[linux-2.6] / drivers / serial / 8250_hp300.c

/*
 * 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 <asm/io.h>

#include "8250.h"

#if !defined(CONFIG_HPDCA) && !defined(CONFIG_HPAPCI)
#warning CONFIG_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 __devinit hpdca_init_one(struct dio_dev *d,
					const struct dio_device_id *ent);
static void __devexit 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    = __devexit_p(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.
 * This function should be called before serial_console_init() is called
 * to make sure the serial console will be available for use. IA-64 kernel
 * calls this function from setup_arch() after the EFI and ACPI tables have
 * been parsed.
 */
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 __devinit hpdca_init_one(struct dio_dev *d,
				const struct dio_device_id *ent)
{
	struct uart_port port;
	int line;

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

	/* Memory mapped I/O */
	port.iotype = UPIO_MEM;
	port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
	port.irq = d->ipl;
	port.uartclk = HPDCA_BAUD_BASE * 16;
	port.mapbase = (d->resource.start + UART_OFFSET);
	port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
	port.regshift = 1;
	port.dev = &d->dev;
	line = serial8250_register_port(&port);

	if (line < 0) {
		printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
		       " irq %d failed\n", d->scode, 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_port uport;
	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(&uport, 0, sizeof(struct uart_port));

		base = (FRODO_BASE + FRODO_APCI_OFFSET(i));

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

		line = serial8250_register_port(&uport);

