From: Jaikumar Ganesh <jaikumar@google.com>
Date: Mon, 6 Dec 2010 21:52:44 +0000 (-0800)
Subject: [ARM] tegra: stingray: Add optional low power mode callbacks.
X-Git-Tag: firefly_0821_release~9834^2~275
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=5556e08c6e09928c26d2230f7738104ec27a0ff5;p=firefly-linux-kernel-4.4.55.git

[ARM] tegra: stingray: Add optional low power mode callbacks.

Change-Id: Ia9821142252f6df8d81ec6356c6b2126f5d8d508
Signed-off-by: Jaikumar Ganesh <jaikumar@google.com>
---

diff --git a/arch/arm/mach-tegra/include/mach/tegra_hsuart.h b/arch/arm/mach-tegra/include/mach/tegra_hsuart.h
new file mode 100644
index 000000000000..ae459aa4917e
--- /dev/null
+++ b/arch/arm/mach-tegra/include/mach/tegra_hsuart.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2010 Google, Inc.
+ * Author: Jaikumar Ganesh <jaikumar@google.com>
+ *
+ * This software is licensed under the terms of the GNU General Public
+ * License version 2, as published by the Free Software Foundation, and
+ * may be copied, distributed, and modified under those terms.
+ *
+ * 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.
+ */
+
+#ifndef __ASM_ARCH_TEGRA_HSUART_H
+#define __ASM_ARCH_TEGRA_HSUART_H
+
+/* Optional platform device data for tegra_hsuart driver. */
+struct tegra_hsuart_platform_data {
+	void (*exit_lpm_cb)(struct uart_port *);
+};
+
+#endif
diff --git a/drivers/serial/tegra_hsuart.c b/drivers/serial/tegra_hsuart.c
index 09f5f454683c..6f2913d91cfe 100644
--- a/drivers/serial/tegra_hsuart.c
+++ b/drivers/serial/tegra_hsuart.c
@@ -43,6 +43,7 @@
 #include <linux/workqueue.h>
 #include <mach/dma.h>
 #include <mach/clk.h>
+#include <mach/tegra_hsuart.h>
 
 #define TX_EMPTY_STATUS (UART_LSR_TEMT | UART_LSR_THRE)
 
@@ -118,6 +119,10 @@ struct tegra_uart_port {
 
 	bool			rx_timeout;
 	int			rx_in_progress;
+
+	/* optional callback to exit low power mode */
+	void (*exit_lpm_cb)(struct uart_port *);
+
 };
 
 static inline u8 uart_readb(struct tegra_uart_port *t, unsigned long reg)
@@ -238,6 +243,9 @@ static void tegra_start_tx(struct uart_port *u)
 	t = container_of(u, struct tegra_uart_port, uport);
 	xmit = &u->state->xmit;
 
+	if (t->exit_lpm_cb)
+		t->exit_lpm_cb(u);
+
 	if (!uart_circ_empty(xmit) && !t->tx_in_progress)
 		tegra_start_next_tx(t);
 }
@@ -1223,6 +1231,7 @@ static int tegra_uart_probe(struct platform_device *pdev)
 	struct tegra_uart_port *t;
 	struct uart_port *u;
 	struct resource *resource;
+	struct tegra_hsuart_platform_data *pdata = pdev->dev.platform_data;
 	int ret;
 	char name[64];
 	if (pdev->id < 0 || pdev->id > tegra_uart_driver.nr) {
@@ -1258,6 +1267,9 @@ static int tegra_uart_probe(struct platform_device *pdev)
 
 	u->regshift = 2;
 
+	if (pdata)
+		t->exit_lpm_cb = pdata->exit_lpm_cb;
+
 	t->clk = clk_get(&pdev->dev, NULL);
 	if (!t->clk) {
 		dev_err(&pdev->dev, "Couldn't get the clock\n");