> Now, the question is : is it possible to make MergedFB works on an
> ibook ? I understand that UseFBDev should be set false, but I thought
> it is needed to make LCD works (without it LCD panel has
> synchros problem).
>
> I can imagine that kernel radeonfb and X are competing for access to the
> card. Is it true ? Should I use a different /dev/fb? device ? I imagine
> that radeonfb is needed anyway.
Unless somebody hacked XFree to be able to re-use the existing PLL
value, most iBooks will have synchro problems indeed. I posted a
hack a while ago that may "fix" it up though, let me check if
I still have it ...
#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <unistd.h>
#include <byteswap.h>
#include <linux/fb.h>
#include <errno.h>
#include "radeon.h"
void * mmio;
#define RADEON_RBASE 0xb0000000
//#define RADEON_RBASE 0x90000000
static inline unsigned char regr8(void *base, const unsigned long offset)
{
unsigned char val;
__asm__ __volatile__(
"lbzx %0,%1,%2\n\t"
"eieio"
: "=r" (val)
: "b" (base), "r" (offset),
"m" (*((volatile unsigned char *)base+offset)));
return(val);
}
static inline void regw8(void *base, const unsigned long offset,
const unsigned char val)
{
__asm__ __volatile__ ("stbx %1,%2,%3\n\t"
"eieio"
: "=m" (*((volatile unsigned char *)base+offset))
: "r" (val), "b" (base), "r" (offset));
}
static inline unsigned int regr(void *base, const unsigned long offset)
{
unsigned int val;
__asm__ __volatile__ ("lwbrx %0,%1,%2\n\t"
"eieio"
: "=r" (val)
: "b" (base), "r"(offset),
"m" (*((volatile unsigned char *)base+offset)));
return val;
}
static inline void regw(void *base, const unsigned long offset,
const unsigned int val)
{
__asm__ __volatile__ ("stwbrx %1,%2,%3\n\t"
"eieio"
: "=m" (*((volatile unsigned char
*)base+offset))
: "r"(val), "b"(base), "r"(offset));
}
static inline unsigned int pllr(void *base, const unsigned long index)
{
unsigned int val;
regw8(base, 0x8, index & 0x3f);
return regr(base, 0xc);
}
#define INREG(r) regr(mmio, (r))
#define OUTREG(r, v) regw(mmio, (r), (v))
#define INREG8(r) regr8(mmio, (r))
#define OUTREG8(r, v) regw8(mmio, (r), (v))
#define OUTPLL(addr,val) \
do { \
OUTREG8(CLOCK_CNTL_INDEX, (addr & 0x0000003f) | 0x00000080); \
OUTREG(CLOCK_CNTL_DATA, val); \
} while(0)
static inline unsigned long _INPLL(unsigned long addr)
{
OUTREG8(CLOCK_CNTL_INDEX, addr & 0x0000003f);
return (INREG(CLOCK_CNTL_DATA));
}
#define INPLL(addr) _INPLL(addr)
int main() {
int fd, fbfd, i;
unsigned int cci;
struct fb_fix_screeninfo fix;
fbfd = open("/dev/fb0", O_RDWR);
if (fbfd == -1) {
perror("cannot open framebuffer\n");
return ENODEV;
}
if (ioctl(fbfd, FBIOGET_FSCREENINFO, &fix)) {
perror("cannot get sceen info\n");
return ENODEV;
}
if (fix.accel != FB_ACCEL_ATI_RADEON) {
fprintf(stderr, "not a radeon !\n");
return ENODEV;
}
fd = open("/dev/mem", O_RDWR);
if (fd == -1) {
perror("cannot open /dev/mem\n");
return ENODEV;
}
mmio = (void *)mmap(0, 0x80000, PROT_READ|PROT_WRITE,
MAP_SHARED, fd, fix.mmio_start);
/* Force switch to PLL0 */
printf("Frobbing radeon PLL...\n");
cci = INREG(8);
OUTREG(8, cci & ~0x00000300);
}
