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![Daniel Lezcano](/assets/img/avatar_default.png)
When the driver does not specify a name for the resource, don't use of_io_request_and_map() but of_iomap(). That prevents resource name allocation conflicts on some platforms which have the same name as the node. Tested-by: Benjamin Gaignard <benjamin.gaignard@st.com> Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Acked-by: Benjamin Gaignard <benjamin.gaignard@st.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/1515418139-23276-10-git-send-email-daniel.lezcano@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
237 lines
5.7 KiB
C
237 lines
5.7 KiB
C
/*
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* Copyright (c) 2017, Linaro Ltd. All rights reserved.
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*
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* Author: Daniel Lezcano <daniel.lezcano@linaro.org>
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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 and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/clk.h>
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#include <linux/interrupt.h>
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#include <linux/of.h>
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#include <linux/of_address.h>
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#include <linux/of_irq.h>
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#include <linux/slab.h>
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#include "timer-of.h"
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/**
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* timer_of_irq_exit - Release the interrupt
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* @of_irq: an of_timer_irq structure pointer
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*
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* Free the irq resource
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*/
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static __init void timer_of_irq_exit(struct of_timer_irq *of_irq)
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{
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struct timer_of *to = container_of(of_irq, struct timer_of, of_irq);
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struct clock_event_device *clkevt = &to->clkevt;
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of_irq->percpu ? free_percpu_irq(of_irq->irq, clkevt) :
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free_irq(of_irq->irq, clkevt);
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}
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/**
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* timer_of_irq_init - Request the interrupt
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* @np: a device tree node pointer
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* @of_irq: an of_timer_irq structure pointer
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*
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* Get the interrupt number from the DT from its definition and
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* request it. The interrupt is gotten by falling back the following way:
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*
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* - Get interrupt number by name
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* - Get interrupt number by index
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*
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* When the interrupt is per CPU, 'request_percpu_irq()' is called,
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* otherwise 'request_irq()' is used.
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*
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* Returns 0 on success, < 0 otherwise
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*/
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static __init int timer_of_irq_init(struct device_node *np,
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struct of_timer_irq *of_irq)
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{
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int ret;
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struct timer_of *to = container_of(of_irq, struct timer_of, of_irq);
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struct clock_event_device *clkevt = &to->clkevt;
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if (of_irq->name) {
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of_irq->irq = ret = of_irq_get_byname(np, of_irq->name);
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if (ret < 0) {
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pr_err("Failed to get interrupt %s for %s\n",
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of_irq->name, np->full_name);
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return ret;
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}
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} else {
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of_irq->irq = irq_of_parse_and_map(np, of_irq->index);
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}
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if (!of_irq->irq) {
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pr_err("Failed to map interrupt for %pOF\n", np);
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return -EINVAL;
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}
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ret = of_irq->percpu ?
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request_percpu_irq(of_irq->irq, of_irq->handler,
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np->full_name, clkevt) :
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request_irq(of_irq->irq, of_irq->handler,
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of_irq->flags ? of_irq->flags : IRQF_TIMER,
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np->full_name, clkevt);
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if (ret) {
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pr_err("Failed to request irq %d for %pOF\n", of_irq->irq, np);
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return ret;
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}
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clkevt->irq = of_irq->irq;
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return 0;
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}
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/**
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* timer_of_clk_exit - Release the clock resources
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* @of_clk: a of_timer_clk structure pointer
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*
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* Disables and releases the refcount on the clk
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*/
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static __init void timer_of_clk_exit(struct of_timer_clk *of_clk)
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{
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of_clk->rate = 0;
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clk_disable_unprepare(of_clk->clk);
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clk_put(of_clk->clk);
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}
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/**
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* timer_of_clk_init - Initialize the clock resources
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* @np: a device tree node pointer
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* @of_clk: a of_timer_clk structure pointer
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*
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* Get the clock by name or by index, enable it and get the rate
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*
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* Returns 0 on success, < 0 otherwise
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*/
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static __init int timer_of_clk_init(struct device_node *np,
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struct of_timer_clk *of_clk)
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{
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int ret;
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of_clk->clk = of_clk->name ? of_clk_get_by_name(np, of_clk->name) :
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of_clk_get(np, of_clk->index);
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if (IS_ERR(of_clk->clk)) {
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pr_err("Failed to get clock for %pOF\n", np);
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return PTR_ERR(of_clk->clk);
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}
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ret = clk_prepare_enable(of_clk->clk);
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if (ret) {
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pr_err("Failed for enable clock for %pOF\n", np);
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goto out_clk_put;
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}
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of_clk->rate = clk_get_rate(of_clk->clk);
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if (!of_clk->rate) {
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ret = -EINVAL;
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pr_err("Failed to get clock rate for %pOF\n", np);
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goto out_clk_disable;
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}
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of_clk->period = DIV_ROUND_UP(of_clk->rate, HZ);
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out:
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return ret;
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out_clk_disable:
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clk_disable_unprepare(of_clk->clk);
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out_clk_put:
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clk_put(of_clk->clk);
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goto out;
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}
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static __init void timer_of_base_exit(struct of_timer_base *of_base)
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{
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iounmap(of_base->base);
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}
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static __init int timer_of_base_init(struct device_node *np,
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struct of_timer_base *of_base)
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{
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of_base->base = of_base->name ?
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of_io_request_and_map(np, of_base->index, of_base->name) :
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of_iomap(np, of_base->index);
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if (IS_ERR(of_base->base)) {
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pr_err("Failed to iomap (%s)\n", of_base->name);
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return PTR_ERR(of_base->base);
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}
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return 0;
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}
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int __init timer_of_init(struct device_node *np, struct timer_of *to)
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{
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int ret = -EINVAL;
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int flags = 0;
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if (to->flags & TIMER_OF_BASE) {
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ret = timer_of_base_init(np, &to->of_base);
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if (ret)
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goto out_fail;
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flags |= TIMER_OF_BASE;
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}
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if (to->flags & TIMER_OF_CLOCK) {
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ret = timer_of_clk_init(np, &to->of_clk);
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if (ret)
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goto out_fail;
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flags |= TIMER_OF_CLOCK;
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}
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if (to->flags & TIMER_OF_IRQ) {
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ret = timer_of_irq_init(np, &to->of_irq);
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if (ret)
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goto out_fail;
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flags |= TIMER_OF_IRQ;
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}
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if (!to->clkevt.name)
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to->clkevt.name = np->name;
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to->np = np;
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return ret;
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out_fail:
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if (flags & TIMER_OF_IRQ)
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timer_of_irq_exit(&to->of_irq);
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if (flags & TIMER_OF_CLOCK)
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timer_of_clk_exit(&to->of_clk);
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if (flags & TIMER_OF_BASE)
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timer_of_base_exit(&to->of_base);
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return ret;
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}
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/**
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* timer_of_cleanup - release timer_of ressources
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* @to: timer_of structure
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*
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* Release the ressources that has been used in timer_of_init().
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* This function should be called in init error cases
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*/
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void __init timer_of_cleanup(struct timer_of *to)
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{
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if (to->flags & TIMER_OF_IRQ)
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timer_of_irq_exit(&to->of_irq);
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if (to->flags & TIMER_OF_CLOCK)
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timer_of_clk_exit(&to->of_clk);
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if (to->flags & TIMER_OF_BASE)
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timer_of_base_exit(&to->of_base);
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}
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