1 /* 2 * i.MX processors GPIO emulation. 3 * 4 * Copyright (C) 2015 Jean-Christophe Dubois <jcd@tribudubois.net> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 or 9 * (at your option) version 3 of the License. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 * 16 * You should have received a copy of the GNU General Public License along 17 * with this program; if not, see <http://www.gnu.org/licenses/>. 18 */ 19 20 #include "qemu/osdep.h" 21 #include "hw/gpio/imx_gpio.h" 22 #include "hw/irq.h" 23 #include "hw/qdev-properties.h" 24 #include "migration/vmstate.h" 25 #include "qemu/log.h" 26 #include "qemu/module.h" 27 28 #ifndef DEBUG_IMX_GPIO 29 #define DEBUG_IMX_GPIO 0 30 #endif 31 32 typedef enum IMXGPIOLevel { 33 IMX_GPIO_LEVEL_LOW = 0, 34 IMX_GPIO_LEVEL_HIGH = 1, 35 } IMXGPIOLevel; 36 37 #define DPRINTF(fmt, args...) \ 38 do { \ 39 if (DEBUG_IMX_GPIO) { \ 40 fprintf(stderr, "[%s]%s: " fmt , TYPE_IMX_GPIO, \ 41 __func__, ##args); \ 42 } \ 43 } while (0) 44 45 static const char *imx_gpio_reg_name(uint32_t reg) 46 { 47 switch (reg) { 48 case DR_ADDR: 49 return "DR"; 50 case GDIR_ADDR: 51 return "GDIR"; 52 case PSR_ADDR: 53 return "PSR"; 54 case ICR1_ADDR: 55 return "ICR1"; 56 case ICR2_ADDR: 57 return "ICR2"; 58 case IMR_ADDR: 59 return "IMR"; 60 case ISR_ADDR: 61 return "ISR"; 62 case EDGE_SEL_ADDR: 63 return "EDGE_SEL"; 64 default: 65 return "[?]"; 66 } 67 } 68 69 static void imx_gpio_update_int(IMXGPIOState *s) 70 { 71 if (s->has_upper_pin_irq) { 72 qemu_set_irq(s->irq[0], (s->isr & s->imr & 0x0000FFFF) ? 1 : 0); 73 qemu_set_irq(s->irq[1], (s->isr & s->imr & 0xFFFF0000) ? 1 : 0); 74 } else { 75 qemu_set_irq(s->irq[0], (s->isr & s->imr) ? 1 : 0); 76 } 77 } 78 79 static void imx_gpio_set_int_line(IMXGPIOState *s, int line, IMXGPIOLevel level) 80 { 81 /* if this signal isn't configured as an input signal, nothing to do */ 82 if (!extract32(s->gdir, line, 1)) { 83 return; 84 } 85 86 /* When set, EDGE_SEL overrides the ICR config */ 87 if (extract32(s->edge_sel, line, 1)) { 88 /* we detect interrupt on rising and falling edge */ 89 if (extract32(s->psr, line, 1) != level) { 90 /* level changed */ 91 s->isr = deposit32(s->isr, line, 1, 1); 92 } 93 } else if (extract64(s->icr, 2*line + 1, 1)) { 94 /* interrupt is edge sensitive */ 95 if (extract32(s->psr, line, 1) != level) { 96 /* level changed */ 97 if (extract64(s->icr, 2*line, 1) != level) { 98 s->isr = deposit32(s->isr, line, 1, 1); 99 } 100 } 101 } else { 102 /* interrupt is level sensitive */ 103 if (extract64(s->icr, 2*line, 1) == level) { 104 s->isr = deposit32(s->isr, line, 1, 1); 105 } 106 } 107 } 108 109 static void imx_gpio_set(void *opaque, int line, int level) 110 { 111 IMXGPIOState *s = IMX_GPIO(opaque); 112 IMXGPIOLevel imx_level = level ? IMX_GPIO_LEVEL_HIGH : IMX_GPIO_LEVEL_LOW; 113 114 imx_gpio_set_int_line(s, line, imx_level); 115 116 /* this is an input signal, so set PSR */ 117 s->psr = deposit32(s->psr, line, 1, imx_level); 