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98 lines
2.1 KiB
C++
98 lines
2.1 KiB
C++
/*
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* \brief Advanced DMA 2
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* \author Martin Stein
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* \date 2015-02-05
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*/
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/*
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* Copyright (C) 2015-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _ADMA2_H_
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#define _ADMA2_H_
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/* Genode includes */
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#include <util/register.h>
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#include <base/attached_ram_dataspace.h>
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namespace Adma2
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{
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using namespace Genode;
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class Desc;
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class Table;
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}
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/**
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* Descriptor layout
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*/
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struct Adma2::Desc : Register<64>
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{
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struct Valid : Bitfield<0, 1> { };
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struct End : Bitfield<1, 1> { };
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struct Int : Bitfield<2, 1> { };
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struct Act1 : Bitfield<4, 1> { };
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struct Act2 : Bitfield<5, 1> { };
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struct Length : Bitfield<16, 16>
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{
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/*
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* According to the 'SD Specifications, Part A2, SD Host
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* Controller, Simplified Specification, Version 2.00, February 8,
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* 2007, Table 1-10', a maximum length of 65536 bytes is achieved
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* by value 0. However, if we do so, the completion host-signal
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* times out now and then. Thus, we use the next lower possible
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* value.
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*/
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static constexpr addr_t align_log2 = 2;
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static constexpr size_t max = (1 << WIDTH) - (1 << align_log2);
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};
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struct Address : Bitfield<32, 32> { };
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};
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/**
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* Descriptor table
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*/
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class Adma2::Table
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{
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private:
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static size_t constexpr _max_desc = 1024;
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static size_t constexpr _ds_size = _max_desc * sizeof(Desc::access_t);
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Attached_ram_dataspace _ds;
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Desc::access_t * const _base_virt;
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addr_t const _base_phys;
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/*
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* Noncopyable
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*/
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Table(Table const &);
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Table &operator = (Table const &);
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public:
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Table(Ram_allocator &ram, Region_map &rm);
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/**
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* Marshal descriptors according to block request
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*
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* \param size request size in bytes
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* \param buffer_phys physical base of transfer buffer
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*
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* \retval 0 success
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* \retval -1 error
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*/
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int setup_request(size_t const size, addr_t const buffer_phys);
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/*
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* Accessors
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*/
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addr_t base_phys() const { return _base_phys; }
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};
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#endif /* _ADMA2_H_ */
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