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Satish
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Tony Lindgren
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Jun 9, 2010
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refs/heads/master: 5e9772b95ba848516b2c76c11cf6f4aa4aa232a5 | ||
refs/heads/master: 7f1225bd6e62c54edfa0a2464648ad9e4efb1313 |
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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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