2 files changed, 133 insertions, 0 deletions
diff --git a/arch/x86/platform/scx200/Makefile b/arch/x86/platform/scx200/Makefile
new file mode 100644
index 000000000..981b3e430
--- /dev/null
+++ b/arch/x86/platform/scx200/Makefile
@@ -0,0 +1,3 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_SCx200)		+= scx200.o
+scx200-y			+= scx200_32.o
diff --git a/arch/x86/platform/scx200/scx200_32.c b/arch/x86/platform/scx200/scx200_32.c
new file mode 100644
index 000000000..80662b720
--- /dev/null
+++ b/arch/x86/platform/scx200/scx200_32.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ *  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);