319 lines
8.0 KiB
C
319 lines
8.0 KiB
C
/*
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* Copyright (c) 2013 Samsung Electronics Co., Ltd.
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* Copyright (c) 2013 Linaro Ltd.
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* Author: Thomas Abraham <thomas.ab@samsung.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This file includes utility functions to register clocks to common
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* clock framework for Samsung platforms.
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*/
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#include <linux/syscore_ops.h>
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#include "clk.h"
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static DEFINE_SPINLOCK(lock);
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static struct clk **clk_table;
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static void __iomem *reg_base;
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#ifdef CONFIG_OF
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static struct clk_onecell_data clk_data;
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#endif
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#ifdef CONFIG_PM_SLEEP
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static struct samsung_clk_reg_dump *reg_dump;
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static unsigned long nr_reg_dump;
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static int samsung_clk_suspend(void)
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{
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struct samsung_clk_reg_dump *rd = reg_dump;
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unsigned long i;
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for (i = 0; i < nr_reg_dump; i++, rd++)
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rd->value = __raw_readl(reg_base + rd->offset);
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return 0;
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}
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static void samsung_clk_resume(void)
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{
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struct samsung_clk_reg_dump *rd = reg_dump;
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unsigned long i;
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for (i = 0; i < nr_reg_dump; i++, rd++)
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__raw_writel(rd->value, reg_base + rd->offset);
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}
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static struct syscore_ops samsung_clk_syscore_ops = {
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.suspend = samsung_clk_suspend,
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.resume = samsung_clk_resume,
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};
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#endif /* CONFIG_PM_SLEEP */
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/* setup the essentials required to support clock lookup using ccf */
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void __init samsung_clk_init(struct device_node *np, void __iomem *base,
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unsigned long nr_clks, unsigned long *rdump,
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unsigned long nr_rdump, unsigned long *soc_rdump,
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unsigned long nr_soc_rdump)
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{
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reg_base = base;
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#ifdef CONFIG_PM_SLEEP
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if (rdump && nr_rdump) {
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unsigned int idx;
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reg_dump = kzalloc(sizeof(struct samsung_clk_reg_dump)
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* (nr_rdump + nr_soc_rdump), GFP_KERNEL);
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if (!reg_dump) {
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pr_err("%s: memory alloc for register dump failed\n",
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__func__);
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return;
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}
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for (idx = 0; idx < nr_rdump; idx++)
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reg_dump[idx].offset = rdump[idx];
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for (idx = 0; idx < nr_soc_rdump; idx++)
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reg_dump[nr_rdump + idx].offset = soc_rdump[idx];
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nr_reg_dump = nr_rdump + nr_soc_rdump;
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register_syscore_ops(&samsung_clk_syscore_ops);
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}
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#endif
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clk_table = kzalloc(sizeof(struct clk *) * nr_clks, GFP_KERNEL);
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if (!clk_table)
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panic("could not allocate clock lookup table\n");
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if (!np)
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return;
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#ifdef CONFIG_OF
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clk_data.clks = clk_table;
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clk_data.clk_num = nr_clks;
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of_clk_add_provider(np, of_clk_src_onecell_get, &clk_data);
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#endif
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}
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/* add a clock instance to the clock lookup table used for dt based lookup */
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void samsung_clk_add_lookup(struct clk *clk, unsigned int id)
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{
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if (clk_table && id)
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clk_table[id] = clk;
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}
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/* register a list of aliases */
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void __init samsung_clk_register_alias(struct samsung_clock_alias *list,
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unsigned int nr_clk)
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{
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struct clk *clk;
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unsigned int idx, ret;
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if (!clk_table) {
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pr_err("%s: clock table missing\n", __func__);
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return;
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}
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for (idx = 0; idx < nr_clk; idx++, list++) {
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if (!list->id) {
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pr_err("%s: clock id missing for index %d\n", __func__,
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idx);
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continue;
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}
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clk = clk_table[list->id];
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if (!clk) {
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pr_err("%s: failed to find clock %d\n", __func__,
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list->id);
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continue;
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}
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ret = clk_register_clkdev(clk, list->alias, list->dev_name);
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if (ret)
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pr_err("%s: failed to register lookup %s\n",
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__func__, list->alias);
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}
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}
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/* register a list of fixed clocks */
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void __init samsung_clk_register_fixed_rate(
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struct samsung_fixed_rate_clock *list, unsigned int nr_clk)
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{
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struct clk *clk;
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unsigned int idx, ret;
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for (idx = 0; idx < nr_clk; idx++, list++) {
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clk = clk_register_fixed_rate(NULL, list->name,
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list->parent_name, list->flags, list->fixed_rate);
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if (IS_ERR(clk)) {
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pr_err("%s: failed to register clock %s\n", __func__,
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list->name);
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continue;
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}
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samsung_clk_add_lookup(clk, list->id);
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/*
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* Unconditionally add a clock lookup for the fixed rate clocks.
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* There are not many of these on any of Samsung platforms.
