From: Alex Elder <elder@linaro.org>
To: davem@davemloft.net, arnd@arndb.de, bjorn.andersson@linaro.org,
ilias.apalodimas@linaro.org
Cc: netdev@vger.kernel.org, devicetree@vger.kernel.org,
linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, syadagir@codeaurora.org,
mjavid@codeaurora.org, robh+dt@kernel.org, mark.rutland@arm.com
Subject: [RFC PATCH 02/12] soc: qcom: ipa: DMA helpers
Date: Tue, 6 Nov 2018 18:32:40 -0600 [thread overview]
Message-ID: <20181107003250.5832-3-elder@linaro.org> (raw)
In-Reply-To: <20181107003250.5832-1-elder@linaro.org>
This patch includes code implementing the IPA DMA module, which
defines a structure to represent a DMA allocation for the IPA device.
It's used throughout the IPA code.
Signed-off-by: Alex Elder <elder@linaro.org>
---
drivers/net/ipa/ipa_dma.c | 61 +++++++++++++++++++++++++++++++++++++++
drivers/net/ipa/ipa_dma.h | 61 +++++++++++++++++++++++++++++++++++++++
2 files changed, 122 insertions(+)
create mode 100644 drivers/net/ipa/ipa_dma.c
create mode 100644 drivers/net/ipa/ipa_dma.h
diff --git a/drivers/net/ipa/ipa_dma.c b/drivers/net/ipa/ipa_dma.c
new file mode 100644
index 000000000000..dfde59e5072a
--- /dev/null
+++ b/drivers/net/ipa/ipa_dma.c
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/* Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ * Copyright (C) 2018 Linaro Ltd.
+ */
+
+#include <linux/types.h>
+#include <linux/device.h>
+#include <linux/dma-mapping.h>
+#include <linux/string.h>
+
+#include "ipa_dma.h"
+
+static struct device *ipa_dma_dev;
+
+int ipa_dma_init(struct device *dev, u32 align)
+{
+ int ret;
+
+ /* Ensure DMA addresses will have the alignment we require */
+ if (dma_get_cache_alignment() % align)
+ return -ENOTSUPP;
+
+ ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
+ if (!ret)
+ ipa_dma_dev = dev;
+
+ return ret;
+}
+
+void ipa_dma_exit(void)
+{
+ ipa_dma_dev = NULL;
+}
+
+int ipa_dma_alloc(struct ipa_dma_mem *mem, size_t size, gfp_t gfp)
+{
+ dma_addr_t phys;
+ void *virt;
+
+ virt = dma_zalloc_coherent(ipa_dma_dev, size, &phys, gfp);
+ if (!virt)
+ return -ENOMEM;
+
+ mem->virt = virt;
+ mem->phys = phys;
+ mem->size = size;
+
+ return 0;
+}
+
+void ipa_dma_free(struct ipa_dma_mem *mem)
+{
+ dma_free_coherent(ipa_dma_dev, mem->size, mem->virt, mem->phys);
+ memset(mem, 0, sizeof(*mem));
+}
+
+void *ipa_dma_phys_to_virt(struct ipa_dma_mem *mem, dma_addr_t phys)
+{
+ return mem->virt + (phys - mem->phys);
+}
diff --git a/drivers/net/ipa/ipa_dma.h b/drivers/net/ipa/ipa_dma.h
new file mode 100644
index 000000000000..e211dbd9d4ec
--- /dev/null
+++ b/drivers/net/ipa/ipa_dma.h
@@ -0,0 +1,61 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/* Copyright (c) 2018, The Linux Foundation. All rights reserved.
+ * Copyright (C) 2018 Linaro Ltd.
+ */
+#ifndef _IPA_DMA_H_
+#define _IPA_DMA_H_
+
+#include <linux/types.h>
+#include <linux/device.h>
+
+/**
+ * struct ipa_dma_mem - IPA allocated DMA memory descriptor
+ * @virt: host virtual base address of allocated DMA memory
+ * @phys: bus physical base address of DMA memory
+ * @size: size (bytes) of DMA memory
+ */
+struct ipa_dma_mem {
+ void *virt;
+ dma_addr_t phys;
+ size_t size;
+};
+
+/**
+ * ipa_dma_init() - Initialize IPA DMA system.
+ * @dev: IPA device structure
+ * @align: Hardware required alignment for DMA memory
+ *
+ * Returns: 0 if successful, or a negative error code.
