pxa2xx_gpio.c (10671B)
1/* 2 * Intel XScale PXA255/270 GPIO controller emulation. 3 * 4 * Copyright (c) 2006 Openedhand Ltd. 5 * Written by Andrzej Zaborowski <balrog@zabor.org> 6 * 7 * This code is licensed under the GPL. 8 */ 9 10#include "qemu/osdep.h" 11#include "cpu.h" 12#include "hw/irq.h" 13#include "hw/qdev-properties.h" 14#include "hw/sysbus.h" 15#include "migration/vmstate.h" 16#include "hw/arm/pxa.h" 17#include "qapi/error.h" 18#include "qemu/log.h" 19#include "qemu/module.h" 20#include "qom/object.h" 21 22#define PXA2XX_GPIO_BANKS 4 23 24#define TYPE_PXA2XX_GPIO "pxa2xx-gpio" 25OBJECT_DECLARE_SIMPLE_TYPE(PXA2xxGPIOInfo, PXA2XX_GPIO) 26 27struct PXA2xxGPIOInfo { 28 /*< private >*/ 29 SysBusDevice parent_obj; 30 /*< public >*/ 31 32 MemoryRegion iomem; 33 qemu_irq irq0, irq1, irqX; 34 int lines; 35 int ncpu; 36 ARMCPU *cpu; 37 38 /* XXX: GNU C vectors are more suitable */ 39 uint32_t ilevel[PXA2XX_GPIO_BANKS]; 40 uint32_t olevel[PXA2XX_GPIO_BANKS]; 41 uint32_t dir[PXA2XX_GPIO_BANKS]; 42 uint32_t rising[PXA2XX_GPIO_BANKS]; 43 uint32_t falling[PXA2XX_GPIO_BANKS]; 44 uint32_t status[PXA2XX_GPIO_BANKS]; 45 uint32_t gafr[PXA2XX_GPIO_BANKS * 2]; 46 47 uint32_t prev_level[PXA2XX_GPIO_BANKS]; 48 qemu_irq handler[PXA2XX_GPIO_BANKS * 32]; 49 qemu_irq read_notify; 50}; 51 52static struct { 53 enum { 54 GPIO_NONE, 55 GPLR, 56 GPSR, 57 GPCR, 58 GPDR, 59 GRER, 60 GFER, 61 GEDR, 62 GAFR_L, 63 GAFR_U, 64 } reg; 65 int bank; 66} pxa2xx_gpio_regs[0x200] = { 67 [0 ... 0x1ff] = { GPIO_NONE, 0 }, 68#define PXA2XX_REG(reg, a0, a1, a2, a3) \ 69 [a0] = { reg, 0 }, [a1] = { reg, 1 }, [a2] = { reg, 2 }, [a3] = { reg, 3 }, 70 71 PXA2XX_REG(GPLR, 0x000, 0x004, 0x008, 0x100) 72 PXA2XX_REG(GPSR, 0x018, 0x01c, 0x020, 0x118) 73 PXA2XX_REG(GPCR, 0x024, 0x028, 0x02c, 0x124) 74 PXA2XX_REG(GPDR, 0x00c, 0x010, 0x014, 0x10c) 75 PXA2XX_REG(GRER, 0x030, 0x034, 0x038, 0x130) 76 PXA2XX_REG(GFER, 0x03c, 0x040, 0x044, 0x13c) 77 PXA2XX_REG(GEDR, 0x048, 0x04c, 0x050, 0x148) 78 PXA2XX_REG(GAFR_L, 0x054, 0x05c, 0x064, 0x06c) 79 PXA2XX_REG(GAFR_U, 0x058, 0x060, 0x068, 0x070) 80}; 81 82static void pxa2xx_gpio_irq_update(PXA2xxGPIOInfo *s) 83{ 84 if (s->status[0] & (1 << 0)) 85 qemu_irq_raise(s->irq0); 86 else 87 qemu_irq_lower(s->irq0); 88 89 if (s->status[0] & (1 << 1)) 90 qemu_irq_raise(s->irq1); 91 else 92 qemu_irq_lower(s->irq1); 93 94 if ((s->status[0] & ~3) | s->status[1] | s->status[2] | s->status[3]) 95 qemu_irq_raise(s->irqX); 96 else 97 qemu_irq_lower(s->irqX); 98} 99 100/* Bitmap of pins used as standby and sleep wake-up sources. */ 101static const int pxa2xx_gpio_wake[PXA2XX_GPIO_BANKS] = { 102 0x8003fe1b, 0x002001fc, 0xec080000, 0x0012007f, 103}; 104 105static void pxa2xx_gpio_set(void *opaque, int line, int level) 106{ 107 PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque; 108 CPUState *cpu = CPU(s->cpu); 109 int bank; 110 uint32_t mask; 111 112 if (line >= s->lines) { 113 printf("%s: No GPIO pin %i\n", __func__, line); 114 return; 115 } 116 117 bank = line >> 5; 118 mask = 1U << (line & 31); 119 120 if (level) { 121 s->status[bank] |= s->rising[bank] & mask & 122 ~s->ilevel[bank] & ~s->dir[bank]; 123 s->ilevel[bank] |= mask; 124 } else { 125 s->status[bank] |= s->falling[bank] & mask & 126 s->ilevel[bank] & ~s->dir[bank]; 127 s->ilevel[bank] &= ~mask; 128 } 129 130 if (s->status[bank] & mask) 131 pxa2xx_gpio_irq_update(s); 132 133 /* Wake-up GPIOs */ 134 if (cpu->halted && (mask & ~s->dir[bank] & pxa2xx_gpio_wake[bank])) { 135 cpu_interrupt(cpu, CPU_INTERRUPT_EXITTB); 136 } 137} 138 