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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/mod_devicetable.h>
12#include <linux/of_device.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
19struct imx7_src_signal {
20 unsigned int offset, bit;
21};
22
23struct imx7_src_variant {
24 const struct imx7_src_signal *signals;
25 unsigned int signals_num;
26 struct reset_control_ops ops;
27};
28
29struct imx7_src {
30 struct reset_controller_dev rcdev;
31 struct regmap *regmap;
32 const struct imx7_src_signal *signals;
33};
34
35enum imx7_src_registers {
36 SRC_A7RCR0 = 0x0004,
37 SRC_M4RCR = 0x000c,
38 SRC_ERCR = 0x0014,
39 SRC_HSICPHY_RCR = 0x001c,
40 SRC_USBOPHY1_RCR = 0x0020,
41 SRC_USBOPHY2_RCR = 0x0024,
42 SRC_MIPIPHY_RCR = 0x0028,
43 SRC_PCIEPHY_RCR = 0x002c,
44 SRC_DDRC_RCR = 0x1000,
45};
46
47static int imx7_reset_update(struct imx7_src *imx7src,
48 unsigned long id, unsigned int value)
49{
50 const struct imx7_src_signal *signal = &imx7src->signals[id];
51
52 return regmap_update_bits(imx7src->regmap,
53 signal->offset, signal->bit, value);
54}
55
56static const struct imx7_src_signal imx7_src_signals[IMX7_RESET_NUM] = {
57 [IMX7_RESET_A7_CORE_POR_RESET0] = { SRC_A7RCR0, BIT(0) },
58 [IMX7_RESET_A7_CORE_POR_RESET1] = { SRC_A7RCR0, BIT(1) },
59 [IMX7_RESET_A7_CORE_RESET0] = { SRC_A7RCR0, BIT(4) },
60 [IMX7_RESET_A7_CORE_RESET1] = { SRC_A7RCR0, BIT(5) },
61 [IMX7_RESET_A7_DBG_RESET0] = { SRC_A7RCR0, BIT(8) },
62 [IMX7_RESET_A7_DBG_RESET1] = { SRC_A7RCR0, BIT(9) },
63 [IMX7_RESET_A7_ETM_RESET0] = { SRC_A7RCR0, BIT(12) },
64 [IMX7_RESET_A7_ETM_RESET1] = { SRC_A7RCR0, BIT(13) },
65 [IMX7_RESET_A7_SOC_DBG_RESET] = { SRC_A7RCR0, BIT(20) },
66 [IMX7_RESET_A7_L2RESET] = { SRC_A7RCR0, BIT(21) },
67 [IMX7_RESET_SW_M4C_RST] = { SRC_M4RCR, BIT(1) },
68 [IMX7_RESET_SW_M4P_RST] = { SRC_M4RCR, BIT(2) },
69 [IMX7_RESET_EIM_RST] = { SRC_ERCR, BIT(0) },
70 [IMX7_RESET_HSICPHY_PORT_RST] = { SRC_HSICPHY_RCR, BIT(1) },
71 [IMX7_RESET_USBPHY1_POR] = { SRC_USBOPHY1_RCR, BIT(0) },
72 [IMX7_RESET_USBPHY1_PORT_RST] = { SRC_USBOPHY1_RCR, BIT(1) },
73 [IMX7_RESET_USBPHY2_POR] = { SRC_USBOPHY2_RCR, BIT(0) },
74 [IMX7_RESET_USBPHY2_PORT_RST] = { SRC_USBOPHY2_RCR, BIT(1) },
75 [IMX7_RESET_MIPI_PHY_MRST] = { SRC_MIPIPHY_RCR, BIT(1) },
76 [IMX7_RESET_MIPI_PHY_SRST] = { SRC_MIPIPHY_RCR, BIT(2) },
77 [IMX7_RESET_PCIEPHY] = { SRC_PCIEPHY_RCR, BIT(2) | BIT(1) },
78 [IMX7_RESET_PCIEPHY_PERST] = { SRC_PCIEPHY_RCR, BIT(3) },
79 [IMX7_RESET_PCIE_CTRL_APPS_EN] = { SRC_PCIEPHY_RCR, BIT(6) },
80 [IMX7_RESET_PCIE_CTRL_APPS_TURNOFF] = { SRC_PCIEPHY_RCR, BIT(11) },
81 [IMX7_RESET_DDRC_PRST] = { SRC_DDRC_RCR, BIT(0) },
