Orange Pi5 kernel

/*
 *  Driver for AT91 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 <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <video/of_videomode.h>
#include <video/of_display_timing.h>
#include <linux/regulator/consumer.h>
#include <video/videomode.h>
 
#include <video/atmel_lcdc.h>
 
struct atmel_lcdfb_config {
<------>bool have_alt_pixclock;
<------>bool have_hozval;
<------>bool have_intensity_bit;
};
 
 /* LCD Controller info data structure, stored in device platform_data */
struct atmel_lcdfb_info {
<------>spinlock_t		lock;
<------>struct fb_info		*info;
<------>void __iomem		*mmio;
<------>int			irq_base;
<------>struct work_struct	task;
 
<------>unsigned int		smem_len;
<------>struct platform_device	*pdev;
<------>struct clk		*bus_clk;
<------>struct clk		*lcdc_clk;
 
<------>struct backlight_device	*backlight;
<------>u8			bl_power;
<------>u8			saved_lcdcon;
 
<------>u32			pseudo_palette[16];
<------>bool			have_intensity_bit;
 
<------>struct atmel_lcdfb_pdata pdata;
 
<------>struct atmel_lcdfb_config *config;
<------>struct regulator	*reg_lcd;
};
 
struct atmel_lcdfb_power_ctrl_gpio {
<------>struct gpio_desc *gpiod;
 
<------>struct list_head list;
};
 
#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 */
 
static struct atmel_lcdfb_config at91sam9261_config = {
<------>.have_hozval		= true,
<------>.have_intensity_bit	= true,
};
 
static struct atmel_lcdfb_config at91sam9263_config = {
<------>.have_intensity_bit	= true,
};
 
static struct atmel_lcdfb_config at91sam9g10_config = {
<------>.have_hozval		= true,
};
 
static struct atmel_lcdfb_config at91sam9g45_config = {
<------>.have_alt_pixclock	= true,
};
 
static struct atmel_lcdfb_config at91sam9g45es_config = {
};
 
static struct atmel_lcdfb_config at91sam9rl_config = {
<------>.have_intensity_bit	= true,
};
 
static 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);
<------>if (contrast_ctr & ATMEL_LCDC_POL_POSITIVE)
<------><------>lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR,
<------><------><------>brightness ? contrast_ctr : 0);
<------>else
<------><------>lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, contrast_ctr);
 
<------>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)
<------><------>return;
 
<------>if (sinfo->backlight->ops) {
<------><------>sinfo->backlight->props.power = FB_BLANK_POWERDOWN;
<------><------>sinfo->backlight->ops->update_status(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)
{
<------>struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 
<------>/* contrast pwm can be 'inverted' */
<------>if (pdata->lcdcon_pol_negative)
<------><------>contrast_ctr &= ~(ATMEL_LCDC_POL_POSITIVE);
 
<------>/* 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 (pdata->lcdcon_is_backlight)
<------><------>init_backlight(sinfo);
}
 
static inline void atmel_lcdfb_power_control(struct atmel_lcdfb_info *sinfo, int on)
{
<------>int ret;
<------>struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 
<------>if (pdata->atmel_lcdfb_power_control)
<------><------>pdata->atmel_lcdfb_power_control(pdata, on);
<------>else if (sinfo->reg_lcd) {
<------><------>if (on) {
<------><------><------>ret = regulator_enable(sinfo->reg_lcd);
<------><------><------>if (ret)
<------><------><------><------>dev_err(&sinfo->pdev->dev,
<------><------><------><------><------>"lcd regulator enable failed:	%d\n", ret);
<------><------>} else {
<------><------><------>ret = regulator_disable(sinfo->reg_lcd);
<------><------><------>if (ret)
<------><------><------><------>dev_err(&sinfo->pdev->dev,
<------><------><------><------><------>"lcd regulator disable failed: %d\n", ret);
<------><------>}
<------>}
}
 
static const struct fb_fix_screeninfo atmel_lcdfb_fix __initconst = {
<------>.type		= FB_TYPE_PACKED_PIXELS,
<------>.visual		= FB_VISUAL_TRUECOLOR,
<------>.xpanstep	= 0,
<------>.ypanstep	= 1,
<------>.ywrapstep	= 0,
<------>.accel		= FB_ACCEL_NONE,
};
 
static unsigned long compute_hozval(struct atmel_lcdfb_info *sinfo,
<------><------><------><------><------><------><------>unsigned long xres)
{
<------>unsigned long lcdcon2;
<------>unsigned long value;
 
