/* * SH7760/SH7763 LCDC Framebuffer driver. * * (c) 2006-2008 MSC Vertriebsges.m.b.H., * Manuel Lauss <mano@roarinelk.homelinux.net> * (c) 2008 Nobuhiro Iwamatsu <iwamatsu.nobuhiro@renesas.com> * * This file is subject to the terms and conditions of the GNU General * Public License. See the file COPYING in the main directory of this * archive for more details. * * PLEASE HAVE A LOOK AT Documentation/fb/sh7760fb.txt! * * Thanks to Siegfried Schaefer <s.schaefer at schaefer-edv.de> * for his original source and testing! * * sh7760_setcolreg get from drivers/video/sh_mobile_lcdcfb.c */ #include <linux/completion.h> #include <linux/delay.h> #include <linux/dma-mapping.h> #include <linux/fb.h> #include <linux/interrupt.h> #include <linux/io.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/slab.h> #include <asm/sh7760fb.h> struct sh7760fb_par { void __iomem *base; int irq; struct sh7760fb_platdata *pd; /* display information */ dma_addr_t fbdma; /* physical address */ int rot; /* rotation enabled? */ u32 pseudo_palette[16]; struct platform_device *dev; struct resource *ioarea; struct completion vsync; /* vsync irq event */ }; static irqreturn_t sh7760fb_irq(int irq, void *data) { struct completion *c = data; complete(c); return IRQ_HANDLED; } /* wait_for_lps - wait until power supply has reached a certain state. */ static int wait_for_lps(struct sh7760fb_par *par, int val) { int i = 100; while (--i && ((ioread16(par->base + LDPMMR) & 3) != val)) msleep(1); if (i <= 0) return -ETIMEDOUT; return 0; } /* en/disable the LCDC */ static int sh7760fb_blank(int blank, struct fb_info *info) { struct sh7760fb_par *par = info->par; struct sh7760fb_platdata *pd = par->pd; unsigned short cntr = ioread16(par->base + LDCNTR); unsigned short intr = ioread16(par->base + LDINTR); int lps; if (blank == FB_BLANK_UNBLANK) { intr |= VINT_START; cntr = LDCNTR_DON2 | LDCNTR_DON; lps = 3; } else { intr &= ~VINT_START; cntr = LDCNTR_DON2; lps = 0; } if (pd->blank) pd->blank(blank); iowrite16(intr, par->base + LDINTR); iowrite16(cntr, par->base + LDCNTR); return wait_for_lps(par, lps); } static int sh7760_setcolreg (u_int regno, u_int red, u_int green, u_int blue, u_int transp, struct fb_info *info) { u32 *palette = info->pseudo_palette; if (regno >= 16) return -EINVAL; /* only FB_VISUAL_TRUECOLOR supported */ red >>= 16 - info->var.red.length; green >>= 16 - info->var.green.length; blue >>= 16 - info->var.blue.length; transp >>= 16 - info->var.transp.length; palette[regno] = (red << info->var.red.offset) | (green << info->var.green.offset) | (blue << info->var.blue.offset) | (transp << info->var.transp.offset); return 0; } static int sh7760fb_get_color_info(struct device *dev, u16 lddfr, int *bpp, int *gray) { int lbpp, lgray; lgray = lbpp = 0; switch (lddfr & LDDFR_COLOR_MASK) { case LDDFR_1BPP_MONO: lgray = 1; lbpp = 1; break; case LDDFR_2BPP_MONO: lgray = 1; lbpp = 2; break; case LDDFR_4BPP_MONO: lgray = 1; case LDDFR_4BPP: lbpp = 4; break; case LDDFR_6BPP_MONO: lgray = 1; case LDDFR_8BPP: lbpp = 8; break; case LDDFR_16BPP_RGB555: case LDDFR_16BPP_RGB565: lbpp = 16; lgray = 0; break; default: dev_dbg(dev, "unsupported LDDFR bit depth.