drivers/mmc/zynq_sdhci.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * (C) Copyright 2013 - 2015 Xilinx, Inc.
   4  *
   5  * Xilinx Zynq SD Host Controller Interface
   6  */
   7
   8 #include <clk.h>
   9 #include <common.h>
  10 #include <dm.h>
  11 #include <fdtdec.h>
  12 #include "mmc_private.h"
  13 #include <linux/libfdt.h>
  14 #include <malloc.h>
  15 #include <sdhci.h>
  16 #include <zynqmp_tap_delay.h>
  17
  18 DECLARE_GLOBAL_DATA_PTR;
  19
  20 struct arasan_sdhci_plat {
  21         struct mmc_config cfg;
  22         struct mmc mmc;
  23         unsigned int f_max;
  24 };
  25
  26 struct arasan_sdhci_priv {
  27         struct sdhci_host *host;
  28         u8 deviceid;
  29         u8 bank;
  30         u8 no_1p8;
  31         bool pwrseq;
  32 };
  33
  34 #if defined(CONFIG_ARCH_ZYNQMP)
  35 #define MMC_HS200_BUS_SPEED     5
  36
  37 static const u8 mode2timing[] = {
  38         [MMC_LEGACY] = UHS_SDR12_BUS_SPEED,
  39         [SD_LEGACY] = UHS_SDR12_BUS_SPEED,
  40         [MMC_HS] = HIGH_SPEED_BUS_SPEED,
  41         [SD_HS] = HIGH_SPEED_BUS_SPEED,
  42         [MMC_HS_52] = HIGH_SPEED_BUS_SPEED,
  43         [MMC_DDR_52] = HIGH_SPEED_BUS_SPEED,
  44         [UHS_SDR12] = UHS_SDR12_BUS_SPEED,
  45         [UHS_SDR25] = UHS_SDR25_BUS_SPEED,
  46         [UHS_SDR50] = UHS_SDR50_BUS_SPEED,
  47         [UHS_DDR50] = UHS_DDR50_BUS_SPEED,
  48         [UHS_SDR104] = UHS_SDR104_BUS_SPEED,
  49         [MMC_HS_200] = MMC_HS200_BUS_SPEED,
  50 };
  51
  52 #define SDHCI_HOST_CTRL2        0x3E
  53 #define SDHCI_CTRL2_MODE_MASK   0x7
  54 #define SDHCI_18V_SIGNAL        0x8
  55 #define SDHCI_CTRL_EXEC_TUNING  0x0040
  56 #define SDHCI_CTRL_TUNED_CLK    0x80
  57 #define SDHCI_TUNING_LOOP_COUNT 40
  58
  59 static void arasan_zynqmp_dll_reset(struct sdhci_host *host, u8 deviceid)
  60 {
  61         u16 clk;
  62         unsigned long timeout;
  63
  64         clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
  65         clk &= ~(SDHCI_CLOCK_CARD_EN);
  66         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
  67
  68         /* Issue DLL Reset */
  69         zynqmp_dll_reset(deviceid);
  70
  71         /* Wait max 20 ms */
  72         timeout = 100;
  73         while (!((clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL))
  74                                 & SDHCI_CLOCK_INT_STABLE)) {
  75                 if (timeout == 0) {
  76                         dev_err(mmc_dev(host->mmc),
  77                                 ": Internal clock never stabilised.\n");
  78                         return;
  79                 }
  80                 timeout--;
  81                 udelay(1000);
  82         }
  83
  84         clk |= SDHCI_CLOCK_CARD_EN;
  85         sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
  86 }
  87
  88 static int arasan_sdhci_execute_tuning(struct mmc *mmc, u8 opcode)
  89 {
  90         struct mmc_cmd cmd;
  91         struct mmc_data data;
  92         u32 ctrl;
  93         struct sdhci_host *host;
  94         struct arasan_sdhci_priv *priv = dev_get_priv(mmc->dev);
  95         char tuning_loop_counter = SDHCI_TUNING_LOOP_COUNT;
  96         u8 deviceid;
  97
  98         debug("%s\n", __func__);
  99
 100         host = priv->host;
 101         deviceid = priv->deviceid;
 102
 103         ctrl = sdhci_readw(host, SDHCI_HOST_CTRL2);
 104         ctrl |= SDHCI_CTRL_EXEC_TUNING;
 105         sdhci_writew(host, ctrl, SDHCI_HOST_CTRL2);
 106
 107         mdelay(1);
 108
 109         arasan_zynqmp_dll_reset(host, deviceid);
 110
 111         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_INT_ENABLE);
 112         sdhci_writel(host, SDHCI_INT_DATA_AVAIL, SDHCI_SIGNAL_ENABLE);
 113
 114         do {
 115                 cmd.cmdidx = opcode;
 116                 cmd.resp_type = MMC_RSP_R1;
 117                 cmd.cmdarg = 0;
 118
 119                 data.blocksize = 64;
 120                 data.blocks = 1;
 121                 data.flags = MMC_DATA_READ;
 122
 123                 if (tuning_loop_counter-- == 0)
 124                         break;
 125
 126                 if (cmd.cmdidx == MMC_CMD_SEND_TUNING_BLOCK_HS200 &&
 127                     mmc->bus_width == 8)
 128                         data.blocksize = 128;
 129
 130                 sdhci_writew(host, SDHCI_MAKE_BLKSZ(SDHCI_DEFAULT_BOUNDARY_ARG,
 131                                                     data.blocksize),
 132                              SDHCI_BLOCK_SIZE);
 133                 sdhci_writew(host, data.blocks, SDHCI_BLOCK_COUNT);
 134                 sdhci_writew(host, SDHCI_TRNS_READ, SDHCI_TRANSFER_MODE);
 135
 136                 mmc_send_cmd(mmc, &cmd, NULL);
 137                 ctrl = sdhci_readw(host, SDHCI_HOST_CTRL2);
