patch-2.4.19 linux-2.4.19/arch/ppc/boot/mbx/pci.c

• Lines: 256
• Date: Wed Dec 31 16:00:00 1969
• Orig file: linux-2.4.18/arch/ppc/boot/mbx/pci.c
• Orig date: Thu May 24 15:02:06 2001

diff -urN linux-2.4.18/arch/ppc/boot/mbx/pci.c linux-2.4.19/arch/ppc/boot/mbx/pci.c
@@ -1,255 +0,0 @@
-/*
- * BK Id: SCCS/s.pci.c 1.6 05/18/01 15:17:06 cort
- */
-/* Stand alone funtions for QSpan Tundra support.
- */
-#include <linux/types.h>
-#include <linux/kernel.h>
-#include <linux/pci.h>
-#include <asm/mpc8xx.h>
-
-/* To map PCI devices, you first write 0xffffffff into the device
- * base address registers.  When the register is read back, the
- * number of most significant '1' bits describes the amount of address
- * space needed for mapping.  If the most significant bit is not set,
- * either the device does not use that address register, or it has
- * a fixed address that we can't change.  After the address is assigned,
- * the command register has to be written to enable the card.
- */
-typedef struct {
-	u_char	pci_bus;
-	u_char	pci_devfn;
-	ushort	pci_command;
-	uint	pci_addrs[6];
-} pci_map_t;
-
-/* We should probably dynamically allocate these structures.
-*/
-#define MAX_PCI_DEVS	32
-int	pci_dev_cnt;
-pci_map_t	pci_map[MAX_PCI_DEVS];
-
-void pci_conf_write(int bus, int device, int func, int reg, uint writeval);
-void pci_conf_read(int bus, int device, int func, int reg, void *readval);
-void probe_addresses(int bus, int devfn);
-void map_pci_addrs(void);
-
-/* This is a really stripped version of PCI bus scan.  All we are
- * looking for are devices that exist.
- */
-pci_scanner(int addr_probe)
-{
-	unsigned int devfn, l, max, class, bus_number;
-	unsigned char cmd, irq, tmp, hdr_type, is_multi;
-	int reg;
-
-	is_multi = 0;
-	bus_number = 0;
-	for (devfn = 0; devfn < 0xff; ++devfn) {
-		/* The device numbers are comprised of upper 5 bits of
-		 * device number and lower 3 bits of multi-function number.
-		 */
-		if ((devfn & 7) && !is_multi) {
-			/* Don't scan multifunction addresses if this is
-			 * not a multifunction device.
-			 */
-			continue;
-		}
-
-		/* Read the header to determine card type.
-		*/
-		qs_pci_read_config_byte(bus_number, devfn, PCI_HEADER_TYPE,
-								&hdr_type);
-
-		/* If this is a base device number, check the header to
-		 * determine if it is mulifunction.
-		 */
-		if ((devfn & 7) == 0)
-			is_multi = hdr_type & 0x80;
-
-		/* Check to see if the board is really in the slot.
-		*/
-		qs_pci_read_config_dword(bus_number, devfn, PCI_VENDOR_ID, &l);
-		/* some broken boards return 0 if a slot is empty: */
-		if (l == 0xffffffff || l == 0x00000000 || l == 0x0000ffff ||
-							l == 0xffff0000) {
-			/* Nothing there.
-			*/
-			is_multi = 0;
-			continue;
-		}
-
-		/* If we are not performing an address probe,
-		 * just simply print out some information.
-		 */
-		if (!addr_probe) {
-			qs_pci_read_config_dword(bus_number, devfn,
-						PCI_CLASS_REVISION, &class);
-
-			class >>= 8;	    /* upper 3 bytes */
-
-#if 0
-			printf("Found (%3d:%d): vendor 0x%04x, device 0x%04x, class 0x%06x\n",
-				(devfn >> 3), (devfn & 7),
-				(l & 0xffff),  (l >> 16) & 0xffff, class);
-#else
-			puts("Found ("); puthex(devfn >> 3);
-			puts(":"); puthex(devfn & 7);
-			puts("): vendor "); puthex(l & 0xffff);
-			puts(", device "); puthex((l >> 16) & 0xffff);
-			puts(", class "); puthex(class); puts("\n");
-#endif
-		}
-		else {
-			/* If this is a "normal" device, build address list.
-			*/
-			if ((hdr_type & 0x7f) == PCI_HEADER_TYPE_NORMAL)
-				probe_addresses(bus_number, devfn);
-		}
-	}
-
-	/* Now map the boards.
-	*/
-	if (addr_probe)
-		map_pci_addrs();
-}
-
-/* Probe addresses for the specified device.  This is a destructive
- * operation because it writes the registers.
