75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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#include <linux/pci.h>
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#include <linux/kernel.h>
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#include <hwregs/intr_vect.h>
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void pcibios_set_master(struct pci_dev *dev)
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{
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u8 lat;
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pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
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printk(KERN_DEBUG "PCI: Setting latency timer of device %s to %d\n", pci_name(dev), lat);
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pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
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}
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resource_size_t
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pcibios_align_resource(void *data, const struct resource *res,
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resource_size_t size, resource_size_t align)
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{
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resource_size_t start = res->start;
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if ((res->flags & IORESOURCE_IO) && (start & 0x300))
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start = (start + 0x3ff) & ~0x3ff;
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return start;
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}
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int pcibios_enable_resources(struct pci_dev *dev, int mask)
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{
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u16 cmd, old_cmd;
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int idx;
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struct resource *r;
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pci_read_config_word(dev, PCI_COMMAND, &cmd);
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old_cmd = cmd;
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for(idx=0; idx<6; idx++) {
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/* Only set up the requested stuff */
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if (!(mask & (1<<idx)))
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continue;
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r = &dev->resource[idx];
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if (!r->start && r->end) {
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printk(KERN_ERR "PCI: Device %s not available because of resource collisions\n", pci_name(dev));
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return -EINVAL;
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}
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if (r->flags & IORESOURCE_IO)
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cmd |= PCI_COMMAND_IO;
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if (r->flags & IORESOURCE_MEM)
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cmd |= PCI_COMMAND_MEMORY;
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}
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if (dev->resource[PCI_ROM_RESOURCE].start)
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cmd |= PCI_COMMAND_MEMORY;
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if (cmd != old_cmd) {
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printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, 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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int pcibios_enable_irq(struct pci_dev *dev)
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{
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dev->irq = EXT_INTR_VECT;
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return 0;
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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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int err;
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if ((err = pcibios_enable_resources(dev, mask)) < 0)
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return err;
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if (!dev->msi_enabled)
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pcibios_enable_irq(dev);
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return 0;
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}
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