\n"); return -EINVAL; } if (bpp) *bpp = lbpp; if (gray) *gray = lgray; return 0; } static int sh7760fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { struct fb_fix_screeninfo *fix = &info->fix; struct sh7760fb_par *par = info->par; int ret, bpp; /* get color info from register value */ ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL); if (ret) return ret; var->bits_per_pixel = bpp; if ((var->grayscale) && (var->bits_per_pixel == 1)) fix->visual = FB_VISUAL_MONO10; else if (var->bits_per_pixel >= 15) fix->visual = FB_VISUAL_TRUECOLOR; else fix->visual = FB_VISUAL_PSEUDOCOLOR; /* TODO: add some more validation here */ return 0; } /* * sh7760fb_set_par - set videomode. * * NOTE: The rotation, grayscale and DSTN codepaths are * totally untested! */ static int sh7760fb_set_par(struct fb_info *info) { struct sh7760fb_par *par = info->par; struct fb_videomode *vm = par->pd->def_mode; unsigned long sbase, dstn_off, ldsarl, stride; unsigned short hsynp, hsynw, htcn, hdcn; unsigned short vsynp, vsynw, vtln, vdln; unsigned short lddfr, ldmtr; int ret, bpp, gray; par->rot = par->pd->rotate; /* rotate only works with xres <= 320 */ if (par->rot && (vm->xres > 320)) { dev_dbg(info->dev, "rotation disabled due to display size\n"); par->rot = 0; } /* calculate LCDC reg vals from display parameters */ hsynp = vm->right_margin + vm->xres; hsynw = vm->hsync_len; htcn = vm->left_margin + hsynp + hsynw; hdcn = vm->xres; vsynp = vm->lower_margin + vm->yres; vsynw = vm->vsync_len; vtln = vm->upper_margin + vsynp + vsynw; vdln = vm->yres; /* get color info from register value */ ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, &gray); if (ret) return ret; dev_dbg(info->dev, "%dx%d %dbpp %s (orientation %s)\n", hdcn, vdln, bpp, gray ? "grayscale" : "color", par->rot ? "rotated" : "normal"); #ifdef CONFIG_CPU_LITTLE_ENDIAN lddfr = par->pd->lddfr | (1 << 8); #else lddfr = par->pd->lddfr & ~(1 << 8); #endif ldmtr = par->pd->ldmtr; if (!(vm->sync & FB_SYNC_HOR_HIGH_ACT)) ldmtr |= LDMTR_CL1POL; if (!(vm->sync & FB_SYNC_VERT_HIGH_ACT)) ldmtr |= LDMTR_FLMPOL; /* shut down LCDC before changing display parameters */ sh7760fb_blank(FB_BLANK_POWERDOWN, info); iowrite16(par->pd->ldickr, par->base + LDICKR); /* pixclock */ iowrite16(ldmtr, par->base + LDMTR); /* polarities */ iowrite16(lddfr, par->base + LDDFR); /* color/depth */ iowrite16((par->rot ? 1 << 13 : 0), par->base + LDSMR); /* rotate */ iowrite16(par->pd->ldpmmr, par->base + LDPMMR); /* Power Management */ iowrite16(par->pd->ldpspr, par->base + LDPSPR); /* Power Supply Ctrl */ /* display resolution */ iowrite16(((htcn >> 3) - 1) | (((hdcn >> 3) - 1) << 8), par->base + LDHCNR); iowrite16(vdln - 1, par->base + LDVDLNR); iowrite16(vtln - 1, par->base + LDVTLNR); /* h/v sync signals */ iowrite16((vsynp - 1) | ((vsynw - 1) << 12), par->base + LDVSYNR); iowrite16(((hsynp >> 3) - 1) | (((hsynw >> 3) - 1) << 12), par->base + LDHSYNR); /* AC modulation sig */ iowrite16(par->pd->ldaclnr, par->base + LDACLNR); stride = (par->rot) ? vtln : hdcn; if (!gray) stride *= (bpp + 7) >> 3; else { if (bpp == 1) stride >>= 3; else if (bpp == 2) stride >>= 2; else if (bpp == 4) stride >>= 1; /* 6 bpp == 8 bpp */ } /* if rotated, stride must be power of 2 */ if (par->rot) { unsigned long bit = 1 << 31; while (bit) { if (stride & bit) break; bit >>= 1; } if (stride & ~bit) stride = bit << 1; /* not P-o-2, round up */ } iowrite16(stride, par->base + LDLAOR); /* set display mem start address */ sbase = (unsigned long)par->fbdma; if (par->rot) sbase += (hdcn - 1) * stride; iowrite32(sbase, par->base + LDSARU); /* * for DSTN need to