556 lines
14 KiB
C
556 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Driver for Aeroflex Gaisler SVGACTRL framebuffer device.
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*
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* 2011 (c) Aeroflex Gaisler AB
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*
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* Full documentation of the core can be found here:
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* https://www.gaisler.com/products/grlib/grip.pdf
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*
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* Contributors: Kristoffer Glembo <kristoffer@gaisler.com>
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*/
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#include <linux/platform_device.h>
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#include <linux/dma-mapping.h>
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#include <linux/of_platform.h>
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#include <linux/of_device.h>
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/delay.h>
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#include <linux/errno.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/mm.h>
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#include <linux/fb.h>
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#include <linux/io.h>
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struct grvga_regs {
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u32 status; /* 0x00 */
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u32 video_length; /* 0x04 */
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u32 front_porch; /* 0x08 */
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u32 sync_length; /* 0x0C */
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u32 line_length; /* 0x10 */
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u32 fb_pos; /* 0x14 */
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u32 clk_vector[4]; /* 0x18 */
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u32 clut; /* 0x20 */
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};
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struct grvga_par {
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struct grvga_regs *regs;
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u32 color_palette[16]; /* 16 entry pseudo palette used by fbcon in true color mode */
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int clk_sel;
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int fb_alloced; /* = 1 if framebuffer is allocated in main memory */
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};
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static const struct fb_videomode grvga_modedb[] = {
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{
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/* 640x480 @ 60 Hz */
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NULL, 60, 640, 480, 40000, 48, 16, 39, 11, 96, 2,
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0, FB_VMODE_NONINTERLACED
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}, {
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/* 800x600 @ 60 Hz */
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NULL, 60, 800, 600, 25000, 88, 40, 23, 1, 128, 4,
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0, FB_VMODE_NONINTERLACED
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}, {
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/* 800x600 @ 72 Hz */
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NULL, 72, 800, 600, 20000, 64, 56, 23, 37, 120, 6,
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0, FB_VMODE_NONINTERLACED
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}, {
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/* 1024x768 @ 60 Hz */
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NULL, 60, 1024, 768, 15385, 160, 24, 29, 3, 136, 6,
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0, FB_VMODE_NONINTERLACED
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}
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};
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static const struct fb_fix_screeninfo grvga_fix = {
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.id = "AG SVGACTRL",
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.type = FB_TYPE_PACKED_PIXELS,
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.visual = FB_VISUAL_PSEUDOCOLOR,
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.xpanstep = 0,
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.ypanstep = 1,
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.ywrapstep = 0,
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.accel = FB_ACCEL_NONE,
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};
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static int grvga_check_var(struct fb_var_screeninfo *var,
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struct fb_info *info)
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{
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struct grvga_par *par = info->par;
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int i;
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if (!var->xres)
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var->xres = 1;
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if (!var->yres)
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var->yres = 1;
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if (var->bits_per_pixel <= 8)
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var->bits_per_pixel = 8;
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else if (var->bits_per_pixel <= 16)
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var->bits_per_pixel = 16;
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else if (var->bits_per_pixel <= 24)
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var->bits_per_pixel = 24;
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else if (var->bits_per_pixel <= 32)
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var->bits_per_pixel = 32;
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else
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return -EINVAL;
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var->xres_virtual = var->xres;
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var->yres_virtual = 2*var->yres;
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if (info->fix.smem_len) {
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if ((var->yres_virtual*var->xres_virtual*var->bits_per_pixel/8) > info->fix.smem_len)
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return -ENOMEM;
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}
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/* Which clocks that are available can be read out in these registers */
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for (i = 0; i <= 3 ; i++) {
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if (var->pixclock == par->regs->clk_vector[i])
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break;
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}
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if (i <= 3)
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par->clk_sel = i;
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else
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return -EINVAL;
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switch (info->var.bits_per_pixel) {
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case 8:
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var->red = (struct fb_bitfield) {0, 8, 0}; /* offset, length, msb-right */
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var->green = (struct fb_bitfield) {0, 8, 0};
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var->blue = (struct fb_bitfield) {0, 8, 0};
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var->transp = (struct fb_bitfield) {0, 0, 0};
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break;
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case 16:
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var->red = (struct fb_bitfield) {11, 5, 0};
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var->green = (struct fb_bitfield) {5, 6, 0};
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var->blue = (struct fb_bitfield) {0, 5, 0};
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var->transp = (struct fb_bitfield) {0, 0, 0};
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break;
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case 24:
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case 32:
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var->red = (struct fb_bitfield) {16, 8, 0};
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var->green = (struct fb_bitfield) {8, 8, 0};
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var->blue = (struct fb_bitfield) {0, 8, 0};
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var->transp = (struct fb_bitfield) {24, 8, 0};
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int grvga_set_par(struct fb_info *info)
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{
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u32 func = 0;
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struct grvga_par *par = info->par;
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__raw_writel(((info->var.yres - 1) << 16) | (info->var.xres - 1),
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&par->regs->video_length);
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__raw_writel((info->var.lower_margin << 16) | (info->var.right_margin),
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&par->regs->front_porch);
