2 * linux/arch/m68k/atari/config.c
4 * Copyright (C) 1994 Bjoern Brauel
7 * Added setting of time_adj to get a better clock.
12 * 5/15/94 Roman Hodek:
13 * hard_reset_now() for Atari (and others?)
15 * 94/12/30 Andreas Schwab:
16 * atari_sched_init fixed to get precise clock.
18 * This file is subject to the terms and conditions of the GNU General Public
19 * License. See the file COPYING in the main directory of this archive
24 * Miscellaneous atari stuff
27 #include <linux/config.h>
28 #include <linux/types.h>
30 #include <linux/console.h>
31 #include <linux/init.h>
32 #include <linux/delay.h>
33 #include <linux/ioport.h>
34 #include <linux/vt_kern.h>
36 #include <asm/bootinfo.h>
37 #include <asm/setup.h>
38 #include <asm/atarihw.h>
39 #include <asm/atariints.h>
40 #include <asm/atari_stram.h>
41 #include <asm/system.h>
42 #include <asm/machdep.h>
43 #include <asm/hwtest.h>
46 u_long atari_mch_cookie;
47 u_long atari_mch_type;
48 struct atari_hw_present atari_hw_present;
49 u_long atari_switches;
50 int atari_dont_touch_floppy_select;
51 int atari_rtc_year_offset;
53 /* local function prototypes */
54 static void atari_reset( void );
55 #ifdef CONFIG_ATARI_FLOPPY
56 extern void atari_floppy_setup(char *, int *);
58 static void atari_get_model(char *model);
59 static int atari_get_hardware_list(char *buffer);
61 /* atari specific irq functions */
62 extern void atari_init_IRQ (void);
63 extern int atari_request_irq (unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *),
64 unsigned long flags, const char *devname, void *dev_id);
65 extern void atari_free_irq (unsigned int irq, void *dev_id);
66 extern void atari_enable_irq (unsigned int);
67 extern void atari_disable_irq (unsigned int);
68 extern int show_atari_interrupts (struct seq_file *, void *);
69 extern void atari_mksound( unsigned int count, unsigned int ticks );
70 #ifdef CONFIG_HEARTBEAT
71 static void atari_heartbeat( int on );
74 /* atari specific timer functions (in time.c) */
75 extern void atari_sched_init(irqreturn_t (*)(int, void *, struct pt_regs *));
76 extern unsigned long atari_gettimeoffset (void);
77 extern int atari_mste_hwclk (int, struct rtc_time *);
78 extern int atari_tt_hwclk (int, struct rtc_time *);
79 extern int atari_mste_set_clock_mmss (unsigned long);
80 extern int atari_tt_set_clock_mmss (unsigned long);
82 /* atari specific debug functions (in debug.c) */
83 extern void atari_debug_init(void);
86 /* I've moved hwreg_present() and hwreg_present_bywrite() out into
87 * mm/hwtest.c, to avoid having multiple copies of the same routine
88 * in the kernel [I wanted them in hp300 and they were already used
89 * in the nubus code. NB: I don't have an Atari so this might (just
90 * conceivably) break something.
91 * I've preserved the #if 0 version of hwreg_present_bywrite() here
93 * -- Peter Maydell <pmaydell@chiark.greenend.org.uk>, 05/1998
98 hwreg_present_bywrite(volatile void *regp, unsigned char val)
101 long save_sp, save_vbr;
102 static long tmp_vectors[3] = { [2] = (long)&&after_test };
105 ( "movec %/vbr,%2\n\t" /* save vbr value */
106 "movec %4,%/vbr\n\t" /* set up temporary vectors */
107 "movel %/sp,%1\n\t" /* save sp */
108 "moveq #0,%0\n\t" /* assume not present */
109 "moveb %5,%3@\n\t" /* write the hardware reg */
110 "cmpb %3@,%5\n\t" /* compare it */
111 "seq %0" /* comes here only if reg */
113 : "=d&" (ret), "=r&" (save_sp), "=r&" (save_vbr)
114 : "a" (regp), "r" (tmp_vectors), "d" (val)
118 ( "movel %0,%/sp\n\t" /* restore sp */
119 "movec %1,%/vbr" /* restore vbr */
120 : : "r" (save_sp), "r" (save_vbr) : "sp"
128 /* ++roman: This is a more elaborate test for an SCC chip, since the plain
129 * Medusa board generates DTACK at the SCC's standard addresses, but a SCC
130 * board in the Medusa is possible. Also, the addresses where the ST_ESCC
131 * resides generate DTACK without the chip, too.
