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976face4b4
Samsung CCF helper functions do not provide support to register multiple Clock Providers for a given SoC. Due to this limitation, SoC platforms are not able to use these helpers for registering multiple clock providers and are forced to bypass this layer. This layer is modified accordingly to enable the support for multiple clock providers. Clock file for exynos4, exynos5250, exynos5420, exynos5440, S3c64xx, S3c24xx are also modified as per changed helper functions. Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com> [t.figa: Modified s3c2410 clock driver as well] Signed-off-by: Tomasz Figa <t.figa@samsung.com>
310 lines
8 KiB
C
310 lines
8 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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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 ret;
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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 = 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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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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if (!np)
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return ctx;
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ret = of_clk_add_provider(np, of_clk_src_onecell_get,
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&ctx->clk_data);
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if (ret)
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panic("could not register clock provide\n");
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return ctx;
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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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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[(u32)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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