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 u32 *uart;
29
30 /* PORT_16C550A, in polled non-fifo mode */
putc(char c)31 static void putc(char c)
32 {
33 while (!(uart[UART_LSR] & UART_LSR_THRE))
34 barrier();
35 uart[UART_TX] = c;
36 }
37
flush(void)38 static inline void flush(void)
39 {
40 while (!(uart[UART_LSR] & UART_LSR_THRE))
41 barrier();
42 }
43
set_uart_info(u32 phys,void * __iomem virt)44 static inline void set_uart_info(u32 phys, void * __iomem virt)
45 {
46 /*
47 * Get address of some.bss variable and round it down
48 * a la CONFIG_AUTO_ZRELADDR.
49 */
50 u32 ram_start = (u32)&uart & 0xf8000000;
51 u32 *uart_info = (u32 *)(ram_start + DAVINCI_UART_INFO_OFS);
52
53 uart = (u32 *)phys;
54 uart_info[0] = phys;
55 uart_info[1] = (u32)virt;
56 }
57
58 #define _DEBUG_LL_ENTRY(machine, phys, virt) \
59 if (machine_is_##machine()) { \
60 set_uart_info(phys, virt); \
61 break; \
62 }
63
64 #define DEBUG_LL_DAVINCI(machine, port) \
65 _DEBUG_LL_ENTRY(machine, DAVINCI_UART##port##_BASE, \
66 IO_ADDRESS(DAVINCI_UART##port##_BASE))
67
68 #define DEBUG_LL_DA8XX(machine, port) \
69 _DEBUG_LL_ENTRY(machine, DA8XX_UART##port##_BASE, \
70 IO_ADDRESS(DA8XX_UART##port##_BASE))
71
72 #define DEBUG_LL_TNETV107X(machine, port) \
73 _DEBUG_LL_ENTRY(machine, TNETV107X_UART##port##_BASE, \
74 TNETV107X_UART##port##_VIRT)
75
__arch_decomp_setup(unsigned long arch_id)76 static inline void __arch_decomp_setup(unsigned long arch_id)
77 {
78 /*
79 * Initialize the port based on the machine ID from the bootloader.
80 * Note that we're using macros here instead of switch statement
81 * as machine_is functions are optimized out for the boards that
82 * are not selected.
83 */
84 do {
85 /* Davinci boards */
86 DEBUG_LL_DAVINCI(davinci_evm, 0);
87 DEBUG_LL_DAVINCI(sffsdr, 0);
88 DEBUG_LL_DAVINCI(neuros_osd2, 0);
89 DEBUG_LL_DAVINCI(davinci_dm355_evm, 0);
90 DEBUG_LL_DAVINCI(dm355_leopard, 0);
91 DEBUG_LL_DAVINCI(davinci_dm6467_evm, 0);
92 DEBUG_LL_DAVINCI(davinci_dm365_evm, 0);
93
94 /* DA8xx boards */
95 DEBUG_LL_DA8XX(davinci_da830_evm, 2);
96 DEBUG_LL_DA8XX(davinci_da850_evm, 2);
97 DEBUG_LL_DA8XX(mityomapl138, 1);
98 DEBUG_LL_DA8XX(omapl138_hawkboard, 2);
99
100 /* TNETV107x boards */
101 DEBUG_LL_TNETV107X(tnetv107x, 1);
102 } while (0);
103 }
104
105 #define arch_decomp_setup() __arch_decomp_setup(arch_id)
106 #define arch_decomp_wdog()
107