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

   1/*
   2 * Copyright 2013 Emilio López
   3 *
   4 * Emilio López <emilio@elopez.com.ar>
   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-provider.h>
  18#include <linux/of.h>
  19#include <linux/of_address.h>
  20#include <linux/slab.h>
  21
  22static DEFINE_SPINLOCK(mod1_lock);
  23
  24#define SUN4I_MOD1_ENABLE       31
  25#define SUN4I_MOD1_MUX          16
  26#define SUN4I_MOD1_MUX_WIDTH    2
  27#define SUN4I_MOD1_MAX_PARENTS  4
  28
  29static void __init sun4i_mod1_clk_setup(struct device_node *node)
  30{
  31        struct clk *clk;
  32        struct clk_mux *mux;
  33        struct clk_gate *gate;
  34        const char *parents[4];
  35        const char *clk_name = node->name;
  36        void __iomem *reg;
  37        int i;
  38
  39        reg = of_io_request_and_map(node, 0, of_node_full_name(node));
  40        if (IS_ERR(reg))
  41                return;
  42
  43        mux = kzalloc(sizeof(*mux), GFP_KERNEL);
  44        if (!mux)
  45                goto err_unmap;
  46
  47        gate = kzalloc(sizeof(*gate), GFP_KERNEL);
  48        if (!gate)
  49                goto err_free_mux;
  50
  51        of_property_read_string(node, "clock-output-names", &clk_name);
  52        i = of_clk_parent_fill(node, parents, SUN4I_MOD1_MAX_PARENTS);
  53
  54        gate->reg = reg;
  55        gate->bit_idx = SUN4I_MOD1_ENABLE;
  56        gate->lock = &mod1_lock;
  57        mux->reg = reg;
  58        mux->shift = SUN4I_MOD1_MUX;
  59        mux->mask = BIT(SUN4I_MOD1_MUX_WIDTH) - 1;
  60        mux->lock = &mod1_lock;
  61
  62        clk = clk_register_composite(NULL, clk_name, parents, i,
  63                                     &mux->hw, &clk_mux_ops,
  64                                     NULL, NULL,
  65                                     &gate->hw, &clk_gate_ops, CLK_SET_RATE_PARENT);
  66        if (IS_ERR(clk))
  67                goto err_free_gate;
  68
  69        of_clk_add_provider(node, of_clk_src_simple_get, clk);
  70
  71        return;
  72
  73err_free_gate:
  74        kfree(gate);
  75err_free_mux:
  76        kfree(mux);
  77err_unmap:
  78        iounmap(reg);
  79}
  80CLK_OF_DECLARE(sun4i_mod1, "allwinner,sun4i-a10-mod1-clk",
  81               sun4i_mod1_clk_setup);
  82