82 [IMX7_RESET_DDRC_CORE_RST] = { SRC_DDRC_RCR, BIT(1) },
83};
84
85static struct imx7_src *to_imx7_src(struct reset_controller_dev *rcdev)
86{
87 return container_of(rcdev, struct imx7_src, rcdev);
88}
89
90static int imx7_reset_set(struct reset_controller_dev *rcdev,
91 unsigned long id, bool assert)
92{
93 struct imx7_src *imx7src = to_imx7_src(rcdev);
94 const unsigned int bit = imx7src->signals[id].bit;
95 unsigned int value = assert ? bit : 0;
96
97 switch (id) {
98 case IMX7_RESET_PCIEPHY:
99 /*
100 * wait for more than 10us to release phy g_rst and
101 * btnrst
102 */
103 if (!assert)
104 udelay(10);
105 break;
106
107 case IMX7_RESET_PCIE_CTRL_APPS_EN:
108 value = assert ? 0 : bit;
109 break;
110 }
111
112 return imx7_reset_update(imx7src, id, value);
113}
114
115static int imx7_reset_assert(struct reset_controller_dev *rcdev,
116 unsigned long id)
117{
118 return imx7_reset_set(rcdev, id, true);
119}
120
121static int imx7_reset_deassert(struct reset_controller_dev *rcdev,
122 unsigned long id)
123{
124 return imx7_reset_set(rcdev, id, false);
125}
126
127static const struct imx7_src_variant variant_imx7 = {
128 .signals = imx7_src_signals,
129 .signals_num = ARRAY_SIZE(imx7_src_signals),
130 .ops = {
131 .assert = imx7_reset_assert,
132 .deassert = imx7_reset_deassert,
133 },
134};
135
136enum imx8mq_src_registers {
137 SRC_A53RCR0 = 0x0004,
138 SRC_HDMI_RCR = 0x0030,
139 SRC_DISP_RCR = 0x0034,
140 SRC_GPU_RCR = 0x0040,
141 SRC_VPU_RCR = 0x0044,
142 SRC_PCIE2_RCR = 0x0048,
143 SRC_MIPIPHY1_RCR = 0x004c,
144 SRC_MIPIPHY2_RCR = 0x0050,
145 SRC_DDRC2_RCR = 0x1004,
146};
147
148static const struct imx7_src_signal imx8mq_src_signals[IMX8MQ_RESET_NUM] = {
149 [IMX8MQ_RESET_A53_CORE_POR_RESET0] = { SRC_A53RCR0, BIT(0) },
150 [IMX8MQ_RESET_A53_CORE_POR_RESET1] = { SRC_A53RCR0, BIT(1) },
151 [IMX8MQ_RESET_A53_CORE_POR_RESET2] = { SRC_A53RCR0, BIT(2) },
152 [IMX8MQ_RESET_A53_CORE_POR_RESET3] = { SRC_A53RCR0, BIT(3) },
153 [IMX8MQ_RESET_A53_CORE_RESET0] = { SRC_A53RCR0, BIT(4) },
154 [IMX8MQ_RESET_A53_CORE_RESET1] = { SRC_A53RCR0, BIT(5) },
155 [IMX8MQ_RESET_A53_CORE_RESET2] = { SRC_A53RCR0, BIT(6) },
156 [IMX8MQ_RESET_A53_CORE_RESET3] = { SRC_A53RCR0, BIT(7) },
157 [IMX8MQ_RESET_A53_DBG_RESET0] = { SRC_A53RCR0, BIT(8) },
158 [IMX8MQ_RESET_A53_DBG_RESET1] = { SRC_A53RCR0, BIT(9) },
159 [IMX8MQ_RESET_A53_DBG_RESET2] = { SRC_A53RCR0, BIT(10) },
160 [IMX8MQ_RESET_A53_DBG_RESET3] = { SRC_A53RCR0, BIT(11) },
161 [IMX8MQ_RESET_A53_ETM_RESET0] = { SRC_A53RCR0, BIT(12) },
162 [IMX8MQ_RESET_A53_ETM_RESET1] = { SRC_A53RCR0, BIT(13) },
163 [IMX8MQ_RESET_A53_ETM_RESET2] = { SRC_A53RCR0, BIT(14) },
