diff options
Diffstat (limited to 'drivers/pci/controller/dwc/pcie-histb.c')
-rw-r--r-- | drivers/pci/controller/dwc/pcie-histb.c | 472 |
1 files changed, 472 insertions, 0 deletions
diff --git a/drivers/pci/controller/dwc/pcie-histb.c b/drivers/pci/controller/dwc/pcie-histb.c new file mode 100644 index 000000000000..3611d6ce9a92 --- /dev/null +++ b/drivers/pci/controller/dwc/pcie-histb.c | |||
@@ -0,0 +1,472 @@ | |||
1 | // SPDX-License-Identifier: GPL-2.0 | ||
2 | /* | ||
3 | * PCIe host controller driver for HiSilicon STB SoCs | ||
4 | * | ||
5 | * Copyright (C) 2016-2017 HiSilicon Co., Ltd. http://www.hisilicon.com | ||
6 | * | ||
7 | * Authors: Ruqiang Ju <juruqiang@hisilicon.com> | ||
8 | * Jianguo Sun <sunjianguo1@huawei.com> | ||
9 | */ | ||
10 | |||
11 | #include <linux/clk.h> | ||
12 | #include <linux/delay.h> | ||
13 | #include <linux/interrupt.h> | ||
14 | #include <linux/kernel.h> | ||
15 | #include <linux/module.h> | ||
16 | #include <linux/of.h> | ||
17 | #include <linux/of_gpio.h> | ||
18 | #include <linux/pci.h> | ||
19 | #include <linux/phy/phy.h> | ||
20 | #include <linux/platform_device.h> | ||
21 | #include <linux/resource.h> | ||
22 | #include <linux/reset.h> | ||
23 | |||
24 | #include "pcie-designware.h" | ||
25 | |||
26 | #define to_histb_pcie(x) dev_get_drvdata((x)->dev) | ||
27 | |||
28 | #define PCIE_SYS_CTRL0 0x0000 | ||
29 | #define PCIE_SYS_CTRL1 0x0004 | ||
30 | #define PCIE_SYS_CTRL7 0x001C | ||
31 | #define PCIE_SYS_CTRL13 0x0034 | ||
32 | #define PCIE_SYS_CTRL15 0x003C | ||
33 | #define PCIE_SYS_CTRL16 0x0040 | ||
34 | #define PCIE_SYS_CTRL17 0x0044 | ||
35 | |||
36 | #define PCIE_SYS_STAT0 0x0100 | ||
37 | #define PCIE_SYS_STAT4 0x0110 | ||
38 | |||
39 | #define PCIE_RDLH_LINK_UP BIT(5) | ||
40 | #define PCIE_XMLH_LINK_UP BIT(15) | ||
41 | #define PCIE_ELBI_SLV_DBI_ENABLE BIT(21) | ||
42 | #define PCIE_APP_LTSSM_ENABLE BIT(11) | ||
43 | |||
44 | #define PCIE_DEVICE_TYPE_MASK GENMASK(31, 28) | ||
45 | #define PCIE_WM_EP 0 | ||
46 | #define PCIE_WM_LEGACY BIT(1) | ||
47 | #define PCIE_WM_RC BIT(30) | ||
48 | |||
49 | #define PCIE_LTSSM_STATE_MASK GENMASK(5, 0) | ||
50 | #define PCIE_LTSSM_STATE_ACTIVE 0x11 | ||
51 | |||
52 | struct histb_pcie { | ||
53 | struct dw_pcie *pci; | ||
54 | struct clk *aux_clk; | ||
55 | struct clk *pipe_clk; | ||
56 | struct clk *sys_clk; | ||
57 | struct clk *bus_clk; | ||
58 | struct phy *phy; | ||
59 | struct reset_control *soft_reset; | ||
60 | struct reset_control *sys_reset; | ||
61 | struct reset_control *bus_reset; | ||
62 | void __iomem *ctrl; | ||
63 | int reset_gpio; | ||
64 | struct regulator *vpcie; | ||
65 | }; | ||
66 | |||
67 | static u32 histb_pcie_readl(struct histb_pcie *histb_pcie, u32 reg) | ||
68 | { | ||
