--- /dev/null
+/*
+ * 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;
+
+ of_irq->irq = of_irq->name ? of_irq_get_byname(np, of_irq->name):
+ irq_of_parse_and_map(np, of_irq->index);
+ if (!of_irq->irq) {
+ pr_err("Failed to map interrupt for %s\n", np->full_name);
+ 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 %s\n", of_irq->irq,
+ np->full_name);
+ 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 %s\n", np->full_name);
+ return PTR_ERR(of_clk->clk);
+ }
+
+ ret = clk_prepare_enable(of_clk->clk);
+ if (ret) {
+ pr_err("Failed for enable clock for %s\n", np->full_name);
+ 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 %s\n", np->full_name);
+ 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 (of_base->base) {
+ pr_err("Failed to iomap (%s)\n", name);
+ return -ENXIO;
+ }
+
+ return 0;
+}
+
+int __init timer_of_init(struct device_node *np, struct timer_of *to)
+{
+ int ret;
+ 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;
+out:
+ 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);
+ goto out;
+}
--- /dev/null
+#ifndef __TIMER_OF_H__
+#define __TIMER_OF_H__
+
+#include <linux/clockchips.h>
+
+#define TIMER_OF_BASE 0x1
+#define TIMER_OF_CLOCK 0x2
+#define TIMER_OF_IRQ 0x4
+
+struct of_timer_irq {
+ int irq;
+ int index;
+ int percpu;
+ const char *name;
+ unsigned long flags;
+ irq_handler_t handler;
+};
+
+struct of_timer_base {
+ void __iomem *base;
+ const char *name;
+ int index;
+};
+
+struct of_timer_clk {
+ struct clk *clk;
+ const char *name;
+ int index;
+ unsigned long rate;
+ unsigned long period;
+};
+
+struct timer_of {
+ unsigned int flags;
+ struct clock_event_device clkevt;
+ struct of_timer_base of_base;
+ struct of_timer_irq of_irq;
+ struct of_timer_clk of_clk;
+ void *private_data;
+};
+
+static inline struct timer_of *to_timer_of(struct clock_event_device *clkevt)
+{
+ return container_of(clkevt, struct timer_of, clkevt);
+}
+
+static inline void __iomem *timer_of_base(struct timer_of *to)
+{
+ return to->of_base.base;
+}
+
+static inline int timer_of_irq(struct timer_of *to)
+{
+ return to->of_irq.irq;
+}
+
+static inline unsigned long timer_of_rate(struct timer_of *to)
+{
+ return to->of_clk.rate;
+}
+
+static inline unsigned long timer_of_period(struct timer_of *to)
+{
+ return to->of_clk.period;
+}
+
+extern int __init timer_of_init(struct device_node *np,
+ struct timer_of *to);
+#endif
projects / GitHub / moto-9609 / android_kernel_motorola_exynos9610.git / commitdiff