mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-21 08:46:49 +07:00
d330615b90
In the original driver it is missed to setup a free running driver. This timer is needed for the scheduler. So setup it. Signed-off-by: Hans Ulli Kroll <ulli.kroll@googlemail.com> Reviewed-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Olof Johansson <olof@lixom.net>
240 lines
6.2 KiB
C
240 lines
6.2 KiB
C
/*
|
|
* Copyright (C) 2001-2006 Storlink, Corp.
|
|
* Copyright (C) 2008-2009 Paulius Zaleckas <paulius.zaleckas@teltonika.lt>
|
|
*
|
|
* 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.
|
|
*/
|
|
#include <linux/interrupt.h>
|
|
#include <linux/irq.h>
|
|
#include <linux/io.h>
|
|
#include <mach/hardware.h>
|
|
#include <mach/global_reg.h>
|
|
#include <asm/mach/time.h>
|
|
#include <linux/clockchips.h>
|
|
#include <linux/clocksource.h>
|
|
#include <linux/sched_clock.h>
|
|
|
|
/*
|
|
* Register definitions for the timers
|
|
*/
|
|
|
|
#define TIMER1_BASE GEMINI_TIMER_BASE
|
|
#define TIMER2_BASE (GEMINI_TIMER_BASE + 0x10)
|
|
#define TIMER3_BASE (GEMINI_TIMER_BASE + 0x20)
|
|
|
|
#define TIMER_COUNT(BASE) (IO_ADDRESS(BASE) + 0x00)
|
|
#define TIMER_LOAD(BASE) (IO_ADDRESS(BASE) + 0x04)
|
|
#define TIMER_MATCH1(BASE) (IO_ADDRESS(BASE) + 0x08)
|
|
#define TIMER_MATCH2(BASE) (IO_ADDRESS(BASE) + 0x0C)
|
|
#define TIMER_CR (IO_ADDRESS(GEMINI_TIMER_BASE) + 0x30)
|
|
#define TIMER_INTR_STATE (IO_ADDRESS(GEMINI_TIMER_BASE) + 0x34)
|
|
#define TIMER_INTR_MASK (IO_ADDRESS(GEMINI_TIMER_BASE) + 0x38)
|
|
|
|
#define TIMER_1_CR_ENABLE (1 << 0)
|
|
#define TIMER_1_CR_CLOCK (1 << 1)
|
|
#define TIMER_1_CR_INT (1 << 2)
|
|
#define TIMER_2_CR_ENABLE (1 << 3)
|
|
#define TIMER_2_CR_CLOCK (1 << 4)
|
|
#define TIMER_2_CR_INT (1 << 5)
|
|
#define TIMER_3_CR_ENABLE (1 << 6)
|
|
#define TIMER_3_CR_CLOCK (1 << 7)
|
|
#define TIMER_3_CR_INT (1 << 8)
|
|
#define TIMER_1_CR_UPDOWN (1 << 9)
|
|
#define TIMER_2_CR_UPDOWN (1 << 10)
|
|
#define TIMER_3_CR_UPDOWN (1 << 11)
|
|
#define TIMER_DEFAULT_FLAGS (TIMER_1_CR_UPDOWN | \
|
|
TIMER_3_CR_ENABLE | \
|
|
TIMER_3_CR_UPDOWN)
|
|
|
|
#define TIMER_1_INT_MATCH1 (1 << 0)
|
|
#define TIMER_1_INT_MATCH2 (1 << 1)
|
|
#define TIMER_1_INT_OVERFLOW (1 << 2)
|
|
#define TIMER_2_INT_MATCH1 (1 << 3)
|
|
#define TIMER_2_INT_MATCH2 (1 << 4)
|
|
#define TIMER_2_INT_OVERFLOW (1 << 5)
|
|
#define TIMER_3_INT_MATCH1 (1 << 6)
|
|
#define TIMER_3_INT_MATCH2 (1 << 7)
|
|
#define TIMER_3_INT_OVERFLOW (1 << 8)
|
|
#define TIMER_INT_ALL_MASK 0x1ff
|
|
|
|
|
|
static unsigned int tick_rate;
|
|
|
|
static u64 notrace gemini_read_sched_clock(void)
|
|
{
|
|
return readl(TIMER_COUNT(TIMER3_BASE));
|
|
}
|
|
|
|
static int gemini_timer_set_next_event(unsigned long cycles,
|
|
struct clock_event_device *evt)
|
|
{
|
|
u32 cr;
|
|
|
|
/* Setup the match register */
|
|
cr = readl(TIMER_COUNT(TIMER1_BASE));
|
|
writel(cr + cycles, TIMER_MATCH1(TIMER1_BASE));
|
|
if (readl(TIMER_COUNT(TIMER1_BASE)) - cr > cycles)
|
|
return -ETIME;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gemini_timer_shutdown(struct clock_event_device *evt)
|
|
{
|
|
u32 cr;
|
|
|
|
/*
|
|
* Disable also for oneshot: the set_next() call will arm the timer
|
|
* instead.