69 | return readl(histb_pcie->ctrl + reg); | ||
70 | } | ||
71 | |||
72 | static void histb_pcie_writel(struct histb_pcie *histb_pcie, u32 reg, u32 val) | ||
73 | { | ||
74 | writel(val, histb_pcie->ctrl + reg); | ||
75 | } | ||
76 | |||
77 | static void histb_pcie_dbi_w_mode(struct pcie_port *pp, bool enable) | ||
78 | { | ||
79 | struct dw_pcie *pci = to_dw_pcie_from_pp(pp); | ||
80 | struct histb_pcie *hipcie = to_histb_pcie(pci); | ||
81 | u32 val; | ||
82 | |||
83 | val = histb_pcie_readl(hipcie, PCIE_SYS_CTRL0); | ||
84 | if (enable) | ||
85 | val |= PCIE_ELBI_SLV_DBI_ENABLE; | ||
86 | else | ||
87 | val &= ~PCIE_ELBI_SLV_DBI_ENABLE; | ||
88 | histb_pcie_writel(hipcie, PCIE_SYS_CTRL0, val); | ||
89 | } | ||
90 | |||
91 | static void histb_pcie_dbi_r_mode(struct pcie_port *pp, bool enable) | ||
92 | { | ||
93 | struct dw_pcie *pci = to_dw_pcie_from_pp(pp); | ||
94 | struct histb_pcie *hipcie = to_histb_pcie(pci); | ||
95 | u32 val; | ||
96 | |||
97 | val = histb_pcie_readl(hipcie, PCIE_SYS_CTRL1); | ||
98 | if (enable) | ||
99 | val |= PCIE_ELBI_SLV_DBI_ENABLE; | ||
100 | else | ||
101 | val &= ~PCIE_ELBI_SLV_DBI_ENABLE; | ||
102 | histb_pcie_writel(hipcie, PCIE_SYS_CTRL1, val); | ||
103 | } | ||
104 | |||
105 | static u32 histb_pcie_read_dbi(struct dw_pcie *pci, void __iomem *base, | ||
106 | u32 reg, size_t size) | ||
107 | { | ||
108 | u32 val; | ||
109 | |||
110 | histb_pcie_dbi_r_mode(&pci->pp, true); | ||
111 | dw_pcie_read(base + reg, size, &val); | ||
112 | histb_pcie_dbi_r_mode(&pci->pp, false); | ||
113 | |||
114 | return val; | ||
115 | } | ||
116 | |||
117 | static void histb_pcie_write_dbi(struct dw_pcie *pci, void __iomem *base, | ||
118 | u32 reg, size_t size, u32 val) | ||
119 | { | ||
120 | histb_pcie_dbi_w_mode(&pci->pp, true); | ||
121 | dw_pcie_write(base + reg, size, val); | ||
122 | histb_pcie_dbi_w_mode(&pci->pp, false); | ||
123 | } | ||
124 | |||
125 | static int histb_pcie_rd_own_conf(struct pcie_port *pp, int where, | ||
126 | int size, u32 *val) | ||
127 | { | ||
128 | struct dw_pcie *pci = to_dw_pcie_from_pp(pp); | ||
129 | int ret; | ||
130 | |||
131 | histb_pcie_dbi_r_mode(pp, true); | ||
132 | ret = dw_pcie_read(pci->dbi_base + where, size, val); | ||
133 | histb_pcie_dbi_r_mode(pp, false); | ||
134 | |||
135 | return ret; | ||
136 | } | ||
137 | |||
138 | static int histb_pcie_wr_own_conf(struct pcie_port *pp, int where, | ||
139 | int size, u32 val) | ||
140 | { | ||
141 | struct dw_pcie *pci = to_dw_pcie_from_pp(pp); | ||
142 | int ret; | ||
143 | |||
144 | histb_pcie_dbi_w_mode(pp, true); | ||
145 | ret = dw_pcie_write(pci->dbi_base + where, size, val); | ||
146 | histb_pcie_dbi_w_mode(pp, false); | ||
147 | |||
148 | return ret; | ||
149 | } | ||
150 | |||
