drivers/video/fbdev/bf537-lq035.c

/*
 * Analog Devices Blackfin(BF537 STAMP) + SHARP TFT LCD.
 * http://docs.blackfin.uclinux.org/doku.php?id=hw:cards:tft-lcd
 *
 * Copyright 2006-2010 Analog Devices Inc.
 * Licensed under the GPL-2.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/delay.h>
#include <linux/fb.h>
#include <linux/ioport.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/gpio.h>
#include <linux/interrupt.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/device.h>
#include <linux/backlight.h>
#include <linux/lcd.h>
#include <linux/i2c.h>
#include <linux/spinlock.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/platform_device.h>

#include <asm/blackfin.h>
#include <asm/irq.h>
#include <asm/dpmc.h>
#include <asm/dma.h>
#include <asm/portmux.h>

#define NO_BL 1

#define MAX_BRIGHENESS	95
#define MIN_BRIGHENESS	5
#define NBR_PALETTE	256

static const unsigned short ppi_pins[] = {
	P_PPI0_CLK, P_PPI0_D0, P_PPI0_D1, P_PPI0_D2, P_PPI0_D3,
	P_PPI0_D4, P_PPI0_D5, P_PPI0_D6, P_PPI0_D7,
	P_PPI0_D8, P_PPI0_D9, P_PPI0_D10, P_PPI0_D11,
	P_PPI0_D12, P_PPI0_D13, P_PPI0_D14, P_PPI0_D15, 0
};

static unsigned char *fb_buffer;          /* RGB Buffer */
static unsigned long *dma_desc_table;
static int t_conf_done, lq035_open_cnt;
static DEFINE_SPINLOCK(bfin_lq035_lock);

static int landscape;
module_param(landscape, int, 0);
MODULE_PARM_DESC(landscape,
	"LANDSCAPE use 320x240 instead of Native 240x320 Resolution");

static int bgr;
module_param(bgr, int, 0);
MODULE_PARM_DESC(bgr,
	"BGR use 16-bit BGR-565 instead of RGB-565");

static int nocursor = 1;
module_param(nocursor, int, 0644);
MODULE_PARM_DESC(nocursor, "cursor enable/disable");

static unsigned long current_brightness;  /* backlight */

/* AD5280 vcomm */
static unsigned char vcomm_value = 150;
static struct i2c_client *ad5280_client;

static void set_vcomm(void)
{
	int nr;

	if (!ad5280_client)
		return;

	nr = i2c_smbus_write_byte_data(ad5280_client, 0x00, vcomm_value);
	if (nr)
		pr_err("i2c_smbus_write_byte_data fail: %d\n", nr);
}

static int ad5280_probe(struct i2c_client *client,
			const struct i2c_device_id *id)
{
	int ret;
	if (!i2c_check_functionality(client->adapter,
				     I2C_FUNC_SMBUS_BYTE_DATA)) {
		dev_err(&client->dev, "SMBUS Byte Data not Supported\n");
		return -EIO;
	}

	ret = i2c_smbus_write_byte_data(client, 0x00, vcomm_value);
	if (ret) {
		dev_err(&client->dev, "write fail: %d\n", ret);
		return ret;
	}

	ad5280_client = client;

	return 0;
}

static int ad5280_remove(struct i2c_client *client)
{
	ad5280_client = NULL;
	return 0;
}

static const struct i2c_device_id ad5280_id[] = {
	{"bf537-lq035-ad5280", 0},
	{}
};

MODULE_DEVICE_TABLE(i2c, ad5280_id);

static struct i2c_driver ad5280_driver = {
	.driver = {
		.name = "bf537-lq035-ad5280",
	},
	.probe = ad5280_probe,
	.remove = ad5280_remove,
	.id_table = ad5280_id,
};

#ifdef CONFIG_PNAV10
#define MOD GPIO_PH13

#define bfin_write_TIMER_LP_CONFIG	bfin_write_TIMER0_CONFIG
#define bfin_write_TIMER_LP_WIDTH	bfin_write_TIMER0_WIDTH
#define bfin_write_TIMER_LP_PERIOD	bfin_write_TIMER0_PERIOD
#define bfin_read_TIMER_LP_COUNTER	bfin_read_TIMER0_COUNTER
#define TIMDIS_LP			TIMDIS0
#define TIMEN_LP			TIMEN0

