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1da177e4 LT |
1 | /* |
2 | * linux/arch/h8300/platform/h8s/ints.c | |
3 | * | |
4 | * Yoshinori Sato <ysato@users.sourceforge.jp> | |
5 | * | |
6 | * Based on linux/arch/$(ARCH)/platform/$(PLATFORM)/ints.c | |
7 | * | |
8 | * This file is subject to the terms and conditions of the GNU General Public | |
9 | * License. See the file COPYING in the main directory of this archive | |
10 | * for more details. | |
11 | * | |
12 | * Copyright 1996 Roman Zippel | |
13 | * Copyright 1999 D. Jeff Dionne <jeff@rt-control.com> | |
14 | */ | |
15 | ||
16 | #include <linux/module.h> | |
17 | #include <linux/types.h> | |
18 | #include <linux/kernel.h> | |
19 | #include <linux/sched.h> | |
20 | #include <linux/kernel_stat.h> | |
21 | #include <linux/seq_file.h> | |
22 | #include <linux/init.h> | |
6168a702 | 23 | #include <linux/interrupt.h> |
1da177e4 LT |
24 | #include <linux/bootmem.h> |
25 | #include <linux/random.h> | |
26 | #include <linux/hardirq.h> | |
27 | ||
28 | #include <asm/system.h> | |
29 | #include <asm/irq.h> | |
30 | #include <asm/traps.h> | |
31 | #include <asm/io.h> | |
32 | #include <asm/setup.h> | |
33 | #include <asm/gpio.h> | |
34 | #include <asm/regs267x.h> | |
35 | #include <asm/errno.h> | |
36 | ||
37 | /* | |
38 | * This structure has only 4 elements for speed reasons | |
39 | */ | |
40 | typedef struct irq_handler { | |
41 | irqreturn_t (*handler)(int, void *, struct pt_regs *); | |
42 | int flags; | |
43 | int count; | |
44 | void *dev_id; | |
45 | const char *devname; | |
46 | } irq_handler_t; | |
47 | ||
48 | static irq_handler_t *irq_list[NR_IRQS]; | |
49 | ||
50 | /* IRQ pin assignment */ | |
51 | struct irq_pins { | |
52 | unsigned char port_no; | |
53 | unsigned char bit_no; | |
54 | }; | |
55 | /* ISTR = 0 */ | |
3c6bee1d | 56 | static const struct irq_pins irq_assign_table0[16]={ |
1da177e4 LT |
57 | {H8300_GPIO_P5,H8300_GPIO_B0},{H8300_GPIO_P5,H8300_GPIO_B1}, |
58 | {H8300_GPIO_P5,H8300_GPIO_B2},{H8300_GPIO_P5,H8300_GPIO_B3}, | |
59 | {H8300_GPIO_P5,H8300_GPIO_B4},{H8300_GPIO_P5,H8300_GPIO_B5}, | |
60 | {H8300_GPIO_P5,H8300_GPIO_B6},{H8300_GPIO_P5,H8300_GPIO_B7}, | |
61 | {H8300_GPIO_P6,H8300_GPIO_B0},{H8300_GPIO_P6,H8300_GPIO_B1}, | |
62 | {H8300_GPIO_P6,H8300_GPIO_B2},{H8300_GPIO_P6,H8300_GPIO_B3}, | |
63 | {H8300_GPIO_P6,H8300_GPIO_B4},{H8300_GPIO_P6,H8300_GPIO_B5}, | |
64 | {H8300_GPIO_PF,H8300_GPIO_B1},{H8300_GPIO_PF,H8300_GPIO_B2}, | |
65 | }; | |
66 | /* ISTR = 1 */ | |
3c6bee1d | 67 | static const struct irq_pins irq_assign_table1[16]={ |
1da177e4 LT |
68 | {H8300_GPIO_P8,H8300_GPIO_B0},{H8300_GPIO_P8,H8300_GPIO_B1}, |
69 | {H8300_GPIO_P8,H8300_GPIO_B2},{H8300_GPIO_P8,H8300_GPIO_B3}, | |