		if (line < 0) {
			printk(KERN_NOTICE "8250_hp300: register_serial() APCI"
			       " %d irq %d failed\n", i, uport.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 __devexit 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");
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Driver for the 98626/98644/internal serial interface on hp300/hp400
	3	* (based on the National Semiconductor INS8250/NS16550AF/WD16C552 UARTs)
	4	*
	5	* Ported from 2.2 and modified to use the normal 8250 driver
	6	* by Kars de Jong <jongk@linux-m68k.org>, May 2004.
	7	*/
	8	#include <linux/module.h>
	9	#include <linux/init.h>
	10	#include <linux/string.h>
	11	#include <linux/kernel.h>
1da177e4	12	#include <linux/serial.h>
1da177e4	13	#include <linux/serial_core.h>
b187f180	14	#include <linux/serial_8250.h>
1da177e4 LT	15	#include <linux/delay.h>
	16	#include <linux/dio.h>
	17	#include <linux/console.h>
	18	#include <asm/io.h>
	19
2b49abac RK	20	#include "8250.h"
2b49abac RK	21
1da177e4 LT	22	#if !defined(CONFIG_HPDCA) && !defined(CONFIG_HPAPCI)
	23	#warning CONFIG_8250 defined but neither CONFIG_HPDCA nor CONFIG_HPAPCI defined, are you sure?
	24	#endif
	25
	26	#ifdef CONFIG_HPAPCI
	27	struct hp300_port
	28	{
	29	struct hp300_port next; / next port */
	30	int line; /* line (tty) number */
	31	};
	32
	33	static struct hp300_port *hp300_ports;
	34	#endif
	35
	36	#ifdef CONFIG_HPDCA
	37
	38	static int __devinit hpdca_init_one(struct dio_dev *d,
0fe1c137	39	const struct dio_device_id *ent);
1da177e4 LT	40	static void __devexit hpdca_remove_one(struct dio_dev *d);
	41
	42	static struct dio_device_id hpdca_dio_tbl[] = {
	43	{ DIO_ID_DCA0 },
	44	{ DIO_ID_DCA0REM },
	45	{ DIO_ID_DCA1 },
	46	{ DIO_ID_DCA1REM },
	47	{ 0 }
	48	};
	49
	50	static struct dio_driver hpdca_driver = {
	51	.name = "hpdca",
	52	.id_table = hpdca_dio_tbl,
	53	.probe = hpdca_init_one,
	54	.remove = __devexit_p(hpdca_remove_one),
	55	};
	56
	57	#endif
	58
e51c01b0 BH	59	static unsigned int num_ports;
e51c01b0 BH	60
1da177e4 LT	61	extern int hp300_uart_scode;
	62
	63	/* Offset to UART registers from base of DCA */
	64	#define UART_OFFSET 17
	65
	66	#define DCA_ID 0x01 /* ID (read), reset (write) */
	67	#define DCA_IC 0x03 /* Interrupt control */
	68
	69	/* Interrupt control */
	70	#define DCA_IC_IE 0x80 /* Master interrupt enable */
	71
	72	#define HPDCA_BAUD_BASE 153600
	73
	74	/* Base address of the Frodo part */
	75	#define FRODO_BASE (0x41c000)
	76
	77	/*
	78	* Where we find the 8250-like APCI ports, and how far apart they are.
	79	*/
	80	#define FRODO_APCIBASE 0x0
	81	#define FRODO_APCISPACE 0x20
	82	#define FRODO_APCI_OFFSET(x) (FRODO_APCIBASE + ((x) * FRODO_APCISPACE))
	83
	84	#define HPAPCI_BAUD_BASE 500400
	85
	86	#ifdef CONFIG_SERIAL_8250_CONSOLE
	87	/*
0fe1c137	88	* Parse the bootinfo to find descriptions for headless console and
1da177e4 LT	89	* debug serial ports and register them with the 8250 driver.
	90	* This function should be called before serial_console_init() is called
	91	* to make sure the serial console will be available for use. IA-64 kernel
	92	* calls this function from setup_arch() after the EFI and ACPI tables have
	93	* been parsed.
	94	*/
	95	int __init hp300_setup_serial_console(void)
	96	{
	97	int scode;
	98	struct uart_port port;
	99
	100	memset(&port, 0, sizeof(port));
	101
	102	if (hp300_uart_scode < 0 \|\| hp300_uart_scode > DIO_SCMAX)
	103	return 0;
	104
	105	if (DIO_SCINHOLE(hp300_uart_scode))
	106	return 0;
	107
	108	scode = hp300_uart_scode;
	109
	110	/* Memory mapped I/O */
	111	port.iotype = UPIO_MEM;
	112	port.flags = UPF_SKIP_TEST \| UPF_SHARE_IRQ \| UPF_BOOT_AUTOCONF;
	113	port.type = PORT_UNKNOWN;
	114
	115	/* Check for APCI console */
	116	if (scode == 256) {
	117	#ifdef CONFIG_HPAPCI
	118	printk(KERN_INFO "Serial console is HP APCI 1\n");
	119
	120	port.uartclk = HPAPCI_BAUD_BASE * 16;
	121	port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1));
	122	port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
	123	port.regshift = 2;
	124	add_preferred_console("ttyS", port.line, "9600n8");
	125	#else
	126	printk(KERN_WARNING "Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n");
	127	return 0;
	128	#endif
0fe1c137	129	} else {
1da177e4 LT	130	#ifdef CONFIG_HPDCA
1da177e4 LT	131	unsigned long pa = dio_scodetophysaddr(scode);
0fe1c137	132	if (!pa)
1da177e4	133	return 0;
1da177e4 LT	134
	135	printk(KERN_INFO "Serial console is HP DCA at select code %d\n", scode);
	136
	137	port.uartclk = HPDCA_BAUD_BASE * 16;
	138	port.mapbase = (pa + UART_OFFSET);
	139	port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
	140	port.regshift = 1;
	141	port.irq = DIO_IPL(pa + DIO_VIRADDRBASE);
	142
	143	/* Enable board-interrupts */
	144	out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
	145
0fe1c137	146	if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80)
1da177e4	147	add_preferred_console("ttyS", port.line, "9600n8");
1da177e4 LT	148	#else
