diff options
Diffstat (limited to 'drivers/serial')
| -rw-r--r-- | drivers/serial/serial_semihosting.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/drivers/serial/serial_semihosting.c b/drivers/serial/serial_semihosting.c index 2561414e40..cfa1ec3148 100644 --- a/drivers/serial/serial_semihosting.c +++ b/drivers/serial/serial_semihosting.c @@ -13,10 +13,12 @@ * 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) @@ -68,10 +70,20 @@ static ssize_t smh_serial_puts(struct udevice *dev, const char *s, size_t len) 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) @@ -106,6 +118,7 @@ U_BOOT_DRVINFO(smh_serial) = { #else /* DM_SERIAL */ static int infd = -ENODEV; static int outfd = -ENODEV; +static unsigned counter = 1; static int smh_serial_start(void) { @@ -138,7 +151,7 @@ static int smh_serial_getc(void) static int smh_serial_tstc(void) { - return 1; + return counter++ & 1; } static void smh_serial_puts(const char *s) |