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);
132