[98eb7e78] | 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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[c32b1ef] | 9 | /* |
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[6b5df95] | 10 | * Copyright (c) 2015 Yang Qiao |
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| 11 | * based on work by: |
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[c32b1ef] | 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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[c499856] | 17 | * http://www.rtems.org/license/LICENSE |
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[c32b1ef] | 18 | * |
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| 19 | */ |
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| 20 | |
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| 21 | #include <rtems/bspIo.h> |
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[362cf319] | 22 | #include <rtems/console.h> |
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| 23 | #include <rtems/sysinit.h> |
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[c32b1ef] | 24 | |
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| 25 | #include <libchip/serial.h> |
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[362cf319] | 26 | #include <libfdt.h> |
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[f53473f] | 27 | #include <libchip/ns16550.h> |
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[c32b1ef] | 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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[6b5df95] | 32 | #include <bsp/fbcons.h> |
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[362cf319] | 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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[f53473f] | 38 | #include <bsp/gpio.h> |
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| 39 | #include <bsp/rpi-gpio.h> |
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[c32b1ef] | 40 | |
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[f53473f] | 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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[362cf319] | 47 | #define FBCONS "/dev/fbcons" |
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| 48 | |
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| 49 | arm_pl011_context pl011_context; |
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[f53473f] | 50 | ns16550_context mini_uart_context; |
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[362cf319] | 51 | |
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| 52 | rpi_fb_context fb_context; |
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| 53 | |
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[f53473f] | 54 | static void output_char_pl011(char c) |
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[362cf319] | 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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[f53473f] | 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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[362cf319] | 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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[f53473f] | 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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[362cf319] | 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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[f53473f] | 87 | rtems_termios_device_context_initialize(&ctx->base, "PL011UART"); |
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[362cf319] | 88 | ctx->regs = raspberrypi_get_reg_of_node(fdt, node); |
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| 89 | } |
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| 90 | |
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[f53473f] | 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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[362cf319] | 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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[f53473f] | 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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[362cf319] | 165 | } |
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[f53473f] | 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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[362cf319] | 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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[f53473f] | 179 | const char *console; |
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| 180 | int len; |
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[362cf319] | 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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[f53473f] | 189 | node = fdt_node_offset_by_compatible(fdt, -1, "brcm,bcm2835-pl011"); |
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[362cf319] | 190 | init_ctx_arm_pl011(fdt, node); |
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| 191 | |
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[f53473f] | 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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[362cf319] | 204 | initialized = true; |
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| 205 | } |
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[c32b1ef] | 206 | |
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| 207 | static void output_char(char c) |
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| 208 | { |
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[362cf319] | 209 | uart_probe(); |
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[f53473f] | 210 | (*BSP_output_char)(c); |
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[362cf319] | 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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[c32b1ef] | 220 | |
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[362cf319] | 221 | uart_probe(); |
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| 222 | rtems_termios_device_install( |
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[f53473f] | 223 | PL011, |
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[362cf319] | 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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[f53473f] | 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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[362cf319] | 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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[c32b1ef] | 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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[362cf319] | 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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[c344e58] | 250 | RTEMS_SYSINIT_ORDER_LAST_BUT_5 |
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[362cf319] | 251 | ); |
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