2 * PCIe host controller driver for HiSilicon SoCs
4 * Copyright (C) 2015 HiSilicon Co., Ltd. http://www.hisilicon.com
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
14 #include <linux/interrupt.h>
15 #include <linux/module.h>
16 #include <linux/mfd/syscon.h>
17 #include <linux/of_address.h>
18 #include <linux/of_pci.h>
19 #include <linux/platform_device.h>
20 #include <linux/of_device.h>
21 #include <linux/regmap.h>
23 #include "pcie-designware.h"
25 #define PCIE_LTSSM_LINKUP_STATE 0x11
26 #define PCIE_LTSSM_STATE_MASK 0x3F
27 #define PCIE_SUBCTRL_SYS_STATE4_REG 0x6818
28 #define PCIE_SYS_STATE4 0x31c
29 #define PCIE_HIP06_CTRL_OFF 0x1000
31 #define to_hisi_pcie(x) container_of(x, struct hisi_pcie, pp)
36 int (*hisi_pcie_link_up)(struct hisi_pcie *pcie);
40 struct regmap *subctrl;
41 void __iomem *reg_base;
44 struct pcie_soc_ops *soc_ops;
47 static inline void hisi_pcie_apb_writel(struct hisi_pcie *pcie,
50 writel(val, pcie->reg_base + reg);
53 static inline u32 hisi_pcie_apb_readl(struct hisi_pcie *pcie, u32 reg)
55 return readl(pcie->reg_base + reg);
58 /* HipXX PCIe host only supports 32-bit config access */
59 static int hisi_pcie_cfg_read(struct pcie_port *pp, int where, int size,
64 struct hisi_pcie *pcie = to_hisi_pcie(pp);
65 void *walker = ®_val;
67 walker += (where & 0x3);
69 reg_val = hisi_pcie_apb_readl(pcie, reg);
72 *val = *(u8 __force *) walker;
74 *val = *(u16 __force *) walker;
78 return PCIBIOS_BAD_REGISTER_NUMBER;
80 return PCIBIOS_SUCCESSFUL;
83 /* HipXX PCIe host only supports 32-bit config access */
84 static int hisi_pcie_cfg_write(struct pcie_port *pp, int where, int size,
89 struct hisi_pcie *pcie = to_hisi_pcie(pp);
90 void *walker = ®_val;
92 walker += (where & 0x3);
95 hisi_pcie_apb_writel(pcie, val, reg);
97 reg_val = hisi_pcie_apb_readl(pcie, reg);
98 *(u16 __force *) walker = val;
99 hisi_pcie_apb_writel(pcie, reg_val, reg);
100 } else if (size == 1) {
101 reg_val = hisi_pcie_apb_readl(pcie, reg);
102 *(u8 __force *) walker = val;
103 hisi_pcie_apb_writel(pcie, reg_val, reg);
105 return PCIBIOS_BAD_REGISTER_NUMBER;
107 return PCIBIOS_SUCCESSFUL;
110 static int hisi_pcie_link_up_hip05(struct hisi_pcie *hisi_pcie)
114 regmap_read(hisi_pcie->subctrl, PCIE_SUBCTRL_SYS_STATE4_REG +
115 0x100 * hisi_pcie->port_id, &val);
117 return ((val & PCIE_LTSSM_STATE_MASK) == PCIE_LTSSM_LINKUP_STATE);
120 static int hisi_pcie_link_up_hip06(struct hisi_pcie *hisi_pcie)
124 val = hisi_pcie_apb_readl(hisi_pcie, PCIE_HIP06_CTRL_OFF +
127 return ((val & PCIE_LTSSM_STATE_MASK) == PCIE_LTSSM_LINKUP_STATE);
130 static int hisi_pcie_link_up(struct pcie_port *pp)
132 struct hisi_pcie *hisi_pcie = to_hisi_pcie(pp);
134 return hisi_pcie->soc_ops->hisi_pcie_link_up(hisi_pcie);
137 static struct pcie_host_ops hisi_pcie_host_ops = {
138 .rd_own_conf = hisi_pcie_cfg_read,
139 .wr_own_conf = hisi_pcie_cfg_write,
140 .link_up = hisi_pcie_link_up,
143 static int hisi_add_pcie_port(struct pcie_port *pp,
144 struct platform_device *pdev)
148 struct hisi_pcie *hisi_pcie = to_hisi_pcie(pp);
150 if (of_property_read_u32(pdev->dev.of_node, "port-id", &port_id)) {
151 dev_err(&pdev->dev, "failed to read port-id\n");
155 dev_err(&pdev->dev, "Invalid port-id: %d\n", port_id);
158 hisi_pcie->port_id = port_id;
160 pp->ops = &hisi_pcie_host_ops;
162 ret = dw_pcie_host_init(pp);
164 dev_err(&pdev->dev, "failed to initialize host\n");
171 static int hisi_pcie_probe(struct platform_device *pdev)
173 struct hisi_pcie *hisi_pcie;
174 struct pcie_port *pp;
175 const struct of_device_id *match;
176 struct resource *reg;
177 struct device_driver *driver;
180 hisi_pcie = devm_kzalloc(&pdev->dev, sizeof(*hisi_pcie), GFP_KERNEL);
185 pp->dev = &pdev->dev;
186 driver = (pdev->dev).driver;
188 match = of_match_device(driver->of_match_table, &pdev->dev);
189 hisi_pcie->soc_ops = (struct pcie_soc_ops *) match->data;
192 syscon_regmap_lookup_by_compatible("hisilicon,pcie-sas-subctrl");
193 if (IS_ERR(hisi_pcie->subctrl)) {
194 dev_err(pp->dev, "cannot get subctrl base\n");
195 return PTR_ERR(hisi_pcie->subctrl);
198 reg = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc_dbi");
199 hisi_pcie->reg_base = devm_ioremap_resource(&pdev->dev, reg);
200 if (IS_ERR(hisi_pcie->reg_base)) {
201 dev_err(pp->dev, "cannot get rc_dbi base\n");
202 return PTR_ERR(hisi_pcie->reg_base);
205 hisi_pcie->pp.dbi_base = hisi_pcie->reg_base;
207 ret = hisi_add_pcie_port(pp, pdev);
211 platform_set_drvdata(pdev, hisi_pcie);
213 dev_warn(pp->dev, "only 32-bit config accesses supported; smaller writes may corrupt adjacent RW1C fields\n");
218 static struct pcie_soc_ops hip05_ops = {
219 &hisi_pcie_link_up_hip05
222 static struct pcie_soc_ops hip06_ops = {
223 &hisi_pcie_link_up_hip06
226 static const struct of_device_id hisi_pcie_of_match[] = {
228 .compatible = "hisilicon,hip05-pcie",
229 .data = (void *) &hip05_ops,
232 .compatible = "hisilicon,hip06-pcie",
233 .data = (void *) &hip06_ops,
239 MODULE_DEVICE_TABLE(of, hisi_pcie_of_match);
241 static struct platform_driver hisi_pcie_driver = {
242 .probe = hisi_pcie_probe,
245 .of_match_table = hisi_pcie_of_match,
249 module_platform_driver(hisi_pcie_driver);
254 MODULE_LICENSE("GPL v2");