1 | /** |
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2 | * @file |
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3 | * |
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4 | * @ingroup raspberrypi_usart |
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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) 2015 Yang Qiao |
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11 | * based on work by: |
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12 | * Copyright (c) 2013 Alan Cudmore |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in the file LICENSE in this distribution or at |
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16 | * |
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17 | * http://www.rtems.org/license/LICENSE |
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18 | * |
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19 | */ |
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20 | |
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21 | #include <rtems/bspIo.h> |
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22 | #include <rtems/console.h> |
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23 | #include <rtems/sysinit.h> |
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24 | |
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25 | #include <libchip/serial.h> |
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26 | #include <libfdt.h> |
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27 | #include <libchip/ns16550.h> |
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28 | |
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29 | #include <bspopts.h> |
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30 | #include <bsp/usart.h> |
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31 | #include <bsp/raspberrypi.h> |
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32 | #include <bsp/fbcons.h> |
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33 | #include <bsp.h> |
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34 | #include <bsp/arm-pl011.h> |
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35 | #include <bsp/console-termios.h> |
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36 | #include <bsp/fdt.h> |
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37 | #include <bsp/fatal.h> |
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38 | #include <bsp/gpio.h> |
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39 | #include <bsp/rpi-gpio.h> |
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40 | |
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41 | /** |
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42 | * UART0 - PL011 |
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43 | * UART1 - Mini UART |
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44 | */ |
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45 | #define PL011 "/dev/ttyAMA0" |
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46 | #define MINIUART "/dev/ttyS0" |
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47 | #define FBCONS "/dev/fbcons" |
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48 | |
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49 | arm_pl011_context pl011_context; |
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50 | ns16550_context mini_uart_context; |
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51 | |
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52 | rpi_fb_context fb_context; |
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53 | |
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54 | static void output_char_pl011(char c) |
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55 | { |
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56 | arm_pl011_write_polled(&pl011_context.base, c); |
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57 | } |
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58 | |
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59 | static void output_char_mini_uart(char c) |
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60 | { |
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61 | ns16550_polled_putchar(&mini_uart_context.base, c); |
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62 | } |
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63 | |
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64 | void output_char_fb(char c) |
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65 | { |
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66 | fbcons_write_polled(&fb_context.base, c); |
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67 | } |
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68 | |
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69 | static uint8_t mini_uart_get_reg(uintptr_t port, uint8_t index) |
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70 | { |
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71 | volatile uint32_t *val = (volatile uint32_t *)port + index; |
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72 | return (uint8_t) *val; |
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73 | } |
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74 | |
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75 | static void mini_uart_set_reg(uintptr_t port, uint8_t index, uint8_t val) |
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76 | { |
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77 | volatile uint32_t *reg = (volatile uint32_t *)port + index; |
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78 | *reg = val; |
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79 | } |
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80 | |
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81 | static void init_ctx_arm_pl011( |
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82 | const void *fdt, |
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83 | int node |
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84 | ) |
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85 | { |
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86 | arm_pl011_context *ctx = &pl011_context; |
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87 | rtems_termios_device_context_initialize(&ctx->base, "PL011UART"); |
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88 | ctx->regs = raspberrypi_get_reg_of_node(fdt, node); |
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89 | } |
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90 | |
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91 | static uint32_t calculate_baud_divisor( |
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92 | ns16550_context *ctx, |
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93 | uint32_t baud |
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94 | ) |
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95 | { |
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96 | uint32_t baudDivisor = (ctx->clock / (8 * baud)) - 1; |
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97 | return baudDivisor; |
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98 | } |
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99 | |
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100 | static void init_ctx_mini_uart( |
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101 | const void *fdt, |
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102 | int node |
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103 | ) |
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104 | { |
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105 | const char *status; |
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106 | int len; |
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107 | ns16550_context *ctx; |
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108 | |
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109 | memset(&mini_uart_context, 0, sizeof(mini_uart_context)); |
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110 | ctx = &mini_uart_context; |
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111 | |
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112 | rtems_termios_device_context_initialize(&ctx->base, "MiniUART"); |
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113 | |
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114 | status = fdt_getprop(fdt, node, "status", &len); |
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115 | if ( status == NULL || strcmp(status, "disabled" ) == 0){ |
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116 | return ; |
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117 | } |
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118 | |
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119 | ctx->port = (uintptr_t) raspberrypi_get_reg_of_node(fdt, node); |
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120 | ctx->initial_baud = MINI_UART_DEFAULT_BAUD; |
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121 | ctx->clock = BCM2835_CLOCK_FREQ; |
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122 | ctx->calculate_baud_divisor = calculate_baud_divisor; |
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123 | ctx->get_reg = mini_uart_get_reg; |
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124 | ctx->set_reg = mini_uart_set_reg; |
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125 | |
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126 | rtems_gpio_bsp_select_specific_io(0, 14, RPI_ALT_FUNC_5, NULL); |
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127 | rtems_gpio_bsp_select_specific_io(0, 15, RPI_ALT_FUNC_5, NULL); |
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128 | rtems_gpio_bsp_set_resistor_mode(0, 14, NO_PULL_RESISTOR); |
