/* * linux/arch/m68k/atari/config.c * * Copyright (C) 1994 Bjoern Brauel * * 5/2/94 Roman Hodek: * Added setting of time_adj to get a better clock. * * 5/14/94 Roman Hodek: * gettod() for TT * * 5/15/94 Roman Hodek: * hard_reset_now() for Atari (and others?) * * 94/12/30 Andreas Schwab: * atari_sched_init fixed to get precise clock. * * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive * for more details. */ /* * Miscellaneous atari stuff */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include u_long atari_mch_cookie; EXPORT_SYMBOL(atari_mch_cookie); u_long atari_mch_type; EXPORT_SYMBOL(atari_mch_type); struct atari_hw_present atari_hw_present; EXPORT_SYMBOL(atari_hw_present); u_long atari_switches; EXPORT_SYMBOL(atari_switches); int atari_dont_touch_floppy_select; EXPORT_SYMBOL(atari_dont_touch_floppy_select); int atari_rtc_year_offset; /* local function prototypes */ static void atari_reset(void); static void atari_get_model(char *model); static void atari_get_hardware_list(struct seq_file *m); /* atari specific irq functions */ extern void atari_init_IRQ (void); extern void atari_mksound(unsigned int count, unsigned int ticks); #ifdef CONFIG_HEARTBEAT static void atari_heartbeat(int on); #endif /* atari specific timer functions (in time.c) */ extern void atari_sched_init(irq_handler_t); extern unsigned long atari_gettimeoffset (void); extern int atari_mste_hwclk (int, struct rtc_time *); extern int atari_tt_hwclk (int, struct rtc_time *); extern int atari_mste_set_clock_mmss (unsigned long); extern int atari_tt_set_clock_mmss (unsigned long); /* ++roman: This is a more elaborate test for an SCC chip, since the plain * Medusa board generates DTACK at the SCC's standard addresses, but a SCC * board in the Medusa is possible. Also, the addresses where the ST_ESCC * resides generate DTACK without the chip, too. * The method is to write values into the interrupt vector register, that * should be readable without trouble (from channel A!). */ static int __init scc_test(volatile char *ctla) { if (!hwreg_present(ctla)) return 0; MFPDELAY(); *ctla = 2; MFPDELAY(); *ctla = 0x40; MFPDELAY(); *ctla = 2; MFPDELAY(); if (*ctla != 0x40) return 0; MFPDELAY(); *ctla = 2; MFPDELAY(); *ctla = 0x60; MFPDELAY(); *ctla = 2; MFPDELAY(); if (*ctla != 0x60) return 0; return 1; } /* * Parse an Atari-specific record in the bootinfo */ int __init atari_parse_bootinfo(const struct bi_record *record) { int unknown = 0; const u_long *data = record->data; switch (record->tag) { case BI_ATARI_MCH_COOKIE: atari_mch_cookie = *data; break; case BI_ATARI_MCH_TYPE: atari_mch_type = *data; break; default: unknown = 1; break; } return unknown; } /* Parse the Atari-specific switches= option. */ static int __init atari_switches_setup(char *str) { char switches[strlen(str) + 1]; char *p; int ovsc_shift; char *args = switches; if (!MACH_IS_ATARI) return 0; /* copy string to local array, strsep works destructively... */ strcpy(switches, str); atari_switches = 0; /* parse the options */ while ((p = strsep(&args, ",")) != NULL) { if (!