linux/drivers/clk/versatile/clk-sp810.c
Thomas Gleixner 1802d0beec treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 174
Based on 1 normalized pattern(s):

  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

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 655 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070034.575739538@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-30 11:26:41 -07:00

139 lines
3.4 KiB
C

// SPDX-License-Identifier: GPL-2.0-only
/*
*
* Copyright (C) 2013 ARM Limited
*/
#include <linux/amba/sp810.h>
#include <linux/slab.h>
#include <linux/clk.h>
#include <linux/clk-provider.h>
#include <linux/err.h>
#include <linux/io.h>
#include <linux/of.h>
#include <linux/of_address.h>
#define to_clk_sp810_timerclken(_hw) \
container_of(_hw, struct clk_sp810_timerclken, hw)
struct clk_sp810;
struct clk_sp810_timerclken {
struct clk_hw hw;
struct clk *clk;
struct clk_sp810 *sp810;
int channel;
};
struct clk_sp810 {
struct device_node *node;
void __iomem *base;
spinlock_t lock;
struct clk_sp810_timerclken timerclken[4];
};
static u8 clk_sp810_timerclken_get_parent(struct clk_hw *hw)
{
struct clk_sp810_timerclken *timerclken = to_clk_sp810_timerclken(hw);
u32 val = readl(timerclken->sp810->base + SCCTRL);
return !!(val & (1 << SCCTRL_TIMERENnSEL_SHIFT(timerclken->channel)));
}
static int clk_sp810_timerclken_set_parent(struct clk_hw *hw, u8 index)
{
struct clk_sp810_timerclken *timerclken = to_clk_sp810_timerclken(hw);
struct clk_sp810 *sp810 = timerclken->sp810;
u32 val, shift = SCCTRL_TIMERENnSEL_SHIFT(timerclken->channel);
unsigned long flags = 0;
if (WARN_ON(index > 1))
return -EINVAL;
spin_lock_irqsave(&sp810->lock, flags);
val = readl(sp810->base + SCCTRL);
val &= ~(1 << shift);
val |= index << shift;
writel(val, sp810->base + SCCTRL);
spin_unlock_irqrestore(&sp810->lock, flags);
return 0;
}
static const struct clk_ops clk_sp810_timerclken_ops = {
.get_parent = clk_sp810_timerclken_get_parent,
.set_parent = clk_sp810_timerclken_set_parent,
};
static struct clk *clk_sp810_timerclken_of_get(struct of_phandle_args *clkspec,
void *data)
{
struct clk_sp810 *sp810 = data;
if (WARN_ON(clkspec->args_count != 1 ||
clkspec->args[0] >= ARRAY_SIZE(sp810->timerclken)))
return NULL;
return sp810->timerclken[clkspec->args[0]].clk;
}
static void __init clk_sp810_of_setup(struct device_node *node)
{
struct clk_sp810 *sp810 = kzalloc(sizeof(*sp810), GFP_KERNEL);
const char *parent_names[2];
int num = ARRAY_SIZE(parent_names);
char name[12];
struct clk_init_data init;
static int instance;
int i;
bool deprecated;
if (!sp810)
return;
if (of_clk_parent_fill(node, parent_names, num) != num) {
pr_warn("Failed to obtain parent clocks for SP810!\n");
kfree(sp810);
return;
}
sp810->node = node;
sp810->base = of_iomap(node, 0);
spin_lock_init(&sp810->lock);
init.name = name;
init.ops = &clk_sp810_timerclken_ops;
init.flags = 0;
init.parent_names = parent_names;
init.num_parents = num;
deprecated = !of_find_property(node, "assigned-clock-parents", NULL);
for (i = 0; i < ARRAY_SIZE(sp810->timerclken); i++) {
snprintf(name, sizeof(name), "sp810_%d_%d", instance, i);
sp810->timerclken[i].sp810 = sp810;
sp810->timerclken[i].channel = i;
sp810->timerclken[i].hw.init = &init;
/*
* If DT isn't setting the parent, force it to be
* the 1 MHz clock without going through the framework.
* We do this before clk_register() so that it can determine
* the parent and setup the tree properly.
*/
if (deprecated)
init.ops->set_parent(&sp810->timerclken[i].hw, 1);
sp810->timerclken[i].clk = clk_register(NULL,
&sp810->timerclken[i].hw);
WARN_ON(IS_ERR(sp810->timerclken[i].clk));
}
of_clk_add_provider(node, clk_sp810_timerclken_of_get, sp810);
instance++;
}
CLK_OF_DECLARE(sp810, "arm,sp810", clk_sp810_of_setup);