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/types.h>
29 #include <linux/console.h>
30 #include <linux/init.h>
31 #include <linux/delay.h>
32 #include <linux/ioport.h>
33 #include <linux/vt_kern.h>
35 #include <asm/bootinfo.h>
36 #include <asm/setup.h>
37 #include <asm/atarihw.h>
38 #include <asm/atariints.h>
39 #include <asm/atari_stram.h>
40 #include <asm/system.h>
41 #include <asm/machdep.h>
42 #include <asm/hwtest.h>
45 u_long atari_mch_cookie;
46 u_long atari_mch_type;
47 struct atari_hw_present atari_hw_present;
48 u_long atari_switches;
49 int atari_dont_touch_floppy_select;
50 int atari_rtc_year_offset;
52 /* local function prototypes */
53 static void atari_reset(void);
54 static void atari_get_model(char *model);
55 static int atari_get_hardware_list(char *buffer);
57 /* atari specific irq functions */
58 extern void atari_init_IRQ (void);
59 extern void atari_mksound(unsigned int count, unsigned int ticks);
60 #ifdef CONFIG_HEARTBEAT
61 static void atari_heartbeat(int on);
64 /* atari specific timer functions (in time.c) */
65 extern void atari_sched_init(irq_handler_t);
66 extern unsigned long atari_gettimeoffset (void);
67 extern int atari_mste_hwclk (int, struct rtc_time *);
68 extern int atari_tt_hwclk (int, struct rtc_time *);
69 extern int atari_mste_set_clock_mmss (unsigned long);
70 extern int atari_tt_set_clock_mmss (unsigned long);
72 /* atari specific debug functions (in debug.c) */
73 extern void atari_debug_init(void);
76 /* ++roman: This is a more elaborate test for an SCC chip, since the plain
77 * Medusa board generates DTACK at the SCC's standard addresses, but a SCC
78 * board in the Medusa is possible. Also, the addresses where the ST_ESCC
79 * resides generate DTACK without the chip, too.
80 * The method is to write values into the interrupt vector register, that
81 * should be readable without trouble (from channel A!).
84 static int __init scc_test(volatile char *ctla)
86 if (!hwreg_present(ctla))
116 * Parse an Atari-specific record in the bootinfo
119 int __init atari_parse_bootinfo(const struct bi_record *record)
122 const u_long *data = record->data;
124 switch (record->tag) {
125 case BI_ATARI_MCH_COOKIE:
126 atari_mch_cookie = *data;
128 case BI_ATARI_MCH_TYPE:
129 atari_mch_type = *data;
139 /* Parse the Atari-specific switches= option. */
140 void __init atari_switches_setup(const char *str, unsigned len)
142 char switches[len+1];
145 char *args = switches;
147 /* copy string to local array, strsep works destructively... */
148 strlcpy(switches, str, sizeof(switches));
151 /* parse the options */
152 while ((p = strsep(&args, ",")) != NULL) {
156 if (strncmp(p, "ov_", 3) == 0) {
158 ovsc_shift = ATARI_SWITCH_OVSC_SHIFT;
161 if (strcmp(p, "ikbd") == 0) {
162 /* RTS line of IKBD ACIA */
163 atari_switches |= ATARI_SWITCH_IKBD << ovsc_shift;
164 } else if (strcmp(p, "midi") == 0) {
165 /* RTS line of MIDI ACIA */
166 atari_switches |= ATARI_SWITCH_MIDI << ovsc_shift;
167 } else if (strcmp(p, "snd6") == 0) {
168 atari_switches |= ATARI_SWITCH_SND6 << ovsc_shift;
169 } else if (strcmp(p, "snd7") == 0) {
170 atari_switches |= ATARI_SWITCH_SND7 << ovsc_shift;
177 * Setup the Atari configuration info
