diff options
Diffstat (limited to 'drivers/staging/brcm80211/brcmsmac/phy/wlc_phy_qmath.c')
| -rw-r--r-- | drivers/staging/brcm80211/brcmsmac/phy/wlc_phy_qmath.c | 296 |
1 files changed, 0 insertions, 296 deletions
diff --git a/drivers/staging/brcm80211/brcmsmac/phy/wlc_phy_qmath.c b/drivers/staging/brcm80211/brcmsmac/phy/wlc_phy_qmath.c deleted file mode 100644 index c98176fd0aae..000000000000 --- a/drivers/staging/brcm80211/brcmsmac/phy/wlc_phy_qmath.c +++ /dev/null @@ -1,296 +0,0 @@ -/* - * Copyright (c) 2010 Broadcom Corporation - * - * Permission to use, copy, modify, and/or distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES - * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY - * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION - * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN - * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. - */ - -#include <linux/types.h> - -#include "wlc_phy_qmath.h" - -/* -Description: This function make 16 bit unsigned multiplication. To fit the output into -16 bits the 32 bit multiplication result is right shifted by 16 bits. -*/ -u16 qm_mulu16(u16 op1, u16 op2) -{ - return (u16) (((u32) op1 * (u32) op2) >> 16); -} - -/* -Description: This function make 16 bit multiplication and return the result in 16 bits. -To fit the multiplication result into 16 bits the multiplication result is right shifted by -15 bits. Right shifting 15 bits instead of 16 bits is done to remove the extra sign bit formed -due to the multiplication. -When both the 16bit inputs are 0x8000 then the output is saturated to 0x7fffffff. -*/ -s16 qm_muls16(s16 op1, s16 op2) -{ - s32 result; - if (op1 == (s16) 0x8000 && op2 == (s16) 0x8000) { - result = 0x7fffffff; - } else { - result = ((s32) (op1) * (s32) (op2)); - } - return (s16) (result >> 15); -} - -/* -Description: This function add two 32 bit numbers and return the 32bit result. -If the result overflow 32 bits, the output will be saturated to 32bits. -*/ -s32 qm_add32(s32 op1, s32 op2) -{ - s32 result; - result = op1 + op2; - if (op1 < 0 && op2 < 0 && result > 0) { - result = 0x80000000; - } else if (op1 > 0 && op2 > 0 && result < 0) { - result = 0x7fffffff; - } - return result; -} - -/* -Description: This function add two 16 bit numbers and return the 16bit result. -If the result overflow 16 bits, the output will be saturated to 16bits. -*/ -s16 qm_add16(s16 op1, s16 op2) -{ - s16 result; - s32 temp = (s32) op1 + (s32) op2; - if (temp > (s32) 0x7fff) { - result = (s16) 0x7fff; - } else if (temp < (s32) 0xffff8000) { - result = (s16) 0xffff8000; - } else { - result = (s16) temp; - } - return result; -} - -/* -Description: This function make 16 bit subtraction and return the 16bit result. -If the result overflow 16 bits, the output will be saturated to 16bits. -*/ -s16 qm_sub16(s16 op1, s16 op2) -{ - s16 result; - s32 temp = (s32) op1 - (s32) op2; - if (temp > (s32) 0x7fff) { - result = (s16) 0x7fff; - } else if (temp < (s32) 0xffff8000) { - result = (s16) 0xffff8000; - } else { - result = (s16) temp; - } - return result; -} - -/* -Description: This function make a 32 bit saturated left shift when the specified shift -is +ve. This function will make a 32 bit right shift when the specified shift is -ve. -This function return the result after shifting operation. -*/ -s32 qm_shl32(s32 op, int shift) -{ - int i; - s32 result; - result = op; - if (shift > 31) - shift = 31; - else if (shift < -31) - shift = -31; - if (shift >= 0) { - for (i = 0; i < shift; i++) { - result = qm_add32(result, result); - } - } else { - result = result >> (-shift); - } - return result; -} - -/* -Description: This function make a 16 bit saturated left shift when the specified shift -is +ve. This function will make a 16 bit right shift when the specified shift is -ve. -This function return the result after shifting operation. -*/ -s16 qm_shl16(s16 op, int shift) -{ - int i; - s16 result; - result = op; - if (shift > 15) - shift = 15; - else if (shift < -15) - shift = -15; - if (shift > 0) { - for (i = 0; i < shift; i++) { - result = qm_add16(result, result); - } - } else { - result = result >> (-shift); - } - return