aboutsummaryrefslogtreecommitdiffstats
path: root/arch/mips/au1000/pb1200/irqmap.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mips/au1000/pb1200/irqmap.c')
-rw-r--r--arch/mips/au1000/pb1200/irqmap.c180
1 files changed, 180 insertions, 0 deletions
diff --git a/arch/mips/au1000/pb1200/irqmap.c b/arch/mips/au1000/pb1200/irqmap.c
new file mode 100644
index 000000000000..2ec64e78aa01
--- /dev/null
+++ b/arch/mips/au1000/pb1200/irqmap.c
@@ -0,0 +1,180 @@
1/*
2 * BRIEF MODULE DESCRIPTION
3 * Au1xxx irq map table
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version.
9 *
10 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
11 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
12 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
13 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
14 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
15 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
16 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
17 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
18 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
19 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
20 *
21 * You should have received a copy of the GNU General Public License along
22 * with this program; if not, write to the Free Software Foundation, Inc.,
23 * 675 Mass Ave, Cambridge, MA 02139, USA.
24 */
25#include <linux/errno.h>
26#include <linux/init.h>
27#include <linux/irq.h>
28#include <linux/kernel_stat.h>
29#include <linux/module.h>
30#include <linux/signal.h>
31#include <linux/sched.h>
32#include <linux/types.h>
33#include <linux/interrupt.h>
34#include <linux/ioport.h>
35#include <linux/timex.h>
36#include <linux/slab.h>
37#include <linux/random.h>
38#include <linux/delay.h>
39
40#include <asm/bitops.h>
41#include <asm/bootinfo.h>
42#include <asm/io.h>
43#include <asm/mipsregs.h>
44#include <asm/system.h>
45#include <asm/mach-au1x00/au1000.h>
46
47#ifdef CONFIG_MIPS_PB1200
48#include <asm/mach-pb1x00/pb1200.h>
49#endif
50
51#ifdef CONFIG_MIPS_DB1200
52#include <asm/mach-db1x00/db1200.h>
53#define PB1200_INT_BEGIN DB1200_INT_BEGIN
54#define PB1200_INT_END DB1200_INT_END
55#endif
56
57au1xxx_irq_map_t au1xxx_irq_map[] = {
58 { AU1000_GPIO_7, INTC_INT_LOW_LEVEL, 0 }, // This is exteranl interrupt cascade
59};
60
61int au1xxx_nr_irqs = sizeof(au1xxx_irq_map)/sizeof(au1xxx_irq_map_t);
62
63/*
64 * Support for External interrupts on the PbAu1200 Development platform.
65 */
66static volatile int pb1200_cascade_en=0;
67
68void pb1200_cascade_handler( int irq, void *dev_id, struct pt_regs *regs)
69{
70 unsigned short bisr = bcsr->int_status;
71 int extirq_nr = 0;
72
73 /* Clear all the edge interrupts. This has no effect on level */
74 bcsr->int_status = bisr;
75 for( ; bisr; bisr &= (bisr-1) )
76 {
77 extirq_nr = (PB1200_INT_BEGIN-1) + au_ffs(bisr);
78 /* Ack and dispatch IRQ */
79 do_IRQ(extirq_nr,regs);
80 }
81}
82
83inline void pb1200_enable_irq(unsigned int irq_nr)
84{
85 bcsr->intset_mask = 1<<(irq_nr - PB1200_INT_BEGIN);
86 bcsr->intset = 1<<(irq_nr - PB1200_INT_BEGIN);
87}
88
89inline void pb1200_disable_irq(unsigned int irq_nr)
90{
91 bcsr->intclr_mask = 1<<(irq_nr - PB1200_INT_BEGIN);
92 bcsr->intclr = 1<<(irq_nr - PB1200_INT_BEGIN);
93}
94
95static unsigned int pb1200_startup_irq( unsigned int irq_nr )
96{
97 if (++pb1200_cascade_en == 1)
98 {
99 request_irq(AU1000_GPIO_7, &pb1200_cascade_handler,
100 0, "Pb1200 Cascade", &pb1200_cascade_handler );
101#ifdef CONFIG_MIPS_PB1200
102 /* We have a problem with CPLD rev3. Enable a workaround */
103 if( ((bcsr->whoami & BCSR_WHOAMI_CPLD)>>4) <= 3)
104 {
105 printk("\nWARNING!!!\n");
106 printk("\nWARNING!!!\n");
107 printk("\nWARNING!!!\n");
108 printk("\nWARNING!!!\n");
109 printk("\nWARNING!!!\n");
110 printk("\nWARNING!!!\n");
111 printk("Pb1200 must be at CPLD rev4. Please have Pb1200\n");
112 printk("updated to latest revision. This software will not\n");
113 printk("work on anything less than CPLD rev4\n");
114 printk("\nWARNING!!!\n");
115 printk("\nWARNING!!!\n");
116 printk("\nWARNING!!!\n");
117 printk("\nWARNING!!!\n");
118 printk("\nWARNING!!!\n");
119 printk("\nWARNING!!!\n");
120 while(1);
121 }
122#endif
123 }
124 pb1200_enable_irq(irq_nr);
125 return 0;
126}
127
128static void pb1200_shutdown_irq( unsigned int irq_nr )
129{
130 pb1200_disable_irq(irq_nr);
131 if (--pb1200_cascade_en == 0)
132 {
133 free_irq(AU1000_GPIO_7,&pb1200_cascade_handler );
134 }
135 return;
136}
137
138static inline void pb1200_mask_and_ack_irq(unsigned int irq_nr)
139{
140 pb1200_disable_irq( irq_nr );
141}
142
143static void pb1200_end_irq(unsigned int irq_nr)
144{
145 if (!(irq_desc[irq_nr].status & (IRQ_DISABLED|IRQ_INPROGRESS))) {
146 pb1200_enable_irq(irq_nr);
147 }
148}
149
150static struct hw_interrupt_type external_irq_type =
151{
152#ifdef CONFIG_MIPS_PB1200
153 "Pb1200 Ext",
154#endif
155#ifdef CONFIG_MIPS_DB1200
156 "Db1200 Ext",
157#endif
158 pb1200_startup_irq,
159 pb1200_shutdown_irq,
160 pb1200_enable_irq,
161 pb1200_disable_irq,
162 pb1200_mask_and_ack_irq,
163 pb1200_end_irq,
164 NULL
165};
166
167void _board_init_irq(void)
168{
169 int irq_nr;
170
171 for (irq_nr = PB1200_INT_BEGIN; irq_nr <= PB1200_INT_END; irq_nr++)
172 {
173 irq_desc[irq_nr].handler = &external_irq_type;
174 pb1200_disable_irq(irq_nr);
175 }
176
177 /* GPIO_7 can not be hooked here, so it is hooked upon first
178 request of any source attached to the cascade */
179}
180
generated by cgit v1.2.2 (git 2.25.0) at 2024-11-20 07:58:53 -0500