236                         irq_hw_number_t hw)
237 {
238         switch (hw & IIC_IRQ_TYPE_MASK) {
239         case IIC_IRQ_TYPE_IPI:
240                 set_irq_chip_and_handler(virq, &iic_chip, handle_percpu_irq);
241                 break;
242         case IIC_IRQ_TYPE_IOEXC:
243                 set_irq_chip_and_handler(virq, &iic_ioexc_chip,
244                                          handle_fasteoi_irq);
245                 break;
246         default:
247                 set_irq_chip_and_handler(virq, &iic_chip, handle_fasteoi_irq);
248         }
249         return 0;
250 }
251
252 static int iic_host_xlate(struct irq_host *h, struct device_node *ct,
253                            u32 *intspec, unsigned int intsize,
254                            irq_hw_number_t *out_hwirq, unsigned int *out_flags)
255
256 {
257         unsigned int node, ext, unit, class;
258         const u32 *val;
259
260         if (!device_is_compatible(ct,
261                                      "IBM,CBEA-Internal-Interrupt-Controller"))
262                 return -ENODEV;
263         if (intsize != 1)
264                 return -ENODEV;
265         val = get_property(ct, "#interrupt-cells", NULL);
266         if (val == NULL || *val != 1)
267                 return -ENODEV;
268
269         node = intspec[0] >> 24;
270         ext = (intspec[0] >> 16) & 0xff;
271         class = (intspec[0] >> 8) & 0xff;
272         unit = intspec[0] & 0xff;
273
274         /* Check if node is in supported range */
275         if (node > 1)
276                 return -EINVAL;
277
278         /* Build up interrupt number, special case for IO exceptions */
279         *out_hwirq = (node << IIC_IRQ_NODE_SHIFT);
280         if (unit == IIC_UNIT_IIC && class == 1)
281                 *out_hwirq |= IIC_IRQ_TYPE_IOEXC | ext;
282         else
283                 *out_hwirq |= IIC_IRQ_TYPE_NORMAL |
284                         (class << IIC_IRQ_CLASS_SHIFT) | unit;
285
286         /* Dummy flags, ignored by iic code */
287         *out_flags = IRQ_TYPE_EDGE_RISING;
288
289         return 0;
290 }
291
292 static struct irq_host_ops iic_host_ops = {
293         .match = iic_host_match,
294         .map = iic_host_map,
295         .xlate = iic_host_xlate,
296 };
297
298 static void __init init_one_iic(unsigned int hw_cpu, unsigned long addr,
299                                 struct device_node *node)
300 {
301         /* XXX FIXME: should locate the linux CPU number from the HW cpu
302          * number properly. We are lucky for now
303          */
304         struct iic *iic = &per_cpu(iic, hw_cpu);
305
306         iic->regs = ioremap(addr, sizeof(struct cbe_iic_thread_regs));
307         BUG_ON(iic->regs == NULL);
308
309         iic->target_id = ((hw_cpu & 2) << 3) | ((hw_cpu & 1) ? 0xf : 0xe);
310         iic->eoi_stack[0] = 0xff;
311         iic->node = of_node_get(node);
312         out_be64(&iic->regs->prio, 0);
313
314         printk(KERN_INFO "IIC for CPU %d target id 0x%x : %s\n",
315                hw_cpu, iic->target_id, node->full_name);
316 }
317
318 static int __init setup_iic(void)
319 {
320         struct device_node *dn;
321         struct resource r0, r1;
322         unsigned int node, cascade, found = 0;
323         struct cbe_iic_regs __iomem *node_iic;
324         const u32 *np;
325
326         for (dn = NULL;
327              (dn = of_find_node_by_name(dn,"interrupt-controller")) != NULL;) {
328                 if (!device_is_compatible(dn,
329                                      "IBM,CBEA-Internal-Interrupt-Controller"))
330                         continue;
331                 np = get_property(dn, "ibm,interrupt-server-ranges", NULL);
332                 if (np == NULL) {
333                         printk(KERN_WARNING "IIC: CPU association not found\n");
334                         of_node_put(dn);
335                         return -ENODEV;
336                 }
337                 if (of_address_to_resource(dn, 0, &r0) ||
338                     of_address_to_resource(dn, 1, &r1)) {
339                         printk(KERN_WARNING "IIC: Can't resolve addresses\n");
340                         of_node_put(dn);
341                         return -ENODEV;
342                 }
343                 found++;
344                 init_one_iic(np[0], r0.start, dn);
345                 init_one_iic(np[1], r1.start, dn);
346
347                 /* Setup cascade for IO exceptions. XXX cleanup tricks to get
348                  * node vs CPU etc...
349                  * Note that we configure the IIC_IRR here with a hard coded
350                  * priority of 1. We might want to improve that later.
351                  */
352                 node = np[0] >> 1;
353                 node_iic = cbe_get_cpu_iic_regs(np[0]);
354                 cascade = node << IIC_IRQ_NODE_SHIFT;
355                 cascade |= 1 << IIC_IRQ_CLASS_SHIFT;
356                 cascade |= IIC_UNIT_IIC;
357                 cascade = irq_create_mapping(iic_host, cascade);
358                 if (cascade == NO_IRQ)
359                         continue;
360                 /*
361                  * irq_data is a generic pointer that gets passed back
362                  * to us later, so the forced cast is fine.
363                  */
364                 set_irq_data(cascade, (void __force *)node_iic);
365                 set_irq_chained_handler(cascade , iic_ioexc_cascade);
366                 out_be64(&node_iic->iic_ir,
367                          (1 << 12)              /* priority */ |
368                          (node << 4)            /* dest node */ |
369                          IIC_UNIT_THREAD_0      /* route them to thread 0 */);
370                 /* Flush pending (make sure it triggers if there is
371                  * anything pending
372                  */
373                 out_be64(&node_iic->iic_is, 0xfffffffffffffffful);
374         }
375
376         if (found)
377                 return 0;
378         else
379                 return -ENODEV;
380 }
381
382 void __init iic_init_IRQ(void)
383 {
384         /* Setup an irq host data structure */
385         iic_host = irq_alloc_host(IRQ_HOST_MAP_LINEAR, IIC_SOURCE_COUNT,
386                                   &iic_host_ops, IIC_IRQ_INVALID);
387         BUG_ON(iic_host == NULL);
388         irq_set_default_host(iic_host);
389
390         /* Discover and initialize iics */
391         if (setup_iic() < 0)
392                 panic("IIC: Failed to initialize !\n");
393
394         /* Set master interrupt handling function */
395         ppc_md.get_irq = iic_get_irq;
396
397         /* Enable on current CPU */
398         iic_setup_cpu();
399 }