arch/arm/mach-omap1/serial.c - kernel/msm-4.19 - Gitiles

 /*
  * 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 <mach/board.h>
 #include <mach/mux.h>
 #include <mach/gpio.h>
 #include <mach/fpga.h>
 #ifdef CONFIG_PM
 #include <mach/pm.h>
 #endif

 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, 0x07);	/* disable UART */
 	omap_serial_outp(p, UART_OMAP_SCR, 0x08);	/* TX watermark */
 	omap_serial_outp(p, UART_OMAP_MDR1, 0x00);	/* 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[] = {
 	{
 		.membase	= (char*)IO_ADDRESS(OMAP_UART1_BASE),
 		.mapbase	= (unsigned long)OMAP_UART1_BASE,
 		.irq		= INT_UART1,
 		.flags		= UPF_BOOT_AUTOCONF,
 		.iotype		= UPIO_MEM,
 		.regshift	= 2,
 		.uartclk	= OMAP16XX_BASE_BAUD * 16,
 	},
 	{
 		.membase	= (char*)IO_ADDRESS(OMAP_UART2_BASE),
 		.mapbase	= (unsigned long)OMAP_UART2_BASE,
 		.irq		= INT_UART2,
 		.flags		= UPF_BOOT_AUTOCONF,
 		.iotype		= UPIO_MEM,
 		.regshift	= 2,
 		.uartclk	= OMAP16XX_BASE_BAUD * 16,
 	},
 	{
 		.membase	= (char*)IO_ADDRESS(OMAP_UART3_BASE),
 		.mapbase	= (unsigned long)OMAP_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;
 	const struct omap_uart_config *info;

 	if (cpu_is_omap730()) {
 		serial_platform_data[0].regshift = 0;
 		serial_platform_data[1].regshift = 0;
 		serial_platform_data[0].irq = INT_730_UART_MODEM_1;
 		serial_platform_data[1].irq = INT_730_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;
 	}

 	info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
 	if (info == NULL)
 		return;

 	for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
 		unsigned char reg;

 		if (!((1 << i) & info->enabled_uarts)) {
 			serial_platform_data[i].membase = NULL;
 			serial_platform_data[i].mapbase = 0;
 			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);
 			}
 			if (cpu_is_omap15xx()) {
 				omap_cfg_reg(UART1_TX);
 				omap_cfg_reg(UART1_RTS);
 				if (machine_is_omap_innovator()) {
 					reg = fpga_read(OMAP1510_FPGA_POWER);
 					reg |= OMAP1510_FPGA_PCR_COM1_EN;
 					fpga_write(reg, OMAP1510_FPGA_POWER);
 					udelay(10);
 				}
 			}
 			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);
 			}
 			if (cpu_is_omap15xx()) {
 				omap_cfg_reg(UART2_TX);
 				omap_cfg_reg(UART2_RTS);
 				if (machine_is_omap_innovator()) {
 					reg = fpga_read(OMAP1510_FPGA_POWER);
 					reg |= OMAP1510_FPGA_PCR_COM2_EN;
 					fpga_write(reg, OMAP1510_FPGA_POWER);
 					udelay(10);
 				}
 			}
 			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);
 			}
 			if (cpu_is_omap15xx()) {
 				omap_cfg_reg(UART3_TX);
 				omap_cfg_reg(UART3_RX);
 			}
 			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 = omap_request_gpio(gpio_nr);
 	if (ret < 0) {
 		printk(KERN_ERR "Could not request UART wake GPIO: %i\n",
 		       gpio_nr);
 		return;
 	}
 	omap_set_gpio_direction(gpio_nr, 1);
 	ret = request_irq(OMAP_GPIO_IRQ(gpio_nr), &omap_serial_wake_interrupt,
 			  IRQF_TRIGGER_RISING, "serial wakeup", NULL);
 	if (ret) {
 		omap_free_gpio(gpio_nr);
 		printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n",
 		       gpio_nr);
 		return;
 	}
 	enable_irq_wake(OMAP_GPIO_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)
 {
 	return platform_device_register(&serial_device);
 }
 arch_initcall(omap_init);
	/*
	* 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 <mach/board.h>
	#include <mach/mux.h>
	#include <mach/gpio.h>
	#include <mach/fpga.h>
	#ifdef CONFIG_PM
	#include <mach/pm.h>
	#endif

