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: Alexander Shiyan <shc_work@mail.ru> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Alexander Shiyan
Tomi Valkeinen
Родитель
a497c3ba1d
Коммит
ef74d46a4e
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@ -301,15 +301,26 @@ config FB_ACORN
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hardware found in Acorn RISC PCs and other ARM-based machines. If
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unsure, say N.
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config FB_CLPS711X
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bool "CLPS711X LCD support"
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depends on (FB = y) && ARM && ARCH_CLPS711X
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config FB_CLPS711X_OLD
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bool
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select FB_CFB_FILLRECT
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select FB_CFB_COPYAREA
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select FB_CFB_IMAGEBLIT
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config FB_CLPS711X
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tristate "CLPS711X LCD support"
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depends on FB && (ARCH_CLPS711X || COMPILE_TEST)
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select FB_CLPS711X_OLD if ARCH_CLPS711X && !ARCH_MULTIPLATFORM
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select BACKLIGHT_LCD_SUPPORT
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select FB_MODE_HELPERS
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select FB_SYS_FILLRECT
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select FB_SYS_COPYAREA
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select FB_SYS_IMAGEBLIT
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select LCD_CLASS_DEVICE
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select VIDEOMODE_HELPERS
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help
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Say Y to enable the Framebuffer driver for the CLPS7111 and
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EP7212 processors.
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Say Y to enable the Framebuffer driver for the Cirrus Logic
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CLPS711X CPUs.
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config FB_SA1100
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bool "SA-1100 LCD support"
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@ -14,7 +14,8 @@ obj-$(CONFIG_FB_WMT_GE_ROPS) += wmt_ge_rops.o
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# Hardware specific drivers go first
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obj-$(CONFIG_FB_AMIGA) += amifb.o c2p_planar.o
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obj-$(CONFIG_FB_ARC) += arcfb.o
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obj-$(CONFIG_FB_CLPS711X) += clps711xfb.o
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obj-$(CONFIG_FB_CLPS711X) += clps711x-fb.o
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obj-$(CONFIG_FB_CLPS711X_OLD) += clps711xfb.o
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obj-$(CONFIG_FB_CYBER2000) += cyber2000fb.o
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obj-$(CONFIG_FB_GRVGA) += grvga.o
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obj-$(CONFIG_FB_PM2) += pm2fb.o
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@ -0,0 +1,397 @@
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/*
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* Cirrus Logic CLPS711X FB driver
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*
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* Copyright (C) 2014 Alexander Shiyan <shc_work@mail.ru>
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* Based on driver by Russell King <rmk@arm.linux.org.uk>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/clk.h>
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#include <linux/fb.h>
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#include <linux/io.h>
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#include <linux/lcd.h>
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#include <linux/module.h>
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#include <linux/of.h>
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#include <linux/platform_device.h>
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#include <linux/regmap.h>
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#include <linux/mfd/syscon.h>
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#include <linux/mfd/syscon/clps711x.h>
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#include <linux/regulator/consumer.h>
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#include <video/of_display_timing.h>
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#define CLPS711X_FB_NAME "clps711x-fb"
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#define CLPS711X_FB_BPP_MAX (4)
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/* Registers relative to LCDCON */
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#define CLPS711X_LCDCON (0x0000)
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# define LCDCON_GSEN BIT(30)
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# define LCDCON_GSMD BIT(31)
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#define CLPS711X_PALLSW (0x0280)
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#define CLPS711X_PALMSW (0x02c0)
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#define CLPS711X_FBADDR (0x0d40)
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struct clps711x_fb_info {
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struct clk *clk;
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void __iomem *base;
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struct regmap *syscon;
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resource_size_t buffsize;
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struct fb_videomode mode;
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struct regulator *lcd_pwr;
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u32 ac_prescale;
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bool cmap_invert;
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};
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static int clps711x_fb_setcolreg(u_int regno, u_int red, u_int green,
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u_int blue, u_int transp, struct fb_info *info)
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{
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struct clps711x_fb_info *cfb = info->par;
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u32 level, mask, shift;
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if (regno >= BIT(info->var.bits_per_pixel))
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return -EINVAL;
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shift = 4 * (regno & 7);
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mask = 0xf << shift;
