1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup arm_beagle |
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5 | * |
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6 | * @brief Console configuration. |
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7 | */ |
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8 | |
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9 | /* |
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10 | * Copyright (c) 2012 Claas Ziemke. All rights reserved. |
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11 | * |
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12 | * Claas Ziemke |
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13 | * Kernerstrasse 11 |
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14 | * 70182 Stuttgart |
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15 | * Germany |
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16 | * <claas.ziemke@gmx.net> |
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17 | * |
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18 | * The license and distribution terms for this file may be |
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19 | * found in the file LICENSE in this distribution or at |
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20 | * http://www.rtems.org/license/LICENSE. |
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21 | * |
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22 | * Modified by Ben Gras <beng@shrike-systems.com> to make |
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23 | * interrupt-driven uart i/o work for beagleboards; beaglebone support added. |
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24 | */ |
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25 | |
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26 | #include <libchip/serial.h> |
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27 | #include <libchip/ns16550.h> |
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28 | |
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29 | #include <rtems/bspIo.h> |
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30 | |
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31 | #include <bsp.h> |
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32 | #include <bsp/irq.h> |
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33 | #include <bsp/uart-output-char.h> |
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34 | |
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35 | #define CONSOLE_UART_THR (*(volatile unsigned int *)BSP_CONSOLE_UART_BASE) |
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36 | #define CONSOLE_UART_RHR (*(volatile unsigned int *)BSP_CONSOLE_UART_BASE) |
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37 | #define CONSOLE_UART_LSR (*(volatile unsigned int *)(BSP_CONSOLE_UART_BASE+0x14)) |
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38 | #define CONSOLE_SYSC (*(volatile uint32_t *) (BSP_CONSOLE_UART_BASE + 0x54)) |
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39 | #define CONSOLE_SYSS (*(volatile uint32_t *) (BSP_CONSOLE_UART_BASE + 0x58)) |
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40 | |
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41 | #define TX_FIFO_E (1<<5) |
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42 | #define RX_FIFO_E (1<<0) |
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43 | |
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44 | static uint8_t beagle_uart_get_register(uintptr_t addr, uint8_t i) |
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45 | { |
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46 | uint8_t v; |
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47 | volatile uint32_t *reg_r = (volatile uint32_t *) addr + i; |
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48 | |
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49 | if(reg_r == (uint32_t*) BSP_CONSOLE_UART_BASE /* reading RHR */ ) { |
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50 | /* check there should be anything in the RHR before accessing it */ |
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51 | if(!(CONSOLE_UART_LSR & 0x01)) { |
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52 | return 0; |
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53 | } |
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54 | } |
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55 | |
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56 | v = (uint8_t) *reg_r; |
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57 | |
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58 | return v; |
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59 | } |
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60 | |
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61 | static void beagle_uart_set_register(uintptr_t addr, uint8_t i, uint8_t val) |
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62 | { |
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63 | volatile uint32_t *reg = (volatile uint32_t *) addr; |
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64 | |
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65 | reg [i] = val; |
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66 | } |
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67 | |
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68 | console_tbl Console_Configuration_Ports [] = { |
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69 | { |
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70 | .sDeviceName = "/dev/ttyS0", |
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71 | .deviceType = SERIAL_NS16550, |
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72 | #if CONSOLE_POLLED /* option to facilitate running the tests */ |
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73 | .pDeviceFns = &ns16550_fns_polled, |
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74 | #else |
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75 | .pDeviceFns = &ns16550_fns, |
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76 | #endif |
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77 | .ulMargin = 16, |
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78 | .ulHysteresis = 8, |
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79 | .pDeviceParams = (void *) CONSOLE_BAUD, |
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80 | .ulCtrlPort1 = BSP_CONSOLE_UART_BASE, |
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81 | .ulDataPort = BSP_CONSOLE_UART_BASE, |
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82 | .ulIntVector = BSP_CONSOLE_UART_IRQ, |
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83 | .getRegister = beagle_uart_get_register, |
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84 | .setRegister = beagle_uart_set_register, |
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85 | .ulClock = UART_CLOCK, /* 48MHz base clock */ |
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86 | }, |
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87 | }; |
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88 | |
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89 | unsigned long Console_Configuration_Count = 1; |
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90 | |
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91 | static int init_needed = 1; // don't rely on bss being 0 |
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92 | |
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93 | static void beagle_console_init(void) |
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94 | { |
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95 | if(init_needed) { |
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96 | const uint32_t div = UART_CLOCK / 16 / CONSOLE_BAUD; |
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97 | CONSOLE_SYSC = 2; |
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98 | while ((CONSOLE_SYSS & 1) == 0) |
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99 | ; |
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100 | if ((CONSOLE_LSR & (CONSOLE_LSR_THRE | CONSOLE_LSR_TEMT)) == CONSOLE_LSR_THRE) { |
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101 | CONSOLE_LCR = 0x83; |
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102 | CONSOLE_DLL = div; |
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103 | CONSOLE_DLM = (div >> 8) & 0xff; |
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104 | CONSOLE_LCR = 0x03; |
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105 | CONSOLE_ACR = 0x00; |
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106 | } |
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107 | |
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108 | while ((CONSOLE_LSR & CONSOLE_LSR_TEMT) == 0) |
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109 | ; |
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110 | |
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111 | CONSOLE_LCR = 0x80 | 0x03; |
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112 | CONSOLE_DLL = 0x00; |
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113 | CONSOLE_DLM = 0x00; |
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114 | CONSOLE_LCR = 0x03; |
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115 | CONSOLE_MCR = 0x03; |
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116 | CONSOLE_FCR = 0x07; |
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117 | CONSOLE_LCR = 0x83; |
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118 | CONSOLE_DLL = div; |
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119 | CONSOLE_DLM = (div >> 8) & 0xff; |
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120 | CONSOLE_LCR = 0x03; |
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121 | CONSOLE_ACR = 0x00; |
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122 | init_needed = 0; |
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123 | } |
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124 | } |
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125 | |
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126 | #define CONSOLE_THR8 (*(volatile uint8_t *) (BSP_CONSOLE_UART_BASE + 0x00)) |
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127 | |
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128 | static void uart_write_polled( char c ) |
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129 | { |
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130 | if(init_needed) beagle_console_init(); |
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131 | |
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132 | while( ( CONSOLE_LSR & TX_FIFO_E ) == 0 ) |
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133 | ; |
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134 | CONSOLE_THR8 = c; |
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135 | } |
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136 | |
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137 | static void _BSP_put_char( char c ) { |
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138 | uart_write_polled( c ); |
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139 | } |
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140 | |
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141 | static int _BSP_get_char(void) |
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142 | { |
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143 | if ((CONSOLE_LSR & CONSOLE_LSR_RDR) != 0) { |
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144 | return CONSOLE_RBR; |
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145 | } else { |
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146 | return -1; |
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147 | } |
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148 | } |
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149 | |
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150 | BSP_output_char_function_type BSP_output_char = _BSP_put_char; |
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151 | |
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152 | BSP_polling_getchar_function_type BSP_poll_char = _BSP_get_char; |
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