drivers/phy/marvell/phy-mmp3-usb.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2011 Marvell International Ltd. All rights reserved.
   4  * Copyright (C) 2018,2019 Lubomir Rintel <lkundrak@v3.sk>
   5  */
   6
   7 #include <linux/delay.h>
   8 #include <linux/io.h>
   9 #include <linux/module.h>
  10 #include <linux/phy/phy.h>
  11 #include <linux/platform_device.h>
  12 #include <linux/soc/mmp/cputype.h>
  13
  14 #define USB2_PLL_REG0           0x4
  15 #define USB2_PLL_REG1           0x8
  16 #define USB2_TX_REG0            0x10
  17 #define USB2_TX_REG1            0x14
  18 #define USB2_TX_REG2            0x18
  19 #define USB2_RX_REG0            0x20
  20 #define USB2_RX_REG1            0x24
  21 #define USB2_RX_REG2            0x28
  22 #define USB2_ANA_REG0           0x30
  23 #define USB2_ANA_REG1           0x34
  24 #define USB2_ANA_REG2           0x38
  25 #define USB2_DIG_REG0           0x3C
  26 #define USB2_DIG_REG1           0x40
  27 #define USB2_DIG_REG2           0x44
  28 #define USB2_DIG_REG3           0x48
  29 #define USB2_TEST_REG0          0x4C
  30 #define USB2_TEST_REG1          0x50
  31 #define USB2_TEST_REG2          0x54
  32 #define USB2_CHARGER_REG0       0x58
  33 #define USB2_OTG_REG0           0x5C
  34 #define USB2_PHY_MON0           0x60
  35 #define USB2_RESETVE_REG0       0x64
  36 #define USB2_ICID_REG0          0x78
  37 #define USB2_ICID_REG1          0x7C
  38
  39 /* USB2_PLL_REG0 */
  40
  41 /* This is for Ax stepping */
  42 #define USB2_PLL_FBDIV_SHIFT_MMP3               0
  43 #define USB2_PLL_FBDIV_MASK_MMP3                (0xFF << 0)
  44
  45 #define USB2_PLL_REFDIV_SHIFT_MMP3              8
  46 #define USB2_PLL_REFDIV_MASK_MMP3               (0xF << 8)
  47
  48 #define USB2_PLL_VDD12_SHIFT_MMP3               12
  49 #define USB2_PLL_VDD18_SHIFT_MMP3               14
  50
  51 /* This is for B0 stepping */
  52 #define USB2_PLL_FBDIV_SHIFT_MMP3_B0            0
  53 #define USB2_PLL_REFDIV_SHIFT_MMP3_B0           9
  54 #define USB2_PLL_VDD18_SHIFT_MMP3_B0            14
  55 #define USB2_PLL_FBDIV_MASK_MMP3_B0             0x01FF
  56 #define USB2_PLL_REFDIV_MASK_MMP3_B0            0x3E00
  57
  58 #define USB2_PLL_CAL12_SHIFT_MMP3               0
  59 #define USB2_PLL_CALI12_MASK_MMP3               (0x3 << 0)
  60
  61 #define USB2_PLL_VCOCAL_START_SHIFT_MMP3        2
  62
  63 #define USB2_PLL_KVCO_SHIFT_MMP3                4
  64 #define USB2_PLL_KVCO_MASK_MMP3                 (0x7<<4)
  65
  66 #define USB2_PLL_ICP_SHIFT_MMP3                 8
  67 #define USB2_PLL_ICP_MASK_MMP3                  (0x7<<8)
  68
  69 #define USB2_PLL_LOCK_BYPASS_SHIFT_MMP3         12
  70
  71 #define USB2_PLL_PU_PLL_SHIFT_MMP3              13
  72 #define USB2_PLL_PU_PLL_MASK                    (0x1 << 13)
  73
  74 #define USB2_PLL_READY_MASK_MMP3                (0x1 << 15)
  75
  76 /* USB2_TX_REG0 */
  77 #define USB2_TX_IMPCAL_VTH_SHIFT_MMP3           8
  78 #define USB2_TX_IMPCAL_VTH_MASK_MMP3            (0x7 << 8)
  79
  80 #define USB2_TX_RCAL_START_SHIFT_MMP3           13
  81
  82 /* USB2_TX_REG1 */
  83 #define USB2_TX_CK60_PHSEL_SHIFT_MMP3           0
  84 #define USB2_TX_CK60_PHSEL_MASK_MMP3            (0xf << 0)
  85
  86 #define USB2_TX_AMP_SHIFT_MMP3                  4
  87 #define USB2_TX_AMP_MASK_MMP3                   (0x7 << 4)
  88
  89 #define USB2_TX_VDD12_SHIFT_MMP3                8
  90 #define USB2_TX_VDD12_MASK_MMP3                 (0x3 << 8)
  91
  92 /* USB2_TX_REG2 */
  93 #define USB2_TX_DRV_SLEWRATE_SHIFT              10
  94
  95 /* USB2_RX_REG0 */
  96 #define USB2_RX_SQ_THRESH_SHIFT_MMP3            4
  97 #define USB2_RX_SQ_THRESH_MASK_MMP3             (0xf << 4)
  98
