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/*
* The file intends to implement the functions needed by EEH, which is
* built on IODA compliant chip. Actually, lots of functions related
* to EEH would be built based on the OPAL APIs.
*
* Copyright Benjamin Herrenschmidt & Gavin Shan, IBM Corporation 2013.
*
* 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/bootmem.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/io.h>
#include <linux/irq.h>
#include <linux/kernel.h>
#include <linux/msi.h>
#include <linux/pci.h>
#include <linux/string.h>
#include <asm/eeh.h>
#include <asm/eeh_event.h>
#include <asm/io.h>
#include <asm/iommu.h>
#include <asm/msi_bitmap.h>
#include <asm/opal.h>
#include <asm/pci-bridge.h>
#include <asm/ppc-pci.h>
#include <asm/tce.h>
#include "powernv.h"
#include "pci.h"
/**
* ioda_eeh_post_init - Chip dependent post initialization
* @hose: PCI controller
*
* The function will be called after eeh PEs and devices
* have been built. That means the EEH is ready to supply
* service with I/O cache.
*/
static int ioda_eeh_post_init(struct pci_controller *hose)
{
struct pnv_phb *phb = hose->private_data;
/* FIXME: Enable it for PHB3 later */
if (phb->type == PNV_PHB_IODA1)
phb->eeh_enabled = 1;
return 0;
}
/**
* ioda_eeh_set_option - Set EEH operation or I/O setting
* @pe: EEH PE
* @option: options
*
* Enable or disable EEH option for the indicated PE. The
* function also can be used to enable I/O or DMA for the
* PE.
*/
static int ioda_eeh_set_option(struct eeh_pe *pe, int option)
{
s64 ret;
u32 pe_no;
struct pci_controller *hose = pe->phb;
struct pnv_phb *phb = hose->private_data;
/* Check on PE number */
if (pe->addr < 0 || pe->addr >= phb->ioda.total_pe) {
pr_err("%s: PE address %x out of range [0, %x] "
"on PHB#%x\n",
__func__, pe->addr, phb->ioda.total_pe,
hose->global_number);
return -EINVAL;
}
pe_no = pe->addr;
switch (option) {
case EEH_OPT_DISABLE:
ret = -EEXIST;
break;
case EEH_OPT_ENABLE:
ret = 0;
break;
case EEH_OPT_THAW_MMIO:
ret = opal_pci_eeh_freeze_clear(phb->opal_id, pe_no,
OPAL_EEH_ACTION_CLEAR_FREEZE_MMIO);
if (ret) {
pr_warning("%s: Failed to enable MMIO for "
"PHB#%x-PE#%x, err=%lld\n",
__func__, hose->global_number, pe_no, ret);
return -EIO;
}
break;
case EEH_OPT_THAW_DMA:
ret = opal_pci_eeh_freeze_clear(phb->opal_id, pe_no,
OPAL_EEH_ACTION_CLEAR_FREEZE_DMA);
if (ret) {
pr_warning("%s: Failed to enable DMA for "
"PHB#%x-PE#%x, err=%lld\n",
__func__, hose->global_number, pe_no, ret);
return -EIO;
}
break;
default:
pr_warning("%s: Invalid option %d\n", __func__, option);
return -EINVAL;
}
return ret;
}
struct pnv_eeh_ops ioda_eeh_ops = {
.post_init = ioda_eeh_post_init,
.set_option = ioda_eeh_set_option,
.get_state = NULL,
.reset = NULL,
.get_log = NULL,
.configure_bridge = NULL,
.next_error = NULL
};
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