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/serial_8250.h>
15 #include <linux/delay.h>
16 #include <linux/dio.h>
17 #include <linux/console.h>
18 #include <asm/io.h>
19
20 #include "8250.h"
21
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
59 static unsigned int num_ports;
60
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 } else {
130 #ifdef CONFIG_HPDCA
131 unsigned long pa = dio_scodetophysaddr(scode);
132 if (!pa)
133 return 0;
134
135 printk(KERN_INFO "Serial console is HP DCA at select code %d\n", scode);
136
137 port.uartclk = HPDCA_BAUD_BASE * 16;
138 port.mapbase = (pa + UART_OFFSET);
139 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
140 port.regshift = 1;
141 port.irq = DIO_IPL(pa + DIO_VIRADDRBASE);
142
143 /* Enable board-interrupts */
144 out_8(pa + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
145
146 if (DIO_ID(pa + DIO_VIRADDRBASE) & 0x80)
147 add_preferred_console("ttyS", port.line, "9600n8");
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 return 0;
157 }
158 #endif /* CONFIG_SERIAL_8250_CONSOLE */
159
160 #ifdef CONFIG_HPDCA
161 static int __devinit hpdca_init_one(struct dio_dev *d,
162 const struct dio_device_id *ent)
163 {
164 struct uart_port port;
165 int line;
166
167 #ifdef CONFIG_SERIAL_8250_CONSOLE
168 if (hp300_uart_scode == d->scode) {
169 /* Already got it. */
170 return 0;
171 }
172 #endif
173 memset(&port, 0, sizeof(struct uart_port));
174
175 /* Memory mapped I/O */
176 port.iotype = UPIO_MEM;
177 port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
178 port.irq = d->ipl;
179 port.uartclk = HPDCA_BAUD_BASE * 16;
180 port.mapbase = (d->resource.start + UART_OFFSET);
181 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
182 port.regshift = 1;
183 port.dev = &d->dev;
184 line = serial8250_register_port(&port);
185
186 if (line < 0) {
187 printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
188 " irq %d failed\n", d->scode, port.irq);
189 return -ENOMEM;
190 }
191
192 /* Enable board-interrupts */
193 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
194 dio_set_drvdata(d, (void *)line);
195
196 /* Reset the DCA */
197 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
198 udelay(100);
199
200 num_ports++;
201
202 return 0;
203 }
204 #endif
205
206 static int __init hp300_8250_init(void)
207 {
208 static int called;
209 #ifdef CONFIG_HPAPCI
210 int line;
211 unsigned long base;
212 struct uart_port uport;
213 struct hp300_port *port;
214 int i;
215 #endif
216 if (called)
217 return -ENODEV;
218 called = 1;
219
220 if (!MACH_IS_HP300)
221 return -ENODEV;
222
223 #ifdef CONFIG_HPDCA
224 dio_register_driver(&hpdca_driver);
225 #endif
226 #ifdef CONFIG_HPAPCI
227 if (hp300_model < HP_400) {
228 if (!num_ports)
229 return -ENODEV;
230 return 0;
231 }
232 /* These models have the Frodo chip.
233 * Port 0 is reserved for the Apollo Domain keyboard.
234 * Port 1 is either the console or the DCA.
235 */
236 for (i = 1; i < 4; i++) {
237 /* Port 1 is the console on a 425e, on other machines it's
238 * mapped to DCA.
239 */
240 #ifdef CONFIG_SERIAL_8250_CONSOLE
241 if (i == 1)
242 continue;
243 #endif
244
245 /* Create new serial device */
246 port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL);
247 if (!port)
248 return -ENOMEM;
249
250 memset(&uport, 0, sizeof(struct uart_port));
251
252 base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
253
254 /* Memory mapped I/O */
255 uport.iotype = UPIO_MEM;
256 uport.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ \
257 | UPF_BOOT_AUTOCONF;
258 /* XXX - no interrupt support yet */
259 uport.irq = 0;
260 uport.uartclk = HPAPCI_BAUD_BASE * 16;
261 uport.mapbase = base;
262 uport.membase = (char *)(base + DIO_VIRADDRBASE);
263 uport.regshift = 2;
264
265 line = serial8250_register_port(&uport);
266
267 if (line < 0) {
268 printk(KERN_NOTICE "8250_hp300: register_serial() APCI"
269 " %d irq %d failed\n", i, uport.irq);
270 kfree(port);
271 continue;
272 }
273
274 port->line = line;
275 port->next = hp300_ports;
276 hp300_ports = port;
277
278 num_ports++;
279 }
280 #endif
281
282 /* Any boards found? */
283 if (!num_ports)
284 return -ENODEV;
285
286 return 0;
287 }
288
289 #ifdef CONFIG_HPDCA
290 static void __devexit hpdca_remove_one(struct dio_dev *d)
291 {
292 int line;
293
294 line = (int) dio_get_drvdata(d);
295 if (d->resource.start) {
296 /* Disable board-interrupts */
297 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
298 }
299 serial8250_unregister_port(line);
300 }
301 #endif
302
303 static void __exit hp300_8250_exit(void)
304 {
305 #ifdef CONFIG_HPAPCI
306 struct hp300_port *port, *to_free;
307
308 for (port = hp300_ports; port; ) {
309 serial8250_unregister_port(port->line);
310 to_free = port;
311 port = port->next;
312 kfree(to_free);
313 }
314
315 hp300_ports = NULL;
316 #endif
317 #ifdef CONFIG_HPDCA
318 dio_unregister_driver(&hpdca_driver);
319 #endif
320 }
321
322 module_init(hp300_8250_init);
323 module_exit(hp300_8250_exit);
324 MODULE_DESCRIPTION("HP DCA/APCI serial driver");
325 MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
326 MODULE_LICENSE("GPL");
327
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