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648 lines
20 KiB
C++
648 lines
20 KiB
C++
/*
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* \brief Generic MMIO access framework
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* \author Martin stein
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* \date 2011-10-26
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*/
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/*
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* Copyright (C) 2011-2013 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 General Public License version 2.
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*/
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#ifndef _INCLUDE__UTIL__MMIO_H_
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#define _INCLUDE__UTIL__MMIO_H_
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/* Genode includes */
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#include <util/register.h>
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namespace Genode { class Mmio; }
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/**
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* A continuous MMIO region
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*
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* For correct behavior of the member functions of 'Mmio', a class that
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* derives from one of the subclasses of 'Mmio' must not define members
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* named 'Register_base', 'Bitfield_base', 'Register_array_base' or
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* 'Array_bitfield_base'.
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*/
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class Genode::Mmio
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{
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/*
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* If set 0 verbosity isn't needed at all and the enum enables the
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* compiler to remove all verbosity code. If set 1 verbosity code
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* gets compiled and is then switched via '*_verbose' member variables.
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*/
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enum { VERBOSITY_AVAILABLE = 0 };
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/**
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* Proclaim a MMIO access
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*
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* \param _ACCESS_T integer type of access
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* \param dst access destination
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* \param v access value
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* \param w 1: write access 0: read access
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*/
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template <typename _ACCESS_T>
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inline void _access_verbosity(addr_t const dst, _ACCESS_T const v,
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bool const w) const
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{
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if (!VERBOSITY_AVAILABLE) return;
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if ((w && !_write_verbose) || (!w && !_read_verbose)) return;
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printf("mmio %s 0x%p: 0x", w ? "write" : "read ", (void *)dst);
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Trait::Uint_type<_ACCESS_T>::print_hex(v);
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printf("\n");
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}
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/**
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* Write '_ACCESS_T' typed 'value' to MMIO base + 'o'
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*/
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template <typename _ACCESS_T>
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inline void _write(off_t const o, _ACCESS_T const value)
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{
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addr_t const dst = (addr_t)base + o;
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_access_verbosity<_ACCESS_T>(dst, value, 1);
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*(_ACCESS_T volatile *)dst = value;
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}
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/**
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* Read '_ACCESS_T' typed from MMIO base + 'o'
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*/
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template <typename _ACCESS_T>
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inline _ACCESS_T _read(off_t const o) const
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{
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addr_t const dst = (addr_t)base + o;
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_ACCESS_T const value = *(_ACCESS_T volatile *)dst;
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_access_verbosity<_ACCESS_T>(dst, value, 0);
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return value;
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}
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protected:
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/*
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* If VERBOSITY_AVAILABLE is set MMIO isn't verbose by default.
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* Instead it causes this switches to be asked everytime MMIO
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* could be verbose. This way the user can either enable verbosity
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* locally by overwriting them in a deriving class or change their
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* initialization temporarily to enable verbosity globally and
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* then supress it locally by overwriting it.
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*/
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bool _write_verbose;
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bool _read_verbose;
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public:
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enum { BYTE_WIDTH_LOG2 = 3, BYTE_WIDTH = 1 << BYTE_WIDTH_LOG2 };
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/**
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* An integer like region within a MMIO region.
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*
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* \param _OFFSET Offset of the region relative to the
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* base of the compound MMIO.
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* \param _ACCESS_WIDTH Bit width of the region, for a list of
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* supported widths see 'Genode::Register'.
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* \param _STRICT_WRITE If set to 0, when writing a bitfield, we
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* read the register value, update the bits
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* on it, and write it back to the register.
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* If set to 1 we take an empty register
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* value instead, apply the bitfield on it,
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* and write it to the register. This can
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* be useful if you have registers that have
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* different means on reads and writes.
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*
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* For further details See 'Genode::Register'.
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*/
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template <off_t _OFFSET, unsigned long _ACCESS_WIDTH,
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bool _STRICT_WRITE = false>
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struct Register : public Genode::Register<_ACCESS_WIDTH>
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{
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enum {
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OFFSET = _OFFSET,
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ACCESS_WIDTH = _ACCESS_WIDTH,
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STRICT_WRITE = _STRICT_WRITE,
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};
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/*
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* GCC 4.4, in contrast to GCC versions >= 4.5, can't
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* select function templates like 'write(typename
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* T::Register::access_t value)' through a given 'T'
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* that, in this case, derives from 'Register<X, Y, Z>'.
