ia64/linux-2.6.18-xen.hg

view drivers/char/ec3104_keyb.c @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
1 /*
2 * linux/drivers/char/ec3104_keyb.c
3 *
4 * Copyright (C) 2000 Philipp Rumpf <prumpf@tux.org>
5 *
6 * based on linux/drivers/char/pc_keyb.c, which had the following comments:
7 *
8 * Separation of the PC low-level part by Geert Uytterhoeven, May 1997
9 * See keyboard.c for the whole history.
10 *
11 * Major cleanup by Martin Mares, May 1997
12 *
13 * Combined the keyboard and PS/2 mouse handling into one file,
14 * because they share the same hardware.
15 * Johan Myreen <jem@iki.fi> 1998-10-08.
16 *
17 * Code fixes to handle mouse ACKs properly.
18 * C. Scott Ananian <cananian@alumni.princeton.edu> 1999-01-29.
19 */
20 /* EC3104 note:
21 * This code was written without any documentation about the EC3104 chip. While
22 * I hope I got most of the basic functionality right, the register names I use
23 * are most likely completely different from those in the chip documentation.
24 *
25 * If you have any further information about the EC3104, please tell me
26 * (prumpf@tux.org).
27 */
30 #include <linux/spinlock.h>
31 #include <linux/sched.h>
32 #include <linux/interrupt.h>
33 #include <linux/tty.h>
34 #include <linux/mm.h>
35 #include <linux/signal.h>
36 #include <linux/init.h>
37 #include <linux/kbd_ll.h>
38 #include <linux/delay.h>
39 #include <linux/random.h>
40 #include <linux/poll.h>
41 #include <linux/miscdevice.h>
42 #include <linux/slab.h>
43 #include <linux/kbd_kern.h>
44 #include <linux/smp_lock.h>
45 #include <linux/bitops.h>
47 #include <asm/keyboard.h>
48 #include <asm/uaccess.h>
49 #include <asm/irq.h>
50 #include <asm/system.h>
51 #include <asm/ec3104.h>
53 #include <asm/io.h>
55 /* Some configuration switches are present in the include file... */
57 #include <linux/pc_keyb.h>
59 #define MSR_CTS 0x10
60 #define MCR_RTS 0x02
61 #define LSR_DR 0x01
62 #define LSR_BOTH_EMPTY 0x60
64 static struct e5_struct {
65 u8 packet[8];
66 int pos;
67 int length;
69 u8 cached_mcr;
70 u8 last_msr;
71 } ec3104_keyb;
73 /* Simple translation table for the SysRq keys */
76 #ifdef CONFIG_MAGIC_SYSRQ
77 unsigned char ec3104_kbd_sysrq_xlate[128] =
78 "\000\0331234567890-=\177\t" /* 0x00 - 0x0f */
79 "qwertyuiop[]\r\000as" /* 0x10 - 0x1f */
80 "dfghjkl;'`\000\\zxcv" /* 0x20 - 0x2f */
81 "bnm,./\000*\000 \000\201\202\203\204\205" /* 0x30 - 0x3f */
82 "\206\207\210\211\212\000\000789-456+1" /* 0x40 - 0x4f */
83 "230\177\000\000\213\214\000\000\000\000\000\000\000\000\000\000" /* 0x50 - 0x5f */
84 "\r\000/"; /* 0x60 - 0x6f */
85 #endif
87 static void kbd_write_command_w(int data);
88 static void kbd_write_output_w(int data);
89 #ifdef CONFIG_PSMOUSE
90 static void aux_write_ack(int val);
91 static void __aux_write_ack(int val);
92 #endif
94 static DEFINE_SPINLOCK(kbd_controller_lock);
95 static unsigned char handle_kbd_event(void);
97 /* used only by send_data - set by keyboard_interrupt */
98 static volatile unsigned char reply_expected;
99 static volatile unsigned char acknowledge;
100 static volatile unsigned char resend;
103 int ec3104_kbd_setkeycode(unsigned int scancode, unsigned int keycode)
104 {
105 return 0;
106 }
108 int ec3104_kbd_getkeycode(unsigned int scancode)
109 {
110 return 0;
111 }
114 /* yes, it probably would be faster to use an array. I don't care. */
116 static inline unsigned char ec3104_scan2key(unsigned char scancode)
