Re: Problem in accessing PCI I/O Registers in MPC8247


gvarndell wrote:
lichlin wrote:
Hi All
I'm facing a problem in accessing my card's (PCI2IDE) registers. If
anyone of you could help me to fix this, it would be of great help.

I can scan the card in PCI bus.

==============================================================
Scanning function 0 of each PCI device on bus 0
Using configuration mechanism 0
bus device function vendorID deviceID class
00000000 00000000 00000000 00001057 000018c1 00060000
00000000 0000001a 00000000 00001283 00008212 00010400

==============================================================
The macro about PCI part:
/* PCI based addresses */
#define PCI_MEM_ADRS 0x80000000
#define PCI_MEM_SIZE 0x01000000 /*16MB */
#define PCI_MEM_SIZE_MASK PCI_SIZE_MASK_16M
#define PCI_MEMIO_ADRS 0x90000000
#define PCI_MEMIO_SIZE 0x01000000 /*16MB */
#define PCI_MEMIO_SIZE_MASK PCI_SIZE_MASK_16M
#define PCI_IO_ADRS 0xa0000000
#define PCI_IO_SIZE 0x00100000 /* IO Space is not available */


/* CPU based addresses */
#define CPU_PCI_MEM_ADRS PCI_MEM_ADRS
#define CPU_PCI_MEM_SIZE PCI_MEM_SIZE
#define CPU_PCI_MEMIO_ADRS PCI_MEMIO_ADRS
#define CPU_PCI_MEMIO_SIZE PCI_MEMIO_SIZE
#define CPU_PCI_IO_ADRS PCI_IO_ADRS
#define CPU_PCI_IO_SIZE PCI_IO_SIZE


And CPU_PCI_MEM_ADRS, CPU_PCI_MEMIO_ADRS, CPU_PCI_IO_ADRS ware added
into the struct sysPhysMemDesc[] in file syslib.c. Use
sysPciAutoConfig(). But when i use sysOutByte() and sysInByte() or W/R
of memory directly to access the io registers of PCI, the exception
occurs.
For example:
sysOutByte( CPU_PCI_IO_ADRS+reg, value );
or
value = *(char *)(CPU_PCI_IO_ADRS+reg);


In the future, please specifiy which vxWorks version you're using.

You're assuming your device was assigned the base address of IO space
-- probably not.
Use pciConfigTopoShow or pciHeaderShow to see if/how that PCI BARs were
setup by auto config.
This will tell you where the device's mem and IO spaces actually are.
Once you know that, you may be done -- but there could be other
problems.

GV

Thank you very much, GV

My vxworks' version is 5.5.

And the print message of pciConfigTopoShow() is followed:
===============================================================
[0,0,0] type=HOST BRIDGE
status=0x20b0 ( CAP 66MHZ FBTB DEVSEL=0 MSTR_ABORT_RCV )
command=0x0006 ( MEM_ENABLE MASTER_ENABLE )
bar0 in 32-bit mem space @ 0x40000000
bar1 in prefetchable 32-bit mem space @ 0x00000000
[0,26,0] type=MASS STORAGE
status=0x0230 ( CAP 66MHZ DEVSEL=1 )
command=0x0005 ( IO_ENABLE MASTER_ENABLE )
bar0 in I/O space @ 0xf0000000
bar1 in I/O space @ 0xf0000008
bar2 in I/O space @ 0xf0000010
bar3 in I/O space @ 0xf0000018
bar4 in I/O space @ 0xf0000020
===============================================================

And pciHeaderShow(0,0x1a,0):
===============================================================
vendor ID = 0x1283
device ID = 0x8212
command register = 0x0005
status register = 0x0230
revision ID = 0x13
class code = 0x01
sub class code = 0x04
programming interface = 0x00
cache line = 0x00
latency time = 0x40
header type = 0x00
BIST = 0x00
base address 0 = 0xf0000001
base address 1 = 0xf0000009
base address 2 = 0xf0000011
base address 3 = 0xf0000019
base address 4 = 0xf0000021
base address 5 = 0x00000000
cardBus CIS pointer = 0x00000000
sub system vendor ID = 0x0000
sub system ID = 0x0000
expansion ROM base address = 0x00000000
interrupt line = 0x01
interrupt pin = 0x01
min Grant = 0x08
max Latency = 0x08
==========================================================

I know the value of BARx, but i cannot do access to IO space. If i want
to write/read IO address 0xf0000001, how to do? I use sysOutByte(
0xf0000001, 0x99) , but exception occurs.

.

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