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path: root/drivers/scsi/ufs/ufs-mediatek.c
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Diffstat (limited to 'drivers/scsi/ufs/ufs-mediatek.c')
-rw-r--r--drivers/scsi/ufs/ufs-mediatek.c368
1 files changed, 368 insertions, 0 deletions
diff --git a/drivers/scsi/ufs/ufs-mediatek.c b/drivers/scsi/ufs/ufs-mediatek.c
new file mode 100644
index 000000000000..0f6ff33ce52e
--- /dev/null
+++ b/drivers/scsi/ufs/ufs-mediatek.c
@@ -0,0 +1,368 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2019 MediaTek Inc.
+ * Authors:
+ * Stanley Chu <stanley.chu@mediatek.com>
+ * Peter Wang <peter.wang@mediatek.com>
+ */
+
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/phy/phy.h>
+#include <linux/platform_device.h>
+
+#include "ufshcd.h"
+#include "ufshcd-pltfrm.h"
+#include "unipro.h"
+#include "ufs-mediatek.h"
+
+static void ufs_mtk_cfg_unipro_cg(struct ufs_hba *hba, bool enable)
+{
+ u32 tmp;
+
+ if (enable) {
+ ufshcd_dme_get(hba,
+ UIC_ARG_MIB(VS_SAVEPOWERCONTROL), &tmp);
+ tmp = tmp |
+ (1 << RX_SYMBOL_CLK_GATE_EN) |
+ (1 << SYS_CLK_GATE_EN) |
+ (1 << TX_CLK_GATE_EN);
+ ufshcd_dme_set(hba,
+ UIC_ARG_MIB(VS_SAVEPOWERCONTROL), tmp);
+
+ ufshcd_dme_get(hba,
+ UIC_ARG_MIB(VS_DEBUGCLOCKENABLE), &tmp);
+ tmp = tmp & ~(1 << TX_SYMBOL_CLK_REQ_FORCE);
+ ufshcd_dme_set(hba,
+ UIC_ARG_MIB(VS_DEBUGCLOCKENABLE), tmp);
+ } else {
+ ufshcd_dme_get(hba,
+ UIC_ARG_MIB(VS_SAVEPOWERCONTROL), &tmp);
+ tmp = tmp & ~((1 << RX_SYMBOL_CLK_GATE_EN) |
+ (1 << SYS_CLK_GATE_EN) |
+ (1 << TX_CLK_GATE_EN));
+ ufshcd_dme_set(hba,
+ UIC_ARG_MIB(VS_SAVEPOWERCONTROL), tmp);
+
+ ufshcd_dme_get(hba,
+ UIC_ARG_MIB(VS_DEBUGCLOCKENABLE), &tmp);
+ tmp = tmp | (1 << TX_SYMBOL_CLK_REQ_FORCE);
+ ufshcd_dme_set(hba,
+ UIC_ARG_MIB(VS_DEBUGCLOCKENABLE), tmp);
+ }
+}
+
+static int ufs_mtk_bind_mphy(struct ufs_hba *hba)
+{
+ struct ufs_mtk_host *host = ufshcd_get_variant(hba);
+ struct device *dev = hba->dev;
+ struct device_node *np = dev->of_node;
+ int err = 0;
+
+ host->mphy = devm_of_phy_get_by_index(dev, np, 0);
+
+ if (host->mphy == ERR_PTR(-EPROBE_DEFER)) {
+ /*
+ * UFS driver might be probed before the phy driver does.
+ * In that case we would like to return EPROBE_DEFER code.
+ */
+ err = -EPROBE_DEFER;
+ dev_info(dev,
+ "%s: required phy hasn't probed yet. err = %d\n",
+ __func__, err);
+ } else if (IS_ERR(host->mphy)) {
+ err = PTR_ERR(host->mphy);
+ dev_info(dev, "%s: PHY get failed %d\n", __func__, err);
+ }
+
+ if (err)
+ host->mphy = NULL;
+
+ return err;
+}
+
+/**
+ * ufs_mtk_setup_clocks - enables/disable clocks
+ * @hba: host controller instance
+ * @on: If true, enable clocks else disable them.
+ * @status: PRE_CHANGE or POST_CHANGE notify
+ *
+ * Returns 0 on success, non-zero on failure.
+ */
+static int ufs_mtk_setup_clocks(struct ufs_hba *hba, bool on,
+ enum ufs_notify_change_status status)
+{
+ struct ufs_mtk_host *host = ufshcd_get_variant(hba);
+ int ret = -EINVAL;
+
+ /*
+ * In case ufs_mtk_init() is not yet done, simply ignore.
