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 static void atari_get_model(char *model);
56 static int atari_get_hardware_list(char *buffer);
58 /* atari specific irq functions */
59 extern void atari_init_IRQ (void);
60 extern int atari_request_irq (unsigned int irq, irqreturn_t (*handler)(int, void *, struct pt_regs *),
61 unsigned long flags, const char *devname, void *dev_id);
62 extern void atari_free_irq (unsigned int irq, void *dev_id);
63 extern void atari_enable_irq (unsigned int);
64 extern void atari_disable_irq (unsigned int);
65 extern int show_atari_interrupts (struct seq_file *, void *);
66 extern void atari_mksound( unsigned int count, unsigned int ticks );
67 #ifdef CONFIG_HEARTBEAT
68 static void atari_heartbeat( int on );
71 /* atari specific timer functions (in time.c) */
72 extern void atari_sched_init(irqreturn_t (*)(int, void *, struct pt_regs *));
73 extern unsigned long atari_gettimeoffset (void);
74 extern int atari_mste_hwclk (int, struct rtc_time *);
75 extern int atari_tt_hwclk (int, struct rtc_time *);
76 extern int atari_mste_set_clock_mmss (unsigned long);
77 extern int atari_tt_set_clock_mmss (unsigned long);
79 /* atari specific debug functions (in debug.c) */
80 extern void atari_debug_init(void);
83 /* I've moved hwreg_present() and hwreg_present_bywrite() out into
84 * mm/hwtest.c, to avoid having multiple copies of the same routine
85 * in the kernel [I wanted them in hp300 and they were already used
86 * in the nubus code. NB: I don't have an Atari so this might (just
87 * conceivably) break something.
88 * I've preserved the #if 0 version of hwreg_present_bywrite() here
90 * -- Peter Maydell <pmaydell@chiark.greenend.org.uk>, 05/1998
95 hwreg_present_bywrite(volatile void *regp, unsigned char val)
98 long save_sp, save_vbr;
99 static long tmp_vectors[3] = { [2] = (long)&&after_test };
102 ( "movec %/vbr,%2\n\t" /* save vbr value */
103 "movec %4,%/vbr\n\t" /* set up temporary vectors */
104 "movel %/sp,%1\n\t" /* save sp */
105 "moveq #0,%0\n\t" /* assume not present */
106 "moveb %5,%3@\n\t" /* write the hardware reg */
107 "cmpb %3@,%5\n\t" /* compare it */
108 "seq %0" /* comes here only if reg */
110 : "=d&" (ret), "=r&" (save_sp), "=r&" (save_vbr)
111 : "a" (regp), "r" (tmp_vectors), "d" (val)
115 ( "movel %0,%/sp\n\t" /* restore sp */
116 "movec %1,%/vbr" /* restore vbr */
117 : : "r" (save_sp), "r" (save_vbr) : "sp"
125 /* ++roman: This is a more elaborate test for an SCC chip, since the plain
126 * Medusa board generates DTACK at the SCC's standard addresses, but a SCC
127 * board in the Medusa is possible. Also, the addresses where the ST_ESCC
128 * resides generate DTACK without the chip, too.
129 * The method is to write values into the interrupt vector register, that
130 * should be readable without trouble (from channel A!).
