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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2017, Impinj, Inc.
4 *
5 * i.MX7 System Reset Controller (SRC) driver
6 *
7 * Author: Andrey Smirnov <andrew.smirnov@gmail.com>
8 */
9
10#include <linux/mfd/syscon.h>
11#include <linux/module.h>
12#include <linux/of.h>
13#include <linux/platform_device.h>
14#include <linux/reset-controller.h>
15#include <linux/regmap.h>
16#include <dt-bindings/reset/imx7-reset.h>
17#include <dt-bindings/reset/imx8mq-reset.h>
18#include <dt-bindings/reset/imx8mp-reset.h>
19
20struct imx7_src_signal {
21 unsigned int offset, bit;
22};
23
24struct imx7_src_variant {
25 const struct imx7_src_signal *signals;
26 unsigned int signals_num;
27 struct reset_control_ops ops;
28};
29
30struct imx7_src {
31 struct reset_controller_dev rcdev;
32 struct regmap *regmap;
33 const struct imx7_src_signal *signals;
34};
35
36enum imx7_src_registers {
37 SRC_A7RCR0 = 0x0004,
38 SRC_M4RCR = 0x000c,
39 SRC_ERCR = 0x0014,
40 SRC_HSICPHY_RCR = 0x001c,
41 SRC_USBOPHY1_RCR = 0x0020,
42 SRC_USBOPHY2_RCR = 0x0024,
43 SRC_MIPIPHY_RCR = 0x0028,
44 SRC_PCIEPHY_RCR = 0x002c,
45 SRC_DDRC_RCR = 0x1000,
46};
47
48static int imx7_reset_update(struct imx7_src *imx7src,
49 unsigned long id, unsigned int value)
50{
51 const struct imx7_src_signal *signal = &imx7src->signals[id];
52
53 return regmap_update_bits(imx7src->regmap,
54 signal->offset, signal->bit, value);
55}
56
57static const struct imx7_src_signal imx7_src_signals[IMX7_RESET_NUM] = {
58 [IMX7_RESET_A7_CORE_POR_RESET0] = { SRC_A7RCR0, BIT(0) },
59 [IMX7_RESET_A7_CORE_POR_RESET1] = { SRC_A7RCR0, BIT(1) },
60 [IMX7_RESET_A7_CORE_RESET0] = { SRC_A7RCR0, BIT(4) },
61 [IMX7_RESET_A7_CORE_RESET1] = { SRC_A7RCR0, BIT(5) },
62 [IMX7_RESET_A7_DBG_RESET0] = { SRC_A7RCR0, BIT(8) },
63 [IMX7_RESET_A7_DBG_RESET1] = { SRC_A7RCR0, BIT(9) },
64 [IMX7_RESET_A7_ETM_RESET0] = { SRC_A7RCR0, BIT(12) },
65 [IMX7_RESET_A7_ETM_RESET1] = { SRC_A7RCR0, BIT(13) },
66 [IMX7_RESET_A7_SOC_DBG_RESET] = { SRC_A7RCR0, BIT(20) },
67 [IMX7_RESET_A7_L2RESET] = { SRC_A7RCR0, BIT(21) },
68 [IMX7_RESET_SW_M4C_RST] = { SRC_M4RCR, BIT(1) },
69 [IMX7_RESET_SW_M4P_RST] = { SRC_M4RCR, BIT(2) },
70 [IMX7_RESET_EIM_RST] = { SRC_ERCR, BIT(0) },
71 [IMX7_RESET_HSICPHY_PORT_RST] = { SRC_HSICPHY_RCR, BIT(1) },
72 [IMX7_RESET_USBPHY1_POR] = { SRC_USBOPHY1_RCR, BIT(0) },
73 [IMX7_RESET_USBPHY1_PORT_RST] = { SRC_USBOPHY1_RCR, BIT(1) },
74 [IMX7_RESET_USBPHY2_POR] = { SRC_USBOPHY2_RCR, BIT(0) },
75 [IMX7_RESET_USBPHY2_PORT_RST] = { SRC_USBOPHY2_RCR, BIT(1) },
76 [IMX7_RESET_MIPI_PHY_MRST] = { SRC_MIPIPHY_RCR, BIT(1) },
77 [IMX7_RESET_MIPI_PHY_SRST] = { SRC_MIPIPHY_RCR, BIT(2) },
78 [IMX7_RESET_PCIEPHY] = { SRC_PCIEPHY_RCR, BIT(2) | BIT(1) },
79 [IMX7_RESET_PCIEPHY_PERST] = { SRC_PCIEPHY_RCR, BIT(3) },
80 [IMX7_RESET_PCIE_CTRL_APPS_EN] = { SRC_PCIEPHY_RCR, BIT(6) },
81 [IMX7_RESET_PCIE_CTRL_APPS_TURNOFF] = { SRC_PCIEPHY_RCR, BIT(11) },
82 [IMX7_RESET_DDRC_PRST] = { SRC_DDRC_RCR, BIT(0) },
83 [IMX7_RESET_DDRC_CORE_RST] = { SRC_DDRC_RCR, BIT(1) },
84};
85
86static struct imx7_src *to_imx7_src(struct reset_controller_dev *rcdev)
87{
88 return container_of(rcdev, struct imx7_src, rcdev);
89}
90
91static int imx7_reset_set(struct reset_controller_dev *rcdev,
92 unsigned long id, bool assert)
93{
94 struct imx7_src *imx7src = to_imx7_src(rcdev);
95 const unsigned int bit = imx7src->signals[id].bit;
96 unsigned int value = assert ? bit : 0;
97
98 switch (id) {
99 case IMX7_RESET_PCIEPHY:
100 /*
101 * wait for more than 10us to release phy g_rst and
102 * btnrst
103 */
104 if (!assert)
105 udelay(10);
106 break;
107
108 case IMX7_RESET_PCIE_CTRL_APPS_EN:
109 value = assert ? 0 : bit;
110 break;
111 }
112
113 return imx7_reset_update(imx7src, id, value);
114}
115
116static int imx7_reset_assert(struct reset_controller_dev *rcdev,
117 unsigned long id)
118{
119 return imx7_reset_set(rcdev, id, true);
120}
121
122static int imx7_reset_deassert(struct reset_controller_dev *rcdev,
123 unsigned long id)
124{
125 return imx7_reset_set(rcdev, id, false);
126}
127
128static const struct imx7_src_variant variant_imx7 = {
129 .signals = imx7_src_signals,
130 .signals_num = ARRAY_SIZE(imx7_src_signals),
131 .ops = {
132 .assert = imx7_reset_assert,
133 .deassert = imx7_reset_deassert,
134 },
135};
136
137enum imx8mq_src_registers {
138 SRC_A53RCR0 = 0x0004,
139 SRC_HDMI_RCR = 0x0030,
140 SRC_DISP_RCR = 0x0034,
141 SRC_GPU_RCR = 0x0040,
142 SRC_VPU_RCR = 0x0044,
143 SRC_PCIE2_RCR = 0x0048,
144 SRC_MIPIPHY1_RCR = 0x004c,
145 SRC_MIPIPHY2_RCR = 0x0050,
146 SRC_DDRC2_RCR = 0x1004,
147};
148
149enum imx8mp_src_registers {
150 SRC_SUPERMIX_RCR = 0x0018,
151 SRC_AUDIOMIX_RCR = 0x001c,
152 SRC_MLMIX_RCR = 0x0028,
153 SRC_GPU2D_RCR = 0x0038,
154 SRC_GPU3D_RCR = 0x003c,
155 SRC_VPU_G1_RCR = 0x0048,
156 SRC_VPU_G2_RCR = 0x004c,
157 SRC_VPUVC8KE_RCR = 0x0050,
158 SRC_NOC_RCR = 0x0054,
159};
160
161static const struct imx7_src_signal imx8mq_src_signals[IMX8MQ_RESET_NUM] = {
162 [IMX8MQ_RESET_A53_CORE_POR_RESET0] = { SRC_A53RCR0, BIT(0) },
