1 // SPDX-License-Identifier: GPL-2.0
11 #include <linux/pci-ecam.h>
15  * On 64-bit systems, we do a single ioremap for the whole config space
16  * since we have enough virtual address range available.  On 32-bit, we
23  *  - reserve mem region
24  *  - alloc struct pci_config_window with space for all mappings
25  *  - ioremap the config space
36 	if (busr->start > busr->end)  in pci_ecam_create()
37 		return ERR_PTR(-EINVAL);  in pci_ecam_create()
41 		return ERR_PTR(-ENOMEM);  in pci_ecam_create()
43 	cfg->parent = dev;  in pci_ecam_create()
44 	cfg->ops = ops;  in pci_ecam_create()
45 	cfg->busr.start = busr->start;  in pci_ecam_create()
46 	cfg->busr.end = busr->end;  in pci_ecam_create()
47 	cfg->busr.flags = IORESOURCE_BUS;  in pci_ecam_create()
48 	bus_range = resource_size(&cfg->busr);  in pci_ecam_create()
49 	bus_range_max = resource_size(cfgres) >> ops->bus_shift;  in pci_ecam_create()
52 		cfg->busr.end = busr->start + bus_range - 1;  in pci_ecam_create()
54 			 cfgres, &cfg->busr, busr);  in pci_ecam_create()
56 	bsz = 1 << ops->bus_shift;  in pci_ecam_create()
58 	cfg->res.start = cfgres->start;  in pci_ecam_create()
59 	cfg->res.end = cfgres->end;  in pci_ecam_create()
60 	cfg->res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;  in pci_ecam_create()
61 	cfg->res.name = "PCI ECAM";  in pci_ecam_create()
63 	conflict = request_resource_conflict(&iomem_resource, &cfg->res);  in pci_ecam_create()
65 		err = -EBUSY;  in pci_ecam_create()
67 			&cfg->res, conflict->name, conflict);  in pci_ecam_create()
72 		cfg->winp = kcalloc(bus_range, sizeof(*cfg->winp), GFP_KERNEL);  in pci_ecam_create()
73 		if (!cfg->winp)  in pci_ecam_create()
76 			cfg->winp[i] =  in pci_ecam_create()
77 				pci_remap_cfgspace(cfgres->start + i * bsz,  in pci_ecam_create()
79 			if (!cfg->winp[i])  in pci_ecam_create()
83 		cfg->win = pci_remap_cfgspace(cfgres->start, bus_range * bsz);  in pci_ecam_create()
84 		if (!cfg->win)  in pci_ecam_create()
88 	if (ops->init) {  in pci_ecam_create()
89 		err = ops->init(cfg);  in pci_ecam_create()
93 	dev_info(dev, "ECAM at %pR for %pR\n", &cfg->res, &cfg->busr);  in pci_ecam_create()
99 	err = -ENOMEM;  in pci_ecam_create()
111 		if (cfg->winp) {  in pci_ecam_free()
112 			for (i = 0; i < resource_size(&cfg->busr); i++)  in pci_ecam_free()
113 				if (cfg->winp[i])  in pci_ecam_free()
114 					iounmap(cfg->winp[i]);  in pci_ecam_free()
115 			kfree(cfg->winp);  in pci_ecam_free()
118 		if (cfg->win)  in pci_ecam_free()
119 			iounmap(cfg->win);  in pci_ecam_free()
121 	if (cfg->res.parent)  in pci_ecam_free()
122 		release_resource(&cfg->res);  in pci_ecam_free()
128  * Function to implement the pci_ops ->map_bus method
133 	struct pci_config_window *cfg = bus->sysdata;  in pci_ecam_map_bus()
134 	unsigned int devfn_shift = cfg->ops->bus_shift - 8;  in pci_ecam_map_bus()
135 	unsigned int busn = bus->number;  in pci_ecam_map_bus()
138 	if (busn < cfg->busr.start || busn > cfg->busr.end)  in pci_ecam_map_bus()
141 	busn -= cfg->busr.start;  in pci_ecam_map_bus()
143 		base = cfg->winp[busn];  in pci_ecam_map_bus()
145 		base = cfg->win + (busn << cfg->ops->bus_shift);  in pci_ecam_map_bus()
162 /* ECAM ops for 32-bit access only (non-compliant) */
172 /* ECAM ops for 32-bit read only (non-compliant) */