246 lines
No EOL
7.1 KiB
C
246 lines
No EOL
7.1 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) 2013 by Amaury Pouly
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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 "regs-pinctrl.h"
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#include "regs-power.h"
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#include "regs-lradc.h"
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#include "regs-digctl.h"
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#define BOOT_ROM_CONTINUE 0 /* continue boot */
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#define BOOT_ROM_SECTION 1 /* switch to new section *result_id */
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typedef unsigned long uint32_t;
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// target specific boot context
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enum context_t
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{
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CONTEXT_NORMAL, /* normal boot */
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CONTEXT_USB, /* USB plugged boot */
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CONTEXT_RTC, /* RTC wake up boot */
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};
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// target specific boot decision
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enum boot_t
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{
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BOOT_STOP, /* power down */
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BOOT_ROCK, /* boot to Rockbox */
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BOOT_OF, /* boot to OF */
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};
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/**
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* Helper functions
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*/
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static inline int __attribute__((always_inline)) read_gpio(int bank, int pin)
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{
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return (HW_PINCTRL_DINn(bank) >> pin) & 1;
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}
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static inline int __attribute__((always_inline)) read_pswitch(void)
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{
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#if IMX233_SUBTARGET >= 3700
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return BF_RD(POWER_STS, PSWITCH);
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#else
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return BF_RD(DIGCTL_STATUS, PSWITCH);
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#endif
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}
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/* only works for channels <=7, always divide by 2, never accumulates */
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static inline void __attribute__((always_inline)) setup_lradc(int src)
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{
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BF_CLR(LRADC_CTRL0, SFTRST);
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BF_CLR(LRADC_CTRL0, CLKGATE);
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/* don't bother changing the source, we are early enough at boot so that
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* channel x is mapped to source x */
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HW_LRADC_CHn_CLR(src) = BM_OR2(LRADC_CHn, NUM_SAMPLES, ACCUMULATE);
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BF_SETV(LRADC_CTRL2, DIVIDE_BY_TWO, 1 << src);
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}
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#define BP_LRADC_CTRL1_LRADCx_IRQ(x) (x)
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#define BM_LRADC_CTRL1_LRADCx_IRQ(x) (1 << (x))
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static inline int __attribute__((always_inline)) read_lradc(int src)
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{
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BF_CLR(LRADC_CTRL1, LRADCx_IRQ(src));
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BF_SETV(LRADC_CTRL0, SCHEDULE, 1 << src);
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while(!BF_RD(LRADC_CTRL1, LRADCx_IRQ(src)));
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return BF_RDn(LRADC_CHn, src, VALUE);
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}
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static inline void __attribute__((noreturn)) power_down()
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{
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#ifdef SANSA_FUZEPLUS
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/* B0P09: this pin seems to be important to shutdown the hardware properly */
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HW_PINCTRL_MUXSELn_SET(0) = 3 << 18;
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HW_PINCTRL_DOEn(0) = 1 << 9;
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HW_PINCTRL_DOUTn(0) = 1 << 9;
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#endif
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/* power down */
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HW_POWER_RESET = BM_OR2(POWER_RESET, UNLOCK, PWD);
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while(1);
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}
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/**
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* Boot decision functions
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*/
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#if defined(SANSA_FUZEPLUS)
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static enum boot_t boot_decision(enum context_t context)
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{
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/* if volume down is hold, boot to OF */
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if(!read_gpio(1, 30))
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return BOOT_OF;
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/* on normal boot, make sure power button is hold long enough */
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if(context == CONTEXT_NORMAL)
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{
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// monitor PSWITCH
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int count = 0;
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for(int i = 0; i < 550000; i++)
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if(read_pswitch() == 1)
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count++;
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if(count < 400000)
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return BOOT_STOP;
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}
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return BOOT_ROCK;
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}
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#elif defined(CREATIVE_ZENXFI2)
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static int boot_decision(int context)
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{
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/* We are lacking buttons on the Zen X-Fi2 because on USB, the select button
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* enters recovery mode ! So we can only use power but power is used to power up
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* on normal boots and then select is free ! Thus use a non-uniform scheme:
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* - normal boot/RTC:
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* - no key: Rockbox
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* - select: OF
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* - USB boot:
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* - no key: Rockbox
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* - power: OF
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*/
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if(context == CONTEXT_USB)
