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 #include <linux/bcd.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 void q40_init_IRQ(void);
  40 static void q40_get_model(char *model);
  41 extern void q40_sched_init(irq_handler_t handler);
  42
  43 static unsigned long q40_gettimeoffset(void);
  44 static int q40_hwclk(int, struct rtc_time *);
  45 static unsigned int q40_get_ss(void);
  46 static int q40_set_clock_mmss(unsigned long);
  47 static int q40_get_rtc_pll(struct rtc_pll_info *pll);
  48 static int q40_set_rtc_pll(struct rtc_pll_info *pll);
  49
  50 extern void q40_mksound(unsigned int /*freq*/, unsigned int /*ticks*/);
  51
  52 static void q40_mem_console_write(struct console *co, const char *b,
  53                                   unsigned int count);
  54
  55 extern int ql_ticks;
  56
  57 static struct console q40_console_driver = {
  58         .name   = "debug",
  59         .write  = q40_mem_console_write,
  60         .flags  = CON_PRINTBUFFER,
  61         .index  = -1,
  62 };
  63
  64
  65 /* early debugging function:*/
  66 extern char *q40_mem_cptr; /*=(char *)0xff020000;*/
  67 static int _cpleft;
  68
  69 static void q40_mem_console_write(struct console *co, const char *s,
  70                                   unsigned int count)
  71 {
  72         const char *p = s;
  73
  74         if (count < _cpleft) {
  75                 while (count-- > 0) {
  76                         *q40_mem_cptr = *p++;
  77                         q40_mem_cptr += 4;
  78                         _cpleft--;
  79                 }
  80         }
  81 }
  82
  83 static int __init q40_debug_setup(char *arg)
  84 {
  85         /* useful for early debugging stages - writes kernel messages into SRAM */
  86         if (MACH_IS_Q40 && !strncmp(arg, "mem", 3)) {
  87                 /*printk("using NVRAM debug, q40_mem_cptr=%p\n",q40_mem_cptr);*/
  88                 _cpleft = 2000 - ((long)q40_mem_cptr-0xff020000) / 4;
  89                 register_console(&q40_console_driver);
  90         }
  91         return 0;
  92 }
  93
  94 early_param("debug", q40_debug_setup);
  95
  96 #if 0
  97 void printq40(char *str)
  98 {
  99         int l = strlen(str);
 100         char *p = q40_mem_cptr;
 101
 102         while (l-- > 0 && _cpleft-- > 0) {
 103                 *p = *str++;
 104                 p += 4;
 105         }
 106         q40_mem_cptr = p;
 107 }
 108 #endif
 109
 110 static int halted;
 111
 112 #ifdef CONFIG_HEARTBEAT
 113 static void q40_heartbeat(int on)
 114 {
 115         if (halted)
 116                 return;
 117
 118         if (on)
 119                 Q40_LED_ON();
 120         else
 121                 Q40_LED_OFF();
 122 }
 123 #endif
 124
 125 static void q40_reset(void)
 126 {
 127         halted = 1;
 128         printk("\n\n*******************************************\n"
 129                 "Called q40_reset : press the RESET button!!\n"
 130                 "*******************************************\n");
 131         Q40_LED_ON();
 132         while (1)
 133                 ;
 134 }
 135
 136 static void q40_halt(void)
 137 {
 138         halted = 1;
 139         printk("\n\n*******************\n"
 140                    "  Called q40_halt\n"
 141                    "*******************\n");
 142         Q40_LED_ON();
 143         while (1)
 144                 ;
 145 }
 146
 147 static void q40_get_model(char *model)
 148 {
 149         sprintf(model, "Q40");
 150 }
 151
 152 static unsigned int serports[] =
 153 {
 154         0x3f8,0x2f8,0x3e8,0x2e8,0
 155 };
 156
 157 static void q40_disable_irqs(void)
 158 {
 159         unsigned i, j;
 160
 161         j = 0;
 162         while ((i = serports[j++]))
 163                 outb(0, i + UART_IER);
 164         master_outb(0, EXT_ENABLE_REG);
 165         master_outb(0, KEY_IRQ_ENABLE_REG);
 166 }
 167
 168 void __init config_q40(void)
 169 {
 170         mach_sched_init = q40_sched_init;
 171
 172         mach_init_IRQ = q40_init_IRQ;
 173         mach_gettimeoffset = q40_gettimeoffset;
 174         mach_hwclk = q40_hwclk;
 175         mach_get_ss = q40_get_ss;
 176         mach_get_rtc_pll = q40_get_rtc_pll;
 177         mach_set_rtc_pll = q40_set_rtc_pll;
 178         mach_set_clock_mmss = q40_set_clock_mmss;
 179
 180         mach_reset = q40_reset;
 181         mach_get_model = q40_get_model;
 182
 183 #if defined(CONFIG_INPUT_M68K_BEEP) || defined(CONFIG_INPUT_M68K_BEEP_MODULE)
 184         mach_beep = q40_mksound;
 185 #endif
 186 #ifdef CONFIG_HEARTBEAT
 187         mach_heartbeat = q40_heartbeat;
 188 #endif
 189         mach_halt = q40_halt;
 190
 191         /* disable a few things that SMSQ might have left enabled */
 192         q40_disable_irqs();
 193
 194         /* no DMA at all, but ide-scsi requires it.. make sure
 195          * all physical RAM fits into the boundary - otherwise
 196          * allocator may play costly and useless tricks */
 197         mach_max_dma_address = 1024*1024*1024;
 198 }
 199
 200
 201 int q40_parse_bootinfo(const struct bi_record *rec)
 202 {
 203         return 1;
 204 }
 205
 206
 207 static unsigned long q40_gettimeoffset(void)
 208 {
 209         return 5000 * (ql_ticks != 0);
 210 }
 211
 212
 213 /*
 214  * Looks like op is non-zero for setting the clock, and zero for
 215  * reading the clock.
