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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 | // SPDX-License-Identifier: GPL-2.0+ /* * Copyright (C) 2022 Sean Anderson <sean.anderson@seco.com> */ #include <dm.h> #include <malloc.h> #include <serial.h> #include <semihosting.h> /** * struct smh_serial_priv - Semihosting serial private data * @infd: stdin file descriptor (or error) * @outfd: stdout file descriptor (or error) * @counter: Counter used to fake pending every other call */ struct smh_serial_priv { int infd; int outfd; unsigned counter; }; #if CONFIG_IS_ENABLED(DM_SERIAL) static int smh_serial_getc(struct udevice *dev) { char ch = 0; struct smh_serial_priv *priv = dev_get_priv(dev); if (priv->infd < 0) return smh_getc(); smh_read(priv->infd, &ch, sizeof(ch)); return ch; } static int smh_serial_putc(struct udevice *dev, const char ch) { smh_putc(ch); return 0; } static ssize_t smh_serial_puts(struct udevice *dev, const char *s, size_t len) { int ret; struct smh_serial_priv *priv = dev_get_priv(dev); unsigned long written; if (priv->outfd < 0) { char *buf; /* Try and avoid a copy if we can */ if (!s[len + 1]) { smh_puts(s); return len; } buf = strndup(s, len); if (!buf) return -ENOMEM; smh_puts(buf); free(buf); return len; } ret = smh_write(priv->outfd, s, len, &written); if (written) return written; return ret; } static int smh_serial_pending(struct udevice *dev, bool input) { struct smh_serial_priv *priv = dev_get_priv(dev); if (input) return priv->counter++ & 1; return false; } static const struct dm_serial_ops smh_serial_ops = { .putc = smh_serial_putc, .puts = smh_serial_puts, .getc = smh_serial_getc, .pending = smh_serial_pending, }; static int smh_serial_bind(struct udevice *dev) { if (semihosting_enabled()) return 0; return -ENOENT; } static int smh_serial_probe(struct udevice *dev) { struct smh_serial_priv *priv = dev_get_priv(dev); priv->infd = smh_open(":tt", MODE_READ); priv->outfd = smh_open(":tt", MODE_WRITE); return 0; } U_BOOT_DRIVER(smh_serial) = { .name = "serial_semihosting", .id = UCLASS_SERIAL, .bind = smh_serial_bind, .probe = smh_serial_probe, .priv_auto = sizeof(struct smh_serial_priv), .ops = &smh_serial_ops, .flags = DM_FLAG_PRE_RELOC, }; U_BOOT_DRVINFO(smh_serial) = { .name = "serial_semihosting", }; #else /* DM_SERIAL */ static int infd = -ENODEV; static int outfd = -ENODEV; static unsigned counter = 1; static int smh_serial_start(void) { infd = smh_open(":tt", MODE_READ); outfd = smh_open(":tt", MODE_WRITE); return 0; } static int smh_serial_stop(void) { if (outfd >= 0) smh_close(outfd); return 0; } static void smh_serial_setbrg(void) { } static int smh_serial_getc(void) { char ch = 0; if (infd < 0) return smh_getc(); smh_read(infd, &ch, sizeof(ch)); return ch; } static int smh_serial_tstc(void) { return counter++ & 1; } static void smh_serial_puts(const char *s) { ulong unused; if (outfd < 0) smh_puts(s); else smh_write(outfd, s, strlen(s), &unused); } struct serial_device serial_smh_device = { .name = "serial_smh", .start = smh_serial_start, .stop = smh_serial_stop, .setbrg = smh_serial_setbrg, .getc = smh_serial_getc, .tstc = smh_serial_tstc, .putc = smh_putc, .puts = smh_serial_puts, }; void smh_serial_initialize(void) { if (semihosting_enabled()) serial_register(&serial_smh_device); } __weak struct serial_device *default_serial_console(void) { return &serial_smh_device; } #endif #ifdef CONFIG_DEBUG_UART_SEMIHOSTING #include <debug_uart.h> static inline void _debug_uart_init(void) { } static inline void _debug_uart_putc(int c) { smh_putc(c); } DEBUG_UART_FUNCS #endif |