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 #include <dt-bindings/reset/imx8mp-reset.h> 19 20 struct imx7_src_signal { 21 unsigned int offset, bit; 22 }; 23 24 struct imx7_src_variant { 25 const struct imx7_src_signal *signals; 26 unsigned int signals_num; 27 struct reset_control_ops ops; 28 }; 29 30 struct imx7_src { 31 struct reset_controller_dev rcdev; 32 struct regmap *regmap; 33 const struct imx7_src_signal *signals; 34 }; 35 36 enum 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 48 static 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 57 static 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 86 static struct imx7_src *to_imx7_src(struct reset_controller_dev *rcdev) 87 { 88 return container_of(rcdev, struct imx7_src, rcdev); 89 } 90 91 static 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 } 115 116 static int imx7_reset_assert(struct reset_controller_dev *rcdev, 117 unsigned long id) 118 { 119 return imx7_reset_set(rcdev, id, true); 120 } 121 122 static int imx7_reset_deassert(struct reset_controller_dev *rcdev, 123 unsigned long id) 124 { 125 return imx7_reset_set(rcdev, id, false); 126 } 127 128 static 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 }; 136 137 enum 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 }; 148 149 enum 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 }; 160 161 static 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_OTG1_PHY_RESET] = { SRC_USBOPHY1_RCR, BIT(0) }, 182 [IMX8MQ_RESET_OTG2_PHY_RESET] = { SRC_USBOPHY2_RCR, BIT(0) }, 183 [IMX8MQ_RESET_MIPI_DSI_RESET_BYTE_N] = { SRC_MIPIPHY_RCR, BIT(1) }, 184 [IMX8MQ_RESET_MIPI_DSI_RESET_N] = { SRC_MIPIPHY_RCR, BIT(2) }, 185 [IMX8MQ_RESET_MIPI_DSI_DPI_RESET_N] = { SRC_MIPIPHY_RCR, BIT(3) }, 186 [IMX8MQ_RESET_MIPI_DSI_ESC_RESET_N] = { SRC_MIPIPHY_RCR, BIT(4) }, 187 [IMX8MQ_RESET_MIPI_DSI_PCLK_RESET_N] = { SRC_MIPIPHY_RCR, BIT(5) }, 188 [IMX8MQ_RESET_PCIEPHY] = { SRC_PCIEPHY_RCR, 189 BIT(2) | BIT(1) }, 190 [IMX8MQ_RESET_PCIEPHY_PERST] = { SRC_PCIEPHY_RCR, BIT(3) }, 191 [IMX8MQ_RESET_PCIE_CTRL_APPS_EN] = { SRC_PCIEPHY_RCR, BIT(6) }, 192 [IMX8MQ_RESET_PCIE_CTRL_APPS_TURNOFF] = { SRC_PCIEPHY_RCR, BIT(11) }, 193 [IMX8MQ_RESET_HDMI_PHY_APB_RESET] = { SRC_HDMI_RCR, BIT(0) }, 194 [IMX8MQ_RESET_DISP_RESET] = { SRC_DISP_RCR, BIT(0) }, 195 [IMX8MQ_RESET_GPU_RESET] = { SRC_GPU_RCR, BIT(0) }, 196 [IMX8MQ_RESET_VPU_RESET] = { SRC_VPU_RCR, BIT(0) }, 197 [IMX8MQ_RESET_PCIEPHY2] = { SRC_PCIE2_RCR, 198 BIT(2) | BIT(1) }, 199 [IMX8MQ_RESET_PCIEPHY2_PERST] = { SRC_PCIE2_RCR, BIT(3) }, 