diff options
Diffstat (limited to 'drivers/tty/serial/8250/8250_dw.c')
| -rw-r--r-- | drivers/tty/serial/8250/8250_dw.c | 51 |
1 files changed, 19 insertions, 32 deletions
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c index a3acbf0f5da1be..ba9f4dc4e71da5 100644 --- a/drivers/tty/serial/8250/8250_dw.c +++ b/drivers/tty/serial/8250/8250_dw.c @@ -100,14 +100,18 @@ static void dw8250_force_idle(struct uart_port *p) (void)p->serial_in(p, UART_RX); } -static void dw8250_check_lcr(struct uart_port *p, int value) +static void dw8250_check_lcr(struct uart_port *p, int offset, int value) { - void __iomem *offset = p->membase + (UART_LCR << p->regshift); + struct dw8250_data *d = to_dw8250_data(p->private_data); + void __iomem *addr = p->membase + (offset << p->regshift); int tries = 1000; + if (offset != UART_LCR || d->uart_16550_compatible) + return; + /* Make sure LCR write wasn't ignored */ while (tries--) { - unsigned int lcr = p->serial_in(p, UART_LCR); + unsigned int lcr = p->serial_in(p, offset); if ((value & ~UART_LCR_SPAR) == (lcr & ~UART_LCR_SPAR)) return; @@ -116,15 +120,15 @@ static void dw8250_check_lcr(struct uart_port *p, int value) #ifdef CONFIG_64BIT if (p->type == PORT_OCTEON) - __raw_writeq(value & 0xff, offset); + __raw_writeq(value & 0xff, addr); else #endif if (p->iotype == UPIO_MEM32) - writel(value, offset); + writel(value, addr); else if (p->iotype == UPIO_MEM32BE) - iowrite32be(value, offset); + iowrite32be(value, addr); else - writeb(value, offset); + writeb(value, addr); } /* * FIXME: this deadlocks if port->lock is already held @@ -158,12 +162,8 @@ static void dw8250_tx_wait_empty(struct uart_port *p) static void dw8250_serial_out(struct uart_port *p, int offset, int value) { - struct dw8250_data *d = to_dw8250_data(p->private_data); - writeb(value, p->membase + (offset << p->regshift)); - - if (offset == UART_LCR && !d->uart_16550_compatible) - dw8250_check_lcr(p, value); + dw8250_check_lcr(p, offset, value); } static void dw8250_serial_out38x(struct uart_port *p, int offset, int value) @@ -185,35 +185,26 @@ static unsigned int dw8250_serial_in(struct uart_port *p, int offset) #ifdef CONFIG_64BIT static unsigned int dw8250_serial_inq(struct uart_port *p, int offset) { - unsigned int value; - - value = (u8)__raw_readq(p->membase + (offset << p->regshift)); + u8 value = __raw_readq(p->membase + (offset << p->regshift)); return dw8250_modify_msr(p, offset, value); } static void dw8250_serial_outq(struct uart_port *p, int offset, int value) { - struct dw8250_data *d = to_dw8250_data(p->private_data); - value &= 0xff; __raw_writeq(value, p->membase + (offset << p->regshift)); /* Read back to ensure register write ordering. */ __raw_readq(p->membase + (UART_LCR << p->regshift)); - if (offset == UART_LCR && !d->uart_16550_compatible) - dw8250_check_lcr(p, value); + dw8250_check_lcr(p, offset, value); } #endif /* CONFIG_64BIT */ static void dw8250_serial_out32(struct uart_port *p, int offset, int value) { - struct dw8250_data *d = to_dw8250_data(p->private_data); - writel(value, p->membase + (offset << p->regshift)); - - if (offset == UART_LCR && !d->uart_16550_compatible) - dw8250_check_lcr(p, value); + dw8250_check_lcr(p, offset, value); } static unsigned int dw8250_serial_in32(struct uart_port *p, int offset) @@ -225,12 +216,8 @@ static unsigned int dw8250_serial_in32(struct uart_port *p, int offset) static void dw8250_serial_out32be(struct uart_port *p, int offset, int value) { - struct dw8250_data *d = to_dw8250_data(p->private_data); - iowrite32be(value, p->membase + (offset << p->regshift)); - - if (offset == UART_LCR && !d->uart_16550_compatible) - dw8250_check_lcr(p, value); + dw8250_check_lcr(p, offset, value); } static unsigned int dw8250_serial_in32be(struct uart_port *p, int offset) @@ -356,9 +343,9 @@ static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios, long rate; int ret; + clk_disable_unprepare(d->clk); rate = clk_round_rate(d->clk, newrate); - if (rate > 0 && p->uartclk != rate) { - clk_disable_unprepare(d->clk); + if (rate > 0) { /* * Note that any clock-notifer worker will block in * serial8250_update_uartclk() until we are done. @@ -366,8 +353,8 @@ static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios, ret = clk_set_rate(d->clk, newrate); if (!ret) p->uartclk = rate; - clk_prepare_enable(d->clk); } + clk_prepare_enable(d->clk); dw8250_do_set_termios(p, termios, old); } |