b4994a08ca
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@12588 a1c6a512-1295-4272-9138-f99709370657
540 lines
15 KiB
C
540 lines
15 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) 2006 by Linus Nielsen Feltzing
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*
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* All files in this archive are subject to the GNU General Public License.
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* See the file COPYING in the source tree root for full license agreement.
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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 "system.h"
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#include "logf.h"
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#include "kernel.h"
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#include "pcf50606.h"
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#define USE_ASM
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/* Define the approprate bits for SDA and SCL being the only difference in
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config between each player. */
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#if defined(IRIVER_H300_SERIES)
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#define SDA_BITNUM 13 /* LRCK3/GPIO45 */
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#define SCL_BITNUM 12 /* SWE/GPIO12 */
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#elif defined(IAUDIO_X5) || defined(IAUDIO_M5)
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#define SDA_BITNUM 12 /* SDA1/RXD1/GPIO44 */
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#define SCL_BITNUM 10 /* SCL1/TXD1/GPIO10 */
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#endif
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/* Data */
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#define SDA_GPIO_READ GPIO1_READ /* MBAR2 + 0x0b0 */
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#define SDA_GPIO_OUT GPIO1_OUT /* MBAR2 + 0x0b4 */
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#define SDA_GPIO_ENABLE GPIO1_ENABLE /* MBAR2 + 0x0b8 */
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#define SDA_GPIO_FUNCTION GPIO1_FUNCTION /* MBAR2 + 0x0bc */
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/* Clock */
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#define SCL_GPIO_READ GPIO_READ /* MBAR2 + 0x000 */
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#define SCL_GPIO_OUT GPIO_OUT /* MBAR2 + 0x004 */
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#define SCL_GPIO_ENABLE GPIO_ENABLE /* MBAR2 + 0x008 */
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#define SCL_GPIO_FUNCTION GPIO_FUNCTION /* MBAR2 + 0x00c */
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#define PCF50606_ADDR 0x10
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#define SCL_BIT (1ul << SCL_BITNUM)
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#define SDA_BIT (1ul << SDA_BITNUM)
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#define SDA ( SDA_BIT & SDA_GPIO_READ)
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#define SDA_LO_OUT or_l( SDA_BIT, &SDA_GPIO_ENABLE)
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#define SDA_HI_IN and_l(~SDA_BIT, &SDA_GPIO_ENABLE)
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#define SCL ( SCL_BIT & SCL_GPIO_READ)
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#define SCL_LO_OUT or_l( SCL_BIT, &SCL_GPIO_ENABLE)
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#define SCL_HI_IN and_l(~SCL_BIT, &SCL_GPIO_ENABLE); while(!SCL);
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#define DELAY \
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asm ( \
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"move.l %[dly],%%d0 \n" \
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"1: \n" \
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"subq.l #1,%%d0 \n" \
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"bhi.s 1b \n" \
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: : [dly]"d"(i2c_delay) : "d0" );
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void pcf50606_i2c_init(void)
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{
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/* Bit banged I2C */
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or_l(SDA_BIT, &SDA_GPIO_FUNCTION);
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or_l(SCL_BIT, &SCL_GPIO_FUNCTION);
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and_l(~SDA_BIT, &SDA_GPIO_OUT);
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and_l(~SCL_BIT, &SCL_GPIO_OUT);
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and_l(~SDA_BIT, &SDA_GPIO_ENABLE);
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and_l(~SCL_BIT, &SCL_GPIO_ENABLE);
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}
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static int i2c_delay IDATA_ATTR = 44;
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void pcf50606_i2c_recalc_delay(int cpu_clock)
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{
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i2c_delay = MAX(cpu_clock / (400000*2*3) - 7, 1);
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}
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inline void pcf50606_i2c_start(void)
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{
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#ifdef USE_ASM
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asm (
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"not.l %[sdab] \n" /* SDA_HI_IN */
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"and.l %[sdab],(8,%[sdard]) \n"
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"not.l %[sdab] \n"
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"not.l %[sclb] \n" /* SCL_HI_IN */
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"and.l %[sclb],(8,%[sclrd]) \n"
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"not.l %[sclb] \n"
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"1: \n"
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"move.l (%[sclrd]),%%d0 \n"
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"btst.l %[sclbnum], %%d0 \n"
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"beq.s 1b \n"
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"move.l %[dly],%%d0 \n" /* DELAY */
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"1: \n"
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"subq.l #1,%%d0 \n"
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"bhi.s 1b \n"
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"or.l %[sdab],(8,%[sdard]) \n" /* SDA_LO_OUT */
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"move.l %[dly],%%d0 \n" /* DELAY */
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"1: \n"
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"subq.l #1,%%d0 \n"
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"bhi.s 1b \n"
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"or.l %[sclb],(8,%[sclrd]) \n" /* SCL_LO_OUT */
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: /* outputs */
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: /* inputs */
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[sclrd] "a"(&SCL_GPIO_READ),
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[sclb] "d"(SCL_BIT),
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[sclbnum] "i"(SCL_BITNUM),
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[sdard] "a"(&SDA_GPIO_READ),
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[sdab] "d"(SDA_BIT),
