1 // SPDX-License-Identifier: GPL-2.0-only
19 #include "pcie-designware.h"
20 #include "pcie-stm32.h"
35 	if (stm32_pcie->perst_gpio) {  in stm32_pcie_deassert_perst()
37 		gpiod_set_value(stm32_pcie->perst_gpio, 0);  in stm32_pcie_deassert_perst()
45 	gpiod_set_value(stm32_pcie->perst_gpio, 1);  in stm32_pcie_assert_perst()
52 	return regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR,  in stm32_pcie_start_link()
61 	regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR,  in stm32_pcie_stop_link()
70 	ret = dw_pcie_suspend_noirq(&stm32_pcie->pci);  in stm32_pcie_suspend_noirq()
76 	clk_disable_unprepare(stm32_pcie->clk);  in stm32_pcie_suspend_noirq()
79 		phy_exit(stm32_pcie->phy);  in stm32_pcie_suspend_noirq()
101 		ret = phy_init(stm32_pcie->phy);  in stm32_pcie_resume_noirq()
108 	ret = clk_prepare_enable(stm32_pcie->clk);  in stm32_pcie_resume_noirq()
114 	ret = dw_pcie_resume_noirq(&stm32_pcie->pci);  in stm32_pcie_resume_noirq()
124 	clk_disable_unprepare(stm32_pcie->clk);  in stm32_pcie_resume_noirq()
127 	phy_exit(stm32_pcie->phy);  in stm32_pcie_resume_noirq()
148 	struct device *dev = stm32_pcie->pci.dev;  in stm32_add_pcie_port()
152 	ret = phy_set_mode(stm32_pcie->phy, PHY_MODE_PCIE);  in stm32_add_pcie_port()
156 	ret = phy_init(stm32_pcie->phy);  in stm32_add_pcie_port()
160 	ret = regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR,  in stm32_add_pcie_port()
168 	if (stm32_pcie->wake_gpio) {  in stm32_add_pcie_port()
169 		wake_irq = gpiod_to_irq(stm32_pcie->wake_gpio);  in stm32_add_pcie_port()
172 			dev_err(dev, "Failed to enable wakeup irq %d\n", ret);  in stm32_add_pcie_port()
184 	phy_exit(stm32_pcie->phy);  in stm32_add_pcie_port()
191 	dev_pm_clear_wake_irq(stm32_pcie->pci.dev);  in stm32_remove_pcie_port()
195 	phy_exit(stm32_pcie->phy);  in stm32_remove_pcie_port()
200 	struct device *dev = stm32_pcie->pci.dev;  in stm32_pcie_parse_port()
203 	root_port = of_get_next_available_child(dev->of_node, NULL);  in stm32_pcie_parse_port()
205 	stm32_pcie->phy = devm_of_phy_get(dev, root_port, NULL);  in stm32_pcie_parse_port()
206 	if (IS_ERR(stm32_pcie->phy)) {  in stm32_pcie_parse_port()
208 		return dev_err_probe(dev, PTR_ERR(stm32_pcie->phy),  in stm32_pcie_parse_port()
209 				     "Failed to get pcie-phy\n");  in stm32_pcie_parse_port()
212 	stm32_pcie->perst_gpio = devm_fwnode_gpiod_get(dev, of_fwnode_handle(root_port),  in stm32_pcie_parse_port()
214 	if (IS_ERR(stm32_pcie->perst_gpio)) {  in stm32_pcie_parse_port()
215 		if (PTR_ERR(stm32_pcie->perst_gpio) != -ENOENT) {  in stm32_pcie_parse_port()
217 			return dev_err_probe(dev, PTR_ERR(stm32_pcie->perst_gpio),  in stm32_pcie_parse_port()
220 		stm32_pcie->perst_gpio = NULL;  in stm32_pcie_parse_port()
223 	stm32_pcie->wake_gpio = devm_fwnode_gpiod_get(dev, of_fwnode_handle(root_port),  in stm32_pcie_parse_port()
226 	if (IS_ERR(stm32_pcie->wake_gpio)) {  in stm32_pcie_parse_port()
227 		if (PTR_ERR(stm32_pcie->wake_gpio) != -ENOENT) {  in stm32_pcie_parse_port()
229 			return dev_err_probe(dev, PTR_ERR(stm32_pcie->wake_gpio),  in stm32_pcie_parse_port()
232 		stm32_pcie->wake_gpio = NULL;  in stm32_pcie_parse_port()
243 	struct device *dev = &pdev->dev;  in stm32_pcie_probe()
248 		return -ENOMEM;  in stm32_pcie_probe()
250 	stm32_pcie->pci.dev = dev;  in stm32_pcie_probe()
251 	stm32_pcie->pci.ops = &dw_pcie_ops;  in stm32_pcie_probe()
252 	stm32_pcie->pci.pp.ops = &stm32_pcie_host_ops;  in stm32_pcie_probe()
254 	stm32_pcie->regmap = syscon_regmap_lookup_by_compatible("st,stm32mp25-syscfg");  in stm32_pcie_probe()
255 	if (IS_ERR(stm32_pcie->regmap))  in stm32_pcie_probe()
256 		return dev_err_probe(dev, PTR_ERR(stm32_pcie->regmap),  in stm32_pcie_probe()
257 				     "No syscfg specified\n");  in stm32_pcie_probe()
259 	stm32_pcie->clk = devm_clk_get(dev, NULL);  in stm32_pcie_probe()
260 	if (IS_ERR(stm32_pcie->clk))  in stm32_pcie_probe()
261 		return dev_err_probe(dev, PTR_ERR(stm32_pcie->clk),  in stm32_pcie_probe()
264 	stm32_pcie->rst = devm_reset_control_get_exclusive(dev, NULL);  in stm32_pcie_probe()
265 	if (IS_ERR(stm32_pcie->rst))  in stm32_pcie_probe()
266 		return dev_err_probe(dev, PTR_ERR(stm32_pcie->rst),  in stm32_pcie_probe()
279 	reset_control_assert(stm32_pcie->rst);  in stm32_pcie_probe()
280 	reset_control_deassert(stm32_pcie->rst);  in stm32_pcie_probe()
282 	ret = clk_prepare_enable(stm32_pcie->clk);  in stm32_pcie_probe()
302 	ret = dw_pcie_host_init(&stm32_pcie->pci.pp);  in stm32_pcie_probe()
306 	if (stm32_pcie->wake_gpio)  in stm32_pcie_probe()
312 	clk_disable_unprepare(stm32_pcie->clk);  in stm32_pcie_probe()
323 	struct dw_pcie_rp *pp = &stm32_pcie->pci.pp;  in stm32_pcie_remove()
325 	if (stm32_pcie->wake_gpio)  in stm32_pcie_remove()
326 		device_init_wakeup(&pdev->dev, false);  in stm32_pcie_remove()
330 	clk_disable_unprepare(stm32_pcie->clk);  in stm32_pcie_remove()
334 	pm_runtime_put_noidle(&pdev->dev);  in stm32_pcie_remove()
338 	{ .compatible = "st,stm32mp25-pcie-rc" },
346 		.name = "stm32-pcie",