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/init.h>
27 #include <linux/mfd/core.h>
28 #include <linux/module.h>
29 #include <linux/pci.h>
30 #include <asm/olpc.h>
31
32 #define DRV_NAME "cs5535-mfd"
33
34 enum cs5535_mfd_bars {
35 SMB_BAR = 0,
36 GPIO_BAR = 1,
37 MFGPT_BAR = 2,
38 PMS_BAR = 4,
39 ACPI_BAR = 5,
40 NR_BARS,
41 };
42
cs5535_mfd_res_enable(struct platform_device * pdev)43 static int cs5535_mfd_res_enable(struct platform_device *pdev)
44 {
45 struct resource *res;
46
47 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
48 if (!res) {
49 dev_err(&pdev->dev, "can't fetch device resource info\n");
50 return -EIO;
51 }
52
53 if (!request_region(res->start, resource_size(res), DRV_NAME)) {
54 dev_err(&pdev->dev, "can't request region\n");
55 return -EIO;
56 }
57
58 return 0;
59 }
60
cs5535_mfd_res_disable(struct platform_device * pdev)61 static int cs5535_mfd_res_disable(struct platform_device *pdev)
62 {
63 struct resource *res;
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
74 static __devinitdata struct resource cs5535_mfd_resources[NR_BARS];
75
76 static __devinitdata 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
cs5535_clone_olpc_cells(void)116 static void __devinit cs5535_clone_olpc_cells(void)
117 {
118 const char *acpi_clones[] = { "olpc-xo1-pm-acpi", "olpc-xo1-sci-acpi" };
119
120 if (!machine_is_olpc())
121 return;
122
123 mfd_clone_cell("cs5535-acpi", acpi_clones, ARRAY_SIZE(acpi_clones));
124 }
125 #else
cs5535_clone_olpc_cells(void)126 static void cs5535_clone_olpc_cells(void) { }
127 #endif
128
cs5535_mfd_probe(struct pci_dev * pdev,const struct pci_device_id * id)129 static int __devinit cs5535_mfd_probe(struct pci_dev *pdev,
130 const struct pci_device_id *id)
131 {
132 int err, i;
133
134 err = pci_enable_device(pdev);
135 if (err)
136 return err;
137
138 /* fill in IO range for each cell; subdrivers handle the region */
139 for (i = 0; i < ARRAY_SIZE(cs5535_mfd_cells); i++) {
140 int bar = cs5535_mfd_cells[i].id;
141 struct resource *r = &cs5535_mfd_resources[bar];
142
143 r->flags = IORESOURCE_IO;
144 r->start = pci_resource_start(pdev, bar);
145 r->end = pci_resource_end(pdev, bar);
146
147 /* id is used for temporarily storing BAR; unset it now */
148 cs5535_mfd_cells[i].id = 0;
149 }
150
151 err = mfd_add_devices(&pdev->dev, -1, cs5535_mfd_cells,
152 ARRAY_SIZE(cs5535_mfd_cells), NULL, 0);
153 if (err) {
154 dev_err(&pdev->dev, "MFD add devices failed: %d\n", err);
155 goto err_disable;
156 }
157 cs5535_clone_olpc_cells();
158
159 dev_info(&pdev->dev, "%zu devices registered.\n",
160 ARRAY_SIZE(cs5535_mfd_cells));
161
162 return 0;
163
164 err_disable:
165 pci_disable_device(pdev);
166 return err;
167 }
168
cs5535_mfd_remove(struct pci_dev * pdev)169 static void __devexit cs5535_mfd_remove(struct pci_dev *pdev)
170 {
171 mfd_remove_devices(&pdev->dev);
172 pci_disable_device(pdev);
173 }
174
175 static DEFINE_PCI_DEVICE_TABLE(cs5535_mfd_pci_tbl) = {
176 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
177 { PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
178 { 0, }
179 };
180 MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
181
182 static struct pci_driver cs5535_mfd_driver = {
183 .name = DRV_NAME,
184 .id_table = cs5535_mfd_pci_tbl,
185 .probe = cs5535_mfd_probe,
186 .remove = __devexit_p(cs5535_mfd_remove),
187 };
188
cs5535_mfd_init(void)189 static int __init cs5535_mfd_init(void)
190 {
191 return pci_register_driver(&cs5535_mfd_driver);
192 }
193
cs5535_mfd_exit(void)194 static void __exit cs5535_mfd_exit(void)
195 {
196 pci_unregister_driver(&cs5535_mfd_driver);
197 }
198
199 module_init(cs5535_mfd_init);
200 module_exit(cs5535_mfd_exit);
201
202 MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
203 MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
204 MODULE_LICENSE("GPL");
205