/* * linux/drivers/video/imxfb.c * * Freescale i.MX Frame Buffer device driver * * Copyright (C) 2004 Sascha Hauer, Pengutronix * Based on acornfb.c Copyright (C) Russell King. * * 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 direct your questions and comments on this driver to the following * email address: * * linux-arm-kernel@lists.arm.linux.org.uk */ //#define DEBUG 1 #include <linux/config.h> #include <linux/module.h> #include <linux/kernel.h> #include <linux/sched.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/interrupt.h> #include <linux/slab.h> #include <linux/fb.h> #include <linux/delay.h> #include <linux/init.h> #include <linux/ioport.h> #include <linux/cpufreq.h> #include <linux/platform_device.h> #include <linux/dma-mapping.h> #include <asm/hardware.h> #include <asm/io.h> #include <asm/uaccess.h> #include <asm/arch/imxfb.h> /* * Complain if VAR is out of range. */ #define DEBUG_VAR 1 #include "imxfb.h" static struct imxfb_rgb def_rgb_16 = { .red = { .offset = 8, .length = 4, }, .green = { .offset = 4, .length = 4, }, .blue = { .offset = 0, .length = 4, }, .transp = { .offset = 0, .length = 0, }, }; static struct imxfb_rgb def_rgb_8 = { .red = { .offset = 0, .length = 8, }, .green = { .offset = 0, .length = 8, }, .blue = { .offset = 0, .length = 8, }, .transp = { .offset = 0, .length = 0, }, }; static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info); static inline u_int chan_to_field(u_int chan, struct fb_bitfield *bf) { chan &= 0xffff; chan >>= 16 - bf->length; return chan << bf->offset; } #define LCDC_PALETTE(x) __REG2(IMX_LCDC_BASE+0x800, (x)<<2) static int imxfb_setpalettereg(u_int regno, u_int red, u_int green, u_int blue, u_int trans, struct fb_info *info) { struct imxfb_info *fbi = info->par; u_int val, ret = 1; #define CNVT_TOHW(val,width) ((((val)<<(width))+0x7FFF-(val))>>16) if (regno < fbi->palette_size) { val = (CNVT_TOHW(red, 4) << 8) | (CNVT_TOHW(green,4) << 4) | CNVT_TOHW(blue, 4); LCDC_PALETTE(regno) = val; ret = 0; } return ret; } static int imxfb_setcolreg(u_int regno, u_int red, u_int green, u_int blue, u_int trans, struct fb_info *info) { struct imxfb_info *fbi = info->par; unsigned int val; int ret = 1; /* * If inverse mode was selected, invert all the colours * rather than the register number. The register number * is what you poke into the framebuffer to produce the * colour you requested. */ if (fbi->cmap_inverse) { red = 0xffff - red; green = 0xffff - green; blue = 0xffff - blue; } /* * If greyscale is true, then we convert the RGB value * to greyscale no mater what visual we are using. */ if (info->var.grayscale) red = green = blue = (19595 * red + 38470 * green + 7471 * blue) >> 16; switch (info->fix.visual) { case FB_VISUAL_TRUECOLOR: /* * 12 or 16-bit True Colour. We encode the RGB value * according to the RGB bitfield information. */ if (regno < 16) { u32 *pal = info->pseudo_palette; val = chan_to_field(red, &info->var.red); val |= chan_to_field(green, &info->var.green); val |= chan_to_field(blue, &info->var.blue); pal[regno] = val; ret = 0; } break; case FB_VISUAL_STATIC_PSEUDOCOLOR: case FB_VISUAL_PSEUDOCOLOR: ret = imxfb_setpalettereg(regno, red, green, blue, trans, info); break; } return