|
|
*/
|
|
/* Stop timer and interrupt. */
|
|
cr = readl(TIMER_CR);
|
|
cr &= ~(TIMER_1_CR_ENABLE | TIMER_1_CR_INT);
|
|
writel(cr, TIMER_CR);
|
|
|
|
/* Setup counter start from 0 */
|
|
writel(0, TIMER_COUNT(TIMER1_BASE));
|
|
writel(0, TIMER_LOAD(TIMER1_BASE));
|
|
|
|
/* enable interrupt */
|
|
cr = readl(TIMER_INTR_MASK);
|
|
cr &= ~(TIMER_1_INT_OVERFLOW | TIMER_1_INT_MATCH2);
|
|
cr |= TIMER_1_INT_MATCH1;
|
|
writel(cr, TIMER_INTR_MASK);
|
|
|
|
/* start the timer */
|
|
cr = readl(TIMER_CR);
|
|
cr |= TIMER_1_CR_ENABLE;
|
|
writel(cr, TIMER_CR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int gemini_timer_set_periodic(struct clock_event_device *evt)
|
|
{
|
|
u32 period = DIV_ROUND_CLOSEST(tick_rate, HZ);
|
|
u32 cr;
|
|
|
|
/* Stop timer and interrupt */
|
|
cr = readl(TIMER_CR);
|
|
cr &= ~(TIMER_1_CR_ENABLE | TIMER_1_CR_INT);
|
|
writel(cr, TIMER_CR);
|
|
|
|
/* Setup timer to fire at 1/HT intervals. */
|
|
cr = 0xffffffff - (period - 1);
|
|
writel(cr, TIMER_COUNT(TIMER1_BASE));
|
|
writel(cr, TIMER_LOAD(TIMER1_BASE));
|
|
|
|
/* enable interrupt on overflow */
|
|
cr = readl(TIMER_INTR_MASK);
|
|
cr &= ~(TIMER_1_INT_MATCH1 | TIMER_1_INT_MATCH2);
|
|
cr |= TIMER_1_INT_OVERFLOW;
|
|
writel(cr, TIMER_INTR_MASK);
|
|
|
|
/* Start the timer */
|
|
cr = readl(TIMER_CR);
|
|
cr |= TIMER_1_CR_ENABLE;
|
|
cr |= TIMER_1_CR_INT;
|
|
writel(cr, TIMER_CR);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Use TIMER1 as clock event */
|
|
static struct clock_event_device gemini_clockevent = {
|
|
.name = "TIMER1",
|
|
/* Reasonably fast and accurate clock event */
|
|
.rating = 300,
|
|
.shift = 32,
|
|
.features = CLOCK_EVT_FEAT_PERIODIC |
|
|
CLOCK_EVT_FEAT_ONESHOT,
|
|
.set_next_event = gemini_timer_set_next_event,
|
|
.set_state_shutdown = gemini_timer_shutdown,
|
|
.set_state_periodic = gemini_timer_set_periodic,
|
|
.set_state_oneshot = gemini_timer_shutdown,
|
|
.tick_resume = gemini_timer_shutdown,
|
|
};
|
|
|
|
/*
|
|
* IRQ handler for the timer
|
|
*/
|
|
static irqreturn_t gemini_timer_interrupt(int irq, void *dev_id)
|
|
{
|
|
struct clock_event_device *evt = &gemini_clockevent;
|
|
|
|
evt->event_handler(evt);
|
|
return IRQ_HANDLED;
|
|
}
|
|
|
|
static struct irqaction gemini_timer_irq = {
|
|
.name = "Gemini Timer Tick",
|
|
.flags = IRQF_TIMER,
|
|
.handler = gemini_timer_interrupt,
|
|
};
|
|
|
|
/*
|
|
* Set up timer interrupt, and return the current time in seconds.