151 | static int histb_pcie_link_up(struct dw_pcie *pci) | ||
152 | { | ||
153 | struct histb_pcie *hipcie = to_histb_pcie(pci); | ||
154 | u32 regval; | ||
155 | u32 status; | ||
156 | |||
157 | regval = histb_pcie_readl(hipcie, PCIE_SYS_STAT0); | ||
158 | status = histb_pcie_readl(hipcie, PCIE_SYS_STAT4); | ||
159 | status &= PCIE_LTSSM_STATE_MASK; | ||
160 | if ((regval & PCIE_XMLH_LINK_UP) && (regval & PCIE_RDLH_LINK_UP) && | ||
161 | (status == PCIE_LTSSM_STATE_ACTIVE)) | ||
162 | return 1; | ||
163 | |||
164 | return 0; | ||
165 | } | ||
166 | |||
167 | static int histb_pcie_establish_link(struct pcie_port *pp) | ||
168 | { | ||
169 | struct dw_pcie *pci = to_dw_pcie_from_pp(pp); | ||
170 | struct histb_pcie *hipcie = to_histb_pcie(pci); | ||
171 | u32 regval; | ||
172 | |||
173 | if (dw_pcie_link_up(pci)) { | ||
174 | dev_info(pci->dev, "Link already up\n"); | ||
175 | return 0; | ||
176 | } | ||
177 | |||
178 | /* PCIe RC work mode */ | ||
179 | regval = histb_pcie_readl(hipcie, PCIE_SYS_CTRL0); | ||
180 | regval &= ~PCIE_DEVICE_TYPE_MASK; | ||
181 | regval |= PCIE_WM_RC; | ||
182 | histb_pcie_writel(hipcie, PCIE_SYS_CTRL0, regval); | ||
183 | |||
184 | /* setup root complex */ | ||
185 | dw_pcie_setup_rc(pp); | ||
186 | |||
187 | /* assert LTSSM enable */ | ||
188 | regval = histb_pcie_readl(hipcie, PCIE_SYS_CTRL7); | ||
189 | regval |= PCIE_APP_LTSSM_ENABLE; | ||
190 | histb_pcie_writel(hipcie, PCIE_SYS_CTRL7, regval); | ||
191 | |||
192 | return dw_pcie_wait_for_link(pci); | ||
193 | } | ||
194 | |||
195 | static int histb_pcie_host_init(struct pcie_port *pp) | ||
196 | { | ||
197 | histb_pcie_establish_link(pp); | ||
198 | |||
199 | if (IS_ENABLED(CONFIG_PCI_MSI)) | ||
200 | dw_pcie_msi_init(pp); | ||
201 | |||
202 | return 0; | ||
203 | } | ||
204 | |||
205 | static struct dw_pcie_host_ops histb_pcie_host_ops = { | ||
206 | .rd_own_conf = histb_pcie_rd_own_conf, | ||
207 | .wr_own_conf = histb_pcie_wr_own_conf, | ||
208 | .host_init = histb_pcie_host_init, | ||
209 | }; | ||
210 | |||
211 | static void histb_pcie_host_disable(struct histb_pcie *hipcie) | ||
212 | { | ||
213 | reset_control_assert(hipcie->soft_reset); | ||
214 | reset_control_assert(hipcie->sys_reset); | ||
215 | reset_control_assert(hipcie->bus_reset); | ||
216 | |||
217 | clk_disable_unprepare(hipcie->aux_clk); | ||
218 | clk_disable_unprepare(hipcie->pipe_clk); | ||
219 | clk_disable_unprepare(hipcie->sys_clk); | ||
220 | clk_disable_unprepare(hipcie->bus_clk); | ||
221 | |||
222 | if (gpio_is_valid(hipcie->reset_gpio)) | ||
223 | gpio_set_value_cansleep(hipcie->reset_gpio, 0); | ||
224 | |||
225 | if (hipcie->vpcie) | ||
226 | regulator_disable(hipcie->vpcie); | ||
227 | } | ||
228 | |||
229 | static int histb_pcie_host_enable(struct pcie_port *pp) | ||
