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