1 files changed, 318 insertions, 0 deletions
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c
new file mode 100644
index 00000000..9fc2f441
--- /dev/null
+++ b/arch/arm/mach-omap2/serial.c
@@ -0,0 +1,318 @@
+/*
+ * arch/arm/mach-omap2/serial.c
+ *
+ * OMAP2 serial support.
+ *
+ * Copyright (C) 2005-2008 Nokia Corporation
+ * Author: Paul Mundt <paul.mundt@nokia.com>
+ *
+ * Major rework for PM support by Kevin Hilman
+ *
+ * Based off of arch/arm/mach-omap/omap1/serial.c
+ *
+ * Copyright (C) 2009 Texas Instruments
+ * Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/delay.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/pm_runtime.h>
+#include <linux/console.h>
+
+#include <plat/omap-serial.h>
+#include "common.h"
+#include <plat/board.h>
+#include <plat/dma.h>
+#include <plat/omap_hwmod.h>
+#include <plat/omap_device.h>
+#include <plat/omap-pm.h>
+
+#include "prm2xxx_3xxx.h"
+#include "pm.h"
+#include "cm2xxx_3xxx.h"
+#include "prm-regbits-34xx.h"
+#include "control.h"
+#include "mux.h"
+
+/*
+ * NOTE: By default the serial auto_suspend timeout is disabled as it causes
+ * lost characters over the serial ports. This means that the UART clocks will
+ * stay on until power/autosuspend_delay is set for the uart from sysfs.
+ * This also causes that any deeper omap sleep states are blocked.
+ */
+#define DEFAULT_AUTOSUSPEND_DELAY	-1
+
+#define MAX_UART_HWMOD_NAME_LEN		16
+
+struct omap_uart_state {
+	int num;
+
+	struct list_head node;
+	struct omap_hwmod *oh;
+};
+
+static LIST_HEAD(uart_list);
+static u8 num_uarts;
+static u8 console_uart_id = -1;
+static u8 no_console_suspend;
+static u8 uart_debug;
+
+#define DEFAULT_RXDMA_POLLRATE		1	/* RX DMA polling rate (us) */
+#define DEFAULT_RXDMA_BUFSIZE		4096	/* RX DMA buffer size */
+#define DEFAULT_RXDMA_TIMEOUT		(3 * HZ)/* RX DMA timeout (jiffies) */
+
+static struct omap_uart_port_info omap_serial_default_info[] __initdata = {
+	{
+		.dma_enabled	= false,
+		.dma_rx_buf_size = DEFAULT_RXDMA_BUFSIZE,
+		.dma_rx_poll_rate = DEFAULT_RXDMA_POLLRATE,
+		.dma_rx_timeout = DEFAULT_RXDMA_TIMEOUT,
+		.autosuspend_timeout = DEFAULT_AUTOSUSPEND_DELAY,
+	},
+};
+
+#ifdef CONFIG_PM
+static void omap_uart_enable_wakeup(struct platform_device *pdev, bool enable)
+{
+	struct omap_device *od = to_omap_device(pdev);
+
+	if (!od)
+		return;
+
+	if (enable)
+		omap_hwmod_enable_wakeup(od->hwmods[0]);
+	else
+		omap_hwmod_disable_wakeup(od->hwmods[0]);
+}
+
+/*
+ * Errata i291: [UART]:Cannot Acknowledge Idle Requests
+ * in Smartidle Mode When Configured for DMA Operations.
+ * WA: configure uart in force idle mode.
