Date: Thu, 20 Dec 2001 16:55:19 -0800 From: "Anuranjan" <anu@nttmcl.com> To: <questions@freebsd.org> Subject: Memory mapped device Message-ID: <015401c189ba$2a52db00$f64545d8@ntt27f48otgmw8>
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Hi ,
I'm trying to write some driver code for a memory mapped device (PCI bus).
struct xxx_softc *sc = device_get_softc(dev);
struct resource *res;
/*
* Map control/status registers.
*/
command = pci_read_config(dev, PCIR_COMMAND, 4);
command |= (PCIM_CMD_MEMEN | PCIM_CMD_BUSMASTEREN);
pci_write_config(dev, PCIR_COMMAND, command, 4);
command = pci_read_config(dev, PCIR_COMMAND, 4);
if (!(command & PCIM_CMD_MEMEN)) {
printf("xxx%d: failed to enable memory mapping!\n", unit);
error = ENXIO;
goto fail;
}
else
printf("xxx%d: memory mapping enabled\n", unit);
mem_rid = 0x10;
res = bus_alloc_resource(dev, SYS_RES_MEMORY, &mem_rid,
0ul, ~0ul, size, RF_ACTIVE);
I've been able to probe the device correctly, get the IRQ resource allocated
correctly etc, I don't get any errors in this mapping enable and alloc code
either. But when I try accessing the device I don't get the correct results
(can't get to the eeprom, and can't access correct values from the register
offsets.
u_int32_t s = bus_space_read_4(sc->btag, sc->bhandle, REGISTER_OFFSET);
The device is basically a Cardbus card attached to the freebsd 4.3 PCI bus
through a Cardbus/PCI extender card.
I don't know exactly why it couldn't be working here. Is it the problem with
the mapping, or is it with the device, or with the freeBSD mechanism? I'm a
newbie so please excuse me if I'm posting this at the wrong forum and let me
know the right place to go to.
Thanks in advance
A
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