forked from Minki/linux
6d803ba736
factorise some generic infrastructure to assist looking up struct clks for the ARM & SH architecture. as the code is identical at 99% put the arch specific code for allocation as example in asm/clkdev.h Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Acked-by: Paul Mundt <lethal@linux-sh.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
710 lines
14 KiB
C
710 lines
14 KiB
C
/*
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*
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* Copyright (C) 2010 Google, Inc.
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*
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* Author:
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* Colin Cross <ccross@google.com>
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*
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* This software is licensed under the terms of the GNU General Public
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* License version 2, as published by the Free Software Foundation, and
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* may be copied, distributed, and modified under those terms.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/clk.h>
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#include <linux/list.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/debugfs.h>
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#include <linux/slab.h>
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#include <linux/seq_file.h>
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#include <linux/regulator/consumer.h>
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#include <linux/clkdev.h>
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#include "clock.h"
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#include "board.h"
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#include "fuse.h"
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static LIST_HEAD(clocks);
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static DEFINE_SPINLOCK(clock_lock);
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static DEFINE_MUTEX(dvfs_lock);
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static int clk_is_dvfs(struct clk *c)
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{
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return (c->dvfs != NULL);
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};
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static int dvfs_set_rate(struct dvfs *d, unsigned long rate)
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{
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struct dvfs_table *t;
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if (d->table == NULL)
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return -ENODEV;
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for (t = d->table; t->rate != 0; t++) {
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if (rate <= t->rate) {
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if (!d->reg)
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return 0;
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return regulator_set_voltage(d->reg,
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t->millivolts * 1000,
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d->max_millivolts * 1000);
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}
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}
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return -EINVAL;
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}
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static void dvfs_init(struct clk *c)
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{
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int process_id;
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int i;
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struct dvfs_table *table;
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process_id = c->dvfs->cpu ? tegra_core_process_id() :
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tegra_cpu_process_id();
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for (i = 0; i < c->dvfs->process_id_table_length; i++)
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if (process_id == c->dvfs->process_id_table[i].process_id)
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c->dvfs->table = c->dvfs->process_id_table[i].table;
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if (c->dvfs->table == NULL) {
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pr_err("Failed to find dvfs table for clock %s process %d\n",
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c->name, process_id);
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return;
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}
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c->dvfs->max_millivolts = 0;
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for (table = c->dvfs->table; table->rate != 0; table++)
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if (c->dvfs->max_millivolts < table->millivolts)
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c->dvfs->max_millivolts = table->millivolts;
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c->dvfs->reg = regulator_get(NULL, c->dvfs->reg_id);
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if (IS_ERR(c->dvfs->reg)) {
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pr_err("Failed to get regulator %s for clock %s\n",
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c->dvfs->reg_id, c->name);
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c->dvfs->reg = NULL;
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return;
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}
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if (c->refcnt > 0)
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dvfs_set_rate(c->dvfs, c->rate);
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}
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struct clk *tegra_get_clock_by_name(const char *name)
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{
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struct clk *c;
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struct clk *ret = NULL;
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unsigned long flags;
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spin_lock_irqsave(&clock_lock, flags);
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list_for_each_entry(c, &clocks, node) {
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if (strcmp(c->name, name) == 0) {
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ret = c;
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break;
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}
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}
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spin_unlock_irqrestore(&clock_lock, flags);
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return ret;
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}
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static void clk_recalculate_rate(struct clk *c)
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{
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u64 rate;
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if (!c->parent)
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return;
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rate = c->parent->rate;
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if (c->mul != 0 && c->div != 0) {
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rate = rate * c->mul;
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do_div(rate, c->div);
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}
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if (rate > c->max_rate)
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pr_warn("clocks: Set clock %s to rate %llu, max is %lu\n",
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c->name, rate, c->max_rate);
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c->rate = rate;
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}
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int clk_reparent(struct clk *c, struct clk *parent)
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{
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pr_debug("%s: %s\n", __func__, c->name);
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c->parent = parent;
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list_del(&c->sibling);
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list_add_tail(&c->sibling, &parent->children);
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return 0;
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}
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static void propagate_rate(struct clk *c)
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{
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struct clk *clkp;
