Re: [PATCH v5 05/11] hw/arm: Add two NPCM7xx-based machines

["Philippe Mathieu-Daudé" <f4bug@amsat.org>]

On 7/9/20 7:57 AM, Philippe Mathieu-Daudé wrote:
> On 7/9/20 2:36 AM, Havard Skinnemoen wrote:
>> This adds two new machines, both supported by OpenBMC:
>>
>>   - npcm750-evb: Nuvoton NPCM750 Evaluation Board.
>>   - quanta-gsj: A board with a NPCM730 chip.
>>
>> They rely on the NPCM7xx SoC device to do the heavy lifting. They are
>> almost completely identical at the moment, apart from the SoC type,
>> which currently only changes the reset contents of one register
>> (GCR.MDLR), but they might grow apart a bit more as more functionality
>> is added.
>>
>> Both machines can boot the Linux kernel into /bin/sh.
>>
>> Reviewed-by: Tyrone Ting <kfting@nuvoton.com>
>> Reviewed-by: Joel Stanley <joel@jms.id.au>
>> Reviewed-by: Cédric Le Goater <clg@kaod.org>
>> Signed-off-by: Havard Skinnemoen <hskinnemoen@google.com>
>> ---
>>  default-configs/arm-softmmu.mak |   1 +
>>  include/hw/arm/npcm7xx.h        |  19 ++++
>>  hw/arm/npcm7xx_boards.c         | 156 ++++++++++++++++++++++++++++++++
>>  hw/arm/Makefile.objs            |   2 +-
>>  4 files changed, 177 insertions(+), 1 deletion(-)
>>  create mode 100644 hw/arm/npcm7xx_boards.c
>>
>> diff --git a/default-configs/arm-softmmu.mak b/default-configs/arm-softmmu.mak
>> index 8fc09a4a51..9a94ebd0be 100644
>> --- a/default-configs/arm-softmmu.mak
>> +++ b/default-configs/arm-softmmu.mak
>> @@ -27,6 +27,7 @@ CONFIG_GUMSTIX=y
>>  CONFIG_SPITZ=y
>>  CONFIG_TOSA=y
>>  CONFIG_Z2=y
>> +CONFIG_NPCM7XX=y
>>  CONFIG_COLLIE=y
>>  CONFIG_ASPEED_SOC=y
>>  CONFIG_NETDUINO2=y
>> diff --git a/include/hw/arm/npcm7xx.h b/include/hw/arm/npcm7xx.h
>> index 95d9224f59..b8b76bc07b 100644
>> --- a/include/hw/arm/npcm7xx.h
>> +++ b/include/hw/arm/npcm7xx.h
>> @@ -35,6 +35,25 @@
>>  #define NPCM7XX_SMP_BOOTREG_ADDR        (0xf080013c)  /* GCR.SCRPAD */
>>  #define NPCM7XX_GIC_CPU_IF_ADDR         (0xf03fe100)  /* GIC within A9 */
>>  
>> +typedef struct NPCM7xxMachine {
>> +    MachineState        parent;
>> +} NPCM7xxMachine;
>> +
>> +#define TYPE_NPCM7XX_MACHINE MACHINE_TYPE_NAME("npcm7xx")
>> +#define NPCM7XX_MACHINE(obj)                                            \
>> +    OBJECT_CHECK(NPCM7xxMachine, (obj), TYPE_NPCM7XX_MACHINE)
>> +
>> +typedef struct NPCM7xxMachineClass {
>> +    MachineClass        parent;
>> +
>> +    const char          *soc_type;
>> +} NPCM7xxMachineClass;
>> +
>> +#define NPCM7XX_MACHINE_CLASS(klass)                                    \
>> +    OBJECT_CLASS_CHECK(NPCM7xxMachineClass, (klass), TYPE_NPCM7XX_MACHINE)
>> +#define NPCM7XX_MACHINE_GET_CLASS(obj)                                  \
>> +    OBJECT_GET_CLASS(NPCM7xxMachineClass, (obj), TYPE_NPCM7XX_MACHINE)
>> +
>>  typedef struct NPCM7xxState {
>>      DeviceState         parent;
>>  
>> diff --git a/hw/arm/npcm7xx_boards.c b/hw/arm/npcm7xx_boards.c
>> new file mode 100644
>> index 0000000000..d78d9f991b
>> --- /dev/null
>> +++ b/hw/arm/npcm7xx_boards.c
>> @@ -0,0 +1,156 @@
>> +/*
>> + * Machine definitions for boards featuring an NPCM7xx SoC.
>> + *
>> + * Copyright 2020 Google LLC
>> + *
>> + * This program is free software; you can redistribute it and/or modify it
>> + * under the terms of the GNU General Public License as published by the
>> + * Free Software Foundation; either version 2 of the License, or
>> + * (at your option) any later version.
>> + *
>> + * This program 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 General Public License
>> + * for more details.
>> + */
>> +
>> +#include "qemu/osdep.h"
>> +
>> +#include "hw/arm/boot.h"
>> +#include "hw/arm/npcm7xx.h"
>> +#include "hw/core/cpu.h"
>> +#include "qapi/error.h"
>> +#include "qemu/units.h"
>> +
>> +#define NPCM750_EVB_POWER_ON_STRAPS 0x00001ff7
>> +#define QUANTA_GSJ_POWER_ON_STRAPS 0x00001fff
>> +
>> +static struct arm_boot_info npcm7xx_binfo = {
>> +    .loader_start       = NPCM7XX_LOADER_START,
>> +    .smp_loader_start   = NPCM7XX_SMP_LOADER_START,
>> +    .smp_bootreg_addr   = NPCM7XX_SMP_BOOTREG_ADDR,
>> +    .gic_cpu_if_addr    = NPCM7XX_GIC_CPU_IF_ADDR,
>> +    .write_secondary_boot = npcm7xx_write_secondary_boot,
>> +    .board_id           = -1,
>> +};
>> +
>> +static void npcm7xx_load_kernel(MachineState *machine, NPCM7xxState *soc)
>> +{
>> +    NPCM7xxClass *sc = NPCM7XX_GET_CLASS(soc);
>> +
>> +    npcm7xx_binfo.ram_size = machine->ram_size;
>> +    npcm7xx_binfo.nb_cpus = sc->num_cpus;
>> +
>> +    arm_load_kernel(&soc->cpu[0], machine, &npcm7xx_binfo);
>> +}
>> +
>> +static void npcm7xx_connect_dram(NPCM7xxState *soc, MemoryRegion *dram)
>> +{
> 
> You might need a check such:
> 
>     if (memory_region_size(dram) > NPCM7XX_DRAM_SZ) {
>         error_report("Invalid RAM size, maximum allowed is 2GB");
>         exit(1);
>     }
> 
> Or add a npcm7xx_verify_dram_size(MachineState *machine) and use
> machine->ram_size.
> 
> Hardware don't really care you use more than 2GB, the memory
> above 2GB is not addressable by the SoC.
> 
> Maybe the check belongs to npcm7xx_gcr_realize() instead?
> 
>     if (dram_size > 2 * GiB) {
>         warn_report(...)
>     }
>     if (dram_size >= 2 * GiB) {
>         s->reset_intcr3 |= 4 << 8;
>     ...
> 
> If the GCR is generic to a family of Nuvoton chipsets and expected to
> also work when using ARMv8-A cores (able to address >4GB), then the
> check belongs to npcm7xx_realize().
> 
> With this addressed:
> Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
> 
>> +    memory_region_add_subregion(get_system_memory(), NPCM7XX_DRAM_BA, dram);
>> +
>> +    object_property_set_link(OBJECT(soc), OBJECT(dram), "dram-mr",
>> +                             &error_abort);
>> +}
>> +
>> +static NPCM7xxState *npcm7xx_create_soc(MachineState *machine,
>> +                                        uint32_t hw_straps)
>> +{
>> +    NPCM7xxMachineClass *nmc = NPCM7XX_MACHINE_GET_CLASS(machine);
>> +    Object *obj;
>> +

