173b4390fSRalf Baechle /* 273b4390fSRalf Baechle * This program is free software; you can redistribute it and/or modify it 373b4390fSRalf Baechle * under the terms of the GNU General Public License as published by the 473b4390fSRalf Baechle * Free Software Foundation; either version 2 of the License, or (at your 573b4390fSRalf Baechle * option) any later version. 673b4390fSRalf Baechle * 773b4390fSRalf Baechle * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 873b4390fSRalf Baechle * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 973b4390fSRalf Baechle * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 1073b4390fSRalf Baechle * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 1173b4390fSRalf Baechle * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 1273b4390fSRalf Baechle * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 1373b4390fSRalf Baechle * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 1473b4390fSRalf Baechle * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 1573b4390fSRalf Baechle * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 1673b4390fSRalf Baechle * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 1773b4390fSRalf Baechle * 1873b4390fSRalf Baechle * You should have received a copy of the GNU General Public License along 1973b4390fSRalf Baechle * with this program; if not, write to the Free Software Foundation, Inc., 2073b4390fSRalf Baechle * 675 Mass Ave, Cambridge, MA 02139, USA. 2173b4390fSRalf Baechle * 2273b4390fSRalf Baechle * Copyright 2002 MontaVista Software Inc. 2373b4390fSRalf Baechle * Author: MontaVista Software, Inc. 2473b4390fSRalf Baechle * stevel@mvista.com or source@mvista.com 2573b4390fSRalf Baechle */ 2673b4390fSRalf Baechle 2773b4390fSRalf Baechle #include <linux/bitops.h> 2873b4390fSRalf Baechle #include <linux/errno.h> 2973b4390fSRalf Baechle #include <linux/init.h> 3073b4390fSRalf Baechle #include <linux/io.h> 3173b4390fSRalf Baechle #include <linux/kernel_stat.h> 3273b4390fSRalf Baechle #include <linux/module.h> 3373b4390fSRalf Baechle #include <linux/signal.h> 3473b4390fSRalf Baechle #include <linux/sched.h> 3573b4390fSRalf Baechle #include <linux/types.h> 3673b4390fSRalf Baechle #include <linux/interrupt.h> 3773b4390fSRalf Baechle #include <linux/ioport.h> 3873b4390fSRalf Baechle #include <linux/timex.h> 3973b4390fSRalf Baechle #include <linux/slab.h> 4073b4390fSRalf Baechle #include <linux/random.h> 4173b4390fSRalf Baechle #include <linux/delay.h> 4273b4390fSRalf Baechle 4373b4390fSRalf Baechle #include <asm/bootinfo.h> 4473b4390fSRalf Baechle #include <asm/time.h> 4573b4390fSRalf Baechle #include <asm/mipsregs.h> 4673b4390fSRalf Baechle #include <asm/system.h> 4773b4390fSRalf Baechle 48606a083bSFlorian Fainelli #include <asm/mach-rc32434/irq.h> 494aa0f4d7SPhil Sutter #include <asm/mach-rc32434/gpio.h> 5073b4390fSRalf Baechle 5173b4390fSRalf