70 | {H8300_GPIO_P8,H8300_GPIO_B4},{H8300_GPIO_P8,H8300_GPIO_B5}, | |
71 | {H8300_GPIO_PH,H8300_GPIO_B2},{H8300_GPIO_PH,H8300_GPIO_B3}, | |
72 | {H8300_GPIO_P2,H8300_GPIO_B0},{H8300_GPIO_P2,H8300_GPIO_B1}, | |
73 | {H8300_GPIO_P2,H8300_GPIO_B2},{H8300_GPIO_P2,H8300_GPIO_B3}, | |
74 | {H8300_GPIO_P2,H8300_GPIO_B4},{H8300_GPIO_P2,H8300_GPIO_B5}, | |
75 | {H8300_GPIO_P2,H8300_GPIO_B6},{H8300_GPIO_P2,H8300_GPIO_B7}, | |
76 | }; | |
77 | ||
78 | static short use_kmalloc = 0; | |
79 | ||
80 | extern unsigned long *interrupt_redirect_table; | |
81 | ||
82 | #define CPU_VECTOR ((unsigned long *)0x000000) | |
83 | #define ADDR_MASK (0xffffff) | |
84 | ||
85 | static inline unsigned long *get_vector_address(void) | |
86 | { | |
87 | volatile unsigned long *rom_vector = CPU_VECTOR; | |
88 | unsigned long base,tmp; | |
89 | int vec_no; | |
90 | ||
91 | base = rom_vector[EXT_IRQ0] & ADDR_MASK; | |
92 | ||
93 | /* check romvector format */ | |
94 | for (vec_no = EXT_IRQ1; vec_no <= EXT_IRQ15; vec_no++) { | |
95 | if ((base+(vec_no - EXT_IRQ0)*4) != (rom_vector[vec_no] & ADDR_MASK)) | |
96 | return NULL; | |
97 | } | |
98 | ||
99 | /* ramvector base address */ | |
100 | base -= EXT_IRQ0*4; | |
101 | ||
102 | /* writerble check */ | |
103 | tmp = ~(*(unsigned long *)base); | |
104 | (*(unsigned long *)base) = tmp; | |
105 | if ((*(unsigned long *)base) != tmp) | |
106 | return NULL; | |
107 | return (unsigned long *)base; | |
108 | } | |
109 | ||
110 | void __init init_IRQ(void) | |
111 | { | |
112 | #if defined(CONFIG_RAMKERNEL) | |
113 | int i; | |
114 | unsigned long *ramvec,*ramvec_p; | |
115 | unsigned long break_vec; | |
116 | ||
117 | ramvec = get_vector_address(); | |
118 | if (ramvec == NULL) | |
119 | panic("interrupt vector serup failed."); | |
120 | else | |
121 | printk("virtual vector at 0x%08lx\n",(unsigned long)ramvec); | |
122 | ||
123 | #if defined(CONFIG_GDB_DEBUG) | |
77bef30f | 124 | /* save original break vector */ |
1da177e4 LT |
125 | break_vec = ramvec[TRAP3_VEC]; |
126 | #else | |
127 | break_vec = VECTOR(trace_break); | |
128 | #endif | |
129 | ||
130 | /* create redirect table */ | |
131 | for (ramvec_p = ramvec, i = 0; i < NR_IRQS; i++) | |
132 | *ramvec_p++ = REDIRECT(interrupt_entry); | |
133 | ||
134 | /* set special vector */ | |
135 | ramvec[TRAP0_VEC] = VECTOR(system_call); | |
136 | ramvec[TRAP3_VEC] = break_vec; | |
137 | interrupt_redirect_table = ramvec; | |
138 | #ifdef DUMP_VECTOR | |
139 | ramvec_p = ramvec; | |
140 | for (i = 0; i < NR_IRQS; i++) { | |
141 | if ((i % 8) == 0) | |
142 | printk("\n%p: ",ramvec_p); | |
143 | printk("%p ",*ramvec_p); | |
144 | ramvec_p++; | |
145 | } | |
146 | printk("\n"); | |
147 | #endif | |
148 | #endif | |
149 | } | |
150 | ||
