blizzard.c

Linux环境下视频显示卡设备的驱动程序源代码

		t->we_cycle_time = t->we_off_time;
	t->re_cycle_time = round_to_extif_ticks(2 * systim + 2000, div);
	if (t->re_cycle_time < t->re_off_time)
		t->re_cycle_time = t->re_off_time;
	t->cs_pulse_width = 0;

	dev_dbg(blizzard.fbdev->dev, "[reg]cson %d csoff %d reon %d reoff %d\n",
		 t->cs_on_time, t->cs_off_time, t->re_on_time, t->re_off_time);
	dev_dbg(blizzard.fbdev->dev, "[reg]weon %d weoff %d recyc %d wecyc %d\n",
		 t->we_on_time, t->we_off_time, t->re_cycle_time,
		 t->we_cycle_time);
	dev_dbg(blizzard.fbdev->dev, "[reg]rdaccess %d cspulse %d\n",
		 t->access_time, t->cs_pulse_width);

	return blizzard.extif->convert_timings(t);
}

static int calc_lut_timing(unsigned long sysclk, int div)
{
	struct extif_timings *t;
	unsigned long systim;

	/* CSOnTime 0, WEOnTime 2 ns, REOnTime 2 ns,
	 * AccessTime 2 ns + 4 * SYSCLK + 26 (lut),
	 * WEOffTime = WEOnTime + 1 ns,
	 * REOffTime = REOnTime + 4*SYSCLK + 26 ns (lut),
	 * CSOffTime = REOffTime + 1 ns
	 * ReadCycle = 2ns + 4*SYSCLK + 26 ns (lut),
	 * WriteCycle = 2*SYSCLK + 2 ns,
	 * CSPulseWidth = 10 ns */

	systim = 1000000000 / (sysclk / 1000);
	dev_dbg(blizzard.fbdev->dev,
		"Blizzard systim %lu ps extif_clk_period %u div %d\n",
		systim, blizzard.extif_clk_period, div);

	t = &blizzard.lut_timings;
	memset(t, 0, sizeof(*t));

	t->clk_div = div;

	t->cs_on_time = 0;
	t->we_on_time = round_to_extif_ticks(t->cs_on_time + 2000, div);
	t->re_on_time = round_to_extif_ticks(t->cs_on_time + 2000, div);
	t->access_time = round_to_extif_ticks(t->re_on_time + 4 * systim +
					      26000, div);
	t->we_off_time = round_to_extif_ticks(t->we_on_time + 1000, div);
	t->re_off_time = round_to_extif_ticks(t->re_on_time + 4 * systim +
					      26000, div);
	t->cs_off_time = round_to_extif_ticks(t->re_off_time + 1000, div);
	t->we_cycle_time = round_to_extif_ticks(2 * systim + 2000, div);
	if (t->we_cycle_time < t->we_off_time)
		t->we_cycle_time = t->we_off_time;
	t->re_cycle_time = round_to_extif_ticks(2000 + 4 * systim + 26000, div);
	if (t->re_cycle_time < t->re_off_time)
		t->re_cycle_time = t->re_off_time;
	t->cs_pulse_width = 0;

	dev_dbg(blizzard.fbdev->dev,
		 "[lut]cson %d csoff %d reon %d reoff %d\n",
		 t->cs_on_time, t->cs_off_time, t->re_on_time, t->re_off_time);
	dev_dbg(blizzard.fbdev->dev,
		 "[lut]weon %d weoff %d recyc %d wecyc %d\n",
		 t->we_on_time, t->we_off_time, t->re_cycle_time,
		 t->we_cycle_time);
	dev_dbg(blizzard.fbdev->dev, "[lut]rdaccess %d cspulse %d\n",
		 t->access_time, t->cs_pulse_width);

	return blizzard.extif->convert_timings(t);
}

static int calc_extif_timings(unsigned long sysclk, int *extif_mem_div)
{
	int max_clk_div;
	int div;

	blizzard.extif->get_clk_info(&blizzard.extif_clk_period, &max_clk_div);
	for (div = 1; div <= max_clk_div; div++) {
		if (calc_reg_timing(sysclk, div) == 0)
			break;
	}
	if (div > max_clk_div) {
		dev_dbg(blizzard.fbdev->dev, "reg timing failed\n");
		goto err;
	}
	*extif_mem_div = div;

