diff options
Diffstat (limited to 'kernel/drivers/clk/rockchip/clk-rockchip.c')
-rw-r--r-- | kernel/drivers/clk/rockchip/clk-rockchip.c | 93 |
1 files changed, 93 insertions, 0 deletions
diff --git a/kernel/drivers/clk/rockchip/clk-rockchip.c b/kernel/drivers/clk/rockchip/clk-rockchip.c new file mode 100644 index 000000000..4cf838d52 --- /dev/null +++ b/kernel/drivers/clk/rockchip/clk-rockchip.c @@ -0,0 +1,93 @@ +/* + * Copyright (c) 2013 MundoReader S.L. + * Author: Heiko Stuebner <heiko@sntech.de> + * + * 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/clkdev.h> +#include <linux/of.h> +#include <linux/of_address.h> + +static DEFINE_SPINLOCK(clk_lock); + +/* + * Gate clocks + */ + +static void __init rk2928_gate_clk_init(struct device_node *node) +{ + struct clk_onecell_data *clk_data; + const char *clk_parent; + const char *clk_name; + void __iomem *reg; + void __iomem *reg_idx; + int flags; + int qty; + int reg_bit; + int clkflags = CLK_SET_RATE_PARENT; + int i; + + qty = of_property_count_strings(node, "clock-output-names"); + if (qty < 0) { + pr_err("%s: error in clock-output-names %d\n", __func__, qty); + return; + } + + if (qty == 0) { + pr_info("%s: nothing to do\n", __func__); + return; + } + + reg = of_iomap(node, 0); + + clk_data = kzalloc(sizeof(struct clk_onecell_data), GFP_KERNEL); + if (!clk_data) + return; + + clk_data->clks = kzalloc(qty * sizeof(struct clk *), GFP_KERNEL); + if (!clk_data->clks) { + kfree(clk_data); + return; + } + + flags = CLK_GATE_HIWORD_MASK | CLK_GATE_SET_TO_DISABLE; + + for (i = 0; i < qty; i++) { + of_property_read_string_index(node, "clock-output-names", + i, &clk_name); + + /* ignore empty slots */ + if (!strcmp("reserved", clk_name)) + continue; + + clk_parent = of_clk_get_parent_name(node, i); + + /* keep all gates untouched for now */ + clkflags |= CLK_IGNORE_UNUSED; + + reg_idx = reg + (4 * (i / 16)); + reg_bit = (i % 16); + + clk_data->clks[i] = clk_register_gate(NULL, clk_name, + clk_parent, clkflags, + reg_idx, reg_bit, + flags, + &clk_lock); + WARN_ON(IS_ERR(clk_data->clks[i])); + } + + clk_data->clk_num = qty; + + of_clk_add_provider(node, of_clk_src_onecell_get, clk_data); +} +CLK_OF_DECLARE(rk2928_gate, "rockchip,rk2928-gate-clk", rk2928_gate_clk_init); |