Re: [PATCH v8 1/3] arm: npcm: add basic support for Nuvoton BMCs

From: Brendan Higgins
Date: Thu Dec 07 2017 - 15:37:29 EST

Any update on this?

On Fri, Nov 17, 2017 at 11:07 AM, Brendan Higgins
<brendanhiggins@xxxxxxxxxx> wrote:
> Adds basic support for the Nuvoton NPCM750 BMC.
>
> Signed-off-by: Brendan Higgins <brendanhiggins@xxxxxxxxxx>
> Reviewed-by: Tomer Maimon <tmaimon77@xxxxxxxxx>
> Reviewed-by: Avi Fishman <avifishman70@xxxxxxxxx>
> Tested-by: Tomer Maimon <tmaimon77@xxxxxxxxx>
> Tested-by: Avi Fishman <avifishman70@xxxxxxxxx>
> ---
> Changes since v7:
> - Fixed useless parameter in print statement
> - Added/cleaned up some comments
> - Fixed typo in DT_MACHINE_START
> - Got rid of L2C aux value
> - Dropped unnecessary memory barriers
> - Renamed CPU_NPCM750 to ARCH_NPCM750
> - Fixed some other minor issues
> ---
> arch/arm/Kconfig | 2 ++
> arch/arm/Makefile | 1 +
> arch/arm/mach-npcm/Kconfig | 48 +++++++++++++++++++++++++
> arch/arm/mach-npcm/Makefile | 3 ++
> arch/arm/mach-npcm/headsmp.S | 21 +++++++++++
> arch/arm/mach-npcm/npcm7xx.c | 25 +++++++++++++
> arch/arm/mach-npcm/platsmp.c | 85 ++++++++++++++++++++++++++++++++++++++++++++
> 7 files changed, 185 insertions(+)
> create mode 100644 arch/arm/mach-npcm/Kconfig
> create mode 100644 arch/arm/mach-npcm/Makefile
> create mode 100644 arch/arm/mach-npcm/headsmp.S
> create mode 100644 arch/arm/mach-npcm/npcm7xx.c
> create mode 100644 arch/arm/mach-npcm/platsmp.c
>
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index 61a0cb15067e..05543f1cfbde 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -782,6 +782,8 @@ source "arch/arm/mach-netx/Kconfig"
>
> source "arch/arm/mach-nomadik/Kconfig"
>
> +source "arch/arm/mach-npcm/Kconfig"
> +
> source "arch/arm/mach-nspire/Kconfig"
>
> source "arch/arm/plat-omap/Kconfig"
> diff --git a/arch/arm/Makefile b/arch/arm/Makefile
> index 47d3a1ab08d2..60ca50c7d762 100644
> --- a/arch/arm/Makefile
> +++ b/arch/arm/Makefile
> @@ -191,6 +191,7 @@ machine-$(CONFIG_ARCH_MEDIATEK) += mediatek
> machine-$(CONFIG_ARCH_MXS) += mxs
> machine-$(CONFIG_ARCH_NETX) += netx
> machine-$(CONFIG_ARCH_NOMADIK) += nomadik
> +machine-$(CONFIG_ARCH_NPCM) += npcm
> machine-$(CONFIG_ARCH_NSPIRE) += nspire
> machine-$(CONFIG_ARCH_OXNAS) += oxnas
> machine-$(CONFIG_ARCH_OMAP1) += omap1
> diff --git a/arch/arm/mach-npcm/Kconfig b/arch/arm/mach-npcm/Kconfig
> new file mode 100644
> index 000000000000..6ff9df2636be
> --- /dev/null
> +++ b/arch/arm/mach-npcm/Kconfig
> @@ -0,0 +1,48 @@
> +menuconfig ARCH_NPCM
> + bool "Nuvoton NPCM Architecture"
> + select ARCH_REQUIRE_GPIOLIB
> + select USE_OF
> + select PINCTRL
> + select PINCTRL_NPCM7XX
> +
> +if ARCH_NPCM
> +
> +comment "NPCM7XX CPU type"
> +
> +config ARCH_NPCM750
> + depends on ARCH_NPCM && ARCH_MULTI_V7
> + bool "Support for NPCM750 BMC CPU (Poleg)"
> + select CACHE_L2X0
> + select CPU_V7
> + select ARM_GIC
> + select HAVE_SMP
> + select SMP
> + select SMP_ON_UP
> + select HAVE_ARM_SCU
> + select HAVE_ARM_TWD if SMP
> + select ARM_ERRATA_720789
> + select ARM_ERRATA_754322
> + select ARM_ERRATA_764369
> + select ARM_ERRATA_794072
> + select PL310_ERRATA_588369
> + select PL310_ERRATA_727915
> + select USB_EHCI_ROOT_HUB_TT
> + select USB_ARCH_HAS_HCD
> + select USB_ARCH_HAS_EHCI
> + select USB_EHCI_HCD
> + select USB_ARCH_HAS_OHCI
> + select USB_OHCI_HCD
> + select USB
> + select FIQ
> + select CPU_USE_DOMAINS
> + select GENERIC_CLOCKEVENTS
> + select CLKDEV_LOOKUP
> + select COMMON_CLK if OF
> + select NPCM750_TIMER
> + select MFD_SYSCON
> + help
> + Support for NPCM750 BMC CPU (Poleg).
> +
> + Nuvoton NPCM750 BMC based on the Cortex A9.
> +
> +endif
> diff --git a/arch/arm/mach-npcm/Makefile b/arch/arm/mach-npcm/Makefile
> new file mode 100644
> index 000000000000..c7a1316d27c1
> --- /dev/null