230 | { | ||
231 | struct dw_pcie *pci = to_dw_pcie_from_pp(pp); | ||
232 | struct histb_pcie *hipcie = to_histb_pcie(pci); | ||
233 | struct device *dev = pci->dev; | ||
234 | int ret; | ||
235 | |||
236 | /* power on PCIe device if have */ | ||
237 | if (hipcie->vpcie) { | ||
238 | ret = regulator_enable(hipcie->vpcie); | ||
239 | if (ret) { | ||
240 | dev_err(dev, "failed to enable regulator: %d\n", ret); | ||
241 | return ret; | ||
242 | } | ||
243 | } | ||
244 | |||
245 | if (gpio_is_valid(hipcie->reset_gpio)) | ||
246 | gpio_set_value_cansleep(hipcie->reset_gpio, 1); | ||
247 | |||
248 | ret = clk_prepare_enable(hipcie->bus_clk); | ||
249 | if (ret) { | ||
250 | dev_err(dev, "cannot prepare/enable bus clk\n"); | ||
251 | goto err_bus_clk; | ||
252 | } | ||
253 | |||
254 | ret = clk_prepare_enable(hipcie->sys_clk); | ||
255 | if (ret) { | ||
256 | dev_err(dev, "cannot prepare/enable sys clk\n"); | ||
257 | goto err_sys_clk; | ||
258 | } | ||
259 | |||
260 | ret = clk_prepare_enable(hipcie->pipe_clk); | ||
261 | if (ret) { | ||
262 | dev_err(dev, "cannot prepare/enable pipe clk\n"); | ||
263 | goto err_pipe_clk; | ||
264 | } | ||
265 | |||
266 | ret = clk_prepare_enable(hipcie->aux_clk); | ||
267 | if (ret) { | ||
268 | dev_err(dev, "cannot prepare/enable aux clk\n"); | ||
269 | goto err_aux_clk; | ||
270 | } | ||
271 | |||
272 | reset_control_assert(hipcie->soft_reset); | ||
273 | reset_control_deassert(hipcie->soft_reset); | ||
274 | |||
275 | reset_control_assert(hipcie->sys_reset); | ||
276 | reset_control_deassert(hipcie->sys_reset); | ||
277 | |||
278 | reset_control_assert(hipcie->bus_reset); | ||
279 | reset_control_deassert(hipcie->bus_reset); | ||
280 | |||
281 | return 0; | ||
282 | |||
283 | err_aux_clk: | ||
284 | clk_disable_unprepare(hipcie->pipe_clk); | ||
285 | err_pipe_clk: | ||
286 | clk_disable_unprepare(hipcie->sys_clk); | ||
287 | err_sys_clk: | ||
288 | clk_disable_unprepare(hipcie->bus_clk); | ||
289 | err_bus_clk: | ||
290 | if (hipcie->vpcie) | ||
291 | regulator_disable(hipcie->vpcie); | ||
292 | |||
293 | return ret; | ||
294 | } | ||
295 | |||
296 | static const struct dw_pcie_ops dw_pcie_ops = { | ||
297 | .read_dbi = histb_pcie_read_dbi, | ||
298 | .write_dbi = histb_pcie_write_dbi, | ||
299 | .link_up = histb_pcie_link_up, | ||
300 | }; | ||
301 | |||
302 | static int histb_pcie_probe(struct platform_device *pdev) | ||
303 | { | ||
304 | struct histb_pcie *hipcie; | ||
305 | struct dw_pcie *pci; | ||
306 | struct pcie_port *pp; | ||
307 | struct resource *res; | ||
308 | struct device_node *np = pdev->dev.of_node; | ||
309 | struct device *dev = &pdev->dev; | ||
310 | enum of_gpio_flags of_flags; | ||
311 | unsigned long flag = GPIOF_DIR_OUT; | ||
