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

   1 /*
   2  * Copyright (c) 2014, The Linux Foundation. All rights reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 and
   6  * only version 2 as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  */
  13
  14 #include <linux/io.h>
  15 #include <linux/kernel.h>
  16 #include <linux/module.h>
  17 #include <linux/of.h>
  18 #include <linux/time.h>
  19 #include <linux/delay.h>
  20 #include <linux/clk.h>
  21 #include <linux/slab.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/phy/phy.h>
  24
  25 /* PHY registers */
  26 #define UNIPHY_PLL_REFCLK_CFG           0x000
  27 #define UNIPHY_PLL_PWRGEN_CFG           0x014
  28 #define UNIPHY_PLL_GLB_CFG              0x020
  29 #define UNIPHY_PLL_SDM_CFG0             0x038
  30 #define UNIPHY_PLL_SDM_CFG1             0x03C
  31 #define UNIPHY_PLL_SDM_CFG2             0x040
  32 #define UNIPHY_PLL_SDM_CFG3             0x044
  33 #define UNIPHY_PLL_SDM_CFG4             0x048
  34 #define UNIPHY_PLL_SSC_CFG0             0x04C
  35 #define UNIPHY_PLL_SSC_CFG1             0x050
  36 #define UNIPHY_PLL_SSC_CFG2             0x054
  37 #define UNIPHY_PLL_SSC_CFG3             0x058
  38 #define UNIPHY_PLL_LKDET_CFG0           0x05C
  39 #define UNIPHY_PLL_LKDET_CFG1           0x060
  40 #define UNIPHY_PLL_LKDET_CFG2           0x064
  41 #define UNIPHY_PLL_CAL_CFG0             0x06C
  42 #define UNIPHY_PLL_CAL_CFG8             0x08C
  43 #define UNIPHY_PLL_CAL_CFG9             0x090
  44 #define UNIPHY_PLL_CAL_CFG10            0x094
  45 #define UNIPHY_PLL_CAL_CFG11            0x098
  46 #define UNIPHY_PLL_STATUS               0x0C0
  47
  48 #define SATA_PHY_SER_CTRL               0x100
  49 #define SATA_PHY_TX_DRIV_CTRL0          0x104
  50 #define SATA_PHY_TX_DRIV_CTRL1          0x108
  51 #define SATA_PHY_TX_IMCAL0              0x11C
  52 #define SATA_PHY_TX_IMCAL2              0x124
  53 #define SATA_PHY_RX_IMCAL0              0x128
  54 #define SATA_PHY_EQUAL                  0x13C
  55 #define SATA_PHY_OOB_TERM               0x144
  56 #define SATA_PHY_CDR_CTRL0              0x148
  57 #define SATA_PHY_CDR_CTRL1              0x14C
  58 #define SATA_PHY_CDR_CTRL2              0x150
  59 #define SATA_PHY_CDR_CTRL3              0x154
  60 #define SATA_PHY_PI_CTRL0               0x168
  61 #define SATA_PHY_POW_DWN_CTRL0          0x180
  62 #define SATA_PHY_POW_DWN_CTRL1          0x184
  63 #define SATA_PHY_TX_DATA_CTRL           0x188
  64 #define SATA_PHY_ALIGNP                 0x1A4
  65 #define SATA_PHY_TX_IMCAL_STAT          0x1E4
  66 #define SATA_PHY_RX_IMCAL_STAT          0x1E8
  67
  68 #define UNIPHY_PLL_LOCK         BIT(0)
  69 #define SATA_PHY_TX_CAL         BIT(0)
  70 #define SATA_PHY_RX_CAL         BIT(0)
  71
  72 /* default timeout set to 1 sec */
  73 #define TIMEOUT_MS              10000
  74 #define DELAY_INTERVAL_US       100
  75
  76 struct qcom_apq8064_sata_phy {
  77         void __iomem *mmio;
  78         struct clk *cfg_clk;
  79         struct device *dev;
  80 };
  81
  82 /* Helper function to do poll and timeout */
  83 static int read_poll_timeout(void __iomem *addr, u32 mask)
  84 {
  85         unsigned long timeout = jiffies + msecs_to_jiffies(TIMEOUT_MS);
  86
  87         do {
  88                 if (readl_relaxed(addr) & mask)
  89                         return 0;
  90
  91                  usleep_range(DELAY_INTERVAL_US, DELAY_INTERVAL_US + 50);
  92         } while (!time_after(jiffies, timeout));
  93
  94         return (readl_relaxed(addr) & mask) ? 0 : -ETIMEDOUT;
  95 }
  96
  97 static int qcom_apq8064_sata_phy_init(struct phy *generic_phy)
  98 {
  99         struct qcom_apq8064_sata_phy *phy = phy_get_drvdata(generic_phy);
 100         void __iomem *base = phy->mmio;
 101         int ret = 0;
