1 /* 2 * Copyright (C) 2015 Jens Kuske <jenskuske@gmail.com> 3 * 4 * Based on clk-simple-gates.c, which is: 5 * Copyright 2015 Maxime Ripard 6 * 7 * Maxime Ripard <maxime.ripard@free-electrons.com> 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2 of the License, or 12 * (at your option) any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 */ 19 20 #include <linux/clk-provider.h> 21 #include <linux/of.h> 22 #include <linux/of_address.h> 23 #include <linux/slab.h> 24 #include <linux/spinlock.h> 25 26 static DEFINE_SPINLOCK(gates_lock); 27 28 static void __init sun8i_h3_bus_gates_init(struct device_node *node) 29 { 30 static const char * const names[] = { "ahb1", "ahb2", "apb1", "apb2" }; 31 enum { AHB1, AHB2, APB1, APB2, PARENT_MAX } clk_parent; 32 const char *parents[PARENT_MAX]; 33 struct clk_onecell_data *clk_data; 34 const char *clk_name; 35 struct property *prop; 36 struct resource res; 37 void __iomem *clk_reg; 38 void __iomem *reg; 39 const __be32 *p; 40 int number, i; 41 u8 clk_bit; 42 int index; 43 44 reg = of_io_request_and_map(node, 0, of_node_full_name(node)); 45 if (IS_ERR(reg)) 46 return; 47 48 for (i = 0; i < ARRAY_SIZE(names); i++) { 49 int idx = of_property_match_string(node, "clock-names", 50 names[i]); 51 if (idx < 0) 52 return; 53 54 parents[i] = of_clk_get_parent_name(node, idx); 55 } 56 57 clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL); 58 if (!clk_data) 59 goto err_unmap; 60 61 number = of_property_count_u32_elems(node, "clock-indices"); 62 of_property_read_u32_index(node, "clock-indices", number - 1, &number); 63 64 clk_data->clks = kcalloc(number + 1, sizeof(struct clk *), GFP_KERNEL); 65 if (!clk_data->clks) 66 goto err_free_data; 67 68 i = 0; 69 of_property_for_each_u32(node, "clock-indices", prop, p, index) { 70 of_property_read_string_index(node, "clock-output-names", 71 i, &clk_name); 72 73 if (index == 17 || (index >= 29 && index <= 31)) 74 clk_parent = AHB2; 75 else if (index <= 63 || index >= 128) 76 clk_parent = AHB1; 77 else if (index >= 64 && index <= 95) 78 clk_parent = APB1; 79 else if (index >= 96 && index <= 127) 80 clk_parent = APB2; 81 82 clk_reg = reg + 4 * (index / 32); 83 clk_bit = index % 32; 84 85 clk_data->clks[index] = clk_register_gate(NULL, clk_name, 86 parents[clk_parent], 87 0, clk_reg, clk_bit, 88 0, &gates_lock); 89 i++; 90 91 if (IS_ERR(clk_data->clks[index])) { 92 WARN_ON(true); 93 continue; 94 } 95 } 96 97 clk_data->clk_num = number + 1; 98 of_clk_add_provider(node, of_clk_src_onecell_get, clk_data); 99 100 return; 101 102 err_free_data: 103 kfree(clk_data); 104 err_unmap: 105 iounmap(reg); 106 of_address_to_resource(node, 0, &res); 107 release_mem_region(res.start, resource_size(&res)); 108 } 109 110 CLK_OF_DECLARE(sun8i_h3_bus_gates, "allwinner,sun8i-h3-bus-gates-clk", 111 sun8i_h3_bus_gates_init); 112 CLK_OF_DECLARE(sun8i_a83t_bus_gates, "allwinner,sun8i-a83t-bus-gates-clk", 113 sun8i_h3_bus_gates_init); 114