ret; } /* * imxfb_check_var(): * Round up in the following order: bits_per_pixel, xres, * yres, xres_virtual, yres_virtual, xoffset, yoffset, grayscale, * bitfields, horizontal timing, vertical timing. */ static int imxfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { struct imxfb_info *fbi = info->par; int rgbidx; if (var->xres < MIN_XRES) var->xres = MIN_XRES; if (var->yres < MIN_YRES) var->yres = MIN_YRES; if (var->xres > fbi->max_xres) var->xres = fbi->max_xres; if (var->yres > fbi->max_yres) var->yres = fbi->max_yres; var->xres_virtual = max(var->xres_virtual, var->xres); var->yres_virtual = max(var->yres_virtual, var->yres); pr_debug("var->bits_per_pixel=%d\n", var->bits_per_pixel); switch (var->bits_per_pixel) { case 16: rgbidx = RGB_16; break; case 8: rgbidx = RGB_8; break; default: rgbidx = RGB_16; } /* * Copy the RGB parameters for this display * from the machine specific parameters. */ var->red = fbi->rgb[rgbidx]->red; var->green = fbi->rgb[rgbidx]->green; var->blue = fbi->rgb[rgbidx]->blue; var->transp = fbi->rgb[rgbidx]->transp; pr_debug("RGBT length = %d:%d:%d:%d\n", var->red.length, var->green.length, var->blue.length, var->transp.length); pr_debug("RGBT offset = %d:%d:%d:%d\n", var->red.offset, var->green.offset, var->blue.offset, var->transp.offset); return 0; } /* * imxfb_set_par(): * Set the user defined part of the display for the specified console */ static int imxfb_set_par(struct fb_info *info) { struct imxfb_info *fbi = info->par; struct fb_var_screeninfo *var = &info->var; pr_debug("set_par\n"); if (var->bits_per_pixel == 16) info->fix.visual = FB_VISUAL_TRUECOLOR; else if (!fbi->cmap_static) info->fix.visual = FB_VISUAL_PSEUDOCOLOR; else { /* * Some people have weird ideas about wanting static * pseudocolor maps. I suspect their user space * applications are broken. */ info->fix.visual = FB_VISUAL_STATIC_PSEUDOCOLOR; } info->fix.line_length = var->xres_virtual * var->bits_per_pixel / 8; fbi->palette_size = var->bits_per_pixel == 8 ? 256 : 16; imxfb_activate_var(var, info); return 0; } static void imxfb_enable_controller(struct imxfb_info *fbi) { pr_debug("Enabling LCD controller\n"); /* initialize LCDC */ LCDC_RMCR &= ~RMCR_LCDC_EN; /* just to be safe... */ LCDC_SSA = fbi->screen_dma; /* physical screen start address */ LCDC_VPW = VPW_VPW(fbi->max_xres * fbi->max_bpp / 8 / 4); LCDC_POS = 0x00000000; /* panning offset 0 (0 pixel offset) */ /* disable hardware cursor */ LCDC_CPOS &= ~(CPOS_CC0 | CPOS_CC1); LCDC_RMCR = RMCR_LCDC_EN; if(fbi->backlight_power) fbi->backlight_power(1); if(fbi->lcd_power) fbi->lcd_power(1); } static void imxfb_disable_controller(struct imxfb_info *fbi) { pr_debug("Disabling LCD controller\n"); if(fbi->backlight_power) fbi->backlight_power(0); if(fbi->lcd_power) fbi->lcd_power(0); LCDC_RMCR = 0; } static int imxfb_blank(int blank, struct fb_info *info) { struct imxfb_info *fbi = info->par; pr_debug("imxfb_blank: blank=%d\n", blank); switch (blank) { case FB_BLANK_POWERDOWN: case FB_BLANK_VSYNC_SUSPEND: case FB_BLANK_HSYNC_SUSPEND: case FB_BLANK_NORMAL: imxfb_disable_controller(fbi); break; case FB_BLANK_UNBLANK: imxfb_enable_controller(fbi); break; } return 0; } static struct fb_ops