163 [IMX8MQ_RESET_A53_CORE_POR_RESET1] = { SRC_A53RCR0, BIT(1) },
164 [IMX8MQ_RESET_A53_CORE_POR_RESET2] = { SRC_A53RCR0, BIT(2) },
165 [IMX8MQ_RESET_A53_CORE_POR_RESET3] = { SRC_A53RCR0, BIT(3) },
166 [IMX8MQ_RESET_A53_CORE_RESET0] = { SRC_A53RCR0, BIT(4) },
167 [IMX8MQ_RESET_A53_CORE_RESET1] = { SRC_A53RCR0, BIT(5) },
168 [IMX8MQ_RESET_A53_CORE_RESET2] = { SRC_A53RCR0, BIT(6) },
169 [IMX8MQ_RESET_A53_CORE_RESET3] = { SRC_A53RCR0, BIT(7) },
170 [IMX8MQ_RESET_A53_DBG_RESET0] = { SRC_A53RCR0, BIT(8) },
171 [IMX8MQ_RESET_A53_DBG_RESET1] = { SRC_A53RCR0, BIT(9) },
172 [IMX8MQ_RESET_A53_DBG_RESET2] = { SRC_A53RCR0, BIT(10) },
173 [IMX8MQ_RESET_A53_DBG_RESET3] = { SRC_A53RCR0, BIT(11) },
174 [IMX8MQ_RESET_A53_ETM_RESET0] = { SRC_A53RCR0, BIT(12) },
175 [IMX8MQ_RESET_A53_ETM_RESET1] = { SRC_A53RCR0, BIT(13) },
176 [IMX8MQ_RESET_A53_ETM_RESET2] = { SRC_A53RCR0, BIT(14) },
177 [IMX8MQ_RESET_A53_ETM_RESET3] = { SRC_A53RCR0, BIT(15) },
178 [IMX8MQ_RESET_A53_SOC_DBG_RESET] = { SRC_A53RCR0, BIT(20) },
179 [IMX8MQ_RESET_A53_L2RESET] = { SRC_A53RCR0, BIT(21) },
180 [IMX8MQ_RESET_SW_NON_SCLR_M4C_RST] = { SRC_M4RCR, BIT(0) },
181 [IMX8MQ_RESET_SW_M4C_RST] = { SRC_M4RCR, BIT(1) },
182 [IMX8MQ_RESET_SW_M4P_RST] = { SRC_M4RCR, BIT(2) },
183 [IMX8MQ_RESET_M4_ENABLE] = { SRC_M4RCR, BIT(3) },
184 [IMX8MQ_RESET_OTG1_PHY_RESET] = { SRC_USBOPHY1_RCR, BIT(0) },
185 [IMX8MQ_RESET_OTG2_PHY_RESET] = { SRC_USBOPHY2_RCR, BIT(0) },
186 [IMX8MQ_RESET_MIPI_DSI_RESET_BYTE_N] = { SRC_MIPIPHY_RCR, BIT(1) },
187 [IMX8MQ_RESET_MIPI_DSI_RESET_N] = { SRC_MIPIPHY_RCR, BIT(2) },
188 [IMX8MQ_RESET_MIPI_DSI_DPI_RESET_N] = { SRC_MIPIPHY_RCR, BIT(3) },
189 [IMX8MQ_RESET_MIPI_DSI_ESC_RESET_N] = { SRC_MIPIPHY_RCR, BIT(4) },
190 [IMX8MQ_RESET_MIPI_DSI_PCLK_RESET_N] = { SRC_MIPIPHY_RCR, BIT(5) },
191 [IMX8MQ_RESET_PCIEPHY] = { SRC_PCIEPHY_RCR,
192 BIT(2) | BIT(1) },
193 [IMX8MQ_RESET_PCIEPHY_PERST] = { SRC_PCIEPHY_RCR, BIT(3) },
194 [IMX8MQ_RESET_PCIE_CTRL_APPS_EN] = { SRC_PCIEPHY_RCR, BIT(6) },
195 [IMX8MQ_RESET_PCIE_CTRL_APPS_TURNOFF] = { SRC_PCIEPHY_RCR, BIT(11) },
196 [IMX8MQ_RESET_HDMI_PHY_APB_RESET] = { SRC_HDMI_RCR, BIT(0) },
197 [IMX8MQ_RESET_DISP_RESET] = { SRC_DISP_RCR, BIT(0) },
198 [IMX8MQ_RESET_GPU_RESET] = { SRC_GPU_RCR, BIT(0) },
199 [IMX8MQ_RESET_VPU_RESET] = { SRC_VPU_RCR, BIT(0) },
200 [IMX8MQ_RESET_PCIEPHY2] = { SRC_PCIE2_RCR,
201 BIT(2) | BIT(1) },
202 [IMX8MQ_RESET_PCIEPHY2_PERST] = { SRC_PCIE2_RCR, BIT(3) },
203 [IMX8MQ_RESET_PCIE2_CTRL_APPS_EN] = { SRC_PCIE2_RCR, BIT(6) },
204 [IMX8MQ_RESET_PCIE2_CTRL_APPS_TURNOFF] = { SRC_PCIE2_RCR, BIT(11) },
