dc07c79263
Unify this optimized dbop transfer function and re-use it more often (it still handles 16bit transfers). git-svn-id: svn://svn.rockbox.org/rockbox/trunk@24198 a1c6a512-1295-4272-9138-f99709370657
125 lines
4 KiB
C
125 lines
4 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2009 by Bertrik Sikken
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "config.h"
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#include <inttypes.h>
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#include "as3525.h"
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#include "dbop-as3525.h"
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#if defined(SANSA_FUZE)
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#define DBOP_PRECHARGE 0x80FF
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#elif defined(SANSA_E200V2) || defined(SANSA_C200V2)
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#define DBOP_PRECHARGE 0xF0FF
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#endif
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static short int dbop_input_value = 0;
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/* read the DBOP data pins */
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unsigned short dbop_read_input(void)
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{
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unsigned int dbop_ctrl_old = DBOP_CTRL;
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unsigned int dbop_timpol23_old = DBOP_TIMPOL_23;
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/* make sure that the DBOP FIFO is empty */
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while ((DBOP_STAT & (1<<10)) == 0);
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/* write DBOP_DOUT to pre-charge DBOP data lines with a defined level */
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DBOP_TIMPOL_23 = 0xe007e007; /* no strobe towards lcd */
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int delay = 10;
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while (delay--) asm volatile ("nop\n");
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DBOP_CTRL = (1 << 19) | /* tri-state output */
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(1 << 16) | /* enw=1 (enable write) */
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(1 << 12); /* ow=1 (16-bit data width) */
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DBOP_DOUT = DBOP_PRECHARGE;
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while ((DBOP_STAT & (1<<10)) == 0);
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#if defined(SANSA_FUZE) || defined(SANSA_E200V2)
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delay = 50;
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while (delay--) asm volatile ("nop\n");
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#endif
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/* perform a DBOP read */
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DBOP_CTRL = (1 << 19) | /* tri-state output */
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(1 << 15) | /* strd=1 (start read) */
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(1 << 12) | /* ow=1 (16-bit data width) */
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(31 << 0); /* rs_t=31 (read DBOP at end of cycle) */
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while ((DBOP_STAT & (1<<16)) == 0);
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dbop_input_value = DBOP_DIN;
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/* restore previous values */
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DBOP_TIMPOL_23 = dbop_timpol23_old;
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DBOP_CTRL = dbop_ctrl_old;
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return dbop_input_value;
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}
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/* for the debug menu */
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unsigned short dbop_debug(void)
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{
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return dbop_input_value;
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}
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static inline void dbop_set_mode(int mode)
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{
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int delay = 10;
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if (mode == 32 && (!(DBOP_CTRL & (1<<13|1<<14))))
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DBOP_CTRL |= (1<<13|1<<14);
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else if (mode == 16 && (DBOP_CTRL & (1<<13|1<<14)))
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DBOP_CTRL &= ~(1<<14|1<<13);
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else
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return;
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while(delay--) asm volatile("nop");
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}
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void dbop_write_data(const int16_t* p_bytes, int count)
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{
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const int32_t *data;
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if ((intptr_t)p_bytes & 0x3 || count == 1)
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{ /* need to do a single 16bit write beforehand if the address is
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* not word aligned or count is 1, switch to 16bit mode if needed */
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dbop_set_mode(16);
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DBOP_DOUT16 = *p_bytes++;
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if (!(--count))
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return;
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}
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/* from here, 32bit transfers are save
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* set it to transfer 4*(outputwidth) units at a time,
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* if bit 12 is set it only does 2 halfwords though (we never set it)
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* switch to 32bit output if needed */
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dbop_set_mode(32);
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data = (int32_t*)p_bytes;
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while (count > 1)
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{
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DBOP_DOUT32 = *data++;
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count -= 2;
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/* Wait if push fifo is full */
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while ((DBOP_STAT & (1<<6)) != 0);
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}
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/* While push fifo is not empty */
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while ((DBOP_STAT & (1<<10)) == 0);
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/* due to the 32bit alignment requirement or uneven count,
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* we possibly need to do a 16bit transfer at the end also */
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if (count > 0)
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dbop_write_data((int16_t*)data, 1);
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}
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