Merge tag 'dmaengine-6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine

Pull dmaengine updates from Vinod Koul:
 "New support:

    - Qualcomm SDM670, SM6115 and SM6375 GPI controller support

    - Ingenic JZ4755 dmaengine support

    - Removal of iop-adma driver

  Updates:

   - Tegra support for dma-channel-mask

   - at_hdmac cleanup and virt-chan support for this driver"

* tag 'dmaengine-6.2-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/vkoul/dmaengine: (46 commits)
  dmaengine: Revert "dmaengine: remove s3c24xx driver"
  dmaengine: tegra: Add support for dma-channel-mask
  dt-bindings: dmaengine: Add dma-channel-mask to Tegra GPCDMA
  dmaengine: idxd: Remove linux/msi.h include
  dt-bindings: dmaengine: qcom: gpi: add compatible for SM6375
  dmaengine: idxd: Fix crc_val field for completion record
  dmaengine: at_hdmac: Convert driver to use virt-dma
  dmaengine: at_hdmac: Remove unused member of at_dma_chan
  dmaengine: at_hdmac: Rename "chan_common" to "dma_chan"
  dmaengine: at_hdmac: Rename "dma_common" to "dma_device"
  dmaengine: at_hdmac: Use bitfield access macros
  dmaengine: at_hdmac: Keep register definitions and structures private to at_hdmac.c
  dmaengine: at_hdmac: Set include entries in alphabetic order
  dmaengine: at_hdmac: Use pm_ptr()
  dmaengine: at_hdmac: Use devm_clk_get()
  dmaengine: at_hdmac: Use devm_platform_ioremap_resource
  dmaengine: at_hdmac: Use devm_kzalloc() and struct_size()
  dmaengine: at_hdmac: Introduce atc_get_llis_residue()
  dmaengine: at_hdmac: s/atc_get_bytes_left/atc_get_residue
  dmaengine: at_hdmac: Pass residue by address to avoid unnecessary implicit casts
  ...

Author: torvalds

Documentation/ABI/stable/sysfs-driver-dma-idxd

@@ -22,6 +22,7 @@ Date:           Oct 25, 2019
 KernelVersion:  5.6.0
 Contact:        [email protected]
 Description:    The largest number of work descriptors in a batch.
+                It's not visible when the device does not support batch.
 
 What:           /sys/bus/dsa/devices/dsa<m>/max_work_queues_size
 Date:           Oct 25, 2019
@@ -49,6 +50,8 @@ Description:    The total number of read buffers supported by this device.
 		The read buffers represent resources within the DSA
 		implementation, and these resources are allocated by engines to
 		support operations. See DSA spec v1.2 9.2.4 Total Read Buffers.
+		It's not visible when the device does not support Read Buffer
+		allocation control.
 
 What:           /sys/bus/dsa/devices/dsa<m>/max_transfer_size
 Date:           Oct 25, 2019
@@ -122,6 +125,8 @@ Contact:        [email protected]
 Description:    The maximum number of read buffers that may be in use at
 		one time by operations that access low bandwidth memory in the
 		device. See DSA spec v1.2 9.2.8 GENCFG on Global Read Buffer Limit.
+		It's not visible when the device does not support Read Buffer
+		allocation control.
 
 What:		/sys/bus/dsa/devices/dsa<m>/cmd_status
 Date:		Aug 28, 2020
@@ -205,6 +210,7 @@ KernelVersion:	5.10.0
 Contact:	[email protected]
 Description:	The max batch size for this workqueue. Cannot exceed device
 		max batch size. Configurable parameter.
+		It's not visible when the device does not support batch.
 
 What:		/sys/bus/dsa/devices/wq<m>.<n>/ats_disable
 Date:		Nov 13, 2020
@@ -250,6 +256,8 @@ KernelVersion:	5.17.0
 Contact:	[email protected]
 Description:	Enable the use of global read buffer limit for the group. See DSA
 		spec v1.2 9.2.18 GRPCFG Use Global Read Buffer Limit.
+		It's not visible when the device does not support Read Buffer
+		allocation control.
 
 What:		/sys/bus/dsa/devices/group<m>.<n>/read_buffers_allowed
 Date:		Dec 10, 2021
@@ -258,6 +266,8 @@ Contact:	[email protected]
 Description:	Indicates max number of read buffers that may be in use at one time
 		by all engines in the group. See DSA spec v1.2 9.2.18 GRPCFG Read
 		Buffers Allowed.
+		It's not visible when the device does not support Read Buffer
+		allocation control.
 
