LXR linux/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
  14static 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
  21static 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
  65err_free_gate:
  66        kfree(gate);
  67err_free_mux:
  68        kfree(mux);
  69err_unmap:
  70        iounmap(reg);
  71}
  72CLK_OF_DECLARE(sun4i_mod1, "allwinner,sun4i-a10-mod1-clk",
  73               sun4i_mod1_clk_setup);
  74