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/config.h>
  16 #include <linux/types.h>
  17 #include <linux/kernel.h>
  18 #include <linux/mm.h>
  19 #include <linux/tty.h>
  20 #include <linux/console.h>
  21 #include <linux/linkage.h>
  22 #include <linux/init.h>
  23 #include <linux/major.h>
  24 #include <linux/serial_reg.h>
  25 #include <linux/rtc.h>
  26 #include <linux/vt_kern.h>
  27
  28 #include <asm/io.h>
  29 #include <asm/rtc.h>
  30 #include <asm/bootinfo.h>
  31 #include <asm/system.h>
  32 #include <asm/pgtable.h>
  33 #include <asm/setup.h>
  34 #include <asm/irq.h>
  35 #include <asm/traps.h>
  36 #include <asm/machdep.h>
  37 #include <asm/q40_master.h>
  38
  39 extern irqreturn_t q40_process_int (int level, struct pt_regs *regs);
  40 extern void q40_init_IRQ (void);
  41 static void q40_get_model(char *model);
  42 static int  q40_get_hardware_list(char *buffer);
  43 extern void q40_sched_init(irqreturn_t (*handler)(int, void *, struct pt_regs *));
  44
  45 extern unsigned long q40_gettimeoffset (void);
  46 extern int q40_hwclk (int, struct rtc_time *);
  47 extern unsigned int q40_get_ss (void);
  48 extern int q40_set_clock_mmss (unsigned long);
  49 static int q40_get_rtc_pll(struct rtc_pll_info *pll);
  50 static int q40_set_rtc_pll(struct rtc_pll_info *pll);
  51 extern void q40_reset (void);
  52 void q40_halt(void);
  53 extern void q40_waitbut(void);
  54 void q40_set_vectors (void);
  55
  56 extern void q40_mksound(unsigned int /*freq*/, unsigned int /*ticks*/ );
  57
  58 extern char m68k_debug_device[];
  59 static void q40_mem_console_write(struct console *co, const char *b,
  60                                     unsigned int count);
  61
  62 extern int ql_ticks;
  63
  64 static struct console q40_console_driver = {
  65         .name =         "debug",
  66         .flags =        CON_PRINTBUFFER,
  67         .index =        -1,
  68 };
  69
  70
  71 /* early debugging function:*/
  72 extern char *q40_mem_cptr; /*=(char *)0xff020000;*/
  73 static int _cpleft;
  74
  75 static void q40_mem_console_write(struct console *co, const char *s,
  76                                   unsigned int count)
  77 {
  78   char *p=(char *)s;
  79
  80   if (count<_cpleft)
  81     while (count-- >0){
  82       *q40_mem_cptr=*p++;
  83       q40_mem_cptr+=4;
  84       _cpleft--;
  85     }
  86 }
  87 #if 0
  88 void printq40(char *str)
  89 {
  90   int l=strlen(str);
  91   char *p=q40_mem_cptr;
  92
  93   while (l-- >0 && _cpleft-- >0)
  94     {
  95       *p=*str++;
  96       p+=4;
  97     }
  98   q40_mem_cptr=p;
  99 }
 100 #endif
 101
 102 static int halted=0;
 103
 104 #ifdef CONFIG_HEARTBEAT
 105 static void q40_heartbeat(int on)
 106 {
 107   if (halted) return;
 108
 109   if (on)
 110     Q40_LED_ON();
 111   else
 112     Q40_LED_OFF();
 113 }
 114 #endif
 115
 116 void q40_reset(void)
 117 {
 118         halted=1;
 119         printk ("\n\n*******************************************\n"
 120                 "Called q40_reset : press the RESET button!! \n"
 121                 "*******************************************\n");
 122         Q40_LED_ON();
 123         while(1) ;
 124 }
 125 void q40_halt(void)
 126 {
 127         halted=1;
