Root/drivers/mfd/cs5535-mfd.c

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, NULL);
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
189module_pci_driver(cs5535_mfd_driver);
190
191MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
192MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
193MODULE_LICENSE("GPL");
194

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