1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * mtu3_dr.c - dual role switch and host glue layer 4 * 5 * Copyright (C) 2016 MediaTek Inc. 6 * 7 * Author: Chunfeng Yun <chunfeng.yun@mediatek.com> 8 */ 9 10 #include <linux/clk.h> 11 #include <linux/irq.h> 12 #include <linux/kernel.h> 13 #include <linux/mfd/syscon.h> 14 #include <linux/of.h> 15 #include <linux/of_platform.h> 16 #include <linux/regmap.h> 17 18 #include "mtu3.h" 19 #include "mtu3_dr.h" 20 21 /* mt8173 etc */ 22 #define PERI_WK_CTRL1 0x4 23 #define WC1_IS_C(x) (((x) & 0xf) << 26) /* cycle debounce */ 24 #define WC1_IS_EN BIT(25) 25 #define WC1_IS_P BIT(6) /* polarity for ip sleep */ 26 27 /* mt8183 */ 28 #define PERI_WK_CTRL0 0x0 29 #define WC0_IS_C(x) ((u32)(((x) & 0xf) << 28)) /* cycle debounce */ 30 #define WC0_IS_P BIT(12) /* polarity */ 31 #define WC0_IS_EN BIT(6) 32 33 /* mt8192 */ 34 #define WC0_SSUSB0_CDEN BIT(6) 35 #define WC0_IS_SPM_EN BIT(1) 36 37 /* mt8195 */ 38 #define PERI_WK_CTRL0_8195 0x04 39 #define WC0_IS_P_95 BIT(30) /* polarity */ 40 #define WC0_IS_C_95(x) ((u32)(((x) & 0x7) << 27)) 41 #define WC0_IS_EN_P3_95 BIT(26) 42 #define WC0_IS_EN_P2_95 BIT(25) 43 44 #define PERI_WK_CTRL1_8195 0x20 45 #define WC1_IS_C_95(x) ((u32)(((x) & 0xf) << 28)) 46 #define WC1_IS_P_95 BIT(12) 47 #define WC1_IS_EN_P0_95 BIT(6) 48 49 /* mt2712 etc */ 50 #define PERI_SSUSB_SPM_CTRL 0x0 51 #define SSC_IP_SLEEP_EN BIT(4) 52 #define SSC_SPM_INT_EN BIT(1) 53 54 enum ssusb_uwk_vers { 55 SSUSB_UWK_V1 = 1, 56 SSUSB_UWK_V2, 57 SSUSB_UWK_V1_1 = 101, /* specific revision 1.01 */ 58 SSUSB_UWK_V1_2, /* specific revision 1.02 */ 59 SSUSB_UWK_V1_3, /* mt8195 IP0 */ 60 SSUSB_UWK_V1_5 = 105, /* mt8195 IP2 */ 61 SSUSB_UWK_V1_6, /* mt8195 IP3 */ 62 }; 63 64 /* 65 * ip-sleep wakeup mode: 66 * all clocks can be turn off, but power domain should be kept on 67 */ 68 static void ssusb_wakeup_ip_sleep_set(struct ssusb_mtk *ssusb, bool enable) 69 { 70 u32 reg, msk, val; 71 72 switch (ssusb->uwk_vers) { 73 case SSUSB_UWK_V1: 74 reg = ssusb->uwk_reg_base + PERI_WK_CTRL1; 75 msk = WC1_IS_EN | WC1_IS_C(0xf) | WC1_IS_P; 76 val = enable ? (WC1_IS_EN | WC1_IS_C(0x8)) : 0; 77 break; 78 case SSUSB_UWK_V1_1: 79 reg = ssusb->uwk_reg_base + PERI_WK_CTRL0; 80 msk = WC0_IS_EN | WC0_IS_C(0xf) | WC0_IS_P; 81 val = enable ? (WC0_IS_EN | WC0_IS_C(0x1)) : 0; 82 break; 83 case SSUSB_UWK_V1_2: 84 reg = ssusb->uwk_reg_base + PERI_WK_CTRL0; 85 msk = WC0_SSUSB0_CDEN | WC0_IS_SPM_EN; 86 val = enable ? msk : 0; 87 break; 88 case SSUSB_UWK_V1_3: 89 reg = ssusb->uwk_reg_base + PERI_WK_CTRL1_8195; 90 msk = WC1_IS_EN_P0_95 | WC1_IS_C_95(0xf) | WC1_IS_P_95; 91 val = enable ? (WC1_IS_EN_P0_95 | WC1_IS_C_95(0x1)) : 0; 92 break; 93 case SSUSB_UWK_V1_5: 94 reg = ssusb->uwk_reg_base + PERI_WK_CTRL0_8195; 95 msk = WC0_IS_EN_P2_95 | WC0_IS_C_95(0x7) | WC0_IS_P_95; 96 val = enable ? (WC0_IS_EN_P2_95 | WC0_IS_C_95(0x1)) : 0; 97 break; 98 case SSUSB_UWK_V1_6: 99 reg = ssusb->uwk_reg_base + PERI_WK_CTRL0_8195; 100 msk = WC0_IS_EN_P3_95 | WC0_IS_C_95(0x7) | WC0_IS_P_95; 101 val = enable ? (WC0_IS_EN_P3_95 | WC0_IS_C_95(0x1)) : 0; 102 break; 103 case SSUSB_UWK_V2: 104 reg = ssusb->uwk_reg_base + PERI_SSUSB_SPM_CTRL; 105 msk = SSC_IP_SLEEP_EN | SSC_SPM_INT_EN; 106 val = enable ? msk : 0; 107 break; 108 default: 109 return; 110 } 111 regmap_update_bits(ssusb->uwk, reg, msk, val); 112 } 113 114 int ssusb_wakeup_of_property_parse(struct ssusb_mtk *ssusb, 115 struct device_node *dn) 116 { 117 struct of_phandle_args args; 118 int ret; 119 120 /* wakeup function is optional */ 121 ssusb->uwk_en = of_property_read_bool(dn, "wakeup-source"); 122 if (!ssusb->uwk_en) 123 return 0; 124 125 ret = of_parse_phandle_with_fixed_args(dn, 126 "mediatek,syscon-wakeup", 2, 0, &args); 127 if (ret) 128 return ret; 129 130 ssusb->uwk_reg_base = args.args[0]; 131 ssusb->uwk_vers = args.args[1]; 132 ssusb->uwk = syscon_node_to_regmap(args.np); 133 of_node_put(args.np); 134 dev_info(ssusb->dev, "uwk - reg:0x%x, version:%d\n", 135 ssusb->uwk_reg_base, ssusb->uwk_vers); 136 137 return PTR_ERR_OR_ZERO(ssusb->uwk); 138 } 139 140 void ssusb_wakeup_set(struct ssusb_mtk *ssusb, bool enable) 141 { 142 if (ssusb->uwk_en) 143 ssusb_wakeup_ip_sleep_set(ssusb, enable); 144 } 145 146 static void host_ports_num_get(struct ssusb_mtk *ssusb) 147 { 148 u32 xhci_cap; 149 150 xhci_cap = mtu3_readl(ssusb->ippc_base, U3D_SSUSB_IP_XHCI_CAP); 151 ssusb->u2_ports = SSUSB_IP_XHCI_U2_PORT_NUM(xhci_cap); 152 ssusb->u3_ports = SSUSB_IP_XHCI_U3_PORT_NUM(xhci_cap); 153 154 dev_dbg(ssusb->dev, "host - u2_ports:%d, u3_ports:%d\n", 155 ssusb->u2_ports, ssusb->u3_ports); 156 } 157 158 /* only configure ports will be used later */ 159 static int ssusb_host_enable(struct ssusb_mtk *ssusb) 160 { 161 void __iomem *ibase = ssusb->ippc_base; 162 int num_u3p = ssusb->u3_ports; 163 int num_u2p = ssusb->u2_ports; 164 int u3_ports_disabled; 165 u32 check_clk; 166 u32 value; 167 int i; 168 169 /* power on host ip */ 170 mtu3_clrbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN); 171 172 /* power on and enable u3 ports except skipped ones */ 173 u3_ports_disabled = 0; 174 for (i = 0; i < num_u3p; i++) { 175 if ((0x1 << i) & ssusb->u3p_dis_msk) { 176 u3_ports_disabled++; 177 continue; 178 } 179 180 value = mtu3_readl(ibase, SSUSB_U3_CTRL(i)); 181 value &= ~(SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS); 182 value |= SSUSB_U3_PORT_HOST_SEL; 183 mtu3_writel(ibase, SSUSB_U3_CTRL(i), value); 184 } 185 186 /* power on and enable all u2 ports */ 187 for (i = 0; i < num_u2p; i++) { 188 if ((0x1 << i) & ssusb->u2p_dis_msk) 189 continue; 190 191 value = mtu3_readl(ibase, SSUSB_U2_CTRL(i)); 192 value &= ~(SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS); 193 value |= SSUSB_U2_PORT_HOST_SEL; 194 mtu3_writel(ibase, SSUSB_U2_CTRL(i), value); 195 } 196 197 check_clk = SSUSB_XHCI_RST_B_STS; 198 if (num_u3p > u3_ports_disabled) 199 check_clk = SSUSB_U3_MAC_RST_B_STS; 200 201 return ssusb_check_clocks(ssusb, check_clk); 202 } 203 204 static int ssusb_host_disable(struct ssusb_mtk *ssusb) 205 { 206 void __iomem *ibase = ssusb->ippc_base; 207 int num_u3p = ssusb->u3_ports; 208 int num_u2p = ssusb->u2_ports; 209 u32 value; 210 int i; 211 212 /* power down and disable u3 ports except skipped ones */ 213 for (i = 0; i < num_u3p; i++) { 214 if ((0x1 << i) & ssusb->u3p_dis_msk) 215 continue; 216 217 value = mtu3_readl(ibase, SSUSB_U3_CTRL(i)); 218 value |= SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS; 219 mtu3_writel(ibase, SSUSB_U3_CTRL(i), value); 220 } 221 222 /* power down and disable u2 ports except skipped ones */ 223 for (i = 0; i < num_u2p; i++) { 224 if ((0x1 << i) & ssusb->u2p_dis_msk) 225 continue; 226 227 value = mtu3_readl(ibase, SSUSB_U2_CTRL(i)); 228 value |= SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS; 229 mtu3_writel(ibase, SSUSB_U2_CTRL(i), value); 230 } 231 232 /* power down host ip */ 233 mtu3_setbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN); 234 235 return 0; 236 } 237 238 int ssusb_host_resume(struct ssusb_mtk *ssusb, bool p0_skipped) 239 { 240 void __iomem *ibase = ssusb->ippc_base; 241 int u3p_skip_msk = ssusb->u3p_dis_msk; 242 int u2p_skip_msk = ssusb->u2p_dis_msk; 243 int num_u3p = ssusb->u3_ports; 244 int num_u2p = ssusb->u2_ports; 245 u32 value; 246 int i; 247 248 if (p0_skipped) { 249 u2p_skip_msk |= 0x1; 250 if (ssusb->otg_switch.is_u3_drd) 251 u3p_skip_msk |= 0x1; 252 } 253 254 /* power on host ip */ 255 mtu3_clrbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN); 256 257 /* power on u3 ports except skipped ones */ 258 for (i = 0; i < num_u3p; i++) { 259 if ((0x1 << i) & u3p_skip_msk) 260 continue; 261 262 value = mtu3_readl(ibase, SSUSB_U3_CTRL(i)); 263 value &= ~SSUSB_U3_PORT_PDN; 264 mtu3_writel(ibase, SSUSB_U3_CTRL(i), value); 265 } 266 267 /* power on all u2 ports except skipped ones */ 268 for (i = 0; i < num_u2p; i++) { 269 if ((0x1 << i) & u2p_skip_msk) 270 continue; 271 272 value = mtu3_readl(ibase, SSUSB_U2_CTRL(i)); 