From d4cb2d17946466740afeb195a57d6cb290bf4cc0 Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Sat, 13 Oct 2007 16:43:23 +0200 Subject: ppc4xx: Dynamic configuration of 4xx PCIe mode as root or endpoint mode This patch adds support for dynamic configuration of PCIe ports for the AMCC PPC4xx boards equipped with PCIe interfaces. These are the PPC440SPe boards Yucca & Katmai and the 405EX board Kilauea. This dynamic configuration is done via the "pcie_mode" environement variable. This variable can be set to "EP" or "RP" for endpoint or rootpoint mode. Multiple values can be joined via the ":" delimiter. Here an example: pcie_mode=RP:EP:EP This way, PCIe port 0 will be configured as rootpoint, PCIe port 1 and 2 as endpoint. Per default Yucca will be configured as: pcie_mode=RP:EP:EP Per default Katmai will be configured as: pcie_mode=RP:RP:REP Per default Kilauea will be configured as: pcie_mode=RP:RP Signed-off-by: Tirumala R Marri Signed-off-by: Stefan Roese --- cpu/ppc4xx/4xx_pcie.c | 22 +++++++++++++++++++++- 1 file changed, 21 insertions(+), 1 deletion(-) (limited to 'cpu') diff --git a/cpu/ppc4xx/4xx_pcie.c b/cpu/ppc4xx/4xx_pcie.c index 7ee0e5b..9ab3588 100644 --- a/cpu/ppc4xx/4xx_pcie.c +++ b/cpu/ppc4xx/4xx_pcie.c @@ -46,6 +46,20 @@ enum { LNKW_X8 = 0x8 }; +static int validate_endpoint(struct pci_controller *hose) +{ + if (hose->cfg_data == (u8 *)CFG_PCIE0_CFGBASE) + return (is_end_point(0)); + else if (hose->cfg_data == (u8 *)CFG_PCIE1_CFGBASE) + return (is_end_point(1)); +#if CFG_PCIE_NR_PORTS > 2 + else if (hose->cfg_data == (u8 *)CFG_PCIE2_CFGBASE) + return (is_end_point(2)); +#endif + + return 0; +} + static u8* pcie_get_base(struct pci_controller *hose, unsigned int devfn) { u8 *base = (u8*)hose->cfg_data; @@ -95,6 +109,9 @@ static int pcie_read_config(struct pci_controller *hose, unsigned int devfn, u8 *address; *val = 0; + if (validate_endpoint(hose)) + return 0; /* No upstream config access */ + /* * Bus numbers are relative to hose->first_busno */ @@ -150,6 +167,9 @@ static int pcie_write_config(struct pci_controller *hose, unsigned int devfn, u8 *address; + if (validate_endpoint(hose)) + return 0; /* No upstream config access */ + /* * Bus numbers are relative to hose->first_busno */ @@ -595,9 +615,9 @@ int ppc4xx_init_pcie_port(int port, int rootport) u32 low, high; if (!core_init) { - ++core_init; if (ppc4xx_init_pcie()) return -1; + ++core_init; } /* -- cgit v1.1