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 <linux/slab.h>
19 #include <asm/io.h>
20
21 #include "8250.h"
22
23 #if !defined(CONFIG_HPDCA) && !defined(CONFIG_HPAPCI)
24 #warning CONFIG_8250 defined but neither CONFIG_HPDCA nor CONFIG_HPAPCI defined, are you sure?
25 #endif
26
27 #ifdef CONFIG_HPAPCI
28 struct hp300_port
29 {
30 struct hp300_port *next; /* next port */
31 int line; /* line (tty) number */
32 };
33
34 static struct hp300_port *hp300_ports;
35 #endif
36
37 #ifdef CONFIG_HPDCA
38
39 static int __devinit hpdca_init_one(struct dio_dev *d,
40 const struct dio_device_id *ent);
41 static void __devexit hpdca_remove_one(struct dio_dev *d);
42
43 static struct dio_device_id hpdca_dio_tbl[] = {
44 { DIO_ID_DCA0 },
45 { DIO_ID_DCA0REM },
46 { DIO_ID_DCA1 },
47 { DIO_ID_DCA1REM },
48 { 0 }
49 };
50
51 static struct dio_driver hpdca_driver = {
52 .name = "hpdca",
53 .id_table = hpdca_dio_tbl,
54 .probe = hpdca_init_one,
55 .remove = __devexit_p(hpdca_remove_one),
56 };
57
58 #endif
59
60 static unsigned int num_ports;
61
62 extern int hp300_uart_scode;
63
64 /* Offset to UART registers from base of DCA */
65 #define UART_OFFSET 17
66
67 #define DCA_ID 0x01 /* ID (read), reset (write) */
68 #define DCA_IC 0x03 /* Interrupt control */
69
70 /* Interrupt control */
71 #define DCA_IC_IE 0x80 /* Master interrupt enable */
72
73 #define HPDCA_BAUD_BASE 153600
74
75 /* Base address of the Frodo part */
76 #define FRODO_BASE (0x41c000)
77
78 /*
79 * Where we find the 8250-like APCI ports, and how far apart they are.
80 */
81 #define FRODO_APCIBASE 0x0
82 #define FRODO_APCISPACE 0x20
83 #define FRODO_APCI_OFFSET(x) (FRODO_APCIBASE + ((x) * FRODO_APCISPACE))
84
85 #define HPAPCI_BAUD_BASE 500400
86
87 #ifdef CONFIG_SERIAL_8250_CONSOLE
88 /*
89 * Parse the bootinfo to find descriptions for headless console and
90 * debug serial ports and register them with the 8250 driver.
91 * This function should be called before serial_console_init() is called
92 * to make sure the serial console will be available for use. IA-64 kernel
93 * calls this function from setup_arch() after the EFI and ACPI tables have
94 * been parsed.
95 */
hp300_setup_serial_console(void)96 int __init hp300_setup_serial_console(void)
97 {
98 int scode;
99 struct uart_port port;
100
101 memset(&port, 0, sizeof(port));
102
103 if (hp300_uart_scode < 0 || hp300_uart_scode > DIO_SCMAX)
104 return 0;
105
106 if (DIO_SCINHOLE(hp300_uart_scode))
107 return 0;
108
109 scode = hp300_uart_scode;
110
111 /* Memory mapped I/O */
112 port.iotype = UPIO_MEM;
113 port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
114 port.type = PORT_UNKNOWN;
115
116 /* Check for APCI console */
117 if (scode == 256) {
118 #ifdef CONFIG_HPAPCI
119 printk(KERN_INFO "Serial console is HP APCI 1\n");
120
121 port.uartclk = HPAPCI_BAUD_BASE * 16;
122 port.mapbase = (FRODO_BASE + FRODO_APCI_OFFSET(1));
123 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
124 port.regshift = 2;
125 add_preferred_console("ttyS", port.line, "9600n8");
126 #else
127 printk(KERN_WARNING "Serial console is APCI but support is disabled (CONFIG_HPAPCI)!\n");
128 return 0;
129 #endif
130 } else {
131 #ifdef CONFIG_HPDCA
132 unsigned long pa = dio_scodetophysaddr(scode);
133 if (!pa)
134 return 0;
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 #else
150 printk(KERN_WARNING "Serial console is DCA but support is disabled (CONFIG_HPDCA)!\n");
151 return 0;
152 #endif
153 }
154
155 if (early_serial_setup(&port) < 0)
156 printk(KERN_WARNING "hp300_setup_serial_console(): early_serial_setup() failed.\n");
157 return 0;
158 }
159 #endif /* CONFIG_SERIAL_8250_CONSOLE */
160
161 #ifdef CONFIG_HPDCA
hpdca_init_one(struct dio_dev * d,const struct dio_device_id * ent)162 static int __devinit hpdca_init_one(struct dio_dev *d,
163 const struct dio_device_id *ent)