imxfb_ops = { .owner = THIS_MODULE, .fb_check_var = imxfb_check_var, .fb_set_par = imxfb_set_par, .fb_setcolreg = imxfb_setcolreg, .fb_fillrect = cfb_fillrect, .fb_copyarea = cfb_copyarea, .fb_imageblit = cfb_imageblit, .fb_blank = imxfb_blank, .fb_cursor = soft_cursor, /* FIXME: i.MX can do hardware cursor */ }; /* * imxfb_activate_var(): * Configures LCD Controller based on entries in var parameter. Settings are * only written to the controller if changes were made. */ static int imxfb_activate_var(struct fb_var_screeninfo *var, struct fb_info *info) { struct imxfb_info *fbi = info->par; pr_debug("var: xres=%d hslen=%d lm=%d rm=%d\n", var->xres, var->hsync_len, var->left_margin, var->right_margin); pr_debug("var: yres=%d vslen=%d um=%d bm=%d\n", var->yres, var->vsync_len, var->upper_margin, var->lower_margin); #if DEBUG_VAR if (var->xres < 16 || var->xres > 1024) printk(KERN_ERR "%s: invalid xres %d\n", info->fix.id, var->xres); if (var->hsync_len < 1 || var->hsync_len > 64) printk(KERN_ERR "%s: invalid hsync_len %d\n", info->fix.id, var->hsync_len); if (var->left_margin > 255) printk(KERN_ERR "%s: invalid left_margin %d\n", info->fix.id, var->left_margin); if (var->right_margin > 255) printk(KERN_ERR "%s: invalid right_margin %d\n", info->fix.id, var->right_margin); if (var->yres < 1 || var->yres > 511) printk(KERN_ERR "%s: invalid yres %d\n", info->fix.id, var->yres); if (var->vsync_len > 100) printk(KERN_ERR "%s: invalid vsync_len %d\n", info->fix.id, var->vsync_len); if (var->upper_margin > 63) printk(KERN_ERR "%s: invalid upper_margin %d\n", info->fix.id, var->upper_margin); if (var->lower_margin > 255) printk(KERN_ERR "%s: invalid lower_margin %d\n", info->fix.id, var->lower_margin); #endif LCDC_HCR = HCR_H_WIDTH(var->hsync_len) | HCR_H_WAIT_1(var->left_margin) | HCR_H_WAIT_2(var->right_margin); LCDC_VCR = VCR_V_WIDTH(var->vsync_len) | VCR_V_WAIT_1(var->upper_margin) | VCR_V_WAIT_2(var->lower_margin); LCDC_SIZE = SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres); LCDC_PCR = fbi->pcr; LCDC_PWMR = fbi->pwmr; LCDC_LSCR1 = fbi->lscr1; LCDC_DMACR = fbi->dmacr; return 0; } static void imxfb_setup_gpio(struct imxfb_info *fbi) { int width; LCDC_RMCR &= ~(RMCR_LCDC_EN | RMCR_SELF_REF); if( fbi->pcr & PCR_TFT ) width = 16; else width = 1 << ((fbi->pcr >> 28) & 0x3); switch(width) { case 16: imx_gpio_mode(PD30_PF_LD15); imx_gpio_mode(PD29_PF_LD14); imx_gpio_mode(PD28_PF_LD13); imx_gpio_mode(PD27_PF_LD12); imx_gpio_mode(PD26_PF_LD11); imx_gpio_mode(PD25_PF_LD10); imx_gpio_mode(PD24_PF_LD9); imx_gpio_mode(PD23_PF_LD8); case 8: imx_gpio_mode(PD22_PF_LD7); imx_gpio_mode(PD21_PF_LD6); imx_gpio_mode(PD20_PF_LD5); imx_gpio_mode(PD19_PF_LD4); case 4: imx_gpio_mode(PD18_PF_LD3); imx_gpio_mode(PD17_PF_LD2); case 2: imx_gpio_mode(PD16_PF_LD1); case 1: imx_gpio_mode(PD15_PF_LD0); } /* initialize GPIOs */ imx_gpio_mode(PD6_PF_LSCLK); imx_gpio_mode(PD10_PF_SPL_SPR); imx_gpio_mode(PD11_PF_CONTRAST); imx_gpio_mode(PD14_PF_FLM_VSYNC); imx_gpio_mode(PD13_PF_LP_HSYNC); imx_gpio_mode(PD7_PF_REV); imx_gpio_mode(PD8_PF_CLS); #ifndef CONFIG_MACH_PIMX1 /* on PiMX1 used as buffers enable signal */ imx_gpio_mode(PD9_PF_PS); #endif #ifndef CONFIG_MACH_MX1FS2 /* on mx1fs2 