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Linux/arch/sh/boards/of-generic.c

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  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_fdt.h>
 10 #include <linux/clocksource.h>
 11 #include <linux/irqchip.h>
 12 #include <linux/clk-provider.h>
 13 #include <asm/machvec.h>
 14 #include <asm/rtc.h>
 15 
 16 #ifdef CONFIG_SMP
 17 
 18 static void dummy_smp_setup(void)
 19 {
 20 }
 21 
 22 static void dummy_prepare_cpus(unsigned int max_cpus)
 23 {
 24 }
 25 
 26 static void dummy_start_cpu(unsigned int cpu, unsigned long entry_point)
 27 {
 28 }
 29 
 30 static unsigned int dummy_smp_processor_id(void)
 31 {
 32         return 0;
 33 }
 34 
 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 
 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                 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 
 96 static void sh_of_smp_probe(void)
 97 {
 98 }
 99 
100 #endif
101 
102 static void noop(void)
103 {
104 }
105 
106 static int noopi(void)
107 {
108         return 0;
109 }
110 
111 static void __init sh_of_mem_reserve(void)
112 {
113         early_init_fdt_reserve_self();
114         early_init_fdt_scan_reserved_mem();
115 }
116 
117 static 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 
131 static 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 
138 static 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 
144 static 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 
154 static 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 
165 struct sh_clk_ops;
166 
167 void __init __weak arch_init_clk_ops(struct sh_clk_ops **ops, int idx)
168 {
169 }
170 
171 void __init __weak plat_irq_setup(void)
172 {
173 }
174 

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