arch/ppc/kernel/oak_setup.c

   1 /*
   2  *
   3  *    Copyright (c) 1999 Grant Erickson <grant@lcse.umn.edu>
   4  *
   5  *    Module name: oak_setup.c
   6  *
   7  *    Description:
   8  *      Architecture- / platform-specific boot-time initialization code for
   9  *      the IBM PowerPC 403GCX "Oak" evaluation board. Adapted from original
  10  *      code by Gary Thomas, Cort Dougan <cort@fsmlabs.com>, and Dan Malek
  11  *      <dan@net4x.com>.
  12  *
  13  */
  14
  15 #include <linux/config.h>
  16 #include <linux/init.h>
  17 #include <linux/smp.h>
  18 #include <linux/threads.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/param.h>
  21 #include <linux/string.h>
  22
  23 #include <asm/processor.h>
  24 #include <asm/board.h>
  25 #include <asm/machdep.h>
  26 #include <asm/page.h>
  27
  28 #include "local_irq.h"
  29 #include "ppc4xx_pic.h"
  30 #include "time.h"
  31 #include "oak_setup.h"
  32
  33 /* Function Prototypes */
  34
  35 extern void abort(void);
  36
  37 /* Global Variables */
  38
  39 unsigned char __res[sizeof(bd_t)];
  40
  41
  42 /*
  43  * void __init oak_init()
  44  *
  45  * Description:
  46  *   This routine...
  47  *
  48  * Input(s):
  49  *   r3 - Optional pointer to a board information structure.
  50  *   r4 - Optional pointer to the physical starting address of the init RAM
  51  *        disk.
  52  *   r5 - Optional pointer to the physical ending address of the init RAM
  53  *        disk.
  54  *   r6 - Optional pointer to the physical starting address of any kernel
  55  *        command-line parameters.
  56  *   r7 - Optional pointer to the physical ending address of any kernel
  57  *        command-line parameters.
  58  *
  59  * Output(s):
  60  *   N/A
  61  *
  62  * Returns:
  63  *   N/A
  64  *
  65  */
  66 void __init
  67 oak_init(unsigned long r3, unsigned long r4, unsigned long r5,
  68          unsigned long r6, unsigned long r7)
  69 {
  70         /*
  71          * If we were passed in a board information, copy it into the
  72          * residual data area.
  73          */
  74         if (r3) {
  75                 memcpy((void *)__res, (void *)(r3 + KERNELBASE), sizeof(bd_t));
  76         }
  77
  78 #if defined(CONFIG_BLK_DEV_INITRD)
  79         /*
  80          * If the init RAM disk has been configured in, and there's a valid
  81          * starting address for it, set it up.
  82          */
  83         if (r4) {
  84                 initrd_start = r4 + KERNELBASE;
  85                 initrd_end = r5 + KERNELBASE;
  86         }
  87 #endif /* CONFIG_BLK_DEV_INITRD */
  88
  89         /* Copy the kernel command line arguments to a safe place. */
  90
  91         if (r6) {
  92                 *(char *)(r7 + KERNELBASE) = 0;
  93                 strcpy(cmd_line, (char *)(r6 + KERNELBASE));
  94         }
  95
  96         /* Initialize machine-dependency vectors */
  97
  98         ppc_md.setup_arch        = oak_setup_arch;
  99         ppc_md.setup_residual    = oak_setup_residual;
 100         ppc_md.get_cpuinfo       = NULL;
 101         ppc_md.irq_cannonicalize = NULL;
 102         ppc_md.init_IRQ          = oak_init_IRQ;
 103         ppc_md.get_irq           = oak_get_irq;
 104         ppc_md.init              = NULL;
 105
 106         ppc_md.restart           = oak_restart;
 107         ppc_md.power_off         = oak_power_off;
 108         ppc_md.halt              = oak_halt;
 109
 110         ppc_md.time_init         = oak_time_init;
 111         ppc_md.set_rtc_time      = oak_set_rtc_time;
 112         ppc_md.get_rtc_time      = oak_get_rtc_time;
 113         ppc_md.calibrate_decr    = oak_calibrate_decr;
 114
 115         ppc_md.kbd_setkeycode    = NULL;
 116         ppc_md.kbd_getkeycode    = NULL;
 117         ppc_md.kbd_translate     = NULL;
 118         ppc_md.kbd_unexpected_up = NULL;
 119         ppc_md.kbd_leds          = NULL;
 120         ppc_md.kbd_init_hw       = NULL;
 121
 122 #if defined(CONFIG_MAGIC_SYSRQ)
 123         ppc_md.kbd_sysrq_xlate   = NULL;
 124 #endif
 125
 126         return;
 127 }
 128
 129 /*
 130  * Document me.
