arch/ppc/syslib/ppc83xx_setup.c

   1 /*
   2  * arch/ppc/syslib/ppc83xx_setup.c
   3  *
   4  * MPC83XX common board code
   5  *
   6  * Maintainer: Kumar Gala <kumar.gala@freescale.com>
   7  *
   8  * Copyright 2005 Freescale Semiconductor Inc.
   9  *
  10  * This program is free software; you can redistribute  it and/or modify it
  11  * under  the terms of  the GNU General  Public License as published by the
  12  * Free Software Foundation;  either version 2 of the  License, or (at your
  13  * option) any later version.
  14  */
  15
  16 #include <linux/config.h>
  17 #include <linux/types.h>
  18 #include <linux/module.h>
  19 #include <linux/init.h>
  20 #include <linux/pci.h>
  21 #include <linux/serial.h>
  22 #include <linux/tty.h>  /* for linux/serial_core.h */
  23 #include <linux/serial_core.h>
  24 #include <linux/serial_8250.h>
  25
  26 #include <asm/prom.h>
  27 #include <asm/time.h>
  28 #include <asm/mpc83xx.h>
  29 #include <asm/mmu.h>
  30 #include <asm/ppc_sys.h>
  31 #include <asm/kgdb.h>
  32
  33 #include <syslib/ppc83xx_setup.h>
  34
  35 phys_addr_t immrbar;
  36
  37 /* Return the amount of memory */
  38 unsigned long __init
  39 mpc83xx_find_end_of_memory(void)
  40 {
  41         bd_t *binfo;
  42
  43         binfo = (bd_t *) __res;
  44
  45         return binfo->bi_memsize;
  46 }
  47
  48 long __init
  49 mpc83xx_time_init(void)
  50 {
  51 #define SPCR_OFFS   0x00000110
  52 #define SPCR_TBEN   0x00400000
  53
  54         bd_t *binfo = (bd_t *)__res;
  55         u32 *spcr = ioremap(binfo->bi_immr_base + SPCR_OFFS, 4);
  56
  57         *spcr |= SPCR_TBEN;
  58
  59         iounmap(spcr);
  60
  61         return 0;
  62 }
  63
  64 /* The decrementer counts at the system (internal) clock freq divided by 4 */
  65 void __init
  66 mpc83xx_calibrate_decr(void)
  67 {
  68         bd_t *binfo = (bd_t *) __res;
  69         unsigned int freq, divisor;
  70
  71         freq = binfo->bi_busfreq;
  72         divisor = 4;
  73         tb_ticks_per_jiffy = freq / HZ / divisor;
  74         tb_to_us = mulhwu_scale_factor(freq / divisor, 1000000);
  75 }
  76
  77 #ifdef CONFIG_SERIAL_8250
  78 void __init
  79 mpc83xx_early_serial_map(void)
  80 {
  81 #if defined(CONFIG_SERIAL_TEXT_DEBUG) || defined(CONFIG_KGDB)
  82         struct uart_port serial_req;
  83 #endif
  84         struct plat_serial8250_port *pdata;
  85         bd_t *binfo = (bd_t *) __res;
  86         pdata = (struct plat_serial8250_port *) ppc_sys_get_pdata(MPC83xx_DUART);
  87
  88         /* Setup serial port access */
  89         pdata[0].uartclk = binfo->bi_busfreq;
  90         pdata[0].mapbase += binfo->bi_immr_base;
  91         pdata[0].membase = ioremap(pdata[0].mapbase, 0x100);
  92
  93 #if defined(CONFIG_SERIAL_TEXT_DEBUG) || defined(CONFIG_KGDB)
  94         memset(&serial_req, 0, sizeof (serial_req));
  95         serial_req.iotype = SERIAL_IO_MEM;
  96         serial_req.mapbase = pdata[0].mapbase;
  97         serial_req.membase = pdata[0].membase;
  98         serial_req.regshift = 0;
  99
 100         gen550_init(0, &serial_req);
 101 #endif
 102
 103         pdata[1].uartclk = binfo->bi_busfreq;
 104         pdata[1].mapbase += binfo->bi_immr_base;
 105         pdata[1].membase = ioremap(pdata[1].mapbase, 0x100);
 106
 107 #if defined(CONFIG_SERIAL_TEXT_DEBUG) || defined(CONFIG_KGDB)
 108         /* Assume gen550_init() doesn't modify serial_req */
 109         serial_req.mapbase = pdata[1].mapbase;
 110         serial_req.membase = pdata[1].membase;
 111
 112         gen550_init(1, &serial_req);
 113 #endif
 114 }
 115 #endif
 116
 117 void
 118 mpc83xx_restart(char *cmd)
 119 {
 120         local_irq_disable();
 121         for(;;);
 122 }
 123
 124 void
 125 mpc83xx_power_off(void)
 126 {
 127         local_irq_disable();
 128         for(;;);
 129 }
 130
 131 void
 132 mpc83xx_halt(void)
 133 {
 134         local_irq_disable();
 135         for(;;);
 136 }
 137
 138 /* PCI SUPPORT DOES NOT EXIT, MODEL after ppc85xx_setup.c */