This adds support for the VGA/LCD core available from OpenCores: http://opencores.org/project,vga_lcd The driver have been tested together with both OpenRISC and ARM (socfpga) processors. Signed-off-by: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>tirimbino
Stefan Kristiansson
11 years ago
committed by
Tomi Valkeinen
parent
db25295788
commit
e61d05dd88
@ -0,0 +1,440 @@ |
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/*
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* OpenCores VGA/LCD 2.0 core frame buffer driver |
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* |
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* Copyright (C) 2013 Stefan Kristiansson, stefan.kristiansson@saunalahti.fi |
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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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#include <linux/delay.h> |
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#include <linux/dma-mapping.h> |
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#include <linux/errno.h> |
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#include <linux/fb.h> |
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#include <linux/init.h> |
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#include <linux/io.h> |
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#include <linux/kernel.h> |
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#include <linux/mm.h> |
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#include <linux/module.h> |
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#include <linux/of.h> |
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#include <linux/platform_device.h> |
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#include <linux/string.h> |
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#include <linux/slab.h> |
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/* OCFB register defines */ |
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#define OCFB_CTRL 0x000 |
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#define OCFB_STAT 0x004 |
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#define OCFB_HTIM 0x008 |
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#define OCFB_VTIM 0x00c |
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#define OCFB_HVLEN 0x010 |
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#define OCFB_VBARA 0x014 |
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#define OCFB_PALETTE 0x800 |
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#define OCFB_CTRL_VEN 0x00000001 /* Video Enable */ |
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#define OCFB_CTRL_HIE 0x00000002 /* HSync Interrupt Enable */ |
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#define OCFB_CTRL_PC 0x00000800 /* 8-bit Pseudo Color Enable*/ |
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#define OCFB_CTRL_CD8 0x00000000 /* Color Depth 8 */ |
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#define OCFB_CTRL_CD16 0x00000200 /* Color Depth 16 */ |
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#define OCFB_CTRL_CD24 0x00000400 /* Color Depth 24 */ |
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#define OCFB_CTRL_CD32 0x00000600 /* Color Depth 32 */ |
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#define OCFB_CTRL_VBL1 0x00000000 /* Burst Length 1 */ |
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#define OCFB_CTRL_VBL2 0x00000080 /* Burst Length 2 */ |
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#define OCFB_CTRL_VBL4 0x00000100 /* Burst Length 4 */ |
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#define OCFB_CTRL_VBL8 0x00000180 /* Burst Length 8 */ |
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#define PALETTE_SIZE 256 |
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#define OCFB_NAME "OC VGA/LCD" |
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static char *mode_option; |
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static const struct fb_videomode default_mode = { |
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/* 640x480 @ 60 Hz, 31.5 kHz hsync */ |
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NULL, 60, 640, 480, 39721, 40, 24, 32, 11, 96, 2, |
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0, FB_VMODE_NONINTERLACED |
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}; |
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struct ocfb_dev { |
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struct fb_info info; |
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void __iomem *regs; |
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/* flag indicating whether the regs are little endian accessed */ |
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int little_endian; |
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/* Physical and virtual addresses of framebuffer */ |
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phys_addr_t fb_phys; |
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void __iomem *fb_virt; |
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u32 pseudo_palette[PALETTE_SIZE]; |
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}; |
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#ifndef MODULE |
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static int __init ocfb_setup(char *options) |
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{ |
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char *curr_opt; |
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if (!options || !*options) |
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return 0; |
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while ((curr_opt = strsep(&options, ",")) != NULL) { |
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if (!*curr_opt) |
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continue; |
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mode_option = curr_opt; |
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} |
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return 0; |
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} |
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#endif |
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static inline u32 ocfb_readreg(struct ocfb_dev *fbdev, loff_t offset) |
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{ |
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if (fbdev->little_endian) |
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return ioread32(fbdev->regs + offset); |
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else |
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return ioread32be(fbdev->regs + offset); |
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} |
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static void ocfb_writereg(struct ocfb_dev *fbdev, loff_t offset, u32 data) |
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{ |
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if (fbdev->little_endian) |
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iowrite32(data, fbdev->regs + offset); |
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else |
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iowrite32be(data, fbdev->regs + offset); |
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} |
