1 /* 2 * Intel XScale PXA Programmable Interrupt Controller. 3 * 4 * Copyright (c) 2006 Openedhand Ltd. 5 * Copyright (c) 2006 Thorsten Zitterell 6 * Written by Andrzej Zaborowski <balrog@zabor.org> 7 * 8 * This code is licensed under the GPL. 9 */ 10 11 #include "qemu/osdep.h" 12 #include "qemu-common.h" 13 #include "cpu.h" 14 #include "hw/hw.h" 15 #include "hw/arm/pxa.h" 16 #include "hw/sysbus.h" 17 18 #define ICIP 0x00 /* Interrupt Controller IRQ Pending register */ 19 #define ICMR 0x04 /* Interrupt Controller Mask register */ 20 #define ICLR 0x08 /* Interrupt Controller Level register */ 21 #define ICFP 0x0c /* Interrupt Controller FIQ Pending register */ 22 #define ICPR 0x10 /* Interrupt Controller Pending register */ 23 #define ICCR 0x14 /* Interrupt Controller Control register */ 24 #define ICHP 0x18 /* Interrupt Controller Highest Priority register */ 25 #define IPR0 0x1c /* Interrupt Controller Priority register 0 */ 26 #define IPR31 0x98 /* Interrupt Controller Priority register 31 */ 27 #define ICIP2 0x9c /* Interrupt Controller IRQ Pending register 2 */ 28 #define ICMR2 0xa0 /* Interrupt Controller Mask register 2 */ 29 #define ICLR2 0xa4 /* Interrupt Controller Level register 2 */ 30 #define ICFP2 0xa8 /* Interrupt Controller FIQ Pending register 2 */ 31 #define ICPR2 0xac /* Interrupt Controller Pending register 2 */ 32 #define IPR32 0xb0 /* Interrupt Controller Priority register 32 */ 33 #define IPR39 0xcc /* Interrupt Controller Priority register 39 */ 34 35 #define PXA2XX_PIC_SRCS 40 36 37 #define TYPE_PXA2XX_PIC "pxa2xx_pic" 38 #define PXA2XX_PIC(obj) \ 39 OBJECT_CHECK(PXA2xxPICState, (obj), TYPE_PXA2XX_PIC) 40 41 typedef struct { 42 /*< private >*/ 43 SysBusDevice parent_obj; 44 /*< public >*/ 45 46 MemoryRegion iomem; 47 ARMCPU *cpu; 48 uint32_t int_enabled[2]; 49 uint32_t int_pending[2]; 50 uint32_t is_fiq[2]; 51 uint32_t int_idle; 52 uint32_t priority[PXA2XX_PIC_SRCS]; 53 } PXA2xxPICState; 54 55 static void pxa2xx_pic_update(void *opaque) 56 { 57 uint32_t mask[2]; 58 PXA2xxPICState *s = (PXA2xxPICState *) opaque; 59 CPUState *cpu = CPU(s->cpu); 60 61 if (cpu->halted) { 62 mask[0] = s->int_pending[0] & (s->int_enabled[0] | s->int_idle); 63 mask[1] = s->int_pending[1] & (s->int_enabled[1] | s->int_idle); 64 if (mask[0] || mask[1]) { 65 cpu_interrupt(cpu, CPU_INTERRUPT_EXITTB); 66 } 67 } 68 69 mask[0] = s->int_pending[0] & s->int_enabled[0]; 70 mask[1] = s->int_pending[1] & s->int_enabled[1]; 71 72 if ((mask[0] & s->is_fiq[0]) || (mask[1] & s->is_fiq[1])) { 73 cpu_interrupt(cpu, CPU_INTERRUPT_FIQ); 74 } else { 75 cpu_reset_interrupt(cpu, CPU_INTERRUPT_FIQ); 76 } 77 78 if ((mask[0] & ~s->is_fiq[0]) || (mask[1] & ~s->is_fiq[1])) { 79 cpu_interrupt(cpu, CPU_INTERRUPT_HARD); 80 } else { 81 cpu_reset_interrupt(cpu, CPU_INTERRUPT_HARD); 82 } 83 } 84 85 /* Note: Here level means state of the signal on a pin, not 86 * IRQ/FIQ distinction as in PXA Developer Manual. */ 87 static void pxa2xx_pic_set_irq(void *opaque, int irq, int level) 88 { 89 PXA2xxPICState *s = (PXA2xxPICState *) opaque; 90 int int_set = (irq >= 32); 91 irq &= 31; 92 93 if (level) 94 s->int_pending[int_set] |= 1 << irq; 95 else 96 s->int_pending[int_set] &= ~(1 << irq); 97 98 pxa2xx_pic_update(opaque); 99 } 100 101 static inline uint32_t pxa2xx_pic_highest(PXA2xxPICState *s) { 102 int i, int_set, irq; 103 uint32_t bit, mask[2]; 104 uint32_t ichp = 0x003f003f; /* Both