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/*
* Copyright (C) 2005-2006 Atmel Corporation
*
* See file CREDITS for list of people who contributed to this
* project.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of
* the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
* MA 02111-1307 USA
*/
#include <common.h>
#include <command.h>
#include <asm/io.h>
#include <asm/sections.h>
#include <asm/sysreg.h>
#include <asm/arch/clk.h>
#include <asm/arch/memory-map.h>
#include "hsmc3.h"
#include "sm.h"
/* Sanity checks */
#if (CFG_CLKDIV_CPU > CFG_CLKDIV_HSB) \
|| (CFG_CLKDIV_HSB > CFG_CLKDIV_PBA) \
|| (CFG_CLKDIV_HSB > CFG_CLKDIV_PBB)
# error Constraint fCPU >= fHSB >= fPB{A,B} violated
#endif
#if defined(CONFIG_PLL) && ((CFG_PLL0_MUL < 1) || (CFG_PLL0_DIV < 1))
# error Invalid PLL multiplier and/or divider
#endif
DECLARE_GLOBAL_DATA_PTR;
static void pm_init(void)
{
uint32_t cksel;
#ifdef CONFIG_PLL
/* Initialize the PLL */
sm_writel(PM_PLL0, (SM_BF(PLLCOUNT, CFG_PLL0_SUPPRESS_CYCLES)
| SM_BF(PLLMUL, CFG_PLL0_MUL - 1)
| SM_BF(PLLDIV, CFG_PLL0_DIV - 1)
| SM_BF(PLLOPT, CFG_PLL0_OPT)
| SM_BF(PLLOSC, 0)
| SM_BIT(PLLEN)));
/* Wait for lock */
while (!(sm_readl(PM_ISR) & SM_BIT(LOCK0))) ;
#endif
/* Set up clocks for the CPU and all peripheral buses */
cksel = 0;
if (CFG_CLKDIV_CPU)
cksel |= SM_BIT(CPUDIV) | SM_BF(CPUSEL, CFG_CLKDIV_CPU - 1);
if (CFG_CLKDIV_HSB)
cksel |= SM_BIT(HSBDIV) | SM_BF(HSBSEL, CFG_CLKDIV_HSB - 1);
if (CFG_CLKDIV_PBA)
cksel |= SM_BIT(PBADIV) | SM_BF(PBASEL, CFG_CLKDIV_PBA - 1);
if (CFG_CLKDIV_PBB)
cksel |= SM_BIT(PBBDIV) | SM_BF(PBBSEL, CFG_CLKDIV_PBB - 1);
sm_writel(PM_CKSEL, cksel);
gd->cpu_hz = get_cpu_clk_rate();
#ifdef CONFIG_PLL
/* Use PLL0 as main clock */
sm_writel(PM_MCCTRL, SM_BIT(PLLSEL));
#endif
}
int cpu_init(void)
{
extern void _evba(void);
char *p;
/* in case of soft resets, disable watchdog */
sm_writel(WDT_CTRL, SM_BF(KEY, 0x55));
sm_writel(WDT_CTRL, SM_BF(KEY, 0xaa));
gd->cpu_hz = CFG_OSC0_HZ;
/* TODO: Move somewhere else, but needs to be run before we
* increase the clock frequency. */
hsmc3_writel(MODE0, 0x00031103);
hsmc3_writel(CYCLE0, 0x000c000d);
hsmc3_writel(PULSE0, 0x0b0a0906);
hsmc3_writel(SETUP0, 0x00010002);
pm_init();
sysreg_write(EVBA, (unsigned long)&_evba);
asm volatile("csrf %0" : : "i"(SYSREG_EM_OFFSET));
/* Lock everything that mess with the flash in the icache */
for (p = __flashprog_start; p <= (__flashprog_end + CFG_ICACHE_LINESZ);
p += CFG_ICACHE_LINESZ)
asm volatile("cache %0, 0x02" : "=m"(*p) :: "memory");
return 0;
}
void prepare_to_boot(void)
{
/* Flush both caches and the write buffer */
asm volatile("cache %0[4], 010\n\t"
"cache %0[0], 000\n\t"
"sync 0" : : "r"(0) : "memory");
}
int do_reset(cmd_tbl_t *cmdtp, int flag, int argc, char *argv[])
{
/* This will reset the CPU core, caches, MMU and all internal busses */
__builtin_mtdr(8, 1 << 13); /* set DC:DBE */
__builtin_mtdr(8, 1 << 30); /* set DC:RES */
/* Flush the pipeline before we declare it a failure */
asm volatile("sub pc, pc, -4");
return -1;
}
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