From 2b5a997386b0594e671a32c7e429cf59ac8fc54c Mon Sep 17 00:00:00 2001 From: Baolin Wang Date: Mon, 17 Sep 2018 11:33:41 -0700 Subject: serial: sprd: Use readable macros instead of magic number Define readable macros instead of magic number to make code more readable. Signed-off-by: Baolin Wang Acked-by: Chunyan Zhang Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/sprd_serial.c | 25 +++++++++++++++++-------- 1 file changed, 17 insertions(+), 8 deletions(-) (limited to 'drivers/tty/serial/sprd_serial.c') diff --git a/drivers/tty/serial/sprd_serial.c b/drivers/tty/serial/sprd_serial.c index 1b0e3fbe546a..e18d8afc88ff 100644 --- a/drivers/tty/serial/sprd_serial.c +++ b/drivers/tty/serial/sprd_serial.c @@ -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) -- cgit v1.2.3-59-g8ed1b