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-rw-r--r--arch/arm/plat-nomadik/timer.c223
1 files changed, 0 insertions, 223 deletions
diff --git a/arch/arm/plat-nomadik/timer.c b/arch/arm/plat-nomadik/timer.c
deleted file mode 100644
index 9222e5522a4..00000000000
--- a/arch/arm/plat-nomadik/timer.c
+++ /dev/null
@@ -1,223 +0,0 @@
-/*
- * linux/arch/arm/plat-nomadik/timer.c
- *
- * Copyright (C) 2008 STMicroelectronics
- * Copyright (C) 2010 Alessandro Rubini
- * Copyright (C) 2010 Linus Walleij for ST-Ericsson
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2, as
- * published by the Free Software Foundation.
- */
-#include <linux/init.h>
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/io.h>
-#include <linux/clockchips.h>
-#include <linux/clk.h>
-#include <linux/jiffies.h>
-#include <linux/err.h>
-#include <asm/mach/time.h>
-#include <asm/sched_clock.h>
-
-/*
- * The MTU device hosts four different counters, with 4 set of
- * registers. These are register names.
- */
-
-#define MTU_IMSC 0x00 /* Interrupt mask set/clear */
-#define MTU_RIS 0x04 /* Raw interrupt status */
-#define MTU_MIS 0x08 /* Masked interrupt status */
-#define MTU_ICR 0x0C /* Interrupt clear register */
-
-/* per-timer registers take 0..3 as argument */
-#define MTU_LR(x) (0x10 + 0x10 * (x) + 0x00) /* Load value */
-#define MTU_VAL(x) (0x10 + 0x10 * (x) + 0x04) /* Current value */
-#define MTU_CR(x) (0x10 + 0x10 * (x) + 0x08) /* Control reg */
-#define MTU_BGLR(x) (0x10 + 0x10 * (x) + 0x0c) /* At next overflow */
-
-/* bits for the control register */
-#define MTU_CRn_ENA 0x80
-#define MTU_CRn_PERIODIC 0x40 /* if 0 = free-running */
-#define MTU_CRn_PRESCALE_MASK 0x0c
-#define MTU_CRn_PRESCALE_1 0x00
-#define MTU_CRn_PRESCALE_16 0x04
-#define MTU_CRn_PRESCALE_256 0x08
-#define MTU_CRn_32BITS 0x02
-#define MTU_CRn_ONESHOT 0x01 /* if 0 = wraps reloading from BGLR*/
-
-/* Other registers are usual amba/primecell registers, currently not used */
-#define MTU_ITCR 0xff0
-#define MTU_ITOP 0xff4
-
-#define MTU_PERIPH_ID0 0xfe0
-#define MTU_PERIPH_ID1 0xfe4
-#define MTU_PERIPH_ID2 0xfe8
-#define MTU_PERIPH_ID3 0xfeC
-
-#define MTU_PCELL0 0xff0
-#define MTU_PCELL1 0xff4
-#define MTU_PCELL2 0xff8
-#define MTU_PCELL3 0xffC
-
-static void __iomem *mtu_base;
-static bool clkevt_periodic;
-static u32 clk_prescale;
-static u32 nmdk_cycle; /* write-once */
-
-#ifdef CONFIG_NOMADIK_MTU_SCHED_CLOCK
-/*
- * Override the global weak sched_clock symbol with this
- * local implementation which uses the clocksource to get some
- * better resolution when scheduling the kernel.
