316 lines
8.2 KiB
C
316 lines
8.2 KiB
C
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/*
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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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void samsung_clk_save(void __iomem *base,
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struct samsung_clk_reg_dump *rd,
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unsigned int num_regs)
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{
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for (; num_regs > 0; --num_regs, ++rd)
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rd->value = readl(base + rd->offset);
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}
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void samsung_clk_restore(void __iomem *base,
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const struct samsung_clk_reg_dump *rd,
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unsigned int num_regs)
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{
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for (; num_regs > 0; --num_regs, ++rd)
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writel(rd->value, base + rd->offset);
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}
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struct samsung_clk_reg_dump *samsung_clk_alloc_reg_dump(
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const unsigned long *rdump,
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unsigned long nr_rdump)
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{
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struct samsung_clk_reg_dump *rd;
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unsigned int i;
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rd = kcalloc(nr_rdump, sizeof(*rd), GFP_KERNEL);
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if (!rd)
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return NULL;
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for (i = 0; i < nr_rdump; ++i)
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rd[i].offset = rdump[i];
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return rd;
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}
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/* setup the essentials required to support clock lookup using ccf */
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struct samsung_clk_provider *__init samsung_clk_init(struct device_node *np,
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void __iomem *base, unsigned long nr_clks)
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{
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struct samsung_clk_provider *ctx;
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struct clk **clk_table;
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int i;
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ctx = kzalloc(sizeof(struct samsung_clk_provider), GFP_KERNEL);
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if (!ctx)
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panic("could not allocate clock provider context.\n");
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clk_table = kcalloc(nr_clks, sizeof(struct clk *), 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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for (i = 0; i < nr_clks; ++i)
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clk_table[i] = ERR_PTR(-ENOENT);
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ctx->reg_base = base;
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ctx->clk_data.clks = clk_table;
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ctx->clk_data.clk_num = nr_clks;
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spin_lock_init(&ctx->lock);
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return ctx;
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}
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void __init samsung_clk_of_add_provider(struct device_node *np,
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struct samsung_clk_provider *ctx)
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{
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if (np) {
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if (of_clk_add_provider(np, of_clk_src_onecell_get,
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&ctx->clk_data))
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panic("could not register clk provider\n");
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}
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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 samsung_clk_provider *ctx, struct clk *clk,
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unsigned int id)
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{
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if (ctx->clk_data.clks && id)
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ctx->clk_data.clks[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_clk_provider *ctx,
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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 (!ctx->clk_data.clks) {
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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 = ctx->clk_data.clks[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(struct samsung_clk_provider *ctx,
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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(ctx, 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(struct samsung_clk_provider *ctx,
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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(ctx, 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_clk_provider *ctx,
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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,
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ctx->reg_base + list->offset,
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list->shift, list->width, list->mux_flags, &ctx->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(ctx, 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_clk_provider *ctx,
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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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ctx->reg_base + list->offset,
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list->shift, list->width, list->div_flags,
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list->table, &ctx->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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ctx->reg_base + list->offset, list->shift,
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list->width, list->div_flags, &ctx->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(ctx, 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_clk_provider *ctx,
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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, ctx->reg_base + list->offset,
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list->bit_idx, list->gate_flags, &ctx->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(ctx, 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(struct samsung_clk_provider *ctx,
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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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const 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 *clk_np;
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u32 freq;
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for_each_matching_node_and_match(clk_np, clk_matches, &match) {
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if (of_property_read_u32(clk_np, "clock-frequency", &freq))
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continue;
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fixed_rate_clk[(unsigned long)match->data].fixed_rate = freq;
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}
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samsung_clk_register_fixed_rate(ctx, 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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