|
|
*/
|
|
void __init gemini_timer_init(void)
|
|
{
|
|
u32 reg_v;
|
|
|
|
reg_v = readl(IO_ADDRESS(GEMINI_GLOBAL_BASE + GLOBAL_STATUS));
|
|
tick_rate = REG_TO_AHB_SPEED(reg_v) * 1000000;
|
|
|
|
printk(KERN_INFO "Bus: %dMHz", tick_rate / 1000000);
|
|
|
|
tick_rate /= 6; /* APB bus run AHB*(1/6) */
|
|
|
|
switch(reg_v & CPU_AHB_RATIO_MASK) {
|
|
case CPU_AHB_1_1:
|
|
printk(KERN_CONT "(1/1)\n");
|
|
break;
|
|
case CPU_AHB_3_2:
|
|
printk(KERN_CONT "(3/2)\n");
|
|
break;
|
|
case CPU_AHB_24_13:
|
|
printk(KERN_CONT "(24/13)\n");
|
|
break;
|
|
case CPU_AHB_2_1:
|
|
printk(KERN_CONT "(2/1)\n");
|
|
break;
|
|
}
|
|
|
|
/*
|
|
* Reset the interrupt mask and status
|
|
*/
|
|
writel(TIMER_INT_ALL_MASK, TIMER_INTR_MASK);
|
|
writel(0, TIMER_INTR_STATE);
|
|
writel(TIMER_DEFAULT_FLAGS, TIMER_CR);
|
|
|
|
/*
|
|
* Setup free-running clocksource timer (interrupts
|
|
* disabled.)
|
|
*/
|
|
writel(0, TIMER_COUNT(TIMER3_BASE));
|
|
writel(0, TIMER_LOAD(TIMER3_BASE));
|
|
writel(0, TIMER_MATCH1(TIMER3_BASE));
|
|
writel(0, TIMER_MATCH2(TIMER3_BASE));
|
|
clocksource_mmio_init(TIMER_COUNT(TIMER3_BASE),
|
|
"gemini_clocksource", tick_rate,
|
|
300, 32, clocksource_mmio_readl_up);
|
|
sched_clock_register(gemini_read_sched_clock, 32, tick_rate);
|
|
|
|
/*
|
|
* Setup clockevent timer (interrupt-driven.)
|
|
*/
|
|
writel(0, TIMER_COUNT(TIMER1_BASE));
|
|
writel(0, TIMER_LOAD(TIMER1_BASE));
|
|
writel(0, TIMER_MATCH1(TIMER1_BASE));
|
|
writel(0, TIMER_MATCH2(TIMER1_BASE));
|
|
setup_irq(IRQ_TIMER1, &gemini_timer_irq);
|
|
gemini_clockevent.cpumask = cpumask_of(0);
|
|
clockevents_config_and_register(&gemini_clockevent, tick_rate,
|
|
1, 0xffffffff);
|
|
|
|
}
|