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@xxxxxxxxxxxxxxx>
---
drivers/tty/serial/8250/8250_rt288x.c | 16 ++++------------
1 file changed, 4 insertions(+), 12 deletions(-)
diff --git a/drivers/tty/serial/8250/8250_rt288x.c b/drivers/tty/serial/8250/8250_rt288x.c
index b091a1269bfa..6415ca8d3adf 100644
--- a/drivers/tty/serial/8250/8250_rt288x.c
+++ b/drivers/tty/serial/8250/8250_rt288x.c
@@ -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));
}
--
2.30.2
