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1da177e4 | 1 | /* |
f30c2269 | 2 | * linux/arch/ia64/kernel/irq_ia64.c |
1da177e4 LT |
3 | * |
4 | * Copyright (C) 1998-2001 Hewlett-Packard Co | |
5 | * Stephane Eranian <eranian@hpl.hp.com> | |
6 | * David Mosberger-Tang <davidm@hpl.hp.com> | |
7 | * | |
8 | * 6/10/99: Updated to bring in sync with x86 version to facilitate | |
9 | * support for SMP and different interrupt controllers. | |
10 | * | |
11 | * 09/15/00 Goutham Rao <goutham.rao@intel.com> Implemented pci_irq_to_vector | |
12 | * PCI to vector allocation routine. | |
13 | * 04/14/2004 Ashok Raj <ashok.raj@intel.com> | |
14 | * Added CPU Hotplug handling for IPF. | |
15 | */ | |
16 | ||
1da177e4 LT |
17 | #include <linux/module.h> |
18 | ||
19 | #include <linux/jiffies.h> | |
20 | #include <linux/errno.h> | |
21 | #include <linux/init.h> | |
22 | #include <linux/interrupt.h> | |
23 | #include <linux/ioport.h> | |
24 | #include <linux/kernel_stat.h> | |
25 | #include <linux/slab.h> | |
26 | #include <linux/ptrace.h> | |
27 | #include <linux/random.h> /* for rand_initialize_irq() */ | |
28 | #include <linux/signal.h> | |
29 | #include <linux/smp.h> | |
30 | #include <linux/smp_lock.h> | |
31 | #include <linux/threads.h> | |
32 | #include <linux/bitops.h> | |
b6cf2583 | 33 | #include <linux/irq.h> |
1da177e4 LT |
34 | |
35 | #include <asm/delay.h> | |
36 | #include <asm/intrinsics.h> | |
37 | #include <asm/io.h> | |
38 | #include <asm/hw_irq.h> | |
39 | #include <asm/machvec.h> | |
40 | #include <asm/pgtable.h> | |
41 | #include <asm/system.h> | |
42 | ||
43 | #ifdef CONFIG_PERFMON | |
44 | # include <asm/perfmon.h> | |
45 | #endif | |
46 | ||
47 | #define IRQ_DEBUG 0 | |
48 | ||
10083072 MM |
49 | /* These can be overridden in platform_irq_init */ |
50 | int ia64_first_device_vector = IA64_DEF_FIRST_DEVICE_VECTOR; | |
51 | int ia64_last_device_vector = IA64_DEF_LAST_DEVICE_VECTOR; | |
52 | ||
1da177e4 LT |
53 | /* default base addr of IPI table */ |
54 | void __iomem *ipi_base_addr = ((void __iomem *) | |
55 | (__IA64_UNCACHED_OFFSET | IA64_IPI_DEFAULT_BASE_ADDR)); | |
56 | ||
57 | /* | |
58 | * Legacy IRQ to IA-64 vector translation table. | |
59 | */ | |
60 | __u8 isa_irq_to_vector_map[16] = { | |
61 | /* 8259 IRQ translation, first 16 entries */ | |
62 | 0x2f, 0x20, 0x2e, 0x2d, 0x2c, 0x2b, 0x2a, 0x29, | |
63 | 0x28, 0x27, 0x26, 0x25, 0x24, 0x23, 0x22, 0x21 | |
64 | }; | |
65 | EXPORT_SYMBOL(isa_irq_to_vector_map); | |
66 | ||
10083072 | 67 | static unsigned long ia64_vector_mask[BITS_TO_LONGS(IA64_MAX_DEVICE_VECTORS)]; |
1da177e4 LT |
68 | |
69 | int | |
3b5cc090 | 70 | assign_irq_vector (int irq) |
1da177e4 LT |
71 | { |
72 | int pos, vector; | |
73 | again: | |
74 | pos = find_first_zero_bit(ia64_vector_mask, IA64_NUM_DEVICE_VECTORS); | |
75 | vector = IA64_FIRST_DEVICE_VECTOR + pos; | |
76 | if (vector > IA64_LAST_DEVICE_VECTOR) | |
3b5cc090 | 77 | return -ENOSPC; |
1da177e4 LT |
78 | if (test_and_set_bit(pos, ia64_vector_mask)) |
79 | goto again; | |
80 | return vector; | |
81 | } | |
82 | ||
83 | void | |
84 | free_irq_vector (int vector) | |
85 | { | |
86 | int pos; | |
87 | ||
88 | if (vector < IA64_FIRST_DEVICE_VECTOR || vector > IA64_LAST_DEVICE_VECTOR) | |
89 | return; | |
90 | ||
91 | pos = vector - IA64_FIRST_DEVICE_VECTOR; | |
92 | if (!test_and_clear_bit(pos, ia64_vector_mask)) | |
93 | printk(KERN_WARNING "%s: double free!\n", __FUNCTION__); | |
94 | } | |
