diff options
Diffstat (limited to 'arch/mips/pci/ops-tx4927.c')
| -rw-r--r-- | arch/mips/pci/ops-tx4927.c | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/arch/mips/pci/ops-tx4927.c b/arch/mips/pci/ops-tx4927.c new file mode 100644 index 000000000000..2a9d7227fe87 --- /dev/null +++ b/arch/mips/pci/ops-tx4927.c @@ -0,0 +1,209 @@ +/* + * Copyright 2001 MontaVista Software Inc. + * Author: MontaVista Software, Inc. + * ahennessy@mvista.com + * + * Copyright (C) 2000-2001 Toshiba Corporation + * Copyright (C) 2004 by Ralf Baechle (ralf@linux-mips.org) + * + * Based on arch/mips/ddb5xxx/ddb5477/pci_ops.c + * + * Define the pci_ops for the Toshiba rbtx4927 + * + * Much of the code is derived from the original DDB5074 port by + * Geert Uytterhoeven <geert@sonycom.com> + * + * Copyright 2004 MontaVista Software Inc. + * Author: Manish Lachwani (mlachwani@mvista.com) + * + * This program is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License as published by the + * Free Software Foundation; either version 2 of the License, or (at your + * option) any later version. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN + * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF + * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 675 Mass Ave, Cambridge, MA 02139, USA. + */ +#include <linux/types.h> +#include <linux/pci.h> +#include <linux/kernel.h> +#include <linux/init.h> + +#include <asm/addrspace.h> +#include <asm/byteorder.h> +#include <asm/tx4927/tx4927_pci.h> + +/* initialize in setup */ +struct resource pci_io_resource = { + .name = "TX4927 PCI IO SPACE", + .start = 0x1000, + .end = (0x1000 + (TX4927_PCIIO_SIZE)) - 1, + .flags = IORESOURCE_IO +}; + +/* initialize in setup */ +struct resource pci_mem_resource = { + .name = "TX4927 PCI MEM SPACE", + .start = TX4927_PCIMEM, + .end = TX4927_PCIMEM + TX4927_PCIMEM_SIZE - 1, + .flags = IORESOURCE_MEM +}; + +static int mkaddr(int bus, int dev_fn, int where, int *flagsp) +{ + if (bus > 0) { + /* Type 1 configuration */ + tx4927_pcicptr->g2pcfgadrs = ((bus & 0xff) << 0x10) | + ((dev_fn & 0xff) << 0x08) | (where & 0xfc) | 1; + } else { + if (dev_fn >= PCI_DEVFN(TX4927_PCIC_MAX_DEVNU, 0)) + return -1; + + /* Type 0 configuration */ + tx4927_pcicptr->g2pcfgadrs = ((bus & 0xff) << 0x10) | + ((dev_fn & 0xff) << 0x08) | (where & 0xfc); + } + /* clear M_ABORT and Disable M_ABORT Int. */ + tx4927_pcicptr->pcistatus = + (tx4927_pcicptr->pcistatus & 0x0000ffff) | + (PCI_STATUS_REC_MASTER_ABORT << 16); + tx4927_pcicptr->pcimask &= ~PCI_STATUS_REC_MASTER_ABORT; + return 0; +} + +static int check_abort(int flags) +{ + int code = PCIBIOS_SUCCESSFUL; + if (tx4927_pcicptr-> + pcistatus & (PCI_STATUS_REC_MASTER_ABORT << 16)) { + tx4927_pcicptr->pcistatus = + (tx4927_pcicptr-> + pcistatus & 0x0000ffff) | (PCI_STATUS_REC_MASTER_ABORT + << 16); + tx4927_pcicptr->pcimask |= PCI_STATUS_REC_MASTER_ABORT; + code = PCIBIOS_DEVICE_NOT_FOUND; + } + return code; +} + +static int tx4927_pcibios_read_config(struct pci_bus *bus, unsigned int devfn, int where, + int size, u32 * val) +{ + int flags, retval, dev, busno, func; + + busno = bus->number; + dev = PCI_SLOT(devfn); + func = PCI_FUNC(devfn); + + /* check if the bus is top-level */ + if (bus->parent != NULL) { + busno = bus->number; + } else { + busno = 0; + } + + if (mkaddr(busno, devfn, where, &flags)) + return -1; + + switch (size) { + case 1: + *val = *(volatile u8 *) ((ulong) & tx4927_pcicptr-> + g2pcfgdata | +#ifdef __LITTLE_ENDIAN + (where & 3)); +#else + ((where & 0x3) ^ 0x3)); +#endif + break; + case 2: + *val = *(volatile u16 *) ((ulong) & tx4927_pcicptr-> + g2pcfgdata | +#ifdef __LITTLE_ENDIAN + (where & 3)); +#else + ((where & 0x3) ^ 0x2)); +#endif + break; + case 4: + *val = tx4927_pcicptr->g2pcfgdata; + break; + } + + retval = check_abort(flags); + if (retval == PCIBIOS_DEVICE_NOT_FOUND) + *val = 0xffffffff; + + return retval; +} + +static int tx4927_pcibios_write_config(struct pci_bus *bus, unsigned int devfn, int where, + int size, u32 val) +{ + int flags, dev, busno, func; + busno = bus->number; + dev = PCI_SLOT(devfn); + func = PCI_FUNC(devfn); + + /* check if the bus is top-level */ + if (bus->parent != NULL) { + busno = bus->number; + } else { + busno = 0; + } + + if (mkaddr(busno, devfn, where, &flags)) + return -1; + + switch (size) { + case 1: + *(volatile u8 *) ((ulong) & tx4927_pcicptr-> + g2pcfgdata | +#ifdef __LITTLE_ENDIAN + (where & 3)) = val; +#else + ((where & 0x3) ^ 0x3)) = val; +#endif + break; + + case 2: + *(volatile u16 *) ((ulong) & tx4927_pcicptr-> + g2pcfgdata | +#ifdef __LITTLE_ENDIAN + (where & 3)) = val; +#else + ((where & 0x3) ^ 0x2)) = val; +#endif + break; + case 4: + tx4927_pcicptr->g2pcfgdata = val; + break; + } + + return check_abort(flags); +} + +struct pci_ops tx4927_pci_ops = { + tx4927_pcibios_read_config, + tx4927_pcibios_write_config +}; + +/* + * h/w only supports devices 0x00 to 0x14 + */ +struct pci_controller tx4927_controller = { + .pci_ops = &tx4927_pci_ops, + .io_resource = &pci_io_resource, + .mem_resource = &pci_mem_resource, +}; |