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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /arch/arm/mach-shmobile/smp-r8a7779.c
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/arm/mach-shmobile/smp-r8a7779.c')
-rw-r--r--arch/arm/mach-shmobile/smp-r8a7779.c80
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/arm/mach-shmobile/smp-r8a7779.c b/arch/arm/mach-shmobile/smp-r8a7779.c
new file mode 100644
index 0000000000..1bc609986c
--- /dev/null
+++ b/arch/arm/mach-shmobile/smp-r8a7779.c
@@ -0,0 +1,80 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SMP support for R-Mobile / SH-Mobile - r8a7779 portion
+ *
+ * Copyright (C) 2011 Renesas Solutions Corp.
+ * Copyright (C) 2011 Magnus Damm
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/smp.h>
+#include <linux/spinlock.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/soc/renesas/rcar-sysc.h>
+
+#include <asm/cacheflush.h>
+#include <asm/smp_plat.h>
+#include <asm/smp_scu.h>
+
+#include "common.h"
+#include "r8a7779.h"
+
+#define HPBREG_BASE 0xfe700000
+#define AVECR 0x0040 /* ARM Reset Vector Address Register */
+
+#define R8A7779_SCU_BASE 0xf0000000
+
+static int r8a7779_boot_secondary(unsigned int cpu, struct task_struct *idle)
+{
+ int ret = -EIO;
+
+ cpu = cpu_logical_map(cpu);
+ if (cpu)
+ ret = rcar_sysc_power_up_cpu(cpu);
+
+ return ret;
+}
+
+static void __init r8a7779_smp_prepare_cpus(unsigned int max_cpus)
+{
+ void __iomem *base = ioremap(HPBREG_BASE, 0x1000);
+
+ /* Map the reset vector (in headsmp-scu.S, headsmp.S) */
+ writel(__pa(shmobile_boot_vector), base + AVECR);
+
+ /* setup r8a7779 specific SCU bits */
+ shmobile_smp_scu_prepare_cpus(R8A7779_SCU_BASE, max_cpus);
+
+ iounmap(base);
+}
+
+#ifdef CONFIG_HOTPLUG_CPU
+static int r8a7779_platform_cpu_kill(unsigned int cpu)
+{
+ int ret = -EIO;
+
+ cpu = cpu_logical_map(cpu);
+ if (cpu)
+ ret = rcar_sysc_power_down_cpu(cpu);
+
+ return ret ? ret : 1;
+}
+
+static int r8a7779_cpu_kill(unsigned int cpu)
+{
+ if (shmobile_smp_scu_cpu_kill(cpu))
+ return r8a7779_platform_cpu_kill(cpu);
+
+ return 0;
+}
+#endif /* CONFIG_HOTPLUG_CPU */
+
+const struct smp_operations r8a7779_smp_ops __initconst = {
+ .smp_prepare_cpus = r8a7779_smp_prepare_cpus,
+ .smp_boot_secondary = r8a7779_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+ .cpu_die = shmobile_smp_scu_cpu_die,
+ .cpu_kill = r8a7779_cpu_kill,
+#endif
+};