139static void pxa2xx_gpio_handler_update(PXA2xxGPIOInfo *s) { 140 uint32_t level, diff; 141 int i, bit, line; 142 for (i = 0; i < PXA2XX_GPIO_BANKS; i ++) { 143 level = s->olevel[i] & s->dir[i]; 144 145 for (diff = s->prev_level[i] ^ level; diff; diff ^= 1 << bit) { 146 bit = ctz32(diff); 147 line = bit + 32 * i; 148 qemu_set_irq(s->handler[line], (level >> bit) & 1); 149 } 150 151 s->prev_level[i] = level; 152 } 153} 154 155static uint64_t pxa2xx_gpio_read(void *opaque, hwaddr offset, 156 unsigned size) 157{ 158 PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque; 159 uint32_t ret; 160 int bank; 161 if (offset >= 0x200) 162 return 0; 163 164 bank = pxa2xx_gpio_regs[offset].bank; 165 switch (pxa2xx_gpio_regs[offset].reg) { 166 case GPDR: /* GPIO Pin-Direction registers */ 167 return s->dir[bank]; 168 169 case GPSR: /* GPIO Pin-Output Set registers */ 170 qemu_log_mask(LOG_GUEST_ERROR, 171 "pxa2xx GPIO: read from write only register GPSR\n"); 172 return 0; 173 174 case GPCR: /* GPIO Pin-Output Clear registers */ 175 qemu_log_mask(LOG_GUEST_ERROR, 176 "pxa2xx GPIO: read from write only register GPCR\n"); 177 return 0; 178 179 case GRER: /* GPIO Rising-Edge Detect Enable registers */ 180 return s->rising[bank]; 181 182 case GFER: /* GPIO Falling-Edge Detect Enable registers */ 183 return s->falling[bank]; 184 185 case GAFR_L: /* GPIO Alternate Function registers */ 186 return s->gafr[bank * 2]; 187 188 case GAFR_U: /* GPIO Alternate Function registers */ 189 return s->gafr[bank * 2 + 1]; 190 191 case GPLR: /* GPIO Pin-Level registers */ 192 ret = (s->olevel[bank] & s->dir[bank]) | 193 (s->ilevel[bank] & ~s->dir[bank]); 194 qemu_irq_raise(s->read_notify); 195 return ret; 196 197 case GEDR: /* GPIO Edge Detect Status registers */ 198 return s->status[bank]; 199 200 default: 201 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIX "\n", 202 __func__, offset); 203 } 204 205 return 0; 206} 207 208static void pxa2xx_gpio_write(void *opaque, hwaddr offset, 209 uint64_t value, unsigned size) 210{ 211 PXA2xxGPIOInfo *s = (PXA2xxGPIOInfo *) opaque; 212 int bank; 213 if (offset >= 0x200) 214 return; 215 216 bank = pxa2xx_gpio_regs[offset].bank; 217 switch (pxa2xx_gpio_regs[offset].reg) { 218 case GPDR: /* GPIO Pin-Direction registers */ 219 s->dir[bank] = value; 220 pxa2xx_gpio_handler_update(s); 221 break; 222 223 case GPSR: /* GPIO Pin-Output Set registers */ 224 s->olevel[bank] |= value; 225 pxa2xx_gpio_handler_update(s); 226 break; 227 228 case GPCR: /* GPIO Pin-Output Clear registers */ 229 s->olevel[bank] &= ~value; 230 pxa2xx_gpio_handler_update(s); 231 break; 232 233 case GRER: /* GPIO Rising-Edge Detect Enable registers */ 234 s->rising[bank] = value; 235 break; 236 237 case GFER: /* GPIO Falling-Edge Detect Enable registers */ 238 s->falling[bank] = value; 239 break; 240 241 case GAFR_L: /* GPIO Alternate Function registers */ 242 s->gafr[bank * 2] = value; 243 break; 244 245 case GAFR_U: /* GPIO Alternate Function registers */ 246 s->gafr[bank * 2 + 1] = value; 247 break; 248 249 case GEDR: /* GPIO Edge Detect Status registers */ 250 s->status[bank] &= ~value; 251 pxa2xx_gpio_irq_update(s); 252 break; 253 254 default: 255 qemu_log_mask(LOG_GUEST_ERROR, "%s: Bad offset 0x%" HWADDR_PRIX "\n", 256 __func__, offset); 257 } 258} 259 260static const MemoryRegionOps pxa_gpio_ops = { 261 .read = pxa2xx_gpio_read, 262 .write = pxa2xx_gpio_write, 263 .endianness = DEVICE_NATIVE_ENDIAN, 264}; 265 266DeviceState *pxa2xx_gpio_init(hwaddr base, 267 ARMCPU *cpu, DeviceState *pic, int lines) 268{ 269 CPUState *cs = CPU(cpu); 270 DeviceState *dev; 271 272 dev = qdev_new(TYPE_PXA2XX_GPIO); 273 qdev_prop_set_int32(dev, "lines", lines); 274 qdev_prop_set_int32(dev, "ncpu", cs->cpu_index); 275 sysbus_realize_and_unref(SYS_BUS_DEVICE(dev), &error_fatal); 276 277 sysbus_mmio_map(SYS_BUS_DEVICE(dev), 0, base); 278 sysbus_connect_irq(SYS_BUS_DEVICE(dev), 0, 279 qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_0)); 280 sysbus_connect_irq(SYS_BUS_DEVICE(dev), 1, 281 qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_1)); 282 sysbus_connect_irq(SYS_BUS_DEVICE(dev), 2, 283 qdev_get_gpio_in(pic, PXA2XX_PIC_GPIO_X)); 284 285 return dev; 286} 287 288static void pxa2xx_gpio_initfn(Object *obj) 289{ 290 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 291 DeviceState *dev = DEVICE(sbd); 292 PXA2xxGPIOInfo *s = PXA2XX_GPIO(dev); 293 294 memory_region_init_io(&s->iomem, obj, &pxa_gpio_ops, 295 s, "pxa2xx-gpio", 0x1000); 296 sysbus_init_mmio(sbd, &s->iomem); 297 sysbus_init_irq(sbd, &s->irq0); 298 sysbus_init_irq(sbd, &s->irq1); 299 sysbus_init_irq(sbd, &s->irqX); 300} 301 302static void pxa2xx_gpio_realize(DeviceState *dev, Error **errp) 303{ 304 PXA2xxGPIOInfo *s = PXA2XX_GPIO(dev); 305 306 s->cpu = ARM_CPU(qemu_get_cpu(s->ncpu)); 307 308 qdev_init_gpio_in(dev, pxa2xx_gpio_set, s->lines); 309 qdev_init_gpio_out(dev, s->handler, s->lines); 310} 311 312/* 313 * Registers a callback to notify on GPLR reads. This normally 314 * shouldn't be needed but it is used for the hack on Spitz machines. 315 */ 316void pxa2xx_gpio_read_notifier(DeviceState *dev, qemu_irq handler) 317{ 318 PXA2xxGPIOInfo *s = PXA2XX_GPIO(dev); 319 320 s->read_notify = handler; 321} 322 323static const VMStateDescription vmstate_pxa2xx_gpio_regs = { 324 .name = "pxa2xx-gpio", 325 .version_id = 1, 326 .minimum_version_id = 1, 327 .fields = (VMStateField[]) { 328 VMSTATE_UINT32_ARRAY(ilevel, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS), 329 VMSTATE_UINT32_ARRAY(olevel, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS), 330 VMSTATE_UINT32_ARRAY(dir, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS), 331 VMSTATE_UINT32_ARRAY(rising, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS), 332 VMSTATE_UINT32_ARRAY(falling, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS), 333 VMSTATE_UINT32_ARRAY(status, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS), 334 VMSTATE_UINT32_ARRAY(gafr, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS * 2), 335 VMSTATE_UINT32_ARRAY(prev_level, PXA2xxGPIOInfo, PXA2XX_GPIO_BANKS), 336 VMSTATE_END_OF_LIST(), 337 }, 338}; 339 340static Property pxa2xx_gpio_properties[] = { 341 DEFINE_PROP_INT32("lines", PXA2xxGPIOInfo, lines, 0), 342 DEFINE_PROP_INT32("ncpu", PXA2xxGPIOInfo, ncpu, 0), 343 DEFINE_PROP_END_OF_LIST(), 344}; 345 346static void pxa2xx_gpio_class_init(ObjectClass *klass, void *data) 347{ 348 DeviceClass *dc = DEVICE_CLASS(klass); 349 350 dc->desc = "PXA2xx GPIO controller"; 351 device_class_set_props(dc, pxa2xx_gpio_properties); 352 dc->vmsd = &vmstate_pxa2xx_gpio_regs; 353 dc->realize = pxa2xx_gpio_realize; 354} 355 356static const TypeInfo pxa2xx_gpio_info = { 357 .name = TYPE_PXA2XX_GPIO, 358 .parent = TYPE_SYS_BUS_DEVICE, 359 .instance_size = sizeof(PXA2xxGPIOInfo), 360 .instance_init = pxa2xx_gpio_initfn, 361 .class_init = pxa2xx_gpio_class_init, 362}; 363 364static void pxa2xx_gpio_register_types(void) 365{ 366 type_register_static(&pxa2xx_gpio_info); 367} 368 369type_init(pxa2xx_gpio_register_types)