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Jaya Kumaraad09e52007-05-08 00:37:43 -07001/*
2 * linux/drivers/video/hecubafb.c -- FB driver for Hecuba controller
3 *
4 * Copyright (C) 2006, Jaya Kumar
5 * This work was sponsored by CIS(M) Sdn Bhd
6 *
7 * This file is subject to the terms and conditions of the GNU General Public
8 * License. See the file COPYING in the main directory of this archive for
9 * more details.
10 *
11 * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
12 * This work was possible because of apollo display code from E-Ink's website
13 * http://support.eink.com/community
14 * All information used to write this code is from public material made
15 * available by E-Ink on its support site. Some commands such as 0xA4
16 * were found by looping through cmd=0x00 thru 0xFF and supplying random
17 * values. There are other commands that the display is capable of,
18 * beyond the 5 used here but they are more complex.
19 *
20 * This driver is written to be used with the Hecuba display controller
21 * board, and tested with the EInk 800x600 display in 1 bit mode.
22 * The interface between Hecuba and the host is TTL based GPIO. The
23 * GPIO requirements are 8 writable data lines and 6 lines for control.
24 * Only 4 of the controls are actually used here but 6 for future use.
25 * The driver requires the IO addresses for data and control GPIO at
26 * load time. It is also possible to use this display with a standard
27 * PC parallel port.
28 *
29 * General notes:
30 * - User must set hecubafb_enable=1 to enable it
31 * - User must set dio_addr=0xIOADDR cio_addr=0xIOADDR c2io_addr=0xIOADDR
32 *
33 */
34
35#include <linux/module.h>
36#include <linux/kernel.h>
37#include <linux/errno.h>
38#include <linux/string.h>
39#include <linux/mm.h>
40#include <linux/slab.h>
41#include <linux/vmalloc.h>
42#include <linux/delay.h>
43#include <linux/interrupt.h>
44#include <linux/fb.h>
45#include <linux/init.h>
46#include <linux/platform_device.h>
47#include <linux/list.h>
48#include <asm/uaccess.h>
49
50/* Apollo controller specific defines */
51#define APOLLO_START_NEW_IMG 0xA0
52#define APOLLO_STOP_IMG_DATA 0xA1
53#define APOLLO_DISPLAY_IMG 0xA2
54#define APOLLO_ERASE_DISPLAY 0xA3
55#define APOLLO_INIT_DISPLAY 0xA4
56
57/* Hecuba interface specific defines */
58/* WUP is inverted, CD is inverted, DS is inverted */
59#define HCB_NWUP_BIT 0x01
60#define HCB_NDS_BIT 0x02
61#define HCB_RW_BIT 0x04
62#define HCB_NCD_BIT 0x08
63#define HCB_ACK_BIT 0x80
64
65/* Display specific information */
66#define DPY_W 600
67#define DPY_H 800
68
69struct hecubafb_par {
70 unsigned long dio_addr;
71 unsigned long cio_addr;
72 unsigned long c2io_addr;
73 unsigned char ctl;
74 struct fb_info *info;
75 unsigned int irq;
76};
77
78static struct fb_fix_screeninfo hecubafb_fix __devinitdata = {
79 .id = "hecubafb",
80 .type = FB_TYPE_PACKED_PIXELS,
81 .visual = FB_VISUAL_MONO01,
82 .xpanstep = 0,
83 .ypanstep = 0,
84 .ywrapstep = 0,
85 .accel = FB_ACCEL_NONE,
86};
87
88static struct fb_var_screeninfo hecubafb_var __devinitdata = {
89 .xres = DPY_W,
90 .yres = DPY_H,
91 .xres_virtual = DPY_W,
92 .yres_virtual = DPY_H,
93 .bits_per_pixel = 1,
94 .nonstd = 1,
95};
96
97static unsigned long dio_addr;
98static unsigned long cio_addr;
99static unsigned long c2io_addr;
100static unsigned long splashval;
101static unsigned int nosplash;
