target/linux/starfive/patches-6.1/0108-mmc-starfive-Add-sdio-emmc-driver-support.patch

   1 From ee990c664fad993275b2615d0ff06af5d04922f0 Mon Sep 17 00:00:00 2001
   2 From: William Qiu <william.qiu@starfivetech.com>
   3 Date: Wed, 15 Feb 2023 19:32:47 +0800
   4 Subject: [PATCH 108/122] mmc: starfive: Add sdio/emmc driver support
   5
   6 Add sdio/emmc driver support for StarFive JH7110 soc.
   7
   8 Tested-by: Conor Dooley <conor.dooley@microchip.com>
   9 Signed-off-by: William Qiu <william.qiu@starfivetech.com>
  10 ---
  11  MAINTAINERS                        |   6 +
  12  drivers/mmc/host/Kconfig           |  10 ++
  13  drivers/mmc/host/Makefile          |   1 +
  14  drivers/mmc/host/dw_mmc-starfive.c | 186 +++++++++++++++++++++++++++++
  15  4 files changed, 203 insertions(+)
  16  create mode 100644 drivers/mmc/host/dw_mmc-starfive.c
  17
  18 --- a/MAINTAINERS
  19 +++ b/MAINTAINERS
  20 @@ -19657,6 +19657,12 @@ S:     Maintained
  21  F:     Documentation/devicetree/bindings/net/starfive,jh7110-dwmac.yaml
  22  F:     drivers/net/ethernet/stmicro/stmmac/dwmac-starfive.c
  23
  24 +STARFIVE JH7110 MMC/SD/SDIO DRIVER
  25 +M:     William Qiu <william.qiu@starfivetech.com>
  26 +S:     Supported
  27 +F:     Documentation/devicetree/bindings/mmc/starfive*
  28 +F:     drivers/mmc/host/dw_mmc-starfive.c
  29 +
  30  STARFIVE JH7110 PLL CLOCK DRIVER
  31  M:     Xingyu Wu <xingyu.wu@starfivetech.com>
  32  S:     Supported
  33 --- a/drivers/mmc/host/Kconfig
  34 +++ b/drivers/mmc/host/Kconfig
  35 @@ -872,6 +872,16 @@ config MMC_DW_ROCKCHIP
  36           Synopsys DesignWare Memory Card Interface driver. Select this option
  37           for platforms based on RK3066, RK3188 and RK3288 SoC's.
  38
  39 +config MMC_DW_STARFIVE
  40 +       tristate "StarFive specific extensions for Synopsys DW Memory Card Interface"
  41 +       depends on SOC_STARFIVE
  42 +       depends on MMC_DW
  43 +       select MMC_DW_PLTFM
  44 +       help
  45 +         This selects support for StarFive JH7110 SoC specific extensions to the
  46 +         Synopsys DesignWare Memory Card Interface driver. Select this option
  47 +         for platforms based on StarFive JH7110 SoC.
  48 +
  49  config MMC_SH_MMCIF
  50         tristate "SuperH Internal MMCIF support"
  51         depends on SUPERH || ARCH_RENESAS || COMPILE_TEST
  52 --- a/drivers/mmc/host/Makefile
  53 +++ b/drivers/mmc/host/Makefile
  54 @@ -56,6 +56,7 @@ obj-$(CONFIG_MMC_DW_HI3798CV200) += dw_m
  55  obj-$(CONFIG_MMC_DW_K3)                += dw_mmc-k3.o
  56  obj-$(CONFIG_MMC_DW_PCI)       += dw_mmc-pci.o
  57  obj-$(CONFIG_MMC_DW_ROCKCHIP)  += dw_mmc-rockchip.o
  58 +obj-$(CONFIG_MMC_DW_STARFIVE)  += dw_mmc-starfive.o
  59  obj-$(CONFIG_MMC_SH_MMCIF)     += sh_mmcif.o
  60  obj-$(CONFIG_MMC_JZ4740)       += jz4740_mmc.o
  61  obj-$(CONFIG_MMC_VUB300)       += vub300.o
  62 --- /dev/null
  63 +++ b/drivers/mmc/host/dw_mmc-starfive.c
  64 @@ -0,0 +1,186 @@
  65 +// SPDX-License-Identifier: GPL-2.0
  66 +/*
  67 + * StarFive Designware Mobile Storage Host Controller Driver
  68 + *
  69 + * Copyright (c) 2022 StarFive Technology Co., Ltd.
