412 строки
10 KiB
C
412 строки
10 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* WonderMedia WM8505 Frame Buffer device driver
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*
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* Copyright (C) 2010 Ed Spiridonov <edo.rus@gmail.com>
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* Based on vt8500lcdfb.c
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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/fb.h>
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#include <linux/errno.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/kernel.h>
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#include <linux/memblock.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/of_fdt.h>
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#include <linux/platform_device.h>
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#include <linux/slab.h>
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#include <linux/string.h>
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#include <linux/wait.h>
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#include <video/of_display_timing.h>
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#include "wm8505fb_regs.h"
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#include "wmt_ge_rops.h"
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#define DRIVER_NAME "wm8505-fb"
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#define to_wm8505fb_info(__info) container_of(__info, \
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struct wm8505fb_info, fb)
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struct wm8505fb_info {
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struct fb_info fb;
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void __iomem *regbase;
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unsigned int contrast;
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};
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static int wm8505fb_init_hw(struct fb_info *info)
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{
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struct wm8505fb_info *fbi = to_wm8505fb_info(info);
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int i;
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/* I know the purpose only of few registers, so clear unknown */
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for (i = 0; i < 0x200; i += 4)
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writel(0, fbi->regbase + i);
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/* Set frame buffer address */
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writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR);
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writel(fbi->fb.fix.smem_start, fbi->regbase + WMT_GOVR_FBADDR1);
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/*
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* Set in-memory picture format to RGB
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* 0x31C sets the correct color mode (RGB565) for WM8650
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* Bit 8+9 (0x300) are ignored on WM8505 as reserved
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*/
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writel(0x31c, fbi->regbase + WMT_GOVR_COLORSPACE);
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writel(1, fbi->regbase + WMT_GOVR_COLORSPACE1);
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/* Virtual buffer size */
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writel(info->var.xres, fbi->regbase + WMT_GOVR_XRES);
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writel(info->var.xres_virtual, fbi->regbase + WMT_GOVR_XRES_VIRTUAL);
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/* black magic ;) */
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writel(0xf, fbi->regbase + WMT_GOVR_FHI);
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writel(4, fbi->regbase + WMT_GOVR_DVO_SET);
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writel(1, fbi->regbase + WMT_GOVR_MIF_ENABLE);
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writel(1, fbi->regbase + WMT_GOVR_REG_UPDATE);
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return 0;
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}
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static int wm8505fb_set_timing(struct fb_info *info)
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{
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struct wm8505fb_info *fbi = to_wm8505fb_info(info);
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int h_start = info->var.left_margin;
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int h_end = h_start + info->var.xres;
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int h_all = h_end + info->var.right_margin;
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int h_sync = info->var.hsync_len;
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int v_start = info->var.upper_margin;
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int v_end = v_start + info->var.yres;
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int v_all = v_end + info->var.lower_margin;
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int v_sync = info->var.vsync_len;
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writel(0, fbi->regbase + WMT_GOVR_TG);
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writel(h_start, fbi->regbase + WMT_GOVR_TIMING_H_START);
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writel(h_end, fbi->regbase + WMT_GOVR_TIMING_H_END);
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writel(h_all, fbi->regbase + WMT_GOVR_TIMING_H_ALL);
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writel(h_sync, fbi->regbase + WMT_GOVR_TIMING_H_SYNC);
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writel(v_start, fbi->regbase + WMT_GOVR_TIMING_V_START);
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writel(v_end, fbi->regbase + WMT_GOVR_TIMING_V_END);
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writel(v_all, fbi->regbase + WMT_GOVR_TIMING_V_ALL);
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writel(v_sync, fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
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writel(1, fbi->regbase + WMT_GOVR_TG);
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return 0;
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}
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static int wm8505fb_set_par(struct fb_info *info)
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{
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struct wm8505fb_info *fbi = to_wm8505fb_info(info);
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if (!fbi)
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return -EINVAL;
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if (info->var.bits_per_pixel == 32) {
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info->var.red.offset = 16;
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info->var.red.length = 8;
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info->var.red.msb_right = 0;
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info->var.green.offset = 8;
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info->var.green.length = 8;
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info->var.green.msb_right = 0;
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info->var.blue.offset = 0;
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info->var.blue.length = 8;
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info->var.blue.msb_right = 0;
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info->fix.visual = FB_VISUAL_TRUECOLOR;
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info->fix.line_length = info->var.xres_virtual << 2;
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} else if (info->var.bits_per_pixel == 16) {
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info->var.red.offset = 11;
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info->var.red.length = 5;
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info->var.red.msb_right = 0;
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info->var.green.offset = 5;
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info->var.green.length = 6;
