drivers/usb/chipidea/ci_hdrc_msm.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright (c) 2010, Code Aurora Forum. All rights reserved. */
   3
   4 #include <linux/module.h>
   5 #include <linux/platform_device.h>
   6 #include <linux/pm_runtime.h>
   7 #include <linux/usb/chipidea.h>
   8 #include <linux/clk.h>
   9 #include <linux/reset.h>
  10 #include <linux/mfd/syscon.h>
  11 #include <linux/regmap.h>
  12 #include <linux/io.h>
  13 #include <linux/reset-controller.h>
  14 #include <linux/extcon.h>
  15 #include <linux/of.h>
  16
  17 #include "ci.h"
  18
  19 #define HS_PHY_AHB_MODE                 0x0098
  20
  21 #define HS_PHY_GENCONFIG                0x009c
  22 #define HS_PHY_TXFIFO_IDLE_FORCE_DIS    BIT(4)
  23
  24 #define HS_PHY_GENCONFIG_2              0x00a0
  25 #define HS_PHY_SESS_VLD_CTRL_EN         BIT(7)
  26 #define HS_PHY_ULPI_TX_PKT_EN_CLR_FIX   BIT(19)
  27
  28 #define HSPHY_SESS_VLD_CTRL             BIT(25)
  29
  30 /* Vendor base starts at 0x200 beyond CI base */
  31 #define HS_PHY_CTRL                     0x0040
  32 #define HS_PHY_SEC_CTRL                 0x0078
  33 #define HS_PHY_DIG_CLAMP_N              BIT(16)
  34 #define HS_PHY_POR_ASSERT               BIT(0)
  35
  36 struct ci_hdrc_msm {
  37         struct platform_device *ci;
  38         struct clk *core_clk;
  39         struct clk *iface_clk;
  40         struct clk *fs_clk;
  41         struct ci_hdrc_platform_data pdata;
  42         struct reset_controller_dev rcdev;
  43         bool secondary_phy;
  44         bool hsic;
  45         void __iomem *base;
  46 };
  47
  48 static int
  49 ci_hdrc_msm_por_reset(struct reset_controller_dev *r, unsigned long id)
  50 {
  51         struct ci_hdrc_msm *ci_msm = container_of(r, struct ci_hdrc_msm, rcdev);
  52         void __iomem *addr = ci_msm->base;
  53         u32 val;
  54
  55         if (id)
  56                 addr += HS_PHY_SEC_CTRL;
  57         else
  58                 addr += HS_PHY_CTRL;
  59
  60         val = readl_relaxed(addr);
  61         val |= HS_PHY_POR_ASSERT;
  62         writel(val, addr);
  63         /*
  64          * wait for minimum 10 microseconds as suggested by manual.
  65          * Use a slightly larger value since the exact value didn't
  66          * work 100% of the time.
  67          */
  68         udelay(12);
  69         val &= ~HS_PHY_POR_ASSERT;
  70         writel(val, addr);
  71
  72         return 0;
  73 }
  74
  75 static const struct reset_control_ops ci_hdrc_msm_reset_ops = {
  76         .reset = ci_hdrc_msm_por_reset,
  77 };
  78
  79 static int ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
  80 {
  81         struct device *dev = ci->dev->parent;
  82         struct ci_hdrc_msm *msm_ci = dev_get_drvdata(dev);
  83         int ret;
  84
  85         switch (event) {
  86         case CI_HDRC_CONTROLLER_RESET_EVENT:
  87                 dev_dbg(dev, "CI_HDRC_CONTROLLER_RESET_EVENT received\n");
  88
  89                 hw_phymode_configure(ci);
  90                 if (msm_ci->secondary_phy) {
  91                         u32 val = readl_relaxed(msm_ci->base + HS_PHY_SEC_CTRL);
  92                         val |= HS_PHY_DIG_CLAMP_N;
  93                         writel_relaxed(val, msm_ci->base + HS_PHY_SEC_CTRL);
  94                 }
  95
  96                 ret = phy_init(ci->phy);
  97                 if (ret)
  98                         return ret;
  99
 100                 ret = phy_power_on(ci->phy);
 101                 if (ret) {
 102                         phy_exit(ci->phy);
 103                         return ret;
 104                 }
 105
 106                 /* use AHB transactor, allow posted data writes */
