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);		\
52 	(struct pci_bus *bus, unsigned int devfn, int pos, type value)	\
58 	res = bus->ops->write(bus, devfn, pos, len, value);		\
77 int pci_generic_config_read(struct pci_bus *bus, unsigned int devfn,  in pci_generic_config_read()  argument
80 	void __iomem *addr;  in pci_generic_config_read()  local
82 	addr = bus->ops->map_bus(bus, devfn, where);  in pci_generic_config_read()
83 	if (!addr) {  in pci_generic_config_read()
89 		*val = readb(addr);  in pci_generic_config_read()
91 		*val = readw(addr);  in pci_generic_config_read()
93 		*val = readl(addr);  in pci_generic_config_read()
99 int pci_generic_config_write(struct pci_bus *bus, unsigned int devfn,  in pci_generic_config_write()  argument
102 	void __iomem *addr;  in pci_generic_config_write()  local
104 	addr = bus->ops->map_bus(bus, devfn, where);  in pci_generic_config_write()
105 	if (!addr)  in pci_generic_config_write()
109 		writeb(val, addr);  in pci_generic_config_write()
111 		writew(val, addr);  in pci_generic_config_write()
113 		writel(val, addr);  in pci_generic_config_write()
119 int pci_generic_config_read32(struct pci_bus *bus, unsigned int devfn,  in pci_generic_config_read32()  argument
122 	void __iomem *addr;  in pci_generic_config_read32()  local
124 	addr = bus->ops->map_bus(bus, devfn, where & ~0x3);  in pci_generic_config_read32()
125 	if (!addr) {  in pci_generic_config_read32()
130 	*val = readl(addr);  in pci_generic_config_read32()
133 		*val = (*val >> (8 * (where & 3))) & ((1 << (size * 8)) - 1);  in pci_generic_config_read32()
139 int pci_generic_config_write32(struct pci_bus *bus, unsigned int devfn,  in pci_generic_config_write32()  argument
142 	void __iomem *addr;  in pci_generic_config_write32()  local
145 	addr = bus->ops->map_bus(bus, devfn, where & ~0x3);  in pci_generic_config_write32()
146 	if (!addr)  in pci_generic_config_write32()
150 		writel(val, addr);  in pci_generic_config_write32()
155 	 * In general, hardware that supports only 32-bit writes on PCI is  in pci_generic_config_write32()
156 	 * not spec-compliant.  For example, software may perform a 16-bit  in pci_generic_config_write32()
157 	 * write.  If the hardware only supports 32-bit accesses, we must  in pci_generic_config_write32()
158 	 * do a 32-bit read, merge in the 16 bits we intend to write,  in pci_generic_config_write32()
159 	 * followed by a 32-bit write.  If the 16 bits we *don't* intend to  in pci_generic_config_write32()
160 	 * write happen to have any RW1C (write-one-to-clear) bits set, we  in pci_generic_config_write32()
163 …dev_warn_ratelimited(&bus->dev, "%d-byte config write to %04x:%02x:%02x.%d offset %#x may corrupt …  in pci_generic_config_write32()
164 			     size, pci_domain_nr(bus), bus->number,  in pci_generic_config_write32()
167 	mask = ~(((1 << (size * 8)) - 1) << ((where & 0x3) * 8));  in pci_generic_config_write32()
168 	tmp = readl(addr) & mask;  in pci_generic_config_write32()
170 	writel(tmp, addr);  in pci_generic_config_write32()
177  * pci_bus_set_ops - Set raw operations of pci bus
178  * @bus:	pci bus struct
183 struct pci_ops *pci_bus_set_ops(struct pci_bus *bus, struct pci_ops *ops)  in pci_bus_set_ops()  argument
189 	old_ops = bus->ops;  in pci_bus_set_ops()
190 	bus->ops = ops;  in pci_bus_set_ops()
199  * we're required to prevent it during D-state transitions.
211 		wait_event(pci_cfg_wait, !dev->block_cfg_access);  in pci_wait_cfg()
213 	} while (dev->block_cfg_access);  in pci_wait_cfg()
222 	u32 data = -1;							\
224 		return -EINVAL;						\
226 	if (unlikely(dev->block_cfg_access))				\
228 	ret = dev->bus->ops->read(dev->bus, dev->devfn,			\
243 		return -EINVAL;						\
245 	if (unlikely(dev->block_cfg_access))				\
247 	ret = dev->bus->ops->write(dev->bus, dev->devfn,		\
262  * pci_cfg_access_lock - Lock PCI config reads/writes  in PCI_USER_READ_CONFIG()
274 	if (dev->block_cfg_access)  in PCI_USER_READ_CONFIG()
276 	dev->block_cfg_access = 1;  in PCI_USER_READ_CONFIG()
282  * pci_cfg_access_trylock - try to lock PCI config reads/writes
295 	if (dev->block_cfg_access)  in pci_cfg_access_trylock()
298 		dev->block_cfg_access = 1;  in pci_cfg_access_trylock()
306  * pci_cfg_access_unlock - Unlock PCI config reads/writes
319 	 * to kill them, unlike a double-block above.  in pci_cfg_access_unlock()
321 	WARN_ON(!dev->block_cfg_access);  in pci_cfg_access_unlock()
323 	dev->block_cfg_access = 0;  in pci_cfg_access_unlock()
529 	return pci_bus_read_config_byte(dev->bus, dev->devfn, where, val);  in pci_read_config_byte()
539 	return pci_bus_read_config_word(dev->bus, dev->devfn, where, val);  in pci_read_config_word()
550 	return pci_bus_read_config_dword(dev->bus, dev->devfn, where, val);  in pci_read_config_dword()
558 	return pci_bus_write_config_byte(dev->bus, dev->devfn, where, val);  in pci_write_config_byte()
566 	return pci_bus_write_config_word(dev->bus, dev->devfn, where, val);  in pci_write_config_word()
575 	return pci_bus_write_config_dword(dev->bus, dev->devfn, where, val);  in pci_write_config_dword()