117 {
118 switch (scancode) {
119 case 1: /* '`' */
120 return 41;
122 case 2 ... 27:
123 return scancode;
125 case 28: /* '\\' */
126 return 43;
128 case 29 ... 39:
129 return scancode + 1;
131 case 40: /* '\r' */
132 return 28;
134 case 41 ... 50:
135 return scancode + 3;
137 case 51: /* ' ' */
138 return 57;
140 case 52: /* escape */
141 return 1;
143 case 54: /* insert/delete (labelled delete) */
144 /* this should arguably be 110, but I'd like to have ctrl-alt-del
145 * working with a standard keymap */
146 return 111;
148 case 55: /* left */
149 return 105;
150 case 56: /* home */
151 return 102;
152 case 57: /* end */
153 return 107;
154 case 58: /* up */
155 return 103;
156 case 59: /* down */
157 return 108;
158 case 60: /* pgup */
159 return 104;
160 case 61: /* pgdown */
161 return 109;
162 case 62: /* right */
163 return 106;
165 case 79 ... 88: /* f1 - f10 */
166 return scancode - 20;
168 case 89 ... 90: /* f11 - f12 */
169 return scancode - 2;
171 case 91: /* left shift */
172 return 42;
174 case 92: /* right shift */
175 return 54;
177 case 93: /* left alt */
178 return 56;
179 case 94: /* right alt */
180 return 100;
181 case 95: /* left ctrl */
182 return 29;
183 case 96: /* right ctrl */
184 return 97;
186 case 97: /* caps lock */
187 return 58;
188 case 102: /* left windows */
189 return 125;
190 case 103: /* right windows */
191 return 126;
193 case 106: /* Fn */
194 /* this is wrong. */
195 return 84;
197 default:
198 return 0;
199 }
200 }
202 int ec3104_kbd_translate(unsigned char scancode, unsigned char *keycode,
203 char raw_mode)
204 {
205 scancode &= 0x7f;
207 *keycode = ec3104_scan2key(scancode);
209 return 1;
210 }
212 char ec3104_kbd_unexpected_up(unsigned char keycode)
213 {
214 return 0200;
215 }
217 static inline void handle_keyboard_event(unsigned char scancode)
218 {
219 #ifdef CONFIG_VT
220 handle_scancode(scancode, !(scancode & 0x80));
221 #endif
222 tasklet_schedule(&keyboard_tasklet);
223 }
225 void ec3104_kbd_leds(unsigned char leds)
226 {
227 }
229 static u8 e5_checksum(u8 *packet, int count)
230 {
231 int i;
232 u8 sum = 0;
234 for (i=0; i<count; i++)
235 sum ^= packet[i];
237 if (sum & 0x80)
238 sum ^= 0xc0;
240 return sum;
241 }
243 static void e5_wait_for_cts(struct e5_struct *k)
244 {
245 u8 msr;
247 do {
248 msr = ctrl_inb(EC3104_SER4_MSR);
249 } while (!(msr & MSR_CTS));
250 }
253 static void e5_send_byte(u8 byte, struct e5_struct *k)
254 {
255 u8 status;
257 do {
258 status = ctrl_inb(EC3104_SER4_LSR);
259 } while ((status & LSR_BOTH_EMPTY) != LSR_BOTH_EMPTY);
261 printk("<%02x>", byte);
263 ctrl_outb(byte, EC3104_SER4_DATA);
265 do {
266 status = ctrl_inb(EC3104_SER4_LSR);
267 } while ((status & LSR_BOTH_EMPTY) != LSR_BOTH_EMPTY);
269 }
271 static int e5_send_packet(u8 *packet, int count, struct e5_struct *k)
272 {
273 int i;
275 disable_irq(EC3104_IRQ_SER4);
277 if (k->cached_mcr & MCR_RTS) {
278 printk("e5_send_packet: too slow\n");
279 enable_irq(EC3104_IRQ_SER4);
280 return -EAGAIN;
281 }
283 k->cached_mcr |= MCR_RTS;
284 ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
286 e5_wait_for_cts(k);
288 printk("p: ");
290 for(i=0; i<count; i++)
291 e5_send_byte(packet[i], k);
293 e5_send_byte(e5_checksum(packet, count), k);
295 printk("\n");
297 udelay(1500);
299 k->cached_mcr &= ~MCR_RTS;
300 ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