132 * The method is to write values into the interrupt vector register, that
133 * should be readable without trouble (from channel A!).
136 static int __init scc_test( volatile char *ctla )
138 if (!hwreg_present( ctla ))
142 *ctla = 2; MFPDELAY();
143 *ctla = 0x40; MFPDELAY();
145 *ctla = 2; MFPDELAY();
146 if (*ctla != 0x40) return( 0 );
149 *ctla = 2; MFPDELAY();
150 *ctla = 0x60; MFPDELAY();
152 *ctla = 2; MFPDELAY();
153 if (*ctla != 0x60) return( 0 );
160 * Parse an Atari-specific record in the bootinfo
163 int __init atari_parse_bootinfo(const struct bi_record *record)
166 const u_long *data = record->data;
168 switch (record->tag) {
169 case BI_ATARI_MCH_COOKIE:
170 atari_mch_cookie = *data;
172 case BI_ATARI_MCH_TYPE:
173 atari_mch_type = *data;
182 /* Parse the Atari-specific switches= option. */
183 void __init atari_switches_setup( const char *str, unsigned len )
185 char switches[len+1];
188 char *args = switches;
190 /* copy string to local array, strsep works destructively... */
191 strlcpy( switches, str, sizeof(switches) );
194 /* parse the options */
195 while ((p = strsep(&args, ",")) != NULL) {
198 if (strncmp( p, "ov_", 3 ) == 0) {
200 ovsc_shift = ATARI_SWITCH_OVSC_SHIFT;
203 if (strcmp( p, "ikbd" ) == 0) {
204 /* RTS line of IKBD ACIA */
205 atari_switches |= ATARI_SWITCH_IKBD << ovsc_shift;
207 else if (strcmp( p, "midi" ) == 0) {
208 /* RTS line of MIDI ACIA */
209 atari_switches |= ATARI_SWITCH_MIDI << ovsc_shift;
211 else if (strcmp( p, "snd6" ) == 0) {
212 atari_switches |= ATARI_SWITCH_SND6 << ovsc_shift;
214 else if (strcmp( p, "snd7" ) == 0) {
215 atari_switches |= ATARI_SWITCH_SND7 << ovsc_shift;
222 * Setup the Atari configuration info
225 void __init config_atari(void)
227 unsigned short tos_version;
229 memset(&atari_hw_present, 0, sizeof(atari_hw_present));
233 ioport_resource.end = 0xFFFFFFFF; /* Change size of I/O space from 64KB
236 mach_sched_init = atari_sched_init;
237 mach_init_IRQ = atari_init_IRQ;
238 mach_request_irq = atari_request_irq;
239 mach_free_irq = atari_free_irq;
240 enable_irq = atari_enable_irq;
241 disable_irq = atari_disable_irq;
242 mach_get_model = atari_get_model;
243 mach_get_hardware_list = atari_get_hardware_list;
244 mach_get_irq_list = show_atari_interrupts;
245 mach_gettimeoffset = atari_gettimeoffset;
246 mach_reset = atari_reset;
247 #ifdef CONFIG_ATARI_FLOPPY
248 mach_floppy_setup = atari_floppy_setup;
250 mach_max_dma_address = 0xffffff;
251 #if defined(CONFIG_INPUT_M68K_BEEP) || defined(CONFIG_INPUT_M68K_BEEP_MODULE)
252 mach_beep = atari_mksound;
254 #ifdef CONFIG_HEARTBEAT
255 mach_heartbeat = atari_heartbeat;
258 /* Set switches as requested by the user */
259 if (atari_switches & ATARI_SWITCH_IKBD)
260 acia.key_ctrl = ACIA_DIV64 | ACIA_D8N1S | ACIA_RHTID;
261 if (atari_switches & ATARI_SWITCH_MIDI)
262 acia.mid_ctrl = ACIA_DIV16 | ACIA_D8N1S | ACIA_RHTID;
263 if (atari_switches & (ATARI_SWITCH_SND6|ATARI_SWITCH_SND7)) {
