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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Rockchip AXI PCIe host controller driver
4 *
5 * Copyright (c) 2016 Rockchip, Inc.
6 *
7 * Author: Shawn Lin <shawn.lin@rock-chips.com>
8 * Wenrui Li <wenrui.li@rock-chips.com>
9 *
10 * Bits taken from Synopsys DesignWare Host controller driver and
11 * ARM PCI Host generic driver.
12 */
13
14#include <linux/clk.h>
15#include <linux/delay.h>
16#include <linux/gpio/consumer.h>
17#include <linux/of_pci.h>
18#include <linux/phy/phy.h>
19#include <linux/platform_device.h>
20#include <linux/reset.h>
21
22#include "../pci.h"
23#include "pcie-rockchip.h"
24
25int rockchip_pcie_parse_dt(struct rockchip_pcie *rockchip)
26{
27 struct device *dev = rockchip->dev;
28 struct platform_device *pdev = to_platform_device(dev);
29 struct device_node *node = dev->of_node;
30 struct resource *regs;
31 int err;
32
33 if (rockchip->is_rc) {
34 regs = platform_get_resource_byname(pdev,
35 IORESOURCE_MEM,
36 "axi-base");
37 rockchip->reg_base = devm_pci_remap_cfg_resource(dev, regs);
38 if (IS_ERR(rockchip->reg_base))
39 return PTR_ERR(rockchip->reg_base);
40 } else {
41 rockchip->mem_res =
42 platform_get_resource_byname(pdev, IORESOURCE_MEM,
43 "mem-base");
44 if (!rockchip->mem_res)
45 return -EINVAL;
46 }
47
48 rockchip->apb_base =
49 devm_platform_ioremap_resource_byname(pdev, "apb-base");
50 if (IS_ERR(rockchip->apb_base))
51 return PTR_ERR(rockchip->apb_base);
52
53 err = rockchip_pcie_get_phys(rockchip);
54 if (err)
55 return err;
56
57 rockchip->lanes = 1;
58 err = of_property_read_u32(node, "num-lanes", &rockchip->lanes);
59 if (!err && (rockchip->lanes == 0 ||
60 rockchip->lanes == 3 ||
61 rockchip->lanes > 4)) {
62 dev_warn(dev, "invalid num-lanes, default to use one lane\n");
63 rockchip->lanes = 1;
64 }
65
66 rockchip->link_gen = of_pci_get_max_link_speed(node);
67 if (rockchip->link_gen < 0 || rockchip->link_gen > 2)
68 rockchip->link_gen = 2;
69
70 rockchip->core_rst = devm_reset_control_get_exclusive(dev, "core");
71 if (IS_ERR(rockchip->core_rst)) {
72 if (PTR_ERR(rockchip->core_rst) != -EPROBE_DEFER)
73 dev_err(dev, "missing core reset property in node\n");
74 return PTR_ERR(rockchip->core_rst);
75 }
76
77 rockchip->mgmt_rst = devm_reset_control_get_exclusive(dev, "mgmt");
78 if (IS_ERR(rockchip->mgmt_rst)) {
79 if (PTR_ERR(rockchip->mgmt_rst) != -EPROBE_DEFER)
80 dev_err(dev, "missing mgmt reset property in node\n");
81 return PTR_ERR(rockchip->mgmt_rst);
82 }
83
84 rockchip->mgmt_sticky_rst = devm_reset_control_get_exclusive(dev,
85 "mgmt-sticky");
86 if (IS_ERR(rockchip->mgmt_sticky_rst)) {
87 if (PTR_ERR(rockchip->mgmt_sticky_rst) != -EPROBE_DEFER)
88 dev_err(dev, "missing mgmt-sticky reset property in node\n");
89 return PTR_ERR(rockchip->mgmt_sticky_rst);
90 }
91
92 rockchip->pipe_rst = devm_reset_control_get_exclusive(dev, "pipe");
93 if (IS_ERR(rockchip->pipe_rst)) {
94 if (PTR_ERR(rockchip->pipe_rst) != -EPROBE_DEFER)
95 dev_err(dev, "missing pipe reset property in node\n");
