[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/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

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);

	return 0;
}
#endif

static int __init hp300_8250_init(void)
{
	static int called = 0;
	int num_ports;
#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;

	num_ports = 0;

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