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Subject[PATCH 01/14] ARM: milbeaut: Add basic support for Milbeaut m10v SoC
Date
This adds the basic M10V SoC support under arch/arm.
Since all cores are activated in the custom bootloader before booting
linux, it is necessary to wait for sub-cores using the trampoline area.

Signed-off-by: Sugaya Taichi <sugaya.taichi@socionext.com>
---
arch/arm/Kconfig | 2 +
arch/arm/Makefile | 1 +
arch/arm/mach-milbeaut/Kconfig | 28 +++++++
arch/arm/mach-milbeaut/Makefile | 3 +
arch/arm/mach-milbeaut/m10v_evb.c | 31 ++++++++
arch/arm/mach-milbeaut/platsmp.c | 157 ++++++++++++++++++++++++++++++++++++++
6 files changed, 222 insertions(+)
create mode 100644 arch/arm/mach-milbeaut/Kconfig
create mode 100644 arch/arm/mach-milbeaut/Makefile
create mode 100644 arch/arm/mach-milbeaut/m10v_evb.c
create mode 100644 arch/arm/mach-milbeaut/platsmp.c

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 91be74d..0b8a1af 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -767,6 +767,8 @@ source "arch/arm/mach-mediatek/Kconfig"

source "arch/arm/mach-meson/Kconfig"

+source "arch/arm/mach-milbeaut/Kconfig"
+
source "arch/arm/mach-mmp/Kconfig"

