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serial: 8250: Use C99 array initializer & define UART_REG_UNMAPPED 

Use C99 array initializer insteads of comments and make unmapped checks
more obvious.

Reviewed-by: Jiri Slaby <jirislaby@kernel.org>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20220624205424.12686-5-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilpo Järvinen 2022-06-24 23:54:22 +03:00 committed by Greg Kroah-Hartman
parent e23ee9d2c4
commit 27a1c39215
1 changed files with 20 additions and 18 deletions
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38
drivers/tty/serial/8250/8250_port.c
View File

@ -336,27 +336,29 @@ static void default_serial_dl_write(struct uart_8250_port *up, int value)
#ifdef CONFIG_SERIAL_8250_RT288X
#define UART_REG_UNMAPPED -1
/* Au1x00/RT288x UART hardware has a weird register layout */
static const s8 au_io_in_map[8] = {
0, /* UART_RX */
2, /* UART_IER */
3, /* UART_IIR */
5, /* UART_LCR */
6, /* UART_MCR */
7, /* UART_LSR */
8, /* UART_MSR */
-1, /* UART_SCR (unmapped) */
[UART_RX] = 0,
[UART_IER] = 2,
[UART_IIR] = 3,
[UART_LCR] = 5,
[UART_MCR] = 6,
[UART_LSR] = 7,
[UART_MSR] = 8,
[UART_SCR] = UART_REG_UNMAPPED,
};
static const s8 au_io_out_map[8] = {
1, /* UART_TX */
2, /* UART_IER */
4, /* UART_FCR */
5, /* UART_LCR */
6, /* UART_MCR */
-1, /* UART_LSR (unmapped) */
-1, /* UART_MSR (unmapped) */
-1, /* UART_SCR (unmapped) */
[UART_TX] = 1,
[UART_IER] = 2,
[UART_FCR] = 4,
[UART_LCR] = 5,
[UART_MCR] = 6,
[UART_LSR] = UART_REG_UNMAPPED,
[UART_MSR] = UART_REG_UNMAPPED,
[UART_SCR] = UART_REG_UNMAPPED,
};
unsigned int au_serial_in(struct uart_port *p, int offset)
@ -364,7 +366,7 @@ unsigned int au_serial_in(struct uart_port *p, int offset)
if (offset >= ARRAY_SIZE(au_io_in_map))
return UINT_MAX;
offset = au_io_in_map[offset];
if (offset < 0)
if (offset == UART_REG_UNMAPPED)
return UINT_MAX;
return __raw_readl(p->membase + (offset << p->regshift));
}
@ -374,7 +376,7 @@ void au_serial_out(struct uart_port *p, int offset, int value)
if (offset >= ARRAY_SIZE(au_io_out_map))
return;
offset = au_io_out_map[offset];
if (offset < 0)
if (offset == UART_REG_UNMAPPED)
return;
__raw_writel(value, p->membase + (offset << p->regshift));
}