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Third batch of cleanup for 4.1:

Browse Source 
- System Timer (ST) for at91rm9200 re-work (syscon/regmap):
   - watchdog
   - restart handler
   - timer as a proper clocksource
   => remove mach dependency + cleanup
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Merge tag 'at91-cleanup3' into at91-4.1-multiplatform

Third batch of cleanup for 4.1:
- System Timer (ST) for at91rm9200 re-work (syscon/regmap):
  - watchdog
  - restart handler
  - timer as a proper clocksource
  => remove mach dependency + cleanup
This commit is contained in:
Nicolas Ferre 2015-03-16 18:09:48 +01:00
commit 88c5544ab2
13 changed files with 164 additions and 166 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/devicetree/bindings/arm/atmel-at91.txt
View File

@ -46,10 +46,12 @@ PIT Timer required properties:
shared across all System Controller members.
System Timer (ST) required properties:
- compatible: Should be "atmel,at91rm9200-st"
- compatible: Should be "atmel,at91rm9200-st", "syscon", "simple-mfd"
- reg: Should contain registers location and length
- interrupts: Should contain interrupt for the ST which is the IRQ line
shared across all System Controller members.
Its subnodes can be:
- watchdog: compatible should be "atmel,at91rm9200-wdt"
TC/TCLIB Timer required properties:
- compatible: Should be "atmel,<chip>-tcb".

6
arch/arm/boot/dts/at91rm9200.dtsi
View File

@ -356,9 +356,13 @@
};
st: timer@fffffd00 {
compatible = "atmel,at91rm9200-st";
compatible = "atmel,at91rm9200-st", "syscon", "simple-mfd";
reg = <0xfffffd00 0x100>;
interrupts = <1 IRQ_TYPE_LEVEL_HIGH 7>;
watchdog {
compatible = "atmel,at91rm9200-wdt";
};
};
rtc: rtc@fffffe00 {

1
arch/arm/mach-at91/Kconfig
View File

@ -77,6 +77,7 @@ if SOC_SAM_V4_V5
config SOC_AT91RM9200
bool "AT91RM9200"
select ATMEL_AIC_IRQ
select ATMEL_ST
select COMMON_CLK_AT91
select CPU_ARM920T
select GENERIC_CLOCKEVENTS

2
arch/arm/mach-at91/Makefile
View File

@ -7,7 +7,7 @@ obj-y := soc.o
obj-$(CONFIG_SOC_AT91SAM9) += sam9_smc.o
# CPU-specific support
obj-$(CONFIG_SOC_AT91RM9200) += at91rm9200.o at91rm9200_time.o
obj-$(CONFIG_SOC_AT91RM9200) += at91rm9200.o
obj-$(CONFIG_SOC_AT91SAM9) += at91sam9.o
obj-$(CONFIG_SOC_SAMA5) += sama5.o

19
arch/arm/mach-at91/at91rm9200.c
View File

@ -15,8 +15,6 @@
#include <asm/mach/arch.h>
#include <asm/system_misc.h>
#include <mach/at91_st.h>
#include "generic.h"
#include "soc.h"
@ -25,21 +23,6 @@ static const struct at91_soc rm9200_socs[] = {
{ /* sentinel */ },
};
static void at91rm9200_restart(enum reboot_mode reboot_mode, const char *cmd)
{
/*
* Perform a hardware reset with the use of the Watchdog timer.
*/
at91_st_write(AT91_ST_WDMR, AT91_ST_RSTEN | AT91_ST_EXTEN | 1);
at91_st_write(AT91_ST_CR, AT91_ST_WDRST);
}
static void __init at91rm9200_dt_timer_init(void)
{
of_clk_init(NULL);
at91rm9200_timer_init();
}
static void __init at91rm9200_dt_device_init(void)
{
struct soc_device *soc;
@ -52,7 +35,6 @@ static void __init at91rm9200_dt_device_init(void)
of_platform_populate(NULL, of_default_bus_match_table, NULL, soc_dev);
arm_pm_idle = at91rm9200_idle;
arm_pm_restart = at91rm9200_restart;
at91rm9200_pm_init();
}
@ -62,7 +44,6 @@ static const char *at91rm9200_dt_board_compat[] __initconst = {
};
DT_MACHINE_START(at91rm9200_dt, "Atmel AT91RM9200")
.init_time = at91rm9200_dt_timer_init,
.init_machine = at91rm9200_dt_device_init,
.dt_compat = at91rm9200_dt_board_compat,
MACHINE_END

