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7673bb4cd3
This enables qemu to handle late inits and report errors. All the SSI slave routine names were changed accordingly. Code was modified to handle errors when possible (m25p80 and ssi-sd) Tested with the m25p80 slave object. Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Cédric Le Goater <clg@kaod.org> Message-id: 1467138270-32481-2-git-send-email-clg@kaod.org Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
216 lines
4.8 KiB
C
216 lines
4.8 KiB
C
/*
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* Maxim MAX1110/1111 ADC chip emulation.
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*
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* Copyright (c) 2006 Openedhand Ltd.
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* Written by Andrzej Zaborowski <balrog@zabor.org>
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*
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* This code is licensed under the GNU GPLv2.
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*
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* Contributions after 2012-01-13 are licensed under the terms of the
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* GNU GPL, version 2 or (at your option) any later version.
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*/
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#include "qemu/osdep.h"
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#include "hw/ssi/ssi.h"
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typedef struct {
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SSISlave parent_obj;
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qemu_irq interrupt;
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uint8_t tb1, rb2, rb3;
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int cycle;
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uint8_t input[8];
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int inputs, com;
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} MAX111xState;
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#define TYPE_MAX_111X "max111x"
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#define MAX_111X(obj) \
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OBJECT_CHECK(MAX111xState, (obj), TYPE_MAX_111X)
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#define TYPE_MAX_1110 "max1110"
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#define TYPE_MAX_1111 "max1111"
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/* Control-byte bitfields */
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#define CB_PD0 (1 << 0)
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#define CB_PD1 (1 << 1)
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#define CB_SGL (1 << 2)
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#define CB_UNI (1 << 3)
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#define CB_SEL0 (1 << 4)
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#define CB_SEL1 (1 << 5)
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#define CB_SEL2 (1 << 6)
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#define CB_START (1 << 7)
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#define CHANNEL_NUM(v, b0, b1, b2) \
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((((v) >> (2 + (b0))) & 4) | \
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(((v) >> (3 + (b1))) & 2) | \
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(((v) >> (4 + (b2))) & 1))
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static uint32_t max111x_read(MAX111xState *s)
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{
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if (!s->tb1)
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return 0;
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switch (s->cycle ++) {
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case 1:
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return s->rb2;
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case 2:
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return s->rb3;
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}
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return 0;
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}
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/* Interpret a control-byte */
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static void max111x_write(MAX111xState *s, uint32_t value)
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{
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int measure, chan;
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/* Ignore the value if START bit is zero */
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if (!(value & CB_START))
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return;
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s->cycle = 0;
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if (!(value & CB_PD1)) {
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s->tb1 = 0;
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return;
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}
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s->tb1 = value;
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if (s->inputs == 8)
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chan = CHANNEL_NUM(value, 1, 0, 2);
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else
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chan = CHANNEL_NUM(value & ~CB_SEL0, 0, 1, 2);
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if (value & CB_SGL)
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measure = s->input[chan] - s->com;
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else
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measure = s->input[chan] - s->input[chan ^ 1];
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if (!(value & CB_UNI))
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measure ^= 0x80;
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s->rb2 = (measure >> 2) & 0x3f;
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s->rb3 = (measure << 6) & 0xc0;
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/* FIXME: When should the IRQ be lowered? */
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qemu_irq_raise(s->interrupt);
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}
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static uint32_t max111x_transfer(SSISlave *dev, uint32_t value)
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{
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MAX111xState *s = MAX_111X(dev);
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max111x_write(s, value);
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return max111x_read(s);
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}
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static const VMStateDescription vmstate_max111x = {
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.name = "max111x",
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.version_id = 1,
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.minimum_version_id = 1,
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.fields = (VMStateField[]) {
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VMSTATE_SSI_SLAVE(parent_obj, MAX111xState),
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VMSTATE_UINT8(tb1, MAX111xState),
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VMSTATE_UINT8(rb2, MAX111xState),
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VMSTATE_UINT8(rb3, MAX111xState),
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VMSTATE_INT32_EQUAL(inputs, MAX111xState),
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VMSTATE_INT32(com, MAX111xState),
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VMSTATE_ARRAY_INT32_UNSAFE(input, MAX111xState, inputs,
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vmstate_info_uint8, uint8_t),
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VMSTATE_END_OF_LIST()
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}
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};
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static int max111x_init(SSISlave *d, int inputs)
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{
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DeviceState *dev = DEVICE(d);
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MAX111xState *s = MAX_111X(dev);
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qdev_init_gpio_out(dev, &s->interrupt, 1);
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s->inputs = inputs;
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/* TODO: add a user interface for setting these */
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s->input[0] = 0xf0;
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s->input[1] = 0xe0;
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s->input[2] = 0xd0;
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s->input[3] = 0xc0;
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s->input[4] = 0xb0;
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s->input[5] = 0xa0;
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s->input[6] = 0x90;
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s->input[7] = 0x80;
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s->com = 0;
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vmstate_register(dev, -1, &vmstate_max111x, s);
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return 0;
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}
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static void max1110_realize(SSISlave *dev, Error **errp)
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{
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max111x_init(dev, 8);
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}
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static void max1111_realize(SSISlave *dev, Error **errp)
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{
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max111x_init(dev, 4);
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}
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void max111x_set_input(DeviceState *dev, int line, uint8_t value)
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{
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MAX111xState *s = MAX_111X(dev);
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assert(line >= 0 && line < s->inputs);
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s->input[line] = value;
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}
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static void max111x_class_init(ObjectClass *klass, void *data)
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{
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SSISlaveClass *k = SSI_SLAVE_CLASS(klass);
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k->transfer = max111x_transfer;
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}
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static const TypeInfo max111x_info = {
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.name = TYPE_MAX_111X,
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.parent = TYPE_SSI_SLAVE,
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.instance_size = sizeof(MAX111xState),
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.class_init = max111x_class_init,
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.abstract = true,
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};
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static void max1110_class_init(ObjectClass *klass, void *data)
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{
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SSISlaveClass *k = SSI_SLAVE_CLASS(klass);
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k->realize = max1110_realize;
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}
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static const TypeInfo max1110_info = {
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.name = TYPE_MAX_1110,
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.parent = TYPE_MAX_111X,
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.class_init = max1110_class_init,
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};
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static void max1111_class_init(ObjectClass *klass, void *data)
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{
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SSISlaveClass *k = SSI_SLAVE_CLASS(klass);
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k->realize = max1111_realize;
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}
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static const TypeInfo max1111_info = {
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.name = TYPE_MAX_1111,
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.parent = TYPE_MAX_111X,
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.class_init = max1111_class_init,
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};
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static void max111x_register_types(void)
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{
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type_register_static(&max111x_info);
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type_register_static(&max1110_info);
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type_register_static(&max1111_info);
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}
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type_init(max111x_register_types)
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