drivers/usb/chipidea/ci_hdrc_msm.c

   1 /* Copyright (c) 2010, Code Aurora Forum. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  */
   7
   8 #include <linux/module.h>
   9 #include <linux/platform_device.h>
  10 #include <linux/pm_runtime.h>
  11 #include <linux/usb/chipidea.h>
  12 #include <linux/clk.h>
  13 #include <linux/reset.h>
  14 #include <linux/mfd/syscon.h>
  15 #include <linux/regmap.h>
  16 #include <linux/io.h>
  17 #include <linux/reset-controller.h>
  18 #include <linux/extcon.h>
  19 #include <linux/of.h>
  20
  21 #include "ci.h"
  22
  23 #define HS_PHY_AHB_MODE                 0x0098
  24
  25 #define HS_PHY_GENCONFIG                0x009c
  26 #define HS_PHY_TXFIFO_IDLE_FORCE_DIS    BIT(4)
  27
  28 #define HS_PHY_GENCONFIG_2              0x00a0
  29 #define HS_PHY_SESS_VLD_CTRL_EN         BIT(7)
  30 #define HS_PHY_ULPI_TX_PKT_EN_CLR_FIX   BIT(19)
  31
  32 #define HSPHY_SESS_VLD_CTRL             BIT(25)
  33
  34 /* Vendor base starts at 0x200 beyond CI base */
  35 #define HS_PHY_CTRL                     0x0040
  36 #define HS_PHY_SEC_CTRL                 0x0078
  37 #define HS_PHY_DIG_CLAMP_N              BIT(16)
  38 #define HS_PHY_POR_ASSERT               BIT(0)
  39
  40 struct ci_hdrc_msm {
  41         struct platform_device *ci;
  42         struct clk *core_clk;
  43         struct clk *iface_clk;
  44         struct clk *fs_clk;
  45         struct ci_hdrc_platform_data pdata;
  46         struct reset_controller_dev rcdev;
  47         bool secondary_phy;
  48         bool hsic;
  49         void __iomem *base;
  50 };
  51
  52 static int
  53 ci_hdrc_msm_por_reset(struct reset_controller_dev *r, unsigned long id)
  54 {
  55         struct ci_hdrc_msm *ci_msm = container_of(r, struct ci_hdrc_msm, rcdev);
  56         void __iomem *addr = ci_msm->base;
  57         u32 val;
  58
  59         if (id)
  60                 addr += HS_PHY_SEC_CTRL;
  61         else
  62                 addr += HS_PHY_CTRL;
  63
  64         val = readl_relaxed(addr);
  65         val |= HS_PHY_POR_ASSERT;
  66         writel(val, addr);
  67         /*
  68          * wait for minimum 10 microseconds as suggested by manual.
  69          * Use a slightly larger value since the exact value didn't
  70          * work 100% of the time.
  71          */
  72         udelay(12);
  73         val &= ~HS_PHY_POR_ASSERT;
  74         writel(val, addr);
  75
  76         return 0;
  77 }
  78
  79 static const struct reset_control_ops ci_hdrc_msm_reset_ops = {
  80         .reset = ci_hdrc_msm_por_reset,
  81 };
  82
  83 static int ci_hdrc_msm_notify_event(struct ci_hdrc *ci, unsigned event)
  84 {
  85         struct device *dev = ci->dev->parent;
  86         struct ci_hdrc_msm *msm_ci = dev_get_drvdata(dev);
  87         int ret;
  88
  89         switch (event) {
  90         case CI_HDRC_CONTROLLER_RESET_EVENT:
  91                 dev_dbg(dev, "CI_HDRC_CONTROLLER_RESET_EVENT received\n");
  92
  93                 hw_phymode_configure(ci);
  94                 if (msm_ci->secondary_phy) {
  95                         u32 val = readl_relaxed(msm_ci->base + HS_PHY_SEC_CTRL);
  96                         val |= HS_PHY_DIG_CLAMP_N;
  97                         writel_relaxed(val, msm_ci->base + HS_PHY_SEC_CTRL);
  98                 }
  99
 100                 ret = phy_init(ci->phy);
 101                 if (ret)
 102                         return ret;
 103
 104                 ret = phy_power_on(ci->phy);
 105                 if (ret) {
 106                         phy_exit(ci->phy);
 107                         return ret;
 108                 }
 109
 110                 /* use AHB transactor, allow posted data writes */
 111                 hw_write_id_reg(ci, HS_PHY_AHB_MODE, 0xffffffff, 0x8);
