/* * Driver for AT91/AT32 LCD Controller * * Copyright (C) 2007 Atmel Corporation * * 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. */ #include <linux/kernel.h> #include <linux/platform_device.h> #include <linux/dma-mapping.h> #include <linux/interrupt.h> #include <linux/clk.h> #include <linux/fb.h> #include <linux/init.h> #include <linux/delay.h> #include <linux/backlight.h> #include <mach/board.h> #include <mach/cpu.h> #include <mach/gpio.h> #include <video/atmel_lcdc.h> #define lcdc_readl(sinfo, reg) __raw_readl((sinfo)->mmio+(reg)) #define lcdc_writel(sinfo, reg, val) __raw_writel((val), (sinfo)->mmio+(reg)) /* configurable parameters */ #define ATMEL_LCDC_CVAL_DEFAULT 0xc8 #define ATMEL_LCDC_DMA_BURST_LEN 8 /* words */ #define ATMEL_LCDC_FIFO_SIZE 512 /* words */ #if defined(CONFIG_ARCH_AT91) #define ATMEL_LCDFB_FBINFO_DEFAULT (FBINFO_DEFAULT \ | FBINFO_PARTIAL_PAN_OK \ | FBINFO_HWACCEL_YPAN) static inline void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo, struct fb_var_screeninfo *var) { } #elif defined(CONFIG_AVR32) #define ATMEL_LCDFB_FBINFO_DEFAULT (FBINFO_DEFAULT \ | FBINFO_PARTIAL_PAN_OK \ | FBINFO_HWACCEL_XPAN \ | FBINFO_HWACCEL_YPAN) static void atmel_lcdfb_update_dma2d(struct atmel_lcdfb_info *sinfo, struct fb_var_screeninfo *var) { u32 dma2dcfg; u32 pixeloff; pixeloff = (var->xoffset * var->bits_per_pixel) & 0x1f; dma2dcfg = ((var->xres_virtual - var->xres) * var->bits_per_pixel) / 8; dma2dcfg |= pixeloff << ATMEL_LCDC_PIXELOFF_OFFSET; lcdc_writel(sinfo, ATMEL_LCDC_DMA2DCFG, dma2dcfg); /* Update configuration */ lcdc_writel(sinfo, ATMEL_LCDC_DMACON, lcdc_readl(sinfo, ATMEL_LCDC_DMACON) | ATMEL_LCDC_DMAUPDT); } #endif static const u32 contrast_ctr = ATMEL_LCDC_PS_DIV8 | ATMEL_LCDC_POL_POSITIVE | ATMEL_LCDC_ENA_PWMENABLE; #ifdef CONFIG_BACKLIGHT_ATMEL_LCDC /* some bl->props field just changed */ static int atmel_bl_update_status(struct backlight_device *bl) { struct atmel_lcdfb_info *sinfo = bl_get_data(bl); int power = sinfo->bl_power; int brightness = bl->props.brightness; /* REVISIT there may be a meaningful difference between * fb_blank and power ... there seem to be some cases * this doesn't handle correctly. */ if (bl->props.fb_blank != sinfo->bl_power) power = bl->props.fb_blank; else if (bl->props.power != sinfo->bl_power) power = bl->props.power; if (brightness < 0 && power == FB_BLANK_UNBLANK) brightness = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL); else if (power != FB_BLANK_UNBLANK) brightness = 0; lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, brightness); lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, brightness ? contrast_ctr : 0); bl->props.fb_blank = bl->props.power = sinfo->bl_power = power; return 0; } static int atmel_bl_get_brightness(struct backlight_device *bl) { struct atmel_lcdfb_info *sinfo = bl_get_data(bl); return lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL); } static struct backlight_ops atmel_lcdc_bl_ops = { .update_status = atmel_bl_update_status, .get_brightness = atmel_bl_get_brightness, }; static void init_backlight(struct atmel_lcdfb_info *sinfo) { struct backlight_device *bl; sinfo->bl_power = FB_BLANK_UNBLANK; if (sinfo->backlight) return; bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo, &atmel_lcdc_bl_ops); if (IS_ERR(bl)) { dev_err(&sinfo->pdev->dev, "error %ld on backlight register\n", PTR_ERR(bl)); return; } sinfo->backlight = bl; bl->props.power = FB_BLANK_UNBLANK; bl->props.fb_blank = FB_BLANK_UNBLANK; bl->props.max_brightness = 0xff; bl->props.brightness = atmel_bl_get_brightness(bl); } static void exit_backlight(struct atmel_lcdfb_info *sinfo) { if (sinfo->backlight) backlight_device_unregister(sinfo->backlight); } #else static void