[mirror_ubuntu-bionic-kernel.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 <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;
	int can_sleep;

	struct list_head node;
	struct omap_hwmod *oh;
	struct platform_device *pdev;
};

static LIST_HEAD(uart_list);
static u8 num_uarts;
static u8 console_uart_id = -1;
static u8 no_console_suspend;

#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

int omap_uart_can_sleep(void)
{
	struct omap_uart_state *uart;
	int can_sleep = 1;

	list_for_each_entry(uart, &uart_list, node) {
		if (!uart->clocked)
			continue;

		if (!uart->can_sleep) {
			can_sleep = 0;
			continue;
		}

		/* This UART can now safely sleep. */
		omap_uart_allow_sleep(uart);
	}

	return can_sleep;
}

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_forceidle(struct platform_device *pdev)
{
	struct omap_device *od = to_omap_device(pdev);

	omap_hwmod_set_slave_idlemode(od->hwmods[0], HWMOD_IDLEMODE_FORCE);
}

#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_forceidle(struct platform_device *pdev) {}
#endif /* CONFIG_PM */

#ifdef CONFIG_OMAP_MUX
static struct omap_device_pad default_uart1_pads[] __initdata = {
	{
		.name	= "uart1_cts.uart1_cts",
		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
	},
	{
		.name	= "uart1_rts.uart1_rts",
		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
	},
	{
		.name	= "uart1_tx.uart1_tx",
		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
	},
	{
		.name	= "uart1_rx.uart1_rx",
		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
		.idle	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
	},
};

static struct omap_device_pad default_uart2_pads[] __initdata = {
	{
		.name	= "uart2_cts.uart2_cts",
		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
	},
	{
		.name	= "uart2_rts.uart2_rts",
		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
	},
	{
		.name	= "uart2_tx.uart2_tx",
		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
	},
	{
		.name	= "uart2_rx.uart2_rx",
		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
		.idle	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
	},
};

static struct omap_device_pad default_uart3_pads[] __initdata = {
	{
		.name	= "uart3_cts_rctx.uart3_cts_rctx",
		.enable	= OMAP_PIN_INPUT_PULLUP | OMAP_MUX_MODE0,
	},
	{
		.name	= "uart3_rts_sd.uart3_rts_sd",
		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
	},
	{
		.name	= "uart3_tx_irtx.uart3_tx_irtx",
		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
	},
	{
		.name	= "uart3_rx_irrx.uart3_rx_irrx",
		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
		.enable	= OMAP_PIN_INPUT | OMAP_MUX_MODE0,
		.idle	= OMAP_PIN_INPUT | OMAP_MUX_MODE0,
	},
};

static struct omap_device_pad default_omap36xx_uart4_pads[] __initdata = {
	{
		.name   = "gpmc_wait2.uart4_tx",
		.enable = OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
	},
	{
		.name	= "gpmc_wait3.uart4_rx",
		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
		.enable	= OMAP_PIN_INPUT | OMAP_MUX_MODE2,
		.idle	= OMAP_PIN_INPUT | OMAP_MUX_MODE2,
	},
};

static struct omap_device_pad default_omap4_uart4_pads[] __initdata = {
	{
		.name	= "uart4_tx.uart4_tx",
		.enable	= OMAP_PIN_OUTPUT | OMAP_MUX_MODE0,
	},
	{
		.name	= "uart4_rx.uart4_rx",
		.flags	= OMAP_DEVICE_PAD_REMUX | OMAP_DEVICE_PAD_WAKEUP,
		.enable	= OMAP_PIN_INPUT | OMAP_MUX_MODE0,
		.idle	= OMAP_PIN_INPUT | OMAP_MUX_MODE0,
	},
};

