diff options
Diffstat (limited to '')
| -rw-r--r-- | drivers/video/fbdev/clps711x-fb.c | 394 |
1 files changed, 394 insertions, 0 deletions
diff --git a/drivers/video/fbdev/clps711x-fb.c b/drivers/video/fbdev/clps711x-fb.c new file mode 100644 index 000000000..a1061c2f1 --- /dev/null +++ b/drivers/video/fbdev/clps711x-fb.c @@ -0,0 +1,394 @@ +// 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; + strscpy(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"); |