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* It seems this is due to the fact that 'T::Register'
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* is a template. Thus we provide some kind of stamp
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* that solely must not be redefined by the deriving
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* class to ensure correct template selection.
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*/
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typedef Register<_OFFSET, _ACCESS_WIDTH, _STRICT_WRITE>
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Register_base;
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/**
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* A region within a register
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*
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* \param _SHIFT Bit shift of the first bit within the
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* compound register.
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* \param _WIDTH bit width of the region
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*
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* For details see 'Genode::Register::Bitfield'.
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*/
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template <unsigned long _SHIFT, unsigned long _WIDTH>
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struct Bitfield : public Genode::Register<ACCESS_WIDTH>::
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template Bitfield<_SHIFT, _WIDTH>
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{
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/* analogous to 'Mmio::Register::Register_base' */
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typedef Bitfield<_SHIFT, _WIDTH> Bitfield_base;
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/* back reference to containing register */
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typedef Register<_OFFSET, _ACCESS_WIDTH, _STRICT_WRITE>
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Compound_reg;
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};
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};
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/**
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* An array of successive equally structured regions, called items
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*
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* \param _OFFSET Offset of the first item relative to
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* the base of the compound MMIO.
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* \param _ACCESS_WIDTH Bit width of a single access, must be at
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* least the item width.
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* \param _ITEMS How many times the item gets iterated
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* successively.
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* \param _ITEM_WIDTH bit width of an item
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* \param _STRICT_WRITE If set to 0, when writing a bitfield, we
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* read the register value, update the bits
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* on it, and write it back to the register.
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* If set to 1, we take an empty register
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* value instead, apply the bitfield on it,
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* and write it to the register. This can
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* be useful if you have registers that have
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* different means on reads and writes.
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* Please note that ACCESS_WIDTH is decisive
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* for the range of such strictness.
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*
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* The array takes all inner structures, wich are covered by an
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* item width and iterates them successively. Such structures that
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* are partially exceed an item range are read and written also
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* partially. Structures that are completely out of the item range
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* are read as '0' and trying to overwrite them has no effect. The
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* array is not limited to its access width, it extends to the
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* memory region of its successive items. Trying to read out read
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* with an item index out of the array range returns '0', trying
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* to write to such indices has no effect.
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*/
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template <off_t _OFFSET, unsigned long _ACCESS_WIDTH,
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unsigned long _ITEMS, unsigned long _ITEM_WIDTH,
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bool _STRICT_WRITE = false>
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struct Register_array : public Register<_OFFSET, _ACCESS_WIDTH,
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_STRICT_WRITE>
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{
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typedef typename Trait::Uint_width<_ACCESS_WIDTH>::
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template Divisor<_ITEM_WIDTH> Item;
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enum {
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STRICT_WRITE = _STRICT_WRITE,
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OFFSET = _OFFSET,
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ACCESS_WIDTH = _ACCESS_WIDTH,
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ITEMS = _ITEMS,
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ITEM_WIDTH = _ITEM_WIDTH,
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ITEM_WIDTH_LOG2 = Item::WIDTH_LOG2,
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MAX_INDEX = ITEMS - 1,
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ITEM_MASK = (1ULL << ITEM_WIDTH) - 1,
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};
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/* analogous to 'Mmio::Register::Register_base' */
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typedef Register_array<OFFSET, ACCESS_WIDTH, ITEMS,
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ITEM_WIDTH, STRICT_WRITE>
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Register_array_base;
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typedef typename Register<OFFSET, ACCESS_WIDTH, STRICT_WRITE>::
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access_t access_t;
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/**
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* A bitregion within a register array item
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*
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* \param _SHIFT bit shift of the first bit within an item
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* \param _WIDTH bit width of the region
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*
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* For details see 'Genode::Register::Bitfield'.
