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Based on 2 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
448 lines
10 KiB
C
448 lines
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* drivers/clk/clkdev.c
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*
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* Copyright (C) 2008 Russell King.
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*
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* Helper for the clk API to assist looking up a struct clk.
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/list.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/string.h>
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#include <linux/mutex.h>
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#include <linux/clk.h>
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#include <linux/clkdev.h>
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#include <linux/clk-provider.h>
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#include <linux/of.h>
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#include "clk.h"
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static LIST_HEAD(clocks);
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static DEFINE_MUTEX(clocks_mutex);
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/*
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* Find the correct struct clk for the device and connection ID.
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* We do slightly fuzzy matching here:
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* An entry with a NULL ID is assumed to be a wildcard.
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* If an entry has a device ID, it must match
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* If an entry has a connection ID, it must match
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* Then we take the most specific entry - with the following
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* order of precedence: dev+con > dev only > con only.
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*/
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static struct clk_lookup *clk_find(const char *dev_id, const char *con_id)
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{
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struct clk_lookup *p, *cl = NULL;
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int match, best_found = 0, best_possible = 0;
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if (dev_id)
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best_possible += 2;
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if (con_id)
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best_possible += 1;
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lockdep_assert_held(&clocks_mutex);
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list_for_each_entry(p, &clocks, node) {
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match = 0;
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if (p->dev_id) {
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if (!dev_id || strcmp(p->dev_id, dev_id))
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continue;
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match += 2;
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}
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if (p->con_id) {
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if (!con_id || strcmp(p->con_id, con_id))
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continue;
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match += 1;
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}
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if (match > best_found) {
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cl = p;
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if (match != best_possible)
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best_found = match;
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else
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break;
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}
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}
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return cl;
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}
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struct clk_hw *clk_find_hw(const char *dev_id, const char *con_id)
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{
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struct clk_lookup *cl;
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struct clk_hw *hw = ERR_PTR(-ENOENT);
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mutex_lock(&clocks_mutex);
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cl = clk_find(dev_id, con_id);
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if (cl)
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hw = cl->clk_hw;
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mutex_unlock(&clocks_mutex);
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return hw;
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}
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static struct clk *__clk_get_sys(struct device *dev, const char *dev_id,
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const char *con_id)
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{
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struct clk_hw *hw = clk_find_hw(dev_id, con_id);
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return clk_hw_create_clk(dev, hw, dev_id, con_id);
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}
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struct clk *clk_get_sys(const char *dev_id, const char *con_id)
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{
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return __clk_get_sys(NULL, dev_id, con_id);
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}
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EXPORT_SYMBOL(clk_get_sys);
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struct clk *clk_get(struct device *dev, const char *con_id)
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{
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const char *dev_id = dev ? dev_name(dev) : NULL;
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struct clk_hw *hw;
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if (dev && dev->of_node) {
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hw = of_clk_get_hw(dev->of_node, 0, con_id);
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if (!IS_ERR(hw) || PTR_ERR(hw) == -EPROBE_DEFER)
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return clk_hw_create_clk(dev, hw, dev_id, con_id);
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}
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return __clk_get_sys(dev, dev_id, con_id);
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}
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EXPORT_SYMBOL(clk_get);
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void clk_put(struct clk *clk)
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{
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__clk_put(clk);
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}
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EXPORT_SYMBOL(clk_put);
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static void __clkdev_add(struct clk_lookup *cl)
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{
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mutex_lock(&clocks_mutex);
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list_add_tail(&cl->node, &clocks);
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mutex_unlock(&clocks_mutex);
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}
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void clkdev_add(struct clk_lookup *cl)
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{
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if (!cl->clk_hw)
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cl->clk_hw = __clk_get_hw(cl->clk);
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__clkdev_add(cl);
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}
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EXPORT_SYMBOL(clkdev_add);
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void clkdev_add_table(struct clk_lookup *cl, size_t num)
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{
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mutex_lock(&clocks_mutex);
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while (num--) {
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cl->clk_hw = __clk_get_hw(cl->clk);
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list_add_tail(&cl->node, &clocks);
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cl++;
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}
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mutex_unlock(&clocks_mutex);
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}
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#define MAX_DEV_ID 20
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#define MAX_CON_ID 16
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struct clk_lookup_alloc {
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struct clk_lookup cl;
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char dev_id[MAX_DEV_ID];
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char con_id[MAX_CON_ID];
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};
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static struct clk_lookup * __ref
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vclkdev_alloc(struct clk_hw *hw, const char *con_id, const char *dev_fmt,
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va_list ap)
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{
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struct clk_lookup_alloc *cla;
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cla = kzalloc(sizeof(*cla), GFP_KERNEL);
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if (!cla)
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return NULL;
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cla->cl.clk_hw = hw;
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if (con_id) {
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strlcpy(cla->con_id, con_id, sizeof(cla->con_id));
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cla->cl.con_id = cla->con_id;
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}
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if (dev_fmt) {
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vscnprintf(cla->dev_id, sizeof(cla->dev_id), dev_fmt, ap);
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cla->cl.dev_id = cla->dev_id;
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}
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return &cla->cl;
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}
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static struct clk_lookup *
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vclkdev_create(struct clk_hw *hw, const char *con_id, const char *dev_fmt,
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va_list ap)
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{
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struct clk_lookup *cl;
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cl = vclkdev_alloc(hw, con_id, dev_fmt, ap);
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if (cl)
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__clkdev_add(cl);
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return cl;
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}
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struct clk_lookup * __ref
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clkdev_alloc(struct clk *clk, const char *con_id, const char *dev_fmt, ...)
