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hw/arm_sysctl: Implement SYS_CFG_VOLT

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Implement the SYS_CFG_VOLT registers which return the voltage
of various supplies on motherboard and daughterboard. Since
QEMU implements a perfectly stable power supply these registers
always return a constant value. The number and value of the
daughterboard voltages is dependent on the specific daughterboard,
so we use a property array to allow the board to configure them
appropriately.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2013-03-15 16:41:57 +00:00
parent 0be6bfac62
commit 8bd4824a61
1 changed files with 26 additions and 0 deletions
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26
hw/arm_sysctl.c
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@ -35,6 +35,8 @@ typedef struct {
uint32_t sys_cfgctrl;
uint32_t sys_cfgstat;
uint32_t sys_clcd;
uint32_t db_num_vsensors;
uint32_t *db_voltage;
} arm_sysctl_state;
static const VMStateDescription vmstate_arm_sysctl = {
@ -236,6 +238,19 @@ static bool vexpress_cfgctrl_read(arm_sysctl_state *s, unsigned int dcc,
}
switch (function) {
case SYS_CFG_VOLT:
if (site == SYS_CFG_SITE_DB1 && device < s->db_num_vsensors) {
*val = s->db_voltage[device];
return true;
}
if (site == SYS_CFG_SITE_MB && device == 0) {
/* There is only one motherboard voltage sensor:
* VIO : 3.3V : bus voltage between mother and daughterboard
*/
*val = 3300000;
return true;
}
break;
default:
break;
}
@ -537,9 +552,19 @@ static void arm_sysctl_init(Object *obj)
qdev_init_gpio_out(dev, &s->pl110_mux_ctrl, 1);
}
static void arm_sysctl_finalize(Object *obj)
{
SysBusDevice *dev = SYS_BUS_DEVICE(obj);
arm_sysctl_state *s = FROM_SYSBUS(arm_sysctl_state, dev);
g_free(s->db_voltage);
}
static Property arm_sysctl_properties[] = {
DEFINE_PROP_UINT32("sys_id", arm_sysctl_state, sys_id, 0),
DEFINE_PROP_UINT32("proc_id", arm_sysctl_state, proc_id, 0),
/* Daughterboard power supply voltages (as reported via SYS_CFG) */
DEFINE_PROP_ARRAY("db-voltage", arm_sysctl_state, db_num_vsensors,
db_voltage, qdev_prop_uint32, uint32_t),
DEFINE_PROP_END_OF_LIST(),
};
@ -557,6 +582,7 @@ static const TypeInfo arm_sysctl_info = {
.parent = TYPE_SYS_BUS_DEVICE,
.instance_size = sizeof(arm_sysctl_state),
.instance_init = arm_sysctl_init,
.instance_finalize = arm_sysctl_finalize,
.class_init = arm_sysctl_class_init,
};