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500a1d9a | 1 | /* |
5930fe4e | 2 | * PCIe host controller driver for HiSilicon SoCs |
500a1d9a ZW |
3 | * |
4 | * Copyright (C) 2015 HiSilicon Co., Ltd. http://www.hisilicon.com | |
5 | * | |
5930fe4e GP |
6 | * Authors: Zhou Wang <wangzhou1@hisilicon.com> |
7 | * Dacai Zhu <zhudacai@hisilicon.com> | |
8 | * Gabriele Paoloni <gabriele.paoloni@huawei.com> | |
500a1d9a ZW |
9 | * |
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. | |
13 | */ | |
14 | #include <linux/interrupt.h> | |
fb38118d | 15 | #include <linux/init.h> |
500a1d9a ZW |
16 | #include <linux/mfd/syscon.h> |
17 | #include <linux/of_address.h> | |
18 | #include <linux/of_pci.h> | |
19 | #include <linux/platform_device.h> | |
5930fe4e | 20 | #include <linux/of_device.h> |
5f00f1a0 DL |
21 | #include <linux/pci.h> |
22 | #include <linux/pci-acpi.h> | |
23 | #include <linux/pci-ecam.h> | |
500a1d9a | 24 | #include <linux/regmap.h> |
5f00f1a0 DL |
25 | #include "../pci.h" |
26 | ||
27 | #if defined(CONFIG_ACPI) && defined(CONFIG_PCI_QUIRKS) | |
28 | ||
29 | static int hisi_pcie_acpi_rd_conf(struct pci_bus *bus, u32 devfn, int where, | |
30 | int size, u32 *val) | |
31 | { | |
32 | struct pci_config_window *cfg = bus->sysdata; | |
33 | int dev = PCI_SLOT(devfn); | |
34 | ||
35 | if (bus->number == cfg->busr.start) { | |
36 | /* access only one slot on each root port */ | |
37 | if (dev > 0) | |
38 | return PCIBIOS_DEVICE_NOT_FOUND; | |
39 | else | |
40 | return pci_generic_config_read32(bus, devfn, where, | |
41 | size, val); | |
42 | } | |
43 | ||
44 | return pci_generic_config_read(bus, devfn, where, size, val); | |
45 | } | |
46 | ||
47 | static int hisi_pcie_acpi_wr_conf(struct pci_bus *bus, u32 devfn, | |
48 | int where, int size, u32 val) | |
49 | { | |
50 | struct pci_config_window *cfg = bus->sysdata; | |
51 | int dev = PCI_SLOT(devfn); | |
52 | ||
53 | if (bus->number == cfg->busr.start) { | |
54 | /* access only one slot on each root port */ | |
55 | if (dev > 0) | |
56 | return PCIBIOS_DEVICE_NOT_FOUND; | |
57 | else | |
58 | return pci_generic_config_write32(bus, devfn, where, | |
59 | size, val); | |
60 | } | |
61 | ||
62 | return pci_generic_config_write(bus, devfn, where, size, val); | |
63 | } | |
64 | ||
65 | static void __iomem *hisi_pcie_map_bus(struct pci_bus *bus, unsigned int devfn, | |
66 | int where) | |
67 | { | |
68 | struct pci_config_window *cfg = bus->sysdata; | |
69 | void __iomem *reg_base = cfg->priv; | |
70 | ||
71 | if (bus->number == cfg->busr.start) | |
72 | return reg_base + where; | |
73 | else | |
74 | return pci_ecam_map_bus(bus, devfn, where); | |
75 | } | |
76 | ||
77 | static int hisi_pcie_init(struct pci_config_window *cfg) | |
78 | { | |
79 | struct device *dev = cfg->parent; | |
80 | struct acpi_device *adev = to_acpi_device(dev); | |
