--- /dev/null
+/*
+ * New-style PCI core.
+ *
+ * Copyright (c) 2002 M. R. Brown
+ * Copyright (c) 2004 - 2009 Paul Mundt
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/kernel.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+#include <linux/dma-debug.h>
+#include <linux/io.h>
+
+static int __init pcibios_init(void)
+{
+ struct pci_channel *p;
+ struct pci_bus *bus;
+ int busno;
+
+ /* init channels */
+ busno = 0;
+ for (p = board_pci_channels; p->init; p++) {
+ if (p->init(p) == 0)
+ p->enabled = 1;
+ else
+ pr_err("Unable to init pci channel %d\n", busno);
+ busno++;
+ }
+
+ /* scan the buses */
+ busno = 0;
+ for (p = board_pci_channels; p->init; p++) {
+ if (p->enabled) {
+ bus = pci_scan_bus(busno, p->pci_ops, p);
+ busno = bus->subordinate + 1;
+
+ pci_bus_size_bridges(bus);
+ pci_bus_assign_resources(bus);
+ pci_enable_bridges(bus);
+ }
+ }
+
+ pci_fixup_irqs(pci_common_swizzle, pcibios_map_platform_irq);
+
+ dma_debug_add_bus(&pci_bus_type);
+
+ return 0;
+}
+subsys_initcall(pcibios_init);
+
+static void pcibios_fixup_device_resources(struct pci_dev *dev,
+ struct pci_bus *bus)
+{
+ /* Update device resources. */
+ struct pci_channel *chan = bus->sysdata;
+ unsigned long offset = 0;
+ int i;
+
+ for (i = 0; i < PCI_NUM_RESOURCES; i++) {
+ if (!dev->resource[i].start)
+ continue;
+ if (dev->resource[i].flags & IORESOURCE_PCI_FIXED)
+ continue;
+ if (dev->resource[i].flags & IORESOURCE_IO)
+ offset = chan->io_base;
+ else if (dev->resource[i].flags & IORESOURCE_MEM)
+ offset = 0;
+
+ dev->resource[i].start += offset;
+ dev->resource[i].end += offset;
+ }
+}
+
+
+/*
+ * Called after each bus is probed, but before its children
+ * are examined.
+ */
+void __devinit __weak pcibios_fixup_bus(struct pci_bus *bus)
+{
+ struct pci_dev *dev = bus->self;
+ struct list_head *ln;
+ struct pci_channel *chan = bus->sysdata;
+
+ if (!dev) {
+ bus->resource[0] = chan->io_resource;
+ bus->resource[1] = chan->mem_resource;
+ }
+
+ for (ln = bus->devices.next; ln != &bus->devices; ln = ln->next) {
+ dev = pci_dev_b(ln);
+
+ if ((dev->class >> 8) != PCI_CLASS_BRIDGE_PCI)
+ pcibios_fixup_device_resources(dev, bus);
+ }
+}
+
+void pcibios_resource_to_bus(struct pci_dev *dev, struct pci_bus_region *region,
+ struct resource *res)
+{
+ struct pci_channel *chan = dev->sysdata;
+ unsigned long offset = 0;
+
+ if (res->flags & IORESOURCE_IO)
+ offset = chan->io_base;
+ else if (res->flags & IORESOURCE_MEM)
+ offset = 0;
+
+ region->start = res->start - offset;
+ region->end = res->end - offset;
+}
+
+void __devinit
+pcibios_bus_to_resource(struct pci_dev *dev, struct resource *res,
+ struct pci_bus_region *region)
+{
+ struct pci_channel *chan = dev->sysdata;
+ unsigned long offset = 0;
+
+ if (res->flags & IORESOURCE_IO)
+ offset = chan->io_base;
+ else if (res->flags & IORESOURCE_MEM)
+ offset = 0;
+
+ res->start = region->start + offset;
+ res->end = region->end + offset;
+}
+
+void pcibios_align_resource(void *data, struct resource *res,
+ resource_size_t size, resource_size_t align)
+ __attribute__ ((weak));
+
+/*
+ * We need to avoid collisions with `mirrored' VGA ports
+ * and other strange ISA hardware, so we always want the
+ * addresses to be allocated in the 0x000-0x0ff region
+ * modulo 0x400.
