[PATCH 5/5] DRM: Add i.MX IPUv3 crtc support

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This adds a i.MX51/53 IPU (Image Processing Unit) KMS driver. The
driver has been tested on the i.MX51 babbage board and the i.MX53
LOCO board in different clone mode and dual head setups.

Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
---
 drivers/gpu/drm/imx/Kconfig          |    6 +
 drivers/gpu/drm/imx/Makefile         |    1 +
 drivers/gpu/drm/imx/imx-ipuv3-crtc.c |  579 ++++++++++++++++++++++++++++++++++
 3 files changed, 586 insertions(+)
 create mode 100644 drivers/gpu/drm/imx/imx-ipuv3-crtc.c

diff --git a/drivers/gpu/drm/imx/Kconfig b/drivers/gpu/drm/imx/Kconfig
index e735643..cd89c23 100644
--- a/drivers/gpu/drm/imx/Kconfig
+++ b/drivers/gpu/drm/imx/Kconfig
@@ -32,3 +32,9 @@ config DRM_IMX_IPUV3_CORE
 	  Choose this if you have a i.MX5/6 system and want
 	  to use the IPU. This option only enables IPU base
 	  support.
+
+config DRM_IMX_IPUV3
+	tristate "DRM Support for i.MX IPUv3"
+	depends on DRM_IMX
+	help
+	  Choose this if you have a i.MX5 or i.MX6 processor.
diff --git a/drivers/gpu/drm/imx/Makefile b/drivers/gpu/drm/imx/Makefile
index 72a7e26..8006081 100644
--- a/drivers/gpu/drm/imx/Makefile
+++ b/drivers/gpu/drm/imx/Makefile
@@ -7,3 +7,4 @@ obj-$(CONFIG_DRM_IMX_PARALLEL_DISPLAY) += imx-parallel-display.o
 obj-$(CONFIG_DRM_IMX_LCDC) += imx-lcdc-crtc.o
 obj-$(CONFIG_DRM_IMX_FB_HELPER) += imx-fbdev.o
 obj-$(CONFIG_DRM_IMX_IPUV3_CORE) += ipu-v3/
+obj-$(CONFIG_DRM_IMX_IPUV3)	+= imx-ipuv3-crtc.o
diff --git a/drivers/gpu/drm/imx/imx-ipuv3-crtc.c b/drivers/gpu/drm/imx/imx-ipuv3-crtc.c
new file mode 100644
index 0000000..5d7730d
--- /dev/null
+++ b/drivers/gpu/drm/imx/imx-ipuv3-crtc.c
@@ -0,0 +1,579 @@
+/*
+ * i.MX IPUv3 Graphics driver
+ *
+ * Copyright (C) 2011 Sascha Hauer, Pengutronix
+ *
+ * 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., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02110-1301, USA.
+ */
+#include <linux/module.h>
+#include <linux/export.h>
+#include <linux/device.h>
+#include <linux/platform_device.h>
+#include <drm/drmP.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <linux/fb.h>
+#include <linux/clk.h>
+#include <drm/imx-ipu-v3.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+
+#include "imx-drm.h"
+
+#define DRIVER_DESC		"i.MX IPUv3 Graphics"
+
+struct ipu_framebuffer {
+	struct drm_framebuffer	base;
+	void			*virt;
+	dma_addr_t		phys;
+	size_t			len;
+};
+
+struct ipu_crtc {
+	struct drm_fb_helper	fb_helper;
+	struct ipu_framebuffer	ifb;
+	int			num_crtcs;
+	struct device		*dev;
+	struct drm_crtc		base;
+	struct imx_drm_crtc	*imx_crtc;
+	struct ipuv3_channel	*ipu_ch;
+	struct ipu_dc		*dc;
+	struct ipu_dp		*dp;
+	struct dmfc_channel	*dmfc;
+	struct ipu_di		*di;
+	int			enabled;
+	struct ipu_priv		*ipu_priv;
+	struct drm_pending_vblank_event *page_flip_event;
+	struct drm_framebuffer	*newfb;
+	int			irq;
+	u32			interface_pix_fmt;
+	unsigned long		di_clkflags;
+};
+
+#define to_ipu_crtc(x) container_of(x, struct ipu_crtc, base)
+
+static int calc_vref(struct drm_display_mode *mode)
+{
