On Apr 24, 2009, at 9:11 AM, Joakim Tjernlund wrote:
Scott Wood scottwood@freescale.com wrote on 23/04/2009 18:40:01:
On Thu, Apr 23, 2009 at 03:32:11PM +0200, Joakim Tjernlund wrote:
Still trying to wrap my head around PCI and I wonder if I need to do
some
HW init in u-boot in order to use the PCI controller in Linux?
Yes. See pci_init_board() in mpc8323erdb for an example.
Thanks Scott, this was very helpful.
I am trying to map the "ranges" property in the OF tree and I am looking at the dts files in the kernel tree. There are three that comes somewhat close but they all have somewhat different "ranges" propery:
mpc832x_mds.dts: ranges = <0x02000000 0x0 0x90000000 0x90000000 0x0 0x10000000
this is PCI MMIO non-prefetch @ 0x90000000 (cpu & pci) of size 256M
0x42000000 0x0 0x80000000 0x80000000 0x0 0x10000000
this is PCI MMIO prefetch @ 0x80000000 (cpu & pci) of size 256M
0x01000000 0x0 0x00000000 0xd0000000 0x0 0x00100000>;
this is PCI IO @ @ cpu phy 0xd0000000 pci io 0x0 of size 1M
mpc832x_rdb.dts: ranges = <0x42000000 0x0 0x80000000 0x80000000 0x0 0x10000000 0x02000000 0x0 0x90000000 0x90000000 0x0 0x10000000 0x01000000 0x0 0xd0000000 0xd0000000 0x0 0x04000000>;
mpc8313erdb.dts: ranges = <0x02000000 0x0 0x90000000 0x90000000 0x0 0x10000000 0x42000000 0x0 0x80000000 0x80000000 0x0 0x10000000 0x01000000 0x0 0x00000000 0xe2000000 0x0 0x00100000>;
Don't understand how I should do here. Just select the mpc832x_rdb.dts "ranges" and define my base addresses similarly? #define CFG_PCI1_MEM_BASE 0x80000000 #define CFG_PCI1_MEM_PHYS CFG_PCI1_MEM_BASE #define CFG_PCI1_MEM_SIZE 0x10000000 /* 256M */ #define CFG_PCI1_MMIO_BASE 0x90000000 #define CFG_PCI1_MMIO_PHYS CFG_PCI1_MMIO_BASE #define CFG_PCI1_MMIO_SIZE 0x10000000 /* 256M */ #define CFG_PCI1_IO_BASE 0xd0000000 #define CFG_PCI1_IO_PHYS CFG_PCI1_IO_BASE #define CFG_PCI1_IO_SIZE 0x4000000 /* 64M */
this is overkill for IO, 64k is the max. (its probably inherited when we didn't know better).
- k