From: Geert Uytterhoeven <geert+renesas@glider.be> To: Chris Brandt <chris.brandt@renesas.com>, Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>, Ulrich Hecht <uli@fpond.eu>, Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Jiri Slaby <jslaby@suse.com>, linux-renesas-soc@vger.kernel.org, linux-sh@vger.kernel.org, linux-serial@vger.kernel.org, Geert Uytterhoeven <geert+renesas@glider.be> Subject: [PATCH/RFC 1/4] sh-sci: Use a separate sci_port for earlycon Date: Mon, 06 Aug 2018 14:07:52 +0000 [thread overview] Message-ID: <20180806140755.24087-2-geert+renesas@glider.be> (raw) In-Reply-To: <20180806140755.24087-1-geert+renesas@glider.be> From: Yoshinori Sato <ysato@users.sourceforge.jp> The first sh-sci port and earlycon use the same sci_port. Hence after the initialization of the first port, earlycon may die. Fis this by assigning a separate sci_port for earlycon. Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp> [geert: Rebased, reworded] Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- I still don't fully understand why Sato-san needed this for H8/300, and we never needed it on Renesas ARM SoCs before. Also, I don't like the early index. --- drivers/tty/serial/sh-sci.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index ac4424bf6b136cc4..cf3195bed0246a3d 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -164,6 +164,8 @@ struct sci_port { #define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS static struct sci_port sci_ports[SCI_NPORTS]; +#define EARLY_INDEX 256 +static struct sci_port earlycon_port; static unsigned long sci_ports_in_use; static struct uart_driver sci_uart_driver; @@ -2941,12 +2943,16 @@ static void serial_console_putchar(struct uart_port *port, int ch) static void serial_console_write(struct console *co, const char *s, unsigned count) { - struct sci_port *sci_port = &sci_ports[co->index]; - struct uart_port *port = &sci_port->port; unsigned short bits, ctrl, ctrl_temp; + struct sci_port *sci_port; + struct uart_port *port; unsigned long flags; int locked = 1; + sci_port = (co->index != EARLY_INDEX) ? + &sci_ports[co->index] : &earlycon_port; + port = &sci_port->port; + #if defined(SUPPORT_SYSRQ) if (port->sysrq) locked = 0; @@ -3367,12 +3373,13 @@ static int __init early_console_setup(struct earlycon_device *device, device->port.serial_in = sci_serial_in; device->port.serial_out = sci_serial_out; device->port.type = type; - memcpy(&sci_ports[0].port, &device->port, sizeof(struct uart_port)); + device->con->index = EARLY_INDEX; + memcpy(&earlycon_port.port, &device->port, sizeof(struct uart_port)); port_cfg.type = type; - sci_ports[0].cfg = &port_cfg; - sci_ports[0].params = sci_probe_regmap(&port_cfg); - port_cfg.scscr = sci_serial_in(&sci_ports[0].port, SCSCR); - sci_serial_out(&sci_ports[0].port, SCSCR, + earlycon_port.cfg = &port_cfg; + earlycon_port.params = sci_probe_regmap(&port_cfg); + port_cfg.scscr = sci_serial_in(&earlycon_port.port, SCSCR); + sci_serial_out(&earlycon_port.port, SCSCR, SCSCR_RE | SCSCR_TE | port_cfg.scscr); device->con->write = serial_console_write; -- 2.17.1
WARNING: multiple messages have this Message-ID (diff)
From: Geert Uytterhoeven <geert+renesas@glider.be> To: Chris Brandt <chris.brandt@renesas.com>, Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>, Ulrich Hecht <uli@fpond.eu>, Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>, Jiri Slaby <jslaby@suse.com>, linux-renesas-soc@vger.kernel.org, linux-sh@vger.kernel.org, linux-serial@vger.kernel.org, Geert Uytterhoeven <geert+renesas@glider.be> Subject: [PATCH/RFC 1/4] sh-sci: Use a separate sci_port for earlycon Date: Mon, 6 Aug 2018 16:07:52 +0200 [thread overview] Message-ID: <20180806140755.24087-2-geert+renesas@glider.be> (raw) In-Reply-To: <20180806140755.24087-1-geert+renesas@glider.be> From: Yoshinori Sato <ysato@users.sourceforge.jp> The first sh-sci port and earlycon use the same sci_port. Hence after the initialization of the first port, earlycon may die. Fis this by assigning a separate sci_port for earlycon. Signed-off-by: Yoshinori Sato <ysato@users.sourceforge.jp> [geert: Rebased, reworded] Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- I still don't fully understand why Sato-san needed this for H8/300, and we never needed it on Renesas ARM SoCs before. Also, I don't like the early index. --- drivers/tty/serial/sh-sci.c | 21 ++++++++++++++------- 1 file changed, 14 insertions(+), 7 deletions(-) diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index ac4424bf6b136cc4..cf3195bed0246a3d 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -164,6 +164,8 @@ struct sci_port { #define SCI_NPORTS CONFIG_SERIAL_SH_SCI_NR_UARTS static struct sci_port sci_ports[SCI_NPORTS]; +#define EARLY_INDEX 256 +static struct sci_port earlycon_port; static unsigned long sci_ports_in_use; static struct uart_driver sci_uart_driver; @@ -2941,12 +2943,16 @@ static void serial_console_putchar(struct uart_port *port, int ch) static void serial_console_write(struct console *co, const char *s, unsigned count) { - struct sci_port *sci_port = &sci_ports[co->index]; - struct uart_port *port = &sci_port->port; unsigned short bits, ctrl, ctrl_temp; + struct sci_port *sci_port; + struct uart_port *port; unsigned long flags; int locked = 1; + sci_port = (co->index != EARLY_INDEX) ? + &sci_ports[co->index] : &earlycon_port; + port = &sci_port->port; + #if defined(SUPPORT_SYSRQ) if (port->sysrq) locked = 0; @@ -3367,12 +3373,13 @@ static int __init early_console_setup(struct earlycon_device *device, device->port.serial_in = sci_serial_in; device->port.serial_out = sci_serial_out; device->port.type = type; - memcpy(&sci_ports[0].port, &device->port, sizeof(struct uart_port)); + device->con->index = EARLY_INDEX; + memcpy(&earlycon_port.port, &device->port, sizeof(struct uart_port)); port_cfg.type = type; - sci_ports[0].cfg = &port_cfg; - sci_ports[0].params = sci_probe_regmap(&port_cfg); - port_cfg.scscr = sci_serial_in(&sci_ports[0].port, SCSCR); - sci_serial_out(&sci_ports[0].port, SCSCR, + earlycon_port.cfg = &port_cfg; + earlycon_port.params = sci_probe_regmap(&port_cfg); + port_cfg.scscr = sci_serial_in(&earlycon_port.port, SCSCR); + sci_serial_out(&earlycon_port.port, SCSCR, SCSCR_RE | SCSCR_TE | port_cfg.scscr); device->con->write = serial_console_write; -- 2.17.1
next prev parent reply other threads:[~2018-08-06 14:07 UTC|newest] Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top 2018-08-06 14:07 [PATCH/RFC 0/4] sh-sci : Do not derive regshift from regsize Geert Uytterhoeven 2018-08-06 14:07 ` Geert Uytterhoeven 2018-08-06 14:07 ` Geert Uytterhoeven [this message] 2018-08-06 14:07 ` [PATCH/RFC 1/4] sh-sci: Use a separate sci_port for earlycon Geert Uytterhoeven 2018-08-06 14:07 ` [PATCH/RFC 2/4] sh-sci: Take into account regshift to fix earlycon breakage Geert Uytterhoeven 2018-08-06 14:07 ` Geert Uytterhoeven 2018-08-06 14:07 ` [PATCH/RFC 3/4] Revert "serial: sh-sci: Compute the regshift value for SCI ports" Geert Uytterhoeven 2018-08-06 14:07 ` Geert Uytterhoeven 2018-08-06 14:16 ` Laurent Pinchart 2018-08-06 14:16 ` Laurent Pinchart 2018-08-06 14:34 ` Geert Uytterhoeven 2018-08-06 14:34 ` Geert Uytterhoeven 2018-08-06 14:41 ` Laurent Pinchart 2018-08-06 14:41 ` Laurent Pinchart 2018-08-06 14:52 ` Geert Uytterhoeven 2018-08-06 14:52 ` Geert Uytterhoeven 2018-08-06 14:07 ` [PATCH/RFC 4/4] sh-sci: Derive regshift value from DT compatible value Geert Uytterhoeven 2018-08-06 14:07 ` Geert Uytterhoeven 2018-08-06 14:18 ` Chris Brandt 2018-08-06 14:18 ` Chris Brandt 2018-08-06 14:38 ` Geert Uytterhoeven 2018-08-06 14:38 ` Geert Uytterhoeven 2018-08-06 16:10 ` Chris Brandt 2018-08-06 16:10 ` Chris Brandt 2018-08-07 19:24 ` Chris Brandt 2018-08-07 19:24 ` Chris Brandt 2018-08-07 19:37 ` Geert Uytterhoeven 2018-08-07 19:37 ` Geert Uytterhoeven 2018-08-07 21:10 ` Chris Brandt 2018-08-07 21:10 ` Chris Brandt 2018-08-08 0:16 ` Chris Brandt 2018-08-08 0:16 ` Chris Brandt 2018-08-08 10:11 ` Geert Uytterhoeven 2018-08-08 10:11 ` Geert Uytterhoeven 2018-08-08 10:39 ` Chris Brandt 2018-08-08 10:39 ` Chris Brandt 2018-08-08 11:05 ` Geert Uytterhoeven 2018-08-08 11:05 ` Geert Uytterhoeven 2018-08-06 14:37 ` [PATCH/RFC 0/4] sh-sci : Do not derive regshift from regsize Laurent Pinchart 2018-08-06 14:37 ` Laurent Pinchart 2018-08-06 14:41 ` Laurent Pinchart 2018-08-06 14:41 ` Laurent Pinchart 2018-08-06 14:41 ` Geert Uytterhoeven 2018-08-06 14:41 ` Geert Uytterhoeven 2018-08-08 11:02 ` Geert Uytterhoeven 2018-08-08 11:02 ` Geert Uytterhoeven 2018-08-08 11:32 ` Chris Brandt 2018-08-08 11:32 ` Chris Brandt 2018-08-08 20:46 ` Chris Brandt 2018-08-08 20:46 ` Chris Brandt
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