<------>if (!sinfo->config->have_hozval)
<------><------>return xres;
 
<------>lcdcon2 = lcdc_readl(sinfo, ATMEL_LCDC_LCDCON2);
<------>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)
{
<------>struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 
<------>/* Turn off the LCD controller and the DMA controller */
<------>lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
<------><------><------>pdata->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)
{
<------>struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
 
<------>lcdc_writel(sinfo, ATMEL_LCDC_DMACON, pdata->default_dmacon);
<------>lcdc_writel(sinfo, ATMEL_LCDC_PWRCON,
<------><------>(pdata->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 * info->var.bits_per_pixel / 8);
 
<------>dma_addr &= ~3UL;
 
<------>/* Set framebuffer DMA base address and pixel offset */
<------>lcdc_writel(sinfo, ATMEL_LCDC_DMABADDR1, dma_addr);
}
 
static inline void atmel_lcdfb_free_video_memory(struct atmel_lcdfb_info *sinfo)
{
<------>struct fb_info *info = sinfo->info;
 
<------>dma_free_wc(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_wc(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;
<------>struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
<------>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) {
<------><------><------>dev_err(dev, "Frame buffer is too small (%u) for screen size (need at least %u)\n",
<------><------><------><------>info->fix.smem_len, 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 16:
<------><------>/* Older SOCs use IBGR:555 rather than BGR:565. */
<------><------>if (sinfo->config->have_intensity_bit)
<------><------><------>var->green.length = 5;
<------><------>else
<------><------><------>var->green.length = 6;
 
<------><------>if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
<------><------><------>/* RGB:5X5 mode */
<------><------><------>var->red.offset = var->green.length + 5;
<------><------><------>var->blue.offset = 0;
<------><------>} else {
<------><------><------>/* BGR:5X5 mode */
<------><------><------>var->red.offset = 0;
<------><------><------>var->blue.offset = 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;
<------><------>fallthrough;
<------>case 24:
<------><------>if (pdata->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;
<------>struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
<------>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 (sinfo->config->have_alt_pixclock)
<------><------>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 = pdata->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: fallthrough;
<------><------>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(sinfo, info->var.xres);
 
<------>/* 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, ~0U);
<------>/* 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 pseudo 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;
<------>struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
<------>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) {
<------><------><------>if (sinfo->config->have_intensity_bit) {
<------><------><------><------>/* old style I+BGR:555 */
<------><------><------><------>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
<------><------><------><------> */
<------><------><------>} else {
<------><------><------><------>/* new style BGR:565 / RGB:565 */
<------><------><------><------>if (pdata->lcd_wiring_mode == ATMEL_LCDC_WIRING_RGB) {
<------><------><------><------><------>val  = ((blue >> 11) & 0x001f);
<------><------><------><------><------>val |= ((red  >>  0) & 0xf800);
<------><------><------><------>} else {
<------><------><------><------><------>val  = ((red  >> 11) & 0x001f);
<------><------><------><------><------>val |= ((blue >>  0) & 0xf800);
<------><------><------><------>}
 
<------><------><------><------>val |= ((green >>  5) & 0x07e0);
<------><------><------>}
 
<------><------><------>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 int atmel_lcdfb_blank(int blank_mode, struct fb_info *info)
{
<------>struct atmel_lcdfb_info *sinfo = info->par;
 