264 sound_ym.rd_data_reg_sel = 14;
265 sound_ym.wd_data = sound_ym.rd_data_reg_sel |
266 ((atari_switches&ATARI_SWITCH_SND6) ? 0x40 : 0) |
267 ((atari_switches&ATARI_SWITCH_SND7) ? 0x80 : 0);
271 * Determine hardware present
274 printk( "Atari hardware found: " );
275 if (MACH_IS_MEDUSA || MACH_IS_HADES) {
276 /* There's no Atari video hardware on the Medusa, but all the
277 * addresses below generate a DTACK so no bus error occurs! */
279 else if (hwreg_present( f030_xreg )) {
280 ATARIHW_SET(VIDEL_SHIFTER);
282 /* This is a temporary hack: If there is Falcon video
283 * hardware, we assume that the ST-DMA serves SCSI instead of
284 * ACSI. In the future, there should be a better method for
287 ATARIHW_SET(ST_SCSI);
288 printk( "STDMA-SCSI " );
290 else if (hwreg_present( tt_palette )) {
291 ATARIHW_SET(TT_SHIFTER);
292 printk( "TT_SHIFTER " );
294 else if (hwreg_present( &shifter.bas_hi )) {
295 if (hwreg_present( &shifter.bas_lo ) &&
296 (shifter.bas_lo = 0x0aau, shifter.bas_lo == 0x0aau)) {
297 ATARIHW_SET(EXTD_SHIFTER);
298 printk( "EXTD_SHIFTER " );
301 ATARIHW_SET(STND_SHIFTER);
302 printk( "STND_SHIFTER " );
305 if (hwreg_present( &mfp.par_dt_reg )) {
309 if (hwreg_present( &tt_mfp.par_dt_reg )) {
313 if (hwreg_present( &tt_scsi_dma.dma_addr_hi )) {
314 ATARIHW_SET(SCSI_DMA);
315 printk( "TT_SCSI_DMA " );
317 if (!MACH_IS_HADES && hwreg_present( &st_dma.dma_hi )) {
318 ATARIHW_SET(STND_DMA);
319 printk( "STND_DMA " );
321 if (MACH_IS_MEDUSA || /* The ST-DMA address registers aren't readable
322 * on all Medusas, so the test below may fail */
323 (hwreg_present( &st_dma.dma_vhi ) &&
324 (st_dma.dma_vhi = 0x55) && (st_dma.dma_hi = 0xaa) &&
325 st_dma.dma_vhi == 0x55 && st_dma.dma_hi == 0xaa &&
326 (st_dma.dma_vhi = 0xaa) && (st_dma.dma_hi = 0x55) &&
327 st_dma.dma_vhi == 0xaa && st_dma.dma_hi == 0x55)) {
328 ATARIHW_SET(EXTD_DMA);
329 printk( "EXTD_DMA " );
331 if (hwreg_present( &tt_scsi.scsi_data )) {
332 ATARIHW_SET(TT_SCSI);
333 printk( "TT_SCSI " );
335 if (hwreg_present( &sound_ym.rd_data_reg_sel )) {
336 ATARIHW_SET(YM_2149);
339 if (!MACH_IS_MEDUSA && !MACH_IS_HADES &&
340 hwreg_present( &tt_dmasnd.ctrl )) {
341 ATARIHW_SET(PCM_8BIT);
344 if (!MACH_IS_HADES && hwreg_present( &falcon_codec.unused5 )) {
348 if (hwreg_present( &dsp56k_host_interface.icr )) {
352 if (hwreg_present( &tt_scc_dma.dma_ctrl ) &&
354 /* This test sucks! Who knows some better? */
355 (tt_scc_dma.dma_ctrl = 0x01, (tt_scc_dma.dma_ctrl & 1) == 1) &&
356 (tt_scc_dma.dma_ctrl = 0x00, (tt_scc_dma.dma_ctrl & 1) == 0)
358 !MACH_IS_MEDUSA && !MACH_IS_HADES
361 ATARIHW_SET(SCC_DMA);
362 printk( "SCC_DMA " );
364 if (scc_test( &scc.cha_a_ctrl )) {
368 if (scc_test( &st_escc.cha_b_ctrl )) {
369 ATARIHW_SET( ST_ESCC );
370 printk( "ST_ESCC " );
377 else if (hwreg_present( &tt_scu.sys_mask )) {
379 /* Assume a VME bus if there's a SCU */
381 printk( "VME SCU " );
383 if (hwreg_present( (void *)(0xffff9210) )) {
384 ATARIHW_SET(ANALOG_JOY);
