On 11/18/2009 08:34 AM, Oncaphillis wrote:
> The first ioread16 actually succeeds, only the second one fails.
> My lspci -vnn tells me that the memory is:
>
> Memory at 57100000 (64-bit, non-prefetchable) [size=16K]
>
> Could it be that one has to make a ioread32 here since the
> memory is 64-bit ? I remember very very remotely that
> in older days it was impossible or even forbidden to read
> data from addresses which are not a multiple of 2/4/8 what
> so ever. But that was pre-PCI.
As long as a 16-bit read is aligned on an even address, it should be OK;
however, to check completely, please try this patch:
Index: wireless-testing/drivers/ssb/pci.c
===================================================================
--- wireless-testing.orig/drivers/ssb/pci.c
+++ wireless-testing/drivers/ssb/pci.c
@@ -251,10 +251,16 @@ static int sprom_check_crc(const u16 *sp
static int sprom_do_read(struct ssb_bus *bus, u16 *sprom)
{
int i;
+ u32 buf;
- for (i = 0; i < bus->sprom_size; i++)
- sprom[i] = ioread16(bus->mmio + SSB_SPROM_BASE + (i * 2));
-
+ printk(KERN_INFO "ssb: Entering %s\n", __func__);
+ for (i = 0; i < bus->sprom_size; i = i + 2) {
+ buf = ioread32(bus->mmio + SSB_SPROM_BASE + (i * 2));
+ printk(KERN_INFO "ssb: Read 0x%.8X from SPROM\n", buf);
+ sprom[i] = buf & 0x0000FFFF;
+ sprom[i+1] = (buf >> 16) & 0x0000FFFF;
+ }
+ printk(KERN_INFO "ssb: Leaving %s\n", __func__);
return 0;
}
Larry
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