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Commit ef74d46a authored by Alexander Shiyan's avatar Alexander Shiyan Committed by Tomi Valkeinen
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video: clps711x: Add new Cirrus Logic CLPS711X framebuffer driver 



This adds support for the framebuffer available in the Cirrus
Logic CLPS711X CPUs.
FB features:
- 1-2-4 bits per pixel.
- Programmable panel size to a maximum of 1024x256 at 4 bps.
- Relocatible Frame Buffer (SRAM or SDRAM).
- Programmable refresh rates.
- 16 gray scale values.
This new driver is designed to usage with devicetree only.
The driver have been tested with custom board equipped
Cirrus Logic EP7312.

Signed-off-by: default avatarAlexander Shiyan <shc_work@mail.ru>
Signed-off-by: default avatarTomi Valkeinen <tomi.valkeinen@ti.com>
parent a497c3ba

drivers/video/fbdev/Kconfig

+16 −5
Original line number Diff line number Diff line
@@ -301,15 +301,26 @@ config FB_ACORN 
	  hardware found in Acorn RISC PCs and other ARM-based machines.  If

	  unsure, say N.



config FB_CLPS711X

	bool "CLPS711X LCD support"

	depends on (FB = y) && ARM && ARCH_CLPS711X

config FB_CLPS711X_OLD

	bool

	select FB_CFB_FILLRECT

	select FB_CFB_COPYAREA

	select FB_CFB_IMAGEBLIT



config FB_CLPS711X

	tristate "CLPS711X LCD support"

	depends on FB && (ARCH_CLPS711X || COMPILE_TEST)

	select FB_CLPS711X_OLD if ARCH_CLPS711X && !ARCH_MULTIPLATFORM

	select BACKLIGHT_LCD_SUPPORT

	select FB_MODE_HELPERS

	select FB_SYS_FILLRECT

	select FB_SYS_COPYAREA

	select FB_SYS_IMAGEBLIT

	select LCD_CLASS_DEVICE

	select VIDEOMODE_HELPERS

	help

	  Say Y to enable the Framebuffer driver for the CLPS7111 and

	  EP7212 processors.

	  Say Y to enable the Framebuffer driver for the Cirrus Logic

	  CLPS711X CPUs.



config FB_SA1100

	bool "SA-1100 LCD support"

drivers/video/fbdev/Makefile

+2 −1
Original line number Diff line number Diff line
@@ -14,7 +14,8 @@ obj-$(CONFIG_FB_WMT_GE_ROPS) += wmt_ge_rops.o 
# Hardware specific drivers go first

obj-$(CONFIG_FB_AMIGA)            += amifb.o c2p_planar.o

obj-$(CONFIG_FB_ARC)              += arcfb.o

obj-$(CONFIG_FB_CLPS711X)         += clps711xfb.o

obj-$(CONFIG_FB_CLPS711X)	  += clps711x-fb.o

obj-$(CONFIG_FB_CLPS711X_OLD)	  += clps711xfb.o

obj-$(CONFIG_FB_CYBER2000)        += cyber2000fb.o

obj-$(CONFIG_FB_GRVGA)            += grvga.o

obj-$(CONFIG_FB_PM2)              += pm2fb.o

drivers/video/fbdev/clps711x-fb.c

0 → 100644
+397 −0
Original line number Diff line number Diff line 
/*

 * 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(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,

		.owner		= THIS_MODULE,

		.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");