[PATCH v3 7/8] am335x display drivers: Import from FreeBSD

Vijay Kumar Banerjee vijaykumar9597 at gmail.com
Sat Aug 3 20:19:44 UTC 2019


---
 freebsd/sys/arm/ti/am335x/am335x_ecap.c  |  202 ++++
 freebsd/sys/arm/ti/am335x/am335x_lcd.c   | 1085 ++++++++++++++++++++++
 freebsd/sys/arm/ti/am335x/am335x_lcd.h   |   60 ++
 freebsd/sys/arm/ti/am335x/am335x_pwm.h   |   35 +
 freebsd/sys/arm/ti/am335x/am335x_pwmss.c |  165 ++++
 5 files changed, 1547 insertions(+)
 create mode 100644 freebsd/sys/arm/ti/am335x/am335x_ecap.c
 create mode 100644 freebsd/sys/arm/ti/am335x/am335x_lcd.c
 create mode 100644 freebsd/sys/arm/ti/am335x/am335x_lcd.h
 create mode 100644 freebsd/sys/arm/ti/am335x/am335x_pwm.h
 create mode 100644 freebsd/sys/arm/ti/am335x/am335x_pwmss.c

diff --git a/freebsd/sys/arm/ti/am335x/am335x_ecap.c b/freebsd/sys/arm/ti/am335x/am335x_ecap.c
new file mode 100644
index 00000000..9ebc51db
--- /dev/null
+++ b/freebsd/sys/arm/ti/am335x/am335x_ecap.c
@@ -0,0 +1,202 @@
+#include <machine/rtems-bsd-kernel-space.h>
+
+/*-
+ * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo at freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/limits.h>
+#include <sys/lock.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <rtems/bsd/sys/resource.h>
+#include <sys/rman.h>
+#include <sys/sysctl.h>
+
+#include <machine/bus.h>
+
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include "am335x_pwm.h"
+
+#define	ECAP_TSCTR		0x00
+#define	ECAP_CAP1		0x08
+#define	ECAP_CAP2		0x0C
+#define	ECAP_CAP3		0x10
+#define	ECAP_CAP4		0x14
+#define	ECAP_ECCTL2		0x2A
+#define		ECCTL2_MODE_APWM		(1 << 9)
+#define		ECCTL2_SYNCO_SEL		(3 << 6)
+#define		ECCTL2_TSCTRSTOP_FREERUN	(1 << 4)
+
+#define	ECAP_READ2(_sc, reg)	bus_read_2((_sc)->sc_mem_res, reg);
+#define	ECAP_WRITE2(_sc, reg, value)	\
+    bus_write_2((_sc)->sc_mem_res, reg, value);
+#define	ECAP_READ4(_sc, reg)	bus_read_4((_sc)->sc_mem_res, reg);
+#define	ECAP_WRITE4(_sc, reg, value)	\
+    bus_write_4((_sc)->sc_mem_res, reg, value);
+
+#define	PWM_LOCK(_sc)		mtx_lock(&(_sc)->sc_mtx)
+#define	PWM_UNLOCK(_sc)		mtx_unlock(&(_sc)->sc_mtx)
+#define	PWM_LOCK_INIT(_sc)	mtx_init(&(_sc)->sc_mtx, \
+    device_get_nameunit(_sc->sc_dev), "am335x_ecap softc", MTX_DEF)
+#define	PWM_LOCK_DESTROY(_sc)	mtx_destroy(&(_sc)->sc_mtx)
+
+static device_probe_t am335x_ecap_probe;
+static device_attach_t am335x_ecap_attach;
+static device_detach_t am335x_ecap_detach;
+
+struct am335x_ecap_softc {
+	device_t		sc_dev;
+	struct mtx		sc_mtx;
+	struct resource		*sc_mem_res;
+	int			sc_mem_rid;
+};
+
+static device_method_t am335x_ecap_methods[] = {
+	DEVMETHOD(device_probe,		am335x_ecap_probe),
+	DEVMETHOD(device_attach,	am335x_ecap_attach),
+	DEVMETHOD(device_detach,	am335x_ecap_detach),
+
+	DEVMETHOD_END
+};
+
+static driver_t am335x_ecap_driver = {
+	"am335x_ecap",
+	am335x_ecap_methods,
+	sizeof(struct am335x_ecap_softc),
+};
+
+static devclass_t am335x_ecap_devclass;
+
+/*
+ * API function to set period/duty cycles for ECAPx
+ */
+int
+am335x_pwm_config_ecap(int unit, int period, int duty)
+{
+	device_t dev;
+	struct am335x_ecap_softc *sc;
+	uint16_t reg;
+
+	dev = devclass_get_device(am335x_ecap_devclass, unit);
+	if (dev == NULL)
+		return (ENXIO);
+
+	if (duty > period)
+		return (EINVAL);
+
+	if (period == 0)
+		return (EINVAL);
+
+	sc = device_get_softc(dev);
+	PWM_LOCK(sc);
+
+	reg = ECAP_READ2(sc, ECAP_ECCTL2);
+	reg |= ECCTL2_MODE_APWM | ECCTL2_TSCTRSTOP_FREERUN | ECCTL2_SYNCO_SEL;
+	ECAP_WRITE2(sc, ECAP_ECCTL2, reg);
+
+	/* CAP3 in APWM mode is APRD shadow register */
+	ECAP_WRITE4(sc, ECAP_CAP3, period - 1);
+
+	/* CAP4 in APWM mode is ACMP shadow register */
+	ECAP_WRITE4(sc, ECAP_CAP4, duty);
+	/* Restart counter */
+	ECAP_WRITE4(sc, ECAP_TSCTR, 0);
+
+	PWM_UNLOCK(sc);
+
+	return (0);
+}
+
+static int
+am335x_ecap_probe(device_t dev)
+{
+
+	if (!ofw_bus_status_okay(dev))
+		return (ENXIO);
+
+	if (!ofw_bus_is_compatible(dev, "ti,am33xx-ecap"))
+		return (ENXIO);
+
+	device_set_desc(dev, "AM335x eCAP");
+
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+am335x_ecap_attach(device_t dev)
+{
+	struct am335x_ecap_softc *sc;
+
+	sc = device_get_softc(dev);
+	sc->sc_dev = dev;
+
+	PWM_LOCK_INIT(sc);
+
+	sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY,
+	    &sc->sc_mem_rid, RF_ACTIVE);
+	if (sc->sc_mem_res == NULL) {
+		device_printf(dev, "cannot allocate memory resources\n");
+		goto fail;
+	}
+
+	return (0);
+
+fail:
+	PWM_LOCK_DESTROY(sc);
+	return (ENXIO);
+}
+
+static int
+am335x_ecap_detach(device_t dev)
+{
+	struct am335x_ecap_softc *sc;
+
+	sc = device_get_softc(dev);
+
+	PWM_LOCK(sc);
+	if (sc->sc_mem_res)
+		bus_release_resource(dev, SYS_RES_MEMORY,
+		    sc->sc_mem_rid, sc->sc_mem_res);
+	PWM_UNLOCK(sc);
+
+	PWM_LOCK_DESTROY(sc);
+
+
+	return (0);
+}
+