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return read_pswitch() == 1 ? BOOT_OF : BOOT_ROCK;
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else
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return !read_gpio(0, 14) ? BOOT_OF : BOOT_ROCK;
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}
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#elif defined(CREATIVE_ZENXFI3)
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static int boot_decision(int context)
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{
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/* if volume down is hold, boot to OF */
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return !read_gpio(2, 7) ? BOOT_OF : BOOT_ROCK;
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}
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#elif defined(SONY_NWZE360) || defined(SONY_NWZE370)
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static int local_decision(void)
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{
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/* read keys and pswitch */
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int val = read_lradc(0);
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/* if hold is on, power off
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* if back is pressed, boot to OF
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* if play is pressed, boot RB
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* otherwise power off */
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if(read_gpio(0, 9) == 0)
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return BOOT_STOP;
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if(val >= 1050 && val < 1150)
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return BOOT_OF;
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if(val >= 1420 && val < 1520)
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return BOOT_ROCK;
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return BOOT_STOP;
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}
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static int boot_decision(int context)
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{
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setup_lradc(0); // setup LRADC channel 0 to read keys
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HW_PINCTRL_PULLn_SET(0) = 1 << 9; // enable pullup on hold key (B0P09)
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/* make a decision */
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int decision = local_decision();
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/* in USB or alarm context, stick to it */
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if(context == CONTEXT_USB || context == CONTEXT_RTC)
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{
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/* never power down so replace power off decision by rockbox */
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return decision == BOOT_STOP ? BOOT_ROCK : decision;
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}
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/* otherwise start a 1 second timeout. Any decision change
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* will result in power down */
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uint32_t tmo = HW_DIGCTL_MICROSECONDS + 1000000;
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while(HW_DIGCTL_MICROSECONDS < tmo)
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{
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int new_dec = local_decision();
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if(new_dec != decision)
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return BOOT_STOP;
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}
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return decision;
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}
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#elif defined(CREATIVE_ZENXFISTYLE)
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static int boot_decision(int context)
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{
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setup_lradc(2); // setup LRADC channel 2 to read keys
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/* make a decision */
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int val = read_lradc(2);
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/* boot to OF if left is hold
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* NOTE: VDDIO is set to 3.1V initially and the resistor ladder is wired to
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* VDDIO so these values are not the same as in the main binary which is
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* calibrated for VDDIO=3.3V */
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if(val >= 815 && val < 915)
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return BOOT_OF;
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return BOOT_ROCK;
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}
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#else
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#warning You should define a target specific boot decision function
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static int boot_decision(int context)
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{
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return BOOT_ROCK;
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}
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#endif
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/**
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* Context functions
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*/
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static inline enum context_t get_context(void)
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{
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#if IMX233_SUBTARGET >= 3780
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/* On the imx233 it's easy because we know the power up source */
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unsigned pwrup_src = BF_RD(POWER_STS, PWRUP_SOURCE);
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if(pwrup_src & (1 << 5))
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return CONTEXT_USB;
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else if(pwrup_src & (1 << 4))
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return CONTEXT_RTC;
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else
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return CONTEXT_NORMAL;
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#else
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/* On the other targets, we need to poke a few more registers */
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#endif
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}
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int main(uint32_t arg, uint32_t *result_id)
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{
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switch(boot_decision(get_context()))
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{
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case BOOT_ROCK:
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*result_id = arg;
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return BOOT_ROM_SECTION;
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case BOOT_OF:
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return BOOT_ROM_CONTINUE;
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case BOOT_STOP:
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default:
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power_down();
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}
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}
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int __attribute__((section(".start"))) start(uint32_t arg, uint32_t *result_id)
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{
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return main(arg, result_id);
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} |