 131  */
 132 void __init
 133 oak_setup_arch(void)
 134 {
 135         /* XXX - Implement me */
 136 }
 137
 138 /*
 139  * int oak_setup_residual()
 140  *
 141  * Description:
 142  *   This routine pretty-prints the platform's internal CPU and bus clock
 143  *   frequencies into the buffer for usage in /proc/cpuinfo.
 144  *
 145  * Input(s):
 146  *  *buffer - Buffer into which CPU and bus clock frequencies are to be
 147  *            printed.
 148  *
 149  * Output(s):
 150  *  *buffer - Buffer with the CPU and bus clock frequencies.
 151  *
 152  * Returns:
 153  *   The number of bytes copied into 'buffer' if OK, otherwise zero or less
 154  *   on error.
 155  */
 156 int
 157 oak_setup_residual(char *buffer)
 158 {
 159         int len = 0;
 160         bd_t *bp = (bd_t *)__res;
 161
 162         len += sprintf(len + buffer,
 163                        "clock\t\t: %dMHz\n"
 164                        "bus clock\t\t: %dMHz\n",
 165                        bp->bi_intfreq / 1000000,
 166                        bp->bi_busfreq / 1000000);
 167
 168         return (len);
 169 }
 170
 171 /*
 172  * Document me.
 173  */
 174 void __init
 175 oak_init_IRQ(void)
 176 {
 177         int i;
 178
 179         ppc4xx_pic_init();
 180
 181         for (i = 0; i < NR_IRQS; i++) {
 182                 irq_desc[i].handler = ppc4xx_pic;
 183         }
 184
 185         return;
 186 }
 187
 188 /*
 189  * Document me.
 190  */
 191 int
 192 oak_get_irq(struct pt_regs *regs)
 193 {
 194         return (ppc4xx_pic_get_irq(regs));
 195 }
 196
 197 /*
 198  * Document me.
 199  */
 200 void
 201 oak_restart(char *cmd)
 202 {
 203         abort();
 204 }
 205
 206 /*
 207  * Document me.
 208  */
 209 void
 210 oak_power_off(void)
 211 {
 212         oak_restart(NULL);
 213 }
 214
 215 /*
 216  * Document me.
 217  */
 218 void
 219 oak_halt(void)
 220 {
 221         oak_restart(NULL);
 222 }
 223
 224 /*
 225  * Document me.
 226  */
 227 void __init
 228 oak_time_init(void)
 229 {
 230         /* XXX - Implement me */
 231 }
 232
 233 /*
 234  * Document me.
 235  */
 236 int __init
 237 oak_set_rtc_time(unsigned long time)
 238 {
 239         /* XXX - Implement me */
 240
 241         return (0);
 242 }
 243
 244 /*
 245  * Document me.
 246  */
 247 unsigned long __init
 248 oak_get_rtc_time(void)
 249 {
 250         /* XXX - Implement me */
 251
 252         return (0);
 253 }
 254
 255 /*
 256  * void __init oak_calibrate_decr()
 257  *
 258  * Description:
 259  *   This routine retrieves the internal processor frequency from the board
 260  *   information structure, sets up the kernel timer decrementer based on
 261  *   that value, enables the 403 programmable interval timer (PIT) and sets
 262  *   it up for auto-reload.
 263  *
 264  * Input(s):
 265  *   N/A
 266  *
 267  * Output(s):
 268  *   N/A
 269  *
 270  * Returns:
 271  *   N/A
 272  *
 273  */
 274 void __init
 275 oak_calibrate_decr(void)
 276 {
 277         unsigned int freq;
 278         bd_t *bip = (bd_t *)__res;
 279
 280         freq = bip->bi_intfreq;
 281
 282         decrementer_count = freq / HZ;
 283         count_period_num = 1;
 284         count_period_den = freq;
 285
 286         /* Enable the PIT and set auto-reload of its value */
 287
 288         mtspr(SPRN_TCR, TCR_PIE | TCR_ARE);
 289
 290         /* Clear any pending timer interrupts */
 291
 292         mtspr(SPRN_TSR, TSR_ENW | TSR_WIS | TSR_PIS | TSR_FIS);
 293 }