kernel/drivers/phy/phy-berlin-usb.c

   1 /*
   2  * Copyright (C) 2014 Marvell Technology Group Ltd.
   3  *
   4  * Antoine Tenart <antoine.tenart@free-electrons.com>
   5  * Jisheng Zhang <jszhang@marvell.com>
   6  *
   7  * This file is licensed under the terms of the GNU General Public
   8  * License version 2. This program is licensed "as is" without any
   9  * warranty of any kind, whether express or implied.
  10  */
  11
  12 #include <linux/gpio.h>
  13 #include <linux/io.h>
  14 #include <linux/module.h>
  15 #include <linux/of_device.h>
  16 #include <linux/of_gpio.h>
  17 #include <linux/phy/phy.h>
  18 #include <linux/platform_device.h>
  19 #include <linux/reset.h>
  20
  21 #define USB_PHY_PLL             0x04
  22 #define USB_PHY_PLL_CONTROL     0x08
  23 #define USB_PHY_TX_CTRL0        0x10
  24 #define USB_PHY_TX_CTRL1        0x14
  25 #define USB_PHY_TX_CTRL2        0x18
  26 #define USB_PHY_RX_CTRL         0x20
  27 #define USB_PHY_ANALOG          0x34
  28
  29 /* USB_PHY_PLL */
  30 #define CLK_REF_DIV(x)          ((x) << 4)
  31 #define FEEDBACK_CLK_DIV(x)     ((x) << 8)
  32
  33 /* USB_PHY_PLL_CONTROL */
  34 #define CLK_STABLE              BIT(0)
  35 #define PLL_CTRL_PIN            BIT(1)
  36 #define PLL_CTRL_REG            BIT(2)
  37 #define PLL_ON                  BIT(3)
  38 #define PHASE_OFF_TOL_125       (0x0 << 5)
  39 #define PHASE_OFF_TOL_250       BIT(5)
  40 #define KVC0_CALIB              (0x0 << 9)
  41 #define KVC0_REG_CTRL           BIT(9)
  42 #define KVC0_HIGH               (0x0 << 10)
  43 #define KVC0_LOW                (0x3 << 10)
  44 #define CLK_BLK_EN              BIT(13)
  45
  46 /* USB_PHY_TX_CTRL0 */
  47 #define EXT_HS_RCAL_EN          BIT(3)
  48 #define EXT_FS_RCAL_EN          BIT(4)
  49 #define IMPCAL_VTH_DIV(x)       ((x) << 5)
  50 #define EXT_RS_RCAL_DIV(x)      ((x) << 8)
  51 #define EXT_FS_RCAL_DIV(x)      ((x) << 12)
  52
  53 /* USB_PHY_TX_CTRL1 */
  54 #define TX_VDD15_14             (0x0 << 4)
  55 #define TX_VDD15_15             BIT(4)
  56 #define TX_VDD15_16             (0x2 << 4)
  57 #define TX_VDD15_17             (0x3 << 4)
  58 #define TX_VDD12_VDD            (0x0 << 6)
  59 #define TX_VDD12_11             BIT(6)
  60 #define TX_VDD12_12             (0x2 << 6)
  61 #define TX_VDD12_13             (0x3 << 6)
  62 #define LOW_VDD_EN              BIT(8)
  63 #define TX_OUT_AMP(x)           ((x) << 9)
  64
  65 /* USB_PHY_TX_CTRL2 */
  66 #define TX_CHAN_CTRL_REG(x)     ((x) << 0)
  67 #define DRV_SLEWRATE(x)         ((x) << 4)
  68 #define IMP_CAL_FS_HS_DLY_0     (0x0 << 6)
  69 #define IMP_CAL_FS_HS_DLY_1     BIT(6)
  70 #define IMP_CAL_FS_HS_DLY_2     (0x2 << 6)
  71 #define IMP_CAL_FS_HS_DLY_3     (0x3 << 6)
  72 #define FS_DRV_EN_MASK(x)       ((x) << 8)
  73 #define HS_DRV_EN_MASK(x)       ((x) << 12)
  74
  75 /* USB_PHY_RX_CTRL */
  76 #define PHASE_FREEZE_DLY_2_CL   (0x0 << 0)
