1 files changed, 196 insertions, 0 deletions
diff --git a/arch/sh/boards/of-generic.c b/arch/sh/boards/of-generic.c
new file mode 100644
index 000000000000..bf3a166a5407
--- /dev/null
+++ b/arch/sh/boards/of-generic.c
@@ -0,0 +1,196 @@
+/*
+ * SH generic board support, using device tree
+ *
+ * Copyright (C) 2015-2016 Smart Energy Instruments, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+
+#include <linux/of.h>
+#include <linux/of_platform.h>
+#include <linux/of_fdt.h>
+#include <linux/of_iommu.h>
+#include <linux/clocksource.h>
+#include <linux/irqchip.h>
+#include <linux/clk-provider.h>
+#include <asm/machvec.h>
+#include <asm/rtc.h>
+
+#ifdef CONFIG_SMP
+
+static void dummy_smp_setup(void)
+{
+}
+
+static void dummy_prepare_cpus(unsigned int max_cpus)
+{
+}
+
+static void dummy_start_cpu(unsigned int cpu, unsigned long entry_point)
+{
+}
+
+static unsigned int dummy_smp_processor_id(void)
+{
+	return 0;
+}
+
+static void dummy_send_ipi(unsigned int cpu, unsigned int message)
+{
+}
+
+static struct plat_smp_ops dummy_smp_ops = {
+	.smp_setup		= dummy_smp_setup,
+	.prepare_cpus		= dummy_prepare_cpus,
+	.start_cpu		= dummy_start_cpu,
+	.smp_processor_id	= dummy_smp_processor_id,
+	.send_ipi		= dummy_send_ipi,
+	.cpu_die		= native_cpu_die,
+	.cpu_disable		= native_cpu_disable,
+	.play_dead		= native_play_dead,
+};
+
+extern const struct of_cpu_method __cpu_method_of_table[];
+const struct of_cpu_method __cpu_method_of_table_sentinel
+	__section(__cpu_method_of_table_end);
+
+static void sh_of_smp_probe(void)
+{
+	struct device_node *np = 0;
+	const char *method = 0;
+	const struct of_cpu_method *m = __cpu_method_of_table;
+
+	pr_info("SH generic board support: scanning for cpus\n");
+
+	init_cpu_possible(cpumask_of(0));
+
+	while ((np = of_find_node_by_type(np, "cpu"))) {
+		const __be32 *cell = of_get_property(np, "reg", NULL);
+		u64 id = -1;
+		if (cell) id = of_read_number(cell, of_n_addr_cells(np));
+		if (id < NR_CPUS) {
+			if (!method)
+				of_property_read_string(np, "enable-method", &method);
+			set_cpu_possible(id, true);
+			set_cpu_present(id, true);
+			__cpu_number_map[id] = id;
+			__cpu_logical_map[id] = id;
+		}
+	}
+	if (!method) {
+		np = of_find_node_by_name(NULL, "cpus");
+		of_property_read_string(np, "enable-method", &method);
+	}
+
+	pr_info("CPU enable method: %s\n", method);
+	if (method)
+		for (; m->method; m++)
+			if (!strcmp(m->method, method)) {
+				register_smp_ops(m->ops);
+				return;
+			}
+
+	register_smp_ops(&dummy_smp_ops);
+}
+
+#else
+
+static void sh_of_smp_probe(void)
+{
+}
+
+#endif
+
+static void noop(void)
+{
+}
+
+static int noopi(void)
+{
+	return 0;
+}
+
+static void __init sh_of_mem_reserve(void)
+{
+	early_init_fdt_reserve_self();
+	early_init_fdt_scan_reserved_mem();
+}
+
+static void __init sh_of_time_init(void)
+{
+	pr_info("SH generic board support: scanning for clocksource devices\n");
+	clocksource_probe();
+}
+
+static void __init sh_of_setup(char **cmdline_p)
+{
+	unflatten_device_tree();
+
+	board_time_init = sh_of_time_init;
+
+	sh_mv.mv_name = of_flat_dt_get_machine_name();
+	if (!sh_mv.mv_name)
+		sh_mv.mv_name = "Unknown SH model";
+
+	sh_of_smp_probe();
+}
+
+static int sh_of_irq_demux(int irq)
+{
+	/* FIXME: eventually this should not be used at all;
+	 * the interrupt controller should set_handle_irq(). */
+	return irq;
+}
+
+static void __init sh_of_init_irq(void)
+{
+	pr_info("SH generic board support: scanning for interrupt controllers\n");
+	irqchip_init();
+}
+
+static int __init sh_of_clk_init(void)
+{
+#ifdef CONFIG_COMMON_CLK
+	/* Disabled pending move to COMMON_CLK framework. */
+	pr_info("SH generic board support: scanning for clk providers\n");
+	of_clk_init(NULL);
+#endif
+	return 0;
+}
+
+static struct sh_machine_vector __initmv sh_of_generic_mv = {
+	.mv_setup	= sh_of_setup,
+	.mv_name	= "devicetree", /* replaced by DT root's model */
+	.mv_irq_demux	= sh_of_irq_demux,
+	.mv_init_irq	= sh_of_init_irq,
+	.mv_clk_init	= sh_of_clk_init,
+	.mv_mode_pins	= noopi,
+	.mv_mem_init	= noop,
+	.mv_mem_reserve	= sh_of_mem_reserve,
+};
+
+struct sh_clk_ops;
+
+void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
+{
+}
+
+void __init plat_irq_setup(void)
+{
+}
+
+static int __init sh_of_device_init(void)
+{
+	pr_info("SH generic board support: populating platform devices\n");
+	if (of_have_populated_dt()) {
+		of_iommu_init();
+		of_platform_populate(NULL, of_default_bus_match_table,
+				     NULL, NULL);
+	} else {
+		pr_crit("Device tree not populated\n");
+	}
+	return 0;
+}
+arch_initcall_sync(sh_of_device_init);