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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 regs = platform_get_resource_byname(pdev, IORESOURCE_MEM,
49 "apb-base");
50 rockchip->apb_base = devm_ioremap_resource(dev, regs);
51 if (IS_ERR(rockchip->apb_base))
52 return PTR_ERR(rockchip->apb_base);
53
54 err = rockchip_pcie_get_phys(rockchip);
55 if (err)
56 return err;
57
58 rockchip->lanes = 1;
59 err = of_property_read_u32(node, "num-lanes", &rockchip->lanes);
60 if (!err && (rockchip->lanes == 0 ||
61 rockchip->lanes == 3 ||
62 rockchip->lanes > 4)) {
63 dev_warn(dev, "invalid num-lanes, default to use one lane\n");
64 rockchip->lanes = 1;
65 }
66
67 rockchip->link_gen = of_pci_get_max_link_speed(node);
68 if (rockchip->link_gen < 0 || rockchip->link_gen > 2)
69 rockchip->link_gen = 2;
70
71 rockchip->core_rst = devm_reset_control_get_exclusive(dev, "core");
72 if (IS_ERR(rockchip->core_rst)) {
73 if (PTR_ERR(rockchip->core_rst) != -EPROBE_DEFER)
74 dev_err(dev, "missing core reset property in node\n");
75 return PTR_ERR(rockchip->core_rst);
76 }
77
78 rockchip->mgmt_rst = devm_reset_control_get_exclusive(dev, "mgmt");
79 if (IS_ERR(rockchip->mgmt_rst)) {
80 if (PTR_ERR(rockchip->mgmt_rst) != -EPROBE_DEFER)
81 dev_err(dev, "missing mgmt reset property in node\n");
82 return PTR_ERR(rockchip->mgmt_rst);
83 }
84
85 rockchip->mgmt_sticky_rst = devm_reset_control_get_exclusive(dev,
86 "mgmt-sticky");
87 if (IS_ERR(rockchip->mgmt_sticky_rst)) {
88 if (PTR_ERR(rockchip->mgmt_sticky_rst) != -EPROBE_DEFER)
89 dev_err(dev, "missing mgmt-sticky reset property in node\n");
90 return PTR_ERR(rockchip->mgmt_sticky_rst);
91 }
92
93 rockchip->pipe_rst = devm_reset_control_get_exclusive(dev, "pipe");
94 if (IS_ERR(rockchip->pipe_rst)) {
95 if (PTR_ERR(rockchip->pipe_rst) != -EPROBE_DEFER)
96 dev_err(dev, "missing pipe reset property in node\n");
97 return PTR_ERR(rockchip->pipe_rst);
98 }
99
100 rockchip->pm_rst = devm_reset_control_get_exclusive(dev, "pm");
101 if (IS_ERR(rockchip->pm_rst)) {
102 if (PTR_ERR(rockchip->pm_rst) != -EPROBE_DEFER)
103 dev_err(dev, "missing pm reset property in node\n");
104 return PTR_ERR(rockchip->pm_rst);
105 }
106
107 rockchip->pclk_rst = devm_reset_control_get_exclusive(dev, "pclk");
108 if (IS_ERR(rockchip->pclk_rst)) {
109 if (PTR_ERR(rockchip->pclk_rst) != -EPROBE_DEFER)
110 dev_err(dev, "missing pclk reset property in node\n");
111 return PTR_ERR(rockchip->pclk_rst);
112 }
113
114 rockchip->aclk_rst = devm_reset_control_get_exclusive(dev, "aclk");
115 if (IS_ERR(rockchip->aclk_rst)) {
116 if (PTR_ERR(rockchip->aclk_rst) != -EPROBE_DEFER)
117 dev_err(dev, "missing aclk reset property in node\n");
118 return PTR_ERR(rockchip->aclk_rst);
119 }
120
121 if (rockchip->is_rc) {
