video: clps711x: Add new Cirrus Logic CLPS711X framebuffer driver
authorAlexander Shiyan <shc_work@mail.ru>
Thu, 19 Jun 2014 16:20:43 +0000 (20:20 +0400)
committerTomi Valkeinen <tomi.valkeinen@ti.com>
Tue, 24 Jun 2014 07:54:27 +0000 (10:54 +0300)
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>
drivers/video/fbdev/Kconfig
drivers/video/fbdev/Makefile
drivers/video/fbdev/clps711x-fb.c [new file with mode: 0644]

index 59c98bfd5a8a68299aa87cc356b054af7a47558e..06e1ff8f9b627152c5f019f0844fb2f4cd599b77 100644 (file)
@@ -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"
index 0284f2a12538c30d906de8084a59903016bda9e4..4e0b8c40ffe668e963b1b4733babe8fc806cf53b 100644 (file)
@@ -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
diff --git a/drivers/video/fbdev/clps711x-fb.c b/drivers/video/fbdev/clps711x-fb.c
new file mode 100644 (file)
index 0000000..4d17fbb
--- /dev/null
@@ -0,0 +1,397 @@
+/*
+ * 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");