tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Intel Elkhart Lake Programmable Service Engine (PSE) I/O
4 *
5 * Copyright (c) 2025 Intel Corporation.
6 *
7 * Author: Raag Jadav <raag.jadav@intel.com>
8 */
9
10#include <linux/auxiliary_bus.h>
11#include <linux/device/devres.h>
12#include <linux/errno.h>
13#include <linux/gfp_types.h>
14#include <linux/ioport.h>
15#include <linux/mod_devicetable.h>
16#include <linux/module.h>
17#include <linux/pci.h>
18#include <linux/sizes.h>
19#include <linux/types.h>
20
21#include <linux/ehl_pse_io_aux.h>
22
23#define EHL_PSE_IO_DEV_SIZE SZ_4K
24
25static int ehl_pse_io_dev_create(struct pci_dev *pci, const char *name, int idx)
26{
27 struct device *dev = &pci->dev;
28 struct auxiliary_device *adev;
29 struct ehl_pse_io_data *data;
30 resource_size_t start, offset;
31 u32 id;
32
33 data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
34 if (!data)
35 return -ENOMEM;
36
37 id = (pci_domain_nr(pci->bus) << 16) | pci_dev_id(pci);
38 start = pci_resource_start(pci, 0);
39 offset = EHL_PSE_IO_DEV_SIZE * idx;
40
41 data->mem = DEFINE_RES_MEM(start + offset, EHL_PSE_IO_DEV_SIZE);
42 data->irq = pci_irq_vector(pci, idx);
43
44 adev = __devm_auxiliary_device_create(dev, EHL_PSE_IO_NAME, name, data, id);
45
46 return adev ? 0 : -ENODEV;
47}
48
49static int ehl_pse_io_probe(struct pci_dev *pci, const struct pci_device_id *id)
50{
51 int ret;
52
53 ret = pcim_enable_device(pci);
54 if (ret)
55 return ret;
56
57 pci_set_master(pci);
58
59 ret = pci_alloc_irq_vectors(pci, 2, 2, PCI_IRQ_MSI);
60 if (ret < 0)
61 return ret;
62
63 ret = ehl_pse_io_dev_create(pci, EHL_PSE_GPIO_NAME, 0);
64 if (ret)
65 return ret;
66
67 return ehl_pse_io_dev_create(pci, EHL_PSE_TIO_NAME, 1);
68}
69
70static const struct pci_device_id ehl_pse_io_ids[] = {
71 { PCI_VDEVICE(INTEL, 0x4b88) },
72 { PCI_VDEVICE(INTEL, 0x4b89) },
73 { }
74};
75MODULE_DEVICE_TABLE(pci, ehl_pse_io_ids);
76
77static struct pci_driver ehl_pse_io_driver = {
78 .name = EHL_PSE_IO_NAME,
79 .id_table = ehl_pse_io_ids,
80 .probe = ehl_pse_io_probe,
81};
82module_pci_driver(ehl_pse_io_driver);
83
84MODULE_AUTHOR("Raag Jadav <raag.jadav@intel.com>");
85MODULE_DESCRIPTION("Intel Elkhart Lake PSE I/O driver");
86MODULE_LICENSE("GPL");