*p) continue; ovsc_shift = 0; if (strncmp(p, "ov_", 3) == 0) { p += 3; ovsc_shift = ATARI_SWITCH_OVSC_SHIFT; } if (strcmp(p, "ikbd") == 0) { /* RTS line of IKBD ACIA */ atari_switches |= ATARI_SWITCH_IKBD << ovsc_shift; } else if (strcmp(p, "midi") == 0) { /* RTS line of MIDI ACIA */ atari_switches |= ATARI_SWITCH_MIDI << ovsc_shift; } else if (strcmp(p, "snd6") == 0) { atari_switches |= ATARI_SWITCH_SND6 << ovsc_shift; } else if (strcmp(p, "snd7") == 0) { atari_switches |= ATARI_SWITCH_SND7 << ovsc_shift; } } return 0; } early_param("switches", atari_switches_setup); /* * Setup the Atari configuration info */ void __init config_atari(void) { unsigned short tos_version; memset(&atari_hw_present, 0, sizeof(atari_hw_present)); /* Change size of I/O space from 64KB to 4GB. */ ioport_resource.end = 0xFFFFFFFF; mach_sched_init = atari_sched_init; mach_init_IRQ = atari_init_IRQ; mach_get_model = atari_get_model; mach_get_hardware_list = atari_get_hardware_list; mach_gettimeoffset = atari_gettimeoffset; mach_reset = atari_reset; mach_max_dma_address = 0xffffff; #if defined(CONFIG_INPUT_M68K_BEEP) || defined(CONFIG_INPUT_M68K_BEEP_MODULE) mach_beep = atari_mksound; #endif #ifdef CONFIG_HEARTBEAT mach_heartbeat = atari_heartbeat; #endif /* Set switches as requested by the user */ if (atari_switches & ATARI_SWITCH_IKBD) acia.key_ctrl = ACIA_DIV64 | ACIA_D8N1S | ACIA_RHTID; if (atari_switches & ATARI_SWITCH_MIDI) acia.mid_ctrl = ACIA_DIV16 | ACIA_D8N1S | ACIA_RHTID; if (atari_switches & (ATARI_SWITCH_SND6|ATARI_SWITCH_SND7)) { sound_ym.rd_data_reg_sel = 14; sound_ym.wd_data = sound_ym.rd_data_reg_sel | ((atari_switches&ATARI_SWITCH_SND6) ? 0x40 : 0) | ((atari_switches&ATARI_SWITCH_SND7) ? 0x80 : 0); } /* ++bjoern: * Determine hardware present */ printk("Atari hardware found: "); if (MACH_IS_MEDUSA) { /* There's no Atari video hardware on the Medusa, but all the * addresses below generate a DTACK so no bus error occurs! */ } else if (hwreg_present(f030_xreg)) { ATARIHW_SET(VIDEL_SHIFTER); printk("VIDEL "); /* This is a temporary hack: If there is Falcon video * hardware, we assume that the ST-DMA serves SCSI instead of * ACSI. In the future, there should be a better method for * this... */ ATARIHW_SET(ST_SCSI); printk("STDMA-SCSI "); } else if (hwreg_present(tt_palette)) { ATARIHW_SET(TT_SHIFTER); printk("TT_SHIFTER "); } else if (hwreg_present(&shifter.bas_hi)) { if (hwreg_present(&shifter.bas_lo) && (shifter.bas_lo = 0x0aau, shifter.bas_lo == 0x0aau)) { ATARIHW_SET(EXTD_SHIFTER); printk("EXTD_SHIFTER "); } else { ATARIHW_SET(STND_SHIFTER); printk("STND_SHIFTER "); } } if (hwreg_present(&st_mfp.par_dt_reg)) { ATARIHW_SET(ST_MFP); printk("ST_MFP "); } if (hwreg_present(&tt_mfp.par_dt_reg)) { ATARIHW_SET(TT_MFP); printk("TT_MFP "); } if (hwreg_present(&tt_scsi_dma.dma_addr_hi)) { ATARIHW_SET(SCSI_DMA); printk("TT_SCSI_DMA "); } /* * The ST-DMA address registers aren't readable * on all Medusas, so the test below may fail */ if (MACH_IS_MEDUSA || (hwreg_present(&st_dma.dma_vhi) && (st_dma.dma_vhi = 0x55) && (st_dma.dma_hi = 0xaa) && st_dma.dma_vhi == 0x55 && st_dma.dma_hi == 0xaa && (st_dma.dma_vhi = 0xaa) && (st_dma.dma_hi = 0x55) && st_dma.dma_vhi == 0xaa && st_dma.dma_hi == 0x55)) { ATARIHW_SET(EXTD_DMA); printk("EXTD_DMA "); } if (hwreg_present(&tt_scsi.scsi_data)) { ATARIHW_SET(TT_SCSI); printk("TT_SCSI "); } if (hwreg_present(&sound_ym.rd_data_reg_sel)) { ATARIHW_SET(YM_2149); printk("YM2149 "); } if (!MACH_IS_MEDUSA && hwreg_present(&tt_dmasnd.ctrl)) { ATARIHW_SET(PCM_8BIT); printk("PCM "); } if (hwreg_present(&falcon_codec.unused5)) { ATARIHW_SET(CODEC); printk("CODEC "); } if (hwreg_present(&dsp56k_host_interface.icr)) { ATARIHW_SET(DSP56K); printk("DSP56K "); } if (hwreg_present(&tt_scc_dma.dma_ctrl) && #if 0 /* This test sucks! Who knows some better? */ (tt_scc_dma.dma_ctrl = 0x01, (tt_scc_dma.dma_ctrl & 1) == 1) && (tt_scc_dma.dma_ctrl = 0x00, (tt_scc_dma.dma_ctrl & 1) == 0) #else !MACH_IS_MEDUSA #endif ) { ATARIHW_SET(SCC_DMA); printk("SCC_DMA "); } if (scc_test(&atari_scc.cha_a_ctrl)) { ATARIHW_SET(SCC); printk("SCC "); } if (scc_test(&st_escc.cha_b_ctrl)) { ATARIHW_SET(ST_ESCC); printk("ST_ESCC "); } if (hwreg_present(&tt_scu.sys_mask)) { ATARIHW_SET(SCU); /* Assume a VME bus if there's a SCU */ ATARIHW_SET(VME); printk("VME SCU "); } if (hwreg_present((void *)(0xffff9210))) { ATARIHW_SET(ANALOG_JOY); printk("ANALOG_JOY "); } if (hwreg_present(blitter.halftone)) { ATARIHW_SET(BLITTER); printk("BLITTER "); } if (hwreg_present((void *)0xfff00039)) { ATARIHW_SET(IDE); printk("IDE "); } #if 1 /* This maybe wrong */ if (!MACH_IS_MEDUSA && hwreg_present(&tt_microwire.data) && hwreg_present(&tt_microwire.mask) && (tt_microwire.mask = 0x7ff, udelay(1), tt_microwire.data = MW_LM1992_PSG_HIGH | MW_LM1992_ADDR, udelay(1), tt_microwire.data != 0)) { ATARIHW_SET(MICROWIRE); while (tt_microwire.mask != 0x7ff) ; printk("MICROWIRE "); } #endif if (hwreg_present(&tt_rtc.regsel)) { ATARIHW_SET(TT_CLK); printk("TT_CLK "); mach_hwclk = atari_tt_hwclk; mach_set_clock_mmss = atari_tt_set_clock_mmss; } if (hwreg_present(&mste_rtc.sec_ones)) { ATARIHW_SET(MSTE_CLK); printk("MSTE_CLK "); mach_hwclk = atari_mste_hwclk; mach_set_clock_mmss = atari_mste_set_clock_mmss; } if (!MACH_IS_MEDUSA && hwreg_present(&dma_wd.fdc_speed) && hwreg_write(&dma_wd.fdc_speed, 0)) { ATARIHW_SET(FDCSPEED); printk("FDC_SPEED "); } if (!ATARIHW_PRESENT(ST_SCSI)) { ATARIHW_SET(ACSI); printk("ACSI "); } printk("\n"); if (CPU_IS_040_OR_060) /* Now it seems to be safe to turn of the tt0 transparent * translation (the one that must not be turned off in * head.S...) */ asm volatile ("\n" " moveq #0,%%d0\n" " .chip 68040\n" " movec %%d0,%%itt0\n" " movec %%d0,%%dtt0\n" " .chip 68k" : /* no outputs */ : /* no inputs */ : "d0"); /* allocator for memory that must reside in st-ram */ atari_stram_init(); /* Set up a mapping for the VMEbus address region: * * VME is either at phys. 0xfexxxxxx (TT) or 0xa00000..0xdfffff * (MegaSTE) In both cases, the whole 16 MB chunk is mapped at * 0xfe000000 virt., because this can be done with a single * transparent translation. On the 68040, lots of often unused * page tables would be needed otherwise. On a MegaSTE or similar, * the highest byte is stripped off by hardware due to the 24 bit * design of the bus. */ if (CPU_IS_020_OR_030) { unsigned long tt1_val; tt1_val = 0xfe008543; /* Translate 0xfexxxxxx, enable, cache * inhibit, read and write, FDC mask = 3, * FDC val = 4 -> Supervisor only */ asm volatile ("\n" " .chip 68030\n" " pmove %0,%/tt1\n" " .chip 68k" : : "m" (tt1_val)); } else { asm volatile ("\n" " .chip 68040\n" " movec %0,%%itt1\n" " movec %0,%%dtt1\n" " .chip 68k" : : "d" (0xfe00a040)); /* Translate 0xfexxxxxx, enable, * supervisor only, non-cacheable/ * serialized, writable */ } /* Fetch tos version at Physical 2 */ /* * We my not be able to access this address if the kernel is * loaded to st ram, since the first page is unmapped. On the * Medusa this is always the case and there is nothing we can do * about this, so we just assume the smaller offset. For the TT * we use the fact that in head.S we have set up a mapping * 0xFFxxxxxx -> 0x00xxxxxx, so that the first 16MB is accessible * in the last 16MB of the address space. */ tos_version = (MACH_IS_MEDUSA) ? 