/* linux/arch/i386/kernel/scx200.c Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com> National Semiconductor SCx200 support. */ #include <linux/config.h> #include <linux/module.h> #include <linux/errno.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/pci.h> #include <linux/scx200.h> /* Verify that the configuration block really is there */ #define scx200_cb_probe(base) (inw((base) + SCx200_CBA) == (base)) #define NAME "scx200" MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>"); MODULE_DESCRIPTION("NatSemi SCx200 Driver"); MODULE_LICENSE("GPL"); unsigned scx200_gpio_base = 0; long scx200_gpio_shadow[2]; unsigned scx200_cb_base = 0; static struct pci_device_id scx200_tbl[] = { { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) }, { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) }, { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_XBUS) }, { PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_XBUS) }, { }, }; MODULE_DEVICE_TABLE(pci,scx200_tbl); static int __devinit scx200_probe(struct pci_dev *, const struct pci_device_id *); static struct pci_driver scx200_pci_driver = { .name = "scx200", .id_table = scx200_tbl, .probe = scx200_probe, }; static DEFINE_SPINLOCK(scx200_gpio_config_lock); static int __devinit scx200_probe(struct pci_dev *pdev, const struct pci_device_id *ent) { int bank; unsigned base; if (pdev->device == PCI_DEVICE_ID_NS_SCx200_BRIDGE || pdev->device == PCI_DEVICE_ID_NS_SC1100_BRIDGE) { base = pci_resource_start(pdev, 0); printk(KERN_INFO NAME ": GPIO base 0x%x\n", base); if (request_region(base, SCx200_GPIO_SIZE, "NatSemi SCx200 GPIO") == 0) { printk(KERN_ERR NAME ": can't allocate I/O for GPIOs\n"); return -EBUSY; } scx200_gpio_base = base; /* read the current values driven on the GPIO signals */ for (bank = 0; bank < 2; ++bank) scx200_gpio_shadow[bank] = inl(scx200_gpio_base + 0x10 * bank); } else { /* find the base of the Configuration Block */ if (scx200_cb_probe(SCx200_CB_BASE_FIXED)) { scx200_cb_base = SCx200_CB_BASE_FIXED; } else { pci_read_config_dword(pdev, SCx200_CBA_SCRATCH, &base); if (scx200_cb_probe(base)) { scx200_cb_base = base; } else { printk(KERN_WARNING NAME ": Configuration Block not found\n"); return -ENODEV; } } printk(KERN_INFO NAME ": Configuration Block base 0x%x\n", scx200_cb_base); } return 0; } u32 scx200_gpio_configure(int index, u32 mask, u32 bits) { u32 config, new_config; unsigned long flags; spin_lock_irqsave(&scx200_gpio_config_lock, flags); outl(index, scx200_gpio_base + 0x20); config = inl(scx200_gpio_base + 0x24); new_config = (config & mask) | bits; outl(new_config, scx200_gpio_base + 0x24); spin_unlock_irqrestore(&scx200_gpio_config_lock, flags); return config; } #if 0 void scx200_gpio_dump(unsigned index) { u32 config = scx200_gpio_configure(index, ~0, 0); printk(KERN_DEBUG "GPIO%02u: 0x%08lx", index, (unsigned long)config); if (config & 1) printk(" OE"); /* output enabled */ else printk(" TS"); /* tristate */ if (config & 2) printk(" PP"); /* push pull */ else printk(" OD"); /* open drain */ if (config & 4) printk(" PUE"); /* pull up enabled */ else printk(" PUD"); /* pull up disabled */ if (config & 8) printk(" LOCKED"); /* locked */ if (config & 16) printk(" LEVEL"); /* level input */ else printk(" EDGE"); /* edge input */ if (config & 32) printk(" HI"); /* trigger on rising edge */ else printk(" LO"); /* trigger on falling edge */ if (config & 64) printk(" DEBOUNCE"); /* debounce */ printk("\n"); } #endif /* 0 */ static int __init scx200_init(void) { printk(KERN_INFO NAME ": NatSemi SCx200 Driver\n"); return pci_module_init(&scx200_pci_driver); } static void __exit scx200_cleanup(void) { pci_unregister_driver(&scx200_pci_driver); release_region(scx200_gpio_base, SCx200_GPIO_SIZE); } module_init(scx200_init); module_exit(scx200_cleanup); EXPORT_SYMBOL(scx200_gpio_base); EXPORT_SYMBOL(scx200_gpio_shadow); EXPORT_SYMBOL(scx200_gpio_configure); EXPORT_SYMBOL(scx200_cb_base); /* Local variables: compile-command: "make -k -C ../../.. SUBDIRS=arch/i386/kernel modules" c-basic-offset: 8 End: */