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static int ocfb_setupfb(struct ocfb_dev *fbdev) |
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{ |
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unsigned long bpp_config; |
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struct fb_var_screeninfo *var = &fbdev->info.var; |
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struct device *dev = fbdev->info.device; |
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u32 hlen; |
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u32 vlen; |
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/* Disable display */ |
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ocfb_writereg(fbdev, OCFB_CTRL, 0); |
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/* Register framebuffer address */ |
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fbdev->little_endian = 0; |
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ocfb_writereg(fbdev, OCFB_VBARA, fbdev->fb_phys); |
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/* Detect endianess */ |
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if (ocfb_readreg(fbdev, OCFB_VBARA) != fbdev->fb_phys) { |
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fbdev->little_endian = 1; |
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ocfb_writereg(fbdev, OCFB_VBARA, fbdev->fb_phys); |
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} |
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/* Horizontal timings */ |
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ocfb_writereg(fbdev, OCFB_HTIM, (var->hsync_len - 1) << 24 | |
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(var->right_margin - 1) << 16 | (var->xres - 1)); |
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/* Vertical timings */ |
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ocfb_writereg(fbdev, OCFB_VTIM, (var->vsync_len - 1) << 24 | |
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(var->lower_margin - 1) << 16 | (var->yres - 1)); |
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/* Total length of frame */ |
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hlen = var->left_margin + var->right_margin + var->hsync_len + |
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var->xres; |
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vlen = var->upper_margin + var->lower_margin + var->vsync_len + |
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var->yres; |
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ocfb_writereg(fbdev, OCFB_HVLEN, (hlen - 1) << 16 | (vlen - 1)); |
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bpp_config = OCFB_CTRL_CD8; |
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switch (var->bits_per_pixel) { |
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case 8: |
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if (!var->grayscale) |
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bpp_config |= OCFB_CTRL_PC; /* enable palette */ |
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break; |
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case 16: |
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bpp_config |= OCFB_CTRL_CD16; |
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break; |
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case 24: |
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bpp_config |= OCFB_CTRL_CD24; |
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break; |
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case 32: |
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bpp_config |= OCFB_CTRL_CD32; |
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break; |
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default: |
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dev_err(dev, "no bpp specified\n"); |
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break; |
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} |
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/* maximum (8) VBL (video memory burst length) */ |
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bpp_config |= OCFB_CTRL_VBL8; |
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/* Enable output */ |
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ocfb_writereg(fbdev, OCFB_CTRL, (OCFB_CTRL_VEN | bpp_config)); |
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return 0; |
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} |
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static int ocfb_setcolreg(unsigned regno, unsigned red, unsigned green, |
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unsigned blue, unsigned transp, |
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struct fb_info *info) |
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{ |
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struct ocfb_dev *fbdev = (struct ocfb_dev *)info->par; |
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u32 color; |
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if (regno >= info->cmap.len) { |
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dev_err(info->device, "regno >= cmap.len\n"); |
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return 1; |
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} |
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if (info->var.grayscale) { |
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/* grayscale = 0.30*R + 0.59*G + 0.11*B */ |
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red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8; |
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} |
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red >>= (16 - info->var.red.length); |
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green >>= (16 - info->var.green.length); |
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blue >>= (16 - info->var.blue.length); |
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transp >>= (16 - info->var.transp.length); |
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if (info->var.bits_per_pixel == 8 && !info->var.grayscale) { |
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regno <<= 2; |
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color = (red << 16) | (green << 8) | blue; |
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ocfb_writereg(fbdev, OCFB_PALETTE + regno, color); |
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} else { |
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((u32 *)(info->pseudo_palette))[regno] = |
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(red << info->var.red.offset) | |
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(green << info->var.green.offset) | |
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(blue << info->var.blue.offset) | |
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(transp << info->var.transp.offset); |
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} |
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return 0; |
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} |
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static int ocfb_init_fix(struct ocfb_dev *fbdev) |
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{ |
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struct fb_var_screeninfo *var = &fbdev->info.var; |
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struct fb_fix_screeninfo *fix = &fbdev->info.fix; |