180 void __init config_atari(void)
182 unsigned short tos_version;
184 memset(&atari_hw_present, 0, sizeof(atari_hw_present));
188 /* Change size of I/O space from 64KB to 4GB. */
189 ioport_resource.end = 0xFFFFFFFF;
191 mach_sched_init = atari_sched_init;
192 mach_init_IRQ = atari_init_IRQ;
193 mach_get_model = atari_get_model;
194 mach_get_hardware_list = atari_get_hardware_list;
195 mach_gettimeoffset = atari_gettimeoffset;
196 mach_reset = atari_reset;
197 mach_max_dma_address = 0xffffff;
198 #if defined(CONFIG_INPUT_M68K_BEEP) || defined(CONFIG_INPUT_M68K_BEEP_MODULE)
199 mach_beep = atari_mksound;
201 #ifdef CONFIG_HEARTBEAT
202 mach_heartbeat = atari_heartbeat;
205 /* Set switches as requested by the user */
206 if (atari_switches & ATARI_SWITCH_IKBD)
207 acia.key_ctrl = ACIA_DIV64 | ACIA_D8N1S | ACIA_RHTID;
208 if (atari_switches & ATARI_SWITCH_MIDI)
209 acia.mid_ctrl = ACIA_DIV16 | ACIA_D8N1S | ACIA_RHTID;
210 if (atari_switches & (ATARI_SWITCH_SND6|ATARI_SWITCH_SND7)) {
211 sound_ym.rd_data_reg_sel = 14;
212 sound_ym.wd_data = sound_ym.rd_data_reg_sel |
213 ((atari_switches&ATARI_SWITCH_SND6) ? 0x40 : 0) |
214 ((atari_switches&ATARI_SWITCH_SND7) ? 0x80 : 0);
218 * Determine hardware present
221 printk("Atari hardware found: ");
222 if (MACH_IS_MEDUSA || MACH_IS_HADES) {
223 /* There's no Atari video hardware on the Medusa, but all the
224 * addresses below generate a DTACK so no bus error occurs! */
225 } else if (hwreg_present(f030_xreg)) {
226 ATARIHW_SET(VIDEL_SHIFTER);
228 /* This is a temporary hack: If there is Falcon video
229 * hardware, we assume that the ST-DMA serves SCSI instead of
230 * ACSI. In the future, there should be a better method for
233 ATARIHW_SET(ST_SCSI);
234 printk("STDMA-SCSI ");
235 } else if (hwreg_present(tt_palette)) {
236 ATARIHW_SET(TT_SHIFTER);
237 printk("TT_SHIFTER ");
238 } else if (hwreg_present(&shifter.bas_hi)) {
239 if (hwreg_present(&shifter.bas_lo) &&
240 (shifter.bas_lo = 0x0aau, shifter.bas_lo == 0x0aau)) {
241 ATARIHW_SET(EXTD_SHIFTER);
242 printk("EXTD_SHIFTER ");
244 ATARIHW_SET(STND_SHIFTER);
245 printk("STND_SHIFTER ");
248 if (hwreg_present(&mfp.par_dt_reg)) {
252 if (hwreg_present(&tt_mfp.par_dt_reg)) {
256 if (hwreg_present(&tt_scsi_dma.dma_addr_hi)) {
257 ATARIHW_SET(SCSI_DMA);
258 printk("TT_SCSI_DMA ");
260 if (!MACH_IS_HADES && hwreg_present(&st_dma.dma_hi)) {
261 ATARIHW_SET(STND_DMA);
265 * The ST-DMA address registers aren't readable
266 * on all Medusas, so the test below may fail
268 if (MACH_IS_MEDUSA ||
269 (hwreg_present(&st_dma.dma_vhi) &&
270 (st_dma.dma_vhi = 0x55) && (st_dma.dma_hi = 0xaa) &&
271 st_dma.dma_vhi == 0x55 && st_dma.dma_hi == 0xaa &&
272 (st_dma.dma_vhi = 0xaa) && (st_dma.dma_hi = 0x55) &&
273 st_dma.dma_vhi == 0xaa && st_dma.dma_hi == 0x55)) {
274 ATARIHW_SET(EXTD_DMA);
277 if (hwreg_present(&tt_scsi.scsi_data)) {
278 ATARIHW_SET(TT_SCSI);
281 if (hwreg_present(&sound_ym.rd_data_reg_sel)) {
282 ATARIHW_SET(YM_2149);
285 if (!MACH_IS_MEDUSA && !MACH_IS_HADES &&
286 hwreg_present(&tt_dmasnd.ctrl)) {
287 ATARIHW_SET(PCM_8BIT);
290 if (!MACH_IS_HADES && hwreg_present(&falcon_codec.unused5)) {
294 if (hwreg_present(&dsp56k_host_interface.icr)) {
