110 lines · c
1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * Copyright 2014 Chen-Yu Tsai4 *5 * Chen-Yu Tsai <wens@csie.org>6 */7 8#include <linux/clk.h>9#include <linux/clk-provider.h>10#include <linux/io.h>11#include <linux/slab.h>12#include <linux/spinlock.h>13#include <linux/of_address.h>14 15#define SUN8I_MBUS_ENABLE 3116#define SUN8I_MBUS_MUX_SHIFT 2417#define SUN8I_MBUS_MUX_MASK 0x318#define SUN8I_MBUS_DIV_SHIFT 019#define SUN8I_MBUS_DIV_WIDTH 320#define SUN8I_MBUS_MAX_PARENTS 421 22static DEFINE_SPINLOCK(sun8i_a23_mbus_lock);23 24static void __init sun8i_a23_mbus_setup(struct device_node *node)25{26 int num_parents = of_clk_get_parent_count(node);27 const char **parents;28 const char *clk_name = node->name;29 struct resource res;30 struct clk_divider *div;31 struct clk_gate *gate;32 struct clk_mux *mux;33 struct clk *clk;34 void __iomem *reg;35 int err;36 37 parents = kcalloc(num_parents, sizeof(*parents), GFP_KERNEL);38 if (!parents)39 return;40 41 reg = of_io_request_and_map(node, 0, of_node_full_name(node));42 if (IS_ERR(reg)) {43 pr_err("Could not get registers for sun8i-mbus-clk\n");44 goto err_free_parents;45 }46 47 div = kzalloc(sizeof(*div), GFP_KERNEL);48 if (!div)49 goto err_unmap;50 51 mux = kzalloc(sizeof(*mux), GFP_KERNEL);52 if (!mux)53 goto err_free_div;54 55 gate = kzalloc(sizeof(*gate), GFP_KERNEL);56 if (!gate)57 goto err_free_mux;58 59 of_property_read_string(node, "clock-output-names", &clk_name);60 of_clk_parent_fill(node, parents, num_parents);61 62 gate->reg = reg;63 gate->bit_idx = SUN8I_MBUS_ENABLE;64 gate->lock = &sun8i_a23_mbus_lock;65 66 div->reg = reg;67 div->shift = SUN8I_MBUS_DIV_SHIFT;68 div->width = SUN8I_MBUS_DIV_WIDTH;69 div->lock = &sun8i_a23_mbus_lock;70 71 mux->reg = reg;72 mux->shift = SUN8I_MBUS_MUX_SHIFT;73 mux->mask = SUN8I_MBUS_MUX_MASK;74 mux->lock = &sun8i_a23_mbus_lock;75 76 /* The MBUS clocks needs to be always enabled */77 clk = clk_register_composite(NULL, clk_name, parents, num_parents,78 &mux->hw, &clk_mux_ops,79 &div->hw, &clk_divider_ops,80 &gate->hw, &clk_gate_ops,81 CLK_IS_CRITICAL);82 if (IS_ERR(clk))83 goto err_free_gate;84 85 err = of_clk_add_provider(node, of_clk_src_simple_get, clk);86 if (err)87 goto err_unregister_clk;88 89 kfree(parents); /* parents is deep copied */90 91 return;92 93err_unregister_clk:94 /* TODO: The composite clock stuff will leak a bit here. */95 clk_unregister(clk);96err_free_gate:97 kfree(gate);98err_free_mux:99 kfree(mux);100err_free_div:101 kfree(div);102err_unmap:103 iounmap(reg);104 of_address_to_resource(node, 0, &res);105 release_mem_region(res.start, resource_size(&res));106err_free_parents:107 kfree(parents);108}109CLK_OF_DECLARE(sun8i_a23_mbus, "allwinner,sun8i-a23-mbus-clk", sun8i_a23_mbus_setup);110