phy: qcom-ufs: add support for 20nm phy
This change adds a support for a 20nm qcom-ufs phy that is required in
platforms that use ufs-qcom controller.
Signed-off-by: Yaniv Gardi <ygardi@codeaurora.org>
Reviewed-by: Dov Levenglick <dovl@codeaurora.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/drivers/phy/phy-qcom-ufs-qmp-20nm.c b/drivers/phy/phy-qcom-ufs-qmp-20nm.c
new file mode 100644
index 0000000..8332f96
--- /dev/null
+++ b/drivers/phy/phy-qcom-ufs-qmp-20nm.c
@@ -0,0 +1,257 @@
+/*
+ * Copyright (c) 2013-2015, Linux Foundation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 and
+ * only version 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ */
+
+#include "phy-qcom-ufs-qmp-20nm.h"
+
+#define UFS_PHY_NAME "ufs_phy_qmp_20nm"
+
+static
+int ufs_qcom_phy_qmp_20nm_phy_calibrate(struct ufs_qcom_phy *ufs_qcom_phy,
+ bool is_rate_B)
+{
+ struct ufs_qcom_phy_calibration *tbl_A, *tbl_B;
+ int tbl_size_A, tbl_size_B;
+ u8 major = ufs_qcom_phy->host_ctrl_rev_major;
+ u16 minor = ufs_qcom_phy->host_ctrl_rev_minor;
+ u16 step = ufs_qcom_phy->host_ctrl_rev_step;
+ int err;
+
+ if ((major == 0x1) && (minor == 0x002) && (step == 0x0000)) {
+ tbl_size_A = ARRAY_SIZE(phy_cal_table_rate_A_1_2_0);
+ tbl_A = phy_cal_table_rate_A_1_2_0;
+ } else if ((major == 0x1) && (minor == 0x003) && (step == 0x0000)) {
+ tbl_size_A = ARRAY_SIZE(phy_cal_table_rate_A_1_3_0);
+ tbl_A = phy_cal_table_rate_A_1_3_0;
+ } else {
+ dev_err(ufs_qcom_phy->dev, "%s: Unknown UFS-PHY version, no calibration values\n",
+ __func__);
+ err = -ENODEV;
+ goto out;
+ }
+
+ tbl_size_B = ARRAY_SIZE(phy_cal_table_rate_B);
+ tbl_B = phy_cal_table_rate_B;
+
+ err = ufs_qcom_phy_calibrate(ufs_qcom_phy, tbl_A, tbl_size_A,
+ tbl_B, tbl_size_B, is_rate_B);
+
+ if (err)
+ dev_err(ufs_qcom_phy->dev, "%s: ufs_qcom_phy_calibrate() failed %d\n",
+ __func__, err);
+
+out:
+ return err;
+}
+
+static
+void ufs_qcom_phy_qmp_20nm_advertise_quirks(struct ufs_qcom_phy *phy_common)
+{
+ phy_common->quirks =
+ UFS_QCOM_PHY_QUIRK_HIBERN8_EXIT_AFTER_PHY_PWR_COLLAPSE;
+}
+
+static int ufs_qcom_phy_qmp_20nm_init(struct phy *generic_phy)
+{
+ struct ufs_qcom_phy_qmp_20nm *phy = phy_get_drvdata(generic_phy);
+ struct ufs_qcom_phy *phy_common = &phy->common_cfg;
+ int err = 0;
+
+ err = ufs_qcom_phy_init_clks(generic_phy, phy_common);
+ if (err) {
+ dev_err(phy_common->dev, "%s: ufs_qcom_phy_init_clks() failed %d\n",
+ __func__, err);
+ goto out;
+ }
+
+ err = ufs_qcom_phy_init_vregulators(generic_phy, phy_common);
+ if (err) {
+ dev_err(phy_common->dev, "%s: ufs_qcom_phy_init_vregulators() failed %d\n",
+ __func__, err);
+ goto out;
+ }
+
+ ufs_qcom_phy_qmp_20nm_advertise_quirks(phy_common);
+
+out:
+ return err;
+}
+
+static
+void ufs_qcom_phy_qmp_20nm_power_control(struct ufs_qcom_phy *phy, bool val)
+{
+ bool hibern8_exit_after_pwr_collapse = phy->quirks &
+ UFS_QCOM_PHY_QUIRK_HIBERN8_EXIT_AFTER_PHY_PWR_COLLAPSE;
+
+ if (val) {
+ writel_relaxed(0x1, phy->mmio + UFS_PHY_POWER_DOWN_CONTROL);
+ /*
+ * Before any transactions involving PHY, ensure PHY knows
+ * that it's analog rail is powered ON.
+ */
+ mb();
+
+ if (hibern8_exit_after_pwr_collapse) {
+ /*
+ * Give atleast 1us delay after restoring PHY analog
+ * power.
+ */
+ usleep_range(1, 2);
+ writel_relaxed(0x0A, phy->mmio +
+ QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
+ writel_relaxed(0x08, phy->mmio +
+ QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
+ /*
+ * Make sure workaround is deactivated before proceeding
+ * with normal PHY operations.
