/* * 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 */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/interrupt.h> #include <linux/slab.h> #include <linux/mm.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 <linux/io.h> #include <mach/imxfb.h> /* * Complain if VAR is out of range. */ #define DEBUG_VAR 1 #define DRIVER_NAME "imx-fb" #define LCDC_SSA 0x00 #define LCDC_SIZE 0x04 #define SIZE_XMAX(x) ((((x) >> 4) & 0x3f) << 20) #define SIZE_YMAX(y) ((y) & 0x1ff) #define LCDC_VPW 0x08 #define VPW_VPW(x) ((x) & 0x3ff) #define LCDC_CPOS 0x0C #define CPOS_CC1 (1<<31) #define CPOS_CC0 (1<<30) #define CPOS_OP (1<<28) #define CPOS_CXP(x) (((x) & 3ff) << 16) #define CPOS_CYP(y) ((y) & 0x1ff) #define LCDC_LCWHB 0x10 #define LCWHB_BK_EN (1<<31) #define LCWHB_CW(w) (((w) & 0x1f) << 24) #define LCWHB_CH(h) (((h) & 0x1f) << 16) #define LCWHB_BD(x) ((x) & 0xff) #define LCDC_LCHCC 0x14 #define LCHCC_CUR_COL_R(r) (((r) & 0x1f) << 11) #define LCHCC_CUR_COL_G(g) (((g) & 0x3f) << 5) #define LCHCC_CUR_COL_B(b) ((b) & 0x1f) #define LCDC_PCR 0x18 #define LCDC_HCR 0x1C #define HCR_H_WIDTH(x) (((x) & 0x3f) << 26) #define HCR_H_WAIT_1(x) (((x) & 0xff) << 8) #define HCR_H_WAIT_2(x) ((x) & 0xff) #define LCDC_VCR 0x20 #define VCR_V_WIDTH(x) (((x) & 0x3f) << 26) #define VCR_V_WAIT_1(x) (((x) & 0xff) << 8) #define VCR_V_WAIT_2(x) ((x) & 0xff) #define LCDC_POS 0x24 #define POS_POS(x) ((x) & 1f) #define LCDC_LSCR1 0x28 /* bit fields in imxfb.h */ #define LCDC_PWMR 0x2C /* bit fields in imxfb.h */ #define LCDC_DMACR 0x30 /* bit fields in imxfb.h */ #define LCDC_RMCR 0x34 #define RMCR_LCDC_EN (1<<1) #define RMCR_SELF_REF (1<<0) #define LCDC_LCDICR 0x38 #define LCDICR_INT_SYN (1<<2) #define LCDICR_INT_CON (1) #define LCDC_LCDISR 0x40 #define LCDISR_UDR_ERR (1<<3) #define LCDISR_ERR_RES (1<<2) #define LCDISR_EOF (1<<1) #define LCDISR_BOF (1<<0) /* * These are the bitfields for each * display depth that we support. */ struct imxfb_rgb { struct fb_bitfield red; struct fb_bitfield green; struct fb_bitfield blue; struct fb_bitfield transp; }; struct imxfb_info { struct platform_device *pdev; void __iomem *regs; u_int max_bpp; u_int max_xres; u_int max_yres; /* * These are the addresses we mapped * the framebuffer memory region to. */ dma_addr_t map_dma; u_char *map_cpu; u_int map_size; u_char *screen_cpu; dma_addr_t screen_dma; u_int palette_size; dma_addr_t dbar1; dma_addr_t dbar2; u_int pcr; u_int pwmr; u_int lscr1; u_int dmacr; u_int cmap_inverse:1, cmap_static:1, unused:30; void (*lcd_power)(int); void (*backlight_power)(int); }; #define IMX_NAME "IMX" /* * Minimum X and Y resolutions */ #define MIN_XRES 64 #define MIN_YRES 64 static struct imxfb_rgb def_rgb_16_tft = { .red = {.offset = 11, .length = 5,}, .green = {.offset = 5, .length = 6,}, .blue = {.offset = 0, .length = 5,}, .transp = {.offset = 0, .length = 0,}, }; static struct imxfb_rgb def_rgb_16_stn = { .