3
arch/arm/mach-at91/generic.h
View File

@ -18,9 +18,6 @@
extern void __init at91_map_io(void);
extern void __init at91_alt_map_io(void);
/* Timer */
extern void at91rm9200_timer_init(void);
/* idle */
extern void at91rm9200_idle(void);
extern void at91sam9_idle(void);

61
arch/arm/mach-at91/include/mach/at91_st.h
View File

@ -1,61 +0,0 @@
/*
* arch/arm/mach-at91/include/mach/at91_st.h
*
* Copyright (C) 2005 Ivan Kokshaysky
* Copyright (C) SAN People
*
* System Timer (ST) - System peripherals registers.
* Based on AT91RM9200 datasheet revision E.
*
* 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.
*/
#ifndef AT91_ST_H
#define AT91_ST_H
#ifndef __ASSEMBLY__
extern void __iomem *at91_st_base;
#define at91_st_read(field) \
__raw_readl(at91_st_base + field)
#define at91_st_write(field, value) \
__raw_writel(value, at91_st_base + field)
#else
.extern at91_st_base
#endif
#define AT91_ST_CR 0x00 /* Control Register */
#define AT91_ST_WDRST (1 << 0) /* Watchdog Timer Restart */
#define AT91_ST_PIMR 0x04 /* Period Interval Mode Register */
#define AT91_ST_PIV (0xffff << 0) /* Period Interval Value */
#define AT91_ST_WDMR 0x08 /* Watchdog Mode Register */
#define AT91_ST_WDV (0xffff << 0) /* Watchdog Counter Value */
#define AT91_ST_RSTEN (1 << 16) /* Reset Enable */
#define AT91_ST_EXTEN (1 << 17) /* External Signal Assertion Enable */
#define AT91_ST_RTMR 0x0c /* Real-time Mode Register */
#define AT91_ST_RTPRES (0xffff << 0) /* Real-time Prescalar Value */
#define AT91_ST_SR 0x10 /* Status Register */
#define AT91_ST_PITS (1 << 0) /* Period Interval Timer Status */
#define AT91_ST_WDOVF (1 << 1) /* Watchdog Overflow */
#define AT91_ST_RTTINC (1 << 2) /* Real-time Timer Increment */
#define AT91_ST_ALMS (1 << 3) /* Alarm Status */
#define AT91_ST_IER 0x14 /* Interrupt Enable Register */
#define AT91_ST_IDR 0x18 /* Interrupt Disable Register */
#define AT91_ST_IMR 0x1c /* Interrupt Mask Register */
#define AT91_ST_RTAR 0x20 /* Real-time Alarm Register */
#define AT91_ST_ALMV (0xfffff << 0) /* Alarm Value */
#define AT91_ST_CRTR 0x24 /* Current Real-time Register */
#define AT91_ST_CRTV (0xfffff << 0) /* Current Real-Time Value */
#endif

4
drivers/clocksource/Kconfig
View File

@ -143,6 +143,10 @@ config ATMEL_PIT
select CLKSRC_OF if OF
def_bool SOC_AT91SAM9 || SOC_SAMA5
config ATMEL_ST
bool
select CLKSRC_OF
config CLKSRC_METAG_GENERIC
def_bool y if METAG
help

