patch-2.0.35 linux/drivers/net/soundmodem/smdma.h

• Lines: 218
• Date: Mon Jul 13 13:47:31 1998
• Orig file: v2.0.34/linux/drivers/net/soundmodem/smdma.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.0.34/linux/drivers/net/soundmodem/smdma.h linux/drivers/net/soundmodem/smdma.h
@@ -0,0 +1,217 @@
+/*****************************************************************************/
+
+/*
+ *	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 */
+
+
+