Oh I forgot, you also need:

        if (strcmp(machine->cpu_type, mc->default_cpu_type) != 0) {
            error_report("This board can only be used with CPU %s",
                         mc->default_cpu_type);
            exit(1);
        }

With ...

>> +    obj = object_new_with_props(nmc->soc_type, OBJECT(machine), "soc",
>> +                                &error_abort, NULL);
>> +    object_property_set_uint(obj, hw_straps, "power-on-straps", &error_abort);
>> +
>> +    return NPCM7XX(obj);
>> +}
>> +
>> +static void npcm750_evb_init(MachineState *machine)
>> +{
>> +    NPCM7xxState *soc;
>> +
>> +    soc = npcm7xx_create_soc(machine, NPCM750_EVB_POWER_ON_STRAPS);
>> +    npcm7xx_connect_dram(soc, machine->ram);
>> +    qdev_realize(DEVICE(soc), NULL, &error_abort);
>> +
>> +    npcm7xx_load_kernel(machine, soc);
>> +}
>> +
>> +static void quanta_gsj_init(MachineState *machine)
>> +{
>> +    NPCM7xxState *soc;
>> +
>> +    soc = npcm7xx_create_soc(machine, QUANTA_GSJ_POWER_ON_STRAPS);
>> +    npcm7xx_connect_dram(soc, machine->ram);
>> +    qdev_realize(DEVICE(soc), NULL, &error_abort);
>> +
>> +    npcm7xx_load_kernel(machine, soc);
>> +}
>> +
>> +static void npcm7xx_set_soc_type(NPCM7xxMachineClass *nmc, const char *type)
>> +{
>> +    NPCM7xxClass *sc = NPCM7XX_CLASS(object_class_by_name(type));
>> +    MachineClass *mc = MACHINE_CLASS(nmc);
>> +
>> +    nmc->soc_type = type;
>> +    mc->default_cpus = mc->min_cpus = mc->max_cpus = sc->num_cpus;
>> +}
>> +
>> +static void npcm7xx_machine_class_init(ObjectClass *oc, void *data)
>> +{
>> +    MachineClass *mc = MACHINE_CLASS(oc);
>> +
>> +    mc->no_floppy       = 1;
>> +    mc->no_cdrom        = 1;
>> +    mc->no_parallel     = 1;
>> +    mc->default_ram_id  = "ram";