<------>switch (blank_mode) {
<------>case FB_BLANK_UNBLANK:
<------>case FB_BLANK_NORMAL:
<------><------>atmel_lcdfb_start(sinfo);
<------><------>break;
<------>case FB_BLANK_VSYNC_SUSPEND:
<------>case FB_BLANK_HSYNC_SUSPEND:
<------><------>break;
<------>case FB_BLANK_POWERDOWN:
<------><------>atmel_lcdfb_stop(sinfo);
<------><------>break;
<------>default:
<------><------>return -EINVAL;
<------>}
 
<------>/* let fbcon do a soft blank for us */
<------>return ((blank_mode == FB_BLANK_NORMAL) ? 1 : 0);
}
 
static const 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_blank	= atmel_lcdfb_blank,
<------>.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)
{
<------>clk_prepare_enable(sinfo->bus_clk);
<------>clk_prepare_enable(sinfo->lcdc_clk);
}
 
static void atmel_lcdfb_stop_clock(struct atmel_lcdfb_info *sinfo)
{
<------>clk_disable_unprepare(sinfo->bus_clk);
<------>clk_disable_unprepare(sinfo->lcdc_clk);
}
 
static const struct of_device_id atmel_lcdfb_dt_ids[] = {
<------>{ .compatible = "atmel,at91sam9261-lcdc" , .data = &at91sam9261_config, },
<------>{ .compatible = "atmel,at91sam9263-lcdc" , .data = &at91sam9263_config, },
<------>{ .compatible = "atmel,at91sam9g10-lcdc" , .data = &at91sam9g10_config, },
<------>{ .compatible = "atmel,at91sam9g45-lcdc" , .data = &at91sam9g45_config, },
<------>{ .compatible = "atmel,at91sam9g45es-lcdc" , .data = &at91sam9g45es_config, },
<------>{ .compatible = "atmel,at91sam9rl-lcdc" , .data = &at91sam9rl_config, },
<------>{ /* sentinel */ }
};
 
MODULE_DEVICE_TABLE(of, atmel_lcdfb_dt_ids);
 
static const char *atmel_lcdfb_wiring_modes[] = {
<------>[ATMEL_LCDC_WIRING_BGR]	= "BRG",
<------>[ATMEL_LCDC_WIRING_RGB]	= "RGB",
};
 
static int atmel_lcdfb_get_of_wiring_modes(struct device_node *np)
{
<------>const char *mode;
<------>int err, i;
 
<------>err = of_property_read_string(np, "atmel,lcd-wiring-mode", &mode);
<------>if (err < 0)
<------><------>return ATMEL_LCDC_WIRING_BGR;
 
<------>for (i = 0; i < ARRAY_SIZE(atmel_lcdfb_wiring_modes); i++)
<------><------>if (!strcasecmp(mode, atmel_lcdfb_wiring_modes[i]))
<------><------><------>return i;
 
<------>return -ENODEV;
}
 
static void atmel_lcdfb_power_control_gpio(struct atmel_lcdfb_pdata *pdata, int on)
{
<------>struct atmel_lcdfb_power_ctrl_gpio *og;
 
<------>list_for_each_entry(og, &pdata->pwr_gpios, list)
<------><------>gpiod_set_value(og->gpiod, on);
}
 
static int atmel_lcdfb_of_init(struct atmel_lcdfb_info *sinfo)
{
<------>struct fb_info *info = sinfo->info;
<------>struct atmel_lcdfb_pdata *pdata = &sinfo->pdata;
<------>struct fb_var_screeninfo *var = &info->var;
<------>struct device *dev = &sinfo->pdev->dev;
<------>struct device_node *np =dev->of_node;
<------>struct device_node *display_np;
<------>struct atmel_lcdfb_power_ctrl_gpio *og;
<------>bool is_gpio_power = false;
<------>struct fb_videomode fb_vm;
<------>struct gpio_desc *gpiod;
<------>struct videomode vm;
<------>int ret;
<------>int i;
 
<------>sinfo->config = (struct atmel_lcdfb_config*)
<------><------>of_match_device(atmel_lcdfb_dt_ids, dev)->data;
 
