+++ /dev/null
-From f482010825813e19023f0a231616c78521aef834 Mon Sep 17 00:00:00 2001
-From: William Qiu <william.qiu@starfivetech.com>
-Date: Fri, 3 Feb 2023 16:19:12 +0800
-Subject: [PATCH 31/95] mmc: starfive: Add sdio/emmc driver support
-
-Add sdio/emmc driver support for StarFive JH7110 soc.
-
-Tested-by: Conor Dooley <conor.dooley@microchip.com>
-Signed-off-by: William Qiu <william.qiu@starfivetech.com>
----
- drivers/mmc/host/Kconfig | 10 ++
- drivers/mmc/host/Makefile | 1 +
- drivers/mmc/host/dw_mmc-starfive.c | 185 +++++++++++++++++++++++++++++
- 3 files changed, 196 insertions(+)
- create mode 100644 drivers/mmc/host/dw_mmc-starfive.c
-
-diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
-index fb1062a6394c..b87262503403 100644
---- a/drivers/mmc/host/Kconfig
-+++ b/drivers/mmc/host/Kconfig
-@@ -871,6 +871,16 @@ config MMC_DW_ROCKCHIP
- Synopsys DesignWare Memory Card Interface driver. Select this option
- for platforms based on RK3066, RK3188 and RK3288 SoC's.
-
-+config MMC_DW_STARFIVE
-+ tristate "StarFive specific extensions for Synopsys DW Memory Card Interface"
-+ depends on SOC_STARFIVE
-+ depends on MMC_DW
-+ select MMC_DW_PLTFM
-+ help
-+ This selects support for StarFive JH7110 SoC specific extensions to the
-+ Synopsys DesignWare Memory Card Interface driver. Select this option
-+ for platforms based on StarFive JH7110 SoC.
-+
- config MMC_SH_MMCIF
- tristate "SuperH Internal MMCIF support"
- depends on SUPERH || ARCH_RENESAS || COMPILE_TEST
-diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile
-index 4e4ceb32c4b4..32c0e5564b9a 100644
---- a/drivers/mmc/host/Makefile
-+++ b/drivers/mmc/host/Makefile
-@@ -56,6 +56,7 @@ obj-$(CONFIG_MMC_DW_HI3798CV200) += dw_mmc-hi3798cv200.o
- obj-$(CONFIG_MMC_DW_K3) += dw_mmc-k3.o
- obj-$(CONFIG_MMC_DW_PCI) += dw_mmc-pci.o
- obj-$(CONFIG_MMC_DW_ROCKCHIP) += dw_mmc-rockchip.o
-+obj-$(CONFIG_MMC_DW_STARFIVE) += dw_mmc-starfive.o
- obj-$(CONFIG_MMC_SH_MMCIF) += sh_mmcif.o
- obj-$(CONFIG_MMC_JZ4740) += jz4740_mmc.o
- obj-$(CONFIG_MMC_VUB300) += vub300.o
-diff --git a/drivers/mmc/host/dw_mmc-starfive.c b/drivers/mmc/host/dw_mmc-starfive.c
-new file mode 100644
-index 000000000000..e4d0bdb40d12
---- /dev/null
-+++ b/drivers/mmc/host/dw_mmc-starfive.c
-@@ -0,0 +1,185 @@
-+// SPDX-License-Identifier: GPL-2.0
-+/*
-+ * StarFive Designware Mobile Storage Host Controller Driver
-+ *
-+ * Copyright (c) 2022 StarFive Technology Co., Ltd.
-+ */
-+
-+#include <linux/clk.h>
-+#include <linux/delay.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/regmap.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 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 rise_point = -1, fall_point = -1;
-+ int err, prev_err;
-+ int i;
-+ bool found = 0;
-+ u32 regval;
-+
-+ /* Use grade as the max delay chain, and use the rise_point and
-+ * fall_point to ensure the best sampling point of a data input
-+ * signals.
-+ */
-+ 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)
-+ rise_point = i;
-+ }
-+
-+ if (rise_point != -1 && fall_point != -1)
-+ goto tuning_out;
-+
-+ prev_err = err;
-+ err = 0;
-+ }
-+
-+tuning_out:
-+ if (found) {
-+ if (rise_point == -1)
-+ rise_point = 0;
-+ if (fall_point == -1)
-+ fall_point = grade - 1;
-+ if (fall_point < rise_point) {
-+ if ((rise_point + fall_point) >
-+ (grade - 1))
-+ i = fall_point / 2;
-+ else
-+ i = (rise_point + grade - 1) / 2;
-+ } else {
-+ i = (rise_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;
-+ mci_writel(host, RINTSTS, ALL_INT_CLR);
-+
-+ dev_info(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_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,syscon", 3, 0, &args);
-+ if (ret) {
-+ dev_err(host->dev, "Failed to parse starfive,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 = {
-+ .common_caps = MMC_CAP_CMD23,
-+ .set_ios = dw_mci_starfive_set_ios,
-+ .parse_dt = dw_mci_starfive_parse_dt,
-+ .execute_tuning = dw_mci_starfive_execute_tuning,
-+};
-+
-+static const struct of_device_id dw_mci_starfive_match[] = {
-+ { .compatible = "starfive,jh7110-mmc",
-+ .data = &starfive_data },
-+ {},
-+};
-+MODULE_DEVICE_TABLE(of, dw_mci_starfive_match);
-+
-+static int dw_mci_starfive_probe(struct platform_device *pdev)
-+{
-+ return dw_mci_pltfm_register(pdev, &starfive_data);;
-+}
-+
-+static struct platform_driver dw_mci_starfive_driver = {
-+ .probe = dw_mci_starfive_probe,
-+ .remove = dw_mci_pltfm_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");
-+MODULE_ALIAS("platform:dwmmc_starfive");
---
-2.20.1
-
projects / openwrt / staging / wigyori.git / blobdiff