+DRIVER_MODULE(am335x_ecap, am335x_pwmss, am335x_ecap_driver, am335x_ecap_devclass, 0, 0);
+MODULE_VERSION(am335x_ecap, 1);
+MODULE_DEPEND(am335x_ecap, am335x_pwmss, 1, 1, 1);
diff --git a/freebsd/sys/arm/ti/am335x/am335x_lcd.c b/freebsd/sys/arm/ti/am335x/am335x_lcd.c
new file mode 100644
index 00000000..7c0dd63e
--- /dev/null
+++ b/freebsd/sys/arm/ti/am335x/am335x_lcd.c
@@ -0,0 +1,1085 @@
+#include <machine/rtems-bsd-kernel-space.h>
+
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright 2013 Oleksandr Tymoshenko <gonzo at freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <rtems/bsd/local/opt_syscons.h>
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/kernel.h>
+#include <sys/module.h>
+#include <sys/clock.h>
+#include <sys/eventhandler.h>
+#include <sys/time.h>
+#include <sys/bus.h>
+#include <sys/lock.h>
+#include <sys/mutex.h>
+#include <rtems/bsd/sys/resource.h>
+#include <sys/rman.h>
+#include <sys/sysctl.h>
+#include <vm/vm.h>
+#include <vm/pmap.h>
+#include <sys/fbio.h>
+#include <sys/consio.h>
+
+#include <machine/bus.h>
+
+#include <dev/fdt/fdt_common.h>
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <dev/videomode/videomode.h>
+#include <dev/videomode/edidvar.h>
+
+#include <dev/fb/fbreg.h>
+#ifdef DEV_SC
+#include <dev/syscons/syscons.h>
+#else /* VT */
+#include <dev/vt/vt.h>
+#endif
+
+#include <arm/ti/ti_prcm.h>
+#include <arm/ti/ti_scm.h>
+
+#include "am335x_lcd.h"
+#include "am335x_pwm.h"
+
+#include <rtems/bsd/local/fb_if.h>
+#include <rtems/bsd/local/hdmi_if.h>
+
+#define	LCD_PID			0x00
+#define	LCD_CTRL		0x04
+#define		CTRL_DIV_MASK		0xff
+#define		CTRL_DIV_SHIFT		8
+#define		CTRL_AUTO_UFLOW_RESTART	(1 << 1)
+#define		CTRL_RASTER_MODE	1
+#define		CTRL_LIDD_MODE		0
+#define	LCD_LIDD_CTRL		0x0C
+#define	LCD_LIDD_CS0_CONF	0x10
+#define	LCD_LIDD_CS0_ADDR	0x14
+#define	LCD_LIDD_CS0_DATA	0x18
+#define	LCD_LIDD_CS1_CONF	0x1C
+#define	LCD_LIDD_CS1_ADDR	0x20
+#define	LCD_LIDD_CS1_DATA	0x24
+#define	LCD_RASTER_CTRL		0x28
+#define		RASTER_CTRL_TFT24_UNPACKED	(1 << 26)
+#define		RASTER_CTRL_TFT24		(1 << 25)
+#define		RASTER_CTRL_STN565		(1 << 24)
+#define		RASTER_CTRL_TFTPMAP		(1 << 23)
+#define		RASTER_CTRL_NIBMODE		(1 << 22)
+#define		RASTER_CTRL_PALMODE_SHIFT	20
+#define		PALETTE_PALETTE_AND_DATA	0x00
+#define		PALETTE_PALETTE_ONLY		0x01
+#define		PALETTE_DATA_ONLY		0x02
+#define		RASTER_CTRL_REQDLY_SHIFT	12
+#define		RASTER_CTRL_MONO8B		(1 << 9)
+#define		RASTER_CTRL_RBORDER		(1 << 8)
+#define		RASTER_CTRL_LCDTFT		(1 << 7)
+#define		RASTER_CTRL_LCDBW		(1 << 1)
+#define		RASTER_CTRL_LCDEN		(1 << 0)
+#define	LCD_RASTER_TIMING_0	0x2C
+#define		RASTER_TIMING_0_HBP_SHIFT	24
+#define		RASTER_TIMING_0_HFP_SHIFT	16
+#define		RASTER_TIMING_0_HSW_SHIFT	10
+#define		RASTER_TIMING_0_PPLLSB_SHIFT	4
+#define		RASTER_TIMING_0_PPLMSB_SHIFT	3
+#define	LCD_RASTER_TIMING_1	0x30
+#define		RASTER_TIMING_1_VBP_SHIFT	24
+#define		RASTER_TIMING_1_VFP_SHIFT	16
+#define		RASTER_TIMING_1_VSW_SHIFT	10
+#define		RASTER_TIMING_1_LPP_SHIFT	0
+#define	LCD_RASTER_TIMING_2	0x34
+#define		RASTER_TIMING_2_HSWHI_SHIFT	27
+#define		RASTER_TIMING_2_LPP_B10_SHIFT	26
+#define		RASTER_TIMING_2_PHSVS		(1 << 25)
+#define		RASTER_TIMING_2_PHSVS_RISE	(1 << 24)
+#define		RASTER_TIMING_2_PHSVS_FALL	(0 << 24)
+#define		RASTER_TIMING_2_IOE		(1 << 23)
+#define		RASTER_TIMING_2_IPC		(1 << 22)
+#define		RASTER_TIMING_2_IHS		(1 << 21)
+#define		RASTER_TIMING_2_IVS		(1 << 20)
+#define		RASTER_TIMING_2_ACBI_SHIFT	16
+#define		RASTER_TIMING_2_ACB_SHIFT	8
+#define		RASTER_TIMING_2_HBPHI_SHIFT	4
+#define		RASTER_TIMING_2_HFPHI_SHIFT	0
+#define	LCD_RASTER_SUBPANEL	0x38
+#define	LCD_RASTER_SUBPANEL2	0x3C
+#define	LCD_LCDDMA_CTRL		0x40
+#define		LCDDMA_CTRL_DMA_MASTER_PRIO_SHIFT		16
+#define		LCDDMA_CTRL_TH_FIFO_RDY_SHIFT	8
+#define		LCDDMA_CTRL_BURST_SIZE_SHIFT	4
+#define		LCDDMA_CTRL_BYTES_SWAP		(1 << 3)
+#define		LCDDMA_CTRL_BE			(1 << 1)
+#define		LCDDMA_CTRL_FB0_ONLY		0
+#define		LCDDMA_CTRL_FB0_FB1		(1 << 0)
+#define	LCD_LCDDMA_FB0_BASE	0x44
+#define	LCD_LCDDMA_FB0_CEILING	0x48
+#define	LCD_LCDDMA_FB1_BASE	0x4C
+#define	LCD_LCDDMA_FB1_CEILING	0x50
+#define	LCD_SYSCONFIG		0x54
+#define		SYSCONFIG_STANDBY_FORCE		(0 << 4)
+#define		SYSCONFIG_STANDBY_NONE		(1 << 4)
+#define		SYSCONFIG_STANDBY_SMART		(2 << 4)
+#define		SYSCONFIG_IDLE_FORCE		(0 << 2)
+#define		SYSCONFIG_IDLE_NONE		(1 << 2)
+#define		SYSCONFIG_IDLE_SMART		(2 << 2)
+#define	LCD_IRQSTATUS_RAW	0x58
+#define	LCD_IRQSTATUS		0x5C
+#define	LCD_IRQENABLE_SET	0x60
+#define	LCD_IRQENABLE_CLEAR	0x64
+#define		IRQ_EOF1		(1 << 9)
+#define		IRQ_EOF0		(1 << 8)
+#define		IRQ_PL			(1 << 6)
+#define		IRQ_FUF			(1 << 5)
+#define		IRQ_ACB			(1 << 3)
+#define		IRQ_SYNC_LOST		(1 << 2)
+#define		IRQ_RASTER_DONE		(1 << 1)
+#define		IRQ_FRAME_DONE		(1 << 0)
+#define	LCD_END_OF_INT_IND	0x68
