arch/m68k/q40/config.c

   1 /*
   2  *  arch/m68k/q40/config.c
   3  *
   4  *  Copyright (C) 1999 Richard Zidlicky
   5  *
   6  * originally based on:
   7  *
   8  *  linux/bvme/config.c
   9  *
  10  * This file is subject to the terms and conditions of the GNU General Public
  11  * License.  See the file README.legal in the main directory of this archive
  12  * for more details.
  13  */
  14
  15 #include <linux/types.h>
  16 #include <linux/kernel.h>
  17 #include <linux/mm.h>
  18 #include <linux/tty.h>
  19 #include <linux/console.h>
  20 #include <linux/linkage.h>
  21 #include <linux/init.h>
  22 #include <linux/major.h>
  23 #include <linux/serial_reg.h>
  24 #include <linux/rtc.h>
  25 #include <linux/vt_kern.h>
  26
  27 #include <asm/io.h>
  28 #include <asm/rtc.h>
  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/machdep.h>
  36 #include <asm/q40_master.h>
  37
  38 extern irqreturn_t q40_process_int (int level, struct pt_regs *regs);
  39 extern void q40_init_IRQ (void);
  40 static void q40_get_model(char *model);
  41 static int  q40_get_hardware_list(char *buffer);
  42 extern void q40_sched_init(irq_handler_t handler);
  43
  44 extern unsigned long q40_gettimeoffset (void);
  45 extern int q40_hwclk (int, struct rtc_time *);
  46 extern unsigned int q40_get_ss (void);
  47 extern int q40_set_clock_mmss (unsigned long);
  48 static int q40_get_rtc_pll(struct rtc_pll_info *pll);
  49 static int q40_set_rtc_pll(struct rtc_pll_info *pll);
  50 extern void q40_reset (void);
  51 void q40_halt(void);
  52 extern void q40_waitbut(void);
  53 void q40_set_vectors (void);
  54
  55 extern void q40_mksound(unsigned int /*freq*/, unsigned int /*ticks*/ );
  56
  57 extern char m68k_debug_device[];
  58 static void q40_mem_console_write(struct console *co, const char *b,
  59                                     unsigned int count);
  60
  61 extern int ql_ticks;
  62
  63 static struct console q40_console_driver = {
  64         .name =         "debug",
  65         .flags =        CON_PRINTBUFFER,
  66         .index =        -1,
  67 };
  68
  69
  70 /* early debugging function:*/
  71 extern char *q40_mem_cptr; /*=(char *)0xff020000;*/
  72 static int _cpleft;
  73
  74 static void q40_mem_console_write(struct console *co, const char *s,
  75                                   unsigned int count)
  76 {
  77   char *p=(char *)s;
  78
  79   if (count<_cpleft)
  80     while (count-- >0){
  81       *q40_mem_cptr=*p++;
  82       q40_mem_cptr+=4;
  83       _cpleft--;
  84     }
  85 }
  86 #if 0
  87 void printq40(char *str)
  88 {
  89   int l=strlen(str);
  90   char *p=q40_mem_cptr;
  91
  92   while (l-- >0 && _cpleft-- >0)
  93     {
  94       *p=*str++;
  95       p+=4;
  96     }
  97   q40_mem_cptr=p;
  98 }
  99 #endif
 100
 101 static int halted=0;
 102
 103 #ifdef CONFIG_HEARTBEAT
 104 static void q40_heartbeat(int on)
 105 {
 106   if (halted) return;
 107
 108   if (on)
 109     Q40_LED_ON();
 110   else
 111     Q40_LED_OFF();
 112 }
 113 #endif
 114
 115 void q40_reset(void)
 116 {
 117         halted=1;
 118         printk ("\n\n*******************************************\n"
 119                 "Called q40_reset : press the RESET button!! \n"
 120                 "*******************************************\n");
 121         Q40_LED_ON();
