/* * Maxim MAX1110/1111 ADC chip emulation. * * Copyright (c) 2006 Openedhand Ltd. * Written by Andrzej Zaborowski <balrog@zabor.org> * * This code is licensed under the GNU GPLv2. * * Contributions after 2012-01-13 are licensed under the terms of the * GNU GPL, version 2 or (at your option) any later version. */ #include "qemu/osdep.h" #include "hw/adc/max111x.h" #include "hw/irq.h" #include "migration/vmstate.h" #include "qemu/module.h" #include "hw/qdev-properties.h" /* Control-byte bitfields */ #define CB_PD0 (1 << 0) #define CB_PD1 (1 << 1) #define CB_SGL (1 << 2) #define CB_UNI (1 << 3) #define CB_SEL0 (1 << 4) #define CB_SEL1 (1 << 5) #define CB_SEL2 (1 << 6) #define CB_START (1 << 7) #define CHANNEL_NUM(v, b0, b1, b2) \ ((((v) >> (2 + (b0))) & 4) | \ (((v) >> (3 + (b1))) & 2) | \ (((v) >> (4 + (b2))) & 1)) static uint32_t max111x_read(MAX111xState *s) { if (!s->tb1) return 0; switch (s->cycle ++) { case 1: return s->rb2; case 2: return s->rb3; } return 0; } /* Interpret a control-byte */ static void max111x_write(MAX111xState *s, uint32_t value) { int measure, chan; /* Ignore the value if START bit is zero */ if (!(value & CB_START)) return; s->cycle = 0; if (!(value & CB_PD1)) { s->tb1 = 0; return; } s->tb1 = value; if (s->inputs == 8) chan = CHANNEL_NUM(value, 1, 0, 2); else chan = CHANNEL_NUM(value & ~CB_SEL0, 0, 1, 2); if (value & CB_SGL) measure = s->input[chan] - s->com; else measure = s->input[chan] - s->input[chan ^ 1]; if (!(value & CB_UNI)) measure ^= 0x80; s->rb2 = (measure >> 2) & 0x3f; s->rb3 = (measure << 6) & 0xc0; /* FIXME: When should the IRQ be lowered? */ qemu_irq_raise(s->interrupt); } static uint32_t max111x_transfer(SSIPeripheral *dev, uint32_t value) { MAX111xState *s = MAX_111X(dev); max111x_write(s, value); return max111x_read(s); } static const VMStateDescription vmstate_max111x = { .name = "max111x", .version_id = 1, .minimum_version_id = 1, .fields = (VMStateField[]) { VMSTATE_SSI_PERIPHERAL(parent_obj, MAX111xState), VMSTATE_UINT8(tb1, MAX111xState), VMSTATE_UINT8(rb2, MAX111xState), VMSTATE_UINT8(rb3, MAX111xState), VMSTATE_INT32_EQUAL(inputs, MAX111xState, NULL), VMSTATE_INT32(com, MAX111xState), VMSTATE_ARRAY_INT32_UNSAFE(input, MAX111xState, inputs, vmstate_info_uint8, uint8_t), VMSTATE_END_OF_LIST() } }; static void max111x_input_set(void *opaque, int line, int value) { MAX111xState *s = MAX_111X(opaque); assert(line >= 0 && line < s->inputs); s->input[line] = value; } static int max111x_init(SSIPeripheral *d, int inputs) { DeviceState *dev = DEVICE(d); MAX111xState *s = MAX_111X(dev); qdev_init_gpio_out(dev, &s->interrupt, 1); qdev_init_gpio_in(dev, max111x_input_set, inputs); s->inputs = inputs; return 0; } static void max1110_realize(SSIPeripheral *dev, Error **errp) { max111x_init(dev, 8); } static void max1111_realize(SSIPeripheral *dev, Error **errp) { max111x_init(dev, 4); } static void max111x_reset(DeviceState *dev) { MAX111xState *s = MAX_111X(dev); int i; for (i = 0; i < s->inputs; i++) { s->input[i] = s->reset_input[i]; } s->com = 0; s->tb1 = 0; s->rb2 = 0; s->rb3 = 0; s->cycle = 0; } static Property max1110_properties[] = { /* Reset values for ADC inputs */ DEFINE_PROP_UINT8("input0", MAX111xState, reset_input[0], 0xf0), DEFINE_PROP_UINT8("input1", MAX111xState, reset_input[1], 0xe0), DEFINE_PROP_UINT8("input2", MAX111xState, reset_input[2], 0xd0), DEFINE_PROP_UINT8("input3", MAX111xState, reset_input[3], 0xc0), DEFINE_PROP_END_OF_LIST(), }; static Property max1111_properties[] = { /* Reset values for ADC inputs */ DEFINE_PROP_UINT8("input0", MAX111xState, reset_input[0], 0xf0), DEFINE_PROP_UINT8("input1", MAX111xState, reset_input[1], 0xe0), DEFINE_PROP_UINT8("input2", MAX111xState, reset_input[2], 0xd0), DEFINE_PROP_UINT8("input3", MAX111xState, reset_input[3], 0xc0), DEFINE_PROP_UINT8("input4", MAX111xState, reset_input[4], 0xb0), DEFINE_PROP_UINT8("input5", MAX111xState, reset_input[5], 0xa0), DEFINE_PROP_UINT8("input6", MAX111xState, reset_input[6], 0x90), DEFINE_PROP_UINT8("input7", MAX111xState, reset_input[7], 0x80), DEFINE_PROP_END_OF_LIST(), }; static void max111x_class_init(ObjectClass *klass, void *data) { SSIPeripheralClass *k = SSI_PERIPHERAL_CLASS(klass); DeviceClass *dc = DEVICE_CLASS(klass); k->transfer = max111x_transfer; dc->reset = max111x_reset; dc->vmsd = &vmstate_max111x; set_bit(DEVICE_CATEGORY_MISC, dc->categories); } static const TypeInfo max111x_info = { .name = TYPE_MAX_111X, .parent = TYPE_SSI_PERIPHERAL, .instance_size = sizeof(MAX111xState), .class_init = max111x_class_init, .abstract = true, }; static void max1110_class_init(ObjectClass *klass, void *data) { SSIPeripheralClass *k = SSI_PERIPHERAL_CLASS(klass); DeviceClass *dc = DEVICE_CLASS(klass); k->realize = max1110_realize; device_class_set_props(dc, max1110_properties); } static const TypeInfo max1110_info = { .name = TYPE_MAX_1110, .parent = TYPE_MAX_111X, .class_init = max1110_class_init, }; static void max1111_class_init(ObjectClass *klass, void *data) { SSIPeripheralClass *k = SSI_PERIPHERAL_CLASS(klass); DeviceClass *dc = DEVICE_CLASS(klass); k->realize = max1111_realize; device_class_set_props(dc, max1111_properties); } static const TypeInfo max1111_info = { .name = TYPE_MAX_1111, .parent = TYPE_MAX_111X, .class_init = max1111_class_init, }; static void max111x_register_types(void) { type_register_static(&max111x_info); type_register_static(&max1110_info); type_register_static(&max1111_info); } type_init(max111x_register_types)