1 // SPDX-License-Identifier: GPL-2.0-only
3  * STMicroelectronics STM32MP25 PCIe endpoint driver.
18 #include "pcie-designware.h"
19 #include "pcie-stm32.h"
31 static void stm32_pcie_ep_init(struct dw_pcie_ep *ep)  in stm32_pcie_ep_init()  argument
33 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);  in stm32_pcie_ep_init()
44 	regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR,  in stm32_pcie_enable_link()
55 	regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR, STM32MP25_PCIECR_LTSSM_EN, 0);  in stm32_pcie_disable_link()
63 	dev_dbg(pci->dev, "Enable link\n");  in stm32_pcie_start_link()
67 		dev_err(pci->dev, "PCIe cannot establish link: %d\n", ret);  in stm32_pcie_start_link()
71 	enable_irq(stm32_pcie->perst_irq);  in stm32_pcie_start_link()
80 	dev_dbg(pci->dev, "Disable link\n");  in stm32_pcie_stop_link()
82 	disable_irq(stm32_pcie->perst_irq);  in stm32_pcie_stop_link()
87 static int stm32_pcie_raise_irq(struct dw_pcie_ep *ep, u8 func_no,  in stm32_pcie_raise_irq()  argument
90 	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);  in stm32_pcie_raise_irq()
94 		return dw_pcie_ep_raise_intx_irq(ep, func_no);  in stm32_pcie_raise_irq()
96 		return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);  in stm32_pcie_raise_irq()
98 		dev_err(pci->dev, "UNKNOWN IRQ type\n");  in stm32_pcie_raise_irq()
99 		return -EINVAL;  in stm32_pcie_raise_irq()
109 stm32_pcie_get_features(struct dw_pcie_ep *ep)  in stm32_pcie_get_features()  argument
129 	ret = phy_init(stm32_pcie->phy);  in stm32_pcie_enable_resources()
133 	ret = clk_prepare_enable(stm32_pcie->clk);  in stm32_pcie_enable_resources()
135 		phy_exit(stm32_pcie->phy);  in stm32_pcie_enable_resources()
142 	clk_disable_unprepare(stm32_pcie->clk);  in stm32_pcie_disable_resources()
144 	phy_exit(stm32_pcie->phy);  in stm32_pcie_disable_resources()
150 	struct dw_pcie_ep *ep = &stm32_pcie->pci.ep;  in stm32_pcie_perst_assert()  local
151 	struct device *dev = pci->dev;  in stm32_pcie_perst_assert()
155 	pci_epc_deinit_notify(ep->epc);  in stm32_pcie_perst_assert()
165 	struct device *dev = pci->dev;  in stm32_pcie_perst_deassert()
166 	struct dw_pcie_ep *ep = &pci->ep;  in stm32_pcie_perst_deassert()  local
169 	dev_dbg(dev, "PERST de-asserted by host\n");  in stm32_pcie_perst_deassert()
187 	ret = dw_pcie_ep_init_registers(ep);  in stm32_pcie_perst_deassert()
193 	pci_epc_init_notify(ep->epc);  in stm32_pcie_perst_deassert()
207 	struct dw_pcie *pci = &stm32_pcie->pci;  in stm32_pcie_ep_perst_irq_thread()
210 	perst = gpiod_get_value(stm32_pcie->perst_gpio);  in stm32_pcie_ep_perst_irq_thread()
216 	irq_set_irq_type(gpiod_to_irq(stm32_pcie->perst_gpio),  in stm32_pcie_ep_perst_irq_thread()
225 	struct dw_pcie_ep *ep = &stm32_pcie->pci.ep;  in stm32_add_pcie_ep()  local
226 	struct device *dev = &pdev->dev;  in stm32_add_pcie_ep()
229 	ret = regmap_update_bits(stm32_pcie->regmap, SYSCFG_PCIECR,  in stm32_add_pcie_ep()
