1 /* 2 * This program is free software; you can redistribute it and/or modify it 3 * under the terms of the GNU General Public License as published by the 4 * Free Software Foundation; either version 2 of the License, or (at your 5 * option) any later version. 6 * 7 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED 8 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 9 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN 10 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 11 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 12 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 13 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON 14 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 15 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 16 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 17 * 18 * You should have received a copy of the GNU General Public License along 19 * with this program; if not, write to the Free Software Foundation, Inc., 20 * 675 Mass Ave, Cambridge, MA 02139, USA. 21 * 22 * Copyright 2002 MontaVista Software Inc. 23 * Author: MontaVista Software, Inc. 24 * stevel@mvista.com or source@mvista.com 25 */ 26 27 #include <linux/bitops.h> 28 #include <linux/errno.h> 29 #include <linux/init.h> 30 #include <linux/io.h> 31 #include <linux/kernel_stat.h> 32 #include <linux/module.h> 33 #include <linux/signal.h> 34 #include <linux/sched.h> 35 #include <linux/types.h> 36 #include <linux/interrupt.h> 37 #include <linux/ioport.h> 38 #include <linux/timex.h> 39 #include <linux/random.h> 40 #include <linux/delay.h> 41 42 #include <asm/bootinfo.h> 43 #include <asm/time.h> 44 #include <asm/mipsregs.h> 45 #include <asm/system.h> 46 47 #include <asm/mach-rc32434/irq.h> 48 #include <asm/mach-rc32434/gpio.h> 49 50 struct intr_group { 51 u32 mask; /* mask of valid bits in pending/mask registers */ 52 volatile u32 *base_addr; 53 }; 54 55 #define RC32434_NR_IRQS (GROUP4_IRQ_BASE + 32) 56 57 #if (NR_IRQS < RC32434_NR_IRQS) 58 #error Too little irqs defined. Did you override <asm/irq.h> ? 59 #endif 60 61 static const struct intr_group intr_group[NUM_INTR_GROUPS] = { 62 { 63 .mask = 0x0000efff, 64 .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 0 * IC_GROUP_OFFSET)}, 65 { 66 .mask = 0x00001fff, 67 .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 1 * IC_GROUP_OFFSET)}, 68 { 69 .mask = 0x00000007, 70 .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 2 * IC_GROUP_OFFSET)}, 71 { 72 .mask = 0x0003ffff, 73 .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 3 * IC_GROUP_OFFSET)}, 74 { 75 .mask = 0xffffffff, 76 .base_addr = (u32 *) KSEG1ADDR(IC_GROUP0_PEND + 4 * IC_GROUP_OFFSET)} 77 }; 78 79 #define READ_PEND(base) (*(base)) 80 #define READ_MASK(base) (*(base + 2)) 81 #define WRITE_MASK(base, val) (*(base + 2) = (val)) 82 83 static inline int irq_to_group(unsigned int irq_nr) 84 { 85 return (irq_nr - GROUP0_IRQ_BASE) >> 5; 86 } 87 88 static inline int group_to_ip(unsigned int group) 89 { 90 return group + 2; 91 } 92 93 static inline void enable_local_irq(unsigned int ip) 94 { 95 int ipnum = 0x100 << ip; 96 97 set_c0_status(ipnum); 98 } 99 100 static inline void disable_local_irq(unsigned int ip) 101 { 102 int ipnum = 0x100 << ip; 103 104 clear_c0_status(ipnum); 