drivers/clk/sunxi/clk-a10-mod1.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright 2013 Emilio López
   4  *
   5  * Emilio López <emilio@elopez.com.ar>
   6  */
   7
   8 #include <linux/clk-provider.h>
   9 #include <linux/io.h>
  10 #include <linux/of.h>
  11 #include <linux/of_address.h>
  12 #include <linux/slab.h>
  13
  14 static DEFINE_SPINLOCK(mod1_lock);
  15
  16 #define SUN4I_MOD1_ENABLE       31
  17 #define SUN4I_MOD1_MUX          16
  18 #define SUN4I_MOD1_MUX_WIDTH    2
  19 #define SUN4I_MOD1_MAX_PARENTS  4
  20
  21 static void __init sun4i_mod1_clk_setup(struct device_node *node)
  22 {
  23         struct clk *clk;
  24         struct clk_mux *mux;
  25         struct clk_gate *gate;
  26         const char *parents[4];
  27         const char *clk_name = node->name;
  28         void __iomem *reg;
  29         int i;
  30
  31         reg = of_io_request_and_map(node, 0, of_node_full_name(node));
  32         if (IS_ERR(reg))
  33                 return;
  34
  35         mux = kzalloc(sizeof(*mux), GFP_KERNEL);
  36         if (!mux)
  37                 goto err_unmap;
  38
  39         gate = kzalloc(sizeof(*gate), GFP_KERNEL);
  40         if (!gate)
  41                 goto err_free_mux;
  42
  43         of_property_read_string(node, "clock-output-names", &clk_name);
  44         i = of_clk_parent_fill(node, parents, SUN4I_MOD1_MAX_PARENTS);
  45
  46         gate->reg = reg;
  47         gate->bit_idx = SUN4I_MOD1_ENABLE;
  48         gate->lock = &mod1_lock;
  49         mux->reg = reg;
  50         mux->shift = SUN4I_MOD1_MUX;
  51         mux->mask = BIT(SUN4I_MOD1_MUX_WIDTH) - 1;
  52         mux->lock = &mod1_lock;
  53
  54         clk = clk_register_composite(NULL, clk_name, parents, i,
  55                                      &mux->hw, &clk_mux_ops,
  56                                      NULL, NULL,
  57                                      &gate->hw, &clk_gate_ops, CLK_SET_RATE_PARENT);
  58         if (IS_ERR(clk))
  59                 goto err_free_gate;
  60
  61         of_clk_add_provider(node, of_clk_src_simple_get, clk);
  62
  63         return;
  64
  65 err_free_gate:
  66         kfree(gate);
  67 err_free_mux:
  68         kfree(mux);
  69 err_unmap:
  70         iounmap(reg);
  71 }
  72 CLK_OF_DECLARE(sun4i_mod1, "allwinner,sun4i-a10-mod1-clk",
  73                sun4i_mod1_clk_setup);