x86: process.c declare c1e_remove_cpu before they get used
[linux-2.6] / arch / x86 / kernel / scx200_32.c
1 /*
2  *  Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
3  *
4  *  National Semiconductor SCx200 support.
5  */
6
7 #include <linux/module.h>
8 #include <linux/errno.h>
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/mutex.h>
12 #include <linux/pci.h>
13
14 #include <linux/scx200.h>
15 #include <linux/scx200_gpio.h>
16
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
22 MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
23 MODULE_DESCRIPTION("NatSemi SCx200 Driver");
24 MODULE_LICENSE("GPL");
25
26 unsigned scx200_gpio_base = 0;
27 unsigned long scx200_gpio_shadow[2];
28
29 unsigned scx200_cb_base = 0;
30
31 static 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 };
38 MODULE_DEVICE_TABLE(pci,scx200_tbl);
39
40 static int __devinit scx200_probe(struct pci_dev *, const struct pci_device_id *);
41
42 static struct pci_driver scx200_pci_driver = {
43         .name = "scx200",
44         .id_table = scx200_tbl,
45         .probe = scx200_probe,
46 };
47
48 static DEFINE_MUTEX(scx200_gpio_config_lock);
49
50 static void __devinit scx200_init_shadow(void)
51 {
52         int bank;
53
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
59 static int __devinit scx200_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
60 {
61         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
68                 if (!request_region(base, SCx200_GPIO_SIZE, "NatSemi SCx200 GPIO")) {
69                         printk(KERN_ERR NAME ": can't allocate I/O for GPIOs\n");
70                         return -EBUSY;
71                 }
72
73                 scx200_gpio_base = base;
74                 scx200_init_shadow();
75
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
95 u32 scx200_gpio_configure(unsigned index, u32 mask, u32 bits)
96 {
97         u32 config, new_config;
98
99         mutex_lock(&scx200_gpio_config_lock);
100
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
107         mutex_unlock(&scx200_gpio_config_lock);
108
109         return config;
110 }
111
112 static int __init scx200_init(void)
113 {
114         printk(KERN_INFO NAME ": NatSemi SCx200 Driver\n");
115
116         return pci_register_driver(&scx200_pci_driver);
117 }
118
119 static void __exit scx200_cleanup(void)
120 {
121         pci_unregister_driver(&scx200_pci_driver);
122         release_region(scx200_gpio_base, SCx200_GPIO_SIZE);
123 }
124
125 module_init(scx200_init);
126 module_exit(scx200_cleanup);
127
128 EXPORT_SYMBOL(scx200_gpio_base);
129 EXPORT_SYMBOL(scx200_gpio_shadow);
130 EXPORT_SYMBOL(scx200_gpio_configure);
131 EXPORT_SYMBOL(scx200_cb_base);