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*/
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template <unsigned long _SHIFT, unsigned long _SIZE>
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struct Bitfield :
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public Register<OFFSET, ACCESS_WIDTH, STRICT_WRITE>::
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template Bitfield<_SHIFT, _SIZE>
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{
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/* analogous to 'Mmio::Register::Register_base' */
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typedef Bitfield<_SHIFT, _SIZE> Array_bitfield_base;
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/* back reference to containing register array */
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typedef Register_array<OFFSET, ACCESS_WIDTH, ITEMS,
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ITEM_WIDTH, STRICT_WRITE>
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Compound_array;
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};
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/**
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* Calculate destination of an array-item access
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*
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* \param offset Gets overridden with the offset of the
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* access type instance, that contains the
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* access destination, relative to the MMIO
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* base.
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* \param shift Gets overridden with the shift of the
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* destination within the access type instance
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* targeted by 'offset'.
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* \param index index of the targeted array item
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*/
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static inline void dst(off_t & offset,
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unsigned long & shift,
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unsigned long const index)
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{
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unsigned long const bit_off = index << ITEM_WIDTH_LOG2;
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offset = (off_t) ((bit_off >> BYTE_WIDTH_LOG2)
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& ~(sizeof(access_t)-1) );
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shift = bit_off - ( offset << BYTE_WIDTH_LOG2 );
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offset += OFFSET;
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}
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/**
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* Calc destination of a simple array-item access without shift
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*
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* \param offset gets overridden with the offset of the the
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* access destination, relative to the MMIO base
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* \param index index of the targeted array item
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*/
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static inline void simple_dst(off_t & offset,
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unsigned long const index)
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{
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offset = (index << ITEM_WIDTH_LOG2) >> BYTE_WIDTH_LOG2;
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offset += OFFSET;
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}
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};
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addr_t const base; /* base address of targeted MMIO region */
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/**
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* Constructor
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*
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* \param mmio_base base address of targeted MMIO region
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*/
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inline Mmio(addr_t mmio_base)
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: _write_verbose(0), _read_verbose(0), base(mmio_base) { }
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/*************************
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** Access to registers **
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*************************/
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/**
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* Get the address of the register 'T' typed as its access type
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*/
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template <typename T>
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inline typename T::Register_base::access_t volatile * typed_addr() const
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{
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typedef typename T::Register_base Register;
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typedef typename Register::access_t access_t;
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return (access_t volatile *)(base + Register::OFFSET);
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}
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/**
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* Read the register 'T'
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*/
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template <typename T>
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inline typename T::Register_base::access_t read() const
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{
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typedef typename T::Register_base Register;
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typedef typename Register::access_t access_t;
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return _read<access_t>(Register::OFFSET);
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}
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/**
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* Override the register 'T'
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*/
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template <typename T>
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inline void
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write(typename T::Register_base::access_t const value)
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{
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typedef typename T::Register_base Register;
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typedef typename Register::access_t access_t;
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_write<access_t>(Register::OFFSET, value);
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}
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/******************************************
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** Access to bitfields within registers **
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******************************************/
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/**
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* Read the bitfield 'T' of a register
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*/
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template <typename T>
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inline typename T::Bitfield_base::Compound_reg::access_t
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read() const
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{
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typedef typename T::Bitfield_base Bitfield;
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typedef typename Bitfield::Compound_reg Register;
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typedef typename Register::access_t access_t;
