Hi,
I could get PCI working on MBX860 with few changes to
qspan_pci.c file (see the patch below) on linux-2.4.21. Do
note that there are many copies of this file in different
directories (arch/ppc/kernel, arch/ppc/syslib,
arch/ppc/boot/simple). The one in boot/simple seems to be the
older one (qspan_init not required as PPC-BUG bootloader
initializes QSPAN correctly). I had patched the file in
ppc/kernel for linux-2.4.2x. Seems it is now moved to
ppc/syslib in linux-2.5/6 versions.
Another tip if you are working on MBX860 board. Both of my
boards had -12V on PC104-Plus bus missing! Do check pin A30 on
PC104+ for -12V. I had to provide an external -12V supply for
the PCI cards to make them work!
HTH...
Regards,
Praveen.
------% start of qspan.c patch %-------
--- qspan_pci-orig.c 2003-11-18 17:04:45.000000000 +0530
+++ qspan_pci.c 2003-11-24 09:21:58.000000000 +0530
@@ -83,7 +83,7 @@
" .align 2\n" \
" .long 1b,3b\n" \
".text" \
- : "=r"(x) : "r"(addr) : " %0")
+ : "=r"(x) : "r"(addr) : "%0")
#define QS_CONFIG_ADDR ((volatile uint *)(PCI_CSR_ADDR + 0x500))
#define QS_CONFIG_DATA ((volatile uint *)(PCI_CSR_ADDR + 0x504))
@@ -363,17 +363,53 @@
return PCIBIOS_DEVICE_NOT_FOUND;
}
+#define pcibios_access(host,rw,size,type) \
+int host##_pci_bios_##rw##_config_##size (struct pci_dev *dev, \
+ int pos, type value) \
+{ \
+ return host##_pcibios_##rw##_config_##size (dev->bus->number,\
+ dev->devfn, pos, value);
\
+}
+
+pcibios_access(qspan, read, byte, u8 *)
+pcibios_access(qspan, read, word, u16 *)
+pcibios_access(qspan, read, dword, u32 *)
+pcibios_access(qspan, write, byte, u8)
+pcibios_access(qspan, write, word, u16)
+pcibios_access(qspan, write, dword, u32)
+
+#define set_config_access_method(host) \
+static struct pci_ops pci_root_ops = { \
+ host##_pci_bios_read_config_byte, \
+ host##_pci_bios_read_config_word, \
+ host##_pci_bios_read_config_dword, \
+ host##_pci_bios_write_config_byte, \
+ host##_pci_bios_write_config_word, \
+ host##_pci_bios_write_config_dword \
+}
+
+set_config_access_method(qspan);
+
void __init
-m8xx_pcibios_fixup(void))
+m8xx_pcibios_fixup(void)
{
- /* Lots to do here, all board and configuration specific. */
}
void __init
-m8xx_setup_pci_ptrs(void))
+m8xx_setup_pci_ptrs(void)
{
- set_config_access_method(qspan);
+ struct pci_controller *hose = NULL;
- ppc_md.pcibios_fixup = m8xx_pcibios_fixup;
-}
+/* ppc_md.pcibios_fixup = m8xx_pcibios_fixup;*/
+
+ hose = pcibios_alloc_controller ();
+ if (!hose)
+ {
+ printk(KERN_ERR "PCI:Unable to allocate hose\n");
+ return;
+ }
+ hose->ops = &pci_root_ops;
+ hose->first_busno = 0;
+ hose->last_busno = 0xff;
+}
------% End of qspan.c patch %-------
-----Original Message-----
Subject: pci mbx860
From: Amit.Lubovsky at infineon.com
Date: Wed, 5 Nov 2003 09:07:38 +0100
I have to implement pci on MBX860 since the current code is
broken (I use 2.4.20 kernel from denx), Could anybody point me
to a sample implementation of pci as a starting and reference
point ?
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