1*41173abcSThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only
21da177e4SLinus Torvalds /*
3aa0980b8SMaciej W. Rozycki * Copyright (C) 1999, 2000, 2004 MIPS Technologies, Inc.
4aa0980b8SMaciej W. Rozycki * All rights reserved.
5aa0980b8SMaciej W. Rozycki * Authors: Carsten Langgaard <carstenl@mips.com>
6aa0980b8SMaciej W. Rozycki * Maciej W. Rozycki <macro@mips.com>
71da177e4SLinus Torvalds *
81da177e4SLinus Torvalds * MIPS boards specific PCI support.
91da177e4SLinus Torvalds */
101da177e4SLinus Torvalds #include <linux/types.h>
111da177e4SLinus Torvalds #include <linux/pci.h>
121da177e4SLinus Torvalds #include <linux/kernel.h>
131da177e4SLinus Torvalds
141da177e4SLinus Torvalds #include <asm/mips-boards/bonito64.h>
151da177e4SLinus Torvalds
161da177e4SLinus Torvalds #define PCI_ACCESS_READ 0
171da177e4SLinus Torvalds #define PCI_ACCESS_WRITE 1
181da177e4SLinus Torvalds
1942d226c7SSongmao Tian #define CFG_SPACE_REG(offset) (void *)CKSEG1ADDR(_pcictrl_bonito_pcicfg + (offset))
2042d226c7SSongmao Tian #define ID_SEL_BEGIN 10
2142d226c7SSongmao Tian #define MAX_DEV_NUM (31 - ID_SEL_BEGIN)
221da177e4SLinus Torvalds
231da177e4SLinus Torvalds
bonito64_pcibios_config_access(unsigned char access_type,struct pci_bus * bus,unsigned int devfn,int where,u32 * data)241da177e4SLinus Torvalds static int bonito64_pcibios_config_access(unsigned char access_type,
251da177e4SLinus Torvalds struct pci_bus *bus,
261da177e4SLinus Torvalds unsigned int devfn, int where,
271da177e4SLinus Torvalds u32 * data)
281da177e4SLinus Torvalds {
2942d226c7SSongmao Tian u32 busnum = bus->number;
3042d226c7SSongmao Tian u32 addr, type;
311da177e4SLinus Torvalds u32 dummy;
3242d226c7SSongmao Tian void *addrp;
3342d226c7SSongmao Tian int device = PCI_SLOT(devfn);
3442d226c7SSongmao Tian int function = PCI_FUNC(devfn);
3542d226c7SSongmao Tian int reg = where & ~3;
361da177e4SLinus Torvalds
3742d226c7SSongmao Tian if (busnum == 0) {
3842d226c7SSongmao Tian /* Type 0 configuration for onboard PCI bus */
3942d226c7SSongmao Tian if (device > MAX_DEV_NUM)
401da177e4SLinus Torvalds return -1;
411da177e4SLinus Torvalds
4242d226c7SSongmao Tian addr = (1 << (device + ID_SEL_BEGIN)) | (function << 8) | reg;
4342d226c7SSongmao Tian type = 0;
441da177e4SLinus Torvalds } else {
4542d226c7SSongmao Tian /* Type 1 configuration for offboard PCI bus */
4642d226c7SSongmao Tian addr = (busnum << 16) | (device << 11) | (function << 8) | reg;
4742d226c7SSongmao Tian type = 0x10000;
481da177e4SLinus Torvalds }
491da177e4SLinus Torvalds
5042d226c7SSongmao Tian /* Clear aborts */
5142d226c7SSongmao Tian BONITO_PCICMD |= BONITO_PCICMD_MABORT_CLR | BONITO_PCICMD_MTABORT_CLR;
521da177e4SLinus Torvalds
5342d226c7SSongmao Tian BONITO_PCIMAP_CFG = (addr >> 16) | type;
541da177e4SLinus Torvalds
551da177e4SLinus Torvalds /* Flush Bonito register block */
561da177e4SLinus Torvalds dummy = BONITO_PCIMAP_CFG;
5742d226c7SSongmao Tian mmiowb();
581da177e4SLinus Torvalds
5942d226c7SSongmao Tian addrp = CFG_SPACE_REG(addr & 0xffff);
601da177e4SLinus Torvalds if (access_type == PCI_ACCESS_WRITE) {
6142d226c7SSongmao Tian writel(cpu_to_le32(*data), addrp);
621da177e4SLinus Torvalds /* Wait till done */
631da177e4SLinus Torvalds while (BONITO_PCIMSTAT & 0xF);
641da177e4SLinus Torvalds } else {
6542d226c7SSongmao Tian *data = le32_to_cpu(readl(addrp));
661da177e4SLinus Torvalds }
671da177e4SLinus Torvalds
681da177e4SLinus Torvalds /* Detect Master/Target abort */
691da177e4SLinus Torvalds if (BONITO_PCICMD & (BONITO_PCICMD_MABORT_CLR |
701da177e4SLinus Torvalds BONITO_PCICMD_MTABORT_CLR)) {
711da177e4SLinus Torvalds /* Error occurred */
721da177e4SLinus Torvalds
731da177e4SLinus Torvalds /* Clear bits */
741da177e4SLinus Torvalds BONITO_PCICMD |= (BONITO_PCICMD_MABORT_CLR |
751da177e4SLinus Torvalds BONITO_PCICMD_MTABORT_CLR);
761da177e4SLinus Torvalds
771da177e4SLinus Torvalds return -1;
781da177e4SLinus Torvalds }
791da177e4SLinus Torvalds
801da177e4SLinus Torvalds return 0;
8142d226c7SSongmao Tian
821da177e4SLinus Torvalds }
831da177e4SLinus Torvalds
841da177e4SLinus Torvalds
851da177e4SLinus Torvalds /*
861da177e4SLinus Torvalds * We can't address 8 and 16 bit words directly. Instead we have to
871da177e4SLinus Torvalds * read/write a 32bit word and mask/modify the data we actually want.