IDs invalid */ 105 106 mask[0] = s->int_pending[0] & s->int_enabled[0]; 107 mask[1] = s->int_pending[1] & s->int_enabled[1]; 108 109 for (i = PXA2XX_PIC_SRCS - 1; i >= 0; i --) { 110 irq = s->priority[i] & 0x3f; 111 if ((s->priority[i] & (1U << 31)) && irq < PXA2XX_PIC_SRCS) { 112 /* Source peripheral ID is valid. */ 113 bit = 1 << (irq & 31); 114 int_set = (irq >= 32); 115 116 if (mask[int_set] & bit & s->is_fiq[int_set]) { 117 /* FIQ asserted */ 118 ichp &= 0xffff0000; 119 ichp |= (1 << 15) | irq; 120 } 121 122 if (mask[int_set] & bit & ~s->is_fiq[int_set]) { 123 /* IRQ asserted */ 124 ichp &= 0x0000ffff; 125 ichp |= (1U << 31) | (irq << 16); 126 } 127 } 128 } 129 130 return ichp; 131 } 132 133 static uint64_t pxa2xx_pic_mem_read(void *opaque, hwaddr offset, 134 unsigned size) 135 { 136 PXA2xxPICState *s = (PXA2xxPICState *) opaque; 137 138 switch (offset) { 139 case ICIP: /* IRQ Pending register */ 140 return s->int_pending[0] & ~s->is_fiq[0] & s->int_enabled[0]; 141 case ICIP2: /* IRQ Pending register 2 */ 142 return s->int_pending[1] & ~s->is_fiq[1] & s->int_enabled[1]; 143 case ICMR: /* Mask register */ 144 return s->int_enabled[0]; 145 case ICMR2: /* Mask register 2 */ 146 return s->int_enabled[1]; 147 case ICLR: /* Level register */ 148 return s->is_fiq[0]; 149 case ICLR2: /* Level register 2 */ 150 return s->is_fiq[1]; 151 case ICCR: /* Idle mask */ 152 return (s->int_idle == 0); 153 case ICFP: /* FIQ Pending register */ 154 return s->int_pending[0] & s->is_fiq[0] & s->int_enabled[0]; 155 case ICFP2: /* FIQ Pending register 2 */ 156 return s->int_pending[1] & s->is_fiq[1] & s->int_enabled[1]; 157 case ICPR: /* Pending register */ 158 return s->int_pending[0]; 159 case ICPR2: /* Pending register 2 */ 160 return s->int_pending[1]; 161 case IPR0 ... IPR31: 162 return s->priority[0 + ((offset - IPR0 ) >> 2)]; 163 case IPR32 ... IPR39: 164 return s->priority[32 + ((offset - IPR32) >> 2)]; 165 case ICHP: /* Highest Priority register */ 166 return pxa2xx_pic_highest(s); 167 default: 168 printf("%s: Bad register offset " REG_FMT "\n", __FUNCTION__, offset); 169 return 0; 170 } 171 } 172 173 static void pxa2xx_pic_mem_write(void *opaque, hwaddr offset, 174 uint64_t value, unsigned size) 175 { 176 PXA2xxPICState *s = (PXA2xxPICState *) opaque; 177 178 switch (offset) { 179 case ICMR: /* Mask register */ 180 s->int_enabled[0] = value; 181 break; 182 case ICMR2: /* Mask register 2 */ 183 s->int_enabled[1] = value; 184 break; 185 case ICLR: /* Level register */ 186 s->is_fiq[0] = value; 187 break; 188 case ICLR2: /* Level register 2 */ 189 s->is_fiq[1] = value; 190 break; 191 case ICCR: /* Idle mask */ 192 s->int_idle = (value & 1) ? 0 : ~0; 193 break; 194 case IPR0 ... IPR31: 195 s->priority[0 + ((offset - IPR0 ) >> 2)] = value & 0x8000003f; 196 break; 197 case IPR32 ... IPR39: 198 s->priority[32 + ((offset - IPR32) >> 2)] = value & 0x8000003f; 199 break; 200 default: 201 printf("%s: Bad register offset " REG_FMT "\n", __FUNCTION__, offset); 202 return; 203 } 204 pxa2xx_pic_update(opaque); 205 } 206 207 /* Interrupt Controller Coprocessor Space Register Mapping */ 208 static const int pxa2xx_cp_reg_map[0x10] = { 209 [0x0 ... 