+	unsigned long htotal, vtotal;
+
+	htotal = mode->htotal;
+	vtotal = mode->vtotal;
+
+	if (!htotal || !vtotal)
+		return 60;
+
+	return mode->clock * 1000 / vtotal / htotal;
+}
+
+static int calc_bandwidth(struct drm_display_mode *mode, unsigned int vref)
+{
+	return mode->hdisplay * mode->vdisplay * vref;
+}
+
+static void ipu_fb_enable(struct ipu_crtc *ipu_crtc)
+{
+	if (ipu_crtc->enabled)
+		return;
+
+	ipu_di_enable(ipu_crtc->di);
+	ipu_dmfc_enable_channel(ipu_crtc->dmfc);
+	ipu_idmac_enable_channel(ipu_crtc->ipu_ch);
+	ipu_dc_enable_channel(ipu_crtc->dc);
+	if (ipu_crtc->dp)
+		ipu_dp_enable_channel(ipu_crtc->dp);
+
+	ipu_crtc->enabled = 1;
+}
+
+static void ipu_fb_disable(struct ipu_crtc *ipu_crtc)
+{
+	if (!ipu_crtc->enabled)
+		return;
+
+	if (ipu_crtc->dp)
+		ipu_dp_disable_channel(ipu_crtc->dp);
+	ipu_dc_disable_channel(ipu_crtc->dc);
+	ipu_idmac_disable_channel(ipu_crtc->ipu_ch);
+	ipu_dmfc_disable_channel(ipu_crtc->dmfc);
+	ipu_di_disable(ipu_crtc->di);
+
+	ipu_crtc->enabled = 0;
+}
+
+static void ipu_crtc_dpms(struct drm_crtc *crtc, int mode)
+{
+	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+
+	dev_info(ipu_crtc->dev, "%s mode: %d\n", __func__, mode);
+
+	switch (mode) {
+	case DRM_MODE_DPMS_ON:
+		ipu_fb_enable(ipu_crtc);
+		break;
+	case DRM_MODE_DPMS_STANDBY:
+	case DRM_MODE_DPMS_SUSPEND:
+	case DRM_MODE_DPMS_OFF:
+		ipu_fb_disable(ipu_crtc);
+		break;
+	}
+}
+
+static int ipu_page_flip(struct drm_crtc *crtc,
+		struct drm_framebuffer *fb,
+		struct drm_pending_vblank_event *event)
+{
+	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+	int ret;
+
+	if (ipu_crtc->newfb)
+		return -EBUSY;
+
+	ret = imx_drm_crtc_vblank_get(ipu_crtc->imx_crtc);
+	if (ret) {
+		dev_dbg(ipu_crtc->dev, "failed to acquire vblank counter\n");
+		list_del(&event->base.link);
+
+		return ret;
+	}
+
+	ipu_crtc->newfb = fb;
+	ipu_crtc->page_flip_event = event;
+
+	return 0;
+}
+
+static const struct drm_crtc_funcs ipu_crtc_funcs = {
+	.set_config = drm_crtc_helper_set_config,
+	.destroy = drm_crtc_cleanup,
+	.page_flip = ipu_page_flip,
+};
+
+static int ipu_drm_set_base(struct drm_crtc *crtc, int x, int y)
+{
+	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+	struct drm_gem_cma_object *cma_obj;
+	struct drm_framebuffer *fb = crtc->fb;
+	unsigned long phys;
+
+	cma_obj = drm_fb_cma_get_gem_obj(fb, 0);
+	if (!cma_obj) {
+		DRM_LOG_KMS("entry is null.\n");
+		return -EFAULT;
+	}
+
+	phys = cma_obj->paddr;
+	phys += x * (fb->bits_per_pixel >> 3);
+	phys += y * fb->pitches[0];
+
+	dev_dbg(ipu_crtc->dev, "%s: phys: 0x%lx\n", __func__, phys);
+	dev_dbg(ipu_crtc->dev, "%s: xy: %dx%d\n", __func__, x, y);
+
+	ipu_cpmem_set_stride(ipu_get_cpmem(ipu_crtc->ipu_ch), fb->pitches[0]);
+	ipu_cpmem_set_buffer(ipu_get_cpmem(ipu_crtc->ipu_ch),
+			  0, phys);
+
+	return 0;
+}
+
+static int ipu_crtc_mode_set(struct drm_crtc *crtc,
+			       struct drm_display_mode *orig_mode,
+			       struct drm_display_mode *mode,
+			       int x, int y,
+			       struct drm_framebuffer *old_fb)
+{
+	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+	struct drm_framebuffer *fb = ipu_crtc->base.fb;