205 [IMX8MQ_RESET_MIPI_CSI1_CORE_RESET] = { SRC_MIPIPHY1_RCR, BIT(0) },
206 [IMX8MQ_RESET_MIPI_CSI1_PHY_REF_RESET] = { SRC_MIPIPHY1_RCR, BIT(1) },
207 [IMX8MQ_RESET_MIPI_CSI1_ESC_RESET] = { SRC_MIPIPHY1_RCR, BIT(2) },
208 [IMX8MQ_RESET_MIPI_CSI2_CORE_RESET] = { SRC_MIPIPHY2_RCR, BIT(0) },
209 [IMX8MQ_RESET_MIPI_CSI2_PHY_REF_RESET] = { SRC_MIPIPHY2_RCR, BIT(1) },
210 [IMX8MQ_RESET_MIPI_CSI2_ESC_RESET] = { SRC_MIPIPHY2_RCR, BIT(2) },
211 [IMX8MQ_RESET_DDRC1_PRST] = { SRC_DDRC_RCR, BIT(0) },
212 [IMX8MQ_RESET_DDRC1_CORE_RESET] = { SRC_DDRC_RCR, BIT(1) },
213 [IMX8MQ_RESET_DDRC1_PHY_RESET] = { SRC_DDRC_RCR, BIT(2) },
214 [IMX8MQ_RESET_DDRC2_PHY_RESET] = { SRC_DDRC2_RCR, BIT(0) },
215 [IMX8MQ_RESET_DDRC2_CORE_RESET] = { SRC_DDRC2_RCR, BIT(1) },
216 [IMX8MQ_RESET_DDRC2_PRST] = { SRC_DDRC2_RCR, BIT(2) },
217};
218
219static int imx8mq_reset_set(struct reset_controller_dev *rcdev,
220 unsigned long id, bool assert)
221{
222 struct imx7_src *imx7src = to_imx7_src(rcdev);
223 const unsigned int bit = imx7src->signals[id].bit;
224 unsigned int value = assert ? bit : 0;
225
226 switch (id) {
227 case IMX8MQ_RESET_PCIEPHY:
228 case IMX8MQ_RESET_PCIEPHY2:
229 /*
230 * wait for more than 10us to release phy g_rst and
231 * btnrst
232 */
233 if (!assert)
234 udelay(10);
235 break;
236
237 case IMX8MQ_RESET_PCIE_CTRL_APPS_EN:
238 case IMX8MQ_RESET_PCIE2_CTRL_APPS_EN:
239 case IMX8MQ_RESET_MIPI_DSI_PCLK_RESET_N:
240 case IMX8MQ_RESET_MIPI_DSI_ESC_RESET_N:
241 case IMX8MQ_RESET_MIPI_DSI_DPI_RESET_N:
242 case IMX8MQ_RESET_MIPI_DSI_RESET_N:
243 case IMX8MQ_RESET_MIPI_DSI_RESET_BYTE_N:
244 case IMX8MQ_RESET_M4_ENABLE:
245 value = assert ? 0 : bit;
246 break;
247 }
248
249 return imx7_reset_update(imx7src, id, value);
250}
251
252static int imx8mq_reset_assert(struct reset_controller_dev *rcdev,
253 unsigned long id)
254{
255 return imx8mq_reset_set(rcdev, id, true);
256}
257
258static int imx8mq_reset_deassert(struct reset_controller_dev *rcdev,
259 unsigned long id)
260{
261 return imx8mq_reset_set(rcdev, id, false);
262}
263
264static const struct imx7_src_variant variant_imx8mq = {
265 .signals = imx8mq_src_signals,
266 .signals_num = ARRAY_SIZE(imx8mq_src_signals),
267 .ops = {
268 .assert = imx8mq_reset_assert,
269 .deassert = imx8mq_reset_deassert,
270 },
271};
272
273static const struct imx7_src_signal imx8mp_src_signals[IMX8MP_RESET_NUM] = {
274 [IMX8MP_RESET_A53_CORE_POR_RESET0] = { SRC_A53RCR0, BIT(0) },
275 [IMX8MP_RESET_A53_CORE_POR_RESET1] = { SRC_A53RCR0, BIT(1) },
