arch/m68k/mvme16x/config.c

   1 /*
   2  *  arch/m68k/mvme16x/config.c
   3  *
   4  *  Copyright (C) 1995 Richard Hirst [richard@sleepie.demon.co.uk]
   5  *
   6  * Based on:
   7  *
   8  *  linux/amiga/config.c
   9  *
  10  *  Copyright (C) 1993 Hamish Macdonald
  11  *
  12  * This file is subject to the terms and conditions of the GNU General Public
  13  * License.  See the file README.legal in the main directory of this archive
  14  * for more details.
  15  */
  16
  17 #include <linux/types.h>
  18 #include <linux/kernel.h>
  19 #include <linux/mm.h>
  20 #include <linux/tty.h>
  21 #include <linux/console.h>
  22 #include <linux/linkage.h>
  23 #include <linux/init.h>
  24 #include <linux/major.h>
  25 #include <linux/genhd.h>
  26 #include <linux/rtc.h>
  27 #include <linux/interrupt.h>
  28
  29 #include <asm/bootinfo.h>
  30 #include <asm/system.h>
  31 #include <asm/pgtable.h>
  32 #include <asm/setup.h>
  33 #include <asm/irq.h>
  34 #include <asm/traps.h>
  35 #include <asm/rtc.h>
  36 #include <asm/machdep.h>
  37 #include <asm/mvme16xhw.h>
  38
  39 extern t_bdid mvme_bdid;
  40
  41 static MK48T08ptr_t volatile rtc = (MK48T08ptr_t)MVME_RTC_BASE;
  42
  43 static void mvme16x_get_model(char *model);
  44 static int  mvme16x_get_hardware_list(char *buffer);
  45 extern void mvme16x_sched_init(irq_handler_t handler);
  46 extern unsigned long mvme16x_gettimeoffset (void);
  47 extern int mvme16x_hwclk (int, struct rtc_time *);
  48 extern int mvme16x_set_clock_mmss (unsigned long);
  49 extern void mvme16x_reset (void);
  50 extern void mvme16x_waitbut(void);
  51
  52 int bcd2int (unsigned char b);
  53
  54 /* Save tick handler routine pointer, will point to do_timer() in
  55  * kernel/sched.c, called via mvme16x_process_int() */
  56
  57 static irq_handler_t tick_handler;
  58
  59
  60 unsigned short mvme16x_config;
  61
  62
  63 int mvme16x_parse_bootinfo(const struct bi_record *bi)
  64 {
  65         if (bi->tag == BI_VME_TYPE || bi->tag == BI_VME_BRDINFO)
  66                 return 0;
  67         else
  68                 return 1;
  69 }
  70
  71 void mvme16x_reset(void)
  72 {
  73         printk ("\r\n\nCalled mvme16x_reset\r\n"
  74                         "\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r\r");
  75         /* The string of returns is to delay the reset until the whole
  76          * message is output.  Assert reset bit in GCSR */
  77         *(volatile char *)0xfff40107 = 0x80;
  78 }
  79
  80 static void mvme16x_get_model(char *model)
  81 {
  82     p_bdid p = &mvme_bdid;
  83     char suf[4];
  84
  85     suf[1] = p->brdsuffix[0];
  86     suf[2] = p->brdsuffix[1];
  87     suf[3] = '\0';
  88     suf[0] = suf[1] ? '-' : '\0';
  89
  90     sprintf(model, "Motorola MVME%x%s", p->brdno, suf);
  91 }
  92
  93
  94 static int mvme16x_get_hardware_list(char *buffer)
  95 {
  96     p_bdid p = &mvme_bdid;
  97     int len = 0;
  98
  99     if (p->brdno == 0x0162 || p->brdno == 0x0172)
 100     {
 101         unsigned char rev = *(unsigned char *)MVME162_VERSION_REG;
 102
 103         len += sprintf (buffer+len, "VMEchip2        %spresent\n",
 104                         rev & MVME16x_CONFIG_NO_VMECHIP2 ? "NOT " : "");
 105         len += sprintf (buffer+len, "SCSI interface  %spresent\n",
 106                         rev & MVME16x_CONFIG_NO_SCSICHIP ? "NOT " : "");
 107         len += sprintf (buffer+len, "Ethernet i/f    %spresent\n",
 108                         rev & MVME16x_CONFIG_NO_ETHERNET ? "NOT " : "");
 109     }
 110     else
 111         *buffer = '\0';
 112
 113     return (len);
 114 }
 115
 116 /*
 117  * This function is called during kernel startup to initialize
 118  * the mvme16x IRQ handling routines.  Should probably ensure
 119  * that the base vectors for the VMEChip2 and PCCChip2 are valid.
