| Heiko Stübner | 646572c | 2013-06-13 16:59:40 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (c) 2013 MundoReader S.L. |
| 3 | * Author: Heiko Stuebner <heiko@sntech.de> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
| 7 | * the Free Software Foundation; either version 2 of the License, or |
| 8 | * (at your option) any later version. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | */ |
| 15 | |
| 16 | #include <linux/clk-provider.h> |
| 17 | #include <linux/clkdev.h> |
| 18 | #include <linux/of.h> |
| 19 | #include <linux/of_address.h> |
| 20 | |
| 21 | static DEFINE_SPINLOCK(clk_lock); |
| 22 | |
| 23 | /* |
| 24 | * Gate clocks |
| 25 | */ |
| 26 | |
| 27 | static void __init rk2928_gate_clk_init(struct device_node *node, |
| 28 | void *data) |
| 29 | { |
| 30 | struct clk_onecell_data *clk_data; |
| 31 | const char *clk_parent; |
| 32 | const char *clk_name; |
| 33 | void __iomem *reg; |
| 34 | void __iomem *reg_idx; |
| 35 | int flags; |
| 36 | int qty; |
| 37 | int reg_bit; |
| 38 | int clkflags = CLK_SET_RATE_PARENT; |
| 39 | int i; |
| 40 | |
| 41 | qty = of_property_count_strings(node, "clock-output-names"); |
| 42 | if (qty < 0) { |
| 43 | pr_err("%s: error in clock-output-names %d\n", __func__, qty); |
| 44 | return; |
| 45 | } |
| 46 | |
| 47 | if (qty == 0) { |
| 48 | pr_info("%s: nothing to do\n", __func__); |
| 49 | return; |
| 50 | } |
| 51 | |
| 52 | reg = of_iomap(node, 0); |
| 53 | |
| 54 | clk_data = kzalloc(sizeof(struct clk_onecell_data), GFP_KERNEL); |
| 55 | if (!clk_data) |
| 56 | return; |
| 57 | |
| 58 | clk_data->clks = kzalloc(qty * sizeof(struct clk *), GFP_KERNEL); |
| 59 | if (!clk_data->clks) { |
| 60 | kfree(clk_data); |
| 61 | return; |
| 62 | } |
| 63 | |
| 64 | flags = CLK_GATE_HIWORD_MASK | CLK_GATE_SET_TO_DISABLE; |
| 65 | |
| 66 | for (i = 0; i < qty; i++) { |
| 67 | of_property_read_string_index(node, "clock-output-names", |
| 68 | i, &clk_name); |
| 69 | |
| 70 | /* ignore empty slots */ |
| 71 | if (!strcmp("reserved", clk_name)) |
| 72 | continue; |
| 73 | |
| 74 | clk_parent = of_clk_get_parent_name(node, i); |
| 75 | |
| 76 | /* keep all gates untouched for now */ |
| 77 | clkflags |= CLK_IGNORE_UNUSED; |
| 78 | |
| 79 | reg_idx = reg + (4 * (i / 16)); |
| 80 | reg_bit = (i % 16); |
| 81 | |
| 82 | clk_data->clks[i] = clk_register_gate(NULL, clk_name, |
| 83 | clk_parent, clkflags, |
| 84 | reg_idx, reg_bit, |
| 85 | flags, |
| 86 | &clk_lock); |
| 87 | WARN_ON(IS_ERR(clk_data->clks[i])); |
| 88 | } |
| 89 | |
| 90 | clk_data->clk_num = qty; |
| 91 | |
| 92 | of_clk_add_provider(node, of_clk_src_onecell_get, clk_data); |
| 93 | } |
| 94 | CLK_OF_DECLARE(rk2928_gate, "rockchip,rk2928-gate-clk", rk2928_gate_clk_init); |