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mips: ip32: add platform data hooks to use DS1685 driver

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This modifies the IP32 (SGI O2) platform and reset code to utilize the new
rtc-ds1685 driver.  The old mc146818rtc.h header is removed and ip32_defconfig
is updated as well.

Signed-off-by: Joshua Kinard <kumba@gentoo.org>
Acked-by: Ralf Baechle <ralf@linux-mips.org>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joshua Kinard
2015-04-16 12:49:09 -07:00
committed by Linus Torvalds
parent 9e522c0d28
commit 15beb694c6
4 changed files with 84 additions and 140 deletions
Download Patch File Download Diff File Expand all files Collapse all files

139
arch/mips/sgi-ip32/ip32-reset.c
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@@ -11,10 +11,11 @@
#include <linux/compiler.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/notifier.h>
#include <linux/delay.h>
#include <linux/ds17287rtc.h>
#include <linux/rtc/ds1685.h>
#include <linux/interrupt.h>
#include <linux/pm.h>
@@ -33,53 +34,40 @@
#define POWERDOWN_FREQ (HZ / 4)
#define PANIC_FREQ (HZ / 8)
static struct timer_list power_timer, blink_timer, debounce_timer;
static int has_panicked, shuting_down;
extern struct platform_device ip32_rtc_device;
static void ip32_machine_restart(char *command) __noreturn;
static void ip32_machine_halt(void) __noreturn;
static void ip32_machine_power_off(void) __noreturn;
static struct timer_list power_timer, blink_timer;
static int has_panicked, shutting_down;
static __noreturn void ip32_poweroff(void *data)
{
void (*poweroff_func)(struct platform_device *) =
symbol_get(ds1685_rtc_poweroff);
#ifdef CONFIG_MODULES
/* If the first __symbol_get failed, our module wasn't loaded. */
if (!poweroff_func) {
request_module("rtc-ds1685");
poweroff_func = symbol_get(ds1685_rtc_poweroff);
}
#endif
if (!poweroff_func)
pr_emerg("RTC not available for power-off. Spinning forever ...\n");
else {
(*poweroff_func)((struct platform_device *)data);
symbol_put(ds1685_rtc_poweroff);
}
unreachable();
}
static void ip32_machine_restart(char *cmd) __noreturn;
static void ip32_machine_restart(char *cmd)
{
msleep(20);
crime->control = CRIME_CONTROL_HARD_RESET;
while (1);
}
static inline void ip32_machine_halt(void)
{
ip32_machine_power_off();
}
static void ip32_machine_power_off(void)
{
unsigned char reg_a, xctrl_a, xctrl_b;
disable_irq(MACEISA_RTC_IRQ);
reg_a = CMOS_READ(RTC_REG_A);
/* setup for kickstart & wake-up (DS12287 Ref. Man. p. 19) */
reg_a &= ~DS_REGA_DV2;
reg_a |= DS_REGA_DV1;
CMOS_WRITE(reg_a | DS_REGA_DV0, RTC_REG_A);
wbflush();
xctrl_b = CMOS_READ(DS_B1_XCTRL4B)
| DS_XCTRL4B_ABE | DS_XCTRL4B_KFE;
CMOS_WRITE(xctrl_b, DS_B1_XCTRL4B);
xctrl_a = CMOS_READ(DS_B1_XCTRL4A) & ~DS_XCTRL4A_IFS;
CMOS_WRITE(xctrl_a, DS_B1_XCTRL4A);
wbflush();
/* adios amigos... */
CMOS_WRITE(xctrl_a | DS_XCTRL4A_PAB, DS_B1_XCTRL4A);
CMOS_WRITE(reg_a, RTC_REG_A);
wbflush();
while (1);
}
static void power_timeout(unsigned long data)
{
ip32_machine_power_off();
unreachable();
}
static void blink_timeout(unsigned long data)
@@ -89,44 +77,27 @@ static void blink_timeout(unsigned long data)
mod_timer(&blink_timer, jiffies + data);
}
static void debounce(unsigned long data)
static void ip32_machine_halt(void)
{
unsigned char reg_a, reg_c, xctrl_a;
reg_c = CMOS_READ(RTC_INTR_FLAGS);
reg_a = CMOS_READ(RTC_REG_A);
CMOS_WRITE(reg_a | DS_REGA_DV0, RTC_REG_A);
wbflush();
xctrl_a = CMOS_READ(DS_B1_XCTRL4A);
if ((xctrl_a & DS_XCTRL4A_IFS) || (reg_c & RTC_IRQF )) {
/* Interrupt still being sent. */
debounce_timer.expires = jiffies + 50;
add_timer(&debounce_timer);
/* clear interrupt source */
CMOS_WRITE(xctrl_a & ~DS_XCTRL4A_IFS, DS_B1_XCTRL4A);
CMOS_WRITE(reg_a & ~DS_REGA_DV0, RTC_REG_A);
return;
}
CMOS_WRITE(reg_a & ~DS_REGA_DV0, RTC_REG_A);
if (has_panicked)
ip32_machine_restart(NULL);
enable_irq(MACEISA_RTC_IRQ);
ip32_poweroff(&ip32_rtc_device);
}
static inline void ip32_power_button(void)
static void power_timeout(unsigned long data)
{
ip32_poweroff(&ip32_rtc_device);
}
void ip32_prepare_poweroff(void)
{
if (has_panicked)
return;
if (shuting_down || kill_cad_pid(SIGINT, 1)) {
if (shutting_down || kill_cad_pid(SIGINT, 1)) {
/* No init process or button pressed twice. */
ip32_machine_power_off();
ip32_poweroff(&ip32_rtc_device);
}
shuting_down = 1;
shutting_down = 1;
blink_timer.data = POWERDOWN_FREQ;
blink_timeout(POWERDOWN_FREQ);
@@ -136,27 +107,6 @@ static inline void ip32_power_button(void)
add_timer(&power_timer);
}
static irqreturn_t ip32_rtc_int(int irq, void *dev_id)
{
unsigned char reg_c;
reg_c = CMOS_READ(RTC_INTR_FLAGS);
if (!(reg_c & RTC_IRQF)) {
printk(KERN_WARNING
"%s: RTC IRQ without RTC_IRQF\n", __func__);
}
/* Wait until interrupt goes away */
disable_irq_nosync(MACEISA_RTC_IRQ);
init_timer(&debounce_timer);
debounce_timer.function = debounce;
debounce_timer.expires = jiffies + 50;
add_timer(&debounce_timer);
printk(KERN_DEBUG "Power button pressed\n");
ip32_power_button();
return IRQ_HANDLED;
}
static int panic_event(struct notifier_block *this, unsigned long event,
void *ptr)
{
@@ -190,15 +140,12 @@ static __init int ip32_reboot_setup(void)
_machine_restart = ip32_machine_restart;
_machine_halt = ip32_machine_halt;
pm_power_off = ip32_machine_power_off;
pm_power_off = ip32_machine_halt;
init_timer(&blink_timer);
blink_timer.function = blink_timeout;
atomic_notifier_chain_register(&panic_notifier_list, &panic_block);
if (request_irq(MACEISA_RTC_IRQ, ip32_rtc_int, 0, "rtc", NULL))
panic("Can't allocate MACEISA RTC IRQ");
return 0;
}