set address for lower half. * I (mlau) don't know which address to set it to, * so I guessed at (stride * yres/2). */ if (((ldmtr & 0x003f) >= LDMTR_DSTN_MONO_8) && ((ldmtr & 0x003f) <= LDMTR_DSTN_COLOR_16)) { dev_dbg(info->dev, " ***** DSTN untested! *****\n"); dstn_off = stride; if (par->rot) dstn_off *= hdcn >> 1; else dstn_off *= vdln >> 1; ldsarl = sbase + dstn_off; } else ldsarl = 0; iowrite32(ldsarl, par->base + LDSARL); /* mem for lower half of DSTN */ info->fix.line_length = stride; sh7760fb_check_var(&info->var, info); sh7760fb_blank(FB_BLANK_UNBLANK, info); /* panel on! */ dev_dbg(info->dev, "hdcn : %6d htcn : %6d\n", hdcn, htcn); dev_dbg(info->dev, "hsynw : %6d hsynp : %6d\n", hsynw, hsynp); dev_dbg(info->dev, "vdln : %6d vtln : %6d\n", vdln, vtln); dev_dbg(info->dev, "vsynw : %6d vsynp : %6d\n", vsynw, vsynp); dev_dbg(info->dev, "clksrc: %6d clkdiv: %6d\n", (par->pd->ldickr >> 12) & 3, par->pd->ldickr & 0x1f); dev_dbg(info->dev, "ldpmmr: 0x%04x ldpspr: 0x%04x\n", par->pd->ldpmmr, par->pd->ldpspr); dev_dbg(info->dev, "ldmtr : 0x%04x lddfr : 0x%04x\n", ldmtr, lddfr); dev_dbg(info->dev, "ldlaor: %ld\n", stride); dev_dbg(info->dev, "ldsaru: 0x%08lx ldsarl: 0x%08lx\n", sbase, ldsarl); return 0; } static struct fb_ops sh7760fb_ops = { .owner = THIS_MODULE, .fb_blank = sh7760fb_blank, .fb_check_var = sh7760fb_check_var, .fb_setcolreg = sh7760_setcolreg, .fb_set_par = sh7760fb_set_par, .fb_fillrect = cfb_fillrect, .fb_copyarea = cfb_copyarea, .fb_imageblit = cfb_imageblit, }; static void sh7760fb_free_mem(struct fb_info *info) { struct sh7760fb_par *par = info->par; if (!info->screen_base) return; dma_free_coherent(info->dev, info->screen_size, info->screen_base, par->fbdma); par->fbdma = 0; info->screen_base = NULL; info->screen_size = 0; } /* allocate the framebuffer memory. This memory must be in Area3, * (dictated by the DMA engine) and contiguous, at a 512 byte boundary. */ static int sh7760fb_alloc_mem(struct fb_info *info) { struct sh7760fb_par *par = info->par; void *fbmem; unsigned long vram; int ret, bpp; if (info->screen_base) return 0; /* get color info from register value */ ret = sh7760fb_get_color_info(info->dev, par->pd->lddfr, &bpp, NULL); if (ret) { printk(KERN_ERR "colinfo\n"); return ret; } /* min VRAM: xres_min = 16, yres_min = 1, bpp = 1: 2byte -> 1 page max VRAM: xres_max = 1024, yres_max = 1024, bpp = 16: 2MB */ vram = info->var.xres * info->var.yres; if (info->var.grayscale) { if (bpp == 1) vram >>= 3; else if (bpp == 2) vram >>= 2; else if (bpp == 4) vram >>= 1; } else if (bpp > 8) vram *= 2; if ((vram < 1) || (vram > 1024 * 2048)) { dev_dbg(info->dev, "too much VRAM required. Check settings\n"); return -ENODEV; } if (vram < PAGE_SIZE) vram = PAGE_SIZE; fbmem = dma_alloc_coherent(info->dev, vram, &par->fbdma, GFP_KERNEL); if (!fbmem) return -ENOMEM; if ((par->fbdma & SH7760FB_DMA_MASK) != SH7760FB_DMA_MASK) { sh7760fb_free_mem(info); dev_err(info->dev, "kernel gave me memory at 0x%08lx, which is" "unusable for the LCDC\n", (unsigned long)par->fbdma); return -ENOMEM; } info->screen_base = fbmem; info->screen_size = vram; info->fix.smem_start = (unsigned long)info->screen_base; info->fix.smem_len = info->screen_size; return 0; } static int sh7760fb_probe(struct platform_device *pdev) { struct fb_info *info; struct resource *res; struct sh7760fb_par *par; int ret; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (unlikely(res == NULL)) { dev_err(&pdev->dev, "invalid resource\n"); return -EINVAL; } info = framebuffer_alloc(sizeof(struct sh7760fb_par), &pdev->dev); if (!info) return -ENOMEM; par = info->par; par->dev = pdev; par->pd = pdev->dev.platform_data; if (!par->pd) { dev_dbg(info->dev, "no display setup data!