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pr_debug("%s: %s\n", __func__, c->name);
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list_for_each_entry(clkp, &c->children, sibling) {
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pr_debug(" %s\n", clkp->name);
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clk_recalculate_rate(clkp);
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propagate_rate(clkp);
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}
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}
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void clk_init(struct clk *c)
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{
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unsigned long flags;
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pr_debug("%s: %s\n", __func__, c->name);
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spin_lock_irqsave(&clock_lock, flags);
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INIT_LIST_HEAD(&c->children);
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INIT_LIST_HEAD(&c->sibling);
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if (c->ops && c->ops->init)
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c->ops->init(c);
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clk_recalculate_rate(c);
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list_add(&c->node, &clocks);
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if (c->parent)
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list_add_tail(&c->sibling, &c->parent->children);
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spin_unlock_irqrestore(&clock_lock, flags);
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}
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int clk_enable_locked(struct clk *c)
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{
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int ret;
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pr_debug("%s: %s\n", __func__, c->name);
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if (c->refcnt == 0) {
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if (c->parent) {
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ret = clk_enable_locked(c->parent);
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if (ret)
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return ret;
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}
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if (c->ops && c->ops->enable) {
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ret = c->ops->enable(c);
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if (ret) {
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if (c->parent)
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clk_disable_locked(c->parent);
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return ret;
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}
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c->state = ON;
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#ifdef CONFIG_DEBUG_FS
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c->set = 1;
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#endif
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}
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}
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c->refcnt++;
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return 0;
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}
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int clk_enable_cansleep(struct clk *c)
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{
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int ret;
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unsigned long flags;
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mutex_lock(&dvfs_lock);
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if (clk_is_dvfs(c) && c->refcnt > 0)
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dvfs_set_rate(c->dvfs, c->rate);
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spin_lock_irqsave(&clock_lock, flags);
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ret = clk_enable_locked(c);
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spin_unlock_irqrestore(&clock_lock, flags);
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mutex_unlock(&dvfs_lock);
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return ret;
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}
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EXPORT_SYMBOL(clk_enable_cansleep);
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int clk_enable(struct clk *c)
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{
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int ret;
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unsigned long flags;
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if (clk_is_dvfs(c))
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BUG();
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spin_lock_irqsave(&clock_lock, flags);
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ret = clk_enable_locked(c);
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spin_unlock_irqrestore(&clock_lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(clk_enable);
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void clk_disable_locked(struct clk *c)
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{
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pr_debug("%s: %s\n", __func__, c->name);
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if (c->refcnt == 0) {
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WARN(1, "Attempting to disable clock %s with refcnt 0", c->name);
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return;
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}
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if (c->refcnt == 1) {
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if (c->ops && c->ops->disable)
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c->ops->disable(c);
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if (c->parent)
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clk_disable_locked(c->parent);
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c->state = OFF;
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}
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c->refcnt--;
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}
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void clk_disable_cansleep(struct clk *c)
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{
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unsigned long flags;
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mutex_lock(&dvfs_lock);
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spin_lock_irqsave(&clock_lock, flags);
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clk_disable_locked(c);
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spin_unlock_irqrestore(&clock_lock, flags);
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if (clk_is_dvfs(c) && c->refcnt == 0)
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dvfs_set_rate(c->dvfs, c->rate);
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mutex_unlock(&dvfs_lock);
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}
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EXPORT_SYMBOL(clk_disable_cansleep);
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void clk_disable(struct clk *c)
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{
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unsigned long flags;
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if (clk_is_dvfs(c))
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BUG();
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spin_lock_irqsave(&clock_lock, flags);
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clk_disable_locked(c);
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spin_unlock_irqrestore(&clock_lock, flags);
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}
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EXPORT_SYMBOL(clk_disable);
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int clk_set_parent_locked(struct clk *c, struct clk *parent)
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{
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int ret;
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pr_debug("%s: %s\n", __func__, c->name);
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if (!c->ops || !c->ops->set_parent)
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return -ENOSYS;
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ret = c->ops->set_parent(c, parent);
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if (ret)
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return ret;
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clk_recalculate_rate(c);
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propagate_rate(c);
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return 0;
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}
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int clk_set_parent(struct clk *c, struct clk *parent)
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{
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int ret;
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unsigned long flags;
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spin_lock_irqsave(&clock_lock, flags);
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ret = clk_set_parent_locked(c, parent);
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spin_unlock_irqrestore(&clock_lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(clk_set_parent);
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struct clk *clk_get_parent(struct clk *c)
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{
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return c->parent;
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}
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EXPORT_SYMBOL(clk_get_parent);
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int clk_set_rate_locked(struct clk *c, unsigned long rate)
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{
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int ret;
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if (rate > c->max_rate)
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rate = c->max_rate;
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if (!c->ops || !c->ops->set_rate)
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return -ENOSYS;
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ret = c->ops->set_rate(c, rate);
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if (ret)
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return ret;
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clk_recalculate_rate(c);
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propagate_rate(c);
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return 0;
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}
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int clk_set_rate_cansleep(struct clk *c, unsigned long rate)
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{
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int ret = 0;
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unsigned long flags;
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pr_debug("%s: %s\n", __func__, c->name);
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mutex_lock(&dvfs_lock);
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if (rate > c->rate)
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ret = dvfs_set_rate(c->dvfs, rate);
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if (ret)
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goto out;
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spin_lock_irqsave(&clock_lock, flags);
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ret = clk_set_rate_locked(c, rate);
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spin_unlock_irqrestore(&clock_lock, flags);
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if (ret)
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goto out;
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ret = dvfs_set_rate(c->dvfs, rate);
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out:
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mutex_unlock(&dvfs_lock);
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return ret;
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}
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EXPORT_SYMBOL(clk_set_rate_cansleep);
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int clk_set_rate(struct clk *c, unsigned long rate)
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{
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int ret = 0;
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unsigned long flags;
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pr_debug("%s: %s\n", __func__, c->name);
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if (clk_is_dvfs(c))
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BUG();
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spin_lock_irqsave(&clock_lock, flags);
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ret = clk_set_rate_locked(c, rate);
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spin_unlock_irqrestore(&clock_lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(clk_set_rate);
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unsigned long clk_get_rate(struct clk *c)
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{
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unsigned long flags;
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unsigned long ret;
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spin_lock_irqsave(&clock_lock, flags);
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pr_debug("%s: %s\n", __func__, c->name);
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ret = c->rate;
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spin_unlock_irqrestore(&clock_lock, flags);
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return ret;
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}
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EXPORT_SYMBOL(clk_get_rate);
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long clk_round_rate(struct clk *c, unsigned long rate)
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{
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pr_debug("%s: %s\n", __func__, c->name);
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if (!c->ops || !c->ops->round_rate)
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return -ENOSYS;
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if (rate > c->max_rate)
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rate = c->max_rate;
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return c->ops->round_rate(c, rate);
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}
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EXPORT_SYMBOL(clk_round_rate);
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static int tegra_clk_init_one_from_table(struct tegra_clk_init_table *table)
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{
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struct clk *c;
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struct clk *p;
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int ret = 0;
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c = tegra_get_clock_by_name(table->name);
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if (!c) {
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pr_warning("Unable to initialize clock %s\n",
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table->name);
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return -ENODEV;
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}
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if (table->parent) {
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p = tegra_get_clock_by_name(table->parent);
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if (!p) {
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pr_warning("Unable to find parent %s of clock %s\n",
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table->parent, table->name);
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return -ENODEV;
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}
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if (c->parent != p) {
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ret = clk_set_parent(c, p);
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if (ret) {
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pr_warning("Unable to set parent %s of clock %s: %d\n",
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table->parent, table->name, ret);
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return -EINVAL;
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}
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}
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}
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if (table->rate && table->rate != clk_get_rate(c)) {
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ret = clk_set_rate(c, table->rate);
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if (ret) {
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pr_warning("Unable to set clock %s to rate %lu: %d\n",
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table->name, table->rate, ret);
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return -EINVAL;
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}
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}
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if (table->enabled) {
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ret = clk_enable(c);
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if (ret) {
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pr_warning("Unable to enable clock %s: %d\n",
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table->name, ret);
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return -EINVAL;
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}
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}
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return 0;
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}
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void tegra_clk_init_from_table(struct tegra_clk_init_table *table)
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{
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for (; table->name; table++)
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tegra_clk_init_one_from_table(table);
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}
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EXPORT_SYMBOL(tegra_clk_init_from_table);
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void tegra_periph_reset_deassert(struct clk *c)
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{
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tegra2_periph_reset_deassert(c);
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}
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EXPORT_SYMBOL(tegra_periph_reset_deassert);
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void tegra_periph_reset_assert(struct clk *c)
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{
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tegra2_periph_reset_assert(c);
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}
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EXPORT_SYMBOL(tegra_periph_reset_assert);
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void __init tegra_init_clock(void)
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{
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tegra2_init_clocks();
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}
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int __init tegra_init_dvfs(void)
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{
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struct clk *c, *safe;
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mutex_lock(&dvfs_lock);
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list_for_each_entry_safe(c, safe, &clocks, node)
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if (c->dvfs)
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dvfs_init(c);
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mutex_unlock(&dvfs_lock);
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return 0;
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}
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late_initcall(tegra_init_dvfs);
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#ifdef CONFIG_DEBUG_FS
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static struct dentry *clk_debugfs_root;
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static void clock_tree_show_one(struct seq_file *s, struct clk *c, int level)
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{
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struct clk *child;
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struct clk *safe;
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const char *state = "uninit";
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char div[8] = {0};
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if (c->state == ON)
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state = "on";
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else if (c->state == OFF)
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state = "off";
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if (c->mul != 0 && c->div != 0) {
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if (c->mul > c->div) {
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int mul = c->mul / c->div;
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int mul2 = (c->mul * 10 / c->div) % 10;
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int mul3 = (c->mul * 10) % c->div;
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if (mul2 == 0 && mul3 == 0)
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snprintf(div, sizeof(div), "x%d", mul);
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else if (mul3 == 0)
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snprintf(div, sizeof(div), "x%d.%d", mul, mul2);
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else
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snprintf(div, sizeof(div), "x%d.%d..", mul, mul2);
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} else {
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snprintf(div, sizeof(div), "%d%s", c->div / c->mul,
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(c->div % c->mul) ? ".5" : "");
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}
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}
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seq_printf(s, "%*s%c%c%-*s %-6s %-3d %-8s %-10lu\n",
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level * 3 + 1, "",
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c->rate > c->max_rate ? '!' : ' ',
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!c->set ? '*' : ' ',
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30 - level * 3, c->name,
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state, c->refcnt, div, c->rate);
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|
list_for_each_entry_safe(child, safe, &c->children, sibling) {
|
|
clock_tree_show_one(s, child, level + 1);
|
|
}
|
|
}
|
|
|
|
static int clock_tree_show(struct seq_file *s, void *data)
|
|
{
|
|
struct clk *c;
|
|
unsigned long flags;
|
|
seq_printf(s, " clock state ref div rate\n");
|
|
seq_printf(s, "--------------------------------------------------------------\n");
|
|
spin_lock_irqsave(&clock_lock, flags);
|
|
list_for_each_entry(c, &clocks, node)
|
|
if (c->parent == NULL)
|
|
clock_tree_show_one(s, c, 0);
|
|
spin_unlock_irqrestore(&clock_lock, flags);
|
|
return 0;
|
|
}
|
|
|
|
static int clock_tree_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, clock_tree_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations clock_tree_fops = {
|
|
.open = clock_tree_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int possible_parents_show(struct seq_file *s, void *data)
|
|
{
|
|
struct clk *c = s->private;
|
|
int i;
|
|
|
|
for (i = 0; c->inputs[i].input; i++) {
|
|
char *first = (i == 0) ? "" : " ";
|
|
seq_printf(s, "%s%s", first, c->inputs[i].input->name);
|
|
}
|
|
seq_printf(s, "\n");
|
|
return 0;
|
|
}
|
|
|
|
static int possible_parents_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, possible_parents_show, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations possible_parents_fops = {
|
|
.open = possible_parents_open,
|
|
.read = seq_read,
|
|
.llseek = seq_lseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
static int clk_debugfs_register_one(struct clk *c)
|
|
{
|
|
struct dentry *d, *child, *child_tmp;
|
|
|
|
d = debugfs_create_dir(c->name, clk_debugfs_root);
|
|
if (!d)
|
|
return -ENOMEM;
|
|
c->dent = d;
|
|
|
|
d = debugfs_create_u8("refcnt", S_IRUGO, c->dent, (u8 *)&c->refcnt);
|
|
if (!d)
|
|
goto err_out;
|
|
|
|
d = debugfs_create_u32("rate", S_IRUGO, c->dent, (u32 *)&c->rate);
|
|
if (!d)
|
|
goto err_out;
|
|
|
|
d = debugfs_create_x32("flags", S_IRUGO, c->dent, (u32 *)&c->flags);
|
|
if (!d)
|
|
goto err_out;
|
|
|
|
if (c->inputs) {
|
|
d = debugfs_create_file("possible_parents", S_IRUGO, c->dent,
|
|
c, &possible_parents_fops);
|
|
if (!d)
|
|
goto err_out;
|
|
}
|
|
|
|
return 0;
|
|
|
|
err_out:
|
|
d = c->dent;
|
|
list_for_each_entry_safe(child, child_tmp, &d->d_subdirs, d_u.d_child)
|
|
debugfs_remove(child);
|
|
debugfs_remove(c->dent);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
static int clk_debugfs_register(struct clk *c)
|
|
{
|
|
int err;
|
|
struct clk *pa = c->parent;
|
|
|
|
if (pa && !pa->dent) {
|
|
err = clk_debugfs_register(pa);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
if (!c->dent) {
|
|
err = clk_debugfs_register_one(c);
|
|
if (err)
|
|
return err;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int __init clk_debugfs_init(void)
|
|
{
|
|
struct clk *c;
|
|
struct dentry *d;
|
|
int err = -ENOMEM;
|
|
|
|
d = debugfs_create_dir("clock", NULL);
|
|
if (!d)
|
|
return -ENOMEM;
|
|
clk_debugfs_root = d;
|
|
|
|
d = debugfs_create_file("clock_tree", S_IRUGO, clk_debugfs_root, NULL,
|
|
&clock_tree_fops);
|
|
if (!d)
|
|
goto err_out;
|
|
|
|
list_for_each_entry(c, &clocks, node) {
|
|
err = clk_debugfs_register(c);
|
|
if (err)
|
|
goto err_out;
|
|
}
|
|
return 0;
|
|
err_out:
|
|
debugfs_remove_recursive(clk_debugfs_root);
|
|
return err;
|
|
}
|
|
|
|
late_initcall(clk_debugfs_init);
|
|
#endif
|