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