1
drivers/clocksource/Makefile
View File

@ -1,5 +1,6 @@
obj-$(CONFIG_CLKSRC_OF) += clksrc-of.o
obj-$(CONFIG_ATMEL_PIT) += timer-atmel-pit.o
obj-$(CONFIG_ATMEL_ST) += timer-atmel-st.o
obj-$(CONFIG_ATMEL_TCB_CLKSRC) += tcb_clksrc.o
obj-$(CONFIG_X86_PM_TIMER) += acpi_pm.o
obj-$(CONFIG_SCx200HR_TIMER) += scx200_hrt.o

117
arch/arm/mach-at91/at91rm9200_time.c → drivers/clocksource/timer-atmel-st.c
View File

@ -24,19 +24,17 @@
#include <linux/irq.h>
#include <linux/clockchips.h>
#include <linux/export.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/atmel-st.h>
#include <linux/of_irq.h>
#include <asm/mach/time.h>
#include <mach/at91_st.h>
#include <mach/hardware.h>
#include <linux/regmap.h>
static unsigned long last_crtr;
static u32 irqmask;
static struct clock_event_device clkevt;
static struct regmap *regmap_st;
#define AT91_SLOW_CLOCK 32768
#define RM9200_TIMER_LATCH ((AT91_SLOW_CLOCK + HZ/2) / HZ)
/*
@ -46,11 +44,11 @@ static struct clock_event_device clkevt;
*/
static inline unsigned long read_CRTR(void)
{
unsigned long x1, x2;
unsigned int x1, x2;
x1 = at91_st_read(AT91_ST_CRTR);
regmap_read(regmap_st, AT91_ST_CRTR, &x1);
do {
x2 = at91_st_read(AT91_ST_CRTR);
regmap_read(regmap_st, AT91_ST_CRTR, &x2);
if (x1 == x2)
break;
x1 = x2;
@ -63,7 +61,10 @@ static inline unsigned long read_CRTR(void)
*/
static irqreturn_t at91rm9200_timer_interrupt(int irq, void *dev_id)
{
u32 sr = at91_st_read(AT91_ST_SR) & irqmask;
u32 sr;
regmap_read(regmap_st, AT91_ST_SR, &sr);
sr &= irqmask;
/*
* irqs should be disabled here, but as the irq is shared they are only
@ -92,13 +93,6 @@ static irqreturn_t at91rm9200_timer_interrupt(int irq, void *dev_id)
return IRQ_NONE;
}
static struct irqaction at91rm9200_timer_irq = {
.name = "at91_tick",
.flags = IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
.handler = at91rm9200_timer_interrupt,
.irq = NR_IRQS_LEGACY + AT91_ID_SYS,
};
static cycle_t read_clk32k(struct clocksource *cs)
{
return read_CRTR();
@ -115,23 +109,25 @@ static struct clocksource clk32k = {
static void
clkevt32k_mode(enum clock_event_mode mode, struct clock_event_device *dev)
{
unsigned int val;
/* Disable and flush pending timer interrupts */
at91_st_write(AT91_ST_IDR, AT91_ST_PITS | AT91_ST_ALMS);
at91_st_read(AT91_ST_SR);
regmap_write(regmap_st, AT91_ST_IDR, AT91_ST_PITS | AT91_ST_ALMS);
regmap_read(regmap_st, AT91_ST_SR, &val);
last_crtr = read_CRTR();
switch (mode) {
case CLOCK_EVT_MODE_PERIODIC:
/* PIT for periodic irqs; fixed rate of 1/HZ */
irqmask = AT91_ST_PITS;
at91_st_write(AT91_ST_PIMR, RM9200_TIMER_LATCH);
regmap_write(regmap_st, AT91_ST_PIMR, RM9200_TIMER_LATCH);
break;
case CLOCK_EVT_MODE_ONESHOT:
/* ALM for oneshot irqs, set by next_event()
* before 32 seconds have passed
*/
irqmask = AT91_ST_ALMS;
at91_st_write(AT91_ST_RTAR, last_crtr);
regmap_write(regmap_st, AT91_ST_RTAR, last_crtr);
break;
case CLOCK_EVT_MODE_SHUTDOWN:
case CLOCK_EVT_MODE_UNUSED:
@ -139,7 +135,7 @@ clkevt32k_mode(enum clock_event_mode mode, struct clock_event_device *dev)
irqmask = 0;
break;
}
at91_st_write(AT91_ST_IER, irqmask);
