[PATCH for-6.2 19/25] hw/arm/msf2: Use Clock input to MSF2_SOC instead of m3clk property

Peter Maydell posted 25 patches 4 years, 6 months ago
Maintainers: Alistair Francis <alistair@alistair23.me>, Peter Maydell <peter.maydell@linaro.org>, Alexandre Iooss <erdnaxe@crans.org>, Subbaraya Sundeep <sundeep.lkml@gmail.com>, Luc Michel <luc@lmichel.fr>, Damien Hedde <damien.hedde@greensocs.com>, Joel Stanley <joel@jms.id.au>
[PATCH for-6.2 19/25] hw/arm/msf2: Use Clock input to MSF2_SOC instead of m3clk property
Posted by Peter Maydell 4 years, 6 months ago
Instead of passing the MSF2 SoC an integer property specifying the
CPU clock rate, pass it a Clock instead.  This lets us wire that
clock up to the armv7m object.

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
---
 include/hw/arm/msf2-soc.h |  3 ++-
 hw/arm/msf2-soc.c         | 28 +++++++++++++++++-----------
 hw/arm/msf2-som.c         |  7 ++++++-
 3 files changed, 25 insertions(+), 13 deletions(-)

diff --git a/include/hw/arm/msf2-soc.h b/include/hw/arm/msf2-soc.h
index 38e10ce20aa..01f904cec47 100644
--- a/include/hw/arm/msf2-soc.h
+++ b/include/hw/arm/msf2-soc.h
@@ -30,6 +30,7 @@
 #include "hw/misc/msf2-sysreg.h"
 #include "hw/ssi/mss-spi.h"
 #include "hw/net/msf2-emac.h"
+#include "hw/clock.h"
 #include "qom/object.h"
 
 #define TYPE_MSF2_SOC     "msf2-soc"
@@ -57,7 +58,7 @@ struct MSF2State {
     uint64_t envm_size;
     uint64_t esram_size;
 
-    uint32_t m3clk;
+    Clock *m3clk;
     uint8_t apb0div;
     uint8_t apb1div;
 
diff --git a/hw/arm/msf2-soc.c b/hw/arm/msf2-soc.c
index f36788054b3..0a1e594aee6 100644
--- a/hw/arm/msf2-soc.c
+++ b/hw/arm/msf2-soc.c
@@ -29,6 +29,7 @@
 #include "hw/char/serial.h"
 #include "hw/arm/msf2-soc.h"
 #include "hw/misc/unimp.h"
+#include "hw/qdev-clock.h"
 #include "sysemu/sysemu.h"
 
 #define MSF2_TIMER_BASE       0x40004000
@@ -73,6 +74,8 @@ static void m2sxxx_soc_initfn(Object *obj)
     }
 
     object_initialize_child(obj, "emac", &s->emac, TYPE_MSS_EMAC);
+
+    s->m3clk = qdev_init_clock_in(DEVICE(obj), "m3clk", NULL, NULL, 0);
 }
 
 static void m2sxxx_soc_realize(DeviceState *dev_soc, Error **errp)
@@ -84,6 +87,11 @@ static void m2sxxx_soc_realize(DeviceState *dev_soc, Error **errp)
 
     MemoryRegion *system_memory = get_system_memory();
 
+    if (!clock_has_source(s->m3clk)) {
+        error_setg(errp, "m3clk must be wired up by the board code");
+        return;
+    }
+
     memory_region_init_rom(&s->nvm, OBJECT(dev_soc), "MSF2.eNVM", s->envm_size,
                            &error_fatal);
     /*
@@ -106,19 +114,14 @@ static void m2sxxx_soc_realize(DeviceState *dev_soc, Error **errp)
     qdev_prop_set_uint32(armv7m, "num-irq", 81);
     qdev_prop_set_string(armv7m, "cpu-type", s->cpu_type);
     qdev_prop_set_bit(armv7m, "enable-bitband", true);
+    qdev_connect_clock_in(armv7m, "cpuclk", s->m3clk);
     object_property_set_link(OBJECT(&s->armv7m), "memory",
                              OBJECT(get_system_memory()), &error_abort);
     if (!sysbus_realize(SYS_BUS_DEVICE(&s->armv7m), errp)) {
         return;
     }
 