 122         while(1) ;
 123 }
 124 void q40_halt(void)
 125 {
 126         halted=1;
 127         printk ("\n\n*******************\n"
 128                     "  Called q40_halt\n"
 129                     "*******************\n");
 130         Q40_LED_ON();
 131         while(1) ;
 132 }
 133
 134 static void q40_get_model(char *model)
 135 {
 136     sprintf(model, "Q40");
 137 }
 138
 139 /* No hardware options on Q40? */
 140
 141 static int q40_get_hardware_list(char *buffer)
 142 {
 143     *buffer = '\0';
 144     return 0;
 145 }
 146
 147 static unsigned int serports[]={0x3f8,0x2f8,0x3e8,0x2e8,0};
 148 void q40_disable_irqs(void)
 149 {
 150   unsigned i,j;
 151
 152   j=0;
 153   while((i=serports[j++])) outb(0,i+UART_IER);
 154   master_outb(0,EXT_ENABLE_REG);
 155   master_outb(0,KEY_IRQ_ENABLE_REG);
 156 }
 157
 158 void __init config_q40(void)
 159 {
 160     mach_sched_init      = q40_sched_init;
 161
 162     mach_init_IRQ        = q40_init_IRQ;
 163     mach_gettimeoffset   = q40_gettimeoffset;
 164     mach_hwclk           = q40_hwclk;
 165     mach_get_ss          = q40_get_ss;
 166     mach_get_rtc_pll     = q40_get_rtc_pll;
 167     mach_set_rtc_pll     = q40_set_rtc_pll;
 168     mach_set_clock_mmss  = q40_set_clock_mmss;
 169
 170     mach_reset           = q40_reset;
 171     mach_get_model       = q40_get_model;
 172     mach_get_hardware_list = q40_get_hardware_list;
 173
 174 #if defined(CONFIG_INPUT_M68K_BEEP) || defined(CONFIG_INPUT_M68K_BEEP_MODULE)
 175     mach_beep            = q40_mksound;
 176 #endif
 177 #ifdef CONFIG_HEARTBEAT
 178     mach_heartbeat = q40_heartbeat;
 179 #endif
 180     mach_halt = q40_halt;
 181
 182     /* disable a few things that SMSQ might have left enabled */
 183     q40_disable_irqs();
 184
 185     /* no DMA at all, but ide-scsi requires it.. make sure
 186      * all physical RAM fits into the boundary - otherwise
 187      * allocator may play costly and useless tricks */
 188     mach_max_dma_address = 1024*1024*1024;
 189
 190     /* useful for early debugging stages - writes kernel messages into SRAM */
 191     if (!strncmp( m68k_debug_device,"mem",3 ))
 192       {
 193         /*printk("using NVRAM debug, q40_mem_cptr=%p\n",q40_mem_cptr);*/
 194         _cpleft=2000-((long)q40_mem_cptr-0xff020000)/4;
 195         q40_console_driver.write = q40_mem_console_write;
 196         register_console(&q40_console_driver);
 197       }
 198 }
 199
 200
 201 int q40_parse_bootinfo(const struct bi_record *rec)
 202 {
 203   return 1;
 204 }
 205
 206
 207 static inline unsigned char bcd2bin (unsigned char b)
 208 {
 209         return ((b>>4)*10 + (b&15));
 210 }
 211
 212 static inline unsigned char bin2bcd (unsigned char b)
 213 {
 214         return (((b/10)*16) + (b%10));
 215 }
 216
 217
 218 unsigned long q40_gettimeoffset (void)
 219 {
 220     return 5000*(ql_ticks!=0);
 221 }
 222
 223
 224 /*
 225  * Looks like op is non-zero for setting the clock, and zero for
 226  * reading the clock.
 227  *
 228  *  struct hwclk_time {
 229  *         unsigned        sec;       0..59
 230  *         unsigned        min;       0..59
 231  *         unsigned        hour;      0..23
 232  *         unsigned        day;       1..31
 233  *         unsigned        mon;       0..11
 234  *         unsigned        year;      00...
