mips/pci/fixup-sni.c

0001 /*
0002  * This file is subject to the terms and conditions of the GNU General Public
0003  * License.  See the file "COPYING" in the main directory of this archive
0004  * for more details.
0005  *
0006  * SNI specific PCI support for RM200/RM300.
0007  *
0008  * Copyright (C) 1997 - 2000, 2003, 04 Ralf Baechle (ralf@linux-mips.org)
0009  */
0010 #include <linux/kernel.h>
0011 #include <linux/init.h>
0012 #include <linux/pci.h>
0013
0014 #include <asm/mipsregs.h>
0015 #include <asm/sni.h>
0016
0017 #include <irq.h>
0018
0019 /*
0020  * PCIMT Shortcuts ...
0021  */
0022 #define SCSI    PCIMT_IRQ_SCSI
0023 #define ETH PCIMT_IRQ_ETHERNET
0024 #define INTA    PCIMT_IRQ_INTA
0025 #define INTB    PCIMT_IRQ_INTB
0026 #define INTC    PCIMT_IRQ_INTC
0027 #define INTD    PCIMT_IRQ_INTD
0028
0029 /*
0030  * Device 0: PCI EISA Bridge    (directly routed)
0031  * Device 1: NCR53c810 SCSI (directly routed)
0032  * Device 2: PCnet32 Ethernet   (directly routed)
0033  * Device 3: VGA        (routed to INTB)
0034  * Device 4: Unused
0035  * Device 5: Slot 2
0036  * Device 6: Slot 3
0037  * Device 7: Slot 4
0038  *
0039  * Documentation says the VGA is device 5 and device 3 is unused but that
0040  * seem to be a documentation error.  At least on my RM200C the Cirrus
0041  * Logic CL-GD5434 VGA is device 3.
0042  */
0043 static char irq_tab_rm200[8][5] = {
0044     /*   INTA  INTB  INTC  INTD */
0045     {     0,    0,    0,    0,    0 },  /* EISA bridge */
0046     {  SCSI, SCSI, SCSI, SCSI, SCSI },  /* SCSI */
0047     {   ETH,  ETH,  ETH,  ETH,  ETH },  /* Ethernet */
0048     {  INTB, INTB, INTB, INTB, INTB },  /* VGA */
0049     {     0,    0,    0,    0,    0 },  /* Unused */
0050     {     0, INTB, INTC, INTD, INTA },  /* Slot 2 */
0051     {     0, INTC, INTD, INTA, INTB },  /* Slot 3 */
0052     {     0, INTD, INTA, INTB, INTC },  /* Slot 4 */
0053 };
0054
0055 /*
0056  * In Revision D of the RM300 Device 2 has become a normal purpose Slot 1
0057  *
0058  * The VGA card is optional for RM300 systems.
0059  */
0060 static char irq_tab_rm300d[8][5] = {
0061     /*   INTA  INTB  INTC  INTD */
0062     {     0,    0,    0,    0,    0 },  /* EISA bridge */
0063     {  SCSI, SCSI, SCSI, SCSI, SCSI },  /* SCSI */
0064     {     0, INTC, INTD, INTA, INTB },  /* Slot 1 */
0065     {  INTB, INTB, INTB, INTB, INTB },  /* VGA */
0066     {     0,    0,    0,    0,    0 },  /* Unused */
0067     {     0, INTB, INTC, INTD, INTA },  /* Slot 2 */
0068     {     0, INTC, INTD, INTA, INTB },  /* Slot 3 */
0069     {     0, INTD, INTA, INTB, INTC },  /* Slot 4 */
0070 };
0071
0072 static char irq_tab_rm300e[5][5] = {
0073     /*   INTA  INTB  INTC  INTD */
0074     {     0,    0,    0,    0,    0 },  /* HOST bridge */
0075     {  SCSI, SCSI, SCSI, SCSI, SCSI },  /* SCSI */
0076     {     0, INTC, INTD, INTA, INTB },  /* Bridge/i960 */
0077     {     0, INTD, INTA, INTB, INTC },  /* Slot 1 */
0078     {     0, INTA, INTB, INTC, INTD },  /* Slot 2 */
0079 };
0080 #undef SCSI
0081 #undef ETH
0082 #undef INTA
0083 #undef INTB
0084 #undef INTC
0085 #undef INTD
0086
0087
0088 /*
0089  * PCIT Shortcuts ...