 102
 103         /* SATA phy initialization */
 104         writel_relaxed(0x01, base + SATA_PHY_SER_CTRL);
 105         writel_relaxed(0xB1, base + SATA_PHY_POW_DWN_CTRL0);
 106         /* Make sure the power down happens before power up */
 107         mb();
 108         usleep_range(10, 60);
 109
 110         writel_relaxed(0x01, base + SATA_PHY_POW_DWN_CTRL0);
 111         writel_relaxed(0x3E, base + SATA_PHY_POW_DWN_CTRL1);
 112         writel_relaxed(0x01, base + SATA_PHY_RX_IMCAL0);
 113         writel_relaxed(0x01, base + SATA_PHY_TX_IMCAL0);
 114         writel_relaxed(0x02, base + SATA_PHY_TX_IMCAL2);
 115
 116         /* Write UNIPHYPLL registers to configure PLL */
 117         writel_relaxed(0x04, base + UNIPHY_PLL_REFCLK_CFG);
 118         writel_relaxed(0x00, base + UNIPHY_PLL_PWRGEN_CFG);
 119
 120         writel_relaxed(0x0A, base + UNIPHY_PLL_CAL_CFG0);
 121         writel_relaxed(0xF3, base + UNIPHY_PLL_CAL_CFG8);
 122         writel_relaxed(0x01, base + UNIPHY_PLL_CAL_CFG9);
 123         writel_relaxed(0xED, base + UNIPHY_PLL_CAL_CFG10);
 124         writel_relaxed(0x02, base + UNIPHY_PLL_CAL_CFG11);
 125
 126         writel_relaxed(0x36, base + UNIPHY_PLL_SDM_CFG0);
 127         writel_relaxed(0x0D, base + UNIPHY_PLL_SDM_CFG1);
 128         writel_relaxed(0xA3, base + UNIPHY_PLL_SDM_CFG2);
 129         writel_relaxed(0xF0, base + UNIPHY_PLL_SDM_CFG3);
 130         writel_relaxed(0x00, base + UNIPHY_PLL_SDM_CFG4);
 131
 132         writel_relaxed(0x19, base + UNIPHY_PLL_SSC_CFG0);
 133         writel_relaxed(0xE1, base + UNIPHY_PLL_SSC_CFG1);
 134         writel_relaxed(0x00, base + UNIPHY_PLL_SSC_CFG2);
 135         writel_relaxed(0x11, base + UNIPHY_PLL_SSC_CFG3);
 136
 137         writel_relaxed(0x04, base + UNIPHY_PLL_LKDET_CFG0);
 138         writel_relaxed(0xFF, base + UNIPHY_PLL_LKDET_CFG1);
 139
 140         writel_relaxed(0x02, base + UNIPHY_PLL_GLB_CFG);
 141         /* make sure global config LDO power down happens before power up */
 142         mb();
 143
 144         writel_relaxed(0x03, base + UNIPHY_PLL_GLB_CFG);
 145         writel_relaxed(0x05, base + UNIPHY_PLL_LKDET_CFG2);
 146
 147         /* PLL Lock wait */
 148         ret = read_poll_timeout(base + UNIPHY_PLL_STATUS, UNIPHY_PLL_LOCK);
 149         if (ret) {
 150                 dev_err(phy->dev, "poll timeout UNIPHY_PLL_STATUS\n");
 151                 return ret;
 152         }
 153
 154         /* TX Calibration */
 155         ret = read_poll_timeout(base + SATA_PHY_TX_IMCAL_STAT, SATA_PHY_TX_CAL);
 156         if (ret) {
 157                 dev_err(phy->dev, "poll timeout SATA_PHY_TX_IMCAL_STAT\n");
 158                 return ret;
 159         }
 160
 161         /* RX Calibration */
 162         ret = read_poll_timeout(base + SATA_PHY_RX_IMCAL_STAT, SATA_PHY_RX_CAL);
 163         if (ret) {
 164                 dev_err(phy->dev, "poll timeout SATA_PHY_RX_IMCAL_STAT\n");
 165                 return ret;
 166         }
 167
 168         /* SATA phy calibrated succesfully, power up to functional mode */
 169         writel_relaxed(0x3E, base + SATA_PHY_POW_DWN_CTRL1);
 170         writel_relaxed(0x01, base + SATA_PHY_RX_IMCAL0);
 171         writel_relaxed(0x01, base + SATA_PHY_TX_IMCAL0);
 172
 173         writel_relaxed(0x00, base + SATA_PHY_POW_DWN_CTRL1);
 174         writel_relaxed(0x59, base + SATA_PHY_CDR_CTRL0);
 175         writel_relaxed(0x04, base + SATA_PHY_CDR_CTRL1);
 176         writel_relaxed(0x00, base + SATA_PHY_CDR_CTRL2);
 177         writel_relaxed(0x00, base + SATA_PHY_PI_CTRL0);
 178         writel_relaxed(0x00, base + SATA_PHY_CDR_CTRL3);
 179         writel_relaxed(0x01, base + SATA_PHY_POW_DWN_CTRL0);
 180
 181         writel_relaxed(0x11, base + SATA_PHY_TX_DATA_CTRL);
 182         writel_relaxed(0x43, base + SATA_PHY_ALIGNP);