 What:		/sys/bus/dsa/devices/group<m>.<n>/read_buffers_reserved
 Date:		Dec 10, 2021
@@ -266,6 +276,8 @@ Contact:	[email protected]
 Description:	Indicates the number of Read Buffers reserved for the use of
 		engines in the group. See DSA spec v1.2 9.2.18 GRPCFG Read Buffers
 		Reserved.
+		It's not visible when the device does not support Read Buffer
+		allocation control.
 
 What:		/sys/bus/dsa/devices/group<m>.<n>/desc_progress_limit
 Date:		Sept 14, 2022

Documentation/devicetree/bindings/dma/ingenic,dma.yaml

@@ -18,6 +18,7 @@ properties:
       - enum:
           - ingenic,jz4740-dma
           - ingenic,jz4725b-dma
+          - ingenic,jz4755-dma
           - ingenic,jz4760-dma
           - ingenic,jz4760-bdma
           - ingenic,jz4760-mdma

Documentation/devicetree/bindings/dma/nvidia,tegra186-gpc-dma.yaml

@@ -39,7 +39,7 @@ properties:
       Should contain all of the per-channel DMA interrupts in
       ascending order with respect to the DMA channel index.
     minItems: 1
-    maxItems: 31
+    maxItems: 32
 
   resets:
     maxItems: 1
@@ -52,6 +52,9 @@ properties:
 
   dma-coherent: true
 
+  dma-channel-mask:
+    maxItems: 1
+
 required:
   - compatible
   - reg
@@ -60,6 +63,7 @@ required:
   - reset-names
   - "#dma-cells"
   - iommus
+  - dma-channel-mask
 
 additionalProperties: false
 
@@ -108,5 +112,6 @@ examples:
         #dma-cells = <1>;
         iommus = <&smmu TEGRA186_SID_GPCDMA_0>;
         dma-coherent;
+        dma-channel-mask = <0xfffffffe>;
     };
 ...

Documentation/devicetree/bindings/dma/qcom,gpi.yaml

@@ -18,14 +18,24 @@ allOf:
 
 properties:
   compatible:
-    enum:
-      - qcom,sc7280-gpi-dma
-      - qcom,sdm845-gpi-dma
-      - qcom,sm6350-gpi-dma
-      - qcom,sm8150-gpi-dma
-      - qcom,sm8250-gpi-dma
-      - qcom,sm8350-gpi-dma
-      - qcom,sm8450-gpi-dma
+    oneOf:
+      - enum:
+          - qcom,sdm845-gpi-dma
+          - qcom,sm6350-gpi-dma
+      - items:
+          - enum:
+              - qcom,sc7280-gpi-dma
+              - qcom,sm6115-gpi-dma
+              - qcom,sm6375-gpi-dma
+              - qcom,sm8350-gpi-dma
+              - qcom,sm8450-gpi-dma
+          - const: qcom,sm6350-gpi-dma
+      - items:
+          - enum:
+              - qcom,sdm670-gpi-dma
+              - qcom,sm8150-gpi-dma
+              - qcom,sm8250-gpi-dma
+          - const: qcom,sdm845-gpi-dma
 
   reg:
     maxItems: 1

Documentation/driver-api/driver-model/devres.rst

@@ -450,6 +450,7 @@ SERDEV
 
 SLAVE DMA ENGINE
   devm_acpi_dma_controller_register()
+  devm_acpi_dma_controller_free()
 
 SPI
   devm_spi_alloc_master()

MAINTAINERS

@@ -10460,11 +10460,6 @@ T:	git git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu.git
 F:	drivers/iommu/intel/
 F:	include/linux/intel-svm.h
 
-INTEL IOP-ADMA DMA DRIVER
-R:	Dan Williams <[email protected]>
-S:	Odd fixes
-F:	drivers/dma/iop-adma.c
-
 INTEL IPU3 CSI-2 CIO2 DRIVER
 M:	Yong Zhi <[email protected]>
 M:	Sakari Ailus <[email protected]>
@@ -13629,7 +13624,6 @@ L:	[email protected]
 S:	Supported
 F:	Documentation/devicetree/bindings/dma/atmel-dma.txt
 F:	drivers/dma/at_hdmac.c
-F:	drivers/dma/at_hdmac_regs.h
 F:	drivers/dma/at_xdmac.c
 F:	include/dt-bindings/dma/at91.h
 

drivers/dma/Kconfig

@@ -97,6 +97,7 @@ config AT_HDMAC
 	tristate "Atmel AHB DMA support"
 	depends on ARCH_AT91
 	select DMA_ENGINE
+	select DMA_VIRTUAL_CHANNELS
 	help
 	  Support the Atmel AHB DMA controller.
 
