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Subject[PATCH v9 1/3] arm: npcm: add basic support for Nuvoton BMCs
Date
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>
---
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 | 17 ++++++++++
arch/arm/mach-npcm/npcm7xx.c | 20 +++++++++++
arch/arm/mach-npcm/platsmp.c | 81 ++++++++++++++++++++++++++++++++++++++++++++
7 files changed, 172 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..c083fe09a07b
--- /dev/null
+++ b/arch/arm/mach-npcm/headsmp.S
@@ -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)
diff --git a/arch/arm/mach-npcm/npcm7xx.c b/arch/arm/mach-npcm/npcm7xx.c
new file mode 100644
index 000000000000..5f7cd88103ef
--- /dev/null
+++ b/arch/arm/mach-npcm/npcm7xx.c
@@ -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
diff --git a/arch/arm/mach-npcm/platsmp.c b/arch/arm/mach-npcm/platsmp.c
new file mode 100644
index 000000000000..49079cd5c63c
--- /dev/null
+++ b/arch/arm/mach-npcm/platsmp.c
@@ -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,npcm7xx-smp", &npcm7xx_smp_ops);
--
2.16.0.rc1.238.g530d649a79-goog
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