diff options
Diffstat (limited to 'arch/i386/kernel/scx200.c')
| -rw-r--r-- | arch/i386/kernel/scx200.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/arch/i386/kernel/scx200.c b/arch/i386/kernel/scx200.c new file mode 100644 index 00000000000..69e203a0d33 --- /dev/null +++ b/arch/i386/kernel/scx200.c @@ -0,0 +1,167 @@ +/* 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: +*/ |