aboutsummaryrefslogtreecommitdiff
path: root/arch/arm/mach-omap/ocpi.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/arm/mach-omap/ocpi.c')
-rw-r--r--arch/arm/mach-omap/ocpi.c114
1 files changed, 114 insertions, 0 deletions
diff --git a/arch/arm/mach-omap/ocpi.c b/arch/arm/mach-omap/ocpi.c
new file mode 100644
index 000000000000..c9ced134a75d
--- /dev/null
+++ b/arch/arm/mach-omap/ocpi.c
@@ -0,0 +1,114 @@
+/*
+ * linux/arch/arm/mach-omap/ocpi.c
+ *
+ * Minimal OCP bus support for omap16xx
+ *
+ * Copyright (C) 2003 - 2005 Nokia Corporation
+ * Written by Tony Lindgren <tony@atomide.com>
+ *
+ * Modified for clock framework by Paul Mundt <paul.mundt@nokia.com>.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/config.h>
+#include <linux/module.h>
+#include <linux/version.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 <asm/io.h>
+#include <asm/hardware/clock.h>
+#include <asm/arch/hardware.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
+ * FIXME: Add locking
+ */
+int ocpi_enable(void)
+{
+ unsigned int val;
+
+ if (!cpu_is_omap16xx())
+ return -ENODEV;
+
+ /* Make sure there's clock for OCPI */
+ clk_enable(ocpi_ck);
+
+ /* 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_use(ocpi_ck);
+ ocpi_enable();
+ printk("OMAP OCPI interconnect driver loaded\n");
+
+ return 0;
+}
+
+static void __exit omap_ocpi_exit(void)
+{
+ /* REVISIT: Disable OCPI */
+
+ if (!cpu_is_omap16xx())
+ return;
+
+ clk_unuse(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);