this pin is used to (de)activate the display, so we need * it as a normal gpio */ imx_gpio_mode(PD12_PF_ACD_OE); #endif } #ifdef CONFIG_PM /* * Power management hooks. Note that we won't be called from IRQ context, * unlike the blank functions above, so we may sleep. */ static int imxfb_suspend(struct device *dev, pm_message_t state) { struct imxfb_info *fbi = dev_get_drvdata(dev); pr_debug("%s\n",__FUNCTION__); imxfb_disable_controller(fbi); return 0; } static int imxfb_resume(struct device *dev) { struct imxfb_info *fbi = dev_get_drvdata(dev); pr_debug("%s\n",__FUNCTION__); imxfb_enable_controller(fbi); return 0; } #else #define imxfb_suspend NULL #define imxfb_resume NULL #endif static int __init imxfb_init_fbinfo(struct device *dev) { struct imxfb_mach_info *inf = dev->platform_data; struct fb_info *info = dev_get_drvdata(dev); struct imxfb_info *fbi = info->par; pr_debug("%s\n",__FUNCTION__); info->pseudo_palette = kmalloc( sizeof(u32) * 16, GFP_KERNEL); if (!info->pseudo_palette) return -ENOMEM; memset(fbi, 0, sizeof(struct imxfb_info)); fbi->dev = dev; strlcpy(info->fix.id, IMX_NAME, sizeof(info->fix.id)); info->fix.type = FB_TYPE_PACKED_PIXELS; info->fix.type_aux = 0; info->fix.xpanstep = 0; info->fix.ypanstep = 0; info->fix.ywrapstep = 0; info->fix.accel = FB_ACCEL_NONE; info->var.nonstd = 0; info->var.activate = FB_ACTIVATE_NOW; info->var.height = -1; info->var.width = -1; info->var.accel_flags = 0; info->var.vmode = FB_VMODE_NONINTERLACED; info->fbops = &imxfb_ops; info->flags = FBINFO_FLAG_DEFAULT; info->pseudo_palette = (fbi + 1); fbi->rgb[RGB_16] = &def_rgb_16; fbi->rgb[RGB_8] = &def_rgb_8; fbi->max_xres = inf->xres; info->var.xres = inf->xres; info->var.xres_virtual = inf->xres; fbi->max_yres = inf->yres; info->var.yres = inf->yres; info->var.yres_virtual = inf->yres; fbi->max_bpp = inf->bpp; info->var.bits_per_pixel = inf->bpp; info->var.pixclock = inf->pixclock; info->var.hsync_len = inf->hsync_len; info->var.left_margin = inf->left_margin; info->var.right_margin = inf->right_margin; info->var.vsync_len = inf->vsync_len; info->var.upper_margin = inf->upper_margin; info->var.lower_margin = inf->lower_margin; info->var.sync = inf->sync; info->var.grayscale = inf->cmap_greyscale; fbi->cmap_inverse = inf->cmap_inverse; fbi->pcr = inf->pcr; fbi->lscr1 = inf->lscr1; fbi->dmacr = inf->dmacr; fbi->pwmr = inf->pwmr; fbi->lcd_power = inf->lcd_power; fbi->backlight_power = inf->backlight_power; info->fix.smem_len = fbi->max_xres * fbi->max_yres * fbi->max_bpp / 8; return 0; } /* * Allocates the DRAM memory for the frame buffer. This buffer is * remapped into a non-cached, non-buffered, memory region to * allow pixel writes to occur without flushing the cache. * Once this area is remapped, all virtual memory access to the * video memory should occur at the new region. */ static int __init imxfb_map_video_memory(struct fb_info *info) { struct imxfb_info *fbi = info->par; fbi->map_size = PAGE_ALIGN(info->fix.smem_len); fbi->map_cpu = dma_alloc_writecombine(fbi->dev, fbi->map_size, &fbi->map_dma,GFP_KERNEL); if (fbi->map_cpu) { info->screen_base = fbi->map_cpu; fbi->screen_cpu = fbi->map_cpu; fbi->screen_dma = fbi->map_dma; info->fix.smem_start = fbi->screen_dma; } return fbi->map_cpu ? 