  77 #define PHASE_FREEZE_DLY_4_CL   BIT(0)
  78 #define ACK_LENGTH_8_CL         (0x0 << 2)
  79 #define ACK_LENGTH_12_CL        BIT(2)
  80 #define ACK_LENGTH_16_CL        (0x2 << 2)
  81 #define ACK_LENGTH_20_CL        (0x3 << 2)
  82 #define SQ_LENGTH_3             (0x0 << 4)
  83 #define SQ_LENGTH_6             BIT(4)
  84 #define SQ_LENGTH_9             (0x2 << 4)
  85 #define SQ_LENGTH_12            (0x3 << 4)
  86 #define DISCON_THRESHOLD_260    (0x0 << 6)
  87 #define DISCON_THRESHOLD_270    BIT(6)
  88 #define DISCON_THRESHOLD_280    (0x2 << 6)
  89 #define DISCON_THRESHOLD_290    (0x3 << 6)
  90 #define SQ_THRESHOLD(x)         ((x) << 8)
  91 #define LPF_COEF(x)             ((x) << 12)
  92 #define INTPL_CUR_10            (0x0 << 14)
  93 #define INTPL_CUR_20            BIT(14)
  94 #define INTPL_CUR_30            (0x2 << 14)
  95 #define INTPL_CUR_40            (0x3 << 14)
  96
  97 /* USB_PHY_ANALOG */
  98 #define ANA_PWR_UP              BIT(1)
  99 #define ANA_PWR_DOWN            BIT(2)
 100 #define V2I_VCO_RATIO(x)        ((x) << 7)
 101 #define R_ROTATE_90             (0x0 << 10)
 102 #define R_ROTATE_0              BIT(10)
 103 #define MODE_TEST_EN            BIT(11)
 104 #define ANA_TEST_DC_CTRL(x)     ((x) << 12)
 105
 106 static const u32 phy_berlin_pll_dividers[] = {
 107         /* Berlin 2 */
 108         CLK_REF_DIV(0xc) | FEEDBACK_CLK_DIV(0x54),
 109         /* Berlin 2CD/Q */
 110         CLK_REF_DIV(0xc) | FEEDBACK_CLK_DIV(0x54),
 111 };
 112
 113 struct phy_berlin_usb_priv {
 114         void __iomem            *base;
 115         struct reset_control    *rst_ctrl;
 116         u32                     pll_divider;
 117 };
 118
 119 static int phy_berlin_usb_power_on(struct phy *phy)
 120 {
 121         struct phy_berlin_usb_priv *priv = phy_get_drvdata(phy);
 122
 123         reset_control_reset(priv->rst_ctrl);
 124
 125         writel(priv->pll_divider,
 126                priv->base + USB_PHY_PLL);
 127         writel(CLK_STABLE | PLL_CTRL_REG | PHASE_OFF_TOL_250 | KVC0_REG_CTRL |
 128                CLK_BLK_EN, priv->base + USB_PHY_PLL_CONTROL);
 129         writel(V2I_VCO_RATIO(0x5) | R_ROTATE_0 | ANA_TEST_DC_CTRL(0x5),
 130                priv->base + USB_PHY_ANALOG);
 131         writel(PHASE_FREEZE_DLY_4_CL | ACK_LENGTH_16_CL | SQ_LENGTH_12 |
 132                DISCON_THRESHOLD_260 | SQ_THRESHOLD(0xa) | LPF_COEF(0x2) |
 133                INTPL_CUR_30, priv->base + USB_PHY_RX_CTRL);
 134
 135         writel(TX_VDD12_13 | TX_OUT_AMP(0x3), priv->base + USB_PHY_TX_CTRL1);
 136         writel(EXT_HS_RCAL_EN | IMPCAL_VTH_DIV(0x3) | EXT_RS_RCAL_DIV(0x4),
 137                priv->base + USB_PHY_TX_CTRL0);
 138
 139         writel(EXT_HS_RCAL_EN | IMPCAL_VTH_DIV(0x3) | EXT_RS_RCAL_DIV(0x4) |
 140                EXT_FS_RCAL_DIV(0x2), priv->base + USB_PHY_TX_CTRL0);
 141
 142         writel(EXT_HS_RCAL_EN | IMPCAL_VTH_DIV(0x3) | EXT_RS_RCAL_DIV(0x4),
