pci-imx6-ep-driver.c
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/*
* PCIe endpoint skeleton driver for IMX6 SOCs
*
* Copyright (C) 2014 Freescale Semiconductor, Inc. All Rights Reserved.
*
* 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.
* 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.
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/pci-aspm.h>
#include <linux/slab.h>
#include <linux/dma-mapping.h>
#include <linux/delay.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#define DRV_DESCRIPTION "i.MX PCIE endpoint device driver"
#define DRV_VERSION "version 0.1"
#define DRV_NAME "imx_pcie_ep"
struct imx_pcie_ep_priv {
struct pci_dev *pci_dev;
void __iomem *hw_base;
};
/**
* imx_pcie_ep_probe - Device Initialization Routine
* @pdev: PCI device information struct
* @id: entry in id_tbl
*
* Returns 0 on success, negative on failure
**/
static int imx_pcie_ep_probe(struct pci_dev *pdev,
const struct pci_device_id *id)
{
int ret = 0;
unsigned int msi_addr = 0;
struct device *dev = &pdev->dev;
struct imx_pcie_ep_priv *priv;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv) {
dev_err(dev, "can't alloc imx pcie priv\n");
return -ENOMEM;
}
priv->pci_dev = pdev;
if (pci_enable_device(pdev)) {
ret = -ENODEV;
goto out;
}
pci_set_master(pdev);
pci_set_drvdata(pdev, priv);
priv->hw_base = pci_iomap(pdev, 0, 0);
if (!priv->hw_base) {
ret = -ENODEV;
goto out;
}
pr_info("pci_resource_len = 0x%08llx\n",
(unsigned long long) pci_resource_len(pdev, 0));
pr_info("pci_resource_base = %p\n", priv->hw_base);
ret = pci_enable_msi(priv->pci_dev);
if (ret < 0) {
dev_err(dev, "can't enable msi\n");
return ret;
}
/*
* Force to use 0x01FF8000 on iMX6q SD board and 0x08FF8000
* on iMX6sx SDB board as the MSI address, to do the MSI demo
*/
if (*(unsigned int *)priv->hw_base > 0x4FFFFFFF)
/* iMX6sx SDB board, DDR layout [0x8000_0000 ~ 0xBFFF_FFFF] */
msi_addr = 0x08FF8000;
else
/* iMX6q SD board, DDR layout [0x1000_0000 ~ 0x4FFF_FFFF] */
msi_addr = 0x01FF8000;
pr_info("pci_msi_addr = 0x%08x\n", msi_addr);
pci_bus_write_config_dword(pdev->bus, 0, 0x54, msi_addr);
pci_bus_write_config_dword(pdev->bus->parent, 0, 0x820, msi_addr);
/* configure rc's msi cap */
pci_bus_read_config_dword(pdev->bus->parent, 0, 0x50, &ret);
ret |= (PCI_MSI_FLAGS_ENABLE << 16);
pci_bus_write_config_dword(pdev->bus->parent, 0, 0x50, ret);
pci_bus_write_config_dword(pdev->bus->parent, 0, 0x828, 0x1);
pci_bus_write_config_dword(pdev->bus->parent, 0, 0x82C, 0xFFFFFFFE);
return 0;
out:
return ret;
}
static void imx_pcie_ep_remove(struct pci_dev *pdev)
{
struct imx_pcie_ep_priv *priv = pci_get_drvdata(pdev);
if (!priv)
return;
pr_info("***imx pcie ep driver unload***\n");
}
static struct pci_device_id imx_pcie_ep_ids[] = {
{
.class = PCI_CLASS_MEMORY_RAM << 8,
.class_mask = ~0,
.vendor = 0xbeaf,
.device = 0xdead,
.subvendor = PCI_ANY_ID,
.subdevice = PCI_ANY_ID,
},
{ } /* terminate list */
};
MODULE_DEVICE_TABLE(pci, imx_pcie_ep_ids);
static struct pci_driver imx_pcie_ep_driver = {
.name = DRV_NAME,
.id_table = imx_pcie_ep_ids,
.probe = imx_pcie_ep_probe,
.remove = imx_pcie_ep_remove,
};
static int __init imx_pcie_ep_init(void)
{
int ret;
pr_info(DRV_DESCRIPTION ", " DRV_VERSION "\n");
ret = pci_register_driver(&imx_pcie_ep_driver);
if (ret)
pr_err("Unable to initialize PCI module\n");
return ret;
}
static void __exit imx_pcie_ep_exit(void)
{
pci_unregister_driver(&imx_pcie_ep_driver);
}
module_exit(imx_pcie_ep_exit);
module_init(imx_pcie_ep_init);
MODULE_DESCRIPTION(DRV_DESCRIPTION);
MODULE_VERSION(DRV_VERSION);
MODULE_LICENSE("GPL");
MODULE_ALIAS("imx_pcie_ep");