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Diffstat (limited to 'recipes/linux/linux-gumstix-2.6.15/rmk-2022-2-rtctime-sa110-pxa255-driver.patch')
-rw-r--r--recipes/linux/linux-gumstix-2.6.15/rmk-2022-2-rtctime-sa110-pxa255-driver.patch329
1 files changed, 329 insertions, 0 deletions
diff --git a/recipes/linux/linux-gumstix-2.6.15/rmk-2022-2-rtctime-sa110-pxa255-driver.patch b/recipes/linux/linux-gumstix-2.6.15/rmk-2022-2-rtctime-sa110-pxa255-driver.patch
new file mode 100644
index 0000000000..87f4ebdc38
--- /dev/null
+++ b/recipes/linux/linux-gumstix-2.6.15/rmk-2022-2-rtctime-sa110-pxa255-driver.patch
@@ -0,0 +1,329 @@
+Index: linux-2.6.15gum/drivers/char/sa1100-rtc.c
+===================================================================
+--- /dev/null
++++ linux-2.6.15gum/drivers/char/sa1100-rtc.c
+@@ -0,0 +1,297 @@
++/*
++ * Real Time Clock interface for Linux on StrongARM SA1100
++ *
++ * Copyright (c) 2000 Nils Faerber
++ *
++ * Based on rtc.c by Paul Gortmaker
++ * Date/time conversion routines taken from arch/arm/kernel/time.c
++ * by Linus Torvalds and Russel King
++ * and the GNU C Library
++ * ( ... I love the GPL ... just take what you need! ;)
++ *
++ * 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.
++ *
++ * 1.00 2001-06-08 Nicolas Pitre <nico@cam.org>
++ * - added periodic timer capability using OSMR1
++ * - flag compatibility with other RTC chips
++ * - permission checks for ioctls
++ * - major cleanup, partial rewrite
++ *
++ * 0.03 2001-03-07 CIH <cih@coventive.com>
++ * - Modify the bug setups RTC clock.
++ *
++ * 0.02 2001-02-27 Nils Faerber <nils@@kernelconcepts.de>
++ * - removed mktime(), added alarm irq clear
++ *
++ * 0.01 2000-10-01 Nils Faerber <nils@@kernelconcepts.de>
++ * - initial release
++ */
++
++#include <linux/module.h>
++#include <linux/fs.h>
++#include <linux/miscdevice.h>
++#include <linux/string.h>
++#include <linux/init.h>
++#include <linux/poll.h>
++#include <linux/proc_fs.h>
++#include <linux/interrupt.h>
++#include <linux/rtc.h>
++
++#ifdef CONFIG_ARCH_PXA
++#include <asm/arch/pxa-regs.h>
++#endif
++
++#include <asm/bitops.h>
++#include <asm/hardware.h>
++#include <asm/irq.h>
++#include <asm/rtc.h>
++
++#define TIMER_FREQ 3686400
++
++#define RTC_DEF_DIVIDER 32768 - 1
++#define RTC_DEF_TRIM 0
++
++/* Those are the bits from a classic RTC we want to mimic */
++#define RTC_IRQF 0x80 /* any of the following 3 is active */
++#define RTC_PF 0x40
++#define RTC_AF 0x20
++#define RTC_UF 0x10
++
++static unsigned long rtc_freq = 1024;
++static struct rtc_time rtc_alarm = {
++ .tm_year = 0,
++ .tm_mon = 0,
++ .tm_mday = 0,
++ .tm_hour = 0,
++ .tm_mon = 0,
++ .tm_sec = 0,
++};
++
++extern spinlock_t rtc_lock;
++
++static int rtc_update_alarm(struct rtc_time *alrm)
++{
++ struct rtc_time alarm_tm, now_tm;
++ unsigned long now, time;
++ int ret;
++
++ printk("Updating alarm\n");
++ do {
++ now = RCNR;
++ rtc_time_to_tm(now, &now_tm);
++ rtc_next_alarm_time(&alarm_tm, &now_tm, alrm);
++ ret = rtc_tm_to_time(&alarm_tm, &time);
++ if (ret != 0)