init_backlight(struct atmel_lcdfb_info *sinfo) { dev_warn(&sinfo->pdev->dev, "backlight control is not available\n"); } static void exit_backlight(struct atmel_lcdfb_info *sinfo) { } #endif static void init_contrast(struct atmel_lcdfb_info *sinfo) { /* have some default contrast/backlight settings */ lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr); lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_VAL, ATMEL_LCDC_CVAL_DEFAULT); if (sinfo->lcdcon_is_backlight) init_backlight(sinfo); } static struct fb_fix_screeninfo atmel_lcdfb_fix __initdata = { .type = FB_TYPE_PACKED_PIXELS, .visual = FB_VISUAL_TRUECOLOR, .xpanstep = 0, .ypanstep = 1, .ywrapstep = 0, .accel = FB_ACCEL_NONE, }; static unsigned long compute_hozval(unsigned long xres, unsigned long lcdcon2) { unsigned long value; if (!(cpu_is_at91sam9261() || cpu_is_at91sam9g10() || cpu_is_at32ap7000())) return xres; value = xres; if ((lcdcon2 & ATMEL_LCDC_DISTYPE) != ATMEL_LCDC_DISTYPE_TFT) { /* STN display */ if ((lcdcon2 & ATMEL_LCDC_DISTYPE) == ATMEL_LCDC_DISTYPE_STNCOLOR) { value *= 3; } if ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_4 || ( (lcdcon2 & ATMEL_LCDC_IFWIDTH) == ATMEL_LCDC_IFWIDTH_8 && (lcdcon2 & ATMEL_LCDC_SCANMOD) == ATMEL_LCDC_SCANMOD_DUAL )) value = DIV_ROUND_UP(value, 4); else value = DIV_ROUND_UP(value, 8); } return value; } static void atmel_lcdfb_stop_nowait(struct atmel_lcdfb_info *sinfo) { /* Turn off the LCD controller and the DMA controller */ lcdc_writel(sinfo, ATMEL_LCDC_PWRCON, sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET); /* Wait for the LCDC core to become idle */ while (lcdc_readl(sinfo, ATMEL_LCDC_PWRCON) & ATMEL_LCDC_BUSY) msleep(10); lcdc_writel(sinfo, ATMEL_LCDC_DMACON, 0); } static void atmel_lcdfb_stop(struct atmel_lcdfb_info *sinfo) { atmel_lcdfb_stop_nowait(sinfo); /* Wait for DMA engine to become idle... */ while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY) msleep(10); } static void atmel_lcdfb_start(struct atmel_lcdfb_info *sinfo) { lcdc_writel(sinfo, ATMEL_LCDC_DMACON, sinfo->default_dmacon); lcdc_writel(sinfo, ATMEL_LCDC_PWRCON, (sinfo->guard_time << ATMEL_LCDC_GUARDT_OFFSET) | ATMEL_LCDC_PWR); } static void atmel_lcdfb_update_dma(struct fb_info *info, struct fb_var_screeninfo *var) { struct atmel_lcdfb_info *sinfo = info->par; struct fb_fix_screeninfo *fix = &info->fix; unsigned long dma_addr; dma_addr = (fix->smem_start + var->yoffset * fix->line_length + var->xoffset * var->bits_per_pixel / 8); dma_addr &= ~3UL; /* Set framebuffer DMA base address and pixel offset */ lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr); atmel_lcdfb_update_dma2d(sinfo, var); } static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo) { struct fb_info *info = sinfo->info; dma_free_writecombine(info->device, info->fix.smem_len, info->screen_base, info->fix.smem_start); } /** * atmel_lcdfb_alloc_video_memory - Allocate framebuffer memory * @sinfo: the frame buffer to allocate memory for * * This function is called only from the atmel_lcdfb_probe() * so no locking by fb_info->mm_lock around smem_len setting is needed. */ static int atmel_lcdfb_alloc_video_memory(struct atmel_lcdfb_info *sinfo) { struct fb_info *info = sinfo->info; struct fb_var_screeninfo *var = &info->var; unsigned int smem_len; smem_len = (var->xres_virtual * var->yres_virtual * ((var->bits_per_pixel + 7) / 8)); info->fix.smem_len = max(smem_len, sinfo->smem_len); info->screen_base = dma_alloc_writecombine(info->device, info->fix.smem_len, (dma_addr_t *)&info->fix.smem_start, GFP_KERNEL); if (!info->screen_base) { return -ENOMEM; } memset(info->screen_base, 0, info->fix.smem_len); return 0; } static const struct fb_videomode *atmel_lcdfb_choose_mode(struct