From: Ilpo Järvinen Date: Thu, 11 May 2023 12:10:24 +0000 (+0300) Subject: serial: 8250: Change dl_read/write to handle value as u32 X-Git-Tag: v6.6.7~2447^2~52 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b245aa0cc583c3efa0335c50f309a32e5fec8ab7;p=platform%2Fkernel%2Flinux-starfive.git serial: 8250: Change dl_read/write to handle value as u32 Divisor latch read/write functions currently handle the value is int. As the value is related to HW context, u32 makes much more sense than a signed type. While at it, name the parameters in the callback signature. Signed-off-by: Ilpo Järvinen Link: https://lore.kernel.org/r/20230511121029.13128-2-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h index 1e8fe44..5418708 100644 --- a/drivers/tty/serial/8250/8250.h +++ b/drivers/tty/serial/8250/8250.h @@ -167,12 +167,12 @@ static unsigned int __maybe_unused serial_icr_read(struct uart_8250_port *up, void serial8250_clear_and_reinit_fifos(struct uart_8250_port *p); -static inline int serial_dl_read(struct uart_8250_port *up) +static inline u32 serial_dl_read(struct uart_8250_port *up) { return up->dl_read(up); } -static inline void serial_dl_write(struct uart_8250_port *up, int value) +static inline void serial_dl_write(struct uart_8250_port *up, u32 value) { up->dl_write(up, value); } diff --git a/drivers/tty/serial/8250/8250_em.c b/drivers/tty/serial/8250/8250_em.c index 25a9ecf..ef5019e 100644 --- a/drivers/tty/serial/8250/8250_em.c +++ b/drivers/tty/serial/8250/8250_em.c @@ -139,12 +139,12 @@ static void serial8250_em_serial_out(struct uart_port *p, int offset, int value) } } -static int serial8250_em_serial_dl_read(struct uart_8250_port *up) +static u32 serial8250_em_serial_dl_read(struct uart_8250_port *up) { return serial_in(up, UART_DLL_EM) | serial_in(up, UART_DLM_EM) << 8; } -static void serial8250_em_serial_dl_write(struct uart_8250_port *up, int value) +static void serial8250_em_serial_dl_write(struct uart_8250_port *up, u32 value) { serial_out(up, UART_DLL_EM, value & 0xff); serial_out(up, UART_DLM_EM, value >> 8 & 0xff); diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index fe8d79c..344bd44 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -325,7 +325,7 @@ static const struct serial8250_config uart_config[] = { }; /* Uart divisor latch read */ -static int default_serial_dl_read(struct uart_8250_port *up) +static u32 default_serial_dl_read(struct uart_8250_port *up) { /* Assign these in pieces to truncate any bits above 7. */ unsigned char dll = serial_in(up, UART_DLL); @@ -335,7 +335,7 @@ static int default_serial_dl_read(struct uart_8250_port *up) } /* Uart divisor latch write */ -static void default_serial_dl_write(struct uart_8250_port *up, int value) +static void default_serial_dl_write(struct uart_8250_port *up, u32 value) { serial_out(up, UART_DLL, value & 0xff); serial_out(up, UART_DLM, value >> 8 & 0xff); @@ -389,12 +389,12 @@ void au_serial_out(struct uart_port *p, int offset, int value) } /* Au1x00 haven't got a standard divisor latch */ -static int au_serial_dl_read(struct uart_8250_port *up) +static u32 au_serial_dl_read(struct uart_8250_port *up) { return __raw_readl(up->port.membase + 0x28); } -static void au_serial_dl_write(struct uart_8250_port *up, int value) +static void au_serial_dl_write(struct uart_8250_port *up, u32 value) { __raw_writel(value, up->port.membase + 0x28); } @@ -847,7 +847,7 @@ static void disable_rsa(struct uart_8250_port *up) static int size_fifo(struct uart_8250_port *up) { unsigned char old_fcr, old_mcr, old_lcr; - unsigned short old_dl; + u32 old_dl; int count; old_lcr = serial_in(up, UART_LCR); diff --git a/drivers/tty/serial/8250/8250_pxa.c b/drivers/tty/serial/8250/8250_pxa.c index 795e551..28b341f 100644 --- a/drivers/tty/serial/8250/8250_pxa.c +++ b/drivers/tty/serial/8250/8250_pxa.c @@ -60,7 +60,7 @@ static const struct of_device_id serial_pxa_dt_ids[] = { MODULE_DEVICE_TABLE(of, serial_pxa_dt_ids); /* Uart divisor latch write */ -static void serial_pxa_dl_write(struct uart_8250_port *up, int value) +static void serial_pxa_dl_write(struct uart_8250_port *up, u32 value) { unsigned int dll; diff --git a/drivers/tty/serial/8250/8250_uniphier.c b/drivers/tty/serial/8250/8250_uniphier.c index a2978ab..a405155 100644 --- a/drivers/tty/serial/8250/8250_uniphier.c +++ b/drivers/tty/serial/8250/8250_uniphier.c @@ -145,12 +145,12 @@ static void uniphier_serial_out(struct uart_port *p, int offset, int value) * The divisor latch register exists at different address. * Override dl_read/write callbacks. */ -static int uniphier_serial_dl_read(struct uart_8250_port *up) +static u32 uniphier_serial_dl_read(struct uart_8250_port *up) { return readl(up->port.membase + UNIPHIER_UART_DLR); } -static void uniphier_serial_dl_write(struct uart_8250_port *up, int value) +static void uniphier_serial_dl_write(struct uart_8250_port *up, u32 value) { writel(value, up->port.membase + UNIPHIER_UART_DLR); } diff --git a/include/linux/serial_8250.h b/include/linux/serial_8250.h index 6f78f30..7b5d558 100644 --- a/include/linux/serial_8250.h +++ b/include/linux/serial_8250.h @@ -129,8 +129,8 @@ struct uart_8250_port { const struct uart_8250_ops *ops; /* 8250 specific callbacks */ - int (*dl_read)(struct uart_8250_port *); - void (*dl_write)(struct uart_8250_port *, int); + u32 (*dl_read)(struct uart_8250_port *up); + void (*dl_write)(struct uart_8250_port *up, u32 value); struct uart_8250_em485 *em485; void (*rs485_start_tx)(struct uart_8250_port *);