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Diffstat (limited to 'include/asm-x86/mc146818rtc.h')
| -rw-r--r-- | include/asm-x86/mc146818rtc.h | 104 |
1 files changed, 0 insertions, 104 deletions
diff --git a/include/asm-x86/mc146818rtc.h b/include/asm-x86/mc146818rtc.h deleted file mode 100644 index a995f33176cd..000000000000 --- a/include/asm-x86/mc146818rtc.h +++ /dev/null @@ -1,104 +0,0 @@ -/* - * Machine dependent access functions for RTC registers. - */ -#ifndef ASM_X86__MC146818RTC_H -#define ASM_X86__MC146818RTC_H - -#include <asm/io.h> -#include <asm/system.h> -#include <asm/processor.h> -#include <linux/mc146818rtc.h> - -#ifndef RTC_PORT -#define RTC_PORT(x) (0x70 + (x)) -#define RTC_ALWAYS_BCD 1 /* RTC operates in binary mode */ -#endif - -#if defined(CONFIG_X86_32) && defined(__HAVE_ARCH_CMPXCHG) -/* - * This lock provides nmi access to the CMOS/RTC registers. It has some - * special properties. It is owned by a CPU and stores the index register - * currently being accessed (if owned). The idea here is that it works - * like a normal lock (normally). However, in an NMI, the NMI code will - * first check to see if its CPU owns the lock, meaning that the NMI - * interrupted during the read/write of the device. If it does, it goes ahead - * and performs the access and then restores the index register. If it does - * not, it locks normally. - * - * Note that since we are working with NMIs, we need this lock even in - * a non-SMP machine just to mark that the lock is owned. - * - * This only works with compare-and-swap. There is no other way to - * atomically claim the lock and set the owner. - */ -#include <linux/smp.h> -extern volatile unsigned long cmos_lock; - -/* - * All of these below must be called with interrupts off, preempt - * disabled, etc. - */ - -static inline void lock_cmos(unsigned char reg) -{ - unsigned long new; - new = ((smp_processor_id() + 1) << 8) | reg; - for (;;) { - if (cmos_lock) { - cpu_relax(); - continue; - } - if (__cmpxchg(&cmos_lock, 0, new, sizeof(cmos_lock)) == 0) - return; - } -} - -static inline void unlock_cmos(void) -{ - cmos_lock = 0; -} - -static inline int do_i_have_lock_cmos(void) -{ - return (cmos_lock >> 8) == (smp_processor_id() + 1); -} - -static inline unsigned char current_lock_cmos_reg(void) -{ - return cmos_lock & 0xff; -} - -#define lock_cmos_prefix(reg) \ - do { \ - unsigned long cmos_flags; \ - local_irq_save(cmos_flags); \ - lock_cmos(reg) - -#define lock_cmos_suffix(reg) \ - unlock_cmos(); \ - local_irq_restore(cmos_flags); \ - } while (0) -#else -#define lock_cmos_prefix(reg) do {} while (0) -#define lock_cmos_suffix(reg) do {} while (0) -#define lock_cmos(reg) -#define unlock_cmos() -#define do_i_have_lock_cmos() 0 -#define current_lock_cmos_reg() 0 -#endif - -/* - * The yet supported machines all access the RTC index register via - * an ISA port access but the way to access the date register differs ... - */ -#define CMOS_READ(addr) rtc_cmos_read(addr) -#define CMOS_WRITE(val, addr) rtc_cmos_write(val, addr) -unsigned char rtc_cmos_read(unsigned char addr); -void rtc_cmos_write(unsigned char val, unsigned char addr); - -extern int mach_set_rtc_mmss(unsigned long nowtime); -extern unsigned long mach_get_cmos_time(void); - -#define RTC_IRQ 8 - -#endif /* ASM_X86__MC146818RTC_H */ |
