diff options
Diffstat (limited to 'arch/mips/alchemy/devboards/pb1200/irqmap.c')
| -rw-r--r-- | arch/mips/alchemy/devboards/pb1200/irqmap.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/arch/mips/alchemy/devboards/pb1200/irqmap.c b/arch/mips/alchemy/devboards/pb1200/irqmap.c new file mode 100644 index 00000000000..2a505ad8715 --- /dev/null +++ b/arch/mips/alchemy/devboards/pb1200/irqmap.c @@ -0,0 +1,160 @@ +/* + * 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/init.h> +#include <linux/interrupt.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 + +struct au1xxx_irqmap __initdata au1xxx_irq_map[] = { + /* This is external interrupt cascade */ + { AU1000_GPIO_7, INTC_INT_LOW_LEVEL, 0 }, +}; + +int __initdata au1xxx_nr_irqs = ARRAY_SIZE(au1xxx_irq_map); + +/* + * Support for External interrupts on the Pb1200 Development platform. + */ +static volatile int pb1200_cascade_en; + +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 + __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_setup_cascade(void) +{ + return request_irq(AU1000_GPIO_7, &pb1200_cascade_handler, + 0, "Pb1200 Cascade", &pb1200_cascade_handler); +} + +static unsigned int pb1200_startup_irq(unsigned int irq) +{ + if (++pb1200_cascade_en == 1) { + int res; + + res = pb1200_setup_cascade(); + if (res) + return res; + } + + pb1200_enable_irq(irq); + + return 0; +} + +static void pb1200_shutdown_irq(unsigned int irq) +{ + pb1200_disable_irq(irq); + if (--pb1200_cascade_en == 0) + free_irq(AU1000_GPIO_7, &pb1200_cascade_handler); +} + +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) +{ + unsigned int irq; + +#ifdef CONFIG_MIPS_PB1200 + /* We have a problem with CPLD rev 3. */ + if (((bcsr->whoami & BCSR_WHOAMI_CPLD) >> 4) <= 3) { + printk(KERN_ERR "WARNING!!!\n"); + printk(KERN_ERR "WARNING!!!\n"); + printk(KERN_ERR "WARNING!!!\n"); + printk(KERN_ERR "WARNING!!!\n"); + printk(KERN_ERR "WARNING!!!\n"); + printk(KERN_ERR "WARNING!!!\n"); + printk(KERN_ERR "Pb1200 must be at CPLD rev 4. Please have Pb1200\n"); + printk(KERN_ERR "updated to latest revision. This software will\n"); + printk(KERN_ERR "not work on anything less than CPLD rev 4.\n"); + printk(KERN_ERR "WARNING!!!\n"); + printk(KERN_ERR "WARNING!!!\n"); + printk(KERN_ERR "WARNING!!!\n"); + printk(KERN_ERR "WARNING!!!\n"); + printk(KERN_ERR "WARNING!!!\n"); + printk(KERN_ERR "WARNING!!!\n"); + panic("Game over. Your score is 0."); + } +#endif + + for (irq = PB1200_INT_BEGIN; irq <= PB1200_INT_END; irq++) { + set_irq_chip_and_handler(irq, &external_irq_type, + handle_level_irq); + pb1200_disable_irq(irq); + } + + /* + * GPIO_7 can not be hooked here, so it is hooked upon first + * request of any source attached to the cascade. + */ +} |