fb_var_screeninfo *var, struct fb_info *info) { struct fb_videomode varfbmode; const struct fb_videomode *fbmode = NULL; fb_var_to_videomode(&varfbmode, var); fbmode = fb_find_nearest_mode(&varfbmode, &info->modelist); if (fbmode) fb_videomode_to_var(var, fbmode); return fbmode; } /** * atmel_lcdfb_check_var - Validates a var passed in. * @var: frame buffer variable screen structure * @info: frame buffer structure that represents a single frame buffer * * Checks to see if the hardware supports the state requested by * var passed in. This function does not alter the hardware * state!!! This means the data stored in struct fb_info and * struct atmel_lcdfb_info do not change. This includes the var * inside of struct fb_info. Do NOT change these. This function * can be called on its own if we intent to only test a mode and * not actually set it. The stuff in modedb.c is a example of * this. If the var passed in is slightly off by what the * hardware can support then we alter the var PASSED in to what * we can do. If the hardware doesn't support mode change a * -EINVAL will be returned by the upper layers. You don't need * to implement this function then. If you hardware doesn't * support changing the resolution then this function is not * needed. In this case the driver would just provide a var that * represents the static state the screen is in. * * Returns negative errno on error, or zero on success. */ static int atmel_lcdfb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { struct device *dev = info->device; struct atmel_lcdfb_info *sinfo = info->par; unsigned long clk_value_khz; clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000; dev_dbg(dev, "%s:\n", __func__); if (!(var->pixclock && var->bits_per_pixel)) { /* choose a suitable mode if possible */ if (!atmel_lcdfb_choose_mode(var, info)) { dev_err(dev, "needed value not specified\n"); return -EINVAL; } } dev_dbg(dev, " resolution: %ux%u\n", var->xres, var->yres); dev_dbg(dev, " pixclk: %lu KHz\n", PICOS2KHZ(var->pixclock)); dev_dbg(dev, " bpp: %u\n", var->bits_per_pixel); dev_dbg(dev, " clk: %lu KHz\n", clk_value_khz); if (PICOS2KHZ(var->pixclock) > clk_value_khz) { dev_err(dev, "%lu KHz pixel clock is too fast\n", PICOS2KHZ(var->pixclock)); return -EINVAL; } /* Do not allow to have real resoulution larger than virtual */ if (var->xres > var->xres_virtual) var->xres_virtual = var->xres; if (var->yres > var->yres_virtual) var->yres_virtual = var->yres; /* Force same alignment for each line */ var->xres = (var->xres + 3) & ~3UL; var->xres_virtual = (var->xres_virtual + 3) & ~3UL; var->red.msb_right = var->green.msb_right = var->blue.msb_right = 0; var->transp.msb_right = 0; var->transp.offset = var->transp.length = 0; var->xoffset = var->yoffset = 0; if (info->fix.smem_len) { unsigned int smem_len = (var->xres_virtual * var->yres_virtual * ((var->bits_per_pixel + 7) / 8)); if (smem_len > info->fix.smem_len) return -EINVAL; } /* Saturate vertical and horizontal timings at maximum values */ var->vsync_len = min_t(u32, var->vsync_len, (ATMEL_LCDC_VPW >> ATMEL_LCDC_VPW_OFFSET) + 1); var->upper_margin = min_t(u32, var->upper_margin, ATMEL_LCDC_VBP >> ATMEL_LCDC_VBP_OFFSET); var->lower_margin = min_t(u32, var->lower_margin, ATMEL_LCDC_VFP); var->right_margin = min_t(u32, var->right_margin, (ATMEL_LCDC_HFP >> ATMEL_LCDC_HFP_OFFSET) + 1); var->hsync_len = min_t(u32, var->hsync_len, (ATMEL_LCDC_HPW >> ATMEL_LCDC_HPW_OFFSET) + 1); var->left_margin = min_t(u32, var->left_margin, ATMEL_LCDC_HBP + 1); /* Some parameters can't be zero */ var->vsync_len = max_t(u32, var->vsync_len, 1); var->right_margin = max_t(u32, var->right_margin, 1); var->hsync_len = max_t(u32, var->hsync_len, 1); var->left_margin = max_t(u32, var->left_margin, 