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linux-sg2042/drivers/video/fbdev/clps711x-fb.c

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/*
* Cirrus Logic CLPS711X FB driver
*
* Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
* Based on driver by Russell King <rmk@arm.linux.org.uk>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/clk.h>
#include <linux/fb.h>
#include <linux/io.h>
#include <linux/lcd.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#include <linux/mfd/syscon.h>
#include <linux/mfd/syscon/clps711x.h>
#include <linux/regulator/consumer.h>
#include <video/of_display_timing.h>
#define CLPS711X_FB_NAME "clps711x-fb"
#define CLPS711X_FB_BPP_MAX (4)
/* Registers relative to LCDCON */
#define CLPS711X_LCDCON (0x0000)
# define LCDCON_GSEN BIT(30)
# define LCDCON_GSMD BIT(31)
#define CLPS711X_PALLSW (0x0280)
#define CLPS711X_PALMSW (0x02c0)
#define CLPS711X_FBADDR (0x0d40)
struct clps711x_fb_info {
struct clk *clk;
void __iomem *base;
struct regmap *syscon;
resource_size_t buffsize;
struct fb_videomode mode;
struct regulator *lcd_pwr;
u32 ac_prescale;
bool cmap_invert;
};
static int clps711x_fb_setcolreg(u_int regno, u_int red, u_int green,
u_int blue, u_int transp, struct fb_info *info)
{
struct clps711x_fb_info *cfb = info->par;
u32 level, mask, shift;
if (regno >= BIT(info->var.bits_per_pixel))
return -EINVAL;
shift = 4 * (regno & 7);
mask = 0xf << shift;
/* gray = 0.30*R + 0.58*G + 0.11*B */
level = (((red * 77 + green * 151 + blue * 28) >> 20) << shift) & mask;
if (cfb->cmap_invert)
level = 0xf - level;
regno = (regno < 8) ? CLPS711X_PALLSW : CLPS711X_PALMSW;
writel((readl(cfb->base + regno) & ~mask) | level, cfb->base + regno);
return 0;
}
static int clps711x_fb_check_var(struct fb_var_screeninfo *var,
struct fb_info *info)
{
u32 val;
if (var->bits_per_pixel < 1 ||
var->bits_per_pixel > CLPS711X_FB_BPP_MAX)
return -EINVAL;
if (!var->pixclock)
return -EINVAL;
val = DIV_ROUND_UP(var->xres, 16) - 1;
if (val < 0x01 || val > 0x3f)
return -EINVAL;
val = DIV_ROUND_UP(var->yres * var->xres * var->bits_per_pixel, 128);
val--;
if (val < 0x001 || val > 0x1fff)
return -EINVAL;
var->transp.msb_right = 0;
var->transp.offset = 0;
var->transp.length = 0;
var->red.msb_right = 0;
var->red.offset = 0;
var->red.length = var->bits_per_pixel;
var->green = var->red;
var->blue = var->red;
var->grayscale = var->bits_per_pixel > 1;
return 0;
}
static int clps711x_fb_set_par(struct fb_info *info)
{
struct clps711x_fb_info *cfb = info->par;
resource_size_t size;
u32 lcdcon, pps;
size = (info->var.xres * info->var.yres * info->var.bits_per_pixel) / 8;
if (size > cfb->buffsize)
return -EINVAL;
switch (info->var.bits_per_pixel) {
case 1:
info->fix.visual = FB_VISUAL_MONO01;
break;
case 2:
case 4:
info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
break;
default:
return -EINVAL;
}
info->fix.line_length = info->var.xres * info->var.bits_per_pixel / 8;
info->fix.smem_len = size;
lcdcon = (info->var.xres * info->var.yres *
info->var.bits_per_pixel) / 128 - 1;
lcdcon |= ((info->var.xres / 16) - 1) << 13;
lcdcon |= (cfb->ac_prescale & 0x1f) << 25;
pps = clk_get_rate(cfb->clk) / (PICOS2KHZ(info->var.pixclock) * 1000);
