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Linux/arch/arm/mach-s3c2410/bast-irq.c

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  1 /* linux/arch/arm/mach-s3c2410/bast-irq.c
  2  *
  3  * Copyright (c) 2003,2005 Simtec Electronics
  4  *   Ben Dooks <ben@simtec.co.uk>
  5  *
  6  * http://www.simtec.co.uk/products/EB2410ITX/
  7  *
  8  * This program is free software; you can redistribute it and/or modify
  9  * it under the terms of the GNU General Public License as published by
 10  * the Free Software Foundation; either version 2 of the License, or
 11  * (at your option) any later version.
 12  *
 13  * This program is distributed in the hope that it will be useful,
 14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
 15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 16  * GNU General Public License for more details.
 17  *
 18  * You should have received a copy of the GNU General Public License
 19  * along with this program; if not, write to the Free Software
 20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 21 */
 22 
 23 
 24 #include <linux/init.h>
 25 #include <linux/module.h>
 26 #include <linux/ioport.h>
 27 #include <linux/sysdev.h>
 28 #include <linux/io.h>
 29 
 30 #include <asm/mach-types.h>
 31 
 32 #include <mach/hardware.h>
 33 #include <asm/irq.h>
 34 
 35 #include <asm/mach/irq.h>
 36 
 37 #include <mach/regs-irq.h>
 38 #include <mach/bast-map.h>
 39 #include <mach/bast-irq.h>
 40 
 41 #include <plat/irq.h>
 42 
 43 #if 0
 44 #include <asm/debug-ll.h>
 45 #endif
 46 
 47 #define irqdbf(x...)
 48 #define irqdbf2(x...)
 49 
 50 
 51 /* handle PC104 ISA interrupts from the system CPLD */
 52 
 53 /* table of ISA irq nos to the relevant mask... zero means
 54  * the irq is not implemented
 55 */
 56 static unsigned char bast_pc104_irqmasks[] = {
 57         0,   /* 0 */
 58         0,   /* 1 */
 59         0,   /* 2 */
 60         1,   /* 3 */
 61         0,   /* 4 */
 62         2,   /* 5 */
 63         0,   /* 6 */
 64         4,   /* 7 */
 65         0,   /* 8 */
 66         0,   /* 9 */
 67         8,   /* 10 */
 68         0,   /* 11 */
 69         0,   /* 12 */
 70         0,   /* 13 */
 71         0,   /* 14 */
 72         0,   /* 15 */
 73 };
 74 
 75 static unsigned char bast_pc104_irqs[] = { 3, 5, 7, 10 };
 76 
 77 static void
 78 bast_pc104_mask(unsigned int irqno)
 79 {
 80         unsigned long temp;
 81 
 82         temp = __raw_readb(BAST_VA_PC104_IRQMASK);
 83         temp &= ~bast_pc104_irqmasks[irqno];
 84         __raw_writeb(temp, BAST_VA_PC104_IRQMASK);
 85 }
 86 
 87 static void
 88 bast_pc104_maskack(unsigned int irqno)
 89 {
 90         struct irq_desc *desc = irq_desc + IRQ_ISA;
 91 
 92         bast_pc104_mask(irqno);
 93         desc->chip->ack(IRQ_ISA);
 94 }
 95 
 96 static void
 97 bast_pc104_unmask(unsigned int irqno)
 98 {
 99         unsigned long temp;
100 
101         temp = __raw_readb(BAST_VA_PC104_IRQMASK);
102         temp |= bast_pc104_irqmasks[irqno];
103         __raw_writeb(temp, BAST_VA_PC104_IRQMASK);
104 }
105 
106 static struct irq_chip  bast_pc104_chip = {
107         .mask        = bast_pc104_mask,
108         .unmask      = bast_pc104_unmask,
109         .ack         = bast_pc104_maskack
110 };
111 
112 static void
113 bast_irq_pc104_demux(unsigned int irq,
114                      struct irq_desc *desc)
115 {
116         unsigned int stat;
117         unsigned int irqno;
118         int i;
119 
120         stat = __raw_readb(BAST_VA_PC104_IRQREQ) & 0xf;
121 
122         if (unlikely(stat == 0)) {
123                 /* ack if we get an irq with nothing (ie, startup) */
124 
125                 desc = irq_desc + IRQ_ISA;
126                 desc->chip->ack(IRQ_ISA);
127         } else {
128                 /* handle the IRQ */
129 
130                 for (i = 0; stat != 0; i++, stat >>= 1) {
131                         if (stat & 1) {
132                                 irqno = bast_pc104_irqs[i];
133                                 generic_handle_irq(irqno);
134                         }
135                 }
136         }
137 }
138 
139 static __init int bast_irq_init(void)
140 {
141         unsigned int i;
142 
143         if (machine_is_bast()) {
144                 printk(KERN_INFO "BAST PC104 IRQ routing, (c) 2005 Simtec Electronics\n");
145 
146                 /* zap all the IRQs */
147 
148                 __raw_writeb(0x0, BAST_VA_PC104_IRQMASK);
149 
150                 set_irq_chained_handler(IRQ_ISA, bast_irq_pc104_demux);
151 
152                 /* register our IRQs */
153 
154                 for (i = 0; i < 4; i++) {
155                         unsigned int irqno = bast_pc104_irqs[i];
156 
157                         set_irq_chip(irqno, &bast_pc104_chip);
158                         set_irq_handler(irqno, handle_level_irq);
159                         set_irq_flags(irqno, IRQF_VALID);
160                 }
161         }
162 
163         return 0;
164 }
165 
166 arch_initcall(bast_irq_init);
167 

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