2 * smscufx.c -- Framebuffer driver for SMSC UFX USB controller
4 * Copyright (C) 2011 Steve Glendinning <steve.glendinning@smsc.com>
5 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
6 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
7 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
9 * This file is subject to the terms and conditions of the GNU General Public
10 * License v2. See the file COPYING in the main directory of this archive for
13 * Based on udlfb, with work from Florian Echtler, Henrik Bjerregaard Pedersen,
16 * Works well with Bernie Thompson's X DAMAGE patch to xf86-video-fbdev
17 * available from http://git.plugable.com
19 * Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven,
20 * usb-skeleton by GregKH.
23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
25 #include <linux/module.h>
26 #include <linux/kernel.h>
27 #include <linux/init.h>
28 #include <linux/usb.h>
29 #include <linux/uaccess.h>
32 #include <linux/vmalloc.h>
33 #include <linux/slab.h>
34 #include <linux/delay.h>
37 #define check_warn(status, fmt, args...) \
38 ({ if (status < 0) pr_warn(fmt, ##args); })
40 #define check_warn_return(status, fmt, args...) \
41 ({ if (status < 0) { pr_warn(fmt, ##args); return status; } })
43 #define check_warn_goto_error(status, fmt, args...) \
44 ({ if (status < 0) { pr_warn(fmt, ##args); goto error; } })
46 #define all_bits_set(x, bits) (((x) & (bits)) == (bits))
48 #define USB_VENDOR_REQUEST_WRITE_REGISTER 0xA0
49 #define USB_VENDOR_REQUEST_READ_REGISTER 0xA1
52 * TODO: Propose standard fb.h ioctl for reporting damage,
53 * using _IOWR() and one of the existing area structs from fb.h
54 * Consider these ioctls deprecated, but they're still used by the
55 * DisplayLink X server as yet - need both to be modified in tandem
56 * when new ioctl(s) are ready.
58 #define UFX_IOCTL_RETURN_EDID (0xAD)
59 #define UFX_IOCTL_REPORT_DAMAGE (0xAA)
61 /* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
62 #define BULK_SIZE (512)
63 #define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
64 #define WRITES_IN_FLIGHT (4)
66 #define GET_URB_TIMEOUT (HZ)
67 #define FREE_URB_TIMEOUT (HZ*2)
71 #define UFX_DEFIO_WRITE_DELAY 5 /* fb_deferred_io.delay in jiffies */
72 #define UFX_DEFIO_WRITE_DISABLE (HZ*60) /* "disable" with long delay */
80 struct list_head entry;
82 struct delayed_work release_urb_work;
87 struct list_head list;
89 struct semaphore limit_sem;
96 struct usb_device *udev;
97 struct device *gdev; /* &udev->dev */
102 bool virtualized; /* true when physical usb device not present */
103 struct delayed_work free_framebuffer_work;
104 atomic_t usb_active; /* 0 = update virtual buffer, but no usb traffic */
105 atomic_t lost_pixels; /* 1 = a render op failed. Need screen refresh */
106 u8 *edid; /* null until we read edid from hw or get from sysfs */
108 u32 pseudo_palette[256];
111 static struct fb_fix_screeninfo ufx_fix = {
113 .type = FB_TYPE_PACKED_PIXELS,
114 .visual = FB_VISUAL_TRUECOLOR,
118 .accel = FB_ACCEL_NONE,
121 static const u32 smscufx_info_flags = FBINFO_DEFAULT | FBINFO_READS_FAST |
122 FBINFO_VIRTFB | FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT |
123 FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR;
125 static struct usb_device_id id_table[] = {
126 {USB_DEVICE(0x0424, 0x9d00),},
127 {USB_DEVICE(0x0424, 0x9d01),},
130 MODULE_DEVICE_TABLE(usb, id_table);
133 static bool console; /* Optionally allow fbcon to consume first framebuffer */
134 static bool fb_defio = true; /* Optionally enable fb_defio mmap support */
136 /* ufx keeps a list of urbs for efficient bulk transfers */
137 static void ufx_urb_completion(struct urb *urb);
138 static struct urb *ufx_get_urb(struct ufx_data *dev);
139 static int ufx_submit_urb(struct ufx_data *dev, struct urb * urb, size_t len);
140 static int ufx_alloc_urb_list(struct ufx_data *dev, int count, size_t size);
141 static void ufx_free_urb_list(struct ufx_data *dev);
143 /* reads a control register */
144 static int ufx_reg_read(struct ufx_data *dev, u32 index, u32 *data)
146 u32 *buf = kmalloc(4, GFP_KERNEL);
154 ret = usb_control_msg(dev->udev, usb_rcvctrlpipe(dev->udev, 0),
155 USB_VENDOR_REQUEST_READ_REGISTER,
156 USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
157 00, index, buf, 4, USB_CTRL_GET_TIMEOUT);
163 if (unlikely(ret < 0))
164 pr_warn("Failed to read register index 0x%08x\n", index);
169 /* writes a control register */
170 static int ufx_reg_write(struct ufx_data *dev, u32 index, u32 data)
172 u32 *buf = kmalloc(4, GFP_KERNEL);
183 ret = usb_control_msg(dev->udev, usb_sndctrlpipe(dev->udev, 0),
184 USB_VENDOR_REQUEST_WRITE_REGISTER,
185 USB_DIR_OUT | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
186 00, index, buf, 4, USB_CTRL_SET_TIMEOUT);
190 if (unlikely(ret < 0))
191 pr_warn("Failed to write register index 0x%08x with value "
192 "0x%08x\n", index, data);
197 static int ufx_reg_clear_and_set_bits(struct ufx_data *dev, u32 index,
198 u32 bits_to_clear, u32 bits_to_set)
201 int status = ufx_reg_read(dev, index, &data);
202 check_warn_return(status, "ufx_reg_clear_and_set_bits error reading "
205 data &= (~bits_to_clear);
208 status = ufx_reg_write(dev, index, data);
209 check_warn_return(status, "ufx_reg_clear_and_set_bits error writing "
215 static int ufx_reg_set_bits(struct ufx_data *dev, u32 index, u32 bits)
217 return ufx_reg_clear_and_set_bits(dev, index, 0, bits);
220 static int ufx_reg_clear_bits(struct ufx_data *dev, u32 index, u32 bits)
222 return ufx_reg_clear_and_set_bits(dev, index, bits, 0);
225 static int ufx_lite_reset(struct ufx_data *dev)
230 status = ufx_reg_write(dev, 0x3008, 0x00000001);
231 check_warn_return(status, "ufx_lite_reset error writing 0x3008");
233 status = ufx_reg_read(dev, 0x3008, &value);
234 check_warn_return(status, "ufx_lite_reset error reading 0x3008");
236 return (value == 0) ? 0 : -EIO;
239 /* If display is unblanked, then blank it */
240 static int ufx_blank(struct ufx_data *dev, bool wait)
245 int status = ufx_reg_read(dev, 0x2004, &dc_sts);
246 check_warn_return(status, "ufx_blank error reading 0x2004");
248 status = ufx_reg_read(dev, 0x2000, &dc_ctrl);
249 check_warn_return(status, "ufx_blank error reading 0x2000");
251 /* return success if display is already blanked */
252 if ((dc_sts & 0x00000100) || (dc_ctrl & 0x00000100))
255 /* request the DC to blank the display */
256 dc_ctrl |= 0x00000100;
257 status = ufx_reg_write(dev, 0x2000, dc_ctrl);
258 check_warn_return(status, "ufx_blank error writing 0x2000");
260 /* return success immediately if we don't have to wait */
264 for (i = 0; i < 250; i++) {
265 status = ufx_reg_read(dev, 0x2004, &dc_sts);
266 check_warn_return(status, "ufx_blank error reading 0x2004");
