drivers/usb/mtu3/mtu3_host.c

   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 }