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From 740c72fe92a5536060ac6debbfe0a26c0b9b8770 Mon Sep 17 00:00:00 2001
From: Haavard Skinnemoen <hskinnemoen@atmel.com>
Date: Mon, 11 Sep 2006 17:59:59 +0200
Subject: [PATCH] AVR32: DMA controller framework
This patch puts the DMA controller framework used in earlier BSPs back.
It was removed before the AVR32 patches went into -mm, and it should
be removed here as well as soon as we have an alternative.
---
arch/avr32/kernel/Makefile | 1
arch/avr32/kernel/dma-controller.c | 34 +++++++
include/asm-avr32/dma-controller.h | 165 ++++++++++++++++++++++++++++++++++++
3 files changed, 200 insertions(+), 0 deletions(-)
diff --git a/arch/avr32/kernel/Makefile b/arch/avr32/kernel/Makefile
index 90e5aff..b6afc0c 100644
--- a/arch/avr32/kernel/Makefile
+++ b/arch/avr32/kernel/Makefile
@@ -9,6 +9,7 @@ obj-y += syscall_table.o syscall-stub
obj-y += setup.o traps.o semaphore.o ptrace.o
obj-y += signal.o sys_avr32.o process.o time.o
obj-y += init_task.o switch_to.o cpu.o
+obj-y += dma-controller.o
obj-$(CONFIG_MODULES) += module.o avr32_ksyms.o
obj-$(CONFIG_KPROBES) += kprobes.o
diff --git a/arch/avr32/kernel/dma-controller.c b/arch/avr32/kernel/dma-controller.c
new file mode 100644
index 0000000..fb654b3
--- /dev/null
+++ b/arch/avr32/kernel/dma-controller.c
@@ -0,0 +1,34 @@
+/*
+ * Preliminary DMA controller framework for AVR32
+ *
+ * Copyright (C) 2005-2006 Atmel Corporation
+ *
+ * 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.
+ */
+#include <asm/dma-controller.h>
+
+static LIST_HEAD(controllers);
+
+int register_dma_controller(struct dma_controller *dmac)
+{
+ static int next_id;
+
+ dmac->id = next_id++;
+ list_add_tail(&dmac->list, &controllers);
+
+ return 0;
+}
+EXPORT_SYMBOL(register_dma_controller);
+
+struct dma_controller *find_dma_controller(int id)
+{
+ struct dma_controller *dmac;
+
+ list_for_each_entry(dmac, &controllers, list)
+ if (dmac->id == id)
+ return dmac;
+ return NULL;
+}
+EXPORT_SYMBOL(find_dma_controller);
diff --git a/include/asm-avr32/dma-controller.h b/include/asm-avr32/dma-controller.h
new file mode 100644
index 0000000..8c67601
--- /dev/null
+++ b/include/asm-avr32/dma-controller.h
@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 2005-2006 Atmel Corporation
+ *
+ * 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 __ASM_AVR32_DMA_CONTROLLER_H
+#define __ASM_AVR32_DMA_CONTROLLER_H
+
+#include <linux/device.h>
+
+#define DMA_DIR_MEM_TO_MEM 0x0000
+#define DMA_DIR_MEM_TO_PERIPH 0x0001
+#define DMA_DIR_PERIPH_TO_MEM 0x0002
+#define DMA_DIR_PERIPH_TO_PERIPH 0x0003
+
+#define DMA_WIDTH_8BIT 0
+#define DMA_WIDTH_16BIT 1
+#define DMA_WIDTH_32BIT 2
+
+struct dma_request {
+ struct dma_controller *dmac;
+ struct list_head list;
+
+ unsigned short channel;
+
+ void (*xfer_complete)(struct dma_request *req);
+ void (*block_complete)(struct dma_request *req);
+ void (*error)(struct dma_request *req);
+};
+
+struct dma_request_sg {
+ struct dma_request req;
+
+ int nr_sg;
+ struct scatterlist *sg;
+ unsigned long block_size;
+
+ dma_addr_t data_reg;
+ unsigned short periph_id;
+
+ unsigned char direction;
+ unsigned char width;
+};
+#define to_dma_request_sg(_req) \
+ container_of(_req, struct dma_request_sg, req)
+
+struct dma_request_cyclic {
+ struct dma_request req;
+
+ int periods;
+ unsigned long buffer_size;
+
+ dma_addr_t buffer_start;
+ dma_addr_t data_reg;
+
+ unsigned short periph_id;
+ unsigned char direction;
+ unsigned char width;
+
+ void *dev_id;
+};
+#define to_dma_request_cyclic(_req) \
+ container_of(_req, struct dma_request_cyclic, req)
+
+struct dma_request_memcpy {
+ struct dma_request req;
+
+ dma_addr_t src_addr;
+ unsigned int src_width;
+ unsigned int src_stride;
+
+ dma_addr_t dst_addr;
+ unsigned int dst_width;
+ unsigned int dst_stride;
+
+ size_t length;
+
+ unsigned short src_reverse:1;
+ unsigned short dst_reverse:1;
+};
+#define to_dma_request_memcpy(_req) \
+ container_of(_req, struct dma_request_memcpy, req)
+
+struct dma_controller {
+ struct list_head list;
+ int id;
+ struct device *dev;
+
+ int (*alloc_channel)(struct dma_controller *dmac);
+ void (*release_channel)(struct dma_controller *dmac,
+ int channel);
+ int (*prepare_request_sg)(struct dma_controller *dmac,
+ struct dma_request_sg *req);
+ int (*prepare_request_cyclic)(struct dma_controller *dmac,
+ struct dma_request_cyclic *req);
+ int (*prepare_request_memcpy)(struct dma_controller *dmac,
+ struct dma_request_memcpy *req);
+ int (*start_request)(struct dma_controller *dmac,
+ unsigned int channel);
+ int (*stop_request)(struct dma_controller *dmac,
+ unsigned int channel);
+ dma_addr_t (*get_current_pos)(struct dma_controller *dmac,
+ unsigned int channel);
+};
+
+static inline int
+dma_alloc_channel(struct dma_controller *dmac)
+{
+ return dmac->alloc_channel(dmac);
+}
+
+static inline void
+dma_release_channel(struct dma_controller *dmac, int chan)
+{
+ dmac->release_channel(dmac, chan);
+}
+
+static inline int
+dma_prepare_request_sg(struct dma_controller *dmac,
+ struct dma_request_sg *req)
+{
+ return dmac->prepare_request_sg(dmac, req);
+}
+
+static inline int
+dma_prepare_request_cyclic(struct dma_controller *dmac,
+ struct dma_request_cyclic *req)
+{
+ return dmac->prepare_request_cyclic(dmac, req);
+}
+
+static inline int
+dma_prepare_request_memcpy(struct dma_controller *dmac,
+ struct dma_request_memcpy *req)
+{
+ return dmac->prepare_request_memcpy(dmac, req);
+}
+
+static inline int
+dma_start_request(struct dma_controller *dmac,
+ unsigned int channel)
+{
+ return dmac->start_request(dmac, channel);
+}
+
+static inline int
+dma_stop_request(struct dma_controller *dmac,
+ unsigned int channel)
+{
+ return dmac->stop_request(dmac, channel);
+}
+
+static inline dma_addr_t
+dma_get_current_pos(struct dma_controller *dmac,
+ unsigned int channel)
+{
+ return dmac->get_current_pos(dmac, channel);
+}
+
+extern int register_dma_controller(struct dma_controller *dmac);
+extern struct dma_controller *find_dma_controller(int id);
+
+#endif /* __ASM_AVR32_DMA_CONTROLLER_H */
--
1.4.1.1
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