[deliverable/linux.git] / arch / arm / mach-omap1 / serial.c

/*
 * linux/arch/arm/mach-omap1/serial.c
 *
 * OMAP1 serial support.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/irq.h>
#include <linux/delay.h>
#include <linux/serial.h>
#include <linux/tty.h>
#include <linux/serial_8250.h>
#include <linux/serial_reg.h>
#include <linux/clk.h>
#include <linux/io.h>

#include <asm/mach-types.h>

#include <plat/board.h>
#include <plat/mux.h>
#include <mach/gpio.h>
#include <plat/fpga.h>

#include "pm.h"

static struct clk * uart1_ck;
static struct clk * uart2_ck;
static struct clk * uart3_ck;

static inline unsigned int omap_serial_in(struct plat_serial8250_port *up,
					  int offset)
{
	offset <<= up->regshift;
	return (unsigned int)__raw_readb(up->membase + offset);
}

static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset,
				    int value)
{
	offset <<= p->regshift;
	__raw_writeb(value, p->membase + offset);
}

/*
 * Internal UARTs need to be initialized for the 8250 autoconfig to work
 * properly. Note that the TX watermark initialization may not be needed
 * once the 8250.c watermark handling code is merged.
 */
static void __init omap_serial_reset(struct plat_serial8250_port *p)
{
	omap_serial_outp(p, UART_OMAP_MDR1,
			UART_OMAP_MDR1_DISABLE);	/* disable UART */
	omap_serial_outp(p, UART_OMAP_SCR, 0x08);	/* TX watermark */
	omap_serial_outp(p, UART_OMAP_MDR1,
			UART_OMAP_MDR1_16X_MODE);	/* enable UART */

	if (!cpu_is_omap15xx()) {
		omap_serial_outp(p, UART_OMAP_SYSC, 0x01);
		while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01));
	}
}

static struct plat_serial8250_port serial_platform_data[] = {
	{
		.mapbase	= OMAP1_UART1_BASE,
		.irq		= INT_UART1,
		.flags		= UPF_BOOT_AUTOCONF,
		.iotype		= UPIO_MEM,
		.regshift	= 2,
		.uartclk	= OMAP16XX_BASE_BAUD * 16,
	},
	{
		.mapbase	= OMAP1_UART2_BASE,
		.irq		= INT_UART2,
		.flags		= UPF_BOOT_AUTOCONF,
		.iotype		= UPIO_MEM,
		.regshift	= 2,
		.uartclk	= OMAP16XX_BASE_BAUD * 16,
	},
	{
		.mapbase	= OMAP1_UART3_BASE,
		.irq		= INT_UART3,
		.flags		= UPF_BOOT_AUTOCONF,
		.iotype		= UPIO_MEM,
		.regshift	= 2,
		.uartclk	= OMAP16XX_BASE_BAUD * 16,
	},
	{ },
};

static struct platform_device serial_device = {
	.name			= "serial8250",
	.id			= PLAT8250_DEV_PLATFORM,
	.dev			= {
		.platform_data	= serial_platform_data,
	},
};

/*
 * Note that on Innovator-1510 UART2 pins conflict with USB2.
 * By default UART2 does not work on Innovator-1510 if you have
 * USB OHCI enabled. To use UART2, you must disable USB2 first.
 */
void __init omap_serial_init(void)
{
	int i;

	if (cpu_is_omap7xx()) {
		serial_platform_data[0].regshift = 0;
		serial_platform_data[1].regshift = 0;
		serial_platform_data[0].irq = INT_7XX_UART_MODEM_1;
		serial_platform_data[1].irq = INT_7XX_UART_MODEM_IRDA_2;
	}

	if (cpu_is_omap15xx()) {
		serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16;
		serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16;
		serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16;
	}

	for (i = 0; i < ARRAY_SIZE(serial_platform_data) - 1; i++) {

		/* Don't look at UARTs higher than 2 for omap7xx */
		if (cpu_is_omap7xx() && i > 1) {
			serial_platform_data[i].membase = NULL;
			serial_platform_data[i].mapbase = 0;
			continue;
		}

