drivers/phy/phy-sun4i-usb.c

   1 /*
   2  * Allwinner sun4i USB phy driver
   3  *
   4  * Copyright (C) 2014 Hans de Goede <hdegoede@redhat.com>
   5  *
   6  * Based on code from
   7  * Allwinner Technology Co., Ltd. <www.allwinnertech.com>
   8  *
   9  * Modelled after: Samsung S5P/EXYNOS SoC series MIPI CSIS/DSIM DPHY driver
  10  * Copyright (C) 2013 Samsung Electronics Co., Ltd.
  11  * Author: Sylwester Nawrocki <s.nawrocki@samsung.com>
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License as published by
  15  * the Free Software Foundation; either version 2 of the License, or
  16  * (at your option) any later version.
  17  *
  18  * This program is distributed in the hope that it will be useful,
  19  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  20  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  21  * GNU General Public License for more details.
  22  */
  23
  24 #include <linux/clk.h>
  25 #include <linux/io.h>
  26 #include <linux/kernel.h>
  27 #include <linux/module.h>
  28 #include <linux/mutex.h>
  29 #include <linux/of.h>
  30 #include <linux/of_address.h>
  31 #include <linux/phy/phy.h>
  32 #include <linux/platform_device.h>
  33 #include <linux/regulator/consumer.h>
  34 #include <linux/reset.h>
  35
  36 #define REG_ISCR                        0x00
  37 #define REG_PHYCTL                      0x04
  38 #define REG_PHYBIST                     0x08
  39 #define REG_PHYTUNE                     0x0c
  40
  41 #define PHYCTL_DATA                     BIT(7)
  42
  43 #define SUNXI_AHB_ICHR8_EN              BIT(10)
  44 #define SUNXI_AHB_INCR4_BURST_EN        BIT(9)
  45 #define SUNXI_AHB_INCRX_ALIGN_EN        BIT(8)
  46 #define SUNXI_ULPI_BYPASS_EN            BIT(0)
  47
  48 /* Common Control Bits for Both PHYs */
  49 #define PHY_PLL_BW                      0x03
  50 #define PHY_RES45_CAL_EN                0x0c
  51
  52 /* Private Control Bits for Each PHY */
  53 #define PHY_TX_AMPLITUDE_TUNE           0x20
  54 #define PHY_TX_SLEWRATE_TUNE            0x22
  55 #define PHY_VBUSVALID_TH_SEL            0x25
  56 #define PHY_PULLUP_RES_SEL              0x27
  57 #define PHY_OTG_FUNC_EN                 0x28
  58 #define PHY_VBUS_DET_EN                 0x29
  59 #define PHY_DISCON_TH_SEL               0x2a
  60
  61 #define MAX_PHYS                        3
  62
  63 struct sun4i_usb_phy_data {
  64         void __iomem *base;
  65         struct mutex mutex;
  66         int num_phys;
  67         u32 disc_thresh;
  68         struct sun4i_usb_phy {
  69                 struct phy *phy;
  70                 void __iomem *pmu;
  71                 struct regulator *vbus;
  72                 struct reset_control *reset;
  73                 struct clk *clk;
  74                 int index;
  75         } phys[MAX_PHYS];
  76 };
  77
  78 #define to_sun4i_usb_phy_data(phy) \
  79         container_of((phy), struct sun4i_usb_phy_data, phys[(phy)->index])
  80
  81 static void sun4i_usb_phy_write(struct sun4i_usb_phy *phy, u32 addr, u32 data,
  82                                 int len)
  83 {
  84         struct sun4i_usb_phy_data *phy_data = to_sun4i_usb_phy_data(phy);
  85         u32 temp, usbc_bit = BIT(phy->index * 2);
  86         int i;
  87
  88         mutex_lock(&phy_data->mutex);
  89
  90         for (i = 0; i < len; i++) {
  91                 temp = readl(phy_data->base + REG_PHYCTL);
  92
  93                 /* clear the address portion */
  94                 temp &= ~(0xff << 8);
  95
  96                 /* set the address */
  97                 temp |= ((addr + i) << 8);
  98                 writel(temp, phy_data->base + REG_PHYCTL);
  99
 100                 /* set the data bit and clear usbc bit*/
 101                 temp = readb(phy_data->base + REG_PHYCTL);
 102                 if (data & 0x1)
 103                         temp |= PHYCTL_DATA;
 104                 else
 105                         temp &= ~PHYCTL_DATA;
 106                 temp &= ~usbc_bit;
 107                 writeb(temp, phy_data->base + REG_PHYCTL);
 108
 109                 /* pulse usbc_bit */
 110                 temp = readb(phy_data->base + REG_PHYCTL);
