patch-2.3.35 linux/arch/ppc/kernel/mbx_pci.c

• Lines: 270
• Date: Wed Dec 31 16:00:00 1969
• Orig file: v2.3.34/linux/arch/ppc/kernel/mbx_pci.c
• Orig date: Tue Aug 31 17:29:13 1999

diff -u --recursive --new-file v2.3.34/linux/arch/ppc/kernel/mbx_pci.c linux/arch/ppc/kernel/mbx_pci.c
@@ -1,269 +0,0 @@
-/*
- * MBX pci routines.
- * The MBX uses the QSpan PCI bridge.  The config address register
- * is located 0x500 from the base of the bridge control/status registers.
- * The data register is located at 0x504.
- * This is a two step operation.  First, the address register is written,
- * then the data register is read/written as required.
- * I don't know what to do about interrupts (yet).
- */
-
-#include <linux/kernel.h>
-#include <linux/pci.h>
-#include <linux/bios32.h>
-#include <linux/delay.h>
-#include <linux/string.h>
-#include <linux/init.h>
-
-#include <asm/io.h>
-#include <asm/mbx.h>
-
-
-/*
- * This blows......The MBX uses the Tundra QSpan PCI bridge.  When
- * reading the configuration space, if something does not respond
- * the bus times out and we get a machine check interrupt.  So, the
- * good ol' exception tables come to mind to trap it and return some
- * value.
- *
- * On an error we just return a -1, since that is what the caller wants
- * returned if nothing is present.  I copied this from __get_user_asm,
- * with the only difference of returning -1 instead of EFAULT.
- * There is an associated hack in the machine check trap code.
- *
- * The QSPAN is also a big endian device, that is it makes the PCI
- * look big endian to us.  This presents a problem for the Linux PCI
- * functions, which assume little endian.  For example, we see the
- * first 32-bit word like this:
- *	------------------------
- *	| Device ID | Vendor ID |
- *	------------------------
- * If we read/write as a double word, that's OK.  But in our world,
- * when read as a word, device ID is at location 0, not location 2 as
- * the little endian PCI would believe.  We have to switch bits in
- * the PCI addresses given to us to get the data to/from the correct
- * byte lanes.
- *
- * The QSPAN only supports 4 bits of "slot" in the dev_fn instead of 5.
- * It always forces the MS bit to zero.  Therefore, dev_fn values
- * greater than 128 are returned as "no device found" errors.
- *
- * The QSPAN can only perform long word (32-bit) configuration cycles.
- * The "offset" must have the two LS bits set to zero.  Read operations
- * require we read the entire word and then sort out what should be
- * returned.  Write operations other than long word require that we
- * read the long word, update the proper word or byte, then write the
- * entire long word back.
- *
- * PCI Bridge hack.  We assume (correctly) that bus 0 is the primary
- * PCI bus from the QSPAN.  If we are called with a bus number other
- * than zero, we create a Type 1 configuration access that a downstream
- * PCI bridge will interpret.
- */
-
-#define __get_mbx_pci_config(x, addr, op)		\
-	__asm__ __volatile__(				\
-		"1:	"op" %0,0(%1)\n"		\
-		"	eieio\n"			\
-		"2:\n"					\
-		".section .fixup,\"ax\"\n"		\
-		"3:	li %0,-1\n"			\
-		"	b 2b\n"				\
-		".section __ex_table,\"a\"\n"		\
-		"	.align 2\n"			\
-		"	.long 1b,3b\n"			\
-		".text"					\
-		: "=r"(x) : "r"(addr))
-
-#define QS_CONFIG_ADDR	((volatile uint *)(PCI_CSR_ADDR + 0x500))
-#define QS_CONFIG_DATA	((volatile uint *)(PCI_CSR_ADDR + 0x504))
-
-#define mk_config_addr(bus, dev, offset) \
-	(((bus)<<16) | ((dev)<<8) | (offset & 0xfc))
-
-#define mk_config_type1(bus, dev, offset) \
-	mk_config_addr(bus, dev, offset) | 1;
-
-int mbx_pcibios_read_config_byte(unsigned char bus, unsigned char dev_fn,
-				  unsigned char offset, unsigned char *val)
-{
-	uint	temp;
-	u_char	*cp;
-
-	if ((bus > 7) || (dev_fn > 127)) {
-		*val = 0xff;
-		return PCIBIOS_DEVICE_NOT_FOUND;
-	}
-
-	if (bus == 0)
-		*QS_CONFIG_ADDR = mk_config_addr(bus, dev_fn, offset);
-	else
-		*QS_CONFIG_ADDR = mk_config_type1(bus, dev_fn, offset);
-	__get_mbx_pci_config(temp, QS_CONFIG_DATA, "lwz");
