drivers/serial/sandbox.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (c) 2011 The Chromium OS Authors.
   4  */
   5
   6 /*
   7  * This provide a test serial port. It provides an emulated serial port where
   8  * a test program and read out the serial output and inject serial input for
   9  * U-Boot.
  10  */
  11
  12 #include <common.h>
  13 #include <console.h>
  14 #include <dm.h>
  15 #include <fdtdec.h>
  16 #include <lcd.h>
  17 #include <os.h>
  18 #include <serial.h>
  19 #include <video.h>
  20 #include <linux/compiler.h>
  21 #include <asm/state.h>
  22
  23 DECLARE_GLOBAL_DATA_PTR;
  24
  25 #if CONFIG_IS_ENABLED(OF_CONTROL)
  26
  27 /*
  28  *
  29  *   serial_buf: A buffer that holds keyboard characters for the
  30  *               Sandbox U-Boot.
  31  *
  32  * invariants:
  33  *   serial_buf_write            == serial_buf_read -> empty buffer
  34  *   (serial_buf_write + 1) % 16 == serial_buf_read -> full buffer
  35  */
  36 static unsigned char serial_buf[16];
  37 static unsigned int serial_buf_write;
  38 static unsigned int serial_buf_read;
  39
  40 struct sandbox_serial_platdata {
  41         int colour;     /* Text colour to use for output, -1 for none */
  42 };
  43
  44 struct sandbox_serial_priv {
  45         bool start_of_line;
  46 };
  47
  48 /**
  49  * output_ansi_colour() - Output an ANSI colour code
  50  *
  51  * @colour: Colour to output (0-7)
  52  */
  53 static void output_ansi_colour(int colour)
  54 {
  55         char ansi_code[] = "\x1b[1;3Xm";
  56
  57         ansi_code[5] = '0' + colour;
  58         os_write(1, ansi_code, sizeof(ansi_code) - 1);
  59 }
  60
  61 static void output_ansi_reset(void)
  62 {
  63         os_write(1, "\x1b[0m", 4);
  64 }
  65
  66 static int sandbox_serial_probe(struct udevice *dev)
  67 {
  68         struct sandbox_state *state = state_get_current();
  69         struct sandbox_serial_priv *priv = dev_get_priv(dev);
  70
  71         if (state->term_raw != STATE_TERM_COOKED)
  72                 os_tty_raw(0, state->term_raw == STATE_TERM_RAW_WITH_SIGS);
  73         priv->start_of_line = 0;
  74
  75         if (state->term_raw != STATE_TERM_RAW)
  76                 disable_ctrlc(1);
  77
  78         return 0;
  79 }
  80
  81 static int sandbox_serial_remove(struct udevice *dev)
  82 {
  83         struct sandbox_serial_platdata *plat = dev->platdata;
  84
  85         if (plat->colour != -1)
  86                 output_ansi_reset();
  87
  88         return 0;
  89 }
  90
  91 static int sandbox_serial_putc(struct udevice *dev, const char ch)
  92 {
  93         struct sandbox_serial_priv *priv = dev_get_priv(dev);
  94         struct sandbox_serial_platdata *plat = dev->platdata;
  95
  96         if (priv->start_of_line && plat->colour != -1) {
  97                 priv->start_of_line = false;
  98                 output_ansi_colour(plat->colour);
  99         }
 100
 101         os_write(1, &ch, 1);
 102         if (ch == '\n')
 103                 priv->start_of_line = true;
 104
 105         return 0;
 106 }
 107
 108 static unsigned int increment_buffer_index(unsigned int index)
 109 {
 110         return (index + 1) % ARRAY_SIZE(serial_buf);
 111 }
 112
 113 static int sandbox_serial_pending(struct udevice *dev, bool input)
 114 {
 115         const unsigned int next_index =
 116                 increment_buffer_index(serial_buf_write);
 117         ssize_t count;
 118
 119         if (!input)
 120                 return 0;
 121
 122         os_usleep(100);
 123 #ifndef CONFIG_SPL_BUILD
 124         video_sync_all();
 125 #endif
 126         if (next_index == serial_buf_read)
 127                 return 1;       /* buffer full */
 128
 129         count = os_read(0, &serial_buf[serial_buf_write], 1);
 130         if (count == 1)
 131                 serial_buf_write = next_index;
 132
 133         return serial_buf_write != serial_buf_read;
 134 }
 135
 136 static int sandbox_serial_getc(struct udevice *dev)
 137 {
 138         int result;
 139
 140         if (!sandbox_serial_pending(dev, true))
 141                 return -EAGAIN; /* buffer empty */
 142
 143         result = serial_buf[serial_buf_read];
 144         serial_buf_read = increment_buffer_index(serial_buf_read);
