diff options
Diffstat (limited to 'drivers/video/fbdev/ep93xx-fb.c')
| -rw-r--r-- | drivers/video/fbdev/ep93xx-fb.c | 605 |
1 files changed, 605 insertions, 0 deletions
diff --git a/drivers/video/fbdev/ep93xx-fb.c b/drivers/video/fbdev/ep93xx-fb.c new file mode 100644 index 0000000000..d94e3e8d14 --- /dev/null +++ b/drivers/video/fbdev/ep93xx-fb.c @@ -0,0 +1,605 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * linux/drivers/video/ep93xx-fb.c + * + * Framebuffer support for the EP93xx series. + * + * Copyright (C) 2007 Bluewater Systems Ltd + * Author: Ryan Mallon + * + * Copyright (c) 2009 H Hartley Sweeten <hsweeten@visionengravers.com> + * + * Based on the Cirrus Logic ep93xxfb driver, and various other ep93xxfb + * drivers. + */ + +#include <linux/platform_device.h> +#include <linux/module.h> +#include <linux/dma-mapping.h> +#include <linux/slab.h> +#include <linux/clk.h> +#include <linux/fb.h> +#include <linux/io.h> + +#include <linux/platform_data/video-ep93xx.h> + +/* Vertical Frame Timing Registers */ +#define EP93XXFB_VLINES_TOTAL 0x0000 /* SW locked */ +#define EP93XXFB_VSYNC 0x0004 /* SW locked */ +#define EP93XXFB_VACTIVE 0x0008 /* SW locked */ +#define EP93XXFB_VBLANK 0x0228 /* SW locked */ +#define EP93XXFB_VCLK 0x000c /* SW locked */ + +/* Horizontal Frame Timing Registers */ +#define EP93XXFB_HCLKS_TOTAL 0x0010 /* SW locked */ +#define EP93XXFB_HSYNC 0x0014 /* SW locked */ +#define EP93XXFB_HACTIVE 0x0018 /* SW locked */ +#define EP93XXFB_HBLANK 0x022c /* SW locked */ +#define EP93XXFB_HCLK 0x001c /* SW locked */ + +/* Frame Buffer Memory Configuration Registers */ +#define EP93XXFB_SCREEN_PAGE 0x0028 +#define EP93XXFB_SCREEN_HPAGE 0x002c +#define EP93XXFB_SCREEN_LINES 0x0030 +#define EP93XXFB_LINE_LENGTH 0x0034 +#define EP93XXFB_VLINE_STEP 0x0038 +#define EP93XXFB_LINE_CARRY 0x003c /* SW locked */ +#define EP93XXFB_EOL_OFFSET 0x0230 + +/* Other Video Registers */ +#define EP93XXFB_BRIGHTNESS 0x0020 +#define EP93XXFB_ATTRIBS 0x0024 /* SW locked */ +#define EP93XXFB_SWLOCK 0x007c /* SW locked */ +#define EP93XXFB_AC_RATE 0x0214 +#define EP93XXFB_FIFO_LEVEL 0x0234 +#define EP93XXFB_PIXELMODE 0x0054 +#define EP93XXFB_PIXELMODE_32BPP (0x7 << 0) +#define EP93XXFB_PIXELMODE_24BPP (0x6 << 0) +#define EP93XXFB_PIXELMODE_16BPP (0x4 << 0) +#define EP93XXFB_PIXELMODE_8BPP (0x2 << 0) +#define EP93XXFB_PIXELMODE_SHIFT_1P_24B (0x0 << 3) +#define EP93XXFB_PIXELMODE_SHIFT_1P_18B (0x1 << 3) +#define EP93XXFB_PIXELMODE_COLOR_LUT (0x0 << 10) +#define EP93XXFB_PIXELMODE_COLOR_888 (0x4 << 10) +#define EP93XXFB_PIXELMODE_COLOR_555 (0x5 << 10) +#define EP93XXFB_PARL_IF_OUT 0x0058 +#define EP93XXFB_PARL_IF_IN 0x005c + +/* Blink Control Registers */ +#define EP93XXFB_BLINK_RATE 0x0040 +#define EP93XXFB_BLINK_MASK 0x0044 +#define EP93XXFB_BLINK_PATTRN 0x0048 +#define EP93XXFB_PATTRN_MASK 0x004c +#define EP93XXFB_BKGRND_OFFSET 0x0050 + +/* Hardware