diff options
Diffstat (limited to 'kernel/arch/mips/pci/ops-bonito64.c')
| -rw-r--r-- | kernel/arch/mips/pci/ops-bonito64.c | 160 |
1 files changed, 160 insertions, 0 deletions
diff --git a/kernel/arch/mips/pci/ops-bonito64.c b/kernel/arch/mips/pci/ops-bonito64.c new file mode 100644 index 000000000..c06205a87 --- /dev/null +++ b/kernel/arch/mips/pci/ops-bonito64.c @@ -0,0 +1,160 @@ +/* + * 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 <asm/mips-boards/bonito64.h> + +#define PCI_ACCESS_READ 0 +#define PCI_ACCESS_WRITE 1 + +#define CFG_SPACE_REG(offset) (void *)CKSEG1ADDR(_pcictrl_bonito_pcicfg + (offset)) +#define ID_SEL_BEGIN 10 +#define MAX_DEV_NUM (31 - ID_SEL_BEGIN) + + +static int bonito64_pcibios_config_access(unsigned char access_type, + struct pci_bus *bus, + unsigned int devfn, int where, + u32 * data) +{ + u32 busnum = bus->number; + u32 addr, type; + u32 dummy; + void *addrp; + int device = PCI_SLOT(devfn); + int function = PCI_FUNC(devfn); + int reg = where & ~3; + + if (busnum == 0) { + /* Type 0 configuration for onboard PCI bus */ + if (device > MAX_DEV_NUM) + return -1; + + addr = (1 << (device + ID_SEL_BEGIN)) | (function << 8) | reg; + type = 0; + } else { + /* Type 1 configuration for offboard PCI bus */ + addr = (busnum << 16) | (device << 11) | (function << 8) | reg; + type = 0x10000; + } + + /* Clear aborts */ + BONITO_PCICMD |= BONITO_PCICMD_MABORT_CLR | BONITO_PCICMD_MTABORT_CLR; + + BONITO_PCIMAP_CFG = (addr >> 16) | type; + + /* Flush Bonito register block */ + dummy = BONITO_PCIMAP_CFG; + mmiowb(); + + addrp = CFG_SPACE_REG(addr & 0xffff); + if (access_type == PCI_ACCESS_WRITE) { + writel(cpu_to_le32(*data), addrp); + /* Wait till done */ + while (BONITO_PCIMSTAT & 0xF); + } else { + *data = le32_to_cpu(readl(addrp)); + } + + /* 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 +}; |