mirror of https://gitee.com/openkylin/linux.git
148 lines
3.4 KiB
C
148 lines
3.4 KiB
C
/*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* Copyright (C) 2012 ARM Limited
|
|
*/
|
|
|
|
#define pr_fmt(fmt) "vexpress-osc: " fmt
|
|
|
|
#include <linux/clkdev.h>
|
|
#include <linux/clk-provider.h>
|
|
#include <linux/err.h>
|
|
#include <linux/of.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/vexpress.h>
|
|
|
|
struct vexpress_osc {
|
|
struct vexpress_config_func *func;
|
|
struct clk_hw hw;
|
|
unsigned long rate_min;
|
|
unsigned long rate_max;
|
|
};
|
|
|
|
#define to_vexpress_osc(osc) container_of(osc, struct vexpress_osc, hw)
|
|
|
|
static unsigned long vexpress_osc_recalc_rate(struct clk_hw *hw,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct vexpress_osc *osc = to_vexpress_osc(hw);
|
|
u32 rate;
|
|
|
|
vexpress_config_read(osc->func, 0, &rate);
|
|
|
|
return rate;
|
|
}
|
|
|
|
static long vexpress_osc_round_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long *parent_rate)
|
|
{
|
|
struct vexpress_osc *osc = to_vexpress_osc(hw);
|
|
|
|
if (WARN_ON(osc->rate_min && rate < osc->rate_min))
|
|
rate = osc->rate_min;
|
|
|
|
if (WARN_ON(osc->rate_max && rate > osc->rate_max))
|
|
rate = osc->rate_max;
|
|
|
|
return rate;
|
|
}
|
|
|
|
static int vexpress_osc_set_rate(struct clk_hw *hw, unsigned long rate,
|
|
unsigned long parent_rate)
|
|
{
|
|
struct vexpress_osc *osc = to_vexpress_osc(hw);
|
|
|
|
return vexpress_config_write(osc->func, 0, rate);
|
|
}
|
|
|
|
static struct clk_ops vexpress_osc_ops = {
|
|
.recalc_rate = vexpress_osc_recalc_rate,
|
|
.round_rate = vexpress_osc_round_rate,
|
|
.set_rate = vexpress_osc_set_rate,
|
|
};
|
|
|
|
|
|
struct clk * __init vexpress_osc_setup(struct device *dev)
|
|
{
|
|
struct clk_init_data init;
|
|
struct vexpress_osc *osc = kzalloc(sizeof(*osc), GFP_KERNEL);
|
|
|
|
if (!osc)
|
|
return NULL;
|
|
|
|
osc->func = vexpress_config_func_get_by_dev(dev);
|
|
if (!osc->func) {
|
|
kfree(osc);
|
|
return NULL;
|
|
}
|
|
|
|
init.name = dev_name(dev);
|
|
init.ops = &vexpress_osc_ops;
|
|
init.flags = CLK_IS_ROOT;
|
|
init.num_parents = 0;
|
|
osc->hw.init = &init;
|
|
|
|
return clk_register(NULL, &osc->hw);
|
|
}
|
|
|
|
void __init vexpress_osc_of_setup(struct device_node *node)
|
|
{
|
|
struct clk_init_data init;
|
|
struct vexpress_osc *osc;
|
|
struct clk *clk;
|
|
u32 range[2];
|
|
|
|
osc = kzalloc(sizeof(*osc), GFP_KERNEL);
|
|
if (!osc)
|
|
goto error;
|
|
|
|
osc->func = vexpress_config_func_get_by_node(node);
|
|
if (!osc->func) {
|
|
pr_err("Failed to obtain config func for node '%s'!\n",
|
|
node->name);
|
|
goto error;
|
|
}
|
|
|
|
if (of_property_read_u32_array(node, "freq-range", range,
|
|
ARRAY_SIZE(range)) == 0) {
|
|
osc->rate_min = range[0];
|
|
osc->rate_max = range[1];
|
|
}
|
|
|
|
of_property_read_string(node, "clock-output-names", &init.name);
|
|
if (!init.name)
|
|
init.name = node->name;
|
|
|
|
init.ops = &vexpress_osc_ops;
|
|
init.flags = CLK_IS_ROOT;
|
|
init.num_parents = 0;
|
|
|
|
osc->hw.init = &init;
|
|
|
|
clk = clk_register(NULL, &osc->hw);
|
|
if (IS_ERR(clk)) {
|
|
pr_err("Failed to register clock '%s'!\n", init.name);
|
|
goto error;
|
|
}
|
|
|
|
of_clk_add_provider(node, of_clk_src_simple_get, clk);
|
|
|
|
pr_debug("Registered clock '%s'\n", init.name);
|
|
|
|
return;
|
|
|
|
error:
|
|
if (osc->func)
|
|
vexpress_config_func_put(osc->func);
|
|
kfree(osc);
|
|
}
|
|
CLK_OF_DECLARE(vexpress_soc, "arm,vexpress-osc", vexpress_osc_of_setup);
|