1 | /** |
---|
2 | * @file |
---|
3 | * |
---|
4 | * @ingroup QorIQUartBridge |
---|
5 | * |
---|
6 | * @brief UART bridge master implementation. |
---|
7 | */ |
---|
8 | |
---|
9 | /* |
---|
10 | * Copyright (c) 2011 embedded brains GmbH. All rights reserved. |
---|
11 | * |
---|
12 | * embedded brains GmbH |
---|
13 | * Obere Lagerstr. 30 |
---|
14 | * 82178 Puchheim |
---|
15 | * Germany |
---|
16 | * <rtems@embedded-brains.de> |
---|
17 | * |
---|
18 | * The license and distribution terms for this file may be |
---|
19 | * found in the file LICENSE in this distribution or at |
---|
20 | * http://www.rtems.com/license/LICENSE. |
---|
21 | * |
---|
22 | * $Id$ |
---|
23 | */ |
---|
24 | |
---|
25 | #include <sys/stat.h> |
---|
26 | #include <assert.h> |
---|
27 | #include <fcntl.h> |
---|
28 | #include <unistd.h> |
---|
29 | #include <termios.h> |
---|
30 | |
---|
31 | #include <libchip/sersupp.h> |
---|
32 | |
---|
33 | #include <bspopts.h> |
---|
34 | #include <bsp/uart-bridge.h> |
---|
35 | |
---|
36 | #define TRANSMIT_EVENT RTEMS_EVENT_13 |
---|
37 | |
---|
38 | static void serial_settings(int fd) |
---|
39 | { |
---|
40 | struct termios term; |
---|
41 | int rv = tcgetattr(fd, &term); |
---|
42 | assert(rv == 0); |
---|
43 | |
---|
44 | term.c_iflag &= ~(IGNBRK | BRKINT | PARMRK | ISTRIP | INLCR | IGNCR | ICRNL | IXON); |
---|
45 | term.c_oflag &= ~OPOST; |
---|
46 | term.c_lflag &= ~(ECHO | ECHONL | ICANON | ISIG | IEXTEN); |
---|
47 | term.c_cflag &= ~(CSIZE | PARENB); |
---|
48 | term.c_cflag |= CS8; |
---|
49 | |
---|
50 | term.c_cc [VMIN] = 1; |
---|
51 | term.c_cc [VTIME] = 1; |
---|
52 | |
---|
53 | rv = tcsetattr(fd, TCSANOW, &term); |
---|
54 | assert(rv == 0); |
---|
55 | } |
---|
56 | |
---|
57 | static void uart_bridge_master_service(intercom_packet *packet, void *arg) |
---|
58 | { |
---|
59 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
60 | uart_bridge_master_control *control = arg; |
---|
61 | |
---|
62 | sc = rtems_chain_append_with_notification( |
---|
63 | &control->transmit_fifo, |
---|
64 | &packet->glue.node, |
---|
65 | control->transmit_task, |
---|
66 | TRANSMIT_EVENT |
---|
67 | ); |
---|
68 | assert(sc == RTEMS_SUCCESSFUL); |
---|
69 | } |
---|
70 | |
---|
71 | static void receive_task(rtems_task_argument arg) |
---|
72 | { |
---|
73 | uart_bridge_master_control *control = (uart_bridge_master_control *) arg; |
---|
74 | intercom_type type = control->type; |
---|
75 | |
---|
76 | int fd = open(control->device_path, O_RDONLY); |
---|
77 | assert(fd >= 0); |
---|
78 | |
---|
79 | serial_settings(fd); |
---|
80 | |
---|
81 | while (true) { |
---|
82 | intercom_packet *packet = qoriq_intercom_allocate_packet( |
---|
83 | type, |
---|
84 | INTERCOM_SIZE_64 |
---|
85 | ); |
---|
86 | ssize_t in = read(fd, packet->data, packet->size - 1); |
---|
87 | if (in > 0) { |
---|
88 | packet->size = (size_t) in; |
---|
89 | qoriq_intercom_send_packet(QORIQ_UART_BRIDGE_SLAVE_CORE, packet); |
---|
90 | } else { |
---|
91 | qoriq_intercom_free_packet(packet); |
---|
92 | } |
---|
93 | } |
---|
94 | } |
---|
95 | |
---|
96 | static void transmit_task(rtems_task_argument arg) |
---|
97 | { |
---|
98 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
99 | uart_bridge_master_control *control = (uart_bridge_master_control *) arg; |