102static unsigned int hecubafb_enable;
103static unsigned int irq;
104
105static DECLARE_WAIT_QUEUE_HEAD(hecubafb_waitq);
106
107static void hcb_set_ctl(struct hecubafb_par *par)
108{
109 outb(par->ctl, par->cio_addr);
110}
111
112static unsigned char hcb_get_ctl(struct hecubafb_par *par)
113{
114 return inb(par->c2io_addr);
115}
116
117static void hcb_set_data(struct hecubafb_par *par, unsigned char value)
118{
119 outb(value, par->dio_addr);
120}
121
122static int __devinit apollo_init_control(struct hecubafb_par *par)
123{
124 unsigned char ctl;
125 /* for init, we want the following setup to be set:
126 WUP = lo
127 ACK = hi
128 DS = hi
129 RW = hi
130 CD = lo
131 */
132
133 /* write WUP to lo, DS to hi, RW to hi, CD to lo */
134 par->ctl = HCB_NWUP_BIT | HCB_RW_BIT | HCB_NCD_BIT ;
135 par->ctl &= ~HCB_NDS_BIT;
136 hcb_set_ctl(par);
137
138 /* check ACK is not lo */
139 ctl = hcb_get_ctl(par);
140 if ((ctl & HCB_ACK_BIT)) {
141 printk(KERN_ERR "Fail because ACK is already low\n");
142 return -ENXIO;
143 }
144
145 return 0;
146}
147
Adrian Bunk9a268a62007-05-08 00:37:45 -0700148static void hcb_wait_for_ack(struct hecubafb_par *par)
Jaya Kumaraad09e52007-05-08 00:37:43 -0700149{
150
151 int timeout;
152 unsigned char ctl;
153
154 timeout=500;
155 do {
156 ctl = hcb_get_ctl(par);
157 if ((ctl & HCB_ACK_BIT))
158 return;
159 udelay(1);
160 } while (timeout--);
161 printk(KERN_ERR "timed out waiting for ack\n");
162}
163
Adrian Bunk9a268a62007-05-08 00:37:45 -0700164static void hcb_wait_for_ack_clear(struct hecubafb_par *par)
Jaya Kumaraad09e52007-05-08 00:37:43 -0700165{
166
167 int timeout;
168 unsigned char ctl;
169
170 timeout=500;
171 do {
172 ctl = hcb_get_ctl(par);
173 if (!(ctl & HCB_ACK_BIT))
174 return;
175 udelay(1);
176 } while (timeout--);
177 printk(KERN_ERR "timed out waiting for clear\n");
178}
179
Adrian Bunk9a268a62007-05-08 00:37:45 -0700180static void apollo_send_data(struct hecubafb_par *par, unsigned char data)
Jaya Kumaraad09e52007-05-08 00:37:43 -0700181{
182 /* set data */
183 hcb_set_data(par, data);
184
185 /* set DS low */
186 par->ctl |= HCB_NDS_BIT;
187 hcb_set_ctl(par);
188
189 hcb_wait_for_ack(par);
190
191 /* set DS hi */
192 par->ctl &= ~(HCB_NDS_BIT);
193 hcb_set_ctl(par);
194
195 hcb_wait_for_ack_clear(par);
196}
197
Adrian Bunk9a268a62007-05-08 00:37:45 -0700198static void apollo_send_command(struct hecubafb_par *par, unsigned char data)
Jaya Kumaraad09e52007-05-08 00:37:43 -0700199{
200 /* command so set CD to high */
201 par->ctl &= ~(HCB_NCD_BIT);
202 hcb_set_ctl(par);
203
204 /* actually strobe with command */
205 apollo_send_data(par, data);
206
207 /* clear CD back to low */
208 par->ctl |= (HCB_NCD_BIT);
209 hcb_set_ctl(par);
210}
211
212/* main hecubafb functions */
213
214static void hecubafb_dpy_update(struct hecubafb_par *par)
215{
216 int i;
Antonino A. Daplas28cdf762007-05-08 00:38:50 -0700217 unsigned char *buf = (unsigned char __force *)par->info->screen_base;
Jaya Kumaraad09e52007-05-08 00:37:43 -0700218
219 apollo_send_command(par, 0xA0);
220
221 for (i=0; i < (DPY_W*DPY_H/8); i++) {
222 apollo_send_data(par, *(buf++));
223 }
224
225 apollo_send_command(par, 0xA1);
226 apollo_send_command(par, 0xA2);
227}
228
229/* this is called back from the deferred io workqueue */
230static void hecubafb_dpy_deferred_io(struct fb_info *info,
231 struct list_head *pagelist)
232{