81 | struct acpi_pci_root *root = acpi_driver_data(adev); | |
82 | struct resource *res; | |
83 | void __iomem *reg_base; | |
84 | int ret; | |
85 | ||
86 | /* | |
87 | * Retrieve RC base and size from a HISI0081 device with _UID | |
88 | * matching our segment. | |
89 | */ | |
90 | res = devm_kzalloc(dev, sizeof(*res), GFP_KERNEL); | |
91 | if (!res) | |
92 | return -ENOMEM; | |
93 | ||
94 | ret = acpi_get_rc_resources(dev, "HISI0081", root->segment, res); | |
95 | if (ret) { | |
96 | dev_err(dev, "can't get rc base address\n"); | |
97 | return -ENOMEM; | |
98 | } | |
99 | ||
100 | reg_base = devm_ioremap(dev, res->start, resource_size(res)); | |
101 | if (!reg_base) | |
102 | return -ENOMEM; | |
103 | ||
104 | cfg->priv = reg_base; | |
105 | return 0; | |
106 | } | |
107 | ||
108 | struct pci_ecam_ops hisi_pcie_ops = { | |
109 | .bus_shift = 20, | |
110 | .init = hisi_pcie_init, | |
111 | .pci_ops = { | |
112 | .map_bus = hisi_pcie_map_bus, | |
113 | .read = hisi_pcie_acpi_rd_conf, | |
114 | .write = hisi_pcie_acpi_wr_conf, | |
115 | } | |
116 | }; | |
117 | ||
118 | #endif | |
119 | ||
120 | #ifdef CONFIG_PCI_HISI | |
500a1d9a ZW |
121 | |
122 | #include "pcie-designware.h" | |
123 | ||
a458ce33 BH |
124 | #define PCIE_SUBCTRL_SYS_STATE4_REG 0x6818 |
125 | #define PCIE_HIP06_CTRL_OFF 0x1000 | |
126 | #define PCIE_SYS_STATE4 (PCIE_HIP06_CTRL_OFF + 0x31c) | |
127 | #define PCIE_LTSSM_LINKUP_STATE 0x11 | |
128 | #define PCIE_LTSSM_STATE_MASK 0x3F | |
500a1d9a ZW |
129 | |
130 | #define to_hisi_pcie(x) container_of(x, struct hisi_pcie, pp) | |
131 | ||
5930fe4e GP |
132 | struct hisi_pcie; |
133 | ||
134 | struct pcie_soc_ops { | |
bf4ed37c | 135 | int (*hisi_pcie_link_up)(struct hisi_pcie *hisi_pcie); |
5930fe4e GP |
136 | }; |
137 | ||
500a1d9a | 138 | struct hisi_pcie { |
f84cfdf7 | 139 | struct pcie_port pp; /* pp.dbi_base is DT rc_dbi */ |
500a1d9a | 140 | struct regmap *subctrl; |
500a1d9a | 141 | u32 port_id; |
5930fe4e | 142 | struct pcie_soc_ops *soc_ops; |
500a1d9a ZW |
143 | }; |
144 | ||
5930fe4e | 145 | /* HipXX PCIe host only supports 32-bit config access */ |
500a1d9a ZW |
146 | static int hisi_pcie_cfg_read(struct pcie_port *pp, int where, int size, |
147 | u32 *val) | |
148 | { | |
149 | u32 reg; | |
150 | u32 reg_val; | |
500a1d9a ZW |
151 | void *walker = ®_val; |
152 | ||
153 | walker += (where & 0x3); | |
154 | reg = where & ~0x3; | |
4368f096 | 155 | reg_val = dw_pcie_readl_rc(pp, reg); |
500a1d9a ZW |
156 | |
157 | if (size == 1) | |
158 | *val = *(u8 __force *) walker; | |
159 | else if (size == 2) | |
160 | *val = *(u16 __force *) walker; | |
1dbe162d DL |
161 | else if (size == 4) |
162 | *val = reg_val; | |
163 | else | |
500a1d9a ZW |
164 | return PCIBIOS_BAD_REGISTER_NUMBER; |
165 | ||
166 | return PCIBIOS_SUCCESSFUL; | |
167 | } | |
168 | ||
