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arm: npcm: add basic support for Nuvoton BMCs

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Adds basic support for the Nuvoton NPCM750 BMC.

Signed-off-by: Brendan Higgins <brendanhiggins@google.com>
Reviewed-by: Tomer Maimon <tmaimon77@gmail.com>
Reviewed-by: Avi Fishman <avifishman70@gmail.com>
Tested-by: Tomer Maimon <tmaimon77@gmail.com>
Tested-by: Avi Fishman <avifishman70@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Brendan Higgins 2017-08-16 12:18:39 -07:00 committed by Arnd Bergmann
parent 6a498e06ba
commit 7bffa14c9a
7 changed files with 172 additions and 0 deletions
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2
arch/arm/Kconfig
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@ -779,6 +779,8 @@ 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"

1
arch/arm/Makefile
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@ -196,6 +196,7 @@ 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

48
arch/arm/mach-npcm/Kconfig Normal file
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@ -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

3
arch/arm/mach-npcm/Makefile Normal file
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@ -0,0 +1,3 @@
AFLAGS_headsmp.o += -march=armv7-a
obj-$(CONFIG_ARCH_NPCM750) += npcm7xx.o platsmp.o headsmp.o

17
arch/arm/mach-npcm/headsmp.S Normal file
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@ -0,0 +1,17 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018 Nuvoton Technology corporation.
// Copyright 2018 Google, Inc.
#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)

20
arch/arm/mach-npcm/npcm7xx.c Normal file
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@ -0,0 +1,20 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018 Nuvoton Technology corporation.
// Copyright 2018 Google, Inc.
#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

81
arch/arm/mach-npcm/platsmp.c Normal file
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@ -0,0 +1,81 @@
// SPDX-License-Identifier: GPL-2.0
// Copyright (c) 2018 Nuvoton Technology corporation.
// Copyright 2018 Google, Inc.
#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,npcm750-smp", &npcm7xx_smp_ops);