144 lines
3.4 KiB
C
144 lines
3.4 KiB
C
/* linux/arch/i386/kernel/scx200.c
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Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
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National Semiconductor SCx200 support. */
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#include <linux/config.h>
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#include <linux/module.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/pci.h>
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#include <linux/scx200.h>
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#define NAME "scx200"
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MODULE_AUTHOR("Christer Weinigel <wingel@nano-system.com>");
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MODULE_DESCRIPTION("NatSemi SCx200 Driver");
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MODULE_LICENSE("GPL");
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unsigned scx200_gpio_base = 0;
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long scx200_gpio_shadow[2];
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static struct pci_device_id scx200_tbl[] = {
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{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) },
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{ PCI_DEVICE(PCI_VENDOR_ID_NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) },
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{ },
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};
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MODULE_DEVICE_TABLE(pci,scx200_tbl);
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static int __devinit scx200_probe(struct pci_dev *, const struct pci_device_id *);
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static struct pci_driver scx200_pci_driver = {
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.name = "scx200",
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.id_table = scx200_tbl,
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.probe = scx200_probe,
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};
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spinlock_t scx200_gpio_lock = SPIN_LOCK_UNLOCKED;
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static spinlock_t scx200_gpio_config_lock = SPIN_LOCK_UNLOCKED;
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static int __devinit scx200_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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{
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int bank;
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unsigned base;
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base = pci_resource_start(pdev, 0);
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printk(KERN_INFO NAME ": GPIO base 0x%x\n", base);
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if (request_region(base, SCx200_GPIO_SIZE, "NatSemi SCx200 GPIO") == 0) {
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printk(KERN_ERR NAME ": can't allocate I/O for GPIOs\n");
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return -EBUSY;
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}
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scx200_gpio_base = base;
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/* read the current values driven on the GPIO signals */
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for (bank = 0; bank < 2; ++bank)
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scx200_gpio_shadow[bank] = inl(scx200_gpio_base + 0x10 * bank);
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return 0;
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}
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u32 scx200_gpio_configure(int index, u32 mask, u32 bits)
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{
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u32 config, new_config;
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unsigned long flags;
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spin_lock_irqsave(&scx200_gpio_config_lock, flags);
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outl(index, scx200_gpio_base + 0x20);
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config = inl(scx200_gpio_base + 0x24);
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new_config = (config & mask) | bits;
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outl(new_config, scx200_gpio_base + 0x24);
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spin_unlock_irqrestore(&scx200_gpio_config_lock, flags);
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return config;
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}
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void scx200_gpio_dump(unsigned index)
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{
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u32 config = scx200_gpio_configure(index, ~0, 0);
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printk(KERN_DEBUG "GPIO%02u: 0x%08lx", index, (unsigned long)config);
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if (config & 1)
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printk(" OE"); /* output enabled */
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else
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printk(" TS"); /* tristate */
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if (config & 2)
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printk(" PP"); /* push pull */
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else
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printk(" OD"); /* open drain */
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if (config & 4)
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printk(" PUE"); /* pull up enabled */
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else
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printk(" PUD"); /* pull up disabled */
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if (config & 8)
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printk(" LOCKED"); /* locked */
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if (config & 16)
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printk(" LEVEL"); /* level input */
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else
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printk(" EDGE"); /* edge input */
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if (config & 32)
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printk(" HI"); /* trigger on rising edge */
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else
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printk(" LO"); /* trigger on falling edge */
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if (config & 64)
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printk(" DEBOUNCE"); /* debounce */
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printk("\n");
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}
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int __init scx200_init(void)
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{
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printk(KERN_INFO NAME ": NatSemi SCx200 Driver\n");
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return pci_module_init(&scx200_pci_driver);
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}
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void __exit scx200_cleanup(void)
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{
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pci_unregister_driver(&scx200_pci_driver);
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release_region(scx200_gpio_base, SCx200_GPIO_SIZE);
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}
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module_init(scx200_init);
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module_exit(scx200_cleanup);
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EXPORT_SYMBOL(scx200_gpio_base);
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EXPORT_SYMBOL(scx200_gpio_shadow);
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EXPORT_SYMBOL(scx200_gpio_lock);
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EXPORT_SYMBOL(scx200_gpio_configure);
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EXPORT_SYMBOL(scx200_gpio_dump);
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/*
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Local variables:
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compile-command: "make -k -C ../../.. SUBDIRS=arch/i386/kernel modules"
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c-basic-offset: 8
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End:
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*/
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