5930fe4e | 169 | /* HipXX PCIe host only supports 32-bit config access */ |
500a1d9a ZW |
170 | static int hisi_pcie_cfg_write(struct pcie_port *pp, int where, int size, |
171 | u32 val) | |
172 | { | |
173 | u32 reg_val; | |
174 | u32 reg; | |
500a1d9a ZW |
175 | void *walker = ®_val; |
176 | ||
177 | walker += (where & 0x3); | |
178 | reg = where & ~0x3; | |
179 | if (size == 4) | |
4368f096 | 180 | dw_pcie_writel_rc(pp, reg, val); |
500a1d9a | 181 | else if (size == 2) { |
4368f096 | 182 | reg_val = dw_pcie_readl_rc(pp, reg); |
500a1d9a | 183 | *(u16 __force *) walker = val; |
4368f096 | 184 | dw_pcie_writel_rc(pp, reg, reg_val); |
500a1d9a | 185 | } else if (size == 1) { |
4368f096 | 186 | reg_val = dw_pcie_readl_rc(pp, reg); |
500a1d9a | 187 | *(u8 __force *) walker = val; |
4368f096 | 188 | dw_pcie_writel_rc(pp, reg, reg_val); |
500a1d9a ZW |
189 | } else |
190 | return PCIBIOS_BAD_REGISTER_NUMBER; | |
191 | ||
192 | return PCIBIOS_SUCCESSFUL; | |
193 | } | |
194 | ||
5930fe4e | 195 | static int hisi_pcie_link_up_hip05(struct hisi_pcie *hisi_pcie) |
500a1d9a ZW |
196 | { |
197 | u32 val; | |
500a1d9a ZW |
198 | |
199 | regmap_read(hisi_pcie->subctrl, PCIE_SUBCTRL_SYS_STATE4_REG + | |
200 | 0x100 * hisi_pcie->port_id, &val); | |
201 | ||
202 | return ((val & PCIE_LTSSM_STATE_MASK) == PCIE_LTSSM_LINKUP_STATE); | |
203 | } | |
204 | ||
5930fe4e GP |
205 | static int hisi_pcie_link_up_hip06(struct hisi_pcie *hisi_pcie) |
206 | { | |
4368f096 | 207 | struct pcie_port *pp = &hisi_pcie->pp; |
5930fe4e GP |
208 | u32 val; |
209 | ||
a458ce33 | 210 | val = dw_pcie_readl_rc(pp, PCIE_SYS_STATE4); |
5930fe4e GP |
211 | |
212 | return ((val & PCIE_LTSSM_STATE_MASK) == PCIE_LTSSM_LINKUP_STATE); | |
213 | } | |
214 | ||
215 | static int hisi_pcie_link_up(struct pcie_port *pp) | |
216 | { | |
217 | struct hisi_pcie *hisi_pcie = to_hisi_pcie(pp); | |
218 | ||
219 | return hisi_pcie->soc_ops->hisi_pcie_link_up(hisi_pcie); | |
220 | } | |
221 | ||
500a1d9a ZW |
222 | static struct pcie_host_ops hisi_pcie_host_ops = { |
223 | .rd_own_conf = hisi_pcie_cfg_read, | |
224 | .wr_own_conf = hisi_pcie_cfg_write, | |
225 | .link_up = hisi_pcie_link_up, | |
226 | }; | |
227 | ||
e9480b5a BH |
228 | static int hisi_add_pcie_port(struct hisi_pcie *hisi_pcie, |
229 | struct platform_device *pdev) | |
500a1d9a | 230 | { |
e9480b5a | 231 | struct pcie_port *pp = &hisi_pcie->pp; |
88790f99 | 232 | struct device *dev = pp->dev; |
500a1d9a ZW |
233 | int ret; |
234 | u32 port_id; | |
500a1d9a | 235 | |
88790f99 BH |
236 | if (of_property_read_u32(dev->of_node, "port-id", &port_id)) { |
237 | dev_err(dev, "failed to read port-id\n"); | |
500a1d9a ZW |
238 | return -EINVAL; |
239 | } | |
240 | if (port_id > 3) { | |
88790f99 | 241 | dev_err(dev, "Invalid port-id: %d\n", port_id); |
500a1d9a ZW |
242 | return -EINVAL; |
