aboutsummaryrefslogtreecommitdiff
path: root/arch/h8300/platform/h8s/ints.c
blob: 5441cdd12a3996d46464380aba12679394cde975 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
/*
 * linux/arch/h8300/platform/h8s/ints.c
 *
 * Yoshinori Sato <ysato@users.sourceforge.jp>
 *
 * Based on linux/arch/$(ARCH)/platform/$(PLATFORM)/ints.c
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file COPYING in the main directory of this archive
 * for more details.
 *
 * Copyright 1996 Roman Zippel
 * Copyright 1999 D. Jeff Dionne <jeff@rt-control.com>
 */

#include <linux/module.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/kernel_stat.h>
#include <linux/seq_file.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/random.h>
#include <linux/hardirq.h>

#include <asm/system.h>
#include <asm/irq.h>
#include <asm/traps.h>
#include <asm/io.h>
#include <asm/setup.h>
#include <asm/gpio.h>
#include <asm/regs267x.h>
#include <asm/errno.h>

/*
 * This structure has only 4 elements for speed reasons
 */
typedef struct irq_handler {
	irqreturn_t (*handler)(int, void *, struct pt_regs *);
	int         flags;
	int         count;
	void	    *dev_id;
	const char  *devname;
} irq_handler_t;

static irq_handler_t *irq_list[NR_IRQS];

/* IRQ pin assignment */
struct irq_pins {
	unsigned char port_no;
	unsigned char bit_no;
};
/* ISTR = 0 */
const static struct irq_pins irq_assign_table0[16]={
        {H8300_GPIO_P5,H8300_GPIO_B0},{H8300_GPIO_P5,H8300_GPIO_B1},
	{H8300_GPIO_P5,H8300_GPIO_B2},{H8300_GPIO_P5,H8300_GPIO_B3},
	{H8300_GPIO_P5,H8300_GPIO_B4},{H8300_GPIO_P5,H8300_GPIO_B5},
	{H8300_GPIO_P5,H8300_GPIO_B6},{H8300_GPIO_P5,H8300_GPIO_B7},
	{H8300_GPIO_P6,H8300_GPIO_B0},{H8300_GPIO_P6,H8300_GPIO_B1},
	{H8300_GPIO_P6,H8300_GPIO_B2},{H8300_GPIO_P6,H8300_GPIO_B3},
	{H8300_GPIO_P6,H8300_GPIO_B4},{H8300_GPIO_P6,H8300_GPIO_B5},
	{H8300_GPIO_PF,H8300_GPIO_B1},{H8300_GPIO_PF,H8300_GPIO_B2},
};
/* ISTR = 1 */
const static struct irq_pins irq_assign_table1[16]={
	{H8300_GPIO_P8,H8300_GPIO_B0},{H8300_GPIO_P8,H8300_GPIO_B1},
	{H8300_GPIO_P8,H8300_GPIO_B2},{H8300_GPIO_P8,H8300_GPIO_B3},
	{H8300_GPIO_P8,H8300_GPIO_B4},{H8300_GPIO_P8,H8300_GPIO_B5},
	{H8300_GPIO_PH,H8300_GPIO_B2},{H8300_GPIO_PH,H8300_GPIO_B3},
	{H8300_GPIO_P2,H8300_GPIO_B0},{H8300_GPIO_P2,H8300_GPIO_B1},
	{H8300_GPIO_P2,H8300_GPIO_B2},{H8300_GPIO_P2,H8300_GPIO_B3},
	{H8300_GPIO_P2,H8300_GPIO_B4},{H8300_GPIO_P2,H8300_GPIO_B5},
	{H8300_GPIO_P2,H8300_GPIO_B6},{H8300_GPIO_P2,H8300_GPIO_B7},
};

static short use_kmalloc = 0;

extern unsigned long *interrupt_redirect_table;

