drivers/tty/serial/8250/8250_hp300.c - linux - Git at Google

 /*
  * Driver for the 98626/98644/internal serial interface on hp300/hp400
  * (based on the National Semiconductor INS8250/NS16550AF/WD16C552 UARTs)
  *
  * Ported from 2.2 and modified to use the normal 8250 driver
  * by Kars de Jong <jongk@linux-m68k.org>, May 2004.
  */
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/string.h>
 #include <linux/kernel.h>
 #include <linux/serial.h>
 #include <linux/serial_core.h>
 #include <linux/serial_8250.h>
 #include <linux/delay.h>
 #include <linux/dio.h>
 #include <linux/console.h>
 #include <linux/slab.h>
 #include <asm/io.h>

 #include "8250.h"

 #if !defined(CONFIG_HPDCA) && !defined(CONFIG_HPAPCI)
 #warning CONFIG_SERIAL_8250 defined but neither CONFIG_HPDCA nor CONFIG_HPAPCI defined, are you sure?
 #endif

 #ifdef CONFIG_HPAPCI
 struct hp300_port
 {
 	struct hp300_port *next;	/* next port */
 	int line;			/* line (tty) number */
 };

 static struct hp300_port *hp300_ports;
 #endif

 #ifdef CONFIG_HPDCA

 static int hpdca_init_one(struct dio_dev *d,
 					const struct dio_device_id *ent);
 static void hpdca_remove_one(struct dio_dev *d);

 static struct dio_device_id hpdca_dio_tbl[] = {
 	{ DIO_ID_DCA0 },
 	{ DIO_ID_DCA0REM },
 	{ DIO_ID_DCA1 },
 	{ DIO_ID_DCA1REM },
 	{ 0 }
 };

 static struct dio_driver hpdca_driver = {
 	.name      = "hpdca",
 	.id_table  = hpdca_dio_tbl,
 	.probe     = hpdca_init_one,
 	.remove    = hpdca_remove_one,
 };

 #endif

 static unsigned int num_ports;

 extern int hp300_uart_scode;

 /* Offset to UART registers from base of DCA */
 #define UART_OFFSET	17

 #define DCA_ID		0x01	/* ID (read), reset (write) */
 #define DCA_IC		0x03	/* Interrupt control        */

 /* Interrupt control */
 #define DCA_IC_IE	0x80	/* Master interrupt enable  */

 #define HPDCA_BAUD_BASE 153600

 /* Base address of the Frodo part */
 #define FRODO_BASE	(0x41c000)

 /*
  * Where we find the 8250-like APCI ports, and how far apart they are.
  */
 #define FRODO_APCIBASE		0x0
 #define FRODO_APCISPACE		0x20
 #define FRODO_APCI_OFFSET(x)	(FRODO_APCIBASE + ((x) * FRODO_APCISPACE))

 #define HPAPCI_BAUD_BASE 500400

 #ifdef CONFIG_SERIAL_8250_CONSOLE
 /*
  * Parse the bootinfo to find descriptions for headless console and
  * debug serial ports and register them with the 8250 driver.
  */
 int __init hp300_setup_serial_console(void)
 {
 	int scode;
 	struct uart_port port;

 	memset(&port, 0, sizeof(port));

 	if (hp300_uart_scode < 0 || hp300_uart_scode > DIO_SCMAX)
 		return 0;

 	if (DIO_SCINHOLE(hp300_uart_scode))
 		return 0;

 	scode = hp300_uart_scode;

 	/* Memory mapped I/O */
 	port.iotype = UPIO_MEM;
 	port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
 	port.type = PORT_UNKNOWN;