385 printk( "ANALOG_JOY " );
387 if (!MACH_IS_HADES && hwreg_present( blitter.halftone )) {
388 ATARIHW_SET(BLITTER);
389 printk( "BLITTER " );
391 if (hwreg_present((void *)0xfff00039)) {
395 #if 1 /* This maybe wrong */
396 if (!MACH_IS_MEDUSA && !MACH_IS_HADES &&
397 hwreg_present( &tt_microwire.data ) &&
398 hwreg_present( &tt_microwire.mask ) &&
399 (tt_microwire.mask = 0x7ff,
401 tt_microwire.data = MW_LM1992_PSG_HIGH | MW_LM1992_ADDR,
403 tt_microwire.data != 0)) {
404 ATARIHW_SET(MICROWIRE);
405 while (tt_microwire.mask != 0x7ff) ;
406 printk( "MICROWIRE " );
409 if (hwreg_present( &tt_rtc.regsel )) {
412 mach_hwclk = atari_tt_hwclk;
413 mach_set_clock_mmss = atari_tt_set_clock_mmss;
415 if (!MACH_IS_HADES && hwreg_present( &mste_rtc.sec_ones)) {
416 ATARIHW_SET(MSTE_CLK);
417 printk( "MSTE_CLK ");
418 mach_hwclk = atari_mste_hwclk;
419 mach_set_clock_mmss = atari_mste_set_clock_mmss;
421 if (!MACH_IS_MEDUSA && !MACH_IS_HADES &&
422 hwreg_present( &dma_wd.fdc_speed ) &&
423 hwreg_write( &dma_wd.fdc_speed, 0 )) {
424 ATARIHW_SET(FDCSPEED);
425 printk( "FDC_SPEED ");
427 if (!MACH_IS_HADES && !ATARIHW_PRESENT(ST_SCSI)) {
433 if (CPU_IS_040_OR_060)
434 /* Now it seems to be safe to turn of the tt0 transparent
435 * translation (the one that must not be turned off in
438 __asm__ volatile ("moveq #0,%/d0\n\t"
440 "movec %%d0,%%itt0\n\t"
441 "movec %%d0,%%dtt0\n\t"
447 /* allocator for memory that must reside in st-ram */
450 /* Set up a mapping for the VMEbus address region:
452 * VME is either at phys. 0xfexxxxxx (TT) or 0xa00000..0xdfffff
453 * (MegaSTE) In both cases, the whole 16 MB chunk is mapped at
454 * 0xfe000000 virt., because this can be done with a single
455 * transparent translation. On the 68040, lots of often unused
456 * page tables would be needed otherwise. On a MegaSTE or similar,
457 * the highest byte is stripped off by hardware due to the 24 bit
461 if (CPU_IS_020_OR_030) {
462 unsigned long tt1_val;
463 tt1_val = 0xfe008543; /* Translate 0xfexxxxxx, enable, cache
464 * inhibit, read and write, FDC mask = 3,
465 * FDC val = 4 -> Supervisor only */
466 __asm__ __volatile__ ( ".chip 68030\n\t"
467 "pmove %0@,%/tt1\n\t"
469 : : "a" (&tt1_val) );
473 ( "movel %0,%/d0\n\t"
475 "movec %%d0,%%itt1\n\t"
476 "movec %%d0,%%dtt1\n\t"
479 : "g" (0xfe00a040) /* Translate 0xfexxxxxx, enable,
480 * supervisor only, non-cacheable/
481 * serialized, writable */
486 /* Fetch tos version at Physical 2 */
487 /* We my not be able to access this address if the kernel is
488 loaded to st ram, since the first page is unmapped. On the
489 Medusa this is always the case and there is nothing we can do
490 about this, so we just assume the smaller offset. For the TT
491 we use the fact that in head.S we have set up a mapping
492 0xFFxxxxxx -> 0x00xxxxxx, so that the first 16MB is accessible
493 in the last 16MB of the address space. */
494 tos_version = (MACH_IS_MEDUSA || MACH_IS_HADES) ?
