--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2022 StarFive, Inc <clivia.cai@starfivetech.com>
+ *
+ * THE PRESENT SOFTWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING
+ * CUSTOMERS WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER
+ * FOR THEM TO SAVE TIME. AS A RESULT, STARFIVE SHALL NOT BE HELD LIABLE
+ * FOR ANY DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY
+ * CLAIMS ARISING FROM THE CONTENT OF SUCH SOFTWARE AND/OR THE USE MADE
+ * BY CUSTOMERS OF THE CODING INFORMATION CONTAINED HEREIN IN CONNECTION
+ * WITH THEIR PRODUCTS.
+ */
+
+
+#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 <linux/gpio.h>
+#include <linux/delay.h>
+
+#include "dw_mmc.h"
+#include "dw_mmc-pltfm.h"
+
+#define ALL_INT_CLR 0x1ffff
+#define MAX_DELAY_CHAIN 32
+struct starfive_priv {
+ struct device *dev;
+ struct regmap *reg_syscon;
+ u32 syscon_offset;
+ u32 syscon_shift;
+ u32 syscon_mask;
+};
+
+static unsigned long dw_mci_starfive_caps[] = {
+ MMC_CAP_CMD23,
+ MMC_CAP_CMD23,
+ MMC_CAP_CMD23
+};
+
+static void dw_mci_starfive_set_ios(struct dw_mci *host, struct mmc_ios *ios)
+{
+ int ret;
+ unsigned int clock;
+
+ if (ios->timing == MMC_TIMING_MMC_DDR52 || ios->timing == MMC_TIMING_UHS_DDR50) {
+ clock = (ios->clock > 50000000 && ios->clock <= 52000000) ? 100000000 : ios->clock;
+ ret = clk_set_rate(host->ciu_clk, clock);
+ if (ret)
+ dev_dbg(host->dev, "Use an external frequency divider %uHz\n", ios->clock);
+ host->bus_hz = clk_get_rate(host->ciu_clk);
+ } else {
+ dev_dbg(host->dev, "Using the internal divider\n");
+ }
+}
+
+static int dw_mci_starfive_execute_tuning(struct dw_mci_slot *slot,
+ u32 opcode)
+{
+ static const int grade = MAX_DELAY_CHAIN;
+ struct dw_mci *host = slot->host;
+ struct starfive_priv *priv = host->priv;
+ int raise_point = -1, fall_point = -1;
+ int err, prev_err = -1;
+ int found = 0;
+ int i;
+ u32 regval;
+
+ for (i = 0; i < grade; i++) {
+ regval = i << priv->syscon_shift;
+ err = regmap_update_bits(priv->reg_syscon, priv->syscon_offset, priv->syscon_mask, regval);
+ if (err)
+ return err;
+ 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 = grade - 1;
+ if (fall_point < raise_point) {
+ if ((raise_point + fall_point) >
+ (grade - 1))
+ i = fall_point / 2;
+ else
+ i = (raise_point + grade - 1) / 2;
+ } else {
+ i = (raise_point + fall_point) / 2;
+ }
+
+ regval = i << priv->syscon_shift;
+ err = regmap_update_bits(priv->reg_syscon, priv->syscon_offset, priv->syscon_mask, regval);
+ if (err)
+ return err;
+ dev_dbg(host->dev, "Found valid delay chain! use it [delay=%d]\n", i);
+ } else {
+ dev_err(host->dev, "No valid delay chain! use default\n");
+ err = -EINVAL;
+ }
+
+ mci_writel(host, RINTSTS, ALL_INT_CLR);
+ return err;
+}
+
+static int dw_mci_starfive_switch_voltage(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+
+ struct dw_mci_slot *slot = mmc_priv(mmc);
+ struct dw_mci *host = slot->host;
+ u32 ret;
+
+ if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_330)
+ ret = gpio_direction_output(25, 0);
+ else if (ios->signal_voltage == MMC_SIGNAL_VOLTAGE_180)
+ ret = gpio_direction_output(25, 1);
+ if (ret)
+ return ret;
+
+ if (!IS_ERR(mmc->supply.vqmmc)) {
+ ret = mmc_regulator_set_vqmmc(mmc, ios);
+ if (ret < 0) {
+ dev_err(host->dev, "Regulator set error %d\n", ret);
+ return ret;
+ }
+ }
+
+ /* We should delay 20ms wait for timing setting finished. */
+ mdelay(20);
+ return 0;
+}
+
+static int dw_mci_starfive_parse_dt(struct dw_mci *host)
+{
+ struct of_phandle_args args;
+ struct starfive_priv *priv;
+ int ret;
+
+ priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ ret = of_parse_phandle_with_fixed_args(host->dev->of_node,
+ "starfive,sys-syscon", 3, 0, &args);
+ if (ret) {
+ dev_err(host->dev, "Failed to parse starfive,sys-syscon\n");
+ return -EINVAL;
+ }
+
+ priv->reg_syscon = syscon_node_to_regmap(args.np);
+ of_node_put(args.np);
+ if (IS_ERR(priv->reg_syscon))
+ return PTR_ERR(priv->reg_syscon);
+
+ priv->syscon_offset = args.args[0];
+ priv->syscon_shift = args.args[1];
+ priv->syscon_mask = args.args[2];
+
+ host->priv = priv;
+
+ return 0;
+}
+
+static const struct dw_mci_drv_data starfive_data = {
+ .caps = dw_mci_starfive_caps,
+ .num_caps = ARRAY_SIZE(dw_mci_starfive_caps),
+ .set_ios = dw_mci_starfive_set_ios,
+ .parse_dt = dw_mci_starfive_parse_dt,
+ .execute_tuning = dw_mci_starfive_execute_tuning,
+ .switch_voltage = dw_mci_starfive_switch_voltage,
+};
+
+static int dw_mci_starfive_probe(struct platform_device *pdev)
+{
+ return dw_mci_pltfm_register(pdev, &starfive_data);
+}
+
+static int dw_mci_starfive_remove(struct platform_device *pdev)
+{
+ return dw_mci_pltfm_remove(pdev);
+}
+
+static const struct of_device_id dw_mci_starfive_match[] = {
+ { .compatible = "starfive,jh7110-sdio", },
+ {},
+};
+
+MODULE_DEVICE_TABLE(of, dw_mci_starfive_match);
+static struct platform_driver dw_mci_starfive_driver = {
+ .probe = dw_mci_starfive_probe,
+ .remove = dw_mci_starfive_remove,
+ .driver = {
+ .name = "dwmmc_starfive",
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ .of_match_table = dw_mci_starfive_match,
+ },
+};
+module_platform_driver(dw_mci_starfive_driver);
+
+MODULE_DESCRIPTION("StarFive JH7110 Specific DW-MSHC Driver Extension");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:dwmmc_starfive");
projects / platform / kernel / linux-starfive.git / commitdiff