+	int ret;
+	struct ipu_di_signal_cfg sig_cfg = {};
+	u32 out_pixel_fmt;
+	struct ipu_ch_param __iomem *cpmem = ipu_get_cpmem(ipu_crtc->ipu_ch);
+	int bpp;
+	u32 v4l2_fmt;
+
+	dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
+			mode->hdisplay);
+	dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
+			mode->vdisplay);
+
+	ipu_ch_param_zero(cpmem);
+
+	switch (fb->pixel_format) {
+	case DRM_FORMAT_XRGB8888:
+	case DRM_FORMAT_ARGB8888:
+		v4l2_fmt = V4L2_PIX_FMT_RGB32;
+		bpp = 32;
+		break;
+	case DRM_FORMAT_RGB565:
+		v4l2_fmt = V4L2_PIX_FMT_RGB565;
+		bpp = 16;
+		break;
+	case DRM_FORMAT_RGB888:
+		v4l2_fmt = V4L2_PIX_FMT_RGB24;
+		bpp = 24;
+		break;
+	default:
+		dev_err(ipu_crtc->dev, "unsupported pixel format 0x%08x\n",
+				fb->pixel_format);
+		return -EINVAL;
+	}
+
+	out_pixel_fmt = ipu_crtc->interface_pix_fmt;
+
+	if (mode->flags & DRM_MODE_FLAG_INTERLACE)
+		sig_cfg.interlaced = 1;
+	if (mode->flags & DRM_MODE_FLAG_PHSYNC)
+		sig_cfg.Hsync_pol = 1;
+	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
+		sig_cfg.Vsync_pol = 1;
+
+	sig_cfg.enable_pol = 1;
+	sig_cfg.clk_pol = 0;
+	sig_cfg.width = mode->hdisplay;
+	sig_cfg.height = mode->vdisplay;
+	sig_cfg.pixel_fmt = out_pixel_fmt;
+	sig_cfg.h_start_width = mode->htotal - mode->hsync_end;
+	sig_cfg.h_sync_width = mode->hsync_end - mode->hsync_start;
+	sig_cfg.h_end_width = mode->hsync_start - mode->hdisplay;
+
+	sig_cfg.v_start_width = mode->vtotal - mode->vsync_end;
+	sig_cfg.v_sync_width = mode->vsync_end - mode->vsync_start;
+	sig_cfg.v_end_width = mode->vsync_start - mode->vdisplay;
+	sig_cfg.pixelclock = mode->clock * 1000;
+	sig_cfg.clkflags = ipu_crtc->di_clkflags;
+
+	sig_cfg.v_to_h_sync = 0;
+
+	if (ipu_crtc->dp) {
+		ret = ipu_dp_setup_channel(ipu_crtc->dp, IPUV3_COLORSPACE_RGB,
+				IPUV3_COLORSPACE_RGB);
+		if (ret) {
+			dev_err(ipu_crtc->dev,
+				"initializing display processor failed with %d\n",
+				ret);
+			return ret;
+		}
+		ipu_dp_set_global_alpha(ipu_crtc->dp, 1, 0, 1);
+	}
+
+	ret = ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di, sig_cfg.interlaced,
+			out_pixel_fmt, mode->hdisplay);
+	if (ret) {
+		dev_err(ipu_crtc->dev,
+				"initializing display controller failed with %d\n",
+				ret);
+		return ret;
+	}
+
+	ret = ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
+	if (ret) {
+		dev_err(ipu_crtc->dev,
+				"initializing panel failed with %d\n", ret);
+		return ret;
+	}
+
+	ipu_cpmem_set_resolution(cpmem, mode->hdisplay, mode->vdisplay);
+	ipu_cpmem_set_fmt(cpmem, v4l2_fmt);
+	ipu_cpmem_set_high_priority(ipu_crtc->ipu_ch);
+
+	ret = ipu_dmfc_init_channel(ipu_crtc->dmfc, mode->hdisplay);
+	if (ret) {
+		dev_err(ipu_crtc->dev,
+				"initializing dmfc channel failed with %d\n",
+				ret);
+		return ret;
+	}
+
+	ret = ipu_dmfc_alloc_bandwidth(ipu_crtc->dmfc,
+			calc_bandwidth(mode, calc_vref(mode)), 64);
+	if (ret) {
+		dev_err(ipu_crtc->dev,
+				"allocating dmfc bandwidth failed with %d\n",
+				ret);
+		return ret;
+	}
+
+	ipu_drm_set_base(crtc, x, y);
+
+	return 0;
+}
+
+static void ipu_crtc_handle_pageflip(struct ipu_crtc *ipu_crtc)
