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

• Lines: 272
• Date: Wed Dec 31 16:00:00 1969
• Orig file: linux-2.4.18/arch/ppc/boot/mbx/qspan_pci.c
• Orig date: Thu May 24 15:02:06 2001

diff -urN linux-2.4.18/arch/ppc/boot/mbx/qspan_pci.c linux-2.4.19/arch/ppc/boot/mbx/qspan_pci.c
@@ -1,271 +0,0 @@
-/*
- * BK Id: SCCS/s.qspan_pci.c 1.6 05/18/01 15:17:06 cort
- */
-/*
- * LinuxPPC arch/ppc/kernel/qspan_pci.c   Dan Malek (dmalek@jlc.net)
- *
- * QSpan Motorola bus to 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/types.h>
-#include <linux/kernel.h>
-#include <linux/pci.h>
-#include <asm/mpc8xx.h>
-
-/*
- * 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_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;
-
-/* Initialize the QSpan device registers after power up.
-*/
-qspan_init()
-{
-	uint	*qptr;
-
-
-
-	qptr = (uint *)PCI_CSR_ADDR;
-
-	/* PCI Configuration/status.  Upper bits written to clear
-	 * pending interrupt or status.  Lower bits enable QSPAN as
-	 * PCI master, enable memory and I/O cycles, and enable PCI
-	 * parity error checking.
-	 * IMPORTANT:  The last two bits of this word enable PCI
-	 * master cycles into the QBus.  The QSpan is broken and can't
-	 * meet the timing specs of the PQ bus for this to work.  Therefore,
-	 * if you don't have external bus arbitration, you can't use
-	 * this function.
-	 */
-#ifdef EXTERNAL_PQ_ARB
-	qptr[1] = 0xf9000147;
-#else
-	qptr[1] = 0xf9000144;
-#endif
-
-	/* PCI Misc configuration.  Set PCI latency timer resolution
-	 * of 8 cycles, set cache size to 4 x 32.
-	 */
-	qptr[3] = 0;
-
-	/* Set up PCI Target address mapping.  Enable, Posted writes,
-	 * 2Gbyte space (processor memory controller determines actual size).
-	 */
-	qptr[64] = 0x8f000080;
-
-	/* Map processor 0x80000000 to PCI 0x00000000.
-	 * Processor address bit 1 determines I/O type access (0x80000000)
-	 * or memory type access (0xc0000000).
-	 */
-	qptr[65] = 0x80000000;
-
-	/* Enable error logging and clear any pending error status.
-	*/
-	qptr[80] = 0x90000000;
-
-	qptr[512] = 0x000c0003;
-
-	/* Set up Qbus slave image.
-	*/
-	qptr[960] = 0x01000000;
-	qptr[961] = 0x000000d1;
-	qptr[964] = 0x00000000;
-	qptr[965] = 0x000000d1;
-
-}
-
-/* Functions to support PCI bios-like features to read/write configuration
- * space.  If the function fails for any reason, a -1 (0xffffffff) value
- * must be returned.
- */
-#define DEVICE_NOT_FOUND	(-1)
-#define SUCCESSFUL		0
-
-int qs_pci_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 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_pci_config(temp, QS_CONFIG_DATA, "lwz");
-
-	offset ^= 0x03;
-	cp = ((u_char *)&temp) + (offset & 0x03);
-	*val = *cp;
-	return SUCCESSFUL;
-}
-
-int qs_pci_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 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_pci_config(temp, QS_CONFIG_DATA, "lwz");
-	offset ^= 0x02;
-
-	sp = ((ushort *)&temp) + ((offset >> 1) & 1);
-	*val = *sp;
-	return SUCCESSFUL;
-}
-
-int qs_pci_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 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_pci_config(*val, QS_CONFIG_DATA, "lwz");
-	return SUCCESSFUL;
-}
-
-int qs_pci_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 DEVICE_NOT_FOUND;
-
-	qs_pci_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 SUCCESSFUL;
-}
-
-int qs_pci_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 DEVICE_NOT_FOUND;
-
-	qs_pci_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 SUCCESSFUL;
-}
-
-int qs_pci_write_config_dword(unsigned char bus, unsigned char dev_fn,
-				    unsigned char offset, unsigned int val)
-{
-	if ((bus > 7) || (dev_fn > 127))
-		return 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 SUCCESSFUL;
-}
-