133 static int __init scc_test( volatile char *ctla )
135 if (!hwreg_present( ctla ))
139 *ctla = 2; MFPDELAY();
140 *ctla = 0x40; MFPDELAY();
142 *ctla = 2; MFPDELAY();
143 if (*ctla != 0x40) return( 0 );
146 *ctla = 2; MFPDELAY();
147 *ctla = 0x60; MFPDELAY();
149 *ctla = 2; MFPDELAY();
150 if (*ctla != 0x60) return( 0 );
157 * Parse an Atari-specific record in the bootinfo
160 int __init atari_parse_bootinfo(const struct bi_record *record)
163 const u_long *data = record->data;
165 switch (record->tag) {
166 case BI_ATARI_MCH_COOKIE:
167 atari_mch_cookie = *data;
169 case BI_ATARI_MCH_TYPE:
170 atari_mch_type = *data;
179 /* Parse the Atari-specific switches= option. */
180 void __init atari_switches_setup( const char *str, unsigned len )
182 char switches[len+1];
185 char *args = switches;
187 /* copy string to local array, strsep works destructively... */
188 strlcpy( switches, str, sizeof(switches) );
191 /* parse the options */
192 while ((p = strsep(&args, ",")) != NULL) {
195 if (strncmp( p, "ov_", 3 ) == 0) {
197 ovsc_shift = ATARI_SWITCH_OVSC_SHIFT;
200 if (strcmp( p, "ikbd" ) == 0) {
201 /* RTS line of IKBD ACIA */
202 atari_switches |= ATARI_SWITCH_IKBD << ovsc_shift;
204 else if (strcmp( p, "midi" ) == 0) {
205 /* RTS line of MIDI ACIA */
206 atari_switches |= ATARI_SWITCH_MIDI << ovsc_shift;
208 else if (strcmp( p, "snd6" ) == 0) {
209 atari_switches |= ATARI_SWITCH_SND6 << ovsc_shift;
211 else if (strcmp( p, "snd7" ) == 0) {
212 atari_switches |= ATARI_SWITCH_SND7 << ovsc_shift;
219 * Setup the Atari configuration info
222 void __init config_atari(void)
224 unsigned short tos_version;
226 memset(&atari_hw_present, 0, sizeof(atari_hw_present));
230 ioport_resource.end = 0xFFFFFFFF; /* Change size of I/O space from 64KB
233 mach_sched_init = atari_sched_init;
234 mach_init_IRQ = atari_init_IRQ;
235 mach_request_irq = atari_request_irq;
236 mach_free_irq = atari_free_irq;
237 enable_irq = atari_enable_irq;
238 disable_irq = atari_disable_irq;
239 mach_get_model = atari_get_model;
240 mach_get_hardware_list = atari_get_hardware_list;
241 mach_get_irq_list = show_atari_interrupts;
242 mach_gettimeoffset = atari_gettimeoffset;
243 mach_reset = atari_reset;
244 mach_max_dma_address = 0xffffff;
245 #if defined(CONFIG_INPUT_M68K_BEEP) || defined(CONFIG_INPUT_M68K_BEEP_MODULE)
246 mach_beep = atari_mksound;
248 #ifdef CONFIG_HEARTBEAT
249 mach_heartbeat = atari_heartbeat;
252 /* Set switches as requested by the user */
253 if (atari_switches & ATARI_SWITCH_IKBD)
254 acia.key_ctrl = ACIA_DIV64 | ACIA_D8N1S | ACIA_RHTID;
255 if (atari_switches & ATARI_SWITCH_MIDI)
256 acia.mid_ctrl = ACIA_DIV16 | ACIA_D8N1S | ACIA_RHTID;
257 if (atari_switches & (ATARI_SWITCH_SND6|ATARI_SWITCH_SND7)) {
258 sound_ym.rd_data_reg_sel = 14;
259 sound_ym.wd_data = sound_ym.rd_data_reg_sel |
260 ((atari_switches&ATARI_SWITCH_SND6) ? 0x40 : 0) |