122 rockchip->ep_gpio = devm_gpiod_get(dev, "ep", GPIOD_OUT_HIGH);
123 if (IS_ERR(rockchip->ep_gpio)) {
124 dev_err(dev, "missing ep-gpios property in node\n");
125 return PTR_ERR(rockchip->ep_gpio);
126 }
127 }
128
129 rockchip->aclk_pcie = devm_clk_get(dev, "aclk");
130 if (IS_ERR(rockchip->aclk_pcie)) {
131 dev_err(dev, "aclk clock not found\n");
132 return PTR_ERR(rockchip->aclk_pcie);
133 }
134
135 rockchip->aclk_perf_pcie = devm_clk_get(dev, "aclk-perf");
136 if (IS_ERR(rockchip->aclk_perf_pcie)) {
137 dev_err(dev, "aclk_perf clock not found\n");
138 return PTR_ERR(rockchip->aclk_perf_pcie);
139 }
140
141 rockchip->hclk_pcie = devm_clk_get(dev, "hclk");
142 if (IS_ERR(rockchip->hclk_pcie)) {
143 dev_err(dev, "hclk clock not found\n");
144 return PTR_ERR(rockchip->hclk_pcie);
145 }
146
147 rockchip->clk_pcie_pm = devm_clk_get(dev, "pm");
148 if (IS_ERR(rockchip->clk_pcie_pm)) {
149 dev_err(dev, "pm clock not found\n");
150 return PTR_ERR(rockchip->clk_pcie_pm);
151 }
152
153 return 0;
154}
155EXPORT_SYMBOL_GPL(rockchip_pcie_parse_dt);
156
157int rockchip_pcie_init_port(struct rockchip_pcie *rockchip)
158{
159 struct device *dev = rockchip->dev;
160 int err, i;
161 u32 regs;
162
163 err = reset_control_assert(rockchip->aclk_rst);
164 if (err) {
165 dev_err(dev, "assert aclk_rst err %d\n", err);
166 return err;
167 }
168
169 err = reset_control_assert(rockchip->pclk_rst);
170 if (err) {
171 dev_err(dev, "assert pclk_rst err %d\n", err);
172 return err;
173 }
174
175 err = reset_control_assert(rockchip->pm_rst);
176 if (err) {
177 dev_err(dev, "assert pm_rst err %d\n", err);
178 return err;
179 }
180
181 for (i = 0; i < MAX_LANE_NUM; i++) {
182 err = phy_init(rockchip->phys[i]);
183 if (err) {
184 dev_err(dev, "init phy%d err %d\n", i, err);
185 goto err_exit_phy;
186 }
187 }
188
189 err = reset_control_assert(rockchip->core_rst);
190 if (err) {
191 dev_err(dev, "assert core_rst err %d\n", err);
192 goto err_exit_phy;
193 }
194
195 err = reset_control_assert(rockchip->mgmt_rst);
196 if (err) {
197 dev_err(dev, "assert mgmt_rst err %d\n", err);
198 goto err_exit_phy;
199 }
200
201 err = reset_control_assert(rockchip->mgmt_sticky_rst);
202 if (err) {
203 dev_err(dev, "assert mgmt_sticky_rst err %d\n", err);
204 goto err_exit_phy;
205 }
206
207 err = reset_control_assert(rockchip->pipe_rst);
208 if (err) {
209 dev_err(dev, "assert pipe_rst err %d\n", err);
210 goto err_exit_phy;
211 }
212
213 udelay(10);
214
215 err = reset_control_deassert(rockchip->pm_rst);
216 if (err) {
217 dev_err(dev, "deassert pm_rst err %d\n", err);
218 goto err_exit_phy;
219 }
220
221 err = reset_control_deassert(rockchip->aclk_rst);
222 if (err) {
223 dev_err(dev, "deassert aclk_rst err %d\n", err);
224 goto err_exit_phy;
