path: root/drivers/video/imxfb.c

/*
 *  Freescale i.MX Frame Buffer device driver
 *
 *  Copyright (C) 2004 Sascha Hauer, Pengutronix
 *   Based on acornfb.c Copyright (C) Russell King.
 *
 * 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.
 *
 * Please direct your questions and comments on this driver to the following
 * email address:
 *
 *	linux-arm-kernel@lists.arm.linux.org.uk
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/ioport.h>
#include <linux/cpufreq.h>
#include <linux/clk.h>
#include <linux/platform_device.h>
#include <linux/dma-mapping.h>
#include <linux/io.h>
#include <linux/lcd.h>
#include <linux/math64.h>
#include <linux/of.h>
#include <linux/of_device.h>

#include <linux/regulator/consumer.h>

#include <video/of_display_timing.h>
#include <video/of_videomode.h>
#include <video/videomode.h>

#include <linux/platform_data/video-imxfb.h>

/*
 * Complain if VAR is out of range.
 */
#define DEBUG_VAR 1

#if defined(CONFIG_BACKLIGHT_CLASS_DEVICE) || \
	(defined(CONFIG_BACKLIGHT_CLASS_DEVICE_MODULE) && \
		defined(CONFIG_FB_IMX_MODULE))
#define PWMR_BACKLIGHT_AVAILABLE
#endif

#define DRIVER_NAME "imx-fb"

#define LCDC_SSA	0x00

#define LCDC_SIZE	0x04
#define SIZE_XMAX(x)	((((x) >> 4) & 0x3f) << 20)

#define YMAX_MASK_IMX1	0x1ff
#define YMAX_MASK_IMX21	0x3ff

#define LCDC_VPW	0x08
#define VPW_VPW(x)	((x) & 0x3ff)

#define LCDC_CPOS	0x0C
#define CPOS_CC1	(1<<31)
#define CPOS_CC0	(1<<30)
#define CPOS_OP		(1<<28)
#define CPOS_CXP(x)	(((x) & 3ff) << 16)

#define LCDC_LCWHB	0x10
#define LCWHB_BK_EN	(1<<31)
#define LCWHB_CW(w)	(((w) & 0x1f) << 24)
#define LCWHB_CH(h)	(((h) & 0x1f) << 16)
#define LCWHB_BD(x)	((x) & 0xff)

#define LCDC_LCHCC	0x14

#define LCDC_PCR	0x18

#define LCDC_HCR	0x1C
#define HCR_H_WIDTH(x)	(((x) & 0x3f) << 26)
#define HCR_H_WAIT_1(x)	(((x) & 0xff) << 8)
#define HCR_H_WAIT_2(x)	((x) & 0xff)

#define LCDC_VCR	0x20
#define VCR_V_WIDTH(x)	(((x) & 0x3f) << 26)
#define VCR_V_WAIT_1(x)	(((x) & 0xff) << 8)
#define VCR_V_WAIT_2(x)	((x) & 0xff)

#define LCDC_POS	0x24
#define POS_POS(x)	((x) & 1f)

#define LCDC_LSCR1	0x28
/* bit fields in imxfb.h */

#define LCDC_PWMR	0x2C
/* bit fields in imxfb.h */

#define LCDC_DMACR	0x30
/* bit fields in imxfb.h */

#define LCDC_RMCR	0x34

#define RMCR_LCDC_EN_MX1	(1<<1)

#define RMCR_SELF_REF	(1<<0)

#define LCDC_LCDICR	0x38
#define LCDICR_INT_SYN	(1<<2)
#define LCDICR_INT_CON	(1)

#define LCDC_LCDISR	0x40
#define LCDISR_UDR_ERR	(1<<3)
#define LCDISR_ERR_RES	(1<<2)
#define LCDISR_EOF	(1<<1)
#define LCDISR_BOF	(1<<0)

#define IMXFB_LSCR1_DEFAULT 0x00120300

/* Used fb-mode. Can be set on kernel command line, therefore file-static. */
static const char *fb_mode;

/*
 * These are the bitfields for each
 * display depth that we support.
 */
struct imxfb_rgb {
	struct fb_bitfield	red;
	struct fb_bitfield	green;
	struct fb_bitfield	blue;
	struct fb_bitfield	transp;
};

enum imxfb_type {
	IMX1_FB,
	IMX21_FB,
};

struct imxfb_info {
	struct platform_device  *pdev;
	void __iomem		*regs;
	struct clk		*clk_ipg;
	struct clk		*clk_ahb;
	struct clk		*clk_per;
	enum imxfb_type		devtype;
	bool			enabled;

	/*
	 * These are the addresses we mapped
	 * the framebuffer memory region to.
	 */
	dma_addr_t		map_dma;
	u_char			*map_cpu;
	u_int			map_size;

	u_char			*screen_cpu;
	dma_addr_t		screen_dma;
	u_int			palette_size;

	dma_addr_t		dbar1;
	dma_addr_t		dbar2;

	u_int			pcr;
	u_int			pwmr;
	u_int			lscr1;
	u_int			dmacr;
	u_int			cmap_inverse:1,
				cmap_static:1,
				unused:30;

	struct imx_fb_videomode *mode;
	int			num_modes;
#ifdef PWMR_BACKLIGHT_AVAILABLE
	struct backlight_device *bl;
#endif

	void (*backlight_power)(int);

	struct regulator	*lcd_pwr;
};

static struct platform_device_id imxfb_devtype[] = {
	{
		.name = "imx1-fb",
		.driver_data = IMX1_FB,
	}, {
		.name = "imx21-fb",
		.driver_data = IMX21_FB,
	}, {
		/* sentinel */
	}
};
MODULE_DEVICE_TABLE(platform, imxfb_devtype);

static struct of_device_id imxfb_of_dev_id[] = {
	{
		.compatible = "fsl,imx1-fb",
		.data = &imxfb_devtype[IMX1_FB],
	},