++ break;
++
++ RTSR = RTSR & (RTSR_HZE|RTSR_ALE|RTSR_AL);
++ RTAR = time;
++ } while (now != RCNR);
++ printk("set RTAR to %lx, now is %lx\n", time, now);
++
++ return ret;
++}
++
++static irqreturn_t rtc_interrupt(int irq, void *dev_id, struct pt_regs *regs)
++{
++ unsigned int rtsr;
++ unsigned long events = 0;
++
++ spin_lock(&rtc_lock);
++
++ rtsr = RTSR;
++ /* clear interrupt sources */
++ RTSR = 0;
++ RTSR = (RTSR_AL|RTSR_HZ) & (rtsr >> 2);
++
++ printk(KERN_CRIT "rtc_interrupt: rtsr = %x\n", rtsr);
++
++ /* clear alarm interrupt if it has occurred */
++ if (rtsr & RTSR_AL) {
++ printk(KERN_CRIT "ALARM INTRRUPT\n");
++ rtsr &= ~RTSR_ALE;
++ }
++ RTSR = rtsr & (RTSR_ALE|RTSR_HZE);
++
++ /* update irq data & counter */
++ if (rtsr & RTSR_AL)
++ events |= (RTC_AF|RTC_IRQF);
++ if (rtsr & RTSR_HZ)
++ events |= (RTC_UF|RTC_IRQF);
++
++ rtc_update(1, events);
++
++ if (rtsr & RTSR_AL && rtc_periodic_alarm(&rtc_alarm))
++ rtc_update_alarm(&rtc_alarm);
++
++ spin_unlock(&rtc_lock);
++
++ return IRQ_HANDLED;
++}
++
++
++static int sa1100_rtc_open(void)
++{
++ int ret;
++
++ ret = request_irq(IRQ_RTC1Hz, rtc_interrupt, SA_INTERRUPT, "rtc 1Hz", NULL);
++ if (ret) {
++ printk(KERN_ERR "rtc: IRQ%d already in use.\n", IRQ_RTC1Hz);
++ goto fail_ui;
++ }
++ ret = request_irq(IRQ_RTCAlrm, rtc_interrupt, SA_INTERRUPT, "rtc Alrm", NULL);
++ if (ret) {
++ printk(KERN_ERR "rtc: IRQ%d already in use.\n", IRQ_RTCAlrm);
++ goto fail_ai;
++ }
++ return 0;
++
++ fail_ai:
++ free_irq(IRQ_RTC1Hz, NULL);
++ fail_ui:
++ return ret;
++}
++
++static void sa1100_rtc_release(void)
++{
++ spin_lock_irq (&rtc_lock);
++ RTSR = 0;
++ OIER &= ~OIER_E1;
++ OSSR = OSSR_M1;
++ spin_unlock_irq (&rtc_lock);
++
++ free_irq(IRQ_RTCAlrm, NULL);
++ free_irq(IRQ_RTC1Hz, NULL);
++}
++
++static int sa1100_rtc_ioctl(unsigned int cmd, unsigned long arg)
++{
++ switch (cmd) {
++ case RTC_AIE_OFF:
++ spin_lock_irq(&rtc_lock);
++ RTSR &= ~RTSR_ALE;
++ spin_unlock_irq(&rtc_lock);
++ return 0;
++ case RTC_AIE_ON:
++ spin_lock_irq(&rtc_lock);
++ RTSR |= RTSR_ALE;
++ spin_unlock_irq(&rtc_lock);
++ return 0;
++ case RTC_UIE_OFF:
++ spin_lock_irq(&rtc_lock);
++ RTSR &= ~RTSR_HZE;
++ spin_unlock_irq(&rtc_lock);
++ return 0;
++ case RTC_UIE_ON:
++ spin_lock_irq(&rtc_lock);
++ RTSR |= RTSR_HZE;
++ spin_unlock_irq(&rtc_lock);
++ return 0;
++ }
++ return -EINVAL;
++}
++
++static void sa1100_rtc_read_time(struct rtc_time *tm)
++{
++ rtc_time_to_tm(RCNR, tm);
++}
++
++static int sa1100_rtc_set_time(struct rtc_time *tm)
++{
++ unsigned long time;
++ int ret;
++
++ ret = rtc_tm_to_time(tm, &time);
++ if (ret == 0)
++ RCNR = time;
++ return ret;
++}
++
++static void sa1100_rtc_read_alarm(struct rtc_wkalrm *alrm)
++{
++ memcpy(&alrm->time, &rtc_alarm, sizeof(struct rtc_time));
++ alrm->pending = RTSR & RTSR_AL ? 1 : 0;
++}
++
++static int sa1100_rtc_set_alarm(struct rtc_wkalrm *alrm)
++{
++ int ret;
++
++ printk("sa1100_rtc_set_alarm\n");
++
++ spin_lock_irq(&rtc_lock);
++ ret = rtc_update_alarm(&alrm->time);
++ if (ret == 0) {