Baechle struct intr_group { 5273b4390fSRalf Baechle u32 mask; /* mask of valid bits in pending/mask registers */ 5373b4390fSRalf Baechle volatile u32 *base_addr; 5473b4390fSRalf Baechle }; 5573b4390fSRalf Baechle 5673b4390fSRalf Baechle #define RC32434_NR_IRQS (GROUP4_IRQ_BASE + 32) 5773b4390fSRalf Baechle 5873b4390fSRalf Baechle #if (NR_IRQS < RC32434_NR_IRQS) 5973b4390fSRalf Baechle #error Too little irqs defined. Did you override <asm/irq.h> ? 6073b4390fSRalf Baechle #endif 6173b4390fSRalf Baechle 6273b4390fSRalf Baechle static const struct intr_group intr_group[NUM_INTR_GROUPS] = { 6373b4390fSRalf Baechle { 6473b4390fSRalf Baechle .mask = 0x0000efff, 6573b4390fSRalf Baechle .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 0 * IC_GROUP_OFFSET)}, 6673b4390fSRalf Baechle { 6773b4390fSRalf Baechle .mask = 0x00001fff, 6873b4390fSRalf Baechle .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 1 * IC_GROUP_OFFSET)}, 6973b4390fSRalf Baechle { 7073b4390fSRalf Baechle .mask = 0x00000007, 7173b4390fSRalf Baechle .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 2 * IC_GROUP_OFFSET)}, 7273b4390fSRalf Baechle { 7373b4390fSRalf Baechle .mask = 0x0003ffff, 7473b4390fSRalf Baechle .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 3 * IC_GROUP_OFFSET)}, 7573b4390fSRalf Baechle { 7673b4390fSRalf Baechle .mask = 0xffffffff, 7773b4390fSRalf Baechle .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 4 * IC_GROUP_OFFSET)} 7873b4390fSRalf Baechle }; 7973b4390fSRalf Baechle 8073b4390fSRalf Baechle #define READ_PEND(base) (*(base)) 8173b4390fSRalf Baechle #define READ_MASK(base) (*(base + 2)) 8273b4390fSRalf Baechle #define WRITE_MASK(base, val) (*(base + 2) = (val)) 8373b4390fSRalf Baechle 8473b4390fSRalf Baechle static inline int irq_to_group(unsigned int irq_nr) 8573b4390fSRalf Baechle { 8673b4390fSRalf Baechle return (irq_nr - GROUP0_IRQ_BASE) >> 5; 8773b4390fSRalf Baechle } 8873b4390fSRalf Baechle 8973b4390fSRalf Baechle static inline int group_to_ip(unsigned int group) 9073b4390fSRalf Baechle { 9173b4390fSRalf Baechle return group + 2; 9273b4390fSRalf Baechle } 9373b4390fSRalf Baechle 9473b4390fSRalf Baechle static inline void enable_local_irq(unsigned int ip) 9573b4390fSRalf Baechle { 9673b4390fSRalf Baechle int ipnum = 0x100 << ip; 9773b4390fSRalf Baechle 9873b4390fSRalf Baechle set_c0_status(ipnum); 9973b4390fSRalf Baechle } 10073b4390fSRalf Baechle 10173b4390fSRalf Baechle static inline void disable_local_irq(unsigned int ip) 10273b4390fSRalf Baechle { 10373b4390fSRalf Baechle int ipnum = 0x100 << ip; 10473b4390fSRalf Baechle 10573b4390fSRalf Baechle clear_c0_status(ipnum); 10673b4390fSRalf Baechle } 10773b4390fSRalf Baechle 10873b4390fSRalf Baechle static inline void ack_local_irq(unsigned int ip) 10973b4390fSRalf Baechle { 11073b4390fSRalf Baechle int ipnum = 0x100 << ip; 11173b4390fSRalf Baechle 