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1 | /* | |
2 | * Copyright (C) 2000, 2001, 2002, 2003 Broadcom Corporation | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or | |
5 | * modify it under the terms of the GNU General Public License | |
6 | * as published by the Free Software Foundation; either version 2 | |
7 | * of the License, or (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | */ | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/init.h> | |
20 | #include <linux/linkage.h> | |
21 | #include <linux/interrupt.h> | |
22 | #include <linux/spinlock.h> | |
23 | #include <linux/smp.h> | |
24 | #include <linux/mm.h> | |
25 | #include <linux/kernel_stat.h> | |
26 | ||
27 | #include <asm/errno.h> | |
28 | #include <asm/signal.h> | |
29 | #include <asm/system.h> | |
30 | #include <asm/time.h> | |
31 | #include <asm/io.h> | |
32 | ||
33 | #include <asm/sibyte/sb1250_regs.h> | |
34 | #include <asm/sibyte/sb1250_int.h> | |
35 | #include <asm/sibyte/sb1250_uart.h> | |
36 | #include <asm/sibyte/sb1250_scd.h> | |
37 | #include <asm/sibyte/sb1250.h> | |
38 | ||
39 | /* | |
40 | * These are the routines that handle all the low level interrupt stuff. | |
41 | * Actions handled here are: initialization of the interrupt map, requesting of | |
42 | * interrupt lines by handlers, dispatching if interrupts to handlers, probing | |
43 | * for interrupt lines | |
44 | */ | |
45 | ||
46 | ||
47 | static void end_sb1250_irq(unsigned int irq); | |
48 | static void enable_sb1250_irq(unsigned int irq); | |
49 | static void disable_sb1250_irq(unsigned int irq); | |
50 | static void ack_sb1250_irq(unsigned int irq); | |
51 | #ifdef CONFIG_SMP | |
52 | static int sb1250_set_affinity(unsigned int irq, const struct cpumask *mask); | |
53 | #endif | |
54 | ||
55 | #ifdef CONFIG_SIBYTE_HAS_LDT | |
56 | extern unsigned long ldt_eoi_space; | |
57 | #endif | |
58 | ||
59 | static struct irq_chip sb1250_irq_type = { | |
60 | .name = "SB1250-IMR", | |
61 | .ack = ack_sb1250_irq, | |
62 | .mask = disable_sb1250_irq, | |
63 | .mask_ack = ack_sb1250_irq, | |
64 | .unmask = enable_sb1250_irq, | |
65 | .end = end_sb1250_irq, | |
66 | #ifdef CONFIG_SMP | |
67 | .set_affinity = sb1250_set_affinity | |
68 | #endif | |
69 | }; | |
70 | ||
71 | /* Store the CPU id (not the logical number) */ | |
72 | int sb1250_irq_owner[SB1250_NR_IRQS]; | |
73 | ||
74 | static DEFINE_RAW_SPINLOCK(sb1250_imr_lock); | |
75 | ||
76 | void sb1250_mask_irq(int cpu, int irq) | |
77 | { | |
78 | unsigned long flags; | |
79 | u64 cur_ints; | |
80 | ||
81 | raw_spin_lock_irqsave(&sb1250_imr_lock, flags); | |
82 | cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) + | |
83 | R_IMR_INTERRUPT_MASK)); | |
84 | cur_ints |= (((u64) 1) << irq); | |
85 | ____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) + | |
86 | R_IMR_INTERRUPT_MASK)); | |
87 | raw_spin_unlock_irqrestore(&sb1250_imr_lock, flags); | |
88 | } | |
89 | ||
90 | void sb1250_unmask_irq(int cpu, int irq) | |
91 | { | |
92 | unsigned long flags; | |
93 | u64 cur_ints; | |
94 | ||
95 | raw_spin_lock_irqsave(&sb1250_imr_lock, flags); | |