if (pps)
pps--;
lcdcon |= (pps & 0x3f) << 19;
if (info->var.bits_per_pixel == 4)
lcdcon |= LCDCON_GSMD;
if (info->var.bits_per_pixel >= 2)
lcdcon |= LCDCON_GSEN;
/* LCDCON must only be changed while the LCD is disabled */
regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0);
writel(lcdcon, cfb->base + CLPS711X_LCDCON);
regmap_update_bits(cfb->syscon, SYSCON_OFFSET,
SYSCON1_LCDEN, SYSCON1_LCDEN);
return 0;
}
static int clps711x_fb_blank(int blank, struct fb_info *info)
{
/* Return happy */
return 0;
}
static struct fb_ops clps711x_fb_ops = {
.owner = THIS_MODULE,
.fb_setcolreg = clps711x_fb_setcolreg,
.fb_check_var = clps711x_fb_check_var,
.fb_set_par = clps711x_fb_set_par,
.fb_blank = clps711x_fb_blank,
.fb_fillrect = sys_fillrect,
.fb_copyarea = sys_copyarea,
.fb_imageblit = sys_imageblit,
};
static int clps711x_lcd_check_fb(struct lcd_device *lcddev, struct fb_info *fi)
{
struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev);
return (!fi || fi->par == cfb) ? 1 : 0;
}
static int clps711x_lcd_get_power(struct lcd_device *lcddev)
{
struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev);
if (!IS_ERR_OR_NULL(cfb->lcd_pwr))
if (!regulator_is_enabled(cfb->lcd_pwr))
return FB_BLANK_NORMAL;
return FB_BLANK_UNBLANK;
}
static int clps711x_lcd_set_power(struct lcd_device *lcddev, int blank)
{
struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev);
if (!IS_ERR_OR_NULL(cfb->lcd_pwr)) {
if (blank == FB_BLANK_UNBLANK) {
if (!regulator_is_enabled(cfb->lcd_pwr))
return regulator_enable(cfb->lcd_pwr);
} else {
if (regulator_is_enabled(cfb->lcd_pwr))
return regulator_disable(cfb->lcd_pwr);
}
}
return 0;
}
static struct lcd_ops clps711x_lcd_ops = {
.check_fb = clps711x_lcd_check_fb,
.get_power = clps711x_lcd_get_power,
.set_power = clps711x_lcd_set_power,
};
static int clps711x_fb_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct device_node *disp, *np = dev->of_node;
struct clps711x_fb_info *cfb;
struct lcd_device *lcd;
struct fb_info *info;
struct resource *res;
int ret = -ENOENT;
u32 val;
if (fb_get_options(CLPS711X_FB_NAME, NULL))
return -ENODEV;
info = framebuffer_alloc(sizeof(*cfb), dev);
if (!info)
return -ENOMEM;
cfb = info->par;
platform_set_drvdata(pdev, info);
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
goto out_fb_release;
cfb->base = devm_ioremap(dev, res->start, resource_size(res));
if (!cfb->base) {
ret = -ENOMEM;
goto out_fb_release;
}
info->fix.mmio_start = res->start;
info->fix.mmio_len = resource_size(res);
res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
info->screen_base = devm_ioremap_resource(dev, res);
if (IS_ERR(info->screen_base)) {
ret = PTR_ERR(info->screen_base);
goto out_fb_release;
}
/* Physical address should be aligned to 256 MiB */
if (res->start & 0x0fffffff) {
ret = -EINVAL;
goto out_fb_release;
}
info->apertures = alloc_apertures(1);
if (!info->apertures) {
ret = -ENOMEM;
goto out_fb_release;
}
cfb->buffsize = resource_size(res);
info->fix.smem_start = res->start;
info->apertures->ranges[0].base = info->fix.smem_start;
info->apertures->ranges[0].size = cfb->buffsize;
cfb->clk = devm_clk_get(dev, NULL);
