ocpi.c
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/*
* 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>.
*
* 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/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 <mach/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
* FIXME: Add locking
*/
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_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(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);