	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, 0x07); /* disable UART */
	omap_serial_outp(p, UART_OMAP_SCR, 0x08); /* TX watermark */
	omap_serial_outp(p, UART_OMAP_MDR1, 0x00); /* 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[] = {
	{
	.membase = (char*)IO_ADDRESS(OMAP_UART1_BASE),
	.mapbase = (unsigned long)OMAP_UART1_BASE,
	.irq = INT_UART1,
	.flags = UPF_BOOT_AUTOCONF,
	.iotype = UPIO_MEM,
	.regshift = 2,
	.uartclk = OMAP16XX_BASE_BAUD * 16,
	},
	{
	.membase = (char*)IO_ADDRESS(OMAP_UART2_BASE),
	.mapbase = (unsigned long)OMAP_UART2_BASE,
	.irq = INT_UART2,
	.flags = UPF_BOOT_AUTOCONF,
	.iotype = UPIO_MEM,
	.regshift = 2,
	.uartclk = OMAP16XX_BASE_BAUD * 16,
	},
	{
	.membase = (char*)IO_ADDRESS(OMAP_UART3_BASE),
	.mapbase = (unsigned long)OMAP_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;
	const struct omap_uart_config *info;

	if (cpu_is_omap730()) {
	serial_platform_data[0].regshift = 0;
	serial_platform_data[1].regshift = 0;
	serial_platform_data[0].irq = INT_730_UART_MODEM_1;
	serial_platform_data[1].irq = INT_730_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;
	}

	info = omap_get_config(OMAP_TAG_UART, struct omap_uart_config);
	if (info == NULL)
	return;

	for (i = 0; i < OMAP_MAX_NR_PORTS; i++) {
	unsigned char reg;

	if (!((1 << i) & info->enabled_uarts)) {
	serial_platform_data[i].membase = NULL;
	serial_platform_data[i].mapbase = 0;
	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);
	}
	if (cpu_is_omap15xx()) {
	omap_cfg_reg(UART1_TX);
	omap_cfg_reg(UART1_RTS);
	if (machine_is_omap_innovator()) {
	reg = fpga_read(OMAP1510_FPGA_POWER);
	reg \|= OMAP1510_FPGA_PCR_COM1_EN;
	fpga_write(reg, OMAP1510_FPGA_POWER);
	udelay(10);
	}
	}
	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);
	}
	if (cpu_is_omap15xx()) {
	omap_cfg_reg(UART2_TX);
	omap_cfg_reg(UART2_RTS);
	if (machine_is_omap_innovator()) {
	reg = fpga_read(OMAP1510_FPGA_POWER);
	reg \|= OMAP1510_FPGA_PCR_COM2_EN;
	fpga_write(reg, OMAP1510_FPGA_POWER);
	udelay(10);
	}
	}
	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);
	}
	if (cpu_is_omap15xx()) {
	omap_cfg_reg(UART3_TX);
	omap_cfg_reg(UART3_RX);
	}
	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 = omap_request_gpio(gpio_nr);
	if (ret < 0) {
	printk(KERN_ERR "Could not request UART wake GPIO: %i\n",
	gpio_nr);
	return;
	}
	omap_set_gpio_direction(gpio_nr, 1);
	ret = request_irq(OMAP_GPIO_IRQ(gpio_nr), &omap_serial_wake_interrupt,
	IRQF_TRIGGER_RISING, "serial wakeup", NULL);
	if (ret) {
	omap_free_gpio(gpio_nr);
	printk(KERN_ERR "No interrupt for UART wake GPIO: %i\n",
	gpio_nr);
	return;
	}
	enable_irq_wake(OMAP_GPIO_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)
	{
	return platform_device_register(&serial_device);
	}
	arch_initcall(omap_init);