298 if (hwreg_present(&tt_scc_dma.dma_ctrl) &&
300 /* This test sucks! Who knows some better? */
301 (tt_scc_dma.dma_ctrl = 0x01, (tt_scc_dma.dma_ctrl & 1) == 1) &&
302 (tt_scc_dma.dma_ctrl = 0x00, (tt_scc_dma.dma_ctrl & 1) == 0)
304 !MACH_IS_MEDUSA && !MACH_IS_HADES
307 ATARIHW_SET(SCC_DMA);
310 if (scc_test(&scc.cha_a_ctrl)) {
314 if (scc_test(&st_escc.cha_b_ctrl)) {
315 ATARIHW_SET(ST_ESCC);
321 } else if (hwreg_present(&tt_scu.sys_mask)) {
323 /* Assume a VME bus if there's a SCU */
327 if (hwreg_present((void *)(0xffff9210))) {
328 ATARIHW_SET(ANALOG_JOY);
329 printk("ANALOG_JOY ");
331 if (!MACH_IS_HADES && hwreg_present(blitter.halftone)) {
332 ATARIHW_SET(BLITTER);
335 if (hwreg_present((void *)0xfff00039)) {
339 #if 1 /* This maybe wrong */
340 if (!MACH_IS_MEDUSA && !MACH_IS_HADES &&
341 hwreg_present(&tt_microwire.data) &&
342 hwreg_present(&tt_microwire.mask) &&
343 (tt_microwire.mask = 0x7ff,
345 tt_microwire.data = MW_LM1992_PSG_HIGH | MW_LM1992_ADDR,
347 tt_microwire.data != 0)) {
348 ATARIHW_SET(MICROWIRE);
349 while (tt_microwire.mask != 0x7ff)
351 printk("MICROWIRE ");
354 if (hwreg_present(&tt_rtc.regsel)) {
357 mach_hwclk = atari_tt_hwclk;
358 mach_set_clock_mmss = atari_tt_set_clock_mmss;
360 if (!MACH_IS_HADES && hwreg_present(&mste_rtc.sec_ones)) {
361 ATARIHW_SET(MSTE_CLK);
363 mach_hwclk = atari_mste_hwclk;
364 mach_set_clock_mmss = atari_mste_set_clock_mmss;
366 if (!MACH_IS_MEDUSA && !MACH_IS_HADES &&
367 hwreg_present(&dma_wd.fdc_speed) &&
368 hwreg_write(&dma_wd.fdc_speed, 0)) {
369 ATARIHW_SET(FDCSPEED);
370 printk("FDC_SPEED ");
372 if (!MACH_IS_HADES && !ATARIHW_PRESENT(ST_SCSI)) {
378 if (CPU_IS_040_OR_060)
379 /* Now it seems to be safe to turn of the tt0 transparent
380 * translation (the one that must not be turned off in
386 " movec %%d0,%%itt0\n"
387 " movec %%d0,%%dtt0\n"
393 /* allocator for memory that must reside in st-ram */
396 /* Set up a mapping for the VMEbus address region:
398 * VME is either at phys. 0xfexxxxxx (TT) or 0xa00000..0xdfffff
399 * (MegaSTE) In both cases, the whole 16 MB chunk is mapped at
400 * 0xfe000000 virt., because this can be done with a single
401 * transparent translation. On the 68040, lots of often unused
402 * page tables would be needed otherwise. On a MegaSTE or similar,
403 * the highest byte is stripped off by hardware due to the 24 bit
407 if (CPU_IS_020_OR_030) {
408 unsigned long tt1_val;
409 tt1_val = 0xfe008543; /* Translate 0xfexxxxxx, enable, cache
410 * inhibit, read and write, FDC mask = 3,
411 * FDC val = 4 -> Supervisor only */
424 : "d" (0xfe00a040)); /* Translate 0xfexxxxxx, enable,
425 * supervisor only, non-cacheable/
426 * serialized, writable */
430 /* Fetch tos version at Physical 2 */
432 * We my not be able to access this address if the kernel is
433 * loaded to st ram, since the first page is unmapped. On the
434 * Medusa this is always the case and there is nothing we can do
435 * about this, so we just assume the smaller offset. For the TT
436 * we use the fact that in head.S we have set up a mapping
437 * 0xFFxxxxxx -> 0x00xxxxxx, so that the first 16MB is accessible
438 * in the last 16MB of the address space.
