diff options
Diffstat (limited to 'drivers/clocksource/time-orion.c')
| -rw-r--r-- | drivers/clocksource/time-orion.c | 150 |
1 files changed, 0 insertions, 150 deletions
diff --git a/drivers/clocksource/time-orion.c b/drivers/clocksource/time-orion.c deleted file mode 100644 index ecbeb6810215..000000000000 --- a/drivers/clocksource/time-orion.c +++ /dev/null @@ -1,150 +0,0 @@ -/* - * Marvell Orion SoC timer handling. - * - * Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> - * - * This file is licensed under the terms of the GNU General Public - * License version 2. This program is licensed "as is" without any - * warranty of any kind, whether express or implied. - * - * Timer 0 is used as free-running clocksource, while timer 1 is - * used as clock_event_device. - */ - -#include <linux/kernel.h> -#include <linux/bitops.h> -#include <linux/clk.h> -#include <linux/clockchips.h> -#include <linux/interrupt.h> -#include <linux/of_address.h> -#include <linux/of_irq.h> -#include <linux/spinlock.h> -#include <asm/sched_clock.h> - -#define TIMER_CTRL 0x00 -#define TIMER0_EN BIT(0) -#define TIMER0_RELOAD_EN BIT(1) -#define TIMER1_EN BIT(2) -#define TIMER1_RELOAD_EN BIT(3) -#define TIMER0_RELOAD 0x10 -#define TIMER0_VAL 0x14 -#define TIMER1_RELOAD 0x18 -#define TIMER1_VAL 0x1c - -#define ORION_ONESHOT_MIN 1 -#define ORION_ONESHOT_MAX 0xfffffffe - -static void __iomem *timer_base; -static DEFINE_SPINLOCK(timer_ctrl_lock); - -/* - * Thread-safe access to TIMER_CTRL register - * (shared with watchdog timer) - */ -void orion_timer_ctrl_clrset(u32 clr, u32 set) -{ - spin_lock(&timer_ctrl_lock); - writel((readl(timer_base + TIMER_CTRL) & ~clr) | set, - timer_base + TIMER_CTRL); - spin_unlock(&timer_ctrl_lock); -} -EXPORT_SYMBOL(orion_timer_ctrl_clrset); - -/* - * Free-running clocksource handling. - */ -static u32 notrace orion_read_sched_clock(void) -{ - return ~readl(timer_base + TIMER0_VAL); -} - -/* - * Clockevent handling. - */ -static u32 ticks_per_jiffy; - -static int orion_clkevt_next_event(unsigned long delta, - struct clock_event_device *dev) -{ - /* setup and enable one-shot timer */ - writel(delta, timer_base + TIMER1_VAL); - orion_timer_ctrl_clrset(TIMER1_RELOAD_EN, TIMER1_EN); - - return 0; -} - -static void orion_clkevt_mode(enum clock_event_mode mode, - struct clock_event_device *dev) -{ - if (mode == CLOCK_EVT_MODE_PERIODIC) { - /* setup and enable periodic timer at 1/HZ intervals */ - writel(ticks_per_jiffy - 1, timer_base + TIMER1_RELOAD); - writel(ticks_per_jiffy - 1, timer_base + TIMER1_VAL); - orion_timer_ctrl_clrset(0, TIMER1_RELOAD_EN | TIMER1_EN); - } else { - /* disable timer */ - orion_timer_ctrl_clrset(TIMER1_RELOAD_EN | TIMER1_EN, 0); - } -} - -static struct clock_event_device orion_clkevt = { - .name = "orion_event", - .features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_PERIODIC, - .shift = 32, - .rating = 300, - .set_next_event = orion_clkevt_next_event, - .set_mode = orion_clkevt_mode, -}; - -static irqreturn_t orion_clkevt_irq_handler(int irq, void *dev_id) -{ - orion_clkevt.event_handler(&orion_clkevt); - return IRQ_HANDLED; -} - -static struct irqaction orion_clkevt_irq = { - .name = "orion_event", - .flags = IRQF_TIMER, - .handler = orion_clkevt_irq_handler, -}; - -static void __init orion_timer_init(struct device_node *np) -{ - struct clk *clk; - int irq; - - /* timer registers are shared with watchdog timer */ - timer_base = of_iomap(np, 0); - if (!timer_base) - panic("%s: unable to map resource\n", np->name); - - clk = of_clk_get(np, 0); - if (IS_ERR(clk)) - panic("%s: unable to get clk\n", np->name); - clk_prepare_enable(clk); - - /* we are only interested in timer1 irq */ - irq = irq_of_parse_and_map(np, 1); - if (irq <= 0) - panic("%s: unable to parse timer1 irq\n", np->name); - - /* setup timer0 as free-running clocksource */ - writel(~0, timer_base + TIMER0_VAL); - writel(~0, timer_base + TIMER0_RELOAD); - orion_timer_ctrl_clrset(0, TIMER0_RELOAD_EN | TIMER0_EN); - clocksource_mmio_init(timer_base + TIMER0_VAL, "orion_clocksource", - clk_get_rate(clk), 300, 32, - clocksource_mmio_readl_down); - setup_sched_clock(orion_read_sched_clock, 32, clk_get_rate(clk)); - - /* setup timer1 as clockevent timer */ - if (setup_irq(irq, &orion_clkevt_irq)) - panic("%s: unable to setup irq\n", np->name); - - ticks_per_jiffy = (clk_get_rate(clk) + HZ/2) / HZ; - orion_clkevt.cpumask = cpumask_of(0); - orion_clkevt.irq = irq; - clockevents_config_and_register(&orion_clkevt, clk_get_rate(clk), - ORION_ONESHOT_MIN, ORION_ONESHOT_MAX); -} -CLOCKSOURCE_OF_DECLARE(orion_timer, "marvell,orion-timer", orion_timer_init); |