hwa742.c

Linux环境下视频显示卡设备的驱动程序源代码

/*
 * Epson HWA742 LCD controller driver
 *
 * Copyright (C) 2004-2005 Nokia Corporation
 * Authors:     Juha Yrjölä   <[e-mail]>
 *	        Imre Deak     <[e-mail]>
 * YUV support: Jussi Laako   <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2 of the License, or (at your
 * option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
#include <linux/module.h>
#include <linux/mm.h>
#include <linux/fb.h>
#include <linux/delay.h>
#include <linux/clk.h>

#include <mach/dma.h>
#include <mach/omapfb.h>
#include <mach/hwa742.h>

#define HWA742_REV_CODE_REG       0x0
#define HWA742_CONFIG_REG         0x2
#define HWA742_PLL_DIV_REG        0x4
#define HWA742_PLL_0_REG          0x6
#define HWA742_PLL_1_REG          0x8
#define HWA742_PLL_2_REG          0xa
#define HWA742_PLL_3_REG          0xc
#define HWA742_PLL_4_REG          0xe
#define HWA742_CLK_SRC_REG        0x12
#define HWA742_PANEL_TYPE_REG     0x14
#define HWA742_H_DISP_REG         0x16
#define HWA742_H_NDP_REG          0x18
#define HWA742_V_DISP_1_REG       0x1a
#define HWA742_V_DISP_2_REG       0x1c
#define HWA742_V_NDP_REG          0x1e
#define HWA742_HS_W_REG           0x20
#define HWA742_HP_S_REG           0x22
#define HWA742_VS_W_REG           0x24
#define HWA742_VP_S_REG           0x26
#define HWA742_PCLK_POL_REG       0x28
#define HWA742_INPUT_MODE_REG     0x2a
#define HWA742_TRANSL_MODE_REG1   0x2e
#define HWA742_DISP_MODE_REG      0x34
#define HWA742_WINDOW_TYPE        0x36
#define HWA742_WINDOW_X_START_0   0x38
#define HWA742_WINDOW_X_START_1   0x3a
#define HWA742_WINDOW_Y_START_0   0x3c
#define HWA742_WINDOW_Y_START_1   0x3e
#define HWA742_WINDOW_X_END_0     0x40
#define HWA742_WINDOW_X_END_1     0x42
#define HWA742_WINDOW_Y_END_0     0x44
#define HWA742_WINDOW_Y_END_1     0x46
#define HWA742_MEMORY_WRITE_LSB   0x48
#define HWA742_MEMORY_WRITE_MSB   0x49
#define HWA742_MEMORY_READ_0      0x4a
#define HWA742_MEMORY_READ_1      0x4c
#define HWA742_MEMORY_READ_2      0x4e
#define HWA742_POWER_SAVE         0x56
#define HWA742_NDP_CTRL           0x58

#define HWA742_AUTO_UPDATE_TIME		(HZ / 20)

/* Reserve 4 request slots for requests in irq context */
#define REQ_POOL_SIZE			24
#define IRQ_REQ_POOL_SIZE		4

#define REQ_FROM_IRQ_POOL 0x01

#define REQ_COMPLETE	0
#define REQ_PENDING	1

struct update_param {
	int	x, y, width, height;
	int	color_mode;
	int	flags;
};

struct hwa742_request {
	struct list_head entry;
	unsigned int	 flags;

	int		 (*handler)(struct hwa742_request *req);
	void		 (*complete)(void *data);
	void		 *complete_data;

	union {
		struct update_param	update;
		struct completion	*sync;
	} par;
};

struct {
	enum omapfb_update_mode	update_mode;
	enum omapfb_update_mode	update_mode_before_suspend;

	struct timer_list	auto_update_timer;
	int			stop_auto_update;
	struct omapfb_update_window	auto_update_window;
	unsigned		te_connected:1;
	unsigned		vsync_only:1;

	struct hwa742_request	req_pool[REQ_POOL_SIZE];
	struct list_head	pending_req_list;
	struct list_head	free_req_list;
	struct semaphore	req_sema;
	spinlock_t		req_lock;

	struct extif_timings	reg_timings, lut_timings;

	int			prev_color_mode;
	int			prev_flags;
	int			window_type;