268 if (dc_sts & 0x00000100)
272 /* timed out waiting for display to blank */
276 /* If display is blanked, then unblank it */
277 static int ufx_unblank(struct ufx_data *dev, bool wait)
282 int status = ufx_reg_read(dev, 0x2004, &dc_sts);
283 check_warn_return(status, "ufx_unblank error reading 0x2004");
285 status = ufx_reg_read(dev, 0x2000, &dc_ctrl);
286 check_warn_return(status, "ufx_unblank error reading 0x2000");
288 /* return success if display is already unblanked */
289 if (((dc_sts & 0x00000100) == 0) || ((dc_ctrl & 0x00000100) == 0))
292 /* request the DC to unblank the display */
293 dc_ctrl &= ~0x00000100;
294 status = ufx_reg_write(dev, 0x2000, dc_ctrl);
295 check_warn_return(status, "ufx_unblank error writing 0x2000");
297 /* return success immediately if we don't have to wait */
301 for (i = 0; i < 250; i++) {
302 status = ufx_reg_read(dev, 0x2004, &dc_sts);
303 check_warn_return(status, "ufx_unblank error reading 0x2004");
305 if ((dc_sts & 0x00000100) == 0)
309 /* timed out waiting for display to unblank */
313 /* If display is enabled, then disable it */
314 static int ufx_disable(struct ufx_data *dev, bool wait)
319 int status = ufx_reg_read(dev, 0x2004, &dc_sts);
320 check_warn_return(status, "ufx_disable error reading 0x2004");
322 status = ufx_reg_read(dev, 0x2000, &dc_ctrl);
323 check_warn_return(status, "ufx_disable error reading 0x2000");
325 /* return success if display is already disabled */
326 if (((dc_sts & 0x00000001) == 0) || ((dc_ctrl & 0x00000001) == 0))
329 /* request the DC to disable the display */
330 dc_ctrl &= ~(0x00000001);
331 status = ufx_reg_write(dev, 0x2000, dc_ctrl);
332 check_warn_return(status, "ufx_disable error writing 0x2000");
334 /* return success immediately if we don't have to wait */
338 for (i = 0; i < 250; i++) {
339 status = ufx_reg_read(dev, 0x2004, &dc_sts);
340 check_warn_return(status, "ufx_disable error reading 0x2004");
342 if ((dc_sts & 0x00000001) == 0)
346 /* timed out waiting for display to disable */
350 /* If display is disabled, then enable it */
351 static int ufx_enable(struct ufx_data *dev, bool wait)
356 int status = ufx_reg_read(dev, 0x2004, &dc_sts);
357 check_warn_return(status, "ufx_enable error reading 0x2004");
359 status = ufx_reg_read(dev, 0x2000, &dc_ctrl);
360 check_warn_return(status, "ufx_enable error reading 0x2000");
362 /* return success if display is already enabled */
363 if ((dc_sts & 0x00000001) || (dc_ctrl & 0x00000001))
366 /* request the DC to enable the display */
367 dc_ctrl |= 0x00000001;
368 status = ufx_reg_write(dev, 0x2000, dc_ctrl);
369 check_warn_return(status, "ufx_enable error writing 0x2000");
371 /* return success immediately if we don't have to wait */
375 for (i = 0; i < 250; i++) {
376 status = ufx_reg_read(dev, 0x2004, &dc_sts);
377 check_warn_return(status, "ufx_enable error reading 0x2004");
379 if (dc_sts & 0x00000001)
383 /* timed out waiting for display to enable */
387 static int ufx_config_sys_clk(struct ufx_data *dev)
389 int status = ufx_reg_write(dev, 0x700C, 0x8000000F);
390 check_warn_return(status, "error writing 0x700C");
392 status = ufx_reg_write(dev, 0x7014, 0x0010024F);
393 check_warn_return(status, "error writing 0x7014");
395 status = ufx_reg_write(dev, 0x7010, 0x00000000);
396 check_warn_return(status, "error writing 0x7010");
398 status = ufx_reg_clear_bits(dev, 0x700C, 0x0000000A);
399 check_warn_return(status, "error clearing PLL1 bypass in 0x700C");
402 status = ufx_reg_clear_bits(dev, 0x700C, 0x80000000);
403 check_warn_return(status, "error clearing output gate in 0x700C");
408 static int ufx_config_ddr2(struct ufx_data *dev)
413 status = ufx_reg_write(dev, 0x0004, 0x001F0F77);
414 check_warn_return(status, "error writing 0x0004");
416 status = ufx_reg_write(dev, 0x0008, 0xFFF00000);
417 check_warn_return(status, "error writing 0x0008");
419 status = ufx_reg_write(dev, 0x000C, 0x0FFF2222);
420 check_warn_return(status, "error writing 0x000C");
422 status = ufx_reg_write(dev, 0x0010, 0x00030814);
423 check_warn_return(status, "error writing 0x0010");
425 status = ufx_reg_write(dev, 0x0014, 0x00500019);
426 check_warn_return(status, "error writing 0x0014");
428 status = ufx_reg_write(dev, 0x0018, 0x020D0F15);
429 check_warn_return(status, "error writing 0x0018");
431 status = ufx_reg_write(dev, 0x001C, 0x02532305);
432 check_warn_return(status, "error writing 0x001C");
434 status = ufx_reg_write(dev, 0x0020, 0x0B030905);
435 check_warn_return(status, "error writing 0x0020");
437 status = ufx_reg_write(dev, 0x0024, 0x00000827);
438 check_warn_return(status, "error writing 0x0024");
440 status = ufx_reg_write(dev, 0x0028, 0x00000000);
441 check_warn_return(status, "error writing 0x0028");
443 status = ufx_reg_write(dev, 0x002C, 0x00000042);
444 check_warn_return(status, "error writing 0x002C");
446 status = ufx_reg_write(dev, 0x0030, 0x09520000);
447 check_warn_return(status, "error writing 0x0030");
449 status = ufx_reg_write(dev, 0x0034, 0x02223314);
450 check_warn_return(status, "error writing 0x0034");
452 status = ufx_reg_write(dev, 0x0038, 0x00430043);
453 check_warn_return(status, "error writing 0x0038");
455 status = ufx_reg_write(dev, 0x003C, 0xF00F000F);
456 check_warn_return(status, "error writing 0x003C");
458 status = ufx_reg_write(dev, 0x0040, 0xF380F00F);
459 check_warn_return(status, "error writing 0x0040");
461 status = ufx_reg_write(dev, 0x0044, 0xF00F0496);
462 check_warn_return(status, "error writing 0x0044");
464 status = ufx_reg_write(dev, 0x0048, 0x03080406);
465 check_warn_return(status, "error writing 0x0048");
467 status = ufx_reg_write(dev, 0x004C, 0x00001000);
468 check_warn_return(status, "error writing 0x004C");
470 status = ufx_reg_write(dev, 0x005C, 0x00000007);
471 check_warn_return(status, "error writing 0x005C");
473 status = ufx_reg_write(dev, 0x0100, 0x54F00012);
474 check_warn_return(status, "error writing 0x0100");
476 status = ufx_reg_write(dev, 0x0104, 0x00004012);
477 check_warn_return(status, "error writing 0x0104");
479 status = ufx_reg_write(dev, 0x0118, 0x40404040);
480 check_warn_return(status, "error writing 0x0118");
482 status = ufx_reg_write(dev, 0x0000, 0x00000001);
483 check_warn_return(status, "error writing 0x0000");
486 status = ufx_reg_read(dev, 0x0000, &tmp);
487 check_warn_return(status, "error reading 0x0000");
489 if (all_bits_set(tmp, 0xC0000000))
493 pr_err("DDR2 initialisation timed out, reg 0x0000=0x%08x", tmp);
508 static u32 ufx_calc_range(u32 ref_freq)
510 if (ref_freq >= 88000000)
513 if (ref_freq >= 54000000)
516 if (ref_freq >= 34000000)
519 if (ref_freq >= 21000000)
522 if (ref_freq >= 13000000)
525 if (ref_freq >= 8000000)
