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 u64 id = of_get_cpu_hwid(cpun: np, thread: 0);
66
67 if (id < NR_CPUS) {
68 if (!method)
69 of_property_read_string(np, propname: "enable-method", out_string: &method);
70 set_cpu_possible(cpu: id, possible: true);
71 set_cpu_present(cpu: id, present: true);
72 __cpu_number_map[id] = id;
73 __cpu_logical_map[id] = id;
74 }
75 }
76 if (!method) {
77 np = of_find_node_by_name(NULL, name: "cpus");
78 of_property_read_string(np, propname: "enable-method", out_string: &method);
79 of_node_put(node: np);
80 }
81
82 pr_info("CPU enable method: %s\n", method);
83 if (method)
84 for (; m->method; m++)
85 if (!strcmp(m->method, method)) {
86 register_smp_ops(m->ops);
87 return;
88 }
89
90 register_smp_ops(&dummy_smp_ops);
91}
92
93#else
94
95static void sh_of_smp_probe(void)
96{
97}
98
99#endif
100
101static void noop(void)
102{
103}
104
105static int noopi(void)
106{
107 return 0;
108}
109
110static void __init sh_of_mem_reserve(void)
111{
112 early_init_fdt_reserve_self();
113 early_init_fdt_scan_reserved_mem();
114}
115
116static void __init sh_of_setup(char **cmdline_p)
117{
118 struct device_node *root;
119
120 sh_mv.mv_name = "Unknown SH model";
121 root = of_find_node_by_path(path: "/");
122 if (root) {
123 of_property_read_string(np: root, propname: "model", out_string: &sh_mv.mv_name);
124 of_node_put(node: root);
125 }
126
127 sh_of_smp_probe();
128}
129
130static int sh_of_irq_demux(int irq)
131{
132 /* FIXME: eventually this should not be used at all;
133 * the interrupt controller should set_handle_irq(). */
134 return irq;
135}
136
137static void __init sh_of_init_irq(void)
138{
139 pr_info("SH generic board support: scanning for interrupt controllers\n");
140 irqchip_init();
141}
142
143static int __init sh_of_clk_init(void)
144{
145#ifdef CONFIG_COMMON_CLK
146 /* Disabled pending move to COMMON_CLK framework. */
147 pr_info("SH generic board support: scanning for clk providers\n");
148 of_clk_init(NULL);
149#endif
150 return 0;
151}
152
153static struct sh_machine_vector __initmv sh_of_generic_mv = {
154 .mv_setup = sh_of_setup,
155 .mv_name = "devicetree", /* replaced by DT root's model */
156 .mv_irq_demux = sh_of_irq_demux,
157 .mv_init_irq = sh_of_init_irq,
158 .mv_clk_init = sh_of_clk_init,
159 .mv_mode_pins = noopi,
160 .mv_mem_init = noop,
161 .mv_mem_reserve = sh_of_mem_reserve,
162};
163
164struct sh_clk_ops;
165
166void __init __weak arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
167{
168}
169
170void __init __weak plat_irq_setup(void)
171{
172}
173

source code of linux/arch/sh/boards/of-generic.c