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[dly] "d"(i2c_delay)
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: /* clobbers */
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"d0"
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);
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#else
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SDA_HI_IN;
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SCL_HI_IN;
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DELAY;
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SDA_LO_OUT;
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DELAY;
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SCL_LO_OUT;
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#endif
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}
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inline void pcf50606_i2c_stop(void)
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{
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#ifdef USE_ASM
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asm (
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"or.l %[sdab],(8,%[sdard]) \n" /* SDA_LO_OUT */
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"not.l %[sclb] \n" /* SCL_HI_IN */
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"and.l %[sclb],(8,%[sclrd]) \n"
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"not.l %[sclb] \n"
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"1: \n"
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"move.l (%[sclrd]),%%d0 \n"
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"btst.l %[sclbnum],%%d0 \n"
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"beq.s 1b \n"
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"move.l %[dly],%%d0 \n" /* DELAY */
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"1: \n"
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"subq.l #1,%%d0 \n"
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"bhi.s 1b \n"
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"not.l %[sdab] \n" /* SDA_HI_IN */
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"and.l %[sdab],(8,%[sdard]) \n"
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"not.l %[sdab] \n"
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: /* outputs */
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: /* inputs */
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[sclrd] "a"(&SCL_GPIO_READ),
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[sclb] "d"(SCL_BIT),
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[sclbnum] "i"(SCL_BITNUM),
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[sdard] "a"(&SDA_GPIO_READ),
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[sdab] "d"(SDA_BIT),
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[dly] "d"(i2c_delay)
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: /* clobbers */
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"d0"
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);
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#else
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SDA_LO_OUT;
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SCL_HI_IN;
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DELAY;
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SDA_HI_IN;
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#endif
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}
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inline void pcf50606_i2c_ack(bool ack)
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{
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#ifdef USE_ASM
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asm (
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"tst.b %[ack] \n" /* if (!ack) */
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"bne.s 1f \n"
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"not.l %[sdab] \n" /* SDA_HI_IN */
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"and.l %[sdab],(8,%[sdard]) \n"
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"not.l %[sdab] \n"
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".word 0x51fb \n" /* trapf.l : else */
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"1: \n"
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"or.l %[sdab],(8,%[sdard]) \n" /* SDA_LO_OUT */
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"not.l %[sclb] \n" /* SCL_HI_IN */
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"and.l %[sclb],(8,%[sclrd]) \n"
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"not.l %[sclb] \n"
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"1: \n"
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"move.l (%[sclrd]),%%d0 \n"
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"btst.l %[sclbnum],%%d0 \n"
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"beq.s 1b \n"
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"move.l %[dly],%%d0 \n" /* DELAY */
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"1: \n"
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"subq.l #1,%%d0 \n"
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"bhi.s 1b \n"
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"or.l %[sclb],(8,%[sclrd]) \n" /* SCL_LO_OUT */
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: /* outputs */
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: /* inputs */
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[sclrd] "a"(&SCL_GPIO_READ),
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[sclb] "d"(SCL_BIT),
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[sclbnum] "i"(SCL_BITNUM),
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[sdard] "a"(&SDA_GPIO_READ),
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[sdab] "d"(SDA_BIT),
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[dly] "d"(i2c_delay),
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[ack] "d"(ack)
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: /* clobbers */
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"d0"
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);
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#else
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if(ack)
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SDA_LO_OUT;
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else
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SDA_HI_IN;
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SCL_HI_IN;
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DELAY;
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SCL_LO_OUT;
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#endif
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}
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inline bool pcf50606_i2c_getack(void)
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{
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bool ret;
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#ifdef USE_ASM
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asm (
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"not.l %[sdab] \n" /* SDA_HI_IN */
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"and.l %[sdab],(8,%[sdard]) \n"
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"not.l %[sdab] \n"
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"move.l %[dly],%%d0 \n" /* DELAY */
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"1: \n"
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"subq.l #1,%%d0 \n"
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"bhi.s 1b \n"