-    if (!s->m3clk) {
-        error_setg(errp, "Invalid m3clk value");
-        error_append_hint(errp, "m3clk can not be zero\n");
-        return;
-    }
-
-    system_clock_scale = NANOSECONDS_PER_SECOND / s->m3clk;
+    system_clock_scale = clock_ticks_to_ns(s->m3clk, 1);
 
     for (i = 0; i < MSF2_NUM_UARTS; i++) {
         if (serial_hd(i)) {
@@ -129,8 +132,13 @@ static void m2sxxx_soc_realize(DeviceState *dev_soc, Error **errp)
     }
 
     dev = DEVICE(&s->timer);
-    /* APB0 clock is the timer input clock */
-    qdev_prop_set_uint32(dev, "clock-frequency", s->m3clk / s->apb0div);
+    /*
+     * APB0 clock is the timer input clock.
+     * TODO: ideally the MSF2 timer device should use a Clock rather than a
+     * clock-frequency integer property.
+     */
+    qdev_prop_set_uint32(dev, "clock-frequency",
+                         clock_get_hz(s->m3clk) / s->apb0div);
     if (!sysbus_realize(SYS_BUS_DEVICE(&s->timer), errp)) {
         return;
     }
@@ -207,8 +215,6 @@ static Property m2sxxx_soc_properties[] = {
     DEFINE_PROP_UINT64("eNVM-size", MSF2State, envm_size, MSF2_ENVM_MAX_SIZE),
     DEFINE_PROP_UINT64("eSRAM-size", MSF2State, esram_size,
                         MSF2_ESRAM_MAX_SIZE),
-    /* Libero GUI shows 100Mhz as default for clocks */
-    DEFINE_PROP_UINT32("m3clk", MSF2State, m3clk, 100 * 1000000),
     /* default divisors in Libero GUI */
     DEFINE_PROP_UINT8("apb0div", MSF2State, apb0div, 2),
     DEFINE_PROP_UINT8("apb1div", MSF2State, apb1div, 2),
diff --git a/hw/arm/msf2-som.c b/hw/arm/msf2-som.c
index 343ec977c07..396e8b99138 100644
--- a/hw/arm/msf2-som.c
+++ b/hw/arm/msf2-som.c
@@ -29,6 +29,7 @@
 #include "hw/boards.h"
 #include "hw/qdev-properties.h"
 #include "hw/arm/boot.h"
+#include "hw/qdev-clock.h"
 #include "exec/address-spaces.h"
 #include "hw/arm/msf2-soc.h"
 
@@ -49,6 +50,7 @@ static void emcraft_sf2_s2s010_init(MachineState *machine)
     BusState *spi_bus;
     MemoryRegion *sysmem = get_system_memory();
     MemoryRegion *ddr = g_new(MemoryRegion, 1);
+    Clock *m3clk;
 
     if (strcmp(machine->cpu_type, mc->default_cpu_type) != 0) {
         error_report("This board can only be used with CPU %s",
@@ -72,7 +74,10 @@ static void emcraft_sf2_s2s010_init(MachineState *machine)
      * in Libero. CPU clock is divided by APB0 and APB1 divisors for
      * peripherals. Emcraft's SoM kit comes with these settings by default.
      */
-    qdev_prop_set_uint32(dev, "m3clk", 142 * 1000000);
+    /* This clock doesn't need migration because it is fixed-frequency */
+    m3clk = clock_new(OBJECT(machine), "m3clk");
+    clock_set_hz(m3clk, 142 * 1000000);
+    qdev_connect_clock_in(dev, "m3clk", m3clk);
     qdev_prop_set_uint32(dev, "apb0div", 2);
     qdev_prop_set_uint32(dev, "apb1div", 2);
 
