[PATCH 11/15] HiFive1: set up oscillators

[Denis Obrezkov]

2017-08-17 17:16 GMT+02:00 Gedare Bloom <gedare at rtems.org>:

> On Wed, Aug 16, 2017 at 11:13 AM, Denis Obrezkov
> <denisobrezkov at gmail.com> wrote:
> > ---
> >  c/src/lib/libbsp/riscv32/hifive1/start/bspstart.c | 65
> +++++++++++++++++++++++
> >  1 file changed, 65 insertions(+)
> >  create mode 100644 c/src/lib/libbsp/riscv32/hifive1/start/bspstart.c
> >
> > diff --git a/c/src/lib/libbsp/riscv32/hifive1/start/bspstart.c
> b/c/src/lib/libbsp/riscv32/hifive1/start/bspstart.c
> > new file mode 100644
> > index 0000000..efef4e0
> > --- /dev/null
> > +++ b/c/src/lib/libbsp/riscv32/hifive1/start/bspstart.c
> > @@ -0,0 +1,65 @@
> > +/*
> > + *  Copyright (c) 2017
> > + *  Denis Obrezkov <denisobrezkov at gmail.com>
> > + *
> > + *  The license and distribution terms for this file may be
> > + *  found in the file LICENSE in this distribution or at
> > + *  http://www.rtems.org/license/LICENSE.
> > + */
> > +
> > +#include <bsp.h>
> > +#include <bsp/bootcard.h>
> > +#include <bsp/prci.h>
> > +#include <bsp/fe310.h>
> > +
> > +/*
> > + * This routine make initialization of HiFive1 (FE310) counters.
> > + */
> > +
> > +void bsp_start( void )
> > +{
> > +  volatile uint32_t * pll_reg = (volatile uint32_t *) PRCI_PLLCFG;
> > +  volatile uint32_t * high_freq_reg = (volatile uint32_t *)
> PRCI_HFROSCCFG;
> > +  volatile uint32_t * spi0 = (volatile uint32_t *) 0x10014000;
> > +
> > +  volatile uint64_t * mtime_reg = (volatile uint64_t * ) 0x0200bff8;
> > +  volatile uint64_t * mtimecmp_reg = (volatile uint64_t * ) 0x02004000;
> > +
> > +#ifdef USE_HFROSC
> > +  /* Setting up osc frequency */
> > +  uint32_t tmp_reg = 0;
> > +  /* Install divider in high frequency oscillator */
> > +  tmp_reg |= (HFROSC_DIV_VAL & 0x2f) << HFROSC_DIV_OFFSET;
> > +  tmp_reg |= (HFROSC_TRIM_VAL & 0x1F) << HFROSC_TRIM_OFFSET;
> > +  tmp_reg |= (HFROSC_EN_VAL & 0x1) << HFROSC_EN_OFFSET;
> > +  (*high_freq_reg) = tmp_reg;
> It would be good to make the above into a function.
>
I agree but in what file should we place it?
it's not a clock or a timer.

>
> > +  while (( (*high_freq_reg) & ((HFROSC_RDY_VAL & 0x1) \
> > +                  << HFROSC_RDY_OFFSET)) == 0 ) {
> > +    ;
> > +  }
> > +#endif /* USE_HFROSC */
> > +
> > +#ifdef USE_HFXOSC
> > +  volatile uint32_t * ext_freq_reg = (volatile uint32_t *)
> PRCI_HFXOSCCFG;
> > +  (*ext_freq_reg) |= ((HFXOSC_EN_VAL & 0x1) << HFXOSC_EN_OFFSET);
> > +  while (( (*ext_freq_reg) & ((HFXOSC_RDY_VAL & 0x1) \
> > +                  << HFXOSC_RDY_OFFSET)) == 0 ) {
> > +    ;
> > +  }
> > +  (*pll_reg) |= (0x1 << 18);
> > +  (*pll_reg) |= (0x1 << 17);
> > +  (*pll_reg) |= (0x1 << PLL_SEL_OFFSET);
> > +  (*high_freq_reg) &= ~(0x1 << HFROSC_EN_OFFSET);
> > +
> > +#endif /* USE_HFXOSC */
> > +#ifndef USE_PLL
> > +  /* Disable PLL */
> > +  (*pll_reg) &= ~(0x1 << PLL_SEL_OFFSET);
> > +#else
> > +
> > +#endif
> > +
> > +  bsp_interrupt_initialize();
> > +
> > +}
> > +
> > --
> > 2.1.4
> >
> > _______________________________________________
> > devel mailing list
> > devel at rtems.org
> > http://lists.rtems.org/mailman/listinfo/devel
>



-- 
Regards, Denis Obrezkov
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