+++ /dev/null
-/*
- * linux/arch/arm/plat-mxc/time.c
- *
- * Copyright (C) 2000-2001 Deep Blue Solutions
- * Copyright (C) 2002 Shane Nay (shane@minirl.com)
- * Copyright (C) 2006-2007 Pavel Pisa (ppisa@pikron.com)
- * Copyright (C) 2008 Juergen Beisert (kernel@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.
- */
-
-#include <linux/interrupt.h>
-#include <linux/irq.h>
-#include <linux/clockchips.h>
-#include <linux/clk.h>
-#include <linux/delay.h>
-#include <linux/err.h>
-#include <linux/sched_clock.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
-#include <linux/of_irq.h>
-
-#include <asm/mach/time.h>
-
-#include "common.h"
-#include "hardware.h"
-
-/*
- * There are 2 versions of the timer hardware on Freescale MXC hardware.
- * Version 1: MX1/MXL, MX21, MX27.
- * Version 2: MX25, MX31, MX35, MX37, MX51
- */
-
-/* defines common for all i.MX */
-#define MXC_TCTL 0x00
-#define MXC_TCTL_TEN (1 << 0) /* Enable module */
-#define MXC_TPRER 0x04
-
-/* MX1, MX21, MX27 */
-#define MX1_2_TCTL_CLK_PCLK1 (1 << 1)
-#define MX1_2_TCTL_IRQEN (1 << 4)
-#define MX1_2_TCTL_FRR (1 << 8)
-#define MX1_2_TCMP 0x08
-#define MX1_2_TCN 0x10
-#define MX1_2_TSTAT 0x14
-
-/* MX21, MX27 */
-#define MX2_TSTAT_CAPT (1 << 1)
-#define MX2_TSTAT_COMP (1 << 0)
-
-/* MX31, MX35, MX25, MX5, MX6 */
-#define V2_TCTL_WAITEN (1 << 3) /* Wait enable mode */
-#define V2_TCTL_CLK_IPG (1 << 6)
-#define V2_TCTL_CLK_PER (2 << 6)
-#define V2_TCTL_CLK_OSC_DIV8 (5 << 6)
-#define V2_TCTL_FRR (1 << 9)
-#define V2_TCTL_24MEN (1 << 10)
-#define V2_TPRER_PRE24M 12
-#define V2_IR 0x0c
-#define V2_TSTAT 0x08
-#define V2_TSTAT_OF1 (1 << 0)
-#define V2_TCN 0x24
-#define V2_TCMP 0x10
-
-#define V2_TIMER_RATE_OSC_DIV8 3000000
-
-#define timer_is_v1() (cpu_is_mx1() || cpu_is_mx21() || cpu_is_mx27())
-#define timer_is_v2() (!timer_is_v1())
-
-static struct clock_event_device clockevent_mxc;
-static enum clock_event_mode clockevent_mode = CLOCK_EVT_MODE_UNUSED;
-
-static void __iomem *timer_base;
-
-static inline void gpt_irq_disable(void)
-{
- unsigned int tmp;
-
- if (timer_is_v2())
- __raw_writel(0, timer_base + V2_IR);
- else {
- tmp = __raw_readl(timer_base + MXC_TCTL);
- __raw_writel(tmp & ~MX1_2_TCTL_IRQEN, timer_base + MXC_TCTL);
- }
-}
-
-static inline void gpt_irq_enable(void)
-{
- if (timer_is_v2())
- __raw_writel(1<<0, timer_base + V2_IR);
- else {
- __raw_writel(__raw_readl(timer_base + MXC_TCTL) | MX1_2_TCTL_IRQEN,
- timer_base + MXC_TCTL);
- }
-}
-
-static void gpt_irq_acknowledge(void)
-{
- if (timer_is_v1()) {
- if (cpu_is_mx1())
- __raw_writel(0, timer_base + MX1_2_TSTAT);
- else
- __raw_writel(MX2_TSTAT_CAPT | MX2_TSTAT_COMP,
- timer_base + MX1_2_TSTAT);
- } else if (timer_is_v2())
- __raw_writel(V2_TSTAT_OF1, timer_base + V2_TSTAT);
-}
-
-static void __iomem *sched_clock_reg;
-
-static u64 notrace mxc_read_sched_clock(void)
-{
- return sched_clock_reg ? __raw_readl(sched_clock_reg) : 0;
-}
-
-static struct delay_timer imx_delay_timer;
-
-static unsigned long imx_read_current_timer(void)
-{
- return __raw_readl(sched_clock_reg);
-}
-
-static int __init mxc_clocksource_init(struct clk *timer_clk)
-{
- unsigned int c = clk_get_rate(timer_clk);
- void __iomem *reg = timer_base + (timer_is_v2() ? V2_TCN : MX1_2_TCN);
-
- pr_info("mxc_clocksource_init %d\n", c);
- imx_delay_timer.read_current_timer = &imx_read_current_timer;
- imx_delay_timer.freq = c;
- register_current_timer_delay(&imx_delay_timer);
-
- sched_clock_reg = reg;
-
- sched_clock_register(mxc_read_sched_clock, 32, c);
- return clocksource_mmio_init(reg, "mxc_timer1", c, 200, 32,
- clocksource_mmio_readl_up);
-}
-
-/* clock event */
-
-static int mx1_2_set_next_event(unsigned long evt,
- struct clock_event_device *unused)
-{
- unsigned long tcmp;
-
- tcmp = __raw_readl(timer_base + MX1_2_TCN) + evt;
-
- __raw_writel(tcmp, timer_base + MX1_2_TCMP);
-
- return (int)(tcmp - __raw_readl(timer_base + MX1_2_TCN)) < 0 ?
