1 // SPDX-License-Identifier: GPL-2.0-only
17 #include <asm/pci-bridge.h>
18 #include <asm/isa-bridge.h>
21 #include <asm/ppc-pci.h>
25 #define PA_PXP_CFA(bus, devfn, off) (((bus) << 20) | ((devfn) << 12) | (off))  argument
27 static inline int pa_pxp_offset_valid(u8 bus, u8 devfn, int offset)  in pa_pxp_offset_valid()  argument
30 	 * well, so allow larger offset. It's really a two-function device but the  in pa_pxp_offset_valid()
33 	if (bus == 0 && devfn == 0)  in pa_pxp_offset_valid()
40 				       u8 bus, u8 devfn, int offset)  in pa_pxp_cfg_addr()  argument
42 	return hose->cfg_data + PA_PXP_CFA(bus, devfn, offset);  in pa_pxp_cfg_addr()
57 static int workaround_5945(struct pci_bus *bus, unsigned int devfn,  in workaround_5945()  argument
61 	void volatile __iomem *addr, *dummy;  in workaround_5945()  local
65 	if (!is_root_port(bus->number, devfn) || !is_5945_reg(offset))  in workaround_5945()
68 	hose = pci_bus_to_host(bus);  in workaround_5945()
70 	addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset & ~0x3);  in workaround_5945()
74 	 * and write back what we read. We must read/write the full 32-bit  in workaround_5945()
77 	dummy = pa_pxp_cfg_addr(hose, bus->number, devfn, 0x10);  in workaround_5945()
79 	tmp = in_le32(addr);  in workaround_5945()
80 	out_le32(addr, tmp);  in workaround_5945()
105 static void sb600_set_flag(int bus)  in sb600_set_flag()  argument
113 		dn = of_find_compatible_node(NULL, "isa", "pasemi,1682m-iob");  in sb600_set_flag()
133 		if (bus == SB600_BUS) {  in sb600_set_flag()
135 			 * This is the SB600's bus, tell the PCI-e root port  in sb600_set_flag()
136 			 * to allow non-zero devices to enumerate.  in sb600_set_flag()
150 static void sb600_set_flag(int bus)  in sb600_set_flag()  argument
155 static int pa_pxp_read_config(struct pci_bus *bus, unsigned int devfn,  in pa_pxp_read_config()  argument
159 	void volatile __iomem *addr;  in pa_pxp_read_config()  local
161 	hose = pci_bus_to_host(bus);  in pa_pxp_read_config()
165 	if (!pa_pxp_offset_valid(bus->number, devfn, offset))  in pa_pxp_read_config()
168 	if (workaround_5945(bus, devfn, offset, len, val))  in pa_pxp_read_config()
171 	addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset);  in pa_pxp_read_config()
173 	sb600_set_flag(bus->number);  in pa_pxp_read_config()
181 		*val = in_8(addr);  in pa_pxp_read_config()
184 		*val = in_le16(addr);  in pa_pxp_read_config()
187 		*val = in_le32(addr);  in pa_pxp_read_config()
194 static int pa_pxp_write_config(struct pci_bus *bus, unsigned int devfn,  in pa_pxp_write_config()  argument
198 	void volatile __iomem *addr;  in pa_pxp_write_config()  local
200 	hose = pci_bus_to_host(bus);  in pa_pxp_write_config()
204 	if (!pa_pxp_offset_valid(bus->number, devfn, offset))  in pa_pxp_write_config()
207 	addr = pa_pxp_cfg_addr(hose, bus->number, devfn, offset);  in pa_pxp_write_config()
209 	sb600_set_flag(bus->number);  in pa_pxp_write_config()
217 		out_8(addr, val);  in pa_pxp_write_config()
220 		out_le16(addr, val);  in pa_pxp_write_config()
223 		out_le32(addr, val);  in pa_pxp_write_config()
236 	hose->ops = &pa_pxp_ops;  in setup_pa_pxp()
237 	hose->cfg_data = ioremap(0xe0000000, 0x10000000);  in setup_pa_pxp()
248 		return -ENOMEM;  in pas_add_bridge()
250 	hose->first_busno = 0;  in pas_add_bridge()
251 	hose->last_busno = 0xff;  in pas_add_bridge()
252 	hose->controller_ops = pasemi_pci_controller_ops;  in pas_add_bridge()
256 	pr_info("Found PA-PXP PCI host bridge.\n");  in pas_add_bridge()
294 	hose = pci_bus_to_host(dev->bus);  in pasemi_pci_getcfgaddr()
296 	return (void __iomem *)pa_pxp_cfg_addr(hose, dev->bus->number, dev->devfn, offset);  in pasemi_pci_getcfgaddr()