diff options
Diffstat (limited to 'arch/arm/mach-lpc32xx/serial.c')
| -rw-r--r-- | arch/arm/mach-lpc32xx/serial.c | 48 |
1 files changed, 33 insertions, 15 deletions
diff --git a/arch/arm/mach-lpc32xx/serial.c b/arch/arm/mach-lpc32xx/serial.c index 05621a29fba2..3b1203db81b2 100644 --- a/arch/arm/mach-lpc32xx/serial.c +++ b/arch/arm/mach-lpc32xx/serial.c @@ -1,19 +1,10 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * arch/arm/mach-lpc32xx/serial.c * * Author: Kevin Wells <kevin.wells@nxp.com> * * Copyright (C) 2010 NXP Semiconductors - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. */ #include <linux/kernel.h> @@ -24,9 +15,9 @@ #include <linux/serial_8250.h> #include <linux/clk.h> #include <linux/io.h> +#include <linux/soc/nxp/lpc32xx-misc.h> -#include <mach/hardware.h> -#include <mach/platform.h> +#include "lpc32xx.h" #include "common.h" #define LPC32XX_SUART_FIFO_SIZE 64 @@ -69,6 +60,36 @@ 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; @@ -76,9 +97,6 @@ void __init lpc32xx_serial_init(void) unsigned int puart; int i, j; - /* UART clocks are off, let clock driver manage them */ - __raw_writel(0, LPC32XX_CLKPWR_UART_CLK_CTRL); - for (i = 0; i < ARRAY_SIZE(uartinit_data); i++) { clk = clk_get(NULL, uartinit_data[i].uart_ck_name); if (!IS_ERR(clk)) { |