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/iopoll.h> 12 #include <linux/irq.h> 13 #include <linux/kernel.h> 14 #include <linux/mfd/syscon.h> 15 #include <linux/of_device.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 /* mt2712 etc */ 28 #define PERI_SSUSB_SPM_CTRL 0x0 29 #define SSC_IP_SLEEP_EN BIT(4) 30 #define SSC_SPM_INT_EN BIT(1) 31 32 enum ssusb_uwk_vers { 33 SSUSB_UWK_V1 = 1, 34 SSUSB_UWK_V2, 35 }; 36 37 /* 38 * ip-sleep wakeup mode: 39 * all clocks can be turn off, but power domain should be kept on 40 */ 41 static void ssusb_wakeup_ip_sleep_set(struct ssusb_mtk *ssusb, bool enable) 42 { 43 u32 reg, msk, val; 44 45 switch (ssusb->uwk_vers) { 46 case SSUSB_UWK_V1: 47 reg = ssusb->uwk_reg_base + PERI_WK_CTRL1; 48 msk = WC1_IS_EN | WC1_IS_C(0xf) | WC1_IS_P; 49 val = enable ? (WC1_IS_EN | WC1_IS_C(0x8)) : 0; 50 break; 51 case SSUSB_UWK_V2: 52 reg = ssusb->uwk_reg_base + PERI_SSUSB_SPM_CTRL; 53 msk = SSC_IP_SLEEP_EN | SSC_SPM_INT_EN; 54 val = enable ? msk : 0; 55 break; 56 default: 57 return; 58 } 59 regmap_update_bits(ssusb->uwk, reg, msk, val); 60 } 61 62 int ssusb_wakeup_of_property_parse(struct ssusb_mtk *ssusb, 63 struct device_node *dn) 64 { 65 struct of_phandle_args args; 66 int ret; 67 68 /* wakeup function is optional */ 69 ssusb->uwk_en = of_property_read_bool(dn, "wakeup-source"); 70 if (!ssusb->uwk_en) 71 return 0; 72 73 ret = of_parse_phandle_with_fixed_args(dn, 74 "mediatek,syscon-wakeup", 2, 0, &args); 75 if (ret) 76 return ret; 77 78 ssusb->uwk_reg_base = args.args[0]; 79 ssusb->uwk_vers = args.args[1]; 80 ssusb->uwk = syscon_node_to_regmap(args.np); 81 of_node_put(args.np); 82 dev_info(ssusb->dev, "uwk - reg:0x%x, version:%d\n", 83 ssusb->uwk_reg_base, ssusb->uwk_vers); 84 85 return PTR_ERR_OR_ZERO(ssusb->uwk); 86 } 87 88 void ssusb_wakeup_set(struct ssusb_mtk *ssusb, bool enable) 89 { 90 if (ssusb->uwk_en) 91 ssusb_wakeup_ip_sleep_set(ssusb, enable); 92 } 93 94 static void host_ports_num_get(struct ssusb_mtk *ssusb) 95 { 96 u32 xhci_cap; 97 98 xhci_cap = mtu3_readl(ssusb->ippc_base, U3D_SSUSB_IP_XHCI_CAP); 99 ssusb->u2_ports = SSUSB_IP_XHCI_U2_PORT_NUM(xhci_cap); 100 ssusb->u3_ports = SSUSB_IP_XHCI_U3_PORT_NUM(xhci_cap); 101 102 dev_dbg(ssusb->dev, "host - u2_ports:%d, u3_ports:%d\n", 103 ssusb->u2_ports, ssusb->u3_ports); 104 } 105 106 /* only configure ports will be used later */ 107 int ssusb_host_enable(struct ssusb_mtk *ssusb) 108 { 109 void __iomem *ibase = ssusb->ippc_base; 110 int num_u3p = ssusb->u3_ports; 111 int num_u2p = ssusb->u2_ports; 112 int u3_ports_disabed; 113 u32 check_clk; 114 u32 value; 115 int i; 116 117 /* power on host ip */ 118 mtu3_clrbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN); 119 120 /* power on and enable u3 ports except skipped ones */ 121 u3_ports_disabed = 0; 122 for (i = 0; i < num_u3p; i++) { 123 if ((0x1 << i) & ssusb->u3p_dis_msk) { 124 u3_ports_disabed++; 125 continue; 126 } 127 128 value = mtu3_readl(ibase, SSUSB_U3_CTRL(i)); 129 value &= ~(SSUSB_U3_PORT_PDN | SSUSB_U3_PORT_DIS); 130 value |= SSUSB_U3_PORT_HOST_SEL; 131 mtu3_writel(ibase, SSUSB_U3_CTRL(i), value); 132 } 133 134 /* power on and enable all u2 ports */ 135 for (i = 0; i < num_u2p; i++) { 136 value = mtu3_readl(ibase, SSUSB_U2_CTRL(i)); 137 value &= ~(SSUSB_U2_PORT_PDN | SSUSB_U2_PORT_DIS); 138 value |= SSUSB_U2_PORT_HOST_SEL; 139 mtu3_writel(ibase, SSUSB_U2_CTRL(i), value); 140 } 141 142 check_clk = SSUSB_XHCI_RST_B_STS; 143 if (num_u3p > u3_ports_disabed) 144 check_clk = SSUSB_U3_MAC_RST_B_STS; 145 146 return ssusb_check_clocks(ssusb, check_clk); 147 } 148 149 int ssusb_host_disable(struct ssusb_mtk *ssusb, bool suspend) 150 { 151 void __iomem *ibase = ssusb->ippc_base; 152 int num_u3p = ssusb->u3_ports; 153 int num_u2p = ssusb->u2_ports; 154 u32 value; 155 int ret; 156 int i; 157 158 /* power down and disable u3 ports except skipped ones */ 159 for (i = 0; i < num_u3p; i++) { 160 if ((0x1 << i) & ssusb->u3p_dis_msk) 161 continue; 162 163 value = mtu3_readl(ibase, SSUSB_U3_CTRL(i)); 164 value |= SSUSB_U3_PORT_PDN; 165 value |= suspend ? 0 : SSUSB_U3_PORT_DIS; 166 mtu3_writel(ibase, SSUSB_U3_CTRL(i), value); 167 } 168 169 /* power down and disable all u2 ports */ 170 for (i = 0; i < num_u2p; i++) { 171 value = mtu3_readl(ibase, SSUSB_U2_CTRL(i)); 172 value |= SSUSB_U2_PORT_PDN; 173 value |= suspend ? 0 : SSUSB_U2_PORT_DIS; 174 mtu3_writel(ibase, SSUSB_U2_CTRL(i), value); 175 } 176 177 /* power down host ip */ 178 mtu3_setbits(ibase, U3D_SSUSB_IP_PW_CTRL1, SSUSB_IP_HOST_PDN); 179 180 if (!suspend) 181 return 0; 182 183 /* wait for host ip to sleep */ 184 ret = readl_poll_timeout(ibase + U3D_SSUSB_IP_PW_STS1, value, 185 (value & SSUSB_IP_SLEEP_STS), 100, 100000); 186 if (ret) 187 dev_err(ssusb->dev, "ip sleep failed!!!\n"); 188 189 return ret; 190 } 191 192 static void ssusb_host_setup(struct ssusb_mtk *ssusb) 193 { 194 struct otg_switch_mtk *otg_sx = &ssusb->otg_switch; 195 196 host_ports_num_get(ssusb); 197 198 /* 199 * power on host and power on/enable all ports 200 * if support OTG, gadget driver will switch port0 to device mode 201 */ 202 ssusb_host_enable(ssusb); 203 204 if (otg_sx->manual_drd_enabled) 205 ssusb_set_force_mode(ssusb, MTU3_DR_FORCE_HOST); 206 207 /* if port0 supports dual-role, works as host mode by default */ 208 ssusb_set_vbus(&ssusb->otg_switch, 1); 209 } 210 211 static void ssusb_host_cleanup(struct ssusb_mtk *ssusb) 212 { 213 if (ssusb->is_host) 214 ssusb_set_vbus(&ssusb->otg_switch, 0); 215 216 ssusb_host_disable(ssusb, false); 217 } 218 219 /* 220 * If host supports multiple ports, the VBUSes(5V) of ports except port0 221 * which supports OTG are better to be enabled by default in DTS. 222 * Because the host driver will keep link with devices attached when system 223 * enters suspend mode, so no need to control VBUSes after initialization. 224 */ 225 int ssusb_host_init(struct ssusb_mtk *ssusb, struct device_node *parent_dn) 226 { 227 struct device *parent_dev = ssusb->dev; 228 int ret; 229 230 ssusb_host_setup(ssusb); 231 232 ret = of_platform_populate(parent_dn, NULL, NULL, parent_dev); 233 if (ret) { 234 dev_dbg(parent_dev, "failed to create child devices at %pOF\n", 235 parent_dn); 236 return ret; 237 } 238 239 dev_info(parent_dev, "xHCI platform device register success...\n"); 240 241 return 0; 242 } 243 244 void ssusb_host_exit(struct ssusb_mtk *ssusb) 245 { 246 of_platform_depopulate(ssusb->dev); 247 ssusb_host_cleanup(ssusb); 248 } 249