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serial: qcom_geni_serial: Support kgdboc_earlycon

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Implement the read() function in the early console driver.  With
recent kgdb patches this allows you to use kgdb to debug fairly early
into the system boot.

We only bother implementing this if polling is enabled since kgdb
can't be enabled without that.

Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Link: https://lore.kernel.org/r/20200507130644.v4.10.If2deff9679a62c1ce1b8f2558a8635dc837adf8c@changeid
Signed-off-by: Daniel Thompson <daniel.thompson@linaro.org>
This commit is contained in:
Douglas Anderson 2020-05-07 13:08:48 -07:00 committed by Daniel Thompson
parent a4912303ac
commit 205b5bdda2
1 changed files with 32 additions and 0 deletions
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32
drivers/tty/serial/qcom_geni_serial.c
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@ -1090,6 +1090,36 @@ static void qcom_geni_serial_earlycon_write(struct console *con,
__qcom_geni_serial_console_write(&dev->port, s, n);
}
#ifdef CONFIG_CONSOLE_POLL
static int qcom_geni_serial_earlycon_read(struct console *con,
char *s, unsigned int n)
{
struct earlycon_device *dev = con->data;
struct uart_port *uport = &dev->port;
int num_read = 0;
int ch;
while (num_read < n) {
ch = qcom_geni_serial_get_char(uport);
if (ch == NO_POLL_CHAR)
break;
s[num_read++] = ch;
}
return num_read;
}
static void __init qcom_geni_serial_enable_early_read(struct geni_se *se,
struct console *con)
{
geni_se_setup_s_cmd(se, UART_START_READ, 0);
con->read = qcom_geni_serial_earlycon_read;
}
#else
static inline void qcom_geni_serial_enable_early_read(struct geni_se *se,
struct console *con) { }
#endif
static int __init qcom_geni_serial_earlycon_setup(struct earlycon_device *dev,
const char *opt)
{
@ -1136,6 +1166,8 @@ static int __init qcom_geni_serial_earlycon_setup(struct earlycon_device *dev,
dev->con->write = qcom_geni_serial_earlycon_write;
dev->con->setup = NULL;
qcom_geni_serial_enable_early_read(&se, dev->con);
return 0;
}
OF_EARLYCON_DECLARE(qcom_geni, "qcom,geni-debug-uart",