regmap_write(regmap_st, AT91_ST_IER, irqmask);
}
static int
@ -147,6 +143,7 @@ clkevt32k_next_event(unsigned long delta, struct clock_event_device *dev)
{
u32 alm;
int status = 0;
unsigned int val;
BUG_ON(delta < 2);
@ -162,12 +159,12 @@ clkevt32k_next_event(unsigned long delta, struct clock_event_device *dev)
alm = read_CRTR();
/* Cancel any pending alarm; flush any pending IRQ */
at91_st_write(AT91_ST_RTAR, alm);
at91_st_read(AT91_ST_SR);
regmap_write(regmap_st, AT91_ST_RTAR, alm);
regmap_read(regmap_st, AT91_ST_SR, &val);
/* Schedule alarm by writing RTAR. */
alm += delta;
at91_st_write(AT91_ST_RTAR, alm);
regmap_write(regmap_st, AT91_ST_RTAR, alm);
return status;
}
@ -180,66 +177,40 @@ static struct clock_event_device clkevt = {
.set_mode = clkevt32k_mode,
};
void __iomem *at91_st_base;
EXPORT_SYMBOL_GPL(at91_st_base);
static const struct of_device_id at91rm9200_st_timer_ids[] = {
{ .compatible = "atmel,at91rm9200-st" },
{ /* sentinel */ }
};
static int __init of_at91rm9200_st_init(void)
{
struct device_node *np;
int ret;
np = of_find_matching_node(NULL, at91rm9200_st_timer_ids);
if (!np)
goto err;
at91_st_base = of_iomap(np, 0);
if (!at91_st_base)
goto node_err;
/* Get the interrupts property */
ret = irq_of_parse_and_map(np, 0);
if (!ret)
goto ioremap_err;
at91rm9200_timer_irq.irq = ret;
of_node_put(np);
return 0;
ioremap_err:
iounmap(at91_st_base);
node_err:
of_node_put(np);
err:
return -EINVAL;
}
/*
* ST (system timer) module supports both clockevents and clocksource.
*/
void __init at91rm9200_timer_init(void)
static void __init atmel_st_timer_init(struct device_node *node)
{
/* For device tree enabled device: initialize here */
of_at91rm9200_st_init();
unsigned int val;
int irq, ret;
regmap_st = syscon_node_to_regmap(node);
if (IS_ERR(regmap_st))
panic(pr_fmt("Unable to get regmap\n"));
/* Disable all timer interrupts, and clear any pending ones */
at91_st_write(AT91_ST_IDR,
regmap_write(regmap_st, AT91_ST_IDR,
AT91_ST_PITS | AT91_ST_WDOVF | AT91_ST_RTTINC | AT91_ST_ALMS);
at91_st_read(AT91_ST_SR);
regmap_read(regmap_st, AT91_ST_SR, &val);
/* Get the interrupts property */
irq = irq_of_parse_and_map(node, 0);
if (!irq)
panic(pr_fmt("Unable to get IRQ from DT\n"));
/* Make IRQs happen for the system timer */
setup_irq(at91rm9200_timer_irq.irq, &at91rm9200_timer_irq);
ret = request_irq(irq, at91rm9200_timer_interrupt,
IRQF_SHARED | IRQF_TIMER | IRQF_IRQPOLL,
"at91_tick", regmap_st);
if (ret)
panic(pr_fmt("Unable to setup IRQ\n"));
/* The 32KiHz "Slow Clock" (tick every 30517.58 nanoseconds) is used
* directly for the clocksource and all clockevents, after adjusting
* its prescaler from the 1 Hz default.
*/
at91_st_write(AT91_ST_RTMR, 1);
regmap_write(regmap_st, AT91_ST_RTMR, 1);
/* Setup timer clockevent, with minimum of two ticks (important!!) */
clkevt.cpumask = cpumask_of(0);
@ -249,3 +220,5 @@ void __init at91rm9200_timer_init(void)
/* register clocksource */
clocksource_register_hz(&clk32k, AT91_SLOW_CLOCK);
}
CLOCKSOURCE_OF_DECLARE(atmel_st_timer, "atmel,at91rm9200-st",
atmel_st_timer_init);