	for (div = 1; div <= max_clk_div; div++) {
		if (calc_lut_timing(sysclk, div) == 0)
			break;
	}

	if (div > max_clk_div)
		goto err;

	blizzard.extif_clk_div = div;

	return 0;
err:
	dev_err(blizzard.fbdev->dev, "can't setup timings\n");
	return -1;
}

static void calc_blizzard_clk_rates(unsigned long ext_clk,
				unsigned long *sys_clk, unsigned long *pix_clk)
{
	int pix_clk_src;
	int sys_div = 0, sys_mul = 0;
	int pix_div;

	pix_clk_src = blizzard_read_reg(BLIZZARD_CLK_SRC);
	pix_div = ((pix_clk_src >> 3) & 0x1f) + 1;
	if ((pix_clk_src & (0x3 << 1)) == 0) {
		/* Source is the PLL */
		sys_div = (blizzard_read_reg(BLIZZARD_PLL_DIV) & 0x3f) + 1;
		sys_mul = blizzard_read_reg(BLIZZARD_PLL_CLOCK_SYNTH_0);
		sys_mul |= ((blizzard_read_reg(BLIZZARD_PLL_CLOCK_SYNTH_1)
				& 0x0f)	<< 11);
		*sys_clk = ext_clk * sys_mul / sys_div;
	} else	/* else source is ext clk, or oscillator */
		*sys_clk = ext_clk;

	*pix_clk = *sys_clk / pix_div;			/* HZ */
	dev_dbg(blizzard.fbdev->dev,
		"ext_clk %ld pix_src %d pix_div %d sys_div %d sys_mul %d\n",
		ext_clk, pix_clk_src & (0x3 << 1), pix_div, sys_div, sys_mul);
	dev_dbg(blizzard.fbdev->dev, "sys_clk %ld pix_clk %ld\n",
		*sys_clk, *pix_clk);
}

static int setup_tearsync(unsigned long pix_clk, int extif_div)
{
	int hdisp, vdisp;
	int hndp, vndp;
	int hsw, vsw;
	int hs, vs;
	int hs_pol_inv, vs_pol_inv;
	int use_hsvs, use_ndp;
	u8  b;

	hsw = blizzard_read_reg(BLIZZARD_HSW);
	vsw = blizzard_read_reg(BLIZZARD_VSW);
	hs_pol_inv = !(hsw & 0x80);
	vs_pol_inv = !(vsw & 0x80);
	hsw = hsw & 0x7f;
	vsw = vsw & 0x3f;

	hdisp = blizzard_read_reg(BLIZZARD_HDISP) * 8;
	vdisp = blizzard_read_reg(BLIZZARD_VDISP0) +
		((blizzard_read_reg(BLIZZARD_VDISP1) & 0x3) << 8);

	hndp = blizzard_read_reg(BLIZZARD_HNDP) & 0x3f;
	vndp = blizzard_read_reg(BLIZZARD_VNDP);

	/* time to transfer one pixel (16bpp) in ps */
	blizzard.pix_tx_time = blizzard.reg_timings.we_cycle_time;
	if (blizzard.extif->get_max_tx_rate != NULL) {
		/* The external interface might have a rate limitation,
		 * if so, we have to maximize our transfer rate.
		 */
		unsigned long min_tx_time;
		unsigned long max_tx_rate = blizzard.extif->get_max_tx_rate();

		dev_dbg(blizzard.fbdev->dev, "max_tx_rate %ld HZ\n",
			max_tx_rate);
		min_tx_time = 1000000000 / (max_tx_rate / 1000);  /* ps */
		if (blizzard.pix_tx_time < min_tx_time)
			blizzard.pix_tx_time = min_tx_time;
	}

