Re: PIC question. (fwd)

[ollie lho]

On Thu, 2002-10-24 at 09:58, Adam Sulmicki wrote:
> > Is it possible that your BIOS reprogrammed the keyboard controller
> > in the wrong way ??
>
> it is possible, in fact it the only unchecked list on my To Check
> List:
>    PIC not getting (re) programmed		CHECK
>    PIC interrupt mask is wrong		CHECK
>    IF  flag being cleared			CHECK
>    keyboard controller			????
>
> so I guess that leaves the keyboard controller only.
> That brings me to the point, what sort of references did you
> use to write
>
> cvs-freebios/freebios/src/pc80/keyboard.c

Here is the more solid and well documented version which is used in our 
internal version of etherboot.

void pc_keyboard_init()
{
    volatile unsigned char regval;

/* ------------------- controller side ----------------------*/
    printf("reset keyboard \n");
    /* send cmd = 0xAA, self test 8042 */
    outb(0xaa, 0x64);

/* empty input buffer or any other command/data will be lost */
    while ((inb(0x64) & 0x02))
    	post_code(0);
    /* empty output buffer or any other command/data will be lost */
    while ((inb(0x64) & 0x01) == 0)
    	post_code(1);

/* read self-test result, 0x55 should be returned form 0x60 */
    if ((regval = inb(0x60) != 0x55))
    	printf("self test failed\n");

/* send cmd = 0xAA, keyboard interface test */
    outb(0xab, 0x64);

/* empty input buffer or any other command/data will be lost */
    while ((inb(0x64) & 0x02))
    	post_code(0);
    /* empty output buffer or any other command/data will be lost */
    while ((inb(0x64) & 0x01) == 0)
    	post_code(1);

/* read keyboard interface test result, 0x00 should be returned form
0x60 */
    if ((regval = inb(0x60) != 0x00))
    	printf("keyboard interface test failed\n");

/* Enable Keyboard clock */
    outb(0xae, 0x64);
    outb(0xa8, 0x64);

/* ------------------- keyboard side ------------------------*/
    /* reset kerboard and self test  (keyboard side) */
    outb(0xff, 0x60);
    /* empty inut buffer or any other command/data will be lost */
    while ((inb(0x64) & 0x02))
    	post_code(4);
    /* empty output buffer or any other command/data will be lost */
    while ((inb(0x64) & 0x01) == 0)
    	post_code(5);
    /* keyboard should return ACK */
    if ((regval = inb(0x60) != 0xfa))
    	printf("keyboard self test failed\n");

while ((inb(0x64) & 0x01) == 0)
    	post_code(6);
    if ((regval = inb(0x60) != 0xaa))
    	printf("keyboard self test failed\n");

/* Disable keyboard */
    outb(0xf5, 0x60);
    /* empty inut buffer or any other command/data will be lost */
    while ((inb(0x64) & 0x02))
    	post_code(4);
    /* empty output buffer or any other command/data will be lost */
    while ((inb(0x64) & 0x01) == 0)
    	post_code(5);
    /* keyboard should return ACK */
    if ((regval = inb(0x60) != 0xfa))
    	printf("disable keyboard failed\n");

/* Write Keyboard Mode */
    outb(0x60, 0x64);
    while ((inb(0x64) & 0x02))
    	post_code(2);
    /* send cmd: scan code convert, disable mouse, enable IRQ 1 */
    outb(0x61, 0x60);
    while ((inb(0x64) & 0x02))
    	post_code(3);

/* Enable keyboard */
    outb(0xf4, 0x60);
    /* empty inut buffer or any other command/data will be lost */
    while ((inb(0x64) & 0x02))
    	post_code(4);
    /* empty output buffer or any other command/data will be lost */
    while ((inb(0x64) & 0x01) == 0)
    	post_code(5);
    /* keyboard should return ACK */
    if ((regval = inb(0x60) != 0xfa))
    	printf("enable keyboard failed\n");
}