| // 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 const 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_phandle(np, "syscon"); |
| 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"); |