151 | int request_irq(unsigned int irq, | |
152 | irqreturn_t (*handler)(int, void *, struct pt_regs *), | |
153 | unsigned long flags, const char *devname, void *dev_id) | |
154 | { | |
155 | unsigned short ptn = 1 << (irq - EXT_IRQ0); | |
156 | irq_handler_t *irq_handle; | |
157 | if (irq < 0 || irq >= NR_IRQS) { | |
158 | printk("Incorrect IRQ %d from %s\n", irq, devname); | |
159 | return -EINVAL; | |
160 | } | |
161 | if (irq_list[irq]) | |
162 | return -EBUSY; /* already used */ | |
163 | if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) { | |
164 | /* initialize IRQ pin */ | |
165 | unsigned int port_no,bit_no; | |
166 | if (*(volatile unsigned short *)ITSR & ptn) { | |
167 | port_no = irq_assign_table1[irq - EXT_IRQ0].port_no; | |
168 | bit_no = irq_assign_table1[irq - EXT_IRQ0].bit_no; | |
169 | } else { | |
170 | port_no = irq_assign_table0[irq - EXT_IRQ0].port_no; | |
171 | bit_no = irq_assign_table0[irq - EXT_IRQ0].bit_no; | |
172 | } | |
173 | if (H8300_GPIO_RESERVE(port_no, bit_no) == 0) | |
174 | return -EBUSY; /* pin already use */ | |
175 | H8300_GPIO_DDR(port_no, bit_no, H8300_GPIO_INPUT); | |
176 | *(volatile unsigned short *)ISR &= ~ptn; /* ISR clear */ | |
177 | } | |
178 | ||
179 | if (use_kmalloc) | |
5cbded58 | 180 | irq_handle = kmalloc(sizeof(irq_handler_t), GFP_ATOMIC); |
1da177e4 | 181 | else { |
5e71c605 | 182 | /* use bootmem allocator */ |
1da177e4 LT |
183 | irq_handle = (irq_handler_t *)alloc_bootmem(sizeof(irq_handler_t)); |
184 | irq_handle = (irq_handler_t *)((unsigned long)irq_handle | 0x80000000); | |
185 | } | |
186 | ||
187 | if (irq_handle == NULL) | |
188 | return -ENOMEM; | |
189 | ||
190 | irq_handle->handler = handler; | |
191 | irq_handle->flags = flags; | |
192 | irq_handle->count = 0; | |
193 | irq_handle->dev_id = dev_id; | |
194 | irq_handle->devname = devname; | |
195 | irq_list[irq] = irq_handle; | |
b98d3396 | 196 | if (irq_handle->flags & IRQF_SAMPLE_RANDOM) |
1da177e4 LT |
197 | rand_initialize_irq(irq); |
198 | ||
199 | /* enable interrupt */ | |
200 | /* compatible i386 */ | |
201 | if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) | |
202 | *(volatile unsigned short *)IER |= ptn; | |
203 | return 0; | |
204 | } | |
205 | ||
206 | EXPORT_SYMBOL(request_irq); | |
207 | ||
208 | void free_irq(unsigned int irq, void *dev_id) | |
209 | { | |
210 | if (irq >= NR_IRQS) | |
211 | return; | |
212 | if (irq_list[irq]->dev_id != dev_id) | |
213 | printk("%s: Removing probably wrong IRQ %d from %s\n", | |
214 | __FUNCTION__, irq, irq_list[irq]->devname); | |
215 | if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) { | |
216 | /* disable interrupt & release IRQ pin */ | |
217 | unsigned short port_no,bit_no; | |
