161 строка
4.5 KiB
C
161 строка
4.5 KiB
C
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/*
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* BRIEF MODULE DESCRIPTION
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* Au1xxx irq map table
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
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* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
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* NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <asm/mach-au1x00/au1000.h>
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#ifdef CONFIG_MIPS_PB1200
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#include <asm/mach-pb1x00/pb1200.h>
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#endif
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#ifdef CONFIG_MIPS_DB1200
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#include <asm/mach-db1x00/db1200.h>
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#define PB1200_INT_BEGIN DB1200_INT_BEGIN
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#define PB1200_INT_END DB1200_INT_END
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#endif
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struct au1xxx_irqmap __initdata au1xxx_irq_map[] = {
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/* This is external interrupt cascade */
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{ AU1000_GPIO_7, INTC_INT_LOW_LEVEL, 0 },
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};
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int __initdata au1xxx_nr_irqs = ARRAY_SIZE(au1xxx_irq_map);
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/*
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* Support for External interrupts on the Pb1200 Development platform.
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*/
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static volatile int pb1200_cascade_en;
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irqreturn_t pb1200_cascade_handler(int irq, void *dev_id)
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{
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unsigned short bisr = bcsr->int_status;
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int extirq_nr = 0;
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/* Clear all the edge interrupts. This has no effect on level. */
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bcsr->int_status = bisr;
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for ( ; bisr; bisr &= bisr - 1) {
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extirq_nr = PB1200_INT_BEGIN + __ffs(bisr);
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/* Ack and dispatch IRQ */
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do_IRQ(extirq_nr);
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}
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return IRQ_RETVAL(1);
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}
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inline void pb1200_enable_irq(unsigned int irq_nr)
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{
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bcsr->intset_mask = 1 << (irq_nr - PB1200_INT_BEGIN);
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bcsr->intset = 1 << (irq_nr - PB1200_INT_BEGIN);
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}
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inline void pb1200_disable_irq(unsigned int irq_nr)
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{
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bcsr->intclr_mask = 1 << (irq_nr - PB1200_INT_BEGIN);
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bcsr->intclr = 1 << (irq_nr - PB1200_INT_BEGIN);
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}
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static unsigned int pb1200_setup_cascade(void)
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{
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return request_irq(AU1000_GPIO_7, &pb1200_cascade_handler,
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0, "Pb1200 Cascade", &pb1200_cascade_handler);
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}
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static unsigned int pb1200_startup_irq(unsigned int irq)
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{
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if (++pb1200_cascade_en == 1) {
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int res;
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res = pb1200_setup_cascade();
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if (res)
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return res;
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}
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pb1200_enable_irq(irq);
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return 0;
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}
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static void pb1200_shutdown_irq(unsigned int irq)
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{
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pb1200_disable_irq(irq);
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if (--pb1200_cascade_en == 0)
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free_irq(AU1000_GPIO_7, &pb1200_cascade_handler);
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}
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static struct irq_chip external_irq_type = {
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#ifdef CONFIG_MIPS_PB1200
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.name = "Pb1200 Ext",
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#endif
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#ifdef CONFIG_MIPS_DB1200
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.name = "Db1200 Ext",
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#endif
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.startup = pb1200_startup_irq,
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.shutdown = pb1200_shutdown_irq,
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.ack = pb1200_disable_irq,
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.mask = pb1200_disable_irq,
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.mask_ack = pb1200_disable_irq,
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.unmask = pb1200_enable_irq,
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};
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void _board_init_irq(void)
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{
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unsigned int irq;
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#ifdef CONFIG_MIPS_PB1200
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/* We have a problem with CPLD rev 3. */
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if (((bcsr->whoami & BCSR_WHOAMI_CPLD) >> 4) <= 3) {
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printk(KERN_ERR "WARNING!!!\n");
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printk(KERN_ERR "WARNING!!!\n");
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printk(KERN_ERR "WARNING!!!\n");
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printk(KERN_ERR "WARNING!!!\n");
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printk(KERN_ERR "WARNING!!!\n");
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printk(KERN_ERR "WARNING!!!\n");
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printk(KERN_ERR "Pb1200 must be at CPLD rev 4. Please have Pb1200\n");
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printk(KERN_ERR "updated to latest revision. This software will\n");
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printk(KERN_ERR "not work on anything less than CPLD rev 4.\n");
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printk(KERN_ERR "WARNING!!!\n");
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printk(KERN_ERR "WARNING!!!\n");
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printk(KERN_ERR "WARNING!!!\n");
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printk(KERN_ERR "WARNING!!!\n");
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printk(KERN_ERR "WARNING!!!\n");
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printk(KERN_ERR "WARNING!!!\n");
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panic("Game over. Your score is 0.");
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}
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#endif
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for (irq = PB1200_INT_BEGIN; irq <= PB1200_INT_END; irq++) {
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set_irq_chip_and_handler(irq, &external_irq_type,
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handle_level_irq);
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pb1200_disable_irq(irq);
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}
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/*
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* GPIO_7 can not be hooked here, so it is hooked upon first
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* request of any source attached to the cascade.
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*/
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}
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