mirror of https://gitee.com/openkylin/linux.git
206 lines
5.9 KiB
C
206 lines
5.9 KiB
C
/******************************************************************************
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*
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* Copyright(c) 2003 - 2008 Intel Corporation. All rights reserved.
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*
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* Portions of this file are derived from the ipw3945 project, as well
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* as portions of the ieee80211 subsystem header files.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of version 2 of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110, USA
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*
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* The full GNU General Public License is included in this distribution in the
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* file called LICENSE.
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*
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* Contact Information:
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* James P. Ketrenos <ipw2100-admin@linux.intel.com>
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*
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*****************************************************************************/
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#ifndef __iwl_helpers_h__
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#define __iwl_helpers_h__
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#include <linux/ctype.h>
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/*
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* The structures defined by the hardware/uCode interface
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* have bit-wise operations. For each bit-field there is
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* a data symbol in the structure, the start bit position
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* and the length of the bit-field.
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*
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* iwl_get_bits and iwl_set_bits will return or set the
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* appropriate bits on a 32-bit value.
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*
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* IWL_GET_BITS and IWL_SET_BITS use symbol expansion to
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* expand out to the appropriate call to iwl_get_bits
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* and iwl_set_bits without having to reference all of the
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* numerical constants and defines provided in the hardware
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* definition
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*/
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/**
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* iwl_get_bits - Extract a hardware bit-field value
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* @src: source hardware value (__le32)
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* @pos: bit-position (0-based) of first bit of value
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* @len: length of bit-field
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*
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* iwl_get_bits will return the bit-field in cpu endian ordering.
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*
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* NOTE: If used from IWL_GET_BITS then pos and len are compile-constants and
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* will collapse to minimal code by the compiler.
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*/
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static inline u32 iwl_get_bits(__le32 src, u8 pos, u8 len)
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{
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u32 tmp = le32_to_cpu(src);
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tmp >>= pos;
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tmp &= (1UL << len) - 1;
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return tmp;
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}
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/**
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* iwl_set_bits - Set a hardware bit-field value
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* @dst: Address of __le32 hardware value
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* @pos: bit-position (0-based) of first bit of value
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* @len: length of bit-field
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* @val: cpu endian value to encode into the bit-field
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*
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* iwl_set_bits will encode val into dst, masked to be len bits long at bit
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* position pos.
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*
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* NOTE: If used IWL_SET_BITS pos and len will be compile-constants and
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* will collapse to minimal code by the compiler.
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*/
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static inline void iwl_set_bits(__le32 *dst, u8 pos, u8 len, int val)
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{
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u32 tmp = le32_to_cpu(*dst);
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tmp &= ~(((1UL << len) - 1) << pos);
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tmp |= (val & ((1UL << len) - 1)) << pos;
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*dst = cpu_to_le32(tmp);
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}
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static inline void iwl_set_bits16(__le16 *dst, u8 pos, u8 len, int val)
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{
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u16 tmp = le16_to_cpu(*dst);
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tmp &= ~((1UL << (pos + len)) - (1UL << pos));
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tmp |= (val & ((1UL << len) - 1)) << pos;
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*dst = cpu_to_le16(tmp);
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}
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/*
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* The bit-field definitions in iwl-xxxx-hw.h are in the form of:
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*
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* struct example {
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* __le32 val1;
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* #define IWL_name_POS 8
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* #define IWL_name_LEN 4
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* #define IWL_name_SYM val1
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* };
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*
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* The IWL_SET_BITS and IWL_GET_BITS macros are provided to allow the driver
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* to call:
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*
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* struct example bar;
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* u32 val = IWL_GET_BITS(bar, name);
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* val = val * 2;
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* IWL_SET_BITS(bar, name, val);
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*
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* All cpu / host ordering, masking, and shifts are performed by the macros
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* and iwl_{get,set}_bits.
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*
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*/
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#define IWL_SET_BITS(s, sym, v) \
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iwl_set_bits(&(s).IWL_ ## sym ## _SYM, IWL_ ## sym ## _POS, \
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IWL_ ## sym ## _LEN, (v))
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#define IWL_SET_BITS16(s, sym, v) \
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iwl_set_bits16(&(s).IWL_ ## sym ## _SYM, IWL_ ## sym ## _POS, \
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IWL_ ## sym ## _LEN, (v))
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#define IWL_GET_BITS(s, sym) \
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iwl_get_bits((s).IWL_ ## sym ## _SYM, IWL_ ## sym ## _POS, \
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IWL_ ## sym ## _LEN)
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#define KELVIN_TO_CELSIUS(x) ((x)-273)
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#define CELSIUS_TO_KELVIN(x) ((x)+273)
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#define IWL_MASK(lo, hi) ((1 << (hi)) | ((1 << (hi)) - (1 << (lo))))
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static inline struct ieee80211_conf *ieee80211_get_hw_conf(
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struct ieee80211_hw *hw)
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{
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return &hw->conf;
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}
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static inline int iwl_check_bits(unsigned long field, unsigned long mask)
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{
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return ((field & mask) == mask) ? 1 : 0;
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}
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static inline unsigned long elapsed_jiffies(unsigned long start,
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unsigned long end)
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{
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if (end >= start)
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return end - start;
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return end + (MAX_JIFFY_OFFSET - start) + 1;
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}
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static inline u8 iwl_get_dma_hi_address(dma_addr_t addr)
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{
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return sizeof(addr) > sizeof(u32) ? (addr >> 16) >> 16 : 0;
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}
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/**
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* iwl_queue_inc_wrap - increment queue index, wrap back to beginning
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* @index -- current index
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* @n_bd -- total number of entries in queue (must be power of 2)
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*/
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static inline int iwl_queue_inc_wrap(int index, int n_bd)
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{
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return ++index & (n_bd - 1);
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}
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/**
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* iwl_queue_dec_wrap - decrement queue index, wrap back to end
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* @index -- current index
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* @n_bd -- total number of entries in queue (must be power of 2)
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*/
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static inline int iwl_queue_dec_wrap(int index, int n_bd)
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{
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return --index & (n_bd - 1);
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}
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/* TODO: Move fw_desc functions to iwl-pci.ko */
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static inline void iwl_free_fw_desc(struct pci_dev *pci_dev,
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struct fw_desc *desc)
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{
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if (desc->v_addr)
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pci_free_consistent(pci_dev, desc->len,
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desc->v_addr, desc->p_addr);
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desc->v_addr = NULL;
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desc->len = 0;
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}
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static inline int iwl_alloc_fw_desc(struct pci_dev *pci_dev,
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struct fw_desc *desc)
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{
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desc->v_addr = pci_alloc_consistent(pci_dev, desc->len, &desc->p_addr);
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return (desc->v_addr != NULL) ? 0 : -ENOMEM;
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}
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#endif /* __iwl_helpers_h__ */
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