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strcpy(fix->id, OCFB_NAME); |
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fix->line_length = var->xres * var->bits_per_pixel/8; |
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fix->smem_len = fix->line_length * var->yres; |
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fix->type = FB_TYPE_PACKED_PIXELS; |
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if (var->bits_per_pixel == 8 && !var->grayscale) |
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fix->visual = FB_VISUAL_PSEUDOCOLOR; |
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else |
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fix->visual = FB_VISUAL_TRUECOLOR; |
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return 0; |
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} |
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static int ocfb_init_var(struct ocfb_dev *fbdev) |
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{ |
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struct fb_var_screeninfo *var = &fbdev->info.var; |
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var->accel_flags = FB_ACCEL_NONE; |
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var->activate = FB_ACTIVATE_NOW; |
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var->xres_virtual = var->xres; |
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var->yres_virtual = var->yres; |
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switch (var->bits_per_pixel) { |
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case 8: |
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var->transp.offset = 0; |
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var->transp.length = 0; |
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var->red.offset = 0; |
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var->red.length = 8; |
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var->green.offset = 0; |
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var->green.length = 8; |
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var->blue.offset = 0; |
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var->blue.length = 8; |
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break; |
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case 16: |
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var->transp.offset = 0; |
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var->transp.length = 0; |
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var->red.offset = 11; |
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var->red.length = 5; |
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var->green.offset = 5; |
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var->green.length = 6; |
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var->blue.offset = 0; |
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var->blue.length = 5; |
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break; |
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case 24: |
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var->transp.offset = 0; |
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var->transp.length = 0; |
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var->red.offset = 16; |
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var->red.length = 8; |
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var->green.offset = 8; |
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var->green.length = 8; |
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var->blue.offset = 0; |
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var->blue.length = 8; |
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break; |
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case 32: |
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var->transp.offset = 24; |
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var->transp.length = 8; |
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var->red.offset = 16; |
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var->red.length = 8; |
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var->green.offset = 8; |
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var->green.length = 8; |
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var->blue.offset = 0; |
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var->blue.length = 8; |
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break; |
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} |
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return 0; |
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} |
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static struct fb_ops ocfb_ops = { |
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.owner = THIS_MODULE, |
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.fb_setcolreg = ocfb_setcolreg, |
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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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static int ocfb_probe(struct platform_device *pdev) |
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{ |
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int ret = 0; |
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struct ocfb_dev *fbdev; |
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struct resource *res; |
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int fbsize; |
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fbdev = devm_kzalloc(&pdev->dev, sizeof(*fbdev), GFP_KERNEL); |
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if (!fbdev) |
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return -ENOMEM; |
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platform_set_drvdata(pdev, fbdev); |
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fbdev->info.fbops = &ocfb_ops; |
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fbdev->info.device = &pdev->dev; |
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fbdev->info.par = fbdev; |
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/* Video mode setup */ |
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if (!fb_find_mode(&fbdev->info.var, &fbdev->info, mode_option, |
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NULL, 0, &default_mode, 16)) { |
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dev_err(&pdev->dev, "No valid video modes found\n"); |
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return -EINVAL; |
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} |
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ocfb_init_var(fbdev); |
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ocfb_init_fix(fbdev); |
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/* Request I/O resource */ |
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0); |
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if (!res) { |
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dev_err(&pdev->dev, "I/O resource request failed\n"); |
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return -ENXIO; |
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} |
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res->flags &= ~IORESOURCE_CACHEABLE; |
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fbdev->regs = devm_ioremap_resource(&pdev->dev, res); |
