arch/arm/mach-omap2/serial.c - kernel/msm-4.9 - Gitiles

 /*
  * 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);
 }
	/*
	* 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);
	}