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info->var.green.msb_right = 0;
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info->var.blue.offset = 0;
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info->var.blue.length = 5;
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info->var.blue.msb_right = 0;
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info->fix.visual = FB_VISUAL_TRUECOLOR;
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info->fix.line_length = info->var.xres_virtual << 1;
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}
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wm8505fb_set_timing(info);
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writel(fbi->contrast<<16 | fbi->contrast<<8 | fbi->contrast,
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fbi->regbase + WMT_GOVR_CONTRAST);
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return 0;
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}
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static ssize_t contrast_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct fb_info *info = dev_get_drvdata(dev);
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struct wm8505fb_info *fbi = to_wm8505fb_info(info);
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return sprintf(buf, "%u\n", fbi->contrast);
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}
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static ssize_t contrast_store(struct device *dev,
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struct device_attribute *attr,
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const char *buf, size_t count)
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{
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struct fb_info *info = dev_get_drvdata(dev);
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struct wm8505fb_info *fbi = to_wm8505fb_info(info);
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unsigned long tmp;
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if (kstrtoul(buf, 10, &tmp) || (tmp > 0xff))
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return -EINVAL;
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fbi->contrast = tmp;
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wm8505fb_set_par(info);
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return count;
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}
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static DEVICE_ATTR_RW(contrast);
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static struct attribute *wm8505fb_attrs[] = {
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&dev_attr_contrast.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(wm8505fb);
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static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf)
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{
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chan &= 0xffff;
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chan >>= 16 - bf->length;
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return chan << bf->offset;
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}
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static int wm8505fb_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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struct wm8505fb_info *fbi = to_wm8505fb_info(info);
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int ret = 1;
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unsigned int val;
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if (regno >= 256)
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return -EINVAL;
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if (info->var.grayscale)
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red = green = blue =
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(19595 * red + 38470 * green + 7471 * blue) >> 16;
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switch (fbi->fb.fix.visual) {
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case FB_VISUAL_TRUECOLOR:
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if (regno < 16) {
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u32 *pal = info->pseudo_palette;
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val = chan_to_field(red, &fbi->fb.var.red);
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val |= chan_to_field(green, &fbi->fb.var.green);
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val |= chan_to_field(blue, &fbi->fb.var.blue);
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pal[regno] = val;
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ret = 0;
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}
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break;
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}
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return ret;
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}
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static int wm8505fb_pan_display(struct fb_var_screeninfo *var,
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struct fb_info *info)
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{
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struct wm8505fb_info *fbi = to_wm8505fb_info(info);
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writel(var->xoffset, fbi->regbase + WMT_GOVR_XPAN);
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writel(var->yoffset, fbi->regbase + WMT_GOVR_YPAN);
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return 0;
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}
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static int wm8505fb_blank(int blank, struct fb_info *info)
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{
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struct wm8505fb_info *fbi = to_wm8505fb_info(info);
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switch (blank) {
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case FB_BLANK_UNBLANK:
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wm8505fb_set_timing(info);
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break;
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default:
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writel(0, fbi->regbase + WMT_GOVR_TIMING_V_SYNC);
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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 wm8505fb_ops = {
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.owner = THIS_MODULE,
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.fb_set_par = wm8505fb_set_par,
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.fb_setcolreg = wm8505fb_setcolreg,
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.fb_fillrect = wmt_ge_fillrect,
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.fb_copyarea = wmt_ge_copyarea,
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.fb_imageblit = sys_imageblit,
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.fb_sync = wmt_ge_sync,
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.fb_pan_display = wm8505fb_pan_display,
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.fb_blank = wm8505fb_blank,
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};
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static int wm8505fb_probe(struct platform_device *pdev)
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{
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struct wm8505fb_info *fbi;
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struct resource *res;
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struct display_timings *disp_timing;
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void *addr;
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int ret;
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struct fb_videomode mode;
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u32 bpp;
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dma_addr_t fb_mem_phys;
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unsigned long fb_mem_len;
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void *fb_mem_virt;
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fbi = devm_kzalloc(&pdev->dev, sizeof(struct wm8505fb_info) +
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sizeof(u32) * 16, GFP_KERNEL);
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if (!fbi)
