drivers/clk/sunxi/clk-simple-gates.c

   1 /*
   2  * Copyright 2015 Maxime Ripard
   3  *
   4  * Maxime Ripard <maxime.ripard@free-electrons.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 2 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  */
  16
  17 #include <linux/clk.h>
  18 #include <linux/clk-provider.h>
  19 #include <linux/of.h>
  20 #include <linux/of_address.h>
  21 #include <linux/slab.h>
  22 #include <linux/spinlock.h>
  23
  24 static DEFINE_SPINLOCK(gates_lock);
  25
  26 static void __init sunxi_simple_gates_setup(struct device_node *node,
  27                                             const int protected[],
  28                                             int nprotected)
  29 {
  30         struct clk_onecell_data *clk_data;
  31         const char *clk_parent, *clk_name;
  32         struct property *prop;
  33         struct resource res;
  34         void __iomem *clk_reg;
  35         void __iomem *reg;
  36         const __be32 *p;
  37         int number, i = 0, j;
  38         u8 clk_bit;
  39         u32 index;
  40
  41         reg = of_io_request_and_map(node, 0, of_node_full_name(node));
  42         if (IS_ERR(reg))
  43                 return;
  44
  45         clk_parent = of_clk_get_parent_name(node, 0);
  46
  47         clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL);
  48         if (!clk_data)
  49                 goto err_unmap;
  50
  51         number = of_property_count_u32_elems(node, "clock-indices");
  52         of_property_read_u32_index(node, "clock-indices", number - 1, &number);
  53
  54         clk_data->clks = kcalloc(number + 1, sizeof(struct clk *), GFP_KERNEL);
  55         if (!clk_data->clks)
  56                 goto err_free_data;
  57
  58         of_property_for_each_u32(node, "clock-indices", prop, p, index) {
  59                 of_property_read_string_index(node, "clock-output-names",
  60                                               i, &clk_name);
  61
  62                 clk_reg = reg + 4 * (index / 32);
  63                 clk_bit = index % 32;
  64
  65                 clk_data->clks[index] = clk_register_gate(NULL, clk_name,
  66                                                           clk_parent, 0,
  67                                                           clk_reg,
  68                                                           clk_bit,
  69                                                           0, &gates_lock);
  70                 i++;
  71
  72                 if (IS_ERR(clk_data->clks[index])) {
  73                         WARN_ON(true);
  74                         continue;
  75                 }
  76
  77                 for (j = 0; j < nprotected; j++)
  78                         if (protected[j] == index)
  79                                 clk_prepare_enable(clk_data->clks[index]);
  80
  81         }
  82
  83         clk_data->clk_num = number + 1;
  84         of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
  85
  86         return;
  87
  88 err_free_data:
  89         kfree(clk_data);
  90 err_unmap:
  91         iounmap(reg);
  92         of_address_to_resource(node, 0, &res);
  93         release_mem_region(res.start, resource_size(&res));
  94 }
  95
  96 static void __init sunxi_simple_gates_init(struct device_node *node)
  97 {
  98         sunxi_simple_gates_setup(node, NULL, 0);