  99 #define USB2_RX_SQ_LENGTH_SHIFT_MMP3            10
 100 #define USB2_RX_SQ_LENGTH_MASK_MMP3             (0x3 << 10)
 101
 102 /* USB2_ANA_REG1*/
 103 #define USB2_ANA_PU_ANA_SHIFT_MMP3              14
 104
 105 /* USB2_OTG_REG0 */
 106 #define USB2_OTG_PU_OTG_SHIFT_MMP3              3
 107
 108 struct mmp3_usb_phy {
 109         struct phy *phy;
 110         void __iomem *base;
 111 };
 112
 113 static unsigned int u2o_get(void __iomem *base, unsigned int offset)
 114 {
 115         return readl_relaxed(base + offset);
 116 }
 117
 118 static void u2o_set(void __iomem *base, unsigned int offset,
 119                 unsigned int value)
 120 {
 121         u32 reg;
 122
 123         reg = readl_relaxed(base + offset);
 124         reg |= value;
 125         writel_relaxed(reg, base + offset);
 126         readl_relaxed(base + offset);
 127 }
 128
 129 static void u2o_clear(void __iomem *base, unsigned int offset,
 130                 unsigned int value)
 131 {
 132         u32 reg;
 133
 134         reg = readl_relaxed(base + offset);
 135         reg &= ~value;
 136         writel_relaxed(reg, base + offset);
 137         readl_relaxed(base + offset);
 138 }
 139
 140 static int mmp3_usb_phy_init(struct phy *phy)
 141 {
 142         struct mmp3_usb_phy *mmp3_usb_phy = phy_get_drvdata(phy);
 143         void __iomem *base = mmp3_usb_phy->base;
 144
 145         if (cpu_is_mmp3_a0()) {
 146                 u2o_clear(base, USB2_PLL_REG0, (USB2_PLL_FBDIV_MASK_MMP3
 147                         | USB2_PLL_REFDIV_MASK_MMP3));
 148                 u2o_set(base, USB2_PLL_REG0,
 149                         0xd << USB2_PLL_REFDIV_SHIFT_MMP3
 150                         | 0xf0 << USB2_PLL_FBDIV_SHIFT_MMP3);
 151         } else if (cpu_is_mmp3_b0()) {
 152                 u2o_clear(base, USB2_PLL_REG0, USB2_PLL_REFDIV_MASK_MMP3_B0
 153                         | USB2_PLL_FBDIV_MASK_MMP3_B0);
 154                 u2o_set(base, USB2_PLL_REG0,
 155                         0xd << USB2_PLL_REFDIV_SHIFT_MMP3_B0
 156                         | 0xf0 << USB2_PLL_FBDIV_SHIFT_MMP3_B0);
 157         } else {
 158                 dev_err(&phy->dev, "unsupported silicon revision\n");
 159                 return -ENODEV;
 160         }
 161
 162         u2o_clear(base, USB2_PLL_REG1, USB2_PLL_PU_PLL_MASK
 163                 | USB2_PLL_ICP_MASK_MMP3
 164                 | USB2_PLL_KVCO_MASK_MMP3
 165                 | USB2_PLL_CALI12_MASK_MMP3);
 166         u2o_set(base, USB2_PLL_REG1, 1 << USB2_PLL_PU_PLL_SHIFT_MMP3
 167                 | 1 << USB2_PLL_LOCK_BYPASS_SHIFT_MMP3
 168                 | 3 << USB2_PLL_ICP_SHIFT_MMP3
 169                 | 3 << USB2_PLL_KVCO_SHIFT_MMP3
 170                 | 3 << USB2_PLL_CAL12_SHIFT_MMP3);
 171
 172         u2o_clear(base, USB2_TX_REG0, USB2_TX_IMPCAL_VTH_MASK_MMP3);
 173         u2o_set(base, USB2_TX_REG0, 2 << USB2_TX_IMPCAL_VTH_SHIFT_MMP3);
 174
 175         u2o_clear(base, USB2_TX_REG1, USB2_TX_VDD12_MASK_MMP3
 176                 | USB2_TX_AMP_MASK_MMP3
 177                 | USB2_TX_CK60_PHSEL_MASK_MMP3);
 178         u2o_set(base, USB2_TX_REG1, 3 << USB2_TX_VDD12_SHIFT_MMP3
 179                 | 4 << USB2_TX_AMP_SHIFT_MMP3
 180                 | 4 << USB2_TX_CK60_PHSEL_SHIFT_MMP3);
 181
 182         u2o_clear(base, USB2_TX_REG2, 3 << USB2_TX_DRV_SLEWRATE_SHIFT);
 183         u2o_set(base, USB2_TX_REG2, 2 << USB2_TX_DRV_SLEWRATE_SHIFT);
 184
 185         u2o_clear(base, USB2_RX_REG0, USB2_RX_SQ_THRESH_MASK_MMP3);
 186         u2o_set(base, USB2_RX_REG0, 0xa << USB2_RX_SQ_THRESH_SHIFT_MMP3);
 187
 188         u2o_set(base, USB2_ANA_REG1, 0x1 << USB2_ANA_PU_ANA_SHIFT_MMP3);
 189
 190         u2o_set(base, USB2_OTG_REG0, 0x1 << USB2_OTG_PU_OTG_SHIFT_MMP3);
