// SPDX-License-Identifier: GPL-2.0-or-later /* * 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> */ #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,ep7209-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) { of_node_put(disp); 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); of_node_put(disp); 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,ep7209-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");