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	res = platform_get_resource(pdev, IORESOURCE_IO, 0);
64	if (!res) {
65		dev_err(&pdev->dev, "can't fetch device resource info\n");
66		return -EIO;
67	}
68
69	release_region(res->start, resource_size(res));
70	return 0;
71}
72
73static struct resource cs5535_mfd_resources[NR_BARS];
74
75static struct mfd_cell cs5535_mfd_cells[] = {
76	{
77		.id = SMB_BAR,
78		.name = "cs5535-smb",
79		.num_resources = 1,
80		.resources = &cs5535_mfd_resources[SMB_BAR],
81	},
82	{
83		.id = GPIO_BAR,
84		.name = "cs5535-gpio",
85		.num_resources = 1,
86		.resources = &cs5535_mfd_resources[GPIO_BAR],
87	},
88	{
89		.id = MFGPT_BAR,
90		.name = "cs5535-mfgpt",
91		.num_resources = 1,
92		.resources = &cs5535_mfd_resources[MFGPT_BAR],
93	},
94	{
95		.id = PMS_BAR,
96		.name = "cs5535-pms",
97		.num_resources = 1,
98		.resources = &cs5535_mfd_resources[PMS_BAR],
99
100		.enable = cs5535_mfd_res_enable,
101		.disable = cs5535_mfd_res_disable,
102	},
103	{
104		.id = ACPI_BAR,
105		.name = "cs5535-acpi",
106		.num_resources = 1,
107		.resources = &cs5535_mfd_resources[ACPI_BAR],
108
109		.enable = cs5535_mfd_res_enable,
110		.disable = cs5535_mfd_res_disable,
111	},
112};
113
114#ifdef CONFIG_OLPC
115static void cs5535_clone_olpc_cells(void)
116{
117	const char *acpi_clones[] = { "olpc-xo1-pm-acpi", "olpc-xo1-sci-acpi" };
118
119	if (!machine_is_olpc())
120		return;
121
122	mfd_clone_cell("cs5535-acpi", acpi_clones, ARRAY_SIZE(acpi_clones));
123}
124#else
125static void cs5535_clone_olpc_cells(void) { }
126#endif
127
128static int cs5535_mfd_probe(struct pci_dev *pdev,
129		const struct pci_device_id *id)
130{
131	int err, i;
132
133	err = pci_enable_device(pdev);
134	if (err)
135		return err;
136
137	/* fill in IO range for each cell; subdrivers handle the region */
138	for (i = 0; i < ARRAY_SIZE(cs5535_mfd_cells); i++) {
139		int bar = cs5535_mfd_cells[i].id;
140		struct resource *r = &cs5535_mfd_resources[bar];
141
142		r->flags = IORESOURCE_IO;
143		r->start = pci_resource_start(pdev, bar);
144		r->end = pci_resource_end(pdev, bar);
145
146		/* id is used for temporarily storing BAR; unset it now */
147		cs5535_mfd_cells[i].id = 0;
148	}
149
150	err = mfd_add_devices(&pdev->dev, -1, cs5535_mfd_cells,
151			      ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
152	if (err) {
153		dev_err(&pdev->dev, "MFD add devices failed: %d\n", err);
154		goto err_disable;
155	}
156	cs5535_clone_olpc_cells();
157
158	dev_info(&pdev->dev, "%zu devices registered.\n",
159			ARRAY_SIZE(cs5535_mfd_cells));
160
161	return 0;
162
163err_disable:
164	pci_disable_device(pdev);
165	return err;
166}
167
168static void cs5535_mfd_remove(struct pci_dev *pdev)
169{
170	mfd_remove_devices(&pdev->dev);
171	pci_disable_device(pdev);
172}
173
174static const struct pci_device_id cs5535_mfd_pci_tbl[] = {
175	{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_CS5535_ISA) },
176	{ PCI_DEVICE(PCI_VENDOR_ID_AMD, PCI_DEVICE_ID_AMD_CS5536_ISA) },
177	{ 0, }
178};
179MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
180
181static struct pci_driver cs5535_mfd_driver = {
182	.name = DRV_NAME,
183	.id_table = cs5535_mfd_pci_tbl,
184	.probe = cs5535_mfd_probe,
185	.remove = cs5535_mfd_remove,
186};
187
188module_pci_driver(cs5535_mfd_driver);
189
190MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
191MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
192MODULE_LICENSE("GPL");
193