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_8250.h>
14#include <linux/delay.h>
15#include <linux/dio.h>
16#include <linux/console.h>
17#include <linux/slab.h>
18#include <asm/io.h>
19
20#include "8250.h"
21
22#if !defined(CONFIG_HPDCA) && !defined(CONFIG_HPAPCI)
23#warning CONFIG_SERIAL_8250 defined but neither CONFIG_HPDCA nor CONFIG_HPAPCI defined, are you sure?
24#endif
25
26#ifdef CONFIG_HPAPCI
27struct hp300_port
28{
29	struct hp300_port *next;	/* next port */
30	int line;			/* line (tty) number */
31};
32
33static struct hp300_port *hp300_ports;
34#endif
35
36#ifdef CONFIG_HPDCA
37
38static int hpdca_init_one(struct dio_dev *d,
39					const struct dio_device_id *ent);
40static void hpdca_remove_one(struct dio_dev *d);
41
42static 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
50static struct dio_driver hpdca_driver = {
51	.name      = "hpdca",
52	.id_table  = hpdca_dio_tbl,
53	.probe     = hpdca_init_one,
54	.remove    = hpdca_remove_one,
55};
56
57#endif
58
59static unsigned int num_ports;
60
61extern 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 */
91int __init hp300_setup_serial_console(void)
92{
93	int scode;
94	struct uart_port port;
95
96	memset(&port, 0, sizeof(port));
97
98	if (hp300_uart_scode < 0 || hp300_uart_scode > DIO_SCMAX)
99		return 0;
100
101	if (DIO_SCINHOLE(hp300_uart_scode))
102		return 0;
103
104	scode = hp300_uart_scode;
105
106	/* Memory mapped I/O */
107	port.iotype = UPIO_MEM;
108	port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
109	port.type = PORT_UNKNOWN;
110
111	/* Check for APCI console */
112	if (scode == 256) {
113#ifdef CONFIG_HPAPCI
114		printk(KERN_INFO "Serial console is HP APCI 1\n");
115
116		port.uartclk = HPAPCI_BAUD_BASE * 16;
117		port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1));
118		port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
119		port.regshift = 2;
120		add_preferred_console("ttyS", port.line, "9600n8");
121#else
122		printk(KERN_WARNING "Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n");
123		return 0;
124#endif
125	} else {
126#ifdef CONFIG_HPDCA
127		unsigned long pa = dio_scodetophysaddr(scode);
128		if (!pa)
129			return 0;
130
131		printk(KERN_INFO "Serial console is HP DCA at select code %d\n", scode);
132
133		port.uartclk = HPDCA_BAUD_BASE * 16;
134		port.mapbase = (pa + UART_OFFSET);
135		port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
136		port.regshift = 1;
137		port.irq = DIO_IPL(pa + DIO_VIRADDRBASE);
138
139		/* Enable board-interrupts */
140		out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
141
142		if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80)
143			add_preferred_console("ttyS", port.line, "9600n8");
144#else
145		printk(KERN_WARNING "Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
146		return 0;
147#endif
148	}
149
150	if (early_serial_setup(&port) < 0)
151		printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n");
152	return 0;
153}
154#endif /* CONFIG_SERIAL_8250_CONSOLE */
155
156#ifdef CONFIG_HPDCA
157static int hpdca_init_one(struct dio_dev *d,
158				const struct dio_device_id *ent)
159{
160	struct uart_8250_port uart;
161	int line;
162
163#ifdef CONFIG_SERIAL_8250_CONSOLE
164	if (hp300_uart_scode == d->scode) {
165		/* Already got it. */
166		return 0;
167	}
168#endif
169	memset(&uart, 0, sizeof(uart));
170
171	/* Memory mapped I/O */
172	uart.port.iotype = UPIO_MEM;
173	uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
174	uart.port.irq = d->ipl;
175	uart.port.uartclk = HPDCA_BAUD_BASE * 16;
176	uart.port.mapbase = (d->resource.start + UART_OFFSET);
