path: root/arch/powerpc/kernel/pci-common.c

/*
 * Contains common pci routines for ALL ppc platform
 * (based on pci_32.c and pci_64.c)
 *
 * Port for PPC64 David Engebretsen, IBM Corp.
 * Contains common pci routines for ppc64 platform, pSeries and iSeries brands.
 *
 * Copyright (C) 2003 Anton Blanchard <anton@au.ibm.com>, IBM
 *   Rework, based on alpha PCI code.
 *
 * Common pmac/prep/chrp pci routines. -- Cort
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#undef DEBUG

#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/mm.h>
#include <linux/list.h>
#include <linux/syscalls.h>
#include <linux/irq.h>
#include <linux/vmalloc.h>

#include <asm/processor.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/byteorder.h>
#include <asm/machdep.h>
#include <asm/ppc-pci.h>
#include <asm/firmware.h>
#include <asm/eeh.h>

static DEFINE_SPINLOCK(hose_spinlock);

/* XXX kill that some day ... */
static int global_phb_number;		/* Global phb counter */

/* ISA Memory physical address */
resource_size_t isa_mem_base;

/* Default PCI flags is 0 on ppc32, modified at boot on ppc64 */
unsigned int ppc_pci_flags = 0;


static struct dma_mapping_ops *pci_dma_ops;

void set_pci_dma_ops(struct dma_mapping_ops *dma_ops)
{
	pci_dma_ops = dma_ops;
}

struct dma_mapping_ops *get_pci_dma_ops(void)
{
	return pci_dma_ops;
}
EXPORT_SYMBOL(get_pci_dma_ops);

int pci_set_dma_mask(struct pci_dev *dev, u64 mask)
{
	return dma_set_mask(&dev->dev, mask);
}

int pci_set_consistent_dma_mask(struct pci_dev *dev, u64 mask)
{
	int rc;

	rc = dma_set_mask(&dev->dev, mask);
	dev->dev.coherent_dma_mask = dev->dma_mask;

	return rc;
}

struct pci_controller *pcibios_alloc_controller(struct device_node *dev)
{
	struct pci_controller *phb;

	phb = zalloc_maybe_bootmem(sizeof(struct pci_controller), GFP_KERNEL);
	if (phb == NULL)
		return NULL;
	spin_lock(&hose_spinlock);
	phb->global_number = global_phb_number++;
	list_add_tail(&phb->list_node, &hose_list);
	spin_unlock(&hose_spinlock);
	phb->dn = dev;
	phb->is_dynamic = mem_init_done;
#ifdef CONFIG_PPC64
	if (dev) {
		int nid = of_node_to_nid(dev);

		if (nid < 0 || !node_online(nid))
			nid = -1;

		PHB_SET_NODE(phb, nid);
	}
#endif
	return phb;
}

void pcibios_free_controller(struct pci_controller *phb)
{
	spin_lock(&hose_spinlock);
	list_del(&phb->list_node);
	spin_unlock(&hose_spinlock);

	if (phb->is_dynamic)
		kfree(phb);
}

int pcibios_vaddr_is_ioport(void __iomem *address)
{
	int ret = 0;
	struct pci_controller *hose;
	unsigned long size;

	spin_lock(&hose_spinlock);
	list_for_each_entry(hose, &hose_list, list_node) {
#ifdef CONFIG_PPC64
		size = hose->pci_io_size;
#else
		size = hose->io_resource.end - hose->io_resource.start + 1;
#endif
		if (address >= hose->io_base_virt &&
		    address < (hose->io_base_virt + size)) {
			ret = 1;
			break;
		}
	}
	spin_unlock(&hose_spinlock);
	return ret;
}

/*
 * Return the domain number for this bus.
 */
int pci_domain_nr(struct pci_bus *bus)
{
	struct pci_controller *hose = pci_bus_to_host(bus);

	return hose->global_number;
}
EXPORT_SYMBOL(pci_domain_nr);

