+++ /dev/null
-/*
- * QSpan pci routines.
- * Most 8xx boards use 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).
- *
- * The RPX Classic implementation shares a chip select for normal
- * PCI access and QSpan control register addresses. The selection is
- * further selected by a bit setting in a board control register.
- * Although it should happen, we disable interrupts during this operation
- * to make sure some driver doesn't accidentally access the PCI while
- * we have switched the chip select.
- */
-
-#include <linux/kernel.h>
-#include <linux/pci.h>
-#include <linux/delay.h>
-#include <linux/string.h>
-#include <linux/init.h>
-
-#include <asm/io.h>
-#include <asm/mpc8xx.h>
-#include <asm/system.h>
-#include <asm/machdep.h>
-#include <asm/pci-bridge.h>
-
-
-/*
- * This blows......
- * 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_qspan_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) : " %0")
-
-#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;
-
-static DEFINE_SPINLOCK(pcibios_lock);
-
-int qspan_pcibios_read_config_byte(unsigned char bus, unsigned char dev_fn,
- unsigned char offset, unsigned char *val)
-{
- uint temp;
- u_char *cp;
-#ifdef CONFIG_RPXCLASSIC
- unsigned long flags;
-#endif
-
- if ((bus > 7) || (dev_fn > 127)) {
- *val = 0xff;
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
-
-#ifdef CONFIG_RPXCLASSIC
- /* disable interrupts */
- spin_lock_irqsave(&pcibios_lock, flags);
- *((uint *)RPX_CSR_ADDR) &= ~BCSR2_QSPACESEL;
- eieio();
-#endif
-
- 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_qspan_pci_config(temp, QS_CONFIG_DATA, "lwz");
-
-#ifdef CONFIG_RPXCLASSIC
- *((uint *)RPX_CSR_ADDR) |= BCSR2_QSPACESEL;
- eieio();
- spin_unlock_irqrestore(&pcibios_lock, flags);
-#endif
-
- offset ^= 0x03;
- cp = ((u_char *)&temp) + (offset & 0x03);
- *val = *cp;
- return PCIBIOS_SUCCESSFUL;
-}
-
-int qspan_pcibios_read_config_word(unsigned char bus, unsigned char dev_fn,
- unsigned char offset, unsigned short *val)
-{
- uint temp;
- ushort *sp;
-#ifdef CONFIG_RPXCLASSIC
- unsigned long flags;
-#endif
-
- if ((bus > 7) || (dev_fn > 127)) {
- *val = 0xffff;
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
-
-#ifdef CONFIG_RPXCLASSIC
- /* disable interrupts */
- spin_lock_irqsave(&pcibios_lock, flags);
- *((uint *)RPX_CSR_ADDR) &= ~BCSR2_QSPACESEL;
- eieio();
-#endif
-
- 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_qspan_pci_config(temp, QS_CONFIG_DATA, "lwz");
- offset ^= 0x02;
-
-#ifdef CONFIG_RPXCLASSIC
- *((uint *)RPX_CSR_ADDR) |= BCSR2_QSPACESEL;
- eieio();
- spin_unlock_irqrestore(&pcibios_lock, flags);
-#endif
-
- sp = ((ushort *)&temp) + ((offset >> 1) & 1);
- *val = *sp;
- return PCIBIOS_SUCCESSFUL;
-}
-
-int qspan_pcibios_read_config_dword(unsigned char bus, unsigned char dev_fn,
- unsigned char offset, unsigned int *val)
-{
-#ifdef CONFIG_RPXCLASSIC
- unsigned long flags;
-#endif
-
- if ((bus > 7) || (dev_fn > 127)) {
- *val = 0xffffffff;
- return PCIBIOS_DEVICE_NOT_FOUND;
- }
-
-#ifdef CONFIG_RPXCLASSIC
- /* disable interrupts */
- spin_lock_irqsave(&pcibios_lock, flags);
- *((uint *)RPX_CSR_ADDR) &= ~BCSR2_QSPACESEL;
