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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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fc103349bb
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
198 lines
4.4 KiB
C
198 lines
4.4 KiB
C
/*
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* Define the pci_ops for the Toshiba rbtx4938
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* Copyright (C) 2000-2001 Toshiba Corporation
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*
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* 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the
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* terms of the GNU General Public License version 2. This program is
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* licensed "as is" without any warranty of any kind, whether express
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* or implied.
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*
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* Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com)
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*/
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <asm/addrspace.h>
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#include <asm/tx4938/rbtx4938.h>
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/* initialize in setup */
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struct resource pci_io_resource = {
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.name = "pci IO space",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_IO
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};
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/* initialize in setup */
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struct resource pci_mem_resource = {
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.name = "pci memory space",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_MEM
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};
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struct resource tx4938_pcic1_pci_io_resource = {
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.name = "PCI1 IO",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_IO
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};
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struct resource tx4938_pcic1_pci_mem_resource = {
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.name = "PCI1 mem",
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.start = 0,
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.end = 0,
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.flags = IORESOURCE_MEM
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};
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static int mkaddr(int bus, int dev_fn, int where, int *flagsp)
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{
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if (bus > 0) {
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/* Type 1 configuration */
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tx4938_pcicptr->g2pcfgadrs = ((bus & 0xff) << 0x10) |
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((dev_fn & 0xff) << 0x08) | (where & 0xfc) | 1;
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} else {
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if (dev_fn >= PCI_DEVFN(TX4938_PCIC_MAX_DEVNU, 0))
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return -1;
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/* Type 0 configuration */
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tx4938_pcicptr->g2pcfgadrs = ((bus & 0xff) << 0x10) |
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((dev_fn & 0xff) << 0x08) | (where & 0xfc);
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}
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/* clear M_ABORT and Disable M_ABORT Int. */
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tx4938_pcicptr->pcistatus =
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(tx4938_pcicptr->pcistatus & 0x0000ffff) |
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(PCI_STATUS_REC_MASTER_ABORT << 16);
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tx4938_pcicptr->pcimask &= ~PCI_STATUS_REC_MASTER_ABORT;
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return 0;
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}
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static int check_abort(int flags)
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{
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int code = PCIBIOS_SUCCESSFUL;
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/* wait write cycle completion before checking error status */
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while (tx4938_pcicptr->pcicstatus & TX4938_PCIC_PCICSTATUS_IWB)
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;
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if (tx4938_pcicptr->pcistatus & (PCI_STATUS_REC_MASTER_ABORT << 16)) {
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tx4938_pcicptr->pcistatus =
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(tx4938_pcicptr->
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pcistatus & 0x0000ffff) | (PCI_STATUS_REC_MASTER_ABORT
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<< 16);
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tx4938_pcicptr->pcimask |= PCI_STATUS_REC_MASTER_ABORT;
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code = PCIBIOS_DEVICE_NOT_FOUND;
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}
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return code;
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}
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static int tx4938_pcibios_read_config(struct pci_bus *bus, unsigned int devfn,
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int where, int size, u32 * val)
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{
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int flags, retval, dev, busno, func;
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dev = PCI_SLOT(devfn);
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func = PCI_FUNC(devfn);
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/* check if the bus is top-level */
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if (bus->parent != NULL)
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busno = bus->number;
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else {
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busno = 0;
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}
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if (mkaddr(busno, devfn, where, &flags))
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return -1;
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switch (size) {
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case 1:
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*val = *(volatile u8 *) ((unsigned long) & tx4938_pcicptr->g2pcfgdata |
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#ifdef __BIG_ENDIAN
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((where & 3) ^ 3));
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#else
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(where & 3));
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#endif
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break;
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case 2:
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*val = *(volatile u16 *) ((unsigned long) & tx4938_pcicptr->g2pcfgdata |
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#ifdef __BIG_ENDIAN
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((where & 3) ^ 2));
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#else
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(where & 3));
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#endif
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break;
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case 4:
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*val = tx4938_pcicptr->g2pcfgdata;
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break;
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}
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retval = check_abort(flags);
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if (retval == PCIBIOS_DEVICE_NOT_FOUND)
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*val = 0xffffffff;
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return retval;
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}
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static int tx4938_pcibios_write_config(struct pci_bus *bus, unsigned int devfn, int where,
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int size, u32 val)
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{
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int flags, dev, busno, func;
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busno = bus->number;
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dev = PCI_SLOT(devfn);
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func = PCI_FUNC(devfn);
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/* check if the bus is top-level */
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if (bus->parent != NULL) {
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busno = bus->number;
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} else {
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busno = 0;
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}
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if (mkaddr(busno, devfn, where, &flags))
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return -1;
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switch (size) {
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case 1:
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*(volatile u8 *) ((unsigned long) & tx4938_pcicptr->g2pcfgdata |
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#ifdef __BIG_ENDIAN
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((where & 3) ^ 3)) = val;
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#else
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(where & 3)) = val;
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#endif
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break;
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case 2:
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*(volatile u16 *) ((unsigned long) & tx4938_pcicptr->g2pcfgdata |
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#ifdef __BIG_ENDIAN
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((where & 0x3) ^ 0x2)) = val;
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#else
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(where & 3)) = val;
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#endif
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break;
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case 4:
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tx4938_pcicptr->g2pcfgdata = val;
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break;
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}
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return check_abort(flags);
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}
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struct pci_ops tx4938_pci_ops = {
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tx4938_pcibios_read_config,
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tx4938_pcibios_write_config
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};
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struct pci_controller tx4938_pci_controller[] = {
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/* h/w only supports devices 0x00 to 0x14 */
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{
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.pci_ops = &tx4938_pci_ops,
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.io_resource = &pci_io_resource,
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.mem_resource = &pci_mem_resource,
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},
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/* h/w only supports devices 0x00 to 0x14 */
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{
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.pci_ops = &tx4938_pci_ops,
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.io_resource = &tx4938_pcic1_pci_io_resource,
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.mem_resource = &tx4938_pcic1_pci_mem_resource,
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}
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};
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