/* * linux/drivers/video/amba-clcd.c * * Copyright (C) 2001 ARM Limited, by David A Rusling * Updated to 2.5, Deep Blue Solutions Ltd. * * 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. * * ARM PrimeCell PL110 Color LCD Controller */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/slab.h> #include <linux/delay.h> #include <linux/mm.h> #include <linux/fb.h> #include <linux/init.h> #include <linux/ioport.h> #include <linux/list.h> #include <linux/amba/bus.h> #include <linux/amba/clcd.h> #include <linux/clk.h> #include <asm/sizes.h> #define to_clcd(info) container_of(info, struct clcd_fb, fb) /* This is limited to 16 characters when displayed by X startup */ static const char *clcd_name = "CLCD FB"; /* * Unfortunately, the enable/disable functions may be called either from * process or IRQ context, and we _need_ to delay. This is _not_ good. */ static inline void clcdfb_sleep(unsigned int ms) { if (in_atomic()) { mdelay(ms); } else { msleep(ms); } } static inline void clcdfb_set_start(struct clcd_fb *fb) { unsigned long ustart = fb->fb.fix.smem_start; unsigned long lstart; ustart += fb->fb.var.yoffset * fb->fb.fix.line_length; lstart = ustart + fb->fb.var.yres * fb->fb.fix.line_length / 2; writel(ustart, fb->regs + CLCD_UBAS); writel(lstart, fb->regs + CLCD_LBAS); } static void clcdfb_disable(struct clcd_fb *fb) { u32 val; if (fb->board->disable) fb->board->disable(fb); val = readl(fb->regs + CLCD_CNTL); if (val & CNTL_LCDPWR) { val &= ~CNTL_LCDPWR; writel(val, fb->regs + CLCD_CNTL); clcdfb_sleep(20); } if (val & CNTL_LCDEN) { val &= ~CNTL_LCDEN; writel(val, fb->regs + CLCD_CNTL); } /* * Disable CLCD clock source. */ clk_disable(fb->clk); } static void clcdfb_enable(struct clcd_fb *fb, u32 cntl) { /* * Enable the CLCD clock source. */ clk_enable(fb->clk); /* * Bring up by first enabling.. */ cntl |= CNTL_LCDEN; writel(cntl, fb->regs + CLCD_CNTL); clcdfb_sleep(20); /* * and now apply power. */ cntl |= CNTL_LCDPWR; writel(cntl, fb->regs + CLCD_CNTL); /* * finally, enable the interface. */ if (fb->board->enable) fb->board->enable(fb); } static int clcdfb_set_bitfields(struct clcd_fb *fb, struct fb_var_screeninfo *var) { int ret = 0; memset(&var->transp, 0, sizeof(var->transp)); var->red.msb_right = 0; var->green.msb_right = 0; var->blue.msb_right = 0; switch (var->bits_per_pixel) { case 1: case 2: case 4: case 8: var->red.length = var->bits_per_pixel; var->red.offset = 0; var->green.length = var->bits_per_pixel; var->green.offset = 0; var->blue.length = var->bits_per_pixel; var->blue.offset = 0; break; case 16: var->red.length = 5; var->blue.length = 5; /* * Green length can be 5 or 6 depending whether * we're operating in RGB555 or RGB565 mode. */ if (var->green.length != 5 && var->green.length != 6) var->green.length = 6; break; case 32: if (fb->panel->cntl & CNTL_LCDTFT) { var->red.length = 8; var->green.length = 8; var->blue.length = 8; break; } default: ret = -EINVAL; break; } /* * >= 16bpp displays have separate colour component bitfields * encoded in the pixel data. Calculate their position from * the bitfield length defined above. */ if (ret == 0 && var->bits_per_pixel >= 16) { if (fb->panel->cntl & CNTL_BGR) { var->blue.offset = 0; var->green.offset = var->blue.offset + var->blue.length; var->red.offset = var->green.offset + var->green.length; } else { var->red.offset = 0; var->green.offset = var->red.offset + var->red.length; var->blue.offset = var->green.offset + var->green.length; } } return ret; } static int clcdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { struct clcd_fb *fb = to_clcd(info); int ret = -EINVAL; if (fb->board->check) ret = fb->board->check(fb, var); if (ret == 0 && var->xres_virtual * var->bits_per_pixel / 8 * var->yres_virtual > fb->fb.fix.smem_len) ret = -EINVAL; if (ret == 0) ret = clcdfb_set_bitfields(fb, var); return ret; } static int clcdfb_set_par(struct fb_info *info) { struct clcd_fb *fb = to_clcd(info); struct clcd_regs regs; fb->fb.fix.line_length = fb->fb.var.xres_virtual * fb->fb.var.bits_per_pixel / 8; if (fb->fb.var.bits_per_pixel <= 8) fb->fb.fix.visual = FB_VISUAL_PSEUDOCOLOR; else fb->fb.fix.visual = FB_VISUAL_TRUECOLOR; fb->board->decode(fb, ®s); clcdfb_disable(fb); writel(regs.tim0, fb->regs + CLCD_TIM0); writel(regs.tim1, fb->regs + CLCD_TIM1); writel(regs.tim2, fb->regs + CLCD_TIM2); writel(regs.tim3, fb->regs + CLCD_TIM3); clcdfb_set_start(fb); clk_set_rate(fb->clk, (1000000000 / regs.pixclock) * 1000); fb->clcd_cntl = regs.cntl; clcdfb_enable(fb, regs.cntl); #ifdef DEBUG printk(KERN_INFO "CLCD: Registers set to\n" KERN_INFO " %08x %08x %08x %08x\n" KERN_INFO " %08x %08x %08x %08x\n", readl(fb->regs + CLCD_TIM0), readl(fb->regs + CLCD_TIM1), readl(fb->regs + CLCD_TIM2), readl(fb->regs + CLCD_TIM3), readl(fb->regs + CLCD_UBAS), readl(fb->regs + CLCD_LBAS), readl(fb->regs + CLCD_IENB), readl(fb->regs + CLCD_CNTL)); #endif return 0; } static inline u32 convert_bitfield(int val, struct fb_bitfield *bf) { unsigned int mask = (1 << bf->length) - 1; return (val >> (16 - bf->length) & mask) << bf->offset; } /* * Set a single color register. The values supplied have a 16 bit * magnitude. Return != 0 for invalid regno. */ static int clcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green, unsigned int blue, unsigned int transp, struct fb_info *info) { struct clcd_fb *fb = to_clcd(info); if (regno < 16) fb->cmap[regno] = convert_bitfield(transp, &fb->fb.var.transp) | convert_bitfield(blue, &fb->fb.var.blue) | convert_bitfield(green, &fb->fb.var.green) | convert_bitfield(red, &fb->fb.var.red); if (fb->fb.fix.visual == FB_VISUAL_PSEUDOCOLOR && regno < 256) { int hw_reg = CLCD_PALETTE + ((regno * 2) & ~3); u32 val, mask, newval; newval = (red >> 11) & 0x001f; newval |= (green >> 6) & 0x03e0; newval |= (blue >> 1) & 0x7c00; /* * 3.2.11: if we're configured for big endian * byte order, the palette entries are swapped. */ if (fb->clcd_cntl & CNTL_BEBO) regno ^= 1; if (regno & 1) { newval <<= 16; mask = 0x0000ffff; } else { mask = 0xffff0000; } val = readl(fb->regs + hw_reg) & mask; writel(val | newval, fb->regs + hw_reg); } return regno > 255; } /* * Blank the screen if blank_mode != 0, else unblank. If blank == NULL * then the caller blanks by setting the CLUT (Color Look Up Table) to all * black. Return 0 if blanking succeeded, != 0 if un-/blanking failed due * to e.g. a video mode which doesn't support it. Implements VESA suspend * and powerdown modes on hardware that supports disabling hsync/vsync: * blank_mode == 2: suspend vsync * blank_mode == 3: suspend hsync * blank_mode == 4: powerdown */ static int clcdfb_blank(int blank_mode, struct fb_info *info) { struct clcd_fb *fb = to_clcd(info); if (blank_mode != 0) { clcdfb_disable(fb); } else { clcdfb_enable(fb, fb->clcd_cntl); } return 0; } static int clcdfb_mmap(struct fb_info *info, struct vm_area_struct *vma) { struct clcd_fb *fb = to_clcd(info); unsigned long len, off = vma->vm_pgoff << PAGE_SHIFT; int ret = -EINVAL; len = info->fix.smem_len; if (off <= len && vma->vm_end - vma->vm_start <= len - off && fb->board->mmap) ret = fb->board->mmap(fb, vma); return ret; } static struct fb_ops clcdfb_ops = { .owner = THIS_MODULE, .fb_check_var = clcdfb_check_var, .fb_set_par = clcdfb_set_par, .fb_setcolreg = clcdfb_setcolreg, .fb_blank = clcdfb_blank, .fb_fillrect = cfb_fillrect, .fb_copyarea = cfb_copyarea, .fb_imageblit = cfb_imageblit, .fb_mmap = clcdfb_mmap, }; static int clcdfb_register(struct clcd_fb *fb) { int ret; fb->clk = clk_get(&fb->dev->dev, "CLCDCLK"); if (IS_ERR(fb->clk)) { ret = PTR_ERR(fb->clk); goto out; } fb->fb.fix.mmio_start = fb->dev->res.start; fb->fb.fix.mmio_len = SZ_4K; fb->regs = ioremap(fb->fb.fix.mmio_start, fb->fb.fix.mmio_len); if (!fb->regs) { printk(KERN_ERR "CLCD: unable to remap registers\n"); ret = -ENOMEM; goto free_clk; } fb->fb.fbops = &clcdfb_ops; fb->fb.flags = FBINFO_FLAG_DEFAULT; fb->fb.pseudo_palette = fb->cmap; strncpy(fb->fb.fix.id, clcd_name, sizeof(fb->fb.fix.id)); fb->fb.fix.type = FB_TYPE_PACKED_PIXELS; fb->fb.fix.type_aux = 0; fb->fb.fix.xpanstep = 0; fb->fb.fix.ypanstep = 0; fb->fb.fix.ywrapstep = 0; fb->fb.fix.accel = FB_ACCEL_NONE; fb->fb.var.xres = fb->panel->mode.xres; fb->fb.var.yres = fb->panel->mode.yres; fb->fb.var.xres_virtual = fb->panel->mode.xres; fb->fb.var.yres_virtual = fb->panel->mode.yres; fb->fb.var.bits_per_pixel = fb->panel->bpp; fb->fb.var.grayscale = fb->panel->grayscale; fb->fb.var.pixclock = fb->panel->mode.pixclock; fb->fb.var.left_margin = fb->panel->mode.left_margin; fb->fb.var.right_margin = fb->panel->mode.right_margin; fb->fb.var.upper_margin = fb->panel->mode.upper_margin; fb->fb.var.lower_margin = fb->panel->mode.lower_margin; fb->fb.var.hsync_len = fb->panel->mode.hsync_len; fb->fb.var.vsync_len = fb->panel->mode.vsync_len; fb->fb.var.sync = fb->panel->mode.sync; fb->fb.var.vmode = fb->panel->mode.vmode; fb->fb.var.activate = FB_ACTIVATE_NOW; fb->fb.var.nonstd = 0; fb->fb.var.height = fb->panel->height; fb->fb.var.width = fb->panel->width; fb->fb.var.accel_flags = 0; fb->fb.monspecs.hfmin = 0; fb->fb.monspecs.hfmax = 100000; fb->fb.monspecs.vfmin = 0; fb->fb.monspecs.vfmax = 400; fb->fb.monspecs.dclkmin = 1000000; fb->fb.monspecs.dclkmax = 100000000; /* * Make sure that the bitfields are set appropriately. */ clcdfb_set_bitfields(fb, &fb->fb.var); /* * Allocate colourmap. */ fb_alloc_cmap(&fb->fb.cmap, 256, 0); /* * Ensure interrupts are disabled. */ writel(0, fb->regs + CLCD_IENB); fb_set_var(&fb->fb, &fb->fb.var); printk(KERN_INFO "CLCD: %s hardware, %s display\n", fb->board->name, fb->panel->mode.name); ret = register_framebuffer(&fb->fb); if (ret == 0) goto out; printk(KERN_ERR "CLCD: cannot register framebuffer (%d)\n", ret); iounmap(fb->regs); free_clk: clk_put(fb->clk); out: return ret; } static int clcdfb_probe(struct amba_device *dev, void *id) { struct clcd_board *board = dev->dev.platform_data; struct clcd_fb *fb; int ret; if (!board) return -EINVAL; ret = amba_request_regions(dev, NULL); if (ret) { printk(KERN_ERR "CLCD: unable to reserve regs region\n"); goto out; } fb = kzalloc(sizeof(struct clcd_fb), GFP_KERNEL); if (!fb) { printk(KERN_INFO "CLCD: could not allocate new clcd_fb struct\n"); ret = -ENOMEM; goto free_region; } fb->dev = dev; fb->board = board; ret = fb->board->setup(fb); if (ret) goto free_fb; ret = clcdfb_register(fb); if (ret == 0) { amba_set_drvdata(dev, fb); goto out; } fb->board->remove(fb); free_fb: kfree(fb); free_region: amba_release_regions(dev); out: return ret; } static int clcdfb_remove(struct amba_device *dev) { struct clcd_fb *fb = amba_get_drvdata(dev); amba_set_drvdata(dev, NULL); clcdfb_disable(fb); unregister_framebuffer(&fb->fb); iounmap(fb->regs); clk_put(fb->clk); fb->board->remove(fb); kfree(fb); amba_release_regions(dev); return 0; } static struct amba_id clcdfb_id_table[] = { { .id = 0x00041110, .mask = 0x000ffffe, }, { 0, 0 }, }; static struct amba_driver clcd_driver = { .drv = { .name = "clcd-pl11x", }, .probe = clcdfb_probe, .remove = clcdfb_remove, .id_table = clcdfb_id_table, }; static int __init amba_clcdfb_init(void) { if (fb_get_options("ambafb", NULL)) return -ENODEV; return amba_driver_register(&clcd_driver); } module_init(amba_clcdfb_init); static void __exit amba_clcdfb_exit(void) { amba_driver_unregister(&clcd_driver); } module_exit(amba_clcdfb_exit); MODULE_DESCRIPTION("ARM PrimeCell PL110 CLCD core driver"); MODULE_LICENSE("GPL");