| /* |
| * 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 <linux/gfp.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 const 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_properties props; |
| struct backlight_device *bl; |
| |
| sinfo->bl_power = FB_BLANK_UNBLANK; |
| |
| if (sinfo->backlight) |
| return; |
| |
| memset(&props, 0, sizeof(struct backlight_properties)); |
| props.type = BACKLIGHT_RAW; |
| props.max_brightness = 0xff; |
| bl = backlight_device_register("backlight", &sinfo->pdev->dev, sinfo, |
| &atmel_lcdc_bl_ops, &props); |
| 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.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"); |