#define bfin_write_TIMER_SPS_CONFIG	bfin_write_TIMER1_CONFIG
#define bfin_write_TIMER_SPS_WIDTH	bfin_write_TIMER1_WIDTH
#define bfin_write_TIMER_SPS_PERIOD	bfin_write_TIMER1_PERIOD
#define TIMDIS_SPS			TIMDIS1
#define TIMEN_SPS			TIMEN1

#define bfin_write_TIMER_SP_CONFIG	bfin_write_TIMER5_CONFIG
#define bfin_write_TIMER_SP_WIDTH	bfin_write_TIMER5_WIDTH
#define bfin_write_TIMER_SP_PERIOD	bfin_write_TIMER5_PERIOD
#define TIMDIS_SP			TIMDIS5
#define TIMEN_SP			TIMEN5

#define bfin_write_TIMER_PS_CLS_CONFIG	bfin_write_TIMER2_CONFIG
#define bfin_write_TIMER_PS_CLS_WIDTH	bfin_write_TIMER2_WIDTH
#define bfin_write_TIMER_PS_CLS_PERIOD	bfin_write_TIMER2_PERIOD
#define TIMDIS_PS_CLS			TIMDIS2
#define TIMEN_PS_CLS			TIMEN2

#define bfin_write_TIMER_REV_CONFIG	bfin_write_TIMER3_CONFIG
#define bfin_write_TIMER_REV_WIDTH	bfin_write_TIMER3_WIDTH
#define bfin_write_TIMER_REV_PERIOD	bfin_write_TIMER3_PERIOD
#define TIMDIS_REV			TIMDIS3
#define TIMEN_REV			TIMEN3
#define bfin_read_TIMER_REV_COUNTER	bfin_read_TIMER3_COUNTER

#define	FREQ_PPI_CLK         (5*1024*1024)  /* PPI_CLK 5MHz */

#define TIMERS {P_TMR0, P_TMR1, P_TMR2, P_TMR3, P_TMR5, 0}

#else

#define UD      GPIO_PF13	/* Up / Down */
#define MOD     GPIO_PF10
#define LBR     GPIO_PF14	/* Left Right */

#define bfin_write_TIMER_LP_CONFIG	bfin_write_TIMER6_CONFIG
#define bfin_write_TIMER_LP_WIDTH	bfin_write_TIMER6_WIDTH
#define bfin_write_TIMER_LP_PERIOD	bfin_write_TIMER6_PERIOD
#define bfin_read_TIMER_LP_COUNTER	bfin_read_TIMER6_COUNTER
#define TIMDIS_LP			TIMDIS6
#define TIMEN_LP			TIMEN6

#define bfin_write_TIMER_SPS_CONFIG	bfin_write_TIMER1_CONFIG
#define bfin_write_TIMER_SPS_WIDTH	bfin_write_TIMER1_WIDTH
#define bfin_write_TIMER_SPS_PERIOD	bfin_write_TIMER1_PERIOD
#define TIMDIS_SPS			TIMDIS1
#define TIMEN_SPS			TIMEN1

#define bfin_write_TIMER_SP_CONFIG	bfin_write_TIMER0_CONFIG
#define bfin_write_TIMER_SP_WIDTH	bfin_write_TIMER0_WIDTH
#define bfin_write_TIMER_SP_PERIOD	bfin_write_TIMER0_PERIOD
#define TIMDIS_SP			TIMDIS0
#define TIMEN_SP			TIMEN0

#define bfin_write_TIMER_PS_CLS_CONFIG	bfin_write_TIMER7_CONFIG
#define bfin_write_TIMER_PS_CLS_WIDTH	bfin_write_TIMER7_WIDTH
#define bfin_write_TIMER_PS_CLS_PERIOD	bfin_write_TIMER7_PERIOD
#define TIMDIS_PS_CLS			TIMDIS7
#define TIMEN_PS_CLS			TIMEN7

