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serial: 8250_rt288x: Remove unnecessary UART_REG_UNMAPPED

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As unmapped registers are at the tail of the array, the ARRAY_SIZE()
condition will catch them just fine. No need to define special
value for them.

Convert the arrays to u8 as all entiries are now positive.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20230511121029.13128-7-ilpo.jarvinen@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ilpo Järvinen 2023-05-11 15:10:29 +03:00 committed by Greg Kroah-Hartman
parent 33e3b0eb75
commit 72fc578b22
1 changed files with 4 additions and 12 deletions
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16
drivers/tty/serial/8250/8250_rt288x.c
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@ -14,10 +14,8 @@
#define RT288X_DL 0x28
#define UART_REG_UNMAPPED -1
/* Au1x00/RT288x UART hardware has a weird register layout */
static const s8 au_io_in_map[8] = {
static const u8 au_io_in_map[7] = {
[UART_RX] = 0,
[UART_IER] = 2,
[UART_IIR] = 3,
@ -25,18 +23,14 @@ static const s8 au_io_in_map[8] = {
[UART_MCR] = 6,
[UART_LSR] = 7,
[UART_MSR] = 8,
[UART_SCR] = UART_REG_UNMAPPED,
};
static const s8 au_io_out_map[8] = {
static const u8 au_io_out_map[5] = {
[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,
};
static unsigned int au_serial_in(struct uart_port *p, int offset)
@ -44,8 +38,7 @@ static 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 == UART_REG_UNMAPPED)
return UINT_MAX;
return __raw_readl(p->membase + (offset << p->regshift));
}
@ -54,8 +47,7 @@ static 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 == UART_REG_UNMAPPED)
return;
__raw_writel(value, p->membase + (offset << p->regshift));
}