+++ /dev/null
-/*
- * linux/arch/arm/common/timer-sp.c
- *
- * Copyright (C) 1999 - 2003 ARM Limited
- * Copyright (C) 2000 Deep Blue Solutions Ltd
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * 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.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- */
-#include <linux/clk.h>
-#include <linux/clocksource.h>
-#include <linux/clockchips.h>
-#include <linux/err.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/io.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-#include <linux/sched_clock.h>
-
-#include <asm/hardware/arm_timer.h>
-#include <asm/hardware/timer-sp.h>
-
-static long __init sp804_get_clock_rate(struct clk *clk)
-{
- long rate;
- int err;
-
- err = clk_prepare(clk);
- if (err) {
- pr_err("sp804: clock failed to prepare: %d\n", err);
- clk_put(clk);
- return err;
- }
-
- err = clk_enable(clk);
- if (err) {
- pr_err("sp804: clock failed to enable: %d\n", err);
- clk_unprepare(clk);
- clk_put(clk);
- return err;
- }
-
- rate = clk_get_rate(clk);
- if (rate < 0) {
- pr_err("sp804: clock failed to get rate: %ld\n", rate);
- clk_disable(clk);
- clk_unprepare(clk);
- clk_put(clk);
- }
-
- return rate;
-}
-
-static void __iomem *sched_clock_base;
-
-static u64 notrace sp804_read(void)
-{
- return ~readl_relaxed(sched_clock_base + TIMER_VALUE);
-}
-
-void __init __sp804_clocksource_and_sched_clock_init(void __iomem *base,
- const char *name,
- struct clk *clk,
- int use_sched_clock)
-{
- long rate;
-
- if (!clk) {
- clk = clk_get_sys("sp804", name);
- if (IS_ERR(clk)) {
- pr_err("sp804: clock not found: %d\n",
- (int)PTR_ERR(clk));
- return;
- }
- }
-
- rate = sp804_get_clock_rate(clk);
-
- if (rate < 0)
- return;
-
- /* setup timer 0 as free-running clocksource */
- writel(0, base + TIMER_CTRL);
- writel(0xffffffff, base + TIMER_LOAD);
- writel(0xffffffff, base + TIMER_VALUE);
- writel(TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE | TIMER_CTRL_PERIODIC,
- base + TIMER_CTRL);
-
- clocksource_mmio_init(base + TIMER_VALUE, name,
- rate, 200, 32, clocksource_mmio_readl_down);
-
- if (use_sched_clock) {
- sched_clock_base = base;
- sched_clock_register(sp804_read, 32, rate);
- }
-}
-
-
-static void __iomem *clkevt_base;
-static unsigned long clkevt_reload;
-
-/*
- * IRQ handler for the timer
- */
-static irqreturn_t sp804_timer_interrupt(int irq, void *dev_id)
-{
- struct clock_event_device *evt = dev_id;
-
- /* clear the interrupt */
- writel(1, clkevt_base + TIMER_INTCLR);
-
- evt->event_handler(evt);
-
- return IRQ_HANDLED;
-}
-
-static void sp804_set_mode(enum clock_event_mode mode,
- struct clock_event_device *evt)
-{
- unsigned long ctrl = TIMER_CTRL_32BIT | TIMER_CTRL_IE;
-
- writel(ctrl, clkevt_base + TIMER_CTRL);
-
- switch (mode) {
- case CLOCK_EVT_MODE_PERIODIC:
- writel(clkevt_reload, clkevt_base + TIMER_LOAD);
- ctrl |= TIMER_CTRL_PERIODIC | TIMER_CTRL_ENABLE;
- break;
-
- case CLOCK_EVT_MODE_ONESHOT:
- /* period set, and timer enabled in 'next_event' hook */
- ctrl |= TIMER_CTRL_ONESHOT;
- break;
-
- case CLOCK_EVT_MODE_UNUSED:
- case CLOCK_EVT_MODE_SHUTDOWN:
- default:
- break;
- }
-
- writel(ctrl, clkevt_base + TIMER_CTRL);
-}
-
-static int sp804_set_next_event(unsigned long next,
- struct clock_event_device *evt)
-{
- unsigned long ctrl = readl(clkevt_base + TIMER_CTRL);
-
- writel(next, clkevt_base + TIMER_LOAD);
- writel(ctrl | TIMER_CTRL_ENABLE, clkevt_base + TIMER_CTRL);