+ */
+static void omap_uart_set_noidle(struct platform_device *pdev)
+{
+	struct omap_device *od = to_omap_device(pdev);
+
+	omap_hwmod_set_slave_idlemode(od->hwmods[0], HWMOD_IDLEMODE_NO);
+}
+
+static void omap_uart_set_smartidle(struct platform_device *pdev)
+{
+	struct omap_device *od = to_omap_device(pdev);
+	u8 idlemode;
+
+	if (od->hwmods[0]->class->sysc->idlemodes & SIDLE_SMART_WKUP)
+		idlemode = HWMOD_IDLEMODE_SMART_WKUP;
+	else
+		idlemode = HWMOD_IDLEMODE_SMART;
+
+	omap_hwmod_set_slave_idlemode(od->hwmods[0], idlemode);
+}
+
+#else
+static void omap_uart_enable_wakeup(struct platform_device *pdev, bool enable)
+{}
+static void omap_uart_set_noidle(struct platform_device *pdev) {}
+static void omap_uart_set_smartidle(struct platform_device *pdev) {}
+#endif /* CONFIG_PM */
+
+#ifdef CONFIG_OMAP_MUX
+static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
+{
+}
+#else
+static void omap_serial_fill_default_pads(struct omap_board_data *bdata) {}
+#endif
+
+char *cmdline_find_option(char *str)
+{
+	extern char *saved_command_line;
+
+	return strstr(saved_command_line, str);
+}
+
+static int __init omap_serial_early_init(void)
+{
+	do {
+		char oh_name[MAX_UART_HWMOD_NAME_LEN];
+		struct omap_hwmod *oh;
+		struct omap_uart_state *uart;
+		char uart_name[MAX_UART_HWMOD_NAME_LEN];
+
+		snprintf(oh_name, MAX_UART_HWMOD_NAME_LEN,
+			 "uart%d", num_uarts + 1);
+		oh = omap_hwmod_lookup(oh_name);
+		if (!oh)
+			break;
+
+		uart = kzalloc(sizeof(struct omap_uart_state), GFP_KERNEL);
+		if (WARN_ON(!uart))
+			return -ENODEV;
+
+		uart->oh = oh;
+		uart->num = num_uarts++;
+		list_add_tail(&uart->node, &uart_list);
+		snprintf(uart_name, MAX_UART_HWMOD_NAME_LEN,
+				"%s%d", OMAP_SERIAL_NAME, uart->num);
+
+		if (cmdline_find_option(uart_name)) {
+			console_uart_id = uart->num;
+
+			if (console_loglevel >= 10) {
+				uart_debug = true;
+				pr_info("%s used as console in debug mode"
+						" uart%d clocks will not be"
+						" gated", uart_name, uart->num);
+			}
+
+			if (cmdline_find_option("no_console_suspend"))
+				no_console_suspend = true;
+
+			/*
+			 * omap-uart can be used for earlyprintk logs
+			 * So if omap-uart is used as console then prevent
+			 * uart reset and idle to get logs from omap-uart
+			 * until uart console driver is available to take
+			 * care for console messages.
+			 * Idling or resetting omap-uart while printing logs
+			 * early boot logs can stall the boot-up.
+			 */
+			oh->flags |= HWMOD_INIT_NO_IDLE | HWMOD_INIT_NO_RESET;
+		}
+	} while (1);
+
+	return 0;
+}
+core_initcall(omap_serial_early_init);
+
+/**
+ * omap_serial_init_port() - initialize single serial port
+ * @bdata: port specific board data pointer
+ * @info: platform specific data pointer
+ *
+ * This function initialies serial driver for given port only.
+ * Platforms can call this function instead of omap_serial_init()
+ * if they don't plan to use all available UARTs as serial ports.
+ *
+ * Don't mix calls to omap_serial_init_port() and omap_serial_init(),
+ * use only one of the two.
