mirror of https://gitee.com/openkylin/qemu.git
113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/*
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* ARM SBCon two-wire serial bus interface (I2C bitbang)
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* a.k.a. ARM Versatile I2C controller
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*
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* Copyright (c) 2006-2007 CodeSourcery.
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* Copyright (c) 2012 Oskar Andero <oskar.andero@gmail.com>
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*
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* This file is derived from hw/realview.c by Paul Brook
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "qemu/osdep.h"
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#include "hw/i2c/arm_sbcon_i2c.h"
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#include "hw/registerfields.h"
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#include "qemu/log.h"
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#include "qemu/module.h"
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#include "qom/object.h"
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typedef ArmSbconI2CState VersatileI2CState;
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DECLARE_INSTANCE_CHECKER(VersatileI2CState, VERSATILE_I2C,
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TYPE_VERSATILE_I2C)
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REG32(CONTROL_GET, 0)
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REG32(CONTROL_SET, 0)
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REG32(CONTROL_CLR, 4)
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#define SCL BIT(0)
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#define SDA BIT(1)
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static uint64_t versatile_i2c_read(void *opaque, hwaddr offset,
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unsigned size)
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{
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VersatileI2CState *s = (VersatileI2CState *)opaque;
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switch (offset) {
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case A_CONTROL_SET:
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return (s->out & 1) | (s->in << 1);
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default:
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qemu_log_mask(LOG_GUEST_ERROR,
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"%s: Bad offset 0x%x\n", __func__, (int)offset);
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return -1;
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}
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}
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static void versatile_i2c_write(void *opaque, hwaddr offset,
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uint64_t value, unsigned size)
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{
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VersatileI2CState *s = (VersatileI2CState *)opaque;
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switch (offset) {
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case A_CONTROL_SET:
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s->out |= value & 3;
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break;
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case A_CONTROL_CLR:
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s->out &= ~value;
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break;
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default:
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qemu_log_mask(LOG_GUEST_ERROR,
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"%s: Bad offset 0x%x\n", __func__, (int)offset);
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}
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bitbang_i2c_set(&s->bitbang, BITBANG_I2C_SCL, (s->out & SCL) != 0);
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s->in = bitbang_i2c_set(&s->bitbang, BITBANG_I2C_SDA, (s->out & SDA) != 0);
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}
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static const MemoryRegionOps versatile_i2c_ops = {
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.read = versatile_i2c_read,
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.write = versatile_i2c_write,
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.endianness = DEVICE_NATIVE_ENDIAN,
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};
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static void versatile_i2c_init(Object *obj)
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{
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DeviceState *dev = DEVICE(obj);
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VersatileI2CState *s = VERSATILE_I2C(obj);
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SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
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I2CBus *bus;
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bus = i2c_init_bus(dev, "i2c");
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bitbang_i2c_init(&s->bitbang, bus);
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memory_region_init_io(&s->iomem, obj, &versatile_i2c_ops, s,
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"arm_sbcon_i2c", 0x1000);
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sysbus_init_mmio(sbd, &s->iomem);
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}
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static const TypeInfo versatile_i2c_info = {
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.name = TYPE_VERSATILE_I2C,
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.parent = TYPE_SYS_BUS_DEVICE,
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.instance_size = sizeof(VersatileI2CState),
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.instance_init = versatile_i2c_init,
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};
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static void versatile_i2c_register_types(void)
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{
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type_register_static(&versatile_i2c_info);
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}
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type_init(versatile_i2c_register_types)
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