 120  */
 121
 122 static void __init mvme16x_init_IRQ (void)
 123 {
 124         m68k_setup_user_interrupt(VEC_USER, 192, NULL);
 125 }
 126
 127 #define pcc2chip        ((volatile u_char *)0xfff42000)
 128 #define PccSCCMICR      0x1d
 129 #define PccSCCTICR      0x1e
 130 #define PccSCCRICR      0x1f
 131
 132 void __init config_mvme16x(void)
 133 {
 134     p_bdid p = &mvme_bdid;
 135     char id[40];
 136
 137     mach_max_dma_address = 0xffffffff;
 138     mach_sched_init      = mvme16x_sched_init;
 139     mach_init_IRQ        = mvme16x_init_IRQ;
 140     mach_gettimeoffset   = mvme16x_gettimeoffset;
 141     mach_hwclk           = mvme16x_hwclk;
 142     mach_set_clock_mmss  = mvme16x_set_clock_mmss;
 143     mach_reset           = mvme16x_reset;
 144     mach_get_model       = mvme16x_get_model;
 145     mach_get_hardware_list = mvme16x_get_hardware_list;
 146
 147     /* Report board revision */
 148
 149     if (strncmp("BDID", p->bdid, 4))
 150     {
 151         printk ("\n\nBug call .BRD_ID returned garbage - giving up\n\n");
 152         while (1)
 153                 ;
 154     }
 155     /* Board type is only set by newer versions of vmelilo/tftplilo */
 156     if (vme_brdtype == 0)
 157         vme_brdtype = p->brdno;
 158
 159     mvme16x_get_model(id);
 160     printk ("\nBRD_ID: %s   BUG %x.%x %02x/%02x/%02x\n", id, p->rev>>4,
 161                                         p->rev&0xf, p->yr, p->mth, p->day);
 162     if (p->brdno == 0x0162 || p->brdno == 0x172)
 163     {
 164         unsigned char rev = *(unsigned char *)MVME162_VERSION_REG;
 165
 166         mvme16x_config = rev | MVME16x_CONFIG_GOT_SCCA;
 167
 168         printk ("MVME%x Hardware status:\n", p->brdno);
 169         printk ("    CPU Type           68%s040\n",
 170                         rev & MVME16x_CONFIG_GOT_FPU ? "" : "LC");
 171         printk ("    CPU clock          %dMHz\n",
 172                         rev & MVME16x_CONFIG_SPEED_32 ? 32 : 25);
 173         printk ("    VMEchip2           %spresent\n",
 174                         rev & MVME16x_CONFIG_NO_VMECHIP2 ? "NOT " : "");
 175         printk ("    SCSI interface     %spresent\n",
 176                         rev & MVME16x_CONFIG_NO_SCSICHIP ? "NOT " : "");
 177         printk ("    Ethernet interface %spresent\n",
 178                         rev & MVME16x_CONFIG_NO_ETHERNET ? "NOT " : "");
 179     }
 180     else
 181     {
 182         mvme16x_config = MVME16x_CONFIG_GOT_LP | MVME16x_CONFIG_GOT_CD2401;
 183
 184         /* Dont allow any interrupts from the CD2401 until the interrupt */
 185         /* handlers are installed                                        */
 186
 187         pcc2chip[PccSCCMICR] = 0x10;
 188         pcc2chip[PccSCCTICR] = 0x10;
 189         pcc2chip[PccSCCRICR] = 0x10;
 190     }
 191 }
 192
 193 static irqreturn_t mvme16x_abort_int (int irq, void *dev_id)
 194 {
 195         p_bdid p = &mvme_bdid;
 196         unsigned long *new = (unsigned long *)vectors;
