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8d7a577d04
Consistent with other instances of samsung_clk_init, the check if ctx is NULL is redundant. The function currently does not return NULL. Signed-off-by: Aditya Pakki <pakki001@umn.edu> Link: https://lkml.kernel.org/r/20200121233349.28627-1-pakki001@umn.edu Acked-by: Chanwoo Choi <cw00.choi@samsung.com> Signed-off-by: Stephen Boyd <sboyd@kernel.org>
386 lines
10 KiB
C
386 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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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 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/slab.h>
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#include <linux/clkdev.h>
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#include <linux/clk.h>
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#include <linux/clk-provider.h>
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#include <linux/io.h>
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#include <linux/of_address.h>
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#include <linux/syscore_ops.h>
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#include "clk.h"
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static LIST_HEAD(clock_reg_cache_list);
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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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int i;
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ctx = kzalloc(struct_size(ctx, clk_data.hws, nr_clks), GFP_KERNEL);
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if (!ctx)
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panic("could not allocate clock provider context.\n");
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for (i = 0; i < nr_clks; ++i)
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ctx->clk_data.hws[i] = ERR_PTR(-ENOENT);
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ctx->reg_base = base;
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ctx->clk_data.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_hw_provider(np, of_clk_hw_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,
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struct clk_hw *clk_hw, unsigned int id)
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{
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if (id)
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ctx->clk_data.hws[id] = clk_hw;
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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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const struct samsung_clock_alias *list,
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unsigned int nr_clk)
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{
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struct clk_hw *clk_hw;
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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->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_hw = ctx->clk_data.hws[list->id];
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if (!clk_hw) {
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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_hw_register_clkdev(clk_hw, 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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/* 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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const struct samsung_fixed_rate_clock *list,
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unsigned int nr_clk)
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{
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struct clk_hw *clk_hw;
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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_hw = clk_hw_register_fixed_rate(ctx->dev, list->name,
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list->parent_name, list->flags, list->fixed_rate);
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if (IS_ERR(clk_hw)) {
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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_hw, 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_hw_register_clkdev(clk_hw, 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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const struct samsung_fixed_factor_clock *list, unsigned int nr_clk)
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{
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struct clk_hw *clk_hw;
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unsigned int idx;
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for (idx = 0; idx < nr_clk; idx++, list++) {
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clk_hw = clk_hw_register_fixed_factor(ctx->dev, list->name,
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list->parent_name, list->flags, list->mult, list->div);
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if (IS_ERR(clk_hw)) {
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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_hw, 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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const struct samsung_mux_clock *list,
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unsigned int nr_clk)
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{
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struct clk_hw *clk_hw;
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unsigned int idx;
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for (idx = 0; idx < nr_clk; idx++, list++) {
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clk_hw = clk_hw_register_mux(ctx->dev, list->name,
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list->parent_names, 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_hw)) {
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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_hw, list->id);
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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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const struct samsung_div_clock *list,
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unsigned int nr_clk)
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{
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struct clk_hw *clk_hw;
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unsigned int idx;
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for (idx = 0; idx < nr_clk; idx++, list++) {
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if (list->table)
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clk_hw = clk_hw_register_divider_table(ctx->dev,
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list->name, 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_hw = clk_hw_register_divider(ctx->dev, 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_hw)) {
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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_hw, list->id);
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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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const struct samsung_gate_clock *list,
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unsigned int nr_clk)
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{
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struct clk_hw *clk_hw;
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unsigned int idx;
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for (idx = 0; idx < nr_clk; idx++, list++) {
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clk_hw = clk_hw_register_gate(ctx->dev, 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_hw)) {
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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_hw, 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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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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/* 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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#ifdef CONFIG_PM_SLEEP
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static int samsung_clk_suspend(void)
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{
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struct samsung_clock_reg_cache *reg_cache;
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list_for_each_entry(reg_cache, &clock_reg_cache_list, node) {
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samsung_clk_save(reg_cache->reg_base, reg_cache->rdump,
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reg_cache->rd_num);
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samsung_clk_restore(reg_cache->reg_base, reg_cache->rsuspend,
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reg_cache->rsuspend_num);
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}
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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_clock_reg_cache *reg_cache;
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list_for_each_entry(reg_cache, &clock_reg_cache_list, node)
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samsung_clk_restore(reg_cache->reg_base, reg_cache->rdump,
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reg_cache->rd_num);
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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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void samsung_clk_extended_sleep_init(void __iomem *reg_base,
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const unsigned long *rdump,
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unsigned long nr_rdump,
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const struct samsung_clk_reg_dump *rsuspend,
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unsigned long nr_rsuspend)
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{
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struct samsung_clock_reg_cache *reg_cache;
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reg_cache = kzalloc(sizeof(struct samsung_clock_reg_cache),
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GFP_KERNEL);
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if (!reg_cache)
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panic("could not allocate register reg_cache.\n");
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reg_cache->rdump = samsung_clk_alloc_reg_dump(rdump, nr_rdump);
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if (!reg_cache->rdump)
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panic("could not allocate register dump storage.\n");
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if (list_empty(&clock_reg_cache_list))
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register_syscore_ops(&samsung_clk_syscore_ops);
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reg_cache->reg_base = reg_base;
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reg_cache->rd_num = nr_rdump;
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reg_cache->rsuspend = rsuspend;
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reg_cache->rsuspend_num = nr_rsuspend;
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list_add_tail(®_cache->node, &clock_reg_cache_list);
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}
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#endif
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/*
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* Common function which registers plls, muxes, dividers and gates
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* for each CMU. It also add CMU register list to register cache.
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*/
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struct samsung_clk_provider * __init samsung_cmu_register_one(
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struct device_node *np,
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const struct samsung_cmu_info *cmu)
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{
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void __iomem *reg_base;
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struct samsung_clk_provider *ctx;
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reg_base = of_iomap(np, 0);
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if (!reg_base) {
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panic("%s: failed to map registers\n", __func__);
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return NULL;
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}
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ctx = samsung_clk_init(np, reg_base, cmu->nr_clk_ids);
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if (cmu->pll_clks)
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samsung_clk_register_pll(ctx, cmu->pll_clks, cmu->nr_pll_clks,
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reg_base);
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if (cmu->mux_clks)
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samsung_clk_register_mux(ctx, cmu->mux_clks,
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cmu->nr_mux_clks);
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if (cmu->div_clks)
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samsung_clk_register_div(ctx, cmu->div_clks, cmu->nr_div_clks);
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if (cmu->gate_clks)
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samsung_clk_register_gate(ctx, cmu->gate_clks,
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cmu->nr_gate_clks);
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if (cmu->fixed_clks)
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samsung_clk_register_fixed_rate(ctx, cmu->fixed_clks,
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cmu->nr_fixed_clks);
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if (cmu->fixed_factor_clks)
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samsung_clk_register_fixed_factor(ctx, cmu->fixed_factor_clks,
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cmu->nr_fixed_factor_clks);
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if (cmu->clk_regs)
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samsung_clk_extended_sleep_init(reg_base,
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cmu->clk_regs, cmu->nr_clk_regs,
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cmu->suspend_regs, cmu->nr_suspend_regs);
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samsung_clk_of_add_provider(np, ctx);
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return ctx;
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}
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