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// SPDX-License-Identifier: GPL-2.0-only
/*
* IMX MIC Platform Software Stack
*
* Copyright(c) 2020 NXP.
*
* Intel MIC Host driver.
*/
#include "imx_mic_main.h"
static const char imx_mic_driver_name[] = "imx_mic";
static const struct pci_device_id imx_mic_pci_tbl[] = {
{PCI_DEVICE(PCI_VENDOR_ID_FREESCALE, PCI_DEVICE_ID_IMX_MIC)},
/* required last entry */
{ 0, }
};
MODULE_DEVICE_TABLE(pci, imx_mic_pci_tbl);
/* ID allocator for MIC devices */
static struct ida g_imx_mic_ida;
/* Initialize the MIC bootparams */
static void imx_mic_bootparam_init(struct imx_mic_device *mdev)
{
struct mic_bootparam *bootparam = mdev->dp;
bootparam->magic = cpu_to_le32(MIC_MAGIC);
bootparam->h2c_config_db = -1;
bootparam->node_id = mdev->id + 1;
}
static int find_cma(struct cma *cma, void *p)
{
if (strcmp(cma_get_name(cma), "fsl,imx_mic") == 0)
*((struct cma **)p) = cma;
return 0;
}
/**
* imx_mic_probe - Device Initialization Routine
*
* @pdev: PCI device structure
* @ent: entry in imx_mic_pci_tbl
*
* returns 0 on success, < 0 on failure.
*/
static int imx_mic_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
int rc;
struct imx_mic_device *mdev;
struct cma *cma = NULL;
dma_addr_t dp_dma_addr;
void *dp_va;
void __iomem *temp_bar_base;
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_imx_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;
}
mdev->pdev = pdev;
mdev->family = MIC_FAMILY_IMX8;
mdev->stepping = pdev->revision;
rc = pci_enable_device(pdev);
if (rc) {
dev_err(&pdev->dev, "failed to enable pci device.\n");
goto ida_remove;
}
pci_set_master(pdev);
rc = pci_request_regions(pdev, imx_mic_driver_name);
if (rc) {
dev_err(&pdev->dev, "failed to get pci regions.\n");
goto disable_device;
}
/* card MU registers */
mdev->mmio.pa = pci_resource_start(pdev, IMX_MIC_MMIO_BAR);
mdev->mmio.len = pci_resource_len(pdev, IMX_MIC_MMIO_BAR);
mdev->mmio.va = pci_ioremap_bar(pdev, IMX_MIC_MMIO_BAR);
if (!mdev->mmio.va) {
dev_err(&pdev->dev, "Cannot remap MMIO BAR\n");
rc = -EIO;
goto release_regions;
}
/* card swiotlb region */
mdev->aper.pa = pci_resource_start(pdev, IMX_MIC_APER_BAR);
/* host allocate device page from cma to map for card */
cma_for_each_area(find_cma, &cma);
if (cma)
dev_set_cma_area(&pdev->dev, cma);
else
dev_warn(&pdev->dev, "Can't set the specific cma region for device\n");
dp_va = dma_alloc_coherent(&pdev->dev, MIC_DP_SIZE, &dp_dma_addr, GFP_KERNEL);
if (!dp_va) {
dev_err(&pdev->dev, "Failed to allocate ddr space for EP\n");
rc = -ENOMEM;
goto unmap_mmio;
}
/* save the device page address */
mdev->dp_dma_addr = dp_dma_addr;
mdev->dp = dp_va;
imx_mic_bootparam_init(mdev);
/* TEMP BAR is used for host to transfer device page address and size to card */
temp_bar_base = pci_ioremap_bar(pdev, IMX_MIC_TEMP_BAR);
if (!temp_bar_base) {
dev_err(&pdev->dev, "Cannot remap TEMP BAR\n");
rc = -EIO;
goto free_dma;
}
writeq(mdev->aper.pa, temp_bar_base + RC_MAP_ADDR_OFFSET);
writeq(SZ_32M, temp_bar_base + RC_SHMEM_SIZE_OFFSET);
writeq(mdev->dp_dma_addr, temp_bar_base + RC_SHMEM_ADDR_OFFSET);
mdev->temp_bar_base = temp_bar_base;
pci_set_drvdata(pdev, mdev);
mdev->cosm_dev = cosm_register_device(&mdev->pdev->dev, &cosm_hw_ops);
if (IS_ERR(mdev->cosm_dev)) {
rc = PTR_ERR(mdev->cosm_dev);
dev_err(&pdev->dev, "cosm_add_device failed\n");
goto unmap_temp;
}
return 0;
unmap_temp:
iounmap(mdev->temp_bar_base);
free_dma:
dma_free_coherent(&pdev->dev, MIC_DP_SIZE, mdev->dp, mdev->dp_dma_addr);
unmap_mmio:
iounmap(mdev->mmio.va);
release_regions:
pci_release_regions(pdev);
disable_device:
pci_disable_device(pdev);
ida_remove:
ida_simple_remove(&g_imx_mic_ida, mdev->id);
ida_fail:
kfree(mdev);
mdev_alloc_fail:
dev_err(&pdev->dev, "Probe failed rc %d\n", rc);
return rc;
}
/**
* imx_mic_remove - Device Removal Routine
* imx_mic_remove is called by the PCI subsystem to alert the driver
* that it should release a PCI device.
*
* @pdev: PCI device structure
*/
static void imx_mic_remove(struct pci_dev *pdev)
{
struct imx_mic_device *mdev;
mdev = pci_get_drvdata(pdev);
if (!mdev)
return;
cosm_unregister_device(mdev->cosm_dev);
imx_mic_bootparam_init(mdev);
iounmap(mdev->temp_bar_base);
dma_free_coherent(&pdev->dev, MIC_DP_SIZE, mdev->dp, mdev->dp_dma_addr);
iounmap(mdev->mmio.va);
pci_release_regions(pdev);
pci_disable_device(pdev);
ida_simple_remove(&g_imx_mic_ida, mdev->id);
kfree(mdev);
}
static struct pci_driver imx_mic_driver = {
.name = imx_mic_driver_name,
.id_table = imx_mic_pci_tbl,
.probe = imx_mic_probe,
.remove = imx_mic_remove
};
static int __init imx_mic_init(void)
{
int ret;
ida_init(&g_imx_mic_ida);
ret = pci_register_driver(&imx_mic_driver);
if (ret) {
pr_err("pci_register_driver failed ret %d\n", ret);
goto cleanup_ida;
}
return 0;
cleanup_ida:
ida_destroy(&g_imx_mic_ida);
return ret;
}
static void __exit imx_mic_exit(void)
{
pci_unregister_driver(&imx_mic_driver);
ida_destroy(&g_imx_mic_ida);
}
module_init(imx_mic_init);
module_exit(imx_mic_exit);
MODULE_AUTHOR("NXP Corporation");
MODULE_DESCRIPTION("NXP MIC Host driver");
MODULE_LICENSE("GPL v2");
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