drivers/phy/qualcomm/phy-qcom-apq8064-sata.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Copyright (c) 2014, The Linux Foundation. All rights reserved.
   4  */
   5
   6 #include <linux/io.h>
   7 #include <linux/iopoll.h>
   8 #include <linux/kernel.h>
   9 #include <linux/module.h>
  10 #include <linux/of.h>
  11 #include <linux/time.h>
  12 #include <linux/delay.h>
  13 #include <linux/clk.h>
  14 #include <linux/slab.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/phy/phy.h>
  17
  18 /* PHY registers */
  19 #define UNIPHY_PLL_REFCLK_CFG           0x000
  20 #define UNIPHY_PLL_PWRGEN_CFG           0x014
  21 #define UNIPHY_PLL_GLB_CFG              0x020
  22 #define UNIPHY_PLL_SDM_CFG0             0x038
  23 #define UNIPHY_PLL_SDM_CFG1             0x03C
  24 #define UNIPHY_PLL_SDM_CFG2             0x040
  25 #define UNIPHY_PLL_SDM_CFG3             0x044
  26 #define UNIPHY_PLL_SDM_CFG4             0x048
  27 #define UNIPHY_PLL_SSC_CFG0             0x04C
  28 #define UNIPHY_PLL_SSC_CFG1             0x050
  29 #define UNIPHY_PLL_SSC_CFG2             0x054
  30 #define UNIPHY_PLL_SSC_CFG3             0x058
  31 #define UNIPHY_PLL_LKDET_CFG0           0x05C
  32 #define UNIPHY_PLL_LKDET_CFG1           0x060
  33 #define UNIPHY_PLL_LKDET_CFG2           0x064
  34 #define UNIPHY_PLL_CAL_CFG0             0x06C
  35 #define UNIPHY_PLL_CAL_CFG8             0x08C
  36 #define UNIPHY_PLL_CAL_CFG9             0x090
  37 #define UNIPHY_PLL_CAL_CFG10            0x094
  38 #define UNIPHY_PLL_CAL_CFG11            0x098
  39 #define UNIPHY_PLL_STATUS               0x0C0
  40
  41 #define SATA_PHY_SER_CTRL               0x100
  42 #define SATA_PHY_TX_DRIV_CTRL0          0x104
  43 #define SATA_PHY_TX_DRIV_CTRL1          0x108
  44 #define SATA_PHY_TX_IMCAL0              0x11C
  45 #define SATA_PHY_TX_IMCAL2              0x124
  46 #define SATA_PHY_RX_IMCAL0              0x128
  47 #define SATA_PHY_EQUAL                  0x13C
  48 #define SATA_PHY_OOB_TERM               0x144
  49 #define SATA_PHY_CDR_CTRL0              0x148
  50 #define SATA_PHY_CDR_CTRL1              0x14C
  51 #define SATA_PHY_CDR_CTRL2              0x150
  52 #define SATA_PHY_CDR_CTRL3              0x154
  53 #define SATA_PHY_PI_CTRL0               0x168
  54 #define SATA_PHY_POW_DWN_CTRL0          0x180
  55 #define SATA_PHY_POW_DWN_CTRL1          0x184
  56 #define SATA_PHY_TX_DATA_CTRL           0x188
  57 #define SATA_PHY_ALIGNP                 0x1A4
  58 #define SATA_PHY_TX_IMCAL_STAT          0x1E4
  59 #define SATA_PHY_RX_IMCAL_STAT          0x1E8
  60
  61 #define UNIPHY_PLL_LOCK         BIT(0)
  62 #define SATA_PHY_TX_CAL         BIT(0)
  63 #define SATA_PHY_RX_CAL         BIT(0)
  64
  65 /* default timeout set to 1 sec */
  66 #define TIMEOUT_MS              10000
  67 #define DELAY_INTERVAL_US       100
  68
  69 struct qcom_apq8064_sata_phy {
  70         void __iomem *mmio;
  71         struct clk *cfg_clk;
  72         struct device *dev;
  73 };
  74
  75 /* Helper function to do poll and timeout */
  76 static int poll_timeout(void __iomem *addr, u32 mask)
  77 {
  78         u32 val;
  79
  80         return readl_relaxed_poll_timeout(addr, val, (val & mask),
  81                                         DELAY_INTERVAL_US, TIMEOUT_MS * 1000);
  82 }
  83
  84 static int qcom_apq8064_sata_phy_init(struct phy *generic_phy)
  85 {
  86         struct qcom_apq8064_sata_phy *phy = phy_get_drvdata(generic_phy);
  87         void __iomem *base = phy->mmio;
  88         int ret = 0;
  89
  90         /* SATA phy initialization */
  91         writel_relaxed(0x01, base + SATA_PHY_SER_CTRL);
  92         writel_relaxed(0xB1, base + SATA_PHY_POW_DWN_CTRL0);
