151 lines
4.2 KiB
C
151 lines
4.2 KiB
C
/* $Id: at91pmc.c,v 1.5 2011/11/04 17:21:46 aymeric Exp $ */
|
|
/* $NetBSD: at91pmc.c,v 1.5 2011/11/04 17:21:46 aymeric Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 2007 Embedtronics Oy
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
|
|
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
|
|
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
|
|
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
|
|
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
|
|
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
|
|
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
|
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
|
|
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
|
|
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
* POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__KERNEL_RCSID(0, "$NetBSD");
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/time.h>
|
|
#include <sys/device.h>
|
|
|
|
#include <sys/bus.h>
|
|
#include <machine/intr.h>
|
|
|
|
#include <arm/cpufunc.h>
|
|
|
|
#include <arm/at91/at91reg.h>
|
|
#include <arm/at91/at91var.h>
|
|
#include <arm/at91/at91pmcreg.h>
|
|
#include <arm/at91/at91pmcvar.h>
|
|
|
|
#define SLOW_CLOCK 32768LU
|
|
|
|
void
|
|
at91pmc_get_clocks(struct at91bus_clocks *clocks)
|
|
{
|
|
u_int64_t mclk, pllaclk, pllbclk, pclk, mstclk;
|
|
u_int32_t reg;
|
|
|
|
if (!((reg = PMCREG(PMC_MOR)) & PMC_MOR_MOSCEN))
|
|
panic("%s: main oscillator not enabled (MOR=0x%#X)", __FUNCTION__, reg);
|
|
|
|
if (!((reg = PMCREG(PMC_MCFR)) & PMC_MCFR_MAINRDY))
|
|
panic("%s: main oscillator not ready (MCFR=0x%#X)", __FUNCTION__, reg);
|
|
|
|
mclk = ((reg & PMC_MCFR_MAINF) * SLOW_CLOCK) / 16U;
|
|
|
|
// try to guess some nice MHz value
|
|
if (((mclk / 1000) % 1000) >= 990) {
|
|
mclk += 1000000U - (mclk % 1000000U);
|
|
} else if (((mclk / 1000) % 1000) <= 10) {
|
|
mclk -= (mclk % 1000000U);
|
|
}
|
|
|
|
PMCREG(PMC_PLLICPR) = PMC_PLLICPR_ICPPLLA | PMC_PLLICPR_ICPPLLB;
|
|
|
|
reg = PMCREG(PMC_PLLAR); pllaclk = 0;
|
|
if (reg & PMC_PLL_DIV) {
|
|
pllaclk = mclk * (((reg & PMC_PLL_MUL) >> PMC_PLL_MUL_SHIFT) + 1);
|
|
pllaclk /= (reg & PMC_PLL_DIV) >> PMC_PLL_DIV_SHIFT;
|
|
}
|
|
|
|
reg = PMCREG(PMC_PLLBR); pllbclk = 0;
|
|
if (reg & PMC_PLL_DIV) {
|
|
pllbclk = mclk * (((reg & PMC_PLL_MUL) >> PMC_PLL_MUL_SHIFT) + 1);
|
|
pllbclk /= (reg & PMC_PLL_DIV) >> PMC_PLL_DIV_SHIFT;
|
|
if (reg & PMC_PLLBR_USB_96M) {
|
|
pllbclk /= 2;
|
|
}
|
|
}
|
|
|
|
reg = PMCREG(PMC_MCKR);
|
|
switch ((reg & PMC_MCKR_CSS)) {
|
|
case PMC_MCKR_CSS_SLOW_CLK:
|
|
pclk = SLOW_CLOCK;
|
|
break;
|
|
default:
|
|
case PMC_MCKR_CSS_MAIN_CLK:
|
|
pclk = mclk;
|
|
break;
|
|
case PMC_MCKR_CSS_PLLA:
|
|
pclk = pllaclk;
|
|
break;
|
|
case PMC_MCKR_CSS_PLLB:
|
|
pclk = pllbclk;
|
|
break;
|
|
}
|
|
pclk >>= (reg & PMC_MCKR_PRES) >> PMC_MCKR_PRES_SHIFT;
|
|
mstclk = pclk / (((reg & PMC_MCKR_MDIV) >> PMC_MCKR_MDIV_SHIFT) + 1);
|
|
|
|
clocks->slow = SLOW_CLOCK;
|
|
clocks->main = mclk;
|
|
clocks->cpu = pclk;
|
|
clocks->master = mstclk;
|
|
clocks->plla = pllaclk;
|
|
clocks->pllb = pllbclk;
|
|
}
|
|
|
|
|
|
#define PID_COUNT 32
|
|
static int pid_enable_count[PID_COUNT] = {0};
|
|
|
|
void
|
|
at91pmc_peripheral_clock(int pid, int enable)
|
|
{
|
|
int s;
|
|
|
|
if (pid < 0 || pid >= PID_COUNT)
|
|
panic("%s: pid %d out of range", __FUNCTION__, pid);
|
|
|
|
s = splhigh();
|
|
|
|
if (enable) {
|
|
pid_enable_count[pid]++;
|
|
PMCREG(PMC_PCER) = (1U << pid);
|
|
} else {
|
|
if (--pid_enable_count[pid] < 0)
|
|
panic("%s: pid %d enable count got negative (%d)",
|
|
__FUNCTION__, pid, pid_enable_count[pid]);
|
|
if (pid_enable_count[pid] == 0)
|
|
PMCREG(PMC_PCDR) = (1U << pid);
|
|
}
|
|
|
|
splx(s);
|
|
|
|
if (enable) {
|
|
int c;
|
|
for (c = 0; c < 10000; c++) {
|
|
__insn_barrier();
|
|
}
|
|
}
|
|
}
|