 	/* Check for APCI console */
 	if (scode == 256) {
 #ifdef CONFIG_HPAPCI
 		printk(KERN_INFO "Serial console is HP APCI 1\n");

 		port.uartclk = HPAPCI_BAUD_BASE * 16;
 		port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1));
 		port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
 		port.regshift = 2;
 		add_preferred_console("ttyS", port.line, "9600n8");
 #else
 		printk(KERN_WARNING "Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n");
 		return 0;
 #endif
 	} else {
 #ifdef CONFIG_HPDCA
 		unsigned long pa = dio_scodetophysaddr(scode);
 		if (!pa)
 			return 0;

 		printk(KERN_INFO "Serial console is HP DCA at select code %d\n", scode);

 		port.uartclk = HPDCA_BAUD_BASE * 16;
 		port.mapbase = (pa + UART_OFFSET);
 		port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
 		port.regshift = 1;
 		port.irq = DIO_IPL(pa + DIO_VIRADDRBASE);

 		/* Enable board-interrupts */
 		out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);

 		if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80)
 			add_preferred_console("ttyS", port.line, "9600n8");
 #else
 		printk(KERN_WARNING "Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
 		return 0;
 #endif
 	}

 	if (early_serial_setup(&port) < 0)
 		printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n");
 	return 0;
 }
 #endif /* CONFIG_SERIAL_8250_CONSOLE */

 #ifdef CONFIG_HPDCA
 static int hpdca_init_one(struct dio_dev *d,
 				const struct dio_device_id *ent)
 {
 	struct uart_8250_port uart;
 	int line;

 #ifdef CONFIG_SERIAL_8250_CONSOLE
 	if (hp300_uart_scode == d->scode) {
 		/* Already got it. */
 		return 0;
 	}
 #endif
 	memset(&uart, 0, sizeof(uart));

 	/* Memory mapped I/O */
 	uart.port.iotype = UPIO_MEM;
 	uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
 	uart.port.irq = d->ipl;
 	uart.port.uartclk = HPDCA_BAUD_BASE * 16;
 	uart.port.mapbase = (d->resource.start + UART_OFFSET);
 	uart.port.membase = (char *)(uart.port.mapbase + DIO_VIRADDRBASE);
 	uart.port.regshift = 1;
 	uart.port.dev = &d->dev;
 	line = serial8250_register_8250_port(&uart);

 	if (line < 0) {
 		printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
 		       " irq %d failed\n", d->scode, uart.port.irq);
 		return -ENOMEM;
 	}

 	/* Enable board-interrupts */
 	out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
 	dio_set_drvdata(d, (void *)line);

 	/* Reset the DCA */
 	out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
 	udelay(100);

 	num_ports++;

 	return 0;
 }
 #endif

 static int __init hp300_8250_init(void)
 {
 	static int called;
 #ifdef CONFIG_HPAPCI
 	int line;
 	unsigned long base;
 	struct uart_8250_port uart;
 	struct hp300_port *port;
 	int i;
 #endif
 	if (called)
 		return -ENODEV;
 	called = 1;

 	if (!MACH_IS_HP300)
 		return -ENODEV;

 #ifdef CONFIG_HPDCA
 	dio_register_driver(&hpdca_driver);
 #endif
 #ifdef CONFIG_HPAPCI
 	if (hp300_model < HP_400) {
 		if (!num_ports)
 			return -ENODEV;
 		return 0;
 	}
 	/* These models have the Frodo chip.
 	 * Port 0 is reserved for the Apollo Domain keyboard.
 	 * Port 1 is either the console or the DCA.
 	 */
 	for (i = 1; i < 4; i++) {
 		/* Port 1 is the console on a 425e, on other machines it's
 		 * mapped to DCA.
 		 */
 #ifdef CONFIG_SERIAL_8250_CONSOLE
 		if (i == 1)
 			continue;
 #endif

 		/* Create new serial device */
 		port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL);
 		if (!port)
 			return -ENOMEM;

 		memset(&uart, 0, sizeof(uart));

 		base = (FRODO_BASE + FRODO_APCI_OFFSET(i));

