1 // SPDX-License-Identifier: GPL-2.0
3  * Generic SH7786 PCI-Express operations.
5  *  Copyright (C) 2009 - 2010  Paul Mundt
12 #include "pcie-sh7786.h"
20 		struct pci_bus *bus, unsigned int devfn, int where, u32 *data)  in sh7786_pcie_config_access()  argument
22 	struct pci_channel *chan = bus->sysdata;  in sh7786_pcie_config_access()
27 	type = !!bus->parent;  in sh7786_pcie_config_access()
30 	if (bus->number > 255 || dev > 31 || func > 7)  in sh7786_pcie_config_access()
34 	 * While each channel has its own memory-mapped extended config  in sh7786_pcie_config_access()
42 	 * the same channel <-> device access works for any PCI_SLOT()  in sh7786_pcie_config_access()
44 	 * space to devfn 0 in order to enable self-enumeration. In this  in sh7786_pcie_config_access()
48 	if (pci_is_root_bus(bus)) {  in sh7786_pcie_config_access()
51 				*data = pci_read_reg(chan, PCI_REG(reg));  in sh7786_pcie_config_access()
53 				pci_write_reg(chan, *data, PCI_REG(reg));  in sh7786_pcie_config_access()
64 	pci_write_reg(chan, (bus->number << 24) | (dev << 19) |  in sh7786_pcie_config_access()
79 		*data = pci_read_reg(chan, SH4A_PCIEPDR);  in sh7786_pcie_config_access()
81 		pci_write_reg(chan, *data, SH4A_PCIEPDR);  in sh7786_pcie_config_access()
89 static int sh7786_pcie_read(struct pci_bus *bus, unsigned int devfn,  in sh7786_pcie_read()  argument
94 	u32 data;  in sh7786_pcie_read()  local
102 	ret = sh7786_pcie_config_access(PCI_ACCESS_READ, bus,  in sh7786_pcie_read()
103 					devfn, where, &data);  in sh7786_pcie_read()
110 		*val = (data >> ((where & 3) << 3)) & 0xff;  in sh7786_pcie_read()
112 		*val = (data >> ((where & 2) << 3)) & 0xffff;  in sh7786_pcie_read()
114 		*val = data;  in sh7786_pcie_read()
116 	dev_dbg(&bus->dev, "pcie-config-read: bus=%3d devfn=0x%04x "  in sh7786_pcie_read()
117 		"where=0x%04x size=%d val=0x%08lx\n", bus->number,  in sh7786_pcie_read()
125 static int sh7786_pcie_write(struct pci_bus *bus, unsigned int devfn,  in sh7786_pcie_write()  argument
130 	u32 data;  in sh7786_pcie_write()  local
138 	ret = sh7786_pcie_config_access(PCI_ACCESS_READ, bus,  in sh7786_pcie_write()
139 					devfn, where, &data);  in sh7786_pcie_write()
143 	dev_dbg(&bus->dev, "pcie-config-write: bus=%3d devfn=0x%04x "  in sh7786_pcie_write()
144 		"where=0x%04x size=%d val=%08lx\n", bus->number,  in sh7786_pcie_write()
149 		data &= ~(0xff << shift);  in sh7786_pcie_write()
150 		data |= ((val & 0xff) << shift);  in sh7786_pcie_write()
153 		data &= ~(0xffff << shift);  in sh7786_pcie_write()
154 		data |= ((val & 0xffff) << shift);  in sh7786_pcie_write()
156 		data = val;  in sh7786_pcie_write()
158 	ret = sh7786_pcie_config_access(PCI_ACCESS_WRITE, bus,  in sh7786_pcie_write()
159 					devfn, where, &data);  in sh7786_pcie_write()