 191
 192         return 0;
 193 }
 194
 195 static int mmp3_usb_phy_calibrate(struct phy *phy)
 196 {
 197         struct mmp3_usb_phy *mmp3_usb_phy = phy_get_drvdata(phy);
 198         void __iomem *base = mmp3_usb_phy->base;
 199         int loops;
 200
 201         /*
 202          * PLL VCO and TX Impedance Calibration Timing:
 203          *
 204          *                _____________________________________
 205          * PU  __________|
 206          *                        _____________________________
 207          * VCOCAL START _________|
 208          *                                 ___
 209          * REG_RCAL_START ________________|   |________|_______
 210          *               | 200us | 400us  | 40| 400us  | USB PHY READY
 211          */
 212
 213         udelay(200);
 214         u2o_set(base, USB2_PLL_REG1, 1 << USB2_PLL_VCOCAL_START_SHIFT_MMP3);
 215         udelay(400);
 216         u2o_set(base, USB2_TX_REG0, 1 << USB2_TX_RCAL_START_SHIFT_MMP3);
 217         udelay(40);
 218         u2o_clear(base, USB2_TX_REG0, 1 << USB2_TX_RCAL_START_SHIFT_MMP3);
 219         udelay(400);
 220
 221         loops = 0;
 222         while ((u2o_get(base, USB2_PLL_REG1) & USB2_PLL_READY_MASK_MMP3) == 0) {
 223                 mdelay(1);
 224                 loops++;
 225                 if (loops > 100) {
 226                         dev_err(&phy->dev, "PLL_READY not set after 100mS.\n");
 227                         return -ETIMEDOUT;
 228                 }
 229         }
 230
 231         return 0;
 232 }
 233
 234 static const struct phy_ops mmp3_usb_phy_ops = {
 235         .init           = mmp3_usb_phy_init,
 236         .calibrate      = mmp3_usb_phy_calibrate,
 237         .owner          = THIS_MODULE,
 238 };
 239
 240 static const struct of_device_id mmp3_usb_phy_of_match[] = {
 241         { .compatible = "marvell,mmp3-usb-phy", },
 242         { },
 243 };
 244 MODULE_DEVICE_TABLE(of, mmp3_usb_phy_of_match);
 245
 246 static int mmp3_usb_phy_probe(struct platform_device *pdev)
 247 {
 248         struct device *dev = &pdev->dev;
 249         struct mmp3_usb_phy *mmp3_usb_phy;
 250         struct phy_provider *provider;
 251
 252         mmp3_usb_phy = devm_kzalloc(dev, sizeof(*mmp3_usb_phy), GFP_KERNEL);
 253         if (!mmp3_usb_phy)
 254                 return -ENOMEM;
 255
 256         mmp3_usb_phy->base = devm_platform_ioremap_resource(pdev, 0);
 257         if (IS_ERR(mmp3_usb_phy->base)) {
 258                 dev_err(dev, "failed to remap PHY regs\n");
 259                 return PTR_ERR(mmp3_usb_phy->base);
 260         }
 261
 262         mmp3_usb_phy->phy = devm_phy_create(dev, NULL, &mmp3_usb_phy_ops);
 263         if (IS_ERR(mmp3_usb_phy->phy)) {
 264                 dev_err(dev, "failed to create PHY\n");
 265                 return PTR_ERR(mmp3_usb_phy->phy);
 266         }
 267
 268         phy_set_drvdata(mmp3_usb_phy->phy, mmp3_usb_phy);
 269         provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 270         if (IS_ERR(provider)) {
 271                 dev_err(dev, "failed to register PHY provider\n");
 272                 return PTR_ERR(provider);
 273         }
 274
 275         return 0;
 276 }
 277
 278 static struct platform_driver mmp3_usb_phy_driver = {
 279         .probe          = mmp3_usb_phy_probe,
 280         .driver         = {
 281                 .name   = "mmp3-usb-phy",
 282                 .of_match_table = mmp3_usb_phy_of_match,
 283         },
 284 };
 285 module_platform_driver(mmp3_usb_phy_driver);
 286
 287 MODULE_AUTHOR("Lubomir Rintel <lkundrak@v3.sk>");
 288 MODULE_DESCRIPTION("Marvell MMP3 USB PHY Driver");
 289 MODULE_LICENSE("GPL v2");