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qemu-e2k/hw/milkymist-sysctl.c
Michael Walle 9683242448 lm32: add Milkymist System Controller support 
This patch adds support for Milkymist's System Controller core. The model
has the following features:
 - support for shutting down and restarting the board
 - provide two timers and GPIO
 - provide registers for system identification and reading the boards
   capabilities

Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
2011-04-04 10:26:53 +02:00

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/*
* QEMU model of the Milkymist System Controller.
*
* Copyright (c) 2010 Michael Walle <michael@walle.cc>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, see <http://www.gnu.org/licenses/>.
*
*
* Specification available at:
* http://www.milkymist.org/socdoc/sysctl.pdf
*/
#include "hw.h"
#include "sysbus.h"
#include "sysemu.h"
#include "trace.h"
#include "qemu-timer.h"
#include "qemu-error.h"
enum {
CTRL_ENABLE = (1<<0),
CTRL_AUTORESTART = (1<<1),
};
enum {
ICAP_READY = (1<<0),
};
enum {
R_GPIO_IN = 0,
R_GPIO_OUT,
R_GPIO_INTEN,
R_RESERVED0,
R_TIMER0_CONTROL,
R_TIMER0_COMPARE,
R_TIMER0_COUNTER,
R_RESERVED1,
R_TIMER1_CONTROL,
R_TIMER1_COMPARE,
R_TIMER1_COUNTER,
R_RESERVED2,
R_RESERVED3,
R_ICAP,
R_CAPABILITIES,
R_SYSTEM_ID,
R_MAX
};
struct MilkymistSysctlState {
SysBusDevice busdev;
QEMUBH *bh0;
QEMUBH *bh1;
ptimer_state *ptimer0;
ptimer_state *ptimer1;
uint32_t freq_hz;
uint32_t capabilities;
uint32_t systemid;
uint32_t strappings;
uint32_t regs[R_MAX];
qemu_irq gpio_irq;
qemu_irq timer0_irq;
qemu_irq timer1_irq;
};
typedef struct MilkymistSysctlState MilkymistSysctlState;
static void sysctl_icap_write(MilkymistSysctlState *s, uint32_t value)
{
trace_milkymist_sysctl_icap_write(value);
switch (value & 0xffff) {
case 0x000e:
qemu_system_shutdown_request();
break;
}
}
static uint32_t sysctl_read(void *opaque, target_phys_addr_t addr)
{
MilkymistSysctlState *s = opaque;
uint32_t r = 0;
addr >>= 2;
switch (addr) {
case R_TIMER0_COUNTER:
r = (uint32_t)ptimer_get_count(s->ptimer0);
/* milkymist timer counts up */
r = s->regs[R_TIMER0_COMPARE] - r;
break;
case R_TIMER1_COUNTER:
r = (uint32_t)ptimer_get_count(s->ptimer1);
/* milkymist timer counts up */
r = s->regs[R_TIMER1_COMPARE] - r;
break;
case R_GPIO_IN:
case R_GPIO_OUT:
case R_GPIO_INTEN:
case R_TIMER0_CONTROL:
case R_TIMER0_COMPARE:
case R_TIMER1_CONTROL:
case R_TIMER1_COMPARE:
case R_ICAP:
case R_CAPABILITIES:
case R_SYSTEM_ID:
r = s->regs[addr];
break;
default:
error_report("milkymist_sysctl: read access to unkown register 0x"
TARGET_FMT_plx, addr << 2);
break;
}
trace_milkymist_sysctl_memory_read(addr << 2, r);
return r;
}
static void sysctl_write(void *opaque, target_phys_addr_t addr, uint32_t value)
{
MilkymistSysctlState *s = opaque;
trace_milkymist_sysctl_memory_write(addr, value);
addr >>= 2;
switch (addr) {
case R_GPIO_OUT:
case R_GPIO_INTEN:
case R_TIMER0_COUNTER:
if (value > s->regs[R_TIMER0_COUNTER]) {
value = s->regs[R_TIMER0_COUNTER];
error_report("milkymist_sysctl: timer0: trying to write a "
"value greater than the limit. Clipping.");
}
/* milkymist timer counts up */
value = s->regs[R_TIMER0_COUNTER] - value;
ptimer_set_count(s->ptimer0, value);
break;
case R_TIMER1_COUNTER:
if (value > s->regs[R_TIMER1_COUNTER]) {
value = s->regs[R_TIMER1_COUNTER];
error_report("milkymist_sysctl: timer1: trying to write a "
"value greater than the limit. Clipping.");
}
/* milkymist timer counts up */
value = s->regs[R_TIMER1_COUNTER] - value;
ptimer_set_count(s->ptimer1, value);
break;
case R_TIMER0_COMPARE:
ptimer_set_limit(s->ptimer0, value, 0);
s->regs[addr] = value;
break;
case R_TIMER1_COMPARE:
ptimer_set_limit(s->ptimer1, value, 0);
s->regs[addr] = value;
break;
case R_TIMER0_CONTROL:
s->regs[addr] = value;
