/* * Copyright 2013 Emilio López * * Emilio López <emilio@elopez.com.ar> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/clk-provider.h> #include <linux/of.h> #include <linux/of_address.h> #include <linux/slab.h> static DEFINE_SPINLOCK(mod1_lock); #define SUN4I_MOD1_ENABLE 31 #define SUN4I_MOD1_MUX 16 #define SUN4I_MOD1_MUX_WIDTH 2 #define SUN4I_MOD1_MAX_PARENTS 4 static void __init sun4i_mod1_clk_setup(struct device_node *node) { struct clk *clk; struct clk_mux *mux; struct clk_gate *gate; const char *parents[4]; const char *clk_name = node->name; void __iomem *reg; int i; reg = of_io_request_and_map(node, 0, of_node_full_name(node)); if (IS_ERR(reg)) return; mux = kzalloc(sizeof(*mux), GFP_KERNEL); if (!mux) goto err_unmap; gate = kzalloc(sizeof(*gate), GFP_KERNEL); if (!gate) goto err_free_mux; of_property_read_string(node, "clock-output-names", &clk_name); i = of_clk_parent_fill(node, parents, SUN4I_MOD1_MAX_PARENTS); gate->reg = reg; gate->bit_idx = SUN4I_MOD1_ENABLE; gate->lock = &mod1_lock; mux->reg = reg; mux->shift = SUN4I_MOD1_MUX; mux->mask = BIT(SUN4I_MOD1_MUX_WIDTH) - 1; mux->lock = &mod1_lock; clk = clk_register_composite(NULL, clk_name, parents, i, &mux->hw, &clk_mux_ops, NULL, NULL, &gate->hw, &clk_gate_ops, CLK_SET_RATE_PARENT); if (IS_ERR(clk)) goto err_free_gate; of_clk_add_provider(node, of_clk_src_simple_get, clk); return; err_free_gate: kfree(gate); err_free_mux: kfree(mux); err_unmap: iounmap(reg); } CLK_OF_DECLARE(sun4i_mod1, "allwinner,sun4i-a10-mod1-clk", sun4i_mod1_clk_setup);