#define bfin_write_TIMER_REV_CONFIG	bfin_write_TIMER5_CONFIG
#define bfin_write_TIMER_REV_WIDTH	bfin_write_TIMER5_WIDTH
#define bfin_write_TIMER_REV_PERIOD	bfin_write_TIMER5_PERIOD
#define TIMDIS_REV			TIMDIS5
#define TIMEN_REV			TIMEN5
#define bfin_read_TIMER_REV_COUNTER	bfin_read_TIMER5_COUNTER

#define	FREQ_PPI_CLK         (6*1000*1000)  /* PPI_CLK 6MHz */
#define TIMERS {P_TMR0, P_TMR1, P_TMR5, P_TMR6, P_TMR7, 0}

#endif

#define LCD_X_RES			240 /* Horizontal Resolution */
#define LCD_Y_RES			320 /* Vertical Resolution */

#define LCD_BBP				16  /* Bit Per Pixel */

/* the LCD and the DMA start counting differently;
 * since one starts at 0 and the other starts at 1,
 * we have a difference of 1 between START_LINES
 * and U_LINES.
 */
#define START_LINES       8   /* lines for field flyback or field blanking signal */
#define U_LINES           9   /* number of undisplayed blanking lines */

#define FRAMES_PER_SEC    (60)

#define DCLKS_PER_FRAME   (FREQ_PPI_CLK/FRAMES_PER_SEC)
#define DCLKS_PER_LINE    (DCLKS_PER_FRAME/(LCD_Y_RES+U_LINES))

#define PPI_CONFIG_VALUE  (PORT_DIR|XFR_TYPE|DLEN_16|POLS)
#define PPI_DELAY_VALUE   (0)
#define TIMER_CONFIG      (PWM_OUT|PERIOD_CNT|TIN_SEL|CLK_SEL)

#define ACTIVE_VIDEO_MEM_OFFSET	(LCD_X_RES*START_LINES*(LCD_BBP/8))
#define ACTIVE_VIDEO_MEM_SIZE	(LCD_Y_RES*LCD_X_RES*(LCD_BBP/8))
#define TOTAL_VIDEO_MEM_SIZE	((LCD_Y_RES+U_LINES)*LCD_X_RES*(LCD_BBP/8))
#define TOTAL_DMA_DESC_SIZE	(2 * sizeof(u32) * (LCD_Y_RES + U_LINES))

static void start_timers(void) /* CHECK with HW */
{
	unsigned long flags;

	local_irq_save(flags);

	bfin_write_TIMER_ENABLE(TIMEN_REV);
	SSYNC();

	while (bfin_read_TIMER_REV_COUNTER() <= 11)
		continue;
	bfin_write_TIMER_ENABLE(TIMEN_LP);
	SSYNC();

	while (bfin_read_TIMER_LP_COUNTER() < 3)
		continue;
	bfin_write_TIMER_ENABLE(TIMEN_SP|TIMEN_SPS|TIMEN_PS_CLS);
	SSYNC();
	t_conf_done = 1;
	local_irq_restore(flags);
}

static void config_timers(void)
{
	/* Stop timers */
	bfin_write_TIMER_DISABLE(TIMDIS_SP|TIMDIS_SPS|TIMDIS_REV|
				 TIMDIS_LP|TIMDIS_PS_CLS);
	SSYNC();

	/* LP, timer 6 */
	bfin_write_TIMER_LP_CONFIG(TIMER_CONFIG|PULSE_HI);
	bfin_write_TIMER_LP_WIDTH(1);

	bfin_write_TIMER_LP_PERIOD(DCLKS_PER_LINE);
	SSYNC();

	/* SPS, timer 1 */
	bfin_write_TIMER_SPS_CONFIG(TIMER_CONFIG|PULSE_HI);
	bfin_write_TIMER_SPS_WIDTH(DCLKS_PER_LINE*2);
	bfin_write_TIMER_SPS_PERIOD((DCLKS_PER_LINE * (LCD_Y_RES+U_LINES)));
	SSYNC();

