/* * 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.
*/
int atari_dont_touch_floppy_select;
EXPORT_SYMBOL(atari_dont_touch_floppy_select);
int atari_rtc_year_offset;
/* local function prototypes */ staticvoid atari_reset(void); staticvoid atari_get_model(char *model); staticvoid atari_get_hardware_list(struct seq_file *m); #ifdef CONFIG_HEARTBEAT staticvoid atari_heartbeat(int on); #endif
/* ++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!).
*/
staticint __init scc_test(volatilechar *ctla)
{ if (!hwreg_present(ctla)) return 0;
MFPDELAY();
/* 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
*/
pr_info("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! */
} elseif (hwreg_present(f030_xreg)) {
ATARIHW_SET(VIDEL_SHIFTER);
pr_cont(" 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);
pr_cont(" STDMA-SCSI");
} elseif (hwreg_present(tt_palette)) {
ATARIHW_SET(TT_SHIFTER);
pr_cont(" TT_SHIFTER");
} elseif (hwreg_present(&shifter_st.bas_hi)) { if (hwreg_present(&shifter_st.bas_lo) &&
(shifter_st.bas_lo = 0x0aau, shifter_st.bas_lo == 0x0aau)) {
ATARIHW_SET(EXTD_SHIFTER);
pr_cont(" EXTD_SHIFTER");
} else {
ATARIHW_SET(STND_SHIFTER);
pr_cont(" STND_SHIFTER");
}
} if (hwreg_present(&st_mfp.par_dt_reg)) {
ATARIHW_SET(ST_MFP);
pr_cont(" ST_MFP");
} if (hwreg_present(&tt_mfp.par_dt_reg)) {
ATARIHW_SET(TT_MFP);
pr_cont(" TT_MFP");
} if (hwreg_present(&tt_scsi_dma.dma_addr_hi)) {
ATARIHW_SET(SCSI_DMA);
pr_cont(" 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);
pr_cont(" EXTD_DMA");
} if (hwreg_present(&tt_scsi.scsi_data)) {
ATARIHW_SET(TT_SCSI);
pr_cont(" TT_SCSI");
} if (hwreg_present(&sound_ym.rd_data_reg_sel)) {
ATARIHW_SET(YM_2149);
pr_cont(" YM2149");
} if (!MACH_IS_MEDUSA && hwreg_present(&tt_dmasnd.ctrl)) {
ATARIHW_SET(PCM_8BIT);
pr_cont(" PCM");
} if (hwreg_present(&falcon_codec.unused5)) {
ATARIHW_SET(CODEC);
pr_cont(" CODEC");
} if (hwreg_present(&dsp56k_host_interface.icr)) {
ATARIHW_SET(DSP56K);
pr_cont(" 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);
pr_cont(" SCC_DMA");
} if (scc_test(&atari_scc.cha_a_ctrl)) {
ATARIHW_SET(SCC);
pr_cont(" SCC");
} if (scc_test(&st_escc.cha_b_ctrl)) {
ATARIHW_SET(ST_ESCC);
pr_cont(" ST_ESCC");
} if (hwreg_present(&tt_scu.sys_mask)) {
ATARIHW_SET(SCU); /* Assume a VME bus if there's a SCU */
ATARIHW_SET(VME);
pr_cont(" VME SCU");
} if (hwreg_present((void *)(0xffff9210))) {
ATARIHW_SET(ANALOG_JOY);
pr_cont(" ANALOG_JOY");
} if (hwreg_present(blitter.halftone)) {
ATARIHW_SET(BLITTER);
pr_cont(" BLITTER");
} if (hwreg_present((void *)0xfff00039)) {
ATARIHW_SET(IDE);
pr_cont(" 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)
;
pr_cont(" MICROWIRE");
} #endif if (hwreg_present(&tt_rtc.regsel)) {
ATARIHW_SET(TT_CLK);
pr_cont(" TT_CLK");
mach_hwclk = atari_tt_hwclk;
} if (hwreg_present(&mste_rtc.sec_ones)) {
ATARIHW_SET(MSTE_CLK);
pr_cont(" MSTE_CLK");
mach_hwclk = atari_mste_hwclk;
} if (!MACH_IS_MEDUSA && hwreg_present(&dma_wd.fdc_speed) &&
hwreg_write(&dma_wd.fdc_speed, 0)) {
ATARIHW_SET(FDCSPEED);
pr_cont(" FDC_SPEED");
} if (!ATARIHW_PRESENT(ST_SCSI)) {
ATARIHW_SET(ACSI);
pr_cont(" ACSI");
}
pr_cont("\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...)
*/ asmvolatile ("\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.
*/
/* 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 : *(unsignedshort *)0xff000002;
atari_rtc_year_offset = (tos_version < 0x306) ? 70 : 68;
}
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 */
staticvoid 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 :
*(unsignedlong *) 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(); asmvolatile ("movec %0,%%vbr"
: : "d" (0));
if (CPU_IS_040_OR_060) { unsignedlong jmp_addr040 = virt_to_phys(&&jmp_addr_label040); if (CPU_IS_060) { /* 68060: clear PCR to turn off superscalar operation */ asmvolatile ("\n" " .chip 68060\n" " movec %0,%%pcr\n" " .chip 68k"
: : "d" (0));
}
asmvolatile ("\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: asmvolatile ("\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 asmvolatile ("\n" " pmove %0,%%tc\n" " jmp %1@"
: /* no outputs */
: "m" (tc_val), "a" (reset_addr));
}
staticvoid 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;
}
}
staticvoid 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)
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