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authorYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 12:17:53 -0700
committerYunhong Jiang <yunhong.jiang@intel.com>2015-08-04 15:44:42 -0700
commit9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch)
tree1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/arch/arm/mach-lpc32xx/serial.c
parent98260f3884f4a202f9ca5eabed40b1354c489b29 (diff)
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base. It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and the base is: commit 0917f823c59692d751951bf5ea699a2d1e2f26a2 Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de> Date: Sat Jul 25 12:13:34 2015 +0200 Prepare v4.1.3-rt3 Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> We lose all the git history this way and it's not good. We should apply another opnfv project repo in future. Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423 Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/arch/arm/mach-lpc32xx/serial.c')
-rw-r--r--kernel/arch/arm/mach-lpc32xx/serial.c130
1 files changed, 130 insertions, 0 deletions
diff --git a/kernel/arch/arm/mach-lpc32xx/serial.c b/kernel/arch/arm/mach-lpc32xx/serial.c
new file mode 100644
index 000000000..05621a29f
--- /dev/null
+++ b/kernel/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);
+}