diff options
Diffstat (limited to 'arch/arm/plat-mxc/epit.c')
| -rw-r--r-- | arch/arm/plat-mxc/epit.c | 234 |
1 files changed, 0 insertions, 234 deletions
diff --git a/arch/arm/plat-mxc/epit.c b/arch/arm/plat-mxc/epit.c deleted file mode 100644 index 88726f4dbbfa..000000000000 --- a/arch/arm/plat-mxc/epit.c +++ /dev/null @@ -1,234 +0,0 @@ -/* - * linux/arch/arm/plat-mxc/epit.c - * - * Copyright (C) 2010 Sascha Hauer <s.hauer@pengutronix.de> - * - * 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., 51 Franklin Street, Fifth Floor, Boston, - * MA 02110-1301, USA. - */ - -#define EPITCR 0x00 -#define EPITSR 0x04 -#define EPITLR 0x08 -#define EPITCMPR 0x0c -#define EPITCNR 0x10 - -#define EPITCR_EN (1 << 0) -#define EPITCR_ENMOD (1 << 1) -#define EPITCR_OCIEN (1 << 2) -#define EPITCR_RLD (1 << 3) -#define EPITCR_PRESC(x) (((x) & 0xfff) << 4) -#define EPITCR_SWR (1 << 16) -#define EPITCR_IOVW (1 << 17) -#define EPITCR_DBGEN (1 << 18) -#define EPITCR_WAITEN (1 << 19) -#define EPITCR_RES (1 << 20) -#define EPITCR_STOPEN (1 << 21) -#define EPITCR_OM_DISCON (0 << 22) -#define EPITCR_OM_TOGGLE (1 << 22) -#define EPITCR_OM_CLEAR (2 << 22) -#define EPITCR_OM_SET (3 << 22) -#define EPITCR_CLKSRC_OFF (0 << 24) -#define EPITCR_CLKSRC_PERIPHERAL (1 << 24) -#define EPITCR_CLKSRC_REF_HIGH (1 << 24) -#define EPITCR_CLKSRC_REF_LOW (3 << 24) - -#define EPITSR_OCIF (1 << 0) - -#include <linux/interrupt.h> -#include <linux/irq.h> -#include <linux/clockchips.h> -#include <linux/clk.h> -#include <linux/err.h> - -#include <mach/hardware.h> -#include <asm/mach/time.h> -#include <mach/common.h> - -static struct clock_event_device clockevent_epit; -static enum clock_event_mode clockevent_mode = CLOCK_EVT_MODE_UNUSED; - -static void __iomem *timer_base; - -static inline void epit_irq_disable(void) -{ - u32 val; - - val = __raw_readl(timer_base + EPITCR); - val &= ~EPITCR_OCIEN; - __raw_writel(val, timer_base + EPITCR); -} - -static inline void epit_irq_enable(void) -{ - u32 val; - - val = __raw_readl(timer_base + EPITCR); - val |= EPITCR_OCIEN; - __raw_writel(val, timer_base + EPITCR); -} - -static void epit_irq_acknowledge(void) -{ - __raw_writel(EPITSR_OCIF, timer_base + EPITSR); -} - -static int __init epit_clocksource_init(struct clk *timer_clk) -{ - unsigned int c = clk_get_rate(timer_clk); - - return clocksource_mmio_init(timer_base + EPITCNR, "epit", c, 200, 32, - clocksource_mmio_readl_down); -} - -/* clock event */ - -static int epit_set_next_event(unsigned long evt, - struct clock_event_device *unused) -{ - unsigned long tcmp; - - tcmp = __raw_readl(timer_base + EPITCNR); - - __raw_writel(tcmp - evt, timer_base + EPITCMPR); - - return 0; -} - -static void epit_set_mode(enum clock_event_mode mode, - struct clock_event_device *evt) -{ - unsigned long flags; - - /* - * The timer interrupt generation is disabled at least - * for enough time to call epit_set_next_event() - */ - local_irq_save(flags); - - /* Disable interrupt in GPT module */ - epit_irq_disable(); - - if (mode != clockevent_mode) { - /* Set event time into far-far future */ - - /* Clear pending interrupt */ - epit_irq_acknowledge(); - } - - /* Remember timer mode */ - clockevent_mode = mode; - local_irq_restore(flags); - - switch (mode) { - case CLOCK_EVT_MODE_PERIODIC: - printk(KERN_ERR "epit_set_mode: Periodic mode is not " - "supported for i.MX EPIT\n"); - break; - case CLOCK_EVT_MODE_ONESHOT: - /* - * Do not put overhead of interrupt enable/disable into - * epit_set_next_event(), the core has about 4 minutes - * to call epit_set_next_event() or shutdown clock after - * mode switching - */ - local_irq_save(flags); - epit_irq_enable(); - local_irq_restore(flags); - break; - case CLOCK_EVT_MODE_SHUTDOWN: - case CLOCK_EVT_MODE_UNUSED: - case CLOCK_EVT_MODE_RESUME: - /* Left event sources disabled, no more interrupts appear */ - break; - } -} - -/* - * IRQ handler for the timer - */ -static irqreturn_t epit_timer_interrupt(int irq, void *dev_id) -{ - struct clock_event_device *evt = &clockevent_epit; - - epit_irq_acknowledge(); - - evt->event_handler(evt); - - return IRQ_HANDLED; -} - -static struct irqaction epit_timer_irq = { - .name = "i.MX EPIT Timer Tick", - .flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL, - .handler = epit_timer_interrupt, -}; - -static struct clock_event_device clockevent_epit = { - .name = "epit", - .features = CLOCK_EVT_FEAT_ONESHOT, - .shift = 32, - .set_mode = epit_set_mode, - .set_next_event = epit_set_next_event, - .rating = 200, -}; - -static int __init epit_clockevent_init(struct clk *timer_clk) -{ - unsigned int c = clk_get_rate(timer_clk); - - clockevent_epit.mult = div_sc(c, NSEC_PER_SEC, - clockevent_epit.shift); - clockevent_epit.max_delta_ns = - clockevent_delta2ns(0xfffffffe, &clockevent_epit); - clockevent_epit.min_delta_ns = - clockevent_delta2ns(0x800, &clockevent_epit); - - clockevent_epit.cpumask = cpumask_of(0); - - clockevents_register_device(&clockevent_epit); - - return 0; -} - -void __init epit_timer_init(void __iomem *base, int irq) -{ - struct clk *timer_clk; - - timer_clk = clk_get_sys("imx-epit.0", NULL); - if (IS_ERR(timer_clk)) { - pr_err("i.MX epit: unable to get clk\n"); - return; - } - - clk_prepare_enable(timer_clk); - - timer_base = base; - - /* - * Initialise to a known state (all timers off, and timing reset) - */ - __raw_writel(0x0, timer_base + EPITCR); - - __raw_writel(0xffffffff, timer_base + EPITLR); - __raw_writel(EPITCR_EN | EPITCR_CLKSRC_REF_HIGH | EPITCR_WAITEN, - timer_base + EPITCR); - - /* init and register the timer to the framework */ - epit_clocksource_init(timer_clk); - epit_clockevent_init(timer_clk); - - /* Make irqs happen */ - setup_irq(irq, &epit_timer_irq); -} |