<------>display_np = of_parse_phandle(np, "display", 0);
<------>if (!display_np) {
<------><------>dev_err(dev, "failed to find display phandle\n");
<------><------>return -ENOENT;
<------>}
 
<------>ret = of_property_read_u32(display_np, "bits-per-pixel", &var->bits_per_pixel);
<------>if (ret < 0) {
<------><------>dev_err(dev, "failed to get property bits-per-pixel\n");
<------><------>goto put_display_node;
<------>}
 
<------>ret = of_property_read_u32(display_np, "atmel,guard-time", &pdata->guard_time);
<------>if (ret < 0) {
<------><------>dev_err(dev, "failed to get property atmel,guard-time\n");
<------><------>goto put_display_node;
<------>}
 
<------>ret = of_property_read_u32(display_np, "atmel,lcdcon2", &pdata->default_lcdcon2);
<------>if (ret < 0) {
<------><------>dev_err(dev, "failed to get property atmel,lcdcon2\n");
<------><------>goto put_display_node;
<------>}
 
<------>ret = of_property_read_u32(display_np, "atmel,dmacon", &pdata->default_dmacon);
<------>if (ret < 0) {
<------><------>dev_err(dev, "failed to get property bits-per-pixel\n");
<------><------>goto put_display_node;
<------>}
 
<------>INIT_LIST_HEAD(&pdata->pwr_gpios);
<------>for (i = 0; i < gpiod_count(dev, "atmel,power-control"); i++) {
<------><------>ret = -ENOMEM;
<------><------>gpiod = devm_gpiod_get_index(dev, "atmel,power-control",
<------><------><------><------><------>     i, GPIOD_ASIS);
<------><------>if (IS_ERR(gpiod))
<------><------><------>continue;
 
<------><------>og = devm_kzalloc(dev, sizeof(*og), GFP_KERNEL);
<------><------>if (!og)
<------><------><------>goto put_display_node;
 
<------><------>og->gpiod = gpiod;
<------><------>is_gpio_power = true;
 
<------><------>ret = gpiod_direction_output(gpiod, gpiod_is_active_low(gpiod));
<------><------>if (ret) {
<------><------><------>dev_err(dev, "set direction output gpio atmel,power-control[%d] failed\n", i);
<------><------><------>goto put_display_node;
<------><------>}
<------><------>list_add(&og->list, &pdata->pwr_gpios);
<------>}
 
<------>if (is_gpio_power)
<------><------>pdata->atmel_lcdfb_power_control = atmel_lcdfb_power_control_gpio;
 
<------>ret = atmel_lcdfb_get_of_wiring_modes(display_np);
<------>if (ret < 0) {
<------><------>dev_err(dev, "invalid atmel,lcd-wiring-mode\n");
<------><------>goto put_display_node;
<------>}
<------>pdata->lcd_wiring_mode = ret;
 
<------>pdata->lcdcon_is_backlight = of_property_read_bool(display_np, "atmel,lcdcon-backlight");
<------>pdata->lcdcon_pol_negative = of_property_read_bool(display_np, "atmel,lcdcon-backlight-inverted");
 
<------>ret = of_get_videomode(display_np, &vm, OF_USE_NATIVE_MODE);
<------>if (ret) {
<------><------>dev_err(dev, "failed to get videomode from DT\n");
<------><------>goto put_display_node;
<------>}
 
<------>ret = fb_videomode_from_videomode(&vm, &fb_vm);
<------>if (ret < 0)
<------><------>goto put_display_node;
 
<------>fb_add_videomode(&fb_vm, &info->modelist);
 
put_display_node:
<------>of_node_put(display_np);
<------>return ret;
}
 
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 resource *regs = NULL;
<------>struct resource *map = NULL;
<------>struct fb_modelist *modelist;
<------>int ret;
 
<------>dev_dbg(dev, "%s BEGIN\n", __func__);
 
<------>ret = -ENOMEM;
<------>info = framebuffer_alloc(sizeof(struct atmel_lcdfb_info), dev);
<------>if (!info)
<------><------>goto out;
 
