[deliverable/linux.git] / arch / arm / mach-omap2 / serial.c

/*
 * 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 <linux/omap-dma.h>

#include <plat/omap-serial.h>

#include "common.h"
#include "omap_hwmod.h"
#include "omap_device.h"
#include "omap-pm.h"
#include "soc.h"
#include "prm2xxx_3xxx.h"
#include "pm.h"
#include "cm2xxx_3xxx.h"
#include "prm-regbits-34xx.h"
#include "control.h"
#include "mux.h"
#include "serial.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;
	struct omap_device_pad default_omap_uart_pads[2];
};

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 device *dev, bool enable)
{
	struct platform_device *pdev = to_platform_device(dev);
	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 device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	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 device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	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 device *dev, bool enable)
{}
static void omap_uart_set_noidle(struct device *dev) {}
static void omap_uart_set_smartidle(struct device *dev) {}
#endif /* CONFIG_PM */

#ifdef CONFIG_OMAP_MUX

#define OMAP_UART_DEFAULT_PAD_NAME_LEN	28
static char rx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN],
		tx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN] __initdata;

static void  __init
omap_serial_fill_uart_tx_rx_pads(struct omap_board_data *bdata,
				struct omap_uart_state *uart)
{
	uart->default_omap_uart_pads[0].name = rx_pad_name;
	uart->default_omap_uart_pads[0].flags = OMAP_DEVICE_PAD_REMUX |
							OMAP_DEVICE_PAD_WAKEUP;
	uart->default_omap_uart_pads[0].enable = OMAP_PIN_INPUT |
							OMAP_MUX_MODE0;
	uart->default_omap_uart_pads[0].idle = OMAP_PIN_INPUT | OMAP_MUX_MODE0;
	uart->default_omap_uart_pads[1].name = tx_pad_name;
	uart->default_omap_uart_pads[1].enable = OMAP_PIN_OUTPUT |
							OMAP_MUX_MODE0;
	bdata->pads = uart->default_omap_uart_pads;
	bdata->pads_cnt = ARRAY_SIZE(uart->default_omap_uart_pads);
}

static void  __init omap_serial_check_wakeup(struct omap_board_data *bdata,
						struct omap_uart_state *uart)
{
	struct omap_mux_partition *tx_partition = NULL, *rx_partition = NULL;
	struct omap_mux *rx_mux = NULL, *tx_mux = NULL;
	char *rx_fmt, *tx_fmt;
	int uart_nr = bdata->id + 1;

	if (bdata->id != 2) {
		rx_fmt = "uart%d_rx.uart%d_rx";
		tx_fmt = "uart%d_tx.uart%d_tx";
	} else {
		rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx";
		tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx";
	}

	snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt,
			uart_nr, uart_nr);
	snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt,
			uart_nr, uart_nr);

	if (omap_mux_get_by_name(rx_pad_name, &rx_partition, &rx_mux) >= 0 &&
			omap_mux_get_by_name
				(tx_pad_name, &tx_partition, &tx_mux) >= 0) {
		u16 tx_mode, rx_mode;

		tx_mode = omap_mux_read(tx_partition, tx_mux->reg_offset);
		rx_mode = omap_mux_read(rx_partition, rx_mux->reg_offset);

		/*
		 * Check if uart is used in default tx/rx mode i.e. in mux mode0
		 * if yes then configure rx pin for wake up capability
		 */
		if (OMAP_MODE_UART(rx_mode) && OMAP_MODE_UART(tx_mode))
			omap_serial_fill_uart_tx_rx_pads(bdata, uart);
	}
}
#else
static void __init omap_serial_check_wakeup(struct omap_board_data *bdata,
		struct omap_uart_state *uart)
{
}
#endif

static 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;
	omap_up.DTR_gpio = info->DTR_gpio;
	omap_up.DTR_inverted = info->DTR_inverted;
	omap_up.DTR_present = info->DTR_present;

