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serial: sprd: Use readable macros instead of magic number

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Define readable macros instead of magic number to make code more readable.

Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Acked-by: Chunyan Zhang <chunyan.zhang@spreadtrum.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Baolin Wang 2018-09-17 11:33:41 -07:00 committed by Greg Kroah-Hartman
parent 20464f3a9b
commit 2b5a997386
1 changed files with 17 additions and 8 deletions
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25
drivers/tty/serial/sprd_serial.c
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@ -45,6 +45,8 @@
/* data number in TX and RX fifo */
#define SPRD_STS1 0x000C
#define SPRD_RX_FIFO_CNT_MASK GENMASK(7, 0)
#define SPRD_TX_FIFO_CNT_MASK GENMASK(15, 8)
/* interrupt enable register and its BITs */
#define SPRD_IEN 0x0010
@ -82,11 +84,15 @@
/* fifo threshold register */
#define SPRD_CTL2 0x0020
#define THLD_TX_EMPTY 0x40
#define THLD_TX_EMPTY_SHIFT 8
#define THLD_RX_FULL 0x40
/* config baud rate register */
#define SPRD_CLKD0 0x0024
#define SPRD_CLKD0_MASK GENMASK(15, 0)
#define SPRD_CLKD1 0x0028
#define SPRD_CLKD1_MASK GENMASK(20, 16)
#define SPRD_CLKD1_SHIFT 16
/* interrupt mask status register */
#define SPRD_IMSR 0x002C
@ -115,7 +121,7 @@ static inline void serial_out(struct uart_port *port, int offset, int value)
static unsigned int sprd_tx_empty(struct uart_port *port)
{
if (serial_in(port, SPRD_STS1) & 0xff00)
if (serial_in(port, SPRD_STS1) & SPRD_TX_FIFO_CNT_MASK)
return 0;
else
return TIOCSER_TEMT;
@ -213,7 +219,8 @@ static inline void sprd_rx(struct uart_port *port)
struct tty_port *tty = &port->state->port;
unsigned int ch, flag, lsr, max_count = SPRD_TIMEOUT;
while ((serial_in(port, SPRD_STS1) & 0x00ff) && max_count--) {
while ((serial_in(port, SPRD_STS1) & SPRD_RX_FIFO_CNT_MASK) &&
max_count--) {
lsr = serial_in(port, SPRD_LSR);
ch = serial_in(port, SPRD_RXD);
flag = TTY_NORMAL;
@ -303,16 +310,17 @@ static int sprd_startup(struct uart_port *port)
struct sprd_uart_port *sp;
unsigned long flags;
serial_out(port, SPRD_CTL2, ((THLD_TX_EMPTY << 8) | THLD_RX_FULL));
serial_out(port, SPRD_CTL2,
THLD_TX_EMPTY << THLD_TX_EMPTY_SHIFT | THLD_RX_FULL);
/* clear rx fifo */
timeout = SPRD_TIMEOUT;
while (timeout-- && serial_in(port, SPRD_STS1) & 0x00ff)
while (timeout-- && serial_in(port, SPRD_STS1) & SPRD_RX_FIFO_CNT_MASK)
serial_in(port, SPRD_RXD);
/* clear tx fifo */
timeout = SPRD_TIMEOUT;
while (timeout-- && serial_in(port, SPRD_STS1) & 0xff00)
while (timeout-- && serial_in(port, SPRD_STS1) & SPRD_TX_FIFO_CNT_MASK)
cpu_relax();
/* clear interrupt */
@ -433,10 +441,11 @@ static void sprd_set_termios(struct uart_port *port,
}
/* clock divider bit0~bit15 */
serial_out(port, SPRD_CLKD0, quot & 0xffff);
serial_out(port, SPRD_CLKD0, quot & SPRD_CLKD0_MASK);
/* clock divider bit16~bit20 */
serial_out(port, SPRD_CLKD1, (quot & 0x1f0000) >> 16);
serial_out(port, SPRD_CLKD1,
(quot & SPRD_CLKD1_MASK) >> SPRD_CLKD1_SHIFT);
serial_out(port, SPRD_LCR, lcr);
fc |= RX_TOUT_THLD_DEF | RX_HFC_THLD_DEF;
serial_out(port, SPRD_CTL1, fc);
@ -510,7 +519,7 @@ static void wait_for_xmitr(struct uart_port *port)
if (--tmout == 0)
break;
udelay(1);
} while (status & 0xff00);
} while (status & SPRD_TX_FIFO_CNT_MASK);
}
static void sprd_console_putchar(struct uart_port *port, int ch)