1 // SPDX-License-Identifier: GPL-2.0
3  * Loongson PCI Host Controller Driver
12 #include <linux/pci-acpi.h>
13 #include <linux/pci-ecam.h>
32 #define FLAG_CFG1	BIT(1)
50 	dev->class = PCI_CLASS_BRIDGE_PCI << 8;  in bridge_class_quirk()
65 	pdev->mmio_always_on = 1;  in system_bus_quirk()
66 	pdev->non_compliant_bars = 1;  in system_bus_quirk()
76  * Some Loongson PCIe ports have hardware limitations on their Maximum Read
79  * bridges. However, some MIPS Loongson firmware doesn't set MRRS properly,
85 	struct pci_bus *bus = pdev->bus;  in loongson_set_min_mrrs_quirk()
88 		{ PCI_VDEVICE(LOONGSON, DEV_LS2K_PCIE_PORT0) },  in loongson_set_min_mrrs_quirk()
89 		{ PCI_VDEVICE(LOONGSON, DEV_LS7A_PCIE_PORT0) },  in loongson_set_min_mrrs_quirk()
90 		{ PCI_VDEVICE(LOONGSON, DEV_LS7A_PCIE_PORT1) },  in loongson_set_min_mrrs_quirk()
91 		{ PCI_VDEVICE(LOONGSON, DEV_LS7A_PCIE_PORT2) },  in loongson_set_min_mrrs_quirk()
92 		{ PCI_VDEVICE(LOONGSON, DEV_LS7A_PCIE_PORT3) },  in loongson_set_min_mrrs_quirk()
93 		{ PCI_VDEVICE(LOONGSON, DEV_LS7A_PCIE_PORT4) },  in loongson_set_min_mrrs_quirk()
94 		{ PCI_VDEVICE(LOONGSON, DEV_LS7A_PCIE_PORT5) },  in loongson_set_min_mrrs_quirk()
95 		{ PCI_VDEVICE(LOONGSON, DEV_LS7A_PCIE_PORT6) },  in loongson_set_min_mrrs_quirk()
101 		bridge = bus->self;  in loongson_set_min_mrrs_quirk()
102 		bus = bus->parent;  in loongson_set_min_mrrs_quirk()
118 	struct pci_host_bridge *bridge = pci_find_host_bridge(pdev->bus);  in loongson_mrrs_quirk()
120 	bridge->no_inc_mrrs = 1;  in loongson_mrrs_quirk()
141 	pdev->pin = 1 + (PCI_FUNC(pdev->devfn) & 3);  in loongson_pci_pin_quirk()
167 		return (struct loongson_pci *)(bus->sysdata);  in pci_bus_to_loongson_pci()
169 	cfg = bus->sysdata;  in pci_bus_to_loongson_pci()
170 	return (struct loongson_pci *)(cfg->priv);  in pci_bus_to_loongson_pci()
177 	unsigned char busnum = bus->number;  in cfg0_map()
180 		addroff |= BIT(24); /* Type 1 Access */  in cfg0_map()
184 	return priv->cfg0_base + addroff;  in cfg0_map()
191 	unsigned char busnum = bus->number;  in cfg1_map()
194 		addroff |= BIT(28); /* Type 1 Access */  in cfg1_map()
198 	return priv->cfg1_base + addroff;  in cfg1_map()
212 	if ((priv->data->flags & FLAG_DEV_FIX) && bus->self) {  in pci_loongson_map_bus()
222 	if (where < PCI_CFG_SPACE_SIZE && priv->cfg0_base)  in pci_loongson_map_bus()
226 	if (where < PCI_CFG_SPACE_EXP_SIZE && priv->cfg1_base)  in pci_loongson_map_bus()
252 /* LS2K/LS7A accept 8/16/32-bit PCI config operations */
259 /* RS780/SR5690 only accept 32-bit PCI config operations */
282 	{ .compatible = "loongson,ls2k-pci",
284 	{ .compatible = "loongson,ls7a-pci",
286 	{ .compatible = "loongson,rs780e-pci",
294 	struct device *dev = &pdev->dev;  in loongson_pci_probe()
295 	struct device_node *node = dev->of_node;  in loongson_pci_probe()
300 		return -ENODEV;  in loongson_pci_probe()
304 		return -ENODEV;  in loongson_pci_probe()
307 	priv->pdev = pdev;  in loongson_pci_probe()
308 	priv->data = (struct pci_controller_data *)of_device_get_match_data(dev);  in loongson_pci_probe()
310 	if (priv->data->flags & FLAG_CFG0) {  in loongson_pci_probe()
315 			priv->cfg0_base = devm_pci_remap_cfg_resource(dev, regs);  in loongson_pci_probe()
316 			if (IS_ERR(priv->cfg0_base))  in loongson_pci_probe()
317 				return PTR_ERR(priv->cfg0_base);  in loongson_pci_probe()
321 	if (priv->data->flags & FLAG_CFG1) {  in loongson_pci_probe()
322 		regs = platform_get_resource(pdev, IORESOURCE_MEM, 1);  in loongson_pci_probe()
326 			priv->cfg1_base = devm_pci_remap_cfg_resource(dev, regs);  in loongson_pci_probe()
327 			if (IS_ERR(priv->cfg1_base))  in loongson_pci_probe()
328 				priv->cfg1_base = NULL;  in loongson_pci_probe()
332 	bridge->sysdata = priv;  in loongson_pci_probe()
333 	bridge->ops = priv->data->ops;  in loongson_pci_probe()
334 	bridge->map_irq = loongson_map_irq;  in loongson_pci_probe()
341 		.name = "loongson-pci",
354 	struct device *dev = cfg->parent;  in loongson_pci_ecam_init()
360 		return -ENOMEM;  in loongson_pci_ecam_init()
364 		return -ENOMEM;  in loongson_pci_ecam_init()
366 	cfg->priv = priv;  in loongson_pci_ecam_init()
367 	data->flags = FLAG_CFG1;  in loongson_pci_ecam_init()
368 	priv->data = data;  in loongson_pci_ecam_init()
369 	priv->cfg1_base = cfg->win - (cfg->busr.start << 16);  in loongson_pci_ecam_init()