1995/0725/pc/pci.c (diff list | history)

1995/0721/sys/src/9/pc/pci.c:1,3 – 1995/0725/sys/src/9/pc/pci.c:1,7 (short | long | prev | next)
1995/0725		/* * Trivial PCI configuration code. * Only deals with bus 0, amongst other glaring omissions. */
1995/0517		#include "u.h" #include "../port/lib.h" #include "mem.h"
1995/0721/sys/src/9/pc/pci.c:8,13 – 1995/0725/sys/src/9/pc/pci.c:12,45
1995/0517		static Lock pcicfglock;
1995/0725		static int pcicfgmode = -1; static void pcicfginit(int) { /* * Try to determine which PCI configuration mode is implemented. * Mode2 uses a byte at 0xCF8 and another at 0xCFA; Mode1 uses * a DWORD at 0xCF8 and another at 0xCFC and will pass through * any non-DWORD accesses as normal I/O cycles. There shouldn't be * a device behind theses addresses so if Mode2 accesses fail try * for Mode1 (which is preferred, Mode2 is deprecated). */ outb(PCIcse, 0); if(inb(PCIcse) == 0){ pcicfgmode = 2; return; } outl(PCIaddr, 0); if(inl(PCIaddr) == 0){ pcicfgmode = 1; return; } pcicfgmode = -1; }
1995/0517		/* * Read a chunk of PCI configuration space. * Assumes arguments are within limits and regno and
1995/0721/sys/src/9/pc/pci.c:16,37 – 1995/0725/sys/src/9/pc/pci.c:48,91
1995/0517		void
1995/0721		pcicfgr(int busno, int devno, int funcno, int regno, void* data, int nbytes)
1995/0517		{
1995/0721		ulong* p;
1995/0725		ulong addr, *p;
1995/0721		int base, len;
1995/0517		lock(&pcicfglock); outb(PCIcse, 0x80|((funcno & 0x07)<<1)); outb(PCIforward, busno);
1995/0725		if(pcicfgmode == -1) pcicfginit(busno);
1995/0517		base = (0xC000|(devno<<8)) + regno; p = data; for(len = nbytes/sizeof(ulong); len > 0; len--){ *p = inl(base); p++;
1995/0721		base += sizeof(*p);
1995/0725		switch(pcicfgmode){ case 1: addr = 0x80000000|((busno & 0xFF)<<16)|((devno & 0x1F)<<11)|((funcno & 0x03)<<8); p = data; for(len = nbytes/sizeof(ulong); len > 0; len--){ outl(PCIaddr, addr|(regno & 0xFF)); *p = inl(PCIdata); p++; regno += sizeof(ulong); } outl(PCIaddr, 0); break; case 2: outb(PCIcse, 0x80|((funcno & 0x07)<<1)); outb(PCIforward, busno); base = (0xC000|(devno<<8)) + regno; p = data; for(len = nbytes/sizeof(ulong); len > 0; len--){ *p = inl(base); p++; base += sizeof(*p); } outb(PCIcse, 0); break;
1995/0517		} outb(PCIcse, 0x00); unlock(&pcicfglock); }
1995/0721/sys/src/9/pc/pci.c:38,59 – 1995/0725/sys/src/9/pc/pci.c:92,134
1995/0721		void pcicfgw(int busno, int devno, int funcno, int regno, void* data, int nbytes) { ulong* p;
1995/0725		ulong addr, *p;
1995/0721		int base, len; lock(&pcicfglock); outb(PCIcse, 0x80|((funcno & 0x07)<<1)); outb(PCIforward, busno);
1995/0725		if(pcicfgmode == -1) pcicfginit(busno);
1995/0721		base = (0xC000|(devno<<8)) + regno; p = data; for(len = nbytes/sizeof(ulong); len > 0; len--){ outl(base, *p); p++; base += sizeof(*p);
1995/0725		switch(pcicfgmode){ case 1: addr = 0x80000000|((busno & 0xFF)<<16)|((devno & 0x1F)<<11)|((funcno & 0x03)<<8); p = data; for(len = nbytes/sizeof(ulong); len > 0; len--){ outl(PCIaddr, addr|(regno & 0xFF)); outl(PCIdata, *p); p++; regno += sizeof(ulong); } outl(PCIaddr, 0); break; case 2: outb(PCIcse, 0x80|((funcno & 0x07)<<1)); outb(PCIforward, busno); base = (0xC000|(devno<<8)) + regno; p = data; for(len = nbytes/sizeof(ulong); len > 0; len--){ outl(base, *p); p++; base += sizeof(*p); } outb(PCIcse, 0);
1995/0721		} outb(PCIcse, 0x00); unlock(&pcicfglock); }