arch/ppc/syslib/ibm44x_common.c

   1 /*
   2  * arch/ppc/syslib/ibm44x_common.c
   3  *
   4  * PPC44x system library
   5  *
   6  * Matt Porter <mporter@kernel.crashing.org>
   7  * Copyright 2002-2004 MontaVista Software Inc.
   8  *
   9  * Eugene Surovegin <eugene.surovegin@zultys.com> or <ebs@ebshome.net>
  10  * Copyright (c) 2003, 2004 Zultys Technologies
  11  *
  12  * This program is free software; you can redistribute  it and/or modify it
  13  * under  the terms of  the GNU General  Public License as published by the
  14  * Free Software Foundation;  either version 2 of the  License, or (at your
  15  * option) any later version.
  16  *
  17  */
  18 #include <linux/config.h>
  19 #include <linux/time.h>
  20 #include <linux/types.h>
  21 #include <linux/serial.h>
  22
  23 #include <asm/ibm44x.h>
  24 #include <asm/mmu.h>
  25 #include <asm/machdep.h>
  26 #include <asm/time.h>
  27 #include <asm/ppc4xx_pic.h>
  28 #include <asm/param.h>
  29
  30 #include <syslib/gen550.h>
  31
  32 phys_addr_t fixup_bigphys_addr(phys_addr_t addr, phys_addr_t size)
  33 {
  34         phys_addr_t page_4gb = 0;
  35
  36         /*
  37          * Trap the least significant 32-bit portions of an
  38          * address in the 440's 36-bit address space.  Fix
  39          * them up with the appropriate ERPN
  40          */
  41         if ((addr >= PPC44x_IO_LO) && (addr < PPC44x_IO_HI))
  42                 page_4gb = PPC44x_IO_PAGE;
  43         else if ((addr >= PPC44x_PCICFG_LO) && (addr < PPC44x_PCICFG_HI))
  44                 page_4gb = PPC44x_PCICFG_PAGE;
  45         else if ((addr >= PPC44x_PCIMEM_LO) && (addr < PPC44x_PCIMEM_HI))
  46                 page_4gb = PPC44x_PCIMEM_PAGE;
  47
  48         return (page_4gb | addr);
  49 };
  50
  51 void __init ibm44x_calibrate_decr(unsigned int freq)
  52 {
  53         tb_ticks_per_jiffy = freq / HZ;
  54         tb_to_us = mulhwu_scale_factor(freq, 1000000);
  55
  56         /* Set the time base to zero */
  57         mtspr(SPRN_TBWL, 0);
  58         mtspr(SPRN_TBWU, 0);
  59
  60         /* Clear any pending timer interrupts */
  61         mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_DIS | TSR_FIS);
  62
  63         /* Enable decrementer interrupt */
  64         mtspr(SPRN_TCR, TCR_DIE);
  65 }
  66
  67 extern void abort(void);
  68
  69 static void ibm44x_restart(char *cmd)
  70 {
  71         local_irq_disable();
  72         abort();
  73 }
  74
  75 static void ibm44x_power_off(void)
  76 {
  77         local_irq_disable();
  78         for(;;);
  79 }
  80
  81 static void ibm44x_halt(void)
  82 {
  83         local_irq_disable();
  84         for(;;);
  85 }
  86
  87 /*
  88  * Read the 44x memory controller to get size of system memory.
  89  */
  90 static unsigned long __init ibm44x_find_end_of_memory(void)
  91 {
  92         u32 i, bank_config;
  93         u32 mem_size = 0;
  94
  95         for (i=0; i<4; i++)
  96         {
  97                 switch (i)
  98                 {
  99                         case 0:
 100                                 mtdcr(DCRN_SDRAM0_CFGADDR, SDRAM0_B0CR);
 101                                 break;
 102                         case 1:
 103                                 mtdcr(DCRN_SDRAM0_CFGADDR, SDRAM0_B1CR);
 104                                 break;
 105                         case 2:
 106                                 mtdcr(DCRN_SDRAM0_CFGADDR, SDRAM0_B2CR);
 107                                 break;
 108                         case 3:
 109                                 mtdcr(DCRN_SDRAM0_CFGADDR, SDRAM0_B3CR);
 110                                 break;
 111                 }
 112
 113                 bank_config = mfdcr(DCRN_SDRAM0_CFGDATA);
 114
 115                 if (!(bank_config & SDRAM_CONFIG_BANK_ENABLE))
 116                         continue;
 117                 switch (SDRAM_CONFIG_BANK_SIZE(bank_config))
 118                 {
 119                         case SDRAM_CONFIG_SIZE_8M:
 120                                 mem_size += PPC44x_MEM_SIZE_8M;
 121                                 break;
 122                         case SDRAM_CONFIG_SIZE_16M:
 123                                 mem_size += PPC44x_MEM_SIZE_16M;
 124                                 break;
 125                         case SDRAM_CONFIG_SIZE_32M:
 126                                 mem_size += PPC44x_MEM_SIZE_32M;
 127                                 break;
 128                         case SDRAM_CONFIG_SIZE_64M:
 129                                 mem_size += PPC44x_MEM_SIZE_64M;
 130                                 break;
 131                         case SDRAM_CONFIG_SIZE_128M:
 132                                 mem_size += PPC44x_MEM_SIZE_128M;
 133                                 break;
 134                         case SDRAM_CONFIG_SIZE_256M:
 135                                 mem_size += PPC44x_MEM_SIZE_256M;
 136                                 break;
 137                         case SDRAM_CONFIG_SIZE_512M:
 138                                 mem_size += PPC44x_MEM_SIZE_512M;
 139                                 break;
 140                 }
 141         }
 142         return mem_size;
 143 }
 144
 145 static void __init ibm44x_init_irq(void)
 146 {
 147         int i;
 148
 149         ppc4xx_pic_init();
 150
 151         for (i = 0; i < NR_IRQS; i++)
 152                 irq_desc[i].handler = ppc4xx_pic;
 153 }
 154
 155 void __init ibm44x_platform_init(void)
 156 {
 157         ppc_md.init_IRQ = ibm44x_init_irq;
 158         ppc_md.find_end_of_memory = ibm44x_find_end_of_memory;
 159         ppc_md.restart = ibm44x_restart;
 160         ppc_md.power_off = ibm44x_power_off;
 161         ppc_md.halt = ibm44x_halt;
 162
 163 #ifdef CONFIG_SERIAL_TEXT_DEBUG
 164         ppc_md.progress = gen550_progress;
 165 #endif /* CONFIG_SERIAL_TEXT_DEBUG */
 166 #ifdef CONFIG_KGDB
 167         ppc_md.kgdb_map_scc = gen550_kgdb_map_scc;
 168 #endif
 169
 170         /*
 171          * The Abatron BDI JTAG debugger does not tolerate others
 172          * mucking with the debug registers.
 173          */
 174 #if !defined(CONFIG_BDI_SWITCH)
 175         /* Enable internal debug mode */
 176         mtspr(SPRN_DBCR0, (DBCR0_IDM));
 177
 178         /* Clear any residual debug events */
 179         mtspr(SPRN_DBSR, 0xffffffff);
 180 #endif
 181 }
 182