- -ETIME : 0;
-}
-
-static int v2_set_next_event(unsigned long evt,
- struct clock_event_device *unused)
-{
- unsigned long tcmp;
-
- tcmp = __raw_readl(timer_base + V2_TCN) + evt;
-
- __raw_writel(tcmp, timer_base + V2_TCMP);
-
- return evt < 0x7fffffff &&
- (int)(tcmp - __raw_readl(timer_base + V2_TCN)) < 0 ?
- -ETIME : 0;
-}
-
-#ifdef DEBUG
-static const char *clock_event_mode_label[] = {
- [CLOCK_EVT_MODE_PERIODIC] = "CLOCK_EVT_MODE_PERIODIC",
- [CLOCK_EVT_MODE_ONESHOT] = "CLOCK_EVT_MODE_ONESHOT",
- [CLOCK_EVT_MODE_SHUTDOWN] = "CLOCK_EVT_MODE_SHUTDOWN",
- [CLOCK_EVT_MODE_UNUSED] = "CLOCK_EVT_MODE_UNUSED",
- [CLOCK_EVT_MODE_RESUME] = "CLOCK_EVT_MODE_RESUME",
-};
-#endif /* DEBUG */
-
-static void mxc_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 mxc_set_next_event()
- */
- local_irq_save(flags);
-
- /* Disable interrupt in GPT module */
- gpt_irq_disable();
-
- if (mode != clockevent_mode) {
- /* Set event time into far-far future */
- if (timer_is_v2())
- __raw_writel(__raw_readl(timer_base + V2_TCN) - 3,
- timer_base + V2_TCMP);
- else
- __raw_writel(__raw_readl(timer_base + MX1_2_TCN) - 3,
- timer_base + MX1_2_TCMP);
-
- /* Clear pending interrupt */
- gpt_irq_acknowledge();
- }
-
-#ifdef DEBUG
- printk(KERN_INFO "mxc_set_mode: changing mode from %s to %s\n",
- clock_event_mode_label[clockevent_mode],
- clock_event_mode_label[mode]);
-#endif /* DEBUG */
-
- /* Remember timer mode */
- clockevent_mode = mode;
- local_irq_restore(flags);
-
- switch (mode) {
- case CLOCK_EVT_MODE_PERIODIC:
- printk(KERN_ERR"mxc_set_mode: Periodic mode is not "
- "supported for i.MX\n");
- break;
- case CLOCK_EVT_MODE_ONESHOT:
- /*
- * Do not put overhead of interrupt enable/disable into
- * mxc_set_next_event(), the core has about 4 minutes
- * to call mxc_set_next_event() or shutdown clock after
- * mode switching
- */
- local_irq_save(flags);
- gpt_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 mxc_timer_interrupt(int irq, void *dev_id)
-{
- struct clock_event_device *evt = &clockevent_mxc;
- uint32_t tstat;
-
- if (timer_is_v2())
- tstat = __raw_readl(timer_base + V2_TSTAT);
- else
- tstat = __raw_readl(timer_base + MX1_2_TSTAT);
-
- gpt_irq_acknowledge();
-
- evt->event_handler(evt);
-
- return IRQ_HANDLED;
-}
-
-static struct irqaction mxc_timer_irq = {
- .name = "i.MX Timer Tick",
- .flags = IRQF_TIMER | IRQF_IRQPOLL,
- .handler = mxc_timer_interrupt,
-};
-
-static struct clock_event_device clockevent_mxc = {
- .name = "mxc_timer1",
- .features = CLOCK_EVT_FEAT_ONESHOT,
- .set_mode = mxc_set_mode,
- .set_next_event = mx1_2_set_next_event,
- .rating = 200,
-};
-
-static int __init mxc_clockevent_init(struct clk *timer_clk)
-{
- if (timer_is_v2())
- clockevent_mxc.set_next_event = v2_set_next_event;
-
- clockevent_mxc.cpumask = cpumask_of(0);
- clockevents_config_and_register(&clockevent_mxc,
- clk_get_rate(timer_clk),
- 0xff, 0xfffffffe);
-
- return 0;
-}
-
