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1da177e4 LT |
1 | /* linux/arch/i386/kernel/scx200.c |
2 | ||
3 | Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com> | |
4 | ||
5 | National Semiconductor SCx200 support. */ | |
6 | ||
7 | #include <linux/config.h> | |
8 | #include <linux/module.h> | |
9 | #include <linux/errno.h> | |
10 | #include <linux/kernel.h> | |
11 | #include <linux/init.h> | |
12 | #include <linux/pci.h> | |
13 | ||
14 | #include <linux/scx200.h> | |
15 | ||
16 | /* Verify that the configuration block really is there */ | |
17 | #define scx200_cb_probe(base) (inw((base) + SCx200_CBA) == (base)) | |
18 | ||
19 | #define NAME "scx200" | |
20 | ||
21 | MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>"); | |
22 | MODULE_DESCRIPTION("NatSemi SCx200 Driver"); | |
23 | MODULE_LICENSE("GPL"); | |
24 | ||
25 | unsigned scx200_gpio_base = 0; | |
26 | long scx200_gpio_shadow[2]; | |
27 | ||
28 | unsigned scx200_cb_base = 0; | |
29 | ||
30 | static struct pci_device_id scx200_tbl[] = { | |
31 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) }, | |
32 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) }, | |
33 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_XBUS) }, | |
34 | { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_XBUS) }, | |
35 | { }, | |
36 | }; | |
37 | MODULE_DEVICE_TABLE(pci,scx200_tbl); | |
38 | ||
39 | static int __devinit scx200_probe(struct pci_dev *, const struct pci_device_id *); | |
40 | ||
41 | static struct pci_driver scx200_pci_driver = { | |
42 | .name = "scx200", | |
43 | .id_table = scx200_tbl, | |
44 | .probe = scx200_probe, | |
45 | }; | |
46 | ||
47 | static DEFINE_SPINLOCK(scx200_gpio_config_lock); | |
48 | ||
49 | static int __devinit scx200_probe(struct pci_dev *pdev, const struct pci_device_id *ent) | |
50 | { | |
51 | int bank; | |
52 | unsigned base; | |
53 | ||
54 | if (pdev->device == PCI_DEVICE_ID_NS_SCx200_BRIDGE || | |
55 | pdev->device == PCI_DEVICE_ID_NS_SC1100_BRIDGE) { | |
56 | base = pci_resource_start(pdev, 0); | |
57 | printk(KERN_INFO NAME ": GPIO base 0x%x\n", base); | |
58 | ||
59 | if (request_region(base, SCx200_GPIO_SIZE, "NatSemi SCx200 GPIO") == 0) { | |
60 | printk(KERN_ERR NAME ": can't allocate I/O for GPIOs\n"); | |
61 | return -EBUSY; | |
62 | } | |
63 | ||
64 | scx200_gpio_base = base; | |
65 | ||
66 | /* read the current values driven on the GPIO signals */ | |
67 | for (bank = 0; bank < 2; ++bank) | |
68 | scx200_gpio_shadow[bank] = inl(scx200_gpio_base + 0x10 * bank); | |
69 | ||
70 | } else { | |
71 | /* find the base of the Configuration Block */ | |
72 | if (scx200_cb_probe(SCx200_CB_BASE_FIXED)) { | |
73 | scx200_cb_base = SCx200_CB_BASE_FIXED; | |
74 | } else { | |
75 | pci_read_config_dword(pdev, SCx200_CBA_SCRATCH, &base); | |
76 | if (scx200_cb_probe(base)) { | |
77 | scx200_cb_base = base; | |
78 | } else { | |
79 | printk(KERN_WARNING NAME ": Configuration Block not found\n"); | |
80 | return -ENODEV; | |
81 | } | |
82 | } | |
83 | printk(KERN_INFO NAME ": Configuration Block base 0x%x\n", scx200_cb_base); | |
84 | } | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
89 | u32 scx200_gpio_configure(int index, u32 mask, u32 bits) | |
90 | { | |
91 | u32 config, new_config; | |
92 | unsigned long flags; | |
93 | ||
94 | spin_lock_irqsave(&scx200_gpio_config_lock, flags); | |
95 | ||
96 | outl(index, scx200_gpio_base + 0x20); | |
97 | config = inl(scx200_gpio_base + 0x24); | |
98 | ||
99 | new_config = (config & mask) | bits; | |
100 | outl(new_config, scx200_gpio_base + 0x24); | |
101 | ||
102 | spin_unlock_irqrestore(&scx200_gpio_config_lock, flags); | |
103 | ||
104 | return config; | |
105 | } | |
106 | ||
107 | #if 0 | |
108 | void scx200_gpio_dump(unsigned index) | |
109 | { | |
110 | u32 config = scx200_gpio_configure(index, ~0, 0); | |
111 | printk(KERN_DEBUG "GPIO%02u: 0x%08lx", index, (unsigned long)config); | |
112 | ||
113 | if (config & 1) | |
114 | printk(" OE"); /* output enabled */ | |
115 | else | |
116 | printk(" TS"); /* tristate */ | |
117 | if (config & 2) | |
118 | printk(" PP"); /* push pull */ | |
119 | else | |
120 | printk(" OD"); /* open drain */ | |
121 | if (config & 4) | |
122 | printk(" PUE"); /* pull up enabled */ | |
123 | else | |
124 | printk(" PUD"); /* pull up disabled */ | |
125 | if (config & 8) | |
126 | printk(" LOCKED"); /* locked */ | |
127 | if (config & 16) | |
128 | printk(" LEVEL"); /* level input */ | |
129 | else | |
130 | printk(" EDGE"); /* edge input */ | |
131 | if (config & 32) | |
132 | printk(" HI"); /* trigger on rising edge */ | |
133 | else | |
134 | printk(" LO"); /* trigger on falling edge */ | |
135 | if (config & 64) | |
136 | printk(" DEBOUNCE"); /* debounce */ | |
137 | printk("\n"); | |
138 | } | |
139 | #endif /* 0 */ | |
140 | ||
141 | static int __init scx200_init(void) | |
142 | { | |
143 | printk(KERN_INFO NAME ": NatSemi SCx200 Driver\n"); | |
144 | ||
145 | return pci_module_init(&scx200_pci_driver); | |
146 | } | |
147 | ||
148 | static void __exit scx200_cleanup(void) | |
149 | { | |
150 | pci_unregister_driver(&scx200_pci_driver); | |
151 | release_region(scx200_gpio_base, SCx200_GPIO_SIZE); | |
152 | } | |
153 | ||
154 | module_init(scx200_init); | |
155 | module_exit(scx200_cleanup); | |
156 | ||
157 | EXPORT_SYMBOL(scx200_gpio_base); | |
158 | EXPORT_SYMBOL(scx200_gpio_shadow); | |
159 | EXPORT_SYMBOL(scx200_gpio_configure); | |
160 | EXPORT_SYMBOL(scx200_cb_base); | |
161 | ||
162 | /* | |
163 | Local variables: | |
164 | compile-command: "make -k -C ../../.. SUBDIRS=arch/i386/kernel modules" | |
165 | c-basic-offset: 8 | |
166 | End: | |
167 | */ |