2 * cs5535-mfd.c - core MFD driver for CS5535/CS5536 southbridges
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.
9 * Copyright (c) 2010 Andres Salomon <dilinger@queued.net>
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.
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.
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.
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>
32 #define DRV_NAME "cs5535-mfd"
34 enum cs5535_mfd_bars {
43 static int cs5535_mfd_res_enable(struct platform_device *pdev)
47 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
49 dev_err(&pdev->dev, "can't fetch device resource info\n");
53 if (!request_region(res->start, resource_size(res), DRV_NAME)) {
54 dev_err(&pdev->dev, "can't request region\n");
61 static int cs5535_mfd_res_disable(struct platform_device *pdev)
64 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
66 dev_err(&pdev->dev, "can't fetch device resource info\n");
70 release_region(res->start, resource_size(res));
74 static struct resource cs5535_mfd_resources[NR_BARS];
76 static struct mfd_cell cs5535_mfd_cells[] = {
81 .resources = &cs5535_mfd_resources[SMB_BAR],
85 .name = "cs5535-gpio",
87 .resources = &cs5535_mfd_resources[GPIO_BAR],
91 .name = "cs5535-mfgpt",
93 .resources = &cs5535_mfd_resources[MFGPT_BAR],
99 .resources = &cs5535_mfd_resources[PMS_BAR],
101 .enable = cs5535_mfd_res_enable,
102 .disable = cs5535_mfd_res_disable,
106 .name = "cs5535-acpi",
108 .resources = &cs5535_mfd_resources[ACPI_BAR],
110 .enable = cs5535_mfd_res_enable,
111 .disable = cs5535_mfd_res_disable,
116 static void cs5535_clone_olpc_cells(void)
118 const char *acpi_clones[] = { "olpc-xo1-pm-acpi", "olpc-xo1-sci-acpi" };
120 if (!machine_is_olpc())
123 mfd_clone_cell("cs5535-acpi", acpi_clones, ARRAY_SIZE(acpi_clones));
126 static void cs5535_clone_olpc_cells(void) { }
129 static int cs5535_mfd_probe(struct pci_dev *pdev,
130 const struct pci_device_id *id)
134 err = pci_enable_device(pdev);
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];
143 r->flags = IORESOURCE_IO;
144 r->start = pci_resource_start(pdev, bar);
145 r->end = pci_resource_end(pdev, bar);
147 /* id is used for temporarily storing BAR; unset it now */
148 cs5535_mfd_cells[i].id = 0;
151 err = mfd_add_devices(&pdev->dev, -1, cs5535_mfd_cells,
152 ARRAY_SIZE(cs5535_mfd_cells), NULL, 0, NULL);
154 dev_err(&pdev->dev, "MFD add devices failed: %d\n", err);
157 cs5535_clone_olpc_cells();
159 dev_info(&pdev->dev, "%zu devices registered.\n",
160 ARRAY_SIZE(cs5535_mfd_cells));
165 pci_disable_device(pdev);
169 static void cs5535_mfd_remove(struct pci_dev *pdev)
171 mfd_remove_devices(&pdev->dev);
172 pci_disable_device(pdev);
175 static const struct pci_device_id 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) },
180 MODULE_DEVICE_TABLE(pci, cs5535_mfd_pci_tbl);
182 static struct pci_driver cs5535_mfd_driver = {
184 .id_table = cs5535_mfd_pci_tbl,
185 .probe = cs5535_mfd_probe,
186 .remove = cs5535_mfd_remove,
189 module_pci_driver(cs5535_mfd_driver);
191 MODULE_AUTHOR("Andres Salomon <dilinger@queued.net>");
192 MODULE_DESCRIPTION("MFD driver for CS5535/CS5536 southbridge's ISA PCI device");
193 MODULE_LICENSE("GPL");