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