		/* Static mapping, never released */
		serial_platform_data[i].membase =
			ioremap(serial_platform_data[i].mapbase, SZ_2K);
		if (!serial_platform_data[i].membase) {
			printk(KERN_ERR "Could not ioremap uart%i\n", i);
			continue;
		}
		switch (i) {
		case 0:
			uart1_ck = clk_get(NULL, "uart1_ck");
			if (IS_ERR(uart1_ck))
				printk("Could not get uart1_ck\n");
			else {
				clk_enable(uart1_ck);
				if (cpu_is_omap15xx())
					clk_set_rate(uart1_ck, 12000000);
			}
			break;
		case 1:
			uart2_ck = clk_get(NULL, "uart2_ck");
			if (IS_ERR(uart2_ck))
				printk("Could not get uart2_ck\n");
			else {
				clk_enable(uart2_ck);
				if (cpu_is_omap15xx())
					clk_set_rate(uart2_ck, 12000000);
				else
					clk_set_rate(uart2_ck, 48000000);
			}
			break;
		case 2:
			uart3_ck = clk_get(NULL, "uart3_ck");
			if (IS_ERR(uart3_ck))
				printk("Could not get uart3_ck\n");
			else {
				clk_enable(uart3_ck);
				if (cpu_is_omap15xx())
					clk_set_rate(uart3_ck, 12000000);
			}
			break;
		}
		omap_serial_reset(&serial_platform_data[i]);
	}
}

#ifdef CONFIG_OMAP_SERIAL_WAKE

static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id)
{
	/* Need to do something with serial port right after wake-up? */
	return IRQ_HANDLED;
}

/*
 * Reroutes serial RX lines to GPIO lines for the duration of
 * sleep to allow waking up the device from serial port even
 * in deep sleep.
 */
void omap_serial_wake_trigger(int enable)
{
	if (!cpu_is_omap16xx())
		return;

	if (uart1_ck != NULL) {
		if (enable)
			omap_cfg_reg(V14_16XX_GPIO37);
		else
			omap_cfg_reg(V14_16XX_UART1_RX);
	}
	if (uart2_ck != NULL) {
		if (enable)
			omap_cfg_reg(R9_16XX_GPIO18);
		else
			omap_cfg_reg(R9_16XX_UART2_RX);
	}
	if (uart3_ck != NULL) {
		if (enable)
			omap_cfg_reg(L14_16XX_GPIO49);
		else
			omap_cfg_reg(L14_16XX_UART3_RX);
	}
}

static void __init omap_serial_set_port_wakeup(int gpio_nr)
{
	int ret;

	ret = gpio_request(gpio_nr, "UART wake");
	if (ret < 0) {
		printk(KERN_ERR "Could not request UART wake GPIO: %i\n",
		       gpio_nr);
		return;
	}
	gpio_direction_input(gpio_nr);
	ret = request_irq(gpio_to_irq(gpio_nr), &omap_serial_wake_interrupt,
			  IRQF_TRIGGER_RISING, "serial wakeup", NULL);
	if (ret) {
		gpio_free(gpio_nr);
		printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n",
		       gpio_nr);
		return;
	}
	enable_irq_wake(gpio_to_irq(gpio_nr));
}

static int __init omap_serial_wakeup_init(void)
{
	if (!cpu_is_omap16xx())
		return 0;

	if (uart1_ck != NULL)
		omap_serial_set_port_wakeup(37);
	if (uart2_ck != NULL)
		omap_serial_set_port_wakeup(18);
	if (uart3_ck != NULL)
		omap_serial_set_port_wakeup(49);

	return 0;
}
late_initcall(omap_serial_wakeup_init);

#endif	/* CONFIG_OMAP_SERIAL_WAKE */

static int __init omap_init(void)
{
	if (!cpu_class_is_omap1())
		return -ENODEV;

