URL
https://opencores.org/ocsvn/or1k/or1k/trunk
Subversion Repositories or1k
[/] [or1k/] [tags/] [before_ORP/] [uclinux/] [uClinux-2.0.x/] [drivers/] [net/] [soundmodem/] [smdma.h] - Rev 901
Go to most recent revision | Compare with Previous | Blame | View Log
/*****************************************************************************/ /* * smdma.h -- soundcard radio modem driver dma buffer routines. * * Copyright (C) 1996 Thomas Sailer (sailer@ife.ee.ethz.ch) * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * 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. * * Please note that the GPL allows you to use the driver, NOT the radio. * In order to use the radio, you need a license from the communications * authority of your country. * */ #ifndef _SMDMA_H #define _SMDMA_H /* ---------------------------------------------------------------------- */ #include "sm.h" /* ---------------------------------------------------------------------- */ #define DMA_MODE_AUTOINIT 0x10 #define NUM_FRAGMENTS 4 /* * NOTE: make sure that hdlcdrv_hdlcbuffer contains enough space * for the modulator to fill the whole DMA buffer without underrun * at the highest possible baud rate, otherwise the TX state machine will * not work correctly. That is (9k6 FSK): HDLCDRV_HDLCBUFFER > 6*NUM_FRAGMENTS */ /* --------------------------------------------------------------------- */ /* * ===================== DMA buffer management =========================== */ /* * returns the number of samples per fragment */ extern __inline__ unsigned int dma_setup(struct sm_state *sm, int send, unsigned int dmanr) { if (send) { disable_dma(dmanr); clear_dma_ff(dmanr); set_dma_mode(dmanr, DMA_MODE_WRITE | DMA_MODE_AUTOINIT); set_dma_addr(dmanr, virt_to_bus(sm->dma.obuf)); set_dma_count(dmanr, sm->dma.ofragsz * NUM_FRAGMENTS); enable_dma(dmanr); if (sm->dma.o16bit) return sm->dma.ofragsz/2; return sm->dma.ofragsz; } else { disable_dma(dmanr); clear_dma_ff(dmanr); set_dma_mode(dmanr, DMA_MODE_READ | DMA_MODE_AUTOINIT); set_dma_addr(dmanr, virt_to_bus(sm->dma.ibuf)); set_dma_count(dmanr, sm->dma.ifragsz * NUM_FRAGMENTS); enable_dma(dmanr); if (sm->dma.i16bit) return sm->dma.ifragsz/2; return sm->dma.ifragsz; } } /* --------------------------------------------------------------------- */ extern __inline__ unsigned int dma_ptr(struct sm_state *sm, int send, unsigned int dmanr, unsigned int *curfrag) { unsigned int dmaptr, sz, frg, offs; dmaptr = get_dma_residue(dmanr); if (send) { sz = sm->dma.ofragsz * NUM_FRAGMENTS; if (dmaptr == 0 || dmaptr > sz) dmaptr = sz; dmaptr--; frg = dmaptr / sm->dma.ofragsz; offs = (dmaptr % sm->dma.ofragsz) + 1; *curfrag = NUM_FRAGMENTS - 1 - frg; #ifdef SM_DEBUG if (!sm->debug_vals.dma_residue || offs < sm->debug_vals.dma_residue) sm->debug_vals.dma_residue = offs; #endif /* SM_DEBUG */ if (sm->dma.o16bit) return offs/2; return offs; } else { sz = sm->dma.ifragsz * NUM_FRAGMENTS; if (dmaptr == 0 || dmaptr > sz) dmaptr = sz; dmaptr--; frg = dmaptr / sm->dma.ifragsz; offs = (dmaptr % sm->dma.ifragsz) + 1; *curfrag = NUM_FRAGMENTS - 1 - frg; #ifdef SM_DEBUG if (!sm->debug_vals.dma_residue || offs < sm->debug_vals.dma_residue) sm->debug_vals.dma_residue = offs; #endif /* SM_DEBUG */ if (sm->dma.i16bit) return offs/2; return offs; } } /* --------------------------------------------------------------------- */ extern __inline__ int dma_end_transmit(struct sm_state *sm, unsigned int curfrag) { unsigned int diff = (NUM_FRAGMENTS + curfrag - sm->dma.ofragptr) % NUM_FRAGMENTS; sm->dma.ofragptr = curfrag; if (sm->dma.ptt_cnt <= 0) { sm->dma.ptt_cnt = 0; return 0; } sm->dma.ptt_cnt -= diff; if (sm->dma.ptt_cnt <= 0) { sm->dma.ptt_cnt = 0; return -1; } return 0; } extern __inline__ void dma_transmit(struct sm_state *sm) { void *p; while (sm->dma.ptt_cnt < NUM_FRAGMENTS && hdlcdrv_ptt(&sm->hdrv)) { p = (unsigned char *)sm->dma.obuf + sm->dma.ofragsz * ((sm->dma.ofragptr + sm->dma.ptt_cnt) % NUM_FRAGMENTS); if (sm->dma.o16bit) { time_exec(sm->debug_vals.mod_cyc, sm->mode_tx->modulator_s16(sm, p, sm->dma.ofragsz/2)); } else { time_exec(sm->debug_vals.mod_cyc, sm->mode_tx->modulator_u8(sm, p, sm->dma.ofragsz)); } sm->dma.ptt_cnt++; } } extern __inline__ void dma_init_transmit(struct sm_state *sm) { sm->dma.ofragptr = 0; sm->dma.ptt_cnt = 0; } extern __inline__ void dma_start_transmit(struct sm_state *sm) { sm->dma.ofragptr = 0; if (sm->dma.o16bit) { time_exec(sm->debug_vals.mod_cyc, sm->mode_tx->modulator_s16(sm, sm->dma.obuf, sm->dma.ofragsz/2)); } else { time_exec(sm->debug_vals.mod_cyc, sm->mode_tx->modulator_u8(sm, sm->dma.obuf, sm->dma.ofragsz)); } sm->dma.ptt_cnt = 1; } extern __inline__ void dma_clear_transmit(struct sm_state *sm) { sm->dma.ptt_cnt = 0; memset(sm->dma.obuf, (sm->dma.o16bit) ? 0 : 0x80, sm->dma.ofragsz * NUM_FRAGMENTS); } /* --------------------------------------------------------------------- */ extern __inline__ void dma_receive(struct sm_state *sm, unsigned int curfrag) { void *p; while (sm->dma.ifragptr != curfrag) { if (sm->dma.ifragptr) p = (unsigned char *)sm->dma.ibuf + sm->dma.ifragsz * sm->dma.ifragptr; else { p = (unsigned char *)sm->dma.ibuf + NUM_FRAGMENTS * sm->dma.ifragsz; memcpy(p, sm->dma.ibuf, sm->dma.ifragsz); } if (sm->dma.o16bit) { time_exec(sm->debug_vals.demod_cyc, sm->mode_rx->demodulator_s16(sm, p, sm->dma.ifragsz/2)); } else { time_exec(sm->debug_vals.demod_cyc, sm->mode_rx->demodulator_u8(sm, p, sm->dma.ifragsz)); } sm->dma.ifragptr = (sm->dma.ifragptr + 1) % NUM_FRAGMENTS; } } extern __inline__ void dma_init_receive(struct sm_state *sm) { sm->dma.ifragptr = 0; } /* --------------------------------------------------------------------- */ #endif /* _SMDMA_H */
Go to most recent revision | Compare with Previous | Blame | View Log