#define CPU_VECTOR ((unsigned long *)0x000000)
#define ADDR_MASK (0xffffff)

static inline unsigned long *get_vector_address(void)
{
	volatile unsigned long *rom_vector = CPU_VECTOR;
	unsigned long base,tmp;
	int vec_no;

	base = rom_vector[EXT_IRQ0] & ADDR_MASK;
	
	/* check romvector format */
	for (vec_no = EXT_IRQ1; vec_no <= EXT_IRQ15; vec_no++) {
		if ((base+(vec_no - EXT_IRQ0)*4) != (rom_vector[vec_no] & ADDR_MASK))
			return NULL;
	}

	/* ramvector base address */
	base -= EXT_IRQ0*4;

	/* writerble check */
	tmp = ~(*(unsigned long *)base);
	(*(unsigned long *)base) = tmp;
	if ((*(unsigned long *)base) != tmp)
		return NULL;
	return (unsigned long *)base;
}

void __init init_IRQ(void)
{
#if defined(CONFIG_RAMKERNEL)
	int i;
	unsigned long *ramvec,*ramvec_p;
	unsigned long break_vec;

	ramvec = get_vector_address();
	if (ramvec == NULL)
		panic("interrupt vector serup failed.");
	else
		printk("virtual vector at 0x%08lx\n",(unsigned long)ramvec);

#if defined(CONFIG_GDB_DEBUG)
	/* save orignal break vector */
	break_vec = ramvec[TRAP3_VEC];
#else
	break_vec = VECTOR(trace_break);
#endif

	/* create redirect table */
	for (ramvec_p = ramvec, i = 0; i < NR_IRQS; i++)
		*ramvec_p++ = REDIRECT(interrupt_entry);

	/* set special vector */
	ramvec[TRAP0_VEC] = VECTOR(system_call);
	ramvec[TRAP3_VEC] = break_vec;
	interrupt_redirect_table = ramvec;
#ifdef DUMP_VECTOR
	ramvec_p = ramvec;
	for (i = 0; i < NR_IRQS; i++) {
		if ((i % 8) == 0)
			printk("\n%p: ",ramvec_p);
		printk("%p ",*ramvec_p);
		ramvec_p++;
	}
	printk("\n");
#endif
#endif
}

int request_irq(unsigned int irq,
		irqreturn_t (*handler)(int, void *, struct pt_regs *),
                unsigned long flags, const char *devname, void *dev_id)
{
	unsigned short ptn = 1 << (irq - EXT_IRQ0);
	irq_handler_t *irq_handle;
	if (irq < 0 || irq >= NR_IRQS) {
		printk("Incorrect IRQ %d from %s\n", irq, devname);
		return -EINVAL;
	}
	if (irq_list[irq])
		return -EBUSY; /* already used */
	if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
		/* initialize IRQ pin */
		unsigned int port_no,bit_no;
		if (*(volatile unsigned short *)ITSR & ptn) {
			port_no = irq_assign_table1[irq - EXT_IRQ0].port_no;
			bit_no = irq_assign_table1[irq - EXT_IRQ0].bit_no;
		} else {
			port_no = irq_assign_table0[irq - EXT_IRQ0].port_no;
			bit_no = irq_assign_table0[irq - EXT_IRQ0].bit_no;
		}
		if (H8300_GPIO_RESERVE(port_no, bit_no) == 0)
			return -EBUSY;                   /* pin already use */
		H8300_GPIO_DDR(port_no, bit_no, H8300_GPIO_INPUT);
		*(volatile unsigned short *)ISR &= ~ptn; /* ISR clear */
	}		

	if (use_kmalloc)
		irq_handle = (irq_handler_t *)kmalloc(sizeof(irq_handler_t), GFP_ATOMIC);
	else {
		/* use bootmem allocater */
		irq_handle = (irq_handler_t *)alloc_bootmem(sizeof(irq_handler_t));
		irq_handle = (irq_handler_t *)((unsigned long)irq_handle | 0x80000000);
	}

	if (irq_handle == NULL)
		return -ENOMEM;

	irq_handle->handler = handler;
	irq_handle->flags   = flags;
	irq_handle->count   = 0;
	irq_handle->dev_id  = dev_id;
	irq_handle->devname = devname;
	irq_list[irq] = irq_handle;
	if (irq_handle->flags & SA_SAMPLE_RANDOM)
		rand_initialize_irq(irq);
	