 		/* Memory mapped I/O */
 		uart.port.iotype = UPIO_MEM;
 		uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ \
 			      | UPF_BOOT_AUTOCONF;
 		/* XXX - no interrupt support yet */
 		uart.port.irq = 0;
 		uart.port.uartclk = HPAPCI_BAUD_BASE * 16;
 		uart.port.mapbase = base;
 		uart.port.membase = (char *)(base + DIO_VIRADDRBASE);
 		uart.port.regshift = 2;

 		line = serial8250_register_8250_port(&uart);

 		if (line < 0) {
 			printk(KERN_NOTICE "8250_hp300: register_serial() APCI"
 			       " %d irq %d failed\n", i, uart.port.irq);
 			kfree(port);
 			continue;
 		}

 		port->line = line;
 		port->next = hp300_ports;
 		hp300_ports = port;

 		num_ports++;
 	}
 #endif

 	/* Any boards found? */
 	if (!num_ports)
 		return -ENODEV;

 	return 0;
 }

 #ifdef CONFIG_HPDCA
 static void hpdca_remove_one(struct dio_dev *d)
 {
 	int line;

 	line = (int) dio_get_drvdata(d);
 	if (d->resource.start) {
 		/* Disable board-interrupts */
 		out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
 	}
 	serial8250_unregister_port(line);
 }
 #endif

 static void __exit hp300_8250_exit(void)
 {
 #ifdef CONFIG_HPAPCI
 	struct hp300_port *port, *to_free;

 	for (port = hp300_ports; port; ) {
 		serial8250_unregister_port(port->line);
 		to_free = port;
 		port = port->next;
 		kfree(to_free);
 	}

 	hp300_ports = NULL;
 #endif
 #ifdef CONFIG_HPDCA
 	dio_unregister_driver(&hpdca_driver);
 #endif
 }

 module_init(hp300_8250_init);
 module_exit(hp300_8250_exit);
 MODULE_DESCRIPTION("HP DCA/APCI serial driver");
 MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
 MODULE_LICENSE("GPL");
	/*
	* Driver for the 98626/98644/internal serial interface on hp300/hp400
	* (based on the National Semiconductor INS8250/NS16550AF/WD16C552 UARTs)
	*
	* Ported from 2.2 and modified to use the normal 8250 driver
	* by Kars de Jong <jongk@linux-m68k.org>, May 2004.
	*/
	#include <linux/module.h>
	#include <linux/init.h>
	#include <linux/string.h>
	#include <linux/kernel.h>
	#include <linux/serial.h>
	#include <linux/serial_core.h>
	#include <linux/serial_8250.h>
	#include <linux/delay.h>
	#include <linux/dio.h>
	#include <linux/console.h>
	#include <linux/slab.h>
	#include <asm/io.h>

	#include "8250.h"

	#if !defined(CONFIG_HPDCA) && !defined(CONFIG_HPAPCI)
	#warning CONFIG_SERIAL_8250 defined but neither CONFIG_HPDCA nor CONFIG_HPAPCI defined, are you sure?
	#endif

	#ifdef CONFIG_HPAPCI
	struct hp300_port
	{
	struct hp300_port next; / next port */
	int line; /* line (tty) number */
	};

	static struct hp300_port *hp300_ports;
	#endif

	#ifdef CONFIG_HPDCA

	static int hpdca_init_one(struct dio_dev *d,
	const struct dio_device_id *ent);
	static void hpdca_remove_one(struct dio_dev *d);

	static struct dio_device_id hpdca_dio_tbl[] = {
	{ DIO_ID_DCA0 },
	{ DIO_ID_DCA0REM },
	{ DIO_ID_DCA1 },
	{ DIO_ID_DCA1REM },
	{ 0 }
	};

	static struct dio_driver hpdca_driver = {
	.name = "hpdca",
	.id_table = hpdca_dio_tbl,
	.probe = hpdca_init_one,
	.remove = hpdca_remove_one,
	};

