1 /* 2 * Copyright 2013 Emilio López 3 * 4 * Emilio López <emilio@elopez.com.ar> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 * 11 * This program is distributed in the hope that it will be useful, 12 * but WITHOUT ANY WARRANTY; without even the implied warranty of 13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 * GNU General Public License for more details. 15 */ 16 17 #include <linux/clk-provider.h> 18 #include <linux/io.h> 19 #include <linux/of.h> 20 #include <linux/of_address.h> 21 #include <linux/slab.h> 22 23 static DEFINE_SPINLOCK(mod1_lock); 24 25 #define SUN4I_MOD1_ENABLE 31 26 #define SUN4I_MOD1_MUX 16 27 #define SUN4I_MOD1_MUX_WIDTH 2 28 #define SUN4I_MOD1_MAX_PARENTS 4 29 30 static void __init sun4i_mod1_clk_setup(struct device_node *node) 31 { 32 struct clk *clk; 33 struct clk_mux *mux; 34 struct clk_gate *gate; 35 const char *parents[4]; 36 const char *clk_name = node->name; 37 void __iomem *reg; 38 int i; 39 40 reg = of_io_request_and_map(node, 0, of_node_full_name(node)); 41 if (IS_ERR(reg)) 42 return; 43 44 mux = kzalloc(sizeof(*mux), GFP_KERNEL); 45 if (!mux) 46 goto err_unmap; 47 48 gate = kzalloc(sizeof(*gate), GFP_KERNEL); 49 if (!gate) 50 goto err_free_mux; 51 52 of_property_read_string(node, "clock-output-names", &clk_name); 53 i = of_clk_parent_fill(node, parents, SUN4I_MOD1_MAX_PARENTS); 54 55 gate->reg = reg; 56 gate->bit_idx = SUN4I_MOD1_ENABLE; 57 gate->lock = &mod1_lock; 58 mux->reg = reg; 59 mux->shift = SUN4I_MOD1_MUX; 60 mux->mask = BIT(SUN4I_MOD1_MUX_WIDTH) - 1; 61 mux->lock = &mod1_lock; 62 63 clk = clk_register_composite(NULL, clk_name, parents, i, 64 &mux->hw, &clk_mux_ops, 65 NULL, NULL, 66 &gate->hw, &clk_gate_ops, CLK_SET_RATE_PARENT); 67 if (IS_ERR(clk)) 68 goto err_free_gate; 69 70 of_clk_add_provider(node, of_clk_src_simple_get, clk); 71 72 return; 73 74 err_free_gate: 75 kfree(gate); 76 err_free_mux: 77 kfree(mux); 78 err_unmap: 79 iounmap(reg); 80 } 81 CLK_OF_DECLARE(sun4i_mod1, "allwinner,sun4i-a10-mod1-clk", 82 sun4i_mod1_clk_setup); 83