[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/gpio.h>
#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 <mach/mux.h>

#include "pm.h"
#include "soc.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));
}

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;
}

#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	*/
2f8163ba	10	#include <linux/gpio.h>
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
70c494c3	25	#include <mach/mux.h>
f577ffd7	26
706afdda	27	#include "pm.h"
e99b32e2	28	#include "soc.h"
706afdda	29
120db2cb TL	30	static struct clk * uart1_ck;
	31	static struct clk * uart2_ck;
	32	static struct clk * uart3_ck;
f577ffd7 TL	33
	34	static inline unsigned int omap_serial_in(struct plat_serial8250_port *up,
	35	int offset)
	36	{
	37	offset <<= up->regshift;
	38	return (unsigned int)__raw_readb(up->membase + offset);
	39	}
	40
	41	static inline void omap_serial_outp(struct plat_serial8250_port *p, int offset,
	42	int value)
	43	{
	44	offset <<= p->regshift;
	45	__raw_writeb(value, p->membase + offset);
	46	}
	47
	48	/*
	49	* Internal UARTs need to be initialized for the 8250 autoconfig to work
	50	* properly. Note that the TX watermark initialization may not be needed
	51	* once the 8250.c watermark handling code is merged.
	52	*/
	53	static void __init omap_serial_reset(struct plat_serial8250_port *p)
	54	{
498cb951 AE	55	omap_serial_outp(p, UART_OMAP_MDR1,
498cb951 AE	56	UART_OMAP_MDR1_DISABLE); /* disable UART */
f577ffd7	57	omap_serial_outp(p, UART_OMAP_SCR, 0x08); /* TX watermark */
498cb951 AE	58	omap_serial_outp(p, UART_OMAP_MDR1,
498cb951 AE	59	UART_OMAP_MDR1_16X_MODE); /* enable UART */
f577ffd7	60
65d873ca	61	if (!cpu_is_omap15xx()) {
f577ffd7 TL	62	omap_serial_outp(p, UART_OMAP_SYSC, 0x01);
	63	while (!(omap_serial_in(p, UART_OMAP_SYSC) & 0x01));
	64	}
	65	}
	66
	67	static struct plat_serial8250_port serial_platform_data[] = {
	68	{
4f2c49fe	69	.mapbase = OMAP1_UART1_BASE,
f577ffd7 TL	70	.irq = INT_UART1,
	71	.flags = UPF_BOOT_AUTOCONF,
	72	.iotype = UPIO_MEM,
	73	.regshift = 2,
	74	.uartclk = OMAP16XX_BASE_BAUD * 16,
	75	},
	76	{
4f2c49fe	77	.mapbase = OMAP1_UART2_BASE,
f577ffd7 TL	78	.irq = INT_UART2,
	79	.flags = UPF_BOOT_AUTOCONF,
	80	.iotype = UPIO_MEM,
	81	.regshift = 2,
	82	.uartclk = OMAP16XX_BASE_BAUD * 16,
	83	},
	84	{
4f2c49fe	85	.mapbase = OMAP1_UART3_BASE,
f577ffd7 TL	86	.irq = INT_UART3,
	87	.flags = UPF_BOOT_AUTOCONF,
	88	.iotype = UPIO_MEM,
	89	.regshift = 2,
	90	.uartclk = OMAP16XX_BASE_BAUD * 16,
	91	},
	92	{ },
	93	};
	94
	95	static struct platform_device serial_device = {
	96	.name = "serial8250",
6df29deb	97	.id = PLAT8250_DEV_PLATFORM,
f577ffd7 TL	98	.dev = {
	99	.platform_data = serial_platform_data,
	100	},
	101	};
	102
	103	/*
	104	* Note that on Innovator-1510 UART2 pins conflict with USB2.
	105	* By default UART2 does not work on Innovator-1510 if you have
	106	* USB OHCI enabled. To use UART2, you must disable USB2 first.
	107	*/
3179a019	108	void __init omap_serial_init(void)
f577ffd7 TL	109	{
	110	int i;
	111
d8723ae2	112	if (cpu_is_omap7xx()) {
f577ffd7 TL	113	serial_platform_data[0].regshift = 0;
f577ffd7 TL	114	serial_platform_data[1].regshift = 0;
372b1c32 AB	115	serial_platform_data[0].irq = INT_7XX_UART_MODEM_1;
372b1c32 AB	116	serial_platform_data[1].irq = INT_7XX_UART_MODEM_IRDA_2;
56739a69 ZM	117	}
56739a69 ZM	118
65d873ca	119	if (cpu_is_omap15xx()) {
f577ffd7 TL	120	serial_platform_data[0].uartclk = OMAP1510_BASE_BAUD * 16;
	121	serial_platform_data[1].uartclk = OMAP1510_BASE_BAUD * 16;
	122	serial_platform_data[2].uartclk = OMAP1510_BASE_BAUD * 16;
	123	}
	124
9d30b99f	125	for (i = 0; i < ARRAY_SIZE(serial_platform_data) - 1; i++) {
f577ffd7	126
8b8fbd39 CM	127	/* Don't look at UARTs higher than 2 for omap7xx */
