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-rw-r--r--arch/mips/kernel/irq-gic.c295
1 files changed, 295 insertions, 0 deletions
diff --git a/arch/mips/kernel/irq-gic.c b/arch/mips/kernel/irq-gic.c
new file mode 100644
index 000000000000..f0a4bb19e096
--- /dev/null
+++ b/arch/mips/kernel/irq-gic.c
@@ -0,0 +1,295 @@
1#undef DEBUG
2
3#include <linux/bitmap.h>
4#include <linux/init.h>
5
6#include <asm/io.h>
7#include <asm/gic.h>
8#include <asm/gcmpregs.h>
9#include <asm/mips-boards/maltaint.h>
10#include <asm/irq.h>
11#include <linux/hardirq.h>
12#include <asm-generic/bitops/find.h>
13
14
15static unsigned long _gic_base;
16static unsigned int _irqbase, _mapsize, numvpes, numintrs;
17static struct gic_intr_map *_intrmap;
18
19static struct gic_pcpu_mask pcpu_masks[NR_CPUS];
20static struct gic_pending_regs pending_regs[NR_CPUS];
21static struct gic_intrmask_regs intrmask_regs[NR_CPUS];
22
23#define gic_wedgeb2bok 0 /*
24 * Can GIC handle b2b writes to wedge register?
25 */
26#if gic_wedgeb2bok == 0
27static DEFINE_SPINLOCK(gic_wedgeb2b_lock);
28#endif
29
30void gic_send_ipi(unsigned int intr)
31{
32#if gic_wedgeb2bok == 0
33 unsigned long flags;
34#endif
35 pr_debug("CPU%d: %s status %08x\n", smp_processor_id(), __func__,
36 read_c0_status());
37 if (!gic_wedgeb2bok)
38 spin_lock_irqsave(&gic_wedgeb2b_lock, flags);
39 GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), 0x80000000 | intr);
40 if (!gic_wedgeb2bok) {
41 (void) GIC_REG(SHARED, GIC_SH_CONFIG);
42 spin_unlock_irqrestore(&gic_wedgeb2b_lock, flags);
43 }
44}
45
46/* This is Malta specific and needs to be exported */
47static void vpe_local_setup(unsigned int numvpes)
48{
49 int i;
50 unsigned long timer_interrupt = 5, perf_interrupt = 5;
51 unsigned int vpe_ctl;
52
53 /*
54 * Setup the default performance counter timer interrupts
55 * for all VPEs
56 */
57 for (i = 0; i < numvpes; i++) {
58 GICWRITE(GIC_REG(VPE_LOCAL, GIC_VPE_OTHER_ADDR), i);
59
60 /* Are Interrupts locally routable? */
61 GICREAD(GIC_REG(VPE_OTHER, GIC_VPE_CTL), vpe_ctl);
62 if (vpe_ctl & GIC_VPE_CTL_TIMER_RTBL_MSK)
63 GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_TIMER_MAP),
64 GIC_MAP_TO_PIN_MSK | timer_interrupt);
65
66 if (vpe_ctl & GIC_VPE_CTL_PERFCNT_RTBL_MSK)
67 GICWRITE(GIC_REG(VPE_OTHER, GIC_VPE_PERFCTR_MAP),
68 GIC_MAP_TO_PIN_MSK | perf_interrupt);
69 }
70}
71
72unsigned int gic_get_int(void)
73{
74 unsigned int i;
75 unsigned long *pending, *intrmask, *pcpu_mask;
76 unsigned long *pending_abs, *intrmask_abs;
77
78 /* Get per-cpu bitmaps */
79 pending = pending_regs[smp_processor_id()].pending;
80 intrmask = intrmask_regs[smp_processor_id()].intrmask;
81 pcpu_mask = pcpu_masks[smp_processor_id()].pcpu_mask;
82
83 pending_abs = (unsigned long *) GIC_REG_ABS_ADDR(SHARED,
84 GIC_SH_PEND_31_0_OFS);
85 intrmask_abs = (unsigned long *) GIC_REG_ABS_ADDR(SHARED,
86 GIC_SH_MASK_31_0_OFS);
87
