On 12/10/07, Carl-Daniel Hailfinger <[EMAIL PROTECTED]> wrote:
> Thanks for the pointers. I will look into implementing SPI support for
> these cards in a week or so. Ping me if you don't see any code/questions
> until then.
Here is the code for a simple mmap based interface to the card. You'll need to
check lspci -v for the appropriate reg_addr and reg_len variables; the detection
code is quite big to include...
You're looking for a block of non-prefetchable memory exactly 64K in size; this
is from my card:
Memory at ff5f0000 (32-bit, non-prefetchable) [size=64K]
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
int mem_fd = -1;
unsigned int *reg_mem_map = NULL;
/*
* 05:00.0 VGA compatible controller: ATI Technologies Inc Radeon R350 [Radeon
9800 Pro] (prog-if 00 [VGA])
* Subsystem: ATI Technologies Inc Unknown device 0002
* Flags: bus master, stepping, 66MHz, medium devsel, latency 64, IRQ 16
* Memory at e8000000 (32-bit, prefetchable) [size=128M]
* I/O ports at c800 [size=256]
* Memory at ff5f0000 (32-bit, non-prefetchable) [size=64K]
* Expansion ROM at ff5c0000 [disabled] [size=128K]
* Capabilities: [58] AGP version 3.0
* Capabilities: [50] Power Management version 2
*/
unsigned int reg_addr = 0xff5f0000;
unsigned int reg_len = 0x10000;
unsigned int
register_read (unsigned int key)
{
return reg_mem_map[key >> 2];
}
void
register_write (unsigned int key, unsigned int val)
{
reg_mem_map[key >> 2] = val;
}
int
main (int argc, char **argv)
{
if ((mem_fd = open ("/dev/mem", O_RDWR)) < 0)
{
fprintf (stderr, "%s: %s:%d: %s\n", program_invocation_short_name,
__FILE__, __LINE__, strerror (errno));
exit (EXIT_FAILURE);
}
// detect_reg_aperture ();
if ((reg_mem_map =
mmap (NULL, reg_len, PROT_READ | PROT_WRITE, MAP_SHARED, mem_fd,
reg_addr)) == MAP_FAILED)
{
fprintf (stderr, "%s: %s:%d: %s\n", program_invocation_short_name,
__FILE__, __LINE__, strerror (errno));
exit (EXIT_FAILURE);
}
#if 1
printf ("0x148 = 0x%08x\n", register_read (0x148));
register_write (0xdead, 0xbeef);
#endif
if (munmap (reg_mem_map, reg_len) < 0)
{
fprintf (stderr, "%s: %s:%d: %s\n", program_invocation_short_name,
__FILE__, __LINE__, strerror (errno));
exit (EXIT_FAILURE);
}
if (close (mem_fd) < 0)
{
fprintf (stderr, "%s: %s:%d: %s\n", program_invocation_short_name,
__FILE__, __LINE__, strerror (errno));
exit (EXIT_FAILURE);
}
return 0;
}
--
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