diff mbox series

[4/6] tty/serial: Add RISC-V SBI debug console based earlycon

Message ID 20231010170503.657189-5-apatel@ventanamicro.com
State New
Headers
Series RISC-V SBI debug console extension support |

Commit Message

Anup Patel Oct. 10, 2023, 5:05 p.m. UTC 
  We extend the existing RISC-V SBI earlycon support to use the new
RISC-V SBI debug console extension.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
---
 drivers/tty/serial/Kconfig              |  2 +-
 drivers/tty/serial/earlycon-riscv-sbi.c | 35 ++++++++++++++++++++++---
 2 files changed, 32 insertions(+), 5 deletions(-)

Comments

Greg KH Oct. 10, 2023, 5:16 p.m. UTC | #1 
On Tue, Oct 10, 2023 at 10:35:01PM +0530, Anup Patel wrote:
> We extend the existing RISC-V SBI earlycon support to use the new
> RISC-V SBI debug console extension.
> 
> Signed-off-by: Anup Patel <apatel@ventanamicro.com>
> ---
>  drivers/tty/serial/Kconfig              |  2 +-
>  drivers/tty/serial/earlycon-riscv-sbi.c | 35 ++++++++++++++++++++++---
>  2 files changed, 32 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> index bdc568a4ab66..cec46091a716 100644
> --- a/drivers/tty/serial/Kconfig
> +++ b/drivers/tty/serial/Kconfig
> @@ -87,7 +87,7 @@ config SERIAL_EARLYCON_SEMIHOST
>  
>  config SERIAL_EARLYCON_RISCV_SBI
>  	bool "Early console using RISC-V SBI"
> -	depends on RISCV_SBI_V01
> +	depends on RISCV_SBI
>  	select SERIAL_CORE
>  	select SERIAL_CORE_CONSOLE
>  	select SERIAL_EARLYCON
> diff --git a/drivers/tty/serial/earlycon-riscv-sbi.c b/drivers/tty/serial/earlycon-riscv-sbi.c
> index 27afb0b74ea7..b1da34e8d8cd 100644
> --- a/drivers/tty/serial/earlycon-riscv-sbi.c
> +++ b/drivers/tty/serial/earlycon-riscv-sbi.c
> @@ -10,22 +10,49 @@
>  #include <linux/serial_core.h>
>  #include <asm/sbi.h>
>  
> +#ifdef CONFIG_RISCV_SBI_V01
>  static void sbi_putc(struct uart_port *port, unsigned char c)
>  {
>  	sbi_console_putchar(c);
>  }
>  
> -static void sbi_console_write(struct console *con,
> -			      const char *s, unsigned n)
> +static void sbi_0_1_console_write(struct console *con,
> +				  const char *s, unsigned int n)
>  {
>  	struct earlycon_device *dev = con->data;
>  	uart_console_write(&dev->port, s, n, sbi_putc);
>  }
> +#endif
> +
> +static void sbi_dbcn_console_write(struct console *con,
> +				   const char *s, unsigned int n)
> +{
> +	phys_addr_t pa = __pa(s);
> +
> +	sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_WRITE,
> +#ifdef CONFIG_32BIT
> +		  n, pa, (u64)pa >> 32,
> +#else
> +		  n, pa, 0,
> +#endif

Again, no #ifdef in .c files please.

