Generic RTC driver in 2.4.x (fwd)
Geert Uytterhoeven
geert at linux-m68k.org
Sun Jan 12 22:29:10 EST 2003
FYI...
---------- Forwarded message ----------
Date: Sat, 11 Jan 2003 20:50:46 +0100
From: Helge Deller <deller at gmx.de>
To: Geert Uytterhoeven <geert at linux-m68k.org>,
Alan Cox <alan at lxorguk.ukuu.org.uk>, parisc-linux at parisc-linux.org
Cc: Linux/m68k <linux-m68k at lists.linux-m68k.org>
Subject: Re: Generic RTC driver in 2.4.x
On Friday 10 January 2003 21:05, Geert Uytterhoeven wrote:
> Unfortunately I didn't receive any feedback from the pa-risc and ppc people
> after my previous posting last Sunday.
Hi Geert,
It took me some time, but here are the PA-RISC specific patches vs. your
latest genrtc driver.
Please consider applying,
Helge
ChangeLog:
- small indenting fixes,
- new driver version number
- more "static" functions
- C99 named initializers
- added RTC_BATT_BAD capatibility flag (for the procfs-interface),
- get_rtc_time() now returns the "capatibilities" value (e.g. RTC_BATT_BAD | RTC_24H)
[this means, the m86k get_rtc_time() function has to return a value too.
-------------- next part --------------
--- ./drivers/char/genrtc.c.geert Sat Jan 11 18:14:50 2003
+++ ./drivers/char/genrtc.c Sat Jan 11 20:36:28 2003
@@ -1,5 +1,8 @@
/*
- * Real Time Clock interface for q40 and other m68k machines
+ * Real Time Clock interface for
+ * - q40 and other m68k machines,
+ * - HP PARISC machines
+ * - PowerPC machines
* emulate some RTC irq capabilities in software
*
* Copyright (C) 1999 Richard Zidlicky
@@ -13,7 +16,7 @@
* pseudo-file for status information.
*
* The ioctls can be used to set the interrupt behaviour where
- * supported.
+ * supported.
*
* The /dev/rtc interface will block on reads until an interrupt
* has been received. If a RTC interrupt has already happened,
@@ -34,9 +37,10 @@
* 1.04 removed useless timer code rz at linux-m68k.org
* 1.05 portable RTC_UIE emulation rz at linux-m68k.org
* 1.06 set_rtc_time can return an error trini at kernel.crashing.org
+ * 1.07 ported to HP PARISC (hppa) Helge Deller <deller at gmx.de>
*/
-#define RTC_VERSION "1.06"
+#define RTC_VERSION "1.07"
#include <linux/module.h>
#include <linux/config.h>
@@ -71,11 +75,11 @@
#define RTC_IS_OPEN 0x01 /* means /dev/rtc is in use */
-unsigned char gen_rtc_status; /* bitmapped status byte. */
-unsigned long gen_rtc_irq_data; /* our output to the world */
+static unsigned char gen_rtc_status; /* bitmapped status byte. */
+static unsigned long gen_rtc_irq_data; /* our output to the world */
/* months start at 0 now */
-unsigned char days_in_mo[] =
+static unsigned char days_in_mo[] =
{31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
static int irq_active;
@@ -88,7 +92,7 @@
static int lostint;
static int tt_exp;
-void gen_rtc_timer(unsigned long data);
+static void gen_rtc_timer(unsigned long data);
static volatile int stask_active; /* schedule_task */
static volatile int ttask_active; /* timer_task */
@@ -99,7 +103,7 @@
* Routine to poll RTC seconds field for change as often as posible,
* after first RTC_UIE use timer to reduce polling
*/
-void genrtc_troutine(void *data)
+static void genrtc_troutine(void *data)
{
unsigned int tmp = get_rtc_ss();
@@ -123,7 +127,7 @@
stask_active = 0;
}
-void gen_rtc_timer(unsigned long data)
+static void gen_rtc_timer(unsigned long data)
{
lostint = get_rtc_ss() - oldsecs ;
if (lostint<0)
@@ -144,7 +148,7 @@
* from some routine that periodically (eg 100HZ) monitors
* whether RTC_SECS changed
*/
-void gen_rtc_interrupt(unsigned long arg)
+static void gen_rtc_interrupt(unsigned long arg)
{
/* We store the status in the low byte and the number of
* interrupts received since the last read in the remainder
@@ -384,24 +388,24 @@
*/
static struct file_operations gen_rtc_fops = {
- owner: THIS_MODULE,
+ .owner = THIS_MODULE,
#ifdef CONFIG_GEN_RTC_X
- read: gen_rtc_read,
- poll: gen_rtc_poll,
+ .read = gen_rtc_read,
+ .poll = gen_rtc_poll,
#endif
- ioctl: gen_rtc_ioctl,
- open: gen_rtc_open,
- release: gen_rtc_release
+ .ioctl = gen_rtc_ioctl,
+ .open = gen_rtc_open,
+ .release = gen_rtc_release,
};
static struct miscdevice rtc_gen_dev =
{
- RTC_MINOR,
- "rtc",
- &gen_rtc_fops
+ .minor = RTC_MINOR,
+ .name = "rtc",
+ .fops = &gen_rtc_fops,
};
-int __init rtc_generic_init(void)
+static int __init rtc_generic_init(void)
{
int retval;
@@ -436,16 +440,18 @@
* Info exported via "/proc/rtc".