-- 
2.20.1


Re: [PATCH for-6.2 19/25] hw/arm/msf2: Use Clock input to MSF2_SOC instead of m3clk property
Posted by Alexandre IOOSS 4 years, 5 months ago
On 8/12/21 11:33 AM, Peter Maydell wrote:
> Instead of passing the MSF2 SoC an integer property specifying the
> CPU clock rate, pass it a Clock instead.  This lets us wire that
> clock up to the armv7m object.
> 
> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> ---
>   include/hw/arm/msf2-soc.h |  3 ++-
>   hw/arm/msf2-soc.c         | 28 +++++++++++++++++-----------
>   hw/arm/msf2-som.c         |  7 ++++++-
>   3 files changed, 25 insertions(+), 13 deletions(-)
> 
> diff --git a/include/hw/arm/msf2-soc.h b/include/hw/arm/msf2-soc.h
> index 38e10ce20aa..01f904cec47 100644
> --- a/include/hw/arm/msf2-soc.h
> +++ b/include/hw/arm/msf2-soc.h
> @@ -30,6 +30,7 @@
>   #include "hw/misc/msf2-sysreg.h"
>   #include "hw/ssi/mss-spi.h"
>   #include "hw/net/msf2-emac.h"
> +#include "hw/clock.h"
>   #include "qom/object.h"
>   
>   #define TYPE_MSF2_SOC     "msf2-soc"
> @@ -57,7 +58,7 @@ struct MSF2State {
>       uint64_t envm_size;
>       uint64_t esram_size;
>   
> -    uint32_t m3clk;
> +    Clock *m3clk;
>       uint8_t apb0div;
>       uint8_t apb1div;
>   
> diff --git a/hw/arm/msf2-soc.c b/hw/arm/msf2-soc.c
> index f36788054b3..0a1e594aee6 100644
> --- a/hw/arm/msf2-soc.c
> +++ b/hw/arm/msf2-soc.c
> @@ -29,6 +29,7 @@
>   #include "hw/char/serial.h"
>   #include "hw/arm/msf2-soc.h"
>   #include "hw/misc/unimp.h"
> +#include "hw/qdev-clock.h"
>   #include "sysemu/sysemu.h"
>   
>   #define MSF2_TIMER_BASE       0x40004000
> @@ -73,6 +74,8 @@ static void m2sxxx_soc_initfn(Object *obj)
>       }
>   
>       object_initialize_child(obj, "emac", &s->emac, TYPE_MSS_EMAC);
> +
> +    s->m3clk = qdev_init_clock_in(DEVICE(obj), "m3clk", NULL, NULL, 0);
>   }
>   
>   static void m2sxxx_soc_realize(DeviceState *dev_soc, Error **errp)
> @@ -84,6 +87,11 @@ static void m2sxxx_soc_realize(DeviceState *dev_soc, Error **errp)
>   
>       MemoryRegion *system_memory = get_system_memory();
>   
> +    if (!clock_has_source(s->m3clk)) {
> +        error_setg(errp, "m3clk must be wired up by the board code");
> +        return;
> +    }
> +
>       memory_region_init_rom(&s->nvm, OBJECT(dev_soc), "MSF2.eNVM", s->envm_size,
>                              &error_fatal);
>       /*
> @@ -106,19 +114,14 @@ static void m2sxxx_soc_realize(DeviceState *dev_soc, Error **errp)
>       qdev_prop_set_uint32(armv7m, "num-irq", 81);
>       qdev_prop_set_string(armv7m, "cpu-type", s->cpu_type);
>       qdev_prop_set_bit(armv7m, "enable-bitband", true);
> +    qdev_connect_clock_in(armv7m, "cpuclk", s->m3clk);
>       object_property_set_link(OBJECT(&s->armv7m), "memory",
>                                OBJECT(get_system_memory()), &error_abort);
>       if (!sysbus_realize(SYS_BUS_DEVICE(&s->armv7m), errp)) {