static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
{
	switch (bdata->id) {
	case 0:
		bdata->pads = default_uart1_pads;
		bdata->pads_cnt = ARRAY_SIZE(default_uart1_pads);
		break;
	case 1:
		bdata->pads = default_uart2_pads;
		bdata->pads_cnt = ARRAY_SIZE(default_uart2_pads);
		break;
	case 2:
		bdata->pads = default_uart3_pads;
		bdata->pads_cnt = ARRAY_SIZE(default_uart3_pads);
		break;
	case 3:
		if (cpu_is_omap44xx()) {
			bdata->pads = default_omap4_uart4_pads;
			bdata->pads_cnt =
				ARRAY_SIZE(default_omap4_uart4_pads);
		} else if (cpu_is_omap3630()) {
			bdata->pads = default_omap36xx_uart4_pads;
			bdata->pads_cnt =
				ARRAY_SIZE(default_omap36xx_uart4_pads);
		}
		break;
	default:
		break;
	}
}
#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 (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_forceidle;
	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);

	uart->pdev = pdev;

	oh->dev_attr = uart;

	if ((cpu_is_omap34xx() || cpu_is_omap44xx()) && bdata->pads)
		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);
}
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>
6f251e9d	29
6f251e9d	30	#include <plat/omap-serial.h>
4e65331c	31	#include "common.h"
ce491cf8	32	#include <plat/board.h>
6f251e9d KH	33	#include <plat/dma.h>
	34	#include <plat/omap_hwmod.h>
	35	#include <plat/omap_device.h>
ec3bebc6	36	#include <plat/omap-pm.h>
4af4016c	37
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"
4af4016c	44
301fe8ee	45	/*
c86845db D	46	* NOTE: By default the serial auto_suspend timeout is disabled as it causes
	47	* lost characters over the serial ports. This means that the UART clocks will
	48	* stay on until power/autosuspend_delay is set for the uart from sysfs.
	49	* This also causes that any deeper omap sleep states are blocked.
301fe8ee	50	*/
c86845db	51	#define DEFAULT_AUTOSUSPEND_DELAY -1
4af4016c	52
6f251e9d KH	53	#define MAX_UART_HWMOD_NAME_LEN 16
6f251e9d KH	54
4af4016c KH	55	struct omap_uart_state {
	56	int num;
	57	int can_sleep;
4af4016c	58
4af4016c	59	struct list_head node;
6f251e9d KH	60	struct omap_hwmod *oh;
6f251e9d KH	61	struct platform_device *pdev;
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;
1dbae815	68
a9e210e0	69	#define DEFAULT_RXDMA_POLLRATE 1 /* RX DMA polling rate (us) */
c86845db	70	#define DEFAULT_RXDMA_BUFSIZE 4096 /* RX DMA buffer size */
a9e210e0	71	#define DEFAULT_RXDMA_TIMEOUT (3 * HZ)/* RX DMA timeout (jiffies) */
c86845db D	72
	73	static struct omap_uart_port_info omap_serial_default_info[] __initdata = {
	74	{
	75	.dma_enabled = false,
	76	.dma_rx_buf_size = DEFAULT_RXDMA_BUFSIZE,
a9e210e0	77	.dma_rx_poll_rate = DEFAULT_RXDMA_POLLRATE,
c86845db D	78	.dma_rx_timeout = DEFAULT_RXDMA_TIMEOUT,
	79	.autosuspend_timeout = DEFAULT_AUTOSUSPEND_DELAY,
	80	},
	81	};
	82
4af4016c KH	83	#ifdef CONFIG_PM
4af4016c KH	84
4af4016c KH	85	int omap_uart_can_sleep(void)
	86	{
	87	struct omap_uart_state *uart;
	88	int can_sleep = 1;