96 | cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) + | |
97 | R_IMR_INTERRUPT_MASK)); | |
98 | cur_ints &= ~(((u64) 1) << irq); | |
99 | ____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) + | |
100 | R_IMR_INTERRUPT_MASK)); | |
101 | raw_spin_unlock_irqrestore(&sb1250_imr_lock, flags); | |
102 | } | |
103 | ||
104 | #ifdef CONFIG_SMP | |
105 | static int sb1250_set_affinity(unsigned int irq, const struct cpumask *mask) | |
106 | { | |
107 | int i = 0, old_cpu, cpu, int_on; | |
108 | u64 cur_ints; | |
109 | unsigned long flags; | |
110 | ||
111 | i = cpumask_first(mask); | |
112 | ||
113 | /* Convert logical CPU to physical CPU */ | |
114 | cpu = cpu_logical_map(i); | |
115 | ||
116 | /* Protect against other affinity changers and IMR manipulation */ | |
117 | raw_spin_lock_irqsave(&sb1250_imr_lock, flags); | |
118 | ||
119 | /* Swizzle each CPU's IMR (but leave the IP selection alone) */ | |
120 | old_cpu = sb1250_irq_owner[irq]; | |
121 | cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(old_cpu) + | |
122 | R_IMR_INTERRUPT_MASK)); | |
123 | int_on = !(cur_ints & (((u64) 1) << irq)); | |
124 | if (int_on) { | |
125 | /* If it was on, mask it */ | |
126 | cur_ints |= (((u64) 1) << irq); | |
127 | ____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(old_cpu) + | |
128 | R_IMR_INTERRUPT_MASK)); | |
129 | } | |
130 | sb1250_irq_owner[irq] = cpu; | |
131 | if (int_on) { | |
132 | /* unmask for the new CPU */ | |
133 | cur_ints = ____raw_readq(IOADDR(A_IMR_MAPPER(cpu) + | |
134 | R_IMR_INTERRUPT_MASK)); | |
135 | cur_ints &= ~(((u64) 1) << irq); | |
136 | ____raw_writeq(cur_ints, IOADDR(A_IMR_MAPPER(cpu) + | |
137 | R_IMR_INTERRUPT_MASK)); | |
138 | } | |
139 | raw_spin_unlock_irqrestore(&sb1250_imr_lock, flags); | |
140 | ||
141 | return 0; | |
142 | } | |
143 | #endif | |
144 | ||
145 | /*****************************************************************************/ | |
146 | ||
147 | static void disable_sb1250_irq(unsigned int irq) | |
148 | { | |
149 | sb1250_mask_irq(sb1250_irq_owner[irq], irq); | |
150 | } | |
151 | ||
152 | static void enable_sb1250_irq(unsigned int irq) | |
153 | { | |
154 | sb1250_unmask_irq(sb1250_irq_owner[irq], irq); | |
155 | } | |
156 | ||
157 | ||
158 | static void ack_sb1250_irq(unsigned int irq) | |
159 | { | |
160 | #ifdef CONFIG_SIBYTE_HAS_LDT | |
161 | u64 pending; | |
162 | ||
163 | /* | |
164 | * If the interrupt was an HT interrupt, now is the time to | |
165 | * clear it. NOTE: we assume the HT bridge was set up to | |
166 | * deliver the interrupts to all CPUs (which makes affinity | |
167 | * changing easier for us) | |
168 | */ | |
169 | pending = __raw_readq(IOADDR(A_IMR_REGISTER(sb1250_irq_owner[irq], | |
170 | R_IMR_LDT_INTERRUPT))); | |
171 | pending &= ((u64)1 << (irq)); | |
172 | if (pending) { | |
173 | int i; | |
174 | for (i=0; i<NR_CPUS; i++) { | |
175 | int cpu; | |
176 | #ifdef CONFIG_SMP | |
177 | cpu = cpu_logical_map(i); | |
178 | #else | |
179 | cpu = i; | |
180 | #endif | |
181 | /* | |
182 | * Clear for all CPUs so an affinity switch | |
183 | * doesn't find an old status | |