	/* SP, timer 0 */
	bfin_write_TIMER_SP_CONFIG(TIMER_CONFIG|PULSE_HI);
	bfin_write_TIMER_SP_WIDTH(1);
	bfin_write_TIMER_SP_PERIOD(DCLKS_PER_LINE);
	SSYNC();

	/* PS & CLS, timer 7 */
	bfin_write_TIMER_PS_CLS_CONFIG(TIMER_CONFIG);
	bfin_write_TIMER_PS_CLS_WIDTH(LCD_X_RES + START_LINES);
	bfin_write_TIMER_PS_CLS_PERIOD(DCLKS_PER_LINE);

	SSYNC();

#ifdef NO_BL
	/* REV, timer 5 */
	bfin_write_TIMER_REV_CONFIG(TIMER_CONFIG|PULSE_HI);

	bfin_write_TIMER_REV_WIDTH(DCLKS_PER_LINE);
	bfin_write_TIMER_REV_PERIOD(DCLKS_PER_LINE*2);

	SSYNC();
#endif
}

static void config_ppi(void)
{
	bfin_write_PPI_DELAY(PPI_DELAY_VALUE);
	bfin_write_PPI_COUNT(LCD_X_RES-1);
	/* 0x10 -> PORT_CFG -> 2 or 3 frame syncs */
	bfin_write_PPI_CONTROL((PPI_CONFIG_VALUE|0x10) & (~POLS));
}

static int config_dma(void)
{
	u32 i;

	if (landscape) {

		for (i = 0; i < U_LINES; ++i) {
			/* blanking lines point to first line of fb_buffer */
			dma_desc_table[2*i] = (unsigned long)&dma_desc_table[2*i+2];
			dma_desc_table[2*i+1] = (unsigned long)fb_buffer;
		}

		for (i = U_LINES; i < U_LINES + LCD_Y_RES; ++i) {
			/* visible lines */
			dma_desc_table[2*i] = (unsigned long)&dma_desc_table[2*i+2];
			dma_desc_table[2*i+1] = (unsigned long)fb_buffer +
						(LCD_Y_RES+U_LINES-1-i)*2;
		}

		/* last descriptor points to first */
		dma_desc_table[2*(LCD_Y_RES+U_LINES-1)] = (unsigned long)&dma_desc_table[0];

		set_dma_x_count(CH_PPI, LCD_X_RES);
		set_dma_x_modify(CH_PPI, LCD_Y_RES * (LCD_BBP / 8));
		set_dma_y_count(CH_PPI, 0);
		set_dma_y_modify(CH_PPI, 0);
		set_dma_next_desc_addr(CH_PPI, (void *)dma_desc_table[0]);
		set_dma_config(CH_PPI, DMAFLOW_LARGE | NDSIZE_4 | WDSIZE_16);

	} else {

		set_dma_config(CH_PPI, set_bfin_dma_config(DIR_READ,
				DMA_FLOW_AUTO,
				INTR_DISABLE,
				DIMENSION_2D,
				DATA_SIZE_16,
				DMA_NOSYNC_KEEP_DMA_BUF));
		set_dma_x_count(CH_PPI, LCD_X_RES);
		set_dma_x_modify(CH_PPI, LCD_BBP / 8);
		set_dma_y_count(CH_PPI, LCD_Y_RES+U_LINES);
		set_dma_y_modify(CH_PPI, LCD_BBP / 8);
		set_dma_start_addr(CH_PPI, (unsigned long) fb_buffer);
	}

	return 0;
}

static int request_ports(void)
{
	u16 tmr_req[] = TIMERS;

	/*
		UD:      PF13
		MOD:     PF10
		LBR:     PF14
		PPI_CLK: PF15
	*/

	if (peripheral_request_list(ppi_pins, KBUILD_MODNAME)) {
		pr_err("requesting PPI peripheral failed\n");
		return -EBUSY;
	}

	if (peripheral_request_list(tmr_req, KBUILD_MODNAME)) {
		peripheral_free_list(ppi_pins);
		pr_err("requesting timer peripheral failed\n");
		return -EBUSY;
	}