+ */
+void pcibios_align_resource(void *data, struct resource *res,
+ resource_size_t size, resource_size_t align)
+{
+ if (res->flags & IORESOURCE_IO) {
+ resource_size_t start = res->start;
+
+ if (start & 0x300) {
+ start = (start + 0x3ff) & ~0x3ff;
+ res->start = start;
+ }
+ }
+}
+
+int pcibios_enable_device(struct pci_dev *dev, int mask)
+{
+ u16 cmd, old_cmd;
+ int idx;
+ struct resource *r;
+
+ pci_read_config_word(dev, PCI_COMMAND, &cmd);
+ old_cmd = cmd;
+ for(idx=0; idx<6; idx++) {
+ if (!(mask & (1 << idx)))
+ continue;
+ r = &dev->resource[idx];
+ if (!r->start && r->end) {
+ printk(KERN_ERR "PCI: Device %s not available because "
+ "of resource collisions\n", pci_name(dev));
+ return -EINVAL;
+ }
+ if (r->flags & IORESOURCE_IO)
+ cmd |= PCI_COMMAND_IO;
+ if (r->flags & IORESOURCE_MEM)
+ cmd |= PCI_COMMAND_MEMORY;
+ }
+ if (dev->resource[PCI_ROM_RESOURCE].start)
+ cmd |= PCI_COMMAND_MEMORY;
+ if (cmd != old_cmd) {
+ printk(KERN_INFO "PCI: Enabling device %s (%04x -> %04x)\n",
+ pci_name(dev), old_cmd, cmd);
+ pci_write_config_word(dev, PCI_COMMAND, cmd);
+ }
+ return 0;
+}
+
+/*
+ * If we set up a device for bus mastering, we need to check and set
+ * the latency timer as it may not be properly set.
+ */
+static unsigned int pcibios_max_latency = 255;
+
+void pcibios_set_master(struct pci_dev *dev)
+{
+ u8 lat;
+ pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
+ if (lat < 16)
+ lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;
+ else if (lat > pcibios_max_latency)
+ lat = pcibios_max_latency;
+ else
+ return;
+ printk(KERN_INFO "PCI: Setting latency timer of device %s to %d\n",
+ pci_name(dev), lat);
+ pci_write_config_byte(dev, PCI_LATENCY_TIMER, lat);
+}
+
+void __init pcibios_update_irq(struct pci_dev *dev, int irq)
+{
+ pci_write_config_byte(dev, PCI_INTERRUPT_LINE, irq);
+}
+
+void __iomem *pci_iomap(struct pci_dev *dev, int bar, unsigned long maxlen)
+{
+ resource_size_t start = pci_resource_start(dev, bar);
+ resource_size_t len = pci_resource_len(dev, bar);
+ unsigned long flags = pci_resource_flags(dev, bar);
+
+ if (unlikely(!len || !start))
+ return NULL;
+ if (maxlen && len > maxlen)
+ len = maxlen;
+
+ /*
+ * Presently the IORESOURCE_MEM case is a bit special, most
+ * SH7751 style PCI controllers have PCI memory at a fixed
+ * location in the address space where no remapping is desired.
+ * With the IORESOURCE_MEM case more care has to be taken
+ * to inhibit page table mapping for legacy cores, but this is
+ * punted off to __ioremap().
+ * -- PFM.
+ */
+ if (flags & IORESOURCE_IO)
+ return ioport_map(start, len);
+ if (flags & IORESOURCE_MEM)
+ return ioremap(start, len);
+
+ return NULL;
+}
+EXPORT_SYMBOL(pci_iomap);
+
+void pci_iounmap(struct pci_dev *dev, void __iomem *addr)
+{
+ iounmap(addr);
+}
+EXPORT_SYMBOL(pci_iounmap);
+
+EXPORT_SYMBOL(board_pci_channels);
projects / linux-beck.git / commitdiff