Commit 7309282c authored by Feng Tang's avatar Feng Tang Committed by Thomas Gleixner
Browse files

x86: mrst: Add vrtc driver which serves as a wall clock device 



Moorestown platform doesn't have a m146818 RTC device like traditional
x86 PC, but a firmware emulated virtual RTC device(vrtc), which provides
some basic RTC functions like get/set time. vrtc serves as the only
wall clock device on Moorestown platform.

[ tglx: Changed the exports to _GPL ]

Signed-off-by: default avatarFeng Tang <feng.tang@intel.com>
Signed-off-by: default avatarJacob Pan <jacob.jun.pan@linux.intel.com>
Signed-off-by: default avatarAlan Cox <alan@linux.intel.com>
LKML-Reference: <20101110172837.3311.40483.stgit@localhost.localdomain>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent cfb505a7

arch/x86/include/asm/fixmap.h

+4 −0
Original line number Diff line number Diff line
@@ -117,6 +117,10 @@ enum fixed_addresses { 
	FIX_TEXT_POKE1,	/* reserve 2 pages for text_poke() */

	FIX_TEXT_POKE0, /* first page is last, because allocation is backward */

	__end_of_permanent_fixed_addresses,



#ifdef	CONFIG_X86_MRST

	FIX_LNW_VRTC,

#endif

	/*

	 * 256 temporary boot-time mappings, used by early_ioremap(),

	 * before ioremap() is functional.

arch/x86/include/asm/mrst-vrtc.h

0 → 100644
+9 −0
Original line number Diff line number Diff line 
#ifndef _MRST_VRTC_H

#define _MRST_VRTC_H



extern unsigned char vrtc_cmos_read(unsigned char reg);

extern void vrtc_cmos_write(unsigned char val, unsigned char reg);

extern unsigned long vrtc_get_time(void);

extern int vrtc_set_mmss(unsigned long nowtime);



#endif

arch/x86/include/asm/mrst.h

+9 −1
Original line number Diff line number Diff line
@@ -14,7 +14,9 @@ 
#include <linux/sfi.h>



extern int pci_mrst_init(void);

int __init sfi_parse_mrtc(struct sfi_table_header *table);

extern int __init sfi_parse_mrtc(struct sfi_table_header *table);

extern int sfi_mrtc_num;

extern struct sfi_rtc_table_entry sfi_mrtc_array[];



/*

 * Medfield is the follow-up of Moorestown, it combines two chip solution into
@@ -54,4 +56,10 @@ extern void hsu_early_console_init(void); 
extern void intel_scu_devices_create(void);

extern void intel_scu_devices_destroy(void);



/* VRTC timer */

#define MRST_VRTC_MAP_SZ	(1024)

/*#define MRST_VRTC_PGOFFSET	(0xc00) */



extern void mrst_rtc_init(void);



#endif /* _ASM_X86_MRST_H */

arch/x86/platform/mrst/Makefile

+1 −0
Original line number Diff line number Diff line 
obj-$(CONFIG_X86_MRST)		+= mrst.o

obj-$(CONFIG_X86_MRST)		+= vrtc.o

arch/x86/platform/mrst/mrst.c

+0 −6
Original line number Diff line number Diff line
@@ -37,7 +37,6 @@ 
#include <asm/apb_timer.h>

#include <asm/reboot.h>





/*

 * the clockevent devices on Moorestown/Medfield can be APBT or LAPIC clock,

 * cmdline option x86_mrst_timer can be used to override the configuration
@@ -242,11 +241,6 @@ void __init mrst_time_init(void) 
	apbt_time_init();

}



void __init mrst_rtc_init(void)

{

	sfi_table_parse(SFI_SIG_MRTC, NULL, NULL, sfi_parse_mrtc);

}



void __cpuinit mrst_arch_setup(void)

{

	if (boot_cpu_data.x86 == 6 && boot_cpu_data.x86_model == 0x27)

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