tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
1/*
2 * linux/include/asm-arm/arch-omap/io.h
3 *
4 * IO definitions for TI OMAP processors and boards
5 *
6 * Copied from linux/include/asm-arm/arch-sa1100/io.h
7 * Copyright (C) 1997-1999 Russell King
8 *
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2 of the License, or (at your
12 * option) any later version.
13 *
14 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
15 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
16 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
17 * NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
20 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
21 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 *
25 * You should have received a copy of the GNU General Public License along
26 * with this program; if not, write to the Free Software Foundation, Inc.,
27 * 675 Mass Ave, Cambridge, MA 02139, USA.
28 *
29 * Modifications:
30 * 06-12-1997 RMK Created.
31 * 07-04-1999 RMK Major cleanup
32 */
33
34#ifndef __ASM_ARM_ARCH_IO_H
35#define __ASM_ARM_ARCH_IO_H
36
37#define IO_SPACE_LIMIT 0xffffffff
38
39/*
40 * We don't actually have real ISA nor PCI buses, but there is so many
41 * drivers out there that might just work if we fake them...
42 */
43#define __io(a) ((void __iomem *)(PCIO_BASE + (a)))
44#define __mem_pci(a) (a)
45#define __mem_isa(a) (a)
46
47/*
48 * ----------------------------------------------------------------------------
49 * I/O mapping
50 * ----------------------------------------------------------------------------
51 */
52
53#if defined(CONFIG_ARCH_OMAP1)
54#define IO_PHYS 0xFFFB0000
55#define IO_OFFSET -0x01000000 /* Virtual IO = 0xfefb0000 */
56#define IO_SIZE 0x40000
57
58#elif defined(CONFIG_ARCH_OMAP2)
59#define IO_PHYS 0x48000000 /* L4 peripherals; other stuff has to be mapped *
60 * manually. */
61#define IO_OFFSET 0x90000000 /* Virtual IO = 0xd8000000 */
62#define IO_SIZE 0x08000000
63#endif
64
65#define IO_VIRT (IO_PHYS + IO_OFFSET)
66#define IO_ADDRESS(x) ((x) + IO_OFFSET)
67#define PCIO_BASE 0
68#define io_p2v(x) ((x) + IO_OFFSET)
69#define io_v2p(x) ((x) - IO_OFFSET)
70
71#ifndef __ASSEMBLER__
72
73/*
74 * Functions to access the OMAP IO region
75 *
76 * NOTE: - Use omap_read/write[bwl] for physical register addresses
77 * - Use __raw_read/write[bwl]() for virtual register addresses
78 * - Use IO_ADDRESS(phys_addr) to convert registers to virtual addresses
79 * - DO NOT use hardcoded virtual addresses to allow changing the
80 * IO address space again if needed
81 */
82#define omap_readb(a) (*(volatile unsigned char *)IO_ADDRESS(a))
83#define omap_readw(a) (*(volatile unsigned short *)IO_ADDRESS(a))
84#define omap_readl(a) (*(volatile unsigned int *)IO_ADDRESS(a))
85
86#define omap_writeb(v,a) (*(volatile unsigned char *)IO_ADDRESS(a) = (v))
87#define omap_writew(v,a) (*(volatile unsigned short *)IO_ADDRESS(a) = (v))
88#define omap_writel(v,a) (*(volatile unsigned int *)IO_ADDRESS(a) = (v))
89
90/* 16 bit uses LDRH/STRH, base +/- offset_8 */
91typedef struct { volatile u16 offset[256]; } __regbase16;
92#define __REGV16(vaddr) ((__regbase16 *)((vaddr)&~0xff)) \
93 ->offset[((vaddr)&0xff)>>1]
94#define __REG16(paddr) __REGV16(io_p2v(paddr))
95
96/* 8/32 bit uses LDR/STR, base +/- offset_12 */
97typedef struct { volatile u8 offset[4096]; } __regbase8;
98#define __REGV8(vaddr) ((__regbase8 *)((vaddr)&~4095)) \
99 ->offset[((vaddr)&4095)>>0]
100#define __REG8(paddr) __REGV8(io_p2v(paddr))
101
102typedef struct { volatile u32 offset[4096]; } __regbase32;
103#define __REGV32(vaddr) ((__regbase32 *)((vaddr)&~4095)) \
104 ->offset[((vaddr)&4095)>>2]
105#define __REG32(paddr) __REGV32(io_p2v(paddr))
106
107extern void omap_map_common_io(void);
108
109#else
110
111#define __REG8(paddr) io_p2v(paddr)
112#define __REG16(paddr) io_p2v(paddr)
113#define __REG32(paddr) io_p2v(paddr)
114
115#endif
116
117#endif