Cursor Registers */ +#define EP93XXFB_CURSOR_ADR_START 0x0060 +#define EP93XXFB_CURSOR_ADR_RESET 0x0064 +#define EP93XXFB_CURSOR_SIZE 0x0068 +#define EP93XXFB_CURSOR_COLOR1 0x006c +#define EP93XXFB_CURSOR_COLOR2 0x0070 +#define EP93XXFB_CURSOR_BLINK_COLOR1 0x021c +#define EP93XXFB_CURSOR_BLINK_COLOR2 0x0220 +#define EP93XXFB_CURSOR_XY_LOC 0x0074 +#define EP93XXFB_CURSOR_DSCAN_HY_LOC 0x0078 +#define EP93XXFB_CURSOR_BLINK_RATE_CTRL 0x0224 + +/* LUT Registers */ +#define EP93XXFB_GRY_SCL_LUTR 0x0080 +#define EP93XXFB_GRY_SCL_LUTG 0x0280 +#define EP93XXFB_GRY_SCL_LUTB 0x0300 +#define EP93XXFB_LUT_SW_CONTROL 0x0218 +#define EP93XXFB_LUT_SW_CONTROL_SWTCH (1 << 0) +#define EP93XXFB_LUT_SW_CONTROL_SSTAT (1 << 1) +#define EP93XXFB_COLOR_LUT 0x0400 + +/* Video Signature Registers */ +#define EP93XXFB_VID_SIG_RSLT_VAL 0x0200 +#define EP93XXFB_VID_SIG_CTRL 0x0204 +#define EP93XXFB_VSIG 0x0208 +#define EP93XXFB_HSIG 0x020c +#define EP93XXFB_SIG_CLR_STR 0x0210 + +/* Minimum / Maximum resolutions supported */ +#define EP93XXFB_MIN_XRES 64 +#define EP93XXFB_MIN_YRES 64 +#define EP93XXFB_MAX_XRES 1024 +#define EP93XXFB_MAX_YRES 768 + +struct ep93xx_fbi { + struct ep93xxfb_mach_info *mach_info; + struct clk *clk; + struct resource *res; + void __iomem *mmio_base; + unsigned int pseudo_palette[256]; +}; + +static int check_screenpage_bug = 1; +module_param(check_screenpage_bug, int, 0644); +MODULE_PARM_DESC(check_screenpage_bug, + "Check for bit 27 screen page bug. Default = 1"); + +static inline unsigned int ep93xxfb_readl(struct ep93xx_fbi *fbi, + unsigned int off) +{ + return __raw_readl(fbi->mmio_base + off); +} + +static inline void ep93xxfb_writel(struct ep93xx_fbi *fbi, + unsigned int val, unsigned int off) +{ + __raw_writel(val, fbi->mmio_base + off); +} + +/* + * Write to one of the locked raster registers. + */ +static inline void ep93xxfb_out_locked(struct ep93xx_fbi *fbi, + unsigned int val, unsigned int reg) +{ + /* + * We don't need a lock or delay here since the raster register + * block will remain unlocked until the next access. + */ + ep93xxfb_writel(fbi, 0xaa, EP93XXFB_SWLOCK); + ep93xxfb_writel(fbi, val, reg); +} + +static void ep93xxfb_set_video_attribs(struct fb_info *info) +{ + struct ep93xx_fbi *fbi = info->par; + unsigned int attribs; + + attribs = EP93XXFB_ENABLE; + attribs |= fbi->mach_info->flags; + ep93xxfb_out_locked(fbi, attribs, EP93XXFB_ATTRIBS); +} + +static int ep93xxfb_set_pixelmode(struct fb_info *info) +{ + struct ep93xx_fbi *fbi = info->par; + unsigned int val; + + info->var.transp.offset = 0; + info->var.transp.length = 0; + + switch (info->var.bits_per_pixel) { + case 8: + val = EP93XXFB_PIXELMODE_8BPP | EP93XXFB_PIXELMODE_COLOR_LUT | + EP93XXFB_PIXELMODE_SHIFT_1P_18B; + + info->var.red.offset = 0; + info->var.red.length = 8; + info->var.green.offset = 0; + info->var.green.length = 8; + info->var.blue.offset = 