 112
 113                 /* workaround for rx buffer collision issue */
 114                 hw_write_id_reg(ci, HS_PHY_GENCONFIG,
 115                                 HS_PHY_TXFIFO_IDLE_FORCE_DIS, 0);
 116
 117                 if (!msm_ci->hsic)
 118                         hw_write_id_reg(ci, HS_PHY_GENCONFIG_2,
 119                                         HS_PHY_ULPI_TX_PKT_EN_CLR_FIX, 0);
 120
 121                 if (!IS_ERR(ci->platdata->vbus_extcon.edev)) {
 122                         hw_write_id_reg(ci, HS_PHY_GENCONFIG_2,
 123                                         HS_PHY_SESS_VLD_CTRL_EN,
 124                                         HS_PHY_SESS_VLD_CTRL_EN);
 125                         hw_write(ci, OP_USBCMD, HSPHY_SESS_VLD_CTRL,
 126                                  HSPHY_SESS_VLD_CTRL);
 127
 128                 }
 129                 break;
 130         case CI_HDRC_CONTROLLER_STOPPED_EVENT:
 131                 dev_dbg(dev, "CI_HDRC_CONTROLLER_STOPPED_EVENT received\n");
 132                 phy_power_off(ci->phy);
 133                 phy_exit(ci->phy);
 134                 break;
 135         default:
 136                 dev_dbg(dev, "unknown ci_hdrc event\n");
 137                 break;
 138         }
 139
 140         return 0;
 141 }
 142
 143 static int ci_hdrc_msm_mux_phy(struct ci_hdrc_msm *ci,
 144                                struct platform_device *pdev)
 145 {
 146         struct regmap *regmap;
 147         struct device *dev = &pdev->dev;
 148         struct of_phandle_args args;
 149         u32 val;
 150         int ret;
 151
 152         ret = of_parse_phandle_with_fixed_args(dev->of_node, "phy-select", 2, 0,
 153                                                &args);
 154         if (ret)
 155                 return 0;
 156
 157         regmap = syscon_node_to_regmap(args.np);
 158         of_node_put(args.np);
 159         if (IS_ERR(regmap))
 160                 return PTR_ERR(regmap);
 161
 162         ret = regmap_write(regmap, args.args[0], args.args[1]);
 163         if (ret)
 164                 return ret;
 165
 166         ci->secondary_phy = !!args.args[1];
 167         if (ci->secondary_phy) {
 168                 val = readl_relaxed(ci->base + HS_PHY_SEC_CTRL);
 169                 val |= HS_PHY_DIG_CLAMP_N;
 170                 writel_relaxed(val, ci->base + HS_PHY_SEC_CTRL);
 171         }
 172
 173         return 0;
 174 }
 175
 176 static int ci_hdrc_msm_probe(struct platform_device *pdev)
 177 {
 178         struct ci_hdrc_msm *ci;
 179         struct platform_device *plat_ci;
 180         struct clk *clk;
 181         struct reset_control *reset;
 182         struct resource *res;
 183         int ret;
 184         struct device_node *ulpi_node, *phy_node;
 185
 186         dev_dbg(&pdev->dev, "ci_hdrc_msm_probe\n");
 187
 188         ci = devm_kzalloc(&pdev->dev, sizeof(*ci), GFP_KERNEL);
 189         if (!ci)
 190                 return -ENOMEM;
 191         platform_set_drvdata(pdev, ci);
 192
 193         ci->pdata.name = "ci_hdrc_msm";
 194         ci->pdata.capoffset = DEF_CAPOFFSET;
 195         ci->pdata.flags = CI_HDRC_REGS_SHARED | CI_HDRC_DISABLE_STREAMING |
 196                           CI_HDRC_OVERRIDE_AHB_BURST |
 197                           CI_HDRC_OVERRIDE_PHY_CONTROL;
 198         ci->pdata.notify_event = ci_hdrc_msm_notify_event;
 199
 200         reset = devm_reset_control_get(&pdev->dev, "core");
 201         if (IS_ERR(reset))
 202                 return PTR_ERR(reset);
 203
 204         ci->core_clk = clk = devm_clk_get(&pdev->dev, "core");
 205         if (IS_ERR(clk))
 206                 return PTR_ERR(clk);
 207
 208         ci->iface_clk = clk = devm_clk_get(&pdev->dev, "iface");
 209         if (IS_ERR(clk))