	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);
	if (IS_ERR(pdev)) {
		WARN(1, "Could not build omap_device for %s: %s.\n", name,
		     oh->name);
		return;
	}

	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);

	if (console_uart_id == bdata->id) {
		omap_device_enable(pdev);
		pm_runtime_set_active(&pdev->dev);
	}

	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;

		omap_serial_check_wakeup(&bdata, uart);

		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);
}
Commit	Line	Data
1dbae815	1	/*
f30c2269	2	* arch/arm/mach-omap2/serial.c
1dbae815 TL	3	*
	4	* OMAP2 serial support.
	5	*
6e81176d	6	* Copyright (C) 2005-2008 Nokia Corporation
1dbae815 TL	7	* Author: Paul Mundt <paul.mundt@nokia.com>
1dbae815 TL	8	*
4af4016c KH	9	* Major rework for PM support by Kevin Hilman
4af4016c KH	10	*
1dbae815 TL	11	* Based off of arch/arm/mach-omap/omap1/serial.c
1dbae815 TL	12	*
44169075 SS	13	* Copyright (C) 2009 Texas Instruments
	14	* Added OMAP4 support - Santosh Shilimkar <santosh.shilimkar@ti.com
	15	*
1dbae815 TL	16	* This file is subject to the terms and conditions of the GNU General Public
	17	* License. See the file "COPYING" in the main directory of this archive
	18	* for more details.
	19	*/
	20	#include <linux/kernel.h>
	21	#include <linux/init.h>
f8ce2547	22	#include <linux/clk.h>
fced80c7	23	#include <linux/io.h>
e03d37d8	24	#include <linux/delay.h>
6f251e9d KH	25	#include <linux/platform_device.h>
6f251e9d KH	26	#include <linux/slab.h>
3244fcd2	27	#include <linux/pm_runtime.h>
0d8e2d0d	28	#include <linux/console.h>
45c3eb7d	29	#include <linux/omap-dma.h>
6f251e9d	30
6f251e9d	31	#include <plat/omap-serial.h>
4af4016c	32
2a296c8f TL	33	#include "common.h"
	34	#include "omap_hwmod.h"
	35	#include "omap_device.h"
1d5aef49	36	#include "omap-pm.h"
e4c060db	37	#include "soc.h"
59fb659b	38	#include "prm2xxx_3xxx.h"
4af4016c	39	#include "pm.h"
59fb659b	40	#include "cm2xxx_3xxx.h"
4af4016c	41	#include "prm-regbits-34xx.h"
4814ced5	42	#include "control.h"
40e44399	43	#include "mux.h"
3d82cbbb	44	#include "serial.h"
4af4016c	45
301fe8ee	46	/*
c86845db D	47	* NOTE: By default the serial auto_suspend timeout is disabled as it causes
	48	* lost characters over the serial ports. This means that the UART clocks will
	49	* stay on until power/autosuspend_delay is set for the uart from sysfs.
	50	* This also causes that any deeper omap sleep states are blocked.
301fe8ee	51	*/
c86845db	52	#define DEFAULT_AUTOSUSPEND_DELAY -1
4af4016c	53
6f251e9d KH	54	#define MAX_UART_HWMOD_NAME_LEN 16
6f251e9d KH	55
4af4016c KH	56	struct omap_uart_state {
4af4016c KH	57	int num;
4af4016c	58
4af4016c	59	struct list_head node;
6f251e9d	60	struct omap_hwmod *oh;
91930652	61	struct omap_device_pad default_omap_uart_pads[2];
4af4016c KH	62	};
4af4016c KH	63
4af4016c	64	static LIST_HEAD(uart_list);
6f251e9d	65	static u8 num_uarts;
8612bd22	66	static u8 console_uart_id = -1;
