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  1// SPDX-License-Identifier: GPL-2.0-or-later
  2/*
  3 *  ops-vr41xx.c, PCI configuration routines for the PCIU of NEC VR4100 series.
  4 *
  5 *  Copyright (C) 2001-2003 MontaVista Software Inc.
  6 *    Author: Yoichi Yuasa <source@mvista.com>
  7 *  Copyright (C) 2004-2005  Yoichi Yuasa <yuasa@linux-mips.org>
  8 */
  9/*
 10 * Changes:
 11 *  MontaVista Software Inc. <source@mvista.com>
 12 *  - New creation, NEC VR4122 and VR4131 are supported.
 13 */
 14#include <linux/pci.h>
 15#include <linux/types.h>
 16
 17#include <asm/io.h>
 18
 19#define PCICONFDREG	(void __iomem *)KSEG1ADDR(0x0f000c14)
 20#define PCICONFAREG	(void __iomem *)KSEG1ADDR(0x0f000c18)
 21
 22static inline int set_pci_configuration_address(unsigned char number,
 23						unsigned int devfn, int where)
 24{
 25	if (number == 0) {
 26		/*
 27		 * Type 0 configuration
 28		 */
 29		if (PCI_SLOT(devfn) < 11 || where > 0xff)
 30			return -EINVAL;
 31
 32		writel((1U << PCI_SLOT(devfn)) | (PCI_FUNC(devfn) << 8) |
 33		       (where & 0xfc), PCICONFAREG);
 34	} else {
 35		/*
 36		 * Type 1 configuration
 37		 */
 38		if (where > 0xff)
 39			return -EINVAL;
 40
 41		writel(((uint32_t)number << 16) | ((devfn & 0xff) << 8) |
 42		       (where & 0xfc) | 1U, PCICONFAREG);
 43	}
 44
 45	return 0;
 46}
 47
 48static int pci_config_read(struct pci_bus *bus, unsigned int devfn, int where,
 49			   int size, uint32_t *val)
 50{
 51	uint32_t data;
 52
 53	*val = 0xffffffffU;
 54	if (set_pci_configuration_address(bus->number, devfn, where) < 0)
 55		return PCIBIOS_DEVICE_NOT_FOUND;
 56
 57	data = readl(PCICONFDREG);
 58
 59	switch (size) {
 60	case 1:
 61		*val = (data >> ((where & 3) << 3)) & 0xffU;
 62		break;
 63	case 2:
 64		*val = (data >> ((where & 2) << 3)) & 0xffffU;
 65		break;
 66	case 4:
 67		*val = data;
 68		break;
 69	default:
 70		return PCIBIOS_FUNC_NOT_SUPPORTED;
 71	}
 72
 73	return PCIBIOS_SUCCESSFUL;
 74}
 75
 76static int pci_config_write(struct pci_bus *bus, unsigned int devfn, int where,
 77			    int size, uint32_t val)
 78{
 79	uint32_t data;
 80	int shift;
 81
 82	if (set_pci_configuration_address(bus->number, devfn, where) < 0)
 83		return PCIBIOS_DEVICE_NOT_FOUND;
 84
 85	data = readl(PCICONFDREG);
 86
 87	switch (size) {
 88	case 1:
 89		shift = (where & 3) << 3;
 90		data &= ~(0xffU << shift);
 91		data |= ((val & 0xffU) << shift);
 92		break;
 93	case 2:
 94		shift = (where & 2) << 3;
 95		data &= ~(0xffffU << shift);
 96		data |= ((val & 0xffffU) << shift);
 97		break;
 98	case 4:
 99		data = val;
100		break;
101	default:
102		return PCIBIOS_FUNC_NOT_SUPPORTED;
103	}
104
105	writel(data, PCICONFDREG);
106
107	return PCIBIOS_SUCCESSFUL;
108}
109
110struct pci_ops vr41xx_pci_ops = {
111	.read	= pci_config_read,
112	.write	= pci_config_write,
113};