0xfff : *(unsigned short *)0xff000002; atari_rtc_year_offset = (tos_version < 0x306) ? 70 : 68; } #ifdef CONFIG_HEARTBEAT static void atari_heartbeat(int on) { unsigned char tmp; unsigned long flags; if (atari_dont_touch_floppy_select) return; local_irq_save(flags); sound_ym.rd_data_reg_sel = 14; /* Select PSG Port A */ tmp = sound_ym.rd_data_reg_sel; sound_ym.wd_data = on ? (tmp & ~0x02) : (tmp | 0x02); local_irq_restore(flags); } #endif /* ++roman: * * This function does a reset on machines that lack the ability to * assert the processor's _RESET signal somehow via hardware. It is * based on the fact that you can find the initial SP and PC values * after a reset at physical addresses 0 and 4. This works pretty well * for Atari machines, since the lowest 8 bytes of physical memory are * really ROM (mapped by hardware). For other 680x0 machines: don't * know if it works... * * To get the values at addresses 0 and 4, the MMU better is turned * off first. After that, we have to jump into physical address space * (the PC before the pmove statement points to the virtual address of * the code). Getting that physical address is not hard, but the code * becomes a bit complex since I've tried to ensure that the jump * statement after the pmove is in the cache already (otherwise the * processor can't fetch it!). For that, the code first jumps to the * jump statement with the (virtual) address of the pmove section in * an address register . The jump statement is surely in the cache * now. After that, that physical address of the reset code is loaded * into the same address register, pmove is done and the same jump * statements goes to the reset code. Since there are not many * statements between the two jumps, I hope it stays in the cache. * * The C code makes heavy use of the GCC features that you can get the * address of a C label. No hope to compile this with another compiler * than GCC! */ /* ++andreas: no need for complicated code, just depend on prefetch */ static void atari_reset(void) { long tc_val = 0; long reset_addr; /* * On the Medusa, phys. 0x4 may contain garbage because it's no * ROM. See above for explanation why we cannot use PTOV(4). */ reset_addr = MACH_IS_MEDUSA || MACH_IS_AB40 ? 0xe00030 : *(unsigned long *) 0xff000004; /* reset ACIA for switch off OverScan, if it's active */ if (atari_switches & ATARI_SWITCH_OVSC_IKBD) acia.key_ctrl = ACIA_RESET; if (atari_switches & ATARI_SWITCH_OVSC_MIDI) acia.mid_ctrl = ACIA_RESET; /* processor independent: turn off interrupts and reset the VBR; * the caches must be left enabled, else prefetching the final jump * instruction doesn't work. */ local_irq_disable(); asm volatile ("movec %0,%%vbr" : : "d" (0)); if (CPU_IS_040_OR_060) { unsigned long jmp_addr040 = virt_to_phys(&&jmp_addr_label040); if (CPU_IS_060) { /* 68060: clear PCR to turn off superscalar operation */ asm volatile ("\n" " .chip 68060\n" " movec %0,%%pcr\n" " .chip 68k" : : "d" (0)); } asm volatile ("\n" " move.l %0,%%d0\n" " and.l #0xff000000,%%d0\n" " or.w #0xe020,%%d0\n" /* map 16 MB, enable, cacheable */ " .chip 68040\n" " movec %%d0,%%itt0\n" " movec %%d0,%%dtt0\n" " .chip 68k\n" " jmp %0@" : : "a" (jmp_addr040) : "d0"); jmp_addr_label040: asm volatile ("\n" " moveq #0,%%d0\n" " nop\n" " .chip 68040\n" " cinva %%bc\n" " nop\n" " pflusha\n" " nop\n" " movec %%d0,%%tc\n" " nop\n" /* the following setup of transparent translations is needed on the * Afterburner040 to successfully reboot. Other machines shouldn't * care about a different tt regs setup, they also didn't care in * the past that the regs weren't turned off. */ " move.l #0xffc000,%%d0\n" /* whole insn space cacheable */ " movec %%d0,%%itt0\n" " movec %%d0,%%itt1\n" " or.w #0x40,%/d0\n" /* whole data space non-cacheable/ser. */ " movec %%d0,%%dtt0\n" " movec %%d0,%%dtt1\n" " .chip 68k\n" " jmp %0@" : /* no outputs */ : "a" (reset_addr) : "d0"); } else asm volatile ("\n" " pmove %0,%%tc\n" " jmp %1@" : /* no outputs */ : "m" (tc_val), "a" (reset_addr)); } static void atari_get_model(char *model) { strcpy(model, "Atari "); switch (atari_mch_cookie >> 16) { case ATARI_MCH_ST: if (ATARIHW_PRESENT(MSTE_CLK)) strcat(model, "Mega ST"); else strcat(model, "ST"); break; case ATARI_MCH_STE: if (MACH_IS_MSTE) strcat(model, "Mega STE"); else strcat(model, "STE"); break; case ATARI_MCH_TT: if (MACH_IS_MEDUSA) /* Medusa has TT _MCH cookie */ strcat(model, "Medusa"); else strcat(model, "TT"); break; case ATARI_MCH_FALCON: strcat(model, "Falcon"); if (MACH_IS_AB40) strcat(model, " (with Afterburner040)"); break; default: sprintf(model + strlen(model), "(unknown mach cookie 0x%lx)", atari_mch_cookie); break; } } static void atari_get_hardware_list(struct seq_file *m) { int i; for (i = 0; i < m68k_num_memory; i++) seq_printf(m, "\t%3ld MB at 0x%08lx (%s)\n", m68k_memory[i].size >> 20, m68k_memory[i].addr, (m68k_memory[i].addr & 0xff000000 ? "alternate RAM" : "ST-RAM")); #define ATARIHW_ANNOUNCE(name, str) \ if (ATARIHW_PRESENT(name)) \ seq_printf(m, "\t%s\n", str) seq_printf(m, "Detected hardware:\n"); ATARIHW_ANNOUNCE(STND_SHIFTER, "ST Shifter"); ATARIHW_ANNOUNCE(EXTD_SHIFTER, "STe Shifter"); ATARIHW_ANNOUNCE(TT_SHIFTER, "TT Shifter"); ATARIHW_ANNOUNCE(VIDEL_SHIFTER, "Falcon Shifter"); ATARIHW_ANNOUNCE(YM_2149, "Programmable Sound Generator"); ATARIHW_ANNOUNCE(PCM_8BIT, "PCM 8 Bit Sound"); ATARIHW_ANNOUNCE(CODEC, "CODEC Sound"); ATARIHW_ANNOUNCE(TT_SCSI, "SCSI Controller NCR5380 (TT style)"); ATARIHW_ANNOUNCE(ST_SCSI, "SCSI Controller NCR5380 (Falcon style)"); ATARIHW_ANNOUNCE(ACSI, "ACSI Interface"); ATARIHW_ANNOUNCE(IDE, "IDE Interface"); ATARIHW_ANNOUNCE(FDCSPEED, "8/16 Mhz Switch for FDC"); ATARIHW_ANNOUNCE(ST_MFP, "Multi Function Peripheral MFP 68901"); ATARIHW_ANNOUNCE(TT_MFP, "Second Multi Function Peripheral MFP 68901"); ATARIHW_ANNOUNCE(SCC, "Serial Communications Controller SCC 8530"); ATARIHW_ANNOUNCE(ST_ESCC, "Extended Serial Communications Controller SCC 85230"); ATARIHW_ANNOUNCE(ANALOG_JOY, "Paddle Interface"); ATARIHW_ANNOUNCE(MICROWIRE, "MICROWIRE(tm) Interface"); ATARIHW_ANNOUNCE(STND_DMA, "DMA Controller (24 bit)"); ATARIHW_ANNOUNCE(EXTD_DMA, "DMA Controller (32 bit)"); ATARIHW_ANNOUNCE(SCSI_DMA, "DMA Controller for NCR5380"); ATARIHW_ANNOUNCE(SCC_DMA, "DMA Controller for SCC"); ATARIHW_ANNOUNCE(TT_CLK, "Clock Chip MC146818A"); ATARIHW_ANNOUNCE(MSTE_CLK, "Clock Chip RP5C15"); ATARIHW_ANNOUNCE(SCU, "System Control Unit"); ATARIHW_ANNOUNCE(BLITTER, "Blitter"); ATARIHW_ANNOUNCE(VME, "VME Bus"); ATARIHW_ANNOUNCE(DSP56K, "DSP56001 processor"); }