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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e9d7f40654
The common clock framework allocates clocks dynamically. Provide a set of helpers to streamline the clkdev registration of the clock lookups to avoid repetitive code sequences. Reviewed-by: Viresh Kumar <viresh.kumar@st.com> Tested-by: Shawn Guo <shawn.guo@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
298 lines
6.3 KiB
C
298 lines
6.3 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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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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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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mutex_lock(&clocks_mutex);
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cl = clk_find(dev_id, con_id);
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if (cl && !__clk_get(cl->clk))
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cl = NULL;
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mutex_unlock(&clocks_mutex);
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return cl ? 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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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 devm_clk_release(struct device *dev, void *res)
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{
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clk_put(*(struct clk **)res);
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}
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struct clk *devm_clk_get(struct device *dev, const char *id)
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{
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struct clk **ptr, *clk;
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ptr = devres_alloc(devm_clk_release, sizeof(*ptr), GFP_KERNEL);
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if (!ptr)
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return ERR_PTR(-ENOMEM);
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clk = clk_get(dev, id);
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if (!IS_ERR(clk)) {
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*ptr = clk;
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devres_add(dev, ptr);
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} else {
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devres_free(ptr);
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}
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return clk;
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}
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EXPORT_SYMBOL(devm_clk_get);
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static int devm_clk_match(struct device *dev, void *res, void *data)
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{
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struct clk **c = res;
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if (!c || !*c) {
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WARN_ON(!c || !*c);
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return 0;
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}
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return *c == data;
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}
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void devm_clk_put(struct device *dev, struct clk *clk)
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{
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int ret;
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ret = devres_destroy(dev, devm_clk_release, devm_clk_match, clk);
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WARN_ON(ret);
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}
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EXPORT_SYMBOL(devm_clk_put);
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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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EXPORT_SYMBOL(clkdev_add);
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void __init 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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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 * __init_refok
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vclkdev_alloc(struct clk *clk, 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 = clk;
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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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struct clk_lookup * __init_refok
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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, 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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int clk_add_alias(const char *alias, const char *alias_dev_name, char *id,
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struct device *dev)
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{
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struct clk *r = clk_get(dev, 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_alloc(r, alias, alias_dev_name);
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clk_put(r);
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if (!l)
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return -ENODEV;
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clkdev_add(l);
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return 0;
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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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/**
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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: 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 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_fmt, ...)
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{
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struct clk_lookup *cl;
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va_list ap;
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if (IS_ERR(clk))
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return PTR_ERR(clk);
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va_start(ap, dev_fmt);
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cl = vclkdev_alloc(clk, con_id, dev_fmt, ap);
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va_end(ap);
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if (!cl)
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return -ENOMEM;
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clkdev_add(cl);
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return 0;
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}
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/**
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* clk_register_clkdevs - register a set of clk_lookup for a struct clk
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* @clk: struct clk to associate with all clk_lookups
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* @cl: array of clk_lookup structures with con_id and dev_id pre-initialized
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* @num: number of clk_lookup structures to register
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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_clkdevs(struct clk *clk, struct clk_lookup *cl, size_t num)
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{
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unsigned i;
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if (IS_ERR(clk))
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return PTR_ERR(clk);
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for (i = 0; i < num; i++, cl++) {
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cl->clk = clk;
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clkdev_add(cl);
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}
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return 0;
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}
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EXPORT_SYMBOL(clk_register_clkdevs);
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