164 [IMX8MQ_RESET_A53_ETM_RESET3] = { SRC_A53RCR0, BIT(15) },
165 [IMX8MQ_RESET_A53_SOC_DBG_RESET] = { SRC_A53RCR0, BIT(20) },
166 [IMX8MQ_RESET_A53_L2RESET] = { SRC_A53RCR0, BIT(21) },
167 [IMX8MQ_RESET_SW_NON_SCLR_M4C_RST] = { SRC_M4RCR, BIT(0) },
168 [IMX8MQ_RESET_OTG1_PHY_RESET] = { SRC_USBOPHY1_RCR, BIT(0) },
169 [IMX8MQ_RESET_OTG2_PHY_RESET] = { SRC_USBOPHY2_RCR, BIT(0) },
170 [IMX8MQ_RESET_MIPI_DSI_RESET_BYTE_N] = { SRC_MIPIPHY_RCR, BIT(1) },
171 [IMX8MQ_RESET_MIPI_DSI_RESET_N] = { SRC_MIPIPHY_RCR, BIT(2) },
172 [IMX8MQ_RESET_MIPI_DSI_DPI_RESET_N] = { SRC_MIPIPHY_RCR, BIT(3) },
173 [IMX8MQ_RESET_MIPI_DSI_ESC_RESET_N] = { SRC_MIPIPHY_RCR, BIT(4) },
174 [IMX8MQ_RESET_MIPI_DSI_PCLK_RESET_N] = { SRC_MIPIPHY_RCR, BIT(5) },
175 [IMX8MQ_RESET_PCIEPHY] = { SRC_PCIEPHY_RCR,
176 BIT(2) | BIT(1) },
177 [IMX8MQ_RESET_PCIEPHY_PERST] = { SRC_PCIEPHY_RCR, BIT(3) },
178 [IMX8MQ_RESET_PCIE_CTRL_APPS_EN] = { SRC_PCIEPHY_RCR, BIT(6) },
179 [IMX8MQ_RESET_PCIE_CTRL_APPS_TURNOFF] = { SRC_PCIEPHY_RCR, BIT(11) },
180 [IMX8MQ_RESET_HDMI_PHY_APB_RESET] = { SRC_HDMI_RCR, BIT(0) },
181 [IMX8MQ_RESET_DISP_RESET] = { SRC_DISP_RCR, BIT(0) },
182 [IMX8MQ_RESET_GPU_RESET] = { SRC_GPU_RCR, BIT(0) },
183 [IMX8MQ_RESET_VPU_RESET] = { SRC_VPU_RCR, BIT(0) },
184 [IMX8MQ_RESET_PCIEPHY2] = { SRC_PCIE2_RCR,
185 BIT(2) | BIT(1) },
186 [IMX8MQ_RESET_PCIEPHY2_PERST] = { SRC_PCIE2_RCR, BIT(3) },
187 [IMX8MQ_RESET_PCIE2_CTRL_APPS_EN] = { SRC_PCIE2_RCR, BIT(6) },
188 [IMX8MQ_RESET_PCIE2_CTRL_APPS_TURNOFF] = { SRC_PCIE2_RCR, BIT(11) },
189 [IMX8MQ_RESET_MIPI_CSI1_CORE_RESET] = { SRC_MIPIPHY1_RCR, BIT(0) },
190 [IMX8MQ_RESET_MIPI_CSI1_PHY_REF_RESET] = { SRC_MIPIPHY1_RCR, BIT(1) },
191 [IMX8MQ_RESET_MIPI_CSI1_ESC_RESET] = { SRC_MIPIPHY1_RCR, BIT(2) },
192 [IMX8MQ_RESET_MIPI_CSI2_CORE_RESET] = { SRC_MIPIPHY2_RCR, BIT(0) },
193 [IMX8MQ_RESET_MIPI_CSI2_PHY_REF_RESET] = { SRC_MIPIPHY2_RCR, BIT(1) },
194 [IMX8MQ_RESET_MIPI_CSI2_ESC_RESET] = { SRC_MIPIPHY2_RCR, BIT(2) },
195 [IMX8MQ_RESET_DDRC1_PRST] = { SRC_DDRC_RCR, BIT(0) },
196 [IMX8MQ_RESET_DDRC1_CORE_RESET] = { SRC_DDRC_RCR, BIT(1) },
197 [IMX8MQ_RESET_DDRC1_PHY_RESET] = { SRC_DDRC_RCR, BIT(2) },
198 [IMX8MQ_RESET_DDRC2_PHY_RESET] = { SRC_DDRC2_RCR, BIT(0) },
199 [IMX8MQ_RESET_DDRC2_CORE_RESET] = { SRC_DDRC2_RCR, BIT(1) },
200 [IMX8MQ_RESET_DDRC2_PRST] = { SRC_DDRC2_RCR, BIT(2) },
201};
202
203static int imx8mq_reset_set(struct reset_controller_dev *rcdev,
204 unsigned long id, bool assert)
205{
206 struct imx7_src *imx7src = to_imx7_src(rcdev);
207 const unsigned int bit = imx7src->signals[id].bit;
208 unsigned int value = assert ? bit : 0;
209
210 switch (id) {