184 | */ | |
185 | __raw_writeq(pending, | |
186 | IOADDR(A_IMR_REGISTER(cpu, | |
187 | R_IMR_LDT_INTERRUPT_CLR))); | |
188 | } | |
189 | ||
190 | /* | |
191 | * Generate EOI. For Pass 1 parts, EOI is a nop. For | |
192 | * Pass 2, the LDT world may be edge-triggered, but | |
193 | * this EOI shouldn't hurt. If they are | |
194 | * level-sensitive, the EOI is required. | |
195 | */ | |
196 | *(uint32_t *)(ldt_eoi_space+(irq<<16)+(7<<2)) = 0; | |
197 | } | |
198 | #endif | |
199 | sb1250_mask_irq(sb1250_irq_owner[irq], irq); | |
200 | } | |
201 | ||
202 | ||
203 | static void end_sb1250_irq(unsigned int irq) | |
204 | { | |
205 | if (!(irq_desc[irq].status & (IRQ_DISABLED | IRQ_INPROGRESS))) { | |
206 | sb1250_unmask_irq(sb1250_irq_owner[irq], irq); | |
207 | } | |
208 | } | |
209 | ||
210 | ||
211 | void __init init_sb1250_irqs(void) | |
212 | { | |
213 | int i; | |
214 | ||
215 | for (i = 0; i < SB1250_NR_IRQS; i++) { | |
216 | set_irq_chip_and_handler(i, &sb1250_irq_type, handle_level_irq); | |
217 | sb1250_irq_owner[i] = 0; | |
218 | } | |
219 | } | |
220 | ||
221 | ||
222 | /* | |
223 | * arch_init_irq is called early in the boot sequence from init/main.c via | |
224 | * init_IRQ. It is responsible for setting up the interrupt mapper and | |
225 | * installing the handler that will be responsible for dispatching interrupts | |
226 | * to the "right" place. | |
227 | */ | |
228 | /* | |
229 | * For now, map all interrupts to IP[2]. We could save | |
230 | * some cycles by parceling out system interrupts to different | |
231 | * IP lines, but keep it simple for bringup. We'll also direct | |
232 | * all interrupts to a single CPU; we should probably route | |
233 | * PCI and LDT to one cpu and everything else to the other | |
234 | * to balance the load a bit. | |
235 | * | |
236 | * On the second cpu, everything is set to IP5, which is | |
237 | * ignored, EXCEPT the mailbox interrupt. That one is | |
238 | * set to IP[2] so it is handled. This is needed so we | |
239 | * can do cross-cpu function calls, as requred by SMP | |
240 | */ | |
241 | ||
242 | #define IMR_IP2_VAL K_INT_MAP_I0 | |
243 | #define IMR_IP3_VAL K_INT_MAP_I1 | |
244 | #define IMR_IP4_VAL K_INT_MAP_I2 | |
245 | #define IMR_IP5_VAL K_INT_MAP_I3 | |
246 | #define IMR_IP6_VAL K_INT_MAP_I4 | |
247 | ||
248 | void __init arch_init_irq(void) | |
249 | { | |
250 | ||
251 | unsigned int i; | |
252 | u64 tmp; | |
253 | unsigned int imask = STATUSF_IP4 | STATUSF_IP3 | STATUSF_IP2 | | |
254 | STATUSF_IP1 | STATUSF_IP0; | |
255 | ||
256 | /* Default everything to IP2 */ | |
257 | for (i = 0; i < SB1250_NR_IRQS; i++) { /* was I0 */ | |
258 | __raw_writeq(IMR_IP2_VAL, | |
259 | IOADDR(A_IMR_REGISTER(0, | |
260 | R_IMR_INTERRUPT_MAP_BASE) + | |
261 | (i << 3))); | |
262 | __raw_writeq(IMR_IP2_VAL, | |
263 | IOADDR(A_IMR_REGISTER(1, | |
264 | R_IMR_INTERRUPT_MAP_BASE) + | |
265 | (i << 3))); | |
266 | } | |
267 | ||
268 | init_sb1250_irqs(); | |
269 | ||
270 | /* | |
271 | * Map the high 16 bits of the mailbox registers to IP[3], for | |
272 | * inter-cpu messages | |
273 | */ | |
274 | /* Was I1 */ | |