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129 | rtems_gpio_bsp_set_resistor_mode(0, 15, NO_PULL_RESISTOR); |
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130 | |
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131 | BCM2835_REG(AUX_ENABLES) |= 0x1; |
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132 | ns16550_probe(&ctx->base); |
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133 | } |
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134 | |
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135 | static void register_fb( void ) |
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136 | { |
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137 | if (fbcons_probe(&fb_context.base) == true) { |
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138 | rtems_termios_device_install( |
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139 | FBCONS, |
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140 | &fbcons_fns, |
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141 | NULL, |
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142 | &fb_context.base); |
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143 | } |
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144 | } |
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145 | |
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146 | static void console_select( void ) |
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147 | { |
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148 | const char *opt; |
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149 | |
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150 | opt = rpi_cmdline_get_arg("--console="); |
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151 | |
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152 | if ( opt ) { |
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153 | if ( strncmp( opt, "fbcons", sizeof( "fbcons" ) - 1 ) == 0 ) { |
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154 | if ( rpi_video_is_initialized() > 0 ) { |
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155 | BSP_output_char = output_char_fb; |
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156 | link(FBCONS, CONSOLE_DEVICE_NAME); |
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157 | return ; |
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158 | } |
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159 | } else if ( strncmp( opt, MINIUART, sizeof(MINIUART) - 1 ) == 0) { |
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160 | BSP_output_char = output_char_mini_uart; |
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161 | link(MINIUART, CONSOLE_DEVICE_NAME); |
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162 | } else if ( strncmp( opt, PL011, sizeof(PL011) - 1 ) == 0) { |
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163 | BSP_output_char = output_char_pl011; |
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164 | link(PL011, CONSOLE_DEVICE_NAME); |
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165 | } |
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166 | }else { |
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167 | /** |
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168 | * If no command line option was given, default to PL011. |
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169 | */ |
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170 | BSP_output_char = output_char_pl011; |
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171 | link(PL011, CONSOLE_DEVICE_NAME); |
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172 | } |
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173 | } |
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174 | |
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175 | static void uart_probe(void) |
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176 | { |
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177 | static bool initialized = false; |
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178 | const void *fdt; |
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179 | const char *console; |
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180 | int len; |
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181 | int node; |
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182 | |
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183 | if ( initialized ) { |
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184 | return ; |
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185 | } |
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186 | |
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187 | fdt = bsp_fdt_get(); |
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188 | |
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189 | node = fdt_node_offset_by_compatible(fdt, -1, "brcm,bcm2835-pl011"); |
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190 | init_ctx_arm_pl011(fdt, node); |
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191 | |
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192 | node = fdt_node_offset_by_compatible(fdt, -1, "brcm,bcm2835-aux-uart"); |
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193 | init_ctx_mini_uart(fdt, node); |
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194 | |
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195 | node = fdt_path_offset(fdt, "/aliases"); |
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196 | console = fdt_getprop(fdt, node, "serial0", &len); |
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197 | |
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198 | if ( strcmp(console, "/soc/serial@7e215040" ) == 0) { |
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199 | BSP_output_char = output_char_mini_uart; |
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200 | }else { |
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201 | BSP_output_char = output_char_pl011; |
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202 | } |
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203 | |
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204 | initialized = true; |
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205 | } |
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206 | |
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207 | static void output_char(char c) |
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208 | { |
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209 | uart_probe(); |
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210 | (*BSP_output_char)(c); |
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211 | } |
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212 | |
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213 | rtems_status_code console_initialize( |
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214 | rtems_device_major_number major, |
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215 | rtems_device_minor_number minor, |
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216 | void *arg |
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217 | ) |
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218 | { |
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219 | rtems_termios_initialize(); |
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220 | |
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221 | uart_probe(); |
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222 | rtems_termios_device_install( |
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223 | PL011, |
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224 | &arm_pl011_fns, |
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225 | NULL, |
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226 | &pl011_context.base |
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227 | ); |
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228 | |
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229 | rtems_termios_device_install( |
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230 | MINIUART, |
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231 | &ns16550_handler_polled, |
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232 | NULL, |
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233 | &mini_uart_context.base |
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234 | ); |
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235 | |
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236 | register_fb(); |
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237 | |
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238 | console_select(); |
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239 | |
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240 | return RTEMS_SUCCESSFUL; |
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241 | } |
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242 | |
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243 | BSP_output_char_function_type BSP_output_char = output_char; |
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244 | |
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245 | BSP_polling_getchar_function_type BSP_poll_char = NULL; |
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246 | |
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247 | RTEMS_SYSINIT_ITEM( |
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248 | uart_probe, |
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249 | RTEMS_SYSINIT_BSP_START, |
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250 | RTEMS_SYSINIT_ORDER_LAST_BUT_5 |
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251 | ); |
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