diff options
author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/alpha/kernel/ns87312.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/alpha/kernel/ns87312.c')
-rw-r--r-- | arch/alpha/kernel/ns87312.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/arch/alpha/kernel/ns87312.c b/arch/alpha/kernel/ns87312.c new file mode 100644 index 000000000000..342b56d24c20 --- /dev/null +++ b/arch/alpha/kernel/ns87312.c @@ -0,0 +1,38 @@ +/* + * linux/arch/alpha/kernel/ns87312.c + */ + +#include <linux/init.h> +#include <asm/io.h> +#include "proto.h" + + +/* + * 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?). + */ + +void __init +ns87312_enable_ide(long ide_base) +{ + int data; + unsigned long flags; + + 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); +} |