2
drivers/watchdog/Kconfig
View File

@ -154,7 +154,7 @@ config ARM_SP805_WATCHDOG
config AT91RM9200_WATCHDOG
tristate "AT91RM9200 watchdog"
depends on SOC_AT91RM9200
depends on SOC_AT91RM9200 && MFD_SYSCON
help
Watchdog timer embedded into AT91RM9200 chips. This will reboot your
system when the timeout is reached.

61
drivers/watchdog/at91rm9200_wdt.c
View File

@ -12,27 +12,32 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/errno.h>
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/atmel-st.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/platform_device.h>
#include <linux/reboot.h>
#include <linux/regmap.h>
#include <linux/types.h>
#include <linux/watchdog.h>
#include <linux/uaccess.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <mach/at91_st.h>
#define WDT_DEFAULT_TIME 5 /* seconds */
#define WDT_MAX_TIME 256 /* seconds */
static int wdt_time = WDT_DEFAULT_TIME;
static bool nowayout = WATCHDOG_NOWAYOUT;
static struct regmap *regmap_st;
module_param(wdt_time, int, 0);
MODULE_PARM_DESC(wdt_time, "Watchdog time in seconds. (default="
@ -50,12 +55,33 @@ static unsigned long at91wdt_busy;
/* ......................................................................... */
static int at91rm9200_restart(struct notifier_block *this,
unsigned long mode, void *cmd)
{
/*
* Perform a hardware reset with the use of the Watchdog timer.
*/
regmap_write(regmap_st, AT91_ST_WDMR,
AT91_ST_RSTEN | AT91_ST_EXTEN | 1);
regmap_write(regmap_st, AT91_ST_CR, AT91_ST_WDRST);
mdelay(2000);
pr_emerg("Unable to restart system\n");
return NOTIFY_DONE;
}
static struct notifier_block at91rm9200_restart_nb = {
.notifier_call = at91rm9200_restart,
.priority = 192,
};
/*
* Disable the watchdog.
*/
static inline void at91_wdt_stop(void)
{
at91_st_write(AT91_ST_WDMR, AT91_ST_EXTEN);
regmap_write(regmap_st, AT91_ST_WDMR, AT91_ST_EXTEN);
}
/*
@ -63,9 +89,9 @@ static inline void at91_wdt_stop(void)
*/
static inline void at91_wdt_start(void)
{
at91_st_write(AT91_ST_WDMR, AT91_ST_EXTEN | AT91_ST_RSTEN |
regmap_write(regmap_st, AT91_ST_WDMR, AT91_ST_EXTEN | AT91_ST_RSTEN |
(((65536 * wdt_time) >> 8) & AT91_ST_WDV));
at91_st_write(AT91_ST_CR, AT91_ST_WDRST);
regmap_write(regmap_st, AT91_ST_CR, AT91_ST_WDRST);
}
/*
@ -73,7 +99,7 @@ static inline void at91_wdt_start(void)
*/
static inline void at91_wdt_reload(void)
{
at91_st_write(AT91_ST_CR, AT91_ST_WDRST);
regmap_write(regmap_st, AT91_ST_CR, AT91_ST_WDRST);
}
/* ......................................................................... */
@ -203,16 +229,32 @@ static struct miscdevice at91wdt_miscdev = {
static int at91wdt_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device *parent;
int res;
if (at91wdt_miscdev.parent)
return -EBUSY;
at91wdt_miscdev.parent = &pdev->dev;
parent = dev->parent;
if (!parent) {
dev_err(dev, "no parent\n");
return -ENODEV;
}
regmap_st = syscon_node_to_regmap(parent->of_node);
if (!regmap_st)
return -ENODEV;
res = misc_register(&at91wdt_miscdev);
if (res)
return res;
res = register_restart_handler(&at91rm9200_restart_nb);
if (res)
dev_warn(dev, "failed to register restart handler\n");
pr_info("AT91 Watchdog Timer enabled (%d seconds%s)\n",
wdt_time, nowayout ? ", nowayout" : "");
return 0;
@ -220,8 +262,13 @@ static int at91wdt_probe(struct platform_device *pdev)
static int at91wdt_remove(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
int res;
res = unregister_restart_handler(&at91rm9200_restart_nb);
if (res)
dev_warn(dev, "failed to unregister restart handler\n");
res = misc_deregister(&at91wdt_miscdev);
if (!res)
at91wdt_miscdev.parent = NULL;
@ -267,7 +314,7 @@ static struct platform_driver at91wdt_driver = {
.suspend = at91wdt_suspend,
.resume = at91wdt_resume,
.driver = {
.name = "at91_wdt",
.name = "atmel_st_watchdog",
.of_match_table = at91_wdt_dt_ids,
},
};
@ -296,4 +343,4 @@ module_exit(at91_wdt_exit);
MODULE_AUTHOR("Andrew Victor");
MODULE_DESCRIPTION("Watchdog driver for Atmel AT91RM9200");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:at91_wdt");
MODULE_ALIAS("platform:atmel_st_watchdog");

