1 /* 2 * IRQ chip definitions for INTC IRQs. 3 * 4 * Copyright (C) 2007, 2008 Magnus Damm 5 * Copyright (C) 2009, 2010 Paul Mundt 6 * 7 * This file is subject to the terms and conditions of the GNU General Public 8 * License. See the file "COPYING" in the main directory of this archive 9 * for more details. 10 */ 11 #include <linux/cpumask.h> 12 #include <linux/io.h> 13 #include "internals.h" 14 15 void _intc_enable(struct irq_data *data, unsigned long handle) 16 { 17 unsigned int irq = data->irq; 18 struct intc_desc_int *d = get_intc_desc(irq); 19 unsigned long addr; 20 unsigned int cpu; 21 22 for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_E(handle)); cpu++) { 23 #ifdef CONFIG_SMP 24 if (!cpumask_test_cpu(cpu, data->affinity)) 25 continue; 26 #endif 27 addr = INTC_REG(d, _INTC_ADDR_E(handle), cpu); 28 intc_enable_fns[_INTC_MODE(handle)](addr, handle, intc_reg_fns\ 29 [_INTC_FN(handle)], irq); 30 } 31 32 intc_balancing_enable(irq); 33 } 34 35 static void intc_enable(struct irq_data *data) 36 { 37 _intc_enable(data, (unsigned long)irq_data_get_irq_chip_data(data)); 38 } 39 40 static void intc_disable(struct irq_data *data) 41 { 42 unsigned int irq = data->irq; 43 struct intc_desc_int *d = get_intc_desc(irq); 44 unsigned long handle = (unsigned long)irq_data_get_irq_chip_data(data); 45 unsigned long addr; 46 unsigned int cpu; 47 48 intc_balancing_disable(irq); 49 50 for (cpu = 0; cpu < SMP_NR(d, _INTC_ADDR_D(handle)); cpu++) { 51 #ifdef CONFIG_SMP 52 if (!cpumask_test_cpu(cpu, data->affinity)) 53 continue; 54 #endif 55 addr = INTC_REG(d, _INTC_ADDR_D(handle), cpu); 56 intc_disable_fns[_INTC_MODE(handle)](addr, handle,intc_reg_fns\ 57 [_INTC_FN(handle)], irq); 58 } 59 } 60 61 static int intc_set_wake(struct irq_data *data, unsigned int on) 62 { 63 return 0; /* allow wakeup, but setup hardware in intc_suspend() */ 64 } 65 66 #ifdef CONFIG_SMP 67 /* 68 * This is held with the irq desc lock held, so we don't require any 69 * additional locking here at the intc desc level. The affinity mask is 70 * later tested in the enable/disable paths. 71 */ 72 static int intc_set_affinity(struct irq_data *data, 73 const struct cpumask *cpumask, 74 bool force) 75 { 76 if (!cpumask_intersects(cpumask, cpu_online_mask)) 77 return -1; 78 79 cpumask_copy(data->affinity, cpumask); 80 81 return 0; 82 } 83 #endif 84 85 static void intc_mask_ack(struct irq_data *data) 86 { 87 unsigned int irq = data->irq; 88 struct intc_desc_int *d = get_intc_desc(irq); 89 unsigned long handle = intc_get_ack_handle(irq); 90 unsigned long addr; 91 92 intc_disable(data); 93 94 /* read register and write zero only to the associated bit */ 95 if (handle) { 96 unsigned int value; 97 98 addr = INTC_REG(d, _INTC_ADDR_D(handle), 0); 99 value = intc_set_field_from_handle(0, 1, handle); 100 101 switch (_INTC_FN(handle)) { 102 case REG_FN_MODIFY_BASE + 0: /* 8bit */ 103 __raw_readb(addr); 104 __raw_writeb(0xff ^ value, addr); 105 break; 106 case REG_FN_MODIFY_BASE + 1: /* 16bit */ 107 __raw_readw(addr); 108 __raw_writew(0xffff ^ value, addr); 109 break; 110 case REG_FN_MODIFY_BASE + 3: /* 32bit */ 111 __raw_readl(addr); 112 __raw_writel(0xffffffff ^ value, addr); 113 break; 114 default: 115 BUG(); 116 break; 117 } 118 } 119 } 120 121 static struct intc_handle_int *intc_find_irq(struct intc_handle_int *hp, 122 unsigned int nr_hp, 123 unsigned int irq) 124 { 125 int i; 126 127 /* 128 * this doesn't scale well, but... 129 * 130 * this function should only be used for cerain uncommon 131 * operations such as intc_set_priority() and intc_set_type() 132 * and in those rare cases performance doesn't matter that much. 133 * keeping the memory footprint low is more important. 134 * 135 * one rather simple way to speed this up and still keep the 136 * memory footprint down is to make sure the array is sorted 137 * and then perform a bisect to lookup the irq. 138 */ 139 for (i = 0; i < nr_hp; i++) { 140 if ((hp + i)->irq != irq) 141 continue; 142 143 return hp + i; 144 } 145 146 return NULL; 147 } 148 149 int intc_set_priority(unsigned int irq, unsigned int prio) 150 { 151 struct intc_desc_int *d = get_intc_desc(irq); 152 struct irq_data *data = irq_get_irq_data(irq); 153 struct intc_handle_int *ihp; 154 155 if (!intc_get_prio_level(irq) || prio <= 1) 156 return -EINVAL; 157 158 ihp = intc_find_irq(d->prio, d->nr_prio, irq); 159 if (ihp) { 160 if (prio >= (1 << _INTC_WIDTH(ihp->handle))) 161 return -EINVAL; 162 163 intc_set_prio_level(irq, prio); 164 165 /* 166 * only set secondary masking method directly 167 * primary masking method is using intc_prio_level[irq] 168 * priority level will be set during next enable() 169 */ 170 if (_INTC_FN(ihp->handle) != REG_FN_ERR) 171 _intc_enable(data, ihp->handle); 172 } 173 return 0; 174 } 175 176 #define VALID(x) (x | 0x80) 177 178 static unsigned char intc_irq_sense_table[IRQ_TYPE_SENSE_MASK + 1] = { 179 [IRQ_TYPE_EDGE_FALLING] = VALID(0), 180 [IRQ_TYPE_EDGE_RISING] = VALID(1), 181 [IRQ_TYPE_LEVEL_LOW] = VALID(2), 182 /* SH7706, SH7707 and SH7709 do not support high level triggered */ 183 #if !defined(CONFIG_CPU_SUBTYPE_SH7706) && \ 184 !defined(CONFIG_CPU_SUBTYPE_SH7707) && \ 185 !defined(CONFIG_CPU_SUBTYPE_SH7709) 186 [IRQ_TYPE_LEVEL_HIGH] = VALID(3), 187 #endif 188 }; 189 190 static int intc_set_type(struct irq_data *data, unsigned int type) 191 { 192 unsigned int irq = data->irq; 193 struct intc_desc_int *d = get_intc_desc(irq); 194 unsigned char value = intc_irq_sense_table[type & IRQ_TYPE_SENSE_MASK]; 195 struct intc_handle_int *ihp; 196 unsigned long addr; 197 198 if (!value) 199 return -EINVAL; 200 201 ihp = intc_find_irq(d->sense, d->nr_sense, irq); 202 if (ihp) { 203 addr = INTC_REG(d, _INTC_ADDR_E(ihp->handle), 0); 204 intc_reg_fns[_INTC_FN(ihp->handle)](addr, ihp->handle, value); 205 } 206 207 return 0; 208 } 209 210 struct irq_chip intc_irq_chip = { 211 .irq_mask = intc_disable, 212 .irq_unmask = intc_enable, 213 .irq_mask_ack = intc_mask_ack, 214 .irq_enable = intc_enable, 215 .irq_disable = intc_disable, 216 .irq_shutdown = intc_disable, 217 .irq_set_type = intc_set_type, 218 .irq_set_wake = intc_set_wake, 219 #ifdef CONFIG_SMP 220 .irq_set_affinity = intc_set_affinity, 221 #endif 222 }; 223