Merge branch 'topic/dw' into for-linus

Documentation/devicetree/bindings/dma/snps-dma.txt

@@ -27,6 +27,10 @@ Optional properties:
   general purpose DMA channel allocator. False if not passed.
 - multi-block: Multi block transfers supported by hardware. Array property with
   one cell per channel. 0: not supported, 1 (default): supported.
+- snps,dma-protection-control: AHB HPROT[3:1] protection setting.
+  The default value is 0 (for non-cacheable, non-buffered,
+  unprivileged data access).
+  Refer to include/dt-bindings/dma/dw-dmac.h for possible values.
 
 Example:
 

MAINTAINERS

@@ -14363,9 +14363,11 @@ SYNOPSYS DESIGNWARE DMAC DRIVER
 M:	Viresh Kumar <vireshk@kernel.org>
 R:	Andy Shevchenko <andriy.shevchenko@linux.intel.com>
 S:	Maintained
+F:	Documentation/devicetree/bindings/dma/snps-dma.txt
+F:	drivers/dma/dw/
+F:	include/dt-bindings/dma/dw-dmac.h
 F:	include/linux/dma/dw.h
 F:	include/linux/platform_data/dma-dw.h
-F:	drivers/dma/dw/
 
 SYNOPSYS DESIGNWARE ENTERPRISE ETHERNET DRIVER
 M:	Jose Abreu <Jose.Abreu@synopsys.com>

drivers/dma/dw/core.c

@@ -160,12 +160,14 @@ static void dwc_initialize_chan_idma32(struct dw_dma_chan *dwc)
 
 static void dwc_initialize_chan_dw(struct dw_dma_chan *dwc)
 {
+	struct dw_dma *dw = to_dw_dma(dwc->chan.device);
 	u32 cfghi = DWC_CFGH_FIFO_MODE;
 	u32 cfglo = DWC_CFGL_CH_PRIOR(dwc->priority);
 	bool hs_polarity = dwc->dws.hs_polarity;
 
 	cfghi |= DWC_CFGH_DST_PER(dwc->dws.dst_id);
 	cfghi |= DWC_CFGH_SRC_PER(dwc->dws.src_id);
+	cfghi |= DWC_CFGH_PROTCTL(dw->pdata->protctl);
 
 	/* Set polarity of handshake interface */
 	cfglo |= hs_polarity ? DWC_CFGL_HS_DST_POL | DWC_CFGL_HS_SRC_POL : 0;

drivers/dma/dw/platform.c

@@ -162,6 +162,12 @@ dw_dma_parse_dt(struct platform_device *pdev)
 			pdata->multi_block[tmp] = 1;
 	}
 
+	if (!of_property_read_u32(np, "snps,dma-protection-control", &tmp)) {
+		if (tmp > CHAN_PROTCTL_MASK)
+			return NULL;
+		pdata->protctl = tmp;
+	}
+
 	return pdata;
 }
 #else

drivers/dma/dw/regs.h

@@ -200,6 +200,10 @@ enum dw_dma_msize {
 #define DWC_CFGH_FCMODE		(1 << 0)
 #define DWC_CFGH_FIFO_MODE	(1 << 1)
 #define DWC_CFGH_PROTCTL(x)	((x) << 2)
+#define DWC_CFGH_PROTCTL_DATA	(0 << 2)	/* data access - always set */
+#define DWC_CFGH_PROTCTL_PRIV	(1 << 2)	/* privileged -> AHB HPROT[1] */
+#define DWC_CFGH_PROTCTL_BUFFER	(2 << 2)	/* bufferable -> AHB HPROT[2] */
+#define DWC_CFGH_PROTCTL_CACHE	(4 << 2)	/* cacheable  -> AHB HPROT[3] */
 #define DWC_CFGH_DS_UPD_EN	(1 << 5)
 #define DWC_CFGH_SS_UPD_EN	(1 << 6)
 #define DWC_CFGH_SRC_PER(x)	((x) << 7)

include/dt-bindings/dma/dw-dmac.h

+/* SPDX-License-Identifier: (GPL-2.0 OR MIT) */
+
+#ifndef __DT_BINDINGS_DMA_DW_DMAC_H__
+#define __DT_BINDINGS_DMA_DW_DMAC_H__
+
+/*
+ * Protection Control bits provide protection against illegal transactions.
+ * The protection bits[0:2] are one-to-one mapped to AHB HPROT[3:1] signals.
+ */
+#define DW_DMAC_HPROT1_PRIVILEGED_MODE	(1 << 0)	/* Privileged Mode */
+#define DW_DMAC_HPROT2_BUFFERABLE	(1 << 1)	/* DMA is bufferable */
+#define DW_DMAC_HPROT3_CACHEABLE	(1 << 2)	/* DMA is cacheable */
+
+#endif /* __DT_BINDINGS_DMA_DW_DMAC_H__ */

include/linux/platform_data/dma-dw.h

@@ -49,6 +49,7 @@ struct dw_dma_slave {
  * @data_width: Maximum data width supported by hardware per AHB master
  *		(in bytes, power of 2)
  * @multi_block: Multi block transfers supported by hardware per channel.
+ * @protctl: Protection control signals setting per channel.
  */
 struct dw_dma_platform_data {
 	unsigned int	nr_channels;
@@ -65,6 +66,11 @@ struct dw_dma_platform_data {
 	unsigned char	nr_masters;
 	unsigned char	data_width[DW_DMA_MAX_NR_MASTERS];
 	unsigned char	multi_block[DW_DMA_MAX_NR_CHANNELS];
+#define CHAN_PROTCTL_PRIVILEGED		BIT(0)
+#define CHAN_PROTCTL_BUFFERABLE		BIT(1)
+#define CHAN_PROTCTL_CACHEABLE		BIT(2)
+#define CHAN_PROTCTL_MASK		GENMASK(2, 0)
+	unsigned char	protctl;
 };
 
 #endif /* _PLATFORM_DATA_DMA_DW_H */