88 for (i = 0; i < BITS_TO_LONGS(GIC_NUM_INTRS); i++) {
89 GICREAD(*pending_abs, pending[i]);
90 GICREAD(*intrmask_abs, intrmask[i]);
91 pending_abs++;
92 intrmask_abs++;
93 }
94
95 bitmap_and(pending, pending, intrmask, GIC_NUM_INTRS);
96 bitmap_and(pending, pending, pcpu_mask, GIC_NUM_INTRS);
97
98 i = find_first_bit(pending, GIC_NUM_INTRS);
99
100 pr_debug("CPU%d: %s pend=%d\n", smp_processor_id(), __func__, i);
101
102 return i;
103}
104
105static unsigned int gic_irq_startup(unsigned int irq)
106{
107 pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
108 irq -= _irqbase;
109 /* FIXME: this is wrong for !GICISWORDLITTLEENDIAN */
110 GICWRITE(GIC_REG_ADDR(SHARED, (GIC_SH_SMASK_31_0_OFS + (irq / 32))),
111 1 << (irq % 32));
112 return 0;
113}
114
115static void gic_irq_ack(unsigned int irq)
116{
117#if gic_wedgeb2bok == 0
118 unsigned long flags;
119#endif
120 pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
121 irq -= _irqbase;
122 GICWRITE(GIC_REG_ADDR(SHARED, (GIC_SH_RMASK_31_0_OFS + (irq / 32))),
123 1 << (irq % 32));
124
125 if (_intrmap[irq].trigtype == GIC_TRIG_EDGE) {
126 if (!gic_wedgeb2bok)
127 spin_lock_irqsave(&gic_wedgeb2b_lock, flags);
128 GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), irq);
129 if (!gic_wedgeb2bok) {
130 (void) GIC_REG(SHARED, GIC_SH_CONFIG);
131 spin_unlock_irqrestore(&gic_wedgeb2b_lock, flags);
132 }
133 }
134}
135
136static void gic_mask_irq(unsigned int irq)
137{
138 pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
139 irq -= _irqbase;
140 /* FIXME: this is wrong for !GICISWORDLITTLEENDIAN */
141 GICWRITE(GIC_REG_ADDR(SHARED, (GIC_SH_RMASK_31_0_OFS + (irq / 32))),
142 1 << (irq % 32));
143}
144
145static void gic_unmask_irq(unsigned int irq)
146{
147 pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
148 irq -= _irqbase;
149 /* FIXME: this is wrong for !GICISWORDLITTLEENDIAN */
150 GICWRITE(GIC_REG_ADDR(SHARED, (GIC_SH_SMASK_31_0_OFS + (irq / 32))),
151 1 << (irq % 32));
152}
153
154#ifdef CONFIG_SMP
155
156static DEFINE_SPINLOCK(gic_lock);
157
158static void gic_set_affinity(unsigned int irq, cpumask_t cpumask)
159{
160 cpumask_t tmp = CPU_MASK_NONE;
161 unsigned long flags;
162 int i;
163
164 pr_debug(KERN_DEBUG "%s called\n", __func__);
165 irq -= _irqbase;
166
167 cpus_and(tmp, cpumask, cpu_online_map);
168 if (cpus_empty(tmp))
169 return;
170
171 /* Assumption : cpumask refers to a single CPU */
172 spin_lock_irqsave(&gic_lock, flags);
173 for (;;) {
174 /* Re-route this IRQ */
175 GIC_SH_MAP_TO_VPE_SMASK(irq, first_cpu(tmp));
176
177 /*
178 * FIXME: assumption that _intrmap is ordered and has no holes
179 */
180
181 /* Update the intr_map */
182 _intrmap[irq].cpunum = first_cpu(tmp);
183
184 /* Update the pcpu_masks */
185 for (i = 0; i < NR_CPUS; i++)
186 clear_bit(irq, pcpu_masks[i].pcpu_mask);
187 set_bit(irq, pcpu_masks[first_cpu(tmp)].pcpu_mask);
188
189 }
190 irq_desc[irq].affinity = cpumask;