  99 }
 100
 101 CLK_OF_DECLARE(sun4i_a10_apb0, "allwinner,sun4i-a10-apb0-gates-clk",
 102                sunxi_simple_gates_init);
 103 CLK_OF_DECLARE(sun4i_a10_apb1, "allwinner,sun4i-a10-apb1-gates-clk",
 104                sunxi_simple_gates_init);
 105 CLK_OF_DECLARE(sun4i_a10_axi, "allwinner,sun4i-a10-axi-gates-clk",
 106                sunxi_simple_gates_init);
 107 CLK_OF_DECLARE(sun5i_a10s_apb0, "allwinner,sun5i-a10s-apb0-gates-clk",
 108                sunxi_simple_gates_init);
 109 CLK_OF_DECLARE(sun5i_a10s_apb1, "allwinner,sun5i-a10s-apb1-gates-clk",
 110                sunxi_simple_gates_init);
 111 CLK_OF_DECLARE(sun5i_a13_apb0, "allwinner,sun5i-a13-apb0-gates-clk",
 112                sunxi_simple_gates_init);
 113 CLK_OF_DECLARE(sun5i_a13_apb1, "allwinner,sun5i-a13-apb1-gates-clk",
 114                sunxi_simple_gates_init);
 115 CLK_OF_DECLARE(sun6i_a31_ahb1, "allwinner,sun6i-a31-ahb1-gates-clk",
 116                sunxi_simple_gates_init);
 117 CLK_OF_DECLARE(sun6i_a31_apb1, "allwinner,sun6i-a31-apb1-gates-clk",
 118                sunxi_simple_gates_init);
 119 CLK_OF_DECLARE(sun6i_a31_apb2, "allwinner,sun6i-a31-apb2-gates-clk",
 120                sunxi_simple_gates_init);
 121 CLK_OF_DECLARE(sun7i_a20_apb0, "allwinner,sun7i-a20-apb0-gates-clk",
 122                sunxi_simple_gates_init);
 123 CLK_OF_DECLARE(sun7i_a20_apb1, "allwinner,sun7i-a20-apb1-gates-clk",
 124                sunxi_simple_gates_init);
 125 CLK_OF_DECLARE(sun8i_a23_ahb1, "allwinner,sun8i-a23-ahb1-gates-clk",
 126                sunxi_simple_gates_init);
 127 CLK_OF_DECLARE(sun8i_a23_apb1, "allwinner,sun8i-a23-apb1-gates-clk",
 128                sunxi_simple_gates_init);
 129 CLK_OF_DECLARE(sun8i_a23_apb2, "allwinner,sun8i-a23-apb2-gates-clk",
 130                sunxi_simple_gates_init);
 131 CLK_OF_DECLARE(sun8i_a33_ahb1, "allwinner,sun8i-a33-ahb1-gates-clk",
 132                sunxi_simple_gates_init);
 133 CLK_OF_DECLARE(sun9i_a80_ahb0, "allwinner,sun9i-a80-ahb0-gates-clk",
 134                sunxi_simple_gates_init);
 135 CLK_OF_DECLARE(sun9i_a80_ahb1, "allwinner,sun9i-a80-ahb1-gates-clk",
 136                sunxi_simple_gates_init);
 137 CLK_OF_DECLARE(sun9i_a80_ahb2, "allwinner,sun9i-a80-ahb2-gates-clk",
 138                sunxi_simple_gates_init);
 139 CLK_OF_DECLARE(sun9i_a80_apb0, "allwinner,sun9i-a80-apb0-gates-clk",
 140                sunxi_simple_gates_init);
 141 CLK_OF_DECLARE(sun9i_a80_apb1, "allwinner,sun9i-a80-apb1-gates-clk",
 142                sunxi_simple_gates_init);
 143
 144 static const int sun4i_a10_ahb_critical_clocks[] __initconst = {
 145         14,     /* ahb_sdram */
 146 };
 147
 148 static void __init sun4i_a10_ahb_init(struct device_node *node)
 149 {
 150         sunxi_simple_gates_setup(node, sun4i_a10_ahb_critical_clocks,
 151                                  ARRAY_SIZE(sun4i_a10_ahb_critical_clocks));
 152 }
 153 CLK_OF_DECLARE(sun4i_a10_ahb, "allwinner,sun4i-a10-ahb-gates-clk",
 154                sun4i_a10_ahb_init);
 155 CLK_OF_DECLARE(sun5i_a10s_ahb, "allwinner,sun5i-a10s-ahb-gates-clk",
 156                sun4i_a10_ahb_init);
 157 CLK_OF_DECLARE(sun5i_a13_ahb, "allwinner,sun5i-a13-ahb-gates-clk",
 158                sun4i_a10_ahb_init);
 159 CLK_OF_DECLARE(sun7i_a20_ahb, "allwinner,sun7i-a20-ahb-gates-clk",
 160                sun4i_a10_ahb_init);