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/* gray = 0.30*R + 0.58*G + 0.11*B */
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level = (((red * 77 + green * 151 + blue * 28) >> 20) << shift) & mask;
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if (cfb->cmap_invert)
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level = 0xf - level;
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regno = (regno < 8) ? CLPS711X_PALLSW : CLPS711X_PALMSW;
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writel((readl(cfb->base + regno) & ~mask) | level, cfb->base + regno);
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return 0;
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}
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static int clps711x_fb_check_var(struct fb_var_screeninfo *var,
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struct fb_info *info)
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{
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u32 val;
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if (var->bits_per_pixel < 1 ||
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var->bits_per_pixel > CLPS711X_FB_BPP_MAX)
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return -EINVAL;
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if (!var->pixclock)
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return -EINVAL;
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val = DIV_ROUND_UP(var->xres, 16) - 1;
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if (val < 0x01 || val > 0x3f)
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return -EINVAL;
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val = DIV_ROUND_UP(var->yres * var->xres * var->bits_per_pixel, 128);
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val--;
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if (val < 0x001 || val > 0x1fff)
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return -EINVAL;
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var->transp.msb_right = 0;
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var->transp.offset = 0;
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var->transp.length = 0;
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var->red.msb_right = 0;
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var->red.offset = 0;
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var->red.length = var->bits_per_pixel;
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var->green = var->red;
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var->blue = var->red;
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var->grayscale = var->bits_per_pixel > 1;
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return 0;
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}
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static int clps711x_fb_set_par(struct fb_info *info)
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{
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struct clps711x_fb_info *cfb = info->par;
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resource_size_t size;
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u32 lcdcon, pps;
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size = (info->var.xres * info->var.yres * info->var.bits_per_pixel) / 8;
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if (size > cfb->buffsize)
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return -EINVAL;
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switch (info->var.bits_per_pixel) {
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case 1:
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info->fix.visual = FB_VISUAL_MONO01;
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break;
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case 2:
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case 4:
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info->fix.visual = FB_VISUAL_PSEUDOCOLOR;
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break;
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default:
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return -EINVAL;
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}
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info->fix.line_length = info->var.xres * info->var.bits_per_pixel / 8;
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info->fix.smem_len = size;
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lcdcon = (info->var.xres * info->var.yres *
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info->var.bits_per_pixel) / 128 - 1;
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lcdcon |= ((info->var.xres / 16) - 1) << 13;
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lcdcon |= (cfb->ac_prescale & 0x1f) << 25;
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pps = clk_get_rate(cfb->clk) / (PICOS2KHZ(info->var.pixclock) * 1000);
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if (pps)
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pps--;
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lcdcon |= (pps & 0x3f) << 19;
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if (info->var.bits_per_pixel == 4)
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lcdcon |= LCDCON_GSMD;
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if (info->var.bits_per_pixel >= 2)
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lcdcon |= LCDCON_GSEN;
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/* LCDCON must only be changed while the LCD is disabled */
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regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0);
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writel(lcdcon, cfb->base + CLPS711X_LCDCON);
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regmap_update_bits(cfb->syscon, SYSCON_OFFSET,
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SYSCON1_LCDEN, SYSCON1_LCDEN);
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return 0;
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}
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static int clps711x_fb_blank(int blank, struct fb_info *info)
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{
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/* Return happy */
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return 0;
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}
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static struct fb_ops clps711x_fb_ops = {
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.owner = THIS_MODULE,
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.fb_setcolreg = clps711x_fb_setcolreg,
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.fb_check_var = clps711x_fb_check_var,
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.fb_set_par = clps711x_fb_set_par,
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.fb_blank = clps711x_fb_blank,
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.fb_fillrect = sys_fillrect,
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.fb_copyarea = sys_copyarea,
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.fb_imageblit = sys_imageblit,
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};