@@ -357,14 +358,6 @@ config INTEL_IOATDMA
 
 	  If unsure, say N.
 
-config INTEL_IOP_ADMA
-	tristate "Intel IOP32x ADMA support"
-	depends on ARCH_IOP32X || COMPILE_TEST
-	select DMA_ENGINE
-	select ASYNC_TX_ENABLE_CHANNEL_SWITCH
-	help
-	  Enable support for the Intel(R) IOP Series RAID engines.
-
 config K3_DMA
 	tristate "Hisilicon K3 DMA support"
 	depends on ARCH_HI3xxx || ARCH_HISI || COMPILE_TEST

drivers/dma/Makefile

@@ -44,7 +44,6 @@ obj-$(CONFIG_IMX_SDMA) += imx-sdma.o
 obj-$(CONFIG_INTEL_IDMA64) += idma64.o
 obj-$(CONFIG_INTEL_IOATDMA) += ioat/
 obj-y += idxd/
-obj-$(CONFIG_INTEL_IOP_ADMA) += iop-adma.o
 obj-$(CONFIG_K3_DMA) += k3dma.o
 obj-$(CONFIG_LPC18XX_DMAMUX) += lpc18xx-dmamux.o
 obj-$(CONFIG_MILBEAUT_HDMAC) += milbeaut-hdmac.o

drivers/dma/apple-admac.c

@@ -21,6 +21,12 @@
 #define NCHANNELS_MAX	64
 #define IRQ_NOUTPUTS	4
 
+/*
+ * For allocation purposes we split the cache
+ * memory into blocks of fixed size (given in bytes).
+ */
+#define SRAM_BLOCK	2048
+
 #define RING_WRITE_SLOT		GENMASK(1, 0)
 #define RING_READ_SLOT		GENMASK(5, 4)
 #define RING_FULL		BIT(9)
@@ -36,6 +42,9 @@
 #define REG_TX_STOP		0x0004
 #define REG_RX_START		0x0008
 #define REG_RX_STOP		0x000c
+#define REG_IMPRINT		0x0090
+#define REG_TX_SRAM_SIZE	0x0094
+#define REG_RX_SRAM_SIZE	0x0098
 
 #define REG_CHAN_CTL(ch)	(0x8000 + (ch) * 0x200)
 #define REG_CHAN_CTL_RST_RINGS	BIT(0)
@@ -53,7 +62,9 @@
 #define BUS_WIDTH_FRAME_2_WORDS	0x10
 #define BUS_WIDTH_FRAME_4_WORDS	0x20
 
-#define CHAN_BUFSIZE		0x8000
+#define REG_CHAN_SRAM_CARVEOUT(ch)	(0x8050 + (ch) * 0x200)
+#define CHAN_SRAM_CARVEOUT_SIZE		GENMASK(31, 16)
+#define CHAN_SRAM_CARVEOUT_BASE		GENMASK(15, 0)
 
 #define REG_CHAN_FIFOCTL(ch)	(0x8054 + (ch) * 0x200)
 #define CHAN_FIFOCTL_LIMIT	GENMASK(31, 16)
@@ -76,6 +87,8 @@ struct admac_chan {
 	struct dma_chan chan;
 	struct tasklet_struct tasklet;
 
+	u32 carveout;
+
 	spinlock_t lock;
 	struct admac_tx *current_tx;
 	int nperiod_acks;
@@ -92,12 +105,24 @@ struct admac_chan {
 	struct list_head to_free;
 };
 
+struct admac_sram {
+	u32 size;
+	/*
+	 * SRAM_CARVEOUT has 16-bit fields, so the SRAM cannot be larger than
+	 * 64K and a 32-bit bitfield over 2K blocks covers it.
+	 */
+	u32 allocated;
+};
+
 struct admac_data {
 	struct dma_device dma;
 	struct device *dev;
 	__iomem void *base;
 	struct reset_control *rstc;
 
