570a0bb82f
Add support for managing the clocks found on JZ4740 SoC through the Linux clock API. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Cc: linux-mips@linux-mips.org Cc: linux-kernel@vger.kernel.org Patchwork: https://patchwork.linux-mips.org/patch/1466/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
110 lines
2.7 KiB
C
110 lines
2.7 KiB
C
/*
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* Copyright (C) 2010, Lars-Peter Clausen <lars@metafoo.de>
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* JZ4740 SoC clock support debugfs entries
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 2 of the License, or (at your
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* option) any later version.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/clk.h>
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#include <linux/err.h>
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#include <linux/debugfs.h>
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#include <linux/uaccess.h>
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#include <asm/mach-jz4740/clock.h>
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#include "clock.h"
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static struct dentry *jz4740_clock_debugfs;
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static int jz4740_clock_debugfs_show_enabled(void *data, uint64_t *value)
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{
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struct clk *clk = data;
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*value = clk_is_enabled(clk);
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return 0;
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}
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static int jz4740_clock_debugfs_set_enabled(void *data, uint64_t value)
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{
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struct clk *clk = data;
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if (value)
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return clk_enable(clk);
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else
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clk_disable(clk);
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return 0;
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}
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DEFINE_SIMPLE_ATTRIBUTE(jz4740_clock_debugfs_ops_enabled,
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jz4740_clock_debugfs_show_enabled,
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jz4740_clock_debugfs_set_enabled,
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"%llu\n");
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static int jz4740_clock_debugfs_show_rate(void *data, uint64_t *value)
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{
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struct clk *clk = data;
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*value = clk_get_rate(clk);
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return 0;
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}
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DEFINE_SIMPLE_ATTRIBUTE(jz4740_clock_debugfs_ops_rate,
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jz4740_clock_debugfs_show_rate,
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NULL,
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"%llu\n");
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void jz4740_clock_debugfs_add_clk(struct clk *clk)
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{
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if (!jz4740_clock_debugfs)
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return;
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clk->debugfs_entry = debugfs_create_dir(clk->name, jz4740_clock_debugfs);
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debugfs_create_file("rate", S_IWUGO | S_IRUGO, clk->debugfs_entry, clk,
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&jz4740_clock_debugfs_ops_rate);
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debugfs_create_file("enabled", S_IRUGO, clk->debugfs_entry, clk,
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&jz4740_clock_debugfs_ops_enabled);
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if (clk->parent) {
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char parent_path[100];
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snprintf(parent_path, 100, "../%s", clk->parent->name);
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clk->debugfs_parent_entry = debugfs_create_symlink("parent",
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clk->debugfs_entry,
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parent_path);
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}
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}
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/* TODO: Locking */
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void jz4740_clock_debugfs_update_parent(struct clk *clk)
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{
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if (clk->debugfs_parent_entry)
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debugfs_remove(clk->debugfs_parent_entry);
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if (clk->parent) {
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char parent_path[100];
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snprintf(parent_path, 100, "../%s", clk->parent->name);
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clk->debugfs_parent_entry = debugfs_create_symlink("parent",
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clk->debugfs_entry,
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parent_path);
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} else {
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clk->debugfs_parent_entry = NULL;
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}
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}
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void jz4740_clock_debugfs_init(void)
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{
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jz4740_clock_debugfs = debugfs_create_dir("jz4740-clock", NULL);
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if (IS_ERR(jz4740_clock_debugfs))
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jz4740_clock_debugfs = NULL;
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}
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