	128	if (cpu_is_omap7xx() && i > 1) {
	129	serial_platform_data[i].membase = NULL;
	130	serial_platform_data[i].mapbase = 0;
	131	continue;
	132	}
	133
84f90c9c TL	134	/* Static mapping, never released */
	135	serial_platform_data[i].membase =
	136	ioremap(serial_platform_data[i].mapbase, SZ_2K);
	137	if (!serial_platform_data[i].membase) {
	138	printk(KERN_ERR "Could not ioremap uart%i\n", i);
	139	continue;
	140	}
f577ffd7 TL	141	switch (i) {
	142	case 0:
	143	uart1_ck = clk_get(NULL, "uart1_ck");
	144	if (IS_ERR(uart1_ck))
	145	printk("Could not get uart1_ck\n");
	146	else {
30ff720b	147	clk_enable(uart1_ck);
65d873ca	148	if (cpu_is_omap15xx())
f577ffd7 TL	149	clk_set_rate(uart1_ck, 12000000);
f577ffd7 TL	150	}
f577ffd7 TL	151	break;
	152	case 1:
	153	uart2_ck = clk_get(NULL, "uart2_ck");
	154	if (IS_ERR(uart2_ck))
	155	printk("Could not get uart2_ck\n");
	156	else {
30ff720b	157	clk_enable(uart2_ck);
65d873ca	158	if (cpu_is_omap15xx())
f577ffd7 TL	159	clk_set_rate(uart2_ck, 12000000);
	160	else
	161	clk_set_rate(uart2_ck, 48000000);
	162	}
f577ffd7 TL	163	break;
	164	case 2:
	165	uart3_ck = clk_get(NULL, "uart3_ck");
	166	if (IS_ERR(uart3_ck))
	167	printk("Could not get uart3_ck\n");
	168	else {
30ff720b	169	clk_enable(uart3_ck);
65d873ca	170	if (cpu_is_omap15xx())
f577ffd7 TL	171	clk_set_rate(uart3_ck, 12000000);
f577ffd7 TL	172	}
f577ffd7 TL	173	break;
	174	}
	175	omap_serial_reset(&serial_platform_data[i]);
	176	}
	177	}
	178
7c38cf02 TL	179	#ifdef CONFIG_OMAP_SERIAL_WAKE
7c38cf02 TL	180
0cd61b68	181	static irqreturn_t omap_serial_wake_interrupt(int irq, void *dev_id)
7c38cf02 TL	182	{
	183	/* Need to do something with serial port right after wake-up? */
	184	return IRQ_HANDLED;
	185	}
	186
	187	/*
	188	* Reroutes serial RX lines to GPIO lines for the duration of
	189	* sleep to allow waking up the device from serial port even
	190	* in deep sleep.
	191	*/
	192	void omap_serial_wake_trigger(int enable)
	193	{
	194	if (!cpu_is_omap16xx())
	195	return;
	196
	197	if (uart1_ck != NULL) {
	198	if (enable)
	199	omap_cfg_reg(V14_16XX_GPIO37);
	200	else
	201	omap_cfg_reg(V14_16XX_UART1_RX);
	202	}
	203	if (uart2_ck != NULL) {
	204	if (enable)
	205	omap_cfg_reg(R9_16XX_GPIO18);
	206	else
	207	omap_cfg_reg(R9_16XX_UART2_RX);
	208	}
	209	if (uart3_ck != NULL) {
	210	if (enable)
	211	omap_cfg_reg(L14_16XX_GPIO49);
	212	else
	213	omap_cfg_reg(L14_16XX_UART3_RX);
	214	}
	215	}
	216
	217	static void __init omap_serial_set_port_wakeup(int gpio_nr)
	218	{
	219	int ret;
	220
f2d18fea	221	ret = gpio_request(gpio_nr, "UART wake");
7c38cf02 TL	222	if (ret < 0) {
	223	printk(KERN_ERR "Could not request UART wake GPIO: %i\n",
	224	gpio_nr);
	225	return;
	226	}
40e3925b	227	gpio_direction_input(gpio_nr);
15f74b03	228	ret = request_irq(gpio_to_irq(gpio_nr), &omap_serial_wake_interrupt,
52e405ea	229	IRQF_TRIGGER_RISING, "serial wakeup", NULL);
7c38cf02	230	if (ret) {
f2d18fea	231	gpio_free(gpio_nr);
7c38cf02 TL	232	printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n",
	233	gpio_nr);
	234	return;
	235	}
15f74b03	236	enable_irq_wake(gpio_to_irq(gpio_nr));
7c38cf02 TL	237	}
7c38cf02 TL	238
82c3bd03	239	int __init omap_serial_wakeup_init(void)
7c38cf02 TL	240	{
	241	if (!cpu_is_omap16xx())
	242	return 0;
	243
	244	if (uart1_ck != NULL)
	245	omap_serial_set_port_wakeup(37);
	246	if (uart2_ck != NULL)
	247	omap_serial_set_port_wakeup(18);
	248	if (uart3_ck != NULL)
	249	omap_serial_set_port_wakeup(49);
	250
	251	return 0;
	252	}
7c38cf02 TL	253
	254	#endif /* CONFIG_OMAP_SERIAL_WAKE */
	255
f577ffd7 TL	256	static int __init omap_init(void)
f577ffd7 TL	257	{
7f9187c2 TL	258	if (!cpu_class_is_omap1())
	259	return -ENODEV;
	260
f577ffd7 TL	261	return platform_device_register(&serial_device);
	262	}
	263	arch_initcall(omap_init);