#if (defined(UD) && defined(LBR))
	if (gpio_request_one(UD, GPIOF_OUT_INIT_LOW, KBUILD_MODNAME)) {
		pr_err("requesting GPIO %d failed\n", UD);
		return -EBUSY;
	}

	if (gpio_request_one(LBR, GPIOF_OUT_INIT_HIGH, KBUILD_MODNAME)) {
		pr_err("requesting GPIO %d failed\n", LBR);
		gpio_free(UD);
		return -EBUSY;
	}
#endif

	if (gpio_request_one(MOD, GPIOF_OUT_INIT_HIGH, KBUILD_MODNAME)) {
		pr_err("requesting GPIO %d failed\n", MOD);
#if (defined(UD) && defined(LBR))
		gpio_free(LBR);
		gpio_free(UD);
#endif
		return -EBUSY;
	}

	SSYNC();
	return 0;
}

static void free_ports(void)
{
	u16 tmr_req[] = TIMERS;

	peripheral_free_list(ppi_pins);
	peripheral_free_list(tmr_req);

#if defined(UD) && defined(LBR)
	gpio_free(LBR);
	gpio_free(UD);
#endif
	gpio_free(MOD);
}

static struct fb_info bfin_lq035_fb;

static struct fb_var_screeninfo bfin_lq035_fb_defined = {
	.bits_per_pixel		= LCD_BBP,
	.activate		= FB_ACTIVATE_TEST,
	.xres			= LCD_X_RES,	/*default portrait mode RGB*/
	.yres			= LCD_Y_RES,
	.xres_virtual		= LCD_X_RES,
	.yres_virtual		= LCD_Y_RES,
	.height			= -1,
	.width			= -1,
	.left_margin		= 0,
	.right_margin		= 0,
	.upper_margin		= 0,
	.lower_margin		= 0,
	.red			= {11, 5, 0},
	.green			= {5, 6, 0},
	.blue			= {0, 5, 0},
	.transp		= {0, 0, 0},
};

static struct fb_fix_screeninfo bfin_lq035_fb_fix = {
	.id		= KBUILD_MODNAME,
	.smem_len	= ACTIVE_VIDEO_MEM_SIZE,
	.type		= FB_TYPE_PACKED_PIXELS,
	.visual		= FB_VISUAL_TRUECOLOR,
	.xpanstep	= 0,
	.ypanstep	= 0,
	.line_length	= LCD_X_RES*(LCD_BBP/8),
	.accel		= FB_ACCEL_NONE,
};


static int bfin_lq035_fb_open(struct fb_info *info, int user)
{
	unsigned long flags;

	spin_lock_irqsave(&bfin_lq035_lock, flags);
	lq035_open_cnt++;
	spin_unlock_irqrestore(&bfin_lq035_lock, flags);

	if (lq035_open_cnt <= 1) {
		bfin_write_PPI_CONTROL(0);
		SSYNC();

		set_vcomm();
		config_dma();
		config_ppi();

		/* start dma */
		enable_dma(CH_PPI);
		SSYNC();
		bfin_write_PPI_CONTROL(bfin_read_PPI_CONTROL() | PORT_EN);
		SSYNC();

		if (!t_conf_done) {
			config_timers();
			start_timers();
		}
		/* gpio_set_value(MOD,1); */
	}

	return 0;
}

static int bfin_lq035_fb_release(struct fb_info *info, int user)
{
	unsigned long flags;

	spin_lock_irqsave(&bfin_lq035_lock, flags);
	lq035_open_cnt--;
	spin_unlock_irqrestore(&bfin_lq035_lock, flags);


	if (lq035_open_cnt <= 0) {

		bfin_write_PPI_CONTROL(0);
		SSYNC();