	u32			max_transmit_size;
	u32			extif_clk_period;
	unsigned long		pix_tx_time;
	unsigned long		line_upd_time;


	struct omapfb_device	*fbdev;
	struct lcd_ctrl_extif	*extif;
	struct lcd_ctrl		*int_ctrl;

	void			(*power_up)(struct device *dev);
	void			(*power_down)(struct device *dev);
} hwa742;

struct lcd_ctrl hwa742_ctrl;

static u8 hwa742_read_reg(u8 reg)
{
	u8 data;

	hwa742.extif->set_bits_per_cycle(8);
	hwa742.extif->write_command(&reg, 1);
	hwa742.extif->read_data(&data, 1);

	return data;
}

static void hwa742_write_reg(u8 reg, u8 data)
{
	hwa742.extif->set_bits_per_cycle(8);
	hwa742.extif->write_command(&reg, 1);
	hwa742.extif->write_data(&data, 1);
}

static void set_window_regs(int x_start, int y_start, int x_end, int y_end)
{
	u8 tmp[8];
	u8 cmd;

	x_end--;
	y_end--;
	tmp[0] = x_start;
	tmp[1] = x_start >> 8;
	tmp[2] = y_start;
	tmp[3] = y_start >> 8;
	tmp[4] = x_end;
	tmp[5] = x_end >> 8;
	tmp[6] = y_end;
	tmp[7] = y_end >> 8;

	hwa742.extif->set_bits_per_cycle(8);
	cmd = HWA742_WINDOW_X_START_0;

	hwa742.extif->write_command(&cmd, 1);

	hwa742.extif->write_data(tmp, 8);
}

static void set_format_regs(int conv, int transl, int flags)
{
	if (flags & OMAPFB_FORMAT_FLAG_DOUBLE) {
		hwa742.window_type = ((hwa742.window_type & 0xfc) | 0x01);
#ifdef VERBOSE
		dev_dbg(hwa742.fbdev->dev, "hwa742: enabled pixel doubling\n");
#endif
	} else {
		hwa742.window_type = (hwa742.window_type & 0xfc);
#ifdef VERBOSE
		dev_dbg(hwa742.fbdev->dev, "hwa742: disabled pixel doubling\n");
#endif
	}

	hwa742_write_reg(HWA742_INPUT_MODE_REG, conv);
	hwa742_write_reg(HWA742_TRANSL_MODE_REG1, transl);
	hwa742_write_reg(HWA742_WINDOW_TYPE, hwa742.window_type);
}

static void enable_tearsync(int y, int width, int height, int screen_height,
			    int force_vsync)
{
	u8 b;

	b = hwa742_read_reg(HWA742_NDP_CTRL);
	b |= 1 << 2;
	hwa742_write_reg(HWA742_NDP_CTRL, b);

	if (likely(hwa742.vsync_only || force_vsync)) {
		hwa742.extif->enable_tearsync(1, 0);
		return;
	}

	if (width * hwa742.pix_tx_time < hwa742.line_upd_time) {
		hwa742.extif->enable_tearsync(1, 0);
		return;
	}

	if ((width * hwa742.pix_tx_time / 1000) * height <
	    (y + height) * (hwa742.line_upd_time / 1000)) {
		hwa742.extif->enable_tearsync(1, 0);
		return;
	}

	hwa742.extif->enable_tearsync(1, y + 1);
}

static void disable_tearsync(void)
{
	u8 b;

	hwa742.extif->enable_tearsync(0, 0);

	b = hwa742_read_reg(HWA742_NDP_CTRL);
	b &= ~(1 << 2);
	hwa742_write_reg(HWA742_NDP_CTRL, b);
}

static inline struct hwa742_request *alloc_req(void)
{
	unsigned long flags;
	struct hwa742_request *req;
	int req_flags = 0;

	if (!in_interrupt())
		down(&hwa742.req_sema);
	else
		req_flags = REQ_FROM_IRQ_POOL;

	spin_lock_irqsave(&hwa742.req_lock, flags);
	BUG_ON(list_empty(&hwa742.free_req_list));
	req = list_entry(hwa742.free_req_list.next,
			 struct hwa742_request, entry);
	list_del(&req->entry);
	spin_unlock_irqrestore(&hwa742.req_lock, flags);

