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/*
* Intel MIC Platform Software Stack (MPSS)
*
* Copyright(c) 2013 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* The full GNU General Public License is included in this distribution in
* the file called "COPYING".
*
* Intel MIC Host driver.
*
* Global TODO's across the driver to be added after initial base
* patches are accepted upstream:
* 1) Enable DMA support.
* 2) Enable per vring interrupt support.
*/
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/mic_common.h>
#include "../common/mic_device.h"
#include "mic_device.h"
#include "mic_x100.h"
#include "mic_smpt.h"
static const char mic_driver_name[] = "mic";
static DEFINE_PCI_DEVICE_TABLE(mic_pci_tbl) = {
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2250)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2251)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2252)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2253)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2254)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2255)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2256)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2257)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2258)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2259)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225a)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225b)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225c)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225d)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225e)},
/* required last entry */
{ 0, }
};
MODULE_DEVICE_TABLE(pci, mic_pci_tbl);
/* ID allocator for MIC devices */
static struct ida g_mic_ida;
/* Class of MIC devices for sysfs accessibility. */
static struct class *g_mic_class;
/* Base device node number for MIC devices */
static dev_t g_mic_devno;
/* Initialize the device page */
static int mic_dp_init(struct mic_device *mdev)
{
mdev->dp = kzalloc(MIC_DP_SIZE, GFP_KERNEL);
if (!mdev->dp) {
dev_err(mdev->sdev->parent, "%s %d err %d\n",
__func__, __LINE__, -ENOMEM);
return -ENOMEM;
}
mdev->dp_dma_addr = mic_map_single(mdev,
mdev->dp, MIC_DP_SIZE);
if (mic_map_error(mdev->dp_dma_addr)) {
kfree(mdev->dp);
dev_err(mdev->sdev->parent, "%s %d err %d\n",
__func__, __LINE__, -ENOMEM);
return -ENOMEM;
}
mdev->ops->write_spad(mdev, MIC_DPLO_SPAD, mdev->dp_dma_addr);
mdev->ops->write_spad(mdev, MIC_DPHI_SPAD, mdev->dp_dma_addr >> 32);
return 0;
}
/* Uninitialize the device page */
static void mic_dp_uninit(struct mic_device *mdev)
{
mic_unmap_single(mdev, mdev->dp_dma_addr, MIC_DP_SIZE);
kfree(mdev->dp);
}
/**
* mic_shutdown_db - Shutdown doorbell interrupt handler.
*/
static irqreturn_t mic_shutdown_db(int irq, void *data)
{
struct mic_device *mdev = data;
struct mic_bootparam *bootparam = mdev->dp;
mdev->ops->ack_interrupt(mdev);
switch (bootparam->shutdown_status) {
case MIC_HALTED:
case MIC_POWER_OFF:
case MIC_RESTART:
/* Fall through */
case MIC_CRASHED:
schedule_work(&mdev->shutdown_work);
break;
default:
break;
};
return IRQ_HANDLED;
}
/**
* mic_ops_init: Initialize HW specific operation tables.
*
* @mdev: pointer to mic_device instance
*
* returns none.
*/
static void mic_ops_init(struct mic_device *mdev)
{
switch (mdev->family) {
case MIC_FAMILY_X100:
mdev->ops = &mic_x100_ops;
mdev->intr_ops = &mic_x100_intr_ops;
mdev->smpt_ops = &mic_x100_smpt_ops;
break;
default:
break;
}
}
/**
* mic_get_family - Determine hardware family to which this MIC belongs.
*
* @pdev: The pci device structure
*
* returns family.
