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89 lines
2.2 KiB
89 lines
2.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* leon_pci.c: LEON Host PCI support |
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* |
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* Copyright (C) 2011 Aeroflex Gaisler AB, Daniel Hellstrom |
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* |
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* Code is partially derived from pcic.c |
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*/ |
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#include <linux/of_device.h> |
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#include <linux/kernel.h> |
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#include <linux/pci.h> |
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#include <linux/export.h> |
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#include <asm/leon.h> |
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#include <asm/leon_pci.h> |
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/* The LEON architecture does not rely on a BIOS or bootloader to setup |
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* PCI for us. The Linux generic routines are used to setup resources, |
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* reset values of configuration-space register settings are preserved. |
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* |
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* PCI Memory and Prefetchable Memory is direct-mapped. However I/O Space is |
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* accessed through a Window which is translated to low 64KB in PCI space, the |
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* first 4KB is not used so 60KB is available. |
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*/ |
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void leon_pci_init(struct platform_device *ofdev, struct leon_pci_info *info) |
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{ |
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LIST_HEAD(resources); |
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struct pci_bus *root_bus; |
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struct pci_host_bridge *bridge; |
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int ret; |
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bridge = pci_alloc_host_bridge(0); |
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if (!bridge) |
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return; |
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pci_add_resource_offset(&resources, &info->io_space, |
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info->io_space.start - 0x1000); |
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pci_add_resource(&resources, &info->mem_space); |
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info->busn.flags = IORESOURCE_BUS; |
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pci_add_resource(&resources, &info->busn); |
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list_splice_init(&resources, &bridge->windows); |
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bridge->dev.parent = &ofdev->dev; |
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bridge->sysdata = info; |
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bridge->busnr = 0; |
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bridge->ops = info->ops; |
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bridge->swizzle_irq = pci_common_swizzle; |
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bridge->map_irq = info->map_irq; |
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ret = pci_scan_root_bus_bridge(bridge); |
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if (ret) { |
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pci_free_host_bridge(bridge); |
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return; |
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} |
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root_bus = bridge->bus; |
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/* Assign devices with resources */ |
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pci_assign_unassigned_resources(); |
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pci_bus_add_devices(root_bus); |
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} |
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int pcibios_enable_device(struct pci_dev *dev, int mask) |
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{ |
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u16 cmd, oldcmd; |
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int i; |
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pci_read_config_word(dev, PCI_COMMAND, &cmd); |
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oldcmd = cmd; |
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for (i = 0; i < PCI_NUM_RESOURCES; i++) { |
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struct resource *res = &dev->resource[i]; |
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/* Only set up the requested stuff */ |
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if (!(mask & (1<<i))) |
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continue; |
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if (res->flags & IORESOURCE_IO) |
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cmd |= PCI_COMMAND_IO; |
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if (res->flags & IORESOURCE_MEM) |
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cmd |= PCI_COMMAND_MEMORY; |
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} |
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if (cmd != oldcmd) { |
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pci_info(dev, "enabling device (%04x -> %04x)\n", oldcmd, cmd); |
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pci_write_config_word(dev, PCI_COMMAND, cmd); |
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} |
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return 0; |
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}
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