hw/arm/digic: add UART support

Signed-off-by: Antony Pavlov <antonynpavlov@gmail.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Message-id: 1387188908-754-5-git-send-email-antonynpavlov@gmail.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Antony Pavlov 2013-12-17 19:42:37 +00:00 committed by Peter Maydell
parent 576e99cb95
commit 142593c9d7
5 changed files with 261 additions and 0 deletions

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@ -24,6 +24,8 @@
#define DIGIC4_TIMER_BASE(n) (0xc0210000 + (n) * 0x100)
#define DIGIC_UART_BASE 0xc0800000
static void digic_init(Object *obj)
{
DigicState *s = DIGIC(obj);
@ -43,6 +45,11 @@ static void digic_init(Object *obj)
snprintf(name, DIGIC_TIMER_NAME_MLEN, "timer[%d]", i);
object_property_add_child(obj, name, OBJECT(&s->timer[i]), NULL);
}
object_initialize(&s->uart, sizeof(s->uart), TYPE_DIGIC_UART);
dev = DEVICE(&s->uart);
qdev_set_parent_bus(dev, sysbus_get_default());
object_property_add_child(obj, "uart", OBJECT(&s->uart), NULL);
}
static void digic_realize(DeviceState *dev, Error **errp)
@ -74,6 +81,15 @@ static void digic_realize(DeviceState *dev, Error **errp)
sbd = SYS_BUS_DEVICE(&s->timer[i]);
sysbus_mmio_map(sbd, 0, DIGIC4_TIMER_BASE(i));
}
object_property_set_bool(OBJECT(&s->uart), true, "realized", &err);
if (err != NULL) {
error_propagate(errp, err);
return;
}
sbd = SYS_BUS_DEVICE(&s->uart);
sysbus_mmio_map(sbd, 0, DIGIC_UART_BASE);
}
static void digic_class_init(ObjectClass *oc, void *data)

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@ -14,6 +14,7 @@ obj-$(CONFIG_COLDFIRE) += mcf_uart.o
obj-$(CONFIG_OMAP) += omap_uart.o
obj-$(CONFIG_SH4) += sh_serial.o
obj-$(CONFIG_PSERIES) += spapr_vty.o
obj-$(CONFIG_DIGIC) += digic-uart.o
common-obj-$(CONFIG_ETRAXFS) += etraxfs_ser.o
common-obj-$(CONFIG_ISA_DEBUG) += debugcon.o