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return Bitfield::get(_read<access_t>(Register::OFFSET));
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}
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/**
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* Override to the bitfield 'T' of a register
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*
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* \param value value that shall be written
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*/
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template <typename T>
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inline void
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write(typename T::Bitfield_base::Compound_reg::access_t const value)
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{
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typedef typename T::Bitfield_base Bitfield;
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typedef typename Bitfield::Compound_reg Register;
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typedef typename Register::access_t access_t;
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/* initialize the pattern written finally to the register */
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access_t write_value;
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if (Register::STRICT_WRITE)
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{
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/* apply the bitfield to an empty write pattern */
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write_value = 0;
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} else {
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/* apply the bitfield to the old register value */
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write_value = read<Register>();
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Bitfield::clear(write_value);
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}
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/* apply bitfield value and override register */
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Bitfield::set(write_value, value);
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write<Register>(write_value);
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}
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/*******************************
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** Access to register arrays **
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*******************************/
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/**
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* Read an item of the register array 'T'
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*
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* \param index index of the targeted item
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*/
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template <typename T>
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inline typename T::Register_array_base::access_t
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read(unsigned long const index) const
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{
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typedef typename T::Register_array_base Array;
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typedef typename Array::access_t access_t;
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/* reads outside the array return 0 */
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if (index > Array::MAX_INDEX) return 0;
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/* if item width equals access width we optimize the access */
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off_t offset;
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if (Array::ITEM_WIDTH == Array::ACCESS_WIDTH) {
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Array::simple_dst(offset, index);
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return _read<access_t>(offset);
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/* access width and item width differ */
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} else {
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long unsigned shift;
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Array::dst(offset, shift, index);
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return (_read<access_t>(offset) >> shift) &
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Array::ITEM_MASK;
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}
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}
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/**
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* Override an item of the register array 'T'
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*
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* \param value value that shall be written
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* \param index index of the targeted item
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*/
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template <typename T>
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inline void
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write(typename T::Register_array_base::access_t const value,
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unsigned long const index)
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{
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typedef typename T::Register_array_base Array;
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typedef typename Array::access_t access_t;
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/* ignore writes outside the array */
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if (index > Array::MAX_INDEX) return;
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/* optimize the access if item width equals access width */
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off_t offset;
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if (Array::ITEM_WIDTH == Array::ACCESS_WIDTH) {
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Array::simple_dst(offset, index);
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_write<access_t>(offset, value);
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/* access width and item width differ */
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} else {
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long unsigned shift;
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Array::dst(offset, shift, index);
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/* insert new value into old register value */
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access_t write_value;
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if (Array::STRICT_WRITE)
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{
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/* apply bitfield to an empty write pattern */
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write_value = 0;
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} else {
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/* apply bitfield to the old register value */
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write_value = _read<access_t>(offset);
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write_value &= ~(Array::ITEM_MASK << shift);
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}
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/* apply bitfield value and override register */
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write_value |= (value & Array::ITEM_MASK) << shift;
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_write<access_t>(offset, write_value);
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}
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}
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/*****************************************************
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** Access to bitfields within register array items **
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*****************************************************/
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/**
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* Read the bitfield 'T' of a register array
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*
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* \param index index of the targeted item
