509 lines
14 KiB
C
509 lines
14 KiB
C
/*
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* Xilinx TFT frame buffer driver
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*
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* Author: MontaVista Software, Inc.
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* source@mvista.com
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*
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* 2002-2007 (c) MontaVista Software, Inc.
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* 2007 (c) Secret Lab Technologies, Ltd.
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* 2009 (c) Xilinx Inc.
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*
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* This file is licensed under the terms of the GNU General Public License
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* version 2. This program is licensed "as is" without any warranty of any
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* kind, whether express or implied.
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*/
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/*
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* This driver was based on au1100fb.c by MontaVista rewritten for 2.6
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* by Embedded Alley Solutions <source@embeddedalley.com>, which in turn
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* was based on skeletonfb.c, Skeleton for a frame buffer device by
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* Geert Uytterhoeven.
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*/
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#include <linux/device.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/string.h>
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#include <linux/mm.h>
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#include <linux/fb.h>
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#include <linux/init.h>
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#include <linux/dma-mapping.h>
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#include <linux/of_device.h>
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#include <linux/of_platform.h>
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#include <linux/of_address.h>
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#include <linux/io.h>
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#include <linux/slab.h>
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#ifdef CONFIG_PPC_DCR
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#include <asm/dcr.h>
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#endif
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#define DRIVER_NAME "xilinxfb"
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/*
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* Xilinx calls it "TFT LCD Controller" though it can also be used for
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* the VGA port on the Xilinx ML40x board. This is a hardware display
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* controller for a 640x480 resolution TFT or VGA screen.
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*
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* The interface to the framebuffer is nice and simple. There are two
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* control registers. The first tells the LCD interface where in memory
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* the frame buffer is (only the 11 most significant bits are used, so
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* don't start thinking about scrolling). The second allows the LCD to
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* be turned on or off as well as rotated 180 degrees.
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*
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* In case of direct BUS access the second control register will be at
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* an offset of 4 as compared to the DCR access where the offset is 1
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* i.e. REG_CTRL. So this is taken care in the function
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* xilinx_fb_out32 where it left shifts the offset 2 times in case of
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* direct BUS access.
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*/
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#define NUM_REGS 2
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#define REG_FB_ADDR 0
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#define REG_CTRL 1
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#define REG_CTRL_ENABLE 0x0001
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#define REG_CTRL_ROTATE 0x0002
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/*
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* The hardware only handles a single mode: 640x480 24 bit true
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* color. Each pixel gets a word (32 bits) of memory. Within each word,
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* the 8 most significant bits are ignored, the next 8 bits are the red
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* level, the next 8 bits are the green level and the 8 least
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* significant bits are the blue level. Each row of the LCD uses 1024
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* words, but only the first 640 pixels are displayed with the other 384
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* words being ignored. There are 480 rows.
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*/
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#define BYTES_PER_PIXEL 4
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#define BITS_PER_PIXEL (BYTES_PER_PIXEL * 8)
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#define RED_SHIFT 16
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#define GREEN_SHIFT 8
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#define BLUE_SHIFT 0
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#define PALETTE_ENTRIES_NO 16 /* passed to fb_alloc_cmap() */
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/* ML300/403 reference design framebuffer driver platform data struct */
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struct xilinxfb_platform_data {
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u32 rotate_screen; /* Flag to rotate display 180 degrees */
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u32 screen_height_mm; /* Physical dimensions of screen in mm */
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u32 screen_width_mm;
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u32 xres, yres; /* resolution of screen in pixels */
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u32 xvirt, yvirt; /* resolution of memory buffer */
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/* Physical address of framebuffer memory; If non-zero, driver
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* will use provided memory address instead of allocating one from
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* the consistent pool. */
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u32 fb_phys;
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};
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/*
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* Default xilinxfb configuration
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*/
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static struct xilinxfb_platform_data xilinx_fb_default_pdata = {
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.xres = 640,
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.yres = 480,
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.xvirt = 1024,
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.yvirt = 480,
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};
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/*
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* Here are the default fb_fix_screeninfo and fb_var_screeninfo structures
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*/
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static struct fb_fix_screeninfo xilinx_fb_fix = {
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.id = "Xilinx",
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_TRUECOLOR,
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.accel = FB_ACCEL_NONE
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};
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static struct fb_var_screeninfo xilinx_fb_var = {
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.bits_per_pixel = BITS_PER_PIXEL,
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.red = { RED_SHIFT, 8, 0 },
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.green = { GREEN_SHIFT, 8, 0 },
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.blue = { BLUE_SHIFT, 8, 0 },
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.transp = { 0, 0, 0 },
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.activate = FB_ACTIVATE_NOW
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};
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#define BUS_ACCESS_FLAG 0x1 /* 1 = BUS, 0 = DCR */
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#define LITTLE_ENDIAN_ACCESS 0x2 /* LITTLE ENDIAN IO functions */
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struct xilinxfb_drvdata {
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struct fb_info info; /* FB driver info record */
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phys_addr_t regs_phys; /* phys. address of the control
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registers */
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void __iomem *regs; /* virt. address of the control
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registers */
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#ifdef CONFIG_PPC_DCR
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dcr_host_t dcr_host;
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unsigned int dcr_len;
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#endif
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void *fb_virt; /* virt. address of the frame buffer */
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dma_addr_t fb_phys; /* phys. address of the frame buffer */
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int fb_alloced; /* Flag, was the fb memory alloced? */
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u8 flags; /* features of the driver */
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u32 reg_ctrl_default;
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u32 pseudo_palette[PALETTE_ENTRIES_NO];
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/* Fake palette of 16 colors */
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};
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#define to_xilinxfb_drvdata(_info) \
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container_of(_info, struct xilinxfb_drvdata, info)
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/*
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* The XPS TFT Controller can be accessed through BUS or DCR interface.
