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| author | Christophe Leroy <christophe.leroy@csgroup.eu> | 2020-12-23 12:38:46 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-28 18:12:34 +0300 |
| commit | a60526097f42eb98760d3c63c5de63fab309fe1a (patch) | |
| tree | 7725956945a752dc5fc3a9a467268ef9a202e848 /drivers/tty/serial/cpm_uart | |
| parent | 345523fab82760186bd453e2e6ebf7c21961610b (diff) | |
| download | linux-a60526097f42eb98760d3c63c5de63fab309fe1a.tar.xz | |
tty: serial: cpm_uart: Add udbg support for enabling xmon
In order to use xmon with powerpc 8xx, the serial driver
must provide udbg_putc() and udpb_getc().
Provide them via cpm_put_poll_char() and cpm_get_poll_char().
This requires CONFIG_CONSOLE_POLL.
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://lore.kernel.org/r/e4471bf81089252470efb3eed735d71a5b32adbd.1608716197.git.christophe.leroy@csgroup.eu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/cpm_uart')
| -rw-r--r-- | drivers/tty/serial/cpm_uart/cpm_uart_core.c | 40 |
1 files changed, 39 insertions, 1 deletions
diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c index 4df47d02b34b..3b899cc7e362 100644 --- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c +++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c @@ -1107,6 +1107,32 @@ static void cpm_put_poll_char(struct uart_port *port, ch[0] = (char)c; cpm_uart_early_write(pinfo, ch, 1, false); } + +static struct uart_port *udbg_port; + +static void udbg_cpm_putc(char c) +{ + if (c == '\n') + cpm_put_poll_char(udbg_port, '\r'); + cpm_put_poll_char(udbg_port, c); +} + +static int udbg_cpm_getc_poll(void) +{ + int c = cpm_get_poll_char(udbg_port); + + return c == NO_POLL_CHAR ? -1 : c; +} + +static int udbg_cpm_getc(void) +{ + int c; + + while ((c = udbg_cpm_getc_poll()) == -1) + cpu_relax(); + return c; +} + #endif /* CONFIG_CONSOLE_POLL */ static const struct uart_ops cpm_uart_pops = { @@ -1237,7 +1263,10 @@ static int cpm_uart_init_port(struct device_node *np, } #ifdef CONFIG_PPC_EARLY_DEBUG_CPM - udbg_putc = NULL; +#ifdef CONFIG_CONSOLE_POLL + if (!udbg_port) +#endif + udbg_putc = NULL; #endif return cpm_uart_request_port(&pinfo->port); @@ -1358,6 +1387,15 @@ static int __init cpm_uart_console_setup(struct console *co, char *options) uart_set_options(port, co, baud, parity, bits, flow); cpm_line_cr_cmd(pinfo, CPM_CR_RESTART_TX); +#ifdef CONFIG_CONSOLE_POLL + if (!udbg_port) { + udbg_port = &pinfo->port; + udbg_putc = udbg_cpm_putc; + udbg_getc = udbg_cpm_getc; + udbg_getc_poll = udbg_cpm_getc_poll; + } +#endif + return 0; } |