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 __initdata au1xxx_irq_map[] = { 58 { AU1000_GPIO_7, INTC_INT_LOW_LEVEL, 0 }, // This is exteranl interrupt cascade 59}; 60 61int __initdata au1xxx_nr_irqs = ARRAY_SIZE(au1xxx_irq_map); 62 63/* 64 * Support for External interrupts on the PbAu1200 Development platform. 65 */ 66static volatile int pb1200_cascade_en=0; 67 68irqreturn_t pb1200_cascade_handler( int irq, void *dev_id) 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); 80 } 81 82 return IRQ_RETVAL(1); 83} 84 85inline 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 91inline 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 97static 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 if( ((bcsr->whoami & BCSR_WHOAMI_CPLD)>>4) <= 3) 105 { 106 printk("\nWARNING!!!\n"); 107 printk("\nWARNING!!!\n"); 108 printk("\nWARNING!!!\n"); 109 printk("\nWARNING!!!\n"); 110 printk("\nWARNING!!!\n"); 111 printk("\nWARNING!!!\n"); 112 printk("Pb1200 must be at CPLD rev4. Please have Pb1200\n"); 113 printk("updated to latest revision. This software will not\n"); 114 printk("work on anything less than CPLD rev4\n"); 115 printk("\nWARNING!!!\n"); 116 printk("\nWARNING!!!\n"); 117 printk("\nWARNING!!!\n"); 118 printk("\nWARNING!!!\n"); 119 printk("\nWARNING!!!\n"); 120 printk("\nWARNING!!!\n"); 121 while(1); 122 } 123#endif 124 } 125 pb1200_enable_irq(irq_nr); 126 return 0; 127} 128 129static void pb1200_shutdown_irq( unsigned int irq_nr ) 130{ 131 pb1200_disable_irq(irq_nr); 132 if (--pb1200_cascade_en == 0) 133 { 134 free_irq(AU1000_GPIO_7,&pb1200_cascade_handler ); 135 } 136 return; 137} 138 139static struct irq_chip external_irq_type = 140{ 141#ifdef CONFIG_MIPS_PB1200 142 .name = "Pb1200 Ext", 143#endif 144#ifdef CONFIG_MIPS_DB1200 145 .name = "Db1200 Ext", 146#endif 147 .startup = pb1200_startup_irq, 148 .shutdown = pb1200_shutdown_irq, 149 .ack = pb1200_disable_irq, 150 .mask = pb1200_disable_irq, 151 .mask_ack = pb1200_disable_irq, 152 .unmask = pb1200_enable_irq, 153}; 154 155void _board_init_irq(void) 156{ 157 int irq_nr; 158 159 for (irq_nr = PB1200_INT_BEGIN; irq_nr <= PB1200_INT_END; irq_nr++) 160 { 161 set_irq_chip_and_handler(irq_nr, &external_irq_type, 162 handle_level_irq); 163 pb1200_disable_irq(irq_nr); 164 } 165 166 /* GPIO_7 can not be hooked here, so it is hooked upon first 167 request of any source attached to the cascade */ 168} 169