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