95 | ||
10083072 MM |
96 | int |
97 | reserve_irq_vector (int vector) | |
98 | { | |
99 | int pos; | |
100 | ||
101 | if (vector < IA64_FIRST_DEVICE_VECTOR || | |
102 | vector > IA64_LAST_DEVICE_VECTOR) | |
103 | return -EINVAL; | |
104 | ||
105 | pos = vector - IA64_FIRST_DEVICE_VECTOR; | |
106 | return test_and_set_bit(pos, ia64_vector_mask); | |
107 | } | |
108 | ||
b6cf2583 EB |
109 | /* |
110 | * Dynamic irq allocate and deallocation for MSI | |
111 | */ | |
112 | int create_irq(void) | |
113 | { | |
114 | int vector = assign_irq_vector(AUTO_ASSIGN); | |
115 | ||
116 | if (vector >= 0) | |
117 | dynamic_irq_init(vector); | |
118 | ||
119 | return vector; | |
120 | } | |
121 | ||
122 | void destroy_irq(unsigned int irq) | |
123 | { | |
124 | dynamic_irq_cleanup(irq); | |
125 | free_irq_vector(irq); | |
126 | } | |
127 | ||
1da177e4 LT |
128 | #ifdef CONFIG_SMP |
129 | # define IS_RESCHEDULE(vec) (vec == IA64_IPI_RESCHEDULE) | |
130 | #else | |
131 | # define IS_RESCHEDULE(vec) (0) | |
132 | #endif | |
133 | /* | |
134 | * That's where the IVT branches when we get an external | |
135 | * interrupt. This branches to the correct hardware IRQ handler via | |
136 | * function ptr. | |
137 | */ | |
138 | void | |
139 | ia64_handle_irq (ia64_vector vector, struct pt_regs *regs) | |
140 | { | |
7d12e780 | 141 | struct pt_regs *old_regs = set_irq_regs(regs); |
1da177e4 LT |
142 | unsigned long saved_tpr; |
143 | ||
144 | #if IRQ_DEBUG | |
145 | { | |
146 | unsigned long bsp, sp; | |
147 | ||
148 | /* | |
149 | * Note: if the interrupt happened while executing in | |
150 | * the context switch routine (ia64_switch_to), we may | |
151 | * get a spurious stack overflow here. This is | |
152 | * because the register and the memory stack are not | |
153 | * switched atomically. | |
154 | */ | |
155 | bsp = ia64_getreg(_IA64_REG_AR_BSP); | |
156 | sp = ia64_getreg(_IA64_REG_SP); | |
157 | ||
158 | if ((sp - bsp) < 1024) { | |
159 | static unsigned char count; | |
160 | static long last_time; | |
161 | ||
162 | if (jiffies - last_time > 5*HZ) | |
163 | count = 0; | |
164 | if (++count < 5) { | |
165 | last_time = jiffies; | |
166 | printk("ia64_handle_irq: DANGER: less than " | |
167 | "1KB of free stack space!!\n" | |
168 | "(bsp=0x%lx, sp=%lx)\n", bsp, sp); | |
169 | } | |
170 | } | |
171 | } | |
172 | #endif /* IRQ_DEBUG */ | |
173 | ||
174 | /* | |
175 | * Always set TPR to limit maximum interrupt nesting depth to | |
176 | * 16 (without this, it would be ~240, which could easily lead | |
177 | * to kernel stack overflows). | |
178 | */ | |
179 | irq_enter(); | |
180 | saved_tpr = ia64_getreg(_IA64_REG_CR_TPR); | |
181 | ia64_srlz_d(); | |
182 | while (vector != IA64_SPURIOUS_INT_VECTOR) { | |
183 | if (!IS_RESCHEDULE(vector)) { | |
184 | ia64_setreg(_IA64_REG_CR_TPR, vector); | |
185 | ia64_srlz_d(); | |
186 | ||
7d12e780 | 187 | __do_IRQ(local_vector_to_irq(vector)); |
1da177e4 LT |
188 | |
189 | /* | |
190 | * Disable interrupts and send EOI: | |
191 | */ | |
192 | local_irq_disable(); | |
193 | ia64_setreg(_IA64_REG_CR_TPR, saved_tpr); | |
194 | } | |
195 | ia64_eoi(); | |
196 | vector = ia64_get_ivr(); | |
197 | } | |
198 | /* | |
199 | * This must be done *after* the ia64_eoi(). For example, the keyboard softirq | |
200 | * handler needs to be able to wait for further keyboard interrupts, which can't | |
201 | * come through until ia64_eoi() has been done. | |
202 | */ | |