	INIT_LIST_HEAD(&req->entry);
	req->flags = req_flags;

	return req;
}

static inline void free_req(struct hwa742_request *req)
{
	unsigned long flags;

	spin_lock_irqsave(&hwa742.req_lock, flags);

	list_del(&req->entry);
	list_add(&req->entry, &hwa742.free_req_list);
	if (!(req->flags & REQ_FROM_IRQ_POOL))
		up(&hwa742.req_sema);

	spin_unlock_irqrestore(&hwa742.req_lock, flags);
}

static void process_pending_requests(void)
{
	unsigned long flags;

	spin_lock_irqsave(&hwa742.req_lock, flags);

	while (!list_empty(&hwa742.pending_req_list)) {
		struct hwa742_request *req;
		void (*complete)(void *);
		void *complete_data;

		req = list_entry(hwa742.pending_req_list.next,
				 struct hwa742_request, entry);
		spin_unlock_irqrestore(&hwa742.req_lock, flags);

		if (req->handler(req) == REQ_PENDING)
			return;

		complete = req->complete;
		complete_data = req->complete_data;
		free_req(req);

		if (complete)
			complete(complete_data);

		spin_lock_irqsave(&hwa742.req_lock, flags);
	}

	spin_unlock_irqrestore(&hwa742.req_lock, flags);
}

static void submit_req_list(struct list_head *head)
{
	unsigned long flags;
	int process = 1;

	spin_lock_irqsave(&hwa742.req_lock, flags);
	if (likely(!list_empty(&hwa742.pending_req_list)))
		process = 0;
	list_splice_init(head, hwa742.pending_req_list.prev);
	spin_unlock_irqrestore(&hwa742.req_lock, flags);

	if (process)
		process_pending_requests();
}

static void request_complete(void *data)
{
	struct hwa742_request	*req = (struct hwa742_request *)data;
	void			(*complete)(void *);
	void			*complete_data;

	complete = req->complete;
	complete_data = req->complete_data;

	free_req(req);

	if (complete)
		complete(complete_data);

	process_pending_requests();
}

static int send_frame_handler(struct hwa742_request *req)
{
	struct update_param *par = &req->par.update;
	int x = par->x;
	int y = par->y;
	int w = par->width;
	int h = par->height;
	int bpp;
	int conv, transl;
	unsigned long offset;
	int color_mode = par->color_mode;
	int flags = par->flags;
	int scr_width = hwa742.fbdev->panel->x_res;
	int scr_height = hwa742.fbdev->panel->y_res;

#ifdef VERBOSE
	dev_dbg(hwa742.fbdev->dev, "x %d y %d w %d h %d scr_width %d "
		"color_mode %d flags %d\n",
		x, y, w, h, scr_width, color_mode, flags);
#endif

	switch (color_mode) {
	case OMAPFB_COLOR_YUV422:
		bpp = 16;
		conv = 0x08;
		transl = 0x25;
		break;
	case OMAPFB_COLOR_YUV420:
		bpp = 12;
		conv = 0x09;
		transl = 0x25;
		break;
	case OMAPFB_COLOR_RGB565:
		bpp = 16;
		conv = 0x01;
		transl = 0x05;
		break;
	default:
		return -EINVAL;
	}

	if (hwa742.prev_flags != flags ||
	    hwa742.prev_color_mode != color_mode) {
		set_format_regs(conv, transl, flags);
		hwa742.prev_color_mode = color_mode;
		hwa742.prev_flags = flags;
	}
	flags = req->par.update.flags;
	if (flags & OMAPFB_FORMAT_FLAG_TEARSYNC)
		enable_tearsync(y, scr_width, h, scr_height,
				flags & OMAPFB_FORMAT_FLAG_FORCE_VSYNC);
	else
		disable_tearsync();

	set_window_regs(x, y, x + w, y + h);

	offset = (scr_width * y + x) * bpp / 8;

	hwa742.int_ctrl->setup_plane(OMAPFB_PLANE_GFX,
			OMAPFB_CHANNEL_OUT_LCD, offset, scr_width, 0, 0, w, h,
			color_mode);

	hwa742.extif->set_bits_per_cycle(16);

	hwa742.int_ctrl->enable_plane(OMAPFB_PLANE_GFX, 1);
	hwa742.extif->transfer_area(w, h, request_complete, req);

	return REQ_PENDING;
}

static void send_frame_complete(void *data)
{
	hwa742.int_ctrl->enable_plane(OMAPFB_PLANE_GFX, 0);
}

