[v3,4/9] hw/timer: Add basic M41T80 emulation

Message ID 05a82ed894d046e64e94dc2218543199c11fa498.1528935420.git.balaton@eik.bme.hu
State New
Headers show
Series
  • Misc sam460ex improvements
Related show

Commit Message

BALATON Zoltan June 14, 2018, 12:17 a.m.
Basic emulation of the M41T80 serial (I2C) RTC chip. Only getting time
of day is implemented. Setting time and RTC alarm are not supported.

Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>
---

Notes:
    v3: Fixed \n-s in log messages

 MAINTAINERS                     |   1 +
 default-configs/ppc-softmmu.mak |   1 +
 hw/timer/Makefile.objs          |   1 +
 hw/timer/m41t80.c               | 117 ++++++++++++++++++++++++++++++++++++++++
 4 files changed, 120 insertions(+)
 create mode 100644 hw/timer/m41t80.c

Comments

David Gibson June 14, 2018, 1:36 a.m. | #1
On Thu, Jun 14, 2018 at 02:17:00AM +0200, BALATON Zoltan wrote:
> Basic emulation of the M41T80 serial (I2C) RTC chip. Only getting time
> of day is implemented. Setting time and RTC alarm are not supported.
> 
> Signed-off-by: BALATON Zoltan <balaton@eik.bme.hu>