495 0xfff : *(unsigned short *)0xff000002;
496 atari_rtc_year_offset = (tos_version < 0x306) ? 70 : 68;
499 #ifdef CONFIG_HEARTBEAT
500 static void atari_heartbeat( int on )
505 if (atari_dont_touch_floppy_select)
508 local_irq_save(flags);
509 sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
510 tmp = sound_ym.rd_data_reg_sel;
511 sound_ym.wd_data = on ? (tmp & ~0x02) : (tmp | 0x02);
512 local_irq_restore(flags);
518 * This function does a reset on machines that lack the ability to
519 * assert the processor's _RESET signal somehow via hardware. It is
520 * based on the fact that you can find the initial SP and PC values
521 * after a reset at physical addresses 0 and 4. This works pretty well
522 * for Atari machines, since the lowest 8 bytes of physical memory are
523 * really ROM (mapped by hardware). For other 680x0 machines: don't
524 * know if it works...
526 * To get the values at addresses 0 and 4, the MMU better is turned
527 * off first. After that, we have to jump into physical address space
528 * (the PC before the pmove statement points to the virtual address of
529 * the code). Getting that physical address is not hard, but the code
530 * becomes a bit complex since I've tried to ensure that the jump
531 * statement after the pmove is in the cache already (otherwise the
532 * processor can't fetch it!). For that, the code first jumps to the
533 * jump statement with the (virtual) address of the pmove section in
534 * an address register . The jump statement is surely in the cache
535 * now. After that, that physical address of the reset code is loaded
536 * into the same address register, pmove is done and the same jump
537 * statements goes to the reset code. Since there are not many
538 * statements between the two jumps, I hope it stays in the cache.
540 * The C code makes heavy use of the GCC features that you can get the
541 * address of a C label. No hope to compile this with another compiler
545 /* ++andreas: no need for complicated code, just depend on prefetch */
547 static void atari_reset (void)
552 /* On the Medusa, phys. 0x4 may contain garbage because it's no
553 ROM. See above for explanation why we cannot use PTOV(4). */
554 reset_addr = MACH_IS_HADES ? 0x7fe00030 :
555 MACH_IS_MEDUSA || MACH_IS_AB40 ? 0xe00030 :
556 *(unsigned long *) 0xff000004;
558 /* reset ACIA for switch off OverScan, if it's active */
559 if (atari_switches & ATARI_SWITCH_OVSC_IKBD)
560 acia.key_ctrl = ACIA_RESET;
561 if (atari_switches & ATARI_SWITCH_OVSC_MIDI)
562 acia.mid_ctrl = ACIA_RESET;
564 /* processor independent: turn off interrupts and reset the VBR;
565 * the caches must be left enabled, else prefetching the final jump
566 * instruction doesn't work. */
573 if (CPU_IS_040_OR_060) {
574 unsigned long jmp_addr040 = virt_to_phys(&&jmp_addr_label040);
576 /* 68060: clear PCR to turn off superscalar operation */
580 "movec %%d0,%%pcr\n\t"
587 "andl #0xff000000,%/d0\n\t"
588 "orw #0xe020,%/d0\n\t" /* map 16 MB, enable, cacheable */
590 "movec %%d0,%%itt0\n\t"
591 "movec %%d0,%%dtt0\n\t"
606 "movec %%d0,%%tc\n\t"
608 /* the following setup of transparent translations is needed on the
609 * Afterburner040 to successfully reboot. Other machines shouldn't
610 * care about a different tt regs setup, they also didn't care in
611 * the past that the regs weren't turned off. */
612 "movel #0xffc000,%%d0\n\t" /* whole insn space cacheable */
613 "movec %%d0,%%itt0\n\t"
614 "movec %%d0,%%itt1\n\t"
615 "orw #0x40,%/d0\n\t" /* whole data space non-cacheable/ser. */
616 "movec %%d0,%%dtt0\n\t"
617 "movec %%d0,%%dtt1\n\t"
626 ("pmove %0@,%/tc\n\t"
629 : "a" (&tc_val), "a" (reset_addr));
633 static void atari_get_model(char *model)
635 strcpy(model, "Atari ");
636 switch (atari_mch_cookie >> 16) {
638 if (ATARIHW_PRESENT(MSTE_CLK))
639 strcat (model, "Mega ST");
641 strcat (model, "ST");
645 strcat (model, "Mega STE");
647 strcat (model, "STE");
651 /* Medusa has TT _MCH cookie */
652 strcat (model, "Medusa");
653 else if (MACH_IS_HADES)
654 strcat(model, "Hades");
656 strcat (model, "TT");
658 case ATARI_MCH_FALCON:
659 strcat (model, "Falcon");
661 strcat (model, " (with Afterburner040)");
664 sprintf (model + strlen (model), "(unknown mach cookie 0x%lx)",
671 static int atari_get_hardware_list(char *buffer)
675 for (i = 0; i < m68k_num_memory; i++)
676 len += sprintf (buffer+len, "\t%3ld MB at 0x%08lx (%s)\n",
677 m68k_memory[i].size >> 20, m68k_memory[i].addr,
678 (m68k_memory[i].addr & 0xff000000 ?