> +++ b/arch/arm/mach-npcm/Makefile
> @@ -0,0 +1,3 @@
> +AFLAGS_headsmp.o += -march=armv7-a
> +
> +obj-$(CONFIG_ARCH_NPCM750) += npcm7xx.o platsmp.o headsmp.o
> diff --git a/arch/arm/mach-npcm/headsmp.S b/arch/arm/mach-npcm/headsmp.S
> new file mode 100644
> index 000000000000..2d0d8880634b
> --- /dev/null
> +++ b/arch/arm/mach-npcm/headsmp.S
> @@ -0,0 +1,21 @@
> +/*
> + * Copyright 2017 Google, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/linkage.h>
> +#include <linux/init.h>
> +#include <asm/assembler.h>
> +
> +/*
> + * The boot ROM does not start secondary CPUs in SVC mode, so we need to do that
> + * here.
> + */
> +ENTRY(npcm7xx_secondary_startup)
> + safe_svcmode_maskall r0
> +
> + b secondary_startup
> +ENDPROC(npcm7xx_secondary_startup)
> diff --git a/arch/arm/mach-npcm/npcm7xx.c b/arch/arm/mach-npcm/npcm7xx.c
> new file mode 100644
> index 000000000000..500bdd0a9ebb
> --- /dev/null
> +++ b/arch/arm/mach-npcm/npcm7xx.c
> @@ -0,0 +1,25 @@
> +/*
> + * Copyright (c) 2017 Nuvoton Technology corporation.
> + * Copyright 2017 Google, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <linux/kernel.h>
> +#include <linux/types.h>
> +#include <asm/mach/arch.h>
> +#include <asm/mach-types.h>
> +#include <asm/mach/map.h>
> +#include <asm/hardware/cache-l2x0.h>
> +
> +static const char *const npcm7xx_dt_match[] = {
> + "nuvoton,npcm750",
> + NULL
> +};
> +
> +DT_MACHINE_START(NPCM7XX_DT, "NPCM7XX Chip family")
> + .atag_offset = 0x100,
> + .dt_compat = npcm7xx_dt_match,
> +MACHINE_END
> diff --git a/arch/arm/mach-npcm/platsmp.c b/arch/arm/mach-npcm/platsmp.c
> new file mode 100644
> index 000000000000..959af7bd741f
> --- /dev/null
> +++ b/arch/arm/mach-npcm/platsmp.c
> @@ -0,0 +1,85 @@
> +/*
> + * Copyright 2017 Google, Inc.
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#define pr_fmt(fmt) "nuvoton,npcm7xx-smp: " fmt
> +
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/smp.h>
> +#include <linux/io.h>
> +#include <linux/of.h>
> +#include <linux/of_device.h>
> +#include <linux/of_platform.h>
> +#include <linux/of_address.h>
> +#include <asm/cacheflush.h>
> +#include <asm/smp.h>
> +#include <asm/smp_plat.h>
> +#include <asm/smp_scu.h>
> +
> +#define NPCM7XX_SCRPAD_REG 0x13c
> +
> +extern void npcm7xx_secondary_startup(void);
> +
> +static int npcm7xx_smp_boot_secondary(unsigned int cpu,
> + struct task_struct *idle)
> +{
> + struct device_node *gcr_np;
> + void __iomem *gcr_base;
> + int ret = 0;
> +
> + gcr_np = of_find_compatible_node(NULL, NULL, "nuvoton,npcm750-gcr");
> + if (!gcr_np) {
> + pr_err("no gcr device node\n");
> + ret = -ENODEV;
> + goto out;
> + }
> + gcr_base = of_iomap(gcr_np, 0);
> + if (!gcr_base) {
> + pr_err("could not iomap gcr");
> + ret = -ENOMEM;
> + goto out;
> + }
> +
> + /* give boot ROM kernel start address. */
> + iowrite32(__pa_symbol(npcm7xx_secondary_startup), gcr_base +
> + NPCM7XX_SCRPAD_REG);
> + /* make sure the previous write is seen by all observers. */
> + dsb_sev();
> +
> + iounmap(gcr_base);
> +out:
> + return ret;
> +}
> +
> +static void __init npcm7xx_smp_prepare_cpus(unsigned int max_cpus)
> +{
> + struct device_node *scu_np;
> + void __iomem *scu_base;
> +
> + scu_np = of_find_compatible_node(NULL, NULL, "arm,cortex-a9-scu");
> + if (!scu_np) {
> + pr_err("no scu device node\n");
> + return;
> + }
> + scu_base = of_iomap(scu_np, 0);
> + if (!scu_base) {
> + pr_err("could not iomap scu");
> + return;
> + }
> +
> + scu_enable(scu_base);
> +
> + iounmap(scu_base);
> +}
> +
> +static struct smp_operations npcm7xx_smp_ops __initdata = {
> + .smp_prepare_cpus = npcm7xx_smp_prepare_cpus,
> + .smp_boot_secondary = npcm7xx_smp_boot_secondary,
> +};
> +
> +CPU_METHOD_OF_DECLARE(npcm7xx_smp, "nuvoton,npcm7xx-smp", &npcm7xx_smp_ops);
> --
> 2.15.0.448.gf294e3d99a-goog
>