+#define	LCD_CLKC_ENABLE		0x6C
+#define		CLKC_ENABLE_DMA		(1 << 2)
+#define		CLKC_ENABLE_LDID	(1 << 1)
+#define		CLKC_ENABLE_CORE	(1 << 0)
+#define	LCD_CLKC_RESET		0x70
+#define		CLKC_RESET_MAIN		(1 << 3)
+#define		CLKC_RESET_DMA		(1 << 2)
+#define		CLKC_RESET_LDID		(1 << 1)
+#define		CLKC_RESET_CORE		(1 << 0)
+
+#define	LCD_LOCK(_sc)		mtx_lock(&(_sc)->sc_mtx)
+#define	LCD_UNLOCK(_sc)		mtx_unlock(&(_sc)->sc_mtx)
+#define	LCD_LOCK_INIT(_sc)	mtx_init(&(_sc)->sc_mtx, \
+    device_get_nameunit(_sc->sc_dev), "am335x_lcd", MTX_DEF)
+#define	LCD_LOCK_DESTROY(_sc)	mtx_destroy(&(_sc)->sc_mtx);
+
+#define	LCD_READ4(_sc, reg)	bus_read_4((_sc)->sc_mem_res, reg);
+#define	LCD_WRITE4(_sc, reg, value)	\
+    bus_write_4((_sc)->sc_mem_res, reg, value);
+
+/* Backlight is controlled by eCAS interface on PWM unit 0 */
+#define	PWM_UNIT	0
+#define	PWM_PERIOD	100
+
+#define	MODE_HBP(mode)	((mode)->htotal - (mode)->hsync_end)
+#define	MODE_HFP(mode)	((mode)->hsync_start - (mode)->hdisplay)
+#define	MODE_HSW(mode)	((mode)->hsync_end - (mode)->hsync_start)
+#define	MODE_VBP(mode)	((mode)->vtotal - (mode)->vsync_end)
+#define	MODE_VFP(mode)	((mode)->vsync_start - (mode)->vdisplay)
+#define	MODE_VSW(mode)	((mode)->vsync_end - (mode)->vsync_start)
+
+#define	MAX_PIXEL_CLOCK	126000
+#define	MAX_BANDWIDTH	(1280*1024*60)
+
+struct am335x_lcd_softc {
+	device_t		sc_dev;
+	struct fb_info		sc_fb_info;
+	struct resource		*sc_mem_res;
+	struct resource		*sc_irq_res;
+	void			*sc_intr_hl;
+	struct mtx		sc_mtx;
+	int			sc_backlight;
+	struct sysctl_oid	*sc_oid;
+
+	struct panel_info	sc_panel;
+
+	/* Framebuffer */
+	bus_dma_tag_t		sc_dma_tag;
+	bus_dmamap_t		sc_dma_map;
+	size_t			sc_fb_size;
+	bus_addr_t		sc_fb_phys;
+	uint8_t			*sc_fb_base;
+
+	/* HDMI framer */
+	phandle_t		sc_hdmi_framer;
+	eventhandler_tag	sc_hdmi_evh;
+};
+
+static void
+am335x_fb_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg, int err)
+{
+	bus_addr_t *addr;
+
+	if (err)
+		return;
+
+	addr = (bus_addr_t*)arg;
+	*addr = segs[0].ds_addr;
+}
+
+static uint32_t
+am335x_lcd_calc_divisor(uint32_t reference, uint32_t freq)
+{
+	uint32_t div, i;
+	uint32_t delta, min_delta;
+
+	min_delta = freq;
+	div = 255;
+
+	/* Raster mode case: divisors are in range from 2 to 255 */
+	for (i = 2; i < 255; i++) {
+		delta = abs(reference/i - freq);
+		if (delta < min_delta) {
+			div = i;
+			min_delta = delta;
+		}
+	}
+
+	return (div);
+}
+
+static int
+am335x_lcd_sysctl_backlight(SYSCTL_HANDLER_ARGS)
+{
+	struct am335x_lcd_softc *sc = (struct am335x_lcd_softc*)arg1;
+	int error;
+	int backlight;
+
+	backlight = sc->sc_backlight;
+	error = sysctl_handle_int(oidp, &backlight, 0, req);
+
+	if (error != 0 || req->newptr == NULL)
+		return (error);
+
+	if (backlight < 0)
+		backlight = 0;
+	if (backlight > 100)
+		backlight = 100;
+
+	LCD_LOCK(sc);
+	error = am335x_pwm_config_ecap(PWM_UNIT, PWM_PERIOD,
+	    backlight*PWM_PERIOD/100);
+	if (error == 0)
+		sc->sc_backlight = backlight;
+	LCD_UNLOCK(sc);
+
+	return (error);
+}
+
+static uint32_t
+am335x_mode_vrefresh(const struct videomode *mode)
+{
+	uint32_t refresh;
+
+	/* Calculate vertical refresh rate */
+        refresh = (mode->dot_clock * 1000 / mode->htotal);
+	refresh = (refresh + mode->vtotal / 2) / mode->vtotal;
+
+	if (mode->flags & VID_INTERLACE)
+		refresh *= 2;
+	if (mode->flags & VID_DBLSCAN)
+		refresh /= 2;
+
+	return refresh;
+}
+
+static int
+am335x_mode_is_valid(const struct videomode *mode)
+{
+	uint32_t hbp, hfp, hsw;
+	uint32_t vbp, vfp, vsw;
+
+	if (mode->dot_clock > MAX_PIXEL_CLOCK)
+		return (0);
+
+	if (mode->hdisplay & 0xf)
+		return (0);
+
+	if (mode->vdisplay > 2048)
+		return (0);
+
+	/* Check ranges for timing parameters */
+	hbp = MODE_HBP(mode) - 1;
+	hfp = MODE_HFP(mode) - 1;
+	hsw = MODE_HSW(mode) - 1;
+	vbp = MODE_VBP(mode);
+	vfp = MODE_VFP(mode);
+	vsw = MODE_VSW(mode) - 1;
+
+	if (hbp > 0x3ff)
+		return (0);
+	if (hfp > 0x3ff)
+		return (0);
+	if (hsw > 0x3ff)
+		return (0);
+
+	if (vbp > 0xff)
+		return (0);
+	if (vfp > 0xff)
+		return (0);
+	if (vsw > 0x3f)
+		return (0);
+	if (mode->vdisplay*mode->hdisplay*am335x_mode_vrefresh(mode) 
+	    > MAX_BANDWIDTH)
+		return (0);
+
+	return (1);
+}
+
+static void
+am335x_read_hdmi_property(device_t dev)
+{
+	phandle_t node, xref;
+	phandle_t endpoint;
+	phandle_t hdmi_xref;
+	struct am335x_lcd_softc *sc;
+
+	sc = device_get_softc(dev);
+	node = ofw_bus_get_node(dev);
+	sc->sc_hdmi_framer = 0;
+
+	/*
+	 * Old FreeBSD way of referencing to HDMI framer
+	 */
+	if (OF_getencprop(node, "hdmi", &hdmi_xref, sizeof(hdmi_xref)) != -1) {
+		sc->sc_hdmi_framer = hdmi_xref;
+		return;
+	}
+
+	/*
+	 * Use bindings described in Linux docs:
+	 * bindings/media/video-interfaces.txt
+	 * We assume that the only endpoint in LCDC node
+	 * is HDMI framer.
