diff options
Diffstat (limited to 'kernel/arch/arm/common/timer-sp.c')
| -rw-r--r-- | kernel/arch/arm/common/timer-sp.c | 304 |
1 files changed, 0 insertions, 304 deletions
diff --git a/kernel/arch/arm/common/timer-sp.c b/kernel/arch/arm/common/timer-sp.c deleted file mode 100644 index 192113247..000000000 --- a/kernel/arch/arm/common/timer-sp.c +++ /dev/null @@ -1,304 +0,0 @@ -/* - * 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); |