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return -ENOMEM;
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strcpy(fbi->fb.fix.id, DRIVER_NAME);
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fbi->fb.fix.type = FB_TYPE_PACKED_PIXELS;
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fbi->fb.fix.xpanstep = 1;
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fbi->fb.fix.ypanstep = 1;
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fbi->fb.fix.ywrapstep = 0;
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fbi->fb.fix.accel = FB_ACCEL_NONE;
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fbi->fb.fbops = &wm8505fb_ops;
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fbi->fb.flags = FBINFO_DEFAULT
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| FBINFO_HWACCEL_COPYAREA
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| FBINFO_HWACCEL_FILLRECT
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| FBINFO_HWACCEL_XPAN
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| FBINFO_HWACCEL_YPAN
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| FBINFO_VIRTFB
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| FBINFO_PARTIAL_PAN_OK;
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fbi->fb.node = -1;
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addr = fbi;
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addr = addr + sizeof(struct wm8505fb_info);
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fbi->fb.pseudo_palette = addr;
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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fbi->regbase = devm_ioremap_resource(&pdev->dev, res);
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if (IS_ERR(fbi->regbase))
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return PTR_ERR(fbi->regbase);
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disp_timing = of_get_display_timings(pdev->dev.of_node);
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if (!disp_timing)
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return -EINVAL;
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ret = of_get_fb_videomode(pdev->dev.of_node, &mode, OF_USE_NATIVE_MODE);
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if (ret)
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return ret;
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ret = of_property_read_u32(pdev->dev.of_node, "bits-per-pixel", &bpp);
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if (ret)
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return ret;
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fb_videomode_to_var(&fbi->fb.var, &mode);
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fbi->fb.var.nonstd = 0;
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fbi->fb.var.activate = FB_ACTIVATE_NOW;
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fbi->fb.var.height = -1;
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fbi->fb.var.width = -1;
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/* try allocating the framebuffer */
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fb_mem_len = mode.xres * mode.yres * 2 * (bpp / 8);
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fb_mem_virt = dmam_alloc_coherent(&pdev->dev, fb_mem_len, &fb_mem_phys,
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GFP_KERNEL);
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if (!fb_mem_virt) {
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pr_err("%s: Failed to allocate framebuffer\n", __func__);
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return -ENOMEM;
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}
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fbi->fb.var.xres_virtual = mode.xres;
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fbi->fb.var.yres_virtual = mode.yres * 2;
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fbi->fb.var.bits_per_pixel = bpp;
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fbi->fb.fix.smem_start = fb_mem_phys;
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fbi->fb.fix.smem_len = fb_mem_len;
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fbi->fb.screen_base = fb_mem_virt;
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fbi->fb.screen_size = fb_mem_len;
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fbi->contrast = 0x10;
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ret = wm8505fb_set_par(&fbi->fb);
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if (ret) {
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dev_err(&pdev->dev, "Failed to set parameters\n");
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return ret;
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}
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if (fb_alloc_cmap(&fbi->fb.cmap, 256, 0) < 0) {
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dev_err(&pdev->dev, "Failed to allocate color map\n");
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return -ENOMEM;
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}
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wm8505fb_init_hw(&fbi->fb);
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platform_set_drvdata(pdev, fbi);
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ret = register_framebuffer(&fbi->fb);
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if (ret < 0) {
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dev_err(&pdev->dev,
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"Failed to register framebuffer device: %d\n", ret);
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if (fbi->fb.cmap.len)
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fb_dealloc_cmap(&fbi->fb.cmap);
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return ret;
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}
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fb_info(&fbi->fb, "%s frame buffer at 0x%lx-0x%lx\n",
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fbi->fb.fix.id, fbi->fb.fix.smem_start,
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fbi->fb.fix.smem_start + fbi->fb.fix.smem_len - 1);
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return 0;
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}
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static int wm8505fb_remove(struct platform_device *pdev)
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{
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struct wm8505fb_info *fbi = platform_get_drvdata(pdev);
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unregister_framebuffer(&fbi->fb);
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writel(0, fbi->regbase);
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if (fbi->fb.cmap.len)
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fb_dealloc_cmap(&fbi->fb.cmap);
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return 0;
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}
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static const struct of_device_id wmt_dt_ids[] = {
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{ .compatible = "wm,wm8505-fb", },
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{}
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};
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static struct platform_driver wm8505fb_driver = {
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.probe = wm8505fb_probe,
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.remove = wm8505fb_remove,
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.driver = {
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.name = DRIVER_NAME,
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.of_match_table = wmt_dt_ids,
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.dev_groups = wm8505fb_groups,
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},
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};
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module_platform_driver(wm8505fb_driver);
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MODULE_AUTHOR("Ed Spiridonov <edo.rus@gmail.com>");
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MODULE_DESCRIPTION("Framebuffer driver for WMT WM8505");
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MODULE_LICENSE("GPL v2");
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MODULE_DEVICE_TABLE(of, wmt_dt_ids);
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