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tty: serial: samsung_tty: Separate S3C64XX ops structure 

Instead of patching a single global ops structure depending on the port
type, use a separate s3c64xx_serial_ops for the S3C64XX type. This
allows us to mark the structures as const.

Also split out s3c64xx_serial_shutdown into a separate function now that
we have a separate ops structure; this avoids excessive branching
control flow and mirrors s3c64xx_serial_startup. tx_claimed and
rx_claimed are only used in the S3C24XX functions.

Signed-off-by: Hector Martin <marcan@marcan.st>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Tested-by: Krzysztof Kozlowski <krzysztof.kozlowski@canonical.com>
Link: https://lore.kernel.org/r/20210304213902.83903-19-marcan@marcan.st
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Hector Martin 2021-03-05 06:38:53 +09:00 committed by Greg Kroah-Hartman
parent 19d48787e3
commit 6468916383
1 changed files with 54 additions and 17 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

71
drivers/tty/serial/samsung_tty.c
View File

@ -1099,27 +1099,36 @@ static void s3c24xx_serial_shutdown(struct uart_port *port)
struct s3c24xx_uart_port *ourport = to_ourport(port);
if (ourport->tx_claimed) {
if (!s3c24xx_serial_has_interrupt_mask(port))
free_irq(ourport->tx_irq, ourport);
free_irq(ourport->tx_irq, ourport);
ourport->tx_enabled = 0;
ourport->tx_claimed = 0;
ourport->tx_mode = 0;
}
if (ourport->rx_claimed) {
if (!s3c24xx_serial_has_interrupt_mask(port))
free_irq(ourport->rx_irq, ourport);
free_irq(ourport->rx_irq, ourport);
ourport->rx_claimed = 0;
ourport->rx_enabled = 0;
}
/* Clear pending interrupts and mask all interrupts */
if (s3c24xx_serial_has_interrupt_mask(port)) {
free_irq(port->irq, ourport);
if (ourport->dma)
s3c24xx_serial_release_dma(ourport);
wr_regl(port, S3C64XX_UINTP, 0xf);
wr_regl(port, S3C64XX_UINTM, 0xf);
}
ourport->tx_in_progress = 0;
}
static void s3c64xx_serial_shutdown(struct uart_port *port)
{
struct s3c24xx_uart_port *ourport = to_ourport(port);
ourport->tx_enabled = 0;
ourport->tx_mode = 0;
ourport->rx_enabled = 0;
free_irq(port->irq, ourport);
wr_regl(port, S3C64XX_UINTP, 0xf);
wr_regl(port, S3C64XX_UINTM, 0xf);
if (ourport->dma)
s3c24xx_serial_release_dma(ourport);
@ -1194,9 +1203,7 @@ static int s3c64xx_serial_startup(struct uart_port *port)
/* For compatibility with s3c24xx Soc's */
ourport->rx_enabled = 1;
ourport->rx_claimed = 1;
ourport->tx_enabled = 0;
ourport->tx_claimed = 1;
spin_lock_irqsave(&port->lock, flags);
@ -1609,7 +1616,7 @@ static void s3c24xx_serial_put_poll_char(struct uart_port *port,
unsigned char c);
#endif
static struct uart_ops s3c24xx_serial_ops = {
static const struct uart_ops s3c24xx_serial_ops = {
.pm = s3c24xx_serial_pm,
.tx_empty = s3c24xx_serial_tx_empty,
.get_mctrl = s3c24xx_serial_get_mctrl,
@ -1632,6 +1639,29 @@ static struct uart_ops s3c24xx_serial_ops = {
#endif
};
static const struct uart_ops s3c64xx_serial_ops = {
.pm = s3c24xx_serial_pm,
.tx_empty = s3c24xx_serial_tx_empty,
.get_mctrl = s3c24xx_serial_get_mctrl,
.set_mctrl = s3c24xx_serial_set_mctrl,
.stop_tx = s3c24xx_serial_stop_tx,
.start_tx = s3c24xx_serial_start_tx,
.stop_rx = s3c24xx_serial_stop_rx,
.break_ctl = s3c24xx_serial_break_ctl,
.startup = s3c64xx_serial_startup,
.shutdown = s3c64xx_serial_shutdown,
.set_termios = s3c24xx_serial_set_termios,
.type = s3c24xx_serial_type,
.release_port = s3c24xx_serial_release_port,
.request_port = s3c24xx_serial_request_port,
.config_port = s3c24xx_serial_config_port,
.verify_port = s3c24xx_serial_verify_port,
#if defined(CONFIG_SERIAL_SAMSUNG_CONSOLE) && defined(CONFIG_CONSOLE_POLL)
.poll_get_char = s3c24xx_serial_get_poll_char,
.poll_put_char = s3c24xx_serial_put_poll_char,
#endif
};
static struct uart_driver s3c24xx_uart_drv = {
.owner = THIS_MODULE,
.driver_name = "s3c2410_serial",
@ -1864,10 +1894,6 @@ static int s3c24xx_serial_init_port(struct s3c24xx_uart_port *ourport,
/* setup info for port */
port->dev = &platdev->dev;
/* Startup sequence is different for s3c64xx and higher SoC's */
if (s3c24xx_serial_has_interrupt_mask(port))
s3c24xx_serial_ops.startup = s3c64xx_serial_startup;
port->uartclk = 1;
if (cfg->uart_flags & UPF_CONS_FLOW) {
@ -2015,6 +2041,17 @@ static int s3c24xx_serial_probe(struct platform_device *pdev)
dev_get_platdata(&pdev->dev) :
ourport->drv_data->def_cfg;
switch (ourport->info->type) {
case PORT_S3C2410:
case PORT_S3C2412:
case PORT_S3C2440:
ourport->port.ops = &s3c24xx_serial_ops;
break;
case PORT_S3C6400:
ourport->port.ops = &s3c64xx_serial_ops;
break;
}
if (np) {
of_property_read_u32(np,
"samsung,uart-fifosize", &ourport->port.fifosize);