08f86b3e	67	static u8 no_console_suspend;
36fc2d15	68	static u8 uart_debug;
1dbae815	69
a9e210e0	70	#define DEFAULT_RXDMA_POLLRATE 1 /* RX DMA polling rate (us) */
c86845db	71	#define DEFAULT_RXDMA_BUFSIZE 4096 /* RX DMA buffer size */
a9e210e0	72	#define DEFAULT_RXDMA_TIMEOUT (3 * HZ)/* RX DMA timeout (jiffies) */
c86845db D	73
	74	static struct omap_uart_port_info omap_serial_default_info[] __initdata = {
	75	{
	76	.dma_enabled = false,
	77	.dma_rx_buf_size = DEFAULT_RXDMA_BUFSIZE,
a9e210e0	78	.dma_rx_poll_rate = DEFAULT_RXDMA_POLLRATE,
c86845db D	79	.dma_rx_timeout = DEFAULT_RXDMA_TIMEOUT,
	80	.autosuspend_timeout = DEFAULT_AUTOSUSPEND_DELAY,
	81	},
	82	};
	83
4af4016c	84	#ifdef CONFIG_PM
d8ee4ea6	85	static void omap_uart_enable_wakeup(struct device *dev, bool enable)
4af4016c	86	{
d8ee4ea6	87	struct platform_device *pdev = to_platform_device(dev);
62f3ec5f	88	struct omap_device *od = to_omap_device(pdev);
4af4016c	89
62f3ec5f G	90	if (!od)
62f3ec5f G	91	return;
4af4016c	92
62f3ec5f G	93	if (enable)
	94	omap_hwmod_enable_wakeup(od->hwmods[0]);
	95	else
	96	omap_hwmod_disable_wakeup(od->hwmods[0]);
ba87a9be JH	97	}
ba87a9be JH	98
94734749 G	99	/*
	100	* Errata i291: [UART]:Cannot Acknowledge Idle Requests
	101	* in Smartidle Mode When Configured for DMA Operations.
	102	* WA: configure uart in force idle mode.
	103	*/
d8ee4ea6	104	static void omap_uart_set_noidle(struct device *dev)
94734749	105	{
d8ee4ea6	106	struct platform_device *pdev = to_platform_device(dev);
94734749 G	107	struct omap_device *od = to_omap_device(pdev);
	108
	109	omap_hwmod_set_slave_idlemode(od->hwmods[0], HWMOD_IDLEMODE_NO);
	110	}
	111
d8ee4ea6	112	static void omap_uart_set_smartidle(struct device *dev)
94734749	113	{
d8ee4ea6	114	struct platform_device *pdev = to_platform_device(dev);
94734749	115	struct omap_device *od = to_omap_device(pdev);
5ae256dc	116	u8 idlemode;
94734749	117
5ae256dc SS	118	if (od->hwmods[0]->class->sysc->idlemodes & SIDLE_SMART_WKUP)
	119	idlemode = HWMOD_IDLEMODE_SMART_WKUP;
	120	else
	121	idlemode = HWMOD_IDLEMODE_SMART;
	122
	123	omap_hwmod_set_slave_idlemode(od->hwmods[0], idlemode);
94734749 G	124	}
94734749 G	125
4af4016c	126	#else
d8ee4ea6	127	static void omap_uart_enable_wakeup(struct device *dev, bool enable)
62f3ec5f	128	{}
d8ee4ea6 FB	129	static void omap_uart_set_noidle(struct device *dev) {}
d8ee4ea6 FB	130	static void omap_uart_set_smartidle(struct device *dev) {}
4af4016c KH	131	#endif /* CONFIG_PM */
4af4016c KH	132
7496ba30	133	#ifdef CONFIG_OMAP_MUX
91930652 G	134
	135	#define OMAP_UART_DEFAULT_PAD_NAME_LEN 28
	136	static char rx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN],
	137	tx_pad_name[OMAP_UART_DEFAULT_PAD_NAME_LEN] __initdata;
	138
	139	static void __init
	140	omap_serial_fill_uart_tx_rx_pads(struct omap_board_data *bdata,
	141	struct omap_uart_state *uart)
	142	{
	143	uart->default_omap_uart_pads[0].name = rx_pad_name;
