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Subject[PATCH v3 4/6] serial: 8250: Use C99 array initializer & define UART_REG_UNMAPPED
Date
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>
---
drivers/tty/serial/8250/8250_port.c | 38 +++++++++++++++--------------
1 file changed, 20 insertions(+), 18 deletions(-)

diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 953b0fadfd4c..432742a567b6 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -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));
}
--
2.30.2
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