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3549 | rimsky | 1 | /* |
2 | * Copyright (c) 2006 Ondrej Palkovsky |
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3 | * Copyright (c) 2008 Martin Decky |
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4 | * Copyright (c) 2008 Pavel Rimsky |
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5 | * All rights reserved. |
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6 | * |
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7 | * Redistribution and use in source and binary forms, with or without |
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8 | * modification, are permitted provided that the following conditions |
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9 | * are met: |
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10 | * |
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11 | * - Redistributions of source code must retain the above copyright |
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12 | * notice, this list of conditions and the following disclaimer. |
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13 | * - Redistributions in binary form must reproduce the above copyright |
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14 | * notice, this list of conditions and the following disclaimer in the |
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15 | * documentation and/or other materials provided with the distribution. |
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16 | * - The name of the author may not be used to endorse or promote products |
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17 | * derived from this software without specific prior written permission. |
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18 | * |
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19 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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20 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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21 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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22 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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23 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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24 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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25 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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26 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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27 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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28 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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29 | */ |
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30 | |||
31 | /** @defgroup sgcnfb SGCN |
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32 | * @brief userland driver of the Serengeti console output |
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33 | * @{ |
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34 | */ |
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35 | /** @file |
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36 | */ |
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37 | |||
38 | #include <async.h> |
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39 | #include <sysinfo.h> |
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40 | #include <as.h> |
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41 | #include <errno.h> |
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42 | #include <stdio.h> |
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43 | #include <ddi.h> |
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44 | |||
3582 | rimsky | 45 | #include "serial_console.h" |
3549 | rimsky | 46 | #include "sgcn.h" |
47 | |||
48 | #define WIDTH 80 |
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49 | #define HEIGHT 24 |
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50 | |||
51 | /** |
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52 | * Virtual address mapped to SRAM. |
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53 | */ |
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54 | static uintptr_t sram_virt_addr; |
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55 | |||
56 | /** |
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57 | * SGCN buffer offset within SGCN. |
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58 | */ |
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59 | static uintptr_t sram_buffer_offset; |
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60 | |||
61 | /** |
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62 | * SGCN buffer header. It is placed at the very beginning of the SGCN |
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63 | * buffer. |
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64 | */ |
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65 | typedef struct { |
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66 | /** hard-wired to "CON" */ |
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67 | char magic[4]; |
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68 | |||
69 | /** we don't need this */ |
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3582 | rimsky | 70 | char unused[24]; |
3549 | rimsky | 71 | |
72 | /** offset within the SGCN buffer of the output buffer start */ |
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73 | uint32_t out_begin; |
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74 | |||
75 | /** offset within the SGCN buffer of the output buffer end */ |
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76 | uint32_t out_end; |
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77 | |||
78 | /** offset within the SGCN buffer of the output buffer read pointer */ |
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79 | uint32_t out_rdptr; |
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80 | |||
81 | /** offset within the SGCN buffer of the output buffer write pointer */ |
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82 | uint32_t out_wrptr; |
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83 | } __attribute__ ((packed)) sgcn_buffer_header_t; |
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84 | |||
85 | |||
86 | /* |
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87 | * Returns a pointer to the object of a given type which is placed at the given |
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88 | * offset from the console buffer beginning. |
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89 | */ |
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90 | #define SGCN_BUFFER(type, offset) \ |
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91 | ((type *) (sram_virt_addr + sram_buffer_offset + (offset))) |
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92 | |||
93 | /** Returns a pointer to the console buffer header. */ |
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94 | #define SGCN_BUFFER_HEADER (SGCN_BUFFER(sgcn_buffer_header_t, 0)) |
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95 | |||
3618 | rimsky | 96 | /** |
97 | * Pushes the character to the SGCN serial. |
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98 | * @param c character to be pushed |
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99 | */ |
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3549 | rimsky | 100 | static void sgcn_putc(char c) |
101 | { |
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102 | uint32_t begin = SGCN_BUFFER_HEADER->out_begin; |
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103 | uint32_t end = SGCN_BUFFER_HEADER->out_end; |
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104 | uint32_t size = end - begin; |
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105 | |||
106 | /* we need pointers to volatile variables */ |
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107 | volatile char *buf_ptr = (volatile char *) |
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108 | SGCN_BUFFER(char, SGCN_BUFFER_HEADER->out_wrptr); |
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109 | volatile uint32_t *out_wrptr_ptr = &(SGCN_BUFFER_HEADER->out_wrptr); |
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110 | volatile uint32_t *out_rdptr_ptr = &(SGCN_BUFFER_HEADER->out_rdptr); |
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111 | |||
112 | uint32_t new_wrptr = (((*out_wrptr_ptr) - begin + 1) % size) + begin; |
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113 | while (*out_rdptr_ptr == new_wrptr) |
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114 | ; |
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115 | *buf_ptr = c; |
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116 | *out_wrptr_ptr = new_wrptr; |
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117 | } |
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118 | |||
3618 | rimsky | 119 | /** |
120 | * Initializes the SGCN serial driver. |
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121 | */ |
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3549 | rimsky | 122 | int sgcn_init(void) |
123 | { |
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3618 | rimsky | 124 | sram_virt_addr = (uintptr_t) as_get_mappable_page( |
125 | sysinfo_value("sram.area.size")); |
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3549 | rimsky | 126 | int result = physmem_map( |
127 | (void *) sysinfo_value("sram.address.physical"), |
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128 | (void *) sram_virt_addr, |
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129 | sysinfo_value("sram.area.size") / PAGE_SIZE, |
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130 | AS_AREA_READ | AS_AREA_WRITE |
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131 | ); |
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132 | if (result != 0) { |
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133 | printf("SGCN: uspace driver couldn't map physical memory: %d\n", |
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134 | result); |
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135 | } |
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136 | |||
3582 | rimsky | 137 | serial_console_init(sgcn_putc, WIDTH, HEIGHT); |
138 | |||
3549 | rimsky | 139 | sram_buffer_offset = sysinfo_value("sram.buffer.offset"); |
140 | |||
3716 | svoboda | 141 | async_set_client_connection(serial_client_connection); |
3549 | rimsky | 142 | return 0; |
143 | } |
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144 | |||
145 | /** |
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146 | * @} |
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147 | */ |
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3618 | rimsky | 148 |