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{
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struct clk_lookup *cl;
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va_list ap;
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va_start(ap, dev_fmt);
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cl = vclkdev_alloc(__clk_get_hw(clk), con_id, dev_fmt, ap);
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va_end(ap);
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return cl;
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}
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EXPORT_SYMBOL(clkdev_alloc);
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struct clk_lookup *
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clkdev_hw_alloc(struct clk_hw *hw, const char *con_id, const char *dev_fmt, ...)
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{
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struct clk_lookup *cl;
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va_list ap;
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va_start(ap, dev_fmt);
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cl = vclkdev_alloc(hw, con_id, dev_fmt, ap);
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va_end(ap);
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return cl;
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}
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EXPORT_SYMBOL(clkdev_hw_alloc);
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/**
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* clkdev_create - allocate and add a clkdev lookup structure
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* @clk: struct clk to associate with all clk_lookups
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* @con_id: connection ID string on device
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* @dev_fmt: format string describing device name
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*
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* Returns a clk_lookup structure, which can be later unregistered and
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* freed.
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*/
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struct clk_lookup *clkdev_create(struct clk *clk, const char *con_id,
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const char *dev_fmt, ...)
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{
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struct clk_lookup *cl;
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va_list ap;
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va_start(ap, dev_fmt);
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cl = vclkdev_create(__clk_get_hw(clk), con_id, dev_fmt, ap);
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va_end(ap);
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return cl;
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}
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EXPORT_SYMBOL_GPL(clkdev_create);
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/**
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* clkdev_hw_create - allocate and add a clkdev lookup structure
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* @hw: struct clk_hw to associate with all clk_lookups
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* @con_id: connection ID string on device
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* @dev_fmt: format string describing device name
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*
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* Returns a clk_lookup structure, which can be later unregistered and
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* freed.
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*/
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struct clk_lookup *clkdev_hw_create(struct clk_hw *hw, const char *con_id,
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const char *dev_fmt, ...)
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{
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struct clk_lookup *cl;
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va_list ap;
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va_start(ap, dev_fmt);
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cl = vclkdev_create(hw, con_id, dev_fmt, ap);
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va_end(ap);
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return cl;
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}
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EXPORT_SYMBOL_GPL(clkdev_hw_create);
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int clk_add_alias(const char *alias, const char *alias_dev_name,
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const char *con_id, struct device *dev)
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{
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struct clk *r = clk_get(dev, con_id);
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struct clk_lookup *l;
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if (IS_ERR(r))
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return PTR_ERR(r);
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l = clkdev_create(r, alias, alias_dev_name ? "%s" : NULL,
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alias_dev_name);
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clk_put(r);
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return l ? 0 : -ENODEV;
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}
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EXPORT_SYMBOL(clk_add_alias);
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/*
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* clkdev_drop - remove a clock dynamically allocated
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*/
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void clkdev_drop(struct clk_lookup *cl)
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{
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mutex_lock(&clocks_mutex);
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list_del(&cl->node);
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mutex_unlock(&clocks_mutex);
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kfree(cl);
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}
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EXPORT_SYMBOL(clkdev_drop);
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static struct clk_lookup *__clk_register_clkdev(struct clk_hw *hw,
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const char *con_id,
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const char *dev_id, ...)
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{
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struct clk_lookup *cl;
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va_list ap;
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va_start(ap, dev_id);
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cl = vclkdev_create(hw, con_id, dev_id, ap);
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va_end(ap);
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return cl;
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}
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static int do_clk_register_clkdev(struct clk_hw *hw,
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struct clk_lookup **cl, const char *con_id, const char *dev_id)
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{
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if (IS_ERR(hw))
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return PTR_ERR(hw);
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/*
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* Since dev_id can be NULL, and NULL is handled specially, we must
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* pass it as either a NULL format string, or with "%s".