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__raw_writel((info->var.vsync_len << 16) | (info->var.hsync_len),
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&par->regs->sync_length);
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__raw_writel(((info->var.yres + info->var.lower_margin + info->var.upper_margin + info->var.vsync_len - 1) << 16) |
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(info->var.xres + info->var.right_margin + info->var.left_margin + info->var.hsync_len - 1),
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&par->regs->line_length);
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switch (info->var.bits_per_pixel) {
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case 8:
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info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
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func = 1;
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break;
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case 16:
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info->fix.visual = FB_VISUAL_TRUECOLOR;
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func = 2;
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break;
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case 24:
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case 32:
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info->fix.visual = FB_VISUAL_TRUECOLOR;
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func = 3;
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break;
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default:
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return -EINVAL;
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}
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__raw_writel((par->clk_sel << 6) | (func << 4) | 1,
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&par->regs->status);
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info->fix.line_length = (info->var.xres_virtual*info->var.bits_per_pixel)/8;
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return 0;
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}
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static int grvga_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *info)
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{
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struct grvga_par *par;
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par = info->par;
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if (regno >= 256) /* Size of CLUT */
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return -EINVAL;
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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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#define CNVT_TOHW(val, width) ((((val)<<(width))+0x7FFF-(val))>>16)
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red = CNVT_TOHW(red, info->var.red.length);
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green = CNVT_TOHW(green, info->var.green.length);
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blue = CNVT_TOHW(blue, info->var.blue.length);
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transp = CNVT_TOHW(transp, info->var.transp.length);
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#undef CNVT_TOHW
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/* In PSEUDOCOLOR we use the hardware CLUT */
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if (info->fix.visual == FB_VISUAL_PSEUDOCOLOR)
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__raw_writel((regno << 24) | (red << 16) | (green << 8) | blue,
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&par->regs->clut);
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/* Truecolor uses the pseudo palette */
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else if (info->fix.visual == FB_VISUAL_TRUECOLOR) {
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u32 v;
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if (regno >= 16)
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return -EINVAL;
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v = (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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((u32 *) (info->pseudo_palette))[regno] = v;
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}
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return 0;
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}
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static int grvga_pan_display(struct fb_var_screeninfo *var,
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struct fb_info *info)
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{
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struct grvga_par *par = info->par;
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struct fb_fix_screeninfo *fix = &info->fix;
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u32 base_addr;
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if (var->xoffset != 0)
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return -EINVAL;
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base_addr = fix->smem_start + (var->yoffset * fix->line_length);
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base_addr &= ~3UL;
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/* Set framebuffer base address */
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__raw_writel(base_addr,
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&par->regs->fb_pos);
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return 0;
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}
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static const struct fb_ops grvga_ops = {
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.owner = THIS_MODULE,
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.fb_check_var = grvga_check_var,
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.fb_set_par = grvga_set_par,
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.fb_setcolreg = grvga_setcolreg,
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.fb_pan_display = grvga_pan_display,
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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 grvga_parse_custom(char *options,
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struct fb_var_screeninfo *screendata)
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{
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char *this_opt;
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int count = 0;
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if (!options || !*options)
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return -1;
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while ((this_opt = strsep(&options, " ")) != NULL) {
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if (!*this_opt)
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continue;
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switch (count) {
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case 0:
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screendata->pixclock = simple_strtoul(this_opt, NULL, 0);
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count++;
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break;
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case 1:
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screendata->xres = screendata->xres_virtual = simple_strtoul(this_opt, NULL, 0);
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count++;
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break;
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case 2:
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screendata->right_margin = simple_strtoul(this_opt, NULL, 0);
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count++;
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break;
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case 3:
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screendata->hsync_len = simple_strtoul(this_opt, NULL, 0);
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count++;
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break;
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case 4:
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screendata->left_margin = simple_strtoul(this_opt, NULL, 0);
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count++;
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break;
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case 5:
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screendata->yres = screendata->yres_virtual = simple_strtoul(this_opt, NULL, 0);
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count++;
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break;
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case 6:
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screendata->lower_margin = simple_strtoul(this_opt, NULL, 0);
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count++;
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break;
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case 7:
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screendata->vsync_len = simple_strtoul(this_opt, NULL, 0);
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count++;
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break;
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case 8:
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screendata->upper_margin = simple_strtoul(this_opt, NULL, 0);
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count++;
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break;
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case 9:
