Pete Popov | e3ad1c2 | 2005-03-01 06:33:16 +0000 | [diff] [blame] | 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 | */ |
Pete Popov | 26a940e | 2005-09-15 08:03:12 +0000 | [diff] [blame] | 25 | #include <linux/config.h> |
Pete Popov | e3ad1c2 | 2005-03-01 06:33:16 +0000 | [diff] [blame] | 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 | |
Herbert Valerio Riedel | a643d2b | 2006-05-07 15:48:25 +0200 | [diff] [blame^] | 58 | au1xxx_irq_map_t __initdata au1xxx_irq_map[] = { |
Pete Popov | e3ad1c2 | 2005-03-01 06:33:16 +0000 | [diff] [blame] | 59 | { AU1000_GPIO_7, INTC_INT_LOW_LEVEL, 0 }, // This is exteranl interrupt cascade |
| 60 | }; |
| 61 | |
Herbert Valerio Riedel | a643d2b | 2006-05-07 15:48:25 +0200 | [diff] [blame^] | 62 | int __initdata au1xxx_nr_irqs = ARRAY_SIZE(au1xxx_irq_map); |
Pete Popov | e3ad1c2 | 2005-03-01 06:33:16 +0000 | [diff] [blame] | 63 | |
| 64 | /* |
| 65 | * Support for External interrupts on the PbAu1200 Development platform. |
| 66 | */ |
| 67 | static volatile int pb1200_cascade_en=0; |
| 68 | |
Pete Popov | 26a940e | 2005-09-15 08:03:12 +0000 | [diff] [blame] | 69 | irqreturn_t pb1200_cascade_handler( int irq, void *dev_id, struct pt_regs *regs) |
Pete Popov | e3ad1c2 | 2005-03-01 06:33:16 +0000 | [diff] [blame] | 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 | } |
Pete Popov | 26a940e | 2005-09-15 08:03:12 +0000 | [diff] [blame] | 82 | return IRQ_RETVAL(1); |
Pete Popov | e3ad1c2 | 2005-03-01 06:33:16 +0000 | [diff] [blame] | 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, |
Pete Popov | 26a940e | 2005-09-15 08:03:12 +0000 | [diff] [blame] | 102 | 0, "Pb1200 Cascade", (void *)&pb1200_cascade_handler ); |
Pete Popov | e3ad1c2 | 2005-03-01 06:33:16 +0000 | [diff] [blame] | 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 | |