/* * 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/clk.h> #include <linux/platform_device.h> #include <linux/dma-mapping.h> #include <linux/io.h> #include <linux/math64.h> #include <linux/of.h> #include <linux/of_device.h> #include <video/of_display_timing.h> #include <video/of_videomode.h> #include <video/videomode.h> #include <linux/platform_data/video-imxfb.h> /* * Complain if VAR is out of range. */ #define DEBUG_VAR 1 #if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || \ (defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE) && \ defined(CONFIG_FB_IMX_MODULE)) #define PWMR_BACKLIGHT_AVAILABLE #endif #define DRIVER_NAME "imx-fb" #define LCDC_SSA 0x00 #define LCDC_SIZE 0x04 #define SIZE_XMAX(x) ((((x) >> 4) & 0x3f) << 20) #define YMAX_MASK_IMX1 0x1ff #define YMAX_MASK_IMX21 0x3ff #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 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 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_MX1 (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) #define IMXFB_LSCR1_DEFAULT 0x00120300 /* Used fb-mode. Can be set on kernel command line, therefore file-static. */ static const char *fb_mode; /* * 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; }; enum imxfb_type { IMX1_FB, IMX21_FB, }; struct imxfb_info { struct platform_device *pdev; void __iomem *regs; struct clk *clk_ipg; struct clk *clk_ahb; struct clk *clk_per; enum imxfb_type devtype; bool enabled; /* * 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; struct imx_fb_videomode *mode; int num_modes; #ifdef PWMR_BACKLIGHT_AVAILABLE struct backlight_device *bl; #endif void (*lcd_power)(int); void (*backlight_power)(int); }; static struct platform_device_id imxfb_devtype[] = { { .name = "imx1-fb", .driver_data = IMX1_FB, }, { .name = "imx21-fb", .driver_data = IMX21_FB, }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(platform, imxfb_devtype); static struct of_device_id imxfb_of_dev_id[] = { { .compatible = "fsl,imx1-fb", .data = &imxfb_devtype[IMX1_FB], }, { .compatible = "fsl,imx21-fb", .data = &imxfb_devtype[IMX21_FB], }, { /* sentinel */ } }; MODULE_DEVICE_TABLE(of, imxfb_of_dev_id); static inline int is_imx1_fb(struct imxfb_info *fbi) { return fbi->devtype == IMX1_FB; } #define IMX_NAME "IMX" /* * Minimum X and Y resolutions */ #define MIN_XRES 64 #define MIN_YRES 64 /* Actually this really is 18bit support, the lowest 2 bits of each colour * are unused in hardware. We claim to have 24bit support to make software * like X work, which does not support 18bit. */ static struct imxfb_rgb def_rgb_18 = { .red = {.offset = 16, .length = 8,}, .green = {.offset = 8, .length = 8,}, .blue = {.offset = 0, .length = 8,}, .transp = {.offset = 0, .length = 0,}, }; 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; } static const struct imx_fb_videomode *imxfb_find_mode(struct imxfb_info *fbi) { struct imx_fb_videomode *m; int i; if (!fb_mode) return &fbi->mode[0]; for (i = 0, m = &fbi->mode[0]; i < fbi->num_modes; i++, m++) { if (!strcmp(m->mode.name, fb_mode)) return m; } return NULL; } /* * 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; const struct imx_fb_videomode *imxfb_mode; unsigned long lcd_clk; unsigned long long tmp; u32 pcr = 0; if (var->xres < MIN_XRES) var->xres = MIN_XRES; if (var->yres < MIN_YRES) var->yres = MIN_YRES; imxfb_mode = imxfb_find_mode(fbi); if (!imxfb_mode) return -EINVAL; var->xres = imxfb_mode->mode.xres; var->yres = imxfb_mode->mode.yres; var->bits_per_pixel = imxfb_mode->bpp; var->pixclock = imxfb_mode->mode.pixclock; var->hsync_len = imxfb_mode->mode.hsync_len; var->left_margin = imxfb_mode->mode.left_margin; var->right_margin = imxfb_mode->mode.right_margin; var->vsync_len = imxfb_mode->mode.vsync_len; var->upper_margin = imxfb_mode->mode.upper_margin; var->lower_margin = imxfb_mode->mode.lower_margin; var->sync = imxfb_mode->mode.sync; 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); lcd_clk = clk_get_rate(fbi->clk_per); tmp = var->pixclock * (unsigned long long)lcd_clk; do_div(tmp, 1000000); if (do_div(tmp, 1000000) > 500000) tmp++; pcr = (unsigned int)tmp; if (--pcr > 0x3F) { pcr = 0x3F; printk(KERN_WARNING "Must limit pixel clock to %luHz\n", lcd_clk / pcr); } switch (var->bits_per_pixel) { case 32: pcr |= PCR_BPIX_18; rgb = &def_rgb_18; break; case 16: default: if (is_imx1_fb(fbi)) pcr |= PCR_BPIX_12; else pcr |= PCR_BPIX_16; if (imxfb_mode->pcr & PCR_TFT) rgb = &def_rgb_16_tft; else rgb = &def_rgb_16_stn; break; case 8: pcr |= PCR_BPIX_8; rgb = &def_rgb_8; break; } /* add sync polarities */ pcr |= imxfb_mode->pcr & ~(0x3f | (7 << 25)); fbi->pcr = pcr; /* * 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; if (var->bits_per_pixel == 16 || var->bits_per_pixel == 32) 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; } #ifdef PWMR_BACKLIGHT_AVAILABLE static int imxfb_bl_get_brightness(struct backlight_device *bl) { struct imxfb_info *fbi = bl_get_data(bl); return readl(fbi->regs + LCDC_PWMR) & 0xFF; } static int imxfb_bl_update_status(struct backlight_device *bl) { struct imxfb_info *fbi = bl_get_data(bl); int brightness = bl->props.brightness; if (!fbi->pwmr) return 0; if (bl->props.power != FB_BLANK_UNBLANK) brightness = 0; if (bl->props.fb_blank != FB_BLANK_UNBLANK) brightness = 0; fbi->pwmr = (fbi->pwmr & ~0xFF) | brightness; if (bl->props.fb_blank != FB_BLANK_UNBLANK) { clk_prepare_enable(fbi->clk_ipg); clk_prepare_enable(fbi->clk_ahb); clk_prepare_enable(fbi->clk_per); } writel(fbi->pwmr, fbi->regs + LCDC_PWMR); if (bl->props.fb_blank != FB_BLANK_UNBLANK) { clk_disable_unprepare(fbi->clk_per); clk_disable_unprepare(fbi->clk_ahb); clk_disable_unprepare(fbi->clk_ipg); } return 0; } static const struct backlight_ops imxfb_lcdc_bl_ops = { .update_status = imxfb_bl_update_status, .get_brightness = imxfb_bl_get_brightness, }; static void imxfb_init_backlight(struct imxfb_info *fbi) { struct backlight_properties props; struct backlight_device *bl; if (fbi->bl) return; memset(&props, 0, sizeof(struct backlight_properties)); props.max_brightness = 0xff; props.type = BACKLIGHT_RAW; writel(fbi->pwmr, fbi->regs + LCDC_PWMR); bl = backlight_device_register("imxfb-bl", &fbi->pdev->dev, fbi, &imxfb_lcdc_bl_ops, &props); if (IS_ERR(bl)) { dev_err(&fbi->pdev->dev, "error %ld on backlight register\n", PTR_ERR(bl)); return; } fbi->bl = bl; bl->props.power = FB_BLANK_UNBLANK; bl->props.fb_blank = FB_BLANK_UNBLANK; bl->props.brightness = imxfb_bl_get_brightness(bl); } static void imxfb_exit_backlight(struct imxfb_info *fbi) { if (fbi->bl) backlight_device_unregister(fbi->bl); } #endif static void imxfb_enable_controller(struct imxfb_info *fbi) { if (fbi->enabled) return; pr_debug("Enabling LCD controller\n"); writel(fbi->screen_dma, fbi->regs + LCDC_SSA); /* 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); /* * RMCR_LCDC_EN_MX1 is present on i.MX1 only, but doesn't hurt * on other SoCs */ writel(RMCR_LCDC_EN_MX1, fbi->regs + LCDC_RMCR); clk_prepare_enable(fbi->clk_ipg); clk_prepare_enable(fbi->clk_ahb); clk_prepare_enable(fbi->clk_per); fbi->enabled = true; 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) { if (!fbi->enabled) return; pr_debug("Disabling LCD controller\n"); if (fbi->backlight_power) fbi->backlight_power(0); if (fbi->lcd_power) fbi->lcd_power(0); clk_disable_unprepare(fbi->clk_per); clk_disable_unprepare(fbi->clk_ipg); clk_disable_unprepare(fbi->clk_ahb); fbi->enabled = false; 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; u32 ymax_mask = is_imx1_fb(fbi) ? YMAX_MASK_IMX1 : YMAX_MASK_IMX21; 