if (IS_ERR(cfb->clk)) {
ret = PTR_ERR(cfb->clk);
goto out_fb_release;
}
cfb->syscon =
syscon_regmap_lookup_by_compatible("cirrus,clps711x-syscon1");
if (IS_ERR(cfb->syscon)) {
ret = PTR_ERR(cfb->syscon);
goto out_fb_release;
}
disp = of_parse_phandle(np, "display", 0);
if (!disp) {
dev_err(&pdev->dev, "No display defined\n");
ret = -ENODATA;
goto out_fb_release;
}
ret = of_get_fb_videomode(disp, &cfb->mode, OF_USE_NATIVE_MODE);
if (ret)
goto out_fb_release;
of_property_read_u32(disp, "ac-prescale", &cfb->ac_prescale);
cfb->cmap_invert = of_property_read_bool(disp, "cmap-invert");
ret = of_property_read_u32(disp, "bits-per-pixel",
&info->var.bits_per_pixel);
if (ret)
goto out_fb_release;
/* Force disable LCD on any mismatch */
if (info->fix.smem_start != (readb(cfb->base + CLPS711X_FBADDR) << 28))
regmap_update_bits(cfb->syscon, SYSCON_OFFSET,
SYSCON1_LCDEN, 0);
ret = regmap_read(cfb->syscon, SYSCON_OFFSET, &val);
if (ret)
goto out_fb_release;
if (!(val & SYSCON1_LCDEN)) {
/* Setup start FB address */
writeb(info->fix.smem_start >> 28, cfb->base + CLPS711X_FBADDR);
/* Clean FB memory */
memset_io(info->screen_base, 0, cfb->buffsize);
}
cfb->lcd_pwr = devm_regulator_get(dev, "lcd");
if (PTR_ERR(cfb->lcd_pwr) == -EPROBE_DEFER) {
ret = -EPROBE_DEFER;
goto out_fb_release;
}
info->fbops = &clps711x_fb_ops;
info->flags = FBINFO_DEFAULT;
info->var.activate = FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
info->var.height = -1;
info->var.width = -1;
info->var.vmode = FB_VMODE_NONINTERLACED;
info->fix.type = FB_TYPE_PACKED_PIXELS;
info->fix.accel = FB_ACCEL_NONE;
strlcpy(info->fix.id, CLPS711X_FB_NAME, sizeof(info->fix.id));
fb_videomode_to_var(&info->var, &cfb->mode);
ret = fb_alloc_cmap(&info->cmap, BIT(CLPS711X_FB_BPP_MAX), 0);
if (ret)
goto out_fb_release;
ret = fb_set_var(info, &info->var);
if (ret)
goto out_fb_dealloc_cmap;
ret = register_framebuffer(info);
if (ret)
goto out_fb_dealloc_cmap;
lcd = devm_lcd_device_register(dev, "clps711x-lcd", dev, cfb,
&clps711x_lcd_ops);
if (!IS_ERR(lcd))
return 0;
ret = PTR_ERR(lcd);
unregister_framebuffer(info);
out_fb_dealloc_cmap:
regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0);
fb_dealloc_cmap(&info->cmap);
out_fb_release:
framebuffer_release(info);
return ret;
}
static int clps711x_fb_remove(struct platform_device *pdev)
{
struct fb_info *info = platform_get_drvdata(pdev);
struct clps711x_fb_info *cfb = info->par;
regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0);
unregister_framebuffer(info);
fb_dealloc_cmap(&info->cmap);
framebuffer_release(info);
return 0;
}
static const struct of_device_id clps711x_fb_dt_ids[] = {
{ .compatible = "cirrus,clps711x-fb", },
{ }
};
MODULE_DEVICE_TABLE(of, clps711x_fb_dt_ids);
static struct platform_driver clps711x_fb_driver = {
.driver = {
.name = CLPS711X_FB_NAME,
.of_match_table = clps711x_fb_dt_ids,
},
.probe = clps711x_fb_probe,
.remove = clps711x_fb_remove,
};
module_platform_driver(clps711x_fb_driver);
MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
MODULE_DESCRIPTION("Cirrus Logic CLPS711X FB driver");
MODULE_LICENSE("GPL");
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