	/* time to update one line in ps */
	blizzard.line_upd_time = (hdisp + hndp) * 1000000 / (pix_clk / 1000);
	blizzard.line_upd_time *= 1000;
	if (hdisp * blizzard.pix_tx_time > blizzard.line_upd_time)
		/* transfer speed too low, we might have to use both
		 * HS and VS */
		use_hsvs = 1;
	else
		/* decent transfer speed, we'll always use only VS */
		use_hsvs = 0;

	if (use_hsvs && (hs_pol_inv || vs_pol_inv)) {
		/* HS or'ed with VS doesn't work, use the active high
		 * TE signal based on HNDP / VNDP */
		use_ndp = 1;
		hs_pol_inv = 0;
		vs_pol_inv = 0;
		hs = hndp;
		vs = vndp;
	} else {
		/* Use HS or'ed with VS as a TE signal if both are needed
		 * or VNDP if only vsync is needed. */
		use_ndp = 0;
		hs = hsw;
		vs = vsw;
		if (!use_hsvs) {
			hs_pol_inv = 0;
			vs_pol_inv = 0;
		}
	}

	hs = hs * 1000000 / (pix_clk / 1000);		  /* ps */
	hs *= 1000;

	vs = vs * (hdisp + hndp) * 1000000 / (pix_clk / 1000); /* ps */
	vs *= 1000;

	if (vs <= hs)
		return -EDOM;
	/* set VS to 120% of HS to minimize VS detection time */
	vs = hs * 12 / 10;
	/* minimize HS too */
	if (hs > 10000)
		hs = 10000;

	b = blizzard_read_reg(BLIZZARD_NDISP_CTRL_STATUS);
	b &= ~0x3;
	b |= use_hsvs ? 1 : 0;
	b |= (use_ndp && use_hsvs) ? 0 : 2;
	blizzard_write_reg(BLIZZARD_NDISP_CTRL_STATUS, b);

	blizzard.vsync_only = !use_hsvs;

	dev_dbg(blizzard.fbdev->dev,
		"pix_clk %ld HZ pix_tx_time %ld ps line_upd_time %ld ps\n",
		pix_clk, blizzard.pix_tx_time, blizzard.line_upd_time);
	dev_dbg(blizzard.fbdev->dev,
		"hs %d ps vs %d ps mode %d vsync_only %d\n",
		hs, vs, b & 0x3, !use_hsvs);

	return blizzard.extif->setup_tearsync(1, hs, vs,
					      hs_pol_inv, vs_pol_inv,
					      extif_div);
}

static void blizzard_get_caps(int plane, struct omapfb_caps *caps)
{
	blizzard.int_ctrl->get_caps(plane, caps);
	caps->ctrl |= OMAPFB_CAPS_MANUAL_UPDATE |
		OMAPFB_CAPS_WINDOW_PIXEL_DOUBLE |
		OMAPFB_CAPS_WINDOW_SCALE |
		OMAPFB_CAPS_WINDOW_OVERLAY;
	if (blizzard.te_connected)
		caps->ctrl |= OMAPFB_CAPS_TEARSYNC;
	caps->wnd_color |= (1 << OMAPFB_COLOR_RGB565) |
			   (1 << OMAPFB_COLOR_YUV420);
}

static void _save_regs(struct blizzard_reg_list *list, int cnt)
{
	int i;

	for (i = 0; i < cnt; i++, list++) {
		int reg;
		for (reg = list->start; reg <= list->end; reg += 2)
			blizzard_reg_cache[reg / 2] = blizzard_read_reg(reg);
	}
}

static void _restore_regs(struct blizzard_reg_list *list, int cnt)
{
	int i;

	for (i = 0; i < cnt; i++, list++) {
		int reg;
		for (reg = list->start; reg <= list->end; reg += 2)
			blizzard_write_reg(reg, blizzard_reg_cache[reg / 2]);
	}
}

static void blizzard_save_all_regs(void)
{
	_save_regs(blizzard_pll_regs, ARRAY_SIZE(blizzard_pll_regs));
	_save_regs(blizzard_gen_regs, ARRAY_SIZE(blizzard_gen_regs));
}

static void blizzard_restore_pll_regs(void)
{
	_restore_regs(blizzard_pll_regs, ARRAY_SIZE(blizzard_pll_regs));
}

static void blizzard_restore_gen_regs(void)
{
	_restore_regs(blizzard_gen_regs, ARRAY_SIZE(blizzard_gen_regs));
}

static void blizzard_suspend(void)
{
	u32 l;
	unsigned long tmo;

	if (blizzard.last_color_mode) {
		update_full_screen();
		blizzard_sync();
	}
	blizzard.update_mode_before_suspend = blizzard.update_mode;
	/* the following will disable clocks as well */
	blizzard_set_update_mode(OMAPFB_UPDATE_DISABLED);

	blizzard_save_all_regs();

