[deliverable/linux.git] / arch / arm / mach-omap1 / ocpi.c

/*
 * 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);
Commit	Line	Data
5e1c5ff4 TL	1	/*
	2	* linux/arch/arm/plat-omap/ocpi.c
	3	*
	4	* Minimal OCP bus support for omap16xx
	5	*
	6	* Copyright (C) 2003 - 2005 Nokia Corporation
6f3c1af2	7	* Copyright (C) 2012 Texas Instruments, Inc.
5e1c5ff4 TL	8	* Written by Tony Lindgren <tony@atomide.com>
	9	*
	10	* Modified for clock framework by Paul Mundt <paul.mundt@nokia.com>.
	11	*
	12	* This program is free software; you can redistribute it and/or modify
	13	* it under the terms of the GNU General Public License as published by
	14	* the Free Software Foundation; either version 2 of the License, or
	15	* (at your option) any later version.
	16	*
	17	* This program is distributed in the hope that it will be useful,
	18	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	19	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	20	* GNU General Public License for more details.
	21	*
	22	* You should have received a copy of the GNU General Public License
	23	* along with this program; if not, write to the Free Software
	24	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	25	*/
	26
5e1c5ff4	27	#include <linux/module.h>
5e1c5ff4 TL	28	#include <linux/types.h>
	29	#include <linux/errno.h>
	30	#include <linux/kernel.h>
	31	#include <linux/init.h>
	32	#include <linux/spinlock.h>
	33	#include <linux/err.h>
f8ce2547	34	#include <linux/clk.h>
fced80c7	35	#include <linux/io.h>
5e1c5ff4	36
a09e64fb	37	#include <mach/hardware.h>
5e1c5ff4	38
6f3c1af2 PW	39	#include "common.h"
6f3c1af2 PW	40
5e1c5ff4 TL	41	#define OCPI_BASE 0xfffec320
	42	#define OCPI_FAULT (OCPI_BASE + 0x00)
	43	#define OCPI_CMD_FAULT (OCPI_BASE + 0x04)
	44	#define OCPI_SINT0 (OCPI_BASE + 0x08)
	45	#define OCPI_TABORT (OCPI_BASE + 0x0c)
	46	#define OCPI_SINT1 (OCPI_BASE + 0x10)
	47	#define OCPI_PROT (OCPI_BASE + 0x14)
	48	#define OCPI_SEC (OCPI_BASE + 0x18)
	49
	50	/* USB OHCI OCPI access error registers */
	51	#define HOSTUEADDR 0xfffba0e0
	52	#define HOSTUESTATUS 0xfffba0e4
	53
	54	static struct clk *ocpi_ck;
	55
	56	/*
	57	* Enables device access to OMAP buses via the OCPI bridge
	58	* FIXME: Add locking
	59	*/
	60	int ocpi_enable(void)
	61	{
	62	unsigned int val;
	63
	64	if (!cpu_is_omap16xx())
	65	return -ENODEV;
	66
5e1c5ff4 TL	67	/* Enable access for OHCI in OCPI */
	68	val = omap_readl(OCPI_PROT);
	69	val &= ~0xff;
6f3c1af2	70	/* val &= (1 << 0); Allow access only to EMIFS */
5e1c5ff4 TL	71	omap_writel(val, OCPI_PROT);
	72
	73	val = omap_readl(OCPI_SEC);
	74	val &= ~0xff;
	75	omap_writel(val, OCPI_SEC);
	76
	77	return 0;
	78	}
	79	EXPORT_SYMBOL(ocpi_enable);
	80
	81	static int __init omap_ocpi_init(void)
	82	{
	83	if (!cpu_is_omap16xx())
	84	return -ENODEV;
	85
	86	ocpi_ck = clk_get(NULL, "l3_ocpi_ck");
	87	if (IS_ERR(ocpi_ck))
	88	return PTR_ERR(ocpi_ck);
	89
30ff720b	90	clk_enable(ocpi_ck);
5e1c5ff4	91	ocpi_enable();
6f3c1af2	92	pr_info("OMAP OCPI interconnect driver loaded\n");
5e1c5ff4 TL	93
	94	return 0;
	95	}
	96
	97	static void __exit omap_ocpi_exit(void)
	98	{
	99	/* REVISIT: Disable OCPI */
	100
	101	if (!cpu_is_omap16xx())
	102	return;
	103
30ff720b	104	clk_disable(ocpi_ck);
5e1c5ff4 TL	105	clk_put(ocpi_ck);
	106	}
	107
	108	MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
	109	MODULE_DESCRIPTION("OMAP OCPI bus controller module");
	110	MODULE_LICENSE("GPL");
	111	module_init(omap_ocpi_init);
	112	module_exit(omap_ocpi_exit);