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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright 2015 Maxime Ripard
   4  *
   5  * Maxime Ripard <maxime.ripard@free-electrons.com>
   6  */
   7
   8 #include <linux/clk.h>
   9 #include <linux/clk-provider.h>
  10 #include <linux/io.h>
  11 #include <linux/of.h>
  12 #include <linux/of_address.h>
  13 #include <linux/slab.h>
  14 #include <linux/spinlock.h>
  15
  16 static DEFINE_SPINLOCK(gates_lock);
  17
  18 static void __init sunxi_simple_gates_setup(struct device_node *node,
  19                                             const int protected[],
  20                                             int nprotected)
  21 {
  22         struct clk_onecell_data *clk_data;
  23         const char *clk_parent, *clk_name;
  24         struct property *prop;
  25         struct resource res;
  26         void __iomem *clk_reg;
  27         void __iomem *reg;
  28         const __be32 *p;
  29         int number, i = 0, j;
  30         u8 clk_bit;
  31         u32 index;
  32
  33         reg = of_io_request_and_map(node, 0, of_node_full_name(node));
  34         if (IS_ERR(reg))
  35                 return;
  36
  37         clk_parent = of_clk_get_parent_name(node, 0);
  38
  39         clk_data = kmalloc(sizeof(struct clk_onecell_data), GFP_KERNEL);
  40         if (!clk_data)
  41                 goto err_unmap;
  42
  43         number = of_property_count_u32_elems(node, "clock-indices");
  44         of_property_read_u32_index(node, "clock-indices", number - 1, &number);
  45
  46         clk_data->clks = kcalloc(number + 1, sizeof(struct clk *), GFP_KERNEL);
  47         if (!clk_data->clks)
  48                 goto err_free_data;
  49
  50         of_property_for_each_u32(node, "clock-indices", prop, p, index) {
  51                 of_property_read_string_index(node, "clock-output-names",
  52                                               i, &clk_name);
  53
  54                 clk_reg = reg + 4 * (index / 32);
  55                 clk_bit = index % 32;
  56
  57                 clk_data->clks[index] = clk_register_gate(NULL, clk_name,
  58                                                           clk_parent, 0,
  59                                                           clk_reg,
  60                                                           clk_bit,
  61                                                           0, &gates_lock);
  62                 i++;
  63
  64                 if (IS_ERR(clk_data->clks[index])) {
  65                         WARN_ON(true);
  66                         continue;
  67                 }
  68
  69                 for (j = 0; j < nprotected; j++)
  70                         if (protected[j] == index)
  71                                 clk_prepare_enable(clk_data->clks[index]);
  72
  73         }
  74
  75         clk_data->clk_num = number + 1;
  76         of_clk_add_provider(node, of_clk_src_onecell_get, clk_data);
  77
  78         return;
  79
  80 err_free_data:
  81         kfree(clk_data);
  82 err_unmap:
  83         iounmap(reg);
  84         of_address_to_resource(node, 0, &res);
  85         release_mem_region(res.start, resource_size(&res));
  86 }
  87
  88 static void __init sunxi_simple_gates_init(struct device_node *node)
  89 {
  90         sunxi_simple_gates_setup(node, NULL, 0);
  91 }
  92
  93 CLK_OF_DECLARE(sun4i_a10_gates, "allwinner,sun4i-a10-gates-clk",
  94                sunxi_simple_gates_init);
  95 CLK_OF_DECLARE(sun4i_a10_apb0, "allwinner,sun4i-a10-apb0-gates-clk",
  96                sunxi_simple_gates_init);
  97 CLK_OF_DECLARE(sun4i_a10_apb1, "allwinner,sun4i-a10-apb1-gates-clk",
  98                sunxi_simple_gates_init);
  99 CLK_OF_DECLARE(sun4i_a10_axi, "allwinner,sun4i-a10-axi-gates-clk",
