ia64/linux-2.6.18-xen.hg

view arch/m68k/amiga/cia.c @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 831230e53067
children
line source
1 /*
2 * linux/arch/m68k/amiga/cia.c - CIA support
3 *
4 * Copyright (C) 1996 Roman Zippel
5 *
6 * The concept of some functions bases on the original Amiga OS function
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 */
13 #include <linux/types.h>
14 #include <linux/kernel.h>
15 #include <linux/sched.h>
16 #include <linux/errno.h>
17 #include <linux/kernel_stat.h>
18 #include <linux/init.h>
19 #include <linux/seq_file.h>
20 #include <linux/interrupt.h>
22 #include <asm/irq.h>
23 #include <asm/amigahw.h>
24 #include <asm/amigaints.h>
26 struct ciabase {
27 volatile struct CIA *cia;
28 unsigned char icr_mask, icr_data;
29 unsigned short int_mask;
30 int handler_irq, cia_irq, server_irq;
31 char *name;
32 } ciaa_base = {
33 .cia = &ciaa,
34 .int_mask = IF_PORTS,
35 .handler_irq = IRQ_AMIGA_PORTS,
36 .cia_irq = IRQ_AMIGA_CIAA,
37 .name = "CIAA"
38 }, ciab_base = {
39 .cia = &ciab,
40 .int_mask = IF_EXTER,
41 .handler_irq = IRQ_AMIGA_EXTER,
42 .cia_irq = IRQ_AMIGA_CIAB,
43 .name = "CIAB"
44 };
46 /*
47 * Cause or clear CIA interrupts, return old interrupt status.
48 */
50 unsigned char cia_set_irq(struct ciabase *base, unsigned char mask)
51 {
52 unsigned char old;
54 old = (base->icr_data |= base->cia->icr);
55 if (mask & CIA_ICR_SETCLR)
56 base->icr_data |= mask;
57 else
58 base->icr_data &= ~mask;
59 if (base->icr_data & base->icr_mask)
60 amiga_custom.intreq = IF_SETCLR | base->int_mask;
61 return old & base->icr_mask;
62 }
64 /*
65 * Enable or disable CIA interrupts, return old interrupt mask,
66 */
68 unsigned char cia_able_irq(struct ciabase *base, unsigned char mask)
69 {
70 unsigned char old;
72 old = base->icr_mask;
73 base->icr_data |= base->cia->icr;
74 base->cia->icr = mask;
75 if (mask & CIA_ICR_SETCLR)
76 base->icr_mask |= mask;
77 else
78 base->icr_mask &= ~mask;
79 base->icr_mask &= CIA_ICR_ALL;
80 if (base->icr_data & base->icr_mask)
81 amiga_custom.intreq = IF_SETCLR | base->int_mask;
82 return old;
83 }
85 static irqreturn_t cia_handler(int irq, void *dev_id, struct pt_regs *fp)
86 {
87 struct ciabase *base = (struct ciabase *)dev_id;
88 int mach_irq;
89 unsigned char ints;
91 mach_irq = base->cia_irq;
92 ints = cia_set_irq(base, CIA_ICR_ALL);
93 amiga_custom.intreq = base->int_mask;
94 for (; ints; mach_irq++, ints >>= 1) {
95 if (ints & 1)
96 m68k_handle_int(mach_irq, fp);
97 }
98 return IRQ_HANDLED;
99 }
101 static void cia_enable_irq(unsigned int irq)
102 {
103 unsigned char mask;
105 if (irq >= IRQ_AMIGA_CIAB) {
106 mask = 1 << (irq - IRQ_AMIGA_CIAB);
107 cia_set_irq(&ciab_base, mask);
108 cia_able_irq(&ciab_base, CIA_ICR_SETCLR | mask);
109 } else {
110 mask = 1 << (irq - IRQ_AMIGA_CIAA);
111 cia_set_irq(&ciaa_base, mask);
112 cia_able_irq(&ciaa_base, CIA_ICR_SETCLR | mask);
113 }
114 }
116 static void cia_disable_irq(unsigned int irq)
117 {
118 if (irq >= IRQ_AMIGA_CIAB)
119 cia_able_irq(&ciab_base, 1 << (irq - IRQ_AMIGA_CIAB));
120 else
121 cia_able_irq(&ciaa_base, 1 << (irq - IRQ_AMIGA_CIAA));
122 }
124 static struct irq_controller cia_irq_controller = {
125 .name = "cia",
126 .lock = SPIN_LOCK_UNLOCKED,
127 .enable = cia_enable_irq,
128 .disable = cia_disable_irq,
129 };
131 /*
132 * Override auto irq 2 & 6 and use them as general chain
133 * for external interrupts, we link the CIA interrupt sources
134 * into this chain.
135 */
137 static void auto_enable_irq(unsigned int irq)
138 {
139 switch (irq) {
140 case IRQ_AUTO_2:
141 amiga_custom.intena = IF_SETCLR | IF_PORTS;
142 break;
143 case IRQ_AUTO_6:
144 amiga_custom.intena = IF_SETCLR | IF_EXTER;
145 break;
146 }
147 }
149 static void auto_disable_irq(unsigned int irq)
150 {
151 switch (irq) {
152 case IRQ_AUTO_2:
153 amiga_custom.intena = IF_PORTS;
154 break;
155 case IRQ_AUTO_6:
156 amiga_custom.intena = IF_EXTER;
157 break;
158 }
159 }
161 static struct irq_controller auto_irq_controller = {
162 .name = "auto",
163 .lock = SPIN_LOCK_UNLOCKED,
164 .enable = auto_enable_irq,
165 .disable = auto_disable_irq,
166 };
168 void __init cia_init_IRQ(struct ciabase *base)
169 {
170 m68k_setup_irq_controller(&cia_irq_controller, base->cia_irq, CIA_IRQS);
172 /* clear any pending interrupt and turn off all interrupts */
173 cia_set_irq(base, CIA_ICR_ALL);
174 cia_able_irq(base, CIA_ICR_ALL);
176 /* override auto int and install CIA handler */
177 m68k_setup_irq_controller(&auto_irq_controller, base->handler_irq, 1);
178 m68k_irq_startup(base->handler_irq);
179 request_irq(base->handler_irq, cia_handler, IRQF_SHARED, base->name, base);
180 }