1 | /* |
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2 | * Copyright (c) 2013-2014 embedded brains GmbH. All rights reserved. |
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3 | * |
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4 | * embedded brains GmbH |
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5 | * Dornierstr. 4 |
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6 | * 82178 Puchheim |
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7 | * Germany |
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8 | * <info@embedded-brains.de> |
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9 | * |
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10 | * The license and distribution terms for this file may be |
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11 | * found in the file LICENSE in this distribution or at |
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12 | * http://www.rtems.org/license/LICENSE. |
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13 | */ |
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14 | |
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15 | #include <assert.h> |
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16 | |
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17 | #include <bsp/irq.h> |
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18 | #include <bsp/arm-pl050.h> |
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19 | |
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20 | static volatile pl050 *pl050_get_regs(rtems_termios_device_context *base) |
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21 | { |
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22 | arm_pl050_context *ctx = (arm_pl050_context *) base; |
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23 | |
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24 | return ctx->regs; |
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25 | } |
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26 | |
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27 | static void pl050_interrupt(void *arg) |
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28 | { |
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29 | rtems_termios_tty *tty = arg; |
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30 | rtems_termios_device_context *base = rtems_termios_get_device_context(tty); |
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31 | volatile pl050 *regs = pl050_get_regs(base); |
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32 | uint32_t kmiir_rx = PL050_KMIIR_KMIRXINTR; |
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33 | uint32_t kmiir_tx = (regs->kmicr & PL050_KMICR_KMITXINTREN) != 0 ? |
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34 | PL050_KMIIR_KMITXINTR : 0; |
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35 | uint32_t kmiir = regs->kmiir; |
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36 | |
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37 | if ((kmiir & kmiir_rx) != 0) { |
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38 | char c = (char) PL050_KMIDATA_KMIDATA_GET(regs->kmidata); |
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39 | |
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40 | rtems_termios_enqueue_raw_characters(tty, &c, 1); |
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41 | } |
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42 | |
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43 | if ((kmiir & kmiir_tx) != 0) { |
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44 | rtems_termios_dequeue_characters(tty, 1); |
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45 | } |
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46 | } |
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47 | |
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48 | static bool pl050_first_open( |
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49 | struct rtems_termios_tty *tty, |
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50 | rtems_termios_device_context *base, |
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51 | struct termios *term, |
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52 | rtems_libio_open_close_args_t *args |
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53 | ) |
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54 | { |
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55 | arm_pl050_context *ctx = (arm_pl050_context *) base; |
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56 | volatile pl050 *regs = pl050_get_regs(base); |
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57 | rtems_status_code sc; |
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58 | |
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59 | rtems_termios_set_initial_baud(tty, ctx->initial_baud); |
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60 | |
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61 | regs->kmicr = PL050_KMICR_KMIEN | PL050_KMICR_KMIRXINTREN; |
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62 | |
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63 | sc = rtems_interrupt_handler_install( |
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64 | ctx->irq, |
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65 | "PL050", |
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66 | RTEMS_INTERRUPT_UNIQUE, |
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67 | pl050_interrupt, |
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68 | tty |
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69 | ); |
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70 | assert(sc == RTEMS_SUCCESSFUL); |
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71 | |
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72 | return true; |
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73 | } |
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74 | |
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75 | static void pl050_last_close( |
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76 | struct rtems_termios_tty *tty, |
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77 | rtems_termios_device_context *base, |
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78 | rtems_libio_open_close_args_t *args |
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79 | ) |
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80 | { |
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81 | arm_pl050_context *ctx = (arm_pl050_context *) base; |
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82 | volatile pl050 *regs = pl050_get_regs(base); |
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83 | rtems_status_code sc; |
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84 | |
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85 | regs->kmicr = 0; |
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86 | |
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87 | sc = rtems_interrupt_handler_remove( |
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88 | ctx->irq, |
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89 | pl050_interrupt, |
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90 | tty |
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91 | ); |
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92 | assert(sc == RTEMS_SUCCESSFUL); |
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93 | } |
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94 | |
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95 | static void pl050_write_support( |
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96 | rtems_termios_device_context *base, |
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97 | const char *s, |
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98 | size_t n |
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99 | ) |
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100 | { |
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101 | volatile pl050 *regs = pl050_get_regs(base); |
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102 | |
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103 | if (n > 0) { |
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104 | regs->kmidata = PL050_KMIDATA_KMIDATA(s[0]); |
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105 | regs->kmicr |= PL050_KMICR_KMITXINTREN; |
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106 | } else { |
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107 | regs->kmicr &= ~PL050_KMICR_KMITXINTREN; |
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108 | } |
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109 | } |
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110 | |
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111 | const rtems_termios_device_handler arm_pl050_fns = { |
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112 | .first_open = pl050_first_open, |
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113 | .last_close = pl050_last_close, |
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114 | .write = pl050_write_support, |
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115 | .mode = TERMIOS_IRQ_DRIVEN |
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116 | }; |
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