#ifdef CONFIG_PPC_OF

/* This routine is meant to be used early during boot, when the
 * PCI bus numbers have not yet been assigned, and you need to
 * issue PCI config cycles to an OF device.
 * It could also be used to "fix" RTAS config cycles if you want
 * to set pci_assign_all_buses to 1 and still use RTAS for PCI
 * config cycles.
 */
struct pci_controller* pci_find_hose_for_OF_device(struct device_node* node)
{
	while(node) {
		struct pci_controller *hose, *tmp;
		list_for_each_entry_safe(hose, tmp, &hose_list, list_node)
			if (hose->dn == node)
				return hose;
		node = node->parent;
	}
	return NULL;
}

static ssize_t pci_show_devspec(struct device *dev,
		struct device_attribute *attr, char *buf)
{
	struct pci_dev *pdev;
	struct device_node *np;

	pdev = to_pci_dev (dev);
	np = pci_device_to_OF_node(pdev);
	if (np == NULL || np->full_name == NULL)
		return 0;
	return sprintf(buf, "%s", np->full_name);
}
static DEVICE_ATTR(devspec, S_IRUGO, pci_show_devspec, NULL);
#endif /* CONFIG_PPC_OF */

/* Add sysfs properties */
int pcibios_add_platform_entries(struct pci_dev *pdev)
{
#ifdef CONFIG_PPC_OF
	return device_create_file(&pdev->dev, &dev_attr_devspec);
#else
	return 0;
#endif /* CONFIG_PPC_OF */

}

char __devinit *pcibios_setup(char *str)
{
	return str;
}

/*
 * Reads the interrupt pin to determine if interrupt is use by card.
 * If the interrupt is used, then gets the interrupt line from the
 * openfirmware and sets it in the pci_dev and pci_config line.
 */
int pci_read_irq_line(struct pci_dev *pci_dev)
{
	struct of_irq oirq;
	unsigned int virq;

	/* The current device-tree that iSeries generates from the HV
	 * PCI informations doesn't contain proper interrupt routing,
	 * and all the fallback would do is print out crap, so we
	 * don't attempt to resolve the interrupts here at all, some
	 * iSeries specific fixup does it.
	 *
	 * In the long run, we will hopefully fix the generated device-tree
	 * instead.
	 */
#ifdef CONFIG_PPC_ISERIES
	if (firmware_has_feature(FW_FEATURE_ISERIES))
		return -1;
#endif

	pr_debug("PCI: Try to map irq for %s...\n", pci_name(pci_dev));

#ifdef DEBUG
	memset(&oirq, 0xff, sizeof(oirq));
#endif
	/* Try to get a mapping from the device-tree */
	if (of_irq_map_pci(pci_dev, &oirq)) {
		u8 line, pin;

		/* If that fails, lets fallback to what is in the config
		 * space and map that through the default controller. We
		 * also set the type to level low since that's what PCI
		 * interrupts are. If your platform does differently, then
		 * either provide a proper interrupt tree or don't use this
		 * function.
		 */
		if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_PIN, &pin))
			return -1;
		if (pin == 0)
			return -1;
		if (pci_read_config_byte(pci_dev, PCI_INTERRUPT_LINE, &line) ||
		    line == 0xff || line == 0) {
			return -1;
		}
		pr_debug(" No map ! Using line %d (pin %d) from PCI config\n",
			 line, pin);

		virq = irq_create_mapping(NULL, line);
		if (virq != NO_IRQ)
			set_irq_type(virq, IRQ_TYPE_LEVEL_LOW);
	} else {
		pr_debug(" Got one, spec %d cells (0x%08x 0x%08x...) on %s\n",
			 oirq.size, oirq.specifier[0], oirq.specifier[1],
		    oirq.controller->full_name);

		virq = irq_create_of_mapping(oirq.controller, oirq.specifier,
					     oirq.size);
	}
	if(virq == NO_IRQ) {
		pr_debug(" Failed to map !\n");
		return -1;
	}

	pr_debug(" Mapped to linux irq %d\n", virq);

	pci_dev->irq = virq;

	return 0;
}
EXPORT_SYMBOL(pci_read_irq_line);

/*
 * Platform support for /proc/bus/pci/X/Y mmap()s,
 * modelled on the sparc64 implementation by Dave Miller.
 *  -- paulus.
 */

/*
 * Adjust vm_pgoff of VMA such that it is the physical page offset
 * corresponding to the 32-bit pci bus offset for DEV requested by the user.
 *
 * Basically, the user finds the base address for his device which he wishes
 * to mmap.  They read the 32-bit value from the config space base register,
 * add whatever PAGE_SIZE multiple offset they wish, and feed this into the
 * offset parameter of mmap on /proc/bus/pci/XXX for that device.
 *
 * Returns negative error code on failure, zero on success.
 */
static struct resource *__pci_mmap_make_offset(struct pci_dev *dev,
					       resource_size_t *offset,
					       enum pci_mm