+	 */
+	node = ofw_bus_find_child(node, "port");
+
+	/* No media bindings */
+	if (node == 0)
+		return;
+
+	for (endpoint = OF_child(node); endpoint != 0; endpoint = OF_peer(endpoint)) {
+		if (OF_getencprop(endpoint, "remote-endpoint", &xref, sizeof(xref)) != -1) {
+			/* port/port at 0/endpoint at 0 */
+			node = OF_node_from_xref(xref);
+			/* port/port at 0 */
+			node = OF_parent(node);
+			/* port */
+			node = OF_parent(node);
+			/* actual owner of port, in our case HDMI framer */
+			sc->sc_hdmi_framer = OF_xref_from_node(OF_parent(node));
+			if (sc->sc_hdmi_framer != 0)
+				return;
+		}
+	}
+}
+
+static int
+am335x_read_property(device_t dev, phandle_t node, const char *name, uint32_t *val)
+{
+	pcell_t cell;
+
+	if ((OF_getencprop(node, name, &cell, sizeof(cell))) <= 0) {
+		device_printf(dev, "missing '%s' attribute in LCD panel info\n",
+		    name);
+		return (ENXIO);
+	}
+
+	*val = cell;
+
+	return (0);
+}
+
+static int
+am335x_read_timing(device_t dev, phandle_t node, struct panel_info *panel)
+{
+	int error;
+	phandle_t timings_node, timing_node, native;
+
+	timings_node = ofw_bus_find_child(node, "display-timings");
+	if (timings_node == 0) {
+		device_printf(dev, "no \"display-timings\" node\n");
+		return (-1);
+	}
+
+	if (OF_searchencprop(timings_node, "native-mode", &native,
+	    sizeof(native)) == -1) {
+		device_printf(dev, "no \"native-mode\" reference in \"timings\" node\n");
+		return (-1);
+	}
+
+	timing_node = OF_node_from_xref(native);
+
+	error = 0;
+	if ((error = am335x_read_property(dev, timing_node,
+	    "hactive", &panel->panel_width)))
+		goto out;
+
+	if ((error = am335x_read_property(dev, timing_node,
+	    "vactive", &panel->panel_height)))
+		goto out;
+
+	if ((error = am335x_read_property(dev, timing_node,
+	    "hfront-porch", &panel->panel_hfp)))
+		goto out;
+
+	if ((error = am335x_read_property(dev, timing_node,
+	    "hback-porch", &panel->panel_hbp)))
+		goto out;
+
+	if ((error = am335x_read_property(dev, timing_node,
+	    "hsync-len", &panel->panel_hsw)))
+		goto out;
+
+	if ((error = am335x_read_property(dev, timing_node,
+	    "vfront-porch", &panel->panel_vfp)))
+		goto out;
+
+	if ((error = am335x_read_property(dev, timing_node,
+	    "vback-porch", &panel->panel_vbp)))
+		goto out;
+
+	if ((error = am335x_read_property(dev, timing_node,
+	    "vsync-len", &panel->panel_vsw)))
+		goto out;
+
+	if ((error = am335x_read_property(dev, timing_node,
+	    "clock-frequency", &panel->panel_pxl_clk)))
+		goto out;
+
+	if ((error = am335x_read_property(dev, timing_node,
+	    "pixelclk-active", &panel->pixelclk_active)))
+		goto out;
+
+	if ((error = am335x_read_property(dev, timing_node,
+	    "hsync-active", &panel->hsync_active)))
+		goto out;
+
+	if ((error = am335x_read_property(dev, timing_node,
+	    "vsync-active", &panel->vsync_active)))
+		goto out;
+
+out:
+	return (error);
+}
+
+static int
+am335x_read_panel_info(device_t dev, phandle_t node, struct panel_info *panel)
+{
+	phandle_t panel_info_node;
+
+	panel_info_node = ofw_bus_find_child(node, "panel-info");
+	if (panel_info_node == 0)
+		return (-1);
+
+	am335x_read_property(dev, panel_info_node,
+	    "ac-bias", &panel->ac_bias);
+
+	am335x_read_property(dev, panel_info_node,
+	    "ac-bias-intrpt", &panel->ac_bias_intrpt);
+
+	am335x_read_property(dev, panel_info_node,
+	    "dma-burst-sz", &panel->dma_burst_sz);
+
+	am335x_read_property(dev, panel_info_node,
+	    "bpp", &panel->bpp);
+
+	am335x_read_property(dev, panel_info_node,
+	    "fdd", &panel->fdd);
+
+	am335x_read_property(dev, panel_info_node,
+	    "sync-edge", &panel->sync_edge);
+
+	am335x_read_property(dev, panel_info_node,
+	    "sync-ctrl", &panel->sync_ctrl);
+
+	return (0);
+}
+
+static void
+am335x_lcd_intr(void *arg)
+{
+	struct am335x_lcd_softc *sc = arg;
+	uint32_t reg; 
+
+	reg = LCD_READ4(sc, LCD_IRQSTATUS);
+	LCD_WRITE4(sc, LCD_IRQSTATUS, reg);
+	/* Read value back to make sure it reached the hardware */
+	reg = LCD_READ4(sc, LCD_IRQSTATUS);
+
+	if (reg & IRQ_SYNC_LOST) {
+		reg = LCD_READ4(sc, LCD_RASTER_CTRL);
+		reg &= ~RASTER_CTRL_LCDEN;
+		LCD_WRITE4(sc, LCD_RASTER_CTRL, reg); 
+
+		reg = LCD_READ4(sc, LCD_RASTER_CTRL);
+		reg |= RASTER_CTRL_LCDEN;
+		LCD_WRITE4(sc, LCD_RASTER_CTRL, reg); 
+		goto done;
+	}
+
+	if (reg & IRQ_PL) {
+		reg = LCD_READ4(sc, LCD_RASTER_CTRL);
+		reg &= ~RASTER_CTRL_LCDEN;
+		LCD_WRITE4(sc, LCD_RASTER_CTRL, reg); 
+
+		reg = LCD_READ4(sc, LCD_RASTER_CTRL);
+		reg |= RASTER_CTRL_LCDEN;
+		LCD_WRITE4(sc, LCD_RASTER_CTRL, reg); 
+		goto done;
+	}
+
+	if (reg & IRQ_EOF0) {
+		LCD_WRITE4(sc, LCD_LCDDMA_FB0_BASE, sc->sc_fb_phys); 
+		LCD_WRITE4(sc, LCD_LCDDMA_FB0_CEILING, sc->sc_fb_phys + sc->sc_fb_size - 1); 
+		reg &= ~IRQ_EOF0;
+	}
+
+	if (reg & IRQ_EOF1) {
+		LCD_WRITE4(sc, LCD_LCDDMA_FB1_BASE, sc->sc_fb_phys); 
+		LCD_WRITE4(sc, LCD_LCDDMA_FB1_CEILING, sc->sc_fb_phys + sc->sc_fb_size - 1); 
+		reg &= ~IRQ_EOF1;
+	}
+
+	if (reg & IRQ_FUF) {
+		/* TODO: Handle FUF */
+	}
+
+	if (reg & IRQ_ACB) {
+		/* TODO: Handle ACB */
+	}
+
+done:
+	LCD_WRITE4(sc, LCD_END_OF_INT_IND, 0);
+	/* Read value back to make sure it reached the hardware */
+	reg = LCD_READ4(sc, LCD_END_OF_INT_IND);
+}
+
+static const struct videomode *
+am335x_lcd_pick_mode(struct edid_info *ei)
+{
+	const struct videomode *videomode;
+	const struct videomode *m;
+	int n;
+
+	/* Get standard VGA as default */
+	videomode = NULL;
+
+	/*
+	 * Pick a mode.