+ */
+ mb();
+ }
+ } else {
+ if (hibern8_exit_after_pwr_collapse) {
+ writel_relaxed(0x0A, phy->mmio +
+ QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
+ writel_relaxed(0x02, phy->mmio +
+ QSERDES_COM_SYSCLK_EN_SEL_TXBAND);
+ /*
+ * Make sure that above workaround is activated before
+ * PHY analog power collapse.
+ */
+ mb();
+ }
+
+ writel_relaxed(0x0, phy->mmio + UFS_PHY_POWER_DOWN_CONTROL);
+ /*
+ * ensure that PHY knows its PHY analog rail is going
+ * to be powered down
+ */
+ mb();
+ }
+}
+
+static
+void ufs_qcom_phy_qmp_20nm_set_tx_lane_enable(struct ufs_qcom_phy *phy, u32 val)
+{
+ writel_relaxed(val & UFS_PHY_TX_LANE_ENABLE_MASK,
+ phy->mmio + UFS_PHY_TX_LANE_ENABLE);
+ mb();
+}
+
+static inline void ufs_qcom_phy_qmp_20nm_start_serdes(struct ufs_qcom_phy *phy)
+{
+ u32 tmp;
+
+ tmp = readl_relaxed(phy->mmio + UFS_PHY_PHY_START);
+ tmp &= ~MASK_SERDES_START;
+ tmp |= (1 << OFFSET_SERDES_START);
+ writel_relaxed(tmp, phy->mmio + UFS_PHY_PHY_START);
+ mb();
+}
+
+static int ufs_qcom_phy_qmp_20nm_is_pcs_ready(struct ufs_qcom_phy *phy_common)
+{
+ int err = 0;
+ u32 val;
+
+ err = readl_poll_timeout(phy_common->mmio + UFS_PHY_PCS_READY_STATUS,
+ val, (val & MASK_PCS_READY), 10, 1000000);
+ if (err)
+ dev_err(phy_common->dev, "%s: poll for pcs failed err = %d\n",
+ __func__, err);
+ return err;
+}
+
+static struct phy_ops ufs_qcom_phy_qmp_20nm_phy_ops = {
+ .init = ufs_qcom_phy_qmp_20nm_init,
+ .exit = ufs_qcom_phy_exit,
+ .power_on = ufs_qcom_phy_power_on,
+ .power_off = ufs_qcom_phy_power_off,
+ .owner = THIS_MODULE,
+};
+
+static struct ufs_qcom_phy_specific_ops phy_20nm_ops = {
+ .calibrate_phy = ufs_qcom_phy_qmp_20nm_phy_calibrate,
+ .start_serdes = ufs_qcom_phy_qmp_20nm_start_serdes,
+ .is_physical_coding_sublayer_ready = ufs_qcom_phy_qmp_20nm_is_pcs_ready,
+ .set_tx_lane_enable = ufs_qcom_phy_qmp_20nm_set_tx_lane_enable,
+ .power_control = ufs_qcom_phy_qmp_20nm_power_control,
+};
+
+static int ufs_qcom_phy_qmp_20nm_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct phy *generic_phy;
+ struct ufs_qcom_phy_qmp_20nm *phy;
+ int err = 0;
+
+ phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
+ if (!phy) {
+ dev_err(dev, "%s: failed to allocate phy\n", __func__);
+ err = -ENOMEM;
+ goto out;
+ }
+
+ generic_phy = ufs_qcom_phy_generic_probe(pdev, &phy->common_cfg,
+ &ufs_qcom_phy_qmp_20nm_phy_ops, &phy_20nm_ops);
+
+ if (!generic_phy) {
+ dev_err(dev, "%s: ufs_qcom_phy_generic_probe() failed\n",
+ __func__);
+ err = -EIO;
+ goto out;
+ }
+
+ phy_set_drvdata(generic_phy, phy);
+
+ strlcpy(phy->common_cfg.name, UFS_PHY_NAME,
+ sizeof(phy->common_cfg.name));
+
+out:
+ return err;
+}
+
+static int ufs_qcom_phy_qmp_20nm_remove(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct phy *generic_phy = to_phy(dev);
+ struct ufs_qcom_phy *ufs_qcom_phy = get_ufs_qcom_phy(generic_phy);
+ int err = 0;
+
+ err = ufs_qcom_phy_remove(generic_phy, ufs_qcom_phy);
+ if (err)
+ dev_err(dev, "%s: ufs_qcom_phy_remove failed = %d\n",
+ __func__, err);
+
+ return err;
+}
+
+static const struct of_device_id ufs_qcom_phy_qmp_20nm_of_match[] = {
+ {.compatible = "qcom,ufs-phy-qmp-20nm"},
+ {},
+};
+MODULE_DEVICE_TABLE(of, ufs_qcom_phy_qmp_20nm_of_match);
+
+static struct platform_driver ufs_qcom_phy_qmp_20nm_driver = {
+ .probe = ufs_qcom_phy_qmp_20nm_probe,
+ .remove = ufs_qcom_phy_qmp_20nm_remove,
+ .driver = {
+ .of_match_table = ufs_qcom_phy_qmp_20nm_of_match,
+ .name = "ufs_qcom_phy_qmp_20nm",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_platform_driver(ufs_qcom_phy_qmp_20nm_driver);
+
+MODULE_DESCRIPTION("Universal Flash Storage (UFS) QCOM PHY QMP 20nm");
+MODULE_LICENSE("GPL v2");