Rich Felker | 7480e0a | 2016-01-23 00:45:41 +0000 | [diff] [blame] | 1 | /* |
| 2 | * SH generic board support, using device tree |
| 3 | * |
| 4 | * Copyright (C) 2015-2016 Smart Energy Instruments, Inc. |
| 5 | * |
| 6 | * This file is subject to the terms and conditions of the GNU General Public |
| 7 | * License. See the file "COPYING" in the main directory of this archive |
| 8 | * for more details. |
| 9 | */ |
| 10 | |
| 11 | #include <linux/of.h> |
| 12 | #include <linux/of_platform.h> |
| 13 | #include <linux/of_fdt.h> |
| 14 | #include <linux/of_iommu.h> |
| 15 | #include <linux/clocksource.h> |
| 16 | #include <linux/irqchip.h> |
| 17 | #include <linux/clk-provider.h> |
| 18 | #include <asm/machvec.h> |
| 19 | #include <asm/rtc.h> |
| 20 | |
Rich Felker | 044b81f | 2016-02-15 18:30:50 +0000 | [diff] [blame^] | 21 | #ifdef CONFIG_SMP |
| 22 | |
| 23 | static void dummy_smp_setup(void) |
| 24 | { |
| 25 | } |
| 26 | |
| 27 | static void dummy_prepare_cpus(unsigned int max_cpus) |
| 28 | { |
| 29 | } |
| 30 | |
| 31 | static void dummy_start_cpu(unsigned int cpu, unsigned long entry_point) |
| 32 | { |
| 33 | } |
| 34 | |
| 35 | static unsigned int dummy_smp_processor_id(void) |
| 36 | { |
| 37 | return 0; |
| 38 | } |
| 39 | |
| 40 | static void dummy_send_ipi(unsigned int cpu, unsigned int message) |
| 41 | { |
| 42 | } |
| 43 | |
| 44 | static struct plat_smp_ops dummy_smp_ops = { |
| 45 | .smp_setup = dummy_smp_setup, |
| 46 | .prepare_cpus = dummy_prepare_cpus, |
| 47 | .start_cpu = dummy_start_cpu, |
| 48 | .smp_processor_id = dummy_smp_processor_id, |
| 49 | .send_ipi = dummy_send_ipi, |
| 50 | .cpu_die = native_cpu_die, |
| 51 | .cpu_disable = native_cpu_disable, |
| 52 | .play_dead = native_play_dead, |
| 53 | }; |
| 54 | |
| 55 | extern const struct of_cpu_method __cpu_method_of_table[]; |
| 56 | const struct of_cpu_method __cpu_method_of_table_sentinel |
| 57 | __section(__cpu_method_of_table_end); |
| 58 | |
| 59 | static void sh_of_smp_probe(void) |
| 60 | { |
| 61 | struct device_node *np = 0; |
| 62 | const char *method = 0; |
| 63 | const struct of_cpu_method *m = __cpu_method_of_table; |
| 64 | |
| 65 | pr_info("SH generic board support: scanning for cpus\n"); |
| 66 | |
| 67 | init_cpu_possible(cpumask_of(0)); |
| 68 | |
| 69 | while ((np = of_find_node_by_type(np, "cpu"))) { |
| 70 | const __be32 *cell = of_get_property(np, "reg", NULL); |
| 71 | u64 id = -1; |
| 72 | if (cell) id = of_read_number(cell, of_n_addr_cells(np)); |
| 73 | if (id < NR_CPUS) { |
| 74 | if (!method) |
| 75 | of_property_read_string(np, "enable-method", &method); |
| 76 | set_cpu_possible(id, true); |
| 77 | set_cpu_present(id, true); |
| 78 | __cpu_number_map[id] = id; |
| 79 | __cpu_logical_map[id] = id; |
| 80 | } |
| 81 | } |
| 82 | if (!method) { |
| 83 | np = of_find_node_by_name(NULL, "cpus"); |
| 84 | of_property_read_string(np, "enable-method", &method); |
| 85 | } |
| 86 | |
| 87 | pr_info("CPU enable method: %s\n", method); |
| 88 | if (method) |
| 89 | for (; m->method; m++) |
| 90 | if (!strcmp(m->method, method)) { |
| 91 | register_smp_ops(m->ops); |
| 92 | return; |
| 93 | } |
| 94 | |