531 /* calculates PLL divider settings for a desired target frequency */
532 static void ufx_calc_pll_values(const u32 clk_pixel_pll, struct pll_values *asic_pll)
534 const u32 ref_clk = 25000000;
535 u32 div_r0, div_f0, div_q0, div_r1, div_f1, div_q1;
536 u32 min_error = clk_pixel_pll;
538 for (div_r0 = 1; div_r0 <= 32; div_r0++) {
539 u32 ref_freq0 = ref_clk / div_r0;
540 if (ref_freq0 < 5000000)
543 if (ref_freq0 > 200000000)
546 for (div_f0 = 1; div_f0 <= 256; div_f0++) {
547 u32 vco_freq0 = ref_freq0 * div_f0;
549 if (vco_freq0 < 350000000)
552 if (vco_freq0 > 700000000)
555 for (div_q0 = 0; div_q0 < 7; div_q0++) {
556 u32 pllout_freq0 = vco_freq0 / (1 << div_q0);
558 if (pllout_freq0 < 5000000)
561 if (pllout_freq0 > 200000000)
564 for (div_r1 = 1; div_r1 <= 32; div_r1++) {
565 u32 ref_freq1 = pllout_freq0 / div_r1;
567 if (ref_freq1 < 5000000)
570 for (div_f1 = 1; div_f1 <= 256; div_f1++) {
571 u32 vco_freq1 = ref_freq1 * div_f1;
573 if (vco_freq1 < 350000000)
576 if (vco_freq1 > 700000000)
579 for (div_q1 = 0; div_q1 < 7; div_q1++) {
580 u32 pllout_freq1 = vco_freq1 / (1 << div_q1);
581 int error = abs(pllout_freq1 - clk_pixel_pll);
583 if (pllout_freq1 < 5000000)
586 if (pllout_freq1 > 700000000)
589 if (error < min_error) {
592 /* final returned value is equal to calculated value - 1
593 * because a value of 0 = divide by 1 */
594 asic_pll->div_r0 = div_r0 - 1;
595 asic_pll->div_f0 = div_f0 - 1;
596 asic_pll->div_q0 = div_q0;
597 asic_pll->div_r1 = div_r1 - 1;
598 asic_pll->div_f1 = div_f1 - 1;
599 asic_pll->div_q1 = div_q1;
601 asic_pll->range0 = ufx_calc_range(ref_freq0);
602 asic_pll->range1 = ufx_calc_range(ref_freq1);
615 /* sets analog bit PLL configuration values */
616 static int ufx_config_pix_clk(struct ufx_data *dev, u32 pixclock)
618 struct pll_values asic_pll = {0};
619 u32 value, clk_pixel, clk_pixel_pll;
622 /* convert pixclock (in ps) to frequency (in Hz) */
623 clk_pixel = PICOS2KHZ(pixclock) * 1000;
624 pr_debug("pixclock %d ps = clk_pixel %d Hz", pixclock, clk_pixel);
626 /* clk_pixel = 1/2 clk_pixel_pll */
627 clk_pixel_pll = clk_pixel * 2;
629 ufx_calc_pll_values(clk_pixel_pll, &asic_pll);
631 /* Keep BYPASS and RESET signals asserted until configured */
632 status = ufx_reg_write(dev, 0x7000, 0x8000000F);
633 check_warn_return(status, "error writing 0x7000");
635 value = (asic_pll.div_f1 | (asic_pll.div_r1 << 8) |
636 (asic_pll.div_q1 << 16) | (asic_pll.range1 << 20));
637 status = ufx_reg_write(dev, 0x7008, value);
638 check_warn_return(status, "error writing 0x7008");
640 value = (asic_pll.div_f0 | (asic_pll.div_r0 << 8) |
641 (asic_pll.div_q0 << 16) | (asic_pll.range0 << 20));
642 status = ufx_reg_write(dev, 0x7004, value);
643 check_warn_return(status, "error writing 0x7004");
645 status = ufx_reg_clear_bits(dev, 0x7000, 0x00000005);
646 check_warn_return(status,
647 "error clearing PLL0 bypass bits in 0x7000");
650 status = ufx_reg_clear_bits(dev, 0x7000, 0x0000000A);
651 check_warn_return(status,
652 "error clearing PLL1 bypass bits in 0x7000");
655 status = ufx_reg_clear_bits(dev, 0x7000, 0x80000000);
656 check_warn_return(status, "error clearing gate bits in 0x7000");
661 static int ufx_set_vid_mode(struct ufx_data *dev, struct fb_var_screeninfo *var)
664 u16 h_total, h_active, h_blank_start, h_blank_end, h_sync_start, h_sync_end;
665 u16 v_total, v_active, v_blank_start, v_blank_end, v_sync_start, v_sync_end;
667 int status = ufx_reg_write(dev, 0x8028, 0);
668 check_warn_return(status, "ufx_set_vid_mode error disabling RGB pad");
670 status = ufx_reg_write(dev, 0x8024, 0);
671 check_warn_return(status, "ufx_set_vid_mode error disabling VDAC");
673 /* shut everything down before changing timing */
674 status = ufx_blank(dev, true);
675 check_warn_return(status, "ufx_set_vid_mode error blanking display");
677 status = ufx_disable(dev, true);
678 check_warn_return(status, "ufx_set_vid_mode error disabling display");
680 status = ufx_config_pix_clk(dev, var->pixclock);
681 check_warn_return(status, "ufx_set_vid_mode error configuring pixclock");
683 status = ufx_reg_write(dev, 0x2000, 0x00000104);
684 check_warn_return(status, "ufx_set_vid_mode error writing 0x2000");
686 /* set horizontal timings */
687 h_total = var->xres + var->right_margin + var->hsync_len + var->left_margin;
688 h_active = var->xres;
689 h_blank_start = var->xres + var->right_margin;
690 h_blank_end = var->xres + var->right_margin + var->hsync_len;
691 h_sync_start = var->xres + var->right_margin;
692 h_sync_end = var->xres + var->right_margin + var->hsync_len;
694 temp = ((h_total - 1) << 16) | (h_active - 1);
695 status = ufx_reg_write(dev, 0x2008, temp);
696 check_warn_return(status, "ufx_set_vid_mode error writing 0x2008");
698 temp = ((h_blank_start - 1) << 16) | (h_blank_end - 1);
699 status = ufx_reg_write(dev, 0x200C, temp);
700 check_warn_return(status, "ufx_set_vid_mode error writing 0x200C");
702 temp = ((h_sync_start - 1) << 16) | (h_sync_end - 1);
703 status = ufx_reg_write(dev, 0x2010, temp);
704 check_warn_return(status, "ufx_set_vid_mode error writing 0x2010");
706 /* set vertical timings */
707 v_total = var->upper_margin + var->yres + var->lower_margin + var->vsync_len;
708 v_active = var->yres;
709 v_blank_start = var->yres + var->lower_margin;
710 v_blank_end = var->yres + var->lower_margin + var->vsync_len;
711 v_sync_start = var->yres + var->lower_margin;
712 v_sync_end = var->yres + var->lower_margin + var->vsync_len;
714 temp = ((v_total - 1) << 16) | (v_active - 1);
715 status = ufx_reg_write(dev, 0x2014, temp);
716 check_warn_return(status, "ufx_set_vid_mode error writing 0x2014");
718 temp = ((v_blank_start - 1) << 16) | (v_blank_end - 1);
719 status = ufx_reg_write(dev, 0x2018, temp);
720 check_warn_return(status, "ufx_set_vid_mode error writing 0x2018");
722 temp = ((v_sync_start - 1) << 16) | (v_sync_end - 1);
723 status = ufx_reg_write(dev, 0x201C, temp);
724 check_warn_return(status, "ufx_set_vid_mode error writing 0x201C");
726 status = ufx_reg_write(dev, 0x2020, 0x00000000);
727 check_warn_return(status, "ufx_set_vid_mode error writing 0x2020");
729 status = ufx_reg_write(dev, 0x2024, 0x00000000);
730 check_warn_return(status, "ufx_set_vid_mode error writing 0x2024");
732 /* Set the frame length register (#pix * 2 bytes/pixel) */
733 temp = var->xres * var->yres * 2;
734 temp = (temp + 7) & (~0x7);
735 status = ufx_reg_write(dev, 0x2028, temp);
736 check_warn_return(status, "ufx_set_vid_mode error writing 0x2028");
738 /* enable desired output interface & disable others */
739 status = ufx_reg_write(dev, 0x2040, 0);
740 check_warn_return(status, "ufx_set_vid_mode error writing 0x2040");
742 status = ufx_reg_write(dev, 0x2044, 0);