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screendata->bits_per_pixel = simple_strtoul(this_opt, NULL, 0);
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count++;
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break;
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default:
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return -1;
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}
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}
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screendata->activate = FB_ACTIVATE_NOW;
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screendata->vmode = FB_VMODE_NONINTERLACED;
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return 0;
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}
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static int grvga_probe(struct platform_device *dev)
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{
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struct fb_info *info;
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int retval = -ENOMEM;
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unsigned long virtual_start;
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unsigned long grvga_fix_addr = 0;
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unsigned long physical_start = 0;
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unsigned long grvga_mem_size = 0;
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struct grvga_par *par = NULL;
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char *options = NULL, *mode_opt = NULL;
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info = framebuffer_alloc(sizeof(struct grvga_par), &dev->dev);
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if (!info)
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return -ENOMEM;
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/* Expecting: "grvga: modestring, [addr:<framebuffer physical address>], [size:<framebuffer size>]
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*
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* If modestring is custom:<custom mode string> we parse the string which then contains all videoparameters
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* If address is left out, we allocate memory,
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* if size is left out we only allocate enough to support the given mode.
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*/
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if (fb_get_options("grvga", &options)) {
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retval = -ENODEV;
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goto free_fb;
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}
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if (!options || !*options)
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options = "640x480-8@60";
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while (1) {
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char *this_opt = strsep(&options, ",");
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if (!this_opt)
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break;
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if (!strncmp(this_opt, "custom", 6)) {
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if (grvga_parse_custom(this_opt, &info->var) < 0) {
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dev_err(&dev->dev, "Failed to parse custom mode (%s).\n", this_opt);
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retval = -EINVAL;
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goto free_fb;
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}
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} else if (!strncmp(this_opt, "addr", 4))
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grvga_fix_addr = simple_strtoul(this_opt + 5, NULL, 16);
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else if (!strncmp(this_opt, "size", 4))
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grvga_mem_size = simple_strtoul(this_opt + 5, NULL, 0);
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else
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mode_opt = this_opt;
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}
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par = info->par;
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info->fbops = &grvga_ops;
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info->fix = grvga_fix;
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info->pseudo_palette = par->color_palette;
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info->flags = FBINFO_DEFAULT | FBINFO_PARTIAL_PAN_OK | FBINFO_HWACCEL_YPAN;
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info->fix.smem_len = grvga_mem_size;
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if (!devm_request_mem_region(&dev->dev, dev->resource[0].start,
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resource_size(&dev->resource[0]), "grlib-svgactrl regs")) {
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dev_err(&dev->dev, "registers already mapped\n");
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retval = -EBUSY;
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goto free_fb;
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}
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par->regs = of_ioremap(&dev->resource[0], 0,
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resource_size(&dev->resource[0]),
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"grlib-svgactrl regs");
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if (!par->regs) {
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dev_err(&dev->dev, "failed to map registers\n");
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retval = -ENOMEM;
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goto free_fb;
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}
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retval = fb_alloc_cmap(&info->cmap, 256, 0);
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if (retval < 0) {
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dev_err(&dev->dev, "failed to allocate mem with fb_alloc_cmap\n");
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retval = -ENOMEM;
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goto unmap_regs;
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}
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if (mode_opt) {
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retval = fb_find_mode(&info->var, info, mode_opt,
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grvga_modedb, sizeof(grvga_modedb), &grvga_modedb[0], 8);
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if (!retval || retval == 4) {
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retval = -EINVAL;
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goto dealloc_cmap;
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}
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}
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if (!grvga_mem_size)
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grvga_mem_size = info->var.xres_virtual * info->var.yres_virtual * info->var.bits_per_pixel/8;
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if (grvga_fix_addr) {
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/* Got framebuffer base address from argument list */
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physical_start = grvga_fix_addr;
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if (!devm_request_mem_region(&dev->dev, physical_start,
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grvga_mem_size, dev->name)) {
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dev_err(&dev->dev, "failed to request memory region\n");
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retval = -ENOMEM;
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goto dealloc_cmap;
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}
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virtual_start = (unsigned long) ioremap(physical_start, grvga_mem_size);
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if (!virtual_start) {
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dev_err(&dev->dev, "error mapping framebuffer memory\n");
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retval = -ENOMEM;
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goto dealloc_cmap;
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}
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} else { /* Allocate frambuffer memory */
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unsigned long page;
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virtual_start = (unsigned long) __get_free_pages(GFP_DMA,
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get_order(grvga_mem_size));
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if (!virtual_start) {
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dev_err(&dev->dev,
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"unable to allocate framebuffer memory (%lu bytes)\n",
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grvga_mem_size);
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retval = -ENOMEM;
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goto dealloc_cmap;
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}
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physical_start = dma_map_single(&dev->dev, (void *)virtual_start, grvga_mem_size, DMA_TO_DEVICE);
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/* Set page reserved so that mmap will work. This is necessary
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* since we'll be remapping normal memory.
