[PATCH 2/2]: MIPS: sgi-ip32: Add support for rtc-ds1685 to SGI O2(IP32)

From: Joshua Kinard
Date: Thu Apr 07 2011 - 09:21:33 EST

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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).

Signed-off-by: Joshua Kinard <kumba@xxxxxxxxxx>
- ---

include/asm/mach-ip32/mc146818rtc.h | 36 ----------
sgi-ip32/ip32-platform.c | 49 ++++++++++++--
sgi-ip32/ip32-reset.c | 118 ++++++++----------------------------
3 files changed, 67 insertions(+), 136 deletions(-)

diff -Naurp mipslinux.orig/arch/mips/include/asm/mach-ip32/mc146818rtc.h
mipslinux.ip32-rtc/arch/mips/include/asm/mach-ip32/mc146818rtc.h
- --- mipslinux.orig/arch/mips/include/asm/mach-ip32/mc146818rtc.h 2009-04-28
20:29:27.000000000 -0400
+++ mipslinux.ip32-rtc/arch/mips/include/asm/mach-ip32/mc146818rtc.h 1969-12-31
19:00:00.000000000 -0500
@@ -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 noone 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 mipslinux.orig/arch/mips/sgi-ip32/ip32-platform.c
mipslinux.ip32-rtc/arch/mips/sgi-ip32/ip32-platform.c
- --- mipslinux.orig/arch/mips/sgi-ip32/ip32-platform.c 2009-04-28
20:29:28.000000000 -0400
+++ mipslinux.ip32-rtc/arch/mips/sgi-ip32/ip32-platform.c 2011-04-07
08:02:00.063871001 -0400
@@ -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 inline 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 +93,50 @@ 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,
+};
+EXPORT_SYMBOL(ip32_rtc_device);
+
+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@xxxxxxxxxxxxxx>");
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 mipslinux.orig/arch/mips/sgi-ip32/ip32-reset.c
mipslinux.ip32-rtc/arch/mips/sgi-ip32/ip32-reset.c
- --- mipslinux.orig/arch/mips/sgi-ip32/ip32-reset.c 2009-05-23 12:01:03.025842703
- -0400
+++ mipslinux.ip32-rtc/arch/mips/sgi-ip32/ip32-reset.c 2011-04-07
08:02:00.063871001 -0400
@@ -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>

@@ -33,55 +33,31 @@
#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 ds1685_rtc_platform_data ip32_rtc_platform_data[];
+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 void ip32_poweroff(void *data)
{
- - crime->control = CRIME_CONTROL_HARD_RESET;
+#if defined(CONFIG_RTC_DRV_DS1685_FAMILY) && \
+ (defined(CONFIG_RTC_DRV_DS1685) || defined(CONFIG_RTC_DRV_DS17285))
+ ds1685_rtc_poweroff((struct platform_device *)data);
+#else
while (1);
+#endif
}

- -static inline void ip32_machine_halt(void)
- -{
- - ip32_machine_power_off();
- -}

- -static void ip32_machine_power_off(void)
+static void ip32_machine_restart(char *cmd) __attribute__((noreturn));
+static void ip32_machine_restart(char *cmd)
{
- - 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();
+ msleep(10);
+ crime->control = CRIME_CONTROL_HARD_RESET;
while (1);
}

- -static void power_timeout(unsigned long data)
- -{
- - ip32_machine_power_off();
- -}
- -
static void blink_timeout(unsigned long data)
{
unsigned long led = mace->perif.ctrl.misc ^ MACEISA_LED_RED;
@@ -89,44 +65,27 @@ 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);

@@ -135,27 +94,7 @@ static inline void ip32_power_button(voi
power_timer.expires = jiffies + POWERDOWN_TIMEOUT * HZ;
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;
- -}
+EXPORT_SYMBOL(ip32_prepare_poweroff);

static int panic_event(struct notifier_block *this, unsigned long event,
void *ptr)
@@ -190,15 +129,12 @@ 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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