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static int clps711x_lcd_check_fb(struct lcd_device *lcddev, struct fb_info *fi)
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{
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struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev);
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return (!fi || fi->par == cfb) ? 1 : 0;
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}
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static int clps711x_lcd_get_power(struct lcd_device *lcddev)
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{
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struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev);
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if (!IS_ERR_OR_NULL(cfb->lcd_pwr))
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if (!regulator_is_enabled(cfb->lcd_pwr))
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return FB_BLANK_NORMAL;
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return FB_BLANK_UNBLANK;
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}
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static int clps711x_lcd_set_power(struct lcd_device *lcddev, int blank)
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{
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struct clps711x_fb_info *cfb = dev_get_drvdata(&lcddev->dev);
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if (!IS_ERR_OR_NULL(cfb->lcd_pwr)) {
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if (blank == FB_BLANK_UNBLANK) {
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if (!regulator_is_enabled(cfb->lcd_pwr))
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return regulator_enable(cfb->lcd_pwr);
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} else {
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if (regulator_is_enabled(cfb->lcd_pwr))
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return regulator_disable(cfb->lcd_pwr);
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}
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}
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return 0;
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}
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static struct lcd_ops clps711x_lcd_ops = {
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.check_fb = clps711x_lcd_check_fb,
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.get_power = clps711x_lcd_get_power,
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.set_power = clps711x_lcd_set_power,
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};
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static int clps711x_fb_probe(struct platform_device *pdev)
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{
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struct device *dev = &pdev->dev;
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struct device_node *disp, *np = dev->of_node;
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struct clps711x_fb_info *cfb;
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struct lcd_device *lcd;
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struct fb_info *info;
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struct resource *res;
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int ret = -ENOENT;
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u32 val;
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if (fb_get_options(CLPS711X_FB_NAME, NULL))
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return -ENODEV;
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info = framebuffer_alloc(sizeof(*cfb), dev);
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if (!info)
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return -ENOMEM;
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cfb = info->par;
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platform_set_drvdata(pdev, info);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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goto out_fb_release;
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cfb->base = devm_ioremap(dev, res->start, resource_size(res));
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if (!cfb->base) {
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ret = -ENOMEM;
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goto out_fb_release;
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}
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info->fix.mmio_start = res->start;
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info->fix.mmio_len = resource_size(res);
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res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
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info->screen_base = devm_ioremap_resource(dev, res);
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if (IS_ERR(info->screen_base)) {
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ret = PTR_ERR(info->screen_base);
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goto out_fb_release;
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}
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/* Physical address should be aligned to 256 MiB */
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if (res->start & 0x0fffffff) {
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ret = -EINVAL;
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goto out_fb_release;
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}
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info->apertures = alloc_apertures(1);
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if (!info->apertures) {
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ret = -ENOMEM;
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goto out_fb_release;
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}
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cfb->buffsize = resource_size(res);
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info->fix.smem_start = res->start;
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info->apertures->ranges[0].base = info->fix.smem_start;
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info->apertures->ranges[0].size = cfb->buffsize;
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cfb->clk = devm_clk_get(dev, NULL);
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if (IS_ERR(cfb->clk)) {
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ret = PTR_ERR(cfb->clk);
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goto out_fb_release;
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}
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cfb->syscon =
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syscon_regmap_lookup_by_compatible("cirrus,clps711x-syscon1");
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if (IS_ERR(cfb->syscon)) {
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ret = PTR_ERR(cfb->syscon);
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goto out_fb_release;
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}