	144	uart->default_omap_uart_pads[0].flags = OMAP_DEVICE_PAD_REMUX \|
	145	OMAP_DEVICE_PAD_WAKEUP;
	146	uart->default_omap_uart_pads[0].enable = OMAP_PIN_INPUT \|
	147	OMAP_MUX_MODE0;
	148	uart->default_omap_uart_pads[0].idle = OMAP_PIN_INPUT \| OMAP_MUX_MODE0;
	149	uart->default_omap_uart_pads[1].name = tx_pad_name;
	150	uart->default_omap_uart_pads[1].enable = OMAP_PIN_OUTPUT \|
	151	OMAP_MUX_MODE0;
	152	bdata->pads = uart->default_omap_uart_pads;
	153	bdata->pads_cnt = ARRAY_SIZE(uart->default_omap_uart_pads);
	154	}
	155
	156	static void __init omap_serial_check_wakeup(struct omap_board_data *bdata,
	157	struct omap_uart_state *uart)
7496ba30	158	{
91930652 G	159	struct omap_mux_partition tx_partition = NULL, rx_partition = NULL;
	160	struct omap_mux rx_mux = NULL, tx_mux = NULL;
	161	char rx_fmt, tx_fmt;
	162	int uart_nr = bdata->id + 1;
	163
	164	if (bdata->id != 2) {
	165	rx_fmt = "uart%d_rx.uart%d_rx";
	166	tx_fmt = "uart%d_tx.uart%d_tx";
	167	} else {
	168	rx_fmt = "uart%d_rx_irrx.uart%d_rx_irrx";
	169	tx_fmt = "uart%d_tx_irtx.uart%d_tx_irtx";
	170	}
	171
	172	snprintf(rx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, rx_fmt,
	173	uart_nr, uart_nr);
	174	snprintf(tx_pad_name, OMAP_UART_DEFAULT_PAD_NAME_LEN, tx_fmt,
	175	uart_nr, uart_nr);
	176
	177	if (omap_mux_get_by_name(rx_pad_name, &rx_partition, &rx_mux) >= 0 &&
	178	omap_mux_get_by_name
	179	(tx_pad_name, &tx_partition, &tx_mux) >= 0) {
	180	u16 tx_mode, rx_mode;
	181
	182	tx_mode = omap_mux_read(tx_partition, tx_mux->reg_offset);
	183	rx_mode = omap_mux_read(rx_partition, rx_mux->reg_offset);
	184
	185	/*
	186	* Check if uart is used in default tx/rx mode i.e. in mux mode0
	187	* if yes then configure rx pin for wake up capability
	188	*/
	189	if (OMAP_MODE_UART(rx_mode) && OMAP_MODE_UART(tx_mode))
	190	omap_serial_fill_uart_tx_rx_pads(bdata, uart);
	191	}
7496ba30 G	192	}
7496ba30 G	193	#else
91930652 G	194	static void __init omap_serial_check_wakeup(struct omap_board_data *bdata,
	195	struct omap_uart_state *uart)
	196	{
	197	}
7496ba30 G	198	#endif
7496ba30 G	199
8c3d4534	200	static char cmdline_find_option(char str)
8612bd22 G	201	{
	202	extern char *saved_command_line;
	203
	204	return strstr(saved_command_line, str);
	205	}
	206
3e16f925	207	static int __init omap_serial_early_init(void)
1dbae815	208	{
6f251e9d KH	209	do {
	210	char oh_name[MAX_UART_HWMOD_NAME_LEN];
	211	struct omap_hwmod *oh;
	212	struct omap_uart_state *uart;
8612bd22	213	char uart_name[MAX_UART_HWMOD_NAME_LEN];
21b90340	214
6f251e9d	215	snprintf(oh_name, MAX_UART_HWMOD_NAME_LEN,
969996a5	216	"uart%d", num_uarts + 1);
6f251e9d KH	217	oh = omap_hwmod_lookup(oh_name);
	218	if (!oh)
	219	break;
	220
	221	uart = kzalloc(sizeof(struct omap_uart_state), GFP_KERNEL);
	222	if (WARN_ON(!uart))
3e16f925	223	return -ENODEV;
1dbae815	224
6f251e9d	225	uart->oh = oh;
969996a5	226	uart->num = num_uarts++;