 235  *         int             wday;      0..6, 0 is Sunday, -1 means unknown/don't set
 236  * };
 237  */
 238
 239 int q40_hwclk(int op, struct rtc_time *t)
 240 {
 241         if (op)
 242         {       /* Write.... */
 243                 Q40_RTC_CTRL |= Q40_RTC_WRITE;
 244
 245                 Q40_RTC_SECS = bin2bcd(t->tm_sec);
 246                 Q40_RTC_MINS = bin2bcd(t->tm_min);
 247                 Q40_RTC_HOUR = bin2bcd(t->tm_hour);
 248                 Q40_RTC_DATE = bin2bcd(t->tm_mday);
 249                 Q40_RTC_MNTH = bin2bcd(t->tm_mon + 1);
 250                 Q40_RTC_YEAR = bin2bcd(t->tm_year%100);
 251                 if (t->tm_wday >= 0)
 252                         Q40_RTC_DOW = bin2bcd(t->tm_wday+1);
 253
 254                 Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
 255         }
 256         else
 257         {       /* Read....  */
 258           Q40_RTC_CTRL |= Q40_RTC_READ;
 259
 260           t->tm_year = bcd2bin (Q40_RTC_YEAR);
 261           t->tm_mon  = bcd2bin (Q40_RTC_MNTH)-1;
 262           t->tm_mday = bcd2bin (Q40_RTC_DATE);
 263           t->tm_hour = bcd2bin (Q40_RTC_HOUR);
 264           t->tm_min  = bcd2bin (Q40_RTC_MINS);
 265           t->tm_sec  = bcd2bin (Q40_RTC_SECS);
 266
 267           Q40_RTC_CTRL &= ~(Q40_RTC_READ);
 268
 269           if (t->tm_year < 70)
 270             t->tm_year += 100;
 271           t->tm_wday = bcd2bin(Q40_RTC_DOW)-1;
 272
 273         }
 274
 275         return 0;
 276 }
 277
 278 unsigned int q40_get_ss(void)
 279 {
 280         return bcd2bin(Q40_RTC_SECS);
 281 }
 282
 283 /*
 284  * Set the minutes and seconds from seconds value 'nowtime'.  Fail if
 285  * clock is out by > 30 minutes.  Logic lifted from atari code.
 286  */
 287
 288 int q40_set_clock_mmss (unsigned long nowtime)
 289 {
 290         int retval = 0;
 291         short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
 292
 293         int rtc_minutes;
 294
 295
 296         rtc_minutes = bcd2bin (Q40_RTC_MINS);
 297
 298         if ((rtc_minutes < real_minutes
 299                 ? real_minutes - rtc_minutes
 300                         : rtc_minutes - real_minutes) < 30)
 301         {
 302                 Q40_RTC_CTRL |= Q40_RTC_WRITE;
 303                 Q40_RTC_MINS = bin2bcd(real_minutes);
 304                 Q40_RTC_SECS = bin2bcd(real_seconds);
 305                 Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
 306         }
 307         else
 308                 retval = -1;
 309
 310
 311         return retval;
 312 }
 313
 314
 315 /* get and set PLL calibration of RTC clock */
 316 #define Q40_RTC_PLL_MASK ((1<<5)-1)
 317 #define Q40_RTC_PLL_SIGN (1<<5)
 318
 319 static int q40_get_rtc_pll(struct rtc_pll_info *pll)
 320 {
 321         int tmp=Q40_RTC_CTRL;
 322         pll->pll_value = tmp & Q40_RTC_PLL_MASK;
 323         if (tmp & Q40_RTC_PLL_SIGN)
 324                 pll->pll_value = -pll->pll_value;
 325         pll->pll_max=31;
 326         pll->pll_min=-31;
 327         pll->pll_posmult=512;
 328         pll->pll_negmult=256;
 329         pll->pll_clock=125829120;
 330         return 0;
 331 }
 332
 333 static int q40_set_rtc_pll(struct rtc_pll_info *pll)
 334 {
 335         if (!pll->pll_ctrl){
 336                 /* the docs are a bit unclear so I am doublesetting */
 337                 /* RTC_WRITE here ... */
 338                 int tmp = (pll->pll_value & 31) | (pll->pll_value<0 ? 32 : 0) |
 339                           Q40_RTC_WRITE;
 340                 Q40_RTC_CTRL |= Q40_RTC_WRITE;
 341                 Q40_RTC_CTRL = tmp;
 342                 Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
 343                 return 0;
 344         } else
 345                 return -EINVAL;
 346 }