xref: /openbmc/linux/arch/arm/mach-omap1/io.c (revision 9a99b142)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * linux/arch/arm/mach-omap1/io.c
4  *
5  * OMAP1 I/O mapping code
6  */
7 
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/init.h>
11 #include <linux/io.h>
12 #include <linux/omap-dma.h>
13 
14 #include <asm/tlb.h>
15 #include <asm/mach/map.h>
16 
17 #include "tc.h"
18 #include "iomap.h"
19 #include "common.h"
20 
21 /*
22  * The machine specific code may provide the extra mapping besides the
23  * default mapping provided here.
24  */
25 static struct map_desc omap1_io_desc[] __initdata = {
26 	{
27 		.virtual	= OMAP1_IO_VIRT,
28 		.pfn		= __phys_to_pfn(OMAP1_IO_PHYS),
29 		.length		= OMAP1_IO_SIZE,
30 		.type		= MT_DEVICE
31 	}, {
32 		.virtual	= OMAP1_DSP_BASE,
33 		.pfn		= __phys_to_pfn(OMAP1_DSP_START),
34 		.length		= OMAP1_DSP_SIZE,
35 		.type		= MT_DEVICE
36 	}, {
37 		.virtual	= OMAP1_DSPREG_BASE,
38 		.pfn		= __phys_to_pfn(OMAP1_DSPREG_START),
39 		.length		= OMAP1_DSPREG_SIZE,
40 		.type		= MT_DEVICE
41 	}
42 };
43 
44 /*
45  * Maps common IO regions for omap1
46  */
omap1_map_io(void)47 void __init omap1_map_io(void)
48 {
49 	iotable_init(omap1_io_desc, ARRAY_SIZE(omap1_io_desc));
50 }
51 
52 /*
53  * Common low-level hardware init for omap1.
54  */
omap1_init_early(void)55 void __init omap1_init_early(void)
56 {
57 	omap_check_revision();
58 
59 	/* REVISIT: Refer to OMAP5910 Errata, Advisory SYS_1: "Timeout Abort
60 	 * on a Posted Write in the TIPB Bridge".
61 	 */
62 	omap_writew(0x0, MPU_PUBLIC_TIPB_CNTL);
63 	omap_writew(0x0, MPU_PRIVATE_TIPB_CNTL);
64 }
65 
omap1_init_late(void)66 void __init omap1_init_late(void)
67 {
68 	omap_serial_wakeup_init();
69 }
70 
71 /*
72  * NOTE: Please use ioremap + __raw_read/write where possible instead of these
73  */
74 
omap_readb(u32 pa)75 u8 omap_readb(u32 pa)
76 {
77 	return __raw_readb(OMAP1_IO_ADDRESS(pa));
78 }
79 EXPORT_SYMBOL(omap_readb);
80 
omap_readw(u32 pa)81 u16 omap_readw(u32 pa)
82 {
83 	return __raw_readw(OMAP1_IO_ADDRESS(pa));
84 }
85 EXPORT_SYMBOL(omap_readw);
86 
omap_readl(u32 pa)87 u32 omap_readl(u32 pa)
88 {
89 	return __raw_readl(OMAP1_IO_ADDRESS(pa));
90 }
91 EXPORT_SYMBOL(omap_readl);
92 
omap_writeb(u8 v,u32 pa)93 void omap_writeb(u8 v, u32 pa)
94 {
95 	__raw_writeb(v, OMAP1_IO_ADDRESS(pa));
96 }
97 EXPORT_SYMBOL(omap_writeb);
98 
omap_writew(u16 v,u32 pa)99 void omap_writew(u16 v, u32 pa)
100 {
101 	__raw_writew(v, OMAP1_IO_ADDRESS(pa));
102 }
103 EXPORT_SYMBOL(omap_writew);
104 
omap_writel(u32 v,u32 pa)105 void omap_writel(u32 v, u32 pa)
106 {
107 	__raw_writel(v, OMAP1_IO_ADDRESS(pa));
108 }
109 EXPORT_SYMBOL(omap_writel);
110