1 // SPDX-License-Identifier: GPL-2.0
7  * Copyright (C) 2010-2014 ST Microelectronics
17 #include <linux/pci.h>
18 #include <linux/phy/phy.h>
22 #include "pcie-designware.h"
25 	struct dw_pcie		*pci;  member
27 	struct phy		*phy;  member
67 #define to_spear13xx_pcie(x)	dev_get_drvdata((x)->dev)
71 	struct dw_pcie *pci = spear13xx_pcie->pci;  in spear13xx_pcie_establish_link()  local
72 	struct pcie_port *pp = &pci->pp;  in spear13xx_pcie_establish_link()
73 	struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;  in spear13xx_pcie_establish_link()
75 	u32 exp_cap_off = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);  in spear13xx_pcie_establish_link()
77 	if (dw_pcie_link_up(pci)) {  in spear13xx_pcie_establish_link()
78 		dev_err(pci->dev, "link already up\n");  in spear13xx_pcie_establish_link()
89 	val = dw_pcie_readw_dbi(pci, exp_cap_off + PCI_EXP_DEVCTL);  in spear13xx_pcie_establish_link()
91 	dw_pcie_writew_dbi(pci, exp_cap_off + PCI_EXP_DEVCTL, val);  in spear13xx_pcie_establish_link()
93 	dw_pcie_writew_dbi(pci, PCI_VENDOR_ID, 0x104A);  in spear13xx_pcie_establish_link()
94 	dw_pcie_writew_dbi(pci, PCI_DEVICE_ID, 0xCD80);  in spear13xx_pcie_establish_link()
100 			&app_reg->app_ctrl_0);  in spear13xx_pcie_establish_link()
102 	return dw_pcie_wait_for_link(pci);  in spear13xx_pcie_establish_link()
108 	struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;  in spear13xx_pcie_irq_handler()
109 	struct dw_pcie *pci = spear13xx_pcie->pci;  in spear13xx_pcie_irq_handler()  local
110 	struct pcie_port *pp = &pci->pp;  in spear13xx_pcie_irq_handler()
113 	status = readl(&app_reg->int_sts);  in spear13xx_pcie_irq_handler()
120 	writel(status, &app_reg->int_clr);  in spear13xx_pcie_irq_handler()
127 	struct dw_pcie *pci = spear13xx_pcie->pci;  in spear13xx_pcie_enable_interrupts()  local
128 	struct pcie_port *pp = &pci->pp;  in spear13xx_pcie_enable_interrupts()
129 	struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;  in spear13xx_pcie_enable_interrupts()
134 		writel(readl(&app_reg->int_mask) |  in spear13xx_pcie_enable_interrupts()
135 				MSI_CTRL_INT, &app_reg->int_mask);  in spear13xx_pcie_enable_interrupts()
139 static int spear13xx_pcie_link_up(struct dw_pcie *pci)  in spear13xx_pcie_link_up()  argument
141 	struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pci);  in spear13xx_pcie_link_up()
142 	struct pcie_app_reg *app_reg = spear13xx_pcie->app_base;  in spear13xx_pcie_link_up()
144 	if (readl(&app_reg->app_status_1) & XMLH_LINK_UP)  in spear13xx_pcie_link_up()
152 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);  in spear13xx_pcie_host_init()  local
153 	struct spear13xx_pcie *spear13xx_pcie = to_spear13xx_pcie(pci);  in spear13xx_pcie_host_init()
168 	struct dw_pcie *pci = spear13xx_pcie->pci;  in spear13xx_add_pcie_port()  local
169 	struct pcie_port *pp = &pci->pp;  in spear13xx_add_pcie_port()
170 	struct device *dev = &pdev->dev;  in spear13xx_add_pcie_port()
173 	pp->irq = platform_get_irq(pdev, 0);  in spear13xx_add_pcie_port()
174 	if (pp->irq < 0)  in spear13xx_add_pcie_port()
175 		return pp->irq;  in spear13xx_add_pcie_port()
177 	ret = devm_request_irq(dev, pp->irq, spear13xx_pcie_irq_handler,  in spear13xx_add_pcie_port()
179 			       "spear1340-pcie", spear13xx_pcie);  in spear13xx_add_pcie_port()
181 		dev_err(dev, "failed to request irq %d\n", pp->irq);  in spear13xx_add_pcie_port()
185 	pp->ops = &spear13xx_pcie_host_ops;  in spear13xx_add_pcie_port()
202 	struct device *dev = &pdev->dev;  in spear13xx_pcie_probe()
203 	struct dw_pcie *pci;  in spear13xx_pcie_probe()  local
205 	struct device_node *np = dev->of_node;  in spear13xx_pcie_probe()
211 		return -ENOMEM;  in spear13xx_pcie_probe()
213 	pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);  in spear13xx_pcie_probe()
214 	if (!pci)  in spear13xx_pcie_probe()
215 		return -ENOMEM;  in spear13xx_pcie_probe()
217 	pci->dev = dev;  in spear13xx_pcie_probe()
218 	pci->ops = &dw_pcie_ops;  in spear13xx_pcie_probe()
220 	spear13xx_pcie->pci = pci;  in spear13xx_pcie_probe()
222 	spear13xx_pcie->phy = devm_phy_get(dev, "pcie-phy");  in spear13xx_pcie_probe()
223 	if (IS_ERR(spear13xx_pcie->phy)) {  in spear13xx_pcie_probe()
224 		ret = PTR_ERR(spear13xx_pcie->phy);  in spear13xx_pcie_probe()
225 		if (ret == -EPROBE_DEFER)  in spear13xx_pcie_probe()
228 			dev_err(dev, "couldn't get pcie-phy\n");  in spear13xx_pcie_probe()
232 	phy_init(spear13xx_pcie->phy);  in spear13xx_pcie_probe()
234 	spear13xx_pcie->clk = devm_clk_get(dev, NULL);  in spear13xx_pcie_probe()
235 	if (IS_ERR(spear13xx_pcie->clk)) {  in spear13xx_pcie_probe()
237 		return PTR_ERR(spear13xx_pcie->clk);  in spear13xx_pcie_probe()
239 	ret = clk_prepare_enable(spear13xx_pcie->clk);  in spear13xx_pcie_probe()
246 	pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_base);  in spear13xx_pcie_probe()
247 	if (IS_ERR(pci->dbi_base)) {  in spear13xx_pcie_probe()
248 		ret = PTR_ERR(pci->dbi_base);  in spear13xx_pcie_probe()
251 	spear13xx_pcie->app_base = pci->dbi_base + 0x2000;  in spear13xx_pcie_probe()
253 	if (of_property_read_bool(np, "st,pcie-is-gen1"))  in spear13xx_pcie_probe()
254 		pci->link_gen = 1;  in spear13xx_pcie_probe()
265 	clk_disable_unprepare(spear13xx_pcie->clk);  in spear13xx_pcie_probe()
271 	{ .compatible = "st,spear1340-pcie", },
278 		.name	= "spear-pcie",