diff options
Diffstat (limited to 'arch/powerpc/platforms/pasemi/pci.c')
| -rw-r--r-- | arch/powerpc/platforms/pasemi/pci.c | 115 |
1 files changed, 85 insertions, 30 deletions
diff --git a/arch/powerpc/platforms/pasemi/pci.c b/arch/powerpc/platforms/pasemi/pci.c index aa862713258c..60f990a336c4 100644 --- a/arch/powerpc/platforms/pasemi/pci.c +++ b/arch/powerpc/platforms/pasemi/pci.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-only /* * Copyright (C) 2006 PA Semi, Inc * @@ -7,30 +8,21 @@ * Maintained by: Olof Johansson <olof@lixom.net> * * Based on arch/powerpc/platforms/maple/pci.c - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 2 as - * published by the Free Software Foundation. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <linux/kernel.h> +#include <linux/of_address.h> #include <linux/pci.h> #include <asm/pci-bridge.h> +#include <asm/isa-bridge.h> #include <asm/machdep.h> #include <asm/ppc-pci.h> +#include "pasemi.h" + #define PA_PXP_CFA(bus, devfn, off) (((bus) << 20) | ((devfn) << 12) | (off)) static inline int pa_pxp_offset_valid(u8 bus, u8 devfn, int offset) @@ -106,6 +98,61 @@ static int workaround_5945(struct pci_bus *bus, unsigned int devfn, return 1; } +#ifdef CONFIG_PPC_PASEMI_NEMO +#define PXP_ERR_CFG_REG 0x4 +#define PXP_IGNORE_PCIE_ERRORS 0x800 +#define SB600_BUS 5 + +static void sb600_set_flag(int bus) +{ + static void __iomem *iob_mapbase = NULL; + struct resource res; + struct device_node *dn; + int err; + + if (iob_mapbase == NULL) { + dn = of_find_compatible_node(NULL, "isa", "pasemi,1682m-iob"); + if (!dn) { + pr_crit("NEMO SB600 missing iob node\n"); + return; + } + + err = of_address_to_resource(dn, 0, &res); + of_node_put(dn); + + if (err) { + pr_crit("NEMO SB600 missing resource\n"); + return; + } + + pr_info("NEMO SB600 IOB base %08llx\n",res.start); + + iob_mapbase = ioremap(res.start + 0x100, 0x94); + } + + if (iob_mapbase != NULL) { + if (bus == SB600_BUS) { + /* + * This is the SB600's bus, tell the PCI-e root port + * to allow non-zero devices to enumerate. + */ + out_le32(iob_mapbase + PXP_ERR_CFG_REG, in_le32(iob_mapbase + PXP_ERR_CFG_REG) | PXP_IGNORE_PCIE_ERRORS); + } else { + /* + * Only scan device 0 on other busses + */ + out_le32(iob_mapbase + PXP_ERR_CFG_REG, in_le32(iob_mapbase + PXP_ERR_CFG_REG) & ~PXP_IGNORE_PCIE_ERRORS); + } + } +} + +#else + +static void sb600_set_flag(int bus) +{ +} +#endif + static int pa_pxp_read_config(struct pci_bus *bus, unsigned int devfn, int offset, int len, u32 *val) { @@ -124,6 +171,8 @@ static int pa_pxp_read_config(struct pci_bus *bus, unsigned int devfn, addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset); + sb600_set_flag(bus->number); + /* * Note: the caller has already checked that offset is * suitably aligned and that len is 1, 2 or 4. @@ -158,6 +207,8 @@ static int pa_pxp_write_config(struct pci_bus *bus, unsigned int devfn, addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset); + sb600_set_flag(bus->number); + /* * Note: the caller has already checked that offset is * suitably aligned and that len is 1, 2 or 4. @@ -191,7 +242,7 @@ static int __init pas_add_bridge(struct device_node *dev) { struct pci_controller *hose; - pr_debug("Adding PCI host bridge %s\n", dev->full_name); + pr_debug("Adding PCI host bridge %pOF\n", dev); hose = pcibios_alloc_controller(dev); if (!hose) @@ -199,39 +250,41 @@ static int __init pas_add_bridge(struct device_node *dev) hose->first_busno = 0; hose->last_busno = 0xff; + hose->controller_ops = pasemi_pci_controller_ops; setup_pa_pxp(hose); - printk(KERN_INFO "Found PA-PXP PCI host bridge.\n"); + pr_info("Found PA-PXP PCI host bridge.\n"); /* Interpret the "ranges" property */ pci_process_bridge_OF_ranges(hose, dev, 1); + /* + * Scan for an isa bridge. This is needed to find the SB600 on the nemo + * and does nothing on machines without one. + */ + isa_bridge_find_early(hose); + return 0; } void __init pas_pci_init(void) { - struct device_node *np, *root; - - root = of_find_node_by_path("/"); - if (!root) { - printk(KERN_CRIT "pas_pci_init: can't find root " - "of device tree\n"); - return; - } + struct device_node *root = of_find_node_by_path("/"); + struct device_node *np; + int res; - for (np = NULL; (np = of_get_next_child(root, np)) != NULL;) - if (np->name && !strcmp(np->name, "pxp") && !pas_add_bridge(np)) - of_node_get(np); + pci_set_flags(PCI_SCAN_ALL_PCIE_DEVS); + np = of_find_compatible_node(root, NULL, "pasemi,rootbus"); + if (np) { + res = pas_add_bridge(np); + of_node_put(np); + } of_node_put(root); - - /* Setup the linkage between OF nodes and PHBs */ - pci_devs_phb_init(); } -void __iomem *pasemi_pci_getcfgaddr(struct pci_dev *dev, int offset) +void __iomem *__init pasemi_pci_getcfgaddr(struct pci_dev *dev, int offset) { struct pci_controller *hose; @@ -239,3 +292,5 @@ void __iomem *pasemi_pci_getcfgaddr(struct pci_dev *dev, int offset) return (void __iomem *)pa_pxp_cfg_addr(hose, dev->bus->number, dev->devfn, offset); } + +struct pci_controller_ops pasemi_pci_controller_ops; |