273 value &= ~SSUSB_U2_PORT_PDN; 274 mtu3_writel(ibase, SSUSB_U2_CTRL(i), value); 275 } 276 277 return 0; 278 } 279 280 /* here not skip port0 due to PDN can be set repeatedly */ 281 int ssusb_host_suspend(struct ssusb_mtk *ssusb) 282 { 283 void __iomem *ibase = ssusb->ippc_base; 284 int num_u3p = ssusb->u3_ports; 285 int num_u2p = ssusb->u2_ports; 286 u32 value; 287 int i; 288 289 /* power down u3 ports except skipped ones */ 290 for (i = 0; i < num_u3p; i++) { 291 if ((0x1 << i) & ssusb->u3p_dis_msk) 292 continue; 293 294 value = mtu3_readl(ibase, SSUSB_U3_CTRL(i)); 295 value |= SSUSB_U3_PORT_PDN; 296 mtu3_writel(ibase, SSUSB_U3_CTRL(i), value); 297 } 298 299 /* power down u2 ports except skipped ones */ 300 for (i = 0; i < num_u2p; i++) { 301 if ((0x1 << i) & ssusb->u2p_dis_msk) 302 continue; 303 304 value = mtu3_readl(ibase, SSUSB_U2_CTRL(i)); 305 value |= SSUSB_U2_PORT_PDN; 306 mtu3_writel(ibase, SSUSB_U2_CTRL(i), value); 307 } 308 309 /* power down host ip */ 310 mtu3_setbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN); 311 312 return 0; 313 } 314 315 static void ssusb_host_setup(struct ssusb_mtk *ssusb) 316 { 317 host_ports_num_get(ssusb); 318 319 /* 320 * power on host and power on/enable all ports 321 * if support OTG, gadget driver will switch port0 to device mode 322 */ 323 ssusb_host_enable(ssusb); 324 ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_HOST); 325 326 /* if port0 supports dual-role, works as host mode by default */ 327 ssusb_set_vbus(&ssusb->otg_switch, 1); 328 } 329 330 static void ssusb_host_cleanup(struct ssusb_mtk *ssusb) 331 { 332 if (ssusb->is_host) 333 ssusb_set_vbus(&ssusb->otg_switch, 0); 334 335 ssusb_host_disable(ssusb); 336 } 337 338 /* 339 * If host supports multiple ports, the VBUSes(5V) of ports except port0 340 * which supports OTG are better to be enabled by default in DTS. 341 * Because the host driver will keep link with devices attached when system 342 * enters suspend mode, so no need to control VBUSes after initialization. 343 */ 344 int ssusb_host_init(struct ssusb_mtk *ssusb, struct device_node *parent_dn) 345 { 346 struct device *parent_dev = ssusb->dev; 347 int ret; 348 349 ssusb_host_setup(ssusb); 350 351 ret = of_platform_populate(parent_dn, NULL, NULL, parent_dev); 352 if (ret) { 353 dev_dbg(parent_dev, "failed to create child devices at %pOF\n", 354 parent_dn); 355 return ret; 356 } 357 358 dev_info(parent_dev, "xHCI platform device register success...\n"); 359 360 return 0; 361 } 362 363 void ssusb_host_exit(struct ssusb_mtk *ssusb) 364 { 365 of_platform_depopulate(ssusb->dev); 366 ssusb_host_cleanup(ssusb); 367 } 368