96 return PTR_ERR(rockchip->pipe_rst);
97 }
98
99 rockchip->pm_rst = devm_reset_control_get_exclusive(dev, "pm");
100 if (IS_ERR(rockchip->pm_rst)) {
101 if (PTR_ERR(rockchip->pm_rst) != -EPROBE_DEFER)
102 dev_err(dev, "missing pm reset property in node\n");
103 return PTR_ERR(rockchip->pm_rst);
104 }
105
106 rockchip->pclk_rst = devm_reset_control_get_exclusive(dev, "pclk");
107 if (IS_ERR(rockchip->pclk_rst)) {
108 if (PTR_ERR(rockchip->pclk_rst) != -EPROBE_DEFER)
109 dev_err(dev, "missing pclk reset property in node\n");
110 return PTR_ERR(rockchip->pclk_rst);
111 }
112
113 rockchip->aclk_rst = devm_reset_control_get_exclusive(dev, "aclk");
114 if (IS_ERR(rockchip->aclk_rst)) {
115 if (PTR_ERR(rockchip->aclk_rst) != -EPROBE_DEFER)
116 dev_err(dev, "missing aclk reset property in node\n");
117 return PTR_ERR(rockchip->aclk_rst);
118 }
119
120 if (rockchip->is_rc) {
121 rockchip->ep_gpio = devm_gpiod_get_optional(dev, "ep",
122 GPIOD_OUT_HIGH);
123 if (IS_ERR(rockchip->ep_gpio))
124 return dev_err_probe(dev, PTR_ERR(rockchip->ep_gpio),
125 "failed to get ep GPIO\n");
126 }
127
128 rockchip->aclk_pcie = devm_clk_get(dev, "aclk");
129 if (IS_ERR(rockchip->aclk_pcie)) {
130 dev_err(dev, "aclk clock not found\n");
131 return PTR_ERR(rockchip->aclk_pcie);
132 }
133
134 rockchip->aclk_perf_pcie = devm_clk_get(dev, "aclk-perf");
135 if (IS_ERR(rockchip->aclk_perf_pcie)) {
136 dev_err(dev, "aclk_perf clock not found\n");
137 return PTR_ERR(rockchip->aclk_perf_pcie);
138 }
139
140 rockchip->hclk_pcie = devm_clk_get(dev, "hclk");
141 if (IS_ERR(rockchip->hclk_pcie)) {
142 dev_err(dev, "hclk clock not found\n");
143 return PTR_ERR(rockchip->hclk_pcie);
144 }
145
146 rockchip->clk_pcie_pm = devm_clk_get(dev, "pm");
147 if (IS_ERR(rockchip->clk_pcie_pm)) {
148 dev_err(dev, "pm clock not found\n");
149 return PTR_ERR(rockchip->clk_pcie_pm);
150 }
151
152 return 0;
153}
154EXPORT_SYMBOL_GPL(rockchip_pcie_parse_dt);
155
156int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
157{
158 struct device *dev = rockchip->dev;
159 int err, i;
160 u32 regs;
161
162 err = reset_control_assert(rockchip->aclk_rst);
163 if (err) {
164 dev_err(dev, "assert aclk_rst err %d\n", err);
165 return err;
166 }
167
168 err = reset_control_assert(rockchip->pclk_rst);
169 if (err) {
170 dev_err(dev, "assert pclk_rst err %d\n", err);
171 return err;
172 }
173
174 err = reset_control_assert(rockchip->pm_rst);
175 if (err) {
176 dev_err(dev, "assert pm_rst err %d\n", err);
177 return err;
178 }
179
180 for (i = 0; i < MAX_LANE_NUM; i++) {
181 err = phy_init(rockchip->phys[i]);
182 if (err) {
183 dev_err(dev, "init phy%d err %d\n", i, err);
184 goto err_exit_phy;
185 }
186 }
187
188 err = reset_control_assert(rockchip->core_rst);
189 if (err) {
190 dev_err(dev, "assert core_rst err %d\n", err);
191 goto err_exit_phy;
192 }
193
194 err = reset_control_assert(rockchip->mgmt_rst);
195 if (err) {
196 dev_err(dev, "assert mgmt_rst err %d\n", err);
197 goto err_exit_phy;
198 }
199
200 err = reset_control_assert(rockchip->mgmt_sticky_rst);
