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serial: smh: Implement puts for DM

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This adds an implementation of puts for DM. The implementation is not as
clean as for the non-DM puts because we have to handle non-nul-terminated
string. We also handle short writes (though these are probably very
unusual).

Signed-off-by: Sean Anderson <sean.anderson@seco.com>
This commit is contained in:
Sean Anderson 2022-04-04 14:18:00 -04:00 committed by Tom Rini
parent 679190c41a
commit 34855b39be
2 changed files with 32 additions and 0 deletions
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1
drivers/serial/Kconfig
View file

@ -834,6 +834,7 @@ config SH_SCIF_CLK_FREQ
config SEMIHOSTING_SERIAL
bool "Semihosting UART support"
depends on SEMIHOSTING && !SERIAL_RX_BUFFER
imply SERIAL_PUTS
help
Select this to enable a serial UART using semihosting. Special halt
instructions will be issued which an external debugger (such as a

31
drivers/serial/serial_semihosting.c
View file

@ -5,12 +5,14 @@
#include <common.h>
#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)
*/
struct smh_serial_priv {
int infd;
@ -36,8 +38,36 @@ static int smh_serial_putc(struct udevice *dev, const char 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);
smh_puts(buf);
free(buf);
return len;
}
ret = smh_write(priv->outfd, s, len, &written);
if (written)
return written;
return ret;
}
static const struct dm_serial_ops smh_serial_ops = {
.putc = smh_serial_putc,
.puts = smh_serial_puts,
.getc = smh_serial_getc,
};
@ -53,6 +83,7 @@ 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;
}