+	 */
+	if (ei->edid_preferred_mode != NULL) {
+		if (am335x_mode_is_valid(ei->edid_preferred_mode))
+			videomode = ei->edid_preferred_mode;
+	}
+
+	if (videomode == NULL) {
+		m = ei->edid_modes;
+
+		sort_modes(ei->edid_modes,
+		    &ei->edid_preferred_mode,
+		    ei->edid_nmodes);
+		for (n = 0; n < ei->edid_nmodes; n++)
+			if (am335x_mode_is_valid(&m[n])) {
+				videomode = &m[n];
+				break;
+			}
+	}
+
+	return videomode;
+}
+
+static int
+am335x_lcd_configure(struct am335x_lcd_softc *sc)
+{
+	int div;
+	uint32_t reg, timing0, timing1, timing2;
+	uint32_t burst_log;
+	size_t dma_size;
+	uint32_t hbp, hfp, hsw;
+	uint32_t vbp, vfp, vsw;
+	uint32_t width, height;
+	unsigned int ref_freq;
+	int err;
+
+	/*
+	 * try to adjust clock to get double of requested frequency
+	 * HDMI/DVI displays are very sensitive to error in frequncy value
+	 */
+	if (ti_prcm_clk_set_source_freq(LCDC_CLK, sc->sc_panel.panel_pxl_clk*2)) {
+		device_printf(sc->sc_dev, "can't set source frequency\n");
+		return (ENXIO);
+	}
+
+	if (ti_prcm_clk_get_source_freq(LCDC_CLK, &ref_freq)) {
+		device_printf(sc->sc_dev, "can't get reference frequency\n");
+		return (ENXIO);
+	}
+
+	/* Panle initialization */
+	dma_size = round_page(sc->sc_panel.panel_width*sc->sc_panel.panel_height*sc->sc_panel.bpp/8);
+
+	/*
+	 * Now allocate framebuffer memory
+	 */
+	err = bus_dma_tag_create(
+	    bus_get_dma_tag(sc->sc_dev),
+	    4, 0,		/* alignment, boundary */
+	    BUS_SPACE_MAXADDR_32BIT,	/* lowaddr */
+	    BUS_SPACE_MAXADDR,		/* highaddr */
+	    NULL, NULL,			/* filter, filterarg */
+	    dma_size, 1,			/* maxsize, nsegments */
+	    dma_size, 0,			/* maxsegsize, flags */
+	    NULL, NULL,			/* lockfunc, lockarg */
+	    &sc->sc_dma_tag);
+	if (err)
+		goto done;
+
+	err = bus_dmamem_alloc(sc->sc_dma_tag, (void **)&sc->sc_fb_base,
+	    BUS_DMA_COHERENT, &sc->sc_dma_map);
+
+	if (err) {
+		device_printf(sc->sc_dev, "cannot allocate framebuffer\n");
+		goto done;
+	}
+
+	err = bus_dmamap_load(sc->sc_dma_tag, sc->sc_dma_map, sc->sc_fb_base,
+	    dma_size, am335x_fb_dmamap_cb, &sc->sc_fb_phys, BUS_DMA_NOWAIT);
+
+	if (err) {
+		device_printf(sc->sc_dev, "cannot load DMA map\n");
+		goto done;
+	}
+
+	/* Make sure it's blank */
+	memset(sc->sc_fb_base, 0x0, dma_size);
+
+	/* Calculate actual FB Size */
+	sc->sc_fb_size = sc->sc_panel.panel_width*sc->sc_panel.panel_height*sc->sc_panel.bpp/8;
+
+	/* Only raster mode is supported */
+	reg = CTRL_RASTER_MODE;
+	div = am335x_lcd_calc_divisor(ref_freq, sc->sc_panel.panel_pxl_clk);
+	reg |= (div << CTRL_DIV_SHIFT);
+	LCD_WRITE4(sc, LCD_CTRL, reg); 
+
+	/* Set timing */
+	timing0 = timing1 = timing2 = 0;
+
+	hbp = sc->sc_panel.panel_hbp - 1;
+	hfp = sc->sc_panel.panel_hfp - 1;
+	hsw = sc->sc_panel.panel_hsw - 1;
+
+	vbp = sc->sc_panel.panel_vbp;
+	vfp = sc->sc_panel.panel_vfp;
+	vsw = sc->sc_panel.panel_vsw - 1;
+
+	height = sc->sc_panel.panel_height - 1;
+	width = sc->sc_panel.panel_width - 1;
+
+	/* Horizontal back porch */
+	timing0 |= (hbp & 0xff) << RASTER_TIMING_0_HBP_SHIFT;
+	timing2 |= ((hbp >> 8) & 3) << RASTER_TIMING_2_HBPHI_SHIFT;
+	/* Horizontal front porch */
+	timing0 |= (hfp & 0xff) << RASTER_TIMING_0_HFP_SHIFT;
+	timing2 |= ((hfp >> 8) & 3) << RASTER_TIMING_2_HFPHI_SHIFT;
+	/* Horizontal sync width */
+	timing0 |= (hsw & 0x3f) << RASTER_TIMING_0_HSW_SHIFT;
+	timing2 |= ((hsw >> 6) & 0xf) << RASTER_TIMING_2_HSWHI_SHIFT;
+
+	/* Vertical back porch, front porch, sync width */
+	timing1 |= (vbp & 0xff) << RASTER_TIMING_1_VBP_SHIFT;
+	timing1 |= (vfp & 0xff) << RASTER_TIMING_1_VFP_SHIFT;
+	timing1 |= (vsw & 0x3f) << RASTER_TIMING_1_VSW_SHIFT;
+
+	/* Pixels per line */
+	timing0 |= ((width >> 10) & 1)
+	    << RASTER_TIMING_0_PPLMSB_SHIFT;
+	timing0 |= ((width >> 4) & 0x3f)
+	    << RASTER_TIMING_0_PPLLSB_SHIFT;
+
+	/* Lines per panel */
+	timing1 |= (height & 0x3ff) 
+	    << RASTER_TIMING_1_LPP_SHIFT;
+	timing2 |= ((height >> 10 ) & 1) 
+	    << RASTER_TIMING_2_LPP_B10_SHIFT;
+
+	/* clock signal settings */
+	if (sc->sc_panel.sync_ctrl)
+		timing2 |= RASTER_TIMING_2_PHSVS;
+	if (sc->sc_panel.sync_edge)
+		timing2 |= RASTER_TIMING_2_PHSVS_RISE;
+	else
+		timing2 |= RASTER_TIMING_2_PHSVS_FALL;
+	if (sc->sc_panel.hsync_active == 0)
+		timing2 |= RASTER_TIMING_2_IHS;
+	if (sc->sc_panel.vsync_active == 0)
+		timing2 |= RASTER_TIMING_2_IVS;
+	if (sc->sc_panel.pixelclk_active == 0)
+		timing2 |= RASTER_TIMING_2_IPC;
+
+	/* AC bias */
+	timing2 |= (sc->sc_panel.ac_bias << RASTER_TIMING_2_ACB_SHIFT);
+	timing2 |= (sc->sc_panel.ac_bias_intrpt << RASTER_TIMING_2_ACBI_SHIFT);
+
+	LCD_WRITE4(sc, LCD_RASTER_TIMING_0, timing0); 
+	LCD_WRITE4(sc, LCD_RASTER_TIMING_1, timing1); 
+	LCD_WRITE4(sc, LCD_RASTER_TIMING_2, timing2); 