	149	printk(KERN_WARNING "Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
	150	return 0;
	151	#endif
	152	}
	153
0fe1c137	154	if (early_serial_setup(&port) < 0)
1da177e4	155	printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n");
1da177e4 LT	156	return 0;
	157	}
	158	#endif /* CONFIG_SERIAL_8250_CONSOLE */
	159
	160	#ifdef CONFIG_HPDCA
	161	static int __devinit hpdca_init_one(struct dio_dev *d,
0fe1c137	162	const struct dio_device_id *ent)
1da177e4	163	{
2b49abac	164	struct uart_port port;
1da177e4 LT	165	int line;
	166
	167	#ifdef CONFIG_SERIAL_8250_CONSOLE
	168	if (hp300_uart_scode == d->scode) {
	169	/* Already got it. */
	170	return 0;
	171	}
	172	#endif
2b49abac	173	memset(&port, 0, sizeof(struct uart_port));
1da177e4 LT	174
1da177e4 LT	175	/* Memory mapped I/O */
2b49abac RK	176	port.iotype = UPIO_MEM;
	177	port.flags = UPF_SKIP_TEST \| UPF_SHARE_IRQ \| UPF_BOOT_AUTOCONF;
	178	port.irq = d->ipl;
	179	port.uartclk = HPDCA_BAUD_BASE * 16;
	180	port.mapbase = (d->resource.start + UART_OFFSET);
	181	port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
	182	port.regshift = 1;
	183	port.dev = &d->dev;
	184	line = serial8250_register_port(&port);
1da177e4 LT	185
	186	if (line < 0) {
	187	printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
2b49abac	188	" irq %d failed\n", d->scode, port.irq);
1da177e4 LT	189	return -ENOMEM;
	190	}
	191
	192	/* Enable board-interrupts */
	193	out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
	194	dio_set_drvdata(d, (void *)line);
	195
	196	/* Reset the DCA */
	197	out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
	198	udelay(100);
	199
e51c01b0 BH	200	num_ports++;
e51c01b0 BH	201
1da177e4 LT	202	return 0;
	203	}
	204	#endif
	205
	206	static int __init hp300_8250_init(void)
	207	{
0fe1c137	208	static int called;
1da177e4 LT	209	#ifdef CONFIG_HPAPCI
	210	int line;
	211	unsigned long base;
2b49abac	212	struct uart_port uport;
1da177e4 LT	213	struct hp300_port *port;
	214	int i;
	215	#endif
	216	if (called)
	217	return -ENODEV;
	218	called = 1;
	219
	220	if (!MACH_IS_HP300)
	221	return -ENODEV;
	222
1da177e4	223	#ifdef CONFIG_HPDCA
e51c01b0	224	dio_register_driver(&hpdca_driver);
1da177e4 LT	225	#endif
	226	#ifdef CONFIG_HPAPCI
	227	if (hp300_model < HP_400) {
	228	if (!num_ports)
	229	return -ENODEV;
	230	return 0;
	231	}
	232	/* These models have the Frodo chip.
	233	* Port 0 is reserved for the Apollo Domain keyboard.
	234	* Port 1 is either the console or the DCA.
	235	*/
	236	for (i = 1; i < 4; i++) {
0fe1c137 AC	237	/* Port 1 is the console on a 425e, on other machines it's
0fe1c137 AC	238	* mapped to DCA.
1da177e4 LT	239	*/
1da177e4 LT	240	#ifdef CONFIG_SERIAL_8250_CONSOLE
0fe1c137	241	if (i == 1)
1da177e4	242	continue;
1da177e4 LT	243	#endif
	244
	245	/* Create new serial device */
	246	port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL);
	247	if (!port)
	248	return -ENOMEM;
	249
2b49abac	250	memset(&uport, 0, sizeof(struct uart_port));
1da177e4 LT	251
	252	base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
	253
	254	/* Memory mapped I/O */
2b49abac	255	uport.iotype = UPIO_MEM;
0fe1c137 AC	256	uport.flags = UPF_SKIP_TEST \| UPF_SHARE_IRQ \
0fe1c137 AC	257	\| UPF_BOOT_AUTOCONF;
1da177e4	258	/* XXX - no interrupt support yet */
2b49abac RK	259	uport.irq = 0;
	260	uport.uartclk = HPAPCI_BAUD_BASE * 16;
	261	uport.mapbase = base;
	262	uport.membase = (char *)(base + DIO_VIRADDRBASE);
	263	uport.regshift = 2;
1da177e4	264
2b49abac	265	line = serial8250_register_port(&uport);
1da177e4 LT	266
1da177e4 LT	267	if (line < 0) {
0fe1c137 AC	268	printk(KERN_NOTICE "8250_hp300: register_serial() APCI"
0fe1c137 AC	269	" %d irq %d failed\n", i, uport.irq);
1da177e4 LT	270	kfree(port);
	271	continue;
	272	}
	273
	274	port->line = line;
	275	port->next = hp300_ports;
	276	hp300_ports = port;
	277
	278	num_ports++;
	279	}
	280	#endif
	281
	282	/* Any boards found? */
	283	if (!num_ports)
	284	return -ENODEV;
	285
	286	return 0;
	287	}
	288
	289	#ifdef CONFIG_HPDCA
	290	static void __devexit hpdca_remove_one(struct dio_dev *d)
	291	{
	292	int line;
	293
	294	line = (int) dio_get_drvdata(d);
	295	if (d->resource.start) {
	296	/* Disable board-interrupts */
	297	out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
	298	}
2b49abac	299	serial8250_unregister_port(line);
1da177e4 LT	300	}
	301	#endif
	302
	303	static void __exit hp300_8250_exit(void)
	304	{
	305	#ifdef CONFIG_HPAPCI
	306	struct hp300_port port, to_free;
	307
	308	for (port = hp300_ports; port; ) {
2b49abac	309	serial8250_unregister_port(port->line);
1da177e4 LT	310	to_free = port;
	311	port = port->next;
	312	kfree(to_free);
	313	}
	314
	315	hp300_ports = NULL;
	316	#endif
	317	#ifdef CONFIG_HPDCA
	318	dio_unregister_driver(&hpdca_driver);
	319	#endif
	320	}
	321
	322	module_init(hp300_8250_init);
	323	module_exit(hp300_8250_exit);
	324	MODULE_DESCRIPTION("HP DCA/APCI serial driver");
	325	MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
	326	MODULE_LICENSE("GPL");