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author | 2015-08-04 12:17:53 -0700 | |
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committer | 2015-08-04 15:44:42 -0700 | |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/drivers/misc/echo/fir.h | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/drivers/misc/echo/fir.h')
-rw-r--r-- | kernel/drivers/misc/echo/fir.h | 216 |
1 files changed, 216 insertions, 0 deletions
diff --git a/kernel/drivers/misc/echo/fir.h b/kernel/drivers/misc/echo/fir.h new file mode 100644 index 000000000..7b9fabf1f --- /dev/null +++ b/kernel/drivers/misc/echo/fir.h @@ -0,0 +1,216 @@ +/* + * SpanDSP - a series of DSP components for telephony + * + * fir.h - General telephony FIR routines + * + * Written by Steve Underwood <steveu@coppice.org> + * + * Copyright (C) 2002 Steve Underwood + * + * All rights reserved. + * + * 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. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + */ + +#if !defined(_FIR_H_) +#define _FIR_H_ + +/* + Blackfin NOTES & IDEAS: + + A simple dot product function is used to implement the filter. This performs + just one MAC/cycle which is inefficient but was easy to implement as a first + pass. The current Blackfin code also uses an unrolled form of the filter + history to avoid 0 length hardware loop issues. This is wasteful of + memory. + + Ideas for improvement: + + 1/ Rewrite filter for dual MAC inner loop. The issue here is handling + history sample offsets that are 16 bit aligned - the dual MAC needs + 32 bit aligmnent. There are some good examples in libbfdsp. + + 2/ Use the hardware circular buffer facility tohalve memory usage. + + 3/ Consider using internal memory. + + Using less memory might also improve speed as cache misses will be + reduced. A drop in MIPs and memory approaching 50% should be + possible. + + The foreground and background filters currenlty use a total of + about 10 MIPs/ch as measured with speedtest.c on a 256 TAP echo + can. +*/ + +/* + * 16 bit integer FIR descriptor. This defines the working state for a single + * instance of an FIR filter using 16 bit integer coefficients. + */ +struct fir16_state_t { + int taps; + int curr_pos; + const int16_t *coeffs; + int16_t *history; +}; + +/* + * 32 bit integer FIR descriptor. This defines the working state for a single + * instance of an FIR filter using 32 bit integer coefficients, and filtering + * 16 bit integer data. + */ +struct fir32_state_t { + int taps; + int curr_pos; + const int32_t *coeffs; + int16_t *history; +}; + +/* + * Floating point FIR descriptor. This defines the working state for a single + * instance of an FIR filter using floating point coefficients and data. + */ +struct fir_float_state_t { + int taps; + int curr_pos; + const float *coeffs; + float *history; +}; + +static inline const int16_t *fir16_create(struct fir16_state_t *fir, + const int16_t *coeffs, int taps) +{ + fir->taps = taps; + fir->curr_pos = taps - 1; + fir->coeffs = coeffs; +#if defined(__bfin__) + fir->history = kcalloc(2 * taps, sizeof(int16_t), GFP_KERNEL); +#else + fir->history = kcalloc(taps, sizeof(int16_t), GFP_KERNEL); +#endif + return fir->history; +} + +static inline void fir16_flush(struct fir16_state_t *fir) +{ +#if defined(__bfin__) + memset(fir->history, 0, 2 * fir->taps * sizeof(int16_t)); +#else + memset(fir->history, 0, fir->taps * sizeof(int16_t)); +#endif +} + +static inline void fir16_free(struct fir16_state_t *fir) +{ + kfree(fir->history); +} + +#ifdef __bfin__ +static inline int32_t dot_asm(short *x, short *y, int len) +{ + int dot; + + len--; + + __asm__("I0 = %1;\n\t" + "I1 = %2;\n\t" + "A0 = 0;\n\t" + "R0.L = W[I0++] || R1.L = W[I1++];\n\t" + "LOOP dot%= LC0 = %3;\n\t" + "LOOP_BEGIN dot%=;\n\t" + "A0 += R0.L * R1.L (IS) || R0.L = W[I0++] || R1.L = W[I1++];\n\t" + "LOOP_END dot%=;\n\t" + "A0 += R0.L*R1.L (IS);\n\t" + "R0 = A0;\n\t" + "%0 = R0;\n\t" + : "=&d"(dot) + : "a"(x), "a"(y), "a"(len) + : "I0", "I1", "A1", "A0", "R0", "R1" + ); + + return dot; +} +#endif + +static inline int16_t fir16(struct fir16_state_t *fir, int16_t sample) +{ + int32_t y; +#if defined(__bfin__) + fir->history[fir->curr_pos] = sample; + fir->history[fir->curr_pos + fir->taps] = sample; + y = dot_asm((int16_t *) fir->coeffs, &fir->history[fir->curr_pos], + fir->taps); +#else + int i; + int offset1; + int offset2; + + fir->history[fir->curr_pos] = sample; + + offset2 = fir->curr_pos; + offset1 = fir->taps - offset2; + y = 0; + for (i = fir->taps - 1; i >= offset1; i--) + y += fir->coeffs[i] * fir->history[i - offset1]; + for (; i >= 0; i--) + y += fir->coeffs[i] * fir->history[i + offset2]; +#endif + if (fir->curr_pos <= 0) + fir->curr_pos = fir->taps; + fir->curr_pos--; + return (int16_t) (y >> 15); +} + +static inline const int16_t *fir32_create(struct fir32_state_t *fir, + const int32_t *coeffs, int taps) +{ + fir->taps = taps; + fir->curr_pos = taps - 1; + fir->coeffs = coeffs; + fir->history = kcalloc(taps, sizeof(int16_t), GFP_KERNEL); + return fir->history; +} + +static inline void fir32_flush(struct fir32_state_t *fir) +{ + memset(fir->history, 0, fir->taps * sizeof(int16_t)); +} + +static inline void fir32_free(struct fir32_state_t *fir) +{ + kfree(fir->history); +} + +static inline int16_t fir32(struct fir32_state_t *fir, int16_t sample) +{ + int i; + int32_t y; + int offset1; + int offset2; + + fir->history[fir->curr_pos] = sample; + offset2 = fir->curr_pos; + offset1 = fir->taps - offset2; + y = 0; + for (i = fir->taps - 1; i >= offset1; i--) + y += fir->coeffs[i] * fir->history[i - offset1]; + for (; i >= 0; i--) + y += fir->coeffs[i] * fir->history[i + offset2]; + if (fir->curr_pos <= 0) + fir->curr_pos = fir->taps; + fir->curr_pos--; + return (int16_t) (y >> 15); +} + +#endif |