+
+	/* DMA settings */
+	reg = LCDDMA_CTRL_FB0_FB1;
+	/* Find power of 2 for current burst size */
+	switch (sc->sc_panel.dma_burst_sz) {
+	case 1:
+		burst_log = 0;
+		break;
+	case 2:
+		burst_log = 1;
+		break;
+	case 4:
+		burst_log = 2;
+		break;
+	case 8:
+		burst_log = 3;
+		break;
+	case 16:
+	default:
+		burst_log = 4;
+		break;
+	}
+	reg |= (burst_log << LCDDMA_CTRL_BURST_SIZE_SHIFT);
+	/* XXX: FIFO TH */
+	reg |= (0 << LCDDMA_CTRL_TH_FIFO_RDY_SHIFT);
+	LCD_WRITE4(sc, LCD_LCDDMA_CTRL, reg); 
+
+	LCD_WRITE4(sc, LCD_LCDDMA_FB0_BASE, sc->sc_fb_phys); 
+	LCD_WRITE4(sc, LCD_LCDDMA_FB0_CEILING, sc->sc_fb_phys + sc->sc_fb_size - 1); 
+	LCD_WRITE4(sc, LCD_LCDDMA_FB1_BASE, sc->sc_fb_phys); 
+	LCD_WRITE4(sc, LCD_LCDDMA_FB1_CEILING, sc->sc_fb_phys + sc->sc_fb_size - 1); 
+
+	/* Enable LCD */
+	reg = RASTER_CTRL_LCDTFT;
+	reg |= (sc->sc_panel.fdd << RASTER_CTRL_REQDLY_SHIFT);
+	reg |= (PALETTE_DATA_ONLY << RASTER_CTRL_PALMODE_SHIFT);
+	if (sc->sc_panel.bpp >= 24)
+		reg |= RASTER_CTRL_TFT24;
+	if (sc->sc_panel.bpp == 32)
+		reg |= RASTER_CTRL_TFT24_UNPACKED;
+	LCD_WRITE4(sc, LCD_RASTER_CTRL, reg); 
+
+	LCD_WRITE4(sc, LCD_CLKC_ENABLE,
+	    CLKC_ENABLE_DMA | CLKC_ENABLE_LDID | CLKC_ENABLE_CORE);
+
+	LCD_WRITE4(sc, LCD_CLKC_RESET, CLKC_RESET_MAIN);
+	DELAY(100);
+	LCD_WRITE4(sc, LCD_CLKC_RESET, 0);
+
+	reg = IRQ_EOF1 | IRQ_EOF0 | IRQ_FUF | IRQ_PL |
+	    IRQ_ACB | IRQ_SYNC_LOST |  IRQ_RASTER_DONE |
+	    IRQ_FRAME_DONE;
+	LCD_WRITE4(sc, LCD_IRQENABLE_SET, reg);
+
+	reg = LCD_READ4(sc, LCD_RASTER_CTRL);
+ 	reg |= RASTER_CTRL_LCDEN;
+	LCD_WRITE4(sc, LCD_RASTER_CTRL, reg); 
+
+	LCD_WRITE4(sc, LCD_SYSCONFIG,
+	    SYSCONFIG_STANDBY_SMART | SYSCONFIG_IDLE_SMART); 
+
+	sc->sc_fb_info.fb_name = device_get_nameunit(sc->sc_dev);
+	sc->sc_fb_info.fb_vbase = (intptr_t)sc->sc_fb_base;
+	sc->sc_fb_info.fb_pbase = sc->sc_fb_phys;
+	sc->sc_fb_info.fb_size = sc->sc_fb_size;
+	sc->sc_fb_info.fb_bpp = sc->sc_fb_info.fb_depth = sc->sc_panel.bpp;
+	sc->sc_fb_info.fb_stride = sc->sc_panel.panel_width*sc->sc_panel.bpp / 8;
+	sc->sc_fb_info.fb_width = sc->sc_panel.panel_width;
+	sc->sc_fb_info.fb_height = sc->sc_panel.panel_height;
+
+#ifdef	DEV_SC
+	err = (sc_attach_unit(device_get_unit(sc->sc_dev),
+	    device_get_flags(sc->sc_dev) | SC_AUTODETECT_KBD));
+
+	if (err) {
+		device_printf(sc->sc_dev, "failed to attach syscons\n");
+		goto fail;
+	}
+
+	am335x_lcd_syscons_setup((vm_offset_t)sc->sc_fb_base, sc->sc_fb_phys, &panel);
+#else /* VT */
+	device_t fbd = device_add_child(sc->sc_dev, "fbd",
+	device_get_unit(sc->sc_dev));
+	if (fbd != NULL) {
+		if (device_probe_and_attach(fbd) != 0)
+			device_printf(sc->sc_dev, "failed to attach fbd device\n");
+	} else
+		device_printf(sc->sc_dev, "failed to add fbd child\n");
+#endif
+
+done:
+	return (err);
+}
+
+static void
+am335x_lcd_hdmi_event(void *arg, device_t hdmi, int event)
+{
+	struct am335x_lcd_softc *sc;
+	const struct videomode *videomode;
+	struct videomode hdmi_mode;
+	device_t hdmi_dev;
+	uint8_t *edid;
+	uint32_t edid_len;
+	struct edid_info ei;
+
+	sc = arg;
+
+	/* Nothing to work with */
+	if (!sc->sc_hdmi_framer) {
+		device_printf(sc->sc_dev, "HDMI event without HDMI framer set\n");
+		return;
+	}
+
+	hdmi_dev = OF_device_from_xref(sc->sc_hdmi_framer);
+	if (!hdmi_dev) {
+		device_printf(sc->sc_dev, "no actual device for \"hdmi\" property\n");
+		return;
+	}
+
+	edid = NULL;
+	edid_len = 0;
+	if (HDMI_GET_EDID(hdmi_dev, &edid, &edid_len) != 0) {
+		device_printf(sc->sc_dev, "failed to get EDID info from HDMI framer\n");
+		return;
+	}
+
+	videomode = NULL;
+
+	if (edid_parse(edid, &ei) == 0) {
+		edid_print(&ei);
+		videomode = am335x_lcd_pick_mode(&ei);
+	} else
+		device_printf(sc->sc_dev, "failed to parse EDID\n");
+
+	/* Use standard VGA as fallback */
+	if (videomode == NULL)
+		videomode = pick_mode_by_ref(640, 480, 60);
+
+	if (videomode == NULL) {
+		device_printf(sc->sc_dev, "failed to find usable videomode");
+		return;
+	}
+
+	device_printf(sc->sc_dev, "detected videomode: %dx%d @ %dKHz\n", videomode->hdisplay,
+		videomode->vdisplay, am335x_mode_vrefresh(videomode));
+
+	sc->sc_panel.panel_width = videomode->hdisplay;
+	sc->sc_panel.panel_height = videomode->vdisplay;
+	sc->sc_panel.panel_hfp = videomode->hsync_start - videomode->hdisplay;
+	sc->sc_panel.panel_hbp = videomode->htotal - videomode->hsync_end;
+	sc->sc_panel.panel_hsw = videomode->hsync_end - videomode->hsync_start;
+	sc->sc_panel.panel_vfp = videomode->vsync_start - videomode->vdisplay;
+	sc->sc_panel.panel_vbp = videomode->vtotal - videomode->vsync_end;
+	sc->sc_panel.panel_vsw = videomode->vsync_end - videomode->vsync_start;
+	sc->sc_panel.pixelclk_active = 1;
+