	return platform_device_register(&serial_device);
}
arch_initcall(omap_init);
Commit	Line	Data
f577ffd7	1	/*
f30c2269	2	* linux/arch/arm/mach-omap1/serial.c
f577ffd7	3	*
65d873ca	4	* OMAP1 serial support.
f577ffd7 TL	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
	10
f577ffd7 TL	11	#include <linux/module.h>
	12	#include <linux/kernel.h>
	13	#include <linux/init.h>
d533c128	14	#include <linux/irq.h>
f577ffd7 TL	15	#include <linux/delay.h>
	16	#include <linux/serial.h>
	17	#include <linux/tty.h>
	18	#include <linux/serial_8250.h>
	19	#include <linux/serial_reg.h>
f8ce2547	20	#include <linux/clk.h>
fced80c7	21	#include <linux/io.h>
f577ffd7	22
f577ffd7	23	#include <asm/mach-types.h>
f577ffd7	24
ce491cf8 TL	25	#include <plat/board.h>
ce491cf8 TL	26	#include <plat/mux.h>
a09e64fb	27	#include <mach/gpio.h>
ce491cf8	28	#include <plat/fpga.h>
f577ffd7	29
706afdda AK	30	#include "pm.h"
706afdda AK	31
120db2cb TL	32	static struct clk * uart1_ck;
	33	static struct clk * uart2_ck;
	34	static struct clk * uart3_ck;
f577ffd7 TL	35
	36	static inline unsigned int omap_serial_in(struct plat_serial8250_port *up,
	37	int offset)
	38	{
	39	offset <<= up->regshift;
	40	return (unsigned int)__raw_readb(up->membase + offset);
	41	}
	42
	43	static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset,
	44	int value)
	45	{
	46	offset <<= p->regshift;
	47	__raw_writeb(value, p->membase + offset);
	48	}
	49
	50	/*
	51	* Internal UARTs need to be initialized for the 8250 autoconfig to work
	52	* properly. Note that the TX watermark initialization may not be needed
	53	* once the 8250.c watermark handling code is merged.
	54	*/
	55	static void __init omap_serial_reset(struct plat_serial8250_port *p)
	56	{
498cb951 AE	57	omap_serial_outp(p, UART_OMAP_MDR1,
498cb951 AE	58	UART_OMAP_MDR1_DISABLE); /* disable UART */
f577ffd7	59	omap_serial_outp(p, UART_OMAP_SCR, 0x08); /* TX watermark */
498cb951 AE	60	omap_serial_outp(p, UART_OMAP_MDR1,
498cb951 AE	61	UART_OMAP_MDR1_16X_MODE); /* enable UART */
f577ffd7	62
65d873ca	63	if (!cpu_is_omap15xx()) {
f577ffd7 TL	64	omap_serial_outp(p, UART_OMAP_SYSC, 0x01);
	65	while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01));
	66	}
	67	}
	68
	69	static struct plat_serial8250_port serial_platform_data[] = {
	70	{
4f2c49fe	71	.mapbase = OMAP1_UART1_BASE,
f577ffd7 TL	72	.irq = INT_UART1,
	73	.flags = UPF_BOOT_AUTOCONF,
	74	.iotype = UPIO_MEM,
	75	.regshift = 2,
	76	.uartclk = OMAP16XX_BASE_BAUD * 16,
	77	},
	78	{
4f2c49fe	79	.mapbase = OMAP1_UART2_BASE,
f577ffd7 TL	80	.irq = INT_UART2,
	81	.flags = UPF_BOOT_AUTOCONF,
	82	.iotype = UPIO_MEM,
	83	.regshift = 2,
	84	.uartclk = OMAP16XX_BASE_BAUD * 16,
	85	},
	86	{
4f2c49fe	87	.mapbase = OMAP1_UART3_BASE,
f577ffd7 TL	88	.irq = INT_UART3,
	89	.flags = UPF_BOOT_AUTOCONF,
	90	.iotype = UPIO_MEM,
	91	.regshift = 2,
	92	.uartclk = OMAP16XX_BASE_BAUD * 16,
	93	},
	94	{ },
	95	};
	96
	97	static struct platform_device serial_device = {
	98	.name = "serial8250",
6df29deb	99	.id = PLAT8250_DEV_PLATFORM,
f577ffd7 TL	100	.dev = {
	101	.platform_data = serial_platform_data,
	102	},
	103	};
	104
	105	/*
	106	* Note that on Innovator-1510 UART2 pins conflict with USB2.
	107	* By default UART2 does not work on Innovator-1510 if you have
	108	* USB OHCI enabled. To use UART2, you must disable USB2 first.
	109	*/
3179a019	110	void __init omap_serial_init(void)
f577ffd7 TL	111	{
	112	int i;
	113
d8723ae2	114	if (cpu_is_omap7xx()) {
f577ffd7 TL	115	serial_platform_data[0].regshift = 0;
f577ffd7 TL	116	serial_platform_data[1].regshift = 0;
372b1c32 AB	117	serial_platform_data[0].irq = INT_7XX_UART_MODEM_1;
372b1c32 AB	118	serial_platform_data[1].irq = INT_7XX_UART_MODEM_IRDA_2;
56739a69 ZM	119	}
56739a69 ZM	120
65d873ca	121	if (cpu_is_omap15xx()) {
f577ffd7 TL	122	serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16;
	123	serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16;
	124	serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16;
