Linux-libre 4.5-gnu

1 files changed, 91 insertions, 0 deletions

diff --git a/arch/arm/mach-realview/platsmp-dt.c b/arch/arm/mach-realview/platsmp-dt.c
new file mode 100644
index 000000000..6964e8876
--- /dev/null
+++ b/arch/arm/mach-realview/platsmp-dt.c
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2015 Linus Walleij
+ *
+ * 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/smp.h>
+#include <linux/io.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+
+#include <asm/cacheflush.h>
+#include <asm/smp_plat.h>
+#include <asm/smp_scu.h>
+
+#include <plat/platsmp.h>
+
+#include "core.h"
+
+#define REALVIEW_SYS_FLAGSSET_OFFSET	0x30
+
+static const struct of_device_id realview_scu_match[] = {
+	{ .compatible = "arm,arm11mp-scu", },
+	{ .compatible = "arm,cortex-a9-scu", },
+	{ .compatible = "arm,cortex-a5-scu", },
+	{ }
+};
+
+static const struct of_device_id realview_syscon_match[] = {
+        { .compatible = "arm,core-module-integrator", },
+        { .compatible = "arm,realview-eb-syscon", },
+        { .compatible = "arm,realview-pb11mp-syscon", },
+        { .compatible = "arm,realview-pbx-syscon", },
+        { },
+};
+
+static void __init realview_smp_prepare_cpus(unsigned int max_cpus)
+{
+	struct device_node *np;
+	void __iomem *scu_base;
+	struct regmap *map;
+	unsigned int ncores;
+	int i;
+
+	np = of_find_matching_node(NULL, realview_scu_match);
+	if (!np) {
+		pr_err("PLATSMP: No SCU base address\n");
+		return;
+	}
+	scu_base = of_iomap(np, 0);
+	of_node_put(np);
+	if (!scu_base) {
+		pr_err("PLATSMP: No SCU remap\n");
+		return;
+	}
+
+	scu_enable(scu_base);
+	ncores = scu_get_core_count(scu_base);
+	pr_info("SCU: %d cores detected\n", ncores);
+	for (i = 0; i < ncores; i++)
+		set_cpu_possible(i, true);
+	iounmap(scu_base);
+
+	/* The syscon contains the magic SMP start address registers */
+	np = of_find_matching_node(NULL, realview_syscon_match);
+	if (!np) {
+		pr_err("PLATSMP: No syscon match\n");
+		return;
+	}
+	map = syscon_node_to_regmap(np);
+	if (IS_ERR(map)) {
+		pr_err("PLATSMP: No syscon regmap\n");
+		return;
+	}
+	/* Put the boot address in this magic register */
+	regmap_write(map, REALVIEW_SYS_FLAGSSET_OFFSET,
+		     virt_to_phys(versatile_secondary_startup));
+}
+
+static const struct smp_operations realview_dt_smp_ops __initconst = {
+	.smp_prepare_cpus	= realview_smp_prepare_cpus,
+	.smp_secondary_init	= versatile_secondary_init,
+	.smp_boot_secondary	= versatile_boot_secondary,
+#ifdef CONFIG_HOTPLUG_CPU
+	.cpu_die		= realview_cpu_die,
+#endif
+};
+CPU_METHOD_OF_DECLARE(realview_smp, "arm,realview-smp", &realview_dt_smp_ops);