743 check_warn_return(status, "ufx_set_vid_mode error writing 0x2044");
745 status = ufx_reg_write(dev, 0x2048, 0);
746 check_warn_return(status, "ufx_set_vid_mode error writing 0x2048");
748 /* set the sync polarities & enable bit */
750 if (var->sync & FB_SYNC_HOR_HIGH_ACT)
753 if (var->sync & FB_SYNC_VERT_HIGH_ACT)
756 status = ufx_reg_write(dev, 0x2040, temp);
757 check_warn_return(status, "ufx_set_vid_mode error writing 0x2040");
759 /* start everything back up */
760 status = ufx_enable(dev, true);
761 check_warn_return(status, "ufx_set_vid_mode error enabling display");
763 /* Unblank the display */
764 status = ufx_unblank(dev, true);
765 check_warn_return(status, "ufx_set_vid_mode error unblanking display");
768 status = ufx_reg_write(dev, 0x8028, 0x00000003);
769 check_warn_return(status, "ufx_set_vid_mode error enabling RGB pad");
772 status = ufx_reg_write(dev, 0x8024, 0x00000007);
773 check_warn_return(status, "ufx_set_vid_mode error enabling VDAC");
778 static int ufx_ops_mmap(struct fb_info *info, struct vm_area_struct *vma)
780 unsigned long start = vma->vm_start;
781 unsigned long size = vma->vm_end - vma->vm_start;
782 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
783 unsigned long page, pos;
785 if (offset + size > info->fix.smem_len)
788 pos = (unsigned long)info->fix.smem_start + offset;
790 pr_debug("mmap() framebuffer addr:%lu size:%lu\n",
794 page = vmalloc_to_pfn((void *)pos);
795 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
800 if (size > PAGE_SIZE)
806 vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */
810 static void ufx_raw_rect(struct ufx_data *dev, u16 *cmd, int x, int y,
811 int width, int height)
813 size_t packed_line_len = ALIGN((width * 2), 4);
814 size_t packed_rect_len = packed_line_len * height;
821 *((u32 *)&cmd[0]) = cpu_to_le32(0x01);
824 *((u32 *)&cmd[2]) = cpu_to_le32(packed_rect_len + 16);
826 cmd[4] = cpu_to_le16(x);
827 cmd[5] = cpu_to_le16(y);
828 cmd[6] = cpu_to_le16(width);
829 cmd[7] = cpu_to_le16(height);
831 /* frame base address */
832 *((u32 *)&cmd[8]) = cpu_to_le32(0);
834 /* color mode and horizontal resolution */
835 cmd[10] = cpu_to_le16(0x4000 | dev->info->var.xres);
837 /* vertical resolution */
838 cmd[11] = cpu_to_le16(dev->info->var.yres);
841 for (line = 0; line < height; line++) {
842 const int line_offset = dev->info->fix.line_length * (y + line);
843 const int byte_offset = line_offset + (x * BPP);
844 memcpy(&cmd[(24 + (packed_line_len * line)) / 2],
845 (char *)dev->info->fix.smem_start + byte_offset, width * BPP);
849 int ufx_handle_damage(struct ufx_data *dev, int x, int y,
850 int width, int height)
852 size_t packed_line_len = ALIGN((width * 2), 4);
853 int len, status, urb_lines, start_line = 0;
855 if ((width <= 0) || (height <= 0) ||
856 (x + width > dev->info->var.xres) ||
857 (y + height > dev->info->var.yres))
860 if (!atomic_read(&dev->usb_active))
863 while (start_line < height) {
864 struct urb *urb = ufx_get_urb(dev);
866 pr_warn("ufx_handle_damage unable to get urb");
870 /* assume we have enough space to transfer at least one line */
871 BUG_ON(urb->transfer_buffer_length < (24 + (width * 2)));
873 /* calculate the maximum number of lines we could fit in */
874 urb_lines = (urb->transfer_buffer_length - 24) / packed_line_len;
876 /* but we might not need this many */
877 urb_lines = min(urb_lines, (height - start_line));
879 memset(urb->transfer_buffer, 0, urb->transfer_buffer_length);
881 ufx_raw_rect(dev, urb->transfer_buffer, x, (y + start_line), width, urb_lines);
882 len = 24 + (packed_line_len * urb_lines);
884 status = ufx_submit_urb(dev, urb, len);
885 check_warn_return(status, "Error submitting URB");
887 start_line += urb_lines;
893 /* Path triggered by usermode clients who write to filesystem
894 * e.g. cat filename > /dev/fb1
895 * Not used by X Windows or text-mode console. But useful for testing.
896 * Slow because of extra copy and we must assume all pixels dirty. */
897 static ssize_t ufx_ops_write(struct fb_info *info, const char __user *buf,
898 size_t count, loff_t *ppos)
901 struct ufx_data *dev = info->par;
902 u32 offset = (u32) *ppos;
904 result = fb_sys_write(info, buf, count, ppos);
907 int start = max((int)(offset / info->fix.line_length) - 1, 0);
908 int lines = min((u32)((result / info->fix.line_length) + 1),
909 (u32)info->var.yres);
911 ufx_handle_damage(dev, 0, start, info->var.xres, lines);
917 static void ufx_ops_copyarea(struct fb_info *info,
918 const struct fb_copyarea *area)
921 struct ufx_data *dev = info->par;
923 sys_copyarea(info, area);
925 ufx_handle_damage(dev, area->dx, area->dy,
926 area->width, area->height);
929 static void ufx_ops_imageblit(struct fb_info *info,
930 const struct fb_image *image)
932 struct ufx_data *dev = info->par;
934 sys_imageblit(info, image);
936 ufx_handle_damage(dev, image->dx, image->dy,
937 image->width, image->height);
940 static void ufx_ops_fillrect(struct fb_info *info,
941 const struct fb_fillrect *rect)
943 struct ufx_data *dev = info->par;
945 sys_fillrect(info, rect);
947 ufx_handle_damage(dev, rect->dx, rect->dy, rect->width,
951 /* NOTE: fb_defio.c is holding info->fbdefio.mutex
952 * Touching ANY framebuffer memory that triggers a page fault
953 * in fb_defio will cause a deadlock, when it also tries to
954 * grab the same mutex. */
955 static void ufx_dpy_deferred_io(struct fb_info *info,
956 struct list_head *pagelist)
959 struct fb_deferred_io *fbdefio = info->fbdefio;
960 struct ufx_data *dev = info->par;
965 if (!atomic_read(&dev->usb_active))
968 /* walk the written page list and render each to device */
969 list_for_each_entry(cur, &fbdefio->pagelist, lru) {
970 /* create a rectangle of full screen width that encloses the
971 * entire dirty framebuffer page */
973 const int width = dev->info->var.xres;
974 const int y = (cur->index << PAGE_SHIFT) / (width * 2);
975 int height = (PAGE_SIZE / (width * 2)) + 1;
976 height = min(height, (int)(dev->info->var.yres - y));
978 BUG_ON(y >= dev->info->var.yres);
979 BUG_ON((y + height) > dev->info->var.yres);
981 ufx_handle_damage(dev, x, y, width, height);
985 static int ufx_ops_ioctl(struct fb_info *info, unsigned int cmd,
988 struct ufx_data *dev = info->par;
989 struct dloarea *area = NULL;
991 if (!atomic_read(&dev->usb_active))
994 /* TODO: Update X server to get this from sysfs instead */
995 if (cmd == UFX_IOCTL_RETURN_EDID) {
996 u8 __user *edid = (u8 __user *)arg;
997 if (copy_to_user(edid, dev->edid, dev->edid_size))
1002 /* TODO: Help propose a standard fb.h ioctl to report mmap damage */
1003 if (cmd == UFX_IOCTL_REPORT_DAMAGE) {
1004 /* If we have a damage-aware client, turn fb_defio "off"
1005 * To avoid perf imact of unecessary page fault handling.
