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Message-ID: <4DA14B24.3070207@gentoo.org>
Date: Sun, 10 Apr 2011 02:16:04 -0400
From: Joshua Kinard <kumba@...too.org>
To: Linux MIPS List <linux-mips@...ux-mips.org>,
Ralf Baechle <ralf@...ux-mips.org>
CC: rtc-linux@...glegroups.com, LKML <linux-kernel@...r.kernel.org>,
Alessandro Zummo <a.zummo@...ertech.it>
Subject: Re: [PATCH 2/2]: MIPS: sgi-ip32: Add support for rtc-ds1685 to SGI
O2 (IP32)
On 04/07/2011 09:17, Joshua Kinard wrote:
>
> These are the modifications needed to the SGI O2 (IP32) codebase to switch off
> of rtc-cmos to rtc-ds1685. It needs to be applied after the main rtc-ds1685 patch.
>
> Key changes here eliminate the custom power-off code and call upon the version
> built into the main driver via platform_data, as well as defining the required
> register step-size of 256 bytes (0x100).
Updated patch, factoring in Ralf's comments and re-working the ip32_poweroff()
function to properly handle accessing the RTC's power-off function regardless if
it's a module or not.
Signed-off-by: Joshua Kinard <kumba@...too.org>
---
include/asm/mach-ip32/mc146818rtc.h | 36 ----------
sgi-ip32/ip32-platform.c | 48 ++++++++++---
sgi-ip32/ip32-reset.c | 128 ++++++++++--------------------------
3 files changed, 77 insertions(+), 135 deletions(-)
diff -Naurp a/arch/mips/include/asm/mach-ip32/mc146818rtc.h
b/arch/mips/include/asm/mach-ip32/mc146818rtc.h
--- a/arch/mips/include/asm/mach-ip32/mc146818rtc.h
+++ b/arch/mips/include/asm/mach-ip32/mc146818rtc.h
@@ -1,36 +0,0 @@
-/*
- * This file is subject to the terms and conditions of the GNU General Public
- * License. See the file "COPYING" in the main directory of this archive
- * for more details.
- *
- * Copyright (C) 1998, 2001, 03 by Ralf Baechle
- * Copyright (C) 2000 Harald Koerfgen
- *
- * RTC routines for IP32 style attached Dallas chip.
- */
-#ifndef __ASM_MACH_IP32_MC146818RTC_H
-#define __ASM_MACH_IP32_MC146818RTC_H
-
-#include <asm/ip32/mace.h>
-
-#define RTC_PORT(x) (0x70 + (x))
-
-static unsigned char CMOS_READ(unsigned long addr)
-{
- return mace->isa.rtc[addr << 8];
-}
-
-static inline void CMOS_WRITE(unsigned char data, unsigned long addr)
-{
- mace->isa.rtc[addr << 8] = data;
-}
-
-/*
- * FIXME: Do it right. For now just assume that no one lives in 20th century
- * and no O2 user in 22th century ;-)
- */
-#define mc146818_decode_year(year) ((year) + 2000)
-
-#define RTC_ALWAYS_BCD 0
-
-#endif /* __ASM_MACH_IP32_MC146818RTC_H */
diff -Naurp a/arch/mips/sgi-ip32/ip32-platform.c
b/arch/mips/sgi-ip32/ip32-platform.c
--- a/arch/mips/sgi-ip32/ip32-platform.c
+++ b/arch/mips/sgi-ip32/ip32-platform.c
@@ -9,10 +9,13 @@
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/serial_8250.h>
+#include <linux/rtc/ds1685.h>
#include <asm/ip32/mace.h>
#include <asm/ip32/ip32_ints.h>
+extern void ip32_prepare_poweroff(void);
+
#define MACEISA_SERIAL1_OFFS offsetof(struct sgi_mace, isa.serial1)
#define MACEISA_SERIAL2_OFFS offsetof(struct sgi_mace, isa.serial2)
@@ -90,22 +93,49 @@ static __init int sgio2btns_devinit(void
device_initcall(sgio2btns_devinit);
-static struct resource sgio2_cmos_rsrc[] = {
+#define MACE_RTC_RES_START (MACE_BASE + offsetof(struct sgi_mace, isa.rtc))
+#define MACE_RTC_RES_END (MACE_RTC_RES_START + 32767)
+
+static struct resource ip32_rtc_resources[] = {
{
- .start = 0x70,
- .end = 0x71,