	#endif

	static unsigned int num_ports;

	extern int hp300_uart_scode;

	/* Offset to UART registers from base of DCA */
	#define UART_OFFSET 17

	#define DCA_ID 0x01 /* ID (read), reset (write) */
	#define DCA_IC 0x03 /* Interrupt control */

	/* Interrupt control */
	#define DCA_IC_IE 0x80 /* Master interrupt enable */

	#define HPDCA_BAUD_BASE 153600

	/* Base address of the Frodo part */
	#define FRODO_BASE (0x41c000)

	/*
	* Where we find the 8250-like APCI ports, and how far apart they are.
	*/
	#define FRODO_APCIBASE 0x0
	#define FRODO_APCISPACE 0x20
	#define FRODO_APCI_OFFSET(x) (FRODO_APCIBASE + ((x) * FRODO_APCISPACE))

	#define HPAPCI_BAUD_BASE 500400

	#ifdef CONFIG_SERIAL_8250_CONSOLE
	/*
	* Parse the bootinfo to find descriptions for headless console and
	* debug serial ports and register them with the 8250 driver.
	*/
	int __init hp300_setup_serial_console(void)
	{
	int scode;
	struct uart_port port;

	memset(&port, 0, sizeof(port));

	if (hp300_uart_scode < 0 \|\| hp300_uart_scode > DIO_SCMAX)
	return 0;

	if (DIO_SCINHOLE(hp300_uart_scode))
	return 0;

	scode = hp300_uart_scode;

	/* Memory mapped I/O */
	port.iotype = UPIO_MEM;
	port.flags = UPF_SKIP_TEST \| UPF_SHARE_IRQ \| UPF_BOOT_AUTOCONF;
	port.type = PORT_UNKNOWN;

	/* Check for APCI console */
	if (scode == 256) {
	#ifdef CONFIG_HPAPCI
	printk(KERN_INFO "Serial console is HP APCI 1\n");

	port.uartclk = HPAPCI_BAUD_BASE * 16;
	port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1));
	port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
	port.regshift = 2;
	add_preferred_console("ttyS", port.line, "9600n8");
	#else
	printk(KERN_WARNING "Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n");
	return 0;
	#endif
	} else {
	#ifdef CONFIG_HPDCA
	unsigned long pa = dio_scodetophysaddr(scode);
	if (!pa)
	return 0;

	printk(KERN_INFO "Serial console is HP DCA at select code %d\n", scode);

	port.uartclk = HPDCA_BAUD_BASE * 16;
	port.mapbase = (pa + UART_OFFSET);
	port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
	port.regshift = 1;
	port.irq = DIO_IPL(pa + DIO_VIRADDRBASE);

	/* Enable board-interrupts */
	out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);

	if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80)
	add_preferred_console("ttyS", port.line, "9600n8");
	#else
	printk(KERN_WARNING "Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
	return 0;
	#endif
	}

	if (early_serial_setup(&port) < 0)
	printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n");
	return 0;
	}
	#endif /* CONFIG_SERIAL_8250_CONSOLE */

	#ifdef CONFIG_HPDCA
	static int hpdca_init_one(struct dio_dev *d,
	const struct dio_device_id *ent)
	{
	struct uart_8250_port uart;
	int line;

	#ifdef CONFIG_SERIAL_8250_CONSOLE
	if (hp300_uart_scode == d->scode) {
	/* Already got it. */
	return 0;
	}
	#endif
	memset(&uart, 0, sizeof(uart));