 107                 hw_write_id_reg(ci, HS_PHY_AHB_MODE, 0xffffffff, 0x8);
 108
 109                 /* workaround for rx buffer collision issue */
 110                 hw_write_id_reg(ci, HS_PHY_GENCONFIG,
 111                                 HS_PHY_TXFIFO_IDLE_FORCE_DIS, 0);
 112
 113                 if (!msm_ci->hsic)
 114                         hw_write_id_reg(ci, HS_PHY_GENCONFIG_2,
 115                                         HS_PHY_ULPI_TX_PKT_EN_CLR_FIX, 0);
 116
 117                 if (!IS_ERR(ci->platdata->vbus_extcon.edev)) {
 118                         hw_write_id_reg(ci, HS_PHY_GENCONFIG_2,
 119                                         HS_PHY_SESS_VLD_CTRL_EN,
 120                                         HS_PHY_SESS_VLD_CTRL_EN);
 121                         hw_write(ci, OP_USBCMD, HSPHY_SESS_VLD_CTRL,
 122                                  HSPHY_SESS_VLD_CTRL);
 123
 124                 }
 125                 break;
 126         case CI_HDRC_CONTROLLER_STOPPED_EVENT:
 127                 dev_dbg(dev, "CI_HDRC_CONTROLLER_STOPPED_EVENT received\n");
 128                 phy_power_off(ci->phy);
 129                 phy_exit(ci->phy);
 130                 break;
 131         default:
 132                 dev_dbg(dev, "unknown ci_hdrc event\n");
 133                 break;
 134         }
 135
 136         return 0;
 137 }
 138
 139 static int ci_hdrc_msm_mux_phy(struct ci_hdrc_msm *ci,
 140                                struct platform_device *pdev)
 141 {
 142         struct regmap *regmap;
 143         struct device *dev = &pdev->dev;
 144         struct of_phandle_args args;
 145         u32 val;
 146         int ret;
 147
 148         ret = of_parse_phandle_with_fixed_args(dev->of_node, "phy-select", 2, 0,
 149                                                &args);
 150         if (ret)
 151                 return 0;
 152
 153         regmap = syscon_node_to_regmap(args.np);
 154         of_node_put(args.np);
 155         if (IS_ERR(regmap))
 156                 return PTR_ERR(regmap);
 157
 158         ret = regmap_write(regmap, args.args[0], args.args[1]);
 159         if (ret)
 160                 return ret;
 161
 162         ci->secondary_phy = !!args.args[1];
 163         if (ci->secondary_phy) {
 164                 val = readl_relaxed(ci->base + HS_PHY_SEC_CTRL);
 165                 val |= HS_PHY_DIG_CLAMP_N;
 166                 writel_relaxed(val, ci->base + HS_PHY_SEC_CTRL);
 167         }
 168
 169         return 0;
 170 }
 171
 172 static int ci_hdrc_msm_probe(struct platform_device *pdev)
 173 {
 174         struct ci_hdrc_msm *ci;
 175         struct platform_device *plat_ci;
 176         struct clk *clk;
 177         struct reset_control *reset;
 178         int ret;
 179         struct device_node *ulpi_node, *phy_node;
 180
 181         dev_dbg(&pdev->dev, "ci_hdrc_msm_probe\n");
 182
 183         ci = devm_kzalloc(&pdev->dev, sizeof(*ci), GFP_KERNEL);
 184         if (!ci)
 185                 return -ENOMEM;
 186         platform_set_drvdata(pdev, ci);
 187
 188         ci->pdata.name = "ci_hdrc_msm";
 189         ci->pdata.capoffset = DEF_CAPOFFSET;
 190         ci->pdata.flags = CI_HDRC_REGS_SHARED | CI_HDRC_DISABLE_STREAMING |
 191                           CI_HDRC_OVERRIDE_AHB_BURST |
 192                           CI_HDRC_OVERRIDE_PHY_CONTROL;
 193         ci->pdata.notify_event = ci_hdrc_msm_notify_event;
 194
 195         reset = devm_reset_control_get(&pdev->dev, "core");
 196         if (IS_ERR(reset))
 197                 return PTR_ERR(reset);
 198
 199         ci->core_clk = clk = devm_clk_get(&pdev->dev, "core");
 200         if (IS_ERR(clk))
 201                 return PTR_ERR(clk);