200 [IMX8MQ_RESET_PCIE2_CTRL_APPS_EN] = { SRC_PCIE2_RCR, BIT(6) }, 201 [IMX8MQ_RESET_PCIE2_CTRL_APPS_TURNOFF] = { SRC_PCIE2_RCR, BIT(11) }, 202 [IMX8MQ_RESET_MIPI_CSI1_CORE_RESET] = { SRC_MIPIPHY1_RCR, BIT(0) }, 203 [IMX8MQ_RESET_MIPI_CSI1_PHY_REF_RESET] = { SRC_MIPIPHY1_RCR, BIT(1) }, 204 [IMX8MQ_RESET_MIPI_CSI1_ESC_RESET] = { SRC_MIPIPHY1_RCR, BIT(2) }, 205 [IMX8MQ_RESET_MIPI_CSI2_CORE_RESET] = { SRC_MIPIPHY2_RCR, BIT(0) }, 206 [IMX8MQ_RESET_MIPI_CSI2_PHY_REF_RESET] = { SRC_MIPIPHY2_RCR, BIT(1) }, 207 [IMX8MQ_RESET_MIPI_CSI2_ESC_RESET] = { SRC_MIPIPHY2_RCR, BIT(2) }, 208 [IMX8MQ_RESET_DDRC1_PRST] = { SRC_DDRC_RCR, BIT(0) }, 209 [IMX8MQ_RESET_DDRC1_CORE_RESET] = { SRC_DDRC_RCR, BIT(1) }, 210 [IMX8MQ_RESET_DDRC1_PHY_RESET] = { SRC_DDRC_RCR, BIT(2) }, 211 [IMX8MQ_RESET_DDRC2_PHY_RESET] = { SRC_DDRC2_RCR, BIT(0) }, 212 [IMX8MQ_RESET_DDRC2_CORE_RESET] = { SRC_DDRC2_RCR, BIT(1) }, 213 [IMX8MQ_RESET_DDRC2_PRST] = { SRC_DDRC2_RCR, BIT(2) }, 214 }; 215 216 static int imx8mq_reset_set(struct reset_controller_dev *rcdev, 217 unsigned long id, bool assert) 218 { 219 struct imx7_src *imx7src = to_imx7_src(rcdev); 220 const unsigned int bit = imx7src->signals[id].bit; 221 unsigned int value = assert ? bit : 0; 222 223 switch (id) { 224 case IMX8MQ_RESET_PCIEPHY: 225 case IMX8MQ_RESET_PCIEPHY2: /* fallthrough */ 226 /* 227 * wait for more than 10us to release phy g_rst and 228 * btnrst 229 */ 230 if (!assert) 231 udelay(10); 232 break; 233 234 case IMX8MQ_RESET_PCIE_CTRL_APPS_EN: 235 case IMX8MQ_RESET_PCIE2_CTRL_APPS_EN: /* fallthrough */ 236 case IMX8MQ_RESET_MIPI_DSI_PCLK_RESET_N: /* fallthrough */ 237 case IMX8MQ_RESET_MIPI_DSI_ESC_RESET_N: /* fallthrough */ 238 case IMX8MQ_RESET_MIPI_DSI_DPI_RESET_N: /* fallthrough */ 239 case IMX8MQ_RESET_MIPI_DSI_RESET_N: /* fallthrough */ 240 case IMX8MQ_RESET_MIPI_DSI_RESET_BYTE_N: /* fallthrough */ 241 value = assert ? 0 : bit; 242 break; 243 } 244 245 return imx7_reset_update(imx7src, id, value); 246 } 247 248 static int imx8mq_reset_assert(struct reset_controller_dev *rcdev, 249 unsigned long id) 250 { 251 return imx8mq_reset_set(rcdev, id, true); 252 } 253 254 static int imx8mq_reset_deassert(struct reset_controller_dev *rcdev, 255 unsigned long id) 256 { 257 return imx8mq_reset_set(rcdev, id, false); 258 } 259 260 static const struct imx7_src_variant variant_imx8mq = { 261 .signals = imx8mq_src_signals, 262 .signals_num = ARRAY_SIZE(imx8mq_src_signals), 263 .ops = { 264 .assert = imx8mq_reset_assert, 265 .deassert = imx8mq_reset_deassert, 266 }, 267 }; 