+{
+	struct drm_pending_vblank_event *e;
+	struct timeval now;
+	unsigned long flags;
+	struct drm_device *drm = ipu_crtc->base.dev;
+
+	spin_lock_irqsave(&drm->event_lock, flags);
+
+	e = ipu_crtc->page_flip_event;
+	if (!e) {
+		spin_unlock_irqrestore(&drm->event_lock, flags);
+		return;
+	}
+
+	do_gettimeofday(&now);
+	e->event.sequence = 0;
+	e->event.tv_sec = now.tv_sec;
+	e->event.tv_usec = now.tv_usec;
+	ipu_crtc->page_flip_event = NULL;
+
+	imx_drm_crtc_vblank_put(ipu_crtc->imx_crtc);
+
+	list_add_tail(&e->base.link, &e->base.file_priv->event_list);
+
+	wake_up_interruptible(&e->base.file_priv->event_wait);
+
+	spin_unlock_irqrestore(&drm->event_lock, flags);
+}
+
+static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
+{
+	struct ipu_crtc *ipu_crtc = dev_id;
+
+	imx_drm_handle_vblank(ipu_crtc->imx_crtc);
+
+	if (ipu_crtc->newfb) {
+		ipu_crtc->base.fb = ipu_crtc->newfb;
+		ipu_crtc->newfb = NULL;
+		ipu_drm_set_base(&ipu_crtc->base, 0, 0);
+		ipu_crtc_handle_pageflip(ipu_crtc);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
+				  struct drm_display_mode *mode,
+				  struct drm_display_mode *adjusted_mode)
+{
+	return true;
+}
+
+static void ipu_crtc_prepare(struct drm_crtc *crtc)
+{
+	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+
+	ipu_fb_disable(ipu_crtc);
+}
+
+static void ipu_crtc_commit(struct drm_crtc *crtc)
+{
+	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+
+	ipu_fb_enable(ipu_crtc);
+}
+
+static void ipu_crtc_load_lut(struct drm_crtc *crtc)
+{
+}
+
+static struct drm_crtc_helper_funcs ipu_helper_funcs = {
+	.dpms = ipu_crtc_dpms,
+	.mode_fixup = ipu_crtc_mode_fixup,
+	.mode_set = ipu_crtc_mode_set,
+	.prepare = ipu_crtc_prepare,
+	.commit = ipu_crtc_commit,
+	.load_lut = ipu_crtc_load_lut,
+};
+
+static int ipu_enable_vblank(struct drm_crtc *crtc)
+{
+	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+
+	enable_irq(ipu_crtc->irq);
+
+	return 0;
+}
+
+static void ipu_disable_vblank(struct drm_crtc *crtc)
+{
+	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+
+	disable_irq(ipu_crtc->irq);
+}
+
+static int ipu_set_interface_pix_fmt(struct drm_crtc *crtc, u32 encoder_type,
+		u32 pixfmt)
+{
+	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
+
+	ipu_crtc->interface_pix_fmt = pixfmt;
+
+	switch (encoder_type) {
+	case DRM_MODE_ENCODER_LVDS:
+		ipu_crtc->di_clkflags = IPU_DI_CLKMODE_SYNC |
+			IPU_DI_CLKMODE_EXT;
+		break;
+	case DRM_MODE_ENCODER_NONE:
+		ipu_crtc->di_clkflags = 0;
+		break;
+	}
+
+	return 0;
+}
+
+static const struct imx_drm_crtc_helper_funcs ipu_crtc_helper_funcs = {
+	.enable_vblank = ipu_enable_vblank,
+	.disable_vblank = ipu_disable_vblank,
+	.set_interface_pix_fmt = ipu_set_interface_pix_fmt,
+	.crtc_funcs = &ipu_crtc_funcs,
+	.crtc_helper_funcs = &ipu_helper_funcs,
+};
+
+static void ipu_put_resources(struct ipu_crtc *ipu_crtc)
+{
+	if (!IS_ERR_OR_NULL(ipu_crtc->ipu_ch))
+		ipu_idmac_put(ipu_crtc->ipu_ch);
+	if (!IS_ERR_OR_NULL(ipu_crtc->dmfc))
+		ipu_dmfc_put(ipu_crtc->dmfc);
+	if (!IS_ERR_OR_NULL(ipu_crtc->dp))
+		ipu_dp_put(ipu_crtc->dp);