1); switch (var->bits_per_pixel) { case 1: case 2: case 4: case 8: var->red.offset = var->green.offset = var->blue.offset = 0; var->red.length = var->green.length = var->blue.length = var->bits_per_pixel; break; case 15: case 16: if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) { /* RGB:565 mode */ var->red.offset = 11; var->blue.offset = 0; var->green.length = 6; } else if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB555) { var->red.offset = 10; var->blue.offset = 0; var->green.length = 5; } else { /* BGR:555 mode */ var->red.offset = 0; var->blue.offset = 10; var->green.length = 5; } var->green.offset = 5; var->red.length = var->blue.length = 5; break; case 32: var->transp.offset = 24; var->transp.length = 8; /* fall through */ case 24: if (sinfo->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) { /* RGB:888 mode */ var->red.offset = 16; var->blue.offset = 0; } else { /* BGR:888 mode */ var->red.offset = 0; var->blue.offset = 16; } var->green.offset = 8; var->red.length = var->green.length = var->blue.length = 8; break; default: dev_err(dev, "color depth %d not supported\n", var->bits_per_pixel); return -EINVAL; } return 0; } /* * LCD reset sequence */ static void atmel_lcdfb_reset(struct atmel_lcdfb_info *sinfo) { might_sleep(); atmel_lcdfb_stop(sinfo); atmel_lcdfb_start(sinfo); } /** * atmel_lcdfb_set_par - Alters the hardware state. * @info: frame buffer structure that represents a single frame buffer * * Using the fb_var_screeninfo in fb_info we set the resolution * of the this particular framebuffer. This function alters the * par AND the fb_fix_screeninfo stored in fb_info. It doesn't * not alter var in fb_info since we are using that data. This * means we depend on the data in var inside fb_info to be * supported by the hardware. atmel_lcdfb_check_var is always called * before atmel_lcdfb_set_par to ensure this. Again if you can't * change the resolution you don't need this function. * */ static int atmel_lcdfb_set_par(struct fb_info *info) { struct atmel_lcdfb_info *sinfo = info->par; unsigned long hozval_linesz; unsigned long value; unsigned long clk_value_khz; unsigned long bits_per_line; unsigned long pix_factor = 2; might_sleep(); dev_dbg(info->device, "%s:\n", __func__); dev_dbg(info->device, " * resolution: %ux%u (%ux%u virtual)\n", info->var.xres, info->var.yres, info->var.xres_virtual, info->var.yres_virtual); atmel_lcdfb_stop_nowait(sinfo); if (info->var.bits_per_pixel == 1) info->fix.visual = FB_VISUAL_MONO01; else if (info->var.bits_per_pixel <= 8) info->fix.visual = FB_VISUAL_PSEUDOCOLOR; else info->fix.visual = FB_VISUAL_TRUECOLOR; bits_per_line = info->var.xres_virtual * info->var.bits_per_pixel; info->fix.line_length = DIV_ROUND_UP(bits_per_line, 8); /* Re-initialize the DMA engine... */ dev_dbg(info->device, " * update DMA engine\n"); atmel_lcdfb_update_dma(info, &info->var); /* ...set frame size and burst length = 8 words (?) */ value = (info->var.yres * info->var.xres * info->var.bits_per_pixel) / 32; value |= ((ATMEL_LCDC_DMA_BURST_LEN - 1) << ATMEL_LCDC_BLENGTH_OFFSET); lcdc_writel(sinfo, ATMEL_LCDC_DMAFRMCFG, value); /* Now, the LCDC core... */ /* Set pixel clock */ if (cpu_is_at91sam9g45() && !cpu_is_at91sam9g45es()) pix_factor = 1; clk_value_khz = clk_get_rate(sinfo->lcdc_clk) / 1000; value = DIV_ROUND_UP(clk_value_khz, PICOS2KHZ(info->var.pixclock)); if (value < pix_factor) { dev_notice(info->device, "Bypassing pixel clock divider\n"); lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, ATMEL_LCDC_BYPASS); } else { value = (value / pix_factor) - 1; dev_dbg(info->device, " * programming CLKVAL = 0x%08lx\n", value); lcdc_writel(sinfo, ATMEL_LCDC_LCDCON1, value << ATMEL_LCDC_CLKVAL_OFFSET); info->var.pixclock = KHZ2PICOS(clk_value_khz / (pix_factor * (value + 1))); dev_dbg(info->device, " updated pixclk: %lu KHz\n", PICOS2KHZ(info->var.pixclock)); } /* Initialize control register 2 */ value = sinfo->default_lcdcon2; if (!