 128         printk ("\n\n*******************\n"
 129                     "  Called q40_halt\n"
 130                     "*******************\n");
 131         Q40_LED_ON();
 132         while(1) ;
 133 }
 134
 135 static void q40_get_model(char *model)
 136 {
 137     sprintf(model, "Q40");
 138 }
 139
 140 /* No hardware options on Q40? */
 141
 142 static int q40_get_hardware_list(char *buffer)
 143 {
 144     *buffer = '\0';
 145     return 0;
 146 }
 147
 148 static unsigned int serports[]={0x3f8,0x2f8,0x3e8,0x2e8,0};
 149 void q40_disable_irqs(void)
 150 {
 151   unsigned i,j;
 152
 153   j=0;
 154   while((i=serports[j++])) outb(0,i+UART_IER);
 155   master_outb(0,EXT_ENABLE_REG);
 156   master_outb(0,KEY_IRQ_ENABLE_REG);
 157 }
 158
 159 void __init config_q40(void)
 160 {
 161     mach_sched_init      = q40_sched_init;
 162
 163     mach_init_IRQ        = q40_init_IRQ;
 164     mach_gettimeoffset   = q40_gettimeoffset;
 165     mach_hwclk           = q40_hwclk;
 166     mach_get_ss          = q40_get_ss;
 167     mach_get_rtc_pll     = q40_get_rtc_pll;
 168     mach_set_rtc_pll     = q40_set_rtc_pll;
 169     mach_set_clock_mmss  = q40_set_clock_mmss;
 170
 171     mach_reset           = q40_reset;
 172     mach_get_model       = q40_get_model;
 173     mach_get_hardware_list = q40_get_hardware_list;
 174
 175 #if defined(CONFIG_INPUT_M68K_BEEP) || defined(CONFIG_INPUT_M68K_BEEP_MODULE)
 176     mach_beep            = q40_mksound;
 177 #endif
 178 #ifdef CONFIG_HEARTBEAT
 179     mach_heartbeat = q40_heartbeat;
 180 #endif
 181     mach_halt = q40_halt;
 182
 183     /* disable a few things that SMSQ might have left enabled */
 184     q40_disable_irqs();
 185
 186     /* no DMA at all, but ide-scsi requires it.. make sure
 187      * all physical RAM fits into the boundary - otherwise
 188      * allocator may play costly and useless tricks */
 189     mach_max_dma_address = 1024*1024*1024;
 190
 191     /* useful for early debugging stages - writes kernel messages into SRAM */
 192     if (!strncmp( m68k_debug_device,"mem",3 ))
 193       {
 194         /*printk("using NVRAM debug, q40_mem_cptr=%p\n",q40_mem_cptr);*/
 195         _cpleft=2000-((long)q40_mem_cptr-0xff020000)/4;
 196         q40_console_driver.write = q40_mem_console_write;
 197         register_console(&q40_console_driver);
 198       }
 199 }
 200
 201
 202 int q40_parse_bootinfo(const struct bi_record *rec)
 203 {
 204   return 1;
 205 }
 206
 207
 208 static inline unsigned char bcd2bin (unsigned char b)
 209 {
 210         return ((b>>4)*10 + (b&15));
 211 }
 212
 213 static inline unsigned char bin2bcd (unsigned char b)
 214 {
 215         return (((b/10)*16) + (b%10));
 216 }
 217
 218
 219 unsigned long q40_gettimeoffset (void)
 220 {
 221     return 5000*(ql_ticks!=0);
 222 }
 223
 224
 225 /*
 226  * Looks like op is non-zero for setting the clock, and zero for
 227  * reading the clock.
 228  *
 229  *  struct hwclk_time {
 230  *         unsigned        sec;       0..59
 231  *         unsigned        min;       0..59
 232  *         unsigned        hour;      0..23
 233  *         unsigned        day;       1..31
 234  *         unsigned        mon;       0..11
 235  *         unsigned        year;      00...
