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/* 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:
*/
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