8  * PCI bridge when the HW doesn't provide such a root port PCI
9  * bridge.
11  * It emulates a PCI bridge by providing a fake PCI configuration
21 #include "pci-bridge-emul.h"
72 	 * bridge that is not capable of a burst transfer of more than
78 	 * BIST register: implemented as read-only, as "A bridge that
148 	 * are RO, and bridge control (31:16) are a mix of RW, RO,
258  * bridge configuration space. The caller needs to have initialized
263 int pci_bridge_emul_init(struct pci_bridge_emul *bridge,  in pci_bridge_emul_init()  argument
266 	BUILD_BUG_ON(sizeof(bridge->conf) != PCI_BRIDGE_CONF_END);  in pci_bridge_emul_init()
268 	bridge->conf.class_revision |= cpu_to_le32(PCI_CLASS_BRIDGE_PCI << 16);  in pci_bridge_emul_init()
269 	bridge->conf.header_type = PCI_HEADER_TYPE_BRIDGE;  in pci_bridge_emul_init()
270 	bridge->conf.cache_line_size = 0x10;  in pci_bridge_emul_init()
271 	bridge->conf.status = cpu_to_le16(PCI_STATUS_CAP_LIST);  in pci_bridge_emul_init()
272 	bridge->pci_regs_behavior = kmemdup(pci_regs_behavior,  in pci_bridge_emul_init()
275 	if (!bridge->pci_regs_behavior)  in pci_bridge_emul_init()
278 	if (bridge->has_pcie) {  in pci_bridge_emul_init()
279 		bridge->conf.capabilities_pointer = PCI_CAP_PCIE_START;  in pci_bridge_emul_init()
280 		bridge->pcie_conf.cap_id = PCI_CAP_ID_EXP;  in pci_bridge_emul_init()
282 		bridge->pcie_conf.cap =  in pci_bridge_emul_init()
285 		bridge->pcie_cap_regs_behavior =  in pci_bridge_emul_init()
289 		if (!bridge->pcie_cap_regs_behavior) {  in pci_bridge_emul_init()
290 			kfree(bridge->pci_regs_behavior);  in pci_bridge_emul_init()
296 		bridge->pci_regs_behavior[PCI_PREF_MEMORY_BASE / 4].ro = ~0;  in pci_bridge_emul_init()
297 		bridge->pci_regs_behavior[PCI_PREF_MEMORY_BASE / 4].rw = 0;  in pci_bridge_emul_init()
308 void pci_bridge_emul_cleanup(struct pci_bridge_emul *bridge)  in pci_bridge_emul_cleanup()  argument
310 	if (bridge->has_pcie)  in pci_bridge_emul_cleanup()
311 		kfree(bridge->pcie_cap_regs_behavior);  in pci_bridge_emul_cleanup()
312 	kfree(bridge->pci_regs_behavior);  in pci_bridge_emul_cleanup()
318  * configuration space of the fake bridge. It will call back the
321 int pci_bridge_emul_conf_read(struct pci_bridge_emul *bridge, int where,  in pci_bridge_emul_conf_read()  argument
326 	pci_bridge_emul_read_status_t (*read_op)(struct pci_bridge_emul *bridge,  in pci_bridge_emul_conf_read()
331 	if (bridge->has_pcie && reg >= PCI_CAP_PCIE_END) {  in pci_bridge_emul_conf_read()
336 	if (!bridge->has_pcie && reg >= PCI_BRIDGE_CONF_END) {  in pci_bridge_emul_conf_read()
341 	if (bridge->has_pcie && reg >= PCI_CAP_PCIE_START) {  in pci_bridge_emul_conf_read()
343 		read_op = bridge->ops->read_pcie;  in pci_bridge_emul_conf_read()
344 		cfgspace = (__le32 *) &bridge->pcie_conf;  in pci_bridge_emul_conf_read()
345 		behavior = bridge->pcie_cap_regs_behavior;  in pci_bridge_emul_conf_read()
347 		read_op = bridge->ops->read_base;  in pci_bridge_emul_conf_read()
348 		cfgspace = (__le32 *) &bridge->conf;  in pci_bridge_emul_conf_read()
349 		behavior = bridge->pci_regs_behavior;  in pci_bridge_emul_conf_read()
353 		ret = read_op(bridge, reg, value);  in pci_bridge_emul_conf_read()
380  * configuration space of the fake bridge. It will call back the
383 int pci_bridge_emul_conf_write(struct pci_bridge_emul *bridge, int where,  in pci_bridge_emul_conf_write()  argument
388 	void (*write_op)(struct pci_bridge_emul *bridge, int reg,  in pci_bridge_emul_conf_write()
393 	if (bridge->has_pcie && reg >= PCI_CAP_PCIE_END)  in pci_bridge_emul_conf_write()
396 	if (!bridge->has_pcie && reg >= PCI_BRIDGE_CONF_END)  in pci_bridge_emul_conf_write()
410 	ret = pci_bridge_emul_conf_read(bridge, reg, 4, &old);  in pci_bridge_emul_conf_write()
414 	if (bridge->has_pcie && reg >= PCI_CAP_PCIE_START) {  in pci_bridge_emul_conf_write()
416 		write_op = bridge->ops->write_pcie;  in pci_bridge_emul_conf_write()
417 		cfgspace = (__le32 *) &bridge->pcie_conf;  in pci_bridge_emul_conf_write()
418 		behavior = bridge->pcie_cap_regs_behavior;  in pci_bridge_emul_conf_write()
420 		write_op = bridge->ops->write_base;  in pci_bridge_emul_conf_write()
421 		cfgspace = (__le32 *) &bridge->conf;  in pci_bridge_emul_conf_write()
422 		behavior = bridge->pci_regs_behavior;  in pci_bridge_emul_conf_write()
437 		write_op(bridge, reg, old, new, mask);  in pci_bridge_emul_conf_write()