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* To perform the read/write on the registers we need to check on
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* which bus its connected and call the appropriate write API.
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*/
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static void xilinx_fb_out32(struct xilinxfb_drvdata *drvdata, u32 offset,
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u32 val)
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{
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if (drvdata->flags & BUS_ACCESS_FLAG) {
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if (drvdata->flags & LITTLE_ENDIAN_ACCESS)
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iowrite32(val, drvdata->regs + (offset << 2));
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else
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iowrite32be(val, drvdata->regs + (offset << 2));
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}
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#ifdef CONFIG_PPC_DCR
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else
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dcr_write(drvdata->dcr_host, offset, val);
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#endif
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}
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static u32 xilinx_fb_in32(struct xilinxfb_drvdata *drvdata, u32 offset)
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{
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if (drvdata->flags & BUS_ACCESS_FLAG) {
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if (drvdata->flags & LITTLE_ENDIAN_ACCESS)
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return ioread32(drvdata->regs + (offset << 2));
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else
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return ioread32be(drvdata->regs + (offset << 2));
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}
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#ifdef CONFIG_PPC_DCR
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else
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return dcr_read(drvdata->dcr_host, offset);
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#endif
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return 0;
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}
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static int
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xilinx_fb_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue,
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unsigned transp, struct fb_info *fbi)
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{
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u32 *palette = fbi->pseudo_palette;
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if (regno >= PALETTE_ENTRIES_NO)
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return -EINVAL;
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if (fbi->var.grayscale) {
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/* Convert color to grayscale.
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* grayscale = 0.30*R + 0.59*G + 0.11*B */
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red = green = blue =
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(red * 77 + green * 151 + blue * 28 + 127) >> 8;
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}
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/* fbi->fix.visual is always FB_VISUAL_TRUECOLOR */
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/* We only handle 8 bits of each color. */
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red >>= 8;
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green >>= 8;
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blue >>= 8;
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palette[regno] = (red << RED_SHIFT) | (green << GREEN_SHIFT) |
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(blue << BLUE_SHIFT);
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return 0;
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}
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static int
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xilinx_fb_blank(int blank_mode, struct fb_info *fbi)
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{
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struct xilinxfb_drvdata *drvdata = to_xilinxfb_drvdata(fbi);
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switch (blank_mode) {
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case FB_BLANK_UNBLANK:
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/* turn on panel */
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xilinx_fb_out32(drvdata, REG_CTRL, drvdata->reg_ctrl_default);
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break;
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case FB_BLANK_NORMAL:
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case FB_BLANK_VSYNC_SUSPEND:
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case FB_BLANK_HSYNC_SUSPEND:
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case FB_BLANK_POWERDOWN:
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/* turn off panel */
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xilinx_fb_out32(drvdata, REG_CTRL, 0);
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default:
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break;
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}
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return 0; /* success */
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}
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static struct fb_ops xilinxfb_ops =
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{
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.owner = THIS_MODULE,
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.fb_setcolreg = xilinx_fb_setcolreg,
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.fb_blank = xilinx_fb_blank,
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.fb_fillrect = cfb_fillrect,
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.fb_copyarea = cfb_copyarea,
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.fb_imageblit = cfb_imageblit,
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};
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/* ---------------------------------------------------------------------
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* Bus independent setup/teardown
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*/
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static int xilinxfb_assign(struct platform_device *pdev,
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struct xilinxfb_drvdata *drvdata,
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struct xilinxfb_platform_data *pdata)
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{
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int rc;
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struct device *dev = &pdev->dev;
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int fbsize = pdata->xvirt * pdata->yvirt * BYTES_PER_PIXEL;
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if (drvdata->flags & BUS_ACCESS_FLAG) {
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struct resource *res;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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drvdata->regs = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(drvdata->regs))
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return PTR_ERR(drvdata->regs);
