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
dummy_smp_setup(void)18 static void dummy_smp_setup(void)
19 {
20 }
21
dummy_prepare_cpus(unsigned int max_cpus)22 static void dummy_prepare_cpus(unsigned int max_cpus)
23 {
24 }
25
dummy_start_cpu(unsigned int cpu,unsigned long entry_point)26 static void dummy_start_cpu(unsigned int cpu, unsigned long entry_point)
27 {
28 }
29
dummy_smp_processor_id(void)30 static unsigned int dummy_smp_processor_id(void)
31 {
32 return 0;
33 }
34
dummy_send_ipi(unsigned int cpu,unsigned int message)35 static void dummy_send_ipi(unsigned int cpu, unsigned int message)
36 {
37 }
38
39 static 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
50 extern const struct of_cpu_method __cpu_method_of_table[];
51 const struct of_cpu_method __cpu_method_of_table_sentinel
52 __section("__cpu_method_of_table_end");
53
sh_of_smp_probe(void)54 static 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(np, 0);
66
67 if (id < NR_CPUS) {
68 if (!method)
69 of_property_read_string(np, "enable-method", &method);
70 set_cpu_possible(id, true);
71 set_cpu_present(id, 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, "cpus");
78 of_property_read_string(np, "enable-method", &method);
79 of_node_put(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
sh_of_smp_probe(void)95 static void sh_of_smp_probe(void)
96 {
97 }
98
99 #endif
100
noop(void)101 static void noop(void)
102 {
103 }
104
noopi(void)105 static int noopi(void)
106 {
107 return 0;
108 }
109
sh_of_mem_reserve(void)110 static void __init sh_of_mem_reserve(void)
111 {
112 early_init_fdt_reserve_self();
113 early_init_fdt_scan_reserved_mem();
114 }
115
sh_of_setup(char ** cmdline_p)116 static 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("/");
122 if (root) {
123 of_property_read_string(root, "model", &sh_mv.mv_name);
124 of_node_put(root);
125 }
126
127 sh_of_smp_probe();
128 }
129
sh_of_irq_demux(int irq)130 static 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
sh_of_init_irq(void)137 static 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
sh_of_clk_init(void)143 static 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
153 static 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
164 struct sh_clk_ops;
165
arch_init_clk_ops(struct sh_clk_ops ** ops,int idx)166 void __init __weak arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
167 {
168 }
169
plat_irq_setup(void)170 void __init __weak plat_irq_setup(void)
171 {
172 }
173