---|
100 | rtems_chain_control *fifo = &control->transmit_fifo; |
---|
101 | |
---|
102 | int fd = open(control->device_path, O_WRONLY); |
---|
103 | assert(fd >= 0); |
---|
104 | |
---|
105 | serial_settings(fd); |
---|
106 | |
---|
107 | while (true) { |
---|
108 | intercom_packet *packet = NULL; |
---|
109 | sc = rtems_chain_get_with_wait( |
---|
110 | fifo, |
---|
111 | TRANSMIT_EVENT, |
---|
112 | RTEMS_NO_TIMEOUT, |
---|
113 | (rtems_chain_node **) &packet |
---|
114 | ); |
---|
115 | assert(sc == RTEMS_SUCCESSFUL); |
---|
116 | write(fd, packet->data, packet->size); |
---|
117 | qoriq_intercom_free_packet(packet); |
---|
118 | } |
---|
119 | } |
---|
120 | |
---|
121 | static rtems_id create_task( |
---|
122 | char name, |
---|
123 | rtems_task_entry entry, |
---|
124 | uart_bridge_master_control *control |
---|
125 | ) |
---|
126 | { |
---|
127 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
---|
128 | rtems_id task = RTEMS_ID_NONE; |
---|
129 | char index = (char) ('0' + control->type - INTERCOM_TYPE_UART_0); |
---|
130 | |
---|
131 | sc = rtems_task_create( |
---|
132 | rtems_build_name('U', 'B', name, index), |
---|
133 | QORIQ_UART_BRIDGE_TASK_PRIORITY, |
---|
134 | 0, |
---|
135 | RTEMS_DEFAULT_MODES, |
---|
136 | RTEMS_DEFAULT_ATTRIBUTES, |
---|
137 | &task |
---|
138 | ); |
---|
139 | assert(sc == RTEMS_SUCCESSFUL); |
---|
140 | |
---|
141 | sc = rtems_task_start( |
---|
142 | task, |
---|
143 | entry, |
---|
144 | (rtems_task_argument) control |
---|
145 | ); |
---|
146 | assert(sc == RTEMS_SUCCESSFUL); |
---|
147 | |
---|
148 | return task; |
---|
149 | } |
---|
150 | |
---|
151 | static void initialize(int minor) |
---|
152 | { |
---|
153 | console_tbl *ct = Console_Port_Tbl [minor]; |
---|
154 | uart_bridge_master_control *control = ct->pDeviceParams; |
---|
155 | intercom_type type = control->type; |
---|
156 | |
---|
157 | qoriq_intercom_service_install(type, uart_bridge_master_service, control); |
---|
158 | create_task('R', receive_task, control); |
---|
159 | control->transmit_task = create_task('T', transmit_task, control); |
---|
160 | } |
---|
161 | |
---|
162 | static int first_open(int major, int minor, void *arg) |
---|
163 | { |
---|
164 | return -1; |
---|
165 | } |
---|
166 | |
---|
167 | static int last_close(int major, int minor, void *arg) |
---|
168 | { |
---|
169 | return -1; |
---|
170 | } |
---|
171 | |
---|
172 | static int read_polled(int minor) |
---|
173 | { |
---|
174 | return -1; |
---|
175 | } |
---|
176 | |
---|
177 | static void write_polled(int minor, char c) |
---|
178 | { |
---|
179 | /* Do nothing */ |
---|
180 | } |
---|
181 | |
---|
182 | static int set_attributes(int minor, const struct termios *term) |
---|
183 | { |
---|
184 | return -1; |
---|
185 | } |
---|
186 | |
---|
187 | console_fns qoriq_uart_bridge_master = { |
---|
188 | .deviceProbe = libchip_serial_default_probe, |
---|
189 | .deviceFirstOpen = first_open, |
---|
190 | .deviceLastClose = last_close, |
---|
191 | .deviceRead = read_polled, |
---|
192 | .deviceWrite = NULL, |
---|
193 | .deviceInitialize = initialize, |
---|
194 | .deviceWritePolled = write_polled, |
---|
195 | .deviceSetAttributes = set_attributes, |
---|
196 | .deviceOutputUsesInterrupts = false |
---|
197 | }; |
---|