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if (IS_ERR(fbdev->regs)) |
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return PTR_ERR(fbdev->regs); |
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/* Allocate framebuffer memory */ |
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fbsize = fbdev->info.fix.smem_len; |
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fbdev->fb_virt = dma_alloc_coherent(&pdev->dev, PAGE_ALIGN(fbsize), |
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&fbdev->fb_phys, GFP_KERNEL); |
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if (!fbdev->fb_virt) { |
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dev_err(&pdev->dev, |
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"Frame buffer memory allocation failed\n"); |
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return -ENOMEM; |
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} |
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fbdev->info.fix.smem_start = fbdev->fb_phys; |
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fbdev->info.screen_base = fbdev->fb_virt; |
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fbdev->info.pseudo_palette = fbdev->pseudo_palette; |
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/* Clear framebuffer */ |
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memset_io(fbdev->fb_virt, 0, fbsize); |
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/* Setup and enable the framebuffer */ |
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ocfb_setupfb(fbdev); |
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if (fbdev->little_endian) |
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fbdev->info.flags |= FBINFO_FOREIGN_ENDIAN; |
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/* Allocate color map */ |
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ret = fb_alloc_cmap(&fbdev->info.cmap, PALETTE_SIZE, 0); |
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if (ret) { |
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dev_err(&pdev->dev, "Color map allocation failed\n"); |
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goto err_dma_free; |
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} |
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/* Register framebuffer */ |
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ret = register_framebuffer(&fbdev->info); |
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if (ret) { |
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dev_err(&pdev->dev, "Framebuffer registration failed\n"); |
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goto err_dealloc_cmap; |
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} |
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return 0; |
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err_dealloc_cmap: |
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fb_dealloc_cmap(&fbdev->info.cmap); |
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err_dma_free: |
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dma_free_coherent(&pdev->dev, PAGE_ALIGN(fbsize), fbdev->fb_virt, |
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fbdev->fb_phys); |
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return ret; |
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} |
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static int ocfb_remove(struct platform_device *pdev) |
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{ |
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struct ocfb_dev *fbdev = platform_get_drvdata(pdev); |
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unregister_framebuffer(&fbdev->info); |
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fb_dealloc_cmap(&fbdev->info.cmap); |
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dma_free_coherent(&pdev->dev, PAGE_ALIGN(fbdev->info.fix.smem_len), |
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fbdev->fb_virt, fbdev->fb_phys); |
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/* Disable display */ |
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ocfb_writereg(fbdev, OCFB_CTRL, 0); |
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platform_set_drvdata(pdev, NULL); |
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return 0; |
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} |
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static struct of_device_id ocfb_match[] = { |
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{ .compatible = "opencores,ocfb", }, |
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{}, |
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}; |
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MODULE_DEVICE_TABLE(of, ocfb_match); |
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static struct platform_driver ocfb_driver = { |
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.probe = ocfb_probe, |
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.remove = ocfb_remove, |
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.driver = { |
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.name = "ocfb_fb", |
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.of_match_table = ocfb_match, |
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} |
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}; |
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/*
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* Init and exit routines |
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*/ |
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static int __init ocfb_init(void) |
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{ |
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#ifndef MODULE |
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char *option = NULL; |
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if (fb_get_options("ocfb", &option)) |
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return -ENODEV; |
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ocfb_setup(option); |
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#endif |
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return platform_driver_register(&ocfb_driver); |
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} |
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static void __exit ocfb_exit(void) |
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{ |
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platform_driver_unregister(&ocfb_driver); |
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} |
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module_init(ocfb_init); |
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module_exit(ocfb_exit); |
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MODULE_AUTHOR("Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>"); |
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MODULE_DESCRIPTION("OpenCores VGA/LCD 2.0 frame buffer driver"); |
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MODULE_LICENSE("GPL v2"); |
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module_param(mode_option, charp, 0); |
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MODULE_PARM_DESC(mode_option, "Video mode ('<xres>x<yres>[-<bpp>][@refresh]')"); |
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