130 строки
3.1 KiB
C
130 строки
3.1 KiB
C
/*
|
|
* 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))
|
|
|
|
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_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_BRIDGE) },
|
|
{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SC1100_BRIDGE) },
|
|
{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SCx200_XBUS) },
|
|
{ PCI_VDEVICE(NS, PCI_DEVICE_ID_NS_SC1100_XBUS) },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(pci,scx200_tbl);
|
|
|
|
static int 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 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 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);
|
|
pr_info("GPIO base 0x%x\n", base);
|
|
|
|
if (!request_region(base, SCx200_GPIO_SIZE,
|
|
"NatSemi SCx200 GPIO")) {
|
|
pr_err("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 {
|
|
pr_warn("Configuration Block not found\n");
|
|
return -ENODEV;
|
|
}
|
|
}
|
|
pr_info("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)
|
|
{
|
|
pr_info("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);
|