+	/* logic for HSYNC should be reversed */
+	if (videomode->flags & VID_NHSYNC)
+		sc->sc_panel.hsync_active = 1;
+	else
+		sc->sc_panel.hsync_active = 0;
+
+	if (videomode->flags & VID_NVSYNC)
+		sc->sc_panel.vsync_active = 0;
+	else
+		sc->sc_panel.vsync_active = 1;
+
+	sc->sc_panel.panel_pxl_clk = videomode->dot_clock * 1000;
+
+	am335x_lcd_configure(sc);
+
+	memcpy(&hdmi_mode, videomode, sizeof(hdmi_mode));
+	hdmi_mode.hskew = videomode->hsync_end - videomode->hsync_start;
+	hdmi_mode.flags |= VID_HSKEW;
+
+	HDMI_SET_VIDEOMODE(hdmi_dev, &hdmi_mode);
+}
+
+static int
+am335x_lcd_probe(device_t dev)
+{
+#ifdef DEV_SC
+	int err;
+#endif
+
+	if (!ofw_bus_status_okay(dev))
+		return (ENXIO);
+
+	if (!ofw_bus_is_compatible(dev, "ti,am33xx-tilcdc"))
+		return (ENXIO);
+
+	device_set_desc(dev, "AM335x LCD controller");
+
+#ifdef DEV_SC
+	err = sc_probe_unit(device_get_unit(dev), 
+	    device_get_flags(dev) | SC_AUTODETECT_KBD);
+	if (err != 0)
+		return (err);
+#endif
+
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+am335x_lcd_attach(device_t dev)
+{
+	struct am335x_lcd_softc *sc;
+
+	int err;
+	int rid;
+	struct sysctl_ctx_list *ctx;
+	struct sysctl_oid *tree;
+	phandle_t root, panel_node;
+
+	err = 0;
+	sc = device_get_softc(dev);
+	sc->sc_dev = dev;
+
+	am335x_read_hdmi_property(dev);
+
+	root = OF_finddevice("/");
+	if (root == -1) {
+		device_printf(dev, "failed to get FDT root node\n");
+		return (ENXIO);
+	}
+
+	sc->sc_panel.ac_bias = 255;
+	sc->sc_panel.ac_bias_intrpt = 0;
+	sc->sc_panel.dma_burst_sz = 16;
+	sc->sc_panel.bpp = 16;
+	sc->sc_panel.fdd = 128;
+	sc->sc_panel.sync_edge = 0;
+	sc->sc_panel.sync_ctrl = 1;
+
+	panel_node = fdt_find_compatible(root, "ti,tilcdc,panel", 1);
+	if (panel_node != 0) {
+		device_printf(dev, "using static panel info\n");
+		if (am335x_read_panel_info(dev, panel_node, &sc->sc_panel)) {
+			device_printf(dev, "failed to read panel info\n");
+			return (ENXIO);
+		}
+
+		if (am335x_read_timing(dev, panel_node, &sc->sc_panel)) {
+			device_printf(dev, "failed to read timings\n");
+			return (ENXIO);
+		}
+	}
+
+	ti_prcm_clk_enable(LCDC_CLK);
+
+	rid = 0;
+	sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
+	    RF_ACTIVE);
+	if (!sc->sc_mem_res) {
+		device_printf(dev, "cannot allocate memory window\n");
+		return (ENXIO);
+	}
+
+	rid = 0;
+	sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
+	    RF_ACTIVE);
+	if (!sc->sc_irq_res) {
+		bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
+		device_printf(dev, "cannot allocate interrupt\n");
+		return (ENXIO);
+	}
+
+	if (bus_setup_intr(dev, sc->sc_irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
+			NULL, am335x_lcd_intr, sc,
+			&sc->sc_intr_hl) != 0) {
+		bus_release_resource(dev, SYS_RES_IRQ, rid,
+		    sc->sc_irq_res);
+		bus_release_resource(dev, SYS_RES_MEMORY, rid,
+		    sc->sc_mem_res);
+		device_printf(dev, "Unable to setup the irq handler.\n");
+		return (ENXIO);
+	}
+
+	LCD_LOCK_INIT(sc);
+
+	/* Init backlight interface */
+	ctx = device_get_sysctl_ctx(sc->sc_dev);
+	tree = device_get_sysctl_tree(sc->sc_dev);
+	sc->sc_oid = SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
+	    "backlight", CTLTYPE_INT | CTLFLAG_RW, sc, 0,
+	    am335x_lcd_sysctl_backlight, "I", "LCD backlight");
+	sc->sc_backlight = 0;
+	/* Check if eCAS interface is available at this point */
+	if (am335x_pwm_config_ecap(PWM_UNIT,
+	    PWM_PERIOD, PWM_PERIOD) == 0)
+		sc->sc_backlight = 100;
+
+	if (panel_node != 0)
+		am335x_lcd_configure(sc);
+	else
+		sc->sc_hdmi_evh = EVENTHANDLER_REGISTER(hdmi_event,
+		    am335x_lcd_hdmi_event, sc, EVENTHANDLER_PRI_ANY);
+
+	return (0);
+}
+
+static int
+am335x_lcd_detach(device_t dev)
+{
+	/* Do not let unload driver */
+	return (EBUSY);
+}
+
+static struct fb_info *
+am335x_lcd_fb_getinfo(device_t dev)
+{
+	struct am335x_lcd_softc *sc;
+
+	sc = device_get_softc(dev);
+
+	return (&sc->sc_fb_info);
+}
+
+static device_method_t am335x_lcd_methods[] = {
+	DEVMETHOD(device_probe,		am335x_lcd_probe),
+	DEVMETHOD(device_attach,	am335x_lcd_attach),
+	DEVMETHOD(device_detach,	am335x_lcd_detach),
+
+	/* Framebuffer service methods */
+	DEVMETHOD(fb_getinfo,		am335x_lcd_fb_getinfo),
+
+	DEVMETHOD_END
+};
+
+static driver_t am335x_lcd_driver = {
+	"fb",
+	am335x_lcd_methods,
+	sizeof(struct am335x_lcd_softc),
+};
+
+static devclass_t am335x_lcd_devclass;
+
+DRIVER_MODULE(am335x_lcd, simplebus, am335x_lcd_driver, am335x_lcd_devclass, 0, 0);
+MODULE_VERSION(am335x_lcd, 1);
+MODULE_DEPEND(am335x_lcd, simplebus, 1, 1, 1);
diff --git a/freebsd/sys/arm/ti/am335x/am335x_lcd.h b/freebsd/sys/arm/ti/am335x/am335x_lcd.h
new file mode 100644
index 00000000..f230a930
--- /dev/null
+++ b/freebsd/sys/arm/ti/am335x/am335x_lcd.h
