Thomas Gleixner | d2912cb | 2019-06-04 10:11:33 +0200 | [diff] [blame^] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Alessandro Zummo | a7918f3 | 2005-11-10 14:05:04 +0000 | [diff] [blame] | 2 | /* |
| 3 | * arch/arm/mach-ixp4xx/nslu2-pci.c |
| 4 | * |
| 5 | * NSLU2 board-level PCI initialization |
| 6 | * |
| 7 | * based on ixdp425-pci.c: |
| 8 | * Copyright (C) 2002 Intel Corporation. |
| 9 | * Copyright (C) 2003-2004 MontaVista Software, Inc. |
| 10 | * |
| 11 | * Maintainer: http://www.nslu2-linux.org/ |
Alessandro Zummo | a7918f3 | 2005-11-10 14:05:04 +0000 | [diff] [blame] | 12 | */ |
| 13 | |
Alessandro Zummo | a7918f3 | 2005-11-10 14:05:04 +0000 | [diff] [blame] | 14 | #include <linux/pci.h> |
| 15 | #include <linux/init.h> |
Martin Michlmayr | f64c2c0 | 2006-09-06 19:03:24 +0100 | [diff] [blame] | 16 | #include <linux/irq.h> |
Alessandro Zummo | a7918f3 | 2005-11-10 14:05:04 +0000 | [diff] [blame] | 17 | #include <asm/mach/pci.h> |
| 18 | #include <asm/mach-types.h> |
| 19 | |
Linus Walleij | dc8ef8cd | 2018-12-29 15:47:52 +0100 | [diff] [blame] | 20 | #include "irqs.h" |
| 21 | |
Krzysztof Hałasa | 8d3fdf3 | 2009-11-17 18:48:23 +0100 | [diff] [blame] | 22 | #define MAX_DEV 3 |
| 23 | #define IRQ_LINES 3 |
Krzysztof Hałasa | c1117c6 | 2009-11-16 16:02:02 +0100 | [diff] [blame] | 24 | |
| 25 | /* PCI controller GPIO to IRQ pin mappings */ |
Krzysztof Hałasa | 8d3fdf3 | 2009-11-17 18:48:23 +0100 | [diff] [blame] | 26 | #define INTA 11 |
| 27 | #define INTB 10 |
| 28 | #define INTC 9 |
| 29 | #define INTD 8 |
Krzysztof Hałasa | c1117c6 | 2009-11-16 16:02:02 +0100 | [diff] [blame] | 30 | |
Alessandro Zummo | a7918f3 | 2005-11-10 14:05:04 +0000 | [diff] [blame] | 31 | void __init nslu2_pci_preinit(void) |
| 32 | { |
Thomas Gleixner | 6845664a | 2011-03-24 13:25:22 +0100 | [diff] [blame] | 33 | irq_set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW); |
| 34 | irq_set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW); |
| 35 | irq_set_irq_type(IXP4XX_GPIO_IRQ(INTC), IRQ_TYPE_LEVEL_LOW); |
Alessandro Zummo | a7918f3 | 2005-11-10 14:05:04 +0000 | [diff] [blame] | 36 | ixp4xx_pci_preinit(); |
| 37 | } |
| 38 | |
Ralf Baechle | d534194 | 2011-06-10 15:30:21 +0100 | [diff] [blame] | 39 | static int __init nslu2_map_irq(const struct pci_dev *dev, u8 slot, u8 pin) |
Alessandro Zummo | a7918f3 | 2005-11-10 14:05:04 +0000 | [diff] [blame] | 40 | { |
Krzysztof Hałasa | 8d3fdf3 | 2009-11-17 18:48:23 +0100 | [diff] [blame] | 41 | static int pci_irq_table[IRQ_LINES] = { |
| 42 | IXP4XX_GPIO_IRQ(INTA), |
| 43 | IXP4XX_GPIO_IRQ(INTB), |
| 44 | IXP4XX_GPIO_IRQ(INTC), |
Alessandro Zummo | a7918f3 | 2005-11-10 14:05:04 +0000 | [diff] [blame] | 45 | }; |
| 46 | |
Krzysztof Hałasa | 8d3fdf3 | 2009-11-17 18:48:23 +0100 | [diff] [blame] | 47 | if (slot >= 1 && slot <= MAX_DEV && pin >= 1 && pin <= IRQ_LINES) |
| 48 | return pci_irq_table[(slot + pin - 2) % IRQ_LINES]; |
Alessandro Zummo | a7918f3 | 2005-11-10 14:05:04 +0000 | [diff] [blame] | 49 | |
Krzysztof Hałasa | 8d3fdf3 | 2009-11-17 18:48:23 +0100 | [diff] [blame] | 50 | return -1; |
Alessandro Zummo | a7918f3 | 2005-11-10 14:05:04 +0000 | [diff] [blame] | 51 | } |
| 52 | |
| 53 | struct hw_pci __initdata nslu2_pci = { |
| 54 | .nr_controllers = 1, |
Russell King | c23bfc3 | 2012-03-10 12:49:16 +0000 | [diff] [blame] | 55 | .ops = &ixp4xx_ops, |
Alessandro Zummo | a7918f3 | 2005-11-10 14:05:04 +0000 | [diff] [blame] | 56 | .preinit = nslu2_pci_preinit, |
Alessandro Zummo | a7918f3 | 2005-11-10 14:05:04 +0000 | [diff] [blame] | 57 | .setup = ixp4xx_setup, |
Alessandro Zummo | a7918f3 | 2005-11-10 14:05:04 +0000 | [diff] [blame] | 58 | .map_irq = nslu2_map_irq, |
| 59 | }; |
| 60 | |
| 61 | int __init nslu2_pci_init(void) /* monkey see, monkey do */ |
| 62 | { |
| 63 | if (machine_is_nslu2()) |
| 64 | pci_common_init(&nslu2_pci); |
| 65 | |
| 66 | return 0; |
| 67 | } |
| 68 | |
| 69 | subsys_initcall(nslu2_pci_init); |