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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 18:20:36 -0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/asm-arm/arch-s3c2410/uncompress.h
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/asm-arm/arch-s3c2410/uncompress.h')
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1 files changed, 158 insertions, 0 deletions
diff --git a/include/asm-arm/arch-s3c2410/uncompress.h b/include/asm-arm/arch-s3c2410/uncompress.h
new file mode 100644
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1/* linux/include/asm-arm/arch-s3c2410/uncompress.h
2 *
3 * (c) 2003 Simtec Electronics
4 * Ben Dooks <ben@simtec.co.uk>
5 *
6 * S3C2410 - uncompress code
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 *
12 * Changelog:
13 * 22-May-2003 BJD Created
14 * 08-Sep-2003 BJD Moved to linux v2.6
15 * 12-Mar-2004 BJD Updated header protection
16 * 12-Oct-2004 BJD Take account of debug uart configuration
17 * 15-Nov-2004 BJD Fixed uart configuration
18 * 22-Feb-2005 BJD Added watchdog to uncompress
19*/
20
21#ifndef __ASM_ARCH_UNCOMPRESS_H
22#define __ASM_ARCH_UNCOMPRESS_H
23
24#include <linux/config.h>
25
26/* defines for UART registers */
27#include "asm/arch/regs-serial.h"
28#include "asm/arch/regs-gpio.h"
29#include "asm/arch/regs-watchdog.h"
30
31#include <asm/arch/map.h>
32
33/* working in physical space... */
34#undef S3C2410_GPIOREG
35#undef S3C2410_WDOGREG
36
37#define S3C2410_GPIOREG(x) ((S3C2410_PA_GPIO + (x)))
38#define S3C2410_WDOGREG(x) ((S3C2410_PA_WATCHDOG + (x)))
39
40/* how many bytes we allow into the FIFO at a time in FIFO mode */
41#define FIFO_MAX (14)
42
43#define uart_base S3C2410_PA_UART + (0x4000*CONFIG_S3C2410_LOWLEVEL_UART_PORT)
44
45static __inline__ void
46uart_wr(unsigned int reg, unsigned int val)
47{
48 volatile unsigned int *ptr;
49
50 ptr = (volatile unsigned int *)(reg + uart_base);
51 *ptr = val;
52}
53
54static __inline__ unsigned int
55uart_rd(unsigned int reg)
56{
57 volatile unsigned int *ptr;
58
59 ptr = (volatile unsigned int *)(reg + uart_base);
60 return *ptr;
61}
62
63
64/* we can deal with the case the UARTs are being run
65 * in FIFO mode, so that we don't hold up our execution
66 * waiting for tx to happen...
67*/
68
69static void
70putc(char ch)
71{
72 int cpuid = *((volatile unsigned int *)S3C2410_GSTATUS1);
73
74 cpuid &= S3C2410_GSTATUS1_IDMASK;
75
76 if (ch == '\n')
77 putc('\r'); /* expand newline to \r\n */
78
79 if (uart_rd(S3C2410_UFCON) & S3C2410_UFCON_FIFOMODE) {
80 int level;
81
82 while (1) {
83 level = uart_rd(S3C2410_UFSTAT);
84
85 if (cpuid == S3C2410_GSTATUS1_2440) {
86 level &= S3C2440_UFSTAT_TXMASK;
87 level >>= S3C2440_UFSTAT_TXSHIFT;
88 } else {
89 level &= S3C2410_UFSTAT_TXMASK;
90 level >>= S3C2410_UFSTAT_TXSHIFT;
91 }
92
93 if (level < FIFO_MAX)
94 break;
95 }
96
97 } else {
98 /* not using fifos */
99
100 while ((uart_rd(S3C2410_UTRSTAT) & S3C2410_UTRSTAT_TXE) != S3C2410_UTRSTAT_TXE);
101 }
102
103 /* write byte to transmission register */
104 uart_wr(S3C2410_UTXH, ch);
105}
106
107static void
108putstr(const char *ptr)
109{
110 for (; *ptr != '\0'; ptr++) {
111 putc(*ptr);
112 }
113}
114
115/* CONFIG_S3C2410_BOOT_WATCHDOG
116 *
117 * Simple boot-time watchdog setup, to reboot the system if there is
118 * any problem with the boot process
119*/
120
121#ifdef CONFIG_S3C2410_BOOT_WATCHDOG
122
123#define WDOG_COUNT (0xff00)
124
125#define __raw_writel(d,ad) do { *((volatile unsigned int *)(ad)) = (d); } while(0)
126
127static inline void arch_decomp_wdog(void)
128{
129 __raw_writel(WDOG_COUNT, S3C2410_WTCNT);
130}
131
132static void arch_decomp_wdog_start(void)
133{
134 __raw_writel(WDOG_COUNT, S3C2410_WTDAT);
135 __raw_writel(WDOG_COUNT, S3C2410_WTCNT);
136 __raw_writel(S3C2410_WTCON_ENABLE | S3C2410_WTCON_DIV128 | S3C2410_WTCON_RSTEN | S3C2410_WTCON_PRESCALE(0x40), S3C2410_WTCON);
137}
138
139#else
140#define arch_decomp_wdog_start()
141#define arch_decomp_wdog()
142#endif
143
144static void error(char *err);
145
146static void
147arch_decomp_setup(void)
148{
149 /* we may need to setup the uart(s) here if we are not running
150 * on an BAST... the BAST will have left the uarts configured
151 * after calling linux.
152 */
153
154 arch_decomp_wdog_start();
155}
156
157
158#endif /* __ASM_ARCH_UNCOMPRESS_H */