arch/sh/boards/of-generic.c

   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
  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 }