11273b4390fSRalf Baechle clear_c0_cause(ipnum); 11373b4390fSRalf Baechle } 11473b4390fSRalf Baechle 11573b4390fSRalf Baechle static void rb532_enable_irq(unsigned int irq_nr) 11673b4390fSRalf Baechle { 11773b4390fSRalf Baechle int ip = irq_nr - GROUP0_IRQ_BASE; 11873b4390fSRalf Baechle unsigned int group, intr_bit; 11973b4390fSRalf Baechle volatile unsigned int *addr; 12073b4390fSRalf Baechle 12173b4390fSRalf Baechle if (ip < 0) 12273b4390fSRalf Baechle enable_local_irq(irq_nr); 12373b4390fSRalf Baechle else { 12473b4390fSRalf Baechle group = ip >> 5; 12573b4390fSRalf Baechle 12673b4390fSRalf Baechle ip &= (1 << 5) - 1; 12773b4390fSRalf Baechle intr_bit = 1 << ip; 12873b4390fSRalf Baechle 12973b4390fSRalf Baechle enable_local_irq(group_to_ip(group)); 13073b4390fSRalf Baechle 13173b4390fSRalf Baechle addr = intr_group[group].base_addr; 13273b4390fSRalf Baechle WRITE_MASK(addr, READ_MASK(addr) & ~intr_bit); 13373b4390fSRalf Baechle } 13473b4390fSRalf Baechle } 13573b4390fSRalf Baechle 13673b4390fSRalf Baechle static void rb532_disable_irq(unsigned int irq_nr) 13773b4390fSRalf Baechle { 13873b4390fSRalf Baechle int ip = irq_nr - GROUP0_IRQ_BASE; 13973b4390fSRalf Baechle unsigned int group, intr_bit, mask; 14073b4390fSRalf Baechle volatile unsigned int *addr; 14173b4390fSRalf Baechle 14273b4390fSRalf Baechle if (ip < 0) { 14373b4390fSRalf Baechle disable_local_irq(irq_nr); 14473b4390fSRalf Baechle } else { 14573b4390fSRalf Baechle group = ip >> 5; 14673b4390fSRalf Baechle 14773b4390fSRalf Baechle ip &= (1 << 5) - 1; 14873b4390fSRalf Baechle intr_bit = 1 << ip; 14973b4390fSRalf Baechle addr = intr_group[group].base_addr; 15073b4390fSRalf Baechle mask = READ_MASK(addr); 15173b4390fSRalf Baechle mask |= intr_bit; 15273b4390fSRalf Baechle WRITE_MASK(addr, mask); 15373b4390fSRalf Baechle 154*d36773e5SFlorian Fainelli /* There is a maximum of 14 GPIO interrupts */ 155*d36773e5SFlorian Fainelli if (group == GPIO_MAPPED_IRQ_GROUP && irq_nr <= (GROUP4_IRQ_BASE + 13)) 1564aa0f4d7SPhil Sutter rb532_gpio_set_istat(0, irq_nr - GPIO_MAPPED_IRQ_BASE); 1574aa0f4d7SPhil Sutter 15873b4390fSRalf Baechle /* 15973b4390fSRalf Baechle * if there are no more interrupts enabled in this 16073b4390fSRalf Baechle * group, disable corresponding IP 16173b4390fSRalf Baechle */ 16273b4390fSRalf Baechle if (mask == intr_group[group].mask) 16373b4390fSRalf Baechle disable_local_irq(group_to_ip(group)); 16473b4390fSRalf Baechle } 16573b4390fSRalf Baechle } 16673b4390fSRalf Baechle 16773b4390fSRalf Baechle static void rb532_mask_and_ack_irq(unsigned int irq_nr) 16873b4390fSRalf Baechle { 16973b4390fSRalf Baechle rb532_disable_irq(irq_nr); 17073b4390fSRalf Baechle ack_local_irq(group_to_ip(irq_to_group(irq_nr))); 17173b4390fSRalf Baechle } 17273b4390fSRalf Baechle 1734aa0f4d7SPhil Sutter static int rb532_set_type(unsigned int irq_nr, unsigned type) 1744aa0f4d7SPhil Sutter { 1754aa0f4d7SPhil Sutter int gpio = irq_nr - GPIO_MAPPED_IRQ_BASE; 1764aa0f4d7SPhil Sutter int group = irq_to_group(irq_nr); 1774aa0f4d7SPhil Sutter 178*d36773e5SFlorian Fainelli if (group != GPIO_MAPPED_IRQ_GROUP || irq_nr > (GROUP4_IRQ_BASE + 13)) 1794aa0f4d7SPhil Sutter return (type == IRQ_TYPE_LEVEL_HIGH) ? 