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/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 <jongk@linux-m68k.org>");
MODULE_LICENSE("GPL");
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>
12	#include <linux/serial.h>
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
19	#include "8250.h"
20
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	{
166	struct uart_port port;
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
175	memset(&port, 0, sizeof(struct uart_port));
176
177	/* Memory mapped I/O */
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);
187
188	if (line < 0) {
189	printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
190	" irq %d failed\n", d->scode, port.irq);
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;
213	struct uart_port uport;
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
255	memset(&uport, 0, sizeof(struct uart_port));
256
257	base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
258
259	/* Memory mapped I/O */
260	uport.iotype = UPIO_MEM;
261	uport.flags = UPF_SKIP_TEST \| UPF_SHARE_IRQ \| UPF_BOOT_AUTOCONF;
262	/* XXX - no interrupt support yet */
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;
268
269	line = serial8250_register_port(&uport);
270
271	if (line < 0) {
272	printk(KERN_NOTICE "8250_hp300: register_serial() APCI %d"
273	" irq %d failed\n", i, uport.irq);
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	}
303	serial8250_unregister_port(line);
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; ) {
313	serial8250_unregister_port(port->line);
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 <jongk@linux-m68k.org>");
330	MODULE_LICENSE("GPL");