	blizzard_stop_sdram();

	l = blizzard_read_reg(BLIZZARD_POWER_SAVE);
	/* Standby, Sleep. We assume we use an external clock. */
	l |= 0x03;
	blizzard_write_reg(BLIZZARD_POWER_SAVE, l);

	tmo = jiffies + msecs_to_jiffies(100);
	while (!(blizzard_read_reg(BLIZZARD_PLL_MODE) & (1 << 1))) {
		if (time_after(jiffies, tmo)) {
			dev_err(blizzard.fbdev->dev,
				"s1d1374x: sleep timeout, stopping PLL manually\n");
			l = blizzard_read_reg(BLIZZARD_PLL_MODE);
			l &= ~0x03;
			/* Disable PLL, counter function */
			l |= 0x2;
			blizzard_write_reg(BLIZZARD_PLL_MODE, l);
			break;
		}
		msleep(1);
	}

	if (blizzard.power_down != NULL)
		blizzard.power_down(blizzard.fbdev->dev);
}

static void blizzard_resume(void)
{
	u32 l;

	if (blizzard.power_up != NULL)
		blizzard.power_up(blizzard.fbdev->dev);

	l = blizzard_read_reg(BLIZZARD_POWER_SAVE);
	/* Standby, Sleep */
	l &= ~0x03;
	blizzard_write_reg(BLIZZARD_POWER_SAVE, l);

	blizzard_restore_pll_regs();
	l = blizzard_read_reg(BLIZZARD_PLL_MODE);
	l &= ~0x03;
	/* Enable PLL, counter function */
	l |= 0x1;
	blizzard_write_reg(BLIZZARD_PLL_MODE, l);

	while (!(blizzard_read_reg(BLIZZARD_PLL_DIV) & (1 << 7)))
		msleep(1);

	blizzard_restart_sdram();

	blizzard_restore_gen_regs();

	/* Enable display */
	blizzard_write_reg(BLIZZARD_DISPLAY_MODE, 0x01);

	/* the following will enable clocks as necessary */
	blizzard_set_update_mode(blizzard.update_mode_before_suspend);

	/* Force a background update */
	blizzard.zoom_on = 1;
	update_full_screen();
	blizzard_sync();
}

static int blizzard_init(struct omapfb_device *fbdev, int ext_mode,
			 struct omapfb_mem_desc *req_vram)
{
	int r = 0, i;
	u8 rev, conf;
	unsigned long ext_clk;
	int extif_div;
	unsigned long sys_clk, pix_clk;
	struct omapfb_platform_data *omapfb_conf;
	struct blizzard_platform_data *ctrl_conf;

	blizzard.fbdev = fbdev;

	BUG_ON(!fbdev->ext_if || !fbdev->int_ctrl);

	blizzard.fbdev = fbdev;
	blizzard.extif = fbdev->ext_if;
	blizzard.int_ctrl = fbdev->int_ctrl;

	omapfb_conf = fbdev->dev->platform_data;
	ctrl_conf = omapfb_conf->ctrl_platform_data;
	if (ctrl_conf == NULL || ctrl_conf->get_clock_rate == NULL) {
		dev_err(fbdev->dev, "s1d1374x: missing platform data\n");
		r = -ENOENT;
		goto err1;
	}

	blizzard.power_down = ctrl_conf->power_down;
	blizzard.power_up = ctrl_conf->power_up;

	spin_lock_init(&blizzard.req_lock);

	if ((r = blizzard.int_ctrl->init(fbdev, 1, req_vram)) < 0)
		goto err1;

	if ((r = blizzard.extif->init(fbdev)) < 0)
		goto err2;

	blizzard_ctrl.set_color_key = blizzard.int_ctrl->set_color_key;
	blizzard_ctrl.get_color_key = blizzard.int_ctrl->get_color_key;
	blizzard_ctrl.setup_mem = blizzard.int_ctrl->setup_mem;
	blizzard_ctrl.mmap = blizzard.int_ctrl->mmap;

	ext_clk = ctrl_conf->get_clock_rate(fbdev->dev);
	if ((r = calc_extif_timings(ext_clk, &extif_div)) < 0)
		goto err3;

	set_extif_timings(&blizzard.reg_timings);

	if (blizzard.power_up != NULL)
		blizzard.power_up(fbdev->dev);