 210                 return PTR_ERR(clk);
 211
 212         ci->fs_clk = clk = devm_clk_get(&pdev->dev, "fs");
 213         if (IS_ERR(clk)) {
 214                 if (PTR_ERR(clk) == -EPROBE_DEFER)
 215                         return -EPROBE_DEFER;
 216                 ci->fs_clk = NULL;
 217         }
 218
 219         res = platform_get_resource(pdev, IORESOURCE_MEM, 1);
 220         ci->base = devm_ioremap_resource(&pdev->dev, res);
 221         if (IS_ERR(ci->base))
 222                 return PTR_ERR(ci->base);
 223
 224         ci->rcdev.owner = THIS_MODULE;
 225         ci->rcdev.ops = &ci_hdrc_msm_reset_ops;
 226         ci->rcdev.of_node = pdev->dev.of_node;
 227         ci->rcdev.nr_resets = 2;
 228         ret = reset_controller_register(&ci->rcdev);
 229         if (ret)
 230                 return ret;
 231
 232         ret = clk_prepare_enable(ci->fs_clk);
 233         if (ret)
 234                 goto err_fs;
 235
 236         reset_control_assert(reset);
 237         usleep_range(10000, 12000);
 238         reset_control_deassert(reset);
 239
 240         clk_disable_unprepare(ci->fs_clk);
 241
 242         ret = clk_prepare_enable(ci->core_clk);
 243         if (ret)
 244                 goto err_fs;
 245
 246         ret = clk_prepare_enable(ci->iface_clk);
 247         if (ret)
 248                 goto err_iface;
 249
 250         ret = ci_hdrc_msm_mux_phy(ci, pdev);
 251         if (ret)
 252                 goto err_mux;
 253
 254         ulpi_node = of_find_node_by_name(of_node_get(pdev->dev.of_node), "ulpi");
 255         if (ulpi_node) {
 256                 phy_node = of_get_next_available_child(ulpi_node, NULL);
 257                 ci->hsic = of_device_is_compatible(phy_node, "qcom,usb-hsic-phy");
 258                 of_node_put(phy_node);
 259         }
 260         of_node_put(ulpi_node);
 261
 262         plat_ci = ci_hdrc_add_device(&pdev->dev, pdev->resource,
 263                                      pdev->num_resources, &ci->pdata);
 264         if (IS_ERR(plat_ci)) {
 265                 ret = PTR_ERR(plat_ci);
 266                 if (ret != -EPROBE_DEFER)
 267                         dev_err(&pdev->dev, "ci_hdrc_add_device failed!\n");
 268                 goto err_mux;
 269         }
 270
 271         ci->ci = plat_ci;
 272
 273         pm_runtime_set_active(&pdev->dev);
 274         pm_runtime_no_callbacks(&pdev->dev);
 275         pm_runtime_enable(&pdev->dev);
 276
 277         return 0;
 278
 279 err_mux:
 280         clk_disable_unprepare(ci->iface_clk);
 281 err_iface:
 282         clk_disable_unprepare(ci->core_clk);
 283 err_fs:
 284         reset_controller_unregister(&ci->rcdev);
 285         return ret;
 286 }
 287
 288 static int ci_hdrc_msm_remove(struct platform_device *pdev)
 289 {
 290         struct ci_hdrc_msm *ci = platform_get_drvdata(pdev);
 291
 292         pm_runtime_disable(&pdev->dev);
 293         ci_hdrc_remove_device(ci->ci);
 294         clk_disable_unprepare(ci->iface_clk);
 295         clk_disable_unprepare(ci->core_clk);
 296         reset_controller_unregister(&ci->rcdev);
 297
 298         return 0;
 299 }
 300
 301 static const struct of_device_id msm_ci_dt_match[] = {
 302         { .compatible = "qcom,ci-hdrc", },
 303         { }
 304 };
 305 MODULE_DEVICE_TABLE(of, msm_ci_dt_match);
 306
 307 static struct platform_driver ci_hdrc_msm_driver = {
 308         .probe = ci_hdrc_msm_probe,
 309         .remove = ci_hdrc_msm_remove,
 310         .driver = {
 311                 .name = "msm_hsusb",
 312                 .of_match_table = msm_ci_dt_match,
 313         },
 314 };
 315
 316 module_platform_driver(ci_hdrc_msm_driver);
 317
 318 MODULE_ALIAS("platform:msm_hsusb");
 319 MODULE_ALIAS("platform:ci13xxx_msm");
 320 MODULE_LICENSE("GPL v2");