1 /* 2 * PowerMac NewWorld MacIO GPIO emulation 3 * 4 * Copyright (c) 2016 Benjamin Herrenschmidt 5 * Copyright (c) 2018 Mark Cave-Ayland 6 * 7 * Permission is hereby granted, free of charge, to any person obtaining a copy 8 * of this software and associated documentation files (the "Software"), to deal 9 * in the Software without restriction, including without limitation the rights 10 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 11 * copies of the Software, and to permit persons to whom the Software is 12 * furnished to do so, subject to the following conditions: 13 * 14 * The above copyright notice and this permission notice shall be included in 15 * all copies or substantial portions of the Software. 16 * 17 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 18 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 19 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 20 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 21 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 22 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 23 * THE SOFTWARE. 24 */ 25 26 #include "qemu/osdep.h" 27 #include "hw/ppc/mac.h" 28 #include "hw/qdev-properties.h" 29 #include "migration/vmstate.h" 30 #include "hw/misc/macio/macio.h" 31 #include "hw/misc/macio/gpio.h" 32 #include "hw/nmi.h" 33 #include "qemu/log.h" 34 #include "qemu/module.h" 35 #include "trace.h" 36 37 38 void macio_set_gpio(MacIOGPIOState *s, uint32_t gpio, bool state) 39 { 40 uint8_t new_reg; 41 42 trace_macio_set_gpio(gpio, state); 43 44 if (s->gpio_regs[gpio] & 4) { 45 qemu_log_mask(LOG_GUEST_ERROR, 46 "GPIO: Setting GPIO %d while it's an output\n", gpio); 47 } 48 49 new_reg = s->gpio_regs[gpio] & ~2; 50 if (state) { 51 new_reg |= 2; 52 } 53 54 if (new_reg == s->gpio_regs[gpio]) { 55 return; 56 } 57 58 s->gpio_regs[gpio] = new_reg; 59 60 /* This is will work until we fix the binding between MacIO and 61 * the MPIC properly so we can route all GPIOs and avoid going 62 * via the top level platform code. 63 * 64 * Note that we probably need to get access to the MPIC config to 65 * decode polarity since qemu always use "raise" regardless. 66 * 67 * For now, we hard wire known GPIOs 68 */ 69 70 switch (gpio) { 71 case 1: 72 /* Level low */ 73 if (!state) { 74 trace_macio_gpio_irq_assert(gpio); 75 qemu_irq_raise(s->gpio_extirqs[gpio]); 76 } else { 77 trace_macio_gpio_irq_deassert(gpio); 78 qemu_irq_lower(s->gpio_extirqs[gpio]); 79 } 80 break; 81 82 case 9: 83 /* Edge, triggered by NMI below */ 84 if (state) { 85 trace_macio_gpio_irq_assert(gpio); 86 qemu_irq_raise(s->gpio_extirqs[gpio]); 87 } else { 88 trace_macio_gpio_irq_deassert(gpio); 89 qemu_irq_lower(s->gpio_extirqs[gpio]); 90 } 91 break; 92 93 default: 94 qemu_log_mask(LOG_UNIMP, "GPIO: setting unimplemented GPIO %d", gpio); 95 } 96 } 97 98 static void macio_gpio_write(void *opaque, hwaddr addr, uint64_t value, 99 unsigned size) 100 { 101 MacIOGPIOState *s = opaque; 102 uint8_t ibit; 103 104 trace_macio_gpio_write(addr, value); 105 106 /* Levels regs are read-only */ 107 if (addr < 