0xf] = -1, 210 [0x0] = ICIP, 211 [0x1] = ICMR, 212 [0x2] = ICLR, 213 [0x3] = ICFP, 214 [0x4] = ICPR, 215 [0x5] = ICHP, 216 [0x6] = ICIP2, 217 [0x7] = ICMR2, 218 [0x8] = ICLR2, 219 [0x9] = ICFP2, 220 [0xa] = ICPR2, 221 }; 222 223 static uint64_t pxa2xx_pic_cp_read(CPUARMState *env, const ARMCPRegInfo *ri) 224 { 225 int offset = pxa2xx_cp_reg_map[ri->crn]; 226 return pxa2xx_pic_mem_read(ri->opaque, offset, 4); 227 } 228 229 static void pxa2xx_pic_cp_write(CPUARMState *env, const ARMCPRegInfo *ri, 230 uint64_t value) 231 { 232 int offset = pxa2xx_cp_reg_map[ri->crn]; 233 pxa2xx_pic_mem_write(ri->opaque, offset, value, 4); 234 } 235 236 #define REGINFO_FOR_PIC_CP(NAME, CRN) \ 237 { .name = NAME, .cp = 6, .crn = CRN, .crm = 0, .opc1 = 0, .opc2 = 0, \ 238 .access = PL1_RW, .type = ARM_CP_IO, \ 239 .readfn = pxa2xx_pic_cp_read, .writefn = pxa2xx_pic_cp_write } 240 241 static const ARMCPRegInfo pxa_pic_cp_reginfo[] = { 242 REGINFO_FOR_PIC_CP("ICIP", 0), 243 REGINFO_FOR_PIC_CP("ICMR", 1), 244 REGINFO_FOR_PIC_CP("ICLR", 2), 245 REGINFO_FOR_PIC_CP("ICFP", 3), 246 REGINFO_FOR_PIC_CP("ICPR", 4), 247 REGINFO_FOR_PIC_CP("ICHP", 5), 248 REGINFO_FOR_PIC_CP("ICIP2", 6), 249 REGINFO_FOR_PIC_CP("ICMR2", 7), 250 REGINFO_FOR_PIC_CP("ICLR2", 8), 251 REGINFO_FOR_PIC_CP("ICFP2", 9), 252 REGINFO_FOR_PIC_CP("ICPR2", 0xa), 253 REGINFO_SENTINEL 254 }; 255 256 static const MemoryRegionOps pxa2xx_pic_ops = { 257 .read = pxa2xx_pic_mem_read, 258 .write = pxa2xx_pic_mem_write, 259 .endianness = DEVICE_NATIVE_ENDIAN, 260 }; 261 262 static int pxa2xx_pic_post_load(void *opaque, int version_id) 263 { 264 pxa2xx_pic_update(opaque); 265 return 0; 266 } 267 268 DeviceState *pxa2xx_pic_init(hwaddr base, ARMCPU *cpu) 269 { 270 DeviceState *dev = qdev_create(NULL, TYPE_PXA2XX_PIC); 271 PXA2xxPICState *s = PXA2XX_PIC(dev); 272 273 s->cpu = cpu; 274 275 s->int_pending[0] = 0; 276 s->int_pending[1] = 0; 277 s->int_enabled[0] = 0; 278 s->int_enabled[1] = 0; 279 s->is_fiq[0] = 0; 280 s->is_fiq[1] = 0; 281 282 qdev_init_nofail(dev); 283 284 qdev_init_gpio_in(dev, pxa2xx_pic_set_irq, PXA2XX_PIC_SRCS); 285 286 /* Enable IC memory-mapped registers access. */ 287 memory_region_init_io(&s->iomem, OBJECT(s), &pxa2xx_pic_ops, s, 288 "pxa2xx-pic", 0x00100000); 289 sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem); 290 sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, base); 291 292 /* Enable IC coprocessor access. */ 293 define_arm_cp_regs_with_opaque(cpu, pxa_pic_cp_reginfo, s); 294 295 return dev; 296 } 297 298 static VMStateDescription vmstate_pxa2xx_pic_regs = { 299 .name = "pxa2xx_pic", 300 .version_id = 0, 301 .minimum_version_id = 0, 302 .post_load = pxa2xx_pic_post_load, 303 .fields = (VMStateField[]) { 304 VMSTATE_UINT32_ARRAY(int_enabled, PXA2xxPICState, 2), 305 VMSTATE_UINT32_ARRAY(int_pending, PXA2xxPICState, 2), 306 VMSTATE_UINT32_ARRAY(is_fiq, PXA2xxPICState, 2), 307 VMSTATE_UINT32(int_idle, PXA2xxPICState), 308 VMSTATE_UINT32_ARRAY(priority, PXA2xxPICState, PXA2XX_PIC_SRCS), 309 VMSTATE_END_OF_LIST(), 310 }, 311 }; 312 313 static void pxa2xx_pic_class_init(ObjectClass *klass, void *data) 314 { 315 DeviceClass *dc = DEVICE_CLASS(klass); 316 317 dc->desc = "PXA2xx PIC"; 318 dc->vmsd = &vmstate_pxa2xx_pic_regs; 319 } 320 321 static const TypeInfo pxa2xx_pic_info = { 322 .name = TYPE_PXA2XX_PIC, 323 .parent = TYPE_SYS_BUS_DEVICE, 324 .instance_size = sizeof(PXA2xxPICState), 325 .class_init = pxa2xx_pic_class_init, 326 }; 327 328 static void pxa2xx_pic_register_types(void) 329 { 330 type_register_static(&pxa2xx_pic_info); 331 } 332 333 type_init(pxa2xx_pic_register_types) 334