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serial: 8250: move RSA functions to 8250_rsa.c

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They are RSA-specific, so should live in a preexisting 8250_rsa.c. Move
them there.

Signed-off-by: "Jiri Slaby (SUSE)" <jirislaby@kernel.org>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20250611100319.186924-13-jirislaby@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Jiri Slaby (SUSE) 2025-06-11 12:02:58 +02:00 • committed by Greg Kroah-Hartman
parent 8725679fc4
commit 5a128fb475
3 changed files with 100 additions and 99 deletions
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8
drivers/tty/serial/8250/8250.h
View file

@ -318,8 +318,16 @@ static inline void serial8250_pnp_exit(void) { }
#ifdef CONFIG_SERIAL_8250_RSA
void univ8250_rsa_support(struct uart_ops *ops);
void rsa_enable(struct uart_8250_port *up);
void rsa_disable(struct uart_8250_port *up);
void rsa_autoconfig(struct uart_8250_port *up);
void rsa_reset(struct uart_8250_port *up);
#else
static inline void univ8250_rsa_support(struct uart_ops *ops) { }
static inline void rsa_enable(struct uart_8250_port *up) {}
static inline void rsa_disable(struct uart_8250_port *up) {}
static inline void rsa_autoconfig(struct uart_8250_port *up) {}
static inline void rsa_reset(struct uart_8250_port *up) {}
#endif
#ifdef CONFIG_SERIAL_8250_FINTEK

99
drivers/tty/serial/8250/8250_port.c
View file

@ -713,105 +713,6 @@ static void serial8250_clear_IER(struct uart_8250_port *up)
serial_out(up, UART_IER, 0);
}
#ifdef CONFIG_SERIAL_8250_RSA
/*
* Attempts to turn on the RSA FIFO. Returns zero on failure.
* We set the port uart clock rate if we succeed.
*/
static int __rsa_enable(struct uart_8250_port *up)
{
unsigned char mode;
int result;
mode = serial_in(up, UART_RSA_MSR);
result = mode & UART_RSA_MSR_FIFO;
if (!result) {
serial_out(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
mode = serial_in(up, UART_RSA_MSR);
result = mode & UART_RSA_MSR_FIFO;
}
if (result)
up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;
return result;
}
/*
* If this is an RSA port, see if we can kick it up to the higher speed clock.
*/
static void rsa_enable(struct uart_8250_port *up)
{
if (up->port.type != PORT_RSA)
return;
if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
uart_port_lock_irq(&up->port);
__rsa_enable(up);
uart_port_unlock_irq(&up->port);
}
if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
serial_out(up, UART_RSA_FRR, 0);
}
/*
* Attempts to turn off the RSA FIFO and resets the RSA board back to 115kbps compat mode. It is
* unknown why interrupts were disabled in here. However, the caller is expected to preserve this
* behaviour by grabbing the spinlock before calling this function.
*/
static void rsa_disable(struct uart_8250_port *up)
{
unsigned char mode;
int result;
if (up->port.type != PORT_RSA)
return;
if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16)
return;
uart_port_lock_irq(&up->port);
mode = serial_in(up, UART_RSA_MSR);
result = !(mode & UART_RSA_MSR_FIFO);
if (!result) {
serial_out(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
mode = serial_in(up, UART_RSA_MSR);
result = !(mode & UART_RSA_MSR_FIFO);
}
if (result)
up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
uart_port_unlock_irq(&up->port);
}
static void rsa_autoconfig(struct uart_8250_port *up)
{
/* Only probe for RSA ports if we got the region. */
if (up->port.type != PORT_16550A)
return;
if (!(up->probe & UART_PROBE_RSA))
return;
if (__rsa_enable(up))
up->port.type = PORT_RSA;
}
static void rsa_reset(struct uart_8250_port *up)
{
if (up->port.type != PORT_RSA)
return;
serial_out(up, UART_RSA_FRR, 0);
}
#else
static inline void rsa_enable(struct uart_8250_port *up) {}
static inline void rsa_disable(struct uart_8250_port *up) {}
static inline void rsa_autoconfig(struct uart_8250_port *up) {}
static inline void rsa_reset(struct uart_8250_port *up) {}
#endif /* CONFIG_SERIAL_8250_RSA */
/*
* This is a quickie test to see how big the FIFO is.
* It doesn't work at all the time, more's the pity.

92
drivers/tty/serial/8250/8250_rsa.c
View file

@ -107,6 +107,98 @@ void univ8250_rsa_support(struct uart_ops *ops)
module_param_hw_array(probe_rsa, ulong, ioport, &probe_rsa_count, 0444);
MODULE_PARM_DESC(probe_rsa, "Probe I/O ports for RSA");
/*
* Attempts to turn on the RSA FIFO. Returns zero on failure.
* We set the port uart clock rate if we succeed.
*/
static int __rsa_enable(struct uart_8250_port *up)
{
unsigned char mode;
int result;
mode = serial_in(up, UART_RSA_MSR);
result = mode & UART_RSA_MSR_FIFO;
if (!result) {
serial_out(up, UART_RSA_MSR, mode | UART_RSA_MSR_FIFO);
mode = serial_in(up, UART_RSA_MSR);
result = mode & UART_RSA_MSR_FIFO;
}
if (result)
up->port.uartclk = SERIAL_RSA_BAUD_BASE * 16;
return result;
}
/*
* If this is an RSA port, see if we can kick it up to the higher speed clock.
*/
void rsa_enable(struct uart_8250_port *up)
{
if (up->port.type != PORT_RSA)
return;
if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16) {
uart_port_lock_irq(&up->port);
__rsa_enable(up);
uart_port_unlock_irq(&up->port);
}
if (up->port.uartclk == SERIAL_RSA_BAUD_BASE * 16)
serial_out(up, UART_RSA_FRR, 0);
}
/*
* Attempts to turn off the RSA FIFO and resets the RSA board back to 115kbps compat mode. It is
* unknown why interrupts were disabled in here. However, the caller is expected to preserve this
* behaviour by grabbing the spinlock before calling this function.
*/
void rsa_disable(struct uart_8250_port *up)
{
unsigned char mode;
int result;
if (up->port.type != PORT_RSA)
return;
if (up->port.uartclk != SERIAL_RSA_BAUD_BASE * 16)
return;
uart_port_lock_irq(&up->port);
mode = serial_in(up, UART_RSA_MSR);
result = !(mode & UART_RSA_MSR_FIFO);
if (!result) {
serial_out(up, UART_RSA_MSR, mode & ~UART_RSA_MSR_FIFO);
mode = serial_in(up, UART_RSA_MSR);
result = !(mode & UART_RSA_MSR_FIFO);
}
if (result)
up->port.uartclk = SERIAL_RSA_BAUD_BASE_LO * 16;
uart_port_unlock_irq(&up->port);
}
void rsa_autoconfig(struct uart_8250_port *up)
{
/* Only probe for RSA ports if we got the region. */
if (up->port.type != PORT_16550A)
return;
if (!(up->probe & UART_PROBE_RSA))
return;
if (__rsa_enable(up))
up->port.type = PORT_RSA;
}
void rsa_reset(struct uart_8250_port *up)
{
if (up->port.type != PORT_RSA)
return;
serial_out(up, UART_RSA_FRR, 0);
}
#ifdef CONFIG_SERIAL_8250_DEPRECATED_OPTIONS
#ifndef MODULE
/*