	89
	90	list_for_each_entry(uart, &uart_list, node) {
	91	if (!uart->clocked)
	92	continue;
	93
	94	if (!uart->can_sleep) {
	95	can_sleep = 0;
	96	continue;
6e81176d	97	}
4af4016c KH	98
	99	/* This UART can now safely sleep. */
	100	omap_uart_allow_sleep(uart);
6e81176d	101	}
4af4016c KH	102
4af4016c KH	103	return can_sleep;
6e81176d JH	104	}
6e81176d JH	105
62f3ec5f	106	static void omap_uart_enable_wakeup(struct platform_device *pdev, bool enable)
4af4016c	107	{
62f3ec5f	108	struct omap_device *od = to_omap_device(pdev);
4af4016c	109
62f3ec5f G	110	if (!od)
62f3ec5f G	111	return;
4af4016c	112
62f3ec5f G	113	if (enable)
	114	omap_hwmod_enable_wakeup(od->hwmods[0]);
	115	else
	116	omap_hwmod_disable_wakeup(od->hwmods[0]);
ba87a9be JH	117	}
ba87a9be JH	118
94734749 G	119	/*
	120	* Errata i291: [UART]:Cannot Acknowledge Idle Requests
	121	* in Smartidle Mode When Configured for DMA Operations.
	122	* WA: configure uart in force idle mode.
	123	*/
	124	static void omap_uart_set_noidle(struct platform_device *pdev)
	125	{
	126	struct omap_device *od = to_omap_device(pdev);
	127
	128	omap_hwmod_set_slave_idlemode(od->hwmods[0], HWMOD_IDLEMODE_NO);
	129	}
	130
	131	static void omap_uart_set_forceidle(struct platform_device *pdev)
	132	{
	133	struct omap_device *od = to_omap_device(pdev);
	134
	135	omap_hwmod_set_slave_idlemode(od->hwmods[0], HWMOD_IDLEMODE_FORCE);
	136	}
	137
4af4016c	138	#else
62f3ec5f G	139	static void omap_uart_enable_wakeup(struct platform_device *pdev, bool enable)
62f3ec5f G	140	{}
94734749 G	141	static void omap_uart_set_noidle(struct platform_device *pdev) {}
94734749 G	142	static void omap_uart_set_forceidle(struct platform_device *pdev) {}
4af4016c KH	143	#endif /* CONFIG_PM */
4af4016c KH	144
7496ba30 G	145	#ifdef CONFIG_OMAP_MUX
	146	static struct omap_device_pad default_uart1_pads[] __initdata = {
	147	{
	148	.name = "uart1_cts.uart1_cts",
	149	.enable = OMAP_PIN_INPUT_PULLUP \| OMAP_MUX_MODE0,
	150	},
	151	{
	152	.name = "uart1_rts.uart1_rts",
	153	.enable = OMAP_PIN_OUTPUT \| OMAP_MUX_MODE0,
	154	},
	155	{
	156	.name = "uart1_tx.uart1_tx",
	157	.enable = OMAP_PIN_OUTPUT \| OMAP_MUX_MODE0,
	158	},
	159	{
	160	.name = "uart1_rx.uart1_rx",
	161	.flags = OMAP_DEVICE_PAD_REMUX \| OMAP_DEVICE_PAD_WAKEUP,
	162	.enable = OMAP_PIN_INPUT_PULLUP \| OMAP_MUX_MODE0,
	163	.idle = OMAP_PIN_INPUT_PULLUP \| OMAP_MUX_MODE0,
	164	},
	165	};
	166
	167	static struct omap_device_pad default_uart2_pads[] __initdata = {
	168	{
	169	.name = "uart2_cts.uart2_cts",
	170	.enable = OMAP_PIN_INPUT_PULLUP \| OMAP_MUX_MODE0,
	171	},
	172	{
	173	.name = "uart2_rts.uart2_rts",
	174	.enable = OMAP_PIN_OUTPUT \| OMAP_MUX_MODE0,
	175	},
	176	{
	177	.name = "uart2_tx.uart2_tx",
	178	.enable = OMAP_PIN_OUTPUT \| OMAP_MUX_MODE0,
	179	},
	180	{
	181	.name = "uart2_rx.uart2_rx",
	182	.flags = OMAP_DEVICE_PAD_REMUX \| OMAP_DEVICE_PAD_WAKEUP,
	183	.enable = OMAP_PIN_INPUT_PULLUP \| OMAP_MUX_MODE0,
