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