| 1 | // SPDX-License-Identifier: GPL-2.0 |
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| 2 | /* |
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| 3 | * linux/arch/mips/sni/process.c |
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| 4 | * |
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| 5 | * Reset a SNI machine. |
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| 6 | */ |
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| 7 | #include <linux/delay.h> |
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| 8 | |
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| 9 | #include <asm/io.h> |
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| 10 | #include <asm/reboot.h> |
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| 11 | #include <asm/sni.h> |
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| 12 | |
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| 13 | /* |
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| 14 | * This routine reboots the machine by asking the keyboard |
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| 15 | * controller to pulse the reset-line low. We try that for a while, |
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| 16 | * and if it doesn't work, we do some other stupid things. |
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| 17 | */ |
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| 18 | static inline void kb_wait(void) |
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| 19 | { |
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| 20 | int i; |
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| 21 | |
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| 22 | for (i = 0; i < 0x10000; i++) |
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| 23 | if ((inb_p(port: 0x64) & 0x02) == 0) |
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| 24 | break; |
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| 25 | } |
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| 26 | |
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| 27 | /* XXX This ends up at the ARC firmware prompt ... */ |
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| 28 | void sni_machine_restart(char *command) |
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| 29 | { |
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| 30 | int i; |
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| 31 | |
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| 32 | /* This does a normal via the keyboard controller like a PC. |
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| 33 | We can do that easier ... */ |
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| 34 | local_irq_disable(); |
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| 35 | for (;;) { |
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| 36 | for (i = 0; i < 100; i++) { |
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| 37 | kb_wait(); |
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| 38 | udelay(50); |
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| 39 | outb_p(value: 0xfe, port: 0x64); /* pulse reset low */ |
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| 40 | udelay(50); |
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| 41 | } |
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| 42 | } |
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| 43 | } |
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| 44 | |
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| 45 | void sni_machine_power_off(void) |
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| 46 | { |
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| 47 | *(volatile unsigned char *)PCIMT_CSWCSM = 0xfd; |
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| 48 | } |
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| 49 | |
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