Updated pcmcia driver with pb1200 and db1200 support.
[linux-3.10.git] / arch / mips / au1000 / pb1200 / irqmap.c
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