 111                 temp |= usbc_bit;
 112                 writeb(temp, phy_data->base + REG_PHYCTL);
 113
 114                 temp = readb(phy_data->base + REG_PHYCTL);
 115                 temp &= ~usbc_bit;
 116                 writeb(temp, phy_data->base + REG_PHYCTL);
 117
 118                 data >>= 1;
 119         }
 120         mutex_unlock(&phy_data->mutex);
 121 }
 122
 123 static void sun4i_usb_phy_passby(struct sun4i_usb_phy *phy, int enable)
 124 {
 125         u32 bits, reg_value;
 126
 127         if (!phy->pmu)
 128                 return;
 129
 130         bits = SUNXI_AHB_ICHR8_EN | SUNXI_AHB_INCR4_BURST_EN |
 131                 SUNXI_AHB_INCRX_ALIGN_EN | SUNXI_ULPI_BYPASS_EN;
 132
 133         reg_value = readl(phy->pmu);
 134
 135         if (enable)
 136                 reg_value |= bits;
 137         else
 138                 reg_value &= ~bits;
 139
 140         writel(reg_value, phy->pmu);
 141 }
 142
 143 static int sun4i_usb_phy_init(struct phy *_phy)
 144 {
 145         struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
 146         struct sun4i_usb_phy_data *data = to_sun4i_usb_phy_data(phy);
 147         int ret;
 148
 149         ret = clk_prepare_enable(phy->clk);
 150         if (ret)
 151                 return ret;
 152
 153         ret = reset_control_deassert(phy->reset);
 154         if (ret) {
 155                 clk_disable_unprepare(phy->clk);
 156                 return ret;
 157         }
 158
 159         /* Adjust PHY's magnitude and rate */
 160         sun4i_usb_phy_write(phy, PHY_TX_AMPLITUDE_TUNE, 0x14, 5);
 161
 162         /* Disconnect threshold adjustment */
 163         sun4i_usb_phy_write(phy, PHY_DISCON_TH_SEL, data->disc_thresh, 2);
 164
 165         sun4i_usb_phy_passby(phy, 1);
 166
 167         return 0;
 168 }
 169
 170 static int sun4i_usb_phy_exit(struct phy *_phy)
 171 {
 172         struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
 173
 174         sun4i_usb_phy_passby(phy, 0);
 175         reset_control_assert(phy->reset);
 176         clk_disable_unprepare(phy->clk);
 177
 178         return 0;
 179 }
 180
 181 static int sun4i_usb_phy_power_on(struct phy *_phy)
 182 {
 183         struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
 184         int ret = 0;
 185
 186         if (phy->vbus)
 187                 ret = regulator_enable(phy->vbus);
 188
 189         return ret;
 190 }
 191
 192 static int sun4i_usb_phy_power_off(struct phy *_phy)
 193 {
 194         struct sun4i_usb_phy *phy = phy_get_drvdata(_phy);
 195
 196         if (phy->vbus)
 197                 regulator_disable(phy->vbus);
 198
 199         return 0;
 200 }
 201
 202 static struct phy_ops sun4i_usb_phy_ops = {
 203         .init           = sun4i_usb_phy_init,
 204         .exit           = sun4i_usb_phy_exit,
 205         .power_on       = sun4i_usb_phy_power_on,
 206         .power_off      = sun4i_usb_phy_power_off,
 207         .owner          = THIS_MODULE,
 208 };
 209
 210 static struct phy *sun4i_usb_phy_xlate(struct device *dev,
 211                                         struct of_phandle_args *args)
 212 {
 213         struct sun4i_usb_phy_data *data = dev_get_drvdata(dev);
 214
 215         if (WARN_ON(args->args[0] == 0 || args->args[0] >= data->num_phys))
 216                 return ERR_PTR(-ENODEV);
 217
 218         return data->phys[args->args[0]].phy;
 219 }
 220
 221 static int sun4i_usb_phy_probe(struct platform_device *pdev)
 222 {
 223         struct sun4i_usb_phy_data *data;
 224         struct device *dev = &pdev->dev;
 225         struct device_node *np = dev->of_node;
 226         struct phy_provider *phy_provider;
 227         bool dedicated_clocks;
 228         struct resource *res;
 229         int i;
 230
 231         data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL);
 232         if (!data)
 233                 return -ENOMEM;
 234
 235         mutex_init(&data->mutex);
 236
 237         if (of_device_is_compatible(np, "allwinner,sun5i-a13-usb-phy"))
 238                 data->num_phys = 2;
 239         else
 240                 data->num_phys = 3;