6f251e9d	227	list_add_tail(&uart->node, &uart_list);
8612bd22 G	228	snprintf(uart_name, MAX_UART_HWMOD_NAME_LEN,
	229	"%s%d", OMAP_SERIAL_NAME, uart->num);
	230
	231	if (cmdline_find_option(uart_name)) {
	232	console_uart_id = uart->num;
08f86b3e	233
36fc2d15 G	234	if (console_loglevel >= 10) {
36fc2d15 G	235	uart_debug = true;
7852ec05 PW	236	pr_info("%s used as console in debug mode: uart%d clocks will not be gated",
7852ec05 PW	237	uart_name, uart->num);
36fc2d15 G	238	}
36fc2d15 G	239
08f86b3e G	240	if (cmdline_find_option("no_console_suspend"))
	241	no_console_suspend = true;
	242
8612bd22 G	243	/*
	244	* omap-uart can be used for earlyprintk logs
	245	* So if omap-uart is used as console then prevent
	246	* uart reset and idle to get logs from omap-uart
	247	* until uart console driver is available to take
	248	* care for console messages.
	249	* Idling or resetting omap-uart while printing logs
	250	* early boot logs can stall the boot-up.
	251	*/
	252	oh->flags \|= HWMOD_INIT_NO_IDLE \| HWMOD_INIT_NO_RESET;
	253	}
6f251e9d	254	} while (1);
3e16f925 TL	255
3e16f925 TL	256	return 0;
b3c6df3a	257	}
3e16f925	258	core_initcall(omap_serial_early_init);
b3c6df3a	259
f62349ee MW	260	/**
f62349ee MW	261	* omap_serial_init_port() - initialize single serial port
40e44399	262	* @bdata: port specific board data pointer
c86845db	263	* @info: platform specific data pointer
f62349ee	264	*
40e44399	265	* This function initialies serial driver for given port only.
f62349ee MW	266	* Platforms can call this function instead of omap_serial_init()
	267	* if they don't plan to use all available UARTs as serial ports.
	268	*
	269	* Don't mix calls to omap_serial_init_port() and omap_serial_init(),
	270	* use only one of the two.
	271	*/
c86845db D	272	void __init omap_serial_init_port(struct omap_board_data *bdata,
c86845db D	273	struct omap_uart_port_info *info)
b3c6df3a	274	{
f62349ee	275	struct omap_uart_state *uart;
6f251e9d	276	struct omap_hwmod *oh;
3528c58e	277	struct platform_device *pdev;
6f251e9d KH	278	void *pdata = NULL;
	279	u32 pdata_size = 0;
	280	char *name;
6f251e9d	281	struct omap_uart_port_info omap_up;
970a724d	282
40e44399	283	if (WARN_ON(!bdata))
6f251e9d	284	return;
40e44399 TL	285	if (WARN_ON(bdata->id < 0))
	286	return;
	287	if (WARN_ON(bdata->id >= num_uarts))
e88d556d	288	return;
f62349ee	289
6f251e9d	290	list_for_each_entry(uart, &uart_list, node)
40e44399	291	if (bdata->id == uart->num)
6f251e9d	292	break;
c86845db D	293	if (!info)
c86845db D	294	info = omap_serial_default_info;
f2eeeae0	295
6f251e9d	296	oh = uart->oh;
6f251e9d KH	297	name = DRIVER_NAME;
6f251e9d KH	298
c86845db	299	omap_up.dma_enabled = info->dma_enabled;
6f251e9d	300	omap_up.uartclk = OMAP24XX_BASE_BAUD * 16;
273558b3	301	omap_up.flags = UPF_BOOT_AUTOCONF;
ec3bebc6	302	omap_up.get_context_loss_count = omap_pm_get_dev_context_loss_count;
be4b0281	303	omap_up.set_forceidle = omap_uart_set_smartidle;
