| Kyle Swenson | 8d8f654 | 2021-03-15 11:02:55 -0600 | [diff] [blame^] | 1 | /* |
| 2 | * Toshiba rbtx4938 pci routines |
| 3 | * Copyright (C) 2000-2001 Toshiba Corporation |
| 4 | * |
| 5 | * 2003-2005 (c) MontaVista Software, Inc. This file is licensed under the |
| 6 | * terms of the GNU General Public License version 2. This program is |
| 7 | * licensed "as is" without any warranty of any kind, whether express |
| 8 | * or implied. |
| 9 | * |
| 10 | * Support for TX4938 in 2.6 - Manish Lachwani (mlachwani@mvista.com) |
| 11 | */ |
| 12 | #include <linux/types.h> |
| 13 | #include <asm/txx9/pci.h> |
| 14 | #include <asm/txx9/rbtx4938.h> |
| 15 | |
| 16 | int __init rbtx4938_pci_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) |
| 17 | { |
| 18 | int irq = tx4938_pcic1_map_irq(dev, slot); |
| 19 | |
| 20 | if (irq >= 0) |
| 21 | return irq; |
| 22 | irq = pin; |
| 23 | /* IRQ rotation */ |
| 24 | irq--; /* 0-3 */ |
| 25 | if (slot == TX4927_PCIC_IDSEL_AD_TO_SLOT(23)) { |
| 26 | /* PCI CardSlot (IDSEL=A23) */ |
| 27 | /* PCIA => PCIA (IDSEL=A23) */ |
| 28 | irq = (irq + 0 + slot) % 4; |
| 29 | } else { |
| 30 | /* PCI Backplane */ |
| 31 | if (txx9_pci_option & TXX9_PCI_OPT_PICMG) |
| 32 | irq = (irq + 33 - slot) % 4; |
| 33 | else |
| 34 | irq = (irq + 3 + slot) % 4; |
| 35 | } |
| 36 | irq++; /* 1-4 */ |
| 37 | |
| 38 | switch (irq) { |
| 39 | case 1: |
| 40 | irq = RBTX4938_IRQ_IOC_PCIA; |
| 41 | break; |
| 42 | case 2: |
| 43 | irq = RBTX4938_IRQ_IOC_PCIB; |
| 44 | break; |
| 45 | case 3: |
| 46 | irq = RBTX4938_IRQ_IOC_PCIC; |
| 47 | break; |
| 48 | case 4: |
| 49 | irq = RBTX4938_IRQ_IOC_PCID; |
| 50 | break; |
| 51 | } |
| 52 | return irq; |
| 53 | } |