	125	}
	126
9d30b99f	127	for (i = 0; i < ARRAY_SIZE(serial_platform_data) - 1; i++) {
f577ffd7	128
8b8fbd39 CM	129	/* Don't look at UARTs higher than 2 for omap7xx */
	130	if (cpu_is_omap7xx() && i > 1) {
	131	serial_platform_data[i].membase = NULL;
	132	serial_platform_data[i].mapbase = 0;
	133	continue;
	134	}
	135
84f90c9c TL	136	/* Static mapping, never released */
	137	serial_platform_data[i].membase =
	138	ioremap(serial_platform_data[i].mapbase, SZ_2K);
	139	if (!serial_platform_data[i].membase) {
	140	printk(KERN_ERR "Could not ioremap uart%i\n", i);
	141	continue;
	142	}
f577ffd7 TL	143	switch (i) {
	144	case 0:
	145	uart1_ck = clk_get(NULL, "uart1_ck");
	146	if (IS_ERR(uart1_ck))
	147	printk("Could not get uart1_ck\n");
	148	else {
30ff720b	149	clk_enable(uart1_ck);
65d873ca	150	if (cpu_is_omap15xx())
f577ffd7 TL	151	clk_set_rate(uart1_ck, 12000000);
f577ffd7 TL	152	}
f577ffd7 TL	153	break;
	154	case 1:
	155	uart2_ck = clk_get(NULL, "uart2_ck");
	156	if (IS_ERR(uart2_ck))
	157	printk("Could not get uart2_ck\n");
	158	else {
30ff720b	159	clk_enable(uart2_ck);
65d873ca	160	if (cpu_is_omap15xx())
f577ffd7 TL	161	clk_set_rate(uart2_ck, 12000000);
	162	else
	163	clk_set_rate(uart2_ck, 48000000);
	164	}
f577ffd7 TL	165	break;
	166	case 2:
	167	uart3_ck = clk_get(NULL, "uart3_ck");
	168	if (IS_ERR(uart3_ck))
	169	printk("Could not get uart3_ck\n");
	170	else {
30ff720b	171	clk_enable(uart3_ck);
65d873ca	172	if (cpu_is_omap15xx())
f577ffd7 TL	173	clk_set_rate(uart3_ck, 12000000);
f577ffd7 TL	174	}
f577ffd7 TL	175	break;
	176	}
	177	omap_serial_reset(&serial_platform_data[i]);
	178	}
	179	}
	180
7c38cf02 TL	181	#ifdef CONFIG_OMAP_SERIAL_WAKE
7c38cf02 TL	182
0cd61b68	183	static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id)
7c38cf02 TL	184	{
	185	/* Need to do something with serial port right after wake-up? */
	186	return IRQ_HANDLED;
	187	}
	188
	189	/*
	190	* Reroutes serial RX lines to GPIO lines for the duration of
	191	* sleep to allow waking up the device from serial port even
	192	* in deep sleep.
	193	*/
	194	void omap_serial_wake_trigger(int enable)
	195	{
	196	if (!cpu_is_omap16xx())
	197	return;
	198
	199	if (uart1_ck != NULL) {
	200	if (enable)
	201	omap_cfg_reg(V14_16XX_GPIO37);
	202	else
	203	omap_cfg_reg(V14_16XX_UART1_RX);
	204	}
	205	if (uart2_ck != NULL) {
	206	if (enable)
	207	omap_cfg_reg(R9_16XX_GPIO18);
	208	else
	209	omap_cfg_reg(R9_16XX_UART2_RX);
	210	}
	211	if (uart3_ck != NULL) {
	212	if (enable)
	213	omap_cfg_reg(L14_16XX_GPIO49);
	214	else
	215	omap_cfg_reg(L14_16XX_UART3_RX);
	216	}
	217	}
	218
	219	static void __init omap_serial_set_port_wakeup(int gpio_nr)
	220	{
	221	int ret;
	222
f2d18fea	223	ret = gpio_request(gpio_nr, "UART wake");
7c38cf02 TL	224	if (ret < 0) {
	225	printk(KERN_ERR "Could not request UART wake GPIO: %i\n",
	226	gpio_nr);
	227	return;
	228	}
40e3925b	229	gpio_direction_input(gpio_nr);
15f74b03	230	ret = request_irq(gpio_to_irq(gpio_nr), &omap_serial_wake_interrupt,
52e405ea	231	IRQF_TRIGGER_RISING, "serial wakeup", NULL);
7c38cf02	232	if (ret) {
f2d18fea	233	gpio_free(gpio_nr);
7c38cf02 TL	234	printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n",
	235	gpio_nr);
	236	return;
	237	}
15f74b03	238	enable_irq_wake(gpio_to_irq(gpio_nr));
7c38cf02 TL	239	}
	240
	241	static int __init omap_serial_wakeup_init(void)
	242	{
	243	if (!cpu_is_omap16xx())
	244	return 0;
	245
	246	if (uart1_ck != NULL)
	247	omap_serial_set_port_wakeup(37);
	248	if (uart2_ck != NULL)
	249	omap_serial_set_port_wakeup(18);
	250	if (uart3_ck != NULL)
	251	omap_serial_set_port_wakeup(49);
	252
	253	return 0;
	254	}
	255	late_initcall(omap_serial_wakeup_init);
	256
	257	#endif /* CONFIG_OMAP_SERIAL_WAKE */
	258
f577ffd7 TL	259	static int __init omap_init(void)
f577ffd7 TL	260	{
7f9187c2 TL	261	if (!cpu_class_is_omap1())
	262	return -ENODEV;
	263
f577ffd7 TL	264	return platform_device_register(&serial_device);
	265	}
	266	arch_initcall(omap_init);