1 /* linux/arch/i386/kernel/scx200.c
3 Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
5 National Semiconductor SCx200 support. */
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/mutex.h>
13 #include <linux/pci.h>
15 #include <linux/scx200.h>
16 #include <linux/scx200_gpio.h>
18 /* Verify that the configuration block really is there */
19 #define scx200_cb_probe(base) (inw((base) + SCx200_CBA) == (base))
23 MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
24 MODULE_DESCRIPTION("NatSemi SCx200 Driver");
25 MODULE_LICENSE("GPL");
27 unsigned scx200_gpio_base = 0;
28 long scx200_gpio_shadow[2];
30 unsigned scx200_cb_base = 0;
32 static struct pci_device_id scx200_tbl[] = {
33 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) },
34 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) },
35 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_XBUS) },
36 { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_XBUS) },
39 MODULE_DEVICE_TABLE(pci,scx200_tbl);
41 static int __devinit scx200_probe(struct pci_dev *, const struct pci_device_id *);
43 static struct pci_driver scx200_pci_driver = {
45 .id_table = scx200_tbl,
46 .probe = scx200_probe,
49 static DEFINE_MUTEX(scx200_gpio_config_lock);
51 static void __devinit scx200_init_shadow(void)
55 /* read the current values driven on the GPIO signals */
56 for (bank = 0; bank < 2; ++bank)
57 scx200_gpio_shadow[bank] = inl(scx200_gpio_base + 0x10 * bank);
60 static int __devinit scx200_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
64 if (pdev->device == PCI_DEVICE_ID_NS_SCx200_BRIDGE ||
65 pdev->device == PCI_DEVICE_ID_NS_SC1100_BRIDGE) {
66 base = pci_resource_start(pdev, 0);
67 printk(KERN_INFO NAME ": GPIO base 0x%x\n", base);
69 if (request_region(base, SCx200_GPIO_SIZE, "NatSemi SCx200 GPIO") == 0) {
70 printk(KERN_ERR NAME ": can't allocate I/O for GPIOs\n");
74 scx200_gpio_base = base;
78 /* find the base of the Configuration Block */
79 if (scx200_cb_probe(SCx200_CB_BASE_FIXED)) {
80 scx200_cb_base = SCx200_CB_BASE_FIXED;
82 pci_read_config_dword(pdev, SCx200_CBA_SCRATCH, &base);
83 if (scx200_cb_probe(base)) {
84 scx200_cb_base = base;
86 printk(KERN_WARNING NAME ": Configuration Block not found\n");
90 printk(KERN_INFO NAME ": Configuration Block base 0x%x\n", scx200_cb_base);
96 u32 scx200_gpio_configure(unsigned index, u32 mask, u32 bits)
98 u32 config, new_config;
100 mutex_lock(&scx200_gpio_config_lock);
102 outl(index, scx200_gpio_base + 0x20);
103 config = inl(scx200_gpio_base + 0x24);
105 new_config = (config & mask) | bits;
106 outl(new_config, scx200_gpio_base + 0x24);
108 mutex_unlock(&scx200_gpio_config_lock);
113 static int __init scx200_init(void)
115 printk(KERN_INFO NAME ": NatSemi SCx200 Driver\n");
117 return pci_register_driver(&scx200_pci_driver);
120 static void __exit scx200_cleanup(void)
122 pci_unregister_driver(&scx200_pci_driver);
123 release_region(scx200_gpio_base, SCx200_GPIO_SIZE);
126 module_init(scx200_init);
127 module_exit(scx200_cleanup);
129 EXPORT_SYMBOL(scx200_gpio_base);
130 EXPORT_SYMBOL(scx200_gpio_shadow);
131 EXPORT_SYMBOL(scx200_gpio_configure);
132 EXPORT_SYMBOL(scx200_cb_base);