Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*
 *  Copyright (c) 2001,2002 Christer Weinigel <wingel@nano-system.com>
 *
 *  National Semiconductor SCx200 support.
 */
 
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/mutex.h>
#include <linux/pci.h>
 
#include <linux/scx200.h>
#include <linux/scx200_gpio.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;
unsigned 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_MUTEX(scx200_gpio_config_lock);
 
static void __devinit scx200_init_shadow(void)
{
	int bank;
 
	/* 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);
}
 
static int __devinit scx200_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
	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;
		scx200_init_shadow();
 
	} 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(unsigned index, u32 mask, u32 bits)
{
	u32 config, new_config;
 
	mutex_lock(&scx200_gpio_config_lock);
 
	outl(index, scx200_gpio_base + 0x20);
	config = inl(scx200_gpio_base + 0x24);
 
	new_config = (config & mask) | bits;
	outl(new_config, scx200_gpio_base + 0x24);
 
	mutex_unlock(&scx200_gpio_config_lock);
 
	return config;
}
 
static int __init scx200_init(void)
{
	printk(KERN_INFO NAME ": NatSemi SCx200 Driver\n");
 
	return pci_register_driver(&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);