- */
-static u32 notrace nomadik_read_sched_clock(void)
-{
- if (unlikely(!mtu_base))
- return 0;
-
- return -readl(mtu_base + MTU_VAL(0));
-}
-#endif
-
-/* Clockevent device: use one-shot mode */
-static int nmdk_clkevt_next(unsigned long evt, struct clock_event_device *ev)
-{
- writel(1 << 1, mtu_base + MTU_IMSC);
- writel(evt, mtu_base + MTU_LR(1));
- /* Load highest value, enable device, enable interrupts */
- writel(MTU_CRn_ONESHOT | clk_prescale |
- MTU_CRn_32BITS | MTU_CRn_ENA,
- mtu_base + MTU_CR(1));
-
- return 0;
-}
-
-void nmdk_clkevt_reset(void)
-{
- if (clkevt_periodic) {
- /* Timer: configure load and background-load, and fire it up */
- writel(nmdk_cycle, mtu_base + MTU_LR(1));
- writel(nmdk_cycle, mtu_base + MTU_BGLR(1));
-
- writel(MTU_CRn_PERIODIC | clk_prescale |
- MTU_CRn_32BITS | MTU_CRn_ENA,
- mtu_base + MTU_CR(1));
- writel(1 << 1, mtu_base + MTU_IMSC);
- } else {
- /* Generate an interrupt to start the clockevent again */
- (void) nmdk_clkevt_next(nmdk_cycle, NULL);
- }
-}
-
-static void nmdk_clkevt_mode(enum clock_event_mode mode,
- struct clock_event_device *dev)
-{
- switch (mode) {
- case CLOCK_EVT_MODE_PERIODIC:
- clkevt_periodic = true;
- nmdk_clkevt_reset();
- break;
- case CLOCK_EVT_MODE_ONESHOT:
- clkevt_periodic = false;
- break;
- case CLOCK_EVT_MODE_SHUTDOWN:
- case CLOCK_EVT_MODE_UNUSED:
- writel(0, mtu_base + MTU_IMSC);
- /* disable timer */
- writel(0, mtu_base + MTU_CR(1));
- /* load some high default value */
- writel(0xffffffff, mtu_base + MTU_LR(1));
- break;
- case CLOCK_EVT_MODE_RESUME:
- break;
- }
-}
-
-static struct clock_event_device nmdk_clkevt = {
- .name = "mtu_1",
- .features = CLOCK_EVT_FEAT_ONESHOT | CLOCK_EVT_FEAT_PERIODIC,
- .rating = 200,
- .set_mode = nmdk_clkevt_mode,
- .set_next_event = nmdk_clkevt_next,
-};
-
-/*
- * IRQ Handler for timer 1 of the MTU block.
- */
-static irqreturn_t nmdk_timer_interrupt(int irq, void *dev_id)
-{
- struct clock_event_device *evdev = dev_id;
-
- writel(1 << 1, mtu_base + MTU_ICR); /* Interrupt clear reg */
- evdev->event_handler(evdev);
- return IRQ_HANDLED;
-}
-
-static struct irqaction nmdk_timer_irq = {
- .name = "Nomadik Timer Tick",
- .flags = IRQF_DISABLED | IRQF_TIMER,
- .handler = nmdk_timer_interrupt,
- .dev_id = &nmdk_clkevt,
-};
-
-void nmdk_clksrc_reset(void)
-{
- /* Disable */
- writel(0, mtu_base + MTU_CR(0));
-
- /* ClockSource: configure load and background-load, and fire it up */
- writel(nmdk_cycle, mtu_base + MTU_LR(0));
- writel(nmdk_cycle, mtu_base + MTU_BGLR(0));
-
- writel(clk_prescale | MTU_CRn_32BITS | MTU_CRn_ENA,
- mtu_base + MTU_CR(0));
-}
-
-void __init nmdk_timer_init(void __iomem *base)
-{
- unsigned long rate;
- struct clk *clk0;
-
- mtu_base = base;
- clk0 = clk_get_sys("mtu0", NULL);
- BUG_ON(IS_ERR(clk0));
- BUG_ON(clk_prepare(clk0) < 0);
- BUG_ON(clk_enable(clk0) < 0);
-
- /*
- * Tick rate is 2.4MHz for Nomadik and 2.4Mhz, 100MHz or 133 MHz
- * for ux500.
- * Use a divide-by-16 counter if the tick rate is more than 32MHz.
- * At 32 MHz, the timer (with 32 bit counter) can be programmed
- * to wake-up at a max 127s a head in time. Dividing a 2.4 MHz timer
- * with 16 gives too low timer resolution.
- */
- rate = clk_get_rate(clk0);
- if (rate > 32000000) {
- rate /= 16;
- clk_prescale = MTU_CRn_PRESCALE_16;
- } else {
- clk_prescale = MTU_CRn_PRESCALE_1;
- }
-
- nmdk_cycle = (rate + HZ/2) / HZ;
-
-
- /* Timer 0 is the free running clocksource */
- nmdk_clksrc_reset();
-
- if (clocksource_mmio_init(mtu_base + MTU_VAL(0), "mtu_0",
- rate, 200, 32, clocksource_mmio_readl_down))
- pr_err("timer: failed to initialize clock source %s\n",
- "mtu_0");
-
-#ifdef CONFIG_NOMADIK_MTU_SCHED_CLOCK
- setup_sched_clock(nomadik_read_sched_clock, 32, rate);
-#endif
-
- /* Timer 1 is used for events, register irq and clockevents */
- setup_irq(IRQ_MTU0, &nmdk_timer_irq);
- nmdk_clkevt.cpumask = cpumask_of(0);
- clockevents_config_and_register(&nmdk_clkevt, rate, 2, 0xffffffffU);
-}
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