0; + info->var.blue.length = 8; + info->fix.visual = FB_VISUAL_PSEUDOCOLOR; + break; + + case 16: + val = EP93XXFB_PIXELMODE_16BPP | EP93XXFB_PIXELMODE_COLOR_555 | + EP93XXFB_PIXELMODE_SHIFT_1P_18B; + + info->var.red.offset = 11; + info->var.red.length = 5; + info->var.green.offset = 5; + info->var.green.length = 6; + info->var.blue.offset = 0; + info->var.blue.length = 5; + info->fix.visual = FB_VISUAL_TRUECOLOR; + break; + + case 24: + val = EP93XXFB_PIXELMODE_24BPP | EP93XXFB_PIXELMODE_COLOR_888 | + EP93XXFB_PIXELMODE_SHIFT_1P_24B; + + info->var.red.offset = 16; + info->var.red.length = 8; + info->var.green.offset = 8; + info->var.green.length = 8; + info->var.blue.offset = 0; + info->var.blue.length = 8; + info->fix.visual = FB_VISUAL_TRUECOLOR; + break; + + case 32: + val = EP93XXFB_PIXELMODE_32BPP | EP93XXFB_PIXELMODE_COLOR_888 | + EP93XXFB_PIXELMODE_SHIFT_1P_24B; + + info->var.red.offset = 16; + info->var.red.length = 8; + info->var.green.offset = 8; + info->var.green.length = 8; + info->var.blue.offset = 0; + info->var.blue.length = 8; + info->fix.visual = FB_VISUAL_TRUECOLOR; + break; + + default: + return -EINVAL; + } + + ep93xxfb_writel(fbi, val, EP93XXFB_PIXELMODE); + return 0; +} + +static void ep93xxfb_set_timing(struct fb_info *info) +{ + struct ep93xx_fbi *fbi = info->par; + unsigned int vlines_total, hclks_total, start, stop; + + vlines_total = info->var.yres + info->var.upper_margin + + info->var.lower_margin + info->var.vsync_len - 1; + + hclks_total = info->var.xres + info->var.left_margin + + info->var.right_margin + info->var.hsync_len - 1; + + ep93xxfb_out_locked(fbi, vlines_total, EP93XXFB_VLINES_TOTAL); + ep93xxfb_out_locked(fbi, hclks_total, EP93XXFB_HCLKS_TOTAL); + + start = vlines_total; + stop = vlines_total - info->var.vsync_len; + ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VSYNC); + + start = vlines_total - info->var.vsync_len - info->var.upper_margin; + stop = info->var.lower_margin - 1; + ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VBLANK); + ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VACTIVE); + + start = vlines_total; + stop = vlines_total + 1; + ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_VCLK); + + start = hclks_total; + stop = hclks_total - info->var.hsync_len; + ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HSYNC); + + start = hclks_total - info->var.hsync_len - info->var.left_margin; + stop = info->var.right_margin - 1; + ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HBLANK); + ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HACTIVE); + + start = hclks_total; + stop = hclks_total; + ep93xxfb_out_locked(fbi, start | (stop << 16), EP93XXFB_HCLK); + + ep93xxfb_out_locked(fbi, 0x0, EP93XXFB_LINE_CARRY); +} + +static int ep93xxfb_set_par(struct fb_info *info) +{ + struct ep93xx_fbi *fbi = info->par; + + clk_set_rate(fbi->clk, 1000 * PICOS2KHZ(info->var.pixclock)); + + ep93xxfb_set_timing(info); + + info->fix.line_length = info->var.xres_virtual * + info->var.bits_per_pixel / 8; + + ep93xxfb_writel(fbi, info->fix.smem_start, EP93XXFB_SCREEN_PAGE); + ep93xxfb_writel(fbi, info->var.yres - 1, EP93XXFB_SCREEN_LINES); + ep93xxfb_writel(fbi, ((info->var.xres * info->var.bits_per_pixel) + / 32) - 1, EP93XXFB_LINE_LENGTH); + ep93xxfb_writel(fbi, info->fix.line_length / 4, EP93XXFB_VLINE_STEP); + ep93xxfb_set_video_attribs(info); + return 0; +} + +static int ep93xxfb_check_var(struct fb_var_screeninfo *var, + struct fb_info *info) +{ + int err; + + err = ep93xxfb_set_pixelmode(info); + if (err) + return err; + + var->xres = max_t(unsigned int, var->xres, EP93XXFB_MIN_XRES); + var->xres = min_t(unsigned int, var->xres, EP93XXFB_MAX_XRES); + var->xres_virtual = max(var->xres_virtual, var->xres); + + var->yres = max_t(unsigned int, var->yres, EP93XXFB_MIN_YRES); + var->yres = min_t(unsigned int, var->yres, EP93XXFB_MAX_YRES); + var->yres_virtual = max(var->yres_virtual, var->yres); + + return 0; +} + +static int ep93xxfb_mmap(struct fb_info *info, struct vm_area_struct *vma) +{ + unsigned int offset = vma->vm_pgoff << PAGE_SHIFT; + + if (offset < info->fix.smem_len) { + return dma_mmap_wc(info->device, vma, info->screen_base, + info->fix.smem_start, info->fix.smem_len); + } + + return -EINVAL; +} + +static int ep93xxfb_blank(int blank_mode, struct fb_info *info) +{ + struct ep93xx_fbi *fbi = info->par; + unsigned int attribs = ep93xxfb_readl(fbi, EP93XXFB_ATTRIBS); + + if (blank_mode) { + if (fbi->mach_info->blank) + fbi->mach_info->blank(blank_mode, info); + ep93xxfb_out_locked(fbi, attribs & ~EP93XXFB_ENABLE, + EP93XXFB_ATTRIBS); + clk_disable(fbi->clk); + } else { + clk_enable(fbi->clk); + ep93xxfb_out_locked(fbi, attribs | EP93XXFB_ENABLE, + EP93XXFB_ATTRIBS); + if (fbi->mach_info->blank) + fbi->mach_info->blank(blank_mode, info); + } + + return 0; +} + +static inline int ep93xxfb_convert_color(int val, int width) +{ + return ((val << width) + 0x7fff - val) >> 16; +} + +static int ep93xxfb_setcolreg(unsigned int regno, unsigned int red, + unsigned int green, unsigned int blue, + unsigned int transp, struct fb_info *info) +{ + struct ep93xx_fbi *fbi = info->par; + unsigned int *pal = info->pseudo_palette; + unsigned int ctrl, i, rgb, lut_current, lut_stat; + + switch (info->fix.visual) { + case FB_VISUAL_PSEUDOCOLOR: + if (regno > 255) + return 1; + rgb = ((red & 0xff00) << 8) | (green & 0xff00) | + ((blue & 0xff00) >> 8); + + pal[regno] = rgb; + ep93xxfb_writel(fbi, rgb, (EP93XXFB_COLOR_LUT + (regno << 2))); + ctrl = ep93xxfb_readl(fbi, EP93XXFB_LUT_SW_CONTROL); + lut_stat = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SSTAT); + lut_current = !!