tjh.dev
Linux kernel mirror (for testing)
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linux
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
21enum 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
30static int cs5535_mfd_res_enable(struct platform_device *pdev)
31{
32 struct resource *res;
33
34 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
35 if (!res) {
36 dev_err(&pdev->dev, "can't fetch device resource info\n");
37 return -EIO;
38 }
39
40 if (!request_region(res->start, resource_size(res), DRV_NAME)) {
41 dev_err(&pdev->dev, "can't request region\n");
42 return -EIO;
43 }
44
45 return 0;
46}
47
48static int cs5535_mfd_res_disable(struct platform_device *pdev)
49{
50 struct resource *res;
51
52 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
53 if (!res) {
54 dev_err(&pdev->dev, "can't fetch device resource info\n");
55 return -EIO;
56 }
57
58 release_region(res->start, resource_size(res));
59 return 0;
60}
61
62static struct resource cs5535_mfd_resources[NR_BARS];
63
64static struct mfd_cell cs5535_mfd_cells[] = {
65 {
66 .id = SMB_BAR,
67 .name = "cs5535-smb",
68 .num_resources = 1,
69 .resources = &cs5535_mfd_resources[SMB_BAR],
70 },
71 {
72 .id = GPIO_BAR,
73 .name = "cs5535-gpio",
74 .num_resources = 1,
75 .resources = &cs5535_mfd_resources[GPIO_BAR],
76 },
77 {
78 .id = MFGPT_BAR,
79 .name = "cs5535-mfgpt",
80 .num_resources = 1,
81 .resources = &cs5535_mfd_resources[MFGPT_BAR],
82 },
83 {
84 .id = PMS_BAR,
85 .name = "cs5535-pms",
86 .num_resources = 1,
87 .resources = &cs5535_mfd_resources[PMS_BAR],
88
89 .enable = cs5535_mfd_res_enable,
90 .disable = cs5535_mfd_res_disable,
91 },
92 {
93 .id = ACPI_BAR,
94 .name = "cs5535-acpi",
95 .num_resources = 1,
96 .resources = &cs5535_mfd_resources[ACPI_BAR],
97
98 .enable = cs5535_mfd_res_enable,
99 .disable = cs5535_mfd_res_disable,
100 },
101};
102
103static const char *olpc_acpi_clones[] = {
104 "olpc-xo1-pm-acpi",
105 "olpc-xo1-sci-acpi"
106};
107
108static int cs5535_mfd_probe(struct pci_dev *pdev,
109 const struct pci_device_id *id)
110{
111 int err, i;
112
113 err = pci_enable_device(pdev);
114 if (err)
115 return err;
116
117 /* fill in IO range for each cell; subdrivers handle the region */
118 for (i = 0; i < ARRAY_SIZE(cs5535_mfd_cells); i++) {
119 int bar = cs5535_mfd_cells[i].id;
120 struct resource *r = &cs5535_mfd_resources[bar];
121
122 r->flags = IORESOURCE_IO;
123 r->start = pci_resource_start(pdev, bar);
124 r->end = pci_resource_end(pdev, bar);
125
126 /* id is used for temporarily storing BAR; unset it now */
127 cs5535_mfd_cells[i].id = 0;
128 }
129
130 err = mfd_add_devices(&pdev->dev, -1, cs5535_mfd_cells,
131 ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
132 if (err) {
133 dev_err(&pdev->dev, "MFD add devices failed: %d\n", err);
134 goto err_disable;
135 }
136
137 if (machine_is_olpc())
138 mfd_clone_cell("cs5535-acpi", olpc_acpi_clones, ARRAY_SIZE(olpc_acpi_clones));
139
140 dev_info(&pdev->dev, "%zu devices registered.\n",
141 ARRAY_SIZE(cs5535_mfd_cells));
142
143 return 0;
144
145err_disable:
146 pci_disable_device(pdev);
147 return err;
148}
149
150static void cs5535_mfd_remove(struct pci_dev *pdev)
151{
152 mfd_remove_devices(&pdev->dev);
153 pci_disable_device(pdev);
154}
155
156static const struct pci_device_id cs5535_mfd_pci_tbl[] = {
157 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
158 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
159 { 0, }
160};
161MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
162
163static struct pci_driver cs5535_mfd_driver = {
164 .name = DRV_NAME,
165 .id_table = cs5535_mfd_pci_tbl,
166 .probe = cs5535_mfd_probe,
167 .remove = cs5535_mfd_remove,
168};
169
170module_pci_driver(cs5535_mfd_driver);
171
172MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
173MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
174MODULE_LICENSE("GPL");