<------>sinfo = info->par;
<------>sinfo->pdev = pdev;
<------>sinfo->info = info;
 
<------>INIT_LIST_HEAD(&info->modelist);
 
<------>if (!pdev->dev.of_node) {
<------><------>dev_err(dev, "cannot get default configuration\n");
<------><------>goto free_info;
<------>}
 
<------>ret = atmel_lcdfb_of_init(sinfo);
<------>if (ret)
<------><------>goto free_info;
 
<------>ret = -ENODEV;
<------>if (!sinfo->config)
<------><------>goto free_info;
 
<------>sinfo->reg_lcd = devm_regulator_get(&pdev->dev, "lcd");
<------>if (IS_ERR(sinfo->reg_lcd))
<------><------>sinfo->reg_lcd = NULL;
 
<------>info->flags = FBINFO_DEFAULT | FBINFO_PARTIAL_PAN_OK |
<------><------>      FBINFO_HWACCEL_YPAN;
<------>info->pseudo_palette = sinfo->pseudo_palette;
<------>info->fbops = &atmel_lcdfb_ops;
 
<------>info->fix = atmel_lcdfb_fix;
<------>strcpy(info->fix.id, sinfo->pdev->name);
 
<------>/* Enable LCDC Clocks */
<------>sinfo->bus_clk = clk_get(dev, "hclk");
<------>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);
 
<------>modelist = list_first_entry(&info->modelist,
<------><------><------>struct fb_modelist, list);
<------>fb_videomode_to_var(&info->var, &modelist->mode);
 
<------>atmel_lcdfb_check_var(&info->var, info);
 
<------>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) {
<------><------>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 = resource_size(map);
<------><------>if (!request_mem_region(info->fix.smem_start,
<------><------><------><------><------>info->fix.smem_len, pdev->name)) {
<------><------><------>ret = -EBUSY;
<------><------><------>goto stop_clk;
<------><------>}
 
<------><------>info->screen_base = ioremap_wc(info->fix.smem_start,
<------><------><------><------><------>       info->fix.smem_len);
<------><------>if (!info->screen_base) {
<------><------><------>ret = -ENOMEM;
<------><------><------>goto release_intmem;
<------><------>}
 
<------><------>/*
<------><------> * Don't clear the framebuffer -- someone may have set
<------><------> * up a splash image.
<------><------> */
<------>} else {
<------><------>/* allocate 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 = resource_size(regs);
 
<------>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");
<------><------>ret = -ENOMEM;
<------><------>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;
<------>}
 
<------>ret = atmel_lcdfb_set_par(info);
<------>if (ret < 0) {
<------><------>dev_err(dev, "set par failed: %d\n", ret);
<------><------>goto unregister_irqs;
<------>}
 
<------>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;
<------>}
 
<------>/* Power up the LCDC screen */
<------>atmel_lcdfb_power_control(sinfo, 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);
<------>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:
<------>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);
<------>atmel_lcdfb_power_control(sinfo, 0);
<------>unregister_framebuffer(info);
<------>atmel_lcdfb_stop_clock(sinfo);
<------>clk_put(sinfo->lcdc_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);
<------>}
 
<------>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, ~0U);
 
<------>sinfo->saved_lcdcon = lcdc_readl(sinfo, ATMEL_LCDC_CONTRAST_CTR);
<------>lcdc_writel(sinfo, ATMEL_LCDC_CONTRAST_CTR, 0);
<------>atmel_lcdfb_power_control(sinfo, 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);
<------>atmel_lcdfb_power_control(sinfo, 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",
<------><------>.of_match_table	= of_match_ptr(atmel_lcdfb_dt_ids),
<------>},
};
 
module_platform_driver_probe(atmel_lcdfb_driver, atmel_lcdfb_probe);
 
MODULE_DESCRIPTION("AT91 LCD Controller framebuffer driver");
MODULE_AUTHOR("Nicolas Ferre <nicolas.ferre@atmel.com>");
MODULE_LICENSE("GPL");