c876d3bbef
rbutil uses several components from the utils folder, and can be considered part of utils too. Having it in a separate folder is an arbitrary split that doesn't help anymore these days, so merge them. This also allows other utils to easily use libtools.make without the need to navigate to a different folder. Change-Id: I3fc2f4de19e3e776553efb5dea5f779dfec0dc21
136 lines
3.8 KiB
C
136 lines
3.8 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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typedef unsigned long uint32_t;
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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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/* 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(CREATIVE_ZENMOZAIC) || defined(CREATIVE_ZEN) || defined(CREATIVE_ZENXFI) \
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|| defined(CREATIVE_ZENV)
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static enum boot_t boot_decision()
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{
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setup_lradc(0); // setup LRADC channel 0 to read keys
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/* make a decision */
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/* read keys */
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int val = read_lradc(0);
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/* if back is pressed, boot to OF
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* otherwise boot to RB */
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if(val >= 2650 && val < 2750) // conveniently, all players use the same value
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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()
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{
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return BOOT_ROCK;
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}
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#endif
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static int main(uint32_t rb_addr, uint32_t of_addr)
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{
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switch(boot_decision())
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{
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case BOOT_ROCK:
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return rb_addr;
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case BOOT_OF:
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/* fix back the loading address
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/* NOTE: see mkzenboot for more details */
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*(uint32_t *)0x20 = of_addr;
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return 0;
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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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/** Glue for the linker mostly */
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extern uint32_t of_vector;
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extern uint32_t rb_vector;
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extern uint32_t boot_arg;
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void __attribute__((section(".start"))) start()
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{
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uint32_t addr = main(rb_vector, of_vector);
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((void (*)(uint32_t))addr)(boot_arg);
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}
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