xref: /openbmc/linux/arch/arm/mach-omap1/io.c (revision b6dcefde)
1 /*
2  * linux/arch/arm/mach-omap1/io.c
3  *
4  * OMAP1 I/O mapping code
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License version 2 as
8  * published by the Free Software Foundation.
9  */
10 
11 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/io.h>
15 
16 #include <asm/tlb.h>
17 #include <asm/mach/map.h>
18 #include <plat/mux.h>
19 #include <plat/tc.h>
20 
21 #include "clock.h"
22 
23 extern void omap_check_revision(void);
24 extern void omap_sram_init(void);
25 extern void omapfb_reserve_sdram(void);
26 
27 /*
28  * The machine specific code may provide the extra mapping besides the
29  * default mapping provided here.
30  */
31 static struct map_desc omap_io_desc[] __initdata = {
32 	{
33 		.virtual	= OMAP1_IO_VIRT,
34 		.pfn		= __phys_to_pfn(OMAP1_IO_PHYS),
35 		.length		= OMAP1_IO_SIZE,
36 		.type		= MT_DEVICE
37 	}
38 };
39 
40 #if defined (CONFIG_ARCH_OMAP730) || defined (CONFIG_ARCH_OMAP850)
41 static struct map_desc omap7xx_io_desc[] __initdata = {
42 	{
43 		.virtual	= OMAP7XX_DSP_BASE,
44 		.pfn		= __phys_to_pfn(OMAP7XX_DSP_START),
45 		.length		= OMAP7XX_DSP_SIZE,
46 		.type		= MT_DEVICE
47 	}, {
48 		.virtual	= OMAP7XX_DSPREG_BASE,
49 		.pfn		= __phys_to_pfn(OMAP7XX_DSPREG_START),
50 		.length		= OMAP7XX_DSPREG_SIZE,
51 		.type		= MT_DEVICE
52 	}
53 };
54 #endif
55 
56 #ifdef CONFIG_ARCH_OMAP15XX
57 static struct map_desc omap1510_io_desc[] __initdata = {
58 	{
59 		.virtual	= OMAP1510_DSP_BASE,
60 		.pfn		= __phys_to_pfn(OMAP1510_DSP_START),
61 		.length		= OMAP1510_DSP_SIZE,
62 		.type		= MT_DEVICE
63 	}, {
64 		.virtual	= OMAP1510_DSPREG_BASE,
65 		.pfn		= __phys_to_pfn(OMAP1510_DSPREG_START),
66 		.length		= OMAP1510_DSPREG_SIZE,
67 		.type		= MT_DEVICE
68 	}
69 };
70 #endif
71 
72 #if defined(CONFIG_ARCH_OMAP16XX)
73 static struct map_desc omap16xx_io_desc[] __initdata = {
74 	{
75 		.virtual	= OMAP16XX_DSP_BASE,
76 		.pfn		= __phys_to_pfn(OMAP16XX_DSP_START),
77 		.length		= OMAP16XX_DSP_SIZE,
78 		.type		= MT_DEVICE
79 	}, {
80 		.virtual	= OMAP16XX_DSPREG_BASE,
81 		.pfn		= __phys_to_pfn(OMAP16XX_DSPREG_START),
82 		.length		= OMAP16XX_DSPREG_SIZE,
83 		.type		= MT_DEVICE
84 	}
85 };
86 #endif
87 
88 /*
89  * Maps common IO regions for omap1. This should only get called from
90  * board specific init.
91  */
92 void __init omap1_map_common_io(void)
93 {
94 	iotable_init(omap_io_desc, ARRAY_SIZE(omap_io_desc));
95 
96 	/* Normally devicemaps_init() would flush caches and tlb after
97 	 * mdesc->map_io(), but we must also do it here because of the CPU
98 	 * revision check below.
99 	 */
100 	local_flush_tlb_all();
101 	flush_cache_all();
102 
103 	/* We want to check CPU revision early for cpu_is_omapxxxx() macros.
104 	 * IO space mapping must be initialized before we can do that.
105 	 */
106 	omap_check_revision();
107 
108 #if defined (CONFIG_ARCH_OMAP730) || defined (CONFIG_ARCH_OMAP850)
109 	if (cpu_is_omap7xx()) {
110 		iotable_init(omap7xx_io_desc, ARRAY_SIZE(omap7xx_io_desc));
111 	}
112 #endif
113 #ifdef CONFIG_ARCH_OMAP15XX
114 	if (cpu_is_omap15xx()) {
115 		iotable_init(omap1510_io_desc, ARRAY_SIZE(omap1510_io_desc));
116 	}
117 #endif
118 #if defined(CONFIG_ARCH_OMAP16XX)
119 	if (cpu_is_omap16xx()) {
120 		iotable_init(omap16xx_io_desc, ARRAY_SIZE(omap16xx_io_desc));
121 	}
122 #endif
123 
124 	omap_sram_init();
125 	omapfb_reserve_sdram();
126 }
127 
128 /*
129  * Common low-level hardware init for omap1. This should only get called from
130  * board specific init.
131  */
132 void __init omap1_init_common_hw(void)
133 {
134 	/* REVISIT: Refer to OMAP5910 Errata, Advisory SYS_1: "Timeout Abort
135 	 * on a Posted Write in the TIPB Bridge".
136 	 */
137 	omap_writew(0x0, MPU_PUBLIC_TIPB_CNTL);
138 	omap_writew(0x0, MPU_PRIVATE_TIPB_CNTL);
139 
140 	/* Must init clocks early to assure that timer interrupt works
141 	 */
142 	omap1_clk_init();
143 
144 	omap1_mux_init();
145 }
146 
147