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*/
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if (dev_id)
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*cl = __clk_register_clkdev(hw, con_id, "%s", dev_id);
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else
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*cl = __clk_register_clkdev(hw, con_id, NULL);
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return *cl ? 0 : -ENOMEM;
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}
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/**
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* clk_register_clkdev - register one clock lookup for a struct clk
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* @clk: struct clk to associate with all clk_lookups
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* @con_id: connection ID string on device
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* @dev_id: string describing device name
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*
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* con_id or dev_id may be NULL as a wildcard, just as in the rest of
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* clkdev.
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*
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* To make things easier for mass registration, we detect error clks
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* from a previous clk_register() call, and return the error code for
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* those. This is to permit this function to be called immediately
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* after clk_register().
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*/
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int clk_register_clkdev(struct clk *clk, const char *con_id,
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const char *dev_id)
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{
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struct clk_lookup *cl;
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if (IS_ERR(clk))
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return PTR_ERR(clk);
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return do_clk_register_clkdev(__clk_get_hw(clk), &cl, con_id,
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dev_id);
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}
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EXPORT_SYMBOL(clk_register_clkdev);
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/**
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* clk_hw_register_clkdev - register one clock lookup for a struct clk_hw
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* @hw: struct clk_hw to associate with all clk_lookups
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* @con_id: connection ID string on device
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* @dev_id: format string describing device name
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*
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* con_id or dev_id may be NULL as a wildcard, just as in the rest of
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* clkdev.
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*
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* To make things easier for mass registration, we detect error clk_hws
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* from a previous clk_hw_register_*() call, and return the error code for
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* those. This is to permit this function to be called immediately
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* after clk_hw_register_*().
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*/
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int clk_hw_register_clkdev(struct clk_hw *hw, const char *con_id,
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const char *dev_id)
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{
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struct clk_lookup *cl;
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return do_clk_register_clkdev(hw, &cl, con_id, dev_id);
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}
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EXPORT_SYMBOL(clk_hw_register_clkdev);
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static void devm_clkdev_release(struct device *dev, void *res)
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{
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clkdev_drop(*(struct clk_lookup **)res);
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}
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static int devm_clk_match_clkdev(struct device *dev, void *res, void *data)
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{
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struct clk_lookup **l = res;
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return *l == data;
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}
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/**
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* devm_clk_release_clkdev - Resource managed clkdev lookup release
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* @dev: device this lookup is bound
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* @con_id: connection ID string on device
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* @dev_id: format string describing device name
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*
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* Drop the clkdev lookup created with devm_clk_hw_register_clkdev.
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* Normally this function will not need to be called and the resource
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* management code will ensure that the resource is freed.
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*/
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void devm_clk_release_clkdev(struct device *dev, const char *con_id,
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const char *dev_id)
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{
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struct clk_lookup *cl;
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int rval;
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mutex_lock(&clocks_mutex);
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cl = clk_find(dev_id, con_id);
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mutex_unlock(&clocks_mutex);
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WARN_ON(!cl);
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rval = devres_release(dev, devm_clkdev_release,
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devm_clk_match_clkdev, cl);
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WARN_ON(rval);
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}
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EXPORT_SYMBOL(devm_clk_release_clkdev);
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/**
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* devm_clk_hw_register_clkdev - managed clk lookup registration for clk_hw
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* @dev: device this lookup is bound
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* @hw: struct clk_hw to associate with all clk_lookups
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* @con_id: connection ID string on device
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* @dev_id: format string describing device name
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*
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* con_id or dev_id may be NULL as a wildcard, just as in the rest of
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* clkdev.
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*
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* To make things easier for mass registration, we detect error clk_hws
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* from a previous clk_hw_register_*() call, and return the error code for
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* those. This is to permit this function to be called immediately
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* after clk_hw_register_*().
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*/
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int devm_clk_hw_register_clkdev(struct device *dev, struct clk_hw *hw,
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const char *con_id, const char *dev_id)
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{
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int rval = -ENOMEM;
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struct clk_lookup **cl;
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cl = devres_alloc(devm_clkdev_release, sizeof(*cl), GFP_KERNEL);
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if (cl) {
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rval = do_clk_register_clkdev(hw, cl, con_id, dev_id);
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if (!rval)
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devres_add(dev, cl);
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else
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devres_free(cl);
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}
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return rval;
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}
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EXPORT_SYMBOL(devm_clk_hw_register_clkdev);
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