[linux.git] / 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 <[email protected]>, 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 = 0;
#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 <[email protected]>");
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 <[email protected]>, 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,
	39	const struct dio_device_id *ent);
	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	/*
	88	* Parse the bootinfo to find descriptions for headless console and
	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
129	}
130	else {
131	#ifdef CONFIG_HPDCA
132	unsigned long pa = dio_scodetophysaddr(scode);
133	if (!pa) {
134	return 0;
135	}
136
137	printk(KERN_INFO "Serial console is HP DCA at select code %d\n", scode);
138
139	port.uartclk = HPDCA_BAUD_BASE * 16;
140	port.mapbase = (pa + UART_OFFSET);
141	port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
142	port.regshift = 1;
143	port.irq = DIO_IPL(pa + DIO_VIRADDRBASE);
144
145	/* Enable board-interrupts */
146	out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
147
148	if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80) {
149	add_preferred_console("ttyS", port.line, "9600n8");
150	}
151	#else
152	printk(KERN_WARNING "Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
153	return 0;
154	#endif
155	}
156
157	if (early_serial_setup(&port) < 0) {
158	printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n");
159	}
160
161	return 0;
162	}
163	#endif /* CONFIG_SERIAL_8250_CONSOLE */
164
165	#ifdef CONFIG_HPDCA
166	static int __devinit hpdca_init_one(struct dio_dev *d,
167	const struct dio_device_id *ent)
168	{
2b49abac	169	struct uart_port port;
1da177e4 LT	170	int line;
	171
	172	#ifdef CONFIG_SERIAL_8250_CONSOLE
	173	if (hp300_uart_scode == d->scode) {
	174	/* Already got it. */
	175	return 0;
	176	}
	177	#endif
2b49abac	178	memset(&port, 0, sizeof(struct uart_port));
1da177e4 LT	179
1da177e4 LT	180	/* Memory mapped I/O */
2b49abac RK	181	port.iotype = UPIO_MEM;
	182	port.flags = UPF_SKIP_TEST \| UPF_SHARE_IRQ \| UPF_BOOT_AUTOCONF;
	183	port.irq = d->ipl;
	184	port.uartclk = HPDCA_BAUD_BASE * 16;
	185	port.mapbase = (d->resource.start + UART_OFFSET);
	186	port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
	187	port.regshift = 1;
	188	port.dev = &d->dev;
	189	line = serial8250_register_port(&port);
1da177e4 LT	190
	191	if (line < 0) {
	192	printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
2b49abac	193	" irq %d failed\n", d->scode, port.irq);
1da177e4 LT	194	return -ENOMEM;
	195	}
	196
	197	/* Enable board-interrupts */
	198	out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
	199	dio_set_drvdata(d, (void *)line);
	200
	201	/* Reset the DCA */
	202	out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
	203	udelay(100);
	204
e51c01b0 BH	205	num_ports++;
e51c01b0 BH	206
1da177e4 LT	207	return 0;
	208	}
	209	#endif
	210
	211	static int __init hp300_8250_init(void)
	212	{
	213	static int called = 0;
1da177e4 LT	214	#ifdef CONFIG_HPAPCI
	215	int line;
	216	unsigned long base;
2b49abac	217	struct uart_port uport;
1da177e4 LT	218	struct hp300_port *port;
	219	int i;
	220	#endif
	221	if (called)
	222	return -ENODEV;
	223	called = 1;
	224
	225	if (!MACH_IS_HP300)
	226	return -ENODEV;
	227
1da177e4	228	#ifdef CONFIG_HPDCA
e51c01b0	229	dio_register_driver(&hpdca_driver);
1da177e4 LT	230	#endif
	231	#ifdef CONFIG_HPAPCI
	232	if (hp300_model < HP_400) {
	233	if (!num_ports)
	234	return -ENODEV;
	235	return 0;
	236	}
	237	/* These models have the Frodo chip.
	238	* Port 0 is reserved for the Apollo Domain keyboard.
	239	* Port 1 is either the console or the DCA.
	240	*/
	241	for (i = 1; i < 4; i++) {
	242	/* Port 1 is the console on a 425e, on other machines it's mapped to
	243	* DCA.
	244	*/
	245	#ifdef CONFIG_SERIAL_8250_CONSOLE
	246	if (i == 1) {
	247	continue;
	248	}
	249	#endif
	250
	251	/* Create new serial device */
	252	port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL);
	253	if (!port)
	254	return -ENOMEM;
	255
2b49abac	256	memset(&uport, 0, sizeof(struct uart_port));
1da177e4 LT	257
	258	base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
	259
	260	/* Memory mapped I/O */
2b49abac RK	261	uport.iotype = UPIO_MEM;
2b49abac RK	262	uport.flags = UPF_SKIP_TEST \| UPF_SHARE_IRQ \| UPF_BOOT_AUTOCONF;
1da177e4	263	/* XXX - no interrupt support yet */
2b49abac RK	264	uport.irq = 0;
	265	uport.uartclk = HPAPCI_BAUD_BASE * 16;
	266	uport.mapbase = base;
	267	uport.membase = (char *)(base + DIO_VIRADDRBASE);
	268	uport.regshift = 2;
1da177e4	269
2b49abac	270	line = serial8250_register_port(&uport);
1da177e4 LT	271
	272	if (line < 0) {
	273	printk(KERN_NOTICE "8250_hp300: register_serial() APCI %d"
2b49abac	274	" irq %d failed\n", i, uport.irq);
1da177e4 LT	275	kfree(port);
	276	continue;
	277	}
	278
	279	port->line = line;
	280	port->next = hp300_ports;
	281	hp300_ports = port;
	282
	283	num_ports++;
	284	}
	285	#endif
	286
	287	/* Any boards found? */
	288	if (!num_ports)
	289	return -ENODEV;
	290
	291	return 0;
	292	}
	293
	294	#ifdef CONFIG_HPDCA
	295	static void __devexit hpdca_remove_one(struct dio_dev *d)
	296	{
	297	int line;
	298
	299	line = (int) dio_get_drvdata(d);
	300	if (d->resource.start) {
	301	/* Disable board-interrupts */
	302	out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
	303	}
2b49abac	304	serial8250_unregister_port(line);
1da177e4 LT	305	}
	306	#endif
	307
	308	static void __exit hp300_8250_exit(void)
	309	{
	310	#ifdef CONFIG_HPAPCI
	311	struct hp300_port port, to_free;
	312
	313	for (port = hp300_ports; port; ) {
2b49abac	314	serial8250_unregister_port(port->line);
1da177e4 LT	315	to_free = port;
	316	port = port->next;
	317	kfree(to_free);
	318	}
	319
	320	hp300_ports = NULL;
	321	#endif
	322	#ifdef CONFIG_HPDCA
	323	dio_unregister_driver(&hpdca_driver);
	324	#endif
	325	}
	326
	327	module_init(hp300_8250_init);
	328	module_exit(hp300_8250_exit);
	329	MODULE_DESCRIPTION("HP DCA/APCI serial driver");
	330	MODULE_AUTHOR("Kars de Jong <[email protected]>");
	331	MODULE_LICENSE("GPL");