- */
-void
-probe_addresses(bus, devfn)
-{
-	int	i;
-	uint	pciaddr;
-	ushort	pcicmd;
-	pci_map_t	*pm;
-
-	if (pci_dev_cnt >= MAX_PCI_DEVS) {
-		puts("Too many PCI devices\n");
-		return;
-	}
-
-	pm = &pci_map[pci_dev_cnt++];
-
-	pm->pci_bus = bus;
-	pm->pci_devfn = devfn;
-
-	for (i=0; i<6; i++) {
-		qs_pci_write_config_dword(bus, devfn, PCI_BASE_ADDRESS_0 + (i * 4), -1);
-		qs_pci_read_config_dword(bus, devfn, PCI_BASE_ADDRESS_0 + (i * 4),
-								&pciaddr);
-		pm->pci_addrs[i] = pciaddr;
-		qs_pci_read_config_word(bus, devfn, PCI_COMMAND, &pcicmd);
-		pm->pci_command = pcicmd;
-	}
-}
-
-/* Map the cards into the PCI space.  The PCI has separate memory
- * and I/O spaces.  In addition, some memory devices require mapping
- * below 1M.  The least significant 4 bits of the address register
- * provide information.  If this is an I/O device, only the LS bit
- * is used to indicate that, so I/O devices can be mapped to a two byte
- * boundard.  Memory addresses can be mapped to a 32 byte boundary.
- * The QSpan implementations usually have a 1Gbyte space for each
- * memory and I/O spaces.
- *
- * This isn't a terribly fancy algorithm.  I just map the spaces from
- * the top starting with the largest address space.  When finished,
- * the registers are written and the card enabled.
- *
- * While the Tundra can map a large address space on most boards, we
- * need to be careful because it may overlap other devices (like IMMR).
- */
-#define MEMORY_SPACE_SIZE	0x20000000
-#define IO_SPACE_SIZE		0x20000000
-
-void
-map_pci_addrs()
-{
-	uint	pci_mem_top, pci_mem_low;
-	uint	pci_io_top;
-	uint	addr_mask, reg_addr, space;
-	int	i, j;
-	pci_map_t *pm;
-
-	pci_mem_top = MEMORY_SPACE_SIZE;
-	pci_io_top = IO_SPACE_SIZE;
-	pci_mem_low = (1 * 1024 * 1024);	/* Below one meg addresses */
-
-	/* We can't map anything more than the maximum space, but test
-	 * for it anyway to catch devices out of range.
-	 */
-	addr_mask = 0x80000000;
-
-	do {
-		space = (~addr_mask) + 1;	/* Size of the space */
-		for (i=0; i<pci_dev_cnt; i++) {
-			pm = &pci_map[i];
-			for (j=0; j<6; j++) {
-				/* If the MS bit is not set, this has either
-				 * already been mapped, or is not used.
-				 */
-				reg_addr = pm->pci_addrs[j];
-				if ((reg_addr & 0x80000000) == 0)
-					continue;
-				if (reg_addr & PCI_BASE_ADDRESS_SPACE_IO) {
-					if ((reg_addr & PCI_BASE_ADDRESS_IO_MASK) != addr_mask)
-						continue;
-					if (pci_io_top < space) {
-						puts("Out of PCI I/O space\n");
-					}
-					else {
-						pci_io_top -= space;
-						pm->pci_addrs[j] = pci_io_top;
-						pm->pci_command |= PCI_COMMAND_IO;
-					}
-				}
-				else {
-					if ((reg_addr & PCI_BASE_ADDRESS_MEM_MASK) != addr_mask)
-						continue;
-
-					/* Memory space.  Test if below 1M.
-					*/
-					if (reg_addr & PCI_BASE_ADDRESS_MEM_TYPE_1M) {
-						if (pci_mem_low < space) {
-							puts("Out of PCI 1M space\n");
-						}
-						else {
-							pci_mem_low -= space;
-							pm->pci_addrs[j] = pci_mem_low;
-						}
-					}
-					else {
-						if (pci_mem_top < space) {
-							puts("Out of PCI Mem space\n");
-						}
-						else {
-							pci_mem_top -= space;
-							pm->pci_addrs[j] = pci_mem_top;
-						}
-					}
-					pm->pci_command |= PCI_COMMAND_MEMORY;
-				}
-			}
-		}
-		addr_mask >>= 1;
-		addr_mask |= 0x80000000;
-	} while (addr_mask != 0xfffffffe);
-	
-	/* Now, run the list one more time and map everything.
-	*/
-	for (i=0; i<pci_dev_cnt; i++) {
-		pm = &pci_map[i];
-		for (j=0; j<6; j++) {
-			qs_pci_write_config_dword(pm->pci_bus, pm->pci_devfn,
-				PCI_BASE_ADDRESS_0 + (j * 4), pm->pci_addrs[j]);
-		}
-
-		/* Enable memory or address mapping.
-		*/
-		qs_pci_write_config_word(pm->pci_bus, pm->pci_devfn, PCI_COMMAND,
-			pm->pci_command);
-	}
-}
-