1 // SPDX-License-Identifier: GPL-2.0
12 #include <linux/pci-acpi.h>
13 #include <linux/pci-ecam.h>
52 	const struct loongson_pci_data *data;  member
58 	dev->class = PCI_CLASS_BRIDGE_PCI_NORMAL;  in bridge_class_quirk()
73 	pdev->mmio_always_on = 1;  in system_bus_quirk()
74 	pdev->non_compliant_bars = 1;  in system_bus_quirk()
93 	struct pci_bus *bus = pdev->bus;  in loongson_set_min_mrrs_quirk()  local
108 	while (!pci_is_root_bus(bus)) {  in loongson_set_min_mrrs_quirk()
109 		bridge = bus->self;  in loongson_set_min_mrrs_quirk()
110 		bus = bus->parent;  in loongson_set_min_mrrs_quirk()
126 	struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);  in loongson_mrrs_quirk()
128 	bridge->no_inc_mrrs = 1;  in loongson_mrrs_quirk()
149 	pdev->pin = 1 + (PCI_FUNC(pdev->devfn) & 3);  in loongson_pci_pin_quirk()
168 	u16 val, class = dev->class >> 8;  in loongson_pci_msi_quirk()
173 	pci_read_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, &val);  in loongson_pci_msi_quirk()
175 	pci_write_config_word(dev, dev->msi_cap + PCI_MSI_FLAGS, val);  in loongson_pci_msi_quirk()
179 static struct loongson_pci *pci_bus_to_loongson_pci(struct pci_bus *bus)  in pci_bus_to_loongson_pci()  argument
184 		return (struct loongson_pci *)(bus->sysdata);  in pci_bus_to_loongson_pci()
186 	cfg = bus->sysdata;  in pci_bus_to_loongson_pci()
187 	return (struct loongson_pci *)(cfg->priv);  in pci_bus_to_loongson_pci()
190 static void __iomem *cfg0_map(struct loongson_pci *priv, struct pci_bus *bus,  in cfg0_map()  argument
194 	unsigned char busnum = bus->number;  in cfg0_map()
196 	if (!pci_is_root_bus(bus)) {  in cfg0_map()
201 	return priv->cfg0_base + addroff;  in cfg0_map()
204 static void __iomem *cfg1_map(struct loongson_pci *priv, struct pci_bus *bus,  in cfg1_map()  argument
208 	unsigned char busnum = bus->number;  in cfg1_map()
210 	if (!pci_is_root_bus(bus)) {  in cfg1_map()
215 	return priv->cfg1_base + addroff;  in cfg1_map()
218 static bool pdev_may_exist(struct pci_bus *bus, unsigned int device,  in pdev_may_exist()  argument
221 	return !(pci_is_root_bus(bus) &&  in pdev_may_exist()
225 static void __iomem *pci_loongson_map_bus(struct pci_bus *bus,  in pci_loongson_map_bus()  argument
230 	struct loongson_pci *priv = pci_bus_to_loongson_pci(bus);  in pci_loongson_map_bus()
233 	 * Do not read more than one device on the bus other than  in pci_loongson_map_bus()
234 	 * the host bus.  in pci_loongson_map_bus()
236 	if ((priv->data->flags & FLAG_DEV_FIX) && bus->self) {  in pci_loongson_map_bus()
237 		if (!pci_is_root_bus(bus) && (device > 0))  in pci_loongson_map_bus()
241 	/* Don't access non-existent devices */  in pci_loongson_map_bus()
242 	if (priv->data->flags & FLAG_DEV_HIDDEN) {  in pci_loongson_map_bus()
243 		if (!pdev_may_exist(bus, device, function))  in pci_loongson_map_bus()
248 	if (where < PCI_CFG_SPACE_SIZE && priv->cfg0_base)  in pci_loongson_map_bus()
249 		return cfg0_map(priv, bus, devfn, where);  in pci_loongson_map_bus()
252 	if (where < PCI_CFG_SPACE_EXP_SIZE && priv->cfg1_base)  in pci_loongson_map_bus()
253 		return cfg1_map(priv, bus, devfn, where);  in pci_loongson_map_bus()
278 /* LS2K/LS7A accept 8/16/32-bit PCI config operations */
285 /* RS780/SR5690 only accept 32-bit PCI config operations */
308 	{ .compatible = "loongson,ls2k-pci",
309 		.data = &ls2k_pci_data, },
310 	{ .compatible = "loongson,ls7a-pci",
311 		.data = &ls7a_pci_data, },
312 	{ .compatible = "loongson,rs780e-pci",
313 		.data = &rs780e_pci_data, },
320 	struct device *dev = &pdev->dev;  in loongson_pci_probe()
321 	struct device_node *node = dev->of_node;  in loongson_pci_probe()
326 		return -ENODEV;  in loongson_pci_probe()
330 		return -ENODEV;  in loongson_pci_probe()
333 	priv->pdev = pdev;  in loongson_pci_probe()
334 	priv->data = of_device_get_match_data(dev);  in loongson_pci_probe()
336 	if (priv->data->flags & FLAG_CFG0) {  in loongson_pci_probe()
341 			priv->cfg0_base = devm_pci_remap_cfg_resource(dev, regs);  in loongson_pci_probe()
342 			if (IS_ERR(priv->cfg0_base))  in loongson_pci_probe()
343 				return PTR_ERR(priv->cfg0_base);  in loongson_pci_probe()
347 	if (priv->data->flags & FLAG_CFG1) {  in loongson_pci_probe()
352 			priv->cfg1_base = devm_pci_remap_cfg_resource(dev, regs);  in loongson_pci_probe()
353 			if (IS_ERR(priv->cfg1_base))  in loongson_pci_probe()
354 				priv->cfg1_base = NULL;  in loongson_pci_probe()
358 	bridge->sysdata = priv;  in loongson_pci_probe()
359 	bridge->ops = priv->data->ops;  in loongson_pci_probe()
360 	bridge->map_irq = loongson_map_irq;  in loongson_pci_probe()
367 		.name = "loongson-pci",
380 	struct device *dev = cfg->parent;  in loongson_pci_ecam_init()
382 	struct loongson_pci_data *data;  in loongson_pci_ecam_init()  local
386 		return -ENOMEM;  in loongson_pci_ecam_init()
388 	data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);  in loongson_pci_ecam_init()
389 	if (!data)  in loongson_pci_ecam_init()
390 		return -ENOMEM;  in loongson_pci_ecam_init()
392 	cfg->priv = priv;  in loongson_pci_ecam_init()
393 	data->flags = FLAG_CFG1 | FLAG_DEV_HIDDEN;  in loongson_pci_ecam_init()
394 	priv->data = data;  in loongson_pci_ecam_init()
395 	priv->cfg1_base = cfg->win - (cfg->busr.start << 16);  in loongson_pci_ecam_init()