+ * This ufs_mtk_setup_clocks() shall be called from
+ * ufs_mtk_init() after init is done.
+ */
+ if (!host)
+ return 0;
+
+ switch (status) {
+ case PRE_CHANGE:
+ if (!on)
+ ret = phy_power_off(host->mphy);
+ break;
+ case POST_CHANGE:
+ if (on)
+ ret = phy_power_on(host->mphy);
+ break;
+ }
+
+ return ret;
+}
+
+/**
+ * ufs_mtk_init - find other essential mmio bases
+ * @hba: host controller instance
+ *
+ * Binds PHY with controller and powers up PHY enabling clocks
+ * and regulators.
+ *
+ * Returns -EPROBE_DEFER if binding fails, returns negative error
+ * on phy power up failure and returns zero on success.
+ */
+static int ufs_mtk_init(struct ufs_hba *hba)
+{
+ struct ufs_mtk_host *host;
+ struct device *dev = hba->dev;
+ int err = 0;
+
+ host = devm_kzalloc(dev, sizeof(*host), GFP_KERNEL);
+ if (!host) {
+ err = -ENOMEM;
+ dev_info(dev, "%s: no memory for mtk ufs host\n", __func__);
+ goto out;
+ }
+
+ host->hba = hba;
+ ufshcd_set_variant(hba, host);
+
+ err = ufs_mtk_bind_mphy(hba);
+ if (err)
+ goto out_variant_clear;
+
+ /*
+ * ufshcd_vops_init() is invoked after
+ * ufshcd_setup_clock(true) in ufshcd_hba_init() thus
+ * phy clock setup is skipped.
+ *
+ * Enable phy clocks specifically here.
+ */
+ ufs_mtk_setup_clocks(hba, true, POST_CHANGE);
+
+ goto out;
+
+out_variant_clear:
+ ufshcd_set_variant(hba, NULL);
+out:
+ return err;
+}
+
+static int ufs_mtk_pre_pwr_change(struct ufs_hba *hba,
+ struct ufs_pa_layer_attr *dev_max_params,
+ struct ufs_pa_layer_attr *dev_req_params)
+{
+ struct ufs_dev_params host_cap;
+ int ret;
+
+ host_cap.tx_lanes = UFS_MTK_LIMIT_NUM_LANES_TX;
+ host_cap.rx_lanes = UFS_MTK_LIMIT_NUM_LANES_RX;
+ host_cap.hs_rx_gear = UFS_MTK_LIMIT_HSGEAR_RX;
+ host_cap.hs_tx_gear = UFS_MTK_LIMIT_HSGEAR_TX;
+ host_cap.pwm_rx_gear = UFS_MTK_LIMIT_PWMGEAR_RX;
+ host_cap.pwm_tx_gear = UFS_MTK_LIMIT_PWMGEAR_TX;
+ host_cap.rx_pwr_pwm = UFS_MTK_LIMIT_RX_PWR_PWM;
+ host_cap.tx_pwr_pwm = UFS_MTK_LIMIT_TX_PWR_PWM;
+ host_cap.rx_pwr_hs = UFS_MTK_LIMIT_RX_PWR_HS;
+ host_cap.tx_pwr_hs = UFS_MTK_LIMIT_TX_PWR_HS;
+ host_cap.hs_rate = UFS_MTK_LIMIT_HS_RATE;
+ host_cap.desired_working_mode =
+ UFS_MTK_LIMIT_DESIRED_MODE;
+
+ ret = ufshcd_get_pwr_dev_param(&host_cap,
+ dev_max_params,
+ dev_req_params);
+ if (ret) {
+ pr_info("%s: failed to determine capabilities\n",
+ __func__);
+ }
+
+ return ret;
+}
+
+static int ufs_mtk_pwr_change_notify(struct ufs_hba *hba,
+ enum ufs_notify_change_status stage,
+ struct ufs_pa_layer_attr *dev_max_params,
+ struct ufs_pa_layer_attr *dev_req_params)
+{
+ int ret = 0;
+
+ switch (stage) {
+ case PRE_CHANGE:
+ ret = ufs_mtk_pre_pwr_change(hba, dev_max_params,
+ dev_req_params);
+ break;
+ case POST_CHANGE:
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static int ufs_mtk_pre_link(struct ufs_hba *hba)
+{
+ int ret;
+ u32 tmp;
+
+ /* disable deep stall */
+ ret = ufshcd_dme_get(hba, UIC_ARG_MIB(VS_SAVEPOWERCONTROL), &tmp);
+ if (ret)
+ return ret;
+
+ tmp &= ~(1 << 6);
+
+ ret = ufshcd_dme_set(hba, UIC_ARG_MIB(VS_SAVEPOWERCONTROL), tmp);
+
+ return ret;
+}
+
+static int ufs_mtk_post_link(struct ufs_hba *hba)
+{