+ */
+int ipa_dma_init(struct device *dev, u32 align);
+
+/**
+ * ipa_dma_exit() - shut down/clean up IPA DMA system
+ */
+void ipa_dma_exit(void);
+
+/**
+ * ipa_dma_alloc() - allocate a DMA buffer, describe it in mem struct
+ * @mem: Memory structure to fill with allocation information.
+ * @size: Size of DMA buffer to allocate.
+ * @gfp: Allocation mode.
+ */
+int ipa_dma_alloc(struct ipa_dma_mem *mem, size_t size, gfp_t gfp);
+
+/**
+ * ipa_dma_free() - free a previously-allocated DMA buffer
+ * @mem: Information about DMA allocation to free
+ */
+void ipa_dma_free(struct ipa_dma_mem *mem);
+
+/**
+ * ipa_dma_phys_to_virt() - return the virtual equivalent of a DMA address
+ * @phys: DMA allocation information
+ * @phys: Physical address to convert
+ *
+ * Return: Virtual address corresponding to the given physical address
+ */
+void *ipa_dma_phys_to_virt(struct ipa_dma_mem *mem, dma_addr_t phys);
+
+#endif /* !_IPA_DMA_H_ */
--
2.17.1
next prev parent reply other threads:[~2018-11-07 0:33 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-11-07 0:32 [RFC PATCH 00/12] net: introduce Qualcomm IPA driver Alex Elder
2018-11-07 0:32 ` [RFC PATCH 01/12] dt-bindings: soc: qcom: add IPA bindings Alex Elder
2018-11-07 11:50 ` Arnd Bergmann
2018-11-09 22:38 ` Alex Elder
2018-11-07 14:59 ` Rob Herring
2018-11-09 22:38 ` Alex Elder
2018-11-11 1:40 ` Rob Herring
2018-11-13 16:28 ` Alex Elder
2018-11-07 0:32 ` Alex Elder [this message]
2018-11-07 12:17 ` [RFC PATCH 02/12] soc: qcom: ipa: DMA helpers Arnd Bergmann
2018-11-13 16:33 ` Alex Elder
2018-11-07 0:32 ` [RFC PATCH 03/12] soc: qcom: ipa: generic software interface Alex Elder
2018-11-07 0:32 ` [RFC PATCH 04/12] soc: qcom: ipa: immediate commands Alex Elder
2018-11-07 14:36 ` Arnd Bergmann
2018-11-13 16:58 ` Alex Elder
2018-11-07 0:32 ` [RFC PATCH 05/12] soc: qcom: ipa: IPA interrupts and the microcontroller Alex Elder
2018-11-07 0:32 ` [RFC PATCH 06/12] soc: qcom: ipa: QMI modem communication Alex Elder
2018-11-07 0:32 ` [RFC PATCH 07/12] soc: qcom: ipa: IPA register abstraction Alex Elder
2018-11-07 15:00 ` Arnd Bergmann
2018-11-15 2:48 ` Alex Elder
2018-11-15 14:42 ` Arnd Bergmann
2018-11-07 0:32 ` [RFC PATCH 08/12] soc: qcom: ipa: utility functions Alex Elder
2018-11-07 0:32 ` [RFC PATCH 09/12] soc: qcom: ipa: main IPA source file Alex Elder
2018-11-07 14:08 ` Arnd Bergmann
2018-11-15 3:11 ` Alex Elder
2018-11-07 0:32 ` [RFC PATCH 10/12] soc: qcom: ipa: data path Alex Elder
2018-11-07 14:55 ` Arnd Bergmann
2018-11-15 3:31 ` Alex Elder
2018-11-15 14:48 ` Arnd Bergmann
2018-11-07 0:32 ` [RFC PATCH 11/12] soc: qcom: ipa: IPA rmnet interface Alex Elder
2018-11-07 13:30 ` Arnd Bergmann
2018-11-07 15:26 ` Dan Williams
2018-11-07 0:32 ` [RFC PATCH 12/12] soc: qcom: ipa: build and "ipa_i.h" Alex Elder
2018-11-07 0:40 ` Randy Dunlap
2018-11-08 16:22 ` Alex Elder
2018-11-07 12:34 ` Arnd Bergmann
2018-11-07 15:46 ` [RFC PATCH 00/12] net: introduce Qualcomm IPA driver Arnd Bergmann
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