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 */
putc(char c)33 static void putc(char c)
34 {
35 while (!(uart[UART_LSR] & UART_LSR_THRE))
36 barrier();
37 uart[UART_TX] = c;
38 }
39
flush(void)40 static inline void flush(void)
41 {
42 while (!(uart[UART_LSR] & UART_LSR_THRE))
43 barrier();
44 }
45
set_uart_info(u32 phys,void * __iomem virt)46 static inline void set_uart_info(u32 phys, void * __iomem virt)
47 {
48 /*
49 * Get address of some.bss variable and round it down
50 * a la CONFIG_AUTO_ZRELADDR.
51 */
52 u32 ram_start = (u32)&uart & 0xf8000000;
53 u32 *uart_info = (u32 *)(ram_start + DAVINCI_UART_INFO_OFS);
54
55 uart = (u32 *)phys;
56 uart_info[0] = phys;
57 uart_info[1] = (u32)virt;
58 }
59
60 #define _DEBUG_LL_ENTRY(machine, phys, virt) \
61 if (machine_is_##machine()) { \
62 set_uart_info(phys, virt); \
63 break; \
64 }
65
66 #define DEBUG_LL_DAVINCI(machine, port) \
67 _DEBUG_LL_ENTRY(machine, DAVINCI_UART##port##_BASE, \
68 IO_ADDRESS(DAVINCI_UART##port##_BASE))
69
70 #define DEBUG_LL_DA8XX(machine, port) \
71 _DEBUG_LL_ENTRY(machine, DA8XX_UART##port##_BASE, \
72 IO_ADDRESS(DA8XX_UART##port##_BASE))
73
74 #define DEBUG_LL_TNETV107X(machine, port) \
75 _DEBUG_LL_ENTRY(machine, TNETV107X_UART##port##_BASE, \
76 TNETV107X_UART##port##_VIRT)
77
__arch_decomp_setup(unsigned long arch_id)78 static inline void __arch_decomp_setup(unsigned long arch_id)
79 {
80 /*
81 * Initialize the port based on the machine ID from the bootloader.
82 * Note that we're using macros here instead of switch statement
83 * as machine_is functions are optimized out for the boards that
84 * are not selected.
85 */
86 do {
87 /* Davinci boards */
88 DEBUG_LL_DAVINCI(davinci_evm, 0);
89 DEBUG_LL_DAVINCI(sffsdr, 0);
90 DEBUG_LL_DAVINCI(neuros_osd2, 0);
91 DEBUG_LL_DAVINCI(davinci_dm355_evm, 0);
92 DEBUG_LL_DAVINCI(dm355_leopard, 0);
93 DEBUG_LL_DAVINCI(davinci_dm6467_evm, 0);
94 DEBUG_LL_DAVINCI(davinci_dm365_evm, 0);
95
96 /* DA8xx boards */
97 DEBUG_LL_DA8XX(davinci_da830_evm, 2);
98 DEBUG_LL_DA8XX(davinci_da850_evm, 2);
99 DEBUG_LL_DA8XX(mityomapl138, 1);
100 DEBUG_LL_DA8XX(omapl138_hawkboard, 2);
101
102 /* TNETV107x boards */
103 DEBUG_LL_TNETV107X(tnetv107x, 1);
104 } while (0);
105 }
106
107 #define arch_decomp_setup() __arch_decomp_setup(arch_id)
108 #define arch_decomp_wdog()
109