thanks,

greg k-h
Anup Patel Oct. 11, 2023, 5:52 a.m. UTC | #2 
On Tue, Oct 10, 2023 at 10:46 PM Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
>
> On Tue, Oct 10, 2023 at 10:35:01PM +0530, Anup Patel wrote:
> > We extend the existing RISC-V SBI earlycon support to use the new
> > RISC-V SBI debug console extension.
> >
> > Signed-off-by: Anup Patel <apatel@ventanamicro.com>
> > ---
> >  drivers/tty/serial/Kconfig              |  2 +-
> >  drivers/tty/serial/earlycon-riscv-sbi.c | 35 ++++++++++++++++++++++---
> >  2 files changed, 32 insertions(+), 5 deletions(-)
> >
> > diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
> > index bdc568a4ab66..cec46091a716 100644
> > --- a/drivers/tty/serial/Kconfig
> > +++ b/drivers/tty/serial/Kconfig
> > @@ -87,7 +87,7 @@ config SERIAL_EARLYCON_SEMIHOST
> >
> >  config SERIAL_EARLYCON_RISCV_SBI
> >       bool "Early console using RISC-V SBI"
> > -     depends on RISCV_SBI_V01
> > +     depends on RISCV_SBI
> >       select SERIAL_CORE
> >       select SERIAL_CORE_CONSOLE
> >       select SERIAL_EARLYCON
> > diff --git a/drivers/tty/serial/earlycon-riscv-sbi.c b/drivers/tty/serial/earlycon-riscv-sbi.c
> > index 27afb0b74ea7..b1da34e8d8cd 100644
> > --- a/drivers/tty/serial/earlycon-riscv-sbi.c
> > +++ b/drivers/tty/serial/earlycon-riscv-sbi.c
> > @@ -10,22 +10,49 @@
> >  #include <linux/serial_core.h>
> >  #include <asm/sbi.h>
> >
> > +#ifdef CONFIG_RISCV_SBI_V01
> >  static void sbi_putc(struct uart_port *port, unsigned char c)
> >  {
> >       sbi_console_putchar(c);
> >  }
> >
> > -static void sbi_console_write(struct console *con,
> > -                           const char *s, unsigned n)
> > +static void sbi_0_1_console_write(struct console *con,
> > +                               const char *s, unsigned int n)
> >  {
> >       struct earlycon_device *dev = con->data;
> >       uart_console_write(&dev->port, s, n, sbi_putc);
> >  }
> > +#endif
> > +
> > +static void sbi_dbcn_console_write(struct console *con,
> > +                                const char *s, unsigned int n)
> > +{
> > +     phys_addr_t pa = __pa(s);
> > +
> > +     sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_WRITE,
> > +#ifdef CONFIG_32BIT
> > +               n, pa, (u64)pa >> 32,
> > +#else
> > +               n, pa, 0,
> > +#endif
>
> Again, no #ifdef in .c files please.

Okay, I will remove #ifdef from here as well.

>
> thanks,
>
> greg k-h

Thanks,
Anup
diff mbox series

Patch

diff --git a/drivers/tty/serial/Kconfig b/drivers/tty/serial/Kconfig
index bdc568a4ab66..cec46091a716 100644
--- a/drivers/tty/serial/Kconfig
+++ b/drivers/tty/serial/Kconfig
@@ -87,7 +87,7 @@  config SERIAL_EARLYCON_SEMIHOST
 
 config SERIAL_EARLYCON_RISCV_SBI
 	bool "Early console using RISC-V SBI"
-	depends on RISCV_SBI_V01
+	depends on RISCV_SBI
 	select SERIAL_CORE
 	select SERIAL_CORE_CONSOLE
 	select SERIAL_EARLYCON
diff --git a/drivers/tty/serial/earlycon-riscv-sbi.c b/drivers/tty/serial/earlycon-riscv-sbi.c
index 27afb0b74ea7..b1da34e8d8cd 100644
--- a/drivers/tty/serial/earlycon-riscv-sbi.c
+++ b/drivers/tty/serial/earlycon-riscv-sbi.c
@@ -10,22 +10,49 @@ 
 #include <linux/serial_core.h>
 #include <asm/sbi.h>
 
+#ifdef CONFIG_RISCV_SBI_V01
 static void sbi_putc(struct uart_port *port, unsigned char c)
 {
 	sbi_console_putchar(c);
 }
 
-static void sbi_console_write(struct console *con,
-			      const char *s, unsigned n)
+static void sbi_0_1_console_write(struct console *con,
+				  const char *s, unsigned int n)
 {
 	struct earlycon_device *dev = con->data;
 	uart_console_write(&dev->port, s, n, sbi_putc);
 }
+#endif
+
+static void sbi_dbcn_console_write(struct console *con,
+				   const char *s, unsigned int n)
+{
+	phys_addr_t pa = __pa(s);
+
+	sbi_ecall(SBI_EXT_DBCN, SBI_EXT_DBCN_CONSOLE_WRITE,
+#ifdef CONFIG_32BIT
+		  n, pa, (u64)pa >> 32,
+#else
+		  n, pa, 0,
+#endif
+		  0, 0, 0);
+}
 
 static int __init early_sbi_setup(struct earlycon_device *device,
 				  const char *opt)
 {
-	device->con->write = sbi_console_write;
-	return 0;
+	int ret = 0;
+
+	if ((sbi_spec_version >= sbi_mk_version(2, 0)) &&
+	    (sbi_probe_extension(SBI_EXT_DBCN) > 0))
+		device->con->write = sbi_dbcn_console_write;
+	else
+#ifdef CONFIG_RISCV_SBI_V01
+		device->con->write = sbi_0_1_console_write;
+#else
+		ret = -ENODEV;
+#endif
+
+	return ret;
 }
 EARLYCON_DECLARE(sbi, early_sbi_setup);