0 : -EINVAL; 1804aa0f4d7SPhil Sutter 1814aa0f4d7SPhil Sutter switch (type) { 1824aa0f4d7SPhil Sutter case IRQ_TYPE_LEVEL_HIGH: 1834aa0f4d7SPhil Sutter rb532_gpio_set_ilevel(1, gpio); 1844aa0f4d7SPhil Sutter break; 1854aa0f4d7SPhil Sutter case IRQ_TYPE_LEVEL_LOW: 1864aa0f4d7SPhil Sutter rb532_gpio_set_ilevel(0, gpio); 1874aa0f4d7SPhil Sutter break; 1884aa0f4d7SPhil Sutter default: 1894aa0f4d7SPhil Sutter return -EINVAL; 1904aa0f4d7SPhil Sutter } 1914aa0f4d7SPhil Sutter 1924aa0f4d7SPhil Sutter return 0; 1934aa0f4d7SPhil Sutter } 1944aa0f4d7SPhil Sutter 19573b4390fSRalf Baechle static struct irq_chip rc32434_irq_type = { 19673b4390fSRalf Baechle .name = "RB532", 19773b4390fSRalf Baechle .ack = rb532_disable_irq, 19873b4390fSRalf Baechle .mask = rb532_disable_irq, 19973b4390fSRalf Baechle .mask_ack = rb532_mask_and_ack_irq, 20073b4390fSRalf Baechle .unmask = rb532_enable_irq, 2014aa0f4d7SPhil Sutter .set_type = rb532_set_type, 20273b4390fSRalf Baechle }; 20373b4390fSRalf Baechle 20473b4390fSRalf Baechle void __init arch_init_irq(void) 20573b4390fSRalf Baechle { 20673b4390fSRalf Baechle int i; 20773b4390fSRalf Baechle 20873b4390fSRalf Baechle pr_info("Initializing IRQ's: %d out of %d\n", RC32434_NR_IRQS, NR_IRQS); 20973b4390fSRalf Baechle 21073b4390fSRalf Baechle for (i = 0; i < RC32434_NR_IRQS; i++) 21173b4390fSRalf Baechle set_irq_chip_and_handler(i, &rc32434_irq_type, 21273b4390fSRalf Baechle handle_level_irq); 21373b4390fSRalf Baechle } 21473b4390fSRalf Baechle 21573b4390fSRalf Baechle /* Main Interrupt dispatcher */ 21673b4390fSRalf Baechle asmlinkage void plat_irq_dispatch(void) 21773b4390fSRalf Baechle { 21873b4390fSRalf Baechle unsigned int ip, pend, group; 21973b4390fSRalf Baechle volatile unsigned int *addr; 22073b4390fSRalf Baechle unsigned int cp0_cause = read_c0_cause() & read_c0_status(); 22173b4390fSRalf Baechle 22273b4390fSRalf Baechle if (cp0_cause & CAUSEF_IP7) { 22373b4390fSRalf Baechle do_IRQ(7); 22473b4390fSRalf Baechle } else { 22573b4390fSRalf Baechle ip = (cp0_cause & 0x7c00); 22673b4390fSRalf Baechle if (ip) { 22773b4390fSRalf Baechle group = 21 + (fls(ip) - 32); 22873b4390fSRalf Baechle 22973b4390fSRalf Baechle addr = intr_group[group].base_addr; 23073b4390fSRalf Baechle 23173b4390fSRalf Baechle pend = READ_PEND(addr); 23273b4390fSRalf Baechle pend &= ~READ_MASK(addr); /* only unmasked interrupts */ 23373b4390fSRalf Baechle pend = 39 + (fls(pend) - 32); 23473b4390fSRalf Baechle do_IRQ((group << 5) + pend); 23573b4390fSRalf Baechle } 23673b4390fSRalf Baechle } 23773b4390fSRalf Baechle } 238