From 1f1e2db1d7475419a63daddbda73f0ba5ed82148 Mon Sep 17 00:00:00 2001 From: William Qiu Date: Fri, 9 Sep 2022 12:39:12 +0800 Subject: SDIO:starfive:Add the starfive private driver for SDIO Add the starfive private driver for SDIO Signed-off-by: William Qiu --- drivers/mmc/host/Kconfig | 9 ++ drivers/mmc/host/Makefile | 1 + drivers/mmc/host/dw_mmc-starfive.c | 225 +++++++++++++++++++++++++++++++++++++ 3 files changed, 235 insertions(+) create mode 100644 drivers/mmc/host/dw_mmc-starfive.c (limited to 'drivers/mmc') diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig index ccc148cdb5ee..be3bab209fb7 100644 --- a/drivers/mmc/host/Kconfig +++ b/drivers/mmc/host/Kconfig @@ -837,6 +837,15 @@ config MMC_DW_HI3798CV200 Synopsys DesignWare Memory Card Interface driver. Select this option for platforms based on HiSilicon Hi3798CV200 SoC. +config MMC_DW_STARFIVE + tristate "StarFive specific extensions for Synopsys DW Memory Card Interface" + 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_DW_K3 tristate "K3 specific extensions for Synopsys DW Memory Card Interface" depends on MMC_DW diff --git a/drivers/mmc/host/Makefile b/drivers/mmc/host/Makefile index 14004cc09aaa..d5270e955bd7 100644 --- a/drivers/mmc/host/Makefile +++ b/drivers/mmc/host/Makefile @@ -51,6 +51,7 @@ thunderx-mmc-objs := cavium.o cavium-thunderx.o obj-$(CONFIG_MMC_CAVIUM_THUNDERX) += thunderx-mmc.o obj-$(CONFIG_MMC_DW) += dw_mmc.o obj-$(CONFIG_MMC_DW_PLTFM) += dw_mmc-pltfm.o +obj-$(CONFIG_MMC_DW_STARFIVE) += dw_mmc-starfive.o obj-$(CONFIG_MMC_DW_BLUEFIELD) += dw_mmc-bluefield.o obj-$(CONFIG_MMC_DW_EXYNOS) += dw_mmc-exynos.o obj-$(CONFIG_MMC_DW_HI3798CV200) += dw_mmc-hi3798cv200.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..b328e237a586 --- /dev/null +++ b/drivers/mmc/host/dw_mmc-starfive.c @@ -0,0 +1,225 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright 2022 StarFive, Inc + * + * 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 +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +#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"); -- cgit v1.2.3