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1da177e4 LT |
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 | ||
53 | static struct clk *ocpi_ck; | |
54 | ||
55 | /* | |
56 | * Enables device access to OMAP buses via the OCPI bridge | |
57 | * FIXME: Add locking | |
58 | */ | |
59 | int 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 | } | |
81 | EXPORT_SYMBOL(ocpi_enable); | |
82 | ||
83 | static 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 | ||
99 | static 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 | ||
110 | MODULE_AUTHOR("Tony Lindgren <tony@atomide.com>"); | |
111 | MODULE_DESCRIPTION("OMAP OCPI bus controller module"); | |
112 | MODULE_LICENSE("GPL"); | |
113 | module_init(omap_ocpi_init); | |
114 | module_exit(omap_ocpi_exit); |