  70 + */
  71 +
  72 +#include <linux/clk.h>
  73 +#include <linux/delay.h>
  74 +#include <linux/mfd/syscon.h>
  75 +#include <linux/mmc/host.h>
  76 +#include <linux/module.h>
  77 +#include <linux/of_address.h>
  78 +#include <linux/platform_device.h>
  79 +#include <linux/regmap.h>
  80 +
  81 +#include "dw_mmc.h"
  82 +#include "dw_mmc-pltfm.h"
  83 +
  84 +#define ALL_INT_CLR            0x1ffff
  85 +#define MAX_DELAY_CHAIN                32
  86 +
  87 +struct starfive_priv {
  88 +       struct device *dev;
  89 +       struct regmap *reg_syscon;
  90 +       u32 syscon_offset;
  91 +       u32 syscon_shift;
  92 +       u32 syscon_mask;
  93 +};
  94 +
  95 +static void dw_mci_starfive_set_ios(struct dw_mci *host, struct mmc_ios *ios)
  96 +{
  97 +       int ret;
  98 +       unsigned int clock;
  99 +
 100 +       if (ios->timing == MMC_TIMING_MMC_DDR52 || ios->timing == MMC_TIMING_UHS_DDR50) {
 101 +               clock = (ios->clock > 50000000 && ios->clock <= 52000000) ? 100000000 : ios->clock;
 102 +               ret = clk_set_rate(host->ciu_clk, clock);
 103 +               if (ret)
 104 +                       dev_dbg(host->dev, "Use an external frequency divider %uHz\n", ios->clock);
 105 +               host->bus_hz = clk_get_rate(host->ciu_clk);
 106 +       } else {
 107 +               dev_dbg(host->dev, "Using the internal divider\n");
 108 +       }
 109 +}
 110 +
 111 +static int dw_mci_starfive_execute_tuning(struct dw_mci_slot *slot,
 112 +                                            u32 opcode)
 113 +{
 114 +       static const int grade  = MAX_DELAY_CHAIN;
 115 +       struct dw_mci *host = slot->host;
 116 +       struct starfive_priv *priv = host->priv;
 117 +       int rise_point = -1, fall_point = -1;
 118 +       int err, prev_err;
 119 +       int i;
 120 +       bool found = 0;
 121 +       u32 regval;
 122 +
 123 +       /*
 124 +        * Use grade as the max delay chain, and use the rise_point and
 125 +        * fall_point to ensure the best sampling point of a data input
 126 +        * signals.