		disable_dma(CH_PPI);
	}

	return 0;
}


static int bfin_lq035_fb_check_var(struct fb_var_screeninfo *var,
				   struct fb_info *info)
{
	switch (var->bits_per_pixel) {
	case 16:/* DIRECTCOLOUR, 64k */
		var->red.offset = info->var.red.offset;
		var->green.offset = info->var.green.offset;
		var->blue.offset = info->var.blue.offset;
		var->red.length = info->var.red.length;
		var->green.length = info->var.green.length;
		var->blue.length = info->var.blue.length;
		var->transp.offset = 0;
		var->transp.length = 0;
		var->transp.msb_right = 0;
		var->red.msb_right = 0;
		var->green.msb_right = 0;
		var->blue.msb_right = 0;
		break;
	default:
		pr_debug("%s: depth not supported: %u BPP\n", __func__,
			 var->bits_per_pixel);
		return -EINVAL;
	}

	if (info->var.xres != var->xres ||
	    info->var.yres != var->yres ||
	    info->var.xres_virtual != var->xres_virtual ||
	    info->var.yres_virtual != var->yres_virtual) {
		pr_debug("%s: Resolution not supported: X%u x Y%u\n",
			 __func__, var->xres, var->yres);
		return -EINVAL;
	}

	/*
	 *  Memory limit
	 */

	if ((info->fix.line_length * var->yres_virtual) > info->fix.smem_len) {
		pr_debug("%s: Memory Limit requested yres_virtual = %u\n",
			 __func__, var->yres_virtual);
		return -ENOMEM;
	}

	return 0;
}

static int bfin_lq035_fb_cursor(struct fb_info *info, struct fb_cursor *cursor)
{
	if (nocursor)
		return 0;
	else
		return -EINVAL;	/* just to force soft_cursor() call */
}

static int bfin_lq035_fb_setcolreg(u_int regno, u_int red, u_int green,
				   u_int blue, u_int transp,
				   struct fb_info *info)
{
	if (regno >= NBR_PALETTE)
		return -EINVAL;

	if (info->var.grayscale)
		/* grayscale = 0.30*R + 0.59*G + 0.11*B */
		red = green = blue = (red * 77 + green * 151 + blue * 28) >> 8;

	if (info->fix.visual == FB_VISUAL_TRUECOLOR) {

		u32 value;
		/* Place color in the pseudopalette */
		if (regno > 16)
			return -EINVAL;

		red   >>= (16 - info->var.red.length);
		green >>= (16 - info->var.green.length);
		blue  >>= (16 - info->var.blue.length);

		value = (red   << info->var.red.offset) |
			(green << info->var.green.offset)|
			(blue  << info->var.blue.offset);
		value &= 0xFFFF;

		((u32 *) (info->pseudo_palette))[regno] = value;

	}

	return 0;
}

static struct fb_ops bfin_lq035_fb_ops = {
	.owner			= THIS_MODULE,
	.fb_open		= bfin_lq035_fb_open,
	.fb_release		= bfin_lq035_fb_release,
	.fb_check_var		= bfin_lq035_fb_check_var,
	.fb_fillrect		= cfb_fillrect,
	.fb_copyarea		= cfb_copyarea,
	.fb_imageblit		= cfb_imageblit,
	.fb_cursor		= bfin_lq035_fb_cursor,
	.fb_setcolreg		= bfin_lq035_fb_setcolreg,
};

static int bl_get_brightness(struct backlight_device *bd)
{
	return current_brightness;
}

static const struct backlight_ops bfin_lq035fb_bl_ops = {
	.get_brightness	= bl_get_brightness,
};

static struct backlight_device *bl_dev;

static int bfin_lcd_get_power(struct lcd_device *dev)
{
	return 0;
}

static int bfin_lcd_set_power(struct lcd_device *dev, int power)
{
	return 0;
}

static int bfin_lcd_get_contrast(struct lcd_device *dev)
{
	return (int)vcomm_value;
}

static int bfin_lcd_set_contrast(struct lcd_device *dev, int contrast)
{
	if (contrast > 255)
		contrast = 255;
	if (contrast < 0)
		contrast = 0;

	vcomm_value = (unsigned char)contrast;
	set_vcomm();
	return 0;
}

static int bfin_lcd_check_fb(struct lcd_device *lcd, struct fb_info *fi)
{
	if (!fi || (fi == &bfin_lq035_fb))
		return 1;
	return 0;
}