8) { 108 return; 109 } 110 111 addr -= 8; 112 if (addr < 36) { 113 value &= ~2; 114 115 if (value & 4) { 116 ibit = (value & 1) << 1; 117 } else { 118 ibit = s->gpio_regs[addr] & 2; 119 } 120 121 s->gpio_regs[addr] = value | ibit; 122 } 123 } 124 125 static uint64_t macio_gpio_read(void *opaque, hwaddr addr, unsigned size) 126 { 127 MacIOGPIOState *s = opaque; 128 uint64_t val = 0; 129 130 /* Levels regs */ 131 if (addr < 8) { 132 val = s->gpio_levels[addr]; 133 } else { 134 addr -= 8; 135 136 if (addr < 36) { 137 val = s->gpio_regs[addr]; 138 } 139 } 140 141 trace_macio_gpio_write(addr, val); 142 return val; 143 } 144 145 static const MemoryRegionOps macio_gpio_ops = { 146 .read = macio_gpio_read, 147 .write = macio_gpio_write, 148 .endianness = DEVICE_LITTLE_ENDIAN, 149 .impl = { 150 .min_access_size = 1, 151 .max_access_size = 1, 152 }, 153 }; 154 155 static void macio_gpio_realize(DeviceState *dev, Error **errp) 156 { 157 MacIOGPIOState *s = MACIO_GPIO(dev); 158 159 s->gpio_extirqs[1] = qdev_get_gpio_in(DEVICE(s->pic), 160 NEWWORLD_EXTING_GPIO1); 161 s->gpio_extirqs[9] = qdev_get_gpio_in(DEVICE(s->pic), 162 NEWWORLD_EXTING_GPIO9); 163 } 164 165 static void macio_gpio_init(Object *obj) 166 { 167 SysBusDevice *sbd = SYS_BUS_DEVICE(obj); 168 MacIOGPIOState *s = MACIO_GPIO(obj); 169 170 object_property_add_link(obj, "pic", TYPE_OPENPIC, 171 (Object **) &s->pic, 172 qdev_prop_allow_set_link_before_realize, 173 0, NULL); 174 175 memory_region_init_io(&s->gpiomem, OBJECT(s), &macio_gpio_ops, obj, 176 "gpio", 0x30); 177 sysbus_init_mmio(sbd, &s->gpiomem); 178 } 179 180 static const VMStateDescription vmstate_macio_gpio = { 181 .name = "macio_gpio", 182 .version_id = 0, 183 .minimum_version_id = 0, 184 .fields = (VMStateField[]) { 185 VMSTATE_UINT8_ARRAY(gpio_levels, MacIOGPIOState, 8), 186 VMSTATE_UINT8_ARRAY(gpio_regs, MacIOGPIOState, 36), 187 VMSTATE_END_OF_LIST() 188 } 189 }; 190 191 static void macio_gpio_reset(DeviceState *dev) 192 { 193 MacIOGPIOState *s = MACIO_GPIO(dev); 194 195 /* GPIO 1 is up by default */ 196 macio_set_gpio(s, 1, true); 197 } 198 199 static void macio_gpio_nmi(NMIState *n, int cpu_index, Error **errp) 200 { 201 macio_set_gpio(MACIO_GPIO(n), 9, true); 202 macio_set_gpio(MACIO_GPIO(n), 9, false); 203 } 204 205 static void macio_gpio_class_init(ObjectClass *oc, void *data) 206 { 207 DeviceClass *dc = DEVICE_CLASS(oc); 208 NMIClass *nc = NMI_CLASS(oc); 209 210 dc->realize = macio_gpio_realize; 211 dc->reset = macio_gpio_reset; 212 dc->vmsd = &vmstate_macio_gpio; 213 nc->nmi_monitor_handler = macio_gpio_nmi; 214 } 215 216 static const TypeInfo macio_gpio_init_info = { 217 .name = TYPE_MACIO_GPIO, 218 .parent = TYPE_SYS_BUS_DEVICE, 219 .instance_size = sizeof(MacIOGPIOState), 220 .instance_init = macio_gpio_init, 221 .class_init = macio_gpio_class_init, 222 .interfaces = (InterfaceInfo[]) { 223 { TYPE_NMI }, 224 { } 225 }, 226 }; 227 228 static void macio_gpio_register_types(void) 229 { 230 type_register_static(&macio_gpio_init_info); 231 } 232 233 type_init(macio_gpio_register_types) 234