/* * MOXA ART SoCs clock driver. * * Copyright (C) 2013 Jonas Jensen * * Jonas Jensen <jonas.jensen@gmail.com> * * This file is licensed under the terms of the GNU General Public * License version 2. This program is licensed "as is" without any * warranty of any kind, whether express or implied. */ #include <linux/clk.h> #include <linux/clk-provider.h> #include <linux/io.h> #include <linux/of_address.h> #include <linux/clkdev.h> static void __init moxart_of_pll_clk_init(struct device_node *node) { void __iomem *base; struct clk_hw *hw; struct clk *ref_clk; unsigned int mul; const char *name = node->name; const char *parent_name; of_property_read_string(node, "clock-output-names", &name); parent_name = of_clk_get_parent_name(node, 0); base = of_iomap(node, 0); if (!base) { pr_err("%pOF: of_iomap failed\n", node); return; } mul = readl(base + 0x30) >> 3 & 0x3f; iounmap(base); ref_clk = of_clk_get(node, 0); if (IS_ERR(ref_clk)) { pr_err("%pOF: of_clk_get failed\n", node); return; } hw = clk_hw_register_fixed_factor(NULL, name, parent_name, 0, mul, 1); if (IS_ERR(hw)) { pr_err("%pOF: failed to register clock\n", node); return; } clk_hw_register_clkdev(hw, NULL, name); of_clk_add_hw_provider(node, of_clk_hw_simple_get, hw); } CLK_OF_DECLARE(moxart_pll_clock, "moxa,moxart-pll-clock", moxart_of_pll_clk_init); static void __init moxart_of_apb_clk_init(struct device_node *node) { void __iomem *base; struct clk_hw *hw; struct clk *pll_clk; unsigned int div, val; unsigned int div_idx[] = { 2, 3, 4, 6, 8}; const char *name = node->name; const char *parent_name; of_property_read_string(node, "clock-output-names", &name); parent_name = of_clk_get_parent_name(node, 0); base = of_iomap(node, 0); if (!base) { pr_err("%pOF: of_iomap failed\n", node); return; } val = readl(base + 0xc) >> 4 & 0x7; iounmap(base); if (val > 4) val = 0; div = div_idx[val] * 2; pll_clk = of_clk_get(node, 0); if (IS_ERR(pll_clk)) { pr_err("%pOF: of_clk_get failed\n", node); return; } hw = clk_hw_register_fixed_factor(NULL, name, parent_name, 0, 1, div); if (IS_ERR(hw)) { pr_err("%pOF: failed to register clock\n", node); return; } clk_hw_register_clkdev(hw, NULL, name); of_clk_add_hw_provider(node, of_clk_hw_simple_get, hw); } CLK_OF_DECLARE(moxart_apb_clock, "moxa,moxart-apb-clock", moxart_of_apb_clk_init);