164 {
165 struct uart_port port;
166 int line;
167
168 #ifdef CONFIG_SERIAL_8250_CONSOLE
169 if (hp300_uart_scode == d->scode) {
170 /* Already got it. */
171 return 0;
172 }
173 #endif
174 memset(&port, 0, sizeof(struct uart_port));
175
176 /* Memory mapped I/O */
177 port.iotype = UPIO_MEM;
178 port.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ | UPF_BOOT_AUTOCONF;
179 port.irq = d->ipl;
180 port.uartclk = HPDCA_BAUD_BASE * 16;
181 port.mapbase = (d->resource.start + UART_OFFSET);
182 port.membase = (char *)(port.mapbase + DIO_VIRADDRBASE);
183 port.regshift = 1;
184 port.dev = &d->dev;
185 line = serial8250_register_port(&port);
186
187 if (line < 0) {
188 printk(KERN_NOTICE "8250_hp300: register_serial() DCA scode %d"
189 " irq %d failed\n", d->scode, port.irq);
190 return -ENOMEM;
191 }
192
193 /* Enable board-interrupts */
194 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, DCA_IC_IE);
195 dio_set_drvdata(d, (void *)line);
196
197 /* Reset the DCA */
198 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_ID, 0xff);
199 udelay(100);
200
201 num_ports++;
202
203 return 0;
204 }
205 #endif
206
hp300_8250_init(void)207 static int __init hp300_8250_init(void)
208 {
209 static int called;
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 #ifdef CONFIG_HPDCA
225 dio_register_driver(&hpdca_driver);
226 #endif
227 #ifdef CONFIG_HPAPCI
228 if (hp300_model < HP_400) {
229 if (!num_ports)
230 return -ENODEV;
231 return 0;
232 }
233 /* These models have the Frodo chip.
234 * Port 0 is reserved for the Apollo Domain keyboard.
235 * Port 1 is either the console or the DCA.
236 */
237 for (i = 1; i < 4; i++) {
238 /* Port 1 is the console on a 425e, on other machines it's
239 * mapped to DCA.
240 */
241 #ifdef CONFIG_SERIAL_8250_CONSOLE
242 if (i == 1)
243 continue;
244 #endif
245
246 /* Create new serial device */
247 port = kmalloc(sizeof(struct hp300_port), GFP_KERNEL);
248 if (!port)
249 return -ENOMEM;
250
251 memset(&uport, 0, sizeof(struct uart_port));
252
253 base = (FRODO_BASE + FRODO_APCI_OFFSET(i));
254
255 /* Memory mapped I/O */
256 uport.iotype = UPIO_MEM;
257 uport.flags = UPF_SKIP_TEST | UPF_SHARE_IRQ \
258 | UPF_BOOT_AUTOCONF;
259 /* XXX - no interrupt support yet */
260 uport.irq = 0;
261 uport.uartclk = HPAPCI_BAUD_BASE * 16;
262 uport.mapbase = base;
263 uport.membase = (char *)(base + DIO_VIRADDRBASE);
264 uport.regshift = 2;
265
266 line = serial8250_register_port(&uport);
267
268 if (line < 0) {
269 printk(KERN_NOTICE "8250_hp300: register_serial() APCI"
270 " %d irq %d failed\n", i, uport.irq);
271 kfree(port);
272 continue;
273 }
274
275 port->line = line;
276 port->next = hp300_ports;
277 hp300_ports = port;
278
279 num_ports++;
280 }
281 #endif
282
283 /* Any boards found? */
284 if (!num_ports)
285 return -ENODEV;
286
287 return 0;
288 }
289
290 #ifdef CONFIG_HPDCA
hpdca_remove_one(struct dio_dev * d)291 static void __devexit hpdca_remove_one(struct dio_dev *d)
292 {
293 int line;
294
295 line = (int) dio_get_drvdata(d);
296 if (d->resource.start) {
297 /* Disable board-interrupts */
298 out_8(d->resource.start + DIO_VIRADDRBASE + DCA_IC, 0);
299 }
300 serial8250_unregister_port(line);
301 }
302 #endif
303
hp300_8250_exit(void)304 static void __exit hp300_8250_exit(void)
305 {
306 #ifdef CONFIG_HPAPCI
307 struct hp300_port *port, *to_free;
308
309 for (port = hp300_ports; port; ) {
310 serial8250_unregister_port(port->line);
311 to_free = port;
312 port = port->next;
313 kfree(to_free);
314 }
315
316 hp300_ports = NULL;
317 #endif
318 #ifdef CONFIG_HPDCA
319 dio_unregister_driver(&hpdca_driver);
320 #endif
321 }
322
323 module_init(hp300_8250_init);
324 module_exit(hp300_8250_exit);
325 MODULE_DESCRIPTION("HP DCA/APCI serial driver");
326 MODULE_AUTHOR("Kars de Jong <jongk@linux-m68k.org>");
327 MODULE_LICENSE("GPL");
328