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/*
* Copyright (C) 2004 Peng Liu <peng.liu@infineon.com>
* Copyright (C) 2007 John Crispin <blogic@openwrt.org>
* Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
*
* 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 <linux/init.h>
#include <linux/sched.h>
#include <linux/module.h>
#include <linux/interrupt.h>
#include <linux/delay.h>
#include <asm/reboot.h>
#include <asm/system.h>
#include <asm/time.h>
#include <asm/cpu.h>
#include <asm/bootinfo.h>
#include <asm/irq.h>
#include <asm/mipsregs.h>
#include <asm/amazon/amazon.h>
#include <asm/amazon/irq.h>
#include <asm/amazon/model.h>
extern void prom_printf(const char * fmt, ...);
static void amazon_reboot_setup(void);
/* the CPU clock rate - lifted from u-boot */
unsigned int amazon_get_cpu_hz(void)
{
/*-----------------------------------*/
/**CGU CPU Clock Reduction Register***/
/*-----------------------------------*/
switch(amazon_readl(AMAZON_CGU_CPUCRD) & 0x3){
case 0:
/*divider ration 1/1, 235 MHz clock */
return 235000000;
case 1:
/*divider ration 2/3, 235 MHz clock, clock not accurate, here */
return 150000000;
case 2:
/*divider ration 1/2, 235 MHz clock */
return 117500000;
default:
/*divider ration 1/4, 235 MHz clock */
return 58750000;
}
}
/* the FPI clock rate - lifted from u-boot */
unsigned int amazon_get_fpi_hz(void)
{
unsigned int clkCPU;
clkCPU = amazon_get_cpu_hz();
/*-------------------------------------*/
/***CGU Clock Divider Select Register***/
/*-------------------------------------*/
switch (amazon_readl(AMAZON_CGU_DIV) & 0x3)
{
case 1:
return clkCPU >> 1;
case 2:
return clkCPU >> 2;
default:
return clkCPU;
/* '11' is reserved */
}
}
/* this doesn't really belong here, but it's a convenient location */
unsigned int amazon_get_cpu_ver(void)
{
static unsigned int cpu_ver = 0;
if (cpu_ver == 0)
cpu_ver = amazon_readl(AMAZON_MCD_CHIPID) & 0xFFFFF000;
return cpu_ver;
}
void amazon_time_init(void)
{
mips_hpt_frequency = amazon_get_cpu_hz()/2;
printk("mips_hpt_frequency:%d\n", mips_hpt_frequency);
}
extern int hr_time_resolution;
/* ISR GPTU Timer 6 for high resolution timer */
static void amazon_timer6_interrupt(int irq, void *dev_id)
{
timer_interrupt(AMAZON_TIMER6_INT, NULL);
}
static struct irqaction hrt_irqaction = {
.handler = amazon_timer6_interrupt,
.flags = SA_INTERRUPT,
.name = "hrt",
};
/*
* THe CPU counter for System timer, set to HZ
* GPTU Timer 6 for high resolution timer, set to hr_time_resolution
* Also misuse this routine to print out the CPU type and clock.
*/
void __init plat_timer_setup(struct irqaction *irq)
{
/* cpu counter for timer interrupts */
setup_irq(MIPS_CPU_TIMER_IRQ, irq);
/* enable the timer in the PMU */
amazon_writel(amazon_readl(AMAZON_PMU_PWDCR)| AMAZON_PMU_PWDCR_GPT|AMAZON_PMU_PWDCR_FPI, AMAZON_PMU_PWDCR);
/* setup the GPTU for timer tick f_fpi == f_gptu*/
amazon_writel(0x0100, AMAZON_GPTU_CLC);
amazon_writel(0xffff, AMAZON_GPTU_CAPREL);
amazon_writel(0x80C0, AMAZON_GPTU_T6CON);
}
void __init plat_mem_setup(void)
{
u32 chipid = 0;
u32 part_no = 0;
chipid = amazon_readl(AMAZON_MCD_CHIPID);
part_no = AMAZON_MCD_CHIPID_PART_NUMBER_GET(chipid);
if(part_no == AMAZON_CHIPID_YANGTSE){
prom_printf("Yangtse Version\n");
} else if (part_no == AMAZON_CHIPID_STANDARD) {
prom_printf(SYSTEM_MODEL_NAME "\n");
} else {
prom_printf("unknown version %8x\n",part_no);
}
amazon_reboot_setup();
board_time_init = amazon_time_init;
//stop reset TPE and DFE
amazon_writel(0, AMAZON_RST_REQ);
//clock
amazon_writel(0x3fff, AMAZON_PMU_PWDCR);
//reenable trace capability
part_no = readl(AMAZON_BCU_ECON);
}
static void amazon_machine_restart(char *command)
{
local_irq_disable();
amazon_writel(AMAZON_RST_ALL, AMAZON_RST_REQ);
for (;;) ;
}
static void amazon_machine_halt(void)
{
printk(KERN_NOTICE "System halted.\n");
local_irq_disable();
for (;;) ;
}
static void amazon_machine_power_off(void)
{
printk(KERN_NOTICE "Please turn off the power now.\n");
local_irq_disable();
for (;;) ;
}
static void amazon_reboot_setup(void)
{
_machine_restart = amazon_machine_restart;
_machine_halt = amazon_machine_halt;
pm_power_off = amazon_machine_power_off;
}
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