+ */
+void __init omap_serial_init_port(struct omap_board_data *bdata,
+			struct omap_uart_port_info *info)
+{
+	struct omap_uart_state *uart;
+	struct omap_hwmod *oh;
+	struct platform_device *pdev;
+	void *pdata = NULL;
+	u32 pdata_size = 0;
+	char *name;
+	struct omap_uart_port_info omap_up;
+
+	if (WARN_ON(!bdata))
+		return;
+	if (WARN_ON(bdata->id < 0))
+		return;
+	if (WARN_ON(bdata->id >= num_uarts))
+		return;
+
+	list_for_each_entry(uart, &uart_list, node)
+		if (bdata->id == uart->num)
+			break;
+	if (!info)
+		info = omap_serial_default_info;
+
+	oh = uart->oh;
+	name = DRIVER_NAME;
+
+	omap_up.dma_enabled = info->dma_enabled;
+	omap_up.uartclk = OMAP24XX_BASE_BAUD * 16;
+	omap_up.flags = UPF_BOOT_AUTOCONF;
+	omap_up.get_context_loss_count = omap_pm_get_dev_context_loss_count;
+	omap_up.set_forceidle = omap_uart_set_smartidle;
+	omap_up.set_noidle = omap_uart_set_noidle;
+	omap_up.enable_wakeup = omap_uart_enable_wakeup;
+	omap_up.dma_rx_buf_size = info->dma_rx_buf_size;
+	omap_up.dma_rx_timeout = info->dma_rx_timeout;
+	omap_up.dma_rx_poll_rate = info->dma_rx_poll_rate;
+	omap_up.autosuspend_timeout = info->autosuspend_timeout;
+
+	/* Enable the MDR1 Errata i202 for OMAP2430/3xxx/44xx */
+	if (!cpu_is_omap2420() && !cpu_is_ti816x())
+		omap_up.errata |= UART_ERRATA_i202_MDR1_ACCESS;
+
+	/* Enable DMA Mode Force Idle Errata i291 for omap34xx/3630 */
+	if (cpu_is_omap34xx() || cpu_is_omap3630())
+		omap_up.errata |= UART_ERRATA_i291_DMA_FORCEIDLE;
+
+	pdata = &omap_up;
+	pdata_size = sizeof(struct omap_uart_port_info);
+
+	if (WARN_ON(!oh))
+		return;
+
+	pdev = omap_device_build(name, uart->num, oh, pdata, pdata_size,
+				 NULL, 0, false);
+	WARN(IS_ERR(pdev), "Could not build omap_device for %s: %s.\n",
+	     name, oh->name);
+
+	if ((console_uart_id == bdata->id) && no_console_suspend)
+		omap_device_disable_idle_on_suspend(pdev);
+
+	oh->mux = omap_hwmod_mux_init(bdata->pads, bdata->pads_cnt);
+
+	oh->dev_attr = uart;
+
+	if (((cpu_is_omap34xx() || cpu_is_omap44xx()) && bdata->pads)
+			&& !uart_debug)
+		device_init_wakeup(&pdev->dev, true);
+}
+
+/**
+ * omap_serial_board_init() - initialize all supported serial ports
+ * @info: platform specific data pointer
+ *
+ * Initializes all available UARTs as serial ports. Platforms
+ * can call this function when they want to have default behaviour
+ * for serial ports (e.g initialize them all as serial ports).
+ */
+void __init omap_serial_board_init(struct omap_uart_port_info *info)
+{
+	struct omap_uart_state *uart;
+	struct omap_board_data bdata;
+
+	list_for_each_entry(uart, &uart_list, node) {
+		bdata.id = uart->num;
+		bdata.flags = 0;
+		bdata.pads = NULL;
+		bdata.pads_cnt = 0;
+
+		if (cpu_is_omap44xx() || cpu_is_omap34xx())
+			omap_serial_fill_default_pads(&bdata);
+
+		if (!info)
+			omap_serial_init_port(&bdata, NULL);
+		else
+			omap_serial_init_port(&bdata, &info[uart->num]);
+	}
+}
+
+/**
+ * omap_serial_init() - initialize all supported serial ports
+ *
+ * Initializes all available UARTs.
+ * Platforms can call this function when they want to have default behaviour
+ * for serial ports (e.g initialize them all as serial ports).
+ */
+void __init omap_serial_init(void)
+{
+	omap_serial_board_init(NULL);
+}