233 hecubafb_dpy_update(info->par);
234}
235
236static void hecubafb_fillrect(struct fb_info *info,
237 const struct fb_fillrect *rect)
238{
239 struct hecubafb_par *par = info->par;
240
Antonino A. Daplasd6774932007-05-08 00:39:00 -0700241 sys_fillrect(info, rect);
Jaya Kumaraad09e52007-05-08 00:37:43 -0700242
243 hecubafb_dpy_update(par);
244}
245
246static void hecubafb_copyarea(struct fb_info *info,
247 const struct fb_copyarea *area)
248{
249 struct hecubafb_par *par = info->par;
250
Antonino A. Daplasd6774932007-05-08 00:39:00 -0700251 sys_copyarea(info, area);
Jaya Kumaraad09e52007-05-08 00:37:43 -0700252
253 hecubafb_dpy_update(par);
254}
255
256static void hecubafb_imageblit(struct fb_info *info,
257 const struct fb_image *image)
258{
259 struct hecubafb_par *par = info->par;
260
Antonino A. Daplasd6774932007-05-08 00:39:00 -0700261 sys_imageblit(info, image);
Jaya Kumaraad09e52007-05-08 00:37:43 -0700262
263 hecubafb_dpy_update(par);
264}
265
266/*
267 * this is the slow path from userspace. they can seek and write to
268 * the fb. it's inefficient to do anything less than a full screen draw
269 */
Antonino A. Daplas3f9b0882007-05-08 00:39:02 -0700270static ssize_t hecubafb_write(struct fb_info *info, const char __user *buf,
Jaya Kumaraad09e52007-05-08 00:37:43 -0700271 size_t count, loff_t *ppos)
272{
Jaya Kumaraad09e52007-05-08 00:37:43 -0700273 unsigned long p;
274 int err=-EINVAL;
275 struct hecubafb_par *par;
276 unsigned int xres;
277 unsigned int fbmemlength;
278
279 p = *ppos;
Jaya Kumaraad09e52007-05-08 00:37:43 -0700280 par = info->par;
281 xres = info->var.xres;
282 fbmemlength = (xres * info->var.yres)/8;
283
284 if (p > fbmemlength)
285 return -ENOSPC;
286
287 err = 0;
288 if ((count + p) > fbmemlength) {
289 count = fbmemlength - p;
290 err = -ENOSPC;
291 }
292
293 if (count) {
294 char *base_addr;
295
Antonino A. Daplas28cdf762007-05-08 00:38:50 -0700296 base_addr = (char __force *)info->screen_base;
Jaya Kumaraad09e52007-05-08 00:37:43 -0700297 count -= copy_from_user(base_addr + p, buf, count);
298 *ppos += count;
299 err = -EFAULT;
300 }
301
302 hecubafb_dpy_update(par);
303
304 if (count)
305 return count;
306
307 return err;
308}
309
310static struct fb_ops hecubafb_ops = {
311 .owner = THIS_MODULE,
Antonino A. Daplas28d45642007-05-08 00:39:06 -0700312 .fb_read = fb_sys_read,
Jaya Kumaraad09e52007-05-08 00:37:43 -0700313 .fb_write = hecubafb_write,
314 .fb_fillrect = hecubafb_fillrect,
315 .fb_copyarea = hecubafb_copyarea,
316 .fb_imageblit = hecubafb_imageblit,
317};
318
319static struct fb_deferred_io hecubafb_defio = {
320 .delay = HZ,
321 .deferred_io = hecubafb_dpy_deferred_io,
322};
323
324static int __devinit hecubafb_probe(struct platform_device *dev)
325{
326 struct fb_info *info;
327 int retval = -ENOMEM;
328 int videomemorysize;
329 unsigned char *videomemory;
330 struct hecubafb_par *par;
331
332 videomemorysize = (DPY_W*DPY_H)/8;
333
334 if (!(videomemory = vmalloc(videomemorysize)))
335 return retval;
336
337 memset(videomemory, 0, videomemorysize);
338
339 info = framebuffer_alloc(sizeof(struct hecubafb_par), &dev->dev);
340 if (!info)
341 goto err;
342
343 info->screen_base = (char __iomem *) videomemory;
344 info->fbops = &hecubafb_ops;
345
346 info->var = hecubafb_var;
347 info->fix = hecubafb_fix;
348 info->fix.smem_len = videomemorysize;
349 par = info->par;
350 par->info = info;
351
