1 | // SPDX-License-Identifier: GPL-2.0-only |
2 | /* |
3 | * cs5535-mfd.c - core MFD driver for CS5535/CS5536 southbridges |
4 | * |
5 | * The CS5535 and CS5536 has an ISA bridge on the PCI bus that is |
6 | * used for accessing GPIOs, MFGPTs, ACPI, etc. Each subdevice has |
7 | * an IO range that's specified in a single BAR. The BAR order is |
8 | * hardcoded in the CS553x specifications. |
9 | * |
10 | * Copyright (c) 2010 Andres Salomon <dilinger@queued.net> |
11 | */ |
12 | |
13 | #include <linux/kernel.h> |
14 | #include <linux/mfd/core.h> |
15 | #include <linux/module.h> |
16 | #include <linux/pci.h> |
17 | #include <asm/olpc.h> |
18 | |
19 | #define DRV_NAME "cs5535-mfd" |
20 | |
21 | enum cs5535_mfd_bars { |
22 | SMB_BAR = 0, |
23 | GPIO_BAR = 1, |
24 | MFGPT_BAR = 2, |
25 | PMS_BAR = 4, |
26 | ACPI_BAR = 5, |
27 | NR_BARS, |
28 | }; |
29 | |
30 | static struct resource cs5535_mfd_resources[NR_BARS]; |
31 | |
32 | static struct mfd_cell cs5535_mfd_cells[] = { |
33 | { |
34 | .name = "cs5535-smb" , |
35 | .num_resources = 1, |
36 | .resources = &cs5535_mfd_resources[SMB_BAR], |
37 | }, |
38 | { |
39 | .name = "cs5535-gpio" , |
40 | .num_resources = 1, |
41 | .resources = &cs5535_mfd_resources[GPIO_BAR], |
42 | }, |
43 | { |
44 | .name = "cs5535-mfgpt" , |
45 | .num_resources = 1, |
46 | .resources = &cs5535_mfd_resources[MFGPT_BAR], |
47 | }, |
48 | { |
49 | .name = "cs5535-pms" , |
50 | .num_resources = 1, |
51 | .resources = &cs5535_mfd_resources[PMS_BAR], |
52 | }, |
53 | }; |
54 | |
55 | static struct mfd_cell cs5535_olpc_mfd_cells[] = { |
56 | { |
57 | .name = "olpc-xo1-pm-acpi" , |
58 | .num_resources = 1, |
59 | .resources = &cs5535_mfd_resources[ACPI_BAR], |
60 | }, |
61 | { |
62 | .name = "olpc-xo1-sci-acpi" , |
63 | .num_resources = 1, |
64 | .resources = &cs5535_mfd_resources[ACPI_BAR], |
65 | }, |
66 | }; |
67 | |
68 | static int cs5535_mfd_probe(struct pci_dev *pdev, |
69 | const struct pci_device_id *id) |
70 | { |
71 | int err, bar; |
72 | |
73 | err = pci_enable_device(dev: pdev); |
74 | if (err) |
75 | return err; |
76 | |
77 | for (bar = 0; bar < NR_BARS; bar++) { |
78 | struct resource *r = &cs5535_mfd_resources[bar]; |
79 | |
80 | r->flags = IORESOURCE_IO; |
81 | r->start = pci_resource_start(pdev, bar); |
82 | r->end = pci_resource_end(pdev, bar); |
83 | } |
84 | |
85 | err = pci_request_region(pdev, PMS_BAR, DRV_NAME); |
86 | if (err) { |
87 | dev_err(&pdev->dev, "Failed to request PMS_BAR's IO region\n" ); |
88 | goto err_disable; |
89 | } |
90 | |
91 | err = mfd_add_devices(parent: &pdev->dev, PLATFORM_DEVID_NONE, cells: cs5535_mfd_cells, |
92 | ARRAY_SIZE(cs5535_mfd_cells), NULL, irq_base: 0, NULL); |
93 | if (err) { |
94 | dev_err(&pdev->dev, |
95 | "Failed to add CS5535 sub-devices: %d\n" , err); |
96 | goto err_release_pms; |
97 | } |
98 | |
99 | if (machine_is_olpc()) { |
100 | err = pci_request_region(pdev, ACPI_BAR, DRV_NAME); |
101 | if (err) { |
102 | dev_err(&pdev->dev, |
103 | "Failed to request ACPI_BAR's IO region\n" ); |
104 | goto err_remove_devices; |
105 | } |
106 | |
107 | err = mfd_add_devices(parent: &pdev->dev, PLATFORM_DEVID_NONE, |
108 | cells: cs5535_olpc_mfd_cells, |
109 | ARRAY_SIZE(cs5535_olpc_mfd_cells), |
110 | NULL, irq_base: 0, NULL); |
111 | if (err) { |
112 | dev_err(&pdev->dev, |
113 | "Failed to add CS5535 OLPC sub-devices: %d\n" , |
114 | err); |
115 | goto err_release_acpi; |
116 | } |
117 | } |
118 | |
119 | dev_info(&pdev->dev, "%zu devices registered.\n" , |
120 | ARRAY_SIZE(cs5535_mfd_cells)); |
121 | |
122 | return 0; |
123 | |
124 | err_release_acpi: |
125 | pci_release_region(pdev, ACPI_BAR); |
126 | err_remove_devices: |
127 | mfd_remove_devices(parent: &pdev->dev); |
128 | err_release_pms: |
129 | pci_release_region(pdev, PMS_BAR); |
130 | err_disable: |
131 | pci_disable_device(dev: pdev); |
132 | return err; |
133 | } |
134 | |
135 | static void cs5535_mfd_remove(struct pci_dev *pdev) |
136 | { |
137 | mfd_remove_devices(parent: &pdev->dev); |
138 | |
139 | if (machine_is_olpc()) |
140 | pci_release_region(pdev, ACPI_BAR); |
141 | |
142 | pci_release_region(pdev, PMS_BAR); |
143 | pci_disable_device(dev: pdev); |
144 | } |
145 | |
146 | static const struct pci_device_id cs5535_mfd_pci_tbl[] = { |
147 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) }, |
148 | { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) }, |
149 | { 0, } |
150 | }; |
151 | MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl); |
152 | |
153 | static struct pci_driver cs5535_mfd_driver = { |
154 | .name = DRV_NAME, |
155 | .id_table = cs5535_mfd_pci_tbl, |
156 | .probe = cs5535_mfd_probe, |
157 | .remove = cs5535_mfd_remove, |
158 | }; |
159 | |
160 | module_pci_driver(cs5535_mfd_driver); |
161 | |
162 | MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>" ); |
163 | MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device" ); |
164 | MODULE_LICENSE("GPL" ); |
165 | |