diff options
Diffstat (limited to 'arch/mips/au1000/pb1200/irqmap.c')
-rw-r--r-- | arch/mips/au1000/pb1200/irqmap.c | 182 |
1 files changed, 182 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..59e70e5cf325 --- /dev/null +++ b/arch/mips/au1000/pb1200/irqmap.c | |||
@@ -0,0 +1,182 @@ | |||
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/config.h> | ||
26 | #include <linux/errno.h> | ||
27 | #include <linux/init.h> | ||
28 | #include <linux/irq.h> | ||
29 | #include <linux/kernel_stat.h> | ||
30 | #include <linux/module.h> | ||
31 | #include <linux/signal.h> | ||
32 | #include <linux/sched.h> | ||
33 | #include <linux/types.h> | ||
34 | #include <linux/interrupt.h> | ||
35 | #include <linux/ioport.h> | ||
36 | #include <linux/timex.h> | ||
37 | #include <linux/slab.h> | ||
38 | #include <linux/random.h> | ||
39 | #include <linux/delay.h> | ||
40 | |||
41 | #include <asm/bitops.h> | ||
42 | #include <asm/bootinfo.h> | ||
43 | #include <asm/io.h> | ||
44 | #include <asm/mipsregs.h> | ||
45 | #include <asm/system.h> | ||
46 | #include <asm/mach-au1x00/au1000.h> | ||
47 | |||
48 | #ifdef CONFIG_MIPS_PB1200 | ||
49 | #include <asm/mach-pb1x00/pb1200.h> | ||
50 | #endif | ||
51 | |||
52 | #ifdef CONFIG_MIPS_DB1200 | ||
53 | #include <asm/mach-db1x00/db1200.h> | ||
54 | #define PB1200_INT_BEGIN DB1200_INT_BEGIN | ||
55 | #define PB1200_INT_END DB1200_INT_END | ||
56 | #endif | ||
57 | |||
58 | au1xxx_irq_map_t au1xxx_irq_map[] = { | ||
59 | { AU1000_GPIO_7, INTC_INT_LOW_LEVEL, 0 }, // This is exteranl interrupt cascade | ||
60 | }; | ||
61 | |||
62 | int au1xxx_nr_irqs = sizeof(au1xxx_irq_map)/sizeof(au1xxx_irq_map_t); | ||
63 | |||
64 | /* | ||
65 | * Support for External interrupts on the PbAu1200 Development platform. | ||
66 | */ | ||
67 | static volatile int pb1200_cascade_en=0; | ||
68 | |||
69 | irqreturn_t pb1200_cascade_handler( int irq, void *dev_id, struct pt_regs *regs) | ||
70 | { | ||
71 | unsigned short bisr = bcsr->int_status; | ||
72 | int extirq_nr = 0; | ||
73 | |||
74 | /* Clear all the edge interrupts. This has no effect on level */ | ||
75 | bcsr->int_status = bisr; | ||
76 | for( ; bisr; bisr &= (bisr-1) ) | ||
77 | { | ||
78 | extirq_nr = (PB1200_INT_BEGIN-1) + au_ffs(bisr); | ||
79 | /* Ack and dispatch IRQ */ | ||
80 | do_IRQ(extirq_nr,regs); | ||
81 | } | ||
82 | return IRQ_RETVAL(1); | ||
83 | } | ||
84 | |||
85 | inline void pb1200_enable_irq(unsigned int irq_nr) | ||
86 | { | ||
87 | bcsr->intset_mask = 1<<(irq_nr - PB1200_INT_BEGIN); | ||
88 | bcsr->intset = 1<<(irq_nr - PB1200_INT_BEGIN); | ||
89 | } | ||
90 | |||
91 | inline void pb1200_disable_irq(unsigned int irq_nr) | ||
92 | { | ||
93 | bcsr->intclr_mask = 1<<(irq_nr - PB1200_INT_BEGIN); | ||
94 | bcsr->intclr = 1<<(irq_nr - PB1200_INT_BEGIN); | ||
95 | } | ||
96 | |||
