path: root/arch/s390/pci/pci.c

/*
 * Copyright IBM Corp. 2012
 *
 * Author(s):
 *   Jan Glauber <jang@linux.vnet.ibm.com>
 *
 * The System z PCI code is a rewrite from a prototype by
 * the following people (Kudoz!):
 *   Alexander Schmidt
 *   Christoph Raisch
 *   Hannes Hering
 *   Hoang-Nam Nguyen
 *   Jan-Bernd Themann
 *   Stefan Roscher
 *   Thomas Klein
 */

#define COMPONENT "zPCI"
#define pr_fmt(fmt) COMPONENT ": " fmt

#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/delay.h>
#include <linux/irq.h>
#include <linux/kernel_stat.h>
#include <linux/seq_file.h>
#include <linux/pci.h>
#include <linux/msi.h>

#include <asm/isc.h>
#include <asm/airq.h>
#include <asm/facility.h>
#include <asm/pci_insn.h>
#include <asm/pci_clp.h>
#include <asm/pci_dma.h>

#define DEBUG				/* enable pr_debug */

#define	SIC_IRQ_MODE_ALL		0
#define	SIC_IRQ_MODE_SINGLE		1

#define ZPCI_NR_DMA_SPACES		1
#define ZPCI_NR_DEVICES			CONFIG_PCI_NR_FUNCTIONS

/* list of all detected zpci devices */
static LIST_HEAD(zpci_list);
static DEFINE_SPINLOCK(zpci_list_lock);

static void zpci_enable_irq(struct irq_data *data);
static void zpci_disable_irq(struct irq_data *data);

static struct irq_chip zpci_irq_chip = {
	.name = "zPCI",
	.irq_unmask = zpci_enable_irq,
	.irq_mask = zpci_disable_irq,
};

static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES);
static DEFINE_SPINLOCK(zpci_domain_lock);

static struct airq_iv *zpci_aisb_iv;
static struct airq_iv *zpci_aibv[ZPCI_NR_DEVICES];

/* Adapter interrupt definitions */
static void zpci_irq_handler(struct airq_struct *airq);

static struct airq_struct zpci_airq = {
	.handler = zpci_irq_handler,
	.isc = PCI_ISC,
};

/* I/O Map */
static DEFINE_SPINLOCK(zpci_iomap_lock);
static DECLARE_BITMAP(zpci_iomap, ZPCI_IOMAP_MAX_ENTRIES);
struct zpci_iomap_entry *zpci_iomap_start;
EXPORT_SYMBOL_GPL(zpci_iomap_start);

static struct kmem_cache *zdev_fmb_cache;

struct zpci_dev *get_zdev(struct pci_dev *pdev)
{
	return (struct zpci_dev *) pdev->sysdata;
}

struct zpci_dev *get_zdev_by_fid(u32 fid)
{
	struct zpci_dev *tmp, *zdev = NULL;

	spin_lock(&zpci_list_lock);
	list_for_each_entry(tmp, &zpci_list, entry) {
		if (tmp->fid == fid) {
			zdev = tmp;
			break;
		}
	}
	spin_unlock(&zpci_list_lock);
	return zdev;
}

static struct zpci_dev *get_zdev_by_bus(struct pci_bus *bus)
{
	return (bus && bus->sysdata) ? (struct zpci_dev *) bus->sysdata : NULL;
}

int pci_domain_nr(struct pci_bus *bus)
{
	return ((struct zpci_dev *) bus->sysdata)->domain;
}
EXPORT_SYMBOL_GPL(pci_domain_nr);

int pci_proc_domain(struct pci_bus *bus)
{
	return pci_domain_nr(bus);
}
EXPORT_SYMBOL_GPL(pci_proc_domain);

/* Modify PCI: Register adapter interruptions */
static int zpci_set_airq(struct zpci_dev *zdev)
{
	u64 req = ZPCI_CREATE_REQ(zdev->fh, 0, ZPCI_MOD_FC_REG_INT);
	struct zpci_fib *fib;
	int rc;

	fib = (void *) get_zeroed_page(GFP_KERNEL);
	if (!fib)
		return -ENOMEM;

	fib->isc = PCI_ISC;
	fib->sum = 1;		/* enable summary notifications */
	fib->noi = airq_iv_end(zdev->aibv);
	fib->aibv = (unsigned long) zdev->aibv->vector;
	fib->aibvo = 0;		/* each zdev has its own interrupt vector */
	fib->aisb = (unsigned long) zpci_aisb_iv->vector + (zdev->aisb/64)*8;
	fib->aisbo = zdev->aisb & 63;

	rc = zpci_mod_fc(req, fib);
	pr_debug("%s mpcifc returned noi: %d\n", __func__, fib->noi);

	free_page((unsigned long) fib);
	return rc;
}

struct mod_pci_args {
	u64 base;
	u64 limit;
	u64 iota;
	u64 fmb_addr;
};

static int mod_pci(struct zpci_dev *zdev, int fn, u8 dmaas, struct mod_pci_args *args)
{
	u64 req = ZPCI_CREATE_REQ(zdev->fh, dmaas, fn);
	struct zpci_fib *fib;
	int rc;

	/* The FIB must be available even if it's not used */
	fib = (void *) get_zeroed_page(GFP_KERNEL);
	if (!fib)
		return -ENOMEM;

	fib->pba = args->base;
	fib->pal = args->limit;
	fib->iota = args->iota;
	fib->fmb_addr = args->fmb_addr;

	rc = zpci_mod_fc(req, fib);
	free_page((unsigned long) fib);