261 ((atari_switches&ATARI_SWITCH_SND7) ? 0x80 : 0);
265 * Determine hardware present
268 printk( "Atari hardware found: " );
269 if (MACH_IS_MEDUSA || MACH_IS_HADES) {
270 /* There's no Atari video hardware on the Medusa, but all the
271 * addresses below generate a DTACK so no bus error occurs! */
273 else if (hwreg_present( f030_xreg )) {
274 ATARIHW_SET(VIDEL_SHIFTER);
276 /* This is a temporary hack: If there is Falcon video
277 * hardware, we assume that the ST-DMA serves SCSI instead of
278 * ACSI. In the future, there should be a better method for
281 ATARIHW_SET(ST_SCSI);
282 printk( "STDMA-SCSI " );
284 else if (hwreg_present( tt_palette )) {
285 ATARIHW_SET(TT_SHIFTER);
286 printk( "TT_SHIFTER " );
288 else if (hwreg_present( &shifter.bas_hi )) {
289 if (hwreg_present( &shifter.bas_lo ) &&
290 (shifter.bas_lo = 0x0aau, shifter.bas_lo == 0x0aau)) {
291 ATARIHW_SET(EXTD_SHIFTER);
292 printk( "EXTD_SHIFTER " );
295 ATARIHW_SET(STND_SHIFTER);
296 printk( "STND_SHIFTER " );
299 if (hwreg_present( &mfp.par_dt_reg )) {
303 if (hwreg_present( &tt_mfp.par_dt_reg )) {
307 if (hwreg_present( &tt_scsi_dma.dma_addr_hi )) {
308 ATARIHW_SET(SCSI_DMA);
309 printk( "TT_SCSI_DMA " );
311 if (!MACH_IS_HADES && hwreg_present( &st_dma.dma_hi )) {
312 ATARIHW_SET(STND_DMA);
313 printk( "STND_DMA " );
315 if (MACH_IS_MEDUSA || /* The ST-DMA address registers aren't readable
316 * on all Medusas, so the test below may fail */
317 (hwreg_present( &st_dma.dma_vhi ) &&
318 (st_dma.dma_vhi = 0x55) && (st_dma.dma_hi = 0xaa) &&
319 st_dma.dma_vhi == 0x55 && st_dma.dma_hi == 0xaa &&
320 (st_dma.dma_vhi = 0xaa) && (st_dma.dma_hi = 0x55) &&
321 st_dma.dma_vhi == 0xaa && st_dma.dma_hi == 0x55)) {
322 ATARIHW_SET(EXTD_DMA);
323 printk( "EXTD_DMA " );
325 if (hwreg_present( &tt_scsi.scsi_data )) {
326 ATARIHW_SET(TT_SCSI);
327 printk( "TT_SCSI " );
329 if (hwreg_present( &sound_ym.rd_data_reg_sel )) {
330 ATARIHW_SET(YM_2149);
333 if (!MACH_IS_MEDUSA && !MACH_IS_HADES &&
334 hwreg_present( &tt_dmasnd.ctrl )) {
335 ATARIHW_SET(PCM_8BIT);
338 if (!MACH_IS_HADES && hwreg_present( &falcon_codec.unused5 )) {
342 if (hwreg_present( &dsp56k_host_interface.icr )) {
346 if (hwreg_present( &tt_scc_dma.dma_ctrl ) &&
348 /* This test sucks! Who knows some better? */
349 (tt_scc_dma.dma_ctrl = 0x01, (tt_scc_dma.dma_ctrl & 1) == 1) &&
350 (tt_scc_dma.dma_ctrl = 0x00, (tt_scc_dma.dma_ctrl & 1) == 0)
352 !MACH_IS_MEDUSA && !MACH_IS_HADES
355 ATARIHW_SET(SCC_DMA);
356 printk( "SCC_DMA " );
358 if (scc_test( &scc.cha_a_ctrl )) {
362 if (scc_test( &st_escc.cha_b_ctrl )) {
363 ATARIHW_SET( ST_ESCC );
364 printk( "ST_ESCC " );
371 else if (hwreg_present( &tt_scu.sys_mask )) {
373 /* Assume a VME bus if there's a SCU */
375 printk( "VME SCU " );
377 if (hwreg_present( (void *)(0xffff9210) )) {
378 ATARIHW_SET(ANALOG_JOY);
379 printk( "ANALOG_JOY " );