- .flags = IORESOURCE_IO
+ .start = MACEISA_RTC_IRQ,
+ .end = MACEISA_RTC_IRQ,
+ .flags = IORESOURCE_IRQ
+ }, {
+ .start = MACE_RTC_RES_START,
+ .end = MACE_RTC_RES_END,
+ .flags = IORESOURCE_MEM,
}
};
-static __init int sgio2_cmos_devinit(void)
+
+/* RTC registers on IP32 are each padded by 256 bytes (0x100). */
+static struct ds1685_rtc_platform_data
+ip32_rtc_platform_data[] = {
+ {
+ .regstep = 0x100,
+ .plat_prepare_poweroff = ip32_prepare_poweroff,
+ },
+};
+
+struct platform_device ip32_rtc_device = {
+ .name = "rtc-ds1685",
+ .id = -1,
+ .dev = {
+ .platform_data = ip32_rtc_platform_data,
+ },
+ .num_resources = ARRAY_SIZE(ip32_rtc_resources),
+ .resource = ip32_rtc_resources,
+};
+
+static int __init sgio2_rtc_devinit(void)
{
- return IS_ERR(platform_device_register_simple("rtc_cmos", -1,
- sgio2_cmos_rsrc, 1));
+ return platform_device_register(&ip32_rtc_device);
+
}
-device_initcall(sgio2_cmos_devinit);
+device_initcall(sgio2_rtc_devinit);
MODULE_AUTHOR("Ralf Baechle <ralf@...ux-mips.org>");
MODULE_LICENSE("GPL");
-MODULE_DESCRIPTION("8250 UART probe driver for SGI IP32 aka O2");
+MODULE_DESCRIPTION("IP32 platform setup for SGI IP32 aka O2");
diff -Naurp a/arch/mips/sgi-ip32/ip32-reset.c b/arch/mips/sgi-ip32/ip32-reset.c
--- a/arch/mips/sgi-ip32/ip32-reset.c
+++ b/arch/mips/sgi-ip32/ip32-reset.c
@@ -13,7 +13,7 @@
#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 +33,42 @@
#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) __attribute__((noreturn));
-static void ip32_machine_halt(void) __attribute__((noreturn));
-static void ip32_machine_power_off(void) __attribute__((noreturn));
+static struct timer_list power_timer, blink_timer;
+static int has_panicked, shutting_down;
-static void ip32_machine_restart(char *cmd)
+static ATTRIB_NORET void ip32_poweroff(void *data)
{
- crime->control = CRIME_CONTROL_HARD_RESET;
- while (1);
-}
+ const char *poweroff_func_name = "ds1685_rtc_poweroff\0";
+ void (*poweroff_func)(void *) = __symbol_get(poweroff_func_name);
-static inline void ip32_machine_halt(void)
-{
- ip32_machine_power_off();
-}
+#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(poweroff_func_name);
+ }
+#endif
-static void ip32_machine_power_off(void)
-{
- unsigned char reg_a, xctrl_a, xctrl_b;
+ if (!poweroff_func)
+ printk(KERN_EMERG "RTC not available for power-off. "
+ "Spinning forever ...\n");
+ else {
+ (*poweroff_func)((struct platform_device *)data);
+ __symbol_put(poweroff_func_name);
+ }
- 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)
+
+static void ip32_machine_restart(char *cmd) __attribute__((noreturn));
+static void ip32_machine_restart(char *cmd)
{
- ip32_machine_power_off();
+ msleep(10);
+ crime->control = CRIME_CONTROL_HARD_RESET;
+ while (1);
}
static void blink_timeout(unsigned long data)
@@ -89,44 +78,27 @@ static void blink_timeout(unsigned long
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);
+ ip32_poweroff(&ip32_rtc_device);
+}
- enable_irq(MACEISA_RTC_IRQ);
+static void power_timeout(unsigned long data)
+{
+ ip32_poweroff(&ip32_rtc_device);
}
-static inline void ip32_power_button(void)
+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 +108,6 @@ static inline void ip32_power_button(voi
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 +141,12 @@ 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;
}
--
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