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
34enum 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
43static 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
61static 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
74static __devinitdata struct resource cs5535_mfd_resources[NR_BARS];
75
76static __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
116static 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
126static void cs5535_clone_olpc_cells(void) { }
127#endif
128
129static 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
164err_disable:
165	pci_disable_device(pdev);
166	return err;
167}
168
169static void __devexit cs5535_mfd_remove(struct pci_dev *pdev)
170{
171	mfd_remove_devices(&pdev->dev);
172	pci_disable_device(pdev);
173}
174
175static 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};
180MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
181
182static 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
189static int __init cs5535_mfd_init(void)
190{
191	return pci_register_driver(&cs5535_mfd_driver);
192}
193
194static void __exit cs5535_mfd_exit(void)
195{
196	pci_unregister_driver(&cs5535_mfd_driver);
197}
198
199module_init(cs5535_mfd_init);
200module_exit(cs5535_mfd_exit);
201
202MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
203MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
204MODULE_LICENSE("GPL");
205