195
hw/char/digic-uart.c Normal file
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@ -0,0 +1,195 @@
/*
* QEMU model of the Canon DIGIC UART block.
*
* Copyright (C) 2013 Antony Pavlov <antonynpavlov@gmail.com>
*
* This model is based on reverse engineering efforts
* made by CHDK (http://chdk.wikia.com) and
* Magic Lantern (http://www.magiclantern.fm) projects
* contributors.
*
* See "Serial terminal" docs here:
* http://magiclantern.wikia.com/wiki/Register_Map#Misc_Registers
*
* The QEMU model of the Milkymist UART block by Michael Walle
* is used as a template.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#include "hw/hw.h"
#include "hw/sysbus.h"
#include "sysemu/char.h"
#include "hw/char/digic-uart.h"
enum {
ST_RX_RDY = (1 << 0),
ST_TX_RDY = (1 << 1),
};
static uint64_t digic_uart_read(void *opaque, hwaddr addr,
unsigned size)
{
DigicUartState *s = opaque;
uint64_t ret = 0;
addr >>= 2;
switch (addr) {
case R_RX:
s->reg_st &= ~(ST_RX_RDY);
ret = s->reg_rx;
break;
case R_ST:
ret = s->reg_st;
break;
default:
qemu_log_mask(LOG_UNIMP,
"digic-uart: read access to unknown register 0x"
TARGET_FMT_plx, addr << 2);
}
return ret;
}
static void digic_uart_write(void *opaque, hwaddr addr, uint64_t value,
unsigned size)
{
DigicUartState *s = opaque;
unsigned char ch = value;
addr >>= 2;
switch (addr) {
case R_TX:
if (s->chr) {
qemu_chr_fe_write_all(s->chr, &ch, 1);
}
break;
case R_ST:
/*
* Ignore write to R_ST.
*
* The point is that this register is actively used
* during receiving and transmitting symbols,
* but we don't know the function of most of bits.
*
* Ignoring writes to R_ST is only a simplification
* of the model. It has no perceptible side effects
* for existing guests.
*/
break;
default:
qemu_log_mask(LOG_UNIMP,
"digic-uart: write access to unknown register 0x"
TARGET_FMT_plx, addr << 2);
}
}
static const MemoryRegionOps uart_mmio_ops = {
.read = digic_uart_read,
.write = digic_uart_write,
.valid = {
.min_access_size = 4,
.max_access_size = 4,
},
.endianness = DEVICE_NATIVE_ENDIAN,
};
static int uart_can_rx(void *opaque)
{
DigicUartState *s = opaque;
return !(s->reg_st & ST_RX_RDY);
}
static void uart_rx(void *opaque, const uint8_t *buf, int size)
{
DigicUartState *s = opaque;
assert(uart_can_rx(opaque));
s->reg_st |= ST_RX_RDY;
s->reg_rx = *buf;
}
static void uart_event(void *opaque, int event)
{
}
static void digic_uart_reset(DeviceState *d)
{
DigicUartState *s = DIGIC_UART(d);
s->reg_rx = 0;
s->reg_st = ST_TX_RDY;
}
static void digic_uart_realize(DeviceState *dev, Error **errp)
{
DigicUartState *s = DIGIC_UART(dev);
s->chr = qemu_char_get_next_serial();
if (s->chr) {
qemu_chr_add_handlers(s->chr, uart_can_rx, uart_rx, uart_event, s);
}
}
static void digic_uart_init(Object *obj)
{
DigicUartState *s = DIGIC_UART(obj);
memory_region_init_io(&s->regs_region, OBJECT(s), &uart_mmio_ops, s,
TYPE_DIGIC_UART, 0x18);
sysbus_init_mmio(SYS_BUS_DEVICE(obj), &s->regs_region);
}
static const VMStateDescription vmstate_digic_uart = {
.name = "digic-uart",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32(reg_rx, DigicUartState),
VMSTATE_UINT32(reg_st, DigicUartState),
VMSTATE_END_OF_LIST()
}
};
static void digic_uart_class_init(ObjectClass *klass, void *data)
{
DeviceClass *dc = DEVICE_CLASS(klass);
dc->realize = digic_uart_realize;
dc->reset = digic_uart_reset;
dc->vmsd = &vmstate_digic_uart;
}
static const TypeInfo digic_uart_info = {
.name = TYPE_DIGIC_UART,
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(DigicUartState),
.instance_init = digic_uart_init,
.class_init = digic_uart_class_init,
};
static void digic_uart_register_types(void)
{
type_register_static(&digic_uart_info);
}
type_init(digic_uart_register_types)

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@ -21,6 +21,7 @@
#include "cpu.h"
#include "hw/timer/digic-timer.h"
#include "hw/char/digic-uart.h"
#define TYPE_DIGIC "digic"
@ -36,6 +37,7 @@ typedef struct DigicState {
ARMCPU cpu;
DigicTimerState timer[DIGIC4_NB_TIMERS];
DigicUartState uart;
} DigicState;
#endif /* HW_ARM_DIGIC_H */

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@ -0,0 +1,47 @@
/*
* Canon DIGIC UART block declarations.
*
* Copyright (C) 2013 Antony Pavlov <antonynpavlov@gmail.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#ifndef HW_CHAR_DIGIC_UART_H
#define HW_CHAR_DIGIC_UART_H
#include "hw/sysbus.h"
#include "qemu/typedefs.h"
#define TYPE_DIGIC_UART "digic-uart"
#define DIGIC_UART(obj) \
OBJECT_CHECK(DigicUartState, (obj), TYPE_DIGIC_UART)
enum {
R_TX = 0x00,
R_RX,
R_ST = (0x14 >> 2),
R_MAX
};
typedef struct DigicUartState {
/*< private >*/
SysBusDevice parent_obj;
/*< public >*/
MemoryRegion regs_region;
CharDriverState *chr;
uint32_t reg_rx;
uint32_t reg_st;
} DigicUartState;
#endif /* HW_CHAR_DIGIC_UART_H */