 236  *         int             wday;      0..6, 0 is Sunday, -1 means unknown/don't set
 237  * };
 238  */
 239
 240 int q40_hwclk(int op, struct rtc_time *t)
 241 {
 242         if (op)
 243         {       /* Write.... */
 244                 Q40_RTC_CTRL |= Q40_RTC_WRITE;
 245
 246                 Q40_RTC_SECS = bin2bcd(t->tm_sec);
 247                 Q40_RTC_MINS = bin2bcd(t->tm_min);
 248                 Q40_RTC_HOUR = bin2bcd(t->tm_hour);
 249                 Q40_RTC_DATE = bin2bcd(t->tm_mday);
 250                 Q40_RTC_MNTH = bin2bcd(t->tm_mon + 1);
 251                 Q40_RTC_YEAR = bin2bcd(t->tm_year%100);
 252                 if (t->tm_wday >= 0)
 253                         Q40_RTC_DOW = bin2bcd(t->tm_wday+1);
 254
 255                 Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
 256         }
 257         else
 258         {       /* Read....  */
 259           Q40_RTC_CTRL |= Q40_RTC_READ;
 260
 261           t->tm_year = bcd2bin (Q40_RTC_YEAR);
 262           t->tm_mon  = bcd2bin (Q40_RTC_MNTH)-1;
 263           t->tm_mday = bcd2bin (Q40_RTC_DATE);
 264           t->tm_hour = bcd2bin (Q40_RTC_HOUR);
 265           t->tm_min  = bcd2bin (Q40_RTC_MINS);
 266           t->tm_sec  = bcd2bin (Q40_RTC_SECS);
 267
 268           Q40_RTC_CTRL &= ~(Q40_RTC_READ);
 269
 270           if (t->tm_year < 70)
 271             t->tm_year += 100;
 272           t->tm_wday = bcd2bin(Q40_RTC_DOW)-1;
 273
 274         }
 275
 276         return 0;
 277 }
 278
 279 unsigned int q40_get_ss(void)
 280 {
 281         return bcd2bin(Q40_RTC_SECS);
 282 }
 283
 284 /*
 285  * Set the minutes and seconds from seconds value 'nowtime'.  Fail if
 286  * clock is out by > 30 minutes.  Logic lifted from atari code.
 287  */
 288
 289 int q40_set_clock_mmss (unsigned long nowtime)
 290 {
 291         int retval = 0;
 292         short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
 293
 294         int rtc_minutes;
 295
 296
 297         rtc_minutes = bcd2bin (Q40_RTC_MINS);
 298
 299         if ((rtc_minutes < real_minutes
 300                 ? real_minutes - rtc_minutes
 301                         : rtc_minutes - real_minutes) < 30)
 302         {
 303                 Q40_RTC_CTRL |= Q40_RTC_WRITE;
 304                 Q40_RTC_MINS = bin2bcd(real_minutes);
 305                 Q40_RTC_SECS = bin2bcd(real_seconds);
 306                 Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
 307         }
 308         else
 309                 retval = -1;
 310
 311
 312         return retval;
 313 }
 314
 315
 316 /* get and set PLL calibration of RTC clock */
 317 #define Q40_RTC_PLL_MASK ((1<<5)-1)
 318 #define Q40_RTC_PLL_SIGN (1<<5)
 319
 320 static int q40_get_rtc_pll(struct rtc_pll_info *pll)
 321 {
 322         int tmp=Q40_RTC_CTRL;
 323         pll->pll_value = tmp & Q40_RTC_PLL_MASK;
 324         if (tmp & Q40_RTC_PLL_SIGN)
 325                 pll->pll_value = -pll->pll_value;
 326         pll->pll_max=31;
 327         pll->pll_min=-31;
 328         pll->pll_posmult=512;
 329         pll->pll_negmult=256;
 330         pll->pll_clock=125829120;
 331         return 0;
 332 }
 333
 334 static int q40_set_rtc_pll(struct rtc_pll_info *pll)
 335 {
 336         if (!pll->pll_ctrl){
 337                 /* the docs are a bit unclear so I am doublesetting */
 338                 /* RTC_WRITE here ... */
 339                 int tmp = (pll->pll_value & 31) | (pll->pll_value<0 ? 32 : 0) |
 340                           Q40_RTC_WRITE;
 341                 Q40_RTC_CTRL |= Q40_RTC_WRITE;
 342                 Q40_RTC_CTRL = tmp;
 343                 Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
 344                 return 0;
 345         } else
 346                 return -EINVAL;
 347 }