@@ -0,0 +1,60 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo at freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+#ifndef __AM335X_LCD_H__
+#define __AM335X_LCD_H__
+
+struct panel_info {
+	/* Timing part */
+	uint32_t panel_width;
+	uint32_t panel_height;
+	uint32_t panel_hfp;
+	uint32_t panel_hbp;
+	uint32_t panel_hsw;
+	uint32_t panel_vfp;
+	uint32_t panel_vbp;
+	uint32_t panel_vsw;
+	uint32_t hsync_active;
+	uint32_t vsync_active;
+	uint32_t panel_pxl_clk;
+
+	uint32_t ac_bias;
+	uint32_t ac_bias_intrpt;
+	uint32_t dma_burst_sz;
+	uint32_t bpp;
+	uint32_t fdd;
+	uint32_t sync_edge;
+	uint32_t sync_ctrl;
+	uint32_t pixelclk_active;
+};
+
+int am335x_lcd_syscons_setup(vm_offset_t vaddr, vm_paddr_t paddr,
+    struct panel_info *panel);
+
+#endif /* __AM335X_LCD_H__ */
diff --git a/freebsd/sys/arm/ti/am335x/am335x_pwm.h b/freebsd/sys/arm/ti/am335x/am335x_pwm.h
new file mode 100644
index 00000000..956913dc
--- /dev/null
+++ b/freebsd/sys/arm/ti/am335x/am335x_pwm.h
@@ -0,0 +1,35 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo at freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+#ifndef __AM335X_PWM_H__
+#define __AM335X_PWM_H__
+
+int am335x_pwm_config_ecap(int unit, int period, int duty);
+
+#endif /* __AM335X_PWM_H__ */
diff --git a/freebsd/sys/arm/ti/am335x/am335x_pwmss.c b/freebsd/sys/arm/ti/am335x/am335x_pwmss.c
new file mode 100644
index 00000000..f9249989
--- /dev/null
+++ b/freebsd/sys/arm/ti/am335x/am335x_pwmss.c
@@ -0,0 +1,165 @@
+#include <machine/rtems-bsd-kernel-space.h>
+
+/*-
+ * Copyright (c) 2013 Oleksandr Tymoshenko <gonzo at freebsd.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/systm.h>
+#include <sys/bus.h>
+#include <sys/kernel.h>
+#include <sys/limits.h>
+#include <sys/lock.h>
+#include <sys/module.h>
+#include <sys/mutex.h>
+#include <rtems/bsd/sys/resource.h>
+#include <sys/rman.h>
+#include <sys/sysctl.h>
+
+#include <machine/bus.h>
+
+#include <dev/fdt/simplebus.h>
+#include <dev/ofw/openfirm.h>
+#include <dev/ofw/ofw_bus.h>
+#include <dev/ofw/ofw_bus_subr.h>
+
+#include <arm/ti/ti_prcm.h>
+#include <arm/ti/ti_hwmods.h>
+#include <arm/ti/ti_scm.h>
+
+#include "am335x_pwm.h"
+#include "am335x_scm.h"
+
+#define	PWMSS_IDVER		0x00
+#define	PWMSS_SYSCONFIG		0x04
+#define	PWMSS_CLKCONFIG		0x08
+#define		CLKCONFIG_EPWMCLK_EN	(1 << 8)
+#define	PWMSS_CLKSTATUS		0x0C
+
+static device_probe_t am335x_pwmss_probe;
+static device_attach_t am335x_pwmss_attach;
+static device_detach_t am335x_pwmss_detach;
+
+struct am335x_pwmss_softc {
+	struct simplebus_softc	sc_simplebus;
+	device_t		sc_dev;
+	clk_ident_t		sc_clk;
+};
+
+static device_method_t am335x_pwmss_methods[] = {
+	DEVMETHOD(device_probe,		am335x_pwmss_probe),
+	DEVMETHOD(device_attach,	am335x_pwmss_attach),
+	DEVMETHOD(device_detach,	am335x_pwmss_detach),
+
+	DEVMETHOD_END
+};
+
+static int
+am335x_pwmss_probe(device_t dev)
+{
+
+	if (!ofw_bus_status_okay(dev))
+		return (ENXIO);
+
+	if (!ofw_bus_is_compatible(dev, "ti,am33xx-pwmss"))
+		return (ENXIO);
+
+	device_set_desc(dev, "AM335x PWM");
+
+	return (BUS_PROBE_DEFAULT);
+}
+
+static int
+am335x_pwmss_attach(device_t dev)
+{
+	struct am335x_pwmss_softc *sc;
+	uint32_t reg, id;
+	phandle_t node;
+
+	sc = device_get_softc(dev);
+	sc->sc_dev = dev;
+
+	sc->sc_clk = ti_hwmods_get_clock(dev);
+	if (sc->sc_clk == INVALID_CLK_IDENT) {
+		device_printf(dev, "failed to get device id based on ti,hwmods\n");
+		return (EINVAL);
+	}
+
+	ti_prcm_clk_enable(sc->sc_clk);
+	ti_scm_reg_read_4(SCM_PWMSS_CTRL, &reg);
+	switch (sc->sc_clk) {
+		case PWMSS0_CLK:
+			id = 0;
+			break;
+		case PWMSS1_CLK:
+			id = 1;
+			break;
+
+		case PWMSS2_CLK:
+			id = 2;
+			break;
+		default:
+			device_printf(dev, "unknown pwmss clock id: %d\n", sc->sc_clk);
+			return (EINVAL);
+	}
+	reg |= (1 << id);
+	ti_scm_reg_write_4(SCM_PWMSS_CTRL, reg);
+
+	node = ofw_bus_get_node(dev);
+
+	if (node == -1)
+		return (ENXIO);
+
+	simplebus_init(dev, node);
+
+	/*
+	 * Allow devices to identify.
+	 */
+	bus_generic_probe(dev);
+
+	/*
+	 * Now walk the OFW tree and attach top-level devices.
+	 */
+	for (node = OF_child(node); node > 0; node = OF_peer(node))
+		simplebus_add_device(dev, node, 0, NULL, -1, NULL);
+
+	return (bus_generic_attach(dev));
+}
+
+static int
+am335x_pwmss_detach(device_t dev)
+{
+
+	return (0);
+}
+
+DEFINE_CLASS_1(am335x_pwmss, am335x_pwmss_driver, am335x_pwmss_methods,
+    sizeof(struct am335x_pwmss_softc), simplebus_driver);
+static devclass_t am335x_pwmss_devclass;
+DRIVER_MODULE(am335x_pwmss, simplebus, am335x_pwmss_driver, am335x_pwmss_devclass, 0, 0);
+MODULE_VERSION(am335x_pwmss, 1);
-- 
2.20.1




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