diff options
Diffstat (limited to 'arch/arm/mach-lpc32xx/serial.c')
| -rw-r--r-- | arch/arm/mach-lpc32xx/serial.c | 33 |
1 files changed, 31 insertions, 2 deletions
diff --git a/arch/arm/mach-lpc32xx/serial.c b/arch/arm/mach-lpc32xx/serial.c index 3f9b30df9f0e..3e765c4bf986 100644 --- a/arch/arm/mach-lpc32xx/serial.c +++ b/arch/arm/mach-lpc32xx/serial.c @@ -16,8 +16,7 @@ #include <linux/clk.h> #include <linux/io.h> -#include <mach/hardware.h> -#include <mach/platform.h> +#include "lpc32xx.h" #include "common.h" #define LPC32XX_SUART_FIFO_SIZE 64 @@ -60,6 +59,36 @@ static struct uartinit uartinit_data[] __initdata = { }, }; +/* LPC3250 Errata HSUART.1: Hang workaround via loopback mode on inactivity */ +void lpc32xx_loopback_set(resource_size_t mapbase, int state) +{ + int bit; + u32 tmp; + + switch (mapbase) { + case LPC32XX_HS_UART1_BASE: + bit = 0; + break; + case LPC32XX_HS_UART2_BASE: + bit = 1; + break; + case LPC32XX_HS_UART7_BASE: + bit = 6; + break; + default: + WARN(1, "lpc32xx_hs: Warning: Unknown port at %08x\n", mapbase); + return; + } + + tmp = readl(LPC32XX_UARTCTL_CLOOP); + if (state) + tmp |= (1 << bit); + else + tmp &= ~(1 << bit); + writel(tmp, LPC32XX_UARTCTL_CLOOP); +} +EXPORT_SYMBOL_GPL(lpc32xx_loopback_set); + void __init lpc32xx_serial_init(void) { u32 tmp, clkmodes = 0; |