blob: 7e004acbe52648918fd691765f6cafc86297b42b [file] [log] [blame]
Dave Jones835c34a2007-10-12 21:10:53 -04001/*
2 * Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
3 *
4 * National Semiconductor SCx200 support.
5 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07006
Linus Torvalds1da177e2005-04-16 15:20:36 -07007#include <linux/module.h>
8#include <linux/errno.h>
9#include <linux/kernel.h>
10#include <linux/init.h>
Jim Cromie8bcf6132006-06-27 02:54:25 -070011#include <linux/mutex.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/pci.h>
13
14#include <linux/scx200.h>
Adrian Bunkcc658cf2005-11-07 00:58:37 -080015#include <linux/scx200_gpio.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016
17/* Verify that the configuration block really is there */
18#define scx200_cb_probe(base) (inw((base) + SCx200_CBA) == (base))
19
20#define NAME "scx200"
21
22MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
23MODULE_DESCRIPTION("NatSemi SCx200 Driver");
24MODULE_LICENSE("GPL");
25
26unsigned scx200_gpio_base = 0;
Al Viro64b33612007-10-14 19:35:20 +010027unsigned long scx200_gpio_shadow[2];
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29unsigned scx200_cb_base = 0;
30
31static struct pci_device_id scx200_tbl[] = {
32 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) },
33 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) },
34 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_XBUS) },
35 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_XBUS) },
36 { },
37};
38MODULE_DEVICE_TABLE(pci,scx200_tbl);
39
40static int __devinit scx200_probe(struct pci_dev *, const struct pci_device_id *);
41
42static struct pci_driver scx200_pci_driver = {
43 .name = "scx200",
44 .id_table = scx200_tbl,
45 .probe = scx200_probe,
46};
47
Jim Cromie8bcf6132006-06-27 02:54:25 -070048static DEFINE_MUTEX(scx200_gpio_config_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070049
Jim Cromie9b170b82006-06-27 02:54:17 -070050static void __devinit scx200_init_shadow(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070051{
52 int bank;
Jim Cromie9b170b82006-06-27 02:54:17 -070053
54 /* read the current values driven on the GPIO signals */
55 for (bank = 0; bank < 2; ++bank)
56 scx200_gpio_shadow[bank] = inl(scx200_gpio_base + 0x10 * bank);
57}
58
59static int __devinit scx200_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
60{
Linus Torvalds1da177e2005-04-16 15:20:36 -070061 unsigned base;
62
63 if (pdev->device == PCI_DEVICE_ID_NS_SCx200_BRIDGE ||
64 pdev->device == PCI_DEVICE_ID_NS_SC1100_BRIDGE) {
65 base = pci_resource_start(pdev, 0);
66 printk(KERN_INFO NAME ": GPIO base 0x%x\n", base);
67
Harvey Harrison706b7e12008-01-31 22:05:45 +010068 if (!request_region(base, SCx200_GPIO_SIZE, "NatSemi SCx200 GPIO")) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 printk(KERN_ERR NAME ": can't allocate I/O for GPIOs\n");
70 return -EBUSY;
71 }
72
73 scx200_gpio_base = base;
Jim Cromie9b170b82006-06-27 02:54:17 -070074 scx200_init_shadow();
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76 } else {
77 /* find the base of the Configuration Block */
78 if (scx200_cb_probe(SCx200_CB_BASE_FIXED)) {
79 scx200_cb_base = SCx200_CB_BASE_FIXED;
80 } else {
81 pci_read_config_dword(pdev, SCx200_CBA_SCRATCH, &base);
82 if (scx200_cb_probe(base)) {
83 scx200_cb_base = base;
84 } else {
85 printk(KERN_WARNING NAME ": Configuration Block not found\n");
86 return -ENODEV;
87 }
88 }
89 printk(KERN_INFO NAME ": Configuration Block base 0x%x\n", scx200_cb_base);
90 }
91
92 return 0;
93}
94
Jim Cromie55b8c042006-06-27 02:54:15 -070095u32 scx200_gpio_configure(unsigned index, u32 mask, u32 bits)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
97 u32 config, new_config;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098
Jim Cromie8bcf6132006-06-27 02:54:25 -070099 mutex_lock(&scx200_gpio_config_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
101 outl(index, scx200_gpio_base + 0x20);
102 config = inl(scx200_gpio_base + 0x24);
103
104 new_config = (config & mask) | bits;
105 outl(new_config, scx200_gpio_base + 0x24);
106
Jim Cromie8bcf6132006-06-27 02:54:25 -0700107 mutex_unlock(&scx200_gpio_config_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108
109 return config;
110}
111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112static int __init scx200_init(void)
113{
114 printk(KERN_INFO NAME ": NatSemi SCx200 Driver\n");
115
Richard Knutssond1d6da82005-11-30 00:59:14 +0100116 return pci_register_driver(&scx200_pci_driver);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117}
118
119static void __exit scx200_cleanup(void)
120{
121 pci_unregister_driver(&scx200_pci_driver);
122 release_region(scx200_gpio_base, SCx200_GPIO_SIZE);
123}
124
125module_init(scx200_init);
126module_exit(scx200_cleanup);
127
128EXPORT_SYMBOL(scx200_gpio_base);
129EXPORT_SYMBOL(scx200_gpio_shadow);
130EXPORT_SYMBOL(scx200_gpio_configure);
131EXPORT_SYMBOL(scx200_cb_base);