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1/*
2 * linux/arch/arm/mach-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/config.h>
27#include <linux/module.h>
28#include <linux/version.h>
29#include <linux/types.h>
30#include <linux/errno.h>
31#include <linux/kernel.h>
32#include <linux/init.h>
33#include <linux/spinlock.h>
34#include <linux/err.h>
35
36#include <asm/io.h>
37#include <asm/hardware/clock.h>
38#include <asm/arch/hardware.h>
39
40#define OCPI_BASE 0xfffec320
41#define OCPI_FAULT (OCPI_BASE + 0x00)
42#define OCPI_CMD_FAULT (OCPI_BASE + 0x04)
43#define OCPI_SINT0 (OCPI_BASE + 0x08)
44#define OCPI_TABORT (OCPI_BASE + 0x0c)
45#define OCPI_SINT1 (OCPI_BASE + 0x10)
46#define OCPI_PROT (OCPI_BASE + 0x14)
47#define OCPI_SEC (OCPI_BASE + 0x18)
48
49/* USB OHCI OCPI access error registers */
50#define HOSTUEADDR 0xfffba0e0
51#define HOSTUESTATUS 0xfffba0e4
52
53static struct clk *ocpi_ck;
54
55/*
56 * Enables device access to OMAP buses via the OCPI bridge
57 * FIXME: Add locking
58 */
59int ocpi_enable(void)
60{
61 unsigned int val;
62
63 if (!cpu_is_omap16xx())
64 return -ENODEV;
65
66 /* Make sure there's clock for OCPI */
67 clk_enable(ocpi_ck);
68
69 /* Enable access for OHCI in OCPI */
70 val = omap_readl(OCPI_PROT);
71 val &= ~0xff;
72 //val &= (1 << 0); /* Allow access only to EMIFS */
73 omap_writel(val, OCPI_PROT);
74
75 val = omap_readl(OCPI_SEC);
76 val &= ~0xff;
77 omap_writel(val, OCPI_SEC);
78
79 return 0;
80}
81EXPORT_SYMBOL(ocpi_enable);
82
83static int __init omap_ocpi_init(void)
84{
85 if (!cpu_is_omap16xx())
86 return -ENODEV;
87
88 ocpi_ck = clk_get(NULL, "l3_ocpi_ck");
89 if (IS_ERR(ocpi_ck))
90 return PTR_ERR(ocpi_ck);
91
92 clk_use(ocpi_ck);
93 ocpi_enable();
94 printk("OMAP OCPI interconnect driver loaded\n");
95
96 return 0;
97}
98
99static void __exit omap_ocpi_exit(void)
100{
101 /* REVISIT: Disable OCPI */
102
103 if (!cpu_is_omap16xx())
104 return;
105
106 clk_unuse(ocpi_ck);
107 clk_put(ocpi_ck);
108}
109
110MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>");
111MODULE_DESCRIPTION("OMAP OCPI bus controller module");
112MODULE_LICENSE("GPL");
113module_init(omap_ocpi_init);
114module_exit(omap_ocpi_exit);