1006 * Done by resetting the delay for this fb_info to a very
1007 * long period. Pages will become writable and stay that way.
1008 * Reset to normal value when all clients have closed this fb.
1011 info->fbdefio->delay = UFX_DEFIO_WRITE_DISABLE;
1013 area = (struct dloarea *)arg;
1018 if (area->x > info->var.xres)
1019 area->x = info->var.xres;
1024 if (area->y > info->var.yres)
1025 area->y = info->var.yres;
1027 ufx_handle_damage(dev, area->x, area->y, area->w, area->h);
1033 /* taken from vesafb */
1035 ufx_ops_setcolreg(unsigned regno, unsigned red, unsigned green,
1036 unsigned blue, unsigned transp, struct fb_info *info)
1040 if (regno >= info->cmap.len)
1044 if (info->var.red.offset == 10) {
1046 ((u32 *) (info->pseudo_palette))[regno] =
1047 ((red & 0xf800) >> 1) |
1048 ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11);
1051 ((u32 *) (info->pseudo_palette))[regno] =
1053 ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11);
1060 /* It's common for several clients to have framebuffer open simultaneously.
1061 * e.g. both fbcon and X. Makes things interesting.
1062 * Assumes caller is holding info->lock (for open and release at least) */
1063 static int ufx_ops_open(struct fb_info *info, int user)
1065 struct ufx_data *dev = info->par;
1067 /* fbcon aggressively connects to first framebuffer it finds,
1068 * preventing other clients (X) from working properly. Usually
1069 * not what the user wants. Fail by default with option to enable. */
1070 if (user == 0 && !console)
1073 /* If the USB device is gone, we don't accept new opens */
1074 if (dev->virtualized)
1079 kref_get(&dev->kref);
1081 if (fb_defio && (info->fbdefio == NULL)) {
1082 /* enable defio at last moment if not disabled by client */
1084 struct fb_deferred_io *fbdefio;
1086 fbdefio = kzalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
1089 fbdefio->delay = UFX_DEFIO_WRITE_DELAY;
1090 fbdefio->deferred_io = ufx_dpy_deferred_io;
1093 info->fbdefio = fbdefio;
1094 fb_deferred_io_init(info);
1097 pr_debug("open /dev/fb%d user=%d fb_info=%p count=%d",
1098 info->node, user, info, dev->fb_count);
1104 * Called when all client interfaces to start transactions have been disabled,
1105 * and all references to our device instance (ufx_data) are released.
1106 * Every transaction must have a reference, so we know are fully spun down
1108 static void ufx_free(struct kref *kref)
1110 struct ufx_data *dev = container_of(kref, struct ufx_data, kref);
1112 /* this function will wait for all in-flight urbs to complete */
1113 if (dev->urbs.count > 0)
1114 ufx_free_urb_list(dev);
1116 pr_debug("freeing ufx_data %p", dev);
1121 static void ufx_release_urb_work(struct work_struct *work)
1123 struct urb_node *unode = container_of(work, struct urb_node,
1124 release_urb_work.work);
1126 up(&unode->dev->urbs.limit_sem);
1129 static void ufx_free_framebuffer_work(struct work_struct *work)
1131 struct ufx_data *dev = container_of(work, struct ufx_data,
1132 free_framebuffer_work.work);
1133 struct fb_info *info = dev->info;
1134 int node = info->node;
1136 unregister_framebuffer(info);
1138 if (info->cmap.len != 0)
1139 fb_dealloc_cmap(&info->cmap);
1140 if (info->monspecs.modedb)
1141 fb_destroy_modedb(info->monspecs.modedb);
1142 if (info->screen_base)
1143 vfree(info->screen_base);
1145 fb_destroy_modelist(&info->modelist);
1149 /* Assume info structure is freed after this point */
1150 framebuffer_release(info);
1152 pr_debug("fb_info for /dev/fb%d has been freed", node);
1154 /* ref taken in probe() as part of registering framebfufer */
1155 kref_put(&dev->kref, ufx_free);
1159 * Assumes caller is holding info->lock mutex (for open and release at least)
1161 static int ufx_ops_release(struct fb_info *info, int user)
1163 struct ufx_data *dev = info->par;
1167 /* We can't free fb_info here - fbmem will touch it when we return */
1168 if (dev->virtualized && (dev->fb_count == 0))
1169 schedule_delayed_work(&dev->free_framebuffer_work, HZ);
1171 if ((dev->fb_count == 0) && (info->fbdefio)) {
1172 fb_deferred_io_cleanup(info);
1173 kfree(info->fbdefio);
1174 info->fbdefio = NULL;
1175 info->fbops->fb_mmap = ufx_ops_mmap;
1178 pr_debug("released /dev/fb%d user=%d count=%d",
1179 info->node, user, dev->fb_count);
1181 kref_put(&dev->kref, ufx_free);
1186 /* Check whether a video mode is supported by the chip
1187 * We start from monitor's modes, so don't need to filter that here */
1188 static int ufx_is_valid_mode(struct fb_videomode *mode,
1189 struct fb_info *info)
1191 if ((mode->xres * mode->yres) > (2048 * 1152)) {
1192 pr_debug("%dx%d too many pixels",
1193 mode->xres, mode->yres);
1197 if (mode->pixclock < 5000) {
1198 pr_debug("%dx%d %dps pixel clock too fast",
1199 mode->xres, mode->yres, mode->pixclock);
1203 pr_debug("%dx%d (pixclk %dps %dMHz) valid mode", mode->xres, mode->yres,
1204 mode->pixclock, (1000000 / mode->pixclock));
1208 static void ufx_var_color_format(struct fb_var_screeninfo *var)
1210 const struct fb_bitfield red = { 11, 5, 0 };
1211 const struct fb_bitfield green = { 5, 6, 0 };
1212 const struct fb_bitfield blue = { 0, 5, 0 };
1214 var->bits_per_pixel = 16;
1220 static int ufx_ops_check_var(struct fb_var_screeninfo *var,
1221 struct fb_info *info)
1223 struct fb_videomode mode;
1225 /* TODO: support dynamically changing framebuffer size */
1226 if ((var->xres * var->yres * 2) > info->fix.smem_len)
1229 /* set device-specific elements of var unrelated to mode */
1230 ufx_var_color_format(var);
1232 fb_var_to_videomode(&mode, var);
1234 if (!ufx_is_valid_mode(&mode, info))
1240 static int ufx_ops_set_par(struct fb_info *info)
1242 struct ufx_data *dev = info->par;
1244 u16 *pix_framebuffer;
1247 pr_debug("set_par mode %dx%d", info->var.xres, info->var.yres);
1248 result = ufx_set_vid_mode(dev, &info->var);
1250 if ((result == 0) && (dev->fb_count == 0)) {
1251 /* paint greenscreen */
1252 pix_framebuffer = (u16 *) info->screen_base;
1253 for (i = 0; i < info->fix.smem_len / 2; i++)
1254 pix_framebuffer[i] = 0x37e6;
1256 ufx_handle_damage(dev, 0, 0, info->var.xres, info->var.yres);
1259 /* re-enable defio if previously disabled by damage tracking */
1261 info->fbdefio->delay = UFX_DEFIO_WRITE_DELAY;
1266 /* In order to come back from full DPMS off, we need to set the mode again */
1267 static int ufx_ops_blank(int blank_mode, struct fb_info *info)
1269 struct ufx_data *dev = info->par;
1270 ufx_set_vid_mode(dev, &info->var);
1274 static struct fb_ops ufx_ops = {
1275 .owner = THIS_MODULE,
1276 .fb_read = fb_sys_read,