177	uart.port.membase = (char *)(uart.port.mapbase + DIO_VIRADDRBASE);
178	uart.port.regshift = 1;
179	uart.port.dev = &d->dev;
180	line = serial8250_register_8250_port(&uart);
181
182	if (line < 0) {
183		printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
184		       " irq %d failed\n", d->scode, uart.port.irq);
185		return -ENOMEM;
186	}
187
188	/* Enable board-interrupts */
189	out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
190	dio_set_drvdata(d, (void *)line);
191
192	/* Reset the DCA */
193	out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
194	udelay(100);
195
196	num_ports++;
197
198	return 0;
199}
200#endif
201
202static int __init hp300_8250_init(void)
203{
204	static int called;
205#ifdef CONFIG_HPAPCI
206	int line;
207	unsigned long base;
208	struct uart_8250_port uart;
209	struct hp300_port *port;
210	int i;
211#endif
212	if (called)
213		return -ENODEV;
214	called = 1;
215
216	if (!MACH_IS_HP300)
217		return -ENODEV;
218
219#ifdef CONFIG_HPDCA
220	dio_register_driver(&hpdca_driver);
221#endif
222#ifdef CONFIG_HPAPCI
223	if (hp300_model < HP_400) {
224		if (!num_ports)
225			return -ENODEV;
226		return 0;
227	}
228	/* These models have the Frodo chip.
229	 * Port 0 is reserved for the Apollo Domain keyboard.
230	 * Port 1 is either the console or the DCA.
231	 */
232	for (i = 1; i < 4; i++) {
233		/* Port 1 is the console on a 425e, on other machines it's
234		 * mapped to DCA.
235		 */
236#ifdef CONFIG_SERIAL_8250_CONSOLE
237		if (i == 1)
238			continue;
239#endif
240
241		/* Create new serial device */
242		port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL);
243		if (!port)
244			return -ENOMEM;
245
246		memset(&uart, 0, sizeof(uart));
247
248		base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
249
250		/* Memory mapped I/O */
251		uart.port.iotype = UPIO_MEM;
252		uart.port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ \
253			      | UPF_BOOT_AUTOCONF;
254		/* XXX - no interrupt support yet */
255		uart.port.irq = 0;
256		uart.port.uartclk = HPAPCI_BAUD_BASE * 16;
257		uart.port.mapbase = base;
258		uart.port.membase = (char *)(base + DIO_VIRADDRBASE);
259		uart.port.regshift = 2;
260
261		line = serial8250_register_8250_port(&uart);
262
263		if (line < 0) {
264			printk(KERN_NOTICE "8250_hp300: register_serial() APCI"
265			       " %d irq %d failed\n", i, uart.port.irq);
266			kfree(port);
267			continue;
268		}
269
270		port->line = line;
271		port->next = hp300_ports;
272		hp300_ports = port;
273
274		num_ports++;
275	}
276#endif
277
278	/* Any boards found? */
279	if (!num_ports)
280		return -ENODEV;
281
282	return 0;
283}
284
285#ifdef CONFIG_HPDCA
286static void hpdca_remove_one(struct dio_dev *d)
287{
288	int line;
289
290	line = (int) dio_get_drvdata(d);
291	if (d->resource.start) {
292		/* Disable board-interrupts */
293		out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
294	}
295	serial8250_unregister_port(line);
296}
297#endif
298
299static void __exit hp300_8250_exit(void)
300{
301#ifdef CONFIG_HPAPCI
302	struct hp300_port *port, *to_free;
303
304	for (port = hp300_ports; port; ) {
305		serial8250_unregister_port(port->line);
306		to_free = port;
307		port = port->next;
308		kfree(to_free);
309	}
310
311	hp300_ports = NULL;
312#endif
313#ifdef CONFIG_HPDCA
314	dio_unregister_driver(&hpdca_driver);
315#endif
316}
317
318module_init(hp300_8250_init);
319module_exit(hp300_8250_exit);
320MODULE_DESCRIPTION("HP DCA/APCI serial driver");
321MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
322MODULE_LICENSE("GPL");
323