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 const struct pci_epc_features*
 36ls_pcie_ep_get_features(struct dw_pcie_ep *ep)
 37{
 38	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 39	struct ls_pcie_ep *pcie = to_ls_pcie_ep(pci);
 40
 41	return pcie->ls_epc;
 42}
 43
 44static void ls_pcie_ep_init(struct dw_pcie_ep *ep)
 45{
 46	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 47	struct ls_pcie_ep *pcie = to_ls_pcie_ep(pci);
 48	struct dw_pcie_ep_func *ep_func;
 49	enum pci_barno bar;
 50
 51	ep_func = dw_pcie_ep_get_func_from_ep(ep, 0);
 52	if (!ep_func)
 53		return;
 54
 55	for (bar = 0; bar < PCI_STD_NUM_BARS; bar++)
 56		dw_pcie_ep_reset_bar(pci, bar);
 57
 58	pcie->ls_epc->msi_capable = ep_func->msi_cap ? true : false;
 59	pcie->ls_epc->msix_capable = ep_func->msix_cap ? true : false;
 60}
 61
 62static int ls_pcie_ep_raise_irq(struct dw_pcie_ep *ep, u8 func_no,
 63				enum pci_epc_irq_type type, u16 interrupt_num)
 64{
 65	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 66
 67	switch (type) {
 68	case PCI_EPC_IRQ_LEGACY:
 69		return dw_pcie_ep_raise_legacy_irq(ep, func_no);
 70	case PCI_EPC_IRQ_MSI:
 71		return dw_pcie_ep_raise_msi_irq(ep, func_no, interrupt_num);
 72	case PCI_EPC_IRQ_MSIX:
 73		return dw_pcie_ep_raise_msix_irq_doorbell(ep, func_no,
 74							  interrupt_num);
 75	default:
 76		dev_err(pci->dev, "UNKNOWN IRQ type\n");
 77		return -EINVAL;
 78	}
 79}
 80
 81static unsigned int ls_pcie_ep_func_conf_select(struct dw_pcie_ep *ep,
 82						u8 func_no)
 83{
 84	struct dw_pcie *pci = to_dw_pcie_from_ep(ep);
 85	struct ls_pcie_ep *pcie = to_ls_pcie_ep(pci);
 86
 87	WARN_ON(func_no && !pcie->drvdata->func_offset);
 88	return pcie->drvdata->func_offset * func_no;
 89}
 90
 91static const struct dw_pcie_ep_ops ls_pcie_ep_ops = {
 92	.ep_init = ls_pcie_ep_init,
 93	.raise_irq = ls_pcie_ep_raise_irq,
 94	.get_features = ls_pcie_ep_get_features,
 95	.func_conf_select = ls_pcie_ep_func_conf_select,
 96};
 97
 98static const struct ls_pcie_ep_drvdata ls1_ep_drvdata = {
 99	.ops = &ls_pcie_ep_ops,
100};
101
102static const struct ls_pcie_ep_drvdata ls2_ep_drvdata = {
103	.func_offset = 0x20000,
104	.ops = &ls_pcie_ep_ops,
105};
106
107static const struct ls_pcie_ep_drvdata lx2_ep_drvdata = {
108	.func_offset = 0x8000,
109	.ops = &ls_pcie_ep_ops,
110};
111
112static const struct of_device_id ls_pcie_ep_of_match[] = {
113	{ .compatible = "fsl,ls1046a-pcie-ep", .data = &ls1_ep_drvdata },
114	{ .compatible = "fsl,ls1088a-pcie-ep", .data = &ls2_ep_drvdata },
115	{ .compatible = "fsl,ls2088a-pcie-ep", .data = &ls2_ep_drvdata },
116	{ .compatible = "fsl,lx2160ar2-pcie-ep", .data = &lx2_ep_drvdata },
117	{ },
118};
119
120static int __init ls_pcie_ep_probe(struct platform_device *pdev)
121{
122	struct device *dev = &pdev->dev;
123	struct dw_pcie *pci;
124	struct ls_pcie_ep *pcie;
125	struct pci_epc_features *ls_epc;
126	struct resource *dbi_base;
127
128	pcie = devm_kzalloc(dev, sizeof(*pcie), GFP_KERNEL);
129	if (!pcie)
130		return -ENOMEM;
131
132	pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
133	if (!pci)
134		return -ENOMEM;
135
136	ls_epc = devm_kzalloc(dev, sizeof(*ls_epc), GFP_KERNEL);
137	if (!ls_epc)
138		return -ENOMEM;
139
140	pcie->drvdata = of_device_get_match_data(dev);
141
142	pci->dev = dev;
143	pci->ops = pcie->drvdata->dw_pcie_ops;
144
145	ls_epc->bar_fixed_64bit = (1 << BAR_2) | (1 << BAR_4);
146
147	pcie->pci = pci;
148	pcie->ls_epc = ls_epc;
149
150	dbi_base = platform_get_resource_byname(pdev, IORESOURCE_MEM, "regs");
151	pci->dbi_base = devm_pci_remap_cfg_resource(dev, dbi_base);
152	if (IS_ERR(pci->dbi_base))
153		return PTR_ERR(pci->dbi_base);
154
155	pci->ep.ops = &ls_pcie_ep_ops;
156
157	platform_set_drvdata(pdev, pcie);
158
159	return dw_pcie_ep_init(&pci->ep);
160}
161
162static struct platform_driver ls_pcie_ep_driver = {
163	.driver = {
164		.name = "layerscape-pcie-ep",
165		.of_match_table = ls_pcie_ep_of_match,
166		.suppress_bind_attrs = true,
167	},
168};
169builtin_platform_driver_probe(ls_pcie_ep_driver, ls_pcie_ep_probe);