1277 .fb_write = ufx_ops_write,
1278 .fb_setcolreg = ufx_ops_setcolreg,
1279 .fb_fillrect = ufx_ops_fillrect,
1280 .fb_copyarea = ufx_ops_copyarea,
1281 .fb_imageblit = ufx_ops_imageblit,
1282 .fb_mmap = ufx_ops_mmap,
1283 .fb_ioctl = ufx_ops_ioctl,
1284 .fb_open = ufx_ops_open,
1285 .fb_release = ufx_ops_release,
1286 .fb_blank = ufx_ops_blank,
1287 .fb_check_var = ufx_ops_check_var,
1288 .fb_set_par = ufx_ops_set_par,
1291 /* Assumes &info->lock held by caller
1292 * Assumes no active clients have framebuffer open */
1293 static int ufx_realloc_framebuffer(struct ufx_data *dev, struct fb_info *info)
1295 int retval = -ENOMEM;
1296 int old_len = info->fix.smem_len;
1298 unsigned char *old_fb = info->screen_base;
1299 unsigned char *new_fb;
1301 pr_debug("Reallocating framebuffer. Addresses will change!");
1303 new_len = info->fix.line_length * info->var.yres;
1305 if (PAGE_ALIGN(new_len) > old_len) {
1307 * Alloc system memory for virtual framebuffer
1309 new_fb = vmalloc(new_len);
1311 pr_err("Virtual framebuffer alloc failed");
1315 if (info->screen_base) {
1316 memcpy(new_fb, old_fb, old_len);
1317 vfree(info->screen_base);
1320 info->screen_base = new_fb;
1321 info->fix.smem_len = PAGE_ALIGN(new_len);
1322 info->fix.smem_start = (unsigned long) new_fb;
1323 info->flags = smscufx_info_flags;
1332 /* sets up I2C Controller for 100 Kbps, std. speed, 7-bit addr, master,
1333 * restart enabled, but no start byte, enable controller */
1334 static int ufx_i2c_init(struct ufx_data *dev)
1338 /* disable the controller before it can be reprogrammed */
1339 int status = ufx_reg_write(dev, 0x106C, 0x00);
1340 check_warn_return(status, "failed to disable I2C");
1342 /* Setup the clock count registers
1343 * (12+1) = 13 clks @ 2.5 MHz = 5.2 uS */
1344 status = ufx_reg_write(dev, 0x1018, 12);
1345 check_warn_return(status, "error writing 0x1018");
1347 /* (6+8) = 14 clks @ 2.5 MHz = 5.6 uS */
1348 status = ufx_reg_write(dev, 0x1014, 6);
1349 check_warn_return(status, "error writing 0x1014");
1351 status = ufx_reg_read(dev, 0x1000, &tmp);
1352 check_warn_return(status, "error reading 0x1000");
1354 /* set speed to std mode */
1358 /* 7-bit (not 10-bit) addressing */
1361 /* enable restart conditions and master mode */
1364 status = ufx_reg_write(dev, 0x1000, tmp);
1365 check_warn_return(status, "error writing 0x1000");
1367 /* Set normal tx using target address 0 */
1368 status = ufx_reg_clear_and_set_bits(dev, 0x1004, 0xC00, 0x000);
1369 check_warn_return(status, "error setting TX mode bits in 0x1004");
1371 /* Enable the controller */
1372 status = ufx_reg_write(dev, 0x106C, 0x01);
1373 check_warn_return(status, "failed to enable I2C");
1378 /* sets the I2C port mux and target address */
1379 static int ufx_i2c_configure(struct ufx_data *dev)
1381 int status = ufx_reg_write(dev, 0x106C, 0x00);
1382 check_warn_return(status, "failed to disable I2C");
1384 status = ufx_reg_write(dev, 0x3010, 0x00000000);
1385 check_warn_return(status, "failed to write 0x3010");
1387 /* A0h is std for any EDID, right shifted by one */
1388 status = ufx_reg_clear_and_set_bits(dev, 0x1004, 0x3FF, (0xA0 >> 1));
1389 check_warn_return(status, "failed to set TAR bits in 0x1004");
1391 status = ufx_reg_write(dev, 0x106C, 0x01);
1392 check_warn_return(status, "failed to enable I2C");
1397 /* wait for BUSY to clear, with a timeout of 50ms with 10ms sleeps. if no
1398 * monitor is connected, there is no error except for timeout */
1399 static int ufx_i2c_wait_busy(struct ufx_data *dev)
1404 for (i = 0; i < 15; i++) {
1405 status = ufx_reg_read(dev, 0x1100, &tmp);
1406 check_warn_return(status, "0x1100 read failed");
1408 /* if BUSY is clear, check for error */
1409 if ((tmp & 0x80000000) == 0) {
1410 if (tmp & 0x20000000) {
1411 pr_warn("I2C read failed, 0x1100=0x%08x", tmp);
1418 /* perform the first 10 retries without delay */
1423 pr_warn("I2C access timed out, resetting I2C hardware");
1424 status = ufx_reg_write(dev, 0x1100, 0x40000000);
1425 check_warn_return(status, "0x1100 write failed");
1430 /* reads a 128-byte EDID block from the currently selected port and TAR */
1431 static int ufx_read_edid(struct ufx_data *dev, u8 *edid, int edid_len)
1434 u32 *edid_u32 = (u32 *)edid;
1436 BUG_ON(edid_len != EDID_LENGTH);
1438 status = ufx_i2c_configure(dev);
1440 pr_err("ufx_i2c_configure failed");
1444 memset(edid, 0xff, EDID_LENGTH);
1446 /* Read the 128-byte EDID as 2 bursts of 64 bytes */
1447 for (i = 0; i < 2; i++) {
1448 u32 temp = 0x28070000 | (63 << 20) | (((u32)(i * 64)) << 8);
1449 status = ufx_reg_write(dev, 0x1100, temp);
1450 check_warn_return(status, "Failed to write 0x1100");
1453 status = ufx_reg_write(dev, 0x1100, temp);
1454 check_warn_return(status, "Failed to write 0x1100");
1456 status = ufx_i2c_wait_busy(dev);
1457 check_warn_return(status, "Timeout waiting for I2C BUSY to clear");
1459 for (j = 0; j < 16; j++) {
1460 u32 data_reg_addr = 0x1110 + (j * 4);
1461 status = ufx_reg_read(dev, data_reg_addr, edid_u32++);
1462 check_warn_return(status, "Error reading i2c data");
1466 /* all FF's in the first 16 bytes indicates nothing is connected */
1467 for (i = 0; i < 16; i++) {
1468 if (edid[i] != 0xFF) {
1469 pr_debug("edid data read succesfully");
1474 pr_warn("edid data contains all 0xff");
1478 /* 1) use sw default
1479 * 2) Parse into various fb_info structs
1480 * 3) Allocate virtual framebuffer memory to back highest res mode
1482 * Parses EDID into three places used by various parts of fbdev:
1483 * fb_var_screeninfo contains the timing of the monitor's preferred mode
1484 * fb_info.monspecs is full parsed EDID info, including monspecs.modedb
1485 * fb_info.modelist is a linked list of all monitor & VESA modes which work
1487 * If EDID is not readable/valid, then modelist is all VESA modes,
1488 * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode
1489 * Returns 0 if successful */
1490 static int ufx_setup_modes(struct ufx_data *dev, struct fb_info *info,
1491 char *default_edid, size_t default_edid_size)
1493 const struct fb_videomode *default_vmode = NULL;
1495 int i, result = 0, tries = 3;
1497 if (info->dev) /* only use mutex if info has been registered */
1498 mutex_lock(&info->lock);
1500 edid = kmalloc(EDID_LENGTH, GFP_KERNEL);
1506 fb_destroy_modelist(&info->modelist);
1507 memset(&info->monspecs, 0, sizeof(info->monspecs));
1509 /* Try to (re)read EDID from hardware first
1510 * EDID data may return, but not parse as valid
1511 * Try again a few times, in case of e.g. analog cable noise */