276 [IMX8MP_RESET_A53_CORE_POR_RESET2] = { SRC_A53RCR0, BIT(2) },
277 [IMX8MP_RESET_A53_CORE_POR_RESET3] = { SRC_A53RCR0, BIT(3) },
278 [IMX8MP_RESET_A53_CORE_RESET0] = { SRC_A53RCR0, BIT(4) },
279 [IMX8MP_RESET_A53_CORE_RESET1] = { SRC_A53RCR0, BIT(5) },
280 [IMX8MP_RESET_A53_CORE_RESET2] = { SRC_A53RCR0, BIT(6) },
281 [IMX8MP_RESET_A53_CORE_RESET3] = { SRC_A53RCR0, BIT(7) },
282 [IMX8MP_RESET_A53_DBG_RESET0] = { SRC_A53RCR0, BIT(8) },
283 [IMX8MP_RESET_A53_DBG_RESET1] = { SRC_A53RCR0, BIT(9) },
284 [IMX8MP_RESET_A53_DBG_RESET2] = { SRC_A53RCR0, BIT(10) },
285 [IMX8MP_RESET_A53_DBG_RESET3] = { SRC_A53RCR0, BIT(11) },
286 [IMX8MP_RESET_A53_ETM_RESET0] = { SRC_A53RCR0, BIT(12) },
287 [IMX8MP_RESET_A53_ETM_RESET1] = { SRC_A53RCR0, BIT(13) },
288 [IMX8MP_RESET_A53_ETM_RESET2] = { SRC_A53RCR0, BIT(14) },
289 [IMX8MP_RESET_A53_ETM_RESET3] = { SRC_A53RCR0, BIT(15) },
290 [IMX8MP_RESET_A53_SOC_DBG_RESET] = { SRC_A53RCR0, BIT(20) },
291 [IMX8MP_RESET_A53_L2RESET] = { SRC_A53RCR0, BIT(21) },
292 [IMX8MP_RESET_SW_NON_SCLR_M7C_RST] = { SRC_M4RCR, BIT(0) },
293 [IMX8MP_RESET_OTG1_PHY_RESET] = { SRC_USBOPHY1_RCR, BIT(0) },
294 [IMX8MP_RESET_OTG2_PHY_RESET] = { SRC_USBOPHY2_RCR, BIT(0) },
295 [IMX8MP_RESET_SUPERMIX_RESET] = { SRC_SUPERMIX_RCR, BIT(0) },
296 [IMX8MP_RESET_AUDIOMIX_RESET] = { SRC_AUDIOMIX_RCR, BIT(0) },
297 [IMX8MP_RESET_MLMIX_RESET] = { SRC_MLMIX_RCR, BIT(0) },
298 [IMX8MP_RESET_PCIEPHY] = { SRC_PCIEPHY_RCR, BIT(2) },
299 [IMX8MP_RESET_PCIEPHY_PERST] = { SRC_PCIEPHY_RCR, BIT(3) },
300 [IMX8MP_RESET_PCIE_CTRL_APPS_EN] = { SRC_PCIEPHY_RCR, BIT(6) },
301 [IMX8MP_RESET_PCIE_CTRL_APPS_TURNOFF] = { SRC_PCIEPHY_RCR, BIT(11) },
302 [IMX8MP_RESET_HDMI_PHY_APB_RESET] = { SRC_HDMI_RCR, BIT(0) },
303 [IMX8MP_RESET_MEDIA_RESET] = { SRC_DISP_RCR, BIT(0) },
304 [IMX8MP_RESET_GPU2D_RESET] = { SRC_GPU2D_RCR, BIT(0) },
305 [IMX8MP_RESET_GPU3D_RESET] = { SRC_GPU3D_RCR, BIT(0) },
306 [IMX8MP_RESET_GPU_RESET] = { SRC_GPU_RCR, BIT(0) },
307 [IMX8MP_RESET_VPU_RESET] = { SRC_VPU_RCR, BIT(0) },
308 [IMX8MP_RESET_VPU_G1_RESET] = { SRC_VPU_G1_RCR, BIT(0) },
309 [IMX8MP_RESET_VPU_G2_RESET] = { SRC_VPU_G2_RCR, BIT(0) },
310 [IMX8MP_RESET_VPUVC8KE_RESET] = { SRC_VPUVC8KE_RCR, BIT(0) },
311 [IMX8MP_RESET_NOC_RESET] = { SRC_NOC_RCR, BIT(0) },
312};
313
314static int imx8mp_reset_set(struct reset_controller_dev *rcdev,
315 unsigned long id, bool assert)
316{
317 struct imx7_src *imx7src = to_imx7_src(rcdev);
318 const unsigned int bit = imx7src->signals[id].bit;
319 unsigned int value = assert ? bit : 0;
320
321 switch (id) {
