diff options
Diffstat (limited to 'arch/arm/mach-omap2/serial.c')
| -rw-r--r-- | arch/arm/mach-omap2/serial.c | 31 |
1 files changed, 28 insertions, 3 deletions
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c index 5f3035ec0d6f..b79bc8926cc9 100644 --- a/arch/arm/mach-omap2/serial.c +++ b/arch/arm/mach-omap2/serial.c @@ -23,6 +23,7 @@ #include <linux/serial_reg.h> #include <linux/clk.h> #include <linux/io.h> +#include <linux/delay.h> #include <plat/common.h> #include <plat/board.h> @@ -160,6 +161,13 @@ static inline unsigned int serial_read_reg(struct plat_serial8250_port *up, return (unsigned int)__raw_readb(up->membase + offset); } +static inline void __serial_write_reg(struct uart_port *up, int offset, + int value) +{ + offset <<= up->regshift; + __raw_writeb(value, up->membase + offset); +} + static inline void serial_write_reg(struct plat_serial8250_port *p, int offset, int value) { @@ -620,6 +628,20 @@ static unsigned int serial_in_override(struct uart_port *up, int offset) return __serial_read_reg(up, offset); } +static void serial_out_override(struct uart_port *up, int offset, int value) +{ + unsigned int status, tmout = 10000; + + status = __serial_read_reg(up, UART_LSR); + while (!(status & UART_LSR_THRE)) { + /* Wait up to 10ms for the character(s) to be sent. */ + if (--tmout == 0) + break; + udelay(1); + status = __serial_read_reg(up, UART_LSR); + } + __serial_write_reg(up, offset, value); +} void __init omap_serial_early_init(void) { int i; @@ -721,11 +743,14 @@ void __init omap_serial_init_port(int port) * omap3xxx: Never read empty UART fifo on UARTs * with IP rev >=0x52 */ - if (cpu_is_omap44xx()) + if (cpu_is_omap44xx()) { uart->p->serial_in = serial_in_override; - else if ((serial_read_reg(uart->p, UART_OMAP_MVER) & 0xFF) - >= UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV) + uart->p->serial_out = serial_out_override; + } else if ((serial_read_reg(uart->p, UART_OMAP_MVER) & 0xFF) + >= UART_OMAP_NO_EMPTY_FIFO_READ_IP_REV) { uart->p->serial_in = serial_in_override; + uart->p->serial_out = serial_out_override; + } } /** |