(info->var.sync & FB_SYNC_HOR_HIGH_ACT)) value |= ATMEL_LCDC_INVLINE_INVERTED; if (!(info->var.sync & FB_SYNC_VERT_HIGH_ACT)) value |= ATMEL_LCDC_INVFRAME_INVERTED; switch (info->var.bits_per_pixel) { case 1: value |= ATMEL_LCDC_PIXELSIZE_1; break; case 2: value |= ATMEL_LCDC_PIXELSIZE_2; break; case 4: value |= ATMEL_LCDC_PIXELSIZE_4; break; case 8: value |= ATMEL_LCDC_PIXELSIZE_8; break; case 15: /* fall through */ case 16: value |= ATMEL_LCDC_PIXELSIZE_16; break; case 24: value |= ATMEL_LCDC_PIXELSIZE_24; break; case 32: value |= ATMEL_LCDC_PIXELSIZE_32; break; default: BUG(); break; } dev_dbg(info->device, " * LCDCON2 = %08lx\n", value); lcdc_writel(sinfo, ATMEL_LCDC_LCDCON2, value); /* Vertical timing */ value = (info->var.vsync_len - 1) << ATMEL_LCDC_VPW_OFFSET; value |= info->var.upper_margin << ATMEL_LCDC_VBP_OFFSET; value |= info->var.lower_margin; dev_dbg(info->device, " * LCDTIM1 = %08lx\n", value); lcdc_writel(sinfo, ATMEL_LCDC_TIM1, value); /* Horizontal timing */ value = (info->var.right_margin - 1) << ATMEL_LCDC_HFP_OFFSET; value |= (info->var.hsync_len - 1) << ATMEL_LCDC_HPW_OFFSET; value |= (info->var.left_margin - 1); dev_dbg(info->device, " * LCDTIM2 = %08lx\n", value); lcdc_writel(sinfo, ATMEL_LCDC_TIM2, value); /* Horizontal value (aka line size) */ hozval_linesz = compute_hozval(info->var.xres, lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2)); /* Display size */ value = (hozval_linesz - 1) << ATMEL_LCDC_HOZVAL_OFFSET; value |= info->var.yres - 1; dev_dbg(info->device, " * LCDFRMCFG = %08lx\n", value); lcdc_writel(sinfo, ATMEL_LCDC_LCDFRMCFG, value); /* FIFO Threshold: Use formula from data sheet */ value = ATMEL_LCDC_FIFO_SIZE - (2 * ATMEL_LCDC_DMA_BURST_LEN + 3); lcdc_writel(sinfo, ATMEL_LCDC_FIFO, value); /* Toggle LCD_MODE every frame */ lcdc_writel(sinfo, ATMEL_LCDC_MVAL, 0); /* Disable all interrupts */ lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL); /* Enable FIFO & DMA errors */ lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI); /* ...wait for DMA engine to become idle... */ while (lcdc_readl(sinfo, ATMEL_LCDC_DMACON) & ATMEL_LCDC_DMABUSY) msleep(10); atmel_lcdfb_start(sinfo); dev_dbg(info->device, " * DONE\n"); return 0; } static inline unsigned int chan_to_field(unsigned int chan, const struct fb_bitfield *bf) { chan &= 0xffff; chan >>= 16 - bf->length; return chan << bf->offset; } /** * atmel_lcdfb_setcolreg - Optional function. Sets a color register. * @regno: Which register in the CLUT we are programming * @red: The red value which can be up to 16 bits wide * @green: The green value which can be up to 16 bits wide * @blue: The blue value which can be up to 16 bits wide. * @transp: If supported the alpha value which can be up to 16 bits wide. * @info: frame buffer info structure * * Set a single color register. The values supplied have a 16 bit * magnitude which needs to be scaled in this function for the hardware. * Things to take into consideration are how many color registers, if * any, are supported with the current color visual. With truecolor mode * no color palettes are supported. Here a psuedo palette is created * which we store the value in pseudo_palette in struct fb_info. For * pseudocolor mode we have a limited color palette. To deal with this * we can program what color is displayed for a particular pixel value. * DirectColor is similar in that we can program each color field. If * we have a static colormap we don't need to implement this function. * * Returns