/* * Copyright (C) 1999, 2000, 2004 MIPS Technologies, Inc. * All rights reserved. * Authors: Carsten Langgaard <carstenl@mips.com> * Maciej W. Rozycki <macro@mips.com> * * This program is free software; you can distribute it and/or modify it * under the terms of the GNU General Public License (Version 2) as * published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * for more details. * * 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., * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. * * MIPS boards specific PCI support. */ #include <linux/types.h> #include <linux/pci.h> #include <linux/kernel.h> #include <linux/init.h> #include <asm/mips-boards/bonito64.h> #define PCI_ACCESS_READ 0 #define PCI_ACCESS_WRITE 1 /* * PCI configuration cycle AD bus definition */ /* Type 0 */ #define PCI_CFG_TYPE0_REG_SHF 0 #define PCI_CFG_TYPE0_FUNC_SHF 8 /* Type 1 */ #define PCI_CFG_TYPE1_REG_SHF 0 #define PCI_CFG_TYPE1_FUNC_SHF 8 #define PCI_CFG_TYPE1_DEV_SHF 11 #define PCI_CFG_TYPE1_BUS_SHF 16 static int bonito64_pcibios_config_access(unsigned char access_type, struct pci_bus *bus, unsigned int devfn, int where, u32 * data) { unsigned char busnum = bus->number; u32 dummy; u64 pci_addr; /* Algorithmics Bonito64 system controller. */ if ((busnum == 0) && (PCI_SLOT(devfn) > 21)) { /* We number bus 0 devices from 0..21 */ return -1; } /* Clear cause register bits */ BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR | BONITO_PCICMD_MTABORT_CLR); /* * Setup pattern to be used as PCI "address" for * Type 0 cycle */ if (busnum == 0) { /* IDSEL */ pci_addr = (u64) 1 << (PCI_SLOT(devfn) + 10); } else { /* Bus number */ pci_addr = busnum << PCI_CFG_TYPE1_BUS_SHF; /* Device number */ pci_addr |= PCI_SLOT(devfn) << PCI_CFG_TYPE1_DEV_SHF; } /* Function (same for Type 0/1) */ pci_addr |= PCI_FUNC(devfn) << PCI_CFG_TYPE0_FUNC_SHF; /* Register number (same for Type 0/1) */ pci_addr |= (where & ~0x3) << PCI_CFG_TYPE0_REG_SHF; if (busnum == 0) { /* Type 0 */ BONITO_PCIMAP_CFG = pci_addr >> 16; } else { /* Type 1 */ BONITO_PCIMAP_CFG = (pci_addr >> 16) | 0x10000; } pci_addr &= 0xffff; /* Flush Bonito register block */ dummy = BONITO_PCIMAP_CFG; iob(); /* sync */ /* Perform access */ if (access_type == PCI_ACCESS_WRITE) { *(volatile u32 *) (_pcictrl_bonito_pcicfg + (u32)pci_addr) = *(u32 *) data; /* Wait till done */ while (BONITO_PCIMSTAT & 0xF); } else { *(u32 *) data = *(volatile u32 *) (_pcictrl_bonito_pcicfg + (u32)pci_addr); } /* Detect Master/Target abort */ if (BONITO_PCICMD & (BONITO_PCICMD_MABORT_CLR | BONITO_PCICMD_MTABORT_CLR)) { /* Error occurred */ /* Clear bits */ BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR | BONITO_PCICMD_MTABORT_CLR); return -1; } 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 bonito64_pcibios_read(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 * val) { u32 data = 0; if ((size == 2) && (where & 1)) return PCIBIOS_BAD_REGISTER_NUMBER; else if ((size == 4) && (where & 3)) return PCIBIOS_BAD_REGISTER_NUMBER; if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where, &data)) return -1; if (size == 1) *val = (data >> ((where & 3) << 3)) & 0xff; else if (size == 2) *val = (data >> ((where & 3) << 3)) & 0xffff; else *val = data; return PCIBIOS_SUCCESSFUL; } static int bonito64_pcibios_write(struct pci_bus *bus, unsigned int devfn, int where, int size, u32 val) { u32 data = 0; if ((size == 2) && (where & 1)) return PCIBIOS_BAD_REGISTER_NUMBER; else if ((size == 4) && (where & 3)) return PCIBIOS_BAD_REGISTER_NUMBER; if (size == 4) data = val; else { if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where, &data)) return -1; if (size == 1) data = (data & ~(0xff << ((where & 3) << 3))) | (val << ((where & 3) << 3)); else if (size == 2) data = (data & ~(0xffff << ((where & 3) << 3))) | (val << ((where & 3) << 3)); } if (bonito64_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data)) return -1; return PCIBIOS_SUCCESSFUL; } struct pci_ops bonito64_pci_ops = { .read = bonito64_pcibios_read, .write = bonito64_pcibios_write };