243 | } | |
244 | hisi_pcie->port_id = port_id; | |
245 | ||
246 | pp->ops = &hisi_pcie_host_ops; | |
247 | ||
248 | ret = dw_pcie_host_init(pp); | |
249 | if (ret) { | |
88790f99 | 250 | dev_err(dev, "failed to initialize host\n"); |
500a1d9a ZW |
251 | return ret; |
252 | } | |
253 | ||
254 | return 0; | |
255 | } | |
256 | ||
9f55cf56 | 257 | static int hisi_pcie_probe(struct platform_device *pdev) |
500a1d9a | 258 | { |
88790f99 | 259 | struct device *dev = &pdev->dev; |
500a1d9a ZW |
260 | struct hisi_pcie *hisi_pcie; |
261 | struct pcie_port *pp; | |
5930fe4e | 262 | const struct of_device_id *match; |
500a1d9a | 263 | struct resource *reg; |
5930fe4e | 264 | struct device_driver *driver; |
500a1d9a ZW |
265 | int ret; |
266 | ||
88790f99 | 267 | hisi_pcie = devm_kzalloc(dev, sizeof(*hisi_pcie), GFP_KERNEL); |
500a1d9a ZW |
268 | if (!hisi_pcie) |
269 | return -ENOMEM; | |
270 | ||
271 | pp = &hisi_pcie->pp; | |
88790f99 BH |
272 | pp->dev = dev; |
273 | driver = dev->driver; | |
5930fe4e | 274 | |
88790f99 | 275 | match = of_match_device(driver->of_match_table, dev); |
5930fe4e | 276 | hisi_pcie->soc_ops = (struct pcie_soc_ops *) match->data; |
500a1d9a ZW |
277 | |
278 | hisi_pcie->subctrl = | |
279 | syscon_regmap_lookup_by_compatible("hisilicon,pcie-sas-subctrl"); | |
280 | if (IS_ERR(hisi_pcie->subctrl)) { | |
88790f99 | 281 | dev_err(dev, "cannot get subctrl base\n"); |
500a1d9a ZW |
282 | return PTR_ERR(hisi_pcie->subctrl); |
283 | } | |
284 | ||
285 | reg = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc_dbi"); | |
761c43c7 | 286 | pp->dbi_base = devm_ioremap_resource(dev, reg); |
ad719956 | 287 | if (IS_ERR(pp->dbi_base)) |
761c43c7 | 288 | return PTR_ERR(pp->dbi_base); |
500a1d9a | 289 | |
e9480b5a | 290 | ret = hisi_add_pcie_port(hisi_pcie, pdev); |
500a1d9a ZW |
291 | if (ret) |
292 | return ret; | |
293 | ||
500a1d9a ZW |
294 | return 0; |
295 | } | |
296 | ||
5930fe4e GP |
297 | static struct pcie_soc_ops hip05_ops = { |
298 | &hisi_pcie_link_up_hip05 | |
299 | }; | |
300 | ||
301 | static struct pcie_soc_ops hip06_ops = { | |
302 | &hisi_pcie_link_up_hip06 | |
303 | }; | |
304 | ||
500a1d9a | 305 | static const struct of_device_id hisi_pcie_of_match[] = { |
5930fe4e GP |
306 | { |
307 | .compatible = "hisilicon,hip05-pcie", | |
308 | .data = (void *) &hip05_ops, | |
309 | }, | |
310 | { | |
311 | .compatible = "hisilicon,hip06-pcie", | |
312 | .data = (void *) &hip06_ops, | |
313 | }, | |
500a1d9a ZW |
314 | {}, |
315 | }; | |
316 | ||
500a1d9a ZW |
317 | static struct platform_driver hisi_pcie_driver = { |
318 | .probe = hisi_pcie_probe, | |
319 | .driver = { | |
320 | .name = "hisi-pcie", | |
321 | .of_match_table = hisi_pcie_of_match, | |
322 | }, | |
323 | }; | |
fb38118d | 324 | builtin_platform_driver(hisi_pcie_driver); |
5f00f1a0 DL |
325 | |
326 | #endif |