352 if (!dio_addr || !cio_addr || !c2io_addr) {
353 printk(KERN_WARNING "no IO addresses supplied\n");
354 goto err1;
355 }
356 par->dio_addr = dio_addr;
357 par->cio_addr = cio_addr;
358 par->c2io_addr = c2io_addr;
359 info->flags = FBINFO_FLAG_DEFAULT;
360
361 info->fbdefio = &hecubafb_defio;
362 fb_deferred_io_init(info);
363
364 retval = register_framebuffer(info);
365 if (retval < 0)
366 goto err1;
367 platform_set_drvdata(dev, info);
368
369 printk(KERN_INFO
370 "fb%d: Hecuba frame buffer device, using %dK of video memory\n",
371 info->node, videomemorysize >> 10);
372
373 /* this inits the dpy */
374 apollo_init_control(par);
375
376 apollo_send_command(par, APOLLO_INIT_DISPLAY);
377 apollo_send_data(par, 0x81);
378
379 /* have to wait while display resets */
380 udelay(1000);
381
382 /* if we were told to splash the screen, we just clear it */
383 if (!nosplash) {
384 apollo_send_command(par, APOLLO_ERASE_DISPLAY);
385 apollo_send_data(par, splashval);
386 }
387
388 return 0;
389err1:
390 framebuffer_release(info);
391err:
392 vfree(videomemory);
393 return retval;
394}
395
396static int __devexit hecubafb_remove(struct platform_device *dev)
397{
398 struct fb_info *info = platform_get_drvdata(dev);
399
400 if (info) {
401 fb_deferred_io_cleanup(info);
402 unregister_framebuffer(info);
Antonino A. Daplas28cdf762007-05-08 00:38:50 -0700403 vfree((void __force *)info->screen_base);
Jaya Kumaraad09e52007-05-08 00:37:43 -0700404 framebuffer_release(info);
405 }
406 return 0;
407}
408
409static struct platform_driver hecubafb_driver = {
410 .probe = hecubafb_probe,
411 .remove = hecubafb_remove,
412 .driver = {
413 .name = "hecubafb",
414 },
415};
416
417static struct platform_device *hecubafb_device;
418
419static int __init hecubafb_init(void)
420{
421 int ret;
422
423 if (!hecubafb_enable) {
424 printk(KERN_ERR "Use hecubafb_enable to enable the device\n");
425 return -ENXIO;
426 }
427
428 ret = platform_driver_register(&hecubafb_driver);
429 if (!ret) {
430 hecubafb_device = platform_device_alloc("hecubafb", 0);
431 if (hecubafb_device)
432 ret = platform_device_add(hecubafb_device);
433 else
434 ret = -ENOMEM;
435
436 if (ret) {
437 platform_device_put(hecubafb_device);
438 platform_driver_unregister(&hecubafb_driver);
439 }
440 }
441 return ret;
442
443}
444
445static void __exit hecubafb_exit(void)
446{
447 platform_device_unregister(hecubafb_device);
448 platform_driver_unregister(&hecubafb_driver);
449}
450
451module_param(nosplash, uint, 0);
452MODULE_PARM_DESC(nosplash, "Disable doing the splash screen");
453module_param(hecubafb_enable, uint, 0);
454MODULE_PARM_DESC(hecubafb_enable, "Enable communication with Hecuba board");
455module_param(dio_addr, ulong, 0);
456MODULE_PARM_DESC(dio_addr, "IO address for data, eg: 0x480");
457module_param(cio_addr, ulong, 0);
458MODULE_PARM_DESC(cio_addr, "IO address for control, eg: 0x400");
459module_param(c2io_addr, ulong, 0);
460MODULE_PARM_DESC(c2io_addr, "IO address for secondary control, eg: 0x408");
461module_param(splashval, ulong, 0);
462MODULE_PARM_DESC(splashval, "Splash pattern: 0x00 is black, 0x01 is white");
463module_param(irq, uint, 0);
464MODULE_PARM_DESC(irq, "IRQ for the Hecuba board");
465
466module_init(hecubafb_init);
467module_exit(hecubafb_exit);
468
469MODULE_DESCRIPTION("fbdev driver for Hecuba board");
470MODULE_AUTHOR("Jaya Kumar");
471MODULE_LICENSE("GPL");