+	if (!IS_ERR_OR_NULL(ipu_crtc->di))
+		ipu_di_put(ipu_crtc->di);
+}
+
+static int ipu_get_resources(struct ipu_crtc *ipu_crtc,
+		struct ipu_client_platformdata *pdata)
+{
+	struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
+	int ret;
+
+	ipu_crtc->ipu_ch = ipu_idmac_get(ipu, pdata->dma[0]);
+	if (IS_ERR_OR_NULL(ipu_crtc->ipu_ch)) {
+		ret = PTR_ERR(ipu_crtc->ipu_ch);
+		goto err_out;
+	}
+
+	ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
+	if (IS_ERR(ipu_crtc->dc)) {
+		ret = PTR_ERR(ipu_crtc->dc);
+		goto err_out;
+	}
+
+	ipu_crtc->dmfc = ipu_dmfc_get(ipu, pdata->dma[0]);
+	if (IS_ERR(ipu_crtc->dmfc)) {
+		ret = PTR_ERR(ipu_crtc->dmfc);
+		goto err_out;
+	}
+
+	if (pdata->dp >= 0) {
+		ipu_crtc->dp = ipu_dp_get(ipu, pdata->dp);
+		if (IS_ERR(ipu_crtc->dp)) {
+			ret = PTR_ERR(ipu_crtc->ipu_ch);
+			goto err_out;
+		}
+	}
+
+	ipu_crtc->di = ipu_di_get(ipu, pdata->di);
+	if (IS_ERR(ipu_crtc->di)) {
+		ret = PTR_ERR(ipu_crtc->di);
+		goto err_out;
+	}
+
+	ipu_crtc->irq = ipu_idmac_channel_irq(ipu, ipu_crtc->ipu_ch,
+			IPU_IRQ_EOF);
+	ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
+			"imx_drm", ipu_crtc);
+	if (ret < 0) {
+		dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
+		goto err_out;
+	}
+
+	disable_irq(ipu_crtc->irq);
+
+	return 0;
+err_out:
+	ipu_put_resources(ipu_crtc);
+
+	return ret;
+}
+
+static int ipu_crtc_init(struct ipu_crtc *ipu_crtc,
+		struct ipu_client_platformdata *pdata)
+{
+	int ret;
+
+	ret = ipu_get_resources(ipu_crtc, pdata);
+	if (ret) {
+		dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
+				ret);
+		return ret;
+	}
+
+	ret = imx_drm_add_crtc(&ipu_crtc->base,
+			&ipu_crtc->imx_crtc,
+			&ipu_crtc_helper_funcs, THIS_MODULE,
+			ipu_crtc->dev->parent->of_node, pdata->di);
+	if (ret) {
+		dev_err(ipu_crtc->dev, "adding crtc failed with %d.\n", ret);
+		goto err_put_resources;
+	}
+
+	return 0;
+
+err_put_resources:
+	ipu_put_resources(ipu_crtc);
+
+	return ret;
+}
+
+static int __devinit ipu_drm_probe(struct platform_device *pdev)
+{
+	struct ipu_client_platformdata *pdata = pdev->dev.platform_data;
+	struct ipu_crtc *ipu_crtc;
+	int ret;
+
+	if (!pdata)
+		return -EINVAL;
+
+	pdev->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+
+	ipu_crtc = devm_kzalloc(&pdev->dev, sizeof(*ipu_crtc), GFP_KERNEL);
+	if (!ipu_crtc)
+		return -ENOMEM;
+
+	ipu_crtc->dev = &pdev->dev;
+
+	ret = ipu_crtc_init(ipu_crtc, pdata);
+
+	platform_set_drvdata(pdev, ipu_crtc);
+
+	return 0;
+}
+
+static int __devexit ipu_drm_remove(struct platform_device *pdev)
+{
+	struct ipu_crtc *ipu_crtc = platform_get_drvdata(pdev);
+
+	imx_drm_remove_crtc(ipu_crtc->imx_crtc);
+
+	ipu_put_resources(ipu_crtc);
+
+	return 0;
+}
+
+static struct platform_driver ipu_drm_driver = {
+	.driver = {
+		.name = "imx-ipuv3-crtc",
+	},
+	.probe = ipu_drm_probe,
+	.remove = __devexit_p(ipu_drm_remove),
+};
+module_platform_driver(ipu_drm_driver);
+
+MODULE_AUTHOR("Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>");
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL");
-- 
1.7.10

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