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"not.l %[sclb] \n" /* SCL_HI_IN */
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"and.l %[sclb],(8,%[sclrd]) \n"
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"not.l %[sclb] \n"
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"1: \n"
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"move.l (%[sclrd]),%%d0 \n"
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"btst.l %[sclbnum],%%d0 \n"
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"beq.s 1b \n"
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"move.l (%[sdard]),%%d0 \n" /* ret = !SDA */
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"btst.l %[sdabnum],%%d0 \n"
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"seq.b %[ret] \n"
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"or.l %[sclb],(8,%[sclrd]) \n" /* SCL_LO_OUT */
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"move.l %[dly],%%d0 \n" /* DELAY */
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"1: \n"
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"subq.l #1,%%d0 \n"
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"bhi.s 1b \n"
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: /* outputs */
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[ret] "=&d"(ret)
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: /* inputs */
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[sclrd] "a"(&SCL_GPIO_READ),
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[sclb] "d"(SCL_BIT),
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[sclbnum] "i"(SCL_BITNUM),
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[sdard] "a"(&SDA_GPIO_READ),
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[sdab] "d"(SDA_BIT),
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[sdabnum] "i"(SDA_BITNUM),
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[dly] "d"(i2c_delay)
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: /* clobbers */
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"d0"
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);
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#else
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SDA_HI_IN;
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DELAY;
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SCL_HI_IN;
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ret = !SDA;
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SCL_LO_OUT;
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DELAY;
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#endif
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return ret;
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}
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void pcf50606_i2c_outb(unsigned char byte)
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{
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#ifdef USE_ASM
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asm volatile (
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"moveq.l #24,%%d0 \n" /* byte <<= 24 */
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"lsl.l %%d0,%[byte] \n"
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"moveq.l #8,%%d1 \n" /* i = 8 */
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"2: \n" /* do */
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"lsl.l #1,%[byte] \n" /* if ((byte <<= 1) carry) */
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"bcc.s 1f \n"
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"not.l %[sdab] \n" /* SDA_HI_IN */
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"and.l %[sdab],(8,%[sdard]) \n"
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"not.l %[sdab] \n"
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".word 0x51fb \n" /* trapf.l; else */
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"1: \n"
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"or.l %[sdab],(8,%[sdard]) \n" /* SDA_LO_OUT */
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"move.l %[dly],%%d0 \n" /* DELAY */
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"1: \n"
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"subq.l #1,%%d0 \n"
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"bhi.s 1b \n"
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"not.l %[sclb] \n" /* SCL_HI_IN */
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"and.l %[sclb],(8,%[sclrd]) \n"
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"not.l %[sclb] \n"
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"1: \n"
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"move.l (%[sclrd]),%%d0 \n"
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"btst.l %[sclbnum],%%d0 \n"
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"beq.s 1b \n"
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"move.l %[dly],%%d0 \n" /* DELAY */
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"1: \n"
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"subq.l #1,%%d0 \n"
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"bhi.s 1b \n"
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"or.l %[sclb],(8,%[sclrd]) \n" /* SCL_LO_OUT */
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"subq.l #1,%%d1 \n" /* i-- */
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"bne.s 2b \n" /* while (i != 0) */
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: /* outputs */
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[byte] "+d"(byte)
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: /* inputs */
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[sclrd] "a"(&SCL_GPIO_READ),
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[sclb] "d"(SCL_BIT),
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[sclbnum] "i"(SCL_BITNUM),
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[sdard] "a"(&SDA_GPIO_READ),
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[sdab] "d"(SDA_BIT),
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[dly] "d"(i2c_delay)
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: /* clobbers */
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"d0", "d1"
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);
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#else
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int i;
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/* clock out each bit, MSB first */
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for ( i=0x80; i; i>>=1 )
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{
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if ( i & byte )
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SDA_HI_IN;
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else
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SDA_LO_OUT;
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DELAY;
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SCL_HI_IN;
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DELAY;
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SCL_LO_OUT;
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}
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#endif
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}
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unsigned char pcf50606_i2c_inb(bool ack)
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{
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unsigned char byte = 0;
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#ifdef USE_ASM
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asm (
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"not.l %[sdab] \n" /* SDA_HI_IN */