	/* enable interrupt */
	/* compatible i386  */
	if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15)
		*(volatile unsigned short *)IER |= ptn;
	return 0;
}

EXPORT_SYMBOL(request_irq);

void free_irq(unsigned int irq, void *dev_id)
{
	if (irq >= NR_IRQS)
		return;
	if (irq_list[irq]->dev_id != dev_id)
		printk("%s: Removing probably wrong IRQ %d from %s\n",
		       __FUNCTION__, irq, irq_list[irq]->devname);
	if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15) {
		/* disable interrupt & release IRQ pin */
		unsigned short port_no,bit_no;
		*(volatile unsigned short *)ISR &= ~(1 << (irq - EXT_IRQ0));
		*(volatile unsigned short *)IER |= 1 << (irq - EXT_IRQ0);
		if (*(volatile unsigned short *)ITSR & (1 << (irq - EXT_IRQ0))) {
			port_no = irq_assign_table1[irq - EXT_IRQ0].port_no;
			bit_no = irq_assign_table1[irq - EXT_IRQ0].bit_no;
		} else {
			port_no = irq_assign_table0[irq - EXT_IRQ0].port_no;
			bit_no = irq_assign_table0[irq - EXT_IRQ0].bit_no;
		}
		H8300_GPIO_FREE(port_no, bit_no);
	}
	if (((unsigned long)irq_list[irq] & 0x80000000) == 0) {
		kfree(irq_list[irq]);
		irq_list[irq] = NULL;
	}
}

EXPORT_SYMBOL(free_irq);

unsigned long probe_irq_on (void)
{
	return 0;
}

EXPORT_SYMBOL(probe_irq_on);

int probe_irq_off (unsigned long irqs)
{
	return 0;
}

EXPORT_SYMBOL(probe_irq_off);

void enable_irq(unsigned int irq)
{
	if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15)
		*(volatile unsigned short *)IER |= 1 << (irq - EXT_IRQ0);
}

void disable_irq(unsigned int irq)
{
	if (irq >= EXT_IRQ0 && irq <= EXT_IRQ15)
		*(volatile unsigned short *)IER &= ~(1 << (irq - EXT_IRQ0));
}

asmlinkage void process_int(unsigned long vec, struct pt_regs *fp)
{
	irq_enter();
	/* ISR clear       */
	/* compatible i386 */
	if (vec >= EXT_IRQ0 && vec <= EXT_IRQ15)
		*(volatile unsigned short *)ISR &= ~(1 << (vec - EXT_IRQ0));
	if (vec < NR_IRQS) {
		if (irq_list[vec]) {
			irq_list[vec]->handler(vec, irq_list[vec]->dev_id, fp);
			irq_list[vec]->count++;
			if (irq_list[vec]->flags & SA_SAMPLE_RANDOM)
				add_interrupt_randomness(vec);
		}
	} else {
		BUG();
	}
	irq_exit();
}

int show_interrupts(struct seq_file *p, void *v)
{
	int i = *(loff_t *) v;

	if ((i < NR_IRQS) && (irq_list[i] !=NULL)) {
		seq_printf(p, "%3d: %10u ",i,irq_list[i]->count);
		seq_printf(p, "%s\n", irq_list[i]->devname);
	}

	return 0;
}

void init_irq_proc(void)
{
}

static int __init enable_kmalloc(void)
{
	use_kmalloc = 1;
	return 0;
}
core_initcall(enable_kmalloc);