  93         /* Make sure the power down happens before power up */
  94         mb();
  95         usleep_range(10, 60);
  96
  97         writel_relaxed(0x01, base + SATA_PHY_POW_DWN_CTRL0);
  98         writel_relaxed(0x3E, base + SATA_PHY_POW_DWN_CTRL1);
  99         writel_relaxed(0x01, base + SATA_PHY_RX_IMCAL0);
 100         writel_relaxed(0x01, base + SATA_PHY_TX_IMCAL0);
 101         writel_relaxed(0x02, base + SATA_PHY_TX_IMCAL2);
 102
 103         /* Write UNIPHYPLL registers to configure PLL */
 104         writel_relaxed(0x04, base + UNIPHY_PLL_REFCLK_CFG);
 105         writel_relaxed(0x00, base + UNIPHY_PLL_PWRGEN_CFG);
 106
 107         writel_relaxed(0x0A, base + UNIPHY_PLL_CAL_CFG0);
 108         writel_relaxed(0xF3, base + UNIPHY_PLL_CAL_CFG8);
 109         writel_relaxed(0x01, base + UNIPHY_PLL_CAL_CFG9);
 110         writel_relaxed(0xED, base + UNIPHY_PLL_CAL_CFG10);
 111         writel_relaxed(0x02, base + UNIPHY_PLL_CAL_CFG11);
 112
 113         writel_relaxed(0x36, base + UNIPHY_PLL_SDM_CFG0);
 114         writel_relaxed(0x0D, base + UNIPHY_PLL_SDM_CFG1);
 115         writel_relaxed(0xA3, base + UNIPHY_PLL_SDM_CFG2);
 116         writel_relaxed(0xF0, base + UNIPHY_PLL_SDM_CFG3);
 117         writel_relaxed(0x00, base + UNIPHY_PLL_SDM_CFG4);
 118
 119         writel_relaxed(0x19, base + UNIPHY_PLL_SSC_CFG0);
 120         writel_relaxed(0xE1, base + UNIPHY_PLL_SSC_CFG1);
 121         writel_relaxed(0x00, base + UNIPHY_PLL_SSC_CFG2);
 122         writel_relaxed(0x11, base + UNIPHY_PLL_SSC_CFG3);
 123
 124         writel_relaxed(0x04, base + UNIPHY_PLL_LKDET_CFG0);
 125         writel_relaxed(0xFF, base + UNIPHY_PLL_LKDET_CFG1);
 126
 127         writel_relaxed(0x02, base + UNIPHY_PLL_GLB_CFG);
 128         /* make sure global config LDO power down happens before power up */
 129         mb();
 130
 131         writel_relaxed(0x03, base + UNIPHY_PLL_GLB_CFG);
 132         writel_relaxed(0x05, base + UNIPHY_PLL_LKDET_CFG2);
 133
 134         /* PLL Lock wait */
 135         ret = poll_timeout(base + UNIPHY_PLL_STATUS, UNIPHY_PLL_LOCK);
 136         if (ret) {
 137                 dev_err(phy->dev, "poll timeout UNIPHY_PLL_STATUS\n");
 138                 return ret;
 139         }
 140
 141         /* TX Calibration */
 142         ret = poll_timeout(base + SATA_PHY_TX_IMCAL_STAT, SATA_PHY_TX_CAL);
 143         if (ret) {
 144                 dev_err(phy->dev, "poll timeout SATA_PHY_TX_IMCAL_STAT\n");
 145                 return ret;
 146         }
 147
 148         /* RX Calibration */
 149         ret = poll_timeout(base + SATA_PHY_RX_IMCAL_STAT, SATA_PHY_RX_CAL);
 150         if (ret) {
 151                 dev_err(phy->dev, "poll timeout SATA_PHY_RX_IMCAL_STAT\n");
 152                 return ret;
 153         }
 154
 155         /* SATA phy calibrated succesfully, power up to functional mode */
 156         writel_relaxed(0x3E, base + SATA_PHY_POW_DWN_CTRL1);
 157         writel_relaxed(0x01, base + SATA_PHY_RX_IMCAL0);
 158         writel_relaxed(0x01, base + SATA_PHY_TX_IMCAL0);
 159
 160         writel_relaxed(0x00, base + SATA_PHY_POW_DWN_CTRL1);
 161         writel_relaxed(0x59, base + SATA_PHY_CDR_CTRL0);
 162         writel_relaxed(0x04, base + SATA_PHY_CDR_CTRL1);
 163         writel_relaxed(0x00, base + SATA_PHY_CDR_CTRL2);
 164         writel_relaxed(0x00, base + SATA_PHY_PI_CTRL0);
 165         writel_relaxed(0x00, base + SATA_PHY_CDR_CTRL3);
 166         writel_relaxed(0x01, base + SATA_PHY_POW_DWN_CTRL0);
 167
 168         writel_relaxed(0x11, base + SATA_PHY_TX_DATA_CTRL);
 169         writel_relaxed(0x43, base + SATA_PHY_ALIGNP);