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*/
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for (page = virtual_start;
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page < PAGE_ALIGN(virtual_start + grvga_mem_size);
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page += PAGE_SIZE) {
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SetPageReserved(virt_to_page(page));
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}
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par->fb_alloced = 1;
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}
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memset((unsigned long *) virtual_start, 0, grvga_mem_size);
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info->screen_base = (char __iomem *) virtual_start;
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info->fix.smem_start = physical_start;
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info->fix.smem_len = grvga_mem_size;
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dev_set_drvdata(&dev->dev, info);
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dev_info(&dev->dev,
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"Aeroflex Gaisler framebuffer device (fb%d), %dx%d-%d, using %luK of video memory @ %p\n",
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info->node, info->var.xres, info->var.yres, info->var.bits_per_pixel,
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grvga_mem_size >> 10, info->screen_base);
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retval = register_framebuffer(info);
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if (retval < 0) {
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dev_err(&dev->dev, "failed to register framebuffer\n");
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goto free_mem;
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}
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__raw_writel(physical_start, &par->regs->fb_pos);
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__raw_writel(__raw_readl(&par->regs->status) | 1, /* Enable framebuffer */
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&par->regs->status);
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return 0;
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free_mem:
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if (grvga_fix_addr)
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iounmap((void *)virtual_start);
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else
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kfree((void *)virtual_start);
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dealloc_cmap:
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fb_dealloc_cmap(&info->cmap);
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unmap_regs:
|
|
of_iounmap(&dev->resource[0], par->regs,
|
|
resource_size(&dev->resource[0]));
|
|
free_fb:
|
|
framebuffer_release(info);
|
|
|
|
return retval;
|
|
}
|
|
|
|
static int grvga_remove(struct platform_device *device)
|
|
{
|
|
struct fb_info *info = dev_get_drvdata(&device->dev);
|
|
struct grvga_par *par;
|
|
|
|
if (info) {
|
|
par = info->par;
|
|
unregister_framebuffer(info);
|
|
fb_dealloc_cmap(&info->cmap);
|
|
|
|
of_iounmap(&device->resource[0], par->regs,
|
|
resource_size(&device->resource[0]));
|
|
|
|
if (!par->fb_alloced)
|
|
iounmap(info->screen_base);
|
|
else
|
|
kfree((void *)info->screen_base);
|
|
|
|
framebuffer_release(info);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct of_device_id svgactrl_of_match[] = {
|
|
{
|
|
.name = "GAISLER_SVGACTRL",
|
|
},
|
|
{
|
|
.name = "01_063",
|
|
},
|
|
{},
|
|
};
|
|
MODULE_DEVICE_TABLE(of, svgactrl_of_match);
|
|
|
|
static struct platform_driver grvga_driver = {
|
|
.driver = {
|
|
.name = "grlib-svgactrl",
|
|
.of_match_table = svgactrl_of_match,
|
|
},
|
|
.probe = grvga_probe,
|
|
.remove = grvga_remove,
|
|
};
|
|
|
|
module_platform_driver(grvga_driver);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_AUTHOR("Aeroflex Gaisler");
|
|
MODULE_DESCRIPTION("Aeroflex Gaisler framebuffer device driver");
|