sdio: starfive: Add sdio/emmc driver support for StarFive

Add sdio/emmc driver support for StarFive JH7110 SoC.

Signed-off-by: William Qiu <william.qiu@starfivetech.com>

diff --git a/MAINTAINERS b/MAINTAINERS
index 9d5a266..29037f6 100644 (file)
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -19659,6 +19659,12 @@ F:     Documentation/devicetree/bindings/reset/starfive,jh7100-reset.yaml
 F:     drivers/reset/starfive/
 F:     include/dt-bindings/reset/starfive*
 
+STARFIVE JH7110 MMC/SD/SDIO DRIVER
+M:     William Qiu <william.qiu@starfivetech.com>
+S:     Maintained
+F:     Documentation/devicetree/bindings/mmc/starfive*
+F:     drivers/mmc/dw_mmc-starfive.c
+
 STATIC BRANCH/CALL
 M:     Peter Zijlstra <peterz@infradead.org>
 M:     Josh Poimboeuf <jpoimboe@kernel.org>

diff --git a/drivers/mmc/host/Kconfig b/drivers/mmc/host/Kconfig
index fb1062a..b872625 100644 (file)
--- 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 4e4ceb3..32c0e55 100644 (file)
--- 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 (file)
index 0000000..f201174
--- /dev/null
+++ b/drivers/mmc/host/dw_mmc-starfive.c
@@ -0,0 +1,177 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2022 StarFive, Inc <clivia.cai@starfivetech.com>
+ *
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/gpio.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
+#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 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;
+               mci_writel(host, RINTSTS, ALL_INT_CLR);
+
+               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_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),
+       .parse_dt = dw_mci_starfive_parse_dt,
+       .execute_tuning = dw_mci_starfive_execute_tuning,
+};
+
+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");
+MODULE_ALIAS("platform:dwmmc_starfive");