 127 +        */
 128 +       for (i = 0; i < grade; i++) {
 129 +               regval = i << priv->syscon_shift;
 130 +               err = regmap_update_bits(priv->reg_syscon, priv->syscon_offset,
 131 +                                               priv->syscon_mask, regval);
 132 +               if (err)
 133 +                       return err;
 134 +               mci_writel(host, RINTSTS, ALL_INT_CLR);
 135 +
 136 +               err = mmc_send_tuning(slot->mmc, opcode, NULL);
 137 +               if (!err)
 138 +                       found = 1;
 139 +
 140 +               if (i > 0) {
 141 +                       if (err && !prev_err)
 142 +                               fall_point = i - 1;
 143 +                       if (!err && prev_err)
 144 +                               rise_point = i;
 145 +               }
 146 +
 147 +               if (rise_point != -1 && fall_point != -1)
 148 +                       goto tuning_out;
 149 +
 150 +               prev_err = err;
 151 +               err = 0;
 152 +       }
 153 +
 154 +tuning_out:
 155 +       if (found) {
 156 +               if (rise_point == -1)
 157 +                       rise_point = 0;
 158 +               if (fall_point == -1)
 159 +                       fall_point = grade - 1;
 160 +               if (fall_point < rise_point) {
 161 +                       if ((rise_point + fall_point) >
 162 +                           (grade - 1))
 163 +                               i = fall_point / 2;
 164 +                       else
 165 +                               i = (rise_point + grade - 1) / 2;
 166 +               } else {
 167 +                       i = (rise_point + fall_point) / 2;
 168 +               }
 169 +
 170 +               regval = i << priv->syscon_shift;
 171 +               err = regmap_update_bits(priv->reg_syscon, priv->syscon_offset,
 172 +                                               priv->syscon_mask, regval);
 173 +               if (err)
 174 +                       return err;
 175 +               mci_writel(host, RINTSTS, ALL_INT_CLR);
 176 +
 177 +               dev_info(host->dev, "Found valid delay chain! use it [delay=%d]\n", i);
 178 +       } else {
 179 +               dev_err(host->dev, "No valid delay chain! use default\n");
 180 +               err = -EINVAL;
 181 +       }
 182 +
 183 +       mci_writel(host, RINTSTS, ALL_INT_CLR);
 184 +       return err;
 185 +}
 186 +
 187 +static int dw_mci_starfive_parse_dt(struct dw_mci *host)
 188 +{
 189 +       struct of_phandle_args args;
 190 +       struct starfive_priv *priv;
 191 +       int ret;
 192 +
 193 +       priv = devm_kzalloc(host->dev, sizeof(*priv), GFP_KERNEL);
 194 +       if (!priv)
 195 +               return -ENOMEM;
 196 +
 197 +       ret = of_parse_phandle_with_fixed_args(host->dev->of_node,
 198 +                                               "starfive,sysreg", 3, 0, &args);
 199 +       if (ret) {
 200 +               dev_err(host->dev, "Failed to parse starfive,sysreg\n");
 201 +               return -EINVAL;
 202 +       }
 203 +
 204 +       priv->reg_syscon = syscon_node_to_regmap(args.np);
 205 +       of_node_put(args.np);
 206 +       if (IS_ERR(priv->reg_syscon))
 207 +               return PTR_ERR(priv->reg_syscon);
 208 +
 209 +       priv->syscon_offset = args.args[0];
 210 +       priv->syscon_shift  = args.args[1];
 211 +       priv->syscon_mask   = args.args[2];
 212 +
 213 +       host->priv = priv;
 214 +
 215 +       return 0;
 216 +}
 217 +
 218 +static const struct dw_mci_drv_data starfive_data = {
 219 +       .common_caps            = MMC_CAP_CMD23,
 220 +       .set_ios                = dw_mci_starfive_set_ios,
 221 +       .parse_dt               = dw_mci_starfive_parse_dt,
 222 +       .execute_tuning         = dw_mci_starfive_execute_tuning,
 223 +};
 224 +
 225 +static const struct of_device_id dw_mci_starfive_match[] = {
 226 +       { .compatible = "starfive,jh7110-mmc",
 227 +               .data = &starfive_data },
 228 +       {},
 229 +};
 230 +MODULE_DEVICE_TABLE(of, dw_mci_starfive_match);
 231 +
 232 +static int dw_mci_starfive_probe(struct platform_device *pdev)
 233 +{
 234 +       return dw_mci_pltfm_register(pdev, &starfive_data);
 235 +}
 236 +
 237 +static struct platform_driver dw_mci_starfive_driver = {
 238 +       .probe = dw_mci_starfive_probe,
 239 +       .remove = dw_mci_pltfm_remove,
 240 +       .driver = {
 241 +               .name = "dwmmc_starfive",
 242 +               .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 243 +               .of_match_table = dw_mci_starfive_match,
 244 +       },
 245 +};
 246 +module_platform_driver(dw_mci_starfive_driver);
 247 +
 248 +MODULE_DESCRIPTION("StarFive JH7110 Specific DW-MSHC Driver Extension");
 249 +MODULE_LICENSE("GPL");
 250 +MODULE_ALIAS("platform:dwmmc_starfive");