result; -} - -/* -Description: This function make a 16 bit right shift when shift is +ve. -This function make a 16 bit saturated left shift when shift is -ve. This function -return the result of the shift operation. -*/ -s16 qm_shr16(s16 op, int shift) -{ - return qm_shl16(op, -shift); -} - -/* -Description: This function return the number of redundant sign bits in a 32 bit number. -Example: qm_norm32(0x00000080) = 23 -*/ -s16 qm_norm32(s32 op) -{ - u16 u16extraSignBits; - if (op == 0) { - return 31; - } else { - u16extraSignBits = 0; - while ((op >> 31) == (op >> 30)) { - u16extraSignBits++; - op = op << 1; - } - } - return u16extraSignBits; -} - -/* This table is log2(1+(i/32)) where i=[0:1:31], in q.15 format */ -static const s16 log_table[] = { - 0, - 1455, - 2866, - 4236, - 5568, - 6863, - 8124, - 9352, - 10549, - 11716, - 12855, - 13968, - 15055, - 16117, - 17156, - 18173, - 19168, - 20143, - 21098, - 22034, - 22952, - 23852, - 24736, - 25604, - 26455, - 27292, - 28114, - 28922, - 29717, - 30498, - 31267, - 32024 -}; - -#define LOG_TABLE_SIZE 32 /* log_table size */ -#define LOG2_LOG_TABLE_SIZE 5 /* log2(log_table size) */ -#define Q_LOG_TABLE 15 /* qformat of log_table */ -#define LOG10_2 19728 /* log10(2) in q.16 */ - -/* -Description: -This routine takes the input number N and its q format qN and compute -the log10(N). This routine first normalizes the input no N. Then N is in mag*(2^x) format. -mag is any number in the range 2^30-(2^31 - 1). Then log2(mag * 2^x) = log2(mag) + x is computed. -From that log10(mag * 2^x) = log2(mag * 2^x) * log10(2) is computed. -This routine looks the log2 value in the table considering LOG2_LOG_TABLE_SIZE+1 MSBs. -As the MSB is always 1, only next LOG2_OF_LOG_TABLE_SIZE MSBs are used for table lookup. -Next 16 MSBs are used for interpolation. -Inputs: -N - number to which log10 has to be found. -qN - q format of N -log10N - address where log10(N) will be written. -qLog10N - address where log10N qformat will be written. -Note/Problem: -For accurate results input should be in normalized or near normalized form. -*/ -void qm_log10(s32 N, s16 qN, s16 *log10N, s16 *qLog10N) -{ - s16 s16norm, s16tableIndex, s16errorApproximation; - u16 u16offset; - s32 s32log; - - /* normalize the N. */ - s16norm = qm_norm32(N); - N = N << s16norm; - - /* The qformat of N after normalization. - * -30 is added to treat the no as between 1.0 to 2.0 - * i.e. after adding the -30 to the qformat the decimal point will be - * just rigtht of the MSB. (i.e. after sign bit and 1st MSB). i.e. - * at the right side of 30th bit. - */ - qN = qN + s16norm - 30; - - /* take the table index as the LOG2_OF_LOG_TABLE_SIZE bits right of the MSB */ - s16tableIndex = (s16) (N >> (32 - (2 + LOG2_LOG_TABLE_SIZE))); - - /* remove the MSB. the MSB is always 1 after normalization. */ - s16tableIndex = - s16tableIndex & (s16) ((1 << LOG2_LOG_TABLE_SIZE) - 1); - - /* remove the (1+LOG2_OF_LOG_TABLE_SIZE) MSBs in the N. */ - N = N & ((1 << (32 - (2 + LOG2_LOG_TABLE_SIZE))) - 1); - - /* take the offset as the 16 MSBS after table index. - */ - u16offset = (u16) (N >> (32 - (2 + LOG2_LOG_TABLE_SIZE + 16))); - - /* look the log value in the table. */ - s32log = log_table[s16tableIndex]; /* q.15 format */ - - /* interpolate using the offset. */ - s16errorApproximation = (s16) qm_mulu16(u16offset, (u16) (log_table[s16tableIndex + 1] - log_table[s16tableIndex])); /* q.15 */ - - s32log = qm_add16((s16) s32log, s16errorApproximation); /* q.15 format */ - - /* adjust for the qformat of the N as - * log2(mag * 2^x) = log2(mag) + x - */ - s32log = qm_add32(s32log, ((s32) -qN) << 15); /* q.15 format */ - - /* normalize the result. */ - s16norm = qm_norm32(s32log); - - /* bring all the important bits into lower 16 bits */ - s32log = qm_shl32(s32log, s16norm - 16); /* q.15+s16norm-16 format */ - - /* compute the log10(N) by multiplying log2(N) with log10(2). - * as log10(mag * 2^x) = log2(mag * 2^x) * log10(2) - * log10N in q.15+s16norm-16+1 (LOG10_2 is in q.16) - */ - *log10N = qm_muls16((s16) s32log, (s16) LOG10_2); - - /* write the q format of the result. */ - *qLog10N = 15 + s16norm - 16 + 1; - - return; -} |