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