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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
375fc77b DD |
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. | |
375fc77b DD |
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 | ||
5ac98553 | 48 | static const struct mfd_cell vx855_cells[] = { |
375fc77b DD |
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 | ||
f791be49 | 60 | static int vx855_probe(struct pci_dev *pdev, |
375fc77b DD |
61 | const struct pci_device_id *id) |
62 | { | |
63 | int ret; | |
64 | u16 gpio_io_offset; | |
65 | ||
66 | ret = pci_enable_device(pdev); | |
67 | if (ret) | |
68 | return -ENODEV; | |
69 | ||
70 | pci_read_config_word(pdev, VX855_CFG_PMIO_OFFSET, &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(&pdev->dev, -1, vx855_cells, ARRAY_SIZE(vx855_cells), | |
0848c94f | 90 | NULL, 0, NULL); |
375fc77b DD |
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(pdev); | |
97 | return ret; | |
98 | } | |
99 | ||
4740f73f | 100 | static void vx855_remove(struct pci_dev *pdev) |
375fc77b DD |
101 | { |
102 | mfd_remove_devices(&pdev->dev); | |
103 | pci_disable_device(pdev); | |
104 | } | |
105 | ||
36fcd06c | 106 | static const struct pci_device_id vx855_pci_tbl[] = { |
375fc77b DD |
107 | { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855) }, |
108 | { 0, } | |
109 | }; | |
bcd2f639 | 110 | MODULE_DEVICE_TABLE(pci, vx855_pci_tbl); |
375fc77b DD |
111 | |
112 | static struct pci_driver vx855_pci_driver = { | |
113 | .name = "vx855", | |
114 | .id_table = vx855_pci_tbl, | |
115 | .probe = vx855_probe, | |
84449216 | 116 | .remove = vx855_remove, |
375fc77b DD |
117 | }; |
118 | ||
38a36f5a | 119 | module_pci_driver(vx855_pci_driver); |
375fc77b DD |
120 | |
121 | MODULE_LICENSE("GPL"); | |
122 | MODULE_AUTHOR("Harald Welte <HaraldWelte@viatech.com>"); | |
123 | MODULE_DESCRIPTION("Driver for the VIA VX855 chipset"); |