| 95 | register_smp_ops(&dummy_smp_ops); |
| 96 | } |
| 97 | |
| 98 | #else |
| 99 | |
| 100 | static void sh_of_smp_probe(void) |
| 101 | { |
| 102 | } |
| 103 | |
| 104 | #endif |
| 105 | |
Rich Felker | 7480e0a | 2016-01-23 00:45:41 +0000 | [diff] [blame] | 106 | static void noop(void) |
| 107 | { |
| 108 | } |
| 109 | |
| 110 | static int noopi(void) |
| 111 | { |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | static void __init sh_of_mem_reserve(void) |
| 116 | { |
| 117 | early_init_fdt_reserve_self(); |
| 118 | early_init_fdt_scan_reserved_mem(); |
| 119 | } |
| 120 | |
| 121 | static void __init sh_of_time_init(void) |
| 122 | { |
| 123 | pr_info("SH generic board support: scanning for clocksource devices\n"); |
| 124 | clocksource_probe(); |
| 125 | } |
| 126 | |
| 127 | static void __init sh_of_setup(char **cmdline_p) |
| 128 | { |
| 129 | unflatten_device_tree(); |
| 130 | |
| 131 | board_time_init = sh_of_time_init; |
| 132 | |
| 133 | sh_mv.mv_name = of_flat_dt_get_machine_name(); |
| 134 | if (!sh_mv.mv_name) |
| 135 | sh_mv.mv_name = "Unknown SH model"; |
| 136 | |
Rich Felker | 044b81f | 2016-02-15 18:30:50 +0000 | [diff] [blame^] | 137 | sh_of_smp_probe(); |
Rich Felker | 7480e0a | 2016-01-23 00:45:41 +0000 | [diff] [blame] | 138 | } |
| 139 | |
| 140 | static int sh_of_irq_demux(int irq) |
| 141 | { |
| 142 | /* FIXME: eventually this should not be used at all; |
| 143 | * the interrupt controller should set_handle_irq(). */ |
| 144 | return irq; |
| 145 | } |
| 146 | |
| 147 | static void __init sh_of_init_irq(void) |
| 148 | { |
| 149 | pr_info("SH generic board support: scanning for interrupt controllers\n"); |
| 150 | irqchip_init(); |
| 151 | } |
| 152 | |
| 153 | static int __init sh_of_clk_init(void) |
| 154 | { |
| 155 | #ifdef CONFIG_COMMON_CLK |
| 156 | /* Disabled pending move to COMMON_CLK framework. */ |
| 157 | pr_info("SH generic board support: scanning for clk providers\n"); |
| 158 | of_clk_init(NULL); |
| 159 | #endif |
| 160 | return 0; |
| 161 | } |
| 162 | |
| 163 | static struct sh_machine_vector __initmv sh_of_generic_mv = { |
| 164 | .mv_setup = sh_of_setup, |
| 165 | .mv_name = "devicetree", /* replaced by DT root's model */ |
| 166 | .mv_irq_demux = sh_of_irq_demux, |
| 167 | .mv_init_irq = sh_of_init_irq, |
| 168 | .mv_clk_init = sh_of_clk_init, |
| 169 | .mv_mode_pins = noopi, |
| 170 | .mv_mem_init = noop, |
| 171 | .mv_mem_reserve = sh_of_mem_reserve, |
| 172 | }; |
| 173 | |
| 174 | struct sh_clk_ops; |
| 175 | |
| 176 | void __init arch_init_clk_ops(struct sh_clk_ops **ops, int idx) |
| 177 | { |
| 178 | } |
| 179 | |
| 180 | void __init plat_irq_setup(void) |
| 181 | { |
| 182 | } |
| 183 | |
| 184 | static int __init sh_of_device_init(void) |
| 185 | { |
| 186 | pr_info("SH generic board support: populating platform devices\n"); |
| 187 | if (of_have_populated_dt()) { |
| 188 | of_iommu_init(); |
| 189 | of_platform_populate(NULL, of_default_bus_match_table, |
| 190 | NULL, NULL); |
| 191 | } else { |
| 192 | pr_crit("Device tree not populated\n"); |
| 193 | } |
| 194 | return 0; |
| 195 | } |
| 196 | arch_initcall_sync(sh_of_device_init); |