218 | *(volatile unsigned short *)ISR &= ~(1 << (irq - EXT_IRQ0)); | |
219 | *(volatile unsigned short *)IER |= 1 << (irq - EXT_IRQ0); | |
220 | if (*(volatile unsigned short *)ITSR & (1 << (irq - EXT_IRQ0))) { | |
221 | port_no = irq_assign_table1[irq - EXT_IRQ0].port_no; | |
222 | bit_no = irq_assign_table1[irq - EXT_IRQ0].bit_no; | |
223 | } else { | |
224 | port_no = irq_assign_table0[irq - EXT_IRQ0].port_no; | |
225 | bit_no = irq_assign_table0[irq - EXT_IRQ0].bit_no; | |
226 | } | |
227 | H8300_GPIO_FREE(port_no, bit_no); | |
228 | } | |
229 | if (((unsigned long)irq_list[irq] & 0x80000000) == 0) { | |
230 | kfree(irq_list[irq]); | |
231 | irq_list[irq] = NULL; | |
232 | } | |
233 | } | |
234 | ||
235 | EXPORT_SYMBOL(free_irq); | |
236 | ||
237 | unsigned long probe_irq_on (void) | |
238 | { | |
239 | return 0; | |
240 | } | |
241 | ||
242 | EXPORT_SYMBOL(probe_irq_on); | |
243 | ||
244 | int probe_irq_off (unsigned long irqs) | |
245 | { | |
246 | return 0; | |
247 | } | |
248 | ||
249 | EXPORT_SYMBOL(probe_irq_off); | |
250 | ||
251 | void enable_irq(unsigned int irq) | |
252 | { | |
253 | if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) | |
254 | *(volatile unsigned short *)IER |= 1 << (irq - EXT_IRQ0); | |
255 | } | |
256 | ||
257 | void disable_irq(unsigned int irq) | |
258 | { | |
259 | if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) | |
260 | *(volatile unsigned short *)IER &= ~(1 << (irq - EXT_IRQ0)); | |
261 | } | |
262 | ||
263 | asmlinkage void process_int(unsigned long vec, struct pt_regs *fp) | |
264 | { | |
265 | irq_enter(); | |
266 | /* ISR clear */ | |
267 | /* compatible i386 */ | |
268 | if (vec >= EXT_IRQ0 && vec <= EXT_IRQ15) | |
269 | *(volatile unsigned short *)ISR &= ~(1 << (vec - EXT_IRQ0)); | |
270 | if (vec < NR_IRQS) { | |
271 | if (irq_list[vec]) { | |
272 | irq_list[vec]->handler(vec, irq_list[vec]->dev_id, fp); | |
273 | irq_list[vec]->count++; | |
b98d3396 | 274 | if (irq_list[vec]->flags & IRQF_SAMPLE_RANDOM) |
1da177e4 LT |
275 | add_interrupt_randomness(vec); |
276 | } | |
277 | } else { | |
278 | BUG(); | |
279 | } | |
280 | irq_exit(); | |
281 | } | |
282 | ||
283 | int show_interrupts(struct seq_file *p, void *v) | |
284 | { | |
285 | int i = *(loff_t *) v; | |
286 | ||
287 | if ((i < NR_IRQS) && (irq_list[i] !=NULL)) { | |
288 | seq_printf(p, "%3d: %10u ",i,irq_list[i]->count); | |
289 | seq_printf(p, "%s\n", irq_list[i]->devname); | |
290 | } | |
291 | ||
292 | return 0; | |
293 | } | |
294 | ||
295 | void init_irq_proc(void) | |
296 | { | |
297 | } | |
298 | ||
299 | static int __init enable_kmalloc(void) | |
300 | { | |
301 | use_kmalloc = 1; | |
302 | return 0; | |
303 | } | |
304 | core_initcall(enable_kmalloc); |