++ memcpy(&rtc_alarm, &alrm->time, sizeof(struct rtc_time));
++
++ if (alrm->enabled)
++ enable_irq_wake(IRQ_RTCAlrm);
++ else
++ disable_irq_wake(IRQ_RTCAlrm);
++ }
++ spin_unlock_irq(&rtc_lock);
++
++ return ret;
++}
++
++static int sa1100_rtc_proc(char *buf)
++{
++ char *p = buf;
++
++ p += sprintf(p, "trim/divider\t: 0x%08x\n", RTTR);
++ p += sprintf(p, "alarm_IRQ\t: %s\n", (RTSR & RTSR_ALE) ? "yes" : "no" );
++ p += sprintf(p, "update_IRQ\t: %s\n", (RTSR & RTSR_HZE) ? "yes" : "no");
++ p += sprintf(p, "periodic_IRQ\t: %s\n", (OIER & OIER_E1) ? "yes" : "no");
++ p += sprintf(p, "periodic_freq\t: %ld\n", rtc_freq);
++
++ return p - buf;
++}
++
++static struct rtc_ops sa1100_rtc_ops = {
++ .owner = THIS_MODULE,
++ .open = sa1100_rtc_open,
++ .release = sa1100_rtc_release,
++ .ioctl = sa1100_rtc_ioctl,
++
++ .read_time = sa1100_rtc_read_time,
++ .set_time = sa1100_rtc_set_time,
++ .read_alarm = sa1100_rtc_read_alarm,
++ .set_alarm = sa1100_rtc_set_alarm,
++ .proc = sa1100_rtc_proc,
++};
++
++static int __init rtc_init(void)
++{
++ /*
++ * According to the manual we should be able to let RTTR be zero
++ * and then a default diviser for a 32.768KHz clock is used.
++ * Apparently this doesn't work, at least for my SA1110 rev 5.
++ * If the clock divider is uninitialized then reset it to the
++ * default value to get the 1Hz clock.
++ */
++ if (RTTR == 0) {
++ RTTR = RTC_DEF_DIVIDER + (RTC_DEF_TRIM << 16);
++ printk(KERN_WARNING "rtc: warning: initializing default clock divider/trim value\n");
++ /* The current RTC value probably doesn't make sense either */
++ RCNR = 0;
++ }
++
++ register_rtc(&sa1100_rtc_ops);
++
++ return 0;
++}
++
++static void __exit rtc_exit(void)
++{
++ unregister_rtc(&sa1100_rtc_ops);
++}
++
++module_init(rtc_init);
++module_exit(rtc_exit);
++
++MODULE_AUTHOR("Nils Faerber <nils@@kernelconcepts.de>");
++MODULE_DESCRIPTION("SA1100 Realtime Clock Driver (RTC)");
++MODULE_LICENSE("GPL"); /* so says the header */
+Index: linux-2.6.15gum/drivers/char/Makefile
+===================================================================
+--- linux-2.6.15gum.orig/drivers/char/Makefile
++++ linux-2.6.15gum/drivers/char/Makefile
+@@ -60,6 +60,7 @@ obj-$(CONFIG_RTC) += rtc.o
+ obj-$(CONFIG_HPET) += hpet.o
+ obj-$(CONFIG_GEN_RTC) += genrtc.o
+ obj-$(CONFIG_EFI_RTC) += efirtc.o
++obj-$(CONFIG_SA1100_RTC) += sa1100-rtc.o
+ obj-$(CONFIG_SGI_DS1286) += ds1286.o
+ obj-$(CONFIG_SGI_IP27_RTC) += ip27-rtc.o
+ obj-$(CONFIG_DS1302) += ds1302.o
+Index: linux-2.6.15gum/drivers/char/Kconfig
+===================================================================
+--- linux-2.6.15gum.orig/drivers/char/Kconfig
++++ linux-2.6.15gum/drivers/char/Kconfig
+@@ -790,6 +790,10 @@ config COBALT_LCD
+ This option enables support for the LCD display and buttons found
+ on Cobalt systems through a misc device.
+
++config SA1100_RTC
++ tristate "SA1100/PXA2xx Real Time Clock"
++ depends on ARCH_SA1100 || ARCH_PXA
++
+ config DTLK
+ tristate "Double Talk PC internal speech card support"
+ help
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