drivers/clk/sunxi/clk-sun4i-pll3.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-provider.h>
   9 #include <linux/io.h>
  10 #include <linux/of.h>
  11 #include <linux/of_address.h>
  12 #include <linux/slab.h>
  13 #include <linux/spinlock.h>
  14
  15 #define SUN4I_A10_PLL3_GATE_BIT 31
  16 #define SUN4I_A10_PLL3_DIV_WIDTH        7
  17 #define SUN4I_A10_PLL3_DIV_SHIFT        0
  18
  19 static DEFINE_SPINLOCK(sun4i_a10_pll3_lock);
  20
  21 static void __init sun4i_a10_pll3_setup(struct device_node *node)
  22 {
  23         const char *clk_name = node->name, *parent;
  24         struct clk_multiplier *mult;
  25         struct clk_gate *gate;
  26         struct resource res;
  27         void __iomem *reg;
  28         struct clk *clk;
  29         int ret;
  30
  31         of_property_read_string(node, "clock-output-names", &clk_name);
  32         parent = of_clk_get_parent_name(node, 0);
  33
  34         reg = of_io_request_and_map(node, 0, of_node_full_name(node));
  35         if (IS_ERR(reg)) {
  36                 pr_err("%s: Could not map the clock registers\n", clk_name);
  37                 return;
  38         }
  39
  40         gate = kzalloc(sizeof(*gate), GFP_KERNEL);
  41         if (!gate)
  42                 goto err_unmap;
  43
  44         gate->reg = reg;
  45         gate->bit_idx = SUN4I_A10_PLL3_GATE_BIT;
  46         gate->lock = &sun4i_a10_pll3_lock;
  47
  48         mult = kzalloc(sizeof(*mult), GFP_KERNEL);
  49         if (!mult)
  50                 goto err_free_gate;
  51
  52         mult->reg = reg;
  53         mult->shift = SUN4I_A10_PLL3_DIV_SHIFT;
  54         mult->width = SUN4I_A10_PLL3_DIV_WIDTH;
  55         mult->lock = &sun4i_a10_pll3_lock;
  56
  57         clk = clk_register_composite(NULL, clk_name,
  58                                      &parent, 1,
  59                                      NULL, NULL,
  60                                      &mult->hw, &clk_multiplier_ops,
  61                                      &gate->hw, &clk_gate_ops,
  62                                      0);
  63         if (IS_ERR(clk)) {
  64                 pr_err("%s: Couldn't register the clock\n", clk_name);
  65                 goto err_free_mult;
  66         }
  67
  68         ret = of_clk_add_provider(node, of_clk_src_simple_get, clk);
  69         if (ret) {
  70                 pr_err("%s: Couldn't register DT provider\n",
  71                        clk_name);
  72                 goto err_clk_unregister;
  73         }
  74
  75         return;
  76
  77 err_clk_unregister:
  78         clk_unregister_composite(clk);
  79 err_free_mult:
  80         kfree(mult);
  81 err_free_gate:
  82         kfree(gate);
  83 err_unmap:
  84         iounmap(reg);
  85         of_address_to_resource(node, 0, &res);
  86         release_mem_region(res.start, resource_size(&res));
  87 }
  88
  89 CLK_OF_DECLARE(sun4i_a10_pll3, "allwinner,sun4i-a10-pll3-clk",
  90                sun4i_a10_pll3_setup);