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superio support for sis 950

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This commit is contained in:
Ronald G. Minnich 2000-10-23 19:20:08 +00:00
parent a2df0ebecd
commit cfd9176456
1 changed files with 67 additions and 0 deletions
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67
src/superio/sis/950/superio.c Normal file
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// just define these here. We may never need them anywhere else
#define PNP_COM1_DEVICE 0x1
#define PNP_COM2_DEVICE 0x2
#include <subr.h>
#include <cpu/p5/io.h>
void
enter_pnp()
{
// unlock it XXX make this a subr at some point
outb(0x87, 0x2e);
outb(0x01, 0x2e);
outb(0x55, 0x2e);
outb(0x55, 0x2e);
}
void
exit_pnp()
{
/* all done. */
// select configure control
outb(2, 0x2e);
outb(2, 0x2f);
}
#ifdef MUST_ENABLE_FLOPPY
void enable_floppy()
{
/* now set the LDN to floppy LDN */
outb(0x7, 0x2e); /* pick reg. 7 */
outb(0x0, 0x2f); /* LDN 0 to reg. 7 */
/* now select register 0x30, and set bit 1 in that register */
outb(0x30, 0x2e);
outb(0x1, 0x2f);
}
#endif /* MUST_ENABLE_FLOPPY */
void
enable_com(int com)
{
/* now set the LDN to com LDN */
outb(0x7, 0x2e); /* pick reg. 7 */
outb(com, 0x2f); /* LDN 0 to reg. 7 */
/* now select register 0x30, and set bit 1 in that register */
outb(0x30, 0x2e);
outb(0x1, 0x2f);
}
void
final_superio_fixup()
{
enter_pnp();
#ifdef MUST_ENABLE_FLOPPY
enable_floppy();
#endif
enable_com(PNP_COM1_DEVICE);
enable_com(PNP_COM2_DEVICE);
exit_pnp();
}