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| -rw-r--r-- | Documentation/fb/sh7760fb.txt | 131 |
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diff --git a/Documentation/fb/sh7760fb.txt b/Documentation/fb/sh7760fb.txt deleted file mode 100644 index b994c3b10549..000000000000 --- a/Documentation/fb/sh7760fb.txt +++ /dev/null @@ -1,131 +0,0 @@ -SH7760/SH7763 integrated LCDC Framebuffer driver -================================================ - -0. Overview ------------ -The SH7760/SH7763 have an integrated LCD Display controller (LCDC) which -supports (in theory) resolutions ranging from 1x1 to 1024x1024, -with color depths ranging from 1 to 16 bits, on STN, DSTN and TFT Panels. - -Caveats: -* Framebuffer memory must be a large chunk allocated at the top - of Area3 (HW requirement). Because of this requirement you should NOT - make the driver a module since at runtime it may become impossible to - get a large enough contiguous chunk of memory. - -* The driver does not support changing resolution while loaded - (displays aren't hotpluggable anyway) - -* Heavy flickering may be observed - a) if you're using 15/16bit color modes at >= 640x480 px resolutions, - b) during PCMCIA (or any other slow bus) activity. - -* Rotation works only 90degress clockwise, and only if horizontal - resolution is <= 320 pixels. - -files: drivers/video/sh7760fb.c - include/asm-sh/sh7760fb.h - Documentation/fb/sh7760fb.txt - -1. Platform setup ------------------ -SH7760: - Video data is fetched via the DMABRG DMA engine, so you have to - configure the SH DMAC for DMABRG mode (write 0x94808080 to the - DMARSRA register somewhere at boot). - - PFC registers PCCR and PCDR must be set to peripheral mode. - (write zeros to both). - -The driver does NOT do the above for you since board setup is, well, job -of the board setup code. - -2. Panel definitions --------------------- -The LCDC must explicitly be told about the type of LCD panel -attached. Data must be wrapped in a "struct sh7760fb_platdata" and -passed to the driver as platform_data. - -Suggest you take a closer look at the SH7760 Manual, Section 30. -(http://documentation.renesas.com/eng/products/mpumcu/e602291_sh7760.pdf) - -The following code illustrates what needs to be done to -get the framebuffer working on a 640x480 TFT: - -====================== cut here ====================================== - -#include <linux/fb.h> -#include <asm/sh7760fb.h> - -/* - * NEC NL6440bc26-01 640x480 TFT - * dotclock 25175 kHz - * Xres 640 Yres 480 - * Htotal 800 Vtotal 525 - * HsynStart 656 VsynStart 490 - * HsynLenn 30 VsynLenn 2 - * - * The linux framebuffer layer does not use the syncstart/synclen - * values but right/left/upper/lower margin values. The comments - * for the x_margin explain how to calculate those from given - * panel sync timings. - */ -static struct fb_videomode nl6448bc26 = { - .name = "NL6448BC26", - .refresh = 60, - .xres = 640, - .yres = 480, - .pixclock = 39683, /* in picoseconds! */ - .hsync_len = 30, - .vsync_len = 2, - .left_margin = 114, /* HTOT - (HSYNSLEN + HSYNSTART) */ - .right_margin = 16, /* HSYNSTART - XRES */ - .upper_margin = 33, /* VTOT - (VSYNLEN + VSYNSTART) */ - .lower_margin = 10, /* VSYNSTART - YRES */ - .sync = FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT, - .vmode = FB_VMODE_NONINTERLACED, - .flag = 0, -}; - -static struct sh7760fb_platdata sh7760fb_nl6448 = { - .def_mode = &nl6448bc26, - .ldmtr = LDMTR_TFT_COLOR_16, /* 16bit TFT panel */ - .lddfr = LDDFR_8BPP, /* we want 8bit output */ - .ldpmmr = 0x0070, - .ldpspr = 0x0500, - .ldaclnr = 0, - .ldickr = LDICKR_CLKSRC(LCDC_CLKSRC_EXTERNAL) | - LDICKR_CLKDIV(1), - .rotate = 0, - .novsync = 1, - .blank = NULL, -}; - -/* SH7760: - * 0xFE300800: 256 * 4byte xRGB palette ram - * 0xFE300C00: 42 bytes ctrl registers - */ -static struct resource sh7760_lcdc_res[] = { - [0] = { - .start = 0xFE300800, - .end = 0xFE300CFF, - .flags = IORESOURCE_MEM, - }, - [1] = { - .start = 65, - .end = 65, - .flags = IORESOURCE_IRQ, - }, -}; - -static struct platform_device sh7760_lcdc_dev = { - .dev = { - .platform_data = &sh7760fb_nl6448, - }, - .name = "sh7760-lcdc", - .id = -1, - .resource = sh7760_lcdc_res, - .num_resources = ARRAY_SIZE(sh7760_lcdc_res), -}; - -====================== cut here ====================================== |