440 tos_version = (MACH_IS_MEDUSA || MACH_IS_HADES) ?
441 0xfff : *(unsigned short *)0xff000002;
442 atari_rtc_year_offset = (tos_version < 0x306) ? 70 : 68;
445 #ifdef CONFIG_HEARTBEAT
446 static void atari_heartbeat(int on)
451 if (atari_dont_touch_floppy_select)
454 local_irq_save(flags);
455 sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */
456 tmp = sound_ym.rd_data_reg_sel;
457 sound_ym.wd_data = on ? (tmp & ~0x02) : (tmp | 0x02);
458 local_irq_restore(flags);
464 * This function does a reset on machines that lack the ability to
465 * assert the processor's _RESET signal somehow via hardware. It is
466 * based on the fact that you can find the initial SP and PC values
467 * after a reset at physical addresses 0 and 4. This works pretty well
468 * for Atari machines, since the lowest 8 bytes of physical memory are
469 * really ROM (mapped by hardware). For other 680x0 machines: don't
470 * know if it works...
472 * To get the values at addresses 0 and 4, the MMU better is turned
473 * off first. After that, we have to jump into physical address space
474 * (the PC before the pmove statement points to the virtual address of
475 * the code). Getting that physical address is not hard, but the code
476 * becomes a bit complex since I've tried to ensure that the jump
477 * statement after the pmove is in the cache already (otherwise the
478 * processor can't fetch it!). For that, the code first jumps to the
479 * jump statement with the (virtual) address of the pmove section in
480 * an address register . The jump statement is surely in the cache
481 * now. After that, that physical address of the reset code is loaded
482 * into the same address register, pmove is done and the same jump
483 * statements goes to the reset code. Since there are not many
484 * statements between the two jumps, I hope it stays in the cache.
486 * The C code makes heavy use of the GCC features that you can get the
487 * address of a C label. No hope to compile this with another compiler
491 /* ++andreas: no need for complicated code, just depend on prefetch */
493 static void atari_reset(void)
499 * On the Medusa, phys. 0x4 may contain garbage because it's no
500 * ROM. See above for explanation why we cannot use PTOV(4).
502 reset_addr = MACH_IS_HADES ? 0x7fe00030 :
503 MACH_IS_MEDUSA || MACH_IS_AB40 ? 0xe00030 :
504 *(unsigned long *) 0xff000004;
506 /* reset ACIA for switch off OverScan, if it's active */
507 if (atari_switches & ATARI_SWITCH_OVSC_IKBD)
508 acia.key_ctrl = ACIA_RESET;
509 if (atari_switches & ATARI_SWITCH_OVSC_MIDI)
510 acia.mid_ctrl = ACIA_RESET;
512 /* processor independent: turn off interrupts and reset the VBR;
513 * the caches must be left enabled, else prefetching the final jump
514 * instruction doesn't work.
