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
26struct hp300_port
27{
28	struct hp300_port *next;	/* next port */
29	int line;			/* line (tty) number */
30};
31
32static struct hp300_port *hp300_ports;
33#endif
34
35#ifdef CONFIG_HPDCA
36
37static int __devinit hpdca_init_one(struct dio_dev *d,
38                                const struct dio_device_id *ent);
39static void __devexit hpdca_remove_one(struct dio_dev *d);
40
41static 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
49static 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
58static unsigned int num_ports;
59
60extern int hp300_uart_scode;
61
62/* Offset to UART registers from base of DCA */
63#define UART_OFFSET	17
64
65#define DCA_ID		0x01	/* ID (read), reset (write) */
66#define DCA_IC		0x03	/* Interrupt control        */
67
68/* Interrupt control */
69#define DCA_IC_IE	0x80	/* Master interrupt enable  */
70
71#define HPDCA_BAUD_BASE 153600
72
73/* Base address of the Frodo part */
74#define FRODO_BASE	(0x41c000)
75
76/*
77 * Where we find the 8250-like APCI ports, and how far apart they are.
78 */
79#define FRODO_APCIBASE		0x0
80#define FRODO_APCISPACE		0x20
81#define FRODO_APCI_OFFSET(x)	(FRODO_APCIBASE + ((x) * FRODO_APCISPACE))
82
83#define HPAPCI_BAUD_BASE 500400
84
85#ifdef CONFIG_SERIAL_8250_CONSOLE
86/*
87 * Parse the bootinfo to find descriptions for headless console and
88 * debug serial ports and register them with the 8250 driver.
89 * This function should be called before serial_console_init() is called
90 * to make sure the serial console will be available for use. IA-64 kernel
91 * calls this function from setup_arch() after the EFI and ACPI tables have
92 * been parsed.
93 */
94int __init hp300_setup_serial_console(void)
95{
96	int scode;
97	struct uart_port port;
98
99	memset(&port, 0, sizeof(port));
100
101	if (hp300_uart_scode < 0 || hp300_uart_scode > DIO_SCMAX)
102		return 0;
103
104	if (DIO_SCINHOLE(hp300_uart_scode))
105		return 0;
106
107	scode = hp300_uart_scode;
108
109	/* Memory mapped I/O */
110	port.iotype = UPIO_MEM;
111	port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
112	port.type = PORT_UNKNOWN;
113
114	/* Check for APCI console */
115	if (scode == 256) {
116#ifdef CONFIG_HPAPCI
117		printk(KERN_INFO "Serial console is HP APCI 1\n");
118
119		port.uartclk = HPAPCI_BAUD_BASE * 16;
120		port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1));
121		port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
122		port.regshift = 2;
123		add_preferred_console("ttyS", port.line, "9600n8");
124#else
125		printk(KERN_WARNING "Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n");
126		return 0;
127#endif
128	}
129	else {
130#ifdef CONFIG_HPDCA
131		unsigned long pa = dio_scodetophysaddr(scode);
132		if (!pa) {
133			return 0;
134		}
135
136		printk(KERN_INFO "Serial console is HP DCA at select code %d\n", scode);
137
138		port.uartclk = HPDCA_BAUD_BASE * 16;
139		port.mapbase = (pa + UART_OFFSET);
140		port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
141		port.regshift = 1;
142		port.irq = DIO_IPL(pa + DIO_VIRADDRBASE);
143
144		/* Enable board-interrupts */
145		out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
146
147		if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80) {
148			add_preferred_console("ttyS", port.line, "9600n8");
149		}
150#else
151		printk(KERN_WARNING "Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
152		return 0;
153#endif
154	}
155
156	if (early_serial_setup(&port) < 0) {
157		printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n");
158	}
159
160	return 0;
161}
162#endif /* CONFIG_SERIAL_8250_CONSOLE */
163
164#ifdef CONFIG_HPDCA
165static int __devinit hpdca_init_one(struct dio_dev *d,
166                                const struct dio_device_id *ent)
167{
168	struct uart_port port;
169	int line;
170
171#ifdef CONFIG_SERIAL_8250_CONSOLE
172	if (hp300_uart_scode == d->scode) {
173		/* Already got it. */
174		return 0;
175	}
176#endif
177	memset(&port, 0, sizeof(struct uart_port));
178
179	/* Memory mapped I/O */
180	port.iotype = UPIO_MEM;
181	port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
182	port.irq = d->ipl;
183	port.uartclk = HPDCA_BAUD_BASE * 16;
184	port.mapbase = (d->resource.start + UART_OFFSET);
185	port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
186	port.regshift = 1;
187	port.dev = &d->dev;
188	line = serial8250_register_port(&port);
189
190	if (line < 0) {
191		printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
192		       " irq %d failed\n", d->scode, port.irq);
193		return -ENOMEM;
194	}
195
196	/* Enable board-interrupts */
197	out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
198	dio_set_drvdata(d, (void *)line);
199
200	/* Reset the DCA */
201	out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
202	udelay(100);
203
204	num_ports++;
205
206	return 0;
207}
208#endif
209
210static int __init hp300_8250_init(void)
211{
212	static int called = 0;
213#ifdef CONFIG_HPAPCI
214	int line;
215	unsigned long base;
216	struct uart_port uport;
217	struct hp300_port *port;
218	int i;
219#endif
220	if (called)
221		return -ENODEV;
222	called = 1;
223
224	if (!MACH_IS_HP300)
225		return -ENODEV;
226
227#ifdef CONFIG_HPDCA
228	dio_register_driver(&hpdca_driver);
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		uport.irq = 0;
263		uport.uartclk = HPAPCI_BAUD_BASE * 16;
264		uport.mapbase = base;
265		uport.membase = (char *)(base + DIO_VIRADDRBASE);
266		uport.regshift = 2;
267
268		line = serial8250_register_port(&uport);
269
270		if (line < 0) {
271			printk(KERN_NOTICE "8250_hp300: register_serial() APCI %d"
272			       " irq %d failed\n", i, uport.irq);
273			kfree(port);
274			continue;
275		}
276
277		port->line = line;
278		port->next = hp300_ports;
279		hp300_ports = port;
280
281		num_ports++;
282	}
283#endif
284
285	/* Any boards found? */
286	if (!num_ports)
287		return -ENODEV;
288
289	return 0;
290}
291
292#ifdef CONFIG_HPDCA
293static void __devexit hpdca_remove_one(struct dio_dev *d)
294{
295	int line;
296
297	line = (int) dio_get_drvdata(d);
298	if (d->resource.start) {
299		/* Disable board-interrupts */
300		out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
301	}
302	serial8250_unregister_port(line);
303}
304#endif
305
306static void __exit hp300_8250_exit(void)
307{
308#ifdef CONFIG_HPAPCI
309	struct hp300_port *port, *to_free;
310
311	for (port = hp300_ports; port; ) {
312		serial8250_unregister_port(port->line);
313		to_free = port;
314		port = port->next;
315		kfree(to_free);
316	}
317
318	hp300_ports = NULL;
319#endif
320#ifdef CONFIG_HPDCA
321	dio_unregister_driver(&hpdca_driver);
322#endif
323}
324
325module_init(hp300_8250_init);
326module_exit(hp300_8250_exit);
327MODULE_DESCRIPTION("HP DCA/APCI serial driver");
328MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
329MODULE_LICENSE("GPL");
330