-
- return 0;
-}
-
-static struct clock_event_device sp804_clockevent = {
- .features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT |
- CLOCK_EVT_FEAT_DYNIRQ,
- .set_mode = sp804_set_mode,
- .set_next_event = sp804_set_next_event,
- .rating = 300,
-};
-
-static struct irqaction sp804_timer_irq = {
- .name = "timer",
- .flags = IRQF_TIMER | IRQF_IRQPOLL,
- .handler = sp804_timer_interrupt,
- .dev_id = &sp804_clockevent,
-};
-
-void __init __sp804_clockevents_init(void __iomem *base, unsigned int irq, struct clk *clk, const char *name)
-{
- struct clock_event_device *evt = &sp804_clockevent;
- long rate;
-
- if (!clk)
- clk = clk_get_sys("sp804", name);
- if (IS_ERR(clk)) {
- pr_err("sp804: %s clock not found: %d\n", name,
- (int)PTR_ERR(clk));
- return;
- }
-
- rate = sp804_get_clock_rate(clk);
- if (rate < 0)
- return;
-
- clkevt_base = base;
- clkevt_reload = DIV_ROUND_CLOSEST(rate, HZ);
- evt->name = name;
- evt->irq = irq;
- evt->cpumask = cpu_possible_mask;
-
- writel(0, base + TIMER_CTRL);
-
- setup_irq(irq, &sp804_timer_irq);
- clockevents_config_and_register(evt, rate, 0xf, 0xffffffff);
-}
-
-static void __init sp804_of_init(struct device_node *np)
-{
- static bool initialized = false;
- void __iomem *base;
- int irq;
- u32 irq_num = 0;
- struct clk *clk1, *clk2;
- const char *name = of_get_property(np, "compatible", NULL);
-
- base = of_iomap(np, 0);
- if (WARN_ON(!base))
- return;
-
- /* Ensure timers are disabled */
- writel(0, base + TIMER_CTRL);
- writel(0, base + TIMER_2_BASE + TIMER_CTRL);
-
- if (initialized || !of_device_is_available(np))
- goto err;
-
- clk1 = of_clk_get(np, 0);
- if (IS_ERR(clk1))
- clk1 = NULL;
-
- /* Get the 2nd clock if the timer has 3 timer clocks */
- if (of_count_phandle_with_args(np, "clocks", "#clock-cells") == 3) {
- clk2 = of_clk_get(np, 1);
- if (IS_ERR(clk2)) {
- pr_err("sp804: %s clock not found: %d\n", np->name,
- (int)PTR_ERR(clk2));
- clk2 = NULL;
- }
- } else
- clk2 = clk1;
-
- irq = irq_of_parse_and_map(np, 0);
- if (irq <= 0)
- goto err;
-
- of_property_read_u32(np, "arm,sp804-has-irq", &irq_num);
- if (irq_num == 2) {
- __sp804_clockevents_init(base + TIMER_2_BASE, irq, clk2, name);
- __sp804_clocksource_and_sched_clock_init(base, name, clk1, 1);
- } else {
- __sp804_clockevents_init(base, irq, clk1 , name);
- __sp804_clocksource_and_sched_clock_init(base + TIMER_2_BASE,
- name, clk2, 1);
- }
- initialized = true;
-
- return;
-err:
- iounmap(base);
-}
-CLOCKSOURCE_OF_DECLARE(sp804, "arm,sp804", sp804_of_init);
-
-static void __init integrator_cp_of_init(struct device_node *np)
-{
- static int init_count = 0;
- void __iomem *base;
- int irq;
- const char *name = of_get_property(np, "compatible", NULL);
- struct clk *clk;
-
- base = of_iomap(np, 0);
- if (WARN_ON(!base))
- return;
- clk = of_clk_get(np, 0);
- if (WARN_ON(IS_ERR(clk)))
- return;
-
- /* Ensure timer is disabled */
- writel(0, base + TIMER_CTRL);
-
- if (init_count == 2 || !of_device_is_available(np))
- goto err;
-
- if (!init_count)
- __sp804_clocksource_and_sched_clock_init(base, name, clk, 0);
- else {
- irq = irq_of_parse_and_map(np, 0);
- if (irq <= 0)
- goto err;
-
- __sp804_clockevents_init(base, irq, clk, name);
- }
-
- init_count++;
- return;
-err:
- iounmap(base);
-}
-CLOCKSOURCE_OF_DECLARE(intcp, "arm,integrator-cp-timer", integrator_cp_of_init);
Code Review / kvmfornfv.git / blobdiff