arch/cris/arch-v32/drivers/pci/bios.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/pci.h>
   3 #include <linux/kernel.h>
   4 #include <hwregs/intr_vect.h>
   5
   6 void pcibios_set_master(struct pci_dev *dev)
   7 {
   8         u8 lat;
   9         pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
  10         printk(KERN_DEBUG "PCI: Setting latency timer of device %s to %d\n", pci_name(dev), lat);
  11         pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
  12 }
  13
  14 resource_size_t
  15 pcibios_align_resource(void *data, const struct resource *res,
  16                        resource_size_t size, resource_size_t align)
  17 {
  18         resource_size_t start = res->start;
  19
  20         if ((res->flags & IORESOURCE_IO) && (start & 0x300))
  21                 start = (start + 0x3ff) & ~0x3ff;
  22
  23         return start;
  24 }
  25
  26 int pcibios_enable_resources(struct pci_dev *dev, int mask)
  27 {
  28         u16 cmd, old_cmd;
  29         int idx;
  30         struct resource *r;
  31
  32         pci_read_config_word(dev, PCI_COMMAND, &cmd);
  33         old_cmd = cmd;
  34         for(idx=0; idx<6; idx++) {
  35                 /* Only set up the requested stuff */
  36                 if (!(mask & (1<<idx)))
  37                         continue;
  38
  39                 r = &dev->resource[idx];
  40                 if (!r->start && r->end) {
  41                         printk(KERN_ERR "PCI: Device %s not available because of resource collisions\n", pci_name(dev));
  42                         return -EINVAL;
  43                 }
  44                 if (r->flags & IORESOURCE_IO)
  45                         cmd |= PCI_COMMAND_IO;
  46                 if (r->flags & IORESOURCE_MEM)
  47                         cmd |= PCI_COMMAND_MEMORY;
  48         }
  49         if (dev->resource[PCI_ROM_RESOURCE].start)
  50                 cmd |= PCI_COMMAND_MEMORY;
  51         if (cmd != old_cmd) {
  52                 printk("PCI: Enabling device %s (%04x -> %04x)\n", pci_name(dev), old_cmd, cmd);
  53                 pci_write_config_word(dev, PCI_COMMAND, cmd);
  54         }
  55         return 0;
  56 }
  57
  58 int pcibios_enable_irq(struct pci_dev *dev)
  59 {
  60         dev->irq = EXT_INTR_VECT;
  61         return 0;
  62 }
  63
  64 int pcibios_enable_device(struct pci_dev *dev, int mask)
  65 {
  66         int err;
  67
  68         if ((err = pcibios_enable_resources(dev, mask)) < 0)
  69                 return err;
  70
  71         if (!dev->msi_enabled)
  72                 pcibios_enable_irq(dev);
  73         return 0;
  74 }