1513 i = ufx_read_edid(dev, edid, EDID_LENGTH);
1515 if (i >= EDID_LENGTH)
1516 fb_edid_to_monspecs(edid, &info->monspecs);
1518 if (info->monspecs.modedb_len > 0) {
1525 /* If that fails, use a previously returned EDID if available */
1526 if (info->monspecs.modedb_len == 0) {
1527 pr_err("Unable to get valid EDID from device/display\n");
1530 fb_edid_to_monspecs(dev->edid, &info->monspecs);
1531 if (info->monspecs.modedb_len > 0)
1532 pr_err("Using previously queried EDID\n");
1536 /* If that fails, use the default EDID we were handed */
1537 if (info->monspecs.modedb_len == 0) {
1538 if (default_edid_size >= EDID_LENGTH) {
1539 fb_edid_to_monspecs(default_edid, &info->monspecs);
1540 if (info->monspecs.modedb_len > 0) {
1541 memcpy(edid, default_edid, default_edid_size);
1543 dev->edid_size = default_edid_size;
1544 pr_err("Using default/backup EDID\n");
1549 /* If we've got modes, let's pick a best default mode */
1550 if (info->monspecs.modedb_len > 0) {
1552 for (i = 0; i < info->monspecs.modedb_len; i++) {
1553 if (ufx_is_valid_mode(&info->monspecs.modedb[i], info))
1554 fb_add_videomode(&info->monspecs.modedb[i],
1556 else /* if we've removed top/best mode */
1557 info->monspecs.misc &= ~FB_MISC_1ST_DETAIL;
1560 default_vmode = fb_find_best_display(&info->monspecs,
1564 /* If everything else has failed, fall back to safe default mode */
1565 if (default_vmode == NULL) {
1567 struct fb_videomode fb_vmode = {0};
1569 /* Add the standard VESA modes to our modelist
1570 * Since we don't have EDID, there may be modes that
1571 * overspec monitor and/or are incorrect aspect ratio, etc.
1572 * But at least the user has a chance to choose
1574 for (i = 0; i < VESA_MODEDB_SIZE; i++) {
1575 if (ufx_is_valid_mode((struct fb_videomode *)
1576 &vesa_modes[i], info))
1577 fb_add_videomode(&vesa_modes[i],
1581 /* default to resolution safe for projectors
1582 * (since they are most common case without EDID)
1584 fb_vmode.xres = 800;
1585 fb_vmode.yres = 600;
1586 fb_vmode.refresh = 60;
1587 default_vmode = fb_find_nearest_mode(&fb_vmode,
1591 /* If we have good mode and no active clients */
1592 if ((default_vmode != NULL) && (dev->fb_count == 0)) {
1594 fb_videomode_to_var(&info->var, default_vmode);
1595 ufx_var_color_format(&info->var);
1597 /* with mode size info, we can now alloc our framebuffer */
1598 memcpy(&info->fix, &ufx_fix, sizeof(ufx_fix));
1599 info->fix.line_length = info->var.xres *
1600 (info->var.bits_per_pixel / 8);
1602 result = ufx_realloc_framebuffer(dev, info);
1608 if (edid && (dev->edid != edid))
1612 mutex_unlock(&info->lock);
1617 static int ufx_usb_probe(struct usb_interface *interface,
1618 const struct usb_device_id *id)
1620 struct usb_device *usbdev;
1621 struct ufx_data *dev;
1622 struct fb_info *info = 0;
1623 int retval = -ENOMEM;
1624 u32 id_rev, fpga_rev;
1626 /* usb initialization */
1627 usbdev = interface_to_usbdev(interface);
1630 dev = kzalloc(sizeof(*dev), GFP_KERNEL);
1632 dev_err(&usbdev->dev, "ufx_usb_probe: failed alloc of dev struct\n");
1636 /* we need to wait for both usb and fbdev to spin down on disconnect */
1637 kref_init(&dev->kref); /* matching kref_put in usb .disconnect fn */
1638 kref_get(&dev->kref); /* matching kref_put in free_framebuffer_work */
1641 dev->gdev = &usbdev->dev; /* our generic struct device * */
1642 usb_set_intfdata(interface, dev);
1644 dev_dbg(dev->gdev, "%s %s - serial #%s\n",
1645 usbdev->manufacturer, usbdev->product, usbdev->serial);
1646 dev_dbg(dev->gdev, "vid_%04x&pid_%04x&rev_%04x driver's ufx_data struct at %p\n",
1647 usbdev->descriptor.idVendor, usbdev->descriptor.idProduct,
1648 usbdev->descriptor.bcdDevice, dev);
1649 dev_dbg(dev->gdev, "console enable=%d\n", console);
1650 dev_dbg(dev->gdev, "fb_defio enable=%d\n", fb_defio);
1652 if (!ufx_alloc_urb_list(dev, WRITES_IN_FLIGHT, MAX_TRANSFER)) {
1654 dev_err(dev->gdev, "ufx_alloc_urb_list failed\n");
1658 /* We don't register a new USB class. Our client interface is fbdev */
1660 /* allocates framebuffer driver structure, not framebuffer memory */
1661 info = framebuffer_alloc(0, &usbdev->dev);
1664 dev_err(dev->gdev, "framebuffer_alloc failed\n");
1670 info->pseudo_palette = dev->pseudo_palette;
1671 info->fbops = &ufx_ops;
1673 retval = fb_alloc_cmap(&info->cmap, 256, 0);
1675 dev_err(dev->gdev, "fb_alloc_cmap failed %x\n", retval);
1679 INIT_DELAYED_WORK(&dev->free_framebuffer_work,
1680 ufx_free_framebuffer_work);
1682 INIT_LIST_HEAD(&info->modelist);
1684 retval = ufx_reg_read(dev, 0x3000, &id_rev);
1685 check_warn_goto_error(retval, "error %d reading 0x3000 register from device", retval);
1686 dev_dbg(dev->gdev, "ID_REV register value 0x%08x", id_rev);
1688 retval = ufx_reg_read(dev, 0x3004, &fpga_rev);
1689 check_warn_goto_error(retval, "error %d reading 0x3004 register from device", retval);
1690 dev_dbg(dev->gdev, "FPGA_REV register value 0x%08x", fpga_rev);
1692 dev_dbg(dev->gdev, "resetting device");
1693 retval = ufx_lite_reset(dev);
1694 check_warn_goto_error(retval, "error %d resetting device", retval);
1696 dev_dbg(dev->gdev, "configuring system clock");
1697 retval = ufx_config_sys_clk(dev);
1698 check_warn_goto_error(retval, "error %d configuring system clock", retval);
1700 dev_dbg(dev->gdev, "configuring DDR2 controller");
1701 retval = ufx_config_ddr2(dev);
1702 check_warn_goto_error(retval, "error %d initialising DDR2 controller", retval);
1704 dev_dbg(dev->gdev, "configuring I2C controller");
1705 retval = ufx_i2c_init(dev);
1706 check_warn_goto_error(retval, "error %d initialising I2C controller", retval);
1708 dev_dbg(dev->gdev, "selecting display mode");
1709 retval = ufx_setup_modes(dev, info, NULL, 0);
1710 check_warn_goto_error(retval, "unable to find common mode for display and adapter");
1712 retval = ufx_reg_set_bits(dev, 0x4000, 0x00000001);
1713 check_warn_goto_error(retval, "error %d enabling graphics engine", retval);
1715 /* ready to begin using device */
1716 atomic_set(&dev->usb_active, 1);
1718 dev_dbg(dev->gdev, "checking var");
1719 retval = ufx_ops_check_var(&info->var, info);
1720 check_warn_goto_error(retval, "error %d ufx_ops_check_var", retval);
1722 dev_dbg(dev->gdev, "setting par");
1723 retval = ufx_ops_set_par(info);
1724 check_warn_goto_error(retval, "error %d ufx_ops_set_par", retval);
1726 dev_dbg(dev->gdev, "registering framebuffer");
1727 retval = register_framebuffer(info);
1728 check_warn_goto_error(retval, "error %d register_framebuffer", retval);
1730 dev_info(dev->gdev, "SMSC UDX USB device /dev/fb%d attached. %dx%d resolution."
