diff options
Diffstat (limited to 'arch/mips/pci/ops-emma2rh.c')
| -rw-r--r-- | arch/mips/pci/ops-emma2rh.c | 186 |
1 files changed, 186 insertions, 0 deletions
diff --git a/arch/mips/pci/ops-emma2rh.c b/arch/mips/pci/ops-emma2rh.c new file mode 100644 index 00000000000..e21b11bf66b --- /dev/null +++ b/arch/mips/pci/ops-emma2rh.c @@ -0,0 +1,186 @@ +/* + * arch/mips/pci/ops-emma2rh.c + * This file defines the PCI operation for EMMA2RH. + * + * Copyright (C) NEC Electronics Corporation 2004-2006 + * + * This file is based on the arch/mips/pci/ops-vr41xx.c + * + * Copyright 2001 MontaVista Software Inc. + * + * 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 program is distributed in the hope that 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 + */ + +#include <linux/config.h> +#include <linux/pci.h> +#include <linux/kernel.h> +#include <linux/types.h> + +#include <asm/addrspace.h> +#include <asm/debug.h> + +#include <asm/emma2rh/emma2rh.h> + +#define RTABORT (0x1<<9) +#define RMABORT (0x1<<10) +#define EMMA2RH_PCI_SLOT_NUM 9 /* 0000:09.0 is final PCI device */ + +/* + * access config space + */ + +static int check_args(struct pci_bus *bus, u32 devfn, u32 * bus_num) +{ + /* check if the bus is top-level */ + if (bus->parent != NULL) { + *bus_num = bus->number; + db_assert(bus_num != 0); + } else + *bus_num = 0; + + if (*bus_num == 0) { + /* Type 0 */ + if (PCI_SLOT(devfn) >= 10) + return PCIBIOS_DEVICE_NOT_FOUND; + } else { + /* Type 1 */ + if ((*bus_num >= 64) || (PCI_SLOT(devfn) >= 16)) + return PCIBIOS_DEVICE_NOT_FOUND; + } + return 0; +} + +static inline int set_pci_configuration_address(unsigned char bus_num, + unsigned int devfn, int where) +{ + u32 config_win0; + + emma2rh_out32(EMMA2RH_PCI_INT, ~RMABORT); + if (bus_num == 0) + /* + * Type 0 configuration + */ + config_win0 = (1 << (22 + PCI_SLOT(devfn))) | (5 << 9); + else + /* + * Type 1 configuration + */ + config_win0 = (bus_num << 26) | (PCI_SLOT(devfn) << 22) | + (1 << 15) | (5 << 9); + + emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, config_win0); + + return 0; +} + +static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where, + int size, uint32_t * val) +{ + u32 bus_num; + u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE); + u32 backup_win0; + u32 data; + + *val = 0xffffffffU; + + if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND) + return PCIBIOS_DEVICE_NOT_FOUND; + + backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR); + + if (set_pci_configuration_address(bus_num, devfn, where) < 0) + return PCIBIOS_DEVICE_NOT_FOUND; + + data = + *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) + + (where & 0xfffffffc)); + + switch (size) { + case 1: + *val = (data >> ((where & 3) << 3)) & 0xffU; + break; + case 2: + *val = (data >> ((where & 2) << 3)) & 0xffffU; + break; + case 4: + *val = data; + break; + default: + emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0); + return PCIBIOS_FUNC_NOT_SUPPORTED; + } + + emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0); + + if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT) + return PCIBIOS_DEVICE_NOT_FOUND; + + return PCIBIOS_SUCCESSFUL; +} + +static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where, + int size, u32 val) +{ + u32 bus_num; + u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE); + u32 backup_win0; + u32 data; + int shift; + + if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND) + return PCIBIOS_DEVICE_NOT_FOUND; + + backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR); + + if (set_pci_configuration_address(bus_num, devfn, where) < 0) + return PCIBIOS_DEVICE_NOT_FOUND; + + /* read modify write */ + data = + *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) + + (where & 0xfffffffc)); + + switch (size) { + case 1: + shift = (where & 3) << 3; + data &= ~(0xffU << shift); + data |= ((val & 0xffU) << shift); + break; + case 2: + shift = (where & 2) << 3; + data &= ~(0xffffU << shift); + data |= ((val & 0xffffU) << shift); + break; + case 4: + data = val; + break; + default: + emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0); + return PCIBIOS_FUNC_NOT_SUPPORTED; + } + *(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) + + (where & 0xfffffffc)) = data; + + emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0); + if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT) + return PCIBIOS_DEVICE_NOT_FOUND; + + return PCIBIOS_SUCCESSFUL; +} + +struct pci_ops emma2rh_pci_ops = { + .read = pci_config_read, + .write = pci_config_write, +}; |