201 if (err) {
202 dev_err(dev, "assert mgmt_sticky_rst err %d\n", err);
203 goto err_exit_phy;
204 }
205
206 err = reset_control_assert(rockchip->pipe_rst);
207 if (err) {
208 dev_err(dev, "assert pipe_rst err %d\n", err);
209 goto err_exit_phy;
210 }
211
212 udelay(10);
213
214 err = reset_control_deassert(rockchip->pm_rst);
215 if (err) {
216 dev_err(dev, "deassert pm_rst err %d\n", err);
217 goto err_exit_phy;
218 }
219
220 err = reset_control_deassert(rockchip->aclk_rst);
221 if (err) {
222 dev_err(dev, "deassert aclk_rst err %d\n", err);
223 goto err_exit_phy;
224 }
225
226 err = reset_control_deassert(rockchip->pclk_rst);
227 if (err) {
228 dev_err(dev, "deassert pclk_rst err %d\n", err);
229 goto err_exit_phy;
230 }
231
232 if (rockchip->link_gen == 2)
233 rockchip_pcie_write(rockchip, PCIE_CLIENT_GEN_SEL_2,
234 PCIE_CLIENT_CONFIG);
235 else
236 rockchip_pcie_write(rockchip, PCIE_CLIENT_GEN_SEL_1,
237 PCIE_CLIENT_CONFIG);
238
239 regs = PCIE_CLIENT_LINK_TRAIN_ENABLE | PCIE_CLIENT_ARI_ENABLE |
240 PCIE_CLIENT_CONF_LANE_NUM(rockchip->lanes);
241
242 if (rockchip->is_rc)
243 regs |= PCIE_CLIENT_CONF_ENABLE | PCIE_CLIENT_MODE_RC;
244 else
245 regs |= PCIE_CLIENT_CONF_DISABLE | PCIE_CLIENT_MODE_EP;
246
247 rockchip_pcie_write(rockchip, regs, PCIE_CLIENT_CONFIG);
248
249 for (i = 0; i < MAX_LANE_NUM; i++) {
250 err = phy_power_on(rockchip->phys[i]);
251 if (err) {
252 dev_err(dev, "power on phy%d err %d\n", i, err);
253 goto err_power_off_phy;
254 }
255 }
256
257 /*
258 * Please don't reorder the deassert sequence of the following
259 * four reset pins.
260 */
261 err = reset_control_deassert(rockchip->mgmt_sticky_rst);
262 if (err) {
263 dev_err(dev, "deassert mgmt_sticky_rst err %d\n", err);
264 goto err_power_off_phy;
265 }
266
267 err = reset_control_deassert(rockchip->core_rst);
268 if (err) {
269 dev_err(dev, "deassert core_rst err %d\n", err);
270 goto err_power_off_phy;
271 }
272
273 err = reset_control_deassert(rockchip->mgmt_rst);
274 if (err) {
275 dev_err(dev, "deassert mgmt_rst err %d\n", err);
276 goto err_power_off_phy;
277 }
278
279 err = reset_control_deassert(rockchip->pipe_rst);
280 if (err) {
281 dev_err(dev, "deassert pipe_rst err %d\n", err);
282 goto err_power_off_phy;
283 }
284
285 return 0;
286err_power_off_phy:
287 while (i--)
288 phy_power_off(rockchip->phys[i]);
289 i = MAX_LANE_NUM;
290err_exit_phy:
291 while (i--)
292 phy_exit(rockchip->phys[i]);
293 return err;
294}
295EXPORT_SYMBOL_GPL(rockchip_pcie_init_port);
296
297int rockchip_pcie_get_phys(struct rockchip_pcie *rockchip)
298{
299 struct device *dev = rockchip->dev;
300 struct phy *phy;
301 char *name;
302 u32 i;
303
304 phy = devm_phy_get(dev, "pcie-phy");
305 if (!IS_ERR(phy)) {
306 rockchip->legacy_phy = true;
307 rockchip->phys[0] = phy;
308 dev_warn(dev, "legacy phy model is deprecated!\n");
309 return 0;
310 }
311
312 if (PTR_ERR(phy) == -EPROBE_DEFER)
313 return PTR_ERR(phy);
314
315 dev_dbg(dev, "missing legacy phy; search for per-lane PHY\n");
316
317 for (i = 0; i < MAX_LANE_NUM; i++) {
