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