275 | __raw_writeq(IMR_IP3_VAL, | |
276 | IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MAP_BASE) + | |
277 | (K_INT_MBOX_0 << 3))); | |
278 | __raw_writeq(IMR_IP3_VAL, | |
279 | IOADDR(A_IMR_REGISTER(1, R_IMR_INTERRUPT_MAP_BASE) + | |
280 | (K_INT_MBOX_0 << 3))); | |
281 | ||
282 | /* Clear the mailboxes. The firmware may leave them dirty */ | |
283 | __raw_writeq(0xffffffffffffffffULL, | |
284 | IOADDR(A_IMR_REGISTER(0, R_IMR_MAILBOX_CLR_CPU))); | |
285 | __raw_writeq(0xffffffffffffffffULL, | |
286 | IOADDR(A_IMR_REGISTER(1, R_IMR_MAILBOX_CLR_CPU))); | |
287 | ||
288 | /* Mask everything except the mailbox registers for both cpus */ | |
289 | tmp = ~((u64) 0) ^ (((u64) 1) << K_INT_MBOX_0); | |
290 | __raw_writeq(tmp, IOADDR(A_IMR_REGISTER(0, R_IMR_INTERRUPT_MASK))); | |
291 | __raw_writeq(tmp, IOADDR(A_IMR_REGISTER(1, R_IMR_INTERRUPT_MASK))); | |
292 | ||
293 | /* | |
294 | * Note that the timer interrupts are also mapped, but this is | |
295 | * done in sb1250_time_init(). Also, the profiling driver | |
296 | * does its own management of IP7. | |
297 | */ | |
298 | ||
299 | /* Enable necessary IPs, disable the rest */ | |
300 | change_c0_status(ST0_IM, imask); | |
301 | } | |
302 | ||
303 | extern void sb1250_mailbox_interrupt(void); | |
304 | ||
305 | static inline void dispatch_ip2(void) | |
306 | { | |
307 | unsigned int cpu = smp_processor_id(); | |
308 | unsigned long long mask; | |
309 | ||
310 | /* | |
311 | * Default...we've hit an IP[2] interrupt, which means we've got to | |
312 | * check the 1250 interrupt registers to figure out what to do. Need | |
313 | * to detect which CPU we're on, now that smp_affinity is supported. | |
314 | */ | |
315 | mask = __raw_readq(IOADDR(A_IMR_REGISTER(cpu, | |
316 | R_IMR_INTERRUPT_STATUS_BASE))); | |
317 | if (mask) | |
318 | do_IRQ(fls64(mask) - 1); | |
319 | } | |
320 | ||
321 | asmlinkage void plat_irq_dispatch(void) | |
322 | { | |
323 | unsigned int cpu = smp_processor_id(); | |
324 | unsigned int pending; | |
325 | ||
326 | /* | |
327 | * What a pain. We have to be really careful saving the upper 32 bits | |
328 | * of any * register across function calls if we don't want them | |
329 | * trashed--since were running in -o32, the calling routing never saves | |
330 | * the full 64 bits of a register across a function call. Being the | |
331 | * interrupt handler, we're guaranteed that interrupts are disabled | |
332 | * during this code so we don't have to worry about random interrupts | |
333 | * blasting the high 32 bits. | |
334 | */ | |
335 | ||
336 | pending = read_c0_cause() & read_c0_status() & ST0_IM; | |
337 | ||
338 | if (pending & CAUSEF_IP7) /* CPU performance counter interrupt */ | |
339 | do_IRQ(MIPS_CPU_IRQ_BASE + 7); | |
340 | else if (pending & CAUSEF_IP4) | |
341 | do_IRQ(K_INT_TIMER_0 + cpu); /* sb1250_timer_interrupt() */ | |
342 | ||
343 | #ifdef CONFIG_SMP | |
344 | else if (pending & CAUSEF_IP3) | |
345 | sb1250_mailbox_interrupt(); | |
346 | #endif | |
347 | ||
348 | else if (pending & CAUSEF_IP2) | |
349 | dispatch_ip2(); | |
350 | else | |
351 | spurious_interrupt(); | |
352 | } |