118 119 imx_gpio_update_int(s); 120 } 121 122 static void imx_gpio_set_all_int_lines(IMXGPIOState *s) 123 { 124 int i; 125 126 for (i = 0; i < IMX_GPIO_PIN_COUNT; i++) { 127 IMXGPIOLevel imx_level = extract32(s->psr, i, 1); 128 imx_gpio_set_int_line(s, i, imx_level); 129 } 130 131 imx_gpio_update_int(s); 132 } 133 134 static inline void imx_gpio_set_all_output_lines(IMXGPIOState *s) 135 { 136 int i; 137 138 for (i = 0; i < IMX_GPIO_PIN_COUNT; i++) { 139 /* 140 * if the line is set as output, then forward the line 141 * level to its user. 142 */ 143 if (extract32(s->gdir, i, 1) && s->output[i]) { 144 qemu_set_irq(s->output[i], extract32(s->dr, i, 1)); 145 } 146 } 147 } 148 149 static uint64_t imx_gpio_read(void *opaque, hwaddr offset, unsigned size) 150 { 151 IMXGPIOState *s = IMX_GPIO(opaque); 152 uint32_t reg_value = 0; 153 154 switch (offset) { 155 case DR_ADDR: 156 /* 157 * depending on the "line" configuration, the bit values 158 * are coming either from DR or PSR 159 */ 160 reg_value = (s->dr & s->gdir) | (s->psr & ~s->gdir); 161 break; 162 163 case GDIR_ADDR: 164 reg_value = s->gdir; 165 break; 166 167 case PSR_ADDR: 168 reg_value = s->psr & ~s->gdir; 169 break; 170 171 case ICR1_ADDR: 172 reg_value = extract64(s->icr, 0, 32); 173 break; 174 175 case ICR2_ADDR: 176 reg_value = extract64(s->icr, 32, 32); 177 break; 178 179 case IMR_ADDR: 180 reg_value = s->imr; 181 break; 182 183 case ISR_ADDR: 184 reg_value = s->isr; 185 break; 186 187 case EDGE_SEL_ADDR: 188 if (s->has_edge_sel) { 189 reg_value = s->edge_sel; 190 } else { 191 qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: EDGE_SEL register not " 192 "present on this version of GPIO device\n", 193 TYPE_IMX_GPIO, __func__); 194 } 195 break; 196 197 default: 198 qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%" 199 HWADDR_PRIx "\n", TYPE_IMX_GPIO, __func__, offset); 200 break; 201 } 202 203 DPRINTF("(%s) = 0x%" PRIx32 "\n", imx_gpio_reg_name(offset), reg_value); 204 205 return reg_value; 206 } 207 208 static void imx_gpio_write(void *opaque, hwaddr offset, uint64_t value, 209 unsigned size) 210 { 211 IMXGPIOState *s = IMX_GPIO(opaque); 212 213 DPRINTF("(%s, value = 0x%" PRIx32 ")\n", imx_gpio_reg_name(offset), 214 (uint32_t)value); 215 216 switch (offset) { 217 case DR_ADDR: 218 s->dr = value; 219 imx_gpio_set_all_output_lines(s); 220 break; 221 222 case GDIR_ADDR: 223 s->gdir = value; 224 imx_gpio_set_all_output_lines(s); 225 imx_gpio_set_all_int_lines(s); 226 break; 227 228 case ICR1_ADDR: 229 s->icr = deposit64(s->icr, 0, 32, value); 230 imx_gpio_set_all_int_lines(s); 231 break; 232 233 case ICR2_ADDR: 234 s->icr = deposit64(s->icr, 32, 32, value); 235 imx_gpio_set_all_int_lines(s); 236 break; 237 238 case IMR_ADDR: 239 s->imr = value; 240 imx_gpio_update_int(s); 241 break; 242 243 case ISR_ADDR: 244 s->isr &= ~value; 245 imx_gpio_set_all_int_lines(s); 246 break; 247 248 case EDGE_SEL_ADDR: 249 if (s->has_edge_sel) { 