381 if (!MACH_IS_HADES && hwreg_present( blitter.halftone )) {
382 ATARIHW_SET(BLITTER);
383 printk( "BLITTER " );
385 if (hwreg_present((void *)0xfff00039)) {
389 #if 1 /* This maybe wrong */
390 if (!MACH_IS_MEDUSA && !MACH_IS_HADES &&
391 hwreg_present( &tt_microwire.data ) &&
392 hwreg_present( &tt_microwire.mask ) &&
393 (tt_microwire.mask = 0x7ff,
395 tt_microwire.data = MW_LM1992_PSG_HIGH | MW_LM1992_ADDR,
397 tt_microwire.data != 0)) {
398 ATARIHW_SET(MICROWIRE);
399 while (tt_microwire.mask != 0x7ff) ;
400 printk( "MICROWIRE " );
403 if (hwreg_present( &tt_rtc.regsel )) {
406 mach_hwclk = atari_tt_hwclk;
407 mach_set_clock_mmss = atari_tt_set_clock_mmss;
409 if (!MACH_IS_HADES && hwreg_present( &mste_rtc.sec_ones)) {
410 ATARIHW_SET(MSTE_CLK);
411 printk( "MSTE_CLK ");
412 mach_hwclk = atari_mste_hwclk;
413 mach_set_clock_mmss = atari_mste_set_clock_mmss;
415 if (!MACH_IS_MEDUSA && !MACH_IS_HADES &&
416 hwreg_present( &dma_wd.fdc_speed ) &&
417 hwreg_write( &dma_wd.fdc_speed, 0 )) {
418 ATARIHW_SET(FDCSPEED);
419 printk( "FDC_SPEED ");
421 if (!MACH_IS_HADES && !ATARIHW_PRESENT(ST_SCSI)) {
427 if (CPU_IS_040_OR_060)
428 /* Now it seems to be safe to turn of the tt0 transparent
429 * translation (the one that must not be turned off in
432 __asm__ volatile ("moveq #0,%/d0\n\t"
434 "movec %%d0,%%itt0\n\t"
435 "movec %%d0,%%dtt0\n\t"
441 /* allocator for memory that must reside in st-ram */
444 /* Set up a mapping for the VMEbus address region:
446 * VME is either at phys. 0xfexxxxxx (TT) or 0xa00000..0xdfffff
447 * (MegaSTE) In both cases, the whole 16 MB chunk is mapped at
448 * 0xfe000000 virt., because this can be done with a single
449 * transparent translation. On the 68040, lots of often unused
450 * page tables would be needed otherwise. On a MegaSTE or similar,
451 * the highest byte is stripped off by hardware due to the 24 bit
455 if (CPU_IS_020_OR_030) {
456 unsigned long tt1_val;
457 tt1_val = 0xfe008543; /* Translate 0xfexxxxxx, enable, cache
458 * inhibit, read and write, FDC mask = 3,
459 * FDC val = 4 -> Supervisor only */
460 __asm__ __volatile__ ( ".chip 68030\n\t"
461 "pmove %0@,%/tt1\n\t"
463 : : "a" (&tt1_val) );
467 ( "movel %0,%/d0\n\t"
469 "movec %%d0,%%itt1\n\t"
470 "movec %%d0,%%dtt1\n\t"
473 : "g" (0xfe00a040) /* Translate 0xfexxxxxx, enable,
474 * supervisor only, non-cacheable/
475 * serialized, writable */
480 /* Fetch tos version at Physical 2 */
481 /* We my not be able to access this address if the kernel is
482 loaded to st ram, since the first page is unmapped. On the
483 Medusa this is always the case and there is nothing we can do
484 about this, so we just assume the smaller offset. For the TT
485 we use the fact that in head.S we have set up a mapping
486 0xFFxxxxxx -> 0x00xxxxxx, so that the first 16MB is accessible
487 in the last 16MB of the address space. */
488 tos_version = (MACH_IS_MEDUSA || MACH_IS_HADES) ?
