diff options
Diffstat (limited to 'drivers/video/atmel_lcdfb.c')
| -rw-r--r-- | drivers/video/atmel_lcdfb.c | 1118 |
1 files changed, 0 insertions, 1118 deletions
diff --git a/drivers/video/atmel_lcdfb.c b/drivers/video/atmel_lcdfb.c deleted file mode 100644 index bac16345021..00000000000 --- a/drivers/video/atmel_lcdfb.c +++ /dev/null @@ -1,1118 +0,0 @@ -/* - * 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.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"); |