302 set_current_state(TASK_UNINTERRUPTIBLE);
306 enable_irq(EC3104_IRQ_SER4);
310 return 0;
311 }
313 /*
314 * E5 packets we know about:
315 * E5->host 0x80 0x05 <checksum> - resend packet
316 * host->E5 0x83 0x43 <contrast> - set LCD contrast
317 * host->E5 0x85 0x41 0x02 <brightness> 0x02 - set LCD backlight
318 * E5->host 0x87 <ps2 packet> 0x00 <checksum> - external PS2
319 * E5->host 0x88 <scancode> <checksum> - key press
320 */
322 static void e5_receive(struct e5_struct *k)
323 {
324 k->packet[k->pos++] = ctrl_inb(EC3104_SER4_DATA);
326 if (k->pos == 1) {
327 switch(k->packet[0]) {
328 case 0x80:
329 k->length = 3;
330 break;
332 case 0x87: /* PS2 ext */
333 k->length = 6;
334 break;
336 case 0x88: /* keyboard */
337 k->length = 3;
338 break;
340 default:
341 k->length = 1;
342 printk(KERN_WARNING "unknown E5 packet %02x\n",
343 k->packet[0]);
344 }
345 }
347 if (k->pos == k->length) {
348 int i;
350 if (e5_checksum(k->packet, k->length) != 0)
351 printk(KERN_WARNING "E5: wrong checksum\n");
353 #if 0
354 printk("E5 packet [");
355 for(i=0; i<k->length; i++) {
356 printk("%02x ", k->packet[i]);
357 }
359 printk("(%02x)]\n", e5_checksum(k->packet, k->length-1));
360 #endif
362 switch(k->packet[0]) {
363 case 0x80:
364 case 0x88:
365 handle_keyboard_event(k->packet[1]);
366 break;
367 }
369 k->pos = k->length = 0;
370 }
371 }
373 static void ec3104_keyb_interrupt(int irq, void *data, struct pt_regs *regs)
374 {
375 struct e5_struct *k = &ec3104_keyb;
376 u8 msr, lsr;
378 msr = ctrl_inb(EC3104_SER4_MSR);
380 if ((msr & MSR_CTS) && !(k->last_msr & MSR_CTS)) {
381 if (k->cached_mcr & MCR_RTS)
382 printk("confused: RTS already high\n");
383 /* CTS went high. Send RTS. */
384 k->cached_mcr |= MCR_RTS;
386 ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
387 } else if ((!(msr & MSR_CTS)) && (k->last_msr & MSR_CTS)) {
388 /* CTS went low. */
389 if (!(k->cached_mcr & MCR_RTS))
390 printk("confused: RTS already low\n");
392 k->cached_mcr &= ~MCR_RTS;
394 ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
395 }
397 k->last_msr = msr;
399 lsr = ctrl_inb(EC3104_SER4_LSR);
401 if (lsr & LSR_DR)
402 e5_receive(k);
403 }
405 static void ec3104_keyb_clear_state(void)
406 {
407 struct e5_struct *k = &ec3104_keyb;
408 u8 msr, lsr;
410 /* we want CTS to be low */
411 k->last_msr = 0;
413 for (;;) {
414 msleep(100);
416 msr = ctrl_inb(EC3104_SER4_MSR);
418 lsr = ctrl_inb(EC3104_SER4_LSR);
420 if (lsr & LSR_DR) {
421 e5_receive(k);
422 continue;
423 }
425 if ((msr & MSR_CTS) && !(k->last_msr & MSR_CTS)) {
426 if (k->cached_mcr & MCR_RTS)
427 printk("confused: RTS already high\n");
428 /* CTS went high. Send RTS. */
429 k->cached_mcr |= MCR_RTS;
431 ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
432 } else if ((!(msr & MSR_CTS)) && (k->last_msr & MSR_CTS)) {
433 /* CTS went low. */
434 if (!(k->cached_mcr & MCR_RTS))
435 printk("confused: RTS already low\n");
437 k->cached_mcr &= ~MCR_RTS;
439 ctrl_outb(k->cached_mcr, EC3104_SER4_MCR);
440 } else
441 break;
443 k->last_msr = msr;
445 continue;
446 }
447 }
449 void __init ec3104_kbd_init_hw(void)
450 {
451 ec3104_keyb.last_msr = ctrl_inb(EC3104_SER4_MSR);
452 ec3104_keyb.cached_mcr = ctrl_inb(EC3104_SER4_MCR);
454 ec3104_keyb_clear_state();
456 /* Ok, finally allocate the IRQ, and off we go.. */
457 request_irq(EC3104_IRQ_SER4, ec3104_keyb_interrupt, 0, "keyboard", NULL);
458 }