negative errno on error, or zero on success. In an * ideal world, this would have been the case, but as it turns * out, the other drivers return 1 on failure, so that's what * we're going to do. */ static int atmel_lcdfb_setcolreg(unsigned int regno, unsigned int red, unsigned int green, unsigned int blue, unsigned int transp, struct fb_info *info) { struct atmel_lcdfb_info *sinfo = info->par; unsigned int val; u32 *pal; int ret = 1; if (info->var.grayscale) red = green = blue = (19595 * red + 38470 * green + 7471 * blue) >> 16; switch (info->fix.visual) { case FB_VISUAL_TRUECOLOR: if (regno < 16) { 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_PSEUDOCOLOR: if (regno < 256) { val = ((red >> 11) & 0x001f); val |= ((green >> 6) & 0x03e0); val |= ((blue >> 1) & 0x7c00); /* * TODO: intensity bit. Maybe something like * ~(red[10] ^ green[10] ^ blue[10]) & 1 */ lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val); ret = 0; } break; case FB_VISUAL_MONO01: if (regno < 2) { val = (regno == 0) ? 0x00 : 0x1F; lcdc_writel(sinfo, ATMEL_LCDC_LUT(regno), val); ret = 0; } break; } return ret; } static int atmel_lcdfb_pan_display(struct fb_var_screeninfo *var, struct fb_info *info) { dev_dbg(info->device, "%s\n", __func__); atmel_lcdfb_update_dma(info, var); return 0; } static struct fb_ops atmel_lcdfb_ops = { .owner = THIS_MODULE, .fb_check_var = atmel_lcdfb_check_var, .fb_set_par = atmel_lcdfb_set_par, .fb_setcolreg = atmel_lcdfb_setcolreg, .fb_pan_display = atmel_lcdfb_pan_display, .fb_fillrect = cfb_fillrect, .fb_copyarea = cfb_copyarea, .fb_imageblit = cfb_imageblit, }; static irqreturn_t atmel_lcdfb_interrupt(int irq, void *dev_id) { struct fb_info *info = dev_id; struct atmel_lcdfb_info *sinfo = info->par; u32 status; status = lcdc_readl(sinfo, ATMEL_LCDC_ISR); if (status & ATMEL_LCDC_UFLWI) { dev_warn(info->device, "FIFO underflow %#x\n", status); /* reset DMA and FIFO to avoid screen shifting */ schedule_work(&sinfo->task); } lcdc_writel(sinfo, ATMEL_LCDC_ICR, status); return IRQ_HANDLED; } /* * LCD controller task (to reset the LCD) */ static void atmel_lcdfb_task(struct work_struct *work) { struct atmel_lcdfb_info *sinfo = container_of(work, struct atmel_lcdfb_info, task); atmel_lcdfb_reset(sinfo); } static int __init atmel_lcdfb_init_fbinfo(struct atmel_lcdfb_info *sinfo) { struct fb_info *info = sinfo->info; int ret = 0; info->var.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW; dev_info(info->device, "%luKiB frame buffer at %08lx (mapped at %p)\n", (unsigned long)info->fix.smem_len / 1024, (unsigned long)info->fix.smem_start, info->screen_base); /* Allocate colormap */ ret = fb_alloc_cmap(&info->cmap, 256, 0); if (ret < 0) dev_err(info->device, "Alloc color map failed\n"); return ret; } static void atmel_lcdfb_start_clock(struct atmel_lcdfb_info *sinfo) { if (sinfo->bus_clk) clk_enable(sinfo->bus_clk); clk_enable(sinfo->lcdc_clk); } static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo) { if (sinfo->bus_clk) clk_disable(sinfo->bus_clk); clk_disable(sinfo->lcdc_clk); } static int __init atmel_lcdfb_probe(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct fb_info *info; struct atmel_lcdfb_info *sinfo; struct atmel_lcdfb_info *pdata_sinfo; struct fb_videomode fbmode; struct resource *regs = NULL; struct resource *map = NULL; int ret; dev_dbg(dev, "%s BEGIN\n", __func__); ret = -ENOMEM; info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev); if (!info) { dev_err(dev, "cannot allocate memory\n"); goto out; } sinfo = info->par; if (dev->platform_data) { pdata_sinfo = (struct atmel_lcdfb_info *)dev->platform_data; sinfo->default_bpp = pdata_sinfo->default_bpp; sinfo->default_dmacon = pdata_sinfo->default_dmacon; sinfo->default_lcdcon2 = pdata_sinfo->default_lcdcon2; sinfo->default_monspecs = pdata_sinfo->default_monspecs; sinfo->atmel_lcdfb_power_control = pdata_sinfo->atmel_lcdfb_power_control; sinfo->guard_time = pdata_sinfo->guard_time; sinfo->smem_len = pdata_sinfo->smem_len; sinfo->lcdcon_is_backlight = pdata_sinfo->lcdcon_is_backlight; sinfo->lcd_wiring_mode = pdata_sinfo->lcd_wiring_mode; } else { dev_err(dev, "cannot get default configuration\n"); goto free_info; } sinfo->info = info; sinfo->pdev = pdev; strcpy(info->fix.id, sinfo->pdev->name); info->flags = ATMEL_LCDFB_FBINFO_DEFAULT; info->pseudo_palette = sinfo->pseudo_palette; info->fbops = &atmel_lcdfb_ops; memcpy(&info->monspecs, sinfo->default_monspecs, sizeof(info->monspecs)); info->fix = atmel_lcdfb_fix; /* Enable LCDC Clocks */ if (cpu_is_at91sam9261() || cpu_is_at91sam9g10() || cpu_is_at32ap7000()) { sinfo->bus_clk = clk_get(dev, "hck1"); if (IS_ERR(sinfo->bus_clk)) { ret = PTR_ERR(sinfo->bus_clk); goto free_info; } } sinfo->lcdc_clk = clk_get(dev, "lcdc_clk"); if (IS_ERR(sinfo->lcdc_clk)) { ret = PTR_ERR(sinfo->lcdc_clk); goto put_bus_clk; } atmel_lcdfb_start_clock(sinfo); ret = fb_find_mode(&info->var, info, NULL, info->monspecs.modedb, info->monspecs.modedb_len, info->monspecs.modedb, sinfo->default_bpp); if (!ret) { dev_err(dev, "no suitable video mode found\n"); goto stop_clk; } regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); if (!regs) { dev_err(dev, "resources unusable\n"); ret = -ENXIO; goto stop_clk; } sinfo->irq_base = platform_get_irq(pdev, 0); if (sinfo->irq_base < 0) { dev_err(dev, "unable to get irq\n"); ret = sinfo->irq_base; goto stop_clk; } /* Initialize video memory */ map = platform_get_resource(pdev, IORESOURCE_MEM, 1); if (map) { /* use a pre-allocated memory buffer */ info->fix.smem_start = map->start; info->fix.smem_len = map->end - map->start + 1; if (!request_mem_region(info->fix.smem_start, info->fix.smem_len, pdev->name)) { ret = -EBUSY; goto stop_clk; } info->screen_base = ioremap(info->fix.smem_start, info->fix.smem_len); if (!info->screen_base) goto release_intmem; /* * Don't clear the framebuffer -- someone may have set * up a splash image. */ } else { /* alocate memory buffer */ ret = atmel_lcdfb_alloc_video_memory(sinfo); if (ret < 0) { dev_err(dev, "cannot allocate framebuffer: %d\n", ret); goto stop_clk; } } /* LCDC registers */ info->fix.mmio_start = regs->start; info->fix.mmio_len = regs->end - regs->start + 1; if (!request_mem_region(info->fix.mmio_start, info->fix.mmio_len, pdev->name)) { ret = -EBUSY; goto free_fb; } sinfo->mmio = ioremap(info->fix.mmio_start, info->fix.mmio_len); if (!sinfo->mmio) { dev_err(dev, "cannot map LCDC registers\n"); goto release_mem; } /* Initialize PWM for contrast or backlight ("off") */ init_contrast(sinfo); /* interrupt */ ret = request_irq(sinfo->irq_base, atmel_lcdfb_interrupt, 0, pdev->name, info); if (ret) { dev_err(dev, "request_irq failed: %d\n", ret); goto unmap_mmio; } /* Some operations on the LCDC might sleep and * require a preemptible task context */ INIT_WORK(&sinfo->task, atmel_lcdfb_task); ret = atmel_lcdfb_init_fbinfo(sinfo); if (ret < 0) { dev_err(dev, "init fbinfo failed: %d\n", ret); goto unregister_irqs; } /* * This makes sure that our colour bitfield * descriptors are correctly initialised. */ atmel_lcdfb_check_var(&info->var, info); ret = fb_set_var(info, &info->var); if (ret) { dev_warn(dev, "unable to set display parameters\n"); goto free_cmap; } dev_set_drvdata(dev, info); /* * Tell the world that we're ready to go */ ret = register_framebuffer(info); if (ret < 0) { dev_err(dev, "failed to register framebuffer device: %d\n", ret); goto reset_drvdata; } /* add selected videomode to modelist */ fb_var_to_videomode(&fbmode, &info->var); fb_add_videomode(&fbmode, &info->modelist); /* Power up the LCDC screen */ if (sinfo->atmel_lcdfb_power_control) sinfo->atmel_lcdfb_power_control(1); dev_info(dev, "fb%d: Atmel LCDC at 0x%08lx (mapped at %p), irq %d\n", info->node, info->fix.mmio_start, sinfo->mmio, sinfo->irq_base); return 0; reset_drvdata: dev_set_drvdata(dev, NULL); free_cmap: fb_dealloc_cmap(&info->cmap); unregister_irqs: cancel_work_sync(&sinfo->task); free_irq(sinfo->irq_base, info); unmap_mmio: exit_backlight(sinfo); iounmap(sinfo->mmio); release_mem: release_mem_region(info->fix.mmio_start, info->fix.mmio_len); free_fb: if (map) iounmap(info->screen_base); else atmel_lcdfb_free_video_memory(sinfo); release_intmem: if (map) release_mem_region(info->fix.smem_start, info->fix.smem_len); stop_clk: atmel_lcdfb_stop_clock(sinfo); clk_put(sinfo->lcdc_clk); put_bus_clk: if (sinfo->bus_clk) clk_put(sinfo->bus_clk); free_info: framebuffer_release(info); out: dev_dbg(dev, "%s FAILED\n", __func__); return ret; } static int __exit atmel_lcdfb_remove(struct platform_device *pdev) { struct device *dev = &pdev->dev; struct fb_info *info = dev_get_drvdata(dev); struct atmel_lcdfb_info *sinfo; if (!info || !info->par) return 0; sinfo = info->par; cancel_work_sync(&sinfo->task); exit_backlight(sinfo); if (sinfo->atmel_lcdfb_power_control) sinfo->atmel_lcdfb_power_control(0); unregister_framebuffer(info); atmel_lcdfb_stop_clock(sinfo); clk_put(sinfo->lcdc_clk); if (sinfo->bus_clk) clk_put(sinfo->bus_clk); fb_dealloc_cmap(&info->cmap); free_irq(sinfo->irq_base, info); iounmap(sinfo->mmio); release_mem_region(info->fix.mmio_start, info->fix.mmio_len); if (platform_get_resource(pdev, IORESOURCE_MEM, 1)) { iounmap(info->screen_base); release_mem_region(info->fix.smem_start, info->fix.smem_len); } else { atmel_lcdfb_free_video_memory(sinfo); } dev_set_drvdata(dev, NULL); framebuffer_release(info); return 0; } #ifdef CONFIG_PM static int atmel_lcdfb_suspend(struct platform_device *pdev, pm_message_t mesg) { struct fb_info *info = platform_get_drvdata(pdev); struct atmel_lcdfb_info *sinfo = info->par; /* * We don't want to handle interrupts while the clock is * stopped. It may take forever. */ lcdc_writel(sinfo, ATMEL_LCDC_IDR, ~0UL); sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_VAL); lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0); if (sinfo->atmel_lcdfb_power_control) sinfo->atmel_lcdfb_power_control(0); atmel_lcdfb_stop(sinfo); atmel_lcdfb_stop_clock(sinfo); return 0; } static int atmel_lcdfb_resume(struct platform_device *pdev) { struct fb_info *info = platform_get_drvdata(pdev); struct atmel_lcdfb_info *sinfo = info->par; atmel_lcdfb_start_clock(sinfo); atmel_lcdfb_start(sinfo); if (sinfo->atmel_lcdfb_power_control) sinfo->atmel_lcdfb_power_control(1); lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, sinfo->saved_lcdcon); /* Enable FIFO & DMA errors */ lcdc_writel(sinfo, ATMEL_LCDC_IER, ATMEL_LCDC_UFLWI | ATMEL_LCDC_OWRI | ATMEL_LCDC_MERI); return 0; } #else #define atmel_lcdfb_suspend NULL #define atmel_lcdfb_resume NULL #endif static struct platform_driver atmel_lcdfb_driver = { .remove = __exit_p(atmel_lcdfb_remove), .suspend = atmel_lcdfb_suspend, .resume = atmel_lcdfb_resume, .driver = { .name = "atmel_lcdfb", .owner = THIS_MODULE, }, }; static int __init atmel_lcdfb_init(void) { return platform_driver_probe(&atmel_lcdfb_driver, atmel_lcdfb_probe); } static void __exit atmel_lcdfb_exit(void) { platform_driver_unregister(&atmel_lcdfb_driver); } module_init(atmel_lcdfb_init); module_exit(atmel_lcdfb_exit); MODULE_DESCRIPTION("AT91/AT32 LCD Controller framebuffer driver"); MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>"); MODULE_LICENSE("GPL");