235 	reset_control_assert(stm32_pcie->rst);  in stm32_add_pcie_ep()
236 	reset_control_deassert(stm32_pcie->rst);  in stm32_add_pcie_ep()
238 	ep->ops = &stm32_pcie_ep_ops;  in stm32_add_pcie_ep()
240 	ret = dw_pcie_ep_init(ep);  in stm32_add_pcie_ep()
242 		dev_err(dev, "Failed to initialize ep: %d\n", ret);  in stm32_add_pcie_ep()
249 		dw_pcie_ep_deinit(ep);  in stm32_add_pcie_ep()
259 	struct device *dev = &pdev->dev;  in stm32_pcie_probe()
264 		return -ENOMEM;  in stm32_pcie_probe()
266 	stm32_pcie->pci.dev = dev;  in stm32_pcie_probe()
267 	stm32_pcie->pci.ops = &dw_pcie_ops;  in stm32_pcie_probe()
269 	stm32_pcie->regmap = syscon_regmap_lookup_by_compatible("st,stm32mp25-syscfg");  in stm32_pcie_probe()
270 	if (IS_ERR(stm32_pcie->regmap))  in stm32_pcie_probe()
271 		return dev_err_probe(dev, PTR_ERR(stm32_pcie->regmap),  in stm32_pcie_probe()
274 	stm32_pcie->phy = devm_phy_get(dev, NULL);  in stm32_pcie_probe()
275 	if (IS_ERR(stm32_pcie->phy))  in stm32_pcie_probe()
276 		return dev_err_probe(dev, PTR_ERR(stm32_pcie->phy),  in stm32_pcie_probe()
277 				     "failed to get pcie-phy\n");  in stm32_pcie_probe()
279 	stm32_pcie->clk = devm_clk_get(dev, NULL);  in stm32_pcie_probe()
280 	if (IS_ERR(stm32_pcie->clk))  in stm32_pcie_probe()
281 		return dev_err_probe(dev, PTR_ERR(stm32_pcie->clk),  in stm32_pcie_probe()
282 				     "Failed to get PCIe clock source\n");  in stm32_pcie_probe()
284 	stm32_pcie->rst = devm_reset_control_get_exclusive(dev, NULL);  in stm32_pcie_probe()
285 	if (IS_ERR(stm32_pcie->rst))  in stm32_pcie_probe()
286 		return dev_err_probe(dev, PTR_ERR(stm32_pcie->rst),  in stm32_pcie_probe()
287 				     "Failed to get PCIe reset\n");  in stm32_pcie_probe()
289 	stm32_pcie->perst_gpio = devm_gpiod_get(dev, "reset", GPIOD_IN);  in stm32_pcie_probe()
290 	if (IS_ERR(stm32_pcie->perst_gpio))  in stm32_pcie_probe()
291 		return dev_err_probe(dev, PTR_ERR(stm32_pcie->perst_gpio),  in stm32_pcie_probe()
294 	ret = phy_set_mode(stm32_pcie->phy, PHY_MODE_PCIE);  in stm32_pcie_probe()
304 		pm_runtime_put_noidle(&pdev->dev);  in stm32_pcie_probe()
308 	stm32_pcie->perst_irq = gpiod_to_irq(stm32_pcie->perst_gpio);  in stm32_pcie_probe()
311 	irq_set_status_flags(stm32_pcie->perst_irq, IRQ_NOAUTOEN);  in stm32_pcie_probe()
313 	ret = devm_request_threaded_irq(dev, stm32_pcie->perst_irq, NULL,  in stm32_pcie_probe()
318 		pm_runtime_put_noidle(&pdev->dev);  in stm32_pcie_probe()
324 		pm_runtime_put_noidle(&pdev->dev);  in stm32_pcie_probe()
332 	struct dw_pcie *pci = &stm32_pcie->pci;  in stm32_pcie_remove()
333 	struct dw_pcie_ep *ep = &pci->ep;  in stm32_pcie_remove()  local
337 	pci_epc_deinit_notify(ep->epc);  in stm32_pcie_remove()
338 	dw_pcie_ep_deinit(ep);  in stm32_pcie_remove()
342 	pm_runtime_put_sync(&pdev->dev);  in stm32_pcie_remove()
346 	{ .compatible = "st,stm32mp25-pcie-ep" },
354 		.name = "stm32-ep-pcie",
362 MODULE_DESCRIPTION("STM32MP25 PCIe Endpoint Controller driver");