318 name = kasprintf(GFP_KERNEL, "pcie-phy-%u", i);
319 if (!name)
320 return -ENOMEM;
321
322 phy = devm_of_phy_get(dev, dev->of_node, name);
323 kfree(name);
324
325 if (IS_ERR(phy)) {
326 if (PTR_ERR(phy) != -EPROBE_DEFER)
327 dev_err(dev, "missing phy for lane %d: %ld\n",
328 i, PTR_ERR(phy));
329 return PTR_ERR(phy);
330 }
331
332 rockchip->phys[i] = phy;
333 }
334
335 return 0;
336}
337EXPORT_SYMBOL_GPL(rockchip_pcie_get_phys);
338
339void rockchip_pcie_deinit_phys(struct rockchip_pcie *rockchip)
340{
341 int i;
342
343 for (i = 0; i < MAX_LANE_NUM; i++) {
344 /* inactive lanes are already powered off */
345 if (rockchip->lanes_map & BIT(i))
346 phy_power_off(rockchip->phys[i]);
347 phy_exit(rockchip->phys[i]);
348 }
349}
350EXPORT_SYMBOL_GPL(rockchip_pcie_deinit_phys);
351
352int rockchip_pcie_enable_clocks(struct rockchip_pcie *rockchip)
353{
354 struct device *dev = rockchip->dev;
355 int err;
356
357 err = clk_prepare_enable(rockchip->aclk_pcie);
358 if (err) {
359 dev_err(dev, "unable to enable aclk_pcie clock\n");
360 return err;
361 }
362
363 err = clk_prepare_enable(rockchip->aclk_perf_pcie);
364 if (err) {
365 dev_err(dev, "unable to enable aclk_perf_pcie clock\n");
366 goto err_aclk_perf_pcie;
367 }
368
369 err = clk_prepare_enable(rockchip->hclk_pcie);
370 if (err) {
371 dev_err(dev, "unable to enable hclk_pcie clock\n");
372 goto err_hclk_pcie;
373 }
374
375 err = clk_prepare_enable(rockchip->clk_pcie_pm);
376 if (err) {
377 dev_err(dev, "unable to enable clk_pcie_pm clock\n");
378 goto err_clk_pcie_pm;
379 }
380
381 return 0;
382
383err_clk_pcie_pm:
384 clk_disable_unprepare(rockchip->hclk_pcie);
385err_hclk_pcie:
386 clk_disable_unprepare(rockchip->aclk_perf_pcie);
387err_aclk_perf_pcie:
388 clk_disable_unprepare(rockchip->aclk_pcie);
389 return err;
390}
391EXPORT_SYMBOL_GPL(rockchip_pcie_enable_clocks);
392
393void rockchip_pcie_disable_clocks(void *data)
394{
395 struct rockchip_pcie *rockchip = data;
396
397 clk_disable_unprepare(rockchip->clk_pcie_pm);
398 clk_disable_unprepare(rockchip->hclk_pcie);
399 clk_disable_unprepare(rockchip->aclk_perf_pcie);
400 clk_disable_unprepare(rockchip->aclk_pcie);
401}
402EXPORT_SYMBOL_GPL(rockchip_pcie_disable_clocks);
403
404void rockchip_pcie_cfg_configuration_accesses(
405 struct rockchip_pcie *rockchip, u32 type)
406{
407 u32 ob_desc_0;
408
409 /* Configuration Accesses for region 0 */
410 rockchip_pcie_write(rockchip, 0x0, PCIE_RC_BAR_CONF);
411
412 rockchip_pcie_write(rockchip,
413 (RC_REGION_0_ADDR_TRANS_L + RC_REGION_0_PASS_BITS),
414 PCIE_CORE_OB_REGION_ADDR0);
415 rockchip_pcie_write(rockchip, RC_REGION_0_ADDR_TRANS_H,
416 PCIE_CORE_OB_REGION_ADDR1);
417 ob_desc_0 = rockchip_pcie_read(rockchip, PCIE_CORE_OB_REGION_DESC0);
418 ob_desc_0 &= ~(RC_REGION_0_TYPE_MASK);
419 ob_desc_0 |= (type | (0x1 << 23));
420 rockchip_pcie_write(rockchip, ob_desc_0, PCIE_CORE_OB_REGION_DESC0);
421 rockchip_pcie_write(rockchip, 0x0, PCIE_CORE_OB_REGION_DESC1);
422}
423EXPORT_SYMBOL_GPL(rockchip_pcie_cfg_configuration_accesses);