tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * cs5535-mfd.c - core MFD driver for CS5535/CS5536 southbridges
3 *
4 * The CS5535 and CS5536 has an ISA bridge on the PCI bus that is
5 * used for accessing GPIOs, MFGPTs, ACPI, etc. Each subdevice has
6 * an IO range that's specified in a single BAR. The BAR order is
7 * hardcoded in the CS553x specifications.
8 *
9 * Copyright (c) 2010 Andres Salomon <dilinger@queued.net>
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License version 2 as
13 * published by the Free Software Foundation.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
23 */
24
25#include <linux/kernel.h>
26#include <linux/mfd/core.h>
27#include <linux/module.h>
28#include <linux/pci.h>
29#include <asm/olpc.h>
30
31#define DRV_NAME "cs5535-mfd"
32
33enum cs5535_mfd_bars {
34 SMB_BAR = 0,
35 GPIO_BAR = 1,
36 MFGPT_BAR = 2,
37 PMS_BAR = 4,
38 ACPI_BAR = 5,
39 NR_BARS,
40};
41
42static int cs5535_mfd_res_enable(struct platform_device *pdev)
43{
44 struct resource *res;
45
46 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
47 if (!res) {
48 dev_err(&pdev->dev, "can't fetch device resource info\n");
49 return -EIO;
50 }
51
52 if (!request_region(res->start, resource_size(res), DRV_NAME)) {
53 dev_err(&pdev->dev, "can't request region\n");
54 return -EIO;
55 }
56
57 return 0;
58}
59
60static int cs5535_mfd_res_disable(struct platform_device *pdev)
61{
62 struct resource *res;
63
64 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
65 if (!res) {
66 dev_err(&pdev->dev, "can't fetch device resource info\n");
67 return -EIO;
68 }
69
70 release_region(res->start, resource_size(res));
71 return 0;
72}
73
74static struct resource cs5535_mfd_resources[NR_BARS];
75
76static struct mfd_cell cs5535_mfd_cells[] = {
77 {
78 .id = SMB_BAR,
79 .name = "cs5535-smb",
80 .num_resources = 1,
81 .resources = &cs5535_mfd_resources[SMB_BAR],
82 },
83 {
84 .id = GPIO_BAR,
85 .name = "cs5535-gpio",
86 .num_resources = 1,
87 .resources = &cs5535_mfd_resources[GPIO_BAR],
88 },
89 {
90 .id = MFGPT_BAR,
91 .name = "cs5535-mfgpt",
92 .num_resources = 1,
93 .resources = &cs5535_mfd_resources[MFGPT_BAR],
94 },
95 {
96 .id = PMS_BAR,
97 .name = "cs5535-pms",
98 .num_resources = 1,
99 .resources = &cs5535_mfd_resources[PMS_BAR],
100
101 .enable = cs5535_mfd_res_enable,
102 .disable = cs5535_mfd_res_disable,
103 },
104 {
105 .id = ACPI_BAR,
106 .name = "cs5535-acpi",
107 .num_resources = 1,
108 .resources = &cs5535_mfd_resources[ACPI_BAR],
109
110 .enable = cs5535_mfd_res_enable,
111 .disable = cs5535_mfd_res_disable,
112 },
113};
114
115#ifdef CONFIG_OLPC
116static void cs5535_clone_olpc_cells(void)
117{
118 static const char *acpi_clones[] = {
119 "olpc-xo1-pm-acpi",
120 "olpc-xo1-sci-acpi"
121 };
122
123 if (!machine_is_olpc())
124 return;
125
126 mfd_clone_cell("cs5535-acpi", acpi_clones, ARRAY_SIZE(acpi_clones));
127}
128#else
129static void cs5535_clone_olpc_cells(void) { }
130#endif
131
132static int cs5535_mfd_probe(struct pci_dev *pdev,
133 const struct pci_device_id *id)
134{
135 int err, i;
136
137 err = pci_enable_device(pdev);
138 if (err)
139 return err;
140
141 /* fill in IO range for each cell; subdrivers handle the region */
142 for (i = 0; i < ARRAY_SIZE(cs5535_mfd_cells); i++) {
143 int bar = cs5535_mfd_cells[i].id;
144 struct resource *r = &cs5535_mfd_resources[bar];
145
146 r->flags = IORESOURCE_IO;
147 r->start = pci_resource_start(pdev, bar);
148 r->end = pci_resource_end(pdev, bar);
149
150 /* id is used for temporarily storing BAR; unset it now */
151 cs5535_mfd_cells[i].id = 0;
152 }
153
154 err = mfd_add_devices(&pdev->dev, -1, cs5535_mfd_cells,
155 ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
156 if (err) {
157 dev_err(&pdev->dev, "MFD add devices failed: %d\n", err);
158 goto err_disable;
159 }
160 cs5535_clone_olpc_cells();
161
162 dev_info(&pdev->dev, "%zu devices registered.\n",
163 ARRAY_SIZE(cs5535_mfd_cells));
164
165 return 0;
166
167err_disable:
168 pci_disable_device(pdev);
169 return err;
170}
171
172static void cs5535_mfd_remove(struct pci_dev *pdev)
173{
174 mfd_remove_devices(&pdev->dev);
175 pci_disable_device(pdev);
176}
177
178static const struct pci_device_id cs5535_mfd_pci_tbl[] = {
179 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
180 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
181 { 0, }
182};
183MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
184
185static struct pci_driver cs5535_mfd_driver = {
186 .name = DRV_NAME,
187 .id_table = cs5535_mfd_pci_tbl,
188 .probe = cs5535_mfd_probe,
189 .remove = cs5535_mfd_remove,
190};
191
192module_pci_driver(cs5535_mfd_driver);
193
194MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
195MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
196MODULE_LICENSE("GPL");