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disp = of_parse_phandle(np, "display", 0);
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if (!disp) {
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dev_err(&pdev->dev, "No display defined\n");
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ret = -ENODATA;
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goto out_fb_release;
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}
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ret = of_get_fb_videomode(disp, &cfb->mode, OF_USE_NATIVE_MODE);
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if (ret)
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goto out_fb_release;
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of_property_read_u32(disp, "ac-prescale", &cfb->ac_prescale);
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cfb->cmap_invert = of_property_read_bool(disp, "cmap-invert");
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ret = of_property_read_u32(disp, "bits-per-pixel",
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&info->var.bits_per_pixel);
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if (ret)
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goto out_fb_release;
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/* Force disable LCD on any mismatch */
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if (info->fix.smem_start != (readb(cfb->base + CLPS711X_FBADDR) << 28))
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regmap_update_bits(cfb->syscon, SYSCON_OFFSET,
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SYSCON1_LCDEN, 0);
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ret = regmap_read(cfb->syscon, SYSCON_OFFSET, &val);
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if (ret)
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goto out_fb_release;
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if (!(val & SYSCON1_LCDEN)) {
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/* Setup start FB address */
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writeb(info->fix.smem_start >> 28, cfb->base + CLPS711X_FBADDR);
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/* Clean FB memory */
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memset(info->screen_base, 0, cfb->buffsize);
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}
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cfb->lcd_pwr = devm_regulator_get(dev, "lcd");
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if (PTR_ERR(cfb->lcd_pwr) == -EPROBE_DEFER) {
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ret = -EPROBE_DEFER;
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goto out_fb_release;
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}
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info->fbops = &clps711x_fb_ops;
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info->flags = FBINFO_DEFAULT;
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info->var.activate = FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;
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info->var.height = -1;
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info->var.width = -1;
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info->var.vmode = FB_VMODE_NONINTERLACED;
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info->fix.type = FB_TYPE_PACKED_PIXELS;
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info->fix.accel = FB_ACCEL_NONE;
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strlcpy(info->fix.id, CLPS711X_FB_NAME, sizeof(info->fix.id));
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fb_videomode_to_var(&info->var, &cfb->mode);
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ret = fb_alloc_cmap(&info->cmap, BIT(CLPS711X_FB_BPP_MAX), 0);
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if (ret)
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goto out_fb_release;
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ret = fb_set_var(info, &info->var);
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if (ret)
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goto out_fb_dealloc_cmap;
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ret = register_framebuffer(info);
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if (ret)
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goto out_fb_dealloc_cmap;
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lcd = devm_lcd_device_register(dev, "clps711x-lcd", dev, cfb,
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&clps711x_lcd_ops);
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if (!IS_ERR(lcd))
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return 0;
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ret = PTR_ERR(lcd);
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unregister_framebuffer(info);
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out_fb_dealloc_cmap:
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regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0);
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fb_dealloc_cmap(&info->cmap);
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out_fb_release:
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framebuffer_release(info);
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|
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return ret;
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}
|
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|
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static int clps711x_fb_remove(struct platform_device *pdev)
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||||
{
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struct fb_info *info = platform_get_drvdata(pdev);
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struct clps711x_fb_info *cfb = info->par;
|
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|
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regmap_update_bits(cfb->syscon, SYSCON_OFFSET, SYSCON1_LCDEN, 0);
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unregister_framebuffer(info);
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fb_dealloc_cmap(&info->cmap);
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framebuffer_release(info);
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||||
|
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return 0;
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||||
}
|
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|
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static const struct of_device_id clps711x_fb_dt_ids[] = {
|
||||
{ .compatible = "cirrus,clps711x-fb", },
|
||||
{ }
|
||||
};
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MODULE_DEVICE_TABLE(of, clps711x_fb_dt_ids);
|
||||
|
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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);
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||||
|
||||
MODULE_AUTHOR("Alexander Shiyan <shc_work@mail.ru>");
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MODULE_DESCRIPTION("Cirrus Logic CLPS711X FB driver");
|
||||
MODULE_LICENSE("GPL");
|
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