1 /*
2 * Serial port stubs for kernel decompress status messages
3 *
4 * Initially based on:
5 * arch/arm/plat-omap/include/mach/uncompress.h
6 *
7 * Original copyrights follow.
8 *
9 * Copyright (C) 2000 RidgeRun, Inc.
10 * Author: Greg Lonnon <glonnon@ridgerun.com>
11 *
12 * Rewritten by:
13 * Author: <source@mvista.com>
14 * 2004 (c) MontaVista Software, Inc.
15 *
16 * This file is licensed under the terms of the GNU General Public License
17 * version 2. This program is licensed "as is" without any warranty of any
18 * kind, whether express or implied.
19 */
20
21 #include <linux/types.h>
22 #include <linux/serial_reg.h>
23
24 #include <asm/mach-types.h>
25
26 #include <mach/serial.h>
27
28 #define IOMEM(x) ((void __force __iomem *)(x))
29
30 u32 *uart;
31
32 /* PORT_16C550A, in polled non-fifo mode */
33 static inline void putc(char c)
34 {
35 if (!uart)
36 return;
37
38 while (!(uart[UART_LSR] & UART_LSR_THRE))
39 barrier();
40 uart[UART_TX] = c;
41 }
42
43 static inline void flush(void)
44 {
45 if (!uart)
46 return;
47
48 while (!(uart[UART_LSR] & UART_LSR_THRE))
49 barrier();
50 }
51
52 static inline void set_uart_info(u32 phys)
53 {
54 uart = (u32 *)phys;
55 }
56
57 #define _DEBUG_LL_ENTRY(machine, phys) \
58 { \
59 if (machine_is_##machine()) { \
60 set_uart_info(phys); \
61 break; \
62 } \
63 }
64
65 #define DEBUG_LL_DAVINCI(machine, port) \
66 _DEBUG_LL_ENTRY(machine, DAVINCI_UART##port##_BASE)
67
68 #define DEBUG_LL_DA8XX(machine, port) \
69 _DEBUG_LL_ENTRY(machine, DA8XX_UART##port##_BASE)
70
71 static inline void __arch_decomp_setup(unsigned long arch_id)
72 {
73 /*
74 * Initialize the port based on the machine ID from the bootloader.
75 * Note that we're using macros here instead of switch statement
76 * as machine_is functions are optimized out for the boards that
77 * are not selected.
78 */
79 do {
80 /* Davinci boards */
81 DEBUG_LL_DAVINCI(davinci_evm, 0);
82 DEBUG_LL_DAVINCI(sffsdr, 0);
83 DEBUG_LL_DAVINCI(neuros_osd2, 0);
84 DEBUG_LL_DAVINCI(davinci_dm355_evm, 0);
85 DEBUG_LL_DAVINCI(dm355_leopard, 0);
86 DEBUG_LL_DAVINCI(davinci_dm6467_evm, 0);
87 DEBUG_LL_DAVINCI(davinci_dm365_evm, 0);
88
89 /* DA8xx boards */
90 DEBUG_LL_DA8XX(davinci_da830_evm, 2);
91 DEBUG_LL_DA8XX(davinci_da850_evm, 2);
92 DEBUG_LL_DA8XX(mityomapl138, 1);
93 DEBUG_LL_DA8XX(omapl138_hawkboard, 2);
94 } while (0);
95 }
96
97 #define arch_decomp_setup() __arch_decomp_setup(arch_id)