1*73b4390fSRalf Baechle /* 2*73b4390fSRalf Baechle * This program is free software; you can redistribute it and/or modify it 3*73b4390fSRalf Baechle * under the terms of the GNU General Public License as published by the 4*73b4390fSRalf Baechle * Free Software Foundation; either version 2 of the License, or (at your 5*73b4390fSRalf Baechle * option) any later version. 6*73b4390fSRalf Baechle * 7*73b4390fSRalf Baechle * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 8*73b4390fSRalf Baechle * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 9*73b4390fSRalf Baechle * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 10*73b4390fSRalf Baechle * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 11*73b4390fSRalf Baechle * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 12*73b4390fSRalf Baechle * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 13*73b4390fSRalf Baechle * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 14*73b4390fSRalf Baechle * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 15*73b4390fSRalf Baechle * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 16*73b4390fSRalf Baechle * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 17*73b4390fSRalf Baechle * 18*73b4390fSRalf Baechle * You should have received a copy of the GNU General Public License along 19*73b4390fSRalf Baechle * with this program; if not, write to the Free Software Foundation, Inc., 20*73b4390fSRalf Baechle * 675 Mass Ave, Cambridge, MA 02139, USA. 21*73b4390fSRalf Baechle * 22*73b4390fSRalf Baechle * Copyright 2002 MontaVista Software Inc. 23*73b4390fSRalf Baechle * Author: MontaVista Software, Inc. 24*73b4390fSRalf Baechle * stevel@mvista.com or source@mvista.com 25*73b4390fSRalf Baechle */ 26*73b4390fSRalf Baechle 27*73b4390fSRalf Baechle #include <linux/bitops.h> 28*73b4390fSRalf Baechle #include <linux/errno.h> 29*73b4390fSRalf Baechle #include <linux/init.h> 30*73b4390fSRalf Baechle #include <linux/io.h> 31*73b4390fSRalf Baechle #include <linux/kernel_stat.h> 32*73b4390fSRalf Baechle #include <linux/module.h> 33*73b4390fSRalf Baechle #include <linux/signal.h> 34*73b4390fSRalf Baechle #include <linux/sched.h> 35*73b4390fSRalf Baechle #include <linux/types.h> 36*73b4390fSRalf Baechle #include <linux/interrupt.h> 37*73b4390fSRalf Baechle #include <linux/ioport.h> 38*73b4390fSRalf Baechle #include <linux/timex.h> 39*73b4390fSRalf Baechle #include <linux/slab.h> 40*73b4390fSRalf Baechle #include <linux/random.h> 41*73b4390fSRalf Baechle #include <linux/delay.h> 42*73b4390fSRalf Baechle 43*73b4390fSRalf Baechle #include <asm/bootinfo.h> 44*73b4390fSRalf Baechle #include <asm/time.h> 45*73b4390fSRalf Baechle #include <asm/mipsregs.h> 46*73b4390fSRalf Baechle #include <asm/system.h> 47*73b4390fSRalf Baechle 48*73b4390fSRalf Baechle #include <asm/mach-rc32434/rc32434.h> 49*73b4390fSRalf Baechle 50*73b4390fSRalf Baechle struct intr_group { 51*73b4390fSRalf Baechle u32 mask; /* mask of valid bits in pending/mask registers */ 52*73b4390fSRalf Baechle volatile u32 *base_addr; 53*73b4390fSRalf Baechle }; 54*73b4390fSRalf Baechle 55*73b4390fSRalf Baechle #define RC32434_NR_IRQS (GROUP4_IRQ_BASE + 32) 56*73b4390fSRalf Baechle 57*73b4390fSRalf Baechle #if (NR_IRQS < RC32434_NR_IRQS) 58*73b4390fSRalf Baechle #error Too little irqs defined. Did you override <asm/irq.h> ? 