	184	.idle = OMAP_PIN_INPUT_PULLUP \| OMAP_MUX_MODE0,
	185	},
	186	};
	187
	188	static struct omap_device_pad default_uart3_pads[] __initdata = {
	189	{
	190	.name = "uart3_cts_rctx.uart3_cts_rctx",
	191	.enable = OMAP_PIN_INPUT_PULLUP \| OMAP_MUX_MODE0,
	192	},
	193	{
	194	.name = "uart3_rts_sd.uart3_rts_sd",
	195	.enable = OMAP_PIN_OUTPUT \| OMAP_MUX_MODE0,
	196	},
	197	{
	198	.name = "uart3_tx_irtx.uart3_tx_irtx",
	199	.enable = OMAP_PIN_OUTPUT \| OMAP_MUX_MODE0,
	200	},
	201	{
	202	.name = "uart3_rx_irrx.uart3_rx_irrx",
	203	.flags = OMAP_DEVICE_PAD_REMUX \| OMAP_DEVICE_PAD_WAKEUP,
	204	.enable = OMAP_PIN_INPUT \| OMAP_MUX_MODE0,
	205	.idle = OMAP_PIN_INPUT \| OMAP_MUX_MODE0,
	206	},
	207	};
	208
209	static struct omap_device_pad default_omap36xx_uart4_pads[] __initdata = {
210	{
211	.name = "gpmc_wait2.uart4_tx",
212	.enable = OMAP_PIN_OUTPUT \| OMAP_MUX_MODE0,
213	},
214	{
215	.name = "gpmc_wait3.uart4_rx",
216	.flags = OMAP_DEVICE_PAD_REMUX \| OMAP_DEVICE_PAD_WAKEUP,
217	.enable = OMAP_PIN_INPUT \| OMAP_MUX_MODE2,
218	.idle = OMAP_PIN_INPUT \| OMAP_MUX_MODE2,
219	},
220	};
221
222	static struct omap_device_pad default_omap4_uart4_pads[] __initdata = {
223	{
224	.name = "uart4_tx.uart4_tx",
225	.enable = OMAP_PIN_OUTPUT \| OMAP_MUX_MODE0,
226	},
227	{
228	.name = "uart4_rx.uart4_rx",
229	.flags = OMAP_DEVICE_PAD_REMUX \| OMAP_DEVICE_PAD_WAKEUP,
230	.enable = OMAP_PIN_INPUT \| OMAP_MUX_MODE0,
231	.idle = OMAP_PIN_INPUT \| OMAP_MUX_MODE0,
232	},
233	};
234
235	static void omap_serial_fill_default_pads(struct omap_board_data *bdata)
236	{
237	switch (bdata->id) {
238	case 0:
239	bdata->pads = default_uart1_pads;
240	bdata->pads_cnt = ARRAY_SIZE(default_uart1_pads);
241	break;
242	case 1:
243	bdata->pads = default_uart2_pads;
244	bdata->pads_cnt = ARRAY_SIZE(default_uart2_pads);
245	break;
246	case 2:
247	bdata->pads = default_uart3_pads;
248	bdata->pads_cnt = ARRAY_SIZE(default_uart3_pads);
249	break;
250	case 3:
251	if (cpu_is_omap44xx()) {
252	bdata->pads = default_omap4_uart4_pads;
253	bdata->pads_cnt =
254	ARRAY_SIZE(default_omap4_uart4_pads);
255	} else if (cpu_is_omap3630()) {
256	bdata->pads = default_omap36xx_uart4_pads;
257	bdata->pads_cnt =
258	ARRAY_SIZE(default_omap36xx_uart4_pads);
259	}
260	break;
261	default:
262	break;
263	}
264	}
265	#else
266	static void omap_serial_fill_default_pads(struct omap_board_data *bdata) {}
267	#endif
268
8612bd22 G	269	char cmdline_find_option(char str)
	270	{
	271	extern char *saved_command_line;
	272
	273	return strstr(saved_command_line, str);
	274	}
	275
3e16f925	276	static int __init omap_serial_early_init(void)
1dbae815	277	{
6f251e9d KH	278	do {
	279	char oh_name[MAX_UART_HWMOD_NAME_LEN];
	280	struct omap_hwmod *oh;
	281	struct omap_uart_state *uart;
8612bd22	282	char uart_name[MAX_UART_HWMOD_NAME_LEN];
21b90340	283
6f251e9d	284	snprintf(oh_name, MAX_UART_HWMOD_NAME_LEN,
969996a5	285	"uart%d", num_uarts + 1);
6f251e9d KH	286	oh = omap_hwmod_lookup(oh_name);