-
-	offset ^= 0x03;
-	cp = ((u_char *)&temp) + (offset & 0x03);
-	*val = *cp;
-	return PCIBIOS_SUCCESSFUL;
-}
-
-int mbx_pcibios_read_config_word(unsigned char bus, unsigned char dev_fn,
-				  unsigned char offset, unsigned short *val)
-{
-	uint	temp;
-	ushort	*sp;
-
-	if ((bus > 7) || (dev_fn > 127)) {
-		*val = 0xffff;
-		return PCIBIOS_DEVICE_NOT_FOUND;
-	}
-
-	if (bus == 0)
-		*QS_CONFIG_ADDR = mk_config_addr(bus, dev_fn, offset);
-	else
-		*QS_CONFIG_ADDR = mk_config_type1(bus, dev_fn, offset);
-	__get_mbx_pci_config(temp, QS_CONFIG_DATA, "lwz");
-	offset ^= 0x02;
-
-	sp = ((ushort *)&temp) + ((offset >> 1) & 1);
-	*val = *sp;
-	return PCIBIOS_SUCCESSFUL;
-}
-
-int mbx_pcibios_read_config_dword(unsigned char bus, unsigned char dev_fn,
-				   unsigned char offset, unsigned int *val)
-{
-	if ((bus > 7) || (dev_fn > 127)) {
-		*val = 0xffffffff;
-		return PCIBIOS_DEVICE_NOT_FOUND;
-	}
-	if (bus == 0)
-		*QS_CONFIG_ADDR = mk_config_addr(bus, dev_fn, offset);
-	else
-		*QS_CONFIG_ADDR = mk_config_type1(bus, dev_fn, offset);
-	__get_mbx_pci_config(*val, QS_CONFIG_DATA, "lwz");
-	return PCIBIOS_SUCCESSFUL;
-}
-
-int mbx_pcibios_write_config_byte(unsigned char bus, unsigned char dev_fn,
-				   unsigned char offset, unsigned char val)
-{
-	uint	temp;
-	u_char	*cp;
-
-	if ((bus > 7) || (dev_fn > 127))
-		return PCIBIOS_DEVICE_NOT_FOUND;
-
-	mbx_pcibios_read_config_dword(bus, dev_fn, offset, &temp);
-
-	offset ^= 0x03;
-	cp = ((u_char *)&temp) + (offset & 0x03);
-	*cp = val;
-
-	if (bus == 0)
-		*QS_CONFIG_ADDR = mk_config_addr(bus, dev_fn, offset);
-	else
-		*QS_CONFIG_ADDR = mk_config_type1(bus, dev_fn, offset);
-	*QS_CONFIG_DATA = temp;
-
-	return PCIBIOS_SUCCESSFUL;
-}
-
-int mbx_pcibios_write_config_word(unsigned char bus, unsigned char dev_fn,
-				   unsigned char offset, unsigned short val)
-{
-	uint	temp;
-	ushort	*sp;
-
-	if ((bus > 7) || (dev_fn > 127))
-		return PCIBIOS_DEVICE_NOT_FOUND;
-
-	mbx_pcibios_read_config_dword(bus, dev_fn, offset, &temp);
-
-	offset ^= 0x02;
-	sp = ((ushort *)&temp) + ((offset >> 1) & 1);
-	*sp = val;
-
-	if (bus == 0)
-		*QS_CONFIG_ADDR = mk_config_addr(bus, dev_fn, offset);
-	else
-		*QS_CONFIG_ADDR = mk_config_type1(bus, dev_fn, offset);
-	*QS_CONFIG_DATA = temp;
-
-	return PCIBIOS_SUCCESSFUL;
-}
-
-int mbx_pcibios_write_config_dword(unsigned char bus, unsigned char dev_fn,
-				    unsigned char offset, unsigned int val)
-{
-	if ((bus > 7) || (dev_fn > 127))
-		return PCIBIOS_DEVICE_NOT_FOUND;
-
-	if (bus == 0)
-		*QS_CONFIG_ADDR = mk_config_addr(bus, dev_fn, offset);
-	else
-		*QS_CONFIG_ADDR = mk_config_type1(bus, dev_fn, offset);
-	*(unsigned int *)QS_CONFIG_DATA = val;
-
-	return PCIBIOS_SUCCESSFUL;
-}
-
-int mbx_pcibios_find_device(unsigned short vendor, unsigned short dev_id,
-			     unsigned short index, unsigned char *bus_ptr,
-			     unsigned char *dev_fn_ptr)
-{
-    int num, devfn;
-    unsigned int x, vendev;
-
-    if (vendor == 0xffff)
-	return PCIBIOS_BAD_VENDOR_ID;
-    vendev = (dev_id << 16) + vendor;
-    num = 0;
-    for (devfn = 0;  devfn < 32;  devfn++) {
-	mbx_pcibios_read_config_dword(0, devfn<<3, PCI_VENDOR_ID, &x);
-	if (x == vendev) {
-	    if (index == num) {
-		*bus_ptr = 0;
-		*dev_fn_ptr = devfn<<3;
-		return PCIBIOS_SUCCESSFUL;
-	    }
-	    ++num;
-	}
-    }
-    return PCIBIOS_DEVICE_NOT_FOUND;
-}
-
-int mbx_pcibios_find_class(unsigned int class_code, unsigned short index,
-			    unsigned char *bus_ptr, unsigned char *dev_fn_ptr)
-{
-    int devnr, x, num;
-
-    num = 0;
-    for (devnr = 0;  devnr < 32;  devnr++) {
-	mbx_pcibios_read_config_dword(0, devnr<<3, PCI_CLASS_REVISION, &x);
-	if ((x>>8) == class_code) {
-	    if (index == num) {
-		*bus_ptr = 0;
-		*dev_fn_ptr = devnr<<3;
-		return PCIBIOS_SUCCESSFUL;
-	    }
-	    ++num;
-	}
-    }
-    return PCIBIOS_DEVICE_NOT_FOUND;
-}
-
-void __init
-mbx_pcibios_fixup(void)
-{
-   /* Nothing to do here? */
-}
-
-void __init
-mbx_setup_pci_ptrs(void)
-{
-	set_config_access_method(mbx);
-
-	ppc_md.pcibios_fixup = mbx_pcibios_fixup;
-}
-