\n"); ret = -ENODEV; goto out_fb; } par->ioarea = request_mem_region(res->start, resource_size(res), pdev->name); if (!par->ioarea) { dev_err(&pdev->dev, "mmio area busy\n"); ret = -EBUSY; goto out_fb; } par->base = ioremap_nocache(res->start, resource_size(res)); if (!par->base) { dev_err(&pdev->dev, "cannot remap\n"); ret = -ENODEV; goto out_res; } iowrite16(0, par->base + LDINTR); /* disable vsync irq */ par->irq = platform_get_irq(pdev, 0); if (par->irq >= 0) { ret = request_irq(par->irq, sh7760fb_irq, 0, "sh7760-lcdc", &par->vsync); if (ret) { dev_err(&pdev->dev, "cannot grab IRQ\n"); par->irq = -ENXIO; } else disable_irq_nosync(par->irq); } fb_videomode_to_var(&info->var, par->pd->def_mode); ret = sh7760fb_alloc_mem(info); if (ret) { dev_dbg(info->dev, "framebuffer memory allocation failed!\n"); goto out_unmap; } info->pseudo_palette = par->pseudo_palette; /* fixup color register bitpositions. These are fixed by hardware */ info->var.red.offset = 11; info->var.red.length = 5; info->var.red.msb_right = 0; info->var.green.offset = 5; info->var.green.length = 6; info->var.green.msb_right = 0; info->var.blue.offset = 0; info->var.blue.length = 5; info->var.blue.msb_right = 0; info->var.transp.offset = 0; info->var.transp.length = 0; info->var.transp.msb_right = 0; strcpy(info->fix.id, "sh7760-lcdc"); /* set the DON2 bit now, before cmap allocation, as it will randomize * palette memory. */ iowrite16(LDCNTR_DON2, par->base + LDCNTR); info->fbops = &sh7760fb_ops; ret = fb_alloc_cmap(&info->cmap, 256, 0); if (ret) { dev_dbg(info->dev, "Unable to allocate cmap memory\n"); goto out_mem; } ret = register_framebuffer(info); if (ret < 0) { dev_dbg(info->dev, "cannot register fb!\n"); goto out_cmap; } platform_set_drvdata(pdev, info); printk(KERN_INFO "%s: memory at phys 0x%08lx-0x%08lx, size %ld KiB\n", pdev->name, (unsigned long)par->fbdma, (unsigned long)(par->fbdma + info->screen_size - 1), info->screen_size >> 10); return 0; out_cmap: sh7760fb_blank(FB_BLANK_POWERDOWN, info); fb_dealloc_cmap(&info->cmap); out_mem: sh7760fb_free_mem(info); out_unmap: if (par->irq >= 0) free_irq(par->irq, &par->vsync); iounmap(par->base); out_res: release_mem_region(res->start, resource_size(res)); out_fb: framebuffer_release(info); return ret; } static int sh7760fb_remove(struct platform_device *dev) { struct fb_info *info = platform_get_drvdata(dev); struct sh7760fb_par *par = info->par; sh7760fb_blank(FB_BLANK_POWERDOWN, info); unregister_framebuffer(info); fb_dealloc_cmap(&info->cmap); sh7760fb_free_mem(info); if (par->irq >= 0) free_irq(par->irq, &par->vsync); iounmap(par->base); release_mem_region(par->ioarea->start, resource_size(par->ioarea)); framebuffer_release(info); return 0; } static struct platform_driver sh7760_lcdc_driver = { .driver = { .name = "sh7760-lcdc", .owner = THIS_MODULE, }, .probe = sh7760fb_probe, .remove = sh7760fb_remove, }; module_platform_driver(sh7760_lcdc_driver); MODULE_AUTHOR("Nobuhiro Iwamatsu, Manuel Lauss"); MODULE_DESCRIPTION("FBdev for SH7760/63 integrated LCD Controller"); MODULE_LICENSE("GPL");