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drvdata->regs_phys = res->start;
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}
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/* Allocate the framebuffer memory */
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if (pdata->fb_phys) {
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drvdata->fb_phys = pdata->fb_phys;
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drvdata->fb_virt = ioremap(pdata->fb_phys, fbsize);
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} else {
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drvdata->fb_alloced = 1;
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drvdata->fb_virt = dma_alloc_coherent(dev, PAGE_ALIGN(fbsize),
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&drvdata->fb_phys, GFP_KERNEL);
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}
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if (!drvdata->fb_virt) {
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dev_err(dev, "Could not allocate frame buffer memory\n");
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return -ENOMEM;
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}
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/* Clear (turn to black) the framebuffer */
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memset_io((void __iomem *)drvdata->fb_virt, 0, fbsize);
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/* Tell the hardware where the frame buffer is */
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xilinx_fb_out32(drvdata, REG_FB_ADDR, drvdata->fb_phys);
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rc = xilinx_fb_in32(drvdata, REG_FB_ADDR);
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/* Endianess detection */
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if (rc != drvdata->fb_phys) {
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drvdata->flags |= LITTLE_ENDIAN_ACCESS;
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xilinx_fb_out32(drvdata, REG_FB_ADDR, drvdata->fb_phys);
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}
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/* Turn on the display */
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drvdata->reg_ctrl_default = REG_CTRL_ENABLE;
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if (pdata->rotate_screen)
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drvdata->reg_ctrl_default |= REG_CTRL_ROTATE;
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xilinx_fb_out32(drvdata, REG_CTRL,
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drvdata->reg_ctrl_default);
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/* Fill struct fb_info */
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drvdata->info.device = dev;
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drvdata->info.screen_base = (void __iomem *)drvdata->fb_virt;
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drvdata->info.fbops = &xilinxfb_ops;
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drvdata->info.fix = xilinx_fb_fix;
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drvdata->info.fix.smem_start = drvdata->fb_phys;
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drvdata->info.fix.smem_len = fbsize;
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drvdata->info.fix.line_length = pdata->xvirt * BYTES_PER_PIXEL;
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drvdata->info.pseudo_palette = drvdata->pseudo_palette;
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drvdata->info.flags = FBINFO_DEFAULT;
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drvdata->info.var = xilinx_fb_var;
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drvdata->info.var.height = pdata->screen_height_mm;
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drvdata->info.var.width = pdata->screen_width_mm;
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drvdata->info.var.xres = pdata->xres;
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drvdata->info.var.yres = pdata->yres;
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drvdata->info.var.xres_virtual = pdata->xvirt;
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drvdata->info.var.yres_virtual = pdata->yvirt;
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/* Allocate a colour map */
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rc = fb_alloc_cmap(&drvdata->info.cmap, PALETTE_ENTRIES_NO, 0);
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if (rc) {
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dev_err(dev, "Fail to allocate colormap (%d entries)\n",
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PALETTE_ENTRIES_NO);
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goto err_cmap;
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}
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/* Register new frame buffer */
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rc = register_framebuffer(&drvdata->info);
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if (rc) {
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dev_err(dev, "Could not register frame buffer\n");
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goto err_regfb;
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}
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if (drvdata->flags & BUS_ACCESS_FLAG) {
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/* Put a banner in the log (for DEBUG) */
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dev_dbg(dev, "regs: phys=%pa, virt=%p\n",
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&drvdata->regs_phys, drvdata->regs);
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}
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/* Put a banner in the log (for DEBUG) */
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dev_dbg(dev, "fb: phys=%llx, virt=%p, size=%x\n",
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(unsigned long long)drvdata->fb_phys, drvdata->fb_virt, fbsize);
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return 0; /* success */
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err_regfb:
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fb_dealloc_cmap(&drvdata->info.cmap);
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err_cmap:
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if (drvdata->fb_alloced)
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dma_free_coherent(dev, PAGE_ALIGN(fbsize), drvdata->fb_virt,
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drvdata->fb_phys);
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else
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iounmap(drvdata->fb_virt);
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/* Turn off the display */
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xilinx_fb_out32(drvdata, REG_CTRL, 0);
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return rc;
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}
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static int xilinxfb_release(struct device *dev)
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{
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struct xilinxfb_drvdata *drvdata = dev_get_drvdata(dev);
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#if !defined(CONFIG_FRAMEBUFFER_CONSOLE) && defined(CONFIG_LOGO)
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xilinx_fb_blank(VESA_POWERDOWN, &drvdata->info);
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#endif
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unregister_framebuffer(&drvdata->info);
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fb_dealloc_cmap(&drvdata->info.cmap);