- eieio();
-#endif
-
- 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_qspan_pci_config(*val, QS_CONFIG_DATA, "lwz");
-
-#ifdef CONFIG_RPXCLASSIC
- *((uint *)RPX_CSR_ADDR) |= BCSR2_QSPACESEL;
- eieio();
- spin_unlock_irqrestore(&pcibios_lock, flags);
-#endif
-
- return PCIBIOS_SUCCESSFUL;
-}
-
-int qspan_pcibios_write_config_byte(unsigned char bus, unsigned char dev_fn,
- unsigned char offset, unsigned char val)
-{
- uint temp;
- u_char *cp;
-#ifdef CONFIG_RPXCLASSIC
- unsigned long flags;
-#endif
-
- if ((bus > 7) || (dev_fn > 127))
- return PCIBIOS_DEVICE_NOT_FOUND;
-
- qspan_pcibios_read_config_dword(bus, dev_fn, offset, &temp);
-
- offset ^= 0x03;
- cp = ((u_char *)&temp) + (offset & 0x03);
- *cp = val;
-
-#ifdef CONFIG_RPXCLASSIC
- /* disable interrupts */
- spin_lock_irqsave(&pcibios_lock, flags);
- *((uint *)RPX_CSR_ADDR) &= ~BCSR2_QSPACESEL;
- eieio();
-#endif
-
- 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;
-
-#ifdef CONFIG_RPXCLASSIC
- *((uint *)RPX_CSR_ADDR) |= BCSR2_QSPACESEL;
- eieio();
- spin_unlock_irqrestore(&pcibios_lock, flags);
-#endif
-
- return PCIBIOS_SUCCESSFUL;
-}
-
-int qspan_pcibios_write_config_word(unsigned char bus, unsigned char dev_fn,
- unsigned char offset, unsigned short val)
-{
- uint temp;
- ushort *sp;
-#ifdef CONFIG_RPXCLASSIC
- unsigned long flags;
-#endif
-
- if ((bus > 7) || (dev_fn > 127))
- return PCIBIOS_DEVICE_NOT_FOUND;
-
- qspan_pcibios_read_config_dword(bus, dev_fn, offset, &temp);
-
- offset ^= 0x02;
- sp = ((ushort *)&temp) + ((offset >> 1) & 1);
- *sp = val;
-
-#ifdef CONFIG_RPXCLASSIC
- /* disable interrupts */
- spin_lock_irqsave(&pcibios_lock, flags);
- *((uint *)RPX_CSR_ADDR) &= ~BCSR2_QSPACESEL;
- eieio();
-#endif
-
- 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;
-
-#ifdef CONFIG_RPXCLASSIC
- *((uint *)RPX_CSR_ADDR) |= BCSR2_QSPACESEL;
- eieio();
- spin_unlock_irqrestore(&pcibios_lock, flags);
-#endif
-
- return PCIBIOS_SUCCESSFUL;
-}
-
-int qspan_pcibios_write_config_dword(unsigned char bus, unsigned char dev_fn,
- unsigned char offset, unsigned int val)
-{
-#ifdef CONFIG_RPXCLASSIC
- unsigned long flags;
-#endif
-
- if ((bus > 7) || (dev_fn > 127))
- return PCIBIOS_DEVICE_NOT_FOUND;
-
-#ifdef CONFIG_RPXCLASSIC
- /* disable interrupts */
- spin_lock_irqsave(&pcibios_lock, flags);
- *((uint *)RPX_CSR_ADDR) &= ~BCSR2_QSPACESEL;
- eieio();
-#endif
-
- 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;
-
-#ifdef CONFIG_RPXCLASSIC
- *((uint *)RPX_CSR_ADDR) |= BCSR2_QSPACESEL;
- eieio();
- spin_unlock_irqrestore(&pcibios_lock, flags);
-#endif
-
- return PCIBIOS_SUCCESSFUL;
-}
-
-int qspan_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++) {
- qspan_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 qspan_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++) {
- qspan_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
-m8xx_pcibios_fixup(void)
-{
- /* Lots to do here, all board and configuration specific. */
-}
-
-void __init
-m8xx_setup_pci_ptrs(void)
-{
- set_config_access_method(qspan);
-
- ppc_md.pcibios_fixup = m8xx_pcibios_fixup;
-}
-
git.samba.org / sfrench / cifs-2.6.git / blobdiff