>           return;
>       }
>   
> -    if (!s->m3clk) {
> -        error_setg(errp, "Invalid m3clk value");
> -        error_append_hint(errp, "m3clk can not be zero\n");
> -        return;
> -    }
> -
> -    system_clock_scale = NANOSECONDS_PER_SECOND / s->m3clk;
> +    system_clock_scale = clock_ticks_to_ns(s->m3clk, 1);
>   
>       for (i = 0; i < MSF2_NUM_UARTS; i++) {
>           if (serial_hd(i)) {
> @@ -129,8 +132,13 @@ static void m2sxxx_soc_realize(DeviceState *dev_soc, Error **errp)
>       }
>   
>       dev = DEVICE(&s->timer);
> -    /* APB0 clock is the timer input clock */
> -    qdev_prop_set_uint32(dev, "clock-frequency", s->m3clk / s->apb0div);
> +    /*
> +     * APB0 clock is the timer input clock.
> +     * TODO: ideally the MSF2 timer device should use a Clock rather than a
> +     * clock-frequency integer property.
> +     */
> +    qdev_prop_set_uint32(dev, "clock-frequency",
> +                         clock_get_hz(s->m3clk) / s->apb0div);
>       if (!sysbus_realize(SYS_BUS_DEVICE(&s->timer), errp)) {
>           return;
>       }
> @@ -207,8 +215,6 @@ static Property m2sxxx_soc_properties[] = {
>       DEFINE_PROP_UINT64("eNVM-size", MSF2State, envm_size, MSF2_ENVM_MAX_SIZE),
>       DEFINE_PROP_UINT64("eSRAM-size", MSF2State, esram_size,
>                           MSF2_ESRAM_MAX_SIZE),
> -    /* Libero GUI shows 100Mhz as default for clocks */
> -    DEFINE_PROP_UINT32("m3clk", MSF2State, m3clk, 100 * 1000000),
>       /* default divisors in Libero GUI */
>       DEFINE_PROP_UINT8("apb0div", MSF2State, apb0div, 2),
>       DEFINE_PROP_UINT8("apb1div", MSF2State, apb1div, 2),
> diff --git a/hw/arm/msf2-som.c b/hw/arm/msf2-som.c
> index 343ec977c07..396e8b99138 100644
> --- a/hw/arm/msf2-som.c
> +++ b/hw/arm/msf2-som.c
> @@ -29,6 +29,7 @@
>   #include "hw/boards.h"
>   #include "hw/qdev-properties.h"
>   #include "hw/arm/boot.h"
> +#include "hw/qdev-clock.h"
>   #include "exec/address-spaces.h"
>   #include "hw/arm/msf2-soc.h"
>   
> @@ -49,6 +50,7 @@ static void emcraft_sf2_s2s010_init(MachineState *machine)
>       BusState *spi_bus;
>       MemoryRegion *sysmem = get_system_memory();
>       MemoryRegion *ddr = g_new(MemoryRegion, 1);
> +    Clock *m3clk;
>   
>       if (strcmp(machine->cpu_type, mc->default_cpu_type) != 0) {
>           error_report("This board can only be used with CPU %s",
> @@ -72,7 +74,10 @@ static void emcraft_sf2_s2s010_init(MachineState *machine)
>        * in Libero. CPU clock is divided by APB0 and APB1 divisors for
>        * peripherals. Emcraft's SoM kit comes with these settings by default.
>        */
> -    qdev_prop_set_uint32(dev, "m3clk", 142 * 1000000);
> +    /* This clock doesn't need migration because it is fixed-frequency */
> +    m3clk = clock_new(OBJECT(machine), "m3clk");
> +    clock_set_hz(m3clk, 142 * 1000000);

