target/linux/amazon-2.6/files/arch/mips/amazon/setup.c

   1 /*
   2  *       Copyright (C) 2004 Peng Liu <peng.liu@infineon.com>
   3  *       Copyright (C) 2007 John Crispin <blogic@openwrt.org>
   4  *       Copyright (C) 2007 Felix Fietkau <nbd@openwrt.org>
   5  *
   6  *   This program is free software; you can redistribute it and/or modify
   7  *   it under the terms of the GNU General Public License as published by
   8  *   the Free Software Foundation; either version 2 of the License, or
   9  *   (at your option) any later version.
  10  *
  11  *   This program is distributed in the hope that it will be useful,
  12  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *   GNU General Public License for more details.
  15  *
  16  *   You should have received a copy of the GNU General Public License
  17  *   along with this program; if not, write to the Free Software
  18  *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
  19  *
  20  */
  21
  22 #include <linux/init.h>
  23 #include <linux/sched.h>
  24 #include <linux/module.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/delay.h>
  27
  28 #include <asm/reboot.h>
  29 #include <asm/system.h>
  30 #include <asm/time.h>
  31 #include <asm/cpu.h>
  32 #include <asm/bootinfo.h>
  33 #include <asm/irq.h>
  34 #include <asm/mipsregs.h>
  35 #include <asm/amazon/amazon.h>
  36 #include <asm/amazon/irq.h>
  37 #include <asm/amazon/model.h>
  38
  39 extern void prom_printf(const char * fmt, ...);
  40 static void amazon_reboot_setup(void);
  41
  42 /* the CPU clock rate - lifted from u-boot */
  43 unsigned int amazon_get_cpu_hz(void)
  44 {
  45         /*-----------------------------------*/
  46         /**CGU CPU Clock Reduction Register***/
  47         /*-----------------------------------*/
  48         switch(amazon_readl(AMAZON_CGU_CPUCRD) & 0x3){
  49                 case 0:
  50                         /*divider ration 1/1, 235 MHz clock */
  51                         return 235000000;
  52                 case 1:
  53                         /*divider ration 2/3, 235 MHz clock, clock not accurate, here */
  54                         return 150000000;
  55                 case 2:
  56                         /*divider ration 1/2, 235 MHz clock */
  57                         return 117500000;
  58                 default:
  59                         /*divider ration 1/4, 235 MHz clock */
  60                         return 58750000;
  61         }
  62 }
  63
  64 /* the FPI clock rate - lifted from u-boot */
  65 unsigned int amazon_get_fpi_hz(void)
  66 {
  67         unsigned int  clkCPU;
  68         clkCPU = amazon_get_cpu_hz();
  69
  70         /*-------------------------------------*/
  71         /***CGU Clock Divider Select Register***/
  72         /*-------------------------------------*/
  73         switch (amazon_readl(AMAZON_CGU_DIV) & 0x3)
  74         {
  75                 case 1:
  76                         return clkCPU >> 1;
  77                 case 2:
  78                         return clkCPU >> 2;
  79                 default:
  80                         return clkCPU;
  81                 /* '11' is reserved */
  82         }
  83 }
  84
  85 /* this doesn't really belong here, but it's a convenient location */
  86 unsigned int amazon_get_cpu_ver(void)
  87 {
  88         static unsigned int cpu_ver = 0;
  89         if (cpu_ver == 0)
  90                 cpu_ver = amazon_readl(AMAZON_MCD_CHIPID) & 0xFFFFF000;
  91         return cpu_ver;
  92 }
  93
  94 void amazon_time_init(void)
  95 {
  96         mips_hpt_frequency = amazon_get_cpu_hz()/2;
  97         printk("mips_hpt_frequency:%d\n", mips_hpt_frequency);
  98 }
  99
 100 extern int hr_time_resolution;
 101
 102 /* ISR GPTU Timer 6 for high resolution timer */
 103 static void amazon_timer6_interrupt(int irq, void *dev_id)
 104 {
 105         timer_interrupt(AMAZON_TIMER6_INT, NULL);
 106 }
 107
 108 static struct irqaction hrt_irqaction = {
 109         .handler = amazon_timer6_interrupt,
 110         .flags = SA_INTERRUPT,
 111         .name = "hrt",
 112 };
 113
 114 /*
 115  * THe CPU counter for System timer, set to HZ
 116  * GPTU Timer 6 for high resolution timer, set to hr_time_resolution
 117  * Also misuse this routine to print out the CPU type and clock.
 118  */
 119 void __init plat_timer_setup(struct irqaction *irq)
 120 {
 121         /* cpu counter for timer interrupts */
 122         setup_irq(MIPS_CPU_TIMER_IRQ, irq);
 123
 124         /* enable the timer in the PMU */
 125         amazon_writel(amazon_readl(AMAZON_PMU_PWDCR)| AMAZON_PMU_PWDCR_GPT|AMAZON_PMU_PWDCR_FPI, AMAZON_PMU_PWDCR);
 126
 127         /* setup the GPTU for timer tick  f_fpi == f_gptu*/
 128         amazon_writel(0x0100, AMAZON_GPTU_CLC);
 129         amazon_writel(0xffff, AMAZON_GPTU_CAPREL);
 130         amazon_writel(0x80C0, AMAZON_GPTU_T6CON);
 131 }
 132
 133 void __init plat_mem_setup(void)
 134 {
 135         u32 chipid = 0;
 136         u32 part_no = 0;
 137
 138         chipid = amazon_readl(AMAZON_MCD_CHIPID);
 139         part_no = AMAZON_MCD_CHIPID_PART_NUMBER_GET(chipid);
 140
 141         if(part_no == AMAZON_CHIPID_YANGTSE){
 142                 prom_printf("Yangtse Version\n");
 143         } else if (part_no == AMAZON_CHIPID_STANDARD) {
 144                 prom_printf(SYSTEM_MODEL_NAME "\n");
 145         } else {
 146                 prom_printf("unknown version %8x\n",part_no);
 147         }
 148
 149         amazon_reboot_setup();
 150         board_time_init = amazon_time_init;
 151
 152         //stop reset TPE and DFE
 153         amazon_writel(0, AMAZON_RST_REQ);
 154         //clock
 155         amazon_writel(0x3fff, AMAZON_PMU_PWDCR);
 156         //reenable trace capability
 157         part_no = readl(AMAZON_BCU_ECON);
 158 }
 159
 160 static void amazon_machine_restart(char *command)
 161 {
 162     local_irq_disable();
 163     amazon_writel(AMAZON_RST_ALL, AMAZON_RST_REQ);
 164     for (;;) ;
 165 }
 166
 167 static void amazon_machine_halt(void)
 168 {
 169     printk(KERN_NOTICE "System halted.\n");
 170     local_irq_disable();
 171     for (;;) ;
 172 }
 173
 174 static void amazon_machine_power_off(void)
 175 {
 176         printk(KERN_NOTICE "Please turn off the power now.\n");
 177     local_irq_disable();
 178     for (;;) ;
 179 }
 180
 181 static void amazon_reboot_setup(void)
 182 {
 183         _machine_restart = amazon_machine_restart;
 184         _machine_halt = amazon_machine_halt;
 185         pm_power_off = amazon_machine_power_off;
 186 }