| b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * arch/arch/mach-ixp4xx/vulcan-pci.c |
| 4 | * |
| 5 | * Vulcan board-level PCI initialization |
| 6 | * |
| 7 | * Copyright (C) 2010 Marc Zyngier <maz@misterjones.org> |
| 8 | * |
| 9 | * based on ixdp425-pci.c: |
| 10 | * Copyright (C) 2002 Intel Corporation. |
| 11 | * Copyright (C) 2003-2004 MontaVista Software, Inc. |
| 12 | */ |
| 13 | |
| 14 | #include <linux/pci.h> |
| 15 | #include <linux/init.h> |
| 16 | #include <linux/irq.h> |
| 17 | #include <asm/mach/pci.h> |
| 18 | #include <asm/mach-types.h> |
| 19 | |
| 20 | #include "irqs.h" |
| 21 | |
| 22 | /* PCI controller GPIO to IRQ pin mappings */ |
| 23 | #define INTA 2 |
| 24 | #define INTB 3 |
| 25 | |
| 26 | void __init vulcan_pci_preinit(void) |
| 27 | { |
| 28 | #ifndef CONFIG_IXP4XX_INDIRECT_PCI |
| 29 | /* |
| 30 | * Cardbus bridge wants way more than the SoC can actually offer, |
| 31 | * and leaves the whole PCI bus in a mess. Artificially limit it |
| 32 | * to 8MB per region. Of course indirect mode doesn't have this |
| 33 | * limitation... |
| 34 | */ |
| 35 | pci_cardbus_mem_size = SZ_8M; |
| 36 | pr_info("Vulcan PCI: limiting CardBus memory size to %dMB\n", |
| 37 | (int)(pci_cardbus_mem_size >> 20)); |
| 38 | #endif |
| 39 | irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW); |
| 40 | irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW); |
| 41 | ixp4xx_pci_preinit(); |
| 42 | } |
| 43 | |
| 44 | static int __init vulcan_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) |
| 45 | { |
| 46 | if (slot == 1) |
| 47 | return IXP4XX_GPIO_IRQ(INTA); |
| 48 | |
| 49 | if (slot == 2) |
| 50 | return IXP4XX_GPIO_IRQ(INTB); |
| 51 | |
| 52 | return -1; |
| 53 | } |
| 54 | |
| 55 | struct hw_pci vulcan_pci __initdata = { |
| 56 | .nr_controllers = 1, |
| 57 | .ops = &ixp4xx_ops, |
| 58 | .preinit = vulcan_pci_preinit, |
| 59 | .setup = ixp4xx_setup, |
| 60 | .map_irq = vulcan_map_irq, |
| 61 | }; |
| 62 | |
| 63 | int __init vulcan_pci_init(void) |
| 64 | { |
| 65 | if (machine_is_arcom_vulcan()) |
| 66 | pci_common_init(&vulcan_pci); |
| 67 | return 0; |
| 68 | } |
| 69 | |
| 70 | subsys_initcall(vulcan_pci_init); |