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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: barebox@lists.infradead.org
Cc: Ahmad Fatoum <a.fatoum@pengutronix.de>, rcz@pengutronix.de
Subject: [PATCH v2 10/20] RISC-V: add cacheless HAS_DMA support
Date: Tue, 16 Mar 2021 09:04:55 +0100	[thread overview]
Message-ID: <20210316080505.19361-11-a.fatoum@pengutronix.de> (raw)
In-Reply-To: <20210316080505.19361-1-a.fatoum@pengutronix.de>

Define some stubs, so we can get virtio MMIO working on RISC-V
in QEMU. As we don't yet have MMU support, this is sufficient.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 arch/riscv/Kconfig           |  1 +
 arch/riscv/include/asm/dma.h | 44 ++++++++++++++++++++++++++++++++++++
 include/dma.h                |  1 +
 3 files changed, 46 insertions(+)
 create mode 100644 arch/riscv/include/asm/dma.h

diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index c8d63f99bb28..a7f362d8e80c 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -8,6 +8,7 @@ config RISCV
 	select COMMON_CLK
 	select COMMON_CLK_OF_PROVIDER
 	select CLKDEV_LOOKUP
+	select HAS_DMA
 
 config ARCH_TEXT_BASE
 	hex
diff --git a/arch/riscv/include/asm/dma.h b/arch/riscv/include/asm/dma.h
new file mode 100644
index 000000000000..4204653984a3
--- /dev/null
+++ b/arch/riscv/include/asm/dma.h
@@ -0,0 +1,44 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_DMA_MAPPING_H
+#define _ASM_DMA_MAPPING_H
+
+#include <common.h>
+#include <xfuncs.h>
+#include <linux/build_bug.h>
+#include <malloc.h>
+
+#ifdef CONFIG_MMU
+#error DMA stubs need be replaced when using MMU and caches
+#endif
+
+static inline void *dma_alloc_coherent(size_t size, dma_addr_t *dma_handle)
+{
+	void *ret;
+
+	ret = xmemalign(PAGE_SIZE, size);
+
+	memset(ret, 0, size);
+
+	if (dma_handle)
+		*dma_handle = (dma_addr_t)ret;
+
+	return ret;
+}
+
+static inline void dma_free_coherent(void *vaddr, dma_addr_t dma_handle,
+				     size_t size)
+{
+	free(vaddr);
+}
+
+static inline void dma_sync_single_for_cpu(dma_addr_t address, size_t size,
+					   enum dma_data_direction dir)
+{
+}
+
+static inline void dma_sync_single_for_device(dma_addr_t address, size_t size,
+					      enum dma_data_direction dir)
+{
+}
+
+#endif /* _ASM_DMA_MAPPING_H */
diff --git a/include/dma.h b/include/dma.h
index 07b79cd91893..1b1cb3a40796 100644
--- a/include/dma.h
+++ b/include/dma.h
@@ -11,6 +11,7 @@
 
 #include <dma-dir.h>
 #include <asm/dma.h>
+#include <driver.h>
 
 #define DMA_ADDRESS_BROKEN	NULL
 
-- 
2.29.2


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  parent reply	other threads:[~2021-03-16  8:07 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-16  8:04 [PATCH v2 00/20] RISC-V: rework for PBL, VIRT and 64-Bit support Ahmad Fatoum
2021-03-16  8:04 ` [PATCH v2 01/20] partitions: don't allocate dma capable memory Ahmad Fatoum
2021-03-16  8:04 ` [PATCH v2 02/20] images: make BOARD_ARM_GENERIC_DT available for other arches Ahmad Fatoum
2021-03-16  8:04 ` [PATCH v2 03/20] ARM: make ARM_USE_COMPRESSED_DTB " Ahmad Fatoum
2021-03-16  8:04 ` [PATCH v2 04/20] ARM: aarch64: ommit unused label in assembly Ahmad Fatoum
2021-03-16  8:04 ` [PATCH v2 05/20] serial: virtio-console: depend on, but don't select VIRTIO Ahmad Fatoum
2021-03-16  8:04 ` [PATCH v2 06/20] filetype: detect RISC-V Linux kernel image Ahmad Fatoum
2021-03-16  8:04 ` [PATCH v2 07/20] asm: unaligned: don't do unaligned accesses Ahmad Fatoum
2021-03-16  8:04 ` [PATCH v2 08/20] RISC-V: debug_ll: ns16550: align C access size with assembly's Ahmad Fatoum
2021-03-16  8:04 ` [PATCH v2 09/20] RISC-V: drop duplicate or unneeded cflags Ahmad Fatoum
2021-03-16  8:04 ` Ahmad Fatoum [this message]
2021-03-16  8:04 ` [PATCH v2 11/20] RISC-V: erizo: move to arch/riscv/boards/erizo Ahmad Fatoum
2021-03-16  8:04 ` [PATCH v2 12/20] RISC-V: import Linux' optimized string functions Ahmad Fatoum
2021-03-16  8:04 ` [PATCH v2 13/20] RISC-V: implement PBL and relocation support Ahmad Fatoum
2021-03-16  8:04 ` [PATCH v2 14/20] RISC-V: erizo: migrate to PBL Ahmad Fatoum
2021-03-16 14:12   ` Antony Pavlov
2021-03-16 18:38     ` Ahmad Fatoum
2021-03-19 15:37       ` Antony Pavlov
2021-03-19 18:28         ` Ahmad Fatoum
2021-03-20  5:55           ` Antony Pavlov
2021-03-21 15:14             ` Ahmad Fatoum
2021-03-20  7:49   ` Antony Pavlov
2021-03-21 15:16     ` Ahmad Fatoum
2021-03-16  8:05 ` [PATCH v2 15/20] RISC-V: support symbol names in barebox image Ahmad Fatoum
2021-03-16  8:05 ` [PATCH v2 16/20] RISC-V: add 64-bit support Ahmad Fatoum
2021-03-16  8:05 ` [PATCH v2 17/20] RISC-V: add generic DT image Ahmad Fatoum
2021-03-16  8:05 ` [PATCH v2 18/20] clocksource: add driver for RISC-V and CLINT timers Ahmad Fatoum
2021-03-16  8:05 ` [PATCH v2 19/20] power: reset: add drivers for generic syscon reset and poweroff Ahmad Fatoum
2021-03-16  8:05 ` [PATCH v2 20/20] RISC-V: add Qemu virt support Ahmad Fatoum

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