	287	if (!oh)
	288	break;
	289
	290	uart = kzalloc(sizeof(struct omap_uart_state), GFP_KERNEL);
	291	if (WARN_ON(!uart))
3e16f925	292	return -ENODEV;
1dbae815	293
6f251e9d	294	uart->oh = oh;
969996a5	295	uart->num = num_uarts++;
6f251e9d	296	list_add_tail(&uart->node, &uart_list);
8612bd22 G	297	snprintf(uart_name, MAX_UART_HWMOD_NAME_LEN,
	298	"%s%d", OMAP_SERIAL_NAME, uart->num);
	299
	300	if (cmdline_find_option(uart_name)) {
	301	console_uart_id = uart->num;
08f86b3e G	302
	303	if (cmdline_find_option("no_console_suspend"))
	304	no_console_suspend = true;
	305
8612bd22 G	306	/*
	307	* omap-uart can be used for earlyprintk logs
	308	* So if omap-uart is used as console then prevent
	309	* uart reset and idle to get logs from omap-uart
	310	* until uart console driver is available to take
	311	* care for console messages.
	312	* Idling or resetting omap-uart while printing logs
	313	* early boot logs can stall the boot-up.
	314	*/
	315	oh->flags \|= HWMOD_INIT_NO_IDLE \| HWMOD_INIT_NO_RESET;
	316	}
6f251e9d	317	} while (1);
3e16f925 TL	318
3e16f925 TL	319	return 0;
b3c6df3a	320	}
3e16f925	321	core_initcall(omap_serial_early_init);
b3c6df3a	322
f62349ee MW	323	/**
f62349ee MW	324	* omap_serial_init_port() - initialize single serial port
40e44399	325	* @bdata: port specific board data pointer
c86845db	326	* @info: platform specific data pointer
f62349ee	327	*
40e44399	328	* This function initialies serial driver for given port only.
f62349ee MW	329	* Platforms can call this function instead of omap_serial_init()
	330	* if they don't plan to use all available UARTs as serial ports.
	331	*
	332	* Don't mix calls to omap_serial_init_port() and omap_serial_init(),
	333	* use only one of the two.
	334	*/
c86845db D	335	void __init omap_serial_init_port(struct omap_board_data *bdata,
c86845db D	336	struct omap_uart_port_info *info)
b3c6df3a	337	{
f62349ee	338	struct omap_uart_state *uart;
6f251e9d	339	struct omap_hwmod *oh;
3528c58e	340	struct platform_device *pdev;
6f251e9d KH	341	void *pdata = NULL;
	342	u32 pdata_size = 0;
	343	char *name;
6f251e9d	344	struct omap_uart_port_info omap_up;
970a724d	345
40e44399	346	if (WARN_ON(!bdata))
6f251e9d	347	return;
40e44399 TL	348	if (WARN_ON(bdata->id < 0))
	349	return;
	350	if (WARN_ON(bdata->id >= num_uarts))
e88d556d	351	return;
f62349ee	352
6f251e9d	353	list_for_each_entry(uart, &uart_list, node)
40e44399	354	if (bdata->id == uart->num)
6f251e9d	355	break;
c86845db D	356	if (!info)
c86845db D	357	info = omap_serial_default_info;
f2eeeae0	358
6f251e9d	359	oh = uart->oh;
6f251e9d KH	360	name = DRIVER_NAME;
6f251e9d KH	361
c86845db	362	omap_up.dma_enabled = info->dma_enabled;
6f251e9d	363	omap_up.uartclk = OMAP24XX_BASE_BAUD * 16;
273558b3	364	omap_up.flags = UPF_BOOT_AUTOCONF;
ec3bebc6	365	omap_up.get_context_loss_count = omap_pm_get_dev_context_loss_count;
94734749 G	366	omap_up.set_forceidle = omap_uart_set_forceidle;