+ /* disable device LCC */
+ ufshcd_dme_set(hba, UIC_ARG_MIB(PA_LOCAL_TX_LCC_ENABLE), 0);
+
+ /* enable unipro clock gating feature */
+ ufs_mtk_cfg_unipro_cg(hba, true);
+
+ return 0;
+}
+
+static int ufs_mtk_link_startup_notify(struct ufs_hba *hba,
+ enum ufs_notify_change_status stage)
+{
+ int ret = 0;
+
+ switch (stage) {
+ case PRE_CHANGE:
+ ret = ufs_mtk_pre_link(hba);
+ break;
+ case POST_CHANGE:
+ ret = ufs_mtk_post_link(hba);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+ return ret;
+}
+
+static int ufs_mtk_suspend(struct ufs_hba *hba, enum ufs_pm_op pm_op)
+{
+ struct ufs_mtk_host *host = ufshcd_get_variant(hba);
+
+ if (ufshcd_is_link_hibern8(hba))
+ phy_power_off(host->mphy);
+
+ return 0;
+}
+
+static int ufs_mtk_resume(struct ufs_hba *hba, enum ufs_pm_op pm_op)
+{
+ struct ufs_mtk_host *host = ufshcd_get_variant(hba);
+
+ if (ufshcd_is_link_hibern8(hba))
+ phy_power_on(host->mphy);
+
+ return 0;
+}
+
+/**
+ * struct ufs_hba_mtk_vops - UFS MTK specific variant operations
+ *
+ * The variant operations configure the necessary controller and PHY
+ * handshake during initialization.
+ */
+static struct ufs_hba_variant_ops ufs_hba_mtk_vops = {
+ .name = "mediatek.ufshci",
+ .init = ufs_mtk_init,
+ .setup_clocks = ufs_mtk_setup_clocks,
+ .link_startup_notify = ufs_mtk_link_startup_notify,
+ .pwr_change_notify = ufs_mtk_pwr_change_notify,
+ .suspend = ufs_mtk_suspend,
+ .resume = ufs_mtk_resume,
+};
+
+/**
+ * ufs_mtk_probe - probe routine of the driver
+ * @pdev: pointer to Platform device handle
+ *
+ * Return zero for success and non-zero for failure
+ */
+static int ufs_mtk_probe(struct platform_device *pdev)
+{
+ int err;
+ struct device *dev = &pdev->dev;
+
+ /* perform generic probe */
+ err = ufshcd_pltfrm_init(pdev, &ufs_hba_mtk_vops);
+ if (err)
+ dev_info(dev, "probe failed %d\n", err);
+
+ return err;
+}
+
+/**
+ * ufs_mtk_remove - set driver_data of the device to NULL
+ * @pdev: pointer to platform device handle
+ *
+ * Always return 0
+ */
+static int ufs_mtk_remove(struct platform_device *pdev)
+{
+ struct ufs_hba *hba = platform_get_drvdata(pdev);
+
+ pm_runtime_get_sync(&(pdev)->dev);
+ ufshcd_remove(hba);
+ return 0;
+}
+
+static const struct of_device_id ufs_mtk_of_match[] = {
+ { .compatible = "mediatek,mt8183-ufshci"},
+ {},
+};
+
+static const struct dev_pm_ops ufs_mtk_pm_ops = {
+ .suspend = ufshcd_pltfrm_suspend,
+ .resume = ufshcd_pltfrm_resume,
+ .runtime_suspend = ufshcd_pltfrm_runtime_suspend,
+ .runtime_resume = ufshcd_pltfrm_runtime_resume,
+ .runtime_idle = ufshcd_pltfrm_runtime_idle,
+};
+
+static struct platform_driver ufs_mtk_pltform = {
+ .probe = ufs_mtk_probe,
+ .remove = ufs_mtk_remove,
+ .shutdown = ufshcd_pltfrm_shutdown,
+ .driver = {
+ .name = "ufshcd-mtk",
+ .pm = &ufs_mtk_pm_ops,
+ .of_match_table = ufs_mtk_of_match,
+ },
+};
+
+MODULE_AUTHOR("Stanley Chu <stanley.chu@mediatek.com>");
+MODULE_AUTHOR("Peter Wang <peter.wang@mediatek.com>");
+MODULE_DESCRIPTION("MediaTek UFS Host Driver");
+MODULE_LICENSE("GPL v2");
+
+module_platform_driver(ufs_mtk_pltform);
generated by cgit v1.2.3 (git 2.25.1) at 2024-04-27 00:14:23 +0000