+	struct mutex cache_alloc_lock;
+	struct admac_sram txcache, rxcache;
+
 	int irq;
 	int irq_index;
 	int nchannels;
@@ -118,6 +143,60 @@ struct admac_tx {
 	struct list_head node;
 };
 
+static int admac_alloc_sram_carveout(struct admac_data *ad,
+				     enum dma_transfer_direction dir,
+				     u32 *out)
+{
+	struct admac_sram *sram;
+	int i, ret = 0, nblocks;
+
+	if (dir == DMA_MEM_TO_DEV)
+		sram = &ad->txcache;
+	else
+		sram = &ad->rxcache;
+
+	mutex_lock(&ad->cache_alloc_lock);
+
+	nblocks = sram->size / SRAM_BLOCK;
+	for (i = 0; i < nblocks; i++)
+		if (!(sram->allocated & BIT(i)))
+			break;
+
+	if (i < nblocks) {
+		*out = FIELD_PREP(CHAN_SRAM_CARVEOUT_BASE, i * SRAM_BLOCK) |
+			FIELD_PREP(CHAN_SRAM_CARVEOUT_SIZE, SRAM_BLOCK);
+		sram->allocated |= BIT(i);
+	} else {
+		ret = -EBUSY;
+	}
+
+	mutex_unlock(&ad->cache_alloc_lock);
+
+	return ret;
+}
+
+static void admac_free_sram_carveout(struct admac_data *ad,
+				     enum dma_transfer_direction dir,
+				     u32 carveout)
+{
+	struct admac_sram *sram;
+	u32 base = FIELD_GET(CHAN_SRAM_CARVEOUT_BASE, carveout);
+	int i;
+
+	if (dir == DMA_MEM_TO_DEV)
+		sram = &ad->txcache;
+	else
+		sram = &ad->rxcache;
+
+	if (WARN_ON(base >= sram->size))
+		return;
+
+	mutex_lock(&ad->cache_alloc_lock);
+	i = base / SRAM_BLOCK;
+	sram->allocated &= ~BIT(i);
+	mutex_unlock(&ad->cache_alloc_lock);
+}
+
 static void admac_modify(struct admac_data *ad, int reg, u32 mask, u32 val)
 {
 	void __iomem *addr = ad->base + reg;
@@ -466,15 +545,28 @@ static void admac_synchronize(struct dma_chan *chan)
 static int admac_alloc_chan_resources(struct dma_chan *chan)
 {
 	struct admac_chan *adchan = to_admac_chan(chan);
+	struct admac_data *ad = adchan->host;
+	int ret;
 
 	dma_cookie_init(&adchan->chan);
+	ret = admac_alloc_sram_carveout(ad, admac_chan_direction(adchan->no),
+					&adchan->carveout);
+	if (ret < 0)
+		return ret;
+
+	writel_relaxed(adchan->carveout,
+		       ad->base + REG_CHAN_SRAM_CARVEOUT(adchan->no));
 	return 0;
 }
 
 static void admac_free_chan_resources(struct dma_chan *chan)
 {
+	struct admac_chan *adchan = to_admac_chan(chan);
+
 	admac_terminate_all(chan);
 	admac_synchronize(chan);
+	admac_free_sram_carveout(adchan->host, admac_chan_direction(adchan->no),
+				 adchan->carveout);
 }
 
 static struct dma_chan *admac_dma_of_xlate(struct of_phandle_args *dma_spec,
@@ -712,6 +804,7 @@ static int admac_probe(struct platform_device *pdev)
 	platform_set_drvdata(pdev, ad);
 	ad->dev = &pdev->dev;
 	ad->nchannels = nchannels;
+	mutex_init(&ad->cache_alloc_lock);
 
 	/*
 	 * The controller has 4 IRQ outputs. Try them all until
@@ -801,6 +894,13 @@ static int admac_probe(struct platform_device *pdev)
 		goto free_irq;
 	}
 
+	ad->txcache.size = readl_relaxed(ad->base + REG_TX_SRAM_SIZE);
+	ad->rxcache.size = readl_relaxed(ad->base + REG_RX_SRAM_SIZE);
+
+	dev_info(&pdev->dev, "Audio DMA Controller\n");
+	dev_info(&pdev->dev, "imprint %x TX cache %u RX cache %u\n",
+		 readl_relaxed(ad->base + REG_IMPRINT), ad->txcache.size, ad->rxcache.size);
+
 	return 0;
 
 free_irq: