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hw/misc: Add GPIOs for duty in NPCM7xx PWM

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This patch adds GPIOs in NPCM7xx PWM module for its duty values.
The purpose of this is to connect it to the MFT module to provide
an input for measuring a PWM fan's RPM. Each PWM module has
NPCM7XX_PWM_PER_MODULE of GPIOs, each one corresponds to
one PWM instance and can connect to multiple fan instances in MFT.

Reviewed-by: Doug Evans <dje@google.com>
Reviewed-by: Tyrone Ting <kfting@nuvoton.com>
Signed-off-by: Hao Wu <wuhaotsh@google.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Message-id: 20210311180855.149764-2-wuhaotsh@google.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Hao Wu 2021-03-11 10:08:51 -08:00 committed by Peter Maydell
parent bcb902a1ed
commit 71b50b9d1c
2 changed files with 7 additions and 1 deletions
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4
hw/misc/npcm7xx_pwm.c
View File

@ -139,6 +139,7 @@ static void npcm7xx_pwm_update_duty(NPCM7xxPWM *p)
trace_npcm7xx_pwm_update_duty(DEVICE(p->module)->canonical_path,
p->index, p->duty, duty);
p->duty = duty;
qemu_set_irq(p->module->duty_gpio_out[p->index], p->duty);
}
}
@ -483,6 +484,7 @@ static void npcm7xx_pwm_init(Object *obj)
SysBusDevice *sbd = SYS_BUS_DEVICE(obj);
int i;
QEMU_BUILD_BUG_ON(ARRAY_SIZE(s->pwm) != NPCM7XX_PWM_PER_MODULE);
for (i = 0; i < NPCM7XX_PWM_PER_MODULE; i++) {
NPCM7xxPWM *p = &s->pwm[i];
p->module = s;
@ -501,6 +503,8 @@ static void npcm7xx_pwm_init(Object *obj)
object_property_add_uint32_ptr(obj, "duty[*]",
&s->pwm[i].duty, OBJ_PROP_FLAG_READ);
}
qdev_init_gpio_out_named(DEVICE(s), s->duty_gpio_out,
"duty-gpio-out", NPCM7XX_PWM_PER_MODULE);
}
static const VMStateDescription vmstate_npcm7xx_pwm = {

4
include/hw/misc/npcm7xx_pwm.h
View File

@ -77,6 +77,7 @@ typedef struct NPCM7xxPWM {
* @iomem: Memory region through which registers are accessed.
* @clock: The PWM clock.
* @pwm: The PWM channels owned by this module.
* @duty_gpio_out: The duty cycle of each PWM channels as a output GPIO.
* @ppr: The prescaler register.
* @csr: The clock selector register.
* @pcr: The control register.
@ -89,7 +90,8 @@ struct NPCM7xxPWMState {
MemoryRegion iomem;
Clock *clock;
NPCM7xxPWM pwm[NPCM7XX_PWM_PER_MODULE];
NPCM7xxPWM pwm[NPCM7XX_PWM_PER_MODULE];
qemu_irq duty_gpio_out[NPCM7XX_PWM_PER_MODULE];
uint32_t ppr;
uint32_t csr;