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e3ad1c23 PP |
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 | */ | |
26a940e2 | 25 | #include <linux/config.h> |
e3ad1c23 PP |
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 | ||
26a940e2 | 69 | irqreturn_t pb1200_cascade_handler( int irq, void *dev_id, struct pt_regs *regs) |
e3ad1c23 PP |
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 | } | |
26a940e2 | 82 | return IRQ_RETVAL(1); |
e3ad1c23 PP |
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, | |
26a940e2 | 102 | 0, "Pb1200 Cascade", (void *)&pb1200_cascade_handler ); |
e3ad1c23 PP |
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 |