517 asm volatile ("movec %0,%%vbr"
520 if (CPU_IS_040_OR_060) {
521 unsigned long jmp_addr040 = virt_to_phys(&&jmp_addr_label040);
523 /* 68060: clear PCR to turn off superscalar operation */
533 " and.l #0xff000000,%%d0\n"
534 " or.w #0xe020,%%d0\n" /* map 16 MB, enable, cacheable */
536 " movec %%d0,%%itt0\n"
537 " movec %%d0,%%dtt0\n"
540 : : "a" (jmp_addr040)
553 /* the following setup of transparent translations is needed on the
554 * Afterburner040 to successfully reboot. Other machines shouldn't
555 * care about a different tt regs setup, they also didn't care in
556 * the past that the regs weren't turned off. */
557 " move.l #0xffc000,%%d0\n" /* whole insn space cacheable */
558 " movec %%d0,%%itt0\n"
559 " movec %%d0,%%itt1\n"
560 " or.w #0x40,%/d0\n" /* whole data space non-cacheable/ser. */
561 " movec %%d0,%%dtt0\n"
562 " movec %%d0,%%dtt1\n"
573 : "a" (&tc_val), "a" (reset_addr));
577 static void atari_get_model(char *model)
579 strcpy(model, "Atari ");
580 switch (atari_mch_cookie >> 16) {
582 if (ATARIHW_PRESENT(MSTE_CLK))
583 strcat(model, "Mega ST");
589 strcat(model, "Mega STE");
591 strcat(model, "STE");
595 /* Medusa has TT _MCH cookie */
596 strcat(model, "Medusa");
597 else if (MACH_IS_HADES)
598 strcat(model, "Hades");
602 case ATARI_MCH_FALCON:
603 strcat(model, "Falcon");
605 strcat(model, " (with Afterburner040)");
608 sprintf(model + strlen(model), "(unknown mach cookie 0x%lx)",
615 static int atari_get_hardware_list(char *buffer)
619 for (i = 0; i < m68k_num_memory; i++)
620 len += sprintf(buffer+len, "\t%3ld MB at 0x%08lx (%s)\n",
621 m68k_memory[i].size >> 20, m68k_memory[i].addr,
622 (m68k_memory[i].addr & 0xff000000 ?
623 "alternate RAM" : "ST-RAM"));
625 #define ATARIHW_ANNOUNCE(name, str) \
626 if (ATARIHW_PRESENT(name)) \
627 len += sprintf(buffer + len, "\t%s\n", str)
629 len += sprintf(buffer + len, "Detected hardware:\n");
630 ATARIHW_ANNOUNCE(STND_SHIFTER, "ST Shifter");
631 ATARIHW_ANNOUNCE(EXTD_SHIFTER, "STe Shifter");
632 ATARIHW_ANNOUNCE(TT_SHIFTER, "TT Shifter");
633 ATARIHW_ANNOUNCE(VIDEL_SHIFTER, "Falcon Shifter");
634 ATARIHW_ANNOUNCE(YM_2149, "Programmable Sound Generator");
635 ATARIHW_ANNOUNCE(PCM_8BIT, "PCM 8 Bit Sound");
636 ATARIHW_ANNOUNCE(CODEC, "CODEC Sound");
637 ATARIHW_ANNOUNCE(TT_SCSI, "SCSI Controller NCR5380 (TT style)");
638 ATARIHW_ANNOUNCE(ST_SCSI, "SCSI Controller NCR5380 (Falcon style)");
639 ATARIHW_ANNOUNCE(ACSI, "ACSI Interface");
640 ATARIHW_ANNOUNCE(IDE, "IDE Interface");
641 ATARIHW_ANNOUNCE(FDCSPEED, "8/16 Mhz Switch for FDC");
642 ATARIHW_ANNOUNCE(ST_MFP, "Multi Function Peripheral MFP 68901");
643 ATARIHW_ANNOUNCE(TT_MFP, "Second Multi Function Peripheral MFP 68901");
644 ATARIHW_ANNOUNCE(SCC, "Serial Communications Controller SCC 8530");
645 ATARIHW_ANNOUNCE(ST_ESCC, "Extended Serial Communications Controller SCC 85230");
646 ATARIHW_ANNOUNCE(ANALOG_JOY, "Paddle Interface");
647 ATARIHW_ANNOUNCE(MICROWIRE, "MICROWIRE(tm) Interface");
648 ATARIHW_ANNOUNCE(STND_DMA, "DMA Controller (24 bit)");
649 ATARIHW_ANNOUNCE(EXTD_DMA, "DMA Controller (32 bit)");
650 ATARIHW_ANNOUNCE(SCSI_DMA, "DMA Controller for NCR5380");
651 ATARIHW_ANNOUNCE(SCC_DMA, "DMA Controller for SCC");
652 ATARIHW_ANNOUNCE(TT_CLK, "Clock Chip MC146818A");
653 ATARIHW_ANNOUNCE(MSTE_CLK, "Clock Chip RP5C15");
654 ATARIHW_ANNOUNCE(SCU, "System Control Unit");
655 ATARIHW_ANNOUNCE(BLITTER, "Blitter");
656 ATARIHW_ANNOUNCE(VME, "VME Bus");
657 ATARIHW_ANNOUNCE(DSP56K, "DSP56001 processor");