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alistair23-linux/drivers/video/fbdev/wm8505fb.c
Thomas Gleixner 9c92ab6191 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 
Based on 1 normalized pattern(s):

  this software is licensed under the terms of the gnu general public
  license version 2 as published by the free software foundation and
  may be copied distributed and modified under those terms this
  program is distributed in the hope that it will be useful but
  without any warranty without even the implied warranty of
  merchantability or fitness for a particular purpose see the gnu
  general public license for more details

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 285 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141900.642774971@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:36:37 +02:00

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