Commit | Line | Data |
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835c34a1 DJ |
1 | /* |
2 | * Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com> | |
3 | * | |
4 | * National Semiconductor SCx200 support. | |
5 | */ | |
1da177e4 | 6 | |
1da177e4 LT |
7 | #include <linux/module.h> |
8 | #include <linux/errno.h> | |
9 | #include <linux/kernel.h> | |
10 | #include <linux/init.h> | |
8bcf6135 | 11 | #include <linux/mutex.h> |
1da177e4 LT |
12 | #include <linux/pci.h> |
13 | ||
14 | #include <linux/scx200.h> | |
cc658cfe | 15 | #include <linux/scx200_gpio.h> |
1da177e4 LT |
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; | |
64b33619 | 27 | unsigned long scx200_gpio_shadow[2]; |
1da177e4 LT |
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 | ||
8bcf6135 | 48 | static DEFINE_MUTEX(scx200_gpio_config_lock); |
1da177e4 | 49 | |
9b170b8f | 50 | static void __devinit scx200_init_shadow(void) |
1da177e4 LT |
51 | { |
52 | int bank; | |
9b170b8f JC |
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 | { | |
1da177e4 LT |
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") == 0) { | |
69 | printk(KERN_ERR NAME ": can't allocate I/O for GPIOs\n"); | |
70 | return -EBUSY; | |
71 | } | |
72 | ||
73 | scx200_gpio_base = base; | |
9b170b8f | 74 | scx200_init_shadow(); |
1da177e4 LT |
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 | ||
55b8c045 | 95 | u32 scx200_gpio_configure(unsigned index, u32 mask, u32 bits) |
1da177e4 LT |
96 | { |
97 | u32 config, new_config; | |
1da177e4 | 98 | |
8bcf6135 | 99 | mutex_lock(&scx200_gpio_config_lock); |
1da177e4 LT |
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 | ||
8bcf6135 | 107 | mutex_unlock(&scx200_gpio_config_lock); |
1da177e4 LT |
108 | |
109 | return config; | |
110 | } | |
111 | ||
1da177e4 LT |
112 | static int __init scx200_init(void) |
113 | { | |
114 | printk(KERN_INFO NAME ": NatSemi SCx200 Driver\n"); | |
115 | ||
d1d6da8f | 116 | return pci_register_driver(&scx200_pci_driver); |
1da177e4 LT |
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); |