 197         unsigned long *old = (unsigned long *)0xffe00000;
 198         volatile unsigned char uc, *ucp;
 199
 200         if (p->brdno == 0x0162 || p->brdno == 0x172)
 201         {
 202                 ucp = (volatile unsigned char *)0xfff42043;
 203                 uc = *ucp | 8;
 204                 *ucp = uc;
 205         }
 206         else
 207         {
 208                 *(volatile unsigned long *)0xfff40074 = 0x40000000;
 209         }
 210         *(new+4) = *(old+4);            /* Illegal instruction */
 211         *(new+9) = *(old+9);            /* Trace */
 212         *(new+47) = *(old+47);          /* Trap #15 */
 213
 214         if (p->brdno == 0x0162 || p->brdno == 0x172)
 215                 *(new+0x5e) = *(old+0x5e);      /* ABORT switch */
 216         else
 217                 *(new+0x6e) = *(old+0x6e);      /* ABORT switch */
 218         return IRQ_HANDLED;
 219 }
 220
 221 static irqreturn_t mvme16x_timer_int (int irq, void *dev_id)
 222 {
 223     *(volatile unsigned char *)0xfff4201b |= 8;
 224     return tick_handler(irq, dev_id);
 225 }
 226
 227 void mvme16x_sched_init (irq_handler_t timer_routine)
 228 {
 229     p_bdid p = &mvme_bdid;
 230     int irq;
 231
 232     tick_handler = timer_routine;
 233     /* Using PCCchip2 or MC2 chip tick timer 1 */
 234     *(volatile unsigned long *)0xfff42008 = 0;
 235     *(volatile unsigned long *)0xfff42004 = 10000;      /* 10ms */
 236     *(volatile unsigned char *)0xfff42017 |= 3;
 237     *(volatile unsigned char *)0xfff4201b = 0x16;
 238     if (request_irq(MVME16x_IRQ_TIMER, mvme16x_timer_int, 0,
 239                                 "timer", mvme16x_timer_int))
 240         panic ("Couldn't register timer int");
 241
 242     if (p->brdno == 0x0162 || p->brdno == 0x172)
 243         irq = MVME162_IRQ_ABORT;
 244     else
 245         irq = MVME167_IRQ_ABORT;
 246     if (request_irq(irq, mvme16x_abort_int, 0,
 247                                 "abort", mvme16x_abort_int))
 248         panic ("Couldn't register abort int");
 249 }
 250
 251
 252 /* This is always executed with interrupts disabled.  */
 253 unsigned long mvme16x_gettimeoffset (void)
 254 {
 255     return (*(volatile unsigned long *)0xfff42008);
 256 }
 257
 258 int bcd2int (unsigned char b)
 259 {
 260         return ((b>>4)*10 + (b&15));
 261 }
 262
 263 int mvme16x_hwclk(int op, struct rtc_time *t)
 264 {
 265 #warning check me!
 266         if (!op) {
 267                 rtc->ctrl = RTC_READ;
 268                 t->tm_year = bcd2int (rtc->bcd_year);
 269                 t->tm_mon  = bcd2int (rtc->bcd_mth);
 270                 t->tm_mday = bcd2int (rtc->bcd_dom);
 271                 t->tm_hour = bcd2int (rtc->bcd_hr);
 272                 t->tm_min  = bcd2int (rtc->bcd_min);
 273                 t->tm_sec  = bcd2int (rtc->bcd_sec);
 274                 rtc->ctrl = 0;
 275         }
 276         return 0;
 277 }
 278
 279 int mvme16x_set_clock_mmss (unsigned long nowtime)
 280 {
 281         return 0;
 282 }
 283