0 : -ENOMEM; } static int __init imxfb_probe(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct imxfb_info *fbi; struct fb_info *info; struct imxfb_mach_info *inf; struct resource *res; int ret; printk("i.MX Framebuffer driver\n"); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if(!res) return -ENODEV; inf = dev->platform_data; if(!inf) { dev_err(dev,"No platform_data available\n"); return -ENOMEM; } info = framebuffer_alloc(sizeof(struct imxfb_info), dev); if(!info) return -ENOMEM; fbi = info->par; dev_set_drvdata(dev, info); ret = imxfb_init_fbinfo(dev); if( ret < 0 ) goto failed_init; res = request_mem_region(res->start, res->end - res->start + 1, "IMXFB"); if (!res) { ret = -EBUSY; goto failed_regs; } if (!inf->fixed_screen_cpu) { ret = imxfb_map_video_memory(info); if (ret) { dev_err(dev, "Failed to allocate video RAM: %d\n", ret); ret = -ENOMEM; goto failed_map; } } else { /* Fixed framebuffer mapping enables location of the screen in eSRAM */ fbi->map_cpu = inf->fixed_screen_cpu; fbi->map_dma = inf->fixed_screen_dma; info->screen_base = fbi->map_cpu; fbi->screen_cpu = fbi->map_cpu; fbi->screen_dma = fbi->map_dma; info->fix.smem_start = fbi->screen_dma; } /* * This makes sure that our colour bitfield * descriptors are correctly initialised. */ imxfb_check_var(&info->var, info); ret = fb_alloc_cmap(&info->cmap, 1<<info->var.bits_per_pixel, 0); if (ret < 0) goto failed_cmap; imxfb_setup_gpio(fbi); imxfb_set_par(info); ret = register_framebuffer(info); if (ret < 0) { dev_err(dev, "failed to register framebuffer\n"); goto failed_register; } imxfb_enable_controller(fbi); return 0; failed_register: fb_dealloc_cmap(&info->cmap); failed_cmap: if (!inf->fixed_screen_cpu) dma_free_writecombine(dev,fbi->map_size,fbi->map_cpu, fbi->map_dma); failed_map: kfree(info->pseudo_palette); failed_regs: release_mem_region(res->start, res->end - res->start); failed_init: dev_set_drvdata(dev, NULL); framebuffer_release(info); return ret; } static int imxfb_remove(struct device *dev) { struct platform_device *pdev = to_platform_device(dev); struct fb_info *info = dev_get_drvdata(dev); struct imxfb_info *fbi = info->par; struct resource *res; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); imxfb_disable_controller(fbi); unregister_framebuffer(info); fb_dealloc_cmap(&info->cmap); kfree(info->pseudo_palette); framebuffer_release(info); release_mem_region(res->start, res->end - res->start + 1); dev_set_drvdata(dev, NULL); return 0; } void imxfb_shutdown(struct device * dev) { struct fb_info *info = dev_get_drvdata(dev); struct imxfb_info *fbi = info->par; imxfb_disable_controller(fbi); } static struct device_driver imxfb_driver = { .name = "imx-fb", .bus = &platform_bus_type, .probe = imxfb_probe, .suspend = imxfb_suspend, .resume = imxfb_resume, .remove = imxfb_remove, .shutdown = imxfb_shutdown, }; int __init imxfb_init(void) { return driver_register(&imxfb_driver); } static void __exit imxfb_cleanup(void) { driver_unregister(&imxfb_driver); } module_init(imxfb_init); module_exit(imxfb_cleanup); MODULE_DESCRIPTION("Motorola i.MX framebuffer driver"); MODULE_AUTHOR("Sascha Hauer, Pengutronix"); MODULE_LICENSE("GPL");