105 } 106 107 static inline void ack_local_irq(unsigned int ip) 108 { 109 int ipnum = 0x100 << ip; 110 111 clear_c0_cause(ipnum); 112 } 113 114 static void rb532_enable_irq(struct irq_data *d) 115 { 116 unsigned int group, intr_bit, irq_nr = d->irq; 117 int ip = irq_nr - GROUP0_IRQ_BASE; 118 volatile unsigned int *addr; 119 120 if (ip < 0) 121 enable_local_irq(irq_nr); 122 else { 123 group = ip >> 5; 124 125 ip &= (1 << 5) - 1; 126 intr_bit = 1 << ip; 127 128 enable_local_irq(group_to_ip(group)); 129 130 addr = intr_group[group].base_addr; 131 WRITE_MASK(addr, READ_MASK(addr) & ~intr_bit); 132 } 133 } 134 135 static void rb532_disable_irq(struct irq_data *d) 136 { 137 unsigned int group, intr_bit, mask, irq_nr = d->irq; 138 int ip = irq_nr - GROUP0_IRQ_BASE; 139 volatile unsigned int *addr; 140 141 if (ip < 0) { 142 disable_local_irq(irq_nr); 143 } else { 144 group = ip >> 5; 145 146 ip &= (1 << 5) - 1; 147 intr_bit = 1 << ip; 148 addr = intr_group[group].base_addr; 149 mask = READ_MASK(addr); 150 mask |= intr_bit; 151 WRITE_MASK(addr, mask); 152 153 /* There is a maximum of 14 GPIO interrupts */ 154 if (group == GPIO_MAPPED_IRQ_GROUP && irq_nr <= (GROUP4_IRQ_BASE + 13)) 155 rb532_gpio_set_istat(0, irq_nr - GPIO_MAPPED_IRQ_BASE); 156 157 /* 158 * if there are no more interrupts enabled in this 159 * group, disable corresponding IP 160 */ 161 if (mask == intr_group[group].mask) 162 disable_local_irq(group_to_ip(group)); 163 } 164 } 165 166 static void rb532_mask_and_ack_irq(struct irq_data *d) 167 { 168 rb532_disable_irq(d); 169 ack_local_irq(group_to_ip(irq_to_group(d->irq))); 170 } 171 172 static int rb532_set_type(struct irq_data *d, unsigned type) 173 { 174 int gpio = d->irq - GPIO_MAPPED_IRQ_BASE; 175 int group = irq_to_group(d->irq); 176 177 if (group != GPIO_MAPPED_IRQ_GROUP || d->irq > (GROUP4_IRQ_BASE + 13)) 178 return (type == IRQ_TYPE_LEVEL_HIGH) ? 0 : -EINVAL; 179 180 switch (type) { 181 case IRQ_TYPE_LEVEL_HIGH: 182 rb532_gpio_set_ilevel(1, gpio); 183 break; 184 case IRQ_TYPE_LEVEL_LOW: 185 rb532_gpio_set_ilevel(0, gpio); 186 break; 187 default: 188 return -EINVAL; 189 } 190 191 return 0; 192 } 193 194 static struct irq_chip rc32434_irq_type = { 195 .name = "RB532", 196 .irq_ack = rb532_disable_irq, 197 .irq_mask = rb532_disable_irq, 198 .irq_mask_ack = rb532_mask_and_ack_irq, 199 .irq_unmask = rb532_enable_irq, 200 .irq_set_type = rb532_set_type, 201 }; 202 203 void __init arch_init_irq(void) 204 { 205 int i; 206 207 pr_info("Initializing IRQ's: %d out of %d\n", RC32434_NR_IRQS, NR_IRQS); 208 209 for (i = 0; i < RC32434_NR_IRQS; i++) 210 irq_set_chip_and_handler(i, &rc32434_irq_type, 211 handle_level_irq); 212 } 213 214 /* Main Interrupt dispatcher */ 215 asmlinkage void plat_irq_dispatch(void) 216 { 217 unsigned int ip, pend, group; 218 volatile unsigned int *addr; 219 unsigned int cp0_cause = read_c0_cause() & read_c0_status(); 220 221 if (cp0_cause & CAUSEF_IP7) { 222 do_IRQ(7); 223 } else { 224 ip = (cp0_cause & 0x7c00); 225 if (ip) { 226 group = 21 + (fls(ip) - 32); 227 228 addr = intr_group[group].base_addr; 229 230 pend = READ_PEND(addr); 231 pend &= ~READ_MASK(addr); /* only unmasked interrupts */ 232 pend = 39 + (fls(pend) - 32); 233 do_IRQ((group << 5) + pend); 234 } 235 } 236 } 237