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 > ymax_mask) 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 /* physical screen start address */ writel(VPW_VPW(var->xres * var->bits_per_pixel / 8 / 4), fbi->regs + LCDC_VPW); writel(HCR_H_WIDTH(var->hsync_len - 1) | HCR_H_WAIT_1(var->right_margin - 1) | HCR_H_WAIT_2(var->left_margin - 3), 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) | (var->yres & ymax_mask), fbi->regs + LCDC_SIZE); writel(fbi->pcr, fbi->regs + LCDC_PCR); #ifndef PWMR_BACKLIGHT_AVAILABLE if (fbi->pwmr) writel(fbi->pwmr, fbi->regs + LCDC_PWMR); #endif writel(fbi->lscr1, fbi->regs + LCDC_LSCR1); /* dmacr = 0 is no valid value, as we need DMA control marks. */ if (fbi->dmacr) 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 fb_info *info = platform_get_drvdata(dev); struct imxfb_info *fbi = info->par; pr_debug("%s\n", __func__); imxfb_disable_controller(fbi); return 0; } static int imxfb_resume(struct platform_device *dev) { struct fb_info *info = platform_get_drvdata(dev); struct imxfb_info *fbi = info->par; pr_debug("%s\n", __func__); imxfb_enable_controller(fbi); return 0; } #else #define imxfb_suspend NULL #define imxfb_resume NULL #endif static int imxfb_init_fbinfo(struct platform_device *pdev) { struct imx_fb_platform_data *pdata = dev_get_platdata(&pdev->dev); struct fb_info *info = dev_get_drvdata(&pdev->dev); struct imxfb_info *fbi = info->par; struct device_node *np; 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)); fbi->devtype = pdev->id_entry->driver_data; 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; if (pdata) { info->var.grayscale = pdata->cmap_greyscale; fbi->cmap_inverse = pdata->cmap_inverse; fbi->cmap_static = pdata->cmap_static; fbi->lscr1 = pdata->lscr1; fbi->dmacr = pdata->dmacr; fbi->pwmr = pdata->pwmr; fbi->lcd_power = pdata->lcd_power; fbi->backlight_power = pdata->backlight_power; } else { np = pdev->dev.of_node; info->var.grayscale = of_property_read_bool(np, "cmap-greyscale"); fbi->cmap_inverse = of_property_read_bool(np, "cmap-inverse"); fbi->cmap_static = of_property_read_bool(np, "cmap-static"); fbi->lscr1 = IMXFB_LSCR1_DEFAULT; of_property_read_u32(np, "fsl,lscr1", &fbi->lscr1); of_property_read_u32(np, "fsl,dmacr", &fbi->dmacr); /* These two function pointers could be used by some specific * platforms. */ fbi->lcd_power = NULL; fbi->backlight_power = NULL; } return 0; } static int imxfb_of_read_mode(struct device *dev, struct device_node *np, struct imx_fb_videomode *imxfb_mode) { int ret; struct fb_videomode *of_mode = &imxfb_mode->mode; u32 bpp; u32 pcr; ret = of_property_read_string(np, "model", &of_mode->name); if (ret) of_mode->name = NULL; ret = of_get_fb_videomode(np, of_mode, OF_USE_NATIVE_MODE); if (ret) { dev_err(dev, "Failed to get videomode from DT\n"); return ret; } ret = of_property_read_u32(np, "bits-per-pixel", &bpp); ret |= of_property_read_u32(np, "fsl,pcr", &pcr); if (ret) { dev_err(dev, "Failed to read bpp and pcr from DT\n"); return -EINVAL; } if (bpp < 1 || bpp > 255) { dev_err(dev, "Bits per pixel have to be between 1 and 255\n"); return -EINVAL; } imxfb_mode->bpp = bpp; imxfb_mode->pcr = pcr; return 0; } static int imxfb_probe(struct platform_device *pdev) { struct imxfb_info *fbi; struct fb_info *info; struct imx_fb_platform_data *pdata; struct resource *res; struct imx_fb_videomode *m; const struct of_device_id *of_id; int ret, i; int bytes_per_pixel; dev_info(&pdev->dev, "i.MX Framebuffer driver\n"); of_id = of_match_device(imxfb_of_dev_id, &pdev->dev); if (of_id) pdev->id_entry = of_id->data; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!res) return -ENODEV; pdata = dev_get_platdata(&pdev->dev); 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; if (pdata) { if (!fb_mode) fb_mode = pdata->mode[0].mode.name; fbi->mode = pdata->mode; fbi->num_modes = pdata->num_modes; } else { struct device_node *display_np; fb_mode = NULL; display_np = of_parse_phandle(pdev->dev.of_node, "display", 0); if (!display_np) { dev_err(&pdev->dev, "No display defined in devicetree\n"); ret = -EINVAL; goto failed_of_parse; } /* * imxfb does not support more modes, we choose only the native * mode. */ fbi->num_modes = 1; fbi->mode = devm_kzalloc(&pdev->dev, sizeof(struct imx_fb_videomode), GFP_KERNEL); if (!fbi->mode) { ret = -ENOMEM; goto failed_of_parse; } ret = imxfb_of_read_mode(&pdev->dev, display_np, fbi->mode); if (ret) goto failed_of_parse; } /* Calculate maximum bytes used per pixel. In most cases this should * be the same as m->bpp/8 */ m = &fbi->mode[0]; bytes_per_pixel = (m->bpp + 7) / 8; for (i = 0; i < fbi->num_modes; i++, m++) info->fix.smem_len = max_t(size_t, info->fix.smem_len, m->mode.xres * m->mode.yres * bytes_per_pixel); res = request_mem_region(res->start, resource_size(res), DRIVER_NAME); if (!res) { ret = -EBUSY; goto failed_req; } fbi->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); if (IS_ERR(fbi->clk_ipg)) { ret = PTR_ERR(fbi->clk_ipg); goto failed_getclock; } fbi->clk_ahb = devm_clk_get(&pdev->dev, "ahb"); if (IS_ERR(fbi->clk_ahb)) { ret = PTR_ERR(fbi->clk_ahb); goto failed_getclock; } fbi->clk_per = devm_clk_get(&pdev->dev, "per"); if (IS_ERR(fbi->clk_per)) { ret = PTR_ERR(fbi->clk_per); goto failed_getclock; } fbi->regs = ioremap(res->start, resource_size(res)); if (fbi->regs == NULL) { dev_err(&pdev->dev, "Cannot map frame buffer registers\n"); ret = -ENOMEM; goto failed_ioremap; } /* Seems not being used by anyone, so no support for oftree */ if (!pdata || !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; } if (pdata && pdata->init) { ret = pdata->init(fbi->pdev); if (ret) goto failed_platform_init; } INIT_LIST_HEAD(&info->modelist); for (i = 0; i < fbi->num_modes; i++) fb_add_videomode(&fbi->mode[i].mode, &info->modelist); /* * 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); fbi->pdev = pdev; #ifdef PWMR_BACKLIGHT_AVAILABLE imxfb_init_backlight(fbi); #endif return 0; failed_register: fb_dealloc_cmap(&info->cmap); failed_cmap: if (pdata && pdata->exit) pdata->exit(fbi->pdev); failed_platform_init: if (pdata && !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: failed_getclock: release_mem_region(res->start, resource_size(res)); failed_req: failed_of_parse: kfree(info->pseudo_palette); failed_init: framebuffer_release(info); return ret; } static int imxfb_remove(struct platform_device *pdev) { struct imx_fb_platform_data *pdata; 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); #ifdef PWMR_BACKLIGHT_AVAILABLE imxfb_exit_backlight(fbi); #endif unregister_framebuffer(info); pdata = dev_get_platdata(&pdev->dev); if (pdata && pdata->exit) pdata->exit(fbi->pdev); fb_dealloc_cmap(&info->cmap); kfree(info->pseudo_palette); framebuffer_release(info); iounmap(fbi->regs); release_mem_region(res->start, resource_size(res)); return 0; } static 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 = imxfb_remove, .shutdown = imxfb_shutdown, .driver = { .name = DRIVER_NAME, .of_match_table = imxfb_of_dev_id, }, .id_table = imxfb_devtype, }; static int imxfb_setup(void) { #ifndef MODULE char *opt, *options = NULL; if (fb_get_options("imxfb", &options)) return -ENODEV; if (!options || !*options) return 0; while ((opt = strsep(&options, ",")) != NULL) { if (!*opt) continue; else fb_mode = opt; } #endif return 0; } static int __init imxfb_init(void) { int ret = imxfb_setup(); if (ret < 0) return ret; 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("Freescale i.MX framebuffer driver"); MODULE_AUTHOR("Sascha Hauer, Pengutronix"); MODULE_LICENSE("GPL");