225 }
226
227 err = reset_control_deassert(rockchip->pclk_rst);
228 if (err) {
229 dev_err(dev, "deassert pclk_rst err %d\n", err);
230 goto err_exit_phy;
231 }
232
233 if (rockchip->link_gen == 2)
234 rockchip_pcie_write(rockchip, PCIE_CLIENT_GEN_SEL_2,
235 PCIE_CLIENT_CONFIG);
236 else
237 rockchip_pcie_write(rockchip, PCIE_CLIENT_GEN_SEL_1,
238 PCIE_CLIENT_CONFIG);
239
240 regs = PCIE_CLIENT_LINK_TRAIN_ENABLE | PCIE_CLIENT_ARI_ENABLE |
241 PCIE_CLIENT_CONF_LANE_NUM(rockchip->lanes);
242
243 if (rockchip->is_rc)
244 regs |= PCIE_CLIENT_CONF_ENABLE | PCIE_CLIENT_MODE_RC;
245 else
246 regs |= PCIE_CLIENT_CONF_DISABLE | PCIE_CLIENT_MODE_EP;
247
248 rockchip_pcie_write(rockchip, regs, PCIE_CLIENT_CONFIG);
249
250 for (i = 0; i < MAX_LANE_NUM; i++) {
251 err = phy_power_on(rockchip->phys[i]);
252 if (err) {
253 dev_err(dev, "power on phy%d err %d\n", i, err);
254 goto err_power_off_phy;
255 }
256 }
257
258 /*
259 * Please don't reorder the deassert sequence of the following
260 * four reset pins.
261 */
262 err = reset_control_deassert(rockchip->mgmt_sticky_rst);
263 if (err) {
264 dev_err(dev, "deassert mgmt_sticky_rst err %d\n", err);
265 goto err_power_off_phy;
266 }
267
268 err = reset_control_deassert(rockchip->core_rst);
269 if (err) {
270 dev_err(dev, "deassert core_rst err %d\n", err);
271 goto err_power_off_phy;
272 }
273
274 err = reset_control_deassert(rockchip->mgmt_rst);
275 if (err) {
276 dev_err(dev, "deassert mgmt_rst err %d\n", err);
277 goto err_power_off_phy;
278 }
279
280 err = reset_control_deassert(rockchip->pipe_rst);
281 if (err) {
282 dev_err(dev, "deassert pipe_rst err %d\n", err);
283 goto err_power_off_phy;
284 }
285
286 return 0;
287err_power_off_phy:
288 while (i--)
289 phy_power_off(rockchip->phys[i]);
290 i = MAX_LANE_NUM;
291err_exit_phy:
292 while (i--)
293 phy_exit(rockchip->phys[i]);
294 return err;
295}
296EXPORT_SYMBOL_GPL(rockchip_pcie_init_port);
297
298int rockchip_pcie_get_phys(struct rockchip_pcie *rockchip)
299{
300 struct device *dev = rockchip->dev;
301 struct phy *phy;
302 char *name;
303 u32 i;
304
305 phy = devm_phy_get(dev, "pcie-phy");
306 if (!IS_ERR(phy)) {
307 rockchip->legacy_phy = true;
308 rockchip->phys[0] = phy;
309 dev_warn(dev, "legacy phy model is deprecated!\n");
310 return 0;
311 }
312
313 if (PTR_ERR(phy) == -EPROBE_DEFER)
314 return PTR_ERR(phy);
315
316 dev_dbg(dev, "missing legacy phy; search for per-lane PHY\n");
317
318 for (i = 0; i < MAX_LANE_NUM; i++) {
319 name = kasprintf(GFP_KERNEL, "pcie-phy-%u", i);
320 if (!name)
321 return -ENOMEM;
322
323 phy = devm_of_phy_get(dev, dev->of_node, name);
324 kfree(name);
325
326 if (IS_ERR(phy)) {
327 if (PTR_ERR(phy) != -EPROBE_DEFER)
328 dev_err(dev, "missing phy for lane %d: %ld\n",