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; } 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); writel(val, fbi->regs + 0x800 + (regno << 2)); 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; struct imxfb_rgb *rgb; 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: default: if (readl(fbi->regs + LCDC_PCR) & PCR_TFT) rgb = &def_rgb_16_tft; else rgb = &def_rgb_16_stn; break; case 8: rgb = &def_rgb_8; break; } /* * Copy the RGB parameters for this display * from the machine specific parameters. */ var->red = rgb->red; var->green = rgb->green; var->blue = rgb->blue; var->transp = rgb->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 */ writel(readl(fbi->regs + LCDC_RMCR) & ~RMCR_LCDC_EN, fbi->regs + LCDC_RMCR); /* just to be safe... */ writel(fbi->screen_dma, fbi->regs + LCDC_SSA); /* physical screen start address */ writel(VPW_VPW(fbi->max_xres * fbi->max_bpp / 8 / 4), fbi->regs + LCDC_VPW); /* panning offset 0 (0 pixel offset) */ writel(0x00000000, fbi->regs + LCDC_POS); /* disable hardware cursor */ writel(readl(fbi->regs + LCDC_CPOS) & ~(CPOS_CC0 | CPOS_CC1), fbi->regs + LCDC_CPOS); writel(RMCR_LCDC_EN, fbi->regs + LCDC_RMCR); 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); writel(0, fbi->regs + LCDC_RMCR); } 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, }; /* * 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 writel(HCR_H_WIDTH(var->hsync_len) | HCR_H_WAIT_1(var->right_margin) | HCR_H_WAIT_2(var->left_margin), fbi->regs + LCDC_HCR); writel(VCR_V_WIDTH(var->vsync_len) | VCR_V_WAIT_1(var->lower_margin) | VCR_V_WAIT_2(var->upper_margin), fbi->regs + LCDC_VCR); writel(SIZE_XMAX(var->xres) | SIZE_YMAX(var->yres), fbi->regs + LCDC_SIZE); writel(fbi->pcr, fbi->regs + LCDC_PCR); writel(fbi->pwmr, fbi->regs + LCDC_PWMR); writel(fbi->lscr1, fbi->regs + LCDC_LSCR1); writel(fbi->dmacr, fbi->regs + LCDC_DMACR); return 0; } #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 platform_device *dev, pm_message_t state) { struct imxfb_info *fbi = platform_get_drvdata(dev); pr_debug("%s\n", __func__); imxfb_disable_controller(fbi); return 0; } static int imxfb_resume(struct platform_device *dev) { struct imxfb_info *fbi = platform_get_drvdata(dev); pr_debug("%s\n", __func__); imxfb_enable_controller(fbi); return 0; } #else #define imxfb_suspend NULL #define imxfb_resume NULL #endif static int __init imxfb_init_fbinfo(struct platform_device *pdev) { struct imx_fb_platform_data *pdata = pdev->dev.platform_data; struct fb_info *info = dev_get_drvdata(&pdev->dev); struct imxfb_info *fbi = info->par; pr_debug("%s\n",__func__); info->pseudo_palette = kmalloc(sizeof(u32) * 16, GFP_KERNEL); if (!info->pseudo_palette) return -ENOMEM; memset(fbi, 0, sizeof(struct imxfb_info)); 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 | FBINFO_READS_FAST; fbi->max_xres = pdata->xres; info->var.xres = pdata->xres; info->var.xres_virtual = pdata->xres; fbi->max_yres = pdata->yres; info->var.yres = pdata->yres; info->var.yres_virtual = pdata->yres; fbi->max_bpp = pdata->bpp; info->var.bits_per_pixel = pdata->bpp; info->var.nonstd = pdata->nonstd; info->var.pixclock = pdata->pixclock; info->var.hsync_len = pdata->hsync_len; info->var.left_margin = pdata->left_margin; info->var.right_margin = pdata->right_margin; info->var.vsync_len = pdata->vsync_len; info->var.upper_margin = pdata->upper_margin; info->var.lower_margin = pdata->lower_margin; info->var.sync = pdata->sync; info->var.grayscale = pdata->cmap_greyscale; fbi->cmap_inverse = pdata->cmap_inverse; fbi->cmap_static = pdata->cmap_static; fbi->pcr = pdata->pcr; fbi->lscr1 = pdata->lscr1; fbi->dmacr = pdata->dmacr; fbi->pwmr = pdata->pwmr; fbi->lcd_power = pdata->lcd_power; fbi->backlight_power = pdata->backlight_power; info->fix.smem_len = fbi->max_xres * fbi->max_yres * fbi->max_bpp / 8; return 0; } static int __init imxfb_probe(struct platform_device *pdev) { struct imxfb_info *fbi; struct fb_info *info; struct imx_fb_platform_data *pdata; struct resource *res; int ret; printk("i.MX Framebuffer driver\n"); res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -ENODEV; pdata = pdev->dev.platform_data; if (!pdata) { dev_err(&pdev->dev,"No platform_data available\n"); return -ENOMEM; } info = framebuffer_alloc(sizeof(struct imxfb_info), &pdev->dev); if (!info) return -ENOMEM; fbi = info->par; platform_set_drvdata(pdev, info); ret = imxfb_init_fbinfo(pdev); if (ret < 0) goto failed_init; res = request_mem_region(res->start, resource_size(res), DRIVER_NAME); if (!res) { ret = -EBUSY; goto failed_req; } fbi->regs = ioremap(res->start, resource_size(res)); if (fbi->regs == NULL) { printk(KERN_ERR"Cannot map frame buffer registers\n"); goto failed_ioremap; } if (!pdata->fixed_screen_cpu) { fbi->map_size = PAGE_ALIGN(info->fix.smem_len); fbi->map_cpu = dma_alloc_writecombine(&pdev->dev, fbi->map_size, &fbi->map_dma, GFP_KERNEL); if (!fbi->map_cpu) { dev_err(&pdev->dev, "Failed to allocate video RAM: %d\n", ret); ret = -ENOMEM; goto failed_map; } 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; } else { /* Fixed framebuffer mapping enables location of the screen in eSRAM */ fbi->map_cpu = pdata->fixed_screen_cpu; fbi->map_dma = pdata->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_set_par(info); ret = register_framebuffer(info); if (ret < 0) { dev_err(&pdev->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 (!pdata->fixed_screen_cpu) dma_free_writecombine(&pdev->dev,fbi->map_size,fbi->map_cpu, fbi->map_dma); failed_map: iounmap(fbi->regs); failed_ioremap: release_mem_region(res->start, res->end - res->start); failed_req: kfree(info->pseudo_palette); failed_init: platform_set_drvdata(pdev, NULL); framebuffer_release(info); return ret; } static int __devexit imxfb_remove(struct platform_device *pdev) { struct fb_info *info = platform_get_drvdata(pdev); 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); iounmap(fbi->regs); release_mem_region(res->start, res->end - res->start + 1); platform_set_drvdata(pdev, NULL); return 0; } void imxfb_shutdown(struct platform_device * dev) { struct fb_info *info = platform_get_drvdata(dev); struct imxfb_info *fbi = info->par; imxfb_disable_controller(fbi); } static struct platform_driver imxfb_driver = { .suspend = imxfb_suspend, .resume = imxfb_resume, .remove = __devexit_p(imxfb_remove), .shutdown = imxfb_shutdown, .driver = { .name = DRIVER_NAME, }, }; int __init imxfb_init(void) { return platform_driver_probe(&imxfb_driver, imxfb_probe); } static void __exit imxfb_cleanup(void) { platform_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");