 241
 242         if (of_device_is_compatible(np, "allwinner,sun4i-a10-usb-phy"))
 243                 data->disc_thresh = 3;
 244         else
 245                 data->disc_thresh = 2;
 246
 247         if (of_device_is_compatible(np, "allwinner,sun6i-a31-usb-phy"))
 248                 dedicated_clocks = true;
 249         else
 250                 dedicated_clocks = false;
 251
 252         res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "phy_ctrl");
 253         data->base = devm_ioremap_resource(dev, res);
 254         if (IS_ERR(data->base))
 255                 return PTR_ERR(data->base);
 256
 257         /* Skip 0, 0 is the phy for otg which is not yet supported. */
 258         for (i = 1; i < data->num_phys; i++) {
 259                 struct sun4i_usb_phy *phy = data->phys + i;
 260                 char name[16];
 261
 262                 snprintf(name, sizeof(name), "usb%d_vbus", i);
 263                 phy->vbus = devm_regulator_get_optional(dev, name);
 264                 if (IS_ERR(phy->vbus)) {
 265                         if (PTR_ERR(phy->vbus) == -EPROBE_DEFER)
 266                                 return -EPROBE_DEFER;
 267                         phy->vbus = NULL;
 268                 }
 269
 270                 if (dedicated_clocks)
 271                         snprintf(name, sizeof(name), "usb%d_phy", i);
 272                 else
 273                         strlcpy(name, "usb_phy", sizeof(name));
 274
 275                 phy->clk = devm_clk_get(dev, name);
 276                 if (IS_ERR(phy->clk)) {
 277                         dev_err(dev, "failed to get clock %s\n", name);
 278                         return PTR_ERR(phy->clk);
 279                 }
 280
 281                 snprintf(name, sizeof(name), "usb%d_reset", i);
 282                 phy->reset = devm_reset_control_get(dev, name);
 283                 if (IS_ERR(phy->reset)) {
 284                         dev_err(dev, "failed to get reset %s\n", name);
 285                         return PTR_ERR(phy->reset);
 286                 }
 287
 288                 if (i) { /* No pmu for usbc0 */
 289                         snprintf(name, sizeof(name), "pmu%d", i);
 290                         res = platform_get_resource_byname(pdev,
 291                                                         IORESOURCE_MEM, name);
 292                         phy->pmu = devm_ioremap_resource(dev, res);
 293                         if (IS_ERR(phy->pmu))
 294                                 return PTR_ERR(phy->pmu);
 295                 }
 296
 297                 phy->phy = devm_phy_create(dev, &sun4i_usb_phy_ops, NULL);
 298                 if (IS_ERR(phy->phy)) {
 299                         dev_err(dev, "failed to create PHY %d\n", i);
 300                         return PTR_ERR(phy->phy);
 301                 }
 302
 303                 phy->index = i;
 304                 phy_set_drvdata(phy->phy, &data->phys[i]);
 305         }
 306
 307         dev_set_drvdata(dev, data);
 308         phy_provider = devm_of_phy_provider_register(dev, sun4i_usb_phy_xlate);
 309         if (IS_ERR(phy_provider))
 310                 return PTR_ERR(phy_provider);
 311
 312         return 0;
 313 }
 314
 315 static const struct of_device_id sun4i_usb_phy_of_match[] = {
 316         { .compatible = "allwinner,sun4i-a10-usb-phy" },
 317         { .compatible = "allwinner,sun5i-a13-usb-phy" },
 318         { .compatible = "allwinner,sun6i-a31-usb-phy" },
 319         { .compatible = "allwinner,sun7i-a20-usb-phy" },
 320         { },
 321 };
 322 MODULE_DEVICE_TABLE(of, sun4i_usb_phy_of_match);
 323
 324 static struct platform_driver sun4i_usb_phy_driver = {
 325         .probe  = sun4i_usb_phy_probe,
 326         .driver = {
 327                 .of_match_table = sun4i_usb_phy_of_match,
 328                 .name  = "sun4i-usb-phy",
 329                 .owner = THIS_MODULE,
 330         }
 331 };
 332 module_platform_driver(sun4i_usb_phy_driver);
 333
 334 MODULE_DESCRIPTION("Allwinner sun4i USB phy driver");
 335 MODULE_AUTHOR("Hans de Goede <hdegoede@redhat.com>");
 336 MODULE_LICENSE("GPL v2");