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
31 	unsigned int bus_shift = ops->bus_shift;  in pci_ecam_create()
32 	struct pci_config_window *cfg;  in pci_ecam_create()  local
37 	if (busr->start > busr->end)  in pci_ecam_create()
38 		return ERR_PTR(-EINVAL);  in pci_ecam_create()
40 	cfg = kzalloc(sizeof(*cfg), GFP_KERNEL);  in pci_ecam_create()
41 	if (!cfg)  in pci_ecam_create()
42 		return ERR_PTR(-ENOMEM);  in pci_ecam_create()
44 	/* ECAM-compliant platforms need not supply ops->bus_shift */  in pci_ecam_create()
48 	cfg->parent = dev;  in pci_ecam_create()
49 	cfg->ops = ops;  in pci_ecam_create()
50 	cfg->busr.start = busr->start;  in pci_ecam_create()
51 	cfg->busr.end = busr->end;  in pci_ecam_create()
52 	cfg->busr.flags = IORESOURCE_BUS;  in pci_ecam_create()
53 	cfg->bus_shift = bus_shift;  in pci_ecam_create()
54 	bus_range = resource_size(&cfg->busr);  in pci_ecam_create()
58 		cfg->busr.end = busr->start + bus_range - 1;  in pci_ecam_create()
60 			 cfgres, &cfg->busr, busr);  in pci_ecam_create()
64 	cfg->res.start = cfgres->start;  in pci_ecam_create()
65 	cfg->res.end = cfgres->end;  in pci_ecam_create()
66 	cfg->res.flags = IORESOURCE_MEM | IORESOURCE_BUSY;  in pci_ecam_create()
67 	cfg->res.name = "PCI ECAM";  in pci_ecam_create()
69 	conflict = request_resource_conflict(&iomem_resource, &cfg->res);  in pci_ecam_create()
71 		err = -EBUSY;  in pci_ecam_create()
73 			&cfg->res, conflict->name, conflict);  in pci_ecam_create()
78 		cfg->winp = kcalloc(bus_range, sizeof(*cfg->winp), GFP_KERNEL);  in pci_ecam_create()
79 		if (!cfg->winp)  in pci_ecam_create()
82 		cfg->win = pci_remap_cfgspace(cfgres->start, bus_range * bsz);  in pci_ecam_create()
83 		if (!cfg->win)  in pci_ecam_create()
87 	if (ops->init) {  in pci_ecam_create()
88 		err = ops->init(cfg);  in pci_ecam_create()
92 	dev_info(dev, "ECAM at %pR for %pR\n", &cfg->res, &cfg->busr);  in pci_ecam_create()
93 	return cfg;  in pci_ecam_create()
98 	err = -ENOMEM;  in pci_ecam_create()
100 	pci_ecam_free(cfg);  in pci_ecam_create()
105 void pci_ecam_free(struct pci_config_window *cfg)  in pci_ecam_free()  argument
110 		if (cfg->winp) {  in pci_ecam_free()
111 			for (i = 0; i < resource_size(&cfg->busr); i++)  in pci_ecam_free()
112 				if (cfg->winp[i])  in pci_ecam_free()
113 					iounmap(cfg->winp[i]);  in pci_ecam_free()
114 			kfree(cfg->winp);  in pci_ecam_free()
117 		if (cfg->win)  in pci_ecam_free()
118 			iounmap(cfg->win);  in pci_ecam_free()
120 	if (cfg->res.parent)  in pci_ecam_free()
121 		release_resource(&cfg->res);  in pci_ecam_free()
122 	kfree(cfg);  in pci_ecam_free()
128 	struct pci_config_window *cfg = bus->sysdata;  in pci_ecam_add_bus()  local
129 	unsigned int bsz = 1 << cfg->bus_shift;  in pci_ecam_add_bus()
130 	unsigned int busn = bus->number;  in pci_ecam_add_bus()
136 	if (busn < cfg->busr.start || busn > cfg->busr.end)  in pci_ecam_add_bus()
137 		return -EINVAL;  in pci_ecam_add_bus()
139 	busn -= cfg->busr.start;  in pci_ecam_add_bus()
140 	start = cfg->res.start + busn * bsz;  in pci_ecam_add_bus()
142 	cfg->winp[busn] = pci_remap_cfgspace(start, bsz);  in pci_ecam_add_bus()
143 	if (!cfg->winp[busn])  in pci_ecam_add_bus()
144 		return -ENOMEM;  in pci_ecam_add_bus()
151 	struct pci_config_window *cfg = bus->sysdata;  in pci_ecam_remove_bus()  local
152 	unsigned int busn = bus->number;  in pci_ecam_remove_bus()
154 	if (!per_bus_mapping || busn < cfg->busr.start || busn > cfg->busr.end)  in pci_ecam_remove_bus()
157 	busn -= cfg->busr.start;  in pci_ecam_remove_bus()
158 	if (cfg->winp[busn]) {  in pci_ecam_remove_bus()
159 		iounmap(cfg->winp[busn]);  in pci_ecam_remove_bus()
160 		cfg->winp[busn] = NULL;  in pci_ecam_remove_bus()
165  * Function to implement the pci_ops ->map_bus method
170 	struct pci_config_window *cfg = bus->sysdata;  in pci_ecam_map_bus()  local
171 	unsigned int bus_shift = cfg->ops->bus_shift;  in pci_ecam_map_bus()
172 	unsigned int devfn_shift = cfg->ops->bus_shift - 8;  in pci_ecam_map_bus()
173 	unsigned int busn = bus->number;  in pci_ecam_map_bus()
177 	if (busn < cfg->busr.start || busn > cfg->busr.end)  in pci_ecam_map_bus()
180 	busn -= cfg->busr.start;  in pci_ecam_map_bus()
182 		base = cfg->winp[busn];  in pci_ecam_map_bus()
185 		base = cfg->win;  in pci_ecam_map_bus()
187 	if (cfg->ops->bus_shift) {  in pci_ecam_map_bus()
212 /* ECAM ops for 32-bit access only (non-compliant) */
223 /* ECAM ops for 32-bit read only (non-compliant) */