mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-08-26 19:00:25 +00:00
![Benjamin Gaignard](/assets/img/avatar_default.png)
Change the function name to something more explicit since it is only used in init error cases. Add __init annotation and description about the function usage. Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: mark.rutland@arm.com Cc: devicetree@vger.kernel.org Cc: alexandre.torgue@st.com Cc: arnd@arndb.de Cc: julien.thierry@arm.com Cc: daniel.lezcano@linaro.org Cc: linux@armlinux.org.uk Cc: robh+dt@kernel.org Cc: linux-arm-kernel@lists.infradead.org Cc: mcoquelin.stm32@gmail.com Cc: sudeep.holla@arm.com Cc: ludovic.barre@st.com Link: https://lkml.kernel.org/r/1510649563-22975-2-git-send-email-benjamin.gaignard@linaro.org
197 lines
4.6 KiB
C
197 lines
4.6 KiB
C
/*
|
|
* Copyright (c) 2017, Linaro Ltd. All rights reserved.
|
|
*
|
|
* Author: Daniel Lezcano <daniel.lezcano@linaro.org>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope 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.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#include <linux/clk.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/of.h>
|
|
#include <linux/of_address.h>
|
|
#include <linux/of_irq.h>
|
|
#include <linux/slab.h>
|
|
|
|
#include "timer-of.h"
|
|
|
|
static __init void timer_irq_exit(struct of_timer_irq *of_irq)
|
|
{
|
|
struct timer_of *to = container_of(of_irq, struct timer_of, of_irq);
|
|
|
|
struct clock_event_device *clkevt = &to->clkevt;
|
|
|
|
of_irq->percpu ? free_percpu_irq(of_irq->irq, clkevt) :
|
|
free_irq(of_irq->irq, clkevt);
|
|
}
|
|
|
|
static __init int timer_irq_init(struct device_node *np,
|
|
struct of_timer_irq *of_irq)
|
|
{
|
|
int ret;
|
|
struct timer_of *to = container_of(of_irq, struct timer_of, of_irq);
|
|
struct clock_event_device *clkevt = &to->clkevt;
|
|
|
|
if (of_irq->name) {
|
|
of_irq->irq = ret = of_irq_get_byname(np, of_irq->name);
|
|
if (ret < 0) {
|
|
pr_err("Failed to get interrupt %s for %s\n",
|
|
of_irq->name, np->full_name);
|
|
return ret;
|
|
}
|
|
} else {
|
|
of_irq->irq = irq_of_parse_and_map(np, of_irq->index);
|
|
}
|
|
if (!of_irq->irq) {
|
|
pr_err("Failed to map interrupt for %pOF\n", np);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = of_irq->percpu ?
|
|
request_percpu_irq(of_irq->irq, of_irq->handler,
|
|
np->full_name, clkevt) :
|
|
request_irq(of_irq->irq, of_irq->handler,
|
|
of_irq->flags ? of_irq->flags : IRQF_TIMER,
|
|
np->full_name, clkevt);
|
|
if (ret) {
|
|
pr_err("Failed to request irq %d for %pOF\n", of_irq->irq, np);
|
|
return ret;
|
|
}
|
|
|
|
clkevt->irq = of_irq->irq;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static __init void timer_clk_exit(struct of_timer_clk *of_clk)
|
|
{
|
|
of_clk->rate = 0;
|
|
clk_disable_unprepare(of_clk->clk);
|
|
clk_put(of_clk->clk);
|
|
}
|
|
|
|
static __init int timer_clk_init(struct device_node *np,
|
|
struct of_timer_clk *of_clk)
|
|
{
|
|
int ret;
|
|
|
|
of_clk->clk = of_clk->name ? of_clk_get_by_name(np, of_clk->name) :
|
|
of_clk_get(np, of_clk->index);
|
|
if (IS_ERR(of_clk->clk)) {
|
|
pr_err("Failed to get clock for %pOF\n", np);
|
|
return PTR_ERR(of_clk->clk);
|
|
}
|
|
|
|
ret = clk_prepare_enable(of_clk->clk);
|
|
if (ret) {
|
|
pr_err("Failed for enable clock for %pOF\n", np);
|
|
goto out_clk_put;
|
|
}
|
|
|
|
of_clk->rate = clk_get_rate(of_clk->clk);
|
|
if (!of_clk->rate) {
|
|
ret = -EINVAL;
|
|
pr_err("Failed to get clock rate for %pOF\n", np);
|
|
goto out_clk_disable;
|
|
}
|
|
|
|
of_clk->period = DIV_ROUND_UP(of_clk->rate, HZ);
|
|
out:
|
|
return ret;
|
|
|
|
out_clk_disable:
|
|
clk_disable_unprepare(of_clk->clk);
|
|
out_clk_put:
|
|
clk_put(of_clk->clk);
|
|
|
|
goto out;
|
|
}
|
|
|
|
static __init void timer_base_exit(struct of_timer_base *of_base)
|
|
{
|
|
iounmap(of_base->base);
|
|
}
|
|
|
|
static __init int timer_base_init(struct device_node *np,
|
|
struct of_timer_base *of_base)
|
|
{
|
|
const char *name = of_base->name ? of_base->name : np->full_name;
|
|
|
|
of_base->base = of_io_request_and_map(np, of_base->index, name);
|
|
if (IS_ERR(of_base->base)) {
|
|
pr_err("Failed to iomap (%s)\n", name);
|
|
return PTR_ERR(of_base->base);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __init timer_of_init(struct device_node *np, struct timer_of *to)
|
|
{
|
|
int ret = -EINVAL;
|
|
int flags = 0;
|
|
|
|
if (to->flags & TIMER_OF_BASE) {
|
|
ret = timer_base_init(np, &to->of_base);
|
|
if (ret)
|
|
goto out_fail;
|
|
flags |= TIMER_OF_BASE;
|
|
}
|
|
|
|
if (to->flags & TIMER_OF_CLOCK) {
|
|
ret = timer_clk_init(np, &to->of_clk);
|
|
if (ret)
|
|
goto out_fail;
|
|
flags |= TIMER_OF_CLOCK;
|
|
}
|
|
|
|
if (to->flags & TIMER_OF_IRQ) {
|
|
ret = timer_irq_init(np, &to->of_irq);
|
|
if (ret)
|
|
goto out_fail;
|
|
flags |= TIMER_OF_IRQ;
|
|
}
|
|
|
|
if (!to->clkevt.name)
|
|
to->clkevt.name = np->name;
|
|
return ret;
|
|
|
|
out_fail:
|
|
if (flags & TIMER_OF_IRQ)
|
|
timer_irq_exit(&to->of_irq);
|
|
|
|
if (flags & TIMER_OF_CLOCK)
|
|
timer_clk_exit(&to->of_clk);
|
|
|
|
if (flags & TIMER_OF_BASE)
|
|
timer_base_exit(&to->of_base);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* timer_of_cleanup - release timer_of ressources
|
|
* @to: timer_of structure
|
|
*
|
|
* Release the ressources that has been used in timer_of_init().
|
|
* This function should be called in init error cases
|
|
*/
|
|
void __init timer_of_cleanup(struct timer_of *to)
|
|
{
|
|
if (to->flags & TIMER_OF_IRQ)
|
|
timer_irq_exit(&to->of_irq);
|
|
|
|
if (to->flags & TIMER_OF_CLOCK)
|
|
timer_clk_exit(&to->of_clk);
|
|
|
|
if (to->flags & TIMER_OF_BASE)
|
|
timer_base_exit(&to->of_base);
|
|
}
|