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); 91