/*
* Support PCI/PCIe on PowerNV platforms
*
* Currently supports only P5IOC2
*
* Copyright 2011 Benjamin Herrenschmidt, IBM Corp.
*
* 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.
*/
#include <linux/kernel.h>
#include <linux/pci.h>
#include <linux/delay.h>
#include <linux/string.h>
#include <linux/init.h>
#include <linux/bootmem.h>
#include <linux/irq.h>
#include <linux/io.h>
#include <linux/msi.h>
#include <linux/iommu.h>
#include <asm/sections.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/pci-bridge.h>
#include <asm/machdep.h>
#include <asm/msi_bitmap.h>
#include <asm/ppc-pci.h>
#include <asm/opal.h>
#include <asm/iommu.h>
#include <asm/tce.h>
#include <asm/firmware.h>
#include <asm/eeh_event.h>
#include <asm/eeh.h>
#include "powernv.h"
#include "pci.h"
/* Delay in usec */
#define PCI_RESET_DELAY_US 3000000
#define cfg_dbg(fmt...) do { } while(0)
//#define cfg_dbg(fmt...) printk(fmt)
#ifdef CONFIG_PCI_MSI
static int pnv_msi_check_device(struct pci_dev* pdev, int nvec, int type)
{
struct pci_controller *hose = pci_bus_to_host(pdev->bus);
struct pnv_phb *phb = hose->private_data;
struct pci_dn *pdn = pci_get_pdn(pdev);
if (pdn && pdn->force_32bit_msi && !phb->msi32_support)
return -ENODEV;
return (phb && phb->msi_bmp.bitmap) ? 0 : -ENODEV;
}
static int pnv_setup_msi_irqs(struct pci_dev *pdev, int nvec, int type)
{
struct pci_controller *hose = pci_bus_to_host(pdev->bus);
struct pnv_phb *phb = hose->private_data;
struct msi_desc *entry;
struct msi_msg msg;
int hwirq;
unsigned int virq;
int rc;
if (WARN_ON(!phb))
return -ENODEV;
list_for_each_entry(entry, &pdev->msi_list, list) {
if (!entry->msi_attrib.is_64 && !phb->msi32_support) {
pr_warn("%s: Supports only 64-bit MSIs\n",
pci_name(pdev));
return -ENXIO;
}
hwirq = msi_bitmap_alloc_hwirqs(&phb->msi_bmp, 1);
if (hwirq < 0) {
pr_warn("%s: Failed to find a free MSI\n",
pci_name(pdev));
return -ENOSPC;
}
virq = irq_create_mapping(NULL, phb->msi_base + hwirq);
if (virq == NO_IRQ) {
pr_warn("%s: Failed to map MSI to linux irq\n",
pci_name(pdev));
msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq, 1);
return -ENOMEM;
}
rc = phb->msi_setup(phb, pdev, phb->msi_base + hwirq,
virq, entry->msi_attrib.is_64, &msg);
if (rc) {
pr_warn("%s: Failed to setup MSI\n", pci_name(pdev));
irq_dispose_mapping(virq);
msi_bitmap_free_hwirqs(&phb->msi_bmp, hwirq, 1);
return rc;
}
irq_set_msi_desc(virq, entry);
write_msi_msg(virq, &msg);
}
return 0;
}
static void pnv_teardown_msi_irqs(struct pci_dev *pdev)
{
struct pci_controller *hose = pci_bus_to_host(pdev->bus);
struct pnv_phb *phb = hose->private_data;
struct msi_desc *entry;
if (WARN_ON(!phb))
return;
list_for_each_entry(entry, &pdev->msi_list, list) {
if (entry->irq == NO_IRQ)
continue;
irq_set_msi_desc(entry->irq, NULL);
msi_bitmap_free_hwirqs(&phb->msi_bmp,
virq_to_hw(entry->irq) - phb->msi_base, 1);
irq_dispose_mapping(entry->irq);
}
}
#endif /* CONFIG_PCI_MSI */
static void pnv_pci_dump_p7ioc_diag_data(struct pci_controller *hose,
struct OpalIoPhbErrorCommon *common)
{
struct OpalIoP7IOCPhbErrorData *data;
int i;
data = (struct OpalIoP7IOCPhbErrorData *)common;
pr_info("P7IOC PHB#%d Diag-data (Version: %d)\n",
hose->global_number, be32_to_cpu(common->version));
if (data->brdgCtl)
pr_info("brdgCtl: %08x\n",
be32_to_cpu(data->brdgCtl));
if (data->portStatusReg || data->rootCmplxStatus ||
data->busAgentStatus)
pr_info("UtlSts: %08x %08x %08x\n",
be32_to_cpu(data->portStatusReg),
be32_to_cpu(data->rootCmplxStatus),
be32_to_cpu(data->busAgentStatus));
if (data->deviceStatus || data->slotStatus ||
data->linkStatus || data->devCmdStatus ||
data->devSecStatus)
pr_info("RootSts: %08x %08x %08x %08x %08x\n",
be32_to_cpu(data->deviceStatus),
be32_to_cpu(data->slotStatus),
be32_to_cpu<