mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-05 15:36:42 +07:00
9388093db4
Unlike clk_register_clkdev(), clk_hw_register_clkdev() doesn't check for passed error objects from a previous registration call. Hence the caller of clk_hw_register_*() has to check for errors before calling clk_hw_register_clkdev*(). Make clk_hw_register_clkdev() more similar to clk_register_clkdev() by adding this error check, removing the burden from callers that do mass registration. Fixes:e4f1b49bda
("clkdev: Add clk_hw based registration APIs") Fixes:944b9a41e0
("clk: ls1x: Migrate to clk_hw based OF and registration APIs") Fixes:44ce9a9ae9
("MIPS: TXx9: Convert to Common Clock Framework") Fixes:f48d947a16
("clk: clps711x: Migrate to clk_hw based OF and registration APIs") Fixes:b4626a7f48
("CLK: Add Loongson1C clock support") Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
477 lines
11 KiB
C
477 lines
11 KiB
C
/*
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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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* 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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* 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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#if defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK)
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static struct clk *__of_clk_get(struct device_node *np, int index,
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const char *dev_id, const char *con_id)
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{
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struct of_phandle_args clkspec;
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struct clk *clk;
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int rc;
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if (index < 0)
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return ERR_PTR(-EINVAL);
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rc = of_parse_phandle_with_args(np, "clocks", "#clock-cells", index,
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&clkspec);
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if (rc)
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return ERR_PTR(rc);
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clk = __of_clk_get_from_provider(&clkspec, dev_id, con_id);
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of_node_put(clkspec.np);
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return clk;
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}
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struct clk *of_clk_get(struct device_node *np, int index)
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{
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return __of_clk_get(np, index, np->full_name, NULL);
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}
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EXPORT_SYMBOL(of_clk_get);
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static struct clk *__of_clk_get_by_name(struct device_node *np,
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const char *dev_id,
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const char *name)
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{
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struct clk *clk = ERR_PTR(-ENOENT);
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/* Walk up the tree of devices looking for a clock that matches */
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while (np) {
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int index = 0;
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/*
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* For named clocks, first look up the name in the
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* "clock-names" property. If it cannot be found, then
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* index will be an error code, and of_clk_get() will fail.
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*/
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if (name)
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index = of_property_match_string(np, "clock-names", name);
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clk = __of_clk_get(np, index, dev_id, name);
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if (!IS_ERR(clk)) {
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break;
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} else if (name && index >= 0) {
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if (PTR_ERR(clk) != -EPROBE_DEFER)
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pr_err("ERROR: could not get clock %s:%s(%i)\n",
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np->full_name, name ? name : "", index);
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return clk;
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}
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/*
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* No matching clock found on this node. If the parent node
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* has a "clock-ranges" property, then we can try one of its
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* clocks.
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*/
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np = np->parent;
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if (np && !of_get_property(np, "clock-ranges", NULL))
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break;
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}
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return clk;
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}
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/**
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* of_clk_get_by_name() - Parse and lookup a clock referenced by a device node
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* @np: pointer to clock consumer node
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* @name: name of consumer's clock input, or NULL for the first clock reference
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*
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* This function parses the clocks and clock-names properties,
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* and uses them to look up the struct clk from the registered list of clock
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* providers.
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*/
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struct clk *of_clk_get_by_name(struct device_node *np, const char *name)
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{
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if (!np)
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return ERR_PTR(-ENOENT);
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return __of_clk_get_by_name(np, np->full_name, name);
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}
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EXPORT_SYMBOL(of_clk_get_by_name);
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#else /* defined(CONFIG_OF) && defined(CONFIG_COMMON_CLK) */
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static struct clk *__of_clk_get_by_name(struct device_node *np,
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const char *dev_id,
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const char *name)
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{
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return ERR_PTR(-ENOENT);
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}
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#endif
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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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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 *clk_get_sys(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 *clk = NULL;
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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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goto out;
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clk = __clk_create_clk(cl->clk_hw, dev_id, con_id);
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if (IS_ERR(clk))
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goto out;
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if (!__clk_get(clk)) {
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__clk_free_clk(clk);
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cl = NULL;
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goto out;
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}
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out:
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mutex_unlock(&clocks_mutex);
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return cl ? clk : ERR_PTR(-ENOENT);
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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 *clk;
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if (dev) {
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clk = __of_clk_get_by_name(dev->of_node, dev_id, con_id);
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if (!IS_ERR(clk) || PTR_ERR(clk) == -EPROBE_DEFER)
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return clk;
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}
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return clk_get_sys(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 = __clkdev_alloc(sizeof(*cla));
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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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/**
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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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/*
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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(__clk_get_hw(clk), con_id, "%s",
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dev_id);
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else
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cl = __clk_register_clkdev(__clk_get_hw(clk), con_id, NULL);
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return cl ? 0 : -ENOMEM;
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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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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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EXPORT_SYMBOL(clk_hw_register_clkdev);
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