312 | int ret; | ||
313 | |||
314 | hipcie = devm_kzalloc(dev, sizeof(*hipcie), GFP_KERNEL); | ||
315 | if (!hipcie) | ||
316 | return -ENOMEM; | ||
317 | |||
318 | pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL); | ||
319 | if (!pci) | ||
320 | return -ENOMEM; | ||
321 | |||
322 | hipcie->pci = pci; | ||
323 | pp = &pci->pp; | ||
324 | pci->dev = dev; | ||
325 | pci->ops = &dw_pcie_ops; | ||
326 | |||
327 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "control"); | ||
328 | hipcie->ctrl = devm_ioremap_resource(dev, res); | ||
329 | if (IS_ERR(hipcie->ctrl)) { | ||
330 | dev_err(dev, "cannot get control reg base\n"); | ||
331 | return PTR_ERR(hipcie->ctrl); | ||
332 | } | ||
333 | |||
334 | res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "rc-dbi"); | ||
335 | pci->dbi_base = devm_ioremap_resource(dev, res); | ||
336 | if (IS_ERR(pci->dbi_base)) { | ||
337 | dev_err(dev, "cannot get rc-dbi base\n"); | ||
338 | return PTR_ERR(pci->dbi_base); | ||
339 | } | ||
340 | |||
341 | hipcie->vpcie = devm_regulator_get_optional(dev, "vpcie"); | ||
342 | if (IS_ERR(hipcie->vpcie)) { | ||
343 | if (PTR_ERR(hipcie->vpcie) == -EPROBE_DEFER) | ||
344 | return -EPROBE_DEFER; | ||
345 | hipcie->vpcie = NULL; | ||
346 | } | ||
347 | |||
348 | hipcie->reset_gpio = of_get_named_gpio_flags(np, | ||
349 | "reset-gpios", 0, &of_flags); | ||
350 | if (of_flags & OF_GPIO_ACTIVE_LOW) | ||
351 | flag |= GPIOF_ACTIVE_LOW; | ||
352 | if (gpio_is_valid(hipcie->reset_gpio)) { | ||
353 | ret = devm_gpio_request_one(dev, hipcie->reset_gpio, | ||
354 | flag, "PCIe device power control"); | ||
355 | if (ret) { | ||
356 | dev_err(dev, "unable to request gpio\n"); | ||
357 | return ret; | ||
358 | } | ||
359 | } | ||
360 | |||
361 | hipcie->aux_clk = devm_clk_get(dev, "aux"); | ||
362 | if (IS_ERR(hipcie->aux_clk)) { | ||
363 | dev_err(dev, "Failed to get PCIe aux clk\n"); | ||
364 | return PTR_ERR(hipcie->aux_clk); | ||
365 | } | ||
366 | |||
367 | hipcie->pipe_clk = devm_clk_get(dev, "pipe"); | ||
368 | if (IS_ERR(hipcie->pipe_clk)) { | ||
369 | dev_err(dev, "Failed to get PCIe pipe clk\n"); | ||
370 | return PTR_ERR(hipcie->pipe_clk); | ||
371 | } | ||
372 | |||
373 | hipcie->sys_clk = devm_clk_get(dev, "sys"); | ||
374 | if (IS_ERR(hipcie->sys_clk)) { | ||
375 | dev_err(dev, "Failed to get PCIEe sys clk\n"); | ||
376 | return PTR_ERR(hipcie->sys_clk); | ||
377 | } | ||
378 | |||
379 | hipcie->bus_clk = devm_clk_get(dev, "bus"); | ||
380 | if (IS_ERR(hipcie->bus_clk)) { | ||
381 | dev_err(dev, "Failed to get PCIe bus clk\n"); | ||
382 | return PTR_ERR(hipcie->bus_clk); | ||
383 | } | ||
384 | |||
385 | hipcie->soft_reset = devm_reset_control_get(dev, "soft"); | ||
386 | if (IS_ERR(hipcie->soft_reset)) { | ||
