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  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * PCIe controller EP driver for Freescale Layerscape SoCs
  4 *
  5 * Copyright (C) 2018 NXP Semiconductor.
  6 *
  7 * Author: Xiaowei Bao <xiaowei.bao@nxp.com>
  8 */
  9
 10#include <linux/kernel.h>
 11#include <linux/init.h>
 12#include <linux/of_pci.h>
 13#include <linux/of_platform.h>
 14#include <linux/of_address.h>
 15#include <linux/pci.h>
 16#include <linux/platform_device.h>
 17#include <linux/resource.h>
 18
 19#include "pcie-designware.h"
 20
 21#define to_ls_pcie_ep(x)	dev_get_drvdata((x)->dev)
 22
 23struct ls_pcie_ep_drvdata {
 24	u32				func_offset;
 25	const struct dw_pcie_ep_ops	*ops;
 26	const struct dw_pcie_ops	*dw_pcie_ops;
 27};
 28
 29struct ls_pcie_ep {
 30	struct dw_pcie			*pci;
 31	struct pci_epc_features		*ls_epc;
 32	const struct ls_pcie_ep_drvdata *drvdata;
 33};
 34
 35static int ls_pcie_establish_link(struct dw_pcie *pci)
 36{
 37	return 0;
 38}
 39
 40static const struct dw_pcie_ops dw_ls_pcie_ep_ops = {
 41	.start_link = ls_pcie_establish_link,
 42};
 43
 44static const struct pci_epc_features*
 45ls_pcie_ep_get_features(struct dw_pcie_ep *ep)
 46{
 47	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 48	struct ls_pcie_ep *pcie = to_ls_pcie_ep(pci);
 49
 50	return pcie->ls_epc;
 51}
 52
 53static void ls_pcie_ep_init(struct dw_pcie_ep *ep)
 54{
 55	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 56	struct ls_pcie_ep *pcie = to_ls_pcie_ep(pci);
 57	struct dw_pcie_ep_func *ep_func;
 58	enum pci_barno bar;
 59
 60	ep_func = dw_pcie_ep_get_func_from_ep(ep, 0);
 61	if (!ep_func)
 62		return;
 63
 64	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++)
 65		dw_pcie_ep_reset_bar(pci, bar);
 66
 67	pcie->ls_epc->msi_capable = ep_func->msi_cap ? true : false;
 68	pcie->ls_epc->msix_capable = ep_func->msix_cap ? true : false;
 69}
 70
 71static int ls_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 72				enum pci_epc_irq_type type, u16 interrupt_num)
 73{
 74	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 75
 76	switch (type) {
 77	case PCI_EPC_IRQ_LEGACY:
 78		return dw_pcie_ep_raise_legacy_irq(ep, func_no);
 79	case PCI_EPC_IRQ_MSI:
 80		return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
 81	case PCI_EPC_IRQ_MSIX:
 82		return dw_pcie_ep_raise_msix_irq_doorbell(ep, func_no,
 83							  interrupt_num);
 84	default:
 85		dev_err(pci->dev, "UNKNOWN IRQ type\n");
 86		return -EINVAL;
 87	}
 88}
 89
 90static unsigned int ls_pcie_ep_func_conf_select(struct dw_pcie_ep *ep,
 91						u8 func_no)
 92{
 93	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 94	struct ls_pcie_ep *pcie = to_ls_pcie_ep(pci);
 95
 96	WARN_ON(func_no && !pcie->drvdata->func_offset);
 97	return pcie->drvdata->func_offset * func_no;
 98}
 99
100static const struct dw_pcie_ep_ops ls_pcie_ep_ops = {
101	.ep_init = ls_pcie_ep_init,
102	.raise_irq = ls_pcie_ep_raise_irq,
103	.get_features = ls_pcie_ep_get_features,
104	.func_conf_select = ls_pcie_ep_func_conf_select,
105};
106
107static const struct ls_pcie_ep_drvdata ls1_ep_drvdata = {
108	.ops = &ls_pcie_ep_ops,
109	.dw_pcie_ops = &dw_ls_pcie_ep_ops,
110};
111
112static const struct ls_pcie_ep_drvdata ls2_ep_drvdata = {
113	.func_offset = 0x20000,
114	.ops = &ls_pcie_ep_ops,
115	.dw_pcie_ops = &dw_ls_pcie_ep_ops,
116};
117
118static const struct ls_pcie_ep_drvdata lx2_ep_drvdata = {
119	.func_offset = 0x8000,
120	.ops = &ls_pcie_ep_ops,
121	.dw_pcie_ops = &dw_ls_pcie_ep_ops,
122};
123
124static const struct of_device_id ls_pcie_ep_of_match[] = {
125	{ .compatible = "fsl,ls1046a-pcie-ep", .data = &ls1_ep_drvdata },
126	{ .compatible = "fsl,ls1088a-pcie-ep", .data = &ls2_ep_drvdata },
127	{ .compatible = "fsl,ls2088a-pcie-ep", .data = &ls2_ep_drvdata },
128	{ .compatible = "fsl,lx2160ar2-pcie-ep", .data = &lx2_ep_drvdata },
129	{ },
130};
131
132static int __init ls_pcie_ep_probe(struct platform_device *pdev)
133{
134	struct device *dev = &pdev->dev;
135	struct dw_pcie *pci;
136	struct ls_pcie_ep *pcie;
137	struct pci_epc_features *ls_epc;
138	struct resource *dbi_base;
139
140	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
141	if (!pcie)
142		return -ENOMEM;
143
144	pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
145	if (!pci)
146		return -ENOMEM;
147
148	ls_epc = devm_kzalloc(dev, sizeof(*ls_epc), GFP_KERNEL);
149	if (!ls_epc)
150		return -ENOMEM;
151
152	pcie->drvdata = of_device_get_match_data(dev);
153
154	pci->dev = dev;
155	pci->ops = pcie->drvdata->dw_pcie_ops;
156
157	ls_epc->bar_fixed_64bit = (1 << BAR_2) | (1 << BAR_4);
158
159	pcie->pci = pci;
160	pcie->ls_epc = ls_epc;
161
162	dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
163	pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_base);
164	if (IS_ERR(pci->dbi_base))
165		return PTR_ERR(pci->dbi_base);
166
167	pci->ep.ops = &ls_pcie_ep_ops;
168
169	platform_set_drvdata(pdev, pcie);
170
171	return dw_pcie_ep_init(&pci->ep);
172}
173
174static struct platform_driver ls_pcie_ep_driver = {
175	.driver = {
176		.name = "layerscape-pcie-ep",
177		.of_match_table = ls_pcie_ep_of_match,
178		.suppress_bind_attrs = true,
179	},
180};
181builtin_platform_driver_probe(ls_pcie_ep_driver, ls_pcie_ep_probe);