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Based on 3 normalized pattern(s): 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 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 [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] 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 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 [author] [graeme] [gregory] [gg]@[slimlogic] [co] [uk] [author] [kishon] [vijay] [abraham] [i] [kishon]@[ti] [com] [based] [on] [twl6030]_[usb] [c] [author] [hema] [hk] [hemahk]@[ti] [com] 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 extracted by the scancode license scanner the SPDX license identifier GPL-2.0-or-later has been chosen to replace the boilerplate/reference in 1105 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Allison Randal <allison@lohutok.net> Reviewed-by: Richard Fontana <rfontana@redhat.com> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190527070033.202006027@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* arch/arm/mach-lpc32xx/serial.c
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*
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* Author: Kevin Wells <kevin.wells@nxp.com>
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*
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* Copyright (C) 2010 NXP Semiconductors
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*/
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#include <linux/kernel.h>
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#include <linux/types.h>
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#include <linux/serial.h>
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#include <linux/serial_core.h>
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#include <linux/serial_reg.h>
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#include <linux/serial_8250.h>
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#include <linux/clk.h>
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#include <linux/io.h>
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#include <mach/hardware.h>
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#include <mach/platform.h>
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#include "common.h"
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#define LPC32XX_SUART_FIFO_SIZE 64
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struct uartinit {
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char *uart_ck_name;
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u32 ck_mode_mask;
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void __iomem *pdiv_clk_reg;
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resource_size_t mapbase;
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};
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static struct uartinit uartinit_data[] __initdata = {
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{
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.uart_ck_name = "uart5_ck",
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.ck_mode_mask =
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LPC32XX_UART_CLKMODE_LOAD(LPC32XX_UART_CLKMODE_ON, 5),
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.pdiv_clk_reg = LPC32XX_CLKPWR_UART5_CLK_CTRL,
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.mapbase = LPC32XX_UART5_BASE,
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},
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{
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.uart_ck_name = "uart3_ck",
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.ck_mode_mask =
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LPC32XX_UART_CLKMODE_LOAD(LPC32XX_UART_CLKMODE_ON, 3),
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.pdiv_clk_reg = LPC32XX_CLKPWR_UART3_CLK_CTRL,
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.mapbase = LPC32XX_UART3_BASE,
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},
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{
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.uart_ck_name = "uart4_ck",
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.ck_mode_mask =
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LPC32XX_UART_CLKMODE_LOAD(LPC32XX_UART_CLKMODE_ON, 4),
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.pdiv_clk_reg = LPC32XX_CLKPWR_UART4_CLK_CTRL,
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.mapbase = LPC32XX_UART4_BASE,
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},
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{
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.uart_ck_name = "uart6_ck",
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.ck_mode_mask =
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LPC32XX_UART_CLKMODE_LOAD(LPC32XX_UART_CLKMODE_ON, 6),
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.pdiv_clk_reg = LPC32XX_CLKPWR_UART6_CLK_CTRL,
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.mapbase = LPC32XX_UART6_BASE,
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},
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};
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void __init lpc32xx_serial_init(void)
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{
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u32 tmp, clkmodes = 0;
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struct clk *clk;
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unsigned int puart;
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int i, j;
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for (i = 0; i < ARRAY_SIZE(uartinit_data); i++) {
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clk = clk_get(NULL, uartinit_data[i].uart_ck_name);
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if (!IS_ERR(clk)) {
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clk_enable(clk);
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}
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/* Setup UART clock modes for all UARTs, disable autoclock */
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clkmodes |= uartinit_data[i].ck_mode_mask;
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/* pre-UART clock divider set to 1 */
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__raw_writel(0x0101, uartinit_data[i].pdiv_clk_reg);
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/*
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* Force a flush of the RX FIFOs to work around a
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* HW bug
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*/
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puart = uartinit_data[i].mapbase;
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__raw_writel(0xC1, LPC32XX_UART_IIR_FCR(puart));
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__raw_writel(0x00, LPC32XX_UART_DLL_FIFO(puart));
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j = LPC32XX_SUART_FIFO_SIZE;
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while (j--)
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tmp = __raw_readl(
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LPC32XX_UART_DLL_FIFO(puart));
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__raw_writel(0, LPC32XX_UART_IIR_FCR(puart));
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}
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/* This needs to be done after all UART clocks are setup */
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__raw_writel(clkmodes, LPC32XX_UARTCTL_CLKMODE);
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for (i = 0; i < ARRAY_SIZE(uartinit_data); i++) {
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/* Force a flush of the RX FIFOs to work around a HW bug */
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puart = uartinit_data[i].mapbase;
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__raw_writel(0xC1, LPC32XX_UART_IIR_FCR(puart));
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__raw_writel(0x00, LPC32XX_UART_DLL_FIFO(puart));
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j = LPC32XX_SUART_FIFO_SIZE;
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while (j--)
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tmp = __raw_readl(LPC32XX_UART_DLL_FIFO(puart));
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__raw_writel(0, LPC32XX_UART_IIR_FCR(puart));
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}
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/* Disable IrDA pulsing support on UART6 */
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tmp = __raw_readl(LPC32XX_UARTCTL_CTRL);
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tmp |= LPC32XX_UART_UART6_IRDAMOD_BYPASS;
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__raw_writel(tmp, LPC32XX_UARTCTL_CTRL);
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/* Disable UART5->USB transparent mode or USB won't work */
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tmp = __raw_readl(LPC32XX_UARTCTL_CTRL);
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tmp &= ~LPC32XX_UART_U5_ROUTE_TO_USB;
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__raw_writel(tmp, LPC32XX_UARTCTL_CTRL);
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}
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