387 | dev_err(dev, "couldn't get soft reset\n"); | ||
388 | return PTR_ERR(hipcie->soft_reset); | ||
389 | } | ||
390 | |||
391 | hipcie->sys_reset = devm_reset_control_get(dev, "sys"); | ||
392 | if (IS_ERR(hipcie->sys_reset)) { | ||
393 | dev_err(dev, "couldn't get sys reset\n"); | ||
394 | return PTR_ERR(hipcie->sys_reset); | ||
395 | } | ||
396 | |||
397 | hipcie->bus_reset = devm_reset_control_get(dev, "bus"); | ||
398 | if (IS_ERR(hipcie->bus_reset)) { | ||
399 | dev_err(dev, "couldn't get bus reset\n"); | ||
400 | return PTR_ERR(hipcie->bus_reset); | ||
401 | } | ||
402 | |||
403 | if (IS_ENABLED(CONFIG_PCI_MSI)) { | ||
404 | pp->msi_irq = platform_get_irq_byname(pdev, "msi"); | ||
405 | if (pp->msi_irq < 0) { | ||
406 | dev_err(dev, "Failed to get MSI IRQ\n"); | ||
407 | return pp->msi_irq; | ||
408 | } | ||
409 | } | ||
410 | |||
411 | hipcie->phy = devm_phy_get(dev, "phy"); | ||
412 | if (IS_ERR(hipcie->phy)) { | ||
413 | dev_info(dev, "no pcie-phy found\n"); | ||
414 | hipcie->phy = NULL; | ||
415 | /* fall through here! | ||
416 | * if no pcie-phy found, phy init | ||
417 | * should be done under boot! | ||
418 | */ | ||
419 | } else { | ||
420 | phy_init(hipcie->phy); | ||
421 | } | ||
422 | |||
423 | pp->root_bus_nr = -1; | ||
424 | pp->ops = &histb_pcie_host_ops; | ||
425 | |||
426 | platform_set_drvdata(pdev, hipcie); | ||
427 | |||
428 | ret = histb_pcie_host_enable(pp); | ||
429 | if (ret) { | ||
430 | dev_err(dev, "failed to enable host\n"); | ||
431 | return ret; | ||
432 | } | ||
433 | |||
434 | ret = dw_pcie_host_init(pp); | ||
435 | if (ret) { | ||
436 | dev_err(dev, "failed to initialize host\n"); | ||
437 | return ret; | ||
438 | } | ||
439 | |||
440 | return 0; | ||
441 | } | ||
442 | |||
443 | static int histb_pcie_remove(struct platform_device *pdev) | ||
444 | { | ||
445 | struct histb_pcie *hipcie = platform_get_drvdata(pdev); | ||
446 | |||
447 | histb_pcie_host_disable(hipcie); | ||
448 | |||
449 | if (hipcie->phy) | ||
450 | phy_exit(hipcie->phy); | ||
451 | |||
452 | return 0; | ||
453 | } | ||
454 | |||
455 | static const struct of_device_id histb_pcie_of_match[] = { | ||
456 | { .compatible = "hisilicon,hi3798cv200-pcie", }, | ||
457 | {}, | ||
458 | }; | ||
459 | MODULE_DEVICE_TABLE(of, histb_pcie_of_match); | ||
460 | |||
461 | static struct platform_driver histb_pcie_platform_driver = { | ||
462 | .probe = histb_pcie_probe, | ||
463 | .remove = histb_pcie_remove, | ||
464 | .driver = { | ||
465 | .name = "histb-pcie", | ||
466 | .of_match_table = histb_pcie_of_match, | ||
467 | }, | ||
468 | }; | ||
469 | module_platform_driver(histb_pcie_platform_driver); | ||
470 | |||
471 | MODULE_DESCRIPTION("HiSilicon STB PCIe host controller driver"); | ||
472 | MODULE_LICENSE("GPL v2"); | ||