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*/
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ret = clk_register_clkdev(clk, list->name, NULL);
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if (ret)
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pr_err("%s: failed to register clock lookup for %s",
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__func__, list->name);
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}
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}
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/* register a list of fixed factor clocks */
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void __init samsung_clk_register_fixed_factor(
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struct samsung_fixed_factor_clock *list, unsigned int nr_clk)
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{
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struct clk *clk;
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unsigned int idx;
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for (idx = 0; idx < nr_clk; idx++, list++) {
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clk = clk_register_fixed_factor(NULL, list->name,
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list->parent_name, list->flags, list->mult, list->div);
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if (IS_ERR(clk)) {
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pr_err("%s: failed to register clock %s\n", __func__,
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list->name);
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continue;
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}
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samsung_clk_add_lookup(clk, list->id);
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}
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}
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/* register a list of mux clocks */
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void __init samsung_clk_register_mux(struct samsung_mux_clock *list,
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unsigned int nr_clk)
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{
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struct clk *clk;
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unsigned int idx, ret;
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for (idx = 0; idx < nr_clk; idx++, list++) {
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clk = clk_register_mux(NULL, list->name, list->parent_names,
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list->num_parents, list->flags, reg_base + list->offset,
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list->shift, list->width, list->mux_flags, &lock);
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if (IS_ERR(clk)) {
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pr_err("%s: failed to register clock %s\n", __func__,
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list->name);
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continue;
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}
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samsung_clk_add_lookup(clk, list->id);
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/* register a clock lookup only if a clock alias is specified */
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if (list->alias) {
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ret = clk_register_clkdev(clk, list->alias,
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list->dev_name);
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if (ret)
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pr_err("%s: failed to register lookup %s\n",
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__func__, list->alias);
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}
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}
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}
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/* register a list of div clocks */
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void __init samsung_clk_register_div(struct samsung_div_clock *list,
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unsigned int nr_clk)
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{
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struct clk *clk;
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unsigned int idx, ret;
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for (idx = 0; idx < nr_clk; idx++, list++) {
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if (list->table)
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clk = clk_register_divider_table(NULL, list->name,
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list->parent_name, list->flags,
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reg_base + list->offset, list->shift,
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list->width, list->div_flags,
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list->table, &lock);
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else
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clk = clk_register_divider(NULL, list->name,
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list->parent_name, list->flags,
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reg_base + list->offset, list->shift,
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list->width, list->div_flags, &lock);
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if (IS_ERR(clk)) {
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pr_err("%s: failed to register clock %s\n", __func__,
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list->name);
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continue;
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}
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samsung_clk_add_lookup(clk, list->id);
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/* register a clock lookup only if a clock alias is specified */
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if (list->alias) {
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ret = clk_register_clkdev(clk, list->alias,
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list->dev_name);
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if (ret)
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pr_err("%s: failed to register lookup %s\n",
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__func__, list->alias);
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}
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}
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}
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/* register a list of gate clocks */
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void __init samsung_clk_register_gate(struct samsung_gate_clock *list,
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unsigned int nr_clk)
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{
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struct clk *clk;
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unsigned int idx, ret;
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for (idx = 0; idx < nr_clk; idx++, list++) {
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clk = clk_register_gate(NULL, list->name, list->parent_name,
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list->flags, reg_base + list->offset,
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list->bit_idx, list->gate_flags, &lock);
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if (IS_ERR(clk)) {
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pr_err("%s: failed to register clock %s\n", __func__,
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list->name);
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continue;
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}
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/* register a clock lookup only if a clock alias is specified */
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if (list->alias) {
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ret = clk_register_clkdev(clk, list->alias,
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list->dev_name);
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if (ret)
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pr_err("%s: failed to register lookup %s\n",
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__func__, list->alias);
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}
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samsung_clk_add_lookup(clk, list->id);
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}
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}
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/*
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* obtain the clock speed of all external fixed clock sources from device
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* tree and register it
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*/
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#ifdef CONFIG_OF
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void __init samsung_clk_of_register_fixed_ext(
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struct samsung_fixed_rate_clock *fixed_rate_clk,
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unsigned int nr_fixed_rate_clk,
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struct of_device_id *clk_matches)
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{
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const struct of_device_id *match;
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struct device_node *np;
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u32 freq;
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for_each_matching_node_and_match(np, clk_matches, &match) {
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if (of_property_read_u32(np, "clock-frequency", &freq))
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continue;
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fixed_rate_clk[(u32)match->data].fixed_rate = freq;
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}
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samsung_clk_register_fixed_rate(fixed_rate_clk, nr_fixed_rate_clk);
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}
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#endif
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/* utility function to get the rate of a specified clock */
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unsigned long _get_rate(const char *clk_name)
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{
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struct clk *clk;
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clk = __clk_lookup(clk_name);
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if (!clk) {
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pr_err("%s: could not find clock %s\n", __func__, clk_name);
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return 0;
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}
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return clk_get_rate(clk);
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}
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