329 i, PTR_ERR(phy));
330 return PTR_ERR(phy);
331 }
332
333 rockchip->phys[i] = phy;
334 }
335
336 return 0;
337}
338EXPORT_SYMBOL_GPL(rockchip_pcie_get_phys);
339
340void rockchip_pcie_deinit_phys(struct rockchip_pcie *rockchip)
341{
342 int i;
343
344 for (i = 0; i < MAX_LANE_NUM; i++) {
345 /* inactive lanes are already powered off */
346 if (rockchip->lanes_map & BIT(i))
347 phy_power_off(rockchip->phys[i]);
348 phy_exit(rockchip->phys[i]);
349 }
350}
351EXPORT_SYMBOL_GPL(rockchip_pcie_deinit_phys);
352
353int rockchip_pcie_enable_clocks(struct rockchip_pcie *rockchip)
354{
355 struct device *dev = rockchip->dev;
356 int err;
357
358 err = clk_prepare_enable(rockchip->aclk_pcie);
359 if (err) {
360 dev_err(dev, "unable to enable aclk_pcie clock\n");
361 return err;
362 }
363
364 err = clk_prepare_enable(rockchip->aclk_perf_pcie);
365 if (err) {
366 dev_err(dev, "unable to enable aclk_perf_pcie clock\n");
367 goto err_aclk_perf_pcie;
368 }
369
370 err = clk_prepare_enable(rockchip->hclk_pcie);
371 if (err) {
372 dev_err(dev, "unable to enable hclk_pcie clock\n");
373 goto err_hclk_pcie;
374 }
375
376 err = clk_prepare_enable(rockchip->clk_pcie_pm);
377 if (err) {
378 dev_err(dev, "unable to enable clk_pcie_pm clock\n");
379 goto err_clk_pcie_pm;
380 }
381
382 return 0;
383
384err_clk_pcie_pm:
385 clk_disable_unprepare(rockchip->hclk_pcie);
386err_hclk_pcie:
387 clk_disable_unprepare(rockchip->aclk_perf_pcie);
388err_aclk_perf_pcie:
389 clk_disable_unprepare(rockchip->aclk_pcie);
390 return err;
391}
392EXPORT_SYMBOL_GPL(rockchip_pcie_enable_clocks);
393
394void rockchip_pcie_disable_clocks(void *data)
395{
396 struct rockchip_pcie *rockchip = data;
397
398 clk_disable_unprepare(rockchip->clk_pcie_pm);
399 clk_disable_unprepare(rockchip->hclk_pcie);
400 clk_disable_unprepare(rockchip->aclk_perf_pcie);
401 clk_disable_unprepare(rockchip->aclk_pcie);
402}
403EXPORT_SYMBOL_GPL(rockchip_pcie_disable_clocks);
404
405void rockchip_pcie_cfg_configuration_accesses(
406 struct rockchip_pcie *rockchip, u32 type)
407{
408 u32 ob_desc_0;
409
410 /* Configuration Accesses for region 0 */
411 rockchip_pcie_write(rockchip, 0x0, PCIE_RC_BAR_CONF);
412
413 rockchip_pcie_write(rockchip,
414 (RC_REGION_0_ADDR_TRANS_L + RC_REGION_0_PASS_BITS),
415 PCIE_CORE_OB_REGION_ADDR0);
416 rockchip_pcie_write(rockchip, RC_REGION_0_ADDR_TRANS_H,
417 PCIE_CORE_OB_REGION_ADDR1);
418 ob_desc_0 = rockchip_pcie_read(rockchip, PCIE_CORE_OB_REGION_DESC0);
419 ob_desc_0 &= ~(RC_REGION_0_TYPE_MASK);
420 ob_desc_0 |= (type | (0x1 << 23));
421 rockchip_pcie_write(rockchip, ob_desc_0, PCIE_CORE_OB_REGION_DESC0);
422 rockchip_pcie_write(rockchip, 0x0, PCIE_CORE_OB_REGION_DESC1);
423}
424EXPORT_SYMBOL_GPL(rockchip_pcie_cfg_configuration_accesses);