97 | static unsigned int pb1200_startup_irq( unsigned int irq_nr ) | ||
98 | { | ||
99 | if (++pb1200_cascade_en == 1) | ||
100 | { | ||
101 | request_irq(AU1000_GPIO_7, &pb1200_cascade_handler, | ||
102 | 0, "Pb1200 Cascade", (void *)&pb1200_cascade_handler ); | ||
103 | #ifdef CONFIG_MIPS_PB1200 | ||
104 | /* We have a problem with CPLD rev3. Enable a workaround */ | ||
105 | if( ((bcsr->whoami & BCSR_WHOAMI_CPLD)>>4) <= 3) | ||
106 | { | ||
107 | printk("\nWARNING!!!\n"); | ||
108 | printk("\nWARNING!!!\n"); | ||
109 | printk("\nWARNING!!!\n"); | ||
110 | printk("\nWARNING!!!\n"); | ||
111 | printk("\nWARNING!!!\n"); | ||
112 | printk("\nWARNING!!!\n"); | ||
113 | printk("Pb1200 must be at CPLD rev4. Please have Pb1200\n"); | ||
114 | printk("updated to latest revision. This software will not\n"); | ||
115 | printk("work on anything less than CPLD rev4\n"); | ||
116 | printk("\nWARNING!!!\n"); | ||
117 | printk("\nWARNING!!!\n"); | ||
118 | printk("\nWARNING!!!\n"); | ||
119 | printk("\nWARNING!!!\n"); | ||
120 | printk("\nWARNING!!!\n"); | ||
121 | printk("\nWARNING!!!\n"); | ||
122 | while(1); | ||
123 | } | ||
124 | #endif | ||
125 | } | ||
126 | pb1200_enable_irq(irq_nr); | ||
127 | return 0; | ||
128 | } | ||
129 | |||
130 | static void pb1200_shutdown_irq( unsigned int irq_nr ) | ||
131 | { | ||
132 | pb1200_disable_irq(irq_nr); | ||
133 | if (--pb1200_cascade_en == 0) | ||
134 | { | ||
135 | free_irq(AU1000_GPIO_7,&pb1200_cascade_handler ); | ||
136 | } | ||
137 | return; | ||
138 | } | ||
139 | |||
140 | static inline void pb1200_mask_and_ack_irq(unsigned int irq_nr) | ||
141 | { | ||
142 | pb1200_disable_irq( irq_nr ); | ||
143 | } | ||
144 | |||
145 | static void pb1200_end_irq(unsigned int irq_nr) | ||
146 | { | ||
147 | if (!(irq_desc[irq_nr].status & (IRQ_DISABLED|IRQ_INPROGRESS))) { | ||
148 | pb1200_enable_irq(irq_nr); | ||
149 | } | ||
150 | } | ||
151 | |||
152 | static struct hw_interrupt_type external_irq_type = | ||
153 | { | ||
154 | #ifdef CONFIG_MIPS_PB1200 | ||
155 | "Pb1200 Ext", | ||
156 | #endif | ||
157 | #ifdef CONFIG_MIPS_DB1200 | ||
158 | "Db1200 Ext", | ||
159 | #endif | ||
160 | pb1200_startup_irq, | ||
161 | pb1200_shutdown_irq, | ||
162 | pb1200_enable_irq, | ||
163 | pb1200_disable_irq, | ||
164 | pb1200_mask_and_ack_irq, | ||
165 | pb1200_end_irq, | ||
166 | NULL | ||
167 | }; | ||
168 | |||
169 | void _board_init_irq(void) | ||
170 | { | ||
171 | int irq_nr; | ||
172 | |||
173 | for (irq_nr = PB1200_INT_BEGIN; irq_nr <= PB1200_INT_END; irq_nr++) | ||
174 | { | ||
175 | irq_desc[irq_nr].handler = &external_irq_type; | ||
176 | pb1200_disable_irq(irq_nr); | ||
177 | } | ||
178 | |||
179 | /* GPIO_7 can not be hooked here, so it is hooked upon first | ||
180 | request of any source attached to the cascade */ | ||
181 | } | ||
182 | |||