#define ADD_PREQ(_x, _y, _w, _h) do {		\
	req = alloc_req();			\
	req->handler	= send_frame_handler;	\
	req->complete	= send_frame_complete;	\
	req->par.update.x = _x;			\
	req->par.update.y = _y;			\
	req->par.update.width  = _w;		\
	req->par.update.height = _h;		\
	req->par.update.color_mode = color_mode;\
	req->par.update.flags	  = flags;	\
	list_add_tail(&req->entry, req_head);	\
} while(0)

static void create_req_list(struct omapfb_update_window *win,
			    struct list_head *req_head)
{
	struct hwa742_request *req;
	int x = win->x;
	int y = win->y;
	int width = win->width;
	int height = win->height;
	int color_mode;
	int flags;

	flags = win->format & ~OMAPFB_FORMAT_MASK;
	color_mode = win->format & OMAPFB_FORMAT_MASK;

	if (x & 1) {
		ADD_PREQ(x, y, 1, height);
		width--;
		x++;
		flags &= ~OMAPFB_FORMAT_FLAG_TEARSYNC;
	}
	if (width & ~1) {
		unsigned int xspan = width & ~1;
		unsigned int ystart = y;
		unsigned int yspan = height;

		if (xspan * height * 2 > hwa742.max_transmit_size) {
			yspan = hwa742.max_transmit_size / (xspan * 2);
			ADD_PREQ(x, ystart, xspan, yspan);
			ystart += yspan;
			yspan = height - yspan;
			flags &= ~OMAPFB_FORMAT_FLAG_TEARSYNC;
		}

		ADD_PREQ(x, ystart, xspan, yspan);
		x += xspan;
		width -= xspan;
		flags &= ~OMAPFB_FORMAT_FLAG_TEARSYNC;
	}
	if (width)
		ADD_PREQ(x, y, 1, height);
}

static void auto_update_complete(void *data)
{
	if (!hwa742.stop_auto_update)
		mod_timer(&hwa742.auto_update_timer,
			  jiffies + HWA742_AUTO_UPDATE_TIME);
}

static void hwa742_update_window_auto(unsigned long arg)
{
	LIST_HEAD(req_list);
	struct hwa742_request *last;

	create_req_list(&hwa742.auto_update_window, &req_list);
	last = list_entry(req_list.prev, struct hwa742_request, entry);

	last->complete = auto_update_complete;
	last->complete_data = NULL;

	submit_req_list(&req_list);
}

int hwa742_update_window_async(struct fb_info *fbi,
				 struct omapfb_update_window *win,
				 void (*complete_callback)(void *arg),
				 void *complete_callback_data)
{
	LIST_HEAD(req_list);
	struct hwa742_request *last;
	int r = 0;

	if (hwa742.update_mode != OMAPFB_MANUAL_UPDATE) {
		dev_dbg(hwa742.fbdev->dev, "invalid update mode\n");
		r = -EINVAL;
		goto out;
	}
	if (unlikely(win->format &
	    ~(0x03 | OMAPFB_FORMAT_FLAG_DOUBLE |
	    OMAPFB_FORMAT_FLAG_TEARSYNC | OMAPFB_FORMAT_FLAG_FORCE_VSYNC))) {
		dev_dbg(hwa742.fbdev->dev, "invalid window flag\n");
		r = -EINVAL;
		goto out;
	}

	create_req_list(win, &req_list);
	last = list_entry(req_list.prev, struct hwa742_request, entry);

	last->complete = complete_callback;
	last->complete_data = (void *)complete_callback_data;

	submit_req_list(&req_list);

out:
	return r;
}
EXPORT_SYMBOL(hwa742_update_window_async);

static int hwa742_setup_plane(int plane, int channel_out,
				  unsigned long offset, int screen_width,
				  int pos_x, int pos_y, int width, int height,
				  int color_mode)
{
	if (plane != OMAPFB_PLANE_GFX ||
	    channel_out != OMAPFB_CHANNEL_OUT_LCD)
		return -EINVAL;

	return 0;
}