1 // SPDX-License-Identifier: GPL-2.0
3  * Support for Faraday Technology FTPC100 PCI Controller
7  * Based on the out-of-tree OpenWRT patch for Cortina Gemini:
10  * Based on SL2312 PCI controller code
22 #include <linux/pci.h>
31 #include "../pci.h"
39 #define FTPCI_CTRL	0x08 /* PCI control signal */
41 #define FTPCI_CONFIG	0x28 /* PCI configuration command register */
80  * Bit 31..20 defines the PCI side memory base
106 /* Defines for PCI configuration command register */
114  * struct faraday_pci_variant - encodes IP block differences
173 		return -EINVAL;  in faraday_res_to_memcfg()
179 		pr_warn("truncated PCI memory base\n");  in faraday_res_to_memcfg()
182 	pr_debug("Translated pci base @%pap, size %pap to config %08x\n",  in faraday_res_to_memcfg()
198 			p->base + FTPCI_CONFIG);  in faraday_raw_pci_read_config()
200 	*value = readl(p->base + FTPCI_DATA);  in faraday_raw_pci_read_config()
213 	struct faraday_pci *p = bus->sysdata;  in faraday_pci_read_config()
215 	dev_dbg(&bus->dev,  in faraday_pci_read_config()
216 		"[read]  slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n",  in faraday_pci_read_config()
219 	return faraday_raw_pci_read_config(p, bus->number, fn, config, size, value);  in faraday_pci_read_config()
233 			p->base + FTPCI_CONFIG);  in faraday_raw_pci_write_config()
237 		writel(value, p->base + FTPCI_DATA);  in faraday_raw_pci_write_config()
240 		writew(value, p->base + FTPCI_DATA + (config & 3));  in faraday_raw_pci_write_config()
243 		writeb(value, p->base + FTPCI_DATA + (config & 3));  in faraday_raw_pci_write_config()
255 	struct faraday_pci *p = bus->sysdata;  in faraday_pci_write_config()
257 	dev_dbg(&bus->dev,  in faraday_pci_write_config()
258 		"[write] slt: %.2d, fnc: %d, cnf: 0x%.2X, val (%d bytes): 0x%.8X\n",  in faraday_pci_write_config()
261 	return faraday_raw_pci_write_config(p, bus->number, fn, config, size,  in faraday_pci_write_config()
317 		generic_handle_irq(irq_find_mapping(p->irqdomain, i));  in faraday_pci_irq_handler()
324 	.name = "PCI",
334 	irq_set_chip_data(irq, domain->host_data);  in faraday_pci_irq_map()
345 	struct device_node *intc = of_get_next_child(p->dev->of_node, NULL);  in faraday_pci_setup_cascaded_irq()
350 		dev_err(p->dev, "missing child interrupt-controller node\n");  in faraday_pci_setup_cascaded_irq()
351 		return -EINVAL;  in faraday_pci_setup_cascaded_irq()
354 	/* All PCI IRQs cascade off this one */  in faraday_pci_setup_cascaded_irq()
357 		dev_err(p->dev, "failed to get parent IRQ\n");  in faraday_pci_setup_cascaded_irq()
359 		return irq ?: -EINVAL;  in faraday_pci_setup_cascaded_irq()
362 	p->irqdomain = irq_domain_add_linear(intc, PCI_NUM_INTX,  in faraday_pci_setup_cascaded_irq()
365 	if (!p->irqdomain) {  in faraday_pci_setup_cascaded_irq()
366 		dev_err(p->dev, "failed to create Gemini PCI IRQ domain\n");  in faraday_pci_setup_cascaded_irq()
367 		return -EINVAL;  in faraday_pci_setup_cascaded_irq()
373 		irq_create_mapping(p->irqdomain, i);  in faraday_pci_setup_cascaded_irq()
380 	struct device *dev = p->dev;  in faraday_pci_parse_map_dma_ranges()
391 	resource_list_for_each_entry(entry, &bridge->dma_ranges) {  in faraday_pci_parse_map_dma_ranges()
392 		u64 pci_addr = entry->res->start - entry->offset;  in faraday_pci_parse_map_dma_ranges()
393 		u64 end = entry->res->end - entry->offset;  in faraday_pci_parse_map_dma_ranges()
397 					    resource_size(entry->res), &val);  in faraday_pci_parse_map_dma_ranges()
401 			return -EINVAL;  in faraday_pci_parse_map_dma_ranges()
404 		dev_info(dev, "DMA MEM%d BASE: 0x%016llx -> 0x%016llx config %08x\n",  in faraday_pci_parse_map_dma_ranges()
410 			dev_err(dev, "ignore extraneous dma-range %d\n", i);  in faraday_pci_parse_map_dma_ranges()
422 	struct device *dev = &pdev->dev;  in faraday_pci_probe()
437 		return -ENOMEM;  in faraday_pci_probe()
439 	host->ops = &faraday_pci_ops;  in faraday_pci_probe()
441 	host->sysdata = p;  in faraday_pci_probe()
442 	p->dev = dev;  in faraday_pci_probe()
448 	p->bus_clk = devm_clk_get_enabled(dev, "PCICLK");  in faraday_pci_probe()
449 	if (IS_ERR(p->bus_clk))  in faraday_pci_probe()
450 		return PTR_ERR(p->bus_clk);  in faraday_pci_probe()
452 	p->base = devm_platform_ioremap_resource(pdev, 0);  in faraday_pci_probe()
453 	if (IS_ERR(p->base))  in faraday_pci_probe()
454 		return PTR_ERR(p->base);  in faraday_pci_probe()
456 	win = resource_list_first_type(&host->windows, IORESOURCE_IO);  in faraday_pci_probe()
458 		io = win->res;  in faraday_pci_probe()
459 		if (!faraday_res_to_memcfg(io->start - win->offset,  in faraday_pci_probe()
462 			writel(val, p->base + FTPCI_IOSIZE);  in faraday_pci_probe()
465 			return -EINVAL;  in faraday_pci_probe()
470 	val = readl(p->base + FTPCI_CTRL);  in faraday_pci_probe()
474 	writel(val, p->base + FTPCI_CTRL);  in faraday_pci_probe()
477 	if (variant->cascaded_irq) {  in faraday_pci_probe()
486 	if (!IS_ERR(p->bus_clk)) {  in faraday_pci_probe()
492 		rate = clk_get_rate(p->bus_clk);  in faraday_pci_probe()
497 			ret = clk_set_rate(p->bus_clk, 66000000);  in faraday_pci_probe()
506 		rate = clk_get_rate(p->bus_clk);  in faraday_pci_probe()
522 	p->bus = host->bus;  in faraday_pci_probe()
523 	p->bus->max_bus_speed = max_bus_speed;  in faraday_pci_probe()
524 	p->bus->cur_bus_speed = cur_bus_speed;  in faraday_pci_probe()
526 	pci_bus_assign_resources(p->bus);  in faraday_pci_probe()
527 	pci_bus_add_devices(p->bus);  in faraday_pci_probe()
550 		.compatible = "faraday,ftpci100-dual",