--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2018 HiSilicon Technologies Co., Ltd.
+ */
+
+#include <linux/clk.h>
+#include <linux/mfd/syscon.h>
+#include <linux/mmc/host.h>
+#include <linux/module.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
+#include <linux/regulator/consumer.h>
+
+#include "dw_mmc.h"
+#include "dw_mmc-pltfm.h"
+
+#define ALL_INT_CLR 0x1ffff
+
+struct hi3798cv200_priv {
+ struct clk *sample_clk;
+ struct clk *drive_clk;
+};
+
+static void dw_mci_hi3798cv200_set_ios(struct dw_mci *host, struct mmc_ios *ios)
+{
+ struct hi3798cv200_priv *priv = host->priv;
+ u32 val;
+
+ val = mci_readl(host, UHS_REG);
+ if (ios->timing == MMC_TIMING_MMC_DDR52 ||
+ ios->timing == MMC_TIMING_UHS_DDR50)
+ val |= SDMMC_UHS_DDR;
+ else
+ val &= ~SDMMC_UHS_DDR;
+ mci_writel(host, UHS_REG, val);
+
+ val = mci_readl(host, ENABLE_SHIFT);
+ if (ios->timing == MMC_TIMING_MMC_DDR52)
+ val |= SDMMC_ENABLE_PHASE;
+ else
+ val &= ~SDMMC_ENABLE_PHASE;
+ mci_writel(host, ENABLE_SHIFT, val);
+
+ val = mci_readl(host, DDR_REG);
+ if (ios->timing == MMC_TIMING_MMC_HS400)
+ val |= SDMMC_DDR_HS400;
+ else
+ val &= ~SDMMC_DDR_HS400;
+ mci_writel(host, DDR_REG, val);
+
+ if (ios->timing == MMC_TIMING_MMC_HS ||
+ ios->timing == MMC_TIMING_LEGACY)
+ clk_set_phase(priv->drive_clk, 180);
+ else if (ios->timing == MMC_TIMING_MMC_HS200)
+ clk_set_phase(priv->drive_clk, 135);
+}
+
+static int dw_mci_hi3798cv200_execute_tuning(struct dw_mci_slot *slot,
+ u32 opcode)
+{
+ int degrees[] = { 0, 45, 90, 135, 180, 225, 270, 315 };
+ struct dw_mci *host = slot->host;
+ struct hi3798cv200_priv *priv = host->priv;
+ int raise_point = -1, fall_point = -1;
+ int err, prev_err = -1;
+ int found = 0;
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(degrees); i++) {
+ clk_set_phase(priv->sample_clk, degrees[i]);
+ mci_writel(host, RINTSTS, ALL_INT_CLR);
+
+ err = mmc_send_tuning(slot->mmc, opcode, NULL);
+ if (!err)
+ found = 1;
+
+ if (i > 0) {
+ if (err && !prev_err)
+ fall_point = i - 1;
+ if (!err && prev_err)
+ raise_point = i;
+ }
+
+ if (raise_point != -1 && fall_point != -1)
+ goto tuning_out;
+
+ prev_err = err;
+ err = 0;
+ }
+
+tuning_out:
+ if (found) {
+ if (raise_point == -1)
+ raise_point = 0;
+ if (fall_point == -1)
+ fall_point = ARRAY_SIZE(degrees) - 1;
+ if (fall_point < raise_point) {
+ if ((raise_point + fall_point) >
+ (ARRAY_SIZE(degrees) - 1))
+ i = fall_point / 2;
+ else
+ i = (raise_point + ARRAY_SIZE(degrees) - 1) / 2;
+ } else {
+ i = (raise_point + fall_point) / 2;
+ }
+
+ clk_set_phase(priv->sample_clk, degrees[i]);
+ dev_dbg(host->dev, "Tuning clk_sample[%d, %d], set[%d]\n",
+ raise_point, fall_point, degrees[i]);
+ } else {
+ dev_err(host->dev, "No valid clk_sample shift! use default\n");
+ err = -EINVAL;
+ }
+
+ mci_writel(host, RINTSTS, ALL_INT_CLR);
+ return err;
+}
+
+static int dw_mci_hi3798cv200_init(struct dw_mci *host)
+{
+ struct hi3798cv200_priv *priv;
+ int ret;
+
+ priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ priv->sample_clk = devm_clk_get(host->dev, "ciu-sample");
+ if (IS_ERR(priv->sample_clk)) {
+ dev_err(host->dev, "failed to get ciu-sample clock\n");
+ return PTR_ERR(priv->sample_clk);
+ }
+
+ priv->drive_clk = devm_clk_get(host->dev, "ciu-drive");
+ if (IS_ERR(priv->drive_clk)) {
+ dev_err(host->dev, "failed to get ciu-drive clock\n");
+ return PTR_ERR(priv->drive_clk);
+ }
+
+ ret = clk_prepare_enable(priv->sample_clk);
+ if (ret) {
+ dev_err(host->dev, "failed to enable ciu-sample clock\n");
+ return ret;
+ }
+
+ ret = clk_prepare_enable(priv->drive_clk);
+ if (ret) {
+ dev_err(host->dev, "failed to enable ciu-drive clock\n");
+ goto disable_sample_clk;
+ }
+
+ host->priv = priv;
+ return 0;
+
+disable_sample_clk:
+ clk_disable_unprepare(priv->sample_clk);
+ return ret;
+}
+
+static const struct dw_mci_drv_data hi3798cv200_data = {
+ .init = dw_mci_hi3798cv200_init,
+ .set_ios = dw_mci_hi3798cv200_set_ios,
+ .execute_tuning = dw_mci_hi3798cv200_execute_tuning,
+};
+
+static int dw_mci_hi3798cv200_probe(struct platform_device *pdev)
+{
+ return dw_mci_pltfm_register(pdev, &hi3798cv200_data);
+}
+
+static int dw_mci_hi3798cv200_remove(struct platform_device *pdev)
+{
+ struct dw_mci *host = platform_get_drvdata(pdev);
+ struct hi3798cv200_priv *priv = host->priv;
+
+ clk_disable_unprepare(priv->drive_clk);
+ clk_disable_unprepare(priv->sample_clk);
+
+ return dw_mci_pltfm_remove(pdev);
+}
+
+static const struct of_device_id dw_mci_hi3798cv200_match[] = {
+ { .compatible = "hisilicon,hi3798cv200-dw-mshc", },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, dw_mci_hi3798cv200_match);
+static struct platform_driver dw_mci_hi3798cv200_driver = {
+ .probe = dw_mci_hi3798cv200_probe,
+ .remove = dw_mci_hi3798cv200_remove,
+ .driver = {
+ .name = "dwmmc_hi3798cv200",
+ .of_match_table = dw_mci_hi3798cv200_match,
+ },
+};
+module_platform_driver(dw_mci_hi3798cv200_driver);
+
+MODULE_DESCRIPTION("HiSilicon Hi3798CV200 Specific DW-MSHC Driver Extension");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:dwmmc_hi3798cv200");
projects / users / jedix / linux-maple.git / commitdiff