Acked-by: David Gibson <david@gibson.dropbear.id.au>

> ---
> 
> Notes:
>     v3: Fixed \n-s in log messages
> 
>  MAINTAINERS                     |   1 +
>  default-configs/ppc-softmmu.mak |   1 +
>  hw/timer/Makefile.objs          |   1 +
>  hw/timer/m41t80.c               | 117 ++++++++++++++++++++++++++++++++++++++++
>  4 files changed, 120 insertions(+)
>  create mode 100644 hw/timer/m41t80.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 8a94517..74ae589 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -829,6 +829,7 @@ M: BALATON Zoltan <balaton@eik.bme.hu>
>  L: qemu-ppc@nongnu.org
>  S: Maintained
>  F: hw/ide/sii3112.c
> +F: hw/timer/m41t80.c
>  
>  SH4 Machines
>  ------------
> diff --git a/default-configs/ppc-softmmu.mak b/default-configs/ppc-softmmu.mak
> index 7d0dc2f..9fbaadc 100644
> --- a/default-configs/ppc-softmmu.mak
> +++ b/default-configs/ppc-softmmu.mak
> @@ -27,6 +27,7 @@ CONFIG_SM501=y
>  CONFIG_IDE_SII3112=y
>  CONFIG_I2C=y
>  CONFIG_BITBANG_I2C=y
> +CONFIG_M41T80=y
>  
>  # For Macs
>  CONFIG_MAC=y
> diff --git a/hw/timer/Makefile.objs b/hw/timer/Makefile.objs
> index 8b27a4b..e16b2b9 100644
> --- a/hw/timer/Makefile.objs
> +++ b/hw/timer/Makefile.objs
> @@ -6,6 +6,7 @@ common-obj-$(CONFIG_CADENCE) += cadence_ttc.o
>  common-obj-$(CONFIG_DS1338) += ds1338.o
>  common-obj-$(CONFIG_HPET) += hpet.o
>  common-obj-$(CONFIG_I8254) += i8254_common.o i8254.o
> +common-obj-$(CONFIG_M41T80) += m41t80.o
>  common-obj-$(CONFIG_M48T59) += m48t59.o
>  ifeq ($(CONFIG_ISA_BUS),y)
>  common-obj-$(CONFIG_M48T59) += m48t59-isa.o
> diff --git a/hw/timer/m41t80.c b/hw/timer/m41t80.c
> new file mode 100644
> index 0000000..734d7d9
> --- /dev/null
> +++ b/hw/timer/m41t80.c
> @@ -0,0 +1,117 @@
> +/*
> + * M41T80 serial rtc emulation
> + *
> + * Copyright (c) 2018 BALATON Zoltan
> + *
> + * This work is licensed under the GNU GPL license version 2 or later.
> + *
> + */
> +
> +#include "qemu/osdep.h"
> +#include "qemu/log.h"
> +#include "qemu/timer.h"
> +#include "qemu/bcd.h"
> +#include "hw/i2c/i2c.h"
> +
> +#define TYPE_M41T80 "m41t80"
> +#define M41T80(obj) OBJECT_CHECK(M41t80State, (obj), TYPE_M41T80)
> +
> +typedef struct M41t80State {
> +    I2CSlave parent_obj;
> +    int8_t addr;
> +} M41t80State;
> +
> +static void m41t80_realize(DeviceState *dev, Error **errp)
> +{
> +    M41t80State *s = M41T80(dev);
> +
> +    s->addr = -1;
> +}
> +
> +static int m41t80_send(I2CSlave *i2c, uint8_t data)
> +{
> +    M41t80State *s = M41T80(i2c);
> +
> +    if (s->addr < 0) {
> +        s->addr = data;
> +    } else {
> +        s->addr++;
> +    }
> +    return 0;
> +}
> +
> +static int m41t80_recv(I2CSlave *i2c)
> +{
> +    M41t80State *s = M41T80(i2c);
> +    struct tm now;
> +    qemu_timeval tv;
> +
> +    if (s->addr < 0) {
> +        s->addr = 0;
> +    }
> +    if (s->addr >= 1 && s->addr <= 7) {
> +        qemu_get_timedate(&now, -1);
> +    }
> +    switch (s->addr++) {
> +    case 0:
> +        qemu_gettimeofday(&tv);
> +        return to_bcd(tv.tv_usec / 10000);
> +    case 1:
> +        return to_bcd(now.tm_sec);
> +    case 2:
> +        return to_bcd(now.tm_min);
> +    case 3:
> +        return to_bcd(now.tm_hour);
> +    case 4:
> +        return to_bcd(now.tm_wday);
> +    case 5:
> +        return to_bcd(now.tm_mday);
> +    case 6:
> +        return to_bcd(now.tm_mon + 1);
> +    case 7:
> +        return to_bcd(now.tm_year % 100);
> +    case 8 ... 19:
> +        qemu_log_mask(LOG_UNIMP, "%s: unimplemented register: %d\n",
> +                      __func__, s->addr - 1);
> +        return 0;
> +    default:
> +        qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid register: %d\n",
> +                      __func__, s->addr - 1);
> +        return 0;
> +    }
> +}
> +
> +static int m41t80_event(I2CSlave *i2c, enum i2c_event event)
> +{
> +    M41t80State *s = M41T80(i2c);
> +
> +    if (event == I2C_START_SEND) {
> +        s->addr = -1;
> +    }
> +    return 0;
> +}
> +
> +static void m41t80_class_init(ObjectClass *klass, void *data)
> +{
> +    DeviceClass *dc = DEVICE_CLASS(klass);
> +    I2CSlaveClass *sc = I2C_SLAVE_CLASS(klass);
> +
> +    dc->realize = m41t80_realize;
> +    sc->send = m41t80_send;
> +    sc->recv = m41t80_recv;
> +    sc->event = m41t80_event;
> +}
> +
> +static const TypeInfo m41t80_info = {
> +    .name          = TYPE_M41T80,
> +    .parent        = TYPE_I2C_SLAVE,
> +    .instance_size = sizeof(M41t80State),
> +    .class_init    = m41t80_class_init,
> +};
> +
> +static void m41t80_register_types(void)
> +{
> +    type_register_static(&m41t80_info);
> +}
> +
> +type_init(m41t80_register_types)

Patch

diff --git a/MAINTAINERS b/MAINTAINERS
index 8a94517..74ae589 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -829,6 +829,7 @@  M: BALATON Zoltan <balaton@eik.bme.hu>
 L: qemu-ppc@nongnu.org
 S: Maintained
 F: hw/ide/sii3112.c
+F: hw/timer/m41t80.c
 
 SH4 Machines
 ------------
diff --git a/default-configs/ppc-softmmu.mak b/default-configs/ppc-softmmu.mak
index 7d0dc2f..9fbaadc 100644
--- a/default-configs/ppc-softmmu.mak
+++ b/default-configs/ppc-softmmu.mak
@@ -27,6 +27,7 @@  CONFIG_SM501=y
 CONFIG_IDE_SII3112=y
 CONFIG_I2C=y
 CONFIG_BITBANG_I2C=y
+CONFIG_M41T80=y
 