if (s->regs[R_TIMER0_CONTROL] & CTRL_ENABLE) {
trace_milkymist_sysctl_start_timer1();
ptimer_run(s->ptimer0, 0);
} else {
trace_milkymist_sysctl_stop_timer1();
ptimer_stop(s->ptimer0);
}
break;
case R_TIMER1_CONTROL:
s->regs[addr] = value;
if (s->regs[R_TIMER1_CONTROL] & CTRL_ENABLE) {
trace_milkymist_sysctl_start_timer1();
ptimer_run(s->ptimer1, 0);
} else {
trace_milkymist_sysctl_stop_timer1();
ptimer_stop(s->ptimer1);
}
break;
case R_ICAP:
sysctl_icap_write(s, value);
break;
case R_SYSTEM_ID:
qemu_system_reset_request();
break;
case R_GPIO_IN:
case R_CAPABILITIES:
error_report("milkymist_sysctl: write to read-only register 0x"
TARGET_FMT_plx, addr << 2);
break;
default:
error_report("milkymist_sysctl: write access to unkown register 0x"
TARGET_FMT_plx, addr << 2);
break;
}
}
static CPUReadMemoryFunc * const sysctl_read_fn[] = {
NULL,
NULL,
&sysctl_read,
};
static CPUWriteMemoryFunc * const sysctl_write_fn[] = {
NULL,
NULL,
&sysctl_write,
};
static void timer0_hit(void *opaque)
{
MilkymistSysctlState *s = opaque;
if (!(s->regs[R_TIMER0_CONTROL] & CTRL_AUTORESTART)) {
s->regs[R_TIMER0_CONTROL] &= ~CTRL_ENABLE;
trace_milkymist_sysctl_stop_timer0();
ptimer_stop(s->ptimer0);
}
trace_milkymist_sysctl_pulse_irq_timer0();
qemu_irq_pulse(s->timer0_irq);
}
static void timer1_hit(void *opaque)
{
MilkymistSysctlState *s = opaque;
if (!(s->regs[R_TIMER1_CONTROL] & CTRL_AUTORESTART)) {
s->regs[R_TIMER1_CONTROL] &= ~CTRL_ENABLE;
trace_milkymist_sysctl_stop_timer1();
ptimer_stop(s->ptimer1);
}
trace_milkymist_sysctl_pulse_irq_timer1();
qemu_irq_pulse(s->timer1_irq);
}
static void milkymist_sysctl_reset(DeviceState *d)
{
MilkymistSysctlState *s =
container_of(d, MilkymistSysctlState, busdev.qdev);
int i;
for (i = 0; i < R_MAX; i++) {
s->regs[i] = 0;
}
ptimer_stop(s->ptimer0);
ptimer_stop(s->ptimer1);
/* defaults */
s->regs[R_ICAP] = ICAP_READY;
s->regs[R_SYSTEM_ID] = s->systemid;
s->regs[R_CAPABILITIES] = s->capabilities;
s->regs[R_GPIO_IN] = s->strappings;
}
static int milkymist_sysctl_init(SysBusDevice *dev)
{
MilkymistSysctlState *s = FROM_SYSBUS(typeof(*s), dev);
int sysctl_regs;
sysbus_init_irq(dev, &s->gpio_irq);
sysbus_init_irq(dev, &s->timer0_irq);
sysbus_init_irq(dev, &s->timer1_irq);
s->bh0 = qemu_bh_new(timer0_hit, s);
s->bh1 = qemu_bh_new(timer1_hit, s);
s->ptimer0 = ptimer_init(s->bh0);
s->ptimer1 = ptimer_init(s->bh1);
ptimer_set_freq(s->ptimer0, s->freq_hz);
ptimer_set_freq(s->ptimer1, s->freq_hz);
sysctl_regs = cpu_register_io_memory(sysctl_read_fn, sysctl_write_fn, s,
DEVICE_NATIVE_ENDIAN);
sysbus_init_mmio(dev, R_MAX * 4, sysctl_regs);
return 0;
}
static const VMStateDescription vmstate_milkymist_sysctl = {
.name = "milkymist-sysctl",
.version_id = 1,
.minimum_version_id = 1,
.minimum_version_id_old = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT32_ARRAY(regs, MilkymistSysctlState, R_MAX),
VMSTATE_PTIMER(ptimer0, MilkymistSysctlState),
VMSTATE_PTIMER(ptimer1, MilkymistSysctlState),
VMSTATE_END_OF_LIST()
}
};
static SysBusDeviceInfo milkymist_sysctl_info = {
.init = milkymist_sysctl_init,
.qdev.name = "milkymist-sysctl",
.qdev.size = sizeof(MilkymistSysctlState),
.qdev.vmsd = &vmstate_milkymist_sysctl,
.qdev.reset = milkymist_sysctl_reset,
.qdev.props = (Property[]) {
DEFINE_PROP_UINT32("frequency", MilkymistSysctlState,
freq_hz, 80000000),
DEFINE_PROP_UINT32("capabilities", MilkymistSysctlState,
capabilities, 0x00000000),
DEFINE_PROP_UINT32("systemid", MilkymistSysctlState,
systemid, 0x10014d31),
DEFINE_PROP_UINT32("gpio_strappings", MilkymistSysctlState,
strappings, 0x00000001),
DEFINE_PROP_END_OF_LIST(),
}
};
static void milkymist_sysctl_register(void)
{
sysbus_register_withprop(&milkymist_sysctl_info);
}
device_init(milkymist_sysctl_register)
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