clocksource: sunxi: Add Allwinner A1X Timer Driver

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
CC: Thomas Gleixner <tglx@linutronix.de>
CC: John Stultz <johnstul@us.ibm.com>
This commit is contained in:
Maxime Ripard 2012-11-12 15:07:50 +01:00
parent 404525d5a7
commit b2ac5d7549
5 changed files with 215 additions and 0 deletions

View File

@ -0,0 +1,17 @@
Allwinner A1X SoCs Timer Controller
Required properties:
- compatible : should be "allwinner,sunxi-timer"
- reg : Specifies base physical address and size of the registers.
- interrupts : The interrupt of the first timer
- clocks: phandle to the source clock (usually a 24 MHz fixed clock)
Example:
timer {
compatible = "allwinner,sunxi-timer";
reg = <0x01c20c00 0x400>;
interrupts = <22>;
clocks = <&osc>;
};

View File

@ -22,6 +22,9 @@ config DW_APB_TIMER_OF
config ARMADA_370_XP_TIMER
bool
config SUNXI_TIMER
bool
config CLKSRC_DBX500_PRCMU
bool "Clocksource PRCMU Timer"
depends on UX500_SOC_DB8500

View File

@ -14,5 +14,6 @@ obj-$(CONFIG_DW_APB_TIMER_OF) += dw_apb_timer_of.o
obj-$(CONFIG_CLKSRC_DBX500_PRCMU) += clksrc-dbx500-prcmu.o
obj-$(CONFIG_ARMADA_370_XP_TIMER) += time-armada-370-xp.o
obj-$(CONFIG_ARCH_BCM2835) += bcm2835_timer.o
obj-$(CONFIG_SUNXI_TIMER) += sunxi_timer.o
obj-$(CONFIG_CLKSRC_ARM_GENERIC) += arm_generic.o