94734749 G	367	omap_up.set_noidle = omap_uart_set_noidle;
62f3ec5f	368	omap_up.enable_wakeup = omap_uart_enable_wakeup;
c86845db D	369	omap_up.dma_rx_buf_size = info->dma_rx_buf_size;
c86845db D	370	omap_up.dma_rx_timeout = info->dma_rx_timeout;
a9e210e0	371	omap_up.dma_rx_poll_rate = info->dma_rx_poll_rate;
c86845db	372	omap_up.autosuspend_timeout = info->autosuspend_timeout;
94734749 G	373
	374	/* Enable the MDR1 Errata i202 for OMAP2430/3xxx/44xx */
	375	if (!cpu_is_omap2420() && !cpu_is_ti816x())
	376	omap_up.errata \|= UART_ERRATA_i202_MDR1_ACCESS;
	377
	378	/* Enable DMA Mode Force Idle Errata i291 for omap34xx/3630 */
	379	if (cpu_is_omap34xx() \|\| cpu_is_omap3630())
	380	omap_up.errata \|= UART_ERRATA_i291_DMA_FORCEIDLE;
6f251e9d KH	381
	382	pdata = &omap_up;
	383	pdata_size = sizeof(struct omap_uart_port_info);
6f251e9d KH	384
	385	if (WARN_ON(!oh))
	386	return;
	387
3528c58e	388	pdev = omap_device_build(name, uart->num, oh, pdata, pdata_size,
f718e2c0	389	NULL, 0, false);
3528c58e	390	WARN(IS_ERR(pdev), "Could not build omap_device for %s: %s.\n",
6f251e9d KH	391	name, oh->name);
6f251e9d KH	392
08f86b3e G	393	if ((console_uart_id == bdata->id) && no_console_suspend)
	394	omap_device_disable_idle_on_suspend(pdev);
	395
40e44399 TL	396	oh->mux = omap_hwmod_mux_init(bdata->pads, bdata->pads_cnt);
40e44399 TL	397
3528c58e	398	uart->pdev = pdev;
6f251e9d KH	399
	400	oh->dev_attr = uart;
	401
62f3ec5f	402	if ((cpu_is_omap34xx() \|\| cpu_is_omap44xx()) && bdata->pads)
3528c58e	403	device_init_wakeup(&pdev->dev, true);
f62349ee MW	404	}
	405
	406	/**
c86845db D	407	* omap_serial_board_init() - initialize all supported serial ports
c86845db D	408	* @info: platform specific data pointer
f62349ee MW	409	*
	410	* Initializes all available UARTs as serial ports. Platforms
	411	* can call this function when they want to have default behaviour
	412	* for serial ports (e.g initialize them all as serial ports).
	413	*/
c86845db	414	void __init omap_serial_board_init(struct omap_uart_port_info *info)
f62349ee	415	{
6f251e9d	416	struct omap_uart_state *uart;
40e44399	417	struct omap_board_data bdata;
f62349ee	418
40e44399 TL	419	list_for_each_entry(uart, &uart_list, node) {
	420	bdata.id = uart->num;
	421	bdata.flags = 0;
	422	bdata.pads = NULL;
	423	bdata.pads_cnt = 0;
7496ba30 G	424
	425	if (cpu_is_omap44xx() \|\| cpu_is_omap34xx())
	426	omap_serial_fill_default_pads(&bdata);
	427
c86845db D	428	if (!info)
	429	omap_serial_init_port(&bdata, NULL);
	430	else
	431	omap_serial_init_port(&bdata, &info[uart->num]);
40e44399	432	}
1dbae815	433	}
c86845db D	434
	435	/**
	436	* omap_serial_init() - initialize all supported serial ports
	437	*
	438	* Initializes all available UARTs.
	439	* Platforms can call this function when they want to have default behaviour
	440	* for serial ports (e.g initialize them all as serial ports).
	441	*/
	442	void __init omap_serial_init(void)
	443	{
	444	omap_serial_board_init(NULL);
	445	}