Maybe something could be added in the commit message to say that M3_CLK 
is changed from 100MHz to 142MHz. I do not know the SmartFusion2 but the 
clocking guide seems to agree with 142MHz:
https://www.microsemi.com/document-portal/doc_download/132012-ug0449-smartfusion2-and-igloo2-clocking-resources-user-guide

> +    qdev_connect_clock_in(dev, "m3clk", m3clk);
>       qdev_prop_set_uint32(dev, "apb0div", 2);
>       qdev_prop_set_uint32(dev, "apb1div", 2);
>   
> 

Reviewed-by: Alexandre Iooss <erdnaxe@crans.org>

Thanks,
-- Alexandre

Re: [PATCH for-6.2 19/25] hw/arm/msf2: Use Clock input to MSF2_SOC instead of m3clk property
Posted by Peter Maydell 4 years, 5 months ago
On Sat, 14 Aug 2021 at 10:20, Alexandre IOOSS <erdnaxe@crans.org> wrote:
>
>
> On 8/12/21 11:33 AM, Peter Maydell wrote:
> > Instead of passing the MSF2 SoC an integer property specifying the
> > CPU clock rate, pass it a Clock instead.  This lets us wire that
> > clock up to the armv7m object.
> >
> > Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

> > @@ -72,7 +74,10 @@ static void emcraft_sf2_s2s010_init(MachineState *machine)
> >        * in Libero. CPU clock is divided by APB0 and APB1 divisors for
> >        * peripherals. Emcraft's SoM kit comes with these settings by default.
> >        */
> > -    qdev_prop_set_uint32(dev, "m3clk", 142 * 1000000);
> > +    /* This clock doesn't need migration because it is fixed-frequency */
> > +    m3clk = clock_new(OBJECT(machine), "m3clk");
> > +    clock_set_hz(m3clk, 142 * 1000000);
>
> Maybe something could be added in the commit message to say that M3_CLK
> is changed from 100MHz to 142MHz.

I'm not sure what you mean here? This commit doesn't change the frequency:
we previously set the m3clk property to "142 * 1000000" and now we set the
clock's hz setting to the same thing.

The old m3clk property had a default value of 100 * 1000000, but nothing
ever used that because the only user of the device (this board code)
set the property explicitly to some value. With the new Clock-based
setup there is no default value at all, because the board code must
always connect a clock, and will set its frequency to whatever is
right for that board.

-- PMM

Re: [PATCH for-6.2 19/25] hw/arm/msf2: Use Clock input to MSF2_SOC instead of m3clk property
Posted by Alexandre IOOSS 4 years, 5 months ago
On 8/14/21 12:11 PM, Peter Maydell wrote:
> On Sat, 14 Aug 2021 at 10:20, Alexandre IOOSS <erdnaxe@crans.org> wrote:
>>
>>
>> On 8/12/21 11:33 AM, Peter Maydell wrote:
>>> Instead of passing the MSF2 SoC an integer property specifying the
>>> CPU clock rate, pass it a Clock instead.  This lets us wire that
>>> clock up to the armv7m object.
>>>
>>> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
> 
>>> @@ -72,7 +74,10 @@ static void emcraft_sf2_s2s010_init(MachineState *machine)
>>>         * in Libero. CPU clock is divided by APB0 and APB1 divisors for
>>>         * peripherals. Emcraft's SoM kit comes with these settings by default.
>>>         */
>>> -    qdev_prop_set_uint32(dev, "m3clk", 142 * 1000000);
>>> +    /* This clock doesn't need migration because it is fixed-frequency */
>>> +    m3clk = clock_new(OBJECT(machine), "m3clk");
>>> +    clock_set_hz(m3clk, 142 * 1000000);
>>
>> Maybe something could be added in the commit message to say that M3_CLK
>> is changed from 100MHz to 142MHz.
> 
> I'm not sure what you mean here? This commit doesn't change the frequency:
> we previously set the m3clk property to "142 * 1000000" and now we set the
> clock's hz setting to the same thing.

My bad, I did not realize the board was already setting the frequency to 
142MHz.

Thanks,
-- Alexandre