diff options
Diffstat (limited to 'sound/isa/sb/emu8000.c')
| -rw-r--r-- | sound/isa/sb/emu8000.c | 31 |
1 files changed, 15 insertions, 16 deletions
diff --git a/sound/isa/sb/emu8000.c b/sound/isa/sb/emu8000.c index 45fcdff611f9..d25e384fa8c9 100644 --- a/sound/isa/sb/emu8000.c +++ b/sound/isa/sb/emu8000.c @@ -378,13 +378,12 @@ init_arrays(struct snd_emu8000 *emu) static void size_dram(struct snd_emu8000 *emu) { - int i, size, detected_size; + int i, size; if (emu->dram_checked) return; size = 0; - detected_size = 0; /* write out a magic number */ snd_emu8000_dma_chan(emu, 0, EMU8000_RAM_WRITE); @@ -392,10 +391,19 @@ size_dram(struct snd_emu8000 *emu) EMU8000_SMALW_WRITE(emu, EMU8000_DRAM_OFFSET); EMU8000_SMLD_WRITE(emu, UNIQUE_ID1); snd_emu8000_init_fm(emu); /* This must really be here and not 2 lines back even */ + snd_emu8000_write_wait(emu); - while (size < EMU8000_MAX_DRAM) { + /* + * Detect first 512 KiB. If a write succeeds at the beginning of a + * 512 KiB page we assume that the whole page is there. + */ + EMU8000_SMALR_WRITE(emu, EMU8000_DRAM_OFFSET); + EMU8000_SMLD_READ(emu); /* discard stale data */ + if (EMU8000_SMLD_READ(emu) != UNIQUE_ID1) + goto skip_detect; /* No RAM */ + snd_emu8000_read_wait(emu); - size += 512 * 1024; /* increment 512kbytes */ + for (size = 512 * 1024; size < EMU8000_MAX_DRAM; size += 512 * 1024) { /* Write a unique data on the test address. * if the address is out of range, the data is written on @@ -431,18 +439,9 @@ size_dram(struct snd_emu8000 *emu) snd_emu8000_read_wait(emu); /* Otherwise, it's valid memory. */ - detected_size = size + 512 * 1024; - } - - /* Distinguish 512 KiB from 0. */ - if (detected_size == 0) { - snd_emu8000_read_wait(emu); - EMU8000_SMALR_WRITE(emu, EMU8000_DRAM_OFFSET); - EMU8000_SMLD_READ(emu); /* discard stale data */ - if (EMU8000_SMLD_READ(emu) == UNIQUE_ID1) - detected_size = 512 * 1024; } +skip_detect: /* wait until FULL bit in SMAxW register is false */ for (i = 0; i < 10000; i++) { if ((EMU8000_SMALW_READ(emu) & 0x80000000) == 0) @@ -455,9 +454,9 @@ size_dram(struct snd_emu8000 *emu) snd_emu8000_dma_chan(emu, 1, EMU8000_RAM_CLOSE); snd_printdd("EMU8000 [0x%lx]: %d Kb on-board memory detected\n", - emu->port1, detected_size/1024); + emu->port1, size/1024); - emu->mem_size = detected_size; + emu->mem_size = size; emu->dram_checked = 1; } |