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"and.l %[sdab],(8,%[sdard]) \n"
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"not.l %[sdab] \n"
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"moveq.l #8,%%d1 \n" /* i = 8 */
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"clr.l %[byte] \n" /* byte = 0 */
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"2: \n" /* do */
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"not.l %[sclb] \n" /* SCL_HI_IN */
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"and.l %[sclb],(8,%[sclrd]) \n"
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"not.l %[sclb] \n"
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"1: \n"
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"move.l (%[sclrd]),%%d0 \n"
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"btst.l %[sclbnum],%%d0 \n"
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"beq.s 1b \n"
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"move.l %[dly],%%d0 \n" /* DELAY */
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"1: \n"
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"subq.l #1,%%d0 \n"
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"bhi.s 1b \n"
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"lsl.l #1,%[byte] \n" /* byte <<= 1 */
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"move.l (%[sdard]),%%d0 \n" /* if (SDA) */
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"btst.l %[sdabnum],%%d0 \n"
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"beq.s 1f \n"
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"addq.l #1,%[byte] \n" /* byte++ */
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"1: \n"
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"or.l %[sclb],(8,%[sclrd]) \n" /* SCL_LO_OUT */
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"move.l %[dly],%%d0 \n" /* DELAY */
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"1: \n"
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"subq.l #1,%%d0 \n"
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"bhi.s 1b \n"
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"subq.l #1,%%d1 \n" /* i-- */
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"bne.s 2b \n" /* while (i != 0) */
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: /* outputs */
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[byte] "=&d"(byte)
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: /* inputs */
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[sclrd] "a"(&SCL_GPIO_READ),
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[sclb] "d"(SCL_BIT),
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[sclbnum] "i"(SCL_BITNUM),
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[sdard] "a"(&SDA_GPIO_READ),
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[sdab] "d"(SDA_BIT),
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[sdabnum] "i"(SDA_BITNUM),
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[dly] "d"(i2c_delay)
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: /* clobbers */
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"d0", "d1"
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);
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#else
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int i;
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/* clock in each bit, MSB first */
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SDA_HI_IN;
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for ( i=0x80; i; i>>=1 )
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{
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SCL_HI_IN;
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DELAY;
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if ( SDA )
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byte |= i;
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SCL_LO_OUT;
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DELAY;
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}
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#endif
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pcf50606_i2c_ack(ack);
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return byte;
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}
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int pcf50606_i2c_write(int address, const unsigned char* buf, int count)
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{
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int i,x=0;
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pcf50606_i2c_start();
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pcf50606_i2c_outb(address & 0xfe);
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if (pcf50606_i2c_getack())
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{
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for (i=0; i<count; i++)
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{
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pcf50606_i2c_outb(buf[i]);
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if (!pcf50606_i2c_getack())
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{
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x=-2;
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break;
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}
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}
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}
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else
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{
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logf("pcf50606_i2c_write() - no ack\n");
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x=-1;
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}
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return x;
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}
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int pcf50606_read_multiple(int address, unsigned char* buf, int count)
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{
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int i=0;
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int ret = 0;
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unsigned char obuf[1];
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obuf[0] = address;
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/* send read command */
|
|
if (pcf50606_i2c_write(PCF50606_ADDR, obuf, 1) >= 0)
|
|
{
|
|
pcf50606_i2c_start();
|
|
pcf50606_i2c_outb(0x11);
|
|
if (pcf50606_i2c_getack())
|
|
{
|
|
for(i = 0;i < count-1;i++)
|
|
buf[i] = pcf50606_i2c_inb(true);
|
|
|
|
buf[i] = pcf50606_i2c_inb(false);
|
|
}
|
|
else
|
|
{
|
|
ret = -1;
|
|
}
|
|
}
|
|
|
|
pcf50606_i2c_stop();
|
|
|
|
return ret;
|
|
}
|
|
|
|
int pcf50606_read(int address)
|
|
{
|
|
int ret;
|
|
unsigned char c;
|
|
|
|
ret = pcf50606_read_multiple(address, &c, 1);
|
|
if(ret >= 0)
|
|
return c;
|
|
else
|
|
return ret;
|
|
}
|
|
|
|
int pcf50606_write_multiple(int address, const unsigned char* buf, int count)
|
|
{
|
|
unsigned char obuf[1];
|
|
int i;
|
|
int ret = 0;
|
|
|
|
obuf[0] = address;
|
|
|
|
/* send write command */
|
|
if (pcf50606_i2c_write(PCF50606_ADDR, obuf, 1) >= 0)
|
|
{
|
|
for (i=0; i<count; i++)
|
|
{
|
|
pcf50606_i2c_outb(buf[i]);
|
|
if (!pcf50606_i2c_getack())
|
|
{
|
|
ret = -2;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
ret = -1;
|
|
}
|
|
|
|
pcf50606_i2c_stop();
|
|
return ret;
|
|
}
|
|
|
|
int pcf50606_write(int address, unsigned char val)
|
|
{
|
|
return pcf50606_write_multiple(address, &val, 1);
|
|
}
|