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   1 /*
   2  * arch/powerpc/platforms/83xx/mpc834x_sys.c
   3  *
   4  * MPC834x SYS board specific routines
   5  *
   6  * Maintainer: Kumar Gala <galak@kernel.crashing.org>
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #include <linux/config.h>
  15 #include <linux/stddef.h>
  16 #include <linux/kernel.h>
  17 #include <linux/init.h>
  18 #include <linux/errno.h>
  19 #include <linux/reboot.h>
  20 #include <linux/pci.h>
  21 #include <linux/kdev_t.h>
  22 #include <linux/major.h>
  23 #include <linux/console.h>
  24 #include <linux/delay.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/root_dev.h>
  27
  28 #include <asm/system.h>
  29 #include <asm/atomic.h>
  30 #include <asm/time.h>
  31 #include <asm/io.h>
  32 #include <asm/machdep.h>
  33 #include <asm/ipic.h>
  34 #include <asm/bootinfo.h>
  35 #include <asm/irq.h>
  36 #include <asm/prom.h>
  37 #include <asm/udbg.h>
  38 #include <sysdev/fsl_soc.h>
  39
  40 #include "mpc83xx.h"
  41
  42 #ifndef CONFIG_PCI
  43 unsigned long isa_io_base = 0;
  44 unsigned long isa_mem_base = 0;
  45 #endif
  46
  47 #ifdef CONFIG_PCI
  48 static int
  49 mpc83xx_map_irq(struct pci_dev *dev, unsigned char idsel, unsigned char pin)
  50 {
  51         static char pci_irq_table[][4] =
  52             /*
  53              *      PCI IDSEL/INTPIN->INTLINE
  54              *       A      B      C      D
  55              */
  56         {
  57                 {PIRQA, PIRQB, PIRQC, PIRQD},   /* idsel 0x11 */
  58                 {PIRQC, PIRQD, PIRQA, PIRQB},   /* idsel 0x12 */
  59                 {PIRQD, PIRQA, PIRQB, PIRQC},   /* idsel 0x13 */
  60                 {0, 0, 0, 0},
  61                 {PIRQA, PIRQB, PIRQC, PIRQD},   /* idsel 0x15 */
  62                 {PIRQD, PIRQA, PIRQB, PIRQC},   /* idsel 0x16 */
  63                 {PIRQC, PIRQD, PIRQA, PIRQB},   /* idsel 0x17 */
  64                 {PIRQB, PIRQC, PIRQD, PIRQA},   /* idsel 0x18 */
  65                 {0, 0, 0, 0},                   /* idsel 0x19 */
  66                 {0, 0, 0, 0},                   /* idsel 0x20 */
  67         };
  68
  69         const long min_idsel = 0x11, max_idsel = 0x20, irqs_per_slot = 4;
  70         return PCI_IRQ_TABLE_LOOKUP;
  71 }
  72 #endif                          /* CONFIG_PCI */
  73
  74 /* ************************************************************************
  75  *
  76  * Setup the architecture
  77  *
  78  */
  79 static void __init mpc834x_sys_setup_arch(void)
  80 {
  81         struct device_node *np;
  82
  83         if (ppc_md.progress)
  84                 ppc_md.progress("mpc834x_sys_setup_arch()", 0);
  85
  86         np = of_find_node_by_type(NULL, "cpu");
  87         if (np != 0) {
  88                 unsigned int *fp =
  89                     (int *)get_property(np, "clock-frequency", NULL);
  90                 if (fp != 0)
  91                         loops_per_jiffy = *fp / HZ;
  92                 else
  93                         loops_per_jiffy = 50000000 / HZ;
  94                 of_node_put(np);
  95         }
  96 #ifdef CONFIG_PCI
  97         for (np = NULL; (np = of_find_node_by_type(np, "pci")) != NULL;)
  98                 add_bridge(np);
  99
 100         ppc_md.pci_swizzle = common_swizzle;
 101         ppc_md.pci_map_irq = mpc83xx_map_irq;
 102         ppc_md.pci_exclude_device = mpc83xx_exclude_device;
 103 #endif
 104
 105 #ifdef  CONFIG_ROOT_NFS
 106         ROOT_DEV = Root_NFS;
 107 #else
 108         ROOT_DEV = Root_HDA1;
 109 #endif
 110 }
 111
 112 void __init mpc834x_sys_init_IRQ(void)
 113 {
 114         u8 senses[8] = {
 115                 0,                      /* EXT 0 */
 116                 IRQ_SENSE_LEVEL,        /* EXT 1 */
 117                 IRQ_SENSE_LEVEL,        /* EXT 2 */
 118                 0,                      /* EXT 3 */
 119 #ifdef CONFIG_PCI
 120                 IRQ_SENSE_LEVEL,        /* EXT 4 */
 121                 IRQ_SENSE_LEVEL,        /* EXT 5 */
 122                 IRQ_SENSE_LEVEL,        /* EXT 6 */
 123                 IRQ_SENSE_LEVEL,        /* EXT 7 */
 124 #else
 125                 0,                      /* EXT 4 */
 126                 0,                      /* EXT 5 */
 127                 0,                      /* EXT 6 */
 128                 0,                      /* EXT 7 */
 129 #endif
 130         };
 131
 132         ipic_init(get_immrbase() + 0x00700, 0, 0, senses, 8);
 133
 134         /* Initialize the default interrupt mapping priorities,
 135          * in case the boot rom changed something on us.
 136          */
 137         ipic_set_default_priority();
 138 }
 139
 140 #if defined(CONFIG_I2C_MPC) && defined(CONFIG_SENSORS_DS1374)
 141 extern ulong ds1374_get_rtc_time(void);
 142 extern int ds1374_set_rtc_time(ulong);
 143
 144 static int __init mpc834x_rtc_hookup(void)
 145 {
 146         struct timespec tv;
 147
 148         ppc_md.get_rtc_time = ds1374_get_rtc_time;
 149         ppc_md.set_rtc_time = ds1374_set_rtc_time;
 150
 151         tv.tv_nsec = 0;
 152         tv.tv_sec = (ppc_md.get_rtc_time) ();
 153         do_settimeofday(&tv);
 154
 155         return 0;
 156 }
 157
 158 late_initcall(mpc834x_rtc_hookup);
 159 #endif
 160
 161 /*
 162  * Called very early, MMU is off, device-tree isn't unflattened
 163  */
 164 static int __init mpc834x_sys_probe(void)
 165 {
 166         /* We always match for now, eventually we should look at the flat
 167            dev tree to ensure this is the board we are suppose to run on
 168         */
 169         return 1;
 170 }
 171
 172 define_machine(mpc834x_sys) {
 173         .name                   = "MPC834x SYS",
 174         .probe                  = mpc834x_sys_probe,
 175         .setup_arch             = mpc834x_sys_setup_arch,
 176         .init_IRQ               = mpc834x_sys_init_IRQ,
 177         .get_irq                = ipic_get_irq,
 178         .restart                = mpc83xx_restart,
 179         .time_init              = mpc83xx_time_init,
 180         .calibrate_decr         = generic_calibrate_decr,
 181         .progress               = udbg_progress,
 182 };