1731 " Using %dK framebuffer memory\n", info->node,
1732 info->var.xres, info->var.yres, info->fix.smem_len >> 10);
1739 if (info->cmap.len != 0)
1740 fb_dealloc_cmap(&info->cmap);
1741 if (info->monspecs.modedb)
1742 fb_destroy_modedb(info->monspecs.modedb);
1743 if (info->screen_base)
1744 vfree(info->screen_base);
1746 fb_destroy_modelist(&info->modelist);
1748 framebuffer_release(info);
1751 kref_put(&dev->kref, ufx_free); /* ref for framebuffer */
1752 kref_put(&dev->kref, ufx_free); /* last ref from kref_init */
1754 /* dev has been deallocated. Do not dereference */
1760 static void ufx_usb_disconnect(struct usb_interface *interface)
1762 struct ufx_data *dev;
1763 struct fb_info *info;
1765 dev = usb_get_intfdata(interface);
1768 pr_debug("USB disconnect starting\n");
1770 /* we virtualize until all fb clients release. Then we free */
1771 dev->virtualized = true;
1773 /* When non-active we'll update virtual framebuffer, but no new urbs */
1774 atomic_set(&dev->usb_active, 0);
1776 usb_set_intfdata(interface, NULL);
1778 /* if clients still have us open, will be freed on last close */
1779 if (dev->fb_count == 0)
1780 schedule_delayed_work(&dev->free_framebuffer_work, 0);
1782 /* release reference taken by kref_init in probe() */
1783 kref_put(&dev->kref, ufx_free);
1785 /* consider ufx_data freed */
1788 static struct usb_driver ufx_driver = {
1790 .probe = ufx_usb_probe,
1791 .disconnect = ufx_usb_disconnect,
1792 .id_table = id_table,
1795 module_usb_driver(ufx_driver);
1797 static void ufx_urb_completion(struct urb *urb)
1799 struct urb_node *unode = urb->context;
1800 struct ufx_data *dev = unode->dev;
1801 unsigned long flags;
1803 /* sync/async unlink faults aren't errors */
1805 if (!(urb->status == -ENOENT ||
1806 urb->status == -ECONNRESET ||
1807 urb->status == -ESHUTDOWN)) {
1808 pr_err("%s - nonzero write bulk status received: %d\n",
1809 __func__, urb->status);
1810 atomic_set(&dev->lost_pixels, 1);
1814 urb->transfer_buffer_length = dev->urbs.size; /* reset to actual */
1816 spin_lock_irqsave(&dev->urbs.lock, flags);
1817 list_add_tail(&unode->entry, &dev->urbs.list);
1818 dev->urbs.available++;
1819 spin_unlock_irqrestore(&dev->urbs.lock, flags);
1821 /* When using fb_defio, we deadlock if up() is called
1822 * while another is waiting. So queue to another process */
1824 schedule_delayed_work(&unode->release_urb_work, 0);
1826 up(&dev->urbs.limit_sem);
1829 static void ufx_free_urb_list(struct ufx_data *dev)
1831 int count = dev->urbs.count;
1832 struct list_head *node;
1833 struct urb_node *unode;
1836 unsigned long flags;
1838 pr_debug("Waiting for completes and freeing all render urbs\n");
1840 /* keep waiting and freeing, until we've got 'em all */
1842 /* Getting interrupted means a leak, but ok at shutdown*/
1843 ret = down_interruptible(&dev->urbs.limit_sem);
1847 spin_lock_irqsave(&dev->urbs.lock, flags);
1849 node = dev->urbs.list.next; /* have reserved one with sem */
1850 list_del_init(node);
1852 spin_unlock_irqrestore(&dev->urbs.lock, flags);
1854 unode = list_entry(node, struct urb_node, entry);
1857 /* Free each separately allocated piece */
1858 usb_free_coherent(urb->dev, dev->urbs.size,
1859 urb->transfer_buffer, urb->transfer_dma);
1865 static int ufx_alloc_urb_list(struct ufx_data *dev, int count, size_t size)
1869 struct urb_node *unode;
1872 spin_lock_init(&dev->urbs.lock);
1874 dev->urbs.size = size;
1875 INIT_LIST_HEAD(&dev->urbs.list);
1878 unode = kzalloc(sizeof(struct urb_node), GFP_KERNEL);
1883 INIT_DELAYED_WORK(&unode->release_urb_work,
1884 ufx_release_urb_work);
1886 urb = usb_alloc_urb(0, GFP_KERNEL);
1893 buf = usb_alloc_coherent(dev->udev, size, GFP_KERNEL,
1894 &urb->transfer_dma);
1901 /* urb->transfer_buffer_length set to actual before submit */
1902 usb_fill_bulk_urb(urb, dev->udev, usb_sndbulkpipe(dev->udev, 1),
1903 buf, size, ufx_urb_completion, unode);
1904 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;
1906 list_add_tail(&unode->entry, &dev->urbs.list);
1911 sema_init(&dev->urbs.limit_sem, i);
1912 dev->urbs.count = i;
1913 dev->urbs.available = i;
1915 pr_debug("allocated %d %d byte urbs\n", i, (int) size);
1920 static struct urb *ufx_get_urb(struct ufx_data *dev)
1923 struct list_head *entry;
1924 struct urb_node *unode;
1925 struct urb *urb = NULL;
1926 unsigned long flags;
1928 /* Wait for an in-flight buffer to complete and get re-queued */
1929 ret = down_timeout(&dev->urbs.limit_sem, GET_URB_TIMEOUT);
1931 atomic_set(&dev->lost_pixels, 1);
1932 pr_warn("wait for urb interrupted: %x available: %d\n",
1933 ret, dev->urbs.available);
1937 spin_lock_irqsave(&dev->urbs.lock, flags);
1939 BUG_ON(list_empty(&dev->urbs.list)); /* reserved one with limit_sem */
1940 entry = dev->urbs.list.next;
1941 list_del_init(entry);
1942 dev->urbs.available--;
1944 spin_unlock_irqrestore(&dev->urbs.lock, flags);
1946 unode = list_entry(entry, struct urb_node, entry);
1953 static int ufx_submit_urb(struct ufx_data *dev, struct urb *urb, size_t len)
1957 BUG_ON(len > dev->urbs.size);
1959 urb->transfer_buffer_length = len; /* set to actual payload len */
1960 ret = usb_submit_urb(urb, GFP_KERNEL);
1962 ufx_urb_completion(urb); /* because no one else will */
1963 atomic_set(&dev->lost_pixels, 1);
1964 pr_err("usb_submit_urb error %x\n", ret);
1969 module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1970 MODULE_PARM_DESC(console, "Allow fbcon to be used on this display");
1972 module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
1973 MODULE_PARM_DESC(fb_defio, "Enable fb_defio mmap support");
1975 MODULE_AUTHOR("Steve Glendinning <steve.glendinning@smsc.com>");
1976 MODULE_DESCRIPTION("SMSC UFX kernel framebuffer driver");
1977 MODULE_LICENSE("GPL");