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1 | SH7760/SH7763 integrated LCDC Framebuffer driver |
2 | ================================================ |
3 | |
4 | 0. Overview |
5 | ----------- |
6 | The SH7760/SH7763 have an integrated LCD Display controller (LCDC) which |
7 | supports (in theory) resolutions ranging from 1x1 to 1024x1024, |
8 | with color depths ranging from 1 to 16 bits, on STN, DSTN and TFT Panels. |
9 | |
10 | Caveats: |
11 | * Framebuffer memory must be a large chunk allocated at the top |
12 | of Area3 (HW requirement). Because of this requirement you should NOT |
13 | make the driver a module since at runtime it may become impossible to |
14 | get a large enough contiguous chunk of memory. |
15 | |
16 | * The driver does not support changing resolution while loaded |
17 | (displays aren't hotpluggable anyway) |
18 | |
19 | * Heavy flickering may be observed |
20 | a) if you're using 15/16bit color modes at >= 640x480 px resolutions, |
21 | b) during PCMCIA (or any other slow bus) activity. |
22 | |
23 | * Rotation works only 90degress clockwise, and only if horizontal |
24 | resolution is <= 320 pixels. |
25 | |
26 | files: drivers/video/sh7760fb.c |
27 | include/asm-sh/sh7760fb.h |
28 | Documentation/fb/sh7760fb.txt |
29 | |
30 | 1. Platform setup |
31 | ----------------- |
32 | SH7760: |
33 | Video data is fetched via the DMABRG DMA engine, so you have to |
34 | configure the SH DMAC for DMABRG mode (write 0x94808080 to the |
35 | DMARSRA register somewhere at boot). |
36 | |
37 | PFC registers PCCR and PCDR must be set to peripheral mode. |
38 | (write zeros to both). |
39 | |
40 | The driver does NOT do the above for you since board setup is, well, job |
41 | of the board setup code. |
42 | |
43 | 2. Panel definitions |
44 | -------------------- |
45 | The LCDC must explicitly be told about the type of LCD panel |
46 | attached. Data must be wrapped in a "struct sh7760fb_platdata" and |
47 | passed to the driver as platform_data. |
48 | |
49 | Suggest you take a closer look at the SH7760 Manual, Section 30. |
50 | (http://documentation.renesas.com/eng/products/mpumcu/e602291_sh7760.pdf) |
51 | |
52 | The following code illustrates what needs to be done to |
53 | get the framebuffer working on a 640x480 TFT: |
54 | |
55 | ====================== cut here ====================================== |
56 | |
57 | #include <linux/fb.h> |
58 | #include <asm/sh7760fb.h> |
59 | |
60 | /* |
61 | * NEC NL6440bc26-01 640x480 TFT |
62 | * dotclock 25175 kHz |
63 | * Xres 640 Yres 480 |
64 | * Htotal 800 Vtotal 525 |
65 | * HsynStart 656 VsynStart 490 |
66 | * HsynLenn 30 VsynLenn 2 |
67 | * |
68 | * The linux framebuffer layer does not use the syncstart/synclen |
69 | * values but right/left/upper/lower margin values. The comments |
70 | * for the x_margin explain how to calculate those from given |
71 | * panel sync timings. |
72 | */ |
73 | static struct fb_videomode nl6448bc26 = { |
74 | .name = "NL6448BC26", |
75 | .refresh = 60, |
76 | .xres = 640, |
77 | .yres = 480, |
78 | .pixclock = 39683, /* in picoseconds! */ |
79 | .hsync_len = 30, |
80 | .vsync_len = 2, |
81 | .left_margin = 114, /* HTOT - (HSYNSLEN + HSYNSTART) */ |
82 | .right_margin = 16, /* HSYNSTART - XRES */ |
83 | .upper_margin = 33, /* VTOT - (VSYNLEN + VSYNSTART) */ |
84 | .lower_margin = 10, /* VSYNSTART - YRES */ |
85 | .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, |
86 | .vmode = FB_VMODE_NONINTERLACED, |
87 | .flag = 0, |
88 | }; |
89 | |
90 | static struct sh7760fb_platdata sh7760fb_nl6448 = { |
91 | .def_mode = &nl6448bc26, |
92 | .ldmtr = LDMTR_TFT_COLOR_16, /* 16bit TFT panel */ |
93 | .lddfr = LDDFR_8BPP, /* we want 8bit output */ |
94 | .ldpmmr = 0x0070, |
95 | .ldpspr = 0x0500, |
96 | .ldaclnr = 0, |
97 | .ldickr = LDICKR_CLKSRC(LCDC_CLKSRC_EXTERNAL) | |
98 | LDICKR_CLKDIV(1), |
99 | .rotate = 0, |
100 | .novsync = 1, |
101 | .blank = NULL, |
102 | }; |
103 | |
104 | /* SH7760: |
105 | * 0xFE300800: 256 * 4byte xRGB palette ram |
106 | * 0xFE300C00: 42 bytes ctrl registers |
107 | */ |
108 | static struct resource sh7760_lcdc_res[] = { |
109 | [0] = { |
110 | .start = 0xFE300800, |
111 | .end = 0xFE300CFF, |
112 | .flags = IORESOURCE_MEM, |
113 | }, |
114 | [1] = { |
115 | .start = 65, |
116 | .end = 65, |
117 | .flags = IORESOURCE_IRQ, |
118 | }, |
119 | }; |
120 | |
121 | static struct platform_device sh7760_lcdc_dev = { |
122 | .dev = { |
123 | .platform_data = &sh7760fb_nl6448, |
124 | }, |
125 | .name = "sh7760-lcdc", |
126 | .id = -1, |
127 | .resource = sh7760_lcdc_res, |
128 | .num_resources = ARRAY_SIZE(sh7760_lcdc_res), |
129 | }; |
130 | |
131 | ====================== cut here ====================================== |
132 |
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