gpu: ipu-v3: add driver for Prefetch Resolve Gasket

This adds support for the i.MX6 QUadPlus PRG unit. It glues together the
IPU and the PRE units.
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
---
v4: add missing ipu_soc->prg_priv

drivers/gpu/ipu-v3/Makefile

@@ -2,4 +2,4 @@ obj-$(CONFIG_IMX_IPUV3_CORE) += imx-ipu-v3.o
 
 imx-ipu-v3-objs := ipu-common.o ipu-cpmem.o ipu-csi.o ipu-dc.o ipu-di.o \
 		ipu-dp.o ipu-dmfc.o ipu-ic.o ipu-image-convert.o \
-		ipu-pre.o ipu-smfc.o ipu-vdi.o
+		ipu-pre.o ipu-prg.o ipu-smfc.o ipu-vdi.o

drivers/gpu/ipu-v3/ipu-common.c

@@ -1530,6 +1530,7 @@ static struct platform_driver imx_ipu_driver = {
 
 static struct platform_driver * const drivers[] = {
 	&ipu_pre_drv,
+	&ipu_prg_drv,
 	&imx_ipu_driver,
 };
 

drivers/gpu/ipu-v3/ipu-prv.h

@@ -174,6 +174,7 @@ struct ipu_vdi;
 struct ipu_image_convert_priv;
 struct ipu_smfc_priv;
 struct ipu_pre;
+struct ipu_prg;
 
 struct ipu_devtype;
 
@@ -208,6 +209,7 @@ struct ipu_soc {
 	struct ipu_vdi          *vdi_priv;
 	struct ipu_image_convert_priv *image_convert_priv;
 	struct ipu_smfc_priv	*smfc_priv;
+	struct ipu_prg		*prg_priv;
 };
 
 static inline u32 ipu_idmac_read(struct ipu_soc *ipu, unsigned offset)
@@ -276,6 +278,10 @@ void ipu_pre_configure(struct ipu_pre *pre, unsigned int width,
 		       unsigned int stride, u32 format, unsigned int bufaddr);
 void ipu_pre_update(struct ipu_pre *pre, unsigned int bufaddr);
 
+struct ipu_prg *ipu_prg_lookup_by_phandle(struct device *dev, const char *name,
+					  int ipu_id);
+
 extern struct platform_driver ipu_pre_drv;
+extern struct platform_driver ipu_prg_drv;
 
 #endif				/* __IPU_PRV_H__ */

include/video/imx-ipu-v3.h

@@ -330,6 +330,21 @@ int ipu_dp_set_window_pos(struct ipu_dp *, u16 x_pos, u16 y_pos);
 int ipu_dp_set_global_alpha(struct ipu_dp *dp, bool enable, u8 alpha,
 		bool bg_chan);
 
+/*
+ * IPU Prefetch Resolve Gasket (prg) functions
+ */
+int ipu_prg_max_active_channels(void);
+bool ipu_prg_present(struct ipu_soc *ipu);
+bool ipu_prg_format_supported(struct ipu_soc *ipu, uint32_t format,
+			      uint64_t modifier);
+int ipu_prg_enable(struct ipu_soc *ipu);
+void ipu_prg_disable(struct ipu_soc *ipu);
+void ipu_prg_channel_disable(struct ipuv3_channel *ipu_chan);
+int ipu_prg_channel_configure(struct ipuv3_channel *ipu_chan,
+			      unsigned int axi_id,  unsigned int width,
+			      unsigned int height, unsigned int stride,
+			      u32 format, unsigned long *eba);
+
 /*
  * IPU CMOS Sensor Interface (csi) functions
  */