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 000000000000..69e203a0d330
--- /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:
+*/