static struct lcd_ops bfin_lcd_ops = {
	.get_power	= bfin_lcd_get_power,
	.set_power	= bfin_lcd_set_power,
	.get_contrast	= bfin_lcd_get_contrast,
	.set_contrast	= bfin_lcd_set_contrast,
	.check_fb	= bfin_lcd_check_fb,
};

static struct lcd_device *lcd_dev;

static int bfin_lq035_probe(struct platform_device *pdev)
{
	struct backlight_properties props;
	dma_addr_t dma_handle;
	int ret;

	if (request_dma(CH_PPI, KBUILD_MODNAME)) {
		pr_err("couldn't request PPI DMA\n");
		return -EFAULT;
	}

	if (request_ports()) {
		pr_err("couldn't request gpio port\n");
		ret = -EFAULT;
		goto out_ports;
	}

	fb_buffer = dma_alloc_coherent(NULL, TOTAL_VIDEO_MEM_SIZE,
				       &dma_handle, GFP_KERNEL);
	if (fb_buffer == NULL) {
		pr_err("couldn't allocate dma buffer\n");
		ret = -ENOMEM;
		goto out_dma_coherent;
	}

	if (L1_DATA_A_LENGTH)
		dma_desc_table = l1_data_sram_zalloc(TOTAL_DMA_DESC_SIZE);
	else
		dma_desc_table = dma_alloc_coherent(NULL, TOTAL_DMA_DESC_SIZE,
						    &dma_handle, 0);

	if (dma_desc_table == NULL) {
		pr_err("couldn't allocate dma descriptor\n");
		ret = -ENOMEM;
		goto out_table;
	}

	bfin_lq035_fb.screen_base = (void *)fb_buffer;
	bfin_lq035_fb_fix.smem_start = (int)fb_buffer;
	if (landscape) {
		bfin_lq035_fb_defined.xres = LCD_Y_RES;
		bfin_lq035_fb_defined.yres = LCD_X_RES;
		bfin_lq035_fb_defined.xres_virtual = LCD_Y_RES;
		bfin_lq035_fb_defined.yres_virtual = LCD_X_RES;

		bfin_lq035_fb_fix.line_length = LCD_Y_RES*(LCD_BBP/8);
	} else {
		bfin_lq035_fb.screen_base += ACTIVE_VIDEO_MEM_OFFSET;
		bfin_lq035_fb_fix.smem_start += ACTIVE_VIDEO_MEM_OFFSET;
	}

	bfin_lq035_fb_defined.green.msb_right = 0;
	bfin_lq035_fb_defined.red.msb_right   = 0;
	bfin_lq035_fb_defined.blue.msb_right  = 0;
	bfin_lq035_fb_defined.green.offset    = 5;
	bfin_lq035_fb_defined.green.length    = 6;
	bfin_lq035_fb_defined.red.length      = 5;
	bfin_lq035_fb_defined.blue.length     = 5;

	if (bgr) {
		bfin_lq035_fb_defined.red.offset  = 0;
		bfin_lq035_fb_defined.blue.offset = 11;
	} else {
		bfin_lq035_fb_defined.red.offset  = 11;
		bfin_lq035_fb_defined.blue.offset = 0;
	}

	bfin_lq035_fb.fbops = &bfin_lq035_fb_ops;
	bfin_lq035_fb.var = bfin_lq035_fb_defined;

	bfin_lq035_fb.fix = bfin_lq035_fb_fix;
	bfin_lq035_fb.flags = FBINFO_DEFAULT;


	bfin_lq035_fb.pseudo_palette = devm_kzalloc(&pdev->dev,
						    sizeof(u32) * 16,
						    GFP_KERNEL);
	if (bfin_lq035_fb.pseudo_palette == NULL) {
		pr_err("failed to allocate pseudo_palette\n");
		ret = -ENOMEM;
		goto out_table;
	}

	if (fb_alloc_cmap(&bfin_lq035_fb.cmap, NBR_PALETTE, 0) < 0) {
		pr_err("failed to allocate colormap (%d entries)\n",
			NBR_PALETTE);
		ret = -EFAULT;
		goto out_table;
	}

