1 // SPDX-License-Identifier: GPL-2.0-only
3  * Copyright (C) 2006 PA Semi, Inc
5  * Authors: Kip Walker, PA Semi
6  *	    Olof Johansson, PA Semi
18 #include <asm/pci-bridge.h>
19 #include <asm/isa-bridge.h>
22 #include <asm/ppc-pci.h>
28 static inline int pa_pxp_offset_valid(u8 bus, u8 devfn, int offset)  in pa_pxp_offset_valid()
31 	 * well, so allow larger offset. It's really a two-function device but the  in pa_pxp_offset_valid()
40 static void volatile __iomem *pa_pxp_cfg_addr(struct pci_controller *hose,  in pa_pxp_cfg_addr()
43 	return hose->cfg_data + PA_PXP_CFA(bus, devfn, offset);  in pa_pxp_cfg_addr()
46 static inline int is_root_port(int busno, int devfn)  in is_root_port()
52 static inline int is_5945_reg(int reg)  in is_5945_reg()
58 static int workaround_5945(struct pci_bus *bus, unsigned int devfn,  in workaround_5945()
66 	if (!is_root_port(bus->number, devfn) || !is_5945_reg(offset))  in workaround_5945()
71 	addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset & ~0x3);  in workaround_5945()
75 	 * and write back what we read. We must read/write the full 32-bit  in workaround_5945()
78 	dummy = pa_pxp_cfg_addr(hose, bus->number, devfn, 0x10);  in workaround_5945()
106 static void sb600_set_flag(int bus)  in sb600_set_flag()
108 	static void __iomem *iob_mapbase = NULL;  in sb600_set_flag()
114 		dn = of_find_compatible_node(NULL, "isa", "pasemi,1682m-iob");  in sb600_set_flag()
136 			 * This is the SB600's bus, tell the PCI-e root port  in sb600_set_flag()
137 			 * to allow non-zero devices to enumerate.  in sb600_set_flag()
151 static void sb600_set_flag(int bus)  in sb600_set_flag()
156 static int pa_pxp_read_config(struct pci_bus *bus, unsigned int devfn,  in pa_pxp_read_config()
166 	if (!pa_pxp_offset_valid(bus->number, devfn, offset))  in pa_pxp_read_config()
172 	addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset);  in pa_pxp_read_config()
174 	sb600_set_flag(bus->number);  in pa_pxp_read_config()
195 static int pa_pxp_write_config(struct pci_bus *bus, unsigned int devfn,  in pa_pxp_write_config()
205 	if (!pa_pxp_offset_valid(bus->number, devfn, offset))  in pa_pxp_write_config()
208 	addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset);  in pa_pxp_write_config()
210 	sb600_set_flag(bus->number);  in pa_pxp_write_config()
230 static struct pci_ops pa_pxp_ops = {
235 static void __init setup_pa_pxp(struct pci_controller *hose)  in setup_pa_pxp()
237 	hose->ops = &pa_pxp_ops;  in setup_pa_pxp()
238 	hose->cfg_data = ioremap(0xe0000000, 0x10000000);  in setup_pa_pxp()
241 static int __init pas_add_bridge(struct device_node *dev)  in pas_add_bridge()
249 		return -ENOMEM;  in pas_add_bridge()
251 	hose->first_busno = 0;  in pas_add_bridge()
252 	hose->last_busno = 0xff;  in pas_add_bridge()
253 	hose->controller_ops = pasemi_pci_controller_ops;  in pas_add_bridge()
257 	pr_info("Found PA-PXP PCI host bridge.\n");  in pas_add_bridge()
291 	hose = pci_bus_to_host(dev->bus);  in pasemi_pci_getcfgaddr()
293 	return (void __iomem *)pa_pxp_cfg_addr(hose, dev->bus->number, dev->devfn, offset);  in pasemi_pci_getcfgaddr()