 170         writel_relaxed(0x04, base + SATA_PHY_OOB_TERM);
 171
 172         writel_relaxed(0x01, base + SATA_PHY_EQUAL);
 173         writel_relaxed(0x09, base + SATA_PHY_TX_DRIV_CTRL0);
 174         writel_relaxed(0x09, base + SATA_PHY_TX_DRIV_CTRL1);
 175
 176         return 0;
 177 }
 178
 179 static int qcom_apq8064_sata_phy_exit(struct phy *generic_phy)
 180 {
 181         struct qcom_apq8064_sata_phy *phy = phy_get_drvdata(generic_phy);
 182         void __iomem *base = phy->mmio;
 183
 184         /* Power down PHY */
 185         writel_relaxed(0xF8, base + SATA_PHY_POW_DWN_CTRL0);
 186         writel_relaxed(0xFE, base + SATA_PHY_POW_DWN_CTRL1);
 187
 188         /* Power down PLL block */
 189         writel_relaxed(0x00, base + UNIPHY_PLL_GLB_CFG);
 190
 191         return 0;
 192 }
 193
 194 static const struct phy_ops qcom_apq8064_sata_phy_ops = {
 195         .init           = qcom_apq8064_sata_phy_init,
 196         .exit           = qcom_apq8064_sata_phy_exit,
 197         .owner          = THIS_MODULE,
 198 };
 199
 200 static int qcom_apq8064_sata_phy_probe(struct platform_device *pdev)
 201 {
 202         struct qcom_apq8064_sata_phy *phy;
 203         struct device *dev = &pdev->dev;
 204         struct phy_provider *phy_provider;
 205         struct phy *generic_phy;
 206         int ret;
 207
 208         phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
 209         if (!phy)
 210                 return -ENOMEM;
 211
 212         phy->mmio = devm_platform_ioremap_resource(pdev, 0);
 213         if (IS_ERR(phy->mmio))
 214                 return PTR_ERR(phy->mmio);
 215
 216         generic_phy = devm_phy_create(dev, NULL, &qcom_apq8064_sata_phy_ops);
 217         if (IS_ERR(generic_phy)) {
 218                 dev_err(dev, "%s: failed to create phy\n", __func__);
 219                 return PTR_ERR(generic_phy);
 220         }
 221
 222         phy->dev = dev;
 223         phy_set_drvdata(generic_phy, phy);
 224         platform_set_drvdata(pdev, phy);
 225
 226         phy->cfg_clk = devm_clk_get(dev, "cfg");
 227         if (IS_ERR(phy->cfg_clk)) {
 228                 dev_err(dev, "Failed to get sata cfg clock\n");
 229                 return PTR_ERR(phy->cfg_clk);
 230         }
 231
 232         ret = clk_prepare_enable(phy->cfg_clk);
 233         if (ret)
 234                 return ret;
 235
 236         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 237         if (IS_ERR(phy_provider)) {
 238                 clk_disable_unprepare(phy->cfg_clk);
 239                 dev_err(dev, "%s: failed to register phy\n", __func__);
 240                 return PTR_ERR(phy_provider);
 241         }
 242
 243         return 0;
 244 }
 245
 246 static int qcom_apq8064_sata_phy_remove(struct platform_device *pdev)
 247 {
 248         struct qcom_apq8064_sata_phy *phy = platform_get_drvdata(pdev);
 249
 250         clk_disable_unprepare(phy->cfg_clk);
 251
 252         return 0;
 253 }
 254
 255 static const struct of_device_id qcom_apq8064_sata_phy_of_match[] = {
 256         { .compatible = "qcom,apq8064-sata-phy" },
 257         { },
 258 };
 259 MODULE_DEVICE_TABLE(of, qcom_apq8064_sata_phy_of_match);
 260
 261 static struct platform_driver qcom_apq8064_sata_phy_driver = {
 262         .probe  = qcom_apq8064_sata_phy_probe,
 263         .remove = qcom_apq8064_sata_phy_remove,
 264         .driver = {
 265                 .name   = "qcom-apq8064-sata-phy",
 266                 .of_match_table = qcom_apq8064_sata_phy_of_match,
 267         }
 268 };
 269 module_platform_driver(qcom_apq8064_sata_phy_driver);
 270
 271 MODULE_DESCRIPTION("QCOM apq8064 SATA PHY driver");
 272 MODULE_LICENSE("GPL v2");