 145         return result;
 146 }
 147 #endif /* CONFIG_IS_ENABLED(OF_CONTROL) */
 148
 149 #ifdef CONFIG_DEBUG_UART_SANDBOX
 150
 151 #include <debug_uart.h>
 152
 153 static inline void _debug_uart_init(void)
 154 {
 155 }
 156
 157 static inline void _debug_uart_putc(int ch)
 158 {
 159         os_putc(ch);
 160 }
 161
 162 DEBUG_UART_FUNCS
 163
 164 #endif /* CONFIG_DEBUG_UART_SANDBOX */
 165
 166 static int sandbox_serial_getconfig(struct udevice *dev, uint *serial_config)
 167 {
 168         uint config = SERIAL_DEFAULT_CONFIG;
 169
 170         if (!serial_config)
 171                 return -EINVAL;
 172
 173         *serial_config = config;
 174
 175         return 0;
 176 }
 177
 178 static int sandbox_serial_setconfig(struct udevice *dev, uint serial_config)
 179 {
 180         u8 parity = SERIAL_GET_PARITY(serial_config);
 181         u8 bits = SERIAL_GET_BITS(serial_config);
 182         u8 stop = SERIAL_GET_STOP(serial_config);
 183
 184         if (bits != SERIAL_8_BITS || stop != SERIAL_ONE_STOP ||
 185             parity != SERIAL_PAR_NONE)
 186                 return -ENOTSUPP; /* not supported in driver*/
 187
 188         return 0;
 189 }
 190
 191 static int sandbox_serial_getinfo(struct udevice *dev,
 192                                   struct serial_device_info *serial_info)
 193 {
 194         struct serial_device_info info = {
 195                 .type = SERIAL_CHIP_UNKNOWN,
 196                 .addr_space = SERIAL_ADDRESS_SPACE_IO,
 197                 .addr = SERIAL_DEFAULT_ADDRESS,
 198                 .reg_width = 1,
 199                 .reg_offset = 0,
 200                 .reg_shift = 0,
 201         };
 202
 203         if (!serial_info)
 204                 return -EINVAL;
 205
 206         *serial_info = info;
 207
 208         return 0;
 209 }
 210
 211 #if CONFIG_IS_ENABLED(OF_CONTROL)
 212 static const char * const ansi_colour[] = {
 213         "black", "red", "green", "yellow", "blue", "megenta", "cyan",
 214         "white",
 215 };
 216
 217 static int sandbox_serial_ofdata_to_platdata(struct udevice *dev)
 218 {
 219         struct sandbox_serial_platdata *plat = dev->platdata;
 220         const char *colour;
 221         int i;
 222
 223         if (CONFIG_IS_ENABLED(OF_PLATDATA))
 224                 return 0;
 225         plat->colour = -1;
 226         colour = fdt_getprop(gd->fdt_blob, dev_of_offset(dev),
 227                              "sandbox,text-colour", NULL);
 228         if (colour) {
 229                 for (i = 0; i < ARRAY_SIZE(ansi_colour); i++) {
 230                         if (!strcmp(colour, ansi_colour[i])) {
 231                                 plat->colour = i;
 232                                 break;
 233                         }
 234                 }
 235         }
 236
 237         return 0;
 238 }
 239
 240 static const struct dm_serial_ops sandbox_serial_ops = {
 241         .putc = sandbox_serial_putc,
 242         .pending = sandbox_serial_pending,
 243         .getc = sandbox_serial_getc,
 244         .getconfig = sandbox_serial_getconfig,
 245         .setconfig = sandbox_serial_setconfig,
 246         .getinfo = sandbox_serial_getinfo,
 247 };
 248
 249 static const struct udevice_id sandbox_serial_ids[] = {
 250         { .compatible = "sandbox,serial" },
 251         { }
 252 };
 253
 254 U_BOOT_DRIVER(serial_sandbox) = {
 255         .name   = "serial_sandbox",
 256         .id     = UCLASS_SERIAL,
 257         .of_match = sandbox_serial_ids,
 258         .ofdata_to_platdata = sandbox_serial_ofdata_to_platdata,
 259         .platdata_auto_alloc_size = sizeof(struct sandbox_serial_platdata),
 260         .priv_auto_alloc_size = sizeof(struct sandbox_serial_priv),
 261         .probe = sandbox_serial_probe,
 262         .remove = sandbox_serial_remove,
 263         .ops    = &sandbox_serial_ops,
 264         .flags = DM_FLAG_PRE_RELOC,
 265 };
 266
 267 static const struct sandbox_serial_platdata platdata_non_fdt = {
 268         .colour = -1,
 269 };
 270
 271 U_BOOT_DEVICE(serial_sandbox_non_fdt) = {
 272         .name = "serial_sandbox",
 273         .platdata = &platdata_non_fdt,
 274 };
 275 #endif /* CONFIG_IS_ENABLED(OF_CONTROL) */