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/of.h> 19 #include <linux/of_address.h> 20 #include <linux/slab.h> 21 22 static DEFINE_SPINLOCK(mod1_lock); 23 24 #define SUN4I_MOD1_ENABLE 31 25 #define SUN4I_MOD1_MUX 16 26 #define SUN4I_MOD1_MUX_WIDTH 2 27 #define SUN4I_MOD1_MAX_PARENTS 4 28 29 static void __init sun4i_mod1_clk_setup(struct device_node *node) 30 { 31 struct clk *clk; 32 struct clk_mux *mux; 33 struct clk_gate *gate; 34 const char *parents[4]; 35 const char *clk_name = node->name; 36 void __iomem *reg; 37 int i; 38 39 reg = of_io_request_and_map(node, 0, of_node_full_name(node)); 40 if (IS_ERR(reg)) 41 return; 42 43 mux = kzalloc(sizeof(*mux), GFP_KERNEL); 44 if (!mux) 45 goto err_unmap; 46 47 gate = kzalloc(sizeof(*gate), GFP_KERNEL); 48 if (!gate) 49 goto err_free_mux; 50 51 of_property_read_string(node, "clock-output-names", &clk_name); 52 i = of_clk_parent_fill(node, parents, SUN4I_MOD1_MAX_PARENTS); 53 54 gate->reg = reg; 55 gate->bit_idx = SUN4I_MOD1_ENABLE; 56 gate->lock = &mod1_lock; 57 mux->reg = reg; 58 mux->shift = SUN4I_MOD1_MUX; 59 mux->mask = BIT(SUN4I_MOD1_MUX_WIDTH) - 1; 60 mux->lock = &mod1_lock; 61 62 clk = clk_register_composite(NULL, clk_name, parents, i, 63 &mux->hw, &clk_mux_ops, 64 NULL, NULL, 65 &gate->hw, &clk_gate_ops, 0); 66 if (IS_ERR(clk)) 67 goto err_free_gate; 68 69 of_clk_add_provider(node, of_clk_src_simple_get, clk); 70 71 return; 72 73 err_free_gate: 74 kfree(gate); 75 err_free_mux: 76 kfree(mux); 77 err_unmap: 78 iounmap(reg); 79 } 80 CLK_OF_DECLARE(sun4i_mod1, "allwinner,sun4i-a10-mod1-clk", 81 sun4i_mod1_clk_setup); 82