	calc_blizzard_clk_rates(ext_clk, &sys_clk, &pix_clk);

	if ((r = calc_extif_timings(sys_clk, &extif_div)) < 0)
		goto err3;
	set_extif_timings(&blizzard.reg_timings);

	if (!(blizzard_read_reg(BLIZZARD_PLL_DIV) & 0x80)) {
		dev_err(fbdev->dev,
			"controller not initialized by the bootloader\n");
		r = -ENODEV;
		goto err3;
	}

	if (ctrl_conf->te_connected) {
		if ((r = setup_tearsync(pix_clk, extif_div)) < 0)
			goto err3;
		blizzard.te_connected = 1;
	}

	rev = blizzard_read_reg(BLIZZARD_REV_CODE);
	conf = blizzard_read_reg(BLIZZARD_CONFIG);

	switch (rev & 0xfc) {
	case 0x9c:
		blizzard.version = BLIZZARD_VERSION_S1D13744;
		pr_info("omapfb: s1d13744 LCD controller rev %d "
			"initialized (CNF pins %x)\n", rev & 0x03, conf & 0x07);
		break;
	case 0xa4:
		blizzard.version = BLIZZARD_VERSION_S1D13745;
		pr_info("omapfb: s1d13745 LCD controller rev %d "
			"initialized (CNF pins %x)\n", rev & 0x03, conf & 0x07);
		break;
	default:
		dev_err(fbdev->dev, "invalid s1d1374x revision %02x\n",
			rev);
		r = -ENODEV;
		goto err3;
	}

	blizzard.max_transmit_size = blizzard.extif->max_transmit_size;

	blizzard.update_mode = OMAPFB_UPDATE_DISABLED;

	blizzard.auto_update_window.x = 0;
	blizzard.auto_update_window.y = 0;
	blizzard.auto_update_window.width = fbdev->panel->x_res;
	blizzard.auto_update_window.height = fbdev->panel->y_res;
	blizzard.auto_update_window.out_x = 0;
	blizzard.auto_update_window.out_x = 0;
	blizzard.auto_update_window.out_width = fbdev->panel->x_res;
	blizzard.auto_update_window.out_height = fbdev->panel->y_res;
	blizzard.auto_update_window.format = 0;

	blizzard.screen_width = fbdev->panel->x_res;
	blizzard.screen_height = fbdev->panel->y_res;

	init_timer(&blizzard.auto_update_timer);
	blizzard.auto_update_timer.function = blizzard_update_window_auto;
	blizzard.auto_update_timer.data = 0;

	INIT_LIST_HEAD(&blizzard.free_req_list);
	INIT_LIST_HEAD(&blizzard.pending_req_list);
	for (i = 0; i < ARRAY_SIZE(blizzard.req_pool); i++)
		list_add(&blizzard.req_pool[i].entry, &blizzard.free_req_list);
	BUG_ON(i <= IRQ_REQ_POOL_SIZE);
	sema_init(&blizzard.req_sema, i - IRQ_REQ_POOL_SIZE);

	return 0;
err3:
	if (blizzard.power_down != NULL)
		blizzard.power_down(fbdev->dev);
	blizzard.extif->cleanup();
err2:
	blizzard.int_ctrl->cleanup();
err1:
	return r;
}

static void blizzard_cleanup(void)
{
	blizzard_set_update_mode(OMAPFB_UPDATE_DISABLED);
	blizzard.extif->cleanup();
	blizzard.int_ctrl->cleanup();
	if (blizzard.power_down != NULL)
		blizzard.power_down(blizzard.fbdev->dev);
}

struct lcd_ctrl blizzard_ctrl = {
	.name			= "blizzard",
	.init			= blizzard_init,
	.cleanup		= blizzard_cleanup,
	.bind_client		= blizzard_bind_client,
	.get_caps		= blizzard_get_caps,
	.set_update_mode	= blizzard_set_update_mode,
	.get_update_mode	= blizzard_get_update_mode,
	.setup_plane		= blizzard_setup_plane,
	.set_scale		= blizzard_set_scale,
	.enable_plane		= blizzard_enable_plane,
	.update_window		= blizzard_update_window_async,
	.sync			= blizzard_sync,
	.suspend		= blizzard_suspend,
	.resume			= blizzard_resume,
};