203 | irq_exit(); | |
7d12e780 | 204 | set_irq_regs(old_regs); |
1da177e4 LT |
205 | } |
206 | ||
207 | #ifdef CONFIG_HOTPLUG_CPU | |
208 | /* | |
209 | * This function emulates a interrupt processing when a cpu is about to be | |
210 | * brought down. | |
211 | */ | |
212 | void ia64_process_pending_intr(void) | |
213 | { | |
214 | ia64_vector vector; | |
215 | unsigned long saved_tpr; | |
216 | extern unsigned int vectors_in_migration[NR_IRQS]; | |
217 | ||
218 | vector = ia64_get_ivr(); | |
219 | ||
220 | irq_enter(); | |
221 | saved_tpr = ia64_getreg(_IA64_REG_CR_TPR); | |
222 | ia64_srlz_d(); | |
223 | ||
224 | /* | |
225 | * Perform normal interrupt style processing | |
226 | */ | |
227 | while (vector != IA64_SPURIOUS_INT_VECTOR) { | |
228 | if (!IS_RESCHEDULE(vector)) { | |
229 | ia64_setreg(_IA64_REG_CR_TPR, vector); | |
230 | ia64_srlz_d(); | |
231 | ||
232 | /* | |
233 | * Now try calling normal ia64_handle_irq as it would have got called | |
234 | * from a real intr handler. Try passing null for pt_regs, hopefully | |
235 | * it will work. I hope it works!. | |
236 | * Probably could shared code. | |
237 | */ | |
238 | vectors_in_migration[local_vector_to_irq(vector)]=0; | |
239 | __do_IRQ(local_vector_to_irq(vector), NULL); | |
240 | ||
241 | /* | |
242 | * Disable interrupts and send EOI | |
243 | */ | |
244 | local_irq_disable(); | |
245 | ia64_setreg(_IA64_REG_CR_TPR, saved_tpr); | |
246 | } | |
247 | ia64_eoi(); | |
248 | vector = ia64_get_ivr(); | |
249 | } | |
250 | irq_exit(); | |
251 | } | |
252 | #endif | |
253 | ||
254 | ||
255 | #ifdef CONFIG_SMP | |
256 | extern irqreturn_t handle_IPI (int irq, void *dev_id, struct pt_regs *regs); | |
257 | ||
258 | static struct irqaction ipi_irqaction = { | |
259 | .handler = handle_IPI, | |
121a4226 | 260 | .flags = IRQF_DISABLED, |
1da177e4 LT |
261 | .name = "IPI" |
262 | }; | |
263 | #endif | |
264 | ||
265 | void | |
266 | register_percpu_irq (ia64_vector vec, struct irqaction *action) | |
267 | { | |
268 | irq_desc_t *desc; | |
269 | unsigned int irq; | |
270 | ||
271 | for (irq = 0; irq < NR_IRQS; ++irq) | |
272 | if (irq_to_vector(irq) == vec) { | |
a8553acd | 273 | desc = irq_desc + irq; |
1da177e4 | 274 | desc->status |= IRQ_PER_CPU; |
d1bef4ed | 275 | desc->chip = &irq_type_ia64_lsapic; |
1da177e4 LT |
276 | if (action) |
277 | setup_irq(irq, action); | |
278 | } | |
279 | } | |
280 | ||
281 | void __init | |
282 | init_IRQ (void) | |
283 | { | |
284 | register_percpu_irq(IA64_SPURIOUS_INT_VECTOR, NULL); | |
285 | #ifdef CONFIG_SMP | |
286 | register_percpu_irq(IA64_IPI_VECTOR, &ipi_irqaction); | |
287 | #endif | |
288 | #ifdef CONFIG_PERFMON | |
289 | pfm_init_percpu(); | |
290 | #endif | |
291 | platform_irq_init(); | |
292 | } | |
293 | ||
294 | void | |
295 | ia64_send_ipi (int cpu, int vector, int delivery_mode, int redirect) | |
296 | { | |
297 | void __iomem *ipi_addr; | |
298 | unsigned long ipi_data; | |
299 | unsigned long phys_cpu_id; | |
300 | ||
301 | #ifdef CONFIG_SMP | |
302 | phys_cpu_id = cpu_physical_id(cpu); | |
303 | #else | |
304 | phys_cpu_id = (ia64_getreg(_IA64_REG_CR_LID) >> 16) & 0xffff; | |
305 | #endif | |
306 | ||
307 | /* | |
308 | * cpu number is in 8bit ID and 8bit EID | |
309 | */ | |
310 | ||
311 | ipi_data = (delivery_mode << 8) | (vector & 0xff); | |
312 | ipi_addr = ipi_base_addr + ((phys_cpu_id << 4) | ((redirect & 1) << 3)); | |
313 | ||
314 | writeq(ipi_data, ipi_addr); | |
315 | } |