250 s->edge_sel = value; 251 imx_gpio_set_all_int_lines(s); 252 } else { 253 qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: EDGE_SEL register not " 254 "present on this version of GPIO device\n", 255 TYPE_IMX_GPIO, __func__); 256 } 257 break; 258 259 default: 260 qemu_log_mask(LOG_GUEST_ERROR, "[%s]%s: Bad register at offset 0x%" 261 HWADDR_PRIx "\n", TYPE_IMX_GPIO, __func__, offset); 262 break; 263 } 264 265 return; 266 } 267 268 static const MemoryRegionOps imx_gpio_ops = { 269 .read = imx_gpio_read, 270 .write = imx_gpio_write, 271 .valid.min_access_size = 4, 272 .valid.max_access_size = 4, 273 .endianness = DEVICE_NATIVE_ENDIAN, 274 }; 275 276 static const VMStateDescription vmstate_imx_gpio = { 277 .name = TYPE_IMX_GPIO, 278 .version_id = 1, 279 .minimum_version_id = 1, 280 .fields = (VMStateField[]) { 281 VMSTATE_UINT32(dr, IMXGPIOState), 282 VMSTATE_UINT32(gdir, IMXGPIOState), 283 VMSTATE_UINT32(psr, IMXGPIOState), 284 VMSTATE_UINT64(icr, IMXGPIOState), 285 VMSTATE_UINT32(imr, IMXGPIOState), 286 VMSTATE_UINT32(isr, IMXGPIOState), 287 VMSTATE_BOOL(has_edge_sel, IMXGPIOState), 288 VMSTATE_UINT32(edge_sel, IMXGPIOState), 289 VMSTATE_END_OF_LIST() 290 } 291 }; 292 293 static Property imx_gpio_properties[] = { 294 DEFINE_PROP_BOOL("has-edge-sel", IMXGPIOState, has_edge_sel, true), 295 DEFINE_PROP_BOOL("has-upper-pin-irq", IMXGPIOState, has_upper_pin_irq, 296 false), 297 DEFINE_PROP_END_OF_LIST(), 298 }; 299 300 static void imx_gpio_reset(DeviceState *dev) 301 { 302 IMXGPIOState *s = IMX_GPIO(dev); 303 304 s->dr = 0; 305 s->gdir = 0; 306 s->psr = 0; 307 s->icr = 0; 308 s->imr = 0; 309 s->isr = 0; 310 s->edge_sel = 0; 311 312 imx_gpio_set_all_output_lines(s); 313 imx_gpio_update_int(s); 314 } 315 316 static void imx_gpio_realize(DeviceState *dev, Error **errp) 317 { 318 IMXGPIOState *s = IMX_GPIO(dev); 319 320 memory_region_init_io(&s->iomem, OBJECT(s), &imx_gpio_ops, s, 321 TYPE_IMX_GPIO, IMX_GPIO_MEM_SIZE); 322 323 qdev_init_gpio_in(DEVICE(s), imx_gpio_set, IMX_GPIO_PIN_COUNT); 324 qdev_init_gpio_out(DEVICE(s), s->output, IMX_GPIO_PIN_COUNT); 325 326 sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq[0]); 327 sysbus_init_irq(SYS_BUS_DEVICE(dev), &s->irq[1]); 328 sysbus_init_mmio(SYS_BUS_DEVICE(dev), &s->iomem); 329 } 330 331 static void imx_gpio_class_init(ObjectClass *klass, void *data) 332 { 333 DeviceClass *dc = DEVICE_CLASS(klass); 334 335 dc->realize = imx_gpio_realize; 336 dc->reset = imx_gpio_reset; 337 device_class_set_props(dc, imx_gpio_properties); 338 dc->vmsd = &vmstate_imx_gpio; 339 dc->desc = "i.MX GPIO controller"; 340 } 341 342 static const TypeInfo imx_gpio_info = { 343 .name = TYPE_IMX_GPIO, 344 .parent = TYPE_SYS_BUS_DEVICE, 345 .instance_size = sizeof(IMXGPIOState), 346 .class_init = imx_gpio_class_init, 347 }; 348 349 static void imx_gpio_register_types(void) 350 { 351 type_register_static(&imx_gpio_info); 352 } 353 354 type_init(imx_gpio_register_types) 355