59*73b4390fSRalf Baechle #endif 60*73b4390fSRalf Baechle 61*73b4390fSRalf Baechle static const struct intr_group intr_group[NUM_INTR_GROUPS] = { 62*73b4390fSRalf Baechle { 63*73b4390fSRalf Baechle .mask = 0x0000efff, 64*73b4390fSRalf Baechle .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 0 * IC_GROUP_OFFSET)}, 65*73b4390fSRalf Baechle { 66*73b4390fSRalf Baechle .mask = 0x00001fff, 67*73b4390fSRalf Baechle .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 1 * IC_GROUP_OFFSET)}, 68*73b4390fSRalf Baechle { 69*73b4390fSRalf Baechle .mask = 0x00000007, 70*73b4390fSRalf Baechle .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 2 * IC_GROUP_OFFSET)}, 71*73b4390fSRalf Baechle { 72*73b4390fSRalf Baechle .mask = 0x0003ffff, 73*73b4390fSRalf Baechle .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 3 * IC_GROUP_OFFSET)}, 74*73b4390fSRalf Baechle { 75*73b4390fSRalf Baechle .mask = 0xffffffff, 76*73b4390fSRalf Baechle .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 4 * IC_GROUP_OFFSET)} 77*73b4390fSRalf Baechle }; 78*73b4390fSRalf Baechle 79*73b4390fSRalf Baechle #define READ_PEND(base) (*(base)) 80*73b4390fSRalf Baechle #define READ_MASK(base) (*(base + 2)) 81*73b4390fSRalf Baechle #define WRITE_MASK(base, val) (*(base + 2) = (val)) 82*73b4390fSRalf Baechle 83*73b4390fSRalf Baechle static inline int irq_to_group(unsigned int irq_nr) 84*73b4390fSRalf Baechle { 85*73b4390fSRalf Baechle return (irq_nr - GROUP0_IRQ_BASE) >> 5; 86*73b4390fSRalf Baechle } 87*73b4390fSRalf Baechle 88*73b4390fSRalf Baechle static inline int group_to_ip(unsigned int group) 89*73b4390fSRalf Baechle { 90*73b4390fSRalf Baechle return group + 2; 91*73b4390fSRalf Baechle } 92*73b4390fSRalf Baechle 93*73b4390fSRalf Baechle static inline void enable_local_irq(unsigned int ip) 94*73b4390fSRalf Baechle { 95*73b4390fSRalf Baechle int ipnum = 0x100 << ip; 96*73b4390fSRalf Baechle 97*73b4390fSRalf Baechle set_c0_status(ipnum); 98*73b4390fSRalf Baechle } 99*73b4390fSRalf Baechle 100*73b4390fSRalf Baechle static inline void disable_local_irq(unsigned int ip) 101*73b4390fSRalf Baechle { 102*73b4390fSRalf Baechle int ipnum = 0x100 << ip; 103*73b4390fSRalf Baechle 104*73b4390fSRalf Baechle clear_c0_status(ipnum); 105*73b4390fSRalf Baechle } 106*73b4390fSRalf Baechle 107*73b4390fSRalf Baechle static inline void ack_local_irq(unsigned int ip) 108*73b4390fSRalf Baechle { 109*73b4390fSRalf Baechle int ipnum = 0x100 << ip; 110*73b4390fSRalf Baechle 111*73b4390fSRalf Baechle clear_c0_cause(ipnum); 112*73b4390fSRalf Baechle } 113*73b4390fSRalf Baechle 114*73b4390fSRalf Baechle static void rb532_enable_irq(unsigned int irq_nr) 115*73b4390fSRalf Baechle { 116*73b4390fSRalf Baechle int ip = irq_nr - GROUP0_IRQ_BASE; 117*73b4390fSRalf Baechle unsigned int group, intr_bit; 118*73b4390fSRalf Baechle volatile unsigned int *addr; 119*73b4390fSRalf Baechle 120*73b4390fSRalf Baechle if (ip < 0) 121*73b4390fSRalf Baechle enable_local_irq(irq_nr); 122*73b4390fSRalf Baechle else { 123*73b4390fSRalf Baechle group = ip >> 5; 124*73b4390fSRalf Baechle 125*73b4390fSRalf Baechle ip &= (1 << 5) - 1; 126*73b4390fSRalf Baechle intr_bit = 1 << ip; 127*73b4390fSRalf Baechle 128*73b4390fSRalf Baechle enable_local_irq(group_to_ip(group)); 129*73b4390fSRalf Baechle 130*73b4390fSRalf Baechle addr = intr_group[group].base_addr; 131*73b4390fSRalf Baechle WRITE_MASK(addr, READ_MASK(addr) & ~intr_bit); 132*73b4390fSRalf Baechle } 133*73b4390fSRalf Baechle } 134*73b4390fSRalf Baechle 135*73b4390fSRalf Baechle static void rb532_disable_irq(unsigned int