1 | // SPDX-License-Identifier: GPL-2.0-or-later |
2 | /* |
3 | * Linux multi-function-device driver (MFD) for the integrated peripherals |
4 | * of the VIA VX855 chipset |
5 | * |
6 | * Copyright (C) 2009 VIA Technologies, Inc. |
7 | * Copyright (C) 2010 One Laptop per Child |
8 | * Author: Harald Welte <HaraldWelte@viatech.com> |
9 | * All rights reserved. |
10 | */ |
11 | |
12 | #include <linux/kernel.h> |
13 | #include <linux/module.h> |
14 | #include <linux/device.h> |
15 | #include <linux/platform_device.h> |
16 | #include <linux/pci.h> |
17 | #include <linux/mfd/core.h> |
18 | |
19 | /* offset into pci config space indicating the 16bit register containing |
20 | * the power management IO space base */ |
21 | #define VX855_CFG_PMIO_OFFSET 0x88 |
22 | |
23 | /* ACPI I/O Space registers */ |
24 | #define VX855_PMIO_ACPI 0x00 |
25 | #define VX855_PMIO_ACPI_LEN 0x0b |
26 | |
27 | /* Processor Power Management */ |
28 | #define VX855_PMIO_PPM 0x10 |
29 | #define VX855_PMIO_PPM_LEN 0x08 |
30 | |
31 | /* General Purpose Power Management */ |
32 | #define VX855_PMIO_GPPM 0x20 |
33 | #define VX855_PMIO_R_GPI 0x48 |
34 | #define VX855_PMIO_R_GPO 0x4c |
35 | #define VX855_PMIO_GPPM_LEN 0x33 |
36 | |
37 | #define VSPIC_MMIO_SIZE 0x1000 |
38 | |
39 | static struct resource vx855_gpio_resources[] = { |
40 | { |
41 | .flags = IORESOURCE_IO, |
42 | }, |
43 | { |
44 | .flags = IORESOURCE_IO, |
45 | }, |
46 | }; |
47 | |
48 | static const struct mfd_cell vx855_cells[] = { |
49 | { |
50 | .name = "vx855_gpio" , |
51 | .num_resources = ARRAY_SIZE(vx855_gpio_resources), |
52 | .resources = vx855_gpio_resources, |
53 | |
54 | /* we must ignore resource conflicts, for reasons outlined in |
55 | * the vx855_gpio driver */ |
56 | .ignore_resource_conflicts = true, |
57 | }, |
58 | }; |
59 | |
60 | static int vx855_probe(struct pci_dev *pdev, |
61 | const struct pci_device_id *id) |
62 | { |
63 | int ret; |
64 | u16 gpio_io_offset; |
65 | |
66 | ret = pci_enable_device(dev: pdev); |
67 | if (ret) |
68 | return -ENODEV; |
69 | |
70 | pci_read_config_word(dev: pdev, VX855_CFG_PMIO_OFFSET, val: &gpio_io_offset); |
71 | if (!gpio_io_offset) { |
72 | dev_warn(&pdev->dev, |
73 | "BIOS did not assign PMIO base offset?!?\n" ); |
74 | ret = -ENODEV; |
75 | goto out; |
76 | } |
77 | |
78 | /* mask out the lowest seven bits, as they are always zero, but |
79 | * hardware returns them as 0x01 */ |
80 | gpio_io_offset &= 0xff80; |
81 | |
82 | /* As the region identified here includes many non-GPIO things, we |
83 | * only work with the specific registers that concern us. */ |
84 | vx855_gpio_resources[0].start = gpio_io_offset + VX855_PMIO_R_GPI; |
85 | vx855_gpio_resources[0].end = vx855_gpio_resources[0].start + 3; |
86 | vx855_gpio_resources[1].start = gpio_io_offset + VX855_PMIO_R_GPO; |
87 | vx855_gpio_resources[1].end = vx855_gpio_resources[1].start + 3; |
88 | |
89 | ret = mfd_add_devices(parent: &pdev->dev, id: -1, cells: vx855_cells, ARRAY_SIZE(vx855_cells), |
90 | NULL, irq_base: 0, NULL); |
91 | |
92 | /* we always return -ENODEV here in order to enable other |
93 | * drivers like old, not-yet-platform_device ported i2c-viapro */ |
94 | return -ENODEV; |
95 | out: |
96 | pci_disable_device(dev: pdev); |
97 | return ret; |
98 | } |
99 | |
100 | static void vx855_remove(struct pci_dev *pdev) |
101 | { |
102 | mfd_remove_devices(parent: &pdev->dev); |
103 | pci_disable_device(dev: pdev); |
104 | } |
105 | |
106 | static const struct pci_device_id vx855_pci_tbl[] = { |
107 | { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855) }, |
108 | { 0, } |
109 | }; |
110 | MODULE_DEVICE_TABLE(pci, vx855_pci_tbl); |
111 | |
112 | static struct pci_driver vx855_pci_driver = { |
113 | .name = "vx855" , |
114 | .id_table = vx855_pci_tbl, |
115 | .probe = vx855_probe, |
116 | .remove = vx855_remove, |
117 | }; |
118 | |
119 | module_pci_driver(vx855_pci_driver); |
120 | |
121 | MODULE_LICENSE("GPL" ); |
122 | MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>" ); |
123 | MODULE_DESCRIPTION("Driver for the VIA VX855 chipset" ); |
124 | |