322 case IMX8MP_RESET_PCIEPHY:
323 /*
324 * wait for more than 10us to release phy g_rst and
325 * btnrst
326 */
327 if (!assert)
328 udelay(10);
329 break;
330
331 case IMX8MP_RESET_PCIE_CTRL_APPS_EN:
332 case IMX8MP_RESET_PCIEPHY_PERST:
333 value = assert ? 0 : bit;
334 break;
335 }
336
337 return imx7_reset_update(imx7src, id, value);
338}
339
340static int imx8mp_reset_assert(struct reset_controller_dev *rcdev,
341 unsigned long id)
342{
343 return imx8mp_reset_set(rcdev, id, true);
344}
345
346static int imx8mp_reset_deassert(struct reset_controller_dev *rcdev,
347 unsigned long id)
348{
349 return imx8mp_reset_set(rcdev, id, false);
350}
351
352static const struct imx7_src_variant variant_imx8mp = {
353 .signals = imx8mp_src_signals,
354 .signals_num = ARRAY_SIZE(imx8mp_src_signals),
355 .ops = {
356 .assert = imx8mp_reset_assert,
357 .deassert = imx8mp_reset_deassert,
358 },
359};
360
361static int imx7_reset_probe(struct platform_device *pdev)
362{
363 struct imx7_src *imx7src;
364 struct device *dev = &pdev->dev;
365 struct regmap_config config = { .name = "src" };
366 const struct imx7_src_variant *variant = of_device_get_match_data(dev);
367
368 imx7src = devm_kzalloc(dev, sizeof(*imx7src), GFP_KERNEL);
369 if (!imx7src)
370 return -ENOMEM;
371
372 imx7src->signals = variant->signals;
373 imx7src->regmap = syscon_node_to_regmap(dev->of_node);
374 if (IS_ERR(imx7src->regmap)) {
375 dev_err(dev, "Unable to get imx7-src regmap");
376 return PTR_ERR(imx7src->regmap);
377 }
378 regmap_attach_dev(dev, imx7src->regmap, &config);
379
380 imx7src->rcdev.owner = THIS_MODULE;
381 imx7src->rcdev.nr_resets = variant->signals_num;
382 imx7src->rcdev.ops = &variant->ops;
383 imx7src->rcdev.of_node = dev->of_node;
384
385 return devm_reset_controller_register(dev, &imx7src->rcdev);
386}
387
388static const struct of_device_id imx7_reset_dt_ids[] = {
389 { .compatible = "fsl,imx7d-src", .data = &variant_imx7 },
390 { .compatible = "fsl,imx8mq-src", .data = &variant_imx8mq },
391 { .compatible = "fsl,imx8mp-src", .data = &variant_imx8mp },
392 { /* sentinel */ },
393};
394MODULE_DEVICE_TABLE(of, imx7_reset_dt_ids);
395
396static struct platform_driver imx7_reset_driver = {
397 .probe = imx7_reset_probe,
398 .driver = {
399 .name = KBUILD_MODNAME,
400 .of_match_table = imx7_reset_dt_ids,
401 },
402};
403module_platform_driver(imx7_reset_driver);
404
405MODULE_AUTHOR("Andrey Smirnov <andrew.smirnov@gmail.com>");
406MODULE_DESCRIPTION("NXP i.MX7 reset driver");
407MODULE_LICENSE("GPL v2");