[PATCH v2 7/9] arm: twr-k70f120m: use Freescale eDMA driver with Kinetis SoC

Paul Osmialowski
2015-06-30T12:27:28Z

Note that <mach/memory.h> is needed (which is denoted by
CONFIG_NEED_MACH_MEMORY_H) as it provides macros required for proper
operation of DMA allocation functions.

Signed-off-by: Paul Osmialowski <pawelo@king.net.pl>
---
arch/arm/Kconfig | 4 ++
arch/arm/boot/dts/kinetis.dtsi | 34 ++++++++++++++++
arch/arm/mach-kinetis/include/mach/memory.h | 61 +++++++++++++++++++++++++++++
3 files changed, 99 insertions(+)
create mode 100644 arch/arm/mach-kinetis/include/mach/memory.h

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index b21592b..8ccffee 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -971,6 +971,10 @@ config ARCH_KINETIS
select CLKSRC_KINETIS
select PINCTRL
select PINCTRL_KINETIS
+ select DMADEVICES
+ select FSL_EDMA
+ select DMA_OF
+ select NEED_MACH_MEMORY_H
help
This enables support for the Freescale Kinetis MCUs

diff --git a/arch/arm/boot/dts/kinetis.dtsi b/arch/arm/boot/dts/kinetis.dtsi
index 5ff1d3b..c2861f5 100644
--- a/arch/arm/boot/dts/kinetis.dtsi
+++ b/arch/arm/boot/dts/kinetis.dtsi
@@ -19,6 +19,40 @@
};

soc {
+ edma: dma-controller@40008000 {
+ compatible = "fsl,kinetis-edma";
+ reg = <0x40008000 0x2000>, /* DMAC */
+ <0x40021000 0x1000>, /* DMAMUX0 */
+ <0x40022000 0x1000>; /* DMAMUX1 */
+ #dma-cells = <2>;
+ dma-channels = <32>;
+ interrupts = <0>, <1>, <2>, <3>,
+ <4>, <5>, <6>, <7>,
+ <8>, <9>, <10>, <11>,
+ <12>, <13>, <14>, <15>,
+ <16>;
+ interrupt-names = "edma-tx-0,16",
+ "edma-tx-1,17",
+ "edma-tx-2,18",
+ "edma-tx-3,19",
+ "edma-tx-4,20",
+ "edma-tx-5,21",
+ "edma-tx-6,22",
+ "edma-tx-7,23",
+ "edma-tx-8,24",
+ "edma-tx-9,25",
+ "edma-tx-10,26",
+ "edma-tx-11,27",
+ "edma-tx-12,28",
+ "edma-tx-13,29",
+ "edma-tx-14,30",
+ "edma-tx-15,31",
+ "edma-err";
+ clocks = <&mcg_cclk_gate 6 1>,
+ <&mcg_pclk_gate 5 1>, <&mcg_pclk_gate 5 2>;
+ clock-names = "edma", "dmamux0", "dmamux1";
+ };
+
portA: pinmux@40049000 {
compatible = "fsl,kinetis-padconf";
reg = <0x40049000 0x1000>;
diff --git a/arch/arm/mach-kinetis/include/mach/memory.h b/arch/arm/mach-kinetis/include/mach/memory.h
new file mode 100644
index 0000000..8bad034
--- /dev/null
+++ b/arch/arm/mach-kinetis/include/mach/memory.h
@@ -0,0 +1,61 @@
+/*
+ * Based on original code by Alexander Potashev <aspotashev@emcraft.com>
+ *
+ * (C) Copyright 2011, 2012
+ * Emcraft Systems, <www.emcraft.com>
+ * Alexander Potashev <aspotashev@emcraft.com>
+ *
+ * Copyright (C) 2015 Paul Osmialowski <pawelo@king.net.pl>
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation.
+ */
+
+#ifndef _MACH_KINETIS_MEMORY_H
+#define _MACH_KINETIS_MEMORY_H
+
+#ifndef __ASSEMBLY__
+
+/*
+ * On Kinetis K70, consistent DMA memory resides in a special
+ * DDRAM alias region (non-cacheable DDRAM at 0x80000000).
+ *
+ */
+#define KINETIS_PHYS_DMA_OFFSET UL(0x80000000)
+
+/*
+ * Mask of the field used to distinguish DDRAM aliases
+ */
+#define KINETIS_DRAM_ALIAS_MASK UL(0xf8000000)
+
+/*
+ * This macro converts an address in the kernel run-time memory
+ * to an alias in the non-cacheable memory region
+ */
+#define KINETIS_DMA_ALIAS_ADDR(addr) \
+ (((unsigned long)(addr) & ~KINETIS_DRAM_ALIAS_MASK) | \
+ (KINETIS_PHYS_DMA_OFFSET & KINETIS_DRAM_ALIAS_MASK))
+
+/*
+ * This macro converts an address in the kernel code or
+ * in the non-cacheable DMA region to an alias in
+ * the run-time kernel memory region
+ */
+#define KINETIS_PHYS_ALIAS_ADDR(addr) \
+ ((unsigned long)(addr) & ~KINETIS_DRAM_ALIAS_MASK)
+
+#define __arch_dma_to_pfn(dev, addr) __phys_to_pfn(addr)
+
+#define __arch_pfn_to_dma(dev, pfn) \
+ ((dma_addr_t)KINETIS_DMA_ALIAS_ADDR(__pfn_to_phys(pfn)))
+
+#define __arch_dma_to_virt(dev, addr) \
+ ((void *)KINETIS_PHYS_ALIAS_ADDR(addr))
+
+#define __arch_virt_to_dma(dev, addr) \
+ ((dma_addr_t)KINETIS_DMA_ALIAS_ADDR(addr))
+
+#endif /* __ASSEMBLY__ */
+
+#endif /*_MACH_KINETIS_MEMORY_H */
--
2.3.6