/* * * BRIEF MODULE DESCRIPTION * IT8172 system controller specific pci support. * * Copyright 2000 MontaVista Software Inc. * Author: MontaVista Software, Inc. * ppopov@mvista.com or source@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 #ifdef CONFIG_PCI #include #include #include #include #include #include #define PCI_ACCESS_READ 0 #define PCI_ACCESS_WRITE 1 #undef DEBUG #undef DEBUG_CONFIG_CYCLES static int it8172_pcibios_config_access(unsigned char access_type, struct pci_dev *dev, unsigned char where, u32 *data) { /* * config cycles are on 4 byte boundary only */ unsigned char bus = dev->bus->number; unsigned char dev_fn = dev->devfn; #ifdef DEBUG_CONFIG_CYCLES printk("it config: type %d dev %x bus %d dev_fn %x data %x\n", access_type, dev, bus, dev_fn, *data); #endif /* Setup address */ IT_WRITE(IT_CONFADDR, (bus << IT_BUSNUM_SHF) | (dev_fn << IT_FUNCNUM_SHF) | (where & ~0x3)); if (access_type == PCI_ACCESS_WRITE) { IT_WRITE(IT_CONFDATA, *data); } else { IT_READ(IT_CONFDATA, *data); } /* * Revisit: check for master or target abort. */ return 0; } /* * We can't address 8 and 16 bit words directly. Instead we have to * read/write a 32bit word and mask/modify the data we actually want. */ static int it8172_pcibios_read_config_byte (struct pci_dev *dev, int where, u8 *val) { u32 data = 0; if (it8172_pcibios_config_access(PCI_ACCESS_READ, dev, where, &data)) return -1; *val = (data >> ((where & 3) << 3)) & 0xff; #ifdef DEBUG printk("cfg read byte: bus %d dev_fn %x where %x: val %x\n", dev->bus->number, dev->devfn, where, *val); #endif return PCIBIOS_SUCCESSFUL; } static int it8172_pcibios_read_config_word (struct pci_dev *dev, int where, u16 *val) { u32 data = 0; if (where & 1) return PCIBIOS_BAD_REGISTER_NUMBER; if (it8172_pcibios_config_access(PCI_ACCESS_READ, dev, where, &data)) return -1; *val = (data >> ((where & 3) << 3)) & 0xffff; #ifdef DEBUG printk("cfg read word: bus %d dev_fn %x where %x: val %x\n", dev->bus->number, dev->devfn, where, *val); #endif return PCIBIOS_SUCCESSFUL; } static int it8172_pcibios_read_config_dword (struct pci_dev *dev, int where, u32 *val) { u32 data = 0; if (where & 3) return PCIBIOS_BAD_REGISTER_NUMBER; if (it8172_pcibios_config_access(PCI_ACCESS_READ, dev, where, &data)) return -1; *val = data; #ifdef DEBUG printk("cfg read dword: bus %d dev_fn %x where %x: val %x\n", dev->bus->number, dev->devfn, where, *val); #endif return PCIBIOS_SUCCESSFUL; } static int it8172_pcibios_write_config_byte (struct pci_dev *dev, int where, u8 val) { u32 data = 0; if (it8172_pcibios_config_access(PCI_ACCESS_READ, dev, where, &data)) return -1; data = (data & ~(0xff << ((where & 3) << 3))) | (val << ((where & 3) << 3)); if (it8172_pcibios_config_access(PCI_ACCESS_WRITE, dev, where, &data)) return -1; return PCIBIOS_SUCCESSFUL; } static int it8172_pcibios_write_config_word (struct pci_dev *dev, int where, u16 val) { u32 data = 0; if (where & 1) return PCIBIOS_BAD_REGISTER_NUMBER; if (it8172_pcibios_config_access(PCI_ACCESS_READ, dev, where, &data)) return -1; data = (data & ~(0xffff << ((where & 3) << 3))) | (val << ((where & 3) << 3)); if (it8172_pcibios_config_access(PCI_ACCESS_WRITE, dev, where, &data)) return -1; return PCIBIOS_SUCCESSFUL; } static int it8172_pcibios_write_config_dword(struct pci_dev *dev, int where, u32 val) { if (where & 3) return PCIBIOS_BAD_REGISTER_NUMBER; if (it8172_pcibios_config_access(PCI_ACCESS_WRITE, dev, where, &val)) return -1; return PCIBIOS_SUCCESSFUL; } struct pci_ops it8172_pci_ops = { it8172_pcibios_read_config_byte, it8172_pcibios_read_config_word, it8172_pcibios_read_config_dword, it8172_pcibios_write_config_byte, it8172_pcibios_write_config_word, it8172_pcibios_write_config_dword }; void __init pcibios_init(void) { printk("PCI: Probing PCI hardware on host bus 0.\n"); pci_scan_bus(0, &it8172_pci_ops, NULL); } int __init pcibios_enable_device(struct pci_dev *dev) { u16 cmd, old_cmd; int idx; struct resource *r; pci_read_config_word(dev, PCI_COMMAND, &cmd); old_cmd = cmd; for(idx=0; idx<6; idx++) { r = &dev->resource[idx]; if (!r->start && r->end) { printk(KERN_ERR "PCI: Device %s not available because of resource collisions\n", dev->slot_name); return -EINVAL; } if (r->flags & IORESOURCE_IO) cmd |= PCI_COMMAND_IO; if (r->flags & IORESOURCE_MEM) cmd |= PCI_COMMAND_MEMORY; } if (dev->resource[PCI_ROM_RESOURCE].start) cmd |= PCI_COMMAND_MEMORY; if (cmd != old_cmd) { printk("PCI: Enabling device %s (%04x -> %04x)\n", dev->slot_name, old_cmd, cmd); pci_write_config_word(dev, PCI_COMMAND, cmd); } return 0; } void __init pcibios_align_resource(void *data, struct resource *res, unsigned long size) { printk("pcibios_align_resource\n"); } char * __init pcibios_setup(char *str) { /* Nothing to do for now. */ return str; } void __init pcibios_update_resource(struct pci_dev *dev, struct resource *root, struct resource *res, int resource) { unsigned long where, size; u32 reg; where = PCI_BASE_ADDRESS_0 + (resource * 4); size = res->end - res->start; pci_read_config_dword(dev, where, ®); reg = (reg & size) | (((u32)(res->start - root->start)) & ~size); pci_write_config_dword(dev, where, reg); } void __init pcibios_fixup_bus(struct pci_bus *b) { //printk("pcibios_fixup_bus\n"); } #endif /* CONFIG_PCI */