-static void __init _mxc_timer_init(int irq,
- struct clk *clk_per, struct clk *clk_ipg)
-{
- uint32_t tctl_val;
-
- if (IS_ERR(clk_per)) {
- pr_err("i.MX timer: unable to get clk\n");
- return;
- }
-
- if (!IS_ERR(clk_ipg))
- clk_prepare_enable(clk_ipg);
-
- clk_prepare_enable(clk_per);
-
- /*
- * Initialise to a known state (all timers off, and timing reset)
- */
-
- __raw_writel(0, timer_base + MXC_TCTL);
- __raw_writel(0, timer_base + MXC_TPRER); /* see datasheet note */
-
- if (timer_is_v2()) {
- tctl_val = V2_TCTL_FRR | V2_TCTL_WAITEN | MXC_TCTL_TEN;
- if (clk_get_rate(clk_per) == V2_TIMER_RATE_OSC_DIV8) {
- tctl_val |= V2_TCTL_CLK_OSC_DIV8;
- if (cpu_is_imx6dl() || cpu_is_imx6sll() ||
- cpu_is_imx6sx() || cpu_is_imx6ul() ||
- cpu_is_imx6ull() || cpu_is_imx7d()) {
- /* 24 / 8 = 3 MHz */
- __raw_writel(7 << V2_TPRER_PRE24M,
- timer_base + MXC_TPRER);
- tctl_val |= V2_TCTL_24MEN;
- }
- } else {
- tctl_val |= V2_TCTL_CLK_PER;
- }
- } else {
- tctl_val = MX1_2_TCTL_FRR | MX1_2_TCTL_CLK_PCLK1 | MXC_TCTL_TEN;
- }
-
- __raw_writel(tctl_val, timer_base + MXC_TCTL);
-
- /* init and register the timer to the framework */
- mxc_clocksource_init(clk_per);
- mxc_clockevent_init(clk_per);
-
- /* Make irqs happen */
- setup_irq(irq, &mxc_timer_irq);
-}
-
-void __init mxc_timer_init(void __iomem *base, int irq)
-{
- struct clk *clk_per = clk_get_sys("imx-gpt.0", "per");
- struct clk *clk_ipg = clk_get_sys("imx-gpt.0", "ipg");
-
- timer_base = base;
-
- _mxc_timer_init(irq, clk_per, clk_ipg);
-}
-
-static void __init mxc_timer_init_dt(struct device_node *np)
-{
- struct clk *clk_per, *clk_ipg;
- int irq;
-
- if (timer_base)
- return;
-
- timer_base = of_iomap(np, 0);
- WARN_ON(!timer_base);
- irq = irq_of_parse_and_map(np, 0);
-
- clk_ipg = of_clk_get_by_name(np, "ipg");
-
- /* Try osc_per first, and fall back to per otherwise */
- clk_per = of_clk_get_by_name(np, "osc_per");
- if (IS_ERR(clk_per))
- clk_per = of_clk_get_by_name(np, "per");
-
- _mxc_timer_init(irq, clk_per, clk_ipg);
-}
-CLOCKSOURCE_OF_DECLARE(mx1_timer, "fsl,imx1-gpt", mxc_timer_init_dt);
-CLOCKSOURCE_OF_DECLARE(mx25_timer, "fsl,imx25-gpt", mxc_timer_init_dt);
-CLOCKSOURCE_OF_DECLARE(mx50_timer, "fsl,imx50-gpt", mxc_timer_init_dt);
-CLOCKSOURCE_OF_DECLARE(mx51_timer, "fsl,imx51-gpt", mxc_timer_init_dt);
-CLOCKSOURCE_OF_DECLARE(mx53_timer, "fsl,imx53-gpt", mxc_timer_init_dt);
-CLOCKSOURCE_OF_DECLARE(mx6q_timer, "fsl,imx6q-gpt", mxc_timer_init_dt);
-CLOCKSOURCE_OF_DECLARE(mx6sl_timer, "fsl,imx6sl-gpt", mxc_timer_init_dt);
-CLOCKSOURCE_OF_DECLARE(mx6sll_timer, "fsl,imx6sll-gpt", mxc_timer_init_dt);
-CLOCKSOURCE_OF_DECLARE(mx6sx_timer, "fsl,imx6sx-gpt", mxc_timer_init_dt);
-CLOCKSOURCE_OF_DECLARE(mx6ul_timer, "fsl,imx6ul-gpt", mxc_timer_init_dt);
-CLOCKSOURCE_OF_DECLARE(mx6ul_timer, "fsl,imx6ull-gpt", mxc_timer_init_dt);
-CLOCKSOURCE_OF_DECLARE(mx7d_timer, "fsl,imx7d-gpt", mxc_timer_init_dt);
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