forked from Minki/linux
1a59d1b8e0
Based on 1 normalized pattern(s): 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1334 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.113240726@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
168 lines
3.7 KiB
C
168 lines
3.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) NEC Electronics Corporation 2004-2006
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*
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* This file is based on the arch/mips/pci/ops-vr41xx.c
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*
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* Copyright 2001 MontaVista Software Inc.
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*/
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <asm/addrspace.h>
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#include <asm/emma/emma2rh.h>
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#define RTABORT (0x1<<9)
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#define RMABORT (0x1<<10)
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#define EMMA2RH_PCI_SLOT_NUM 9 /* 0000:09.0 is final PCI device */
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/*
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* access config space
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*/
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static int check_args(struct pci_bus *bus, u32 devfn, u32 * bus_num)
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{
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/* check if the bus is top-level */
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if (bus->parent != NULL)
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*bus_num = bus->number;
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else
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*bus_num = 0;
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if (*bus_num == 0) {
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/* Type 0 */
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if (PCI_SLOT(devfn) >= 10)
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return PCIBIOS_DEVICE_NOT_FOUND;
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} else {
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/* Type 1 */
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if ((*bus_num >= 64) || (PCI_SLOT(devfn) >= 16))
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return PCIBIOS_DEVICE_NOT_FOUND;
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}
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return 0;
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}
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static inline int set_pci_configuration_address(unsigned char bus_num,
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unsigned int devfn, int where)
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{
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u32 config_win0;
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emma2rh_out32(EMMA2RH_PCI_INT, ~RMABORT);
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if (bus_num == 0)
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/*
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* Type 0 configuration
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*/
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config_win0 = (1 << (22 + PCI_SLOT(devfn))) | (5 << 9);
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else
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/*
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* Type 1 configuration
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*/
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config_win0 = (bus_num << 26) | (PCI_SLOT(devfn) << 22) |
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(1 << 15) | (5 << 9);
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emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, config_win0);
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return 0;
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}
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static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
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int size, uint32_t * val)
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{
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u32 bus_num;
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u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE);
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u32 backup_win0;
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u32 data;
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*val = 0xffffffffU;
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if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND)
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return PCIBIOS_DEVICE_NOT_FOUND;
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backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR);
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if (set_pci_configuration_address(bus_num, devfn, where) < 0)
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return PCIBIOS_DEVICE_NOT_FOUND;
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data =
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*(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
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(where & 0xfffffffc));
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switch (size) {
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case 1:
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*val = (data >> ((where & 3) << 3)) & 0xffU;
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break;
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case 2:
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*val = (data >> ((where & 2) << 3)) & 0xffffU;
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break;
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case 4:
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*val = data;
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break;
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default:
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emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
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return PCIBIOS_FUNC_NOT_SUPPORTED;
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}
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emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
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if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT)
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return PCIBIOS_DEVICE_NOT_FOUND;
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return PCIBIOS_SUCCESSFUL;
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}
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static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
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int size, u32 val)
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{
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u32 bus_num;
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u32 base = KSEG1ADDR(EMMA2RH_PCI_CONFIG_BASE);
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u32 backup_win0;
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u32 data;
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int shift;
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if (check_args(bus, devfn, &bus_num) == PCIBIOS_DEVICE_NOT_FOUND)
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return PCIBIOS_DEVICE_NOT_FOUND;
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backup_win0 = emma2rh_in32(EMMA2RH_PCI_IWIN0_CTR);
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if (set_pci_configuration_address(bus_num, devfn, where) < 0)
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return PCIBIOS_DEVICE_NOT_FOUND;
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/* read modify write */
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data =
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*(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
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(where & 0xfffffffc));
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switch (size) {
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case 1:
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shift = (where & 3) << 3;
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data &= ~(0xffU << shift);
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data |= ((val & 0xffU) << shift);
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break;
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case 2:
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shift = (where & 2) << 3;
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data &= ~(0xffffU << shift);
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data |= ((val & 0xffffU) << shift);
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break;
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case 4:
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data = val;
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break;
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default:
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emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
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return PCIBIOS_FUNC_NOT_SUPPORTED;
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}
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*(volatile u32 *)(base + (PCI_FUNC(devfn) << 8) +
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(where & 0xfffffffc)) = data;
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emma2rh_out32(EMMA2RH_PCI_IWIN0_CTR, backup_win0);
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if (emma2rh_in32(EMMA2RH_PCI_INT) & RMABORT)
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return PCIBIOS_DEVICE_NOT_FOUND;
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return PCIBIOS_SUCCESSFUL;
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}
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struct pci_ops emma2rh_pci_ops = {
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.read = pci_config_read,
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.write = pci_config_write,
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};
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