191 spin_unlock_irqrestore(&gic_lock, flags);
192
193}
194#endif
195
196static struct irq_chip gic_irq_controller = {
197 .name = "MIPS GIC",
198 .startup = gic_irq_startup,
199 .ack = gic_irq_ack,
200 .mask = gic_mask_irq,
201 .mask_ack = gic_mask_irq,
202 .unmask = gic_unmask_irq,
203 .eoi = gic_unmask_irq,
204#ifdef CONFIG_SMP
205 .set_affinity = gic_set_affinity,
206#endif
207};
208
209static void __init setup_intr(unsigned int intr, unsigned int cpu,
210 unsigned int pin, unsigned int polarity, unsigned int trigtype)
211{
212 /* Setup Intr to Pin mapping */
213 if (pin & GIC_MAP_TO_NMI_MSK) {
214 GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(intr)), pin);
215 /* FIXME: hack to route NMI to all cpu's */
216 for (cpu = 0; cpu < NR_CPUS; cpu += 32) {
217 GICWRITE(GIC_REG_ADDR(SHARED,
218 GIC_SH_MAP_TO_VPE_REG_OFF(intr, cpu)),
219 0xffffffff);
220 }
221 } else {
222 GICWRITE(GIC_REG_ADDR(SHARED, GIC_SH_MAP_TO_PIN(intr)),
223 GIC_MAP_TO_PIN_MSK | pin);
224 /* Setup Intr to CPU mapping */
225 GIC_SH_MAP_TO_VPE_SMASK(intr, cpu);
226 }
227
228 /* Setup Intr Polarity */
229 GIC_SET_POLARITY(intr, polarity);
230
231 /* Setup Intr Trigger Type */
232 GIC_SET_TRIGGER(intr, trigtype);
233
234 /* Init Intr Masks */
235 GIC_SET_INTR_MASK(intr, 0);
236}
237
238static void __init gic_basic_init(void)
239{
240 unsigned int i, cpu;
241
242 /* Setup defaults */
243 for (i = 0; i < GIC_NUM_INTRS; i++) {
244 GIC_SET_POLARITY(i, GIC_POL_POS);
245 GIC_SET_TRIGGER(i, GIC_TRIG_LEVEL);
246 GIC_SET_INTR_MASK(i, 0);
247 }
248
249 /* Setup specifics */
250 for (i = 0; i < _mapsize; i++) {
251 cpu = _intrmap[i].cpunum;
252 if (cpu == X)
253 continue;
254
255 setup_intr(_intrmap[i].intrnum,
256 _intrmap[i].cpunum,
257 _intrmap[i].pin,
258 _intrmap[i].polarity,
259 _intrmap[i].trigtype);
260 /* Initialise per-cpu Interrupt software masks */
261 if (_intrmap[i].ipiflag)
262 set_bit(_intrmap[i].intrnum, pcpu_masks[cpu].pcpu_mask);
263 }
264
265 vpe_local_setup(numvpes);
266
267 for (i = _irqbase; i < (_irqbase + numintrs); i++)
268 set_irq_chip(i, &gic_irq_controller);
269}
270
271void __init gic_init(unsigned long gic_base_addr,
272 unsigned long gic_addrspace_size,
273 struct gic_intr_map *intr_map, unsigned int intr_map_size,
274 unsigned int irqbase)
275{
276 unsigned int gicconfig;
277
278 _gic_base = (unsigned long) ioremap_nocache(gic_base_addr,
279 gic_addrspace_size);
280 _irqbase = irqbase;
281 _intrmap = intr_map;
282 _mapsize = intr_map_size;
283
284 GICREAD(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
285 numintrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
286 GIC_SH_CONFIG_NUMINTRS_SHF;
287 numintrs = ((numintrs + 1) * 8);
288
289 numvpes = (gicconfig & GIC_SH_CONFIG_NUMVPES_MSK) >>
290 GIC_SH_CONFIG_NUMVPES_SHF;
291
292 pr_debug("%s called\n", __func__);
293
294 gic_basic_init();
295}
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