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if (drvdata->fb_alloced)
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dma_free_coherent(dev, PAGE_ALIGN(drvdata->info.fix.smem_len),
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drvdata->fb_virt, drvdata->fb_phys);
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else
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iounmap(drvdata->fb_virt);
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/* Turn off the display */
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xilinx_fb_out32(drvdata, REG_CTRL, 0);
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#ifdef CONFIG_PPC_DCR
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/* Release the resources, as allocated based on interface */
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if (!(drvdata->flags & BUS_ACCESS_FLAG))
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dcr_unmap(drvdata->dcr_host, drvdata->dcr_len);
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#endif
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return 0;
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}
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/* ---------------------------------------------------------------------
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* OF bus binding
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*/
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static int xilinxfb_of_probe(struct platform_device *pdev)
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{
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const u32 *prop;
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u32 tft_access = 0;
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struct xilinxfb_platform_data pdata;
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int size;
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struct xilinxfb_drvdata *drvdata;
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/* Copy with the default pdata (not a ptr reference!) */
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pdata = xilinx_fb_default_pdata;
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/* Allocate the driver data region */
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drvdata = devm_kzalloc(&pdev->dev, sizeof(*drvdata), GFP_KERNEL);
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if (!drvdata)
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return -ENOMEM;
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/*
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* To check whether the core is connected directly to DCR or BUS
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* interface and initialize the tft_access accordingly.
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*/
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of_property_read_u32(pdev->dev.of_node, "xlnx,dcr-splb-slave-if",
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&tft_access);
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/*
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* Fill the resource structure if its direct BUS interface
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* otherwise fill the dcr_host structure.
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*/
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if (tft_access) {
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drvdata->flags |= BUS_ACCESS_FLAG;
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}
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#ifdef CONFIG_PPC_DCR
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else {
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int start;
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start = dcr_resource_start(pdev->dev.of_node, 0);
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drvdata->dcr_len = dcr_resource_len(pdev->dev.of_node, 0);
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drvdata->dcr_host = dcr_map(pdev->dev.of_node, start, drvdata->dcr_len);
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if (!DCR_MAP_OK(drvdata->dcr_host)) {
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dev_err(&pdev->dev, "invalid DCR address\n");
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return -ENODEV;
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}
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}
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#endif
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prop = of_get_property(pdev->dev.of_node, "phys-size", &size);
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if ((prop) && (size >= sizeof(u32)*2)) {
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pdata.screen_width_mm = prop[0];
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pdata.screen_height_mm = prop[1];
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}
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prop = of_get_property(pdev->dev.of_node, "resolution", &size);
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if ((prop) && (size >= sizeof(u32)*2)) {
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pdata.xres = prop[0];
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pdata.yres = prop[1];
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}
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prop = of_get_property(pdev->dev.of_node, "virtual-resolution", &size);
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if ((prop) && (size >= sizeof(u32)*2)) {
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pdata.xvirt = prop[0];
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pdata.yvirt = prop[1];
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}
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if (of_find_property(pdev->dev.of_node, "rotate-display", NULL))
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pdata.rotate_screen = 1;
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dev_set_drvdata(&pdev->dev, drvdata);
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return xilinxfb_assign(pdev, drvdata, &pdata);
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}
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static int xilinxfb_of_remove(struct platform_device *op)
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{
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return xilinxfb_release(&op->dev);
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}
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/* Match table for of_platform binding */
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static struct of_device_id xilinxfb_of_match[] = {
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{ .compatible = "xlnx,xps-tft-1.00.a", },
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{ .compatible = "xlnx,xps-tft-2.00.a", },
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{ .compatible = "xlnx,xps-tft-2.01.a", },
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{ .compatible = "xlnx,plb-tft-cntlr-ref-1.00.a", },
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{ .compatible = "xlnx,plb-dvi-cntlr-ref-1.00.c", },
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, xilinxfb_of_match);
|
|
|
|
static struct platform_driver xilinxfb_of_driver = {
|
|
.probe = xilinxfb_of_probe,
|
|
.remove = xilinxfb_of_remove,
|
|
.driver = {
|
|
.name = DRIVER_NAME,
|
|
.of_match_table = xilinxfb_of_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(xilinxfb_of_driver);
|
|
|
|
MODULE_AUTHOR("MontaVista Software, Inc. <source@mvista.com>");
|
|
MODULE_DESCRIPTION("Xilinx TFT frame buffer driver");
|
|
MODULE_LICENSE("GPL");
|