score: cleanups: dead code, 0 as pointer, shadowed variables
[linux-2.6.git] / arch / score / kernel / irq.c
1 /*
2  * arch/score/kernel/irq.c
3  *
4  * Score Processor version.
5  *
6  * Copyright (C) 2009 Sunplus Core Technology Co., Ltd.
7  *  Chen Liqin <liqin.chen@sunplusct.com>
8  *  Lennox Wu <lennox.wu@sunplusct.com>
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, see the file COPYING, or write
22  * to the Free Software Foundation, Inc.,
23  * 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
24  */
25
26 #include <linux/interrupt.h>
27 #include <linux/kernel_stat.h>
28 #include <linux/seq_file.h>
29
30 #include <asm/io.h>
31
32 /*
33  * handles all normal device IRQs
34  */
35 asmlinkage void do_IRQ(int irq)
36 {
37         irq_enter();
38         generic_handle_irq(irq);
39         irq_exit();
40 }
41
42 static void score_mask(unsigned int irq_nr)
43 {
44         unsigned int irq_source = 63 - irq_nr;
45
46         if (irq_source < 32)
47                 __raw_writel((__raw_readl((void *)P_INT_MASKL) | \
48                         (1 << irq_source)), (void *)P_INT_MASKL);
49         else
50                 __raw_writel((__raw_readl((void *)P_INT_MASKH) | \
51                         (1 << (irq_source - 32))), (void *)P_INT_MASKH);
52 }
53
54 static void score_unmask(unsigned int irq_nr)
55 {
56         unsigned int irq_source = 63 - irq_nr;
57
58         if (irq_source < 32)
59                 __raw_writel((__raw_readl((void *)P_INT_MASKL) & \
60                         ~(1 << irq_source)), (void *)P_INT_MASKL);
61         else
62                 __raw_writel((__raw_readl((void *)P_INT_MASKH) & \
63                         ~(1 << (irq_source - 32))), (void *)P_INT_MASKH);
64 }
65
66 struct irq_chip score_irq_chip = {
67         .name           = "Score7-level",
68         .mask           = score_mask,
69         .mask_ack       = score_mask,
70         .unmask         = score_unmask,
71 };
72
73 /*
74  * initialise the interrupt system
75  */
76 void __init init_IRQ(void)
77 {
78         int index;
79         unsigned long target_addr;
80
81         for (index = 0; index < NR_IRQS; ++index)
82                 set_irq_chip_and_handler(index, &score_irq_chip,
83                                          handle_level_irq);
84
85         for (target_addr = IRQ_VECTOR_BASE_ADDR;
86                 target_addr <= IRQ_VECTOR_END_ADDR;
87                 target_addr += IRQ_VECTOR_SIZE)
88                 memcpy((void *)target_addr, \
89                         interrupt_exception_vector, IRQ_VECTOR_SIZE);
90
91         __raw_writel(0xffffffff, (void *)P_INT_MASKL);
92         __raw_writel(0xffffffff, (void *)P_INT_MASKH);
93
94         __asm__ __volatile__(
95                 "mtcr   %0, cr3\n\t"
96                 : : "r" (EXCEPTION_VECTOR_BASE_ADDR | \
97                         VECTOR_ADDRESS_OFFSET_MODE16));
98 }
99
100 /*
101  * Generic, controller-independent functions:
102  */
103 int show_interrupts(struct seq_file *p, void *v)
104 {
105         int i = *(loff_t *)v, cpu;
106         struct irqaction *action;
107         unsigned long flags;
108
109         if (i == 0) {
110                 seq_puts(p, "           ");
111                 for_each_online_cpu(cpu)
112                         seq_printf(p, "CPU%d       ", cpu);
113                 seq_putc(p, '\n');
114         }
115
116         if (i < NR_IRQS) {
117                 spin_lock_irqsave(&irq_desc[i].lock, flags);
118                 action = irq_desc[i].action;
119                 if (!action)
120                         goto unlock;
121
122                 seq_printf(p, "%3d: ", i);
123                 seq_printf(p, "%10u ", kstat_irqs(i));
124                 seq_printf(p, " %8s", irq_desc[i].chip->name ? : "-");
125                 seq_printf(p, "  %s", action->name);
126                 for (action = action->next; action; action = action->next)
127                         seq_printf(p, ", %s", action->name);
128
129                 seq_putc(p, '\n');
130 unlock:
131                 spin_unlock_irqrestore(&irq_desc[i].lock, flags);
132         }
133
134         return 0;
135 }