49
include/linux/mfd/syscon/atmel-st.h Normal file
View File

@ -0,0 +1,49 @@
/*
* Copyright (C) 2005 Ivan Kokshaysky
* Copyright (C) SAN People
*
* System Timer (ST) - System peripherals registers.
* Based on AT91RM9200 datasheet revision E.
*
* 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.
*/
#ifndef _LINUX_MFD_SYSCON_ATMEL_ST_H
#define _LINUX_MFD_SYSCON_ATMEL_ST_H
#include <linux/bitops.h>
#define AT91_ST_CR 0x00 /* Control Register */
#define AT91_ST_WDRST BIT(0) /* Watchdog Timer Restart */
#define AT91_ST_PIMR 0x04 /* Period Interval Mode Register */
#define AT91_ST_PIV 0xffff /* Period Interval Value */
#define AT91_ST_WDMR 0x08 /* Watchdog Mode Register */
#define AT91_ST_WDV 0xffff /* Watchdog Counter Value */
#define AT91_ST_RSTEN BIT(16) /* Reset Enable */
#define AT91_ST_EXTEN BIT(17) /* External Signal Assertion Enable */
#define AT91_ST_RTMR 0x0c /* Real-time Mode Register */
#define AT91_ST_RTPRES 0xffff /* Real-time Prescalar Value */
#define AT91_ST_SR 0x10 /* Status Register */
#define AT91_ST_PITS BIT(0) /* Period Interval Timer Status */
#define AT91_ST_WDOVF BIT(1) /* Watchdog Overflow */
#define AT91_ST_RTTINC BIT(2) /* Real-time Timer Increment */
#define AT91_ST_ALMS BIT(3) /* Alarm Status */
#define AT91_ST_IER 0x14 /* Interrupt Enable Register */
#define AT91_ST_IDR 0x18 /* Interrupt Disable Register */
#define AT91_ST_IMR 0x1c /* Interrupt Mask Register */
#define AT91_ST_RTAR 0x20 /* Real-time Alarm Register */
#define AT91_ST_ALMV 0xfffff /* Alarm Value */
#define AT91_ST_CRTR 0x24 /* Current Real-time Register */
#define AT91_ST_CRTV 0xfffff /* Current Real-Time Value */
#endif /* _LINUX_MFD_SYSCON_ATMEL_ST_H */