1 // SPDX-License-Identifier: GPL-2.0
11  * This interrupt-safe spinlock protects all accesses to PCI
19  * alignment, do locking and call the low-level functions pointed to
20  * by pci_dev->ops.
37 	(struct pci_bus *bus, unsigned int devfn, int pos, type *value)	\
44 	res = bus->ops->read(bus, devfn, pos, len, &data);		\
55 	(struct pci_bus *bus, unsigned int devfn, int pos, type value)	\
61 	res = bus->ops->write(bus, devfn, pos, len, value);		\
80 int pci_generic_config_read(struct pci_bus *bus, unsigned int devfn,  in pci_generic_config_read()  argument
83 	void __iomem *addr;  in pci_generic_config_read()  local
85 	addr = bus->ops->map_bus(bus, devfn, where);  in pci_generic_config_read()
86 	if (!addr)  in pci_generic_config_read()
90 		*val = readb(addr);  in pci_generic_config_read()
92 		*val = readw(addr);  in pci_generic_config_read()
94 		*val = readl(addr);  in pci_generic_config_read()
100 int pci_generic_config_write(struct pci_bus *bus, unsigned int devfn,  in pci_generic_config_write()  argument
103 	void __iomem *addr;  in pci_generic_config_write()  local
105 	addr = bus->ops->map_bus(bus, devfn, where);  in pci_generic_config_write()
106 	if (!addr)  in pci_generic_config_write()
110 		writeb(val, addr);  in pci_generic_config_write()
112 		writew(val, addr);  in pci_generic_config_write()
114 		writel(val, addr);  in pci_generic_config_write()
120 int pci_generic_config_read32(struct pci_bus *bus, unsigned int devfn,  in pci_generic_config_read32()  argument
123 	void __iomem *addr;  in pci_generic_config_read32()  local
125 	addr = bus->ops->map_bus(bus, devfn, where & ~0x3);  in pci_generic_config_read32()
126 	if (!addr)  in pci_generic_config_read32()
129 	*val = readl(addr);  in pci_generic_config_read32()
132 		*val = (*val >> (8 * (where & 3))) & ((1 << (size * 8)) - 1);  in pci_generic_config_read32()
138 int pci_generic_config_write32(struct pci_bus *bus, unsigned int devfn,  in pci_generic_config_write32()  argument
141 	void __iomem *addr;  in pci_generic_config_write32()  local
144 	addr = bus->ops->map_bus(bus, devfn, where & ~0x3);  in pci_generic_config_write32()
145 	if (!addr)  in pci_generic_config_write32()
149 		writel(val, addr);  in pci_generic_config_write32()
154 	 * In general, hardware that supports only 32-bit writes on PCI is  in pci_generic_config_write32()
155 	 * not spec-compliant.  For example, software may perform a 16-bit  in pci_generic_config_write32()
156 	 * write.  If the hardware only supports 32-bit accesses, we must  in pci_generic_config_write32()
157 	 * do a 32-bit read, merge in the 16 bits we intend to write,  in pci_generic_config_write32()
158 	 * followed by a 32-bit write.  If the 16 bits we *don't* intend to  in pci_generic_config_write32()
159 	 * write happen to have any RW1C (write-one-to-clear) bits set, we  in pci_generic_config_write32()
162 	if (!bus->unsafe_warn) {  in pci_generic_config_write32()
163 …dev_warn(&bus->dev, "%d-byte config write to %04x:%02x:%02x.%d offset %#x may corrupt adjacent RW1…  in pci_generic_config_write32()
164 			 size, pci_domain_nr(bus), bus->number,  in pci_generic_config_write32()
166 		bus->unsafe_warn = 1;  in pci_generic_config_write32()
169 	mask = ~(((1 << (size * 8)) - 1) << ((where & 0x3) * 8));  in pci_generic_config_write32()
170 	tmp = readl(addr) & mask;  in pci_generic_config_write32()
172 	writel(tmp, addr);  in pci_generic_config_write32()
179  * pci_bus_set_ops - Set raw operations of pci bus
180  * @bus:	pci bus struct
185 struct pci_ops *pci_bus_set_ops(struct pci_bus *bus, struct pci_ops *ops)  in pci_bus_set_ops()  argument
191 	old_ops = bus->ops;  in pci_bus_set_ops()
192 	bus->ops = ops;  in pci_bus_set_ops()
201  * we're required to prevent it during D-state transitions.
213 		wait_event(pci_cfg_wait, !dev->block_cfg_access);  in pci_wait_cfg()
215 	} while (dev->block_cfg_access);  in pci_wait_cfg()
224 	u32 data = -1;							\
226 		return -EINVAL;						\
228 	if (unlikely(dev->block_cfg_access))				\
230 	ret = dev->bus->ops->read(dev->bus, dev->devfn,			\
248 		return -EINVAL;						\
250 	if (unlikely(dev->block_cfg_access))				\
252 	ret = dev->bus->ops->write(dev->bus, dev->devfn,		\
267  * pci_cfg_access_lock - Lock PCI config reads/writes  in PCI_USER_READ_CONFIG()
279 	if (dev->block_cfg_access)  in PCI_USER_READ_CONFIG()
281 	dev->block_cfg_access = 1;  in PCI_USER_READ_CONFIG()
287  * pci_cfg_access_trylock - try to lock PCI config reads/writes
300 	if (dev->block_cfg_access)  in pci_cfg_access_trylock()
303 		dev->block_cfg_access = 1;  in pci_cfg_access_trylock()
311  * pci_cfg_access_unlock - Unlock PCI config reads/writes
324 	 * to kill them, unlike a double-block above.  in pci_cfg_access_unlock()
326 	WARN_ON(!dev->block_cfg_access);  in pci_cfg_access_unlock()
328 	dev->block_cfg_access = 0;  in pci_cfg_access_unlock()
534 	return pci_bus_read_config_byte(dev->bus, dev->devfn, where, val);  in pci_read_config_byte()
544 	return pci_bus_read_config_word(dev->bus, dev->devfn, where, val);  in pci_read_config_word()
555 	return pci_bus_read_config_dword(dev->bus, dev->devfn, where, val);  in pci_read_config_dword()
563 	return pci_bus_write_config_byte(dev->bus, dev->devfn, where, val);  in pci_write_config_byte()
571 	return pci_bus_write_config_word(dev->bus, dev->devfn, where, val);  in pci_write_config_word()
580 	return pci_bus_write_config_dword(dev->bus, dev->devfn, where, val);  in pci_write_config_dword()