From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 arch/arm/mach-lpc32xx/serial.c | 130 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 arch/arm/mach-lpc32xx/serial.c

(limited to 'arch/arm/mach-lpc32xx/serial.c')

diff --git a/arch/arm/mach-lpc32xx/serial.c b/arch/arm/mach-lpc32xx/serial.c
new file mode 100644
index 000000000..05621a29f
--- /dev/null
+++ b/arch/arm/mach-lpc32xx/serial.c
@@ -0,0 +1,130 @@
+/*
+ * 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>
+#include <linux/types.h>
+#include <linux/serial.h>
+#include <linux/serial_core.h>
+#include <linux/serial_reg.h>
+#include <linux/serial_8250.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+
+#include <mach/hardware.h>
+#include <mach/platform.h>
+#include "common.h"
+
+#define LPC32XX_SUART_FIFO_SIZE	64
+
+struct uartinit {
+	char *uart_ck_name;
+	u32 ck_mode_mask;
+	void __iomem *pdiv_clk_reg;
+	resource_size_t mapbase;
+};
+
+static struct uartinit uartinit_data[] __initdata = {
+	{
+		.uart_ck_name = "uart5_ck",
+		.ck_mode_mask =
+			LPC32XX_UART_CLKMODE_LOAD(LPC32XX_UART_CLKMODE_ON, 5),
+		.pdiv_clk_reg = LPC32XX_CLKPWR_UART5_CLK_CTRL,
+		.mapbase = LPC32XX_UART5_BASE,
+	},
+	{
+		.uart_ck_name = "uart3_ck",
+		.ck_mode_mask =
+			LPC32XX_UART_CLKMODE_LOAD(LPC32XX_UART_CLKMODE_ON, 3),
+		.pdiv_clk_reg = LPC32XX_CLKPWR_UART3_CLK_CTRL,
+		.mapbase = LPC32XX_UART3_BASE,
+	},
+	{
+		.uart_ck_name = "uart4_ck",
+		.ck_mode_mask =
+			LPC32XX_UART_CLKMODE_LOAD(LPC32XX_UART_CLKMODE_ON, 4),
+		.pdiv_clk_reg = LPC32XX_CLKPWR_UART4_CLK_CTRL,
+		.mapbase = LPC32XX_UART4_BASE,
+	},
+	{
+		.uart_ck_name = "uart6_ck",
+		.ck_mode_mask =
+			LPC32XX_UART_CLKMODE_LOAD(LPC32XX_UART_CLKMODE_ON, 6),
+		.pdiv_clk_reg = LPC32XX_CLKPWR_UART6_CLK_CTRL,
+		.mapbase = LPC32XX_UART6_BASE,
+	},
+};
+
+void __init lpc32xx_serial_init(void)
+{
+	u32 tmp, clkmodes = 0;
+	struct clk *clk;
+	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)) {
+			clk_enable(clk);
+		}
+
+		/* Setup UART clock modes for all UARTs, disable autoclock */
+		clkmodes |= uartinit_data[i].ck_mode_mask;
+
+		/* pre-UART clock divider set to 1 */
+		__raw_writel(0x0101, uartinit_data[i].pdiv_clk_reg);
+
+		/*
+		 * Force a flush of the RX FIFOs to work around a
+		 * HW bug
+		 */
+		puart = uartinit_data[i].mapbase;
+		__raw_writel(0xC1, LPC32XX_UART_IIR_FCR(puart));
+		__raw_writel(0x00, LPC32XX_UART_DLL_FIFO(puart));
+		j = LPC32XX_SUART_FIFO_SIZE;
+		while (j--)
+			tmp = __raw_readl(
+				LPC32XX_UART_DLL_FIFO(puart));
+		__raw_writel(0, LPC32XX_UART_IIR_FCR(puart));
+	}
+
+	/* This needs to be done after all UART clocks are setup */
+	__raw_writel(clkmodes, LPC32XX_UARTCTL_CLKMODE);
+	for (i = 0; i < ARRAY_SIZE(uartinit_data); i++) {
+		/* Force a flush of the RX FIFOs to work around a HW bug */
+		puart = uartinit_data[i].mapbase;
+		__raw_writel(0xC1, LPC32XX_UART_IIR_FCR(puart));
+		__raw_writel(0x00, LPC32XX_UART_DLL_FIFO(puart));
+		j = LPC32XX_SUART_FIFO_SIZE;
+		while (j--)
+			tmp = __raw_readl(LPC32XX_UART_DLL_FIFO(puart));
+		__raw_writel(0, LPC32XX_UART_IIR_FCR(puart));
+	}
+
+	/* Disable IrDA pulsing support on UART6 */
+	tmp = __raw_readl(LPC32XX_UARTCTL_CTRL);
+	tmp |= LPC32XX_UART_UART6_IRDAMOD_BYPASS;
+	__raw_writel(tmp, LPC32XX_UARTCTL_CTRL);
+
+	/* Disable UART5->USB transparent mode or USB won't work */
+	tmp = __raw_readl(LPC32XX_UARTCTL_CTRL);
+	tmp &= ~LPC32XX_UART_U5_ROUTE_TO_USB;
+	__raw_writel(tmp, LPC32XX_UARTCTL_CTRL);
+}
-- 
cgit v1.2.3-54-g00ecf