 100                sunxi_simple_gates_init);
 101 CLK_OF_DECLARE(sun5i_a10s_apb0, "allwinner,sun5i-a10s-apb0-gates-clk",
 102                sunxi_simple_gates_init);
 103 CLK_OF_DECLARE(sun5i_a10s_apb1, "allwinner,sun5i-a10s-apb1-gates-clk",
 104                sunxi_simple_gates_init);
 105 CLK_OF_DECLARE(sun5i_a13_apb0, "allwinner,sun5i-a13-apb0-gates-clk",
 106                sunxi_simple_gates_init);
 107 CLK_OF_DECLARE(sun5i_a13_apb1, "allwinner,sun5i-a13-apb1-gates-clk",
 108                sunxi_simple_gates_init);
 109 CLK_OF_DECLARE(sun6i_a31_ahb1, "allwinner,sun6i-a31-ahb1-gates-clk",
 110                sunxi_simple_gates_init);
 111 CLK_OF_DECLARE(sun6i_a31_apb1, "allwinner,sun6i-a31-apb1-gates-clk",
 112                sunxi_simple_gates_init);
 113 CLK_OF_DECLARE(sun6i_a31_apb2, "allwinner,sun6i-a31-apb2-gates-clk",
 114                sunxi_simple_gates_init);
 115 CLK_OF_DECLARE(sun7i_a20_apb0, "allwinner,sun7i-a20-apb0-gates-clk",
 116                sunxi_simple_gates_init);
 117 CLK_OF_DECLARE(sun7i_a20_apb1, "allwinner,sun7i-a20-apb1-gates-clk",
 118                sunxi_simple_gates_init);
 119 CLK_OF_DECLARE(sun8i_a23_ahb1, "allwinner,sun8i-a23-ahb1-gates-clk",
 120                sunxi_simple_gates_init);
 121 CLK_OF_DECLARE(sun8i_a23_apb1, "allwinner,sun8i-a23-apb1-gates-clk",
 122                sunxi_simple_gates_init);
 123 CLK_OF_DECLARE(sun8i_a23_apb2, "allwinner,sun8i-a23-apb2-gates-clk",
 124                sunxi_simple_gates_init);
 125 CLK_OF_DECLARE(sun8i_a33_ahb1, "allwinner,sun8i-a33-ahb1-gates-clk",
 126                sunxi_simple_gates_init);
 127 CLK_OF_DECLARE(sun8i_a83t_apb0, "allwinner,sun8i-a83t-apb0-gates-clk",
 128                sunxi_simple_gates_init);
 129 CLK_OF_DECLARE(sun9i_a80_ahb0, "allwinner,sun9i-a80-ahb0-gates-clk",
 130                sunxi_simple_gates_init);
 131 CLK_OF_DECLARE(sun9i_a80_ahb1, "allwinner,sun9i-a80-ahb1-gates-clk",
 132                sunxi_simple_gates_init);
 133 CLK_OF_DECLARE(sun9i_a80_ahb2, "allwinner,sun9i-a80-ahb2-gates-clk",
 134                sunxi_simple_gates_init);
 135 CLK_OF_DECLARE(sun9i_a80_apb0, "allwinner,sun9i-a80-apb0-gates-clk",
 136                sunxi_simple_gates_init);
 137 CLK_OF_DECLARE(sun9i_a80_apb1, "allwinner,sun9i-a80-apb1-gates-clk",
 138                sunxi_simple_gates_init);
 139 CLK_OF_DECLARE(sun9i_a80_apbs, "allwinner,sun9i-a80-apbs-gates-clk",
 140                sunxi_simple_gates_init);
 141
 142 static const int sun4i_a10_ahb_critical_clocks[] __initconst = {
 143         14,     /* ahb_sdram */
 144 };
 145
 146 static void __init sun4i_a10_ahb_init(struct device_node *node)
 147 {
 148         sunxi_simple_gates_setup(node, sun4i_a10_ahb_critical_clocks,
 149                                  ARRAY_SIZE(sun4i_a10_ahb_critical_clocks));
 150 }
 151 CLK_OF_DECLARE(sun4i_a10_ahb, "allwinner,sun4i-a10-ahb-gates-clk",
 152                sun4i_a10_ahb_init);
 153 CLK_OF_DECLARE(sun5i_a10s_ahb, "allwinner,sun5i-a10s-ahb-gates-clk",
 154                sun4i_a10_ahb_init);
 155 CLK_OF_DECLARE(sun5i_a13_ahb, "allwinner,sun5i-a13-ahb-gates-clk",
 156                sun4i_a10_ahb_init);
 157 CLK_OF_DECLARE(sun7i_a20_ahb, "allwinner,sun7i-a20-ahb-gates-clk",
 158                sun4i_a10_ahb_init);
 159
 160 static const int sun4i_a10_dram_critical_clocks[] __initconst = {
 161         15,     /* dram_output */
 162 };
 163
 164 static void __init sun4i_a10_dram_init(struct device_node *node)
 165 {
 166         sunxi_simple_gates_setup(node, sun4i_a10_dram_critical_clocks,
 167                                  ARRAY_SIZE(sun4i_a10_dram_critical_clocks));
 168 }
 169 CLK_OF_DECLARE(sun4i_a10_dram, "allwinner,sun4i-a10-dram-gates-clk",
 170                sun4i_a10_dram_init);