... this here:

        mc->default_cpu_type = ARM_CPU_TYPE_NAME("cortex-a9");

>> +}
>> +
>> +/*
>> + * Schematics:
>> + * https://github.com/Nuvoton-Israel/nuvoton-info/blob/master/npcm7xx-poleg/evaluation-board/board_deliverables/NPCM750x_EB_ver.A1.1_COMPLETE.pdf
>> + */
>> +static void npcm750_evb_machine_class_init(ObjectClass *oc, void *data)
>> +{
>> +    NPCM7xxMachineClass *nmc = NPCM7XX_MACHINE_CLASS(oc);
>> +    MachineClass *mc = MACHINE_CLASS(oc);
>> +
>> +    npcm7xx_set_soc_type(nmc, TYPE_NPCM750);
>> +
>> +    mc->desc            = "Nuvoton NPCM750 Evaluation Board (Cortex A9)";
>> +    mc->init            = npcm750_evb_init;
> 
> Either use 'var = value' or pad and align the '=' :)
> 
>> +    mc->default_ram_size = 512 * MiB;
>> +};
>> +
>> +static void gsj_machine_class_init(ObjectClass *oc, void *data)
>> +{
>> +    NPCM7xxMachineClass *nmc = NPCM7XX_MACHINE_CLASS(oc);
>> +    MachineClass *mc = MACHINE_CLASS(oc);
>> +
>> +    npcm7xx_set_soc_type(nmc, TYPE_NPCM730);
>> +
>> +    mc->desc            = "Quanta GSJ (Cortex A9)";
>> +    mc->init            = quanta_gsj_init;
>> +    mc->default_ram_size = 512 * MiB;
>> +};
>> +
>> +static const TypeInfo npcm7xx_machine_types[] = {
>> +    {
>> +        .name           = TYPE_NPCM7XX_MACHINE,
>> +        .parent         = TYPE_MACHINE,
>> +        .instance_size  = sizeof(NPCM7xxMachine),
>> +        .class_size     = sizeof(NPCM7xxMachineClass),
>> +        .class_init     = npcm7xx_machine_class_init,
>> +        .abstract       = true,
>> +    }, {
>> +        .name           = MACHINE_TYPE_NAME("npcm750-evb"),
>> +        .parent         = TYPE_NPCM7XX_MACHINE,
>> +        .class_init     = npcm750_evb_machine_class_init,
>> +    }, {
>> +        .name           = MACHINE_TYPE_NAME("quanta-gsj"),
>> +        .parent         = TYPE_NPCM7XX_MACHINE,
>> +        .class_init     = gsj_machine_class_init,
>> +    },
>> +};
>> +
>> +DEFINE_TYPES(npcm7xx_machine_types)
>> diff --git a/hw/arm/Makefile.objs b/hw/arm/Makefile.objs
>> index 13d163a599..c333548ce1 100644
>> --- a/hw/arm/Makefile.objs
>> +++ b/hw/arm/Makefile.objs
>> @@ -41,7 +41,7 @@ obj-$(CONFIG_STM32F205_SOC) += stm32f205_soc.o
>>  obj-$(CONFIG_STM32F405_SOC) += stm32f405_soc.o
>>  obj-$(CONFIG_XLNX_ZYNQMP_ARM) += xlnx-zynqmp.o xlnx-zcu102.o
>>  obj-$(CONFIG_XLNX_VERSAL) += xlnx-versal.o xlnx-versal-virt.o
>> -obj-$(CONFIG_NPCM7XX) += npcm7xx.o
>> +obj-$(CONFIG_NPCM7XX) += npcm7xx.o npcm7xx_boards.o
>>  obj-$(CONFIG_FSL_IMX25) += fsl-imx25.o imx25_pdk.o
>>  obj-$(CONFIG_FSL_IMX31) += fsl-imx31.o kzm.o
>>  obj-$(CONFIG_FSL_IMX6) += fsl-imx6.o
>>
>