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Linus Torvalds
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Jul 24, 2008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,2 +1,2 @@ | ||
| --- | ||
| refs/heads/master: 1b8ebad87b459e2e1333fbf28005977245ff5402 | ||
| refs/heads/master: b5684b83b1e1579bbbc80e703e990c0cccf5892c |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,24 @@ | ||
| What: /sys/devices/system/memory | ||
| Date: June 2008 | ||
| Contact: Badari Pulavarty <pbadari@us.ibm.com> | ||
| Description: | ||
| The /sys/devices/system/memory contains a snapshot of the | ||
| internal state of the kernel memory blocks. Files could be | ||
| added or removed dynamically to represent hot-add/remove | ||
| operations. | ||
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||
| Users: hotplug memory add/remove tools | ||
| https://w3.opensource.ibm.com/projects/powerpc-utils/ | ||
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| What: /sys/devices/system/memory/memoryX/removable | ||
| Date: June 2008 | ||
| Contact: Badari Pulavarty <pbadari@us.ibm.com> | ||
| Description: | ||
| The file /sys/devices/system/memory/memoryX/removable | ||
| indicates whether this memory block is removable or not. | ||
| This is useful for a user-level agent to determine | ||
| identify removable sections of the memory before attempting | ||
| potentially expensive hot-remove memory operation | ||
|
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| Users: hotplug memory remove tools | ||
| https://w3.opensource.ibm.com/projects/powerpc-utils/ |
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| What: /sys/kernel/mm | ||
| Date: July 2008 | ||
| Contact: Nishanth Aravamudan <nacc@us.ibm.com>, VM maintainers | ||
| Description: | ||
| /sys/kernel/mm/ should contain any and all VM | ||
| related information in /sys/kernel/. |
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| What: /sys/kernel/mm/hugepages/ | ||
| Date: June 2008 | ||
| Contact: Nishanth Aravamudan <nacc@us.ibm.com>, hugetlb maintainers | ||
| Description: | ||
| /sys/kernel/mm/hugepages/ contains a number of subdirectories | ||
| of the form hugepages-<size>kB, where <size> is the page size | ||
| of the hugepages supported by the kernel/CPU combination. | ||
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| Under these directories are a number of files: | ||
| nr_hugepages | ||
| nr_overcommit_hugepages | ||
| free_hugepages | ||
| surplus_hugepages | ||
| resv_hugepages | ||
| See Documentation/vm/hugetlbpage.txt for details. |
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| SH7760/SH7763 integrated LCDC Framebuffer driver | ||
| ================================================ | ||
|
|
||
| 0. Overwiew | ||
| ----------- | ||
| 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. | ||
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||
| 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. | ||
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| * The driver does not support changing resolution while loaded | ||
| (displays aren't hotpluggable anyway) | ||
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| * 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. | ||
|
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| * Rotation works only 90degress clockwise, and only if horizontal | ||
| resolution is <= 320 pixels. | ||
|
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| files: drivers/video/sh7760fb.c | ||
| include/asm-sh/sh7760fb.h | ||
| Documentation/fb/sh7760fb.txt | ||
|
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||
| 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). | ||
|
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| PFC registers PCCR and PCDR must be set to peripheral mode. | ||
| (write zeros to both). | ||
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| The driver does NOT do the above for you since board setup is, well, job | ||
| of the board setup code. | ||
|
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||
| 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. | ||
|
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||
| Suggest you take a closer look at the SH7760 Manual, Section 30. | ||
| (http://documentation.renesas.com/eng/products/mpumcu/e602291_sh7760.pdf) | ||
|
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| The following code illustrates what needs to be done to | ||
| get the framebuffer working on a 640x480 TFT: | ||
|
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||
| ====================== cut here ====================================== | ||
|
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| #include <linux/fb.h> | ||
| #include <asm/sh7760fb.h> | ||
|
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||
| /* | ||
| * 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, | ||
| }; | ||
|
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| 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, | ||
| }, | ||
| }; | ||
|
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| 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 ====================================== |
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