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411 lines
10 KiB
411 lines
10 KiB
// 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 <[email protected]> |
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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 const 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_buffer = 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 <[email protected]>"); |
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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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