	if (register_framebuffer(&bfin_lq035_fb) < 0) {
		pr_err("unable to register framebuffer\n");
		ret = -EINVAL;
		goto out_reg;
	}

	i2c_add_driver(&ad5280_driver);

	memset(&props, 0, sizeof(props));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = MAX_BRIGHENESS;
	bl_dev = backlight_device_register("bf537-bl", NULL, NULL,
					   &bfin_lq035fb_bl_ops, &props);

	lcd_dev = lcd_device_register(KBUILD_MODNAME, &pdev->dev, NULL,
				      &bfin_lcd_ops);
	if (IS_ERR(lcd_dev)) {
		pr_err("unable to register lcd\n");
		ret = PTR_ERR(lcd_dev);
		goto out_lcd;
	}
	lcd_dev->props.max_contrast = 255,

	pr_info("initialized");

	return 0;
out_lcd:
	unregister_framebuffer(&bfin_lq035_fb);
out_reg:
	fb_dealloc_cmap(&bfin_lq035_fb.cmap);
out_table:
	dma_free_coherent(NULL, TOTAL_VIDEO_MEM_SIZE, fb_buffer, 0);
	fb_buffer = NULL;
out_dma_coherent:
	free_ports();
out_ports:
	free_dma(CH_PPI);
	return ret;
}

static int bfin_lq035_remove(struct platform_device *pdev)
{
	if (fb_buffer != NULL)
		dma_free_coherent(NULL, TOTAL_VIDEO_MEM_SIZE, fb_buffer, 0);

	if (L1_DATA_A_LENGTH)
		l1_data_sram_free(dma_desc_table);
	else
		dma_free_coherent(NULL, TOTAL_DMA_DESC_SIZE, NULL, 0);

	bfin_write_TIMER_DISABLE(TIMEN_SP|TIMEN_SPS|TIMEN_PS_CLS|
				 TIMEN_LP|TIMEN_REV);
	t_conf_done = 0;

	free_dma(CH_PPI);


	fb_dealloc_cmap(&bfin_lq035_fb.cmap);


	lcd_device_unregister(lcd_dev);
	backlight_device_unregister(bl_dev);

	unregister_framebuffer(&bfin_lq035_fb);
	i2c_del_driver(&ad5280_driver);

	free_ports();

	pr_info("unregistered LCD driver\n");

	return 0;
}

#ifdef CONFIG_PM
static int bfin_lq035_suspend(struct platform_device *pdev, pm_message_t state)
{
	if (lq035_open_cnt > 0) {
		bfin_write_PPI_CONTROL(0);
		SSYNC();
		disable_dma(CH_PPI);
	}

	return 0;
}

static int bfin_lq035_resume(struct platform_device *pdev)
{
	if (lq035_open_cnt > 0) {
		bfin_write_PPI_CONTROL(0);
		SSYNC();

		config_dma();
		config_ppi();

		enable_dma(CH_PPI);
		bfin_write_PPI_CONTROL(bfin_read_PPI_CONTROL() | PORT_EN);
		SSYNC();

		config_timers();
		start_timers();
	} else {
		t_conf_done = 0;
	}

	return 0;
}
#else
# define bfin_lq035_suspend	NULL
# define bfin_lq035_resume	NULL
#endif

static struct platform_driver bfin_lq035_driver = {
	.probe = bfin_lq035_probe,
	.remove = bfin_lq035_remove,
	.suspend = bfin_lq035_suspend,
	.resume = bfin_lq035_resume,
	.driver = {
		.name = KBUILD_MODNAME,
	},
};

static int __init bfin_lq035_driver_init(void)
{
	request_module("i2c-bfin-twi");
	return platform_driver_register(&bfin_lq035_driver);
}
module_init(bfin_lq035_driver_init);

static void __exit bfin_lq035_driver_cleanup(void)
{
	platform_driver_unregister(&bfin_lq035_driver);
}
module_exit(bfin_lq035_driver_cleanup);

MODULE_DESCRIPTION("SHARP LQ035Q7DB03 TFT LCD Driver");
MODULE_LICENSE("GPL");