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https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
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ee977c2c4f
Add PCI support for the Vulcan board, supporting USB and CF ports. The PC/104 bus (actually a hack on the second CarBus slot) is not currently supported. Signed-off-by: Marc Zyngier <maz@misterjones.org> Cc: Imre Kaloz <kaloz@openwrt.org> Cc: Krzysztof Halasa <khc@pm.waw.pl> Signed-off-by: Krzysztof Hałasa <khc@pm.waw.pl>
74 lines
1.7 KiB
C
74 lines
1.7 KiB
C
/*
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* arch/arch/mach-ixp4xx/vulcan-pci.c
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*
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* Vulcan board-level PCI initialization
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*
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* Copyright (C) 2010 Marc Zyngier <maz@misterjones.org>
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*
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* based on ixdp425-pci.c:
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* Copyright (C) 2002 Intel Corporation.
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* Copyright (C) 2003-2004 MontaVista Software, Inc.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/irq.h>
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#include <asm/mach/pci.h>
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#include <asm/mach-types.h>
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/* PCI controller GPIO to IRQ pin mappings */
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#define INTA 2
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#define INTB 3
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void __init vulcan_pci_preinit(void)
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{
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#ifndef CONFIG_IXP4XX_INDIRECT_PCI
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/*
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* Cardbus bridge wants way more than the SoC can actually offer,
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* and leaves the whole PCI bus in a mess. Artificially limit it
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* to 8MB per region. Of course indirect mode doesn't have this
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* limitation...
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*/
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pci_cardbus_mem_size = SZ_8M;
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pr_info("Vulcan PCI: limiting CardBus memory size to %dMB\n",
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(int)(pci_cardbus_mem_size >> 20));
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#endif
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set_irq_type(IXP4XX_GPIO_IRQ(INTA), IRQ_TYPE_LEVEL_LOW);
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set_irq_type(IXP4XX_GPIO_IRQ(INTB), IRQ_TYPE_LEVEL_LOW);
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ixp4xx_pci_preinit();
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}
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static int __init vulcan_map_irq(struct pci_dev *dev, u8 slot, u8 pin)
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{
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if (slot == 1)
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return IXP4XX_GPIO_IRQ(INTA);
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if (slot == 2)
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return IXP4XX_GPIO_IRQ(INTB);
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return -1;
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}
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struct hw_pci vulcan_pci __initdata = {
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.nr_controllers = 1,
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.preinit = vulcan_pci_preinit,
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.swizzle = pci_std_swizzle,
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.setup = ixp4xx_setup,
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.scan = ixp4xx_scan_bus,
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.map_irq = vulcan_map_irq,
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};
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int __init vulcan_pci_init(void)
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{
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if (machine_is_arcom_vulcan())
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pci_common_init(&vulcan_pci);
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return 0;
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}
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subsys_initcall(vulcan_pci_init);
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