	/* Memory mapped I/O */
	uart.port.iotype = UPIO_MEM;
	uart.port.flags = UPF_SKIP_TEST \| UPF_SHARE_IRQ \| UPF_BOOT_AUTOCONF;
	uart.port.irq = d->ipl;
	uart.port.uartclk = HPDCA_BAUD_BASE * 16;
	uart.port.mapbase = (d->resource.start + UART_OFFSET);
	uart.port.membase = (char *)(uart.port.mapbase + DIO_VIRADDRBASE);
	uart.port.regshift = 1;
	uart.port.dev = &d->dev;
	line = serial8250_register_8250_port(&uart);

	if (line < 0) {
	printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
	" irq %d failed\n", d->scode, uart.port.irq);
	return -ENOMEM;
	}

	/* Enable board-interrupts */
	out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
	dio_set_drvdata(d, (void *)line);

	/* Reset the DCA */
	out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
	udelay(100);

	num_ports++;

	return 0;
	}
	#endif

	static int __init hp300_8250_init(void)
	{
	static int called;
	#ifdef CONFIG_HPAPCI
	int line;
	unsigned long base;
	struct uart_8250_port uart;
	struct hp300_port *port;
	int i;
	#endif
	if (called)
	return -ENODEV;
	called = 1;

	if (!MACH_IS_HP300)
	return -ENODEV;

	#ifdef CONFIG_HPDCA
	dio_register_driver(&hpdca_driver);
	#endif
	#ifdef CONFIG_HPAPCI
	if (hp300_model < HP_400) {
	if (!num_ports)
	return -ENODEV;
	return 0;
	}
	/* These models have the Frodo chip.
	* Port 0 is reserved for the Apollo Domain keyboard.
	* Port 1 is either the console or the DCA.
	*/
	for (i = 1; i < 4; i++) {
	/* Port 1 is the console on a 425e, on other machines it's
	* mapped to DCA.
	*/
	#ifdef CONFIG_SERIAL_8250_CONSOLE
	if (i == 1)
	continue;
	#endif

	/* Create new serial device */
	port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL);
	if (!port)
	return -ENOMEM;

	memset(&uart, 0, sizeof(uart));

	base = (FRODO_BASE + FRODO_APCI_OFFSET(i));

	/* Memory mapped I/O */
	uart.port.iotype = UPIO_MEM;
	uart.port.flags = UPF_SKIP_TEST \| UPF_SHARE_IRQ \
	\| UPF_BOOT_AUTOCONF;
	/* XXX - no interrupt support yet */
	uart.port.irq = 0;
	uart.port.uartclk = HPAPCI_BAUD_BASE * 16;
	uart.port.mapbase = base;
	uart.port.membase = (char *)(base + DIO_VIRADDRBASE);
	uart.port.regshift = 2;

	line = serial8250_register_8250_port(&uart);

	if (line < 0) {
	printk(KERN_NOTICE "8250_hp300: register_serial() APCI"
	" %d irq %d failed\n", i, uart.port.irq);
	kfree(port);
	continue;
	}

	port->line = line;
	port->next = hp300_ports;
	hp300_ports = port;

	num_ports++;
	}
	#endif

	/* Any boards found? */
	if (!num_ports)
	return -ENODEV;

	return 0;
	}

	#ifdef CONFIG_HPDCA
	static void hpdca_remove_one(struct dio_dev *d)
	{
	int line;

	line = (int) dio_get_drvdata(d);
	if (d->resource.start) {
	/* Disable board-interrupts */
	out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
	}
	serial8250_unregister_port(line);
	}
	#endif

	static void __exit hp300_8250_exit(void)
	{
	#ifdef CONFIG_HPAPCI
	struct hp300_port port, to_free;

	for (port = hp300_ports; port; ) {
	serial8250_unregister_port(port->line);
	to_free = port;
	port = port->next;
	kfree(to_free);
	}

	hp300_ports = NULL;
	#endif
	#ifdef CONFIG_HPDCA
	dio_unregister_driver(&hpdca_driver);
	#endif
	}

	module_init(hp300_8250_init);
	module_exit(hp300_8250_exit);
	MODULE_DESCRIPTION("HP DCA/APCI serial driver");
	MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
	MODULE_LICENSE("GPL");