489 0xfff : *(unsigned short *)0xff000002;
490 atari_rtc_year_offset = (tos_version < 0x306) ? 70 : 68;
493 #ifdef CONFIG_HEARTBEAT
494 static void atari_heartbeat( int on )
499 if (atari_dont_touch_floppy_select)
502 local_irq_save(flags);
503 sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
504 tmp = sound_ym.rd_data_reg_sel;
505 sound_ym.wd_data = on ? (tmp & ~0x02) : (tmp | 0x02);
506 local_irq_restore(flags);
512 * This function does a reset on machines that lack the ability to
513 * assert the processor's _RESET signal somehow via hardware. It is
514 * based on the fact that you can find the initial SP and PC values
515 * after a reset at physical addresses 0 and 4. This works pretty well
516 * for Atari machines, since the lowest 8 bytes of physical memory are
517 * really ROM (mapped by hardware). For other 680x0 machines: don't
518 * know if it works...
520 * To get the values at addresses 0 and 4, the MMU better is turned
521 * off first. After that, we have to jump into physical address space
522 * (the PC before the pmove statement points to the virtual address of
523 * the code). Getting that physical address is not hard, but the code
524 * becomes a bit complex since I've tried to ensure that the jump
525 * statement after the pmove is in the cache already (otherwise the
526 * processor can't fetch it!). For that, the code first jumps to the
527 * jump statement with the (virtual) address of the pmove section in
528 * an address register . The jump statement is surely in the cache
529 * now. After that, that physical address of the reset code is loaded
530 * into the same address register, pmove is done and the same jump
531 * statements goes to the reset code. Since there are not many
532 * statements between the two jumps, I hope it stays in the cache.
534 * The C code makes heavy use of the GCC features that you can get the
535 * address of a C label. No hope to compile this with another compiler
539 /* ++andreas: no need for complicated code, just depend on prefetch */
541 static void atari_reset (void)
546 /* On the Medusa, phys. 0x4 may contain garbage because it's no
547 ROM. See above for explanation why we cannot use PTOV(4). */
548 reset_addr = MACH_IS_HADES ? 0x7fe00030 :
549 MACH_IS_MEDUSA || MACH_IS_AB40 ? 0xe00030 :
550 *(unsigned long *) 0xff000004;
552 /* reset ACIA for switch off OverScan, if it's active */
553 if (atari_switches & ATARI_SWITCH_OVSC_IKBD)
554 acia.key_ctrl = ACIA_RESET;
555 if (atari_switches & ATARI_SWITCH_OVSC_MIDI)
556 acia.mid_ctrl = ACIA_RESET;
558 /* processor independent: turn off interrupts and reset the VBR;
559 * the caches must be left enabled, else prefetching the final jump
560 * instruction doesn't work. */
567 if (CPU_IS_040_OR_060) {
568 unsigned long jmp_addr040 = virt_to_phys(&&jmp_addr_label040);
570 /* 68060: clear PCR to turn off superscalar operation */
574 "movec %%d0,%%pcr\n\t"
581 "andl #0xff000000,%/d0\n\t"
582 "orw #0xe020,%/d0\n\t" /* map 16 MB, enable, cacheable */
584 "movec %%d0,%%itt0\n\t"
585 "movec %%d0,%%dtt0\n\t"
600 "movec %%d0,%%tc\n\t"
602 /* the following setup of transparent translations is needed on the
603 * Afterburner040 to successfully reboot. Other machines shouldn't
604 * care about a different tt regs setup, they also didn't care in
605 * the past that the regs weren't turned off. */
606 "movel #0xffc000,%%d0\n\t" /* whole insn space cacheable */
607 "movec %%d0,%%itt0\n\t"
608 "movec %%d0,%%itt1\n\t"
609 "orw #0x40,%/d0\n\t" /* whole data space non-cacheable/ser. */
610 "movec %%d0,%%dtt0\n\t"
611 "movec %%d0,%%dtt1\n\t"
620 ("pmove %0@,%/tc\n\t"
623 : "a" (&tc_val), "a" (reset_addr));
627 static void atari_get_model(char *model)
629 strcpy(model, "Atari ");
630 switch (atari_mch_cookie >> 16) {
632 if (ATARIHW_PRESENT(MSTE_CLK))
633 strcat (model, "Mega ST");
635 strcat (model, "ST");
639 strcat (model, "Mega STE");
641 strcat (model, "STE");
645 /* Medusa has TT _MCH cookie */
646 strcat (model, "Medusa");
647 else if (MACH_IS_HADES)
648 strcat(model, "Hades");
650 strcat (model, "TT");
652 case ATARI_MCH_FALCON:
653 strcat (model, "Falcon");
655 strcat (model, " (with Afterburner040)");
658 sprintf (model + strlen (model), "(unknown mach cookie 0x%lx)",
665 static int atari_get_hardware_list(char *buffer)
669 for (i = 0; i < m68k_num_memory; i++)
670 len += sprintf (buffer+len, "\t%3ld MB at 0x%08lx (%s)\n",
671 m68k_memory[i].size >> 20, m68k_memory[i].addr,
672 (m68k_memory[i].addr & 0xff000000 ?