268 269 static const struct imx7_src_signal imx8mp_src_signals[IMX8MP_RESET_NUM] = { 270 [IMX8MP_RESET_A53_CORE_POR_RESET0] = { SRC_A53RCR0, BIT(0) }, 271 [IMX8MP_RESET_A53_CORE_POR_RESET1] = { SRC_A53RCR0, BIT(1) }, 272 [IMX8MP_RESET_A53_CORE_POR_RESET2] = { SRC_A53RCR0, BIT(2) }, 273 [IMX8MP_RESET_A53_CORE_POR_RESET3] = { SRC_A53RCR0, BIT(3) }, 274 [IMX8MP_RESET_A53_CORE_RESET0] = { SRC_A53RCR0, BIT(4) }, 275 [IMX8MP_RESET_A53_CORE_RESET1] = { SRC_A53RCR0, BIT(5) }, 276 [IMX8MP_RESET_A53_CORE_RESET2] = { SRC_A53RCR0, BIT(6) }, 277 [IMX8MP_RESET_A53_CORE_RESET3] = { SRC_A53RCR0, BIT(7) }, 278 [IMX8MP_RESET_A53_DBG_RESET0] = { SRC_A53RCR0, BIT(8) }, 279 [IMX8MP_RESET_A53_DBG_RESET1] = { SRC_A53RCR0, BIT(9) }, 280 [IMX8MP_RESET_A53_DBG_RESET2] = { SRC_A53RCR0, BIT(10) }, 281 [IMX8MP_RESET_A53_DBG_RESET3] = { SRC_A53RCR0, BIT(11) }, 282 [IMX8MP_RESET_A53_ETM_RESET0] = { SRC_A53RCR0, BIT(12) }, 283 [IMX8MP_RESET_A53_ETM_RESET1] = { SRC_A53RCR0, BIT(13) }, 284 [IMX8MP_RESET_A53_ETM_RESET2] = { SRC_A53RCR0, BIT(14) }, 285 [IMX8MP_RESET_A53_ETM_RESET3] = { SRC_A53RCR0, BIT(15) }, 286 [IMX8MP_RESET_A53_SOC_DBG_RESET] = { SRC_A53RCR0, BIT(20) }, 287 [IMX8MP_RESET_A53_L2RESET] = { SRC_A53RCR0, BIT(21) }, 288 [IMX8MP_RESET_SW_NON_SCLR_M7C_RST] = { SRC_M4RCR, BIT(0) }, 289 [IMX8MP_RESET_OTG1_PHY_RESET] = { SRC_USBOPHY1_RCR, BIT(0) }, 290 [IMX8MP_RESET_OTG2_PHY_RESET] = { SRC_USBOPHY2_RCR, BIT(0) }, 291 [IMX8MP_RESET_SUPERMIX_RESET] = { SRC_SUPERMIX_RCR, BIT(0) }, 292 [IMX8MP_RESET_AUDIOMIX_RESET] = { SRC_AUDIOMIX_RCR, BIT(0) }, 293 [IMX8MP_RESET_MLMIX_RESET] = { SRC_MLMIX_RCR, BIT(0) }, 294 [IMX8MP_RESET_PCIEPHY] = { SRC_PCIEPHY_RCR, BIT(2) }, 295 [IMX8MP_RESET_PCIEPHY_PERST] = { SRC_PCIEPHY_RCR, BIT(3) }, 296 [IMX8MP_RESET_PCIE_CTRL_APPS_EN] = { SRC_PCIEPHY_RCR, BIT(6) }, 297 [IMX8MP_RESET_PCIE_CTRL_APPS_TURNOFF] = { SRC_PCIEPHY_RCR, BIT(11) }, 298 [IMX8MP_RESET_HDMI_PHY_APB_RESET] = { SRC_HDMI_RCR, BIT(0) }, 299 [IMX8MP_RESET_MEDIA_RESET] = { SRC_DISP_RCR, BIT(0) }, 300 [IMX8MP_RESET_GPU2D_RESET] = { SRC_GPU2D_RCR, BIT(0) }, 301 [IMX8MP_RESET_GPU3D_RESET] = { SRC_GPU3D_RCR, BIT(0) }, 302 [IMX8MP_RESET_GPU_RESET] = { SRC_GPU_RCR, BIT(0) }, 303 [IMX8MP_RESET_VPU_RESET] = { SRC_VPU_RCR, BIT(0) }, 304 [IMX8MP_RESET_VPU_G1_RESET] = { SRC_VPU_G1_RCR, BIT(0) }, 305 [IMX8MP_RESET_VPU_G2_RESET] = { SRC_VPU_G2_RCR, BIT(0) }, 306 [IMX8MP_RESET_VPUVC8KE_RESET] = { SRC_VPUVC8KE_RCR, BIT(0) }, 307 [IMX8MP_RESET_NOC_RESET] = { SRC_NOC_RCR, BIT(0) }, 308 }; 309 310 static int imx8mp_reset_set(struct reset_controller_dev *rcdev, 311 unsigned long id, bool assert) 312 { 313 struct imx7_src *imx7src = to_imx7_src(rcdev); 314 const unsigned int bit = imx7src->signals[id].bit; 315 unsigned int value = assert ? bit : 0; 316 317 switch (id) { 318 case IMX8MP_RESET_PCIEPHY: 319 /* 320 * wait for more than 10us to release phy g_rst and 321 * btnrst 322 */ 323 if (!assert) 324 udelay(10); 325 break; 326 327 case IMX8MP_RESET_PCIE_CTRL_APPS_EN: 328 value = assert ? 0 : bit; 329 break; 330 } 331 332 return imx7_reset_update(imx7src, id, value); 333 } 334 335 static int imx8mp_reset_assert(struct reset_controller_dev *rcdev, 336 unsigned long id) 337 { 338 return imx8mp_reset_set(rcdev, id, true); 339 } 340 341 static int imx8mp_reset_deassert(struct reset_controller_dev *rcdev, 342 unsigned long id) 343 { 344 return imx8mp_reset_set(rcdev, id, false); 345 } 346 347 static const struct imx7_src_variant variant_imx8mp = { 348 .signals = imx8mp_src_signals, 349 .signals_num = ARRAY_SIZE(imx8mp_src_signals), 350 .ops = { 351 .assert = imx8mp_reset_assert, 352 .deassert = imx8mp_reset_deassert, 353 }, 354 }; 355 356 static int imx7_reset_probe(struct platform_device *pdev) 357 { 358 struct imx7_src *imx7src; 359 struct device *dev = &pdev->dev; 360 struct regmap_config config = { .name = "src" }; 361 const struct imx7_src_variant *variant = of_device_get_match_data(dev); 362 363 imx7src = devm_kzalloc(dev, sizeof(*imx7src), GFP_KERNEL); 364 if (!imx7src) 365 return -ENOMEM; 366 367 imx7src->signals = variant->signals; 368 imx7src->regmap = syscon_node_to_regmap(dev->of_node); 369 if (IS_ERR(imx7src->regmap)) { 370 dev_err(dev, "Unable to get imx7-src regmap"); 371 return PTR_ERR(imx7src->regmap); 372 } 373 regmap_attach_dev(dev, imx7src->regmap, &config); 374 375 imx7src->rcdev.owner = THIS_MODULE; 376 imx7src->rcdev.nr_resets = variant->signals_num; 377 imx7src->rcdev.ops = &variant->ops; 378 imx7src->rcdev.of_node = dev->of_node; 379 380 return devm_reset_controller_register(dev, &imx7src->rcdev); 381 } 382 383 static const struct of_device_id imx7_reset_dt_ids[] = { 384 { .compatible = "fsl,imx7d-src", .data = &variant_imx7 }, 385 { .compatible = "fsl,imx8mq-src", .data = &variant_imx8mq }, 386 { .compatible = "fsl,imx8mp-src", .data = &variant_imx8mp }, 387 { /* sentinel */ }, 388 }; 389 390 static struct platform_driver imx7_reset_driver = { 391 .probe = imx7_reset_probe, 392 .driver = { 393 .name = KBUILD_MODNAME, 394 .of_match_table = imx7_reset_dt_ids, 395 }, 396 }; 397 builtin_platform_driver(imx7_reset_driver); 398