 # For Macs
 CONFIG_MAC=y
diff --git a/hw/timer/Makefile.objs b/hw/timer/Makefile.objs
index 8b27a4b..e16b2b9 100644
--- a/hw/timer/Makefile.objs
+++ b/hw/timer/Makefile.objs
@@ -6,6 +6,7 @@  common-obj-$(CONFIG_CADENCE) += cadence_ttc.o
 common-obj-$(CONFIG_DS1338) += ds1338.o
 common-obj-$(CONFIG_HPET) += hpet.o
 common-obj-$(CONFIG_I8254) += i8254_common.o i8254.o
+common-obj-$(CONFIG_M41T80) += m41t80.o
 common-obj-$(CONFIG_M48T59) += m48t59.o
 ifeq ($(CONFIG_ISA_BUS),y)
 common-obj-$(CONFIG_M48T59) += m48t59-isa.o
diff --git a/hw/timer/m41t80.c b/hw/timer/m41t80.c
new file mode 100644
index 0000000..734d7d9
--- /dev/null
+++ b/hw/timer/m41t80.c
@@ -0,0 +1,117 @@ 
+/*
+ * M41T80 serial rtc emulation
+ *
+ * Copyright (c) 2018 BALATON Zoltan
+ *
+ * This work is licensed under the GNU GPL license version 2 or later.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qemu/log.h"
+#include "qemu/timer.h"
+#include "qemu/bcd.h"
+#include "hw/i2c/i2c.h"
+
+#define TYPE_M41T80 "m41t80"
+#define M41T80(obj) OBJECT_CHECK(M41t80State, (obj), TYPE_M41T80)
+
+typedef struct M41t80State {
+    I2CSlave parent_obj;
+    int8_t addr;
+} M41t80State;
+
+static void m41t80_realize(DeviceState *dev, Error **errp)
+{
+    M41t80State *s = M41T80(dev);
+
+    s->addr = -1;
+}
+
+static int m41t80_send(I2CSlave *i2c, uint8_t data)
+{
+    M41t80State *s = M41T80(i2c);
+
+    if (s->addr < 0) {
+        s->addr = data;
+    } else {
+        s->addr++;
+    }
+    return 0;
+}
+
+static int m41t80_recv(I2CSlave *i2c)
+{
+    M41t80State *s = M41T80(i2c);
+    struct tm now;
+    qemu_timeval tv;
+
+    if (s->addr < 0) {
+        s->addr = 0;
+    }
+    if (s->addr >= 1 && s->addr <= 7) {
+        qemu_get_timedate(&now, -1);
+    }
+    switch (s->addr++) {
+    case 0:
+        qemu_gettimeofday(&tv);
+        return to_bcd(tv.tv_usec / 10000);
+    case 1:
+        return to_bcd(now.tm_sec);
+    case 2:
+        return to_bcd(now.tm_min);
+    case 3:
+        return to_bcd(now.tm_hour);
+    case 4:
+        return to_bcd(now.tm_wday);
+    case 5:
+        return to_bcd(now.tm_mday);
+    case 6:
+        return to_bcd(now.tm_mon + 1);
+    case 7:
+        return to_bcd(now.tm_year % 100);
+    case 8 ... 19:
+        qemu_log_mask(LOG_UNIMP, "%s: unimplemented register: %d\n",
+                      __func__, s->addr - 1);
+        return 0;
+    default:
+        qemu_log_mask(LOG_GUEST_ERROR, "%s: invalid register: %d\n",
+                      __func__, s->addr - 1);
+        return 0;
+    }
+}
+
+static int m41t80_event(I2CSlave *i2c, enum i2c_event event)
+{
+    M41t80State *s = M41T80(i2c);
+
+    if (event == I2C_START_SEND) {
+        s->addr = -1;
+    }
+    return 0;
+}
+
+static void m41t80_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    I2CSlaveClass *sc = I2C_SLAVE_CLASS(klass);
+
+    dc->realize = m41t80_realize;
+    sc->send = m41t80_send;
+    sc->recv = m41t80_recv;
+    sc->event = m41t80_event;
+}
+
+static const TypeInfo m41t80_info = {
+    .name          = TYPE_M41T80,
+    .parent        = TYPE_I2C_SLAVE,
+    .instance_size = sizeof(M41t80State),
+    .class_init    = m41t80_class_init,
+};
+
+static void m41t80_register_types(void)
+{
+    type_register_static(&m41t80_info);
+}
+
+type_init(m41t80_register_types)