*/
-int gen_rtc_proc_output(char *buf)
+#ifdef CONFIG_PROC_FS
+
+static int gen_rtc_proc_output(char *buf)
{
char *p;
struct rtc_time tm;
- unsigned tmp;
+ unsigned flags;
struct rtc_pll_info pll;
p = buf;
- get_rtc_time(&tm);
+ flags = get_rtc_time(&tm);
p += sprintf(p,
"rtc_time\t: %02d:%02d:%02d\n"
@@ -454,7 +460,7 @@
tm.tm_hour, tm.tm_min, tm.tm_sec,
tm.tm_year + 1900, tm.tm_mon + 1, tm.tm_mday, 1900);
- tm.tm_hour=0;tm.tm_min=0;tm.tm_sec=0;
+ tm.tm_hour = tm.tm_min = tm.tm_sec = 0;
p += sprintf(p, "alarm\t\t: ");
if (tm.tm_hour <= 24)
@@ -472,7 +478,6 @@
else
p += sprintf(p, "**\n");
- tmp= RTC_24H ;
p += sprintf(p,
"DST_enable\t: %s\n"
"BCD\t\t: %s\n"
@@ -483,15 +488,15 @@
"periodic_IRQ\t: %s\n"
"periodic_freq\t: %ld\n"
"batt_status\t: %s\n",
- (tmp & RTC_DST_EN) ? "yes" : "no",
- (tmp & RTC_DM_BINARY) ? "no" : "yes",
- (tmp & RTC_24H) ? "yes" : "no",
- (tmp & RTC_SQWE) ? "yes" : "no",
- (tmp & RTC_AIE) ? "yes" : "no",
+ (flags & RTC_DST_EN) ? "yes" : "no",
+ (flags & RTC_DM_BINARY) ? "no" : "yes",
+ (flags & RTC_24H) ? "yes" : "no",
+ (flags & RTC_SQWE) ? "yes" : "no",
+ (flags & RTC_AIE) ? "yes" : "no",
irq_active ? "yes" : "no",
- (tmp & RTC_PIE) ? "yes" : "no",
+ (flags & RTC_PIE) ? "yes" : "no",
0L /* freq */,
- "okay" );
+ (flags & RTC_BATT_BAD) ? "bad" : "okay");
if (!get_rtc_pll(&pll))
p += sprintf(p,
"PLL adjustment\t: %d\n"
@@ -506,7 +511,7 @@
pll.pll_posmult,
pll.pll_negmult,
pll.pll_clock);
- return p - buf;
+ return p - buf;
}
static int gen_rtc_read_proc(char *page, char **start, off_t off,
@@ -521,6 +526,8 @@
return len;
}
+#endif /* CONFIG_PROC_FS */
+
MODULE_AUTHOR("Richard Zidlicky");
MODULE_LICENSE("GPL");
--- ./include/asm-parisc/rtc.h.geert Sat Jan 11 18:21:25 2003
+++ ./include/asm-parisc/rtc.h Sat Jan 11 20:40:41 2003
@@ -0,0 +1,131 @@
+/* include/asm-parisc/rtc.h */
+
+#ifndef _ASM_RTC_H
+#define _ASM_RTC_H
+
+#ifdef __KERNEL__
+
+#include <linux/rtc.h>
+#include <asm/errno.h>
+
+#define RTC_PIE 0x40 /* periodic interrupt enable */
+#define RTC_AIE 0x20 /* alarm interrupt enable */
+#define RTC_UIE 0x10 /* update-finished interrupt enable */
+
+/* some dummy definitions */
+#define RTC_BATT_BAD 0x10 /* battery bad */
+#define RTC_SQWE 0x08 /* enable square-wave output */
+#define RTC_DM_BINARY 0x04 /* all time/date values are BCD if clear */
+#define RTC_24H 0x02 /* 24 hour mode - else hours bit 7 means pm */
+#define RTC_DST_EN 0x01 /* auto switch DST - works f. USA only */
+
+
+/* constants for calculation */
+#define SECS_PER_HOUR (60 * 60)
+#define SECS_PER_DAY (SECS_PER_HOUR * 24)
+
+#define __isleap(year) \
+ ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))
+
+
+/* How many days come before each month (0-12). */
+static const unsigned short int __mon_yday[2][13] =
+{
+ /* Normal years. */
+ { 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334, 365 },
+ /* Leap years. */
+ { 0, 31, 60, 91, 121, 152, 182, 213, 244, 274, 305, 335, 366 }
+};
+
+static inline unsigned get_rtc_time(struct rtc_time *wtime)
+{
+ /*
+ * Only the values that we read from the RTC are set. We leave
+ * tm_wday, tm_yday and tm_isdst untouched. Even though the
+ * RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
+ * by the RTC when initially set to a non-zero value.
+ */
+
+ struct pdc_tod tod_data;
+ long int days, rem, y;
+ const unsigned short int *ip;
+
+ if (pdc_tod_read(&tod_data) < 0)
+ return (RTC_24H | RTC_BATT_BAD);
+
+
+ // most of the remainder of this function is:
+ // Copyright (C) 1991, 1993, 1997, 1998 Free Software Foundation, Inc.
+ // This was originally a part of the GNU C Library.
+ // It is distributed under the GPL, and was swiped from offtime.c
+
+
+ days = tod_data.tod_sec / SECS_PER_DAY;
+ rem = tod_data.tod_sec % SECS_PER_DAY;
+
+ wtime->tm_hour = rem / SECS_PER_HOUR;
+ rem %= SECS_PER_HOUR;
+ wtime->tm_min = rem / 60;
+ wtime->tm_sec = rem % 60;
+
+ y = 1970;
+
+#define DIV(a, b) ((a) / (b) - ((a) % (b) < 0))
+#define LEAPS_THRU_END_OF(y) (DIV (y, 4) - DIV (y, 100) + DIV (y, 400))
+
+ while (days < 0 || days >= (__isleap (y) ? 366 : 365))
+ {
+ /* Guess a corrected year, assuming 365 days per year. */
+ long int yg = y + days / 365 - (days % 365 < 0);
+
+ /* Adjust DAYS and Y to match the guessed year. */
+ days -= ((yg - y) * 365
+ + LEAPS_THRU_END_OF (yg - 1)
+ - LEAPS_THRU_END_OF (y - 1));
+ y = yg;
+ }
+ wtime->tm_year = y - 1900;
+#undef DIV
+#undef LEAPS_THRU_END_OF
+
+ ip = __mon_yday[__isleap(y)];
+ for (y = 11; days < (long int) ip[y]; --y)
+ continue;
+ days -= ip[y];
+ wtime->tm_mon = y;
+ wtime->tm_mday = days + 1;
+
+ return (RTC_24H);
+}
+
+static inline int set_rtc_time(struct rtc_time *wtime)
+{
+ u_int32_t secs;
+
+ secs = mktime(wtime->tm_year + 1900, wtime->tm_mon + 1, wtime->tm_mday,
+ wtime->tm_hour, wtime->tm_min, wtime->tm_sec);
+
+ if (pdc_tod_set(secs, 0) < 0)
+ return -EINVAL;
+ else
+ return 0;
+}
+
+static inline unsigned int get_rtc_ss(void)
+{
+ return -EINVAL;
+}
+
+static inline int get_rtc_pll(struct rtc_pll_info *pll)
+{
+ return -EINVAL;
+}
+static inline int set_rtc_pll(struct rtc_pll_info *pll)
+{
+ return -EINVAL;
+}
+
+#endif /* __KERNEL__ */
+
+#endif /* _ASM__RTC_H */
+
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