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arch/mips/jazz/reset.c
1009 Bytes
1da177e4c Linux-2.6.12-rc2 |
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/* * Reset a Jazz machine. * * We don't trust the firmware so we do it the classic way by poking and * stabbing at the keyboard controller ... */ #include <linux/jiffies.h> #include <asm/jazz.h> |
1da177e4c Linux-2.6.12-rc2 |
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#define KBD_STAT_IBF 0x02 /* Keyboard input buffer full */ static void jazz_write_output(unsigned char val) { int status; do { status = jazz_kh->command; } while (status & KBD_STAT_IBF); jazz_kh->data = val; } static void jazz_write_command(unsigned char val) { int status; do { status = jazz_kh->command; } while (status & KBD_STAT_IBF); jazz_kh->command = val; } static unsigned char jazz_read_status(void) { return jazz_kh->command; } static inline void kb_wait(void) { unsigned long start = jiffies; unsigned long timeout = start + HZ/2; do { if (! (jazz_read_status() & 0x02)) return; } while (time_before_eq(jiffies, timeout)); } void jazz_machine_restart(char *command) { while(1) { kb_wait(); |
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jazz_write_command(0xd1); |
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kb_wait(); |
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jazz_write_output(0x00); |
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} } |