0090  */
0091 #define SCSI0   PCIT_IRQ_SCSI0
0092 #define SCSI1   PCIT_IRQ_SCSI1
0093 #define ETH PCIT_IRQ_ETHERNET
0094 #define INTA    PCIT_IRQ_INTA
0095 #define INTB    PCIT_IRQ_INTB
0096 #define INTC    PCIT_IRQ_INTC
0097 #define INTD    PCIT_IRQ_INTD
0098
0099 static char irq_tab_pcit[13][5] = {
0100     /*   INTA  INTB  INTC  INTD */
0101     {     0,     0,     0,     0,     0 },  /* HOST bridge */
0102     { SCSI0, SCSI0, SCSI0, SCSI0, SCSI0 },  /* SCSI */
0103     { SCSI1, SCSI1, SCSI1, SCSI1, SCSI1 },  /* SCSI */
0104     {   ETH,   ETH,   ETH,   ETH,   ETH },  /* Ethernet */
0105     {     0,  INTA,  INTB,  INTC,  INTD },  /* PCI-PCI bridge */
0106     {     0,     0,     0,     0,     0 },  /* Unused */
0107     {     0,     0,     0,     0,     0 },  /* Unused */
0108     {     0,     0,     0,     0,     0 },  /* Unused */
0109     {     0,  INTA,  INTB,  INTC,  INTD },  /* Slot 1 */
0110     {     0,  INTB,  INTC,  INTD,  INTA },  /* Slot 2 */
0111     {     0,  INTC,  INTD,  INTA,  INTB },  /* Slot 3 */
0112     {     0,  INTD,  INTA,  INTB,  INTC },  /* Slot 4 */
0113     {     0,  INTA,  INTB,  INTC,  INTD },  /* Slot 5 */
0114 };
0115
0116 static char irq_tab_pcit_cplus[13][5] = {
0117     /*   INTA  INTB  INTC  INTD */
0118     {     0,     0,     0,     0,     0 },  /* HOST bridge */
0119     {     0,  INTB,  INTC,  INTD,  INTA },  /* PCI Slot 9 */
0120     {     0,     0,     0,     0,     0 },  /* PCI-EISA */
0121     {     0,     0,     0,     0,     0 },  /* Unused */
0122     {     0,  INTA,  INTB,  INTC,  INTD },  /* PCI-PCI bridge */
0123     {     0,  INTB,  INTC,  INTD,  INTA },  /* fixup */
0124 };
0125
0126 static inline int is_rm300_revd(void)
0127 {
0128     unsigned char csmsr = *(volatile unsigned char *)PCIMT_CSMSR;
0129
0130     return (csmsr & 0xa0) == 0x20;
0131 }
0132
0133 int pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)
0134 {
0135     switch (sni_brd_type) {
0136     case SNI_BRD_PCI_TOWER_CPLUS:
0137         if (slot == 4) {
0138             /*
0139              * SNI messed up interrupt wiring for onboard
0140              * PCI bus 1; we need to fix this up here
0141              */
0142             while (dev && dev->bus->number != 1)
0143                 dev = dev->bus->self;
0144             if (dev && dev->devfn >= PCI_DEVFN(4, 0))
0145                 slot = 5;
0146         }
0147         return irq_tab_pcit_cplus[slot][pin];
0148     case SNI_BRD_PCI_TOWER:
0149         return irq_tab_pcit[slot][pin];
0150
0151     case SNI_BRD_PCI_MTOWER:
0152         if (is_rm300_revd())
0153             return irq_tab_rm300d[slot][pin];
0154         fallthrough;
0155     case SNI_BRD_PCI_DESKTOP:
0156         return irq_tab_rm200[slot][pin];
0157
0158     case SNI_BRD_PCI_MTOWER_CPLUS:
0159         return irq_tab_rm300e[slot][pin];
0160     }
0161
0162     return 0;
0163 }
0164
0165 /* Do platform specific device initialization at pci_enable_device() time */
0166 int pcibios_plat_dev_init(struct pci_dev *dev)
0167 {
0168     return 0;
0169 }