View File

@ -0,0 +1,170 @@
/*
* Allwinner A1X SoCs timer handling.
*
* Copyright (C) 2012 Maxime Ripard
*
* Maxime Ripard <maxime.ripard@free-electrons.com>
*
* Based on code from
* Allwinner Technology Co., Ltd. <www.allwinnertech.com>
* Benn Huang <benn@allwinnertech.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.
*/
#include <linux/clk.h>
#include <linux/clockchips.h>
#include <linux/interrupt.h>
#include <linux/irq.h>
#include <linux/irqreturn.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/of_irq.h>
#include <linux/sunxi_timer.h>
#include <linux/clk/sunxi.h>
#define TIMER_CTL_REG 0x00
#define TIMER_CTL_ENABLE (1 << 0)
#define TIMER_IRQ_ST_REG 0x04
#define TIMER0_CTL_REG 0x10
#define TIMER0_CTL_ENABLE (1 << 0)
#define TIMER0_CTL_AUTORELOAD (1 << 1)
#define TIMER0_CTL_ONESHOT (1 << 7)
#define TIMER0_INTVAL_REG 0x14
#define TIMER0_CNTVAL_REG 0x18
#define TIMER_SCAL 16
static void __iomem *timer_base;
static void sunxi_clkevt_mode(enum clock_event_mode mode,
struct clock_event_device *clk)
{
u32 u = readl(timer_base + TIMER0_CTL_REG);
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
u &= ~(TIMER0_CTL_ONESHOT);
writel(u | TIMER0_CTL_ENABLE, timer_base + TIMER0_CTL_REG);
break;
case CLOCK_EVT_MODE_ONESHOT:
writel(u | TIMER0_CTL_ONESHOT, timer_base + TIMER0_CTL_REG);
break;
case CLOCK_EVT_MODE_UNUSED:
case CLOCK_EVT_MODE_SHUTDOWN:
default:
writel(u & ~(TIMER0_CTL_ENABLE), timer_base + TIMER0_CTL_REG);
break;
}
}
static int sunxi_clkevt_next_event(unsigned long evt,
struct clock_event_device *unused)
{
u32 u = readl(timer_base + TIMER0_CTL_REG);
writel(evt, timer_base + TIMER0_CNTVAL_REG);
writel(u | TIMER0_CTL_ENABLE | TIMER0_CTL_AUTORELOAD,
timer_base + TIMER0_CTL_REG);
return 0;
}
static struct clock_event_device sunxi_clockevent = {
.name = "sunxi_tick",
.shift = 32,
.rating = 300,
.features = CLOCK_EVT_FEAT_PERIODIC | CLOCK_EVT_FEAT_ONESHOT,
.set_mode = sunxi_clkevt_mode,
.set_next_event = sunxi_clkevt_next_event,
};
static irqreturn_t sunxi_timer_interrupt(int irq, void *dev_id)
{
struct clock_event_device *evt = (struct clock_event_device *)dev_id;
writel(0x1, timer_base + TIMER_IRQ_ST_REG);
evt->event_handler(evt);
return IRQ_HANDLED;
}
static struct irqaction sunxi_timer_irq = {
.name = "sunxi_timer0",
.flags = IRQF_DISABLED | IRQF_TIMER | IRQF_IRQPOLL,
.handler = sunxi_timer_interrupt,
.dev_id = &sunxi_clockevent,
};
static struct of_device_id sunxi_timer_dt_ids[] = {
{ .compatible = "allwinner,sunxi-timer" },
};
static void __init sunxi_timer_init(void)
{
struct device_node *node;
unsigned long rate = 0;
struct clk *clk;
int ret, irq;
u32 val;
node = of_find_matching_node(NULL, sunxi_timer_dt_ids);
if (!node)
panic("No sunxi timer node");
timer_base = of_iomap(node, 0);
if (!timer_base)
panic("Can't map registers");
irq = irq_of_parse_and_map(node, 0);
if (irq <= 0)
panic("Can't parse IRQ");
sunxi_init_clocks();
clk = of_clk_get(node, 0);
if (IS_ERR(clk))
panic("Can't get timer clock");
rate = clk_get_rate(clk);
writel(rate / (TIMER_SCAL * HZ),
timer_base + TIMER0_INTVAL_REG);
/* set clock source to HOSC, 16 pre-division */
val = readl(timer_base + TIMER0_CTL_REG);
val &= ~(0x07 << 4);
val &= ~(0x03 << 2);
val |= (4 << 4) | (1 << 2);
writel(val, timer_base + TIMER0_CTL_REG);
/* set mode to auto reload */
val = readl(timer_base + TIMER0_CTL_REG);
writel(val | TIMER0_CTL_AUTORELOAD, timer_base + TIMER0_CTL_REG);
ret = setup_irq(irq, &sunxi_timer_irq);
if (ret)
pr_warn("failed to setup irq %d\n", irq);
/* Enable timer0 interrupt */
val = readl(timer_base + TIMER_CTL_REG);
writel(val | TIMER_CTL_ENABLE, timer_base + TIMER_CTL_REG);
sunxi_clockevent.mult = div_sc(rate / TIMER_SCAL,
NSEC_PER_SEC,
sunxi_clockevent.shift);
sunxi_clockevent.max_delta_ns = clockevent_delta2ns(0xff,
&sunxi_clockevent);
sunxi_clockevent.min_delta_ns = clockevent_delta2ns(0x1,
&sunxi_clockevent);
sunxi_clockevent.cpumask = cpumask_of(0);
clockevents_register_device(&sunxi_clockevent);
}
struct sys_timer sunxi_timer = {
.init = sunxi_timer_init,
};

View File

@ -0,0 +1,24 @@
/*
* Copyright 2012 Maxime Ripard
*
* Maxime Ripard <maxime.ripard@free-electrons.com>
*
* 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.
*/
#ifndef __SUNXI_TIMER_H
#define __SUNXI_TIMER_H
#include <asm/mach/time.h>
extern struct sys_timer sunxi_timer;
#endif