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*/
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template <typename T>
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inline typename T::Array_bitfield_base::Compound_array::access_t
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read(unsigned long const index) const
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{
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typedef typename T::Array_bitfield_base Bitfield;
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typedef typename Bitfield::Compound_array Array;
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return Bitfield::get(read<Array>(index));
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}
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/**
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* Override the bitfield 'T' of a register array
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*
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* \param value value that shall be written
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* \param index index of the targeted array item
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*/
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template <typename T>
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inline void
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write(typename T::Array_bitfield_base::Compound_array::access_t const value,
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long unsigned const index)
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{
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typedef typename T::Array_bitfield_base Bitfield;
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typedef typename Bitfield::Compound_array Array;
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typedef typename Array::access_t access_t;
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/* initialize the pattern written finally to the register */
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access_t write_value;
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if (Array::STRICT_WRITE)
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{
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/* apply the bitfield to an empty write pattern */
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write_value = 0;
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} else {
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/* apply the bitfield to the old register value */
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write_value = read<Array>(index);
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Bitfield::clear(write_value);
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}
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/* apply bitfield value and override register */
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Bitfield::set(write_value, value);
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write<Array>(write_value, index);
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}
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/***********************
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** Access to bitsets **
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***********************/
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/**
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* Read bitset 'T' (composed of 2 parts)
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*/
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template <typename T>
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inline typename T::Bitset_2_base::access_t const read()
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{
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typedef typename T::Bitset_2_base::Bits_0 Bits_0;
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typedef typename T::Bitset_2_base::Bits_1 Bits_1;
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typedef typename T::Bitset_2_base::access_t access_t;
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enum { V1_SHIFT = Bits_0::BITFIELD_WIDTH };
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access_t const v0 = read<Bits_0>();
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access_t const v1 = read<Bits_1>();
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return v0 | (v1 << V1_SHIFT);
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}
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/**
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* Override bitset 'T' (composed of 2 parts)
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*
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* \param v value that shall be written
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*/
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template <typename T>
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inline void write(typename T::Bitset_2_base::access_t v)
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{
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typedef typename T::Bitset_2_base::Bits_0 Bits_0;
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typedef typename T::Bitset_2_base::Bits_1 Bits_1;
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write<Bits_0>(v);
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write<Bits_1>(v >> Bits_0::BITFIELD_WIDTH);
|
|
}
|
|
|
|
/**
|
|
* Read bitset 'T' (composed of 3 parts)
|
|
*/
|
|
template <typename T>
|
|
inline typename T::Bitset_3_base::access_t const read()
|
|
{
|
|
typedef typename T::Bitset_3_base::Bits_0 Bits_0;
|
|
typedef typename T::Bitset_3_base::Bits_1 Bits_1;
|
|
typedef typename T::Bitset_3_base::Bits_2 Bits_2;
|
|
typedef typename T::Bitset_3_base::access_t access_t;
|
|
enum {
|
|
BITS_0_WIDTH = Bits_0::BITFIELD_WIDTH,
|
|
BITS_1_WIDTH = Bits_1::BITFIELD_WIDTH,
|
|
V1_SHIFT = BITS_0_WIDTH + BITS_1_WIDTH,
|
|
};
|
|
access_t const v0 = read<Bitset_2<Bits_0, Bits_1> >();
|
|
access_t const v1 = read<Bits_2>();
|
|
return v0 | (v1 << V1_SHIFT);
|
|
}
|
|
|
|
/**
|
|
* Override bitset 'T' (composed of 3 parts)
|
|
*
|
|
* \param v value that shall be written
|
|
*/
|
|
template <typename T>
|
|
inline void write(typename T::Bitset_3_base::access_t v)
|
|
{
|
|
typedef typename T::Bitset_3_base::Bits_0 Bits_0;
|
|
typedef typename T::Bitset_3_base::Bits_1 Bits_1;
|
|
typedef typename T::Bitset_3_base::Bits_2 Bits_2;
|
|
write<Bitset_2<Bits_0, Bits_1> >(v);
|
|
write<Bits_2>(v >> (Bits_0::BITFIELD_WIDTH +
|
|
Bits_1::BITFIELD_WIDTH));
|
|
}
|
|
|
|
|
|
/*********************************
|
|
** Polling for bitfield states **
|
|
*********************************/
|
|
|
|
/**
|
|
* Interface for delaying the execution of a calling thread
|
|
*/
|
|
struct Delayer
|
|
{
|
|
/**
|
|
* Delay execution of the caller for 'us' microseconds
|
|
*/
|
|
virtual void usleep(unsigned us) = 0;
|
|
};
|
|
|
|
/**
|
|
* Wait until register 'T' contains the specified 'value'
|
|
*
|
|
* \param value value to wait for
|
|
* \param delayer sleeping facility to be used when the
|
|
* value is not reached yet
|
|
* \param max_attempts number of register probing attempts
|
|
* \param us number of microseconds between attempts
|
|
*/
|
|
template <typename T>
|
|
inline bool
|
|
wait_for(typename T::Register_base::access_t const value,
|
|
Delayer & delayer,
|
|
unsigned max_attempts = 500,
|
|
unsigned us = 1000)
|
|
{
|
|
typedef typename T::Register_base Register;
|
|
for (unsigned i = 0; i < max_attempts; i++, delayer.usleep(us))
|
|
{
|
|
if (read<Register>() == value) return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Wait until bitfield 'T' contains the specified 'value'
|
|
*
|
|
* \param value value to wait for
|
|
* \param delayer sleeping facility to be used when the
|
|
* value is not reached yet
|
|
* \param max_attempts number of bitfield probing attempts
|
|
* \param us number of microseconds between attempts
|
|
*/
|
|
template <typename T>
|
|
inline bool
|
|
wait_for(typename T::Bitfield_base::Compound_reg::access_t const value,
|
|
Delayer & delayer,
|
|
unsigned max_attempts = 500,
|
|
unsigned us = 1000)
|
|
{
|
|
typedef typename T::Bitfield_base Bitfield;
|
|
for (unsigned i = 0; i < max_attempts; i++, delayer.usleep(us))
|
|
{
|
|
if (read<Bitfield>() == value) return true;
|
|
}
|
|
return false;
|
|
}
|
|
};
|
|
|
|
#endif /* _INCLUDE__UTIL__MMIO_H_ */
|
|
|