 202
 203         ci->iface_clk = clk = devm_clk_get(&pdev->dev, "iface");
 204         if (IS_ERR(clk))
 205                 return PTR_ERR(clk);
 206
 207         ci->fs_clk = clk = devm_clk_get_optional(&pdev->dev, "fs");
 208         if (IS_ERR(clk))
 209                 return PTR_ERR(clk);
 210
 211         ci->base = devm_platform_ioremap_resource(pdev, 1);
 212         if (IS_ERR(ci->base))
 213                 return PTR_ERR(ci->base);
 214
 215         ci->rcdev.owner = THIS_MODULE;
 216         ci->rcdev.ops = &ci_hdrc_msm_reset_ops;
 217         ci->rcdev.of_node = pdev->dev.of_node;
 218         ci->rcdev.nr_resets = 2;
 219         ret = reset_controller_register(&ci->rcdev);
 220         if (ret)
 221                 return ret;
 222
 223         ret = clk_prepare_enable(ci->fs_clk);
 224         if (ret)
 225                 goto err_fs;
 226
 227         reset_control_assert(reset);
 228         usleep_range(10000, 12000);
 229         reset_control_deassert(reset);
 230
 231         clk_disable_unprepare(ci->fs_clk);
 232
 233         ret = clk_prepare_enable(ci->core_clk);
 234         if (ret)
 235                 goto err_fs;
 236
 237         ret = clk_prepare_enable(ci->iface_clk);
 238         if (ret)
 239                 goto err_iface;
 240
 241         ret = ci_hdrc_msm_mux_phy(ci, pdev);
 242         if (ret)
 243                 goto err_mux;
 244
 245         ulpi_node = of_get_child_by_name(pdev->dev.of_node, "ulpi");
 246         if (ulpi_node) {
 247                 phy_node = of_get_next_available_child(ulpi_node, NULL);
 248                 ci->hsic = of_device_is_compatible(phy_node, "qcom,usb-hsic-phy");
 249                 of_node_put(phy_node);
 250         }
 251         of_node_put(ulpi_node);
 252
 253         plat_ci = ci_hdrc_add_device(&pdev->dev, pdev->resource,
 254                                      pdev->num_resources, &ci->pdata);
 255         if (IS_ERR(plat_ci)) {
 256                 ret = PTR_ERR(plat_ci);
 257                 if (ret != -EPROBE_DEFER)
 258                         dev_err(&pdev->dev, "ci_hdrc_add_device failed!\n");
 259                 goto err_mux;
 260         }
 261
 262         ci->ci = plat_ci;
 263
 264         pm_runtime_set_active(&pdev->dev);
 265         pm_runtime_no_callbacks(&pdev->dev);
 266         pm_runtime_enable(&pdev->dev);
 267
 268         return 0;
 269
 270 err_mux:
 271         clk_disable_unprepare(ci->iface_clk);
 272 err_iface:
 273         clk_disable_unprepare(ci->core_clk);
 274 err_fs:
 275         reset_controller_unregister(&ci->rcdev);
 276         return ret;
 277 }
 278
 279 static int ci_hdrc_msm_remove(struct platform_device *pdev)
 280 {
 281         struct ci_hdrc_msm *ci = platform_get_drvdata(pdev);
 282
 283         pm_runtime_disable(&pdev->dev);
 284         ci_hdrc_remove_device(ci->ci);
 285         clk_disable_unprepare(ci->iface_clk);
 286         clk_disable_unprepare(ci->core_clk);
 287         reset_controller_unregister(&ci->rcdev);
 288
 289         return 0;
 290 }
 291
 292 static const struct of_device_id msm_ci_dt_match[] = {
 293         { .compatible = "qcom,ci-hdrc", },
 294         { }
 295 };
 296 MODULE_DEVICE_TABLE(of, msm_ci_dt_match);
 297
 298 static struct platform_driver ci_hdrc_msm_driver = {
 299         .probe = ci_hdrc_msm_probe,
 300         .remove = ci_hdrc_msm_remove,
 301         .driver = {
 302                 .name = "msm_hsusb",
 303                 .of_match_table = msm_ci_dt_match,
 304         },
 305 };
 306
 307 module_platform_driver(ci_hdrc_msm_driver);
 308
 309 MODULE_ALIAS("platform:msm_hsusb");
 310 MODULE_ALIAS("platform:ci13xxx_msm");
 311 MODULE_LICENSE("GPL v2");