irq_nr) 136*73b4390fSRalf Baechle { 137*73b4390fSRalf Baechle int ip = irq_nr - GROUP0_IRQ_BASE; 138*73b4390fSRalf Baechle unsigned int group, intr_bit, mask; 139*73b4390fSRalf Baechle volatile unsigned int *addr; 140*73b4390fSRalf Baechle 141*73b4390fSRalf Baechle if (ip < 0) { 142*73b4390fSRalf Baechle disable_local_irq(irq_nr); 143*73b4390fSRalf Baechle } else { 144*73b4390fSRalf Baechle group = ip >> 5; 145*73b4390fSRalf Baechle 146*73b4390fSRalf Baechle ip &= (1 << 5) - 1; 147*73b4390fSRalf Baechle intr_bit = 1 << ip; 148*73b4390fSRalf Baechle addr = intr_group[group].base_addr; 149*73b4390fSRalf Baechle mask = READ_MASK(addr); 150*73b4390fSRalf Baechle mask |= intr_bit; 151*73b4390fSRalf Baechle WRITE_MASK(addr, mask); 152*73b4390fSRalf Baechle 153*73b4390fSRalf Baechle /* 154*73b4390fSRalf Baechle * if there are no more interrupts enabled in this 155*73b4390fSRalf Baechle * group, disable corresponding IP 156*73b4390fSRalf Baechle */ 157*73b4390fSRalf Baechle if (mask == intr_group[group].mask) 158*73b4390fSRalf Baechle disable_local_irq(group_to_ip(group)); 159*73b4390fSRalf Baechle } 160*73b4390fSRalf Baechle } 161*73b4390fSRalf Baechle 162*73b4390fSRalf Baechle static void rb532_mask_and_ack_irq(unsigned int irq_nr) 163*73b4390fSRalf Baechle { 164*73b4390fSRalf Baechle rb532_disable_irq(irq_nr); 165*73b4390fSRalf Baechle ack_local_irq(group_to_ip(irq_to_group(irq_nr))); 166*73b4390fSRalf Baechle } 167*73b4390fSRalf Baechle 168*73b4390fSRalf Baechle static struct irq_chip rc32434_irq_type = { 169*73b4390fSRalf Baechle .name = "RB532", 170*73b4390fSRalf Baechle .ack = rb532_disable_irq, 171*73b4390fSRalf Baechle .mask = rb532_disable_irq, 172*73b4390fSRalf Baechle .mask_ack = rb532_mask_and_ack_irq, 173*73b4390fSRalf Baechle .unmask = rb532_enable_irq, 174*73b4390fSRalf Baechle }; 175*73b4390fSRalf Baechle 176*73b4390fSRalf Baechle void __init arch_init_irq(void) 177*73b4390fSRalf Baechle { 178*73b4390fSRalf Baechle int i; 179*73b4390fSRalf Baechle 180*73b4390fSRalf Baechle pr_info("Initializing IRQ's: %d out of %d\n", RC32434_NR_IRQS, NR_IRQS); 181*73b4390fSRalf Baechle 182*73b4390fSRalf Baechle for (i = 0; i < RC32434_NR_IRQS; i++) 183*73b4390fSRalf Baechle set_irq_chip_and_handler(i, &rc32434_irq_type, 184*73b4390fSRalf Baechle handle_level_irq); 185*73b4390fSRalf Baechle } 186*73b4390fSRalf Baechle 187*73b4390fSRalf Baechle /* Main Interrupt dispatcher */ 188*73b4390fSRalf Baechle asmlinkage void plat_irq_dispatch(void) 189*73b4390fSRalf Baechle { 190*73b4390fSRalf Baechle unsigned int ip, pend, group; 191*73b4390fSRalf Baechle volatile unsigned int *addr; 192*73b4390fSRalf Baechle unsigned int cp0_cause = read_c0_cause() & read_c0_status(); 193*73b4390fSRalf Baechle 194*73b4390fSRalf Baechle if (cp0_cause & CAUSEF_IP7) { 195*73b4390fSRalf Baechle do_IRQ(7); 196*73b4390fSRalf Baechle } else { 197*73b4390fSRalf Baechle ip = (cp0_cause & 0x7c00); 198*73b4390fSRalf Baechle if (ip) { 199*73b4390fSRalf Baechle group = 21 + (fls(ip) - 32); 200*73b4390fSRalf Baechle 201*73b4390fSRalf Baechle addr = intr_group[group].base_addr; 202*73b4390fSRalf Baechle 203*73b4390fSRalf Baechle pend = READ_PEND(addr); 204*73b4390fSRalf Baechle pend &= ~READ_MASK(addr); /* only unmasked interrupts */ 205*73b4390fSRalf Baechle pend = 39 + (fls(pend) - 32); 206*73b4390fSRalf Baechle do_IRQ((group << 5) + pend); 207*73b4390fSRalf Baechle } 208*73b4390fSRalf Baechle } 209*73b4390fSRalf Baechle } 210