679 "alternate RAM" : "ST-RAM"));
681 #define ATARIHW_ANNOUNCE(name,str) \
682 if (ATARIHW_PRESENT(name)) \
683 len += sprintf (buffer + len, "\t%s\n", str)
685 len += sprintf (buffer + len, "Detected hardware:\n");
686 ATARIHW_ANNOUNCE(STND_SHIFTER, "ST Shifter");
687 ATARIHW_ANNOUNCE(EXTD_SHIFTER, "STe Shifter");
688 ATARIHW_ANNOUNCE(TT_SHIFTER, "TT Shifter");
689 ATARIHW_ANNOUNCE(VIDEL_SHIFTER, "Falcon Shifter");
690 ATARIHW_ANNOUNCE(YM_2149, "Programmable Sound Generator");
691 ATARIHW_ANNOUNCE(PCM_8BIT, "PCM 8 Bit Sound");
692 ATARIHW_ANNOUNCE(CODEC, "CODEC Sound");
693 ATARIHW_ANNOUNCE(TT_SCSI, "SCSI Controller NCR5380 (TT style)");
694 ATARIHW_ANNOUNCE(ST_SCSI, "SCSI Controller NCR5380 (Falcon style)");
695 ATARIHW_ANNOUNCE(ACSI, "ACSI Interface");
696 ATARIHW_ANNOUNCE(IDE, "IDE Interface");
697 ATARIHW_ANNOUNCE(FDCSPEED, "8/16 Mhz Switch for FDC");
698 ATARIHW_ANNOUNCE(ST_MFP, "Multi Function Peripheral MFP 68901");
699 ATARIHW_ANNOUNCE(TT_MFP, "Second Multi Function Peripheral MFP 68901");
700 ATARIHW_ANNOUNCE(SCC, "Serial Communications Controller SCC 8530");
701 ATARIHW_ANNOUNCE(ST_ESCC, "Extended Serial Communications Controller SCC 85230");
702 ATARIHW_ANNOUNCE(ANALOG_JOY, "Paddle Interface");
703 ATARIHW_ANNOUNCE(MICROWIRE, "MICROWIRE(tm) Interface");
704 ATARIHW_ANNOUNCE(STND_DMA, "DMA Controller (24 bit)");
705 ATARIHW_ANNOUNCE(EXTD_DMA, "DMA Controller (32 bit)");
706 ATARIHW_ANNOUNCE(SCSI_DMA, "DMA Controller for NCR5380");
707 ATARIHW_ANNOUNCE(SCC_DMA, "DMA Controller for SCC");
708 ATARIHW_ANNOUNCE(TT_CLK, "Clock Chip MC146818A");
709 ATARIHW_ANNOUNCE(MSTE_CLK, "Clock Chip RP5C15");
710 ATARIHW_ANNOUNCE(SCU, "System Control Unit");
711 ATARIHW_ANNOUNCE(BLITTER, "Blitter");
712 ATARIHW_ANNOUNCE(VME, "VME Bus");
713 ATARIHW_ANNOUNCE(DSP56K, "DSP56001 processor");