| /* |
| * BRIEF MODULE DESCRIPTION |
| * Au1xxx irq map table |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the |
| * Free Software Foundation; either version 2 of the License, or (at your |
| * option) any later version. |
| * |
| * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED |
| * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF |
| * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN |
| * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
| * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON |
| * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
| * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 675 Mass Ave, Cambridge, MA 02139, USA. |
| */ |
| #include <linux/errno.h> |
| #include <linux/init.h> |
| #include <linux/irq.h> |
| #include <linux/kernel_stat.h> |
| #include <linux/module.h> |
| #include <linux/signal.h> |
| #include <linux/sched.h> |
| #include <linux/types.h> |
| #include <linux/interrupt.h> |
| #include <linux/ioport.h> |
| #include <linux/timex.h> |
| #include <linux/slab.h> |
| #include <linux/random.h> |
| #include <linux/delay.h> |
| |
| #include <asm/bitops.h> |
| #include <asm/bootinfo.h> |
| #include <asm/io.h> |
| #include <asm/mipsregs.h> |
| #include <asm/system.h> |
| #include <asm/mach-au1x00/au1000.h> |
| |
| #ifdef CONFIG_MIPS_PB1200 |
| #include <asm/mach-pb1x00/pb1200.h> |
| #endif |
| |
| #ifdef CONFIG_MIPS_DB1200 |
| #include <asm/mach-db1x00/db1200.h> |
| #define PB1200_INT_BEGIN DB1200_INT_BEGIN |
| #define PB1200_INT_END DB1200_INT_END |
| #endif |
| |
| au1xxx_irq_map_t __initdata au1xxx_irq_map[] = { |
| { AU1000_GPIO_7, INTC_INT_LOW_LEVEL, 0 }, // This is exteranl interrupt cascade |
| }; |
| |
| int __initdata au1xxx_nr_irqs = ARRAY_SIZE(au1xxx_irq_map); |
| |
| /* |
| * Support for External interrupts on the PbAu1200 Development platform. |
| */ |
| static volatile int pb1200_cascade_en=0; |
| |
| irqreturn_t pb1200_cascade_handler( int irq, void *dev_id) |
| { |
| unsigned short bisr = bcsr->int_status; |
| int extirq_nr = 0; |
| |
| /* Clear all the edge interrupts. This has no effect on level */ |
| bcsr->int_status = bisr; |
| for( ; bisr; bisr &= (bisr-1) ) |
| { |
| extirq_nr = (PB1200_INT_BEGIN-1) + au_ffs(bisr); |
| /* Ack and dispatch IRQ */ |
| do_IRQ(extirq_nr); |
| } |
| |
| return IRQ_RETVAL(1); |
| } |
| |
| inline void pb1200_enable_irq(unsigned int irq_nr) |
| { |
| bcsr->intset_mask = 1<<(irq_nr - PB1200_INT_BEGIN); |
| bcsr->intset = 1<<(irq_nr - PB1200_INT_BEGIN); |
| } |
| |
| inline void pb1200_disable_irq(unsigned int irq_nr) |
| { |
| bcsr->intclr_mask = 1<<(irq_nr - PB1200_INT_BEGIN); |
| bcsr->intclr = 1<<(irq_nr - PB1200_INT_BEGIN); |
| } |
| |
| static unsigned int pb1200_startup_irq( unsigned int irq_nr ) |
| { |
| if (++pb1200_cascade_en == 1) |
| { |
| request_irq(AU1000_GPIO_7, &pb1200_cascade_handler, |
| 0, "Pb1200 Cascade", (void *)&pb1200_cascade_handler ); |
| #ifdef CONFIG_MIPS_PB1200 |
| /* We have a problem with CPLD rev3. Enable a workaround */ |
| if( ((bcsr->whoami & BCSR_WHOAMI_CPLD)>>4) <= 3) |
| { |
| printk("\nWARNING!!!\n"); |
| printk("\nWARNING!!!\n"); |
| printk("\nWARNING!!!\n"); |
| printk("\nWARNING!!!\n"); |
| printk("\nWARNING!!!\n"); |
| printk("\nWARNING!!!\n"); |
| printk("Pb1200 must be at CPLD rev4. Please have Pb1200\n"); |
| printk("updated to latest revision. This software will not\n"); |
| printk("work on anything less than CPLD rev4\n"); |
| printk("\nWARNING!!!\n"); |
| printk("\nWARNING!!!\n"); |
| printk("\nWARNING!!!\n"); |
| printk("\nWARNING!!!\n"); |
| printk("\nWARNING!!!\n"); |
| printk("\nWARNING!!!\n"); |
| while(1); |
| } |
| #endif |
| } |
| pb1200_enable_irq(irq_nr); |
| return 0; |
| } |
| |
| static void pb1200_shutdown_irq( unsigned int irq_nr ) |
| { |
| pb1200_disable_irq(irq_nr); |
| if (--pb1200_cascade_en == 0) |
| { |
| free_irq(AU1000_GPIO_7,&pb1200_cascade_handler ); |
| } |
| return; |
| } |
| |
| static struct irq_chip external_irq_type = |
| { |
| #ifdef CONFIG_MIPS_PB1200 |
| .name = "Pb1200 Ext", |
| #endif |
| #ifdef CONFIG_MIPS_DB1200 |
| .name = "Db1200 Ext", |
| #endif |
| .startup = pb1200_startup_irq, |
| .shutdown = pb1200_shutdown_irq, |
| .ack = pb1200_disable_irq, |
| .mask = pb1200_disable_irq, |
| .mask_ack = pb1200_disable_irq, |
| .unmask = pb1200_enable_irq, |
| }; |
| |
| void _board_init_irq(void) |
| { |
| int irq_nr; |
| |
| for (irq_nr = PB1200_INT_BEGIN; irq_nr <= PB1200_INT_END; irq_nr++) |
| { |
| set_irq_chip_and_handler(irq_nr, &external_irq_type, |
| handle_level_irq); |
| pb1200_disable_irq(irq_nr); |
| } |
| |
| /* GPIO_7 can not be hooked here, so it is hooked upon first |
| request of any source attached to the cascade */ |
| } |
| |