(ctrl & EP93XXFB_LUT_SW_CONTROL_SWTCH); + + if (lut_stat == lut_current) { + for (i = 0; i < 256; i++) { + ep93xxfb_writel(fbi, pal[i], + EP93XXFB_COLOR_LUT + (i << 2)); + } + + ep93xxfb_writel(fbi, + ctrl ^ EP93XXFB_LUT_SW_CONTROL_SWTCH, + EP93XXFB_LUT_SW_CONTROL); + } + break; + + case FB_VISUAL_TRUECOLOR: + if (regno > 16) + return 1; + + red = ep93xxfb_convert_color(red, info->var.red.length); + green = ep93xxfb_convert_color(green, info->var.green.length); + blue = ep93xxfb_convert_color(blue, info->var.blue.length); + transp = ep93xxfb_convert_color(transp, + info->var.transp.length); + + pal[regno] = (red << info->var.red.offset) | + (green << info->var.green.offset) | + (blue << info->var.blue.offset) | + (transp << info->var.transp.offset); + break; + + default: + return 1; + } + + return 0; +} + +static const struct fb_ops ep93xxfb_ops = { + .owner = THIS_MODULE, + .fb_check_var = ep93xxfb_check_var, + .fb_set_par = ep93xxfb_set_par, + .fb_blank = ep93xxfb_blank, + .fb_fillrect = cfb_fillrect, + .fb_copyarea = cfb_copyarea, + .fb_imageblit = cfb_imageblit, + .fb_setcolreg = ep93xxfb_setcolreg, + .fb_mmap = ep93xxfb_mmap, +}; + +static int ep93xxfb_alloc_videomem(struct fb_info *info) +{ + char __iomem *virt_addr; + dma_addr_t phys_addr; + unsigned int fb_size; + + /* Maximum 16bpp -> used memory is maximum x*y*2 bytes */ + fb_size = EP93XXFB_MAX_XRES * EP93XXFB_MAX_YRES * 2; + + virt_addr = dma_alloc_wc(info->device, fb_size, &phys_addr, GFP_KERNEL); + if (!virt_addr) + return -ENOMEM; + + /* + * There is a bug in the ep93xx framebuffer which causes problems + * if bit 27 of the physical address is set. + * See: https://marc.info/?l=linux-arm-kernel&m=110061245502000&w=2 + * There does not seem to be any official errata for this, but I + * have confirmed the problem exists on my hardware (ep9315) at + * least. + */ + if (check_screenpage_bug && phys_addr & (1 << 27)) { + fb_err(info, "ep93xx framebuffer bug. phys addr (0x%x) " + "has bit 27 set: cannot init framebuffer\n", + phys_addr); + + dma_free_coherent(info->device, fb_size, virt_addr, phys_addr); + return -ENOMEM; + } + + info->fix.smem_start = phys_addr; + info->fix.smem_len = fb_size; + info->screen_base = virt_addr; + + return 0; +} + +static void ep93xxfb_dealloc_videomem(struct fb_info *info) +{ + if (info->screen_base) + dma_free_coherent(info->device, info->fix.smem_len, + info->screen_base, info->fix.smem_start); +} + +static int ep93xxfb_probe(struct platform_device *pdev) +{ + struct ep93xxfb_mach_info *mach_info = dev_get_platdata(&pdev->dev); + struct fb_info *info; + struct ep93xx_fbi *fbi; + struct resource *res; + char *video_mode; + int err; + + if (!mach_info) + return -EINVAL; + + info = framebuffer_alloc(sizeof(struct ep93xx_fbi), &pdev->dev); + if (!info) + return -ENOMEM; + + platform_set_drvdata(pdev, info); + fbi = info->par; + fbi->mach_info = mach_info; + + err = fb_alloc_cmap(&info->cmap, 256, 0); + if (err) + goto failed_cmap; + + err = ep93xxfb_alloc_videomem(info); + if (err) + goto failed_videomem; + + res = platform_get_resource(pdev, IORESOURCE_MEM, 0); + if (!res) { + err = -ENXIO; + goto failed_resource; + } + + /* + * FIXME - We don't do a request_mem_region here because we are + * sharing the register space with the backlight driver (see + * drivers/video/backlight/ep93xx_bl.c) and doing so will cause + * the second loaded driver to return -EBUSY. + * + * NOTE: No locking is required; the backlight does not touch + * any of the framebuffer registers. + */ + fbi->res = res; + fbi->mmio_base = devm_ioremap(&pdev->dev, res->start, + resource_size(res)); + if (!fbi->mmio_base) { + err = -ENXIO; + goto failed_resource; + } + + strcpy(info->fix.id, pdev->name); + info->fbops = &ep93xxfb_ops; + info->fix.type = FB_TYPE_PACKED_PIXELS; + info->fix.accel = FB_ACCEL_NONE; + info->var.activate = FB_ACTIVATE_NOW; + info->var.vmode = FB_VMODE_NONINTERLACED; + info->node = -1; + info->state = FBINFO_STATE_RUNNING; + info->pseudo_palette = &fbi->pseudo_palette; + + fb_get_options("ep93xx-fb", &video_mode); + err = fb_find_mode(&info->var, info, video_mode, + NULL, 0, NULL, 16); + if (err == 0) { + fb_err(info, "No suitable video mode found\n"); + err = -EINVAL; + goto failed_resource; + } + + if (mach_info->setup) { + err = mach_info->setup(pdev); + if (err) + goto failed_resource; + } + + err = ep93xxfb_check_var(&info->var, info); + if (err) + goto failed_check; + + fbi->clk = devm_clk_get(&pdev->dev, NULL); + if (IS_ERR(fbi->clk)) { + err = PTR_ERR(fbi->clk); + fbi->clk = NULL; + goto failed_check; + } + + ep93xxfb_set_par(info); + err = clk_prepare_enable(fbi->clk); + if (err) + goto failed_check; + + err = register_framebuffer(info); + if (err) + goto failed_framebuffer; + + fb_info(info, "registered. Mode = %dx%d-%d\n", + info->var.xres, info->var.yres, info->var.bits_per_pixel); + return 0; + +failed_framebuffer: + clk_disable_unprepare(fbi->clk); +failed_check: + if (fbi->mach_info->teardown) + fbi->mach_info->teardown(pdev); +failed_resource: + ep93xxfb_dealloc_videomem(info); +failed_videomem: + fb_dealloc_cmap(&info->cmap); +failed_cmap: + kfree(info); + + return err; +} + +static void ep93xxfb_remove(struct platform_device *pdev) +{ + struct fb_info *info = platform_get_drvdata(pdev); + struct ep93xx_fbi *fbi = info->par; + + unregister_framebuffer(info); + clk_disable_unprepare(fbi->clk); + ep93xxfb_dealloc_videomem(info); + fb_dealloc_cmap(&info->cmap); + + if (fbi->mach_info->teardown) + fbi->mach_info->teardown(pdev); + + kfree(info); +} + +static struct platform_driver ep93xxfb_driver = { + .probe = ep93xxfb_probe, + .remove_new = ep93xxfb_remove, + .driver = { + .name = "ep93xx-fb", + }, +}; +module_platform_driver(ep93xxfb_driver); + +MODULE_DESCRIPTION("EP93XX Framebuffer Driver"); +MODULE_ALIAS("platform:ep93xx-fb"); +MODULE_AUTHOR("Ryan Mallon, " + "H Hartley Sweeten <hsweeten@visionengravers.com"); +MODULE_LICENSE("GPL"); |