 143                priv->base + USB_PHY_TX_CTRL0);
 144         writel(TX_CHAN_CTRL_REG(0xf) | DRV_SLEWRATE(0x3) | IMP_CAL_FS_HS_DLY_3 |
 145                FS_DRV_EN_MASK(0xd), priv->base + USB_PHY_TX_CTRL2);
 146
 147         return 0;
 148 }
 149
 150 static struct phy_ops phy_berlin_usb_ops = {
 151         .power_on       = phy_berlin_usb_power_on,
 152         .owner          = THIS_MODULE,
 153 };
 154
 155 static const struct of_device_id phy_berlin_sata_of_match[] = {
 156         {
 157                 .compatible = "marvell,berlin2-usb-phy",
 158                 .data = &phy_berlin_pll_dividers[0],
 159         },
 160         {
 161                 .compatible = "marvell,berlin2cd-usb-phy",
 162                 .data = &phy_berlin_pll_dividers[1],
 163         },
 164         { },
 165 };
 166 MODULE_DEVICE_TABLE(of, phy_berlin_sata_of_match);
 167
 168 static int phy_berlin_usb_probe(struct platform_device *pdev)
 169 {
 170         const struct of_device_id *match =
 171                 of_match_device(phy_berlin_sata_of_match, &pdev->dev);
 172         struct phy_berlin_usb_priv *priv;
 173         struct resource *res;
 174         struct phy *phy;
 175         struct phy_provider *phy_provider;
 176
 177         priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
 178         if (!priv)
 179                 return -ENOMEM;
 180
 181         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 182         priv->base = devm_ioremap_resource(&pdev->dev, res);
 183         if (IS_ERR(priv->base))
 184                 return PTR_ERR(priv->base);
 185
 186         priv->rst_ctrl = devm_reset_control_get(&pdev->dev, NULL);
 187         if (IS_ERR(priv->rst_ctrl))
 188                 return PTR_ERR(priv->rst_ctrl);
 189
 190         priv->pll_divider = *((u32 *)match->data);
 191
 192         phy = devm_phy_create(&pdev->dev, NULL, &phy_berlin_usb_ops);
 193         if (IS_ERR(phy)) {
 194                 dev_err(&pdev->dev, "failed to create PHY\n");
 195                 return PTR_ERR(phy);
 196         }
 197
 198         platform_set_drvdata(pdev, priv);
 199         phy_set_drvdata(phy, priv);
 200
 201         phy_provider =
 202                 devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate);
 203         return PTR_ERR_OR_ZERO(phy_provider);
 204 }
 205
 206 static struct platform_driver phy_berlin_usb_driver = {
 207         .probe  = phy_berlin_usb_probe,
 208         .driver = {
 209                 .name           = "phy-berlin-usb",
 210                 .owner          = THIS_MODULE,
 211                 .of_match_table = phy_berlin_sata_of_match,
 212          },
 213 };
 214 module_platform_driver(phy_berlin_usb_driver);
 215
 216 MODULE_AUTHOR("Antoine Tenart <antoine.tenart@free-electrons.com>");
 217 MODULE_DESCRIPTION("Marvell Berlin PHY driver for USB");
 218 MODULE_LICENSE("GPL");