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/pci.h>
14 #include <linux/scx200.h>
16 /* Verify that the configuration block really is there */
17 #define scx200_cb_probe(base) (inw((base) + SCx200_CBA) == (base))
21 MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
22 MODULE_DESCRIPTION("NatSemi SCx200 Driver");
23 MODULE_LICENSE("GPL");
25 unsigned scx200_gpio_base = 0;
26 long scx200_gpio_shadow[2];
28 unsigned scx200_cb_base = 0;
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) },
37 MODULE_DEVICE_TABLE(pci,scx200_tbl);
39 static int __devinit scx200_probe(struct pci_dev *, const struct pci_device_id *);
41 static struct pci_driver scx200_pci_driver = {
43 .id_table = scx200_tbl,
44 .probe = scx200_probe,
47 static DEFINE_SPINLOCK(scx200_gpio_config_lock);
49 static int __devinit scx200_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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);
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");
64 scx200_gpio_base = base;
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);
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;
75 pci_read_config_dword(pdev, SCx200_CBA_SCRATCH, &base);
76 if (scx200_cb_probe(base)) {
77 scx200_cb_base = base;
79 printk(KERN_WARNING NAME ": Configuration Block not found\n");
83 printk(KERN_INFO NAME ": Configuration Block base 0x%x\n", scx200_cb_base);
89 u32 scx200_gpio_configure(int index, u32 mask, u32 bits)
91 u32 config, new_config;
94 spin_lock_irqsave(&scx200_gpio_config_lock, flags);
96 outl(index, scx200_gpio_base + 0x20);
97 config = inl(scx200_gpio_base + 0x24);
99 new_config = (config & mask) | bits;
100 outl(new_config, scx200_gpio_base + 0x24);
102 spin_unlock_irqrestore(&scx200_gpio_config_lock, flags);
108 void scx200_gpio_dump(unsigned index)
110 u32 config = scx200_gpio_configure(index, ~0, 0);
111 printk(KERN_DEBUG "GPIO%02u: 0x%08lx", index, (unsigned long)config);
114 printk(" OE"); /* output enabled */
116 printk(" TS"); /* tristate */
118 printk(" PP"); /* push pull */
120 printk(" OD"); /* open drain */
122 printk(" PUE"); /* pull up enabled */
124 printk(" PUD"); /* pull up disabled */
126 printk(" LOCKED"); /* locked */
128 printk(" LEVEL"); /* level input */
130 printk(" EDGE"); /* edge input */
132 printk(" HI"); /* trigger on rising edge */
134 printk(" LO"); /* trigger on falling edge */
136 printk(" DEBOUNCE"); /* debounce */
141 static int __init scx200_init(void)
143 printk(KERN_INFO NAME ": NatSemi SCx200 Driver\n");
145 return pci_module_init(&scx200_pci_driver);
148 static void __exit scx200_cleanup(void)
150 pci_unregister_driver(&scx200_pci_driver);
151 release_region(scx200_gpio_base, SCx200_GPIO_SIZE);
154 module_init(scx200_init);
155 module_exit(scx200_cleanup);
157 EXPORT_SYMBOL(scx200_gpio_base);
158 EXPORT_SYMBOL(scx200_gpio_shadow);
159 EXPORT_SYMBOL(scx200_gpio_configure);
160 EXPORT_SYMBOL(scx200_cb_base);
164 compile-command: "make -k -C ../../.. SUBDIRS=arch/i386/kernel modules"