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Commit dd5b295f authored by Jon Ringle's avatar Jon Ringle Committed by Russell King
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[ARM] 2921/1: Support for the RTC / nvram on the Comdial MP1000 



Patch from Jon Ringle

This adds support for the RTC and nvram on the Comdial MP1000

Signed-off-by: Jon Ringle
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
parent d9e29649

drivers/char/nvram.c

+109 −1
Original line number Original line Diff line number Diff line
@@ -32,9 +32,11 @@ 
 * 		added changelog

 * 		added changelog

 * 	1.2	Erik Gilling: Cobalt Networks support

 * 	1.2	Erik Gilling: Cobalt Networks support

 * 		Tim Hockin: general cleanup, Cobalt support

 * 		Tim Hockin: general cleanup, Cobalt support

 * 	1.3	Jon Ringle: Comdial MP1000 support

 *

 */

 */





#define NVRAM_VERSION	"1.2"

#define NVRAM_VERSION	"1.3"





#include <linux/module.h>

#include <linux/module.h>

#include <linux/config.h>

#include <linux/config.h>
@@ -45,6 +47,7 @@ 
#define PC		1

#define PC		1

#define ATARI		2

#define ATARI		2

#define COBALT		3

#define COBALT		3

#define MP1000		4





/* select machine configuration */

/* select machine configuration */

#if defined(CONFIG_ATARI)

#if defined(CONFIG_ATARI)
@@ -54,6 +57,9 @@ 
#  if defined(CONFIG_COBALT)

#  if defined(CONFIG_COBALT)

#    include <linux/cobalt-nvram.h>

#    include <linux/cobalt-nvram.h>

#    define MACH COBALT

#    define MACH COBALT

#  elif defined(CONFIG_MACH_MP1000)

#    undef MACH

#    define MACH MP1000

#  else

#  else

#    define MACH PC

#    define MACH PC

#  endif

#  endif
@@ -112,6 +118,23 @@ 




#endif

#endif





#if MACH == MP1000



/* RTC in a MP1000 */

#define CHECK_DRIVER_INIT()	1



#define MP1000_CKS_RANGE_START	0

#define MP1000_CKS_RANGE_END	111

#define MP1000_CKS_LOC		112



#define NVRAM_BYTES		(128-NVRAM_FIRST_BYTE)



#define mach_check_checksum	mp1000_check_checksum

#define mach_set_checksum	mp1000_set_checksum

#define mach_proc_infos		mp1000_proc_infos



#endif



/* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with

/* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with

 * rtc_lock held. Due to the index-port/data-port design of the RTC, we

 * rtc_lock held. Due to the index-port/data-port design of the RTC, we

 * don't want two different things trying to get to it at once. (e.g. the

 * don't want two different things trying to get to it at once. (e.g. the
@@ -915,6 +938,91 @@ atari_proc_infos(unsigned char *nvram, char *buffer, int *len, 




#endif /* MACH == ATARI */

#endif /* MACH == ATARI */





#if MACH == MP1000



static int

mp1000_check_checksum(void)

{

	int i;

	unsigned short sum = 0;

	unsigned short expect;



	for (i = MP1000_CKS_RANGE_START; i <= MP1000_CKS_RANGE_END; ++i)

		sum += __nvram_read_byte(i);



        expect = __nvram_read_byte(MP1000_CKS_LOC+1)<<8 |

	    __nvram_read_byte(MP1000_CKS_LOC);

	return ((sum & 0xffff) == expect);

}



static void

mp1000_set_checksum(void)

{

	int i;

	unsigned short sum = 0;



	for (i = MP1000_CKS_RANGE_START; i <= MP1000_CKS_RANGE_END; ++i)

		sum += __nvram_read_byte(i);

	__nvram_write_byte(sum >> 8, MP1000_CKS_LOC + 1);

	__nvram_write_byte(sum & 0xff, MP1000_CKS_LOC);

}



#ifdef CONFIG_PROC_FS



#define         SERVER_N_LEN         32

#define         PATH_N_LEN           32

#define         FILE_N_LEN           32

#define         NVRAM_MAGIC_SIG      0xdead



typedef struct NvRamImage

{

	unsigned short int    magic;

	unsigned short int    mode;

	char                  fname[FILE_N_LEN];

	char                  path[PATH_N_LEN];

	char                  server[SERVER_N_LEN];

	char                  pad[12];

} NvRam;



static int

mp1000_proc_infos(unsigned char *nvram, char *buffer, int *len,

    off_t *begin, off_t offset, int size)

{

	int checksum;

        NvRam* nv = (NvRam*)nvram;



	spin_lock_irq(&rtc_lock);

	checksum = __nvram_check_checksum();

	spin_unlock_irq(&rtc_lock);



	PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not ");



        switch( nv->mode )

        {

           case 0 :

                    PRINT_PROC( "\tMode 0, tftp prompt\n" );

                    break;

           case 1 :

                    PRINT_PROC( "\tMode 1, booting from disk\n" );

                    break;

           case 2 :

                    PRINT_PROC( "\tMode 2, Alternate boot from disk /boot/%s\n", nv->fname );

                    break;

           case 3 :

                    PRINT_PROC( "\tMode 3, Booting from net:\n" );

                    PRINT_PROC( "\t\t%s:%s%s\n",nv->server, nv->path, nv->fname );

                    break;

           default:

                    PRINT_PROC( "\tInconsistant nvram?\n" );

                    break;

        }



	return 1;

}

#endif



#endif /* MACH == MP1000 */



MODULE_LICENSE("GPL");

MODULE_LICENSE("GPL");





EXPORT_SYMBOL(__nvram_read_byte);

EXPORT_SYMBOL(__nvram_read_byte);