 183         writel_relaxed(0x04, base + SATA_PHY_OOB_TERM);
 184
 185         writel_relaxed(0x01, base + SATA_PHY_EQUAL);
 186         writel_relaxed(0x09, base + SATA_PHY_TX_DRIV_CTRL0);
 187         writel_relaxed(0x09, base + SATA_PHY_TX_DRIV_CTRL1);
 188
 189         return 0;
 190 }
 191
 192 static int qcom_apq8064_sata_phy_exit(struct phy *generic_phy)
 193 {
 194         struct qcom_apq8064_sata_phy *phy = phy_get_drvdata(generic_phy);
 195         void __iomem *base = phy->mmio;
 196
 197         /* Power down PHY */
 198         writel_relaxed(0xF8, base + SATA_PHY_POW_DWN_CTRL0);
 199         writel_relaxed(0xFE, base + SATA_PHY_POW_DWN_CTRL1);
 200
 201         /* Power down PLL block */
 202         writel_relaxed(0x00, base + UNIPHY_PLL_GLB_CFG);
 203
 204         return 0;
 205 }
 206
 207 static struct phy_ops qcom_apq8064_sata_phy_ops = {
 208         .init           = qcom_apq8064_sata_phy_init,
 209         .exit           = qcom_apq8064_sata_phy_exit,
 210         .owner          = THIS_MODULE,
 211 };
 212
 213 static int qcom_apq8064_sata_phy_probe(struct platform_device *pdev)
 214 {
 215         struct qcom_apq8064_sata_phy *phy;
 216         struct device *dev = &pdev->dev;
 217         struct resource *res;
 218         struct phy_provider *phy_provider;
 219         struct phy *generic_phy;
 220         int ret;
 221
 222         phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
 223         if (!phy)
 224                 return -ENOMEM;
 225
 226         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 227         phy->mmio = devm_ioremap_resource(dev, res);
 228         if (IS_ERR(phy->mmio))
 229                 return PTR_ERR(phy->mmio);
 230
 231         generic_phy = devm_phy_create(dev, NULL, &qcom_apq8064_sata_phy_ops);
 232         if (IS_ERR(generic_phy)) {
 233                 dev_err(dev, "%s: failed to create phy\n", __func__);
 234                 return PTR_ERR(generic_phy);
 235         }
 236
 237         phy->dev = dev;
 238         phy_set_drvdata(generic_phy, phy);
 239         platform_set_drvdata(pdev, phy);
 240
 241         phy->cfg_clk = devm_clk_get(dev, "cfg");
 242         if (IS_ERR(phy->cfg_clk)) {
 243                 dev_err(dev, "Failed to get sata cfg clock\n");
 244                 return PTR_ERR(phy->cfg_clk);
 245         }
 246
 247         ret = clk_prepare_enable(phy->cfg_clk);
 248         if (ret)
 249                 return ret;
 250
 251         phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
 252         if (IS_ERR(phy_provider)) {
 253                 clk_disable_unprepare(phy->cfg_clk);
 254                 dev_err(dev, "%s: failed to register phy\n", __func__);
 255                 return PTR_ERR(phy_provider);
 256         }
 257
 258         return 0;
 259 }
 260
 261 static int qcom_apq8064_sata_phy_remove(struct platform_device *pdev)
 262 {
 263         struct qcom_apq8064_sata_phy *phy = platform_get_drvdata(pdev);
 264
 265         clk_disable_unprepare(phy->cfg_clk);
 266
 267         return 0;
 268 }
 269
 270 static const struct of_device_id qcom_apq8064_sata_phy_of_match[] = {
 271         { .compatible = "qcom,apq8064-sata-phy" },
 272         { },
 273 };
 274 MODULE_DEVICE_TABLE(of, qcom_apq8064_sata_phy_of_match);
 275
 276 static struct platform_driver qcom_apq8064_sata_phy_driver = {
 277         .probe  = qcom_apq8064_sata_phy_probe,
 278         .remove = qcom_apq8064_sata_phy_remove,
 279         .driver = {
 280                 .name   = "qcom-apq8064-sata-phy",
 281                 .of_match_table = qcom_apq8064_sata_phy_of_match,
 282         }
 283 };
 284 module_platform_driver(qcom_apq8064_sata_phy_driver);
 285
 286 MODULE_DESCRIPTION("QCOM apq8064 SATA PHY driver");
 287 MODULE_LICENSE("GPL v2");