1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * SH generic board support, using device tree
  4 *
  5 * Copyright (C) 2015-2016 Smart Energy Instruments, Inc.
  6 */
  7
  8#include <linux/of.h>
  9#include <linux/of_clk.h>
 10#include <linux/of_fdt.h>
 11#include <linux/clocksource.h>
 12#include <linux/irqchip.h>
 13#include <asm/machvec.h>
 14#include <asm/rtc.h>
 15
 16#ifdef CONFIG_SMP
 17
 18static void dummy_smp_setup(void)
 19{
 20}
 21
 22static void dummy_prepare_cpus(unsigned int max_cpus)
 23{
 24}
 25
 26static void dummy_start_cpu(unsigned int cpu, unsigned long entry_point)
 27{
 28}
 29
 30static unsigned int dummy_smp_processor_id(void)
 31{
 32	return 0;
 33}
 34
 35static void dummy_send_ipi(unsigned int cpu, unsigned int message)
 36{
 37}
 38
 39static struct plat_smp_ops dummy_smp_ops = {
 40	.smp_setup		= dummy_smp_setup,
 41	.prepare_cpus		= dummy_prepare_cpus,
 42	.start_cpu		= dummy_start_cpu,
 43	.smp_processor_id	= dummy_smp_processor_id,
 44	.send_ipi		= dummy_send_ipi,
 45	.cpu_die		= native_cpu_die,
 46	.cpu_disable		= native_cpu_disable,
 47	.play_dead		= native_play_dead,
 48};
 49
 50extern const struct of_cpu_method __cpu_method_of_table[];
 51const struct of_cpu_method __cpu_method_of_table_sentinel
 52	__section("__cpu_method_of_table_end");
 53
 54static void sh_of_smp_probe(void)
 55{
 56	struct device_node *np;
 57	const char *method = NULL;
 58	const struct of_cpu_method *m = __cpu_method_of_table;
 59
 60	pr_info("SH generic board support: scanning for cpus\n");
 61
 62	init_cpu_possible(cpumask_of(0));
 63
 64	for_each_of_cpu_node(np) {
 65		const __be32 *cell = of_get_property(np, "reg", NULL);
 66		u64 id = -1;
 67		if (cell) id = of_read_number(cell, of_n_addr_cells(np));
 68		if (id < NR_CPUS) {
 69			if (!method)
 70				of_property_read_string(np, "enable-method", &method);
 71			set_cpu_possible(id, true);
 72			set_cpu_present(id, true);
 73			__cpu_number_map[id] = id;
 74			__cpu_logical_map[id] = id;
 75		}
 76	}
 77	if (!method) {
 78		np = of_find_node_by_name(NULL, "cpus");
 79		of_property_read_string(np, "enable-method", &method);
 80		of_node_put(np);
 81	}
 82
 83	pr_info("CPU enable method: %s\n", method);
 84	if (method)
 85		for (; m->method; m++)
 86			if (!strcmp(m->method, method)) {
 87				register_smp_ops(m->ops);
 88				return;
 89			}
 90
 91	register_smp_ops(&dummy_smp_ops);
 92}
 93
 94#else
 95
 96static void sh_of_smp_probe(void)
 97{
 98}
 99
100#endif
101
102static void noop(void)
103{
104}
105
106static int noopi(void)
107{
108	return 0;
109}
110
111static void __init sh_of_mem_reserve(void)
112{
113	early_init_fdt_reserve_self();
114	early_init_fdt_scan_reserved_mem();
115}
116
117static void __init sh_of_setup(char **cmdline_p)
118{
119	struct device_node *root;
120
121	sh_mv.mv_name = "Unknown SH model";
122	root = of_find_node_by_path("/");
123	if (root) {
124		of_property_read_string(root, "model", &sh_mv.mv_name);
125		of_node_put(root);
126	}
127
128	sh_of_smp_probe();
129}
130
131static int sh_of_irq_demux(int irq)
132{
133	/* FIXME: eventually this should not be used at all;
134	 * the interrupt controller should set_handle_irq(). */
135	return irq;
136}
137
138static void __init sh_of_init_irq(void)
139{
140	pr_info("SH generic board support: scanning for interrupt controllers\n");
141	irqchip_init();
142}
143
144static int __init sh_of_clk_init(void)
145{
146#ifdef CONFIG_COMMON_CLK
147	/* Disabled pending move to COMMON_CLK framework. */
148	pr_info("SH generic board support: scanning for clk providers\n");
149	of_clk_init(NULL);
150#endif
151	return 0;
152}
153
154static struct sh_machine_vector __initmv sh_of_generic_mv = {
155	.mv_setup	= sh_of_setup,
156	.mv_name	= "devicetree", /* replaced by DT root's model */
157	.mv_irq_demux	= sh_of_irq_demux,
158	.mv_init_irq	= sh_of_init_irq,
159	.mv_clk_init	= sh_of_clk_init,
160	.mv_mode_pins	= noopi,
161	.mv_mem_init	= noop,
162	.mv_mem_reserve	= sh_of_mem_reserve,
163};
164
165struct sh_clk_ops;
166
167void __init __weak arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
168{
169}
170
171void __init __weak plat_irq_setup(void)
172{
173}