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yaml --- r: 200779 b: refs/heads/master c: 1817176 h: refs/heads/master i: 200777: e37097c 200775: 6732363 v: v3
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Dan Rosenberg
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Dave Chinner
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Jun 24, 2010
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refs/heads/master: 744c557892d3bfb575287ee95947f5c0b9a0458f | ||
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/* | ||
* linux/arch/alpha/kernel/ns87312.c | ||
*/ | ||
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#include <linux/init.h> | ||
#include <asm/io.h> | ||
#include "proto.h" | ||
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/* | ||
* The SRM console *disables* the IDE interface, this code ensures it's | ||
* enabled. | ||
* | ||
* This code bangs on a control register of the 87312 Super I/O chip | ||
* that implements parallel port/serial ports/IDE/FDI. Depending on | ||
* the motherboard, the Super I/O chip can be configured through a | ||
* pair of registers that are located either at I/O ports 0x26e/0x26f | ||
* or 0x398/0x399. Unfortunately, autodetecting which base address is | ||
* in use works only once (right after a reset). The Super I/O chip | ||
* has the additional quirk that configuration register data must be | ||
* written twice (I believe this is a safety feature to prevent | ||
* accidental modification---fun, isn't it?). | ||
*/ | ||
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void __init | ||
ns87312_enable_ide(long ide_base) | ||
{ | ||
int data; | ||
unsigned long flags; | ||
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local_irq_save(flags); | ||
outb(0, ide_base); /* set the index register for reg #0 */ | ||
data = inb(ide_base+1); /* read the current contents */ | ||
outb(0, ide_base); /* set the index register for reg #0 */ | ||
outb(data | 0x40, ide_base+1); /* turn on IDE */ | ||
outb(data | 0x40, ide_base+1); /* turn on IDE, really! */ | ||
local_irq_restore(flags); | ||
} |
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