diff options
author | Linus Torvalds <torvalds@g5.osdl.org> | 2005-07-10 15:57:49 -0400 |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-07-10 15:57:49 -0400 |
commit | 5c23804a0941a111752fdacefe0bea2db1b4d93f (patch) | |
tree | 482436cd247783c7df3d522fdc4ee51e2b3e87dc /arch/arm/plat-omap/ocpi.c | |
parent | 58c853c6eabe93ab5e5daf7150fbb4e562acbb79 (diff) | |
parent | ec6bced6c7b92904f5ead39c9c1b8dc734e6eff0 (diff) |
Merge master.kernel.org:~rmk/linux-2.6-arm.git
Diffstat (limited to 'arch/arm/plat-omap/ocpi.c')
-rw-r--r-- | arch/arm/plat-omap/ocpi.c | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/ocpi.c b/arch/arm/plat-omap/ocpi.c new file mode 100644 index 000000000000..1fb16f9edfd5 --- /dev/null +++ b/arch/arm/plat-omap/ocpi.c | |||
@@ -0,0 +1,114 @@ | |||
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/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); | ||