673 "alternate RAM" : "ST-RAM"));
675 #define ATARIHW_ANNOUNCE(name,str) \
676 if (ATARIHW_PRESENT(name)) \
677 len += sprintf (buffer + len, "\t%s\n", str)
679 len += sprintf (buffer + len, "Detected hardware:\n");
680 ATARIHW_ANNOUNCE(STND_SHIFTER, "ST Shifter");
681 ATARIHW_ANNOUNCE(EXTD_SHIFTER, "STe Shifter");
682 ATARIHW_ANNOUNCE(TT_SHIFTER, "TT Shifter");
683 ATARIHW_ANNOUNCE(VIDEL_SHIFTER, "Falcon Shifter");
684 ATARIHW_ANNOUNCE(YM_2149, "Programmable Sound Generator");
685 ATARIHW_ANNOUNCE(PCM_8BIT, "PCM 8 Bit Sound");
686 ATARIHW_ANNOUNCE(CODEC, "CODEC Sound");
687 ATARIHW_ANNOUNCE(TT_SCSI, "SCSI Controller NCR5380 (TT style)");
688 ATARIHW_ANNOUNCE(ST_SCSI, "SCSI Controller NCR5380 (Falcon style)");
689 ATARIHW_ANNOUNCE(ACSI, "ACSI Interface");
690 ATARIHW_ANNOUNCE(IDE, "IDE Interface");
691 ATARIHW_ANNOUNCE(FDCSPEED, "8/16 Mhz Switch for FDC");
692 ATARIHW_ANNOUNCE(ST_MFP, "Multi Function Peripheral MFP 68901");
693 ATARIHW_ANNOUNCE(TT_MFP, "Second Multi Function Peripheral MFP 68901");
694 ATARIHW_ANNOUNCE(SCC, "Serial Communications Controller SCC 8530");
695 ATARIHW_ANNOUNCE(ST_ESCC, "Extended Serial Communications Controller SCC 85230");
696 ATARIHW_ANNOUNCE(ANALOG_JOY, "Paddle Interface");
697 ATARIHW_ANNOUNCE(MICROWIRE, "MICROWIRE(tm) Interface");
698 ATARIHW_ANNOUNCE(STND_DMA, "DMA Controller (24 bit)");
699 ATARIHW_ANNOUNCE(EXTD_DMA, "DMA Controller (32 bit)");
700 ATARIHW_ANNOUNCE(SCSI_DMA, "DMA Controller for NCR5380");
701 ATARIHW_ANNOUNCE(SCC_DMA, "DMA Controller for SCC");
702 ATARIHW_ANNOUNCE(TT_CLK, "Clock Chip MC146818A");
703 ATARIHW_ANNOUNCE(MSTE_CLK, "Clock Chip RP5C15");
704 ATARIHW_ANNOUNCE(SCU, "System Control Unit");
705 ATARIHW_ANNOUNCE(BLITTER, "Blitter");
706 ATARIHW_ANNOUNCE(VME, "VME Bus");
707 ATARIHW_ANNOUNCE(DSP56K, "DSP56001 processor");