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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: Russell King <rmk+kernel@arm.linux.org.uk>
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1 changed files with 109 additions and 1 deletions
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@ -32,9 +32,11 @@
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* added changelog
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* 1.2 Erik Gilling: Cobalt Networks support
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* Tim Hockin: general cleanup, Cobalt support
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* 1.3 Jon Ringle: Comdial MP1000 support
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*
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*/
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#define NVRAM_VERSION "1.2"
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#define NVRAM_VERSION "1.3"
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#include <linux/module.h>
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#include <linux/config.h>
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@ -45,6 +47,7 @@
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#define PC 1
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#define ATARI 2
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#define COBALT 3
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#define MP1000 4
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/* select machine configuration */
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#if defined(CONFIG_ATARI)
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@ -54,6 +57,9 @@
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# if defined(CONFIG_COBALT)
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# include <linux/cobalt-nvram.h>
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# define MACH COBALT
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# elif defined(CONFIG_MACH_MP1000)
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# undef MACH
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# define MACH MP1000
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# else
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# define MACH PC
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# endif
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@ -112,6 +118,23 @@
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#endif
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#if MACH == MP1000
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/* RTC in a MP1000 */
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#define CHECK_DRIVER_INIT() 1
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#define MP1000_CKS_RANGE_START 0
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#define MP1000_CKS_RANGE_END 111
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#define MP1000_CKS_LOC 112
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#define NVRAM_BYTES (128-NVRAM_FIRST_BYTE)
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#define mach_check_checksum mp1000_check_checksum
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#define mach_set_checksum mp1000_set_checksum
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#define mach_proc_infos mp1000_proc_infos
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#endif
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/* Note that *all* calls to CMOS_READ and CMOS_WRITE must be done with
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* rtc_lock held. Due to the index-port/data-port design of the RTC, we
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* don't want two different things trying to get to it at once. (e.g. the
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@ -915,6 +938,91 @@ atari_proc_infos(unsigned char *nvram, char *buffer, int *len,
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#endif /* MACH == ATARI */
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#if MACH == MP1000
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static int
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mp1000_check_checksum(void)
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{
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int i;
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unsigned short sum = 0;
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unsigned short expect;
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for (i = MP1000_CKS_RANGE_START; i <= MP1000_CKS_RANGE_END; ++i)
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sum += __nvram_read_byte(i);
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expect = __nvram_read_byte(MP1000_CKS_LOC+1)<<8 |
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__nvram_read_byte(MP1000_CKS_LOC);
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return ((sum & 0xffff) == expect);
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}
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static void
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mp1000_set_checksum(void)
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{
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int i;
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unsigned short sum = 0;
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for (i = MP1000_CKS_RANGE_START; i <= MP1000_CKS_RANGE_END; ++i)
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sum += __nvram_read_byte(i);
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__nvram_write_byte(sum >> 8, MP1000_CKS_LOC + 1);
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__nvram_write_byte(sum & 0xff, MP1000_CKS_LOC);
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}
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#ifdef CONFIG_PROC_FS
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#define SERVER_N_LEN 32
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#define PATH_N_LEN 32
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#define FILE_N_LEN 32
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#define NVRAM_MAGIC_SIG 0xdead
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typedef struct NvRamImage
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{
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unsigned short int magic;
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unsigned short int mode;
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char fname[FILE_N_LEN];
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char path[PATH_N_LEN];
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char server[SERVER_N_LEN];
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char pad[12];
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} NvRam;
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static int
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mp1000_proc_infos(unsigned char *nvram, char *buffer, int *len,
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off_t *begin, off_t offset, int size)
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{
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int checksum;
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NvRam* nv = (NvRam*)nvram;
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spin_lock_irq(&rtc_lock);
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checksum = __nvram_check_checksum();
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spin_unlock_irq(&rtc_lock);
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PRINT_PROC("Checksum status: %svalid\n", checksum ? "" : "not ");
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switch( nv->mode )
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{
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case 0 :
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PRINT_PROC( "\tMode 0, tftp prompt\n" );
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break;
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case 1 :
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PRINT_PROC( "\tMode 1, booting from disk\n" );
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break;
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case 2 :
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PRINT_PROC( "\tMode 2, Alternate boot from disk /boot/%s\n", nv->fname );
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break;
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case 3 :
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PRINT_PROC( "\tMode 3, Booting from net:\n" );
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PRINT_PROC( "\t\t%s:%s%s\n",nv->server, nv->path, nv->fname );
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break;
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default:
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PRINT_PROC( "\tInconsistant nvram?\n" );
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break;
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}
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return 1;
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}
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#endif
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#endif /* MACH == MP1000 */
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MODULE_LICENSE("GPL");
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EXPORT_SYMBOL(__nvram_read_byte);
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