 216  *
 217  *  struct hwclk_time {
 218  *         unsigned        sec;       0..59
 219  *         unsigned        min;       0..59
 220  *         unsigned        hour;      0..23
 221  *         unsigned        day;       1..31
 222  *         unsigned        mon;       0..11
 223  *         unsigned        year;      00...
 224  *         int             wday;      0..6, 0 is Sunday, -1 means unknown/don't set
 225  * };
 226  */
 227
 228 static int q40_hwclk(int op, struct rtc_time *t)
 229 {
 230         if (op) {
 231                 /* Write.... */
 232                 Q40_RTC_CTRL |= Q40_RTC_WRITE;
 233
 234                 Q40_RTC_SECS = bin2bcd(t->tm_sec);
 235                 Q40_RTC_MINS = bin2bcd(t->tm_min);
 236                 Q40_RTC_HOUR = bin2bcd(t->tm_hour);
 237                 Q40_RTC_DATE = bin2bcd(t->tm_mday);
 238                 Q40_RTC_MNTH = bin2bcd(t->tm_mon + 1);
 239                 Q40_RTC_YEAR = bin2bcd(t->tm_year%100);
 240                 if (t->tm_wday >= 0)
 241                         Q40_RTC_DOW = bin2bcd(t->tm_wday+1);
 242
 243                 Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
 244         } else {
 245                 /* Read....  */
 246                 Q40_RTC_CTRL |= Q40_RTC_READ;
 247
 248                 t->tm_year = bcd2bin (Q40_RTC_YEAR);
 249                 t->tm_mon  = bcd2bin (Q40_RTC_MNTH)-1;
 250                 t->tm_mday = bcd2bin (Q40_RTC_DATE);
 251                 t->tm_hour = bcd2bin (Q40_RTC_HOUR);
 252                 t->tm_min  = bcd2bin (Q40_RTC_MINS);
 253                 t->tm_sec  = bcd2bin (Q40_RTC_SECS);
 254
 255                 Q40_RTC_CTRL &= ~(Q40_RTC_READ);
 256
 257                 if (t->tm_year < 70)
 258                         t->tm_year += 100;
 259                 t->tm_wday = bcd2bin(Q40_RTC_DOW)-1;
 260         }
 261
 262         return 0;
 263 }
 264
 265 static unsigned int q40_get_ss(void)
 266 {
 267         return bcd2bin(Q40_RTC_SECS);
 268 }
 269
 270 /*
 271  * Set the minutes and seconds from seconds value 'nowtime'.  Fail if
 272  * clock is out by > 30 minutes.  Logic lifted from atari code.
 273  */
 274
 275 static int q40_set_clock_mmss(unsigned long nowtime)
 276 {
 277         int retval = 0;
 278         short real_seconds = nowtime % 60, real_minutes = (nowtime / 60) % 60;
 279
 280         int rtc_minutes;
 281
 282         rtc_minutes = bcd2bin(Q40_RTC_MINS);
 283
 284         if ((rtc_minutes < real_minutes ?
 285              real_minutes - rtc_minutes :
 286              rtc_minutes - real_minutes) < 30) {
 287                 Q40_RTC_CTRL |= Q40_RTC_WRITE;
 288                 Q40_RTC_MINS = bin2bcd(real_minutes);
 289                 Q40_RTC_SECS = bin2bcd(real_seconds);
 290                 Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
 291         } else
 292                 retval = -1;
 293
 294         return retval;
 295 }
 296
 297
 298 /* get and set PLL calibration of RTC clock */
 299 #define Q40_RTC_PLL_MASK ((1<<5)-1)
 300 #define Q40_RTC_PLL_SIGN (1<<5)
 301
 302 static int q40_get_rtc_pll(struct rtc_pll_info *pll)
 303 {
 304         int tmp = Q40_RTC_CTRL;
 305
 306         pll->pll_value = tmp & Q40_RTC_PLL_MASK;
 307         if (tmp & Q40_RTC_PLL_SIGN)
 308                 pll->pll_value = -pll->pll_value;
 309         pll->pll_max = 31;
 310         pll->pll_min = -31;
 311         pll->pll_posmult = 512;
 312         pll->pll_negmult = 256;
 313         pll->pll_clock = 125829120;
 314
 315         return 0;
 316 }
 317
 318 static int q40_set_rtc_pll(struct rtc_pll_info *pll)
 319 {
 320         if (!pll->pll_ctrl) {
 321                 /* the docs are a bit unclear so I am doublesetting */
 322                 /* RTC_WRITE here ... */
 323                 int tmp = (pll->pll_value & 31) | (pll->pll_value<0 ? 32 : 0) |
 324                           Q40_RTC_WRITE;
 325                 Q40_RTC_CTRL |= Q40_RTC_WRITE;
 326                 Q40_RTC_CTRL = tmp;
 327                 Q40_RTC_CTRL &= ~(Q40_RTC_WRITE);
 328                 return 0;
 329         } else
 330                 return -EINVAL;
 331 }