94734749	304	omap_up.set_noidle = omap_uart_set_noidle;
62f3ec5f	305	omap_up.enable_wakeup = omap_uart_enable_wakeup;
c86845db D	306	omap_up.dma_rx_buf_size = info->dma_rx_buf_size;
c86845db D	307	omap_up.dma_rx_timeout = info->dma_rx_timeout;
a9e210e0	308	omap_up.dma_rx_poll_rate = info->dma_rx_poll_rate;
c86845db	309	omap_up.autosuspend_timeout = info->autosuspend_timeout;
9574f36f N	310	omap_up.DTR_gpio = info->DTR_gpio;
	311	omap_up.DTR_inverted = info->DTR_inverted;
	312	omap_up.DTR_present = info->DTR_present;
94734749	313
6f251e9d KH	314	pdata = &omap_up;
6f251e9d KH	315	pdata_size = sizeof(struct omap_uart_port_info);
6f251e9d KH	316
	317	if (WARN_ON(!oh))
	318	return;
	319
3528c58e	320	pdev = omap_device_build(name, uart->num, oh, pdata, pdata_size,
f718e2c0	321	NULL, 0, false);
a032d33b PW	322	if (IS_ERR(pdev)) {
	323	WARN(1, "Could not build omap_device for %s: %s.\n", name,
	324	oh->name);
	325	return;
	326	}
6f251e9d	327
08f86b3e G	328	if ((console_uart_id == bdata->id) && no_console_suspend)
	329	omap_device_disable_idle_on_suspend(pdev);
	330
40e44399 TL	331	oh->mux = omap_hwmod_mux_init(bdata->pads, bdata->pads_cnt);
40e44399 TL	332
44b1d42a KH	333	if (console_uart_id == bdata->id) {
	334	omap_device_enable(pdev);
	335	pm_runtime_set_active(&pdev->dev);
	336	}
	337
6f251e9d KH	338	oh->dev_attr = uart;
6f251e9d KH	339
36fc2d15 G	340	if (((cpu_is_omap34xx() \|\| cpu_is_omap44xx()) && bdata->pads)
36fc2d15 G	341	&& !uart_debug)
3528c58e	342	device_init_wakeup(&pdev->dev, true);
f62349ee MW	343	}
	344
	345	/**
c86845db D	346	* omap_serial_board_init() - initialize all supported serial ports
c86845db D	347	* @info: platform specific data pointer
f62349ee MW	348	*
	349	* Initializes all available UARTs as serial ports. Platforms
	350	* can call this function when they want to have default behaviour
	351	* for serial ports (e.g initialize them all as serial ports).
	352	*/
c86845db	353	void __init omap_serial_board_init(struct omap_uart_port_info *info)
f62349ee	354	{
6f251e9d	355	struct omap_uart_state *uart;
40e44399	356	struct omap_board_data bdata;
f62349ee	357
40e44399 TL	358	list_for_each_entry(uart, &uart_list, node) {
	359	bdata.id = uart->num;
	360	bdata.flags = 0;
	361	bdata.pads = NULL;
	362	bdata.pads_cnt = 0;
7496ba30	363
91930652	364	omap_serial_check_wakeup(&bdata, uart);
7496ba30	365
c86845db D	366	if (!info)
	367	omap_serial_init_port(&bdata, NULL);
	368	else
	369	omap_serial_init_port(&bdata, &info[uart->num]);
40e44399	370	}
1dbae815	371	}
c86845db D	372
	373	/**
	374	* omap_serial_init() - initialize all supported serial ports
	375	*
	376	* Initializes all available UARTs.
	377	* Platforms can call this function when they want to have default behaviour
	378	* for serial ports (e.g initialize them all as serial ports).
	379	*/
	380	void __init omap_serial_init(void)
	381	{
	382	omap_serial_board_init(NULL);
	383	}