source "arch/arm/mach-moxart/Kconfig"
diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 05a91d8..627853c 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -190,6 +190,7 @@ machine-$(CONFIG_ARCH_MV78XX0) += mv78xx0
machine-$(CONFIG_ARCH_MVEBU) += mvebu
machine-$(CONFIG_ARCH_MXC) += imx
machine-$(CONFIG_ARCH_MEDIATEK) += mediatek
+machine-$(CONFIG_ARCH_MILBEAUT) += milbeaut
machine-$(CONFIG_ARCH_MXS) += mxs
machine-$(CONFIG_ARCH_NETX) += netx
machine-$(CONFIG_ARCH_NOMADIK) += nomadik
diff --git a/arch/arm/mach-milbeaut/Kconfig b/arch/arm/mach-milbeaut/Kconfig
new file mode 100644
index 0000000..63b6f69
--- /dev/null
+++ b/arch/arm/mach-milbeaut/Kconfig
@@ -0,0 +1,28 @@
+# SPDX-License-Identifier: GPL-2.0
+menuconfig ARCH_MILBEAUT
+ bool "Socionext Milbeaut SoCs"
+ depends on ARCH_MULTI_V7
+ select ARM_GIC
+ select CLKDEV_LOOKUP
+ select GENERIC_CLOCKEVENTS
+ select CLKSRC_MMIO
+ select ZONE_DMA
+ help
+ This enables support for Socionext Milbeaut SoCs
+
+if ARCH_MILBEAUT
+
+config ARCH_MILBEAUT_M10V
+ bool "Milbeaut SC2000/M10V platform"
+ select ARM_ARCH_TIMER
+ select M10V_TIMER
+ select PINCTRL
+ select PINCTRL_M10V
+ help
+ Support for Socionext's MILBEAUT M10V based systems
+
+config MACH_M10V_EVB
+ bool "Support for Milbeaut Evaluation boards"
+ default y
+
+endif
diff --git a/arch/arm/mach-milbeaut/Makefile b/arch/arm/mach-milbeaut/Makefile
new file mode 100644
index 0000000..64f6f52
--- /dev/null
+++ b/arch/arm/mach-milbeaut/Makefile
@@ -0,0 +1,3 @@
+obj-$(CONFIG_SMP) += platsmp.o
+obj-$(CONFIG_MACH_M10V_EVB) += m10v_evb.o
+
diff --git a/arch/arm/mach-milbeaut/m10v_evb.c b/arch/arm/mach-milbeaut/m10v_evb.c
new file mode 100644
index 0000000..a1fa7c3
--- /dev/null
+++ b/arch/arm/mach-milbeaut/m10v_evb.c
@@ -0,0 +1,31 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Socionext Inc.
+ * Copyright: (C) 2015 Linaro Ltd.
+ */
+
+#include <linux/of.h>
+#include <linux/platform_device.h>
+
+#include <asm/mach/arch.h>
+#include <asm/mach/map.h>
+
+static struct map_desc m10v_io_desc[] __initdata = {
+};
+
+void __init m10v_map_io(void)
+{
+ debug_ll_io_init();
+ iotable_init(m10v_io_desc, ARRAY_SIZE(m10v_io_desc));
+}
+
+static const char * const m10v_compat[] = {
+ "socionext,milbeaut-m10v-evb",
+ NULL,
+};
+
+DT_MACHINE_START(M10V_REB, "Socionext Milbeaut")
+ .dt_compat = m10v_compat,
+ .l2c_aux_mask = 0xffffffff,
+ .map_io = m10v_map_io,
+MACHINE_END
diff --git a/arch/arm/mach-milbeaut/platsmp.c b/arch/arm/mach-milbeaut/platsmp.c
new file mode 100644
index 0000000..b706851
--- /dev/null
+++ b/arch/arm/mach-milbeaut/platsmp.c
@@ -0,0 +1,157 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2018 Socionext Inc.
+ * Copyright: (C) 2015 Linaro Ltd.
+ */
+
+#include <linux/cpu_pm.h>
+#include <linux/irqchip/arm-gic.h>
+#include <linux/of_device.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/suspend.h>
+
+#include <asm/cacheflush.h>
+#include <asm/cp15.h>
+#include <asm/idmap.h>
+#include <asm/smp_plat.h>
+#include <asm/suspend.h>
+
+#define M10V_MAX_CPU 4
+
+#define KERNEL_UNBOOT_FLAG 0x12345678
+#define CPU_FINISH_SUSPEND_FLAG 0x56784321
+
+static void __iomem *trampoline;
+
+static int m10v_boot_secondary(unsigned int l_cpu, struct task_struct *idle)
+{
+ unsigned int mpidr, cpu, cluster;
+
+ mpidr = cpu_logical_map(l_cpu);
+ cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+ cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+
+ if (cpu >= M10V_MAX_CPU)
+ return -EINVAL;
+
+ pr_debug("%s: cpu %u cluster %u\n", __func__, cpu, cluster);
+
+ writel(virt_to_phys(secondary_startup), trampoline + cpu * 4);
+ arch_send_wakeup_ipi_mask(cpumask_of(l_cpu));
+
+ return 0;
+}
+
+static void m10v_cpu_die(unsigned int l_cpu)
+{
+ gic_cpu_if_down(0);
+
+ v7_exit_coherency_flush(louis);
+
+ /* Now we are prepared for power-down, do it: */
+ wfi();
+}
+
+static int m10v_cpu_kill(unsigned int l_cpu)
+{
+ unsigned int mpidr, cpu;
+
+ mpidr = cpu_logical_map(l_cpu);
+ cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+
+ writel(KERNEL_UNBOOT_FLAG, trampoline + cpu * 4);
+
+ return 1;
+}
+
+static struct smp_operations m10v_smp_ops __initdata = {
+ .smp_boot_secondary = m10v_boot_secondary,
+ .cpu_die = m10v_cpu_die,
+ .cpu_kill = m10v_cpu_kill,
+};
+
+static int __init m10v_smp_init(void)
+{
+ unsigned int mpidr, cpu, cluster;
+ struct device_node *np;
+
+ np = of_find_compatible_node(NULL, NULL, "socionext,milbeaut-m10v-evb");
+ if (!np || !of_device_is_available(np))
+ return -ENODEV;
+ of_node_put(np);
+
+ np = of_find_compatible_node(NULL, NULL, "socionext,smp-trampoline");
+ if (!np)
+ return -ENODEV;
+
+ trampoline = of_iomap(np, 0);
+ if (!trampoline)
+ return -ENODEV;
+ of_node_put(np);
+
+ mpidr = read_cpuid_mpidr();
+ cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
+ cluster = MPIDR_AFFINITY_LEVEL(mpidr, 1);
+
+ pr_info("MCPM boot on cpu_%u cluster_%u\n", cpu, cluster);
+
+ for (cpu = 0; cpu < M10V_MAX_CPU; cpu++)
+ writel(KERNEL_UNBOOT_FLAG, trampoline + cpu * 4);
+
+ smp_set_ops(&m10v_smp_ops);
+
+ return 0;
+}
+early_initcall(m10v_smp_init);
+
+static int m10v_pm_valid(suspend_state_t state)
+{
+ return (state == PM_SUSPEND_STANDBY) || (state == PM_SUSPEND_MEM);
+}
+
+typedef void (*phys_reset_t)(unsigned long);
+static phys_reset_t phys_reset;
+
+static int m10v_die(unsigned long arg)
+{
+ setup_mm_for_reboot();
+ asm("wfi");
+ /* Boot just like a secondary */
+ phys_reset = (phys_reset_t)(unsigned long)virt_to_phys(cpu_reset);
+ phys_reset(virt_to_phys(cpu_resume));
+
+ return 0;
+}
+
+static int m10v_pm_enter(suspend_state_t state)
+{
+ switch (state) {
+ case PM_SUSPEND_STANDBY:
+ pr_err("STANDBY\n");
+ asm("wfi");
+ break;
+ case PM_SUSPEND_MEM:
+ pr_err("SUSPEND\n");
+ cpu_pm_enter();
+ cpu_suspend(0, m10v_die);
+ cpu_pm_exit();
+ break;
+ }
+ return 0;
+}
+
+static const struct platform_suspend_ops m10v_pm_ops = {
+ .valid = m10v_pm_valid,
+ .enter = m10v_pm_enter,
+};
+
+struct clk *m10v_clclk_register(struct device *cpu_dev);
+
+static int __init m10v_pm_init(void)
+{
+ suspend_set_ops(&m10v_pm_ops);
+
+ return 0;
+}
+late_initcall(m10v_pm_init);
--
1.9.1
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