211 case IMX8MQ_RESET_PCIEPHY:
212 case IMX8MQ_RESET_PCIEPHY2: /* fallthrough */
213 /*
214 * wait for more than 10us to release phy g_rst and
215 * btnrst
216 */
217 if (!assert)
218 udelay(10);
219 break;
220
221 case IMX8MQ_RESET_PCIE_CTRL_APPS_EN:
222 case IMX8MQ_RESET_PCIE2_CTRL_APPS_EN: /* fallthrough */
223 case IMX8MQ_RESET_MIPI_DSI_PCLK_RESET_N: /* fallthrough */
224 case IMX8MQ_RESET_MIPI_DSI_ESC_RESET_N: /* fallthrough */
225 case IMX8MQ_RESET_MIPI_DSI_DPI_RESET_N: /* fallthrough */
226 case IMX8MQ_RESET_MIPI_DSI_RESET_N: /* fallthrough */
227 case IMX8MQ_RESET_MIPI_DSI_RESET_BYTE_N: /* fallthrough */
228 value = assert ? 0 : bit;
229 break;
230 }
231
232 return imx7_reset_update(imx7src, id, value);
233}
234
235static int imx8mq_reset_assert(struct reset_controller_dev *rcdev,
236 unsigned long id)
237{
238 return imx8mq_reset_set(rcdev, id, true);
239}
240
241static int imx8mq_reset_deassert(struct reset_controller_dev *rcdev,
242 unsigned long id)
243{
244 return imx8mq_reset_set(rcdev, id, false);
245}
246
247static const struct imx7_src_variant variant_imx8mq = {
248 .signals = imx8mq_src_signals,
249 .signals_num = ARRAY_SIZE(imx8mq_src_signals),
250 .ops = {
251 .assert = imx8mq_reset_assert,
252 .deassert = imx8mq_reset_deassert,
253 },
254};
255
256static int imx7_reset_probe(struct platform_device *pdev)
257{
258 struct imx7_src *imx7src;
259 struct device *dev = &pdev->dev;
260 struct regmap_config config = { .name = "src" };
261 const struct imx7_src_variant *variant = of_device_get_match_data(dev);
262
263 imx7src = devm_kzalloc(dev, sizeof(*imx7src), GFP_KERNEL);
264 if (!imx7src)
265 return -ENOMEM;
266
267 imx7src->signals = variant->signals;
268 imx7src->regmap = syscon_node_to_regmap(dev->of_node);
269 if (IS_ERR(imx7src->regmap)) {
270 dev_err(dev, "Unable to get imx7-src regmap");
271 return PTR_ERR(imx7src->regmap);
272 }
273 regmap_attach_dev(dev, imx7src->regmap, &config);
274
275 imx7src->rcdev.owner = THIS_MODULE;
276 imx7src->rcdev.nr_resets = variant->signals_num;
277 imx7src->rcdev.ops = &variant->ops;
278 imx7src->rcdev.of_node = dev->of_node;
279
280 return devm_reset_controller_register(dev, &imx7src->rcdev);
281}
282
283static const struct of_device_id imx7_reset_dt_ids[] = {
284 { .compatible = "fsl,imx7d-src", .data = &variant_imx7 },
285 { .compatible = "fsl,imx8mq-src", .data = &variant_imx8mq },
286 { /* sentinel */ },
287};
288
289static struct platform_driver imx7_reset_driver = {
290 .probe = imx7_reset_probe,
291 .driver = {
292 .name = KBUILD_MODNAME,
293 .of_match_table = imx7_reset_dt_ids,
294 },
295};
296builtin_platform_driver(imx7_reset_driver);