1 files changed, 98 insertions, 0 deletions
diff --git a/arch/arm/mach-omap1/ocpi.c b/arch/arm/mach-omap1/ocpi.c
new file mode 100644
index 000000000..d48f72657
--- /dev/null
+++ b/arch/arm/mach-omap1/ocpi.c
@@ -0,0 +1,98 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * linux/arch/arm/plat-omap/ocpi.c
+ *
+ * Minimal OCP bus support for omap16xx
+ *
+ * Copyright (C) 2003 - 2005 Nokia Corporation
+ * Copyright (C) 2012 Texas Instruments, Inc.
+ * Written by Tony Lindgren <tony@atomide.com>
+ *
+ * Modified for clock framework by Paul Mundt <paul.mundt@nokia.com>.
+ */
+
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/spinlock.h>
+#include <linux/err.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/soc/ti/omap1-io.h>
+
+#include "hardware.h"
+#include "common.h"
+
+#define OCPI_BASE		0xfffec320
+#define OCPI_FAULT		(OCPI_BASE + 0x00)
+#define OCPI_CMD_FAULT		(OCPI_BASE + 0x04)
+#define OCPI_SINT0		(OCPI_BASE + 0x08)
+#define OCPI_TABORT		(OCPI_BASE + 0x0c)
+#define OCPI_SINT1		(OCPI_BASE + 0x10)
+#define OCPI_PROT		(OCPI_BASE + 0x14)
+#define OCPI_SEC		(OCPI_BASE + 0x18)
+
+/* USB OHCI OCPI access error registers */
+#define HOSTUEADDR	0xfffba0e0
+#define HOSTUESTATUS	0xfffba0e4
+
+static struct clk *ocpi_ck;
+
+/*
+ * Enables device access to OMAP buses via the OCPI bridge
+ */
+int ocpi_enable(void)
+{
+	unsigned int val;
+
+	if (!cpu_is_omap16xx())
+		return -ENODEV;
+
+	/* Enable access for OHCI in OCPI */
+	val = omap_readl(OCPI_PROT);
+	val &= ~0xff;
+	/* val &= (1 << 0);	 Allow access only to EMIFS */
+	omap_writel(val, OCPI_PROT);
+
+	val = omap_readl(OCPI_SEC);
+	val &= ~0xff;
+	omap_writel(val, OCPI_SEC);
+
+	return 0;
+}
+EXPORT_SYMBOL(ocpi_enable);
+
+static int __init omap_ocpi_init(void)
+{
+	if (!cpu_is_omap16xx())
+		return -ENODEV;
+
+	ocpi_ck = clk_get(NULL, "l3_ocpi_ck");
+	if (IS_ERR(ocpi_ck))
+		return PTR_ERR(ocpi_ck);
+
+	clk_prepare_enable(ocpi_ck);
+	ocpi_enable();
+	pr_info("OMAP OCPI interconnect driver loaded\n");
+
+	return 0;
+}
+
+static void __exit omap_ocpi_exit(void)
+{
+	/* REVISIT: Disable OCPI */
+
+	if (!cpu_is_omap16xx())
+		return;
+
+	clk_disable_unprepare(ocpi_ck);
+	clk_put(ocpi_ck);
+}
+
+MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
+MODULE_DESCRIPTION("OMAP OCPI bus controller module");
+MODULE_LICENSE("GPL");
+module_init(omap_ocpi_init);
+module_exit(omap_ocpi_exit);