881da177e4SLinus Torvalds */
bonito64_pcibios_read(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 * val)891da177e4SLinus Torvalds static int bonito64_pcibios_read(struct pci_bus *bus, unsigned int devfn,
901da177e4SLinus Torvalds int where, int size, u32 * val)
911da177e4SLinus Torvalds {
921da177e4SLinus Torvalds u32 data = 0;
931da177e4SLinus Torvalds
941da177e4SLinus Torvalds if ((size == 2) && (where & 1))
951da177e4SLinus Torvalds return PCIBIOS_BAD_REGISTER_NUMBER;
961da177e4SLinus Torvalds else if ((size == 4) && (where & 3))
971da177e4SLinus Torvalds return PCIBIOS_BAD_REGISTER_NUMBER;
981da177e4SLinus Torvalds
991da177e4SLinus Torvalds if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn, where,
1001da177e4SLinus Torvalds &data))
1011da177e4SLinus Torvalds return -1;
1021da177e4SLinus Torvalds
1031da177e4SLinus Torvalds if (size == 1)
1041da177e4SLinus Torvalds *val = (data >> ((where & 3) << 3)) & 0xff;
1051da177e4SLinus Torvalds else if (size == 2)
1061da177e4SLinus Torvalds *val = (data >> ((where & 3) << 3)) & 0xffff;
1071da177e4SLinus Torvalds else
1081da177e4SLinus Torvalds *val = data;
1091da177e4SLinus Torvalds
1101da177e4SLinus Torvalds return PCIBIOS_SUCCESSFUL;
1111da177e4SLinus Torvalds }
1121da177e4SLinus Torvalds
bonito64_pcibios_write(struct pci_bus * bus,unsigned int devfn,int where,int size,u32 val)1131da177e4SLinus Torvalds static int bonito64_pcibios_write(struct pci_bus *bus, unsigned int devfn,
1141da177e4SLinus Torvalds int where, int size, u32 val)
1151da177e4SLinus Torvalds {
1161da177e4SLinus Torvalds u32 data = 0;
1171da177e4SLinus Torvalds
1181da177e4SLinus Torvalds if ((size == 2) && (where & 1))
1191da177e4SLinus Torvalds return PCIBIOS_BAD_REGISTER_NUMBER;
1201da177e4SLinus Torvalds else if ((size == 4) && (where & 3))
1211da177e4SLinus Torvalds return PCIBIOS_BAD_REGISTER_NUMBER;
1221da177e4SLinus Torvalds
1231da177e4SLinus Torvalds if (size == 4)
1241da177e4SLinus Torvalds data = val;
1251da177e4SLinus Torvalds else {
1261da177e4SLinus Torvalds if (bonito64_pcibios_config_access(PCI_ACCESS_READ, bus, devfn,
1271da177e4SLinus Torvalds where, &data))
1281da177e4SLinus Torvalds return -1;
1291da177e4SLinus Torvalds
1301da177e4SLinus Torvalds if (size == 1)
1311da177e4SLinus Torvalds data = (data & ~(0xff << ((where & 3) << 3))) |
1321da177e4SLinus Torvalds (val << ((where & 3) << 3));
1331da177e4SLinus Torvalds else if (size == 2)
1341da177e4SLinus Torvalds data = (data & ~(0xffff << ((where & 3) << 3))) |
1351da177e4SLinus Torvalds (val << ((where & 3) << 3));
1361da177e4SLinus Torvalds }
1371da177e4SLinus Torvalds
1381da177e4SLinus Torvalds if (bonito64_pcibios_config_access(PCI_ACCESS_WRITE, bus, devfn, where,
1391da177e4SLinus Torvalds &data))
1401da177e4SLinus Torvalds return -1;
1411da177e4SLinus Torvalds
1421da177e4SLinus Torvalds return PCIBIOS_SUCCESSFUL;
1431da177e4SLinus Torvalds }
1441da177e4SLinus Torvalds
1451da177e4SLinus Torvalds struct pci_ops bonito64_pci_ops = {
1461da177e4SLinus Torvalds .read = bonito64_pcibios_read,
1471da177e4SLinus Torvalds .write = bonito64_pcibios_write
1481da177e4SLinus Torvalds };
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