cregit-Linux how code gets into the kernel

Release 4.14 arch/powerpc/platforms/maple/time.c

/*
 *  (c) Copyright 2004 Benjamin Herrenschmidt (benh@kernel.crashing.org),
 *                     IBM Corp. 
 *
 *  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.
 *
 */


#undef DEBUG

#include <linux/errno.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/param.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/time.h>
#include <linux/adb.h>
#include <linux/pmu.h>
#include <linux/interrupt.h>
#include <linux/mc146818rtc.h>
#include <linux/bcd.h>

#include <asm/sections.h>
#include <asm/prom.h>
#include <asm/io.h>
#include <asm/pgtable.h>
#include <asm/machdep.h>
#include <asm/time.h>

#include "maple.h"

#ifdef DEBUG

#define DBG(x...) printk(x)
#else

#define DBG(x...)
#endif


static int maple_rtc_addr;


static int maple_clock_read(int addr) { outb_p(addr, maple_rtc_addr); return inb_p(maple_rtc_addr+1); }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt24100.00%1100.00%
Total24100.00%1100.00%


static void maple_clock_write(unsigned long val, int addr) { outb_p(addr, maple_rtc_addr); outb_p(val, maple_rtc_addr+1); }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt29100.00%1100.00%
Total29100.00%1100.00%


void maple_get_rtc_time(struct rtc_time *tm) { do { tm->tm_sec = maple_clock_read(RTC_SECONDS); tm->tm_min = maple_clock_read(RTC_MINUTES); tm->tm_hour = maple_clock_read(RTC_HOURS); tm->tm_mday = maple_clock_read(RTC_DAY_OF_MONTH); tm->tm_mon = maple_clock_read(RTC_MONTH); tm->tm_year = maple_clock_read(RTC_YEAR); } while (tm->tm_sec != maple_clock_read(RTC_SECONDS)); if (!(maple_clock_read(RTC_CONTROL) & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { tm->tm_sec = bcd2bin(tm->tm_sec); tm->tm_min = bcd2bin(tm->tm_min); tm->tm_hour = bcd2bin(tm->tm_hour); tm->tm_mday = bcd2bin(tm->tm_mday); tm->tm_mon = bcd2bin(tm->tm_mon); tm->tm_year = bcd2bin(tm->tm_year); } if ((tm->tm_year + 1900) < 1970) tm->tm_year += 100; tm->tm_wday = -1; }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt14175.81%125.00%
Adrian Bunk3016.13%125.00%
Matt Mackall105.38%125.00%
Daniel Axtens52.69%125.00%
Total186100.00%4100.00%


int maple_set_rtc_time(struct rtc_time *tm) { unsigned char save_control, save_freq_select; int sec, min, hour, mon, mday, year; spin_lock(&rtc_lock); save_control = maple_clock_read(RTC_CONTROL); /* tell the clock it's being set */ maple_clock_write((save_control|RTC_SET), RTC_CONTROL); save_freq_select = maple_clock_read(RTC_FREQ_SELECT); /* stop and reset prescaler */ maple_clock_write((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT); sec = tm->tm_sec; min = tm->tm_min; hour = tm->tm_hour; mon = tm->tm_mon; mday = tm->tm_mday; year = tm->tm_year; if (!(save_control & RTC_DM_BINARY) || RTC_ALWAYS_BCD) { sec = bin2bcd(sec); min = bin2bcd(min); hour = bin2bcd(hour); mon = bin2bcd(mon); mday = bin2bcd(mday); year = bin2bcd(year); } maple_clock_write(sec, RTC_SECONDS); maple_clock_write(min, RTC_MINUTES); maple_clock_write(hour, RTC_HOURS); maple_clock_write(mon, RTC_MONTH); maple_clock_write(mday, RTC_DAY_OF_MONTH); maple_clock_write(year, RTC_YEAR); /* The following flags have to be released exactly in this order, * otherwise the DS12887 (popular MC146818A clone with integrated * battery and quartz) will not reset the oscillator and will not * update precisely 500 ms later. You won't find this mentioned in * the Dallas Semiconductor data sheets, but who believes data * sheets anyway ... -- Markus Kuhn */ maple_clock_write(save_control, RTC_CONTROL); maple_clock_write(save_freq_select, RTC_FREQ_SELECT); spin_unlock(&rtc_lock); return 0; }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt21292.17%150.00%
Adrian Bunk187.83%150.00%
Total230100.00%2100.00%

static struct resource rtc_iores = { .name = "rtc", .flags = IORESOURCE_BUSY, };
unsigned long __init maple_get_boot_time(void) { struct rtc_time tm; struct device_node *rtcs; rtcs = of_find_compatible_node(NULL, "rtc", "pnpPNP,b00"); if (rtcs) { struct resource r; if (of_address_to_resource(rtcs, 0, &r)) { printk(KERN_EMERG "Maple: Unable to translate RTC" " address\n"); goto bail; } if (!(r.flags & IORESOURCE_IO)) { printk(KERN_EMERG "Maple: RTC address isn't PIO!\n"); goto bail; } maple_rtc_addr = r.start; printk(KERN_INFO "Maple: Found RTC at IO 0x%x\n", maple_rtc_addr); } bail: if (maple_rtc_addr == 0) { maple_rtc_addr = RTC_PORT(0); /* legacy address */ printk(KERN_INFO "Maple: No device node for RTC, assuming " "legacy address (0x%x)\n", maple_rtc_addr); } rtc_iores.start = maple_rtc_addr; rtc_iores.end = maple_rtc_addr + 7; request_resource(&ioport_resource, &rtc_iores); maple_get_rtc_time(&tm); return mktime(tm.tm_year+1900, tm.tm_mon+1, tm.tm_mday, tm.tm_hour, tm.tm_min, tm.tm_sec); }

Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt12566.84%240.00%
Paul Mackerras3920.86%240.00%
Segher Boessenkool2312.30%120.00%
Total187100.00%5100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
Benjamin Herrenschmidt61780.87%220.00%
Adrian Bunk486.29%110.00%
Paul Mackerras425.50%330.00%
Segher Boessenkool405.24%110.00%
Matt Mackall101.31%110.00%
Daniel Axtens50.66%110.00%
Jon Mason10.13%110.00%
Total763100.00%10100.00%
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