diff options
Diffstat (limited to 'c/src/lib/libbsp/powerpc/shared/pci/pcifinddevice.c')
| -rw-r--r-- | c/src/lib/libbsp/powerpc/shared/pci/pcifinddevice.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/powerpc/shared/pci/pcifinddevice.c b/c/src/lib/libbsp/powerpc/shared/pci/pcifinddevice.c new file mode 100644 index 0000000000..a1d2a0d3ad --- /dev/null +++ b/c/src/lib/libbsp/powerpc/shared/pci/pcifinddevice.c @@ -0,0 +1,55 @@ + +/* Author: Till Straumann <strauman@slac.stanford.edu>, 2001 */ + +/* find a particular PCI device + * (we assume, the firmware configured the PCI bus[es] for us) + * + * $Id$ + */ + +#define PCI_INVALID_VENDORDEVICEID 0xffffffff +#define PCI_MULTI_FUNCTION 0x80 + +#include <bsp/pci.h> +#include <rtems/bspIo.h> + +int +BSP_pciFindDevice(unsigned short vendorid, unsigned short deviceid, + int instance, int *pbus, int *pdev, int *pfun) +{ +unsigned int d; +unsigned short s; +unsigned char bus,dev,fun,hd; + + for (bus=0; bus<BusCountPCI(); bus++) { + for (dev=0; dev<PCI_MAX_DEVICES; dev++) { + + pci_read_config_byte(bus,dev,0, PCI_HEADER_TYPE, &hd); + hd = (hd & PCI_MULTI_FUNCTION ? PCI_MAX_FUNCTIONS : 1); + + for (fun=0; fun<hd; fun++) { + /* + * The last devfn id/slot is special; must skip it + */ + if (PCI_MAX_DEVICES-1==dev && PCI_MAX_FUNCTIONS-1 == fun) + break; + (void)pci_read_config_dword(bus,dev,fun,PCI_VENDOR_ID,&d); + if (PCI_INVALID_VENDORDEVICEID == d) + continue; +#ifdef PCI_DEBUG + printk("BSP_pciFindDevice: found 0x%08x at %i/%i/%i\n",d,bus,dev,fun); +#endif + (void) pci_read_config_word(bus,dev,fun,PCI_VENDOR_ID,&s); + if (vendorid != s) + continue; + (void) pci_read_config_word(bus,dev,fun,PCI_DEVICE_ID,&s); + if (deviceid == s) { + if (instance--) continue; + *pbus=bus; *pdev=dev; *pfun=fun; + return 0; + } + } + } + } + return -1; +} |