*/
static enum mic_hw_family mic_get_family(struct pci_dev *pdev)
{
enum mic_hw_family family;
switch (pdev->device) {
case MIC_X100_PCI_DEVICE_2250:
case MIC_X100_PCI_DEVICE_2251:
case MIC_X100_PCI_DEVICE_2252:
case MIC_X100_PCI_DEVICE_2253:
case MIC_X100_PCI_DEVICE_2254:
case MIC_X100_PCI_DEVICE_2255:
case MIC_X100_PCI_DEVICE_2256:
case MIC_X100_PCI_DEVICE_2257:
case MIC_X100_PCI_DEVICE_2258:
case MIC_X100_PCI_DEVICE_2259:
case MIC_X100_PCI_DEVICE_225a:
case MIC_X100_PCI_DEVICE_225b:
case MIC_X100_PCI_DEVICE_225c:
case MIC_X100_PCI_DEVICE_225d:
case MIC_X100_PCI_DEVICE_225e:
family = MIC_FAMILY_X100;
break;
default:
family = MIC_FAMILY_UNKNOWN;
break;
}
return family;
}
/**
* mic_device_init - Allocates and initializes the MIC device structure
*
* @mdev: pointer to mic_device instance
* @pdev: The pci device structure
*
* returns none.
*/
static void
mic_device_init(struct mic_device *mdev, struct pci_dev *pdev)
{
mdev->family = mic_get_family(pdev);
mdev->stepping = pdev->revision;
mic_ops_init(mdev);
mic_sysfs_init(mdev);
mutex_init(&mdev->mic_mutex);
mdev->irq_info.next_avail_src = 0;
INIT_WORK(&mdev->reset_trigger_work, mic_reset_trigger_work);
INIT_WORK(&mdev->shutdown_work, mic_shutdown_work);
}
/**
* mic_device_uninit - Frees resources allocated during mic_device_init(..)
*
* @mdev: pointer to mic_device instance
*
* returns none
*/
static void mic_device_uninit(struct mic_device *mdev)
{
/* The cmdline sysfs entry might have allocated cmdline */
kfree(mdev->cmdline);
kfree(mdev->firmware);
kfree(mdev->ramdisk);
kfree(mdev->bootmode);
flush_work(&mdev->reset_trigger_work);
flush_work(&mdev->shutdown_work);
}
/**
* mic_probe - Device Initialization Routine
*
* @pdev: PCI device structure
* @ent: entry in mic_pci_tbl
*
* returns 0 on success, < 0 on failure.
*/
static int mic_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
int rc;
struct mic_device *mdev;
mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
if (!mdev) {
rc = -ENOMEM;
dev_err(&pdev->dev, "mdev kmalloc failed rc %d\n", rc);
goto mdev_alloc_fail;
}
mdev->id = ida_simple_get(&g_mic_ida, 0, MIC_MAX_NUM_DEVS, GFP_KERNEL);
if (mdev->id < 0) {
rc = mdev->id;
dev_err(&pdev->dev, "ida_simple_get failed rc %d\n", rc);
goto ida_fail;
}
mic_device_init(mdev, pdev);
rc = pci_enable_device(pdev);
if (rc) {
dev_err(&pdev->dev, "failed to enable pci device.\n");
goto uninit_device;
}
pci_set_master(pdev);
rc = pci_request_regions(pdev, mic_driver_name);
if (rc) {
dev_err(&pdev->dev, "failed to get pci regions.\n");
goto disable_device;
}
rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
if (rc) {
dev_err(&pdev->dev, "Cannot set DMA mask\n");
goto release_regions;
}
mdev->mmio.pa = pci_resource_start(pdev, mdev->ops->mmio_bar);
mdev->mmio.len = pci_resource_len(pdev, mdev->ops->mmio_bar);
mdev->mmio.va = pci_ioremap_bar(pdev, mdev->ops->mmio_bar);
if (!mdev->mmio.va) {
dev_err(&pdev->dev, "Cannot remap MMIO BAR\n");
rc = -EIO;
goto release_regions;
}
mdev->aper.pa = pci_resource_start(pdev, mdev->ops->aper_bar);
mdev->aper.len = pci_resource_len(pdev, mdev->ops->aper_bar);
mdev->aper.va = ioremap_wc(mdev->aper.pa, mdev->aper.len);
if (!mdev->aper
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