 138
 139                 if (cmd.cmdidx == MMC_CMD_SEND_TUNING_BLOCK)
 140                         udelay(1);
 141
 142         } while (ctrl & SDHCI_CTRL_EXEC_TUNING);
 143
 144         if (tuning_loop_counter < 0) {
 145                 ctrl &= ~SDHCI_CTRL_TUNED_CLK;
 146                 sdhci_writel(host, ctrl, SDHCI_HOST_CTRL2);
 147         }
 148
 149         if (!(ctrl & SDHCI_CTRL_TUNED_CLK)) {
 150                 printf("%s:Tuning failed\n", __func__);
 151                 return -1;
 152         }
 153
 154         udelay(1);
 155         arasan_zynqmp_dll_reset(host, deviceid);
 156
 157         /* Enable only interrupts served by the SD controller */
 158         sdhci_writel(host, SDHCI_INT_DATA_MASK | SDHCI_INT_CMD_MASK,
 159                      SDHCI_INT_ENABLE);
 160         /* Mask all sdhci interrupt sources */
 161         sdhci_writel(host, 0x0, SDHCI_SIGNAL_ENABLE);
 162
 163         return 0;
 164 }
 165
 166 static void arasan_sdhci_set_tapdelay(struct sdhci_host *host)
 167 {
 168         struct arasan_sdhci_priv *priv = dev_get_priv(host->mmc->dev);
 169         struct mmc *mmc = (struct mmc *)host->mmc;
 170         u8 uhsmode;
 171
 172         uhsmode = mode2timing[mmc->selected_mode];
 173
 174         if (uhsmode >= UHS_SDR25_BUS_SPEED)
 175                 arasan_zynqmp_set_tapdelay(priv->deviceid, uhsmode,
 176                                            priv->bank);
 177 }
 178
 179 static void arasan_sdhci_set_control_reg(struct sdhci_host *host)
 180 {
 181         struct mmc *mmc = (struct mmc *)host->mmc;
 182         u32 reg;
 183
 184         if (!IS_SD(mmc))
 185                 return;
 186
 187         if (mmc->signal_voltage == MMC_SIGNAL_VOLTAGE_180) {
 188                 reg = sdhci_readw(host, SDHCI_HOST_CTRL2);
 189                 reg |= SDHCI_18V_SIGNAL;
 190                 sdhci_writew(host, reg, SDHCI_HOST_CTRL2);
 191         }
 192
 193         if (mmc->selected_mode > SD_HS &&
 194             mmc->selected_mode <= UHS_DDR50) {
 195                 reg = sdhci_readw(host, SDHCI_HOST_CTRL2);
 196                 reg &= ~SDHCI_CTRL2_MODE_MASK;
 197                 switch (mmc->selected_mode) {
 198                 case UHS_SDR12:
 199                         reg |= UHS_SDR12_BUS_SPEED;
 200                         break;
 201                 case UHS_SDR25:
 202                         reg |= UHS_SDR25_BUS_SPEED;
 203                         break;
 204                 case UHS_SDR50:
 205                         reg |= UHS_SDR50_BUS_SPEED;
 206                         break;
 207                 case UHS_SDR104:
 208                         reg |= UHS_SDR104_BUS_SPEED;
 209                         break;
 210                 case UHS_DDR50:
 211                         reg |= UHS_DDR50_BUS_SPEED;
 212                         break;
 213                 default:
 214                         break;
 215                 }
 216                 sdhci_writew(host, reg, SDHCI_HOST_CTRL2);
 217         }
 218 }
 219 #endif
 220
 221 #if defined(CONFIG_DM_MMC) && defined(CONFIG_ARCH_ZYNQMP)
 222 const struct sdhci_ops arasan_ops = {
 223         .platform_execute_tuning        = &arasan_sdhci_execute_tuning,
 224         .set_delay = &arasan_sdhci_set_tapdelay,
 225         .set_control_reg = &arasan_sdhci_set_control_reg,
 226 };
 227 #endif
 228
 229 static int arasan_sdhci_probe(struct udevice *dev)
 230 {
 231         struct arasan_sdhci_plat *plat = dev_get_platdata(dev);
 232         struct mmc_uclass_priv *upriv = dev_get_uclass_priv(dev);
 233         struct arasan_sdhci_priv *priv = dev_get_priv(dev);
 234         struct sdhci_host *host;
 235         struct clk clk;
 236         unsigned long clock;
 237         int ret;
 238
 239         host = priv->host;
 240
 241         ret = clk_get_by_index(dev, 0, &clk);
 242         if (ret < 0) {
 243                 dev_err(dev, "failed to get clock\n");
 244                 return ret;
 245         }
 246
 247         clock = clk_get_rate(&clk);
 248         if (IS_ERR_VALUE(clock)) {
 249                 dev_err(dev, "failed to get rate\n");
 250                 return clock;
 251         }
 252
 253         debug("%s: CLK %ld\n", __func__, clock);
 254
 255         ret = clk_enable(&clk);
 256         if (ret && ret != -ENOSYS) {
 257                 dev_err(dev, "failed to enable clock\n");
 258                 return ret;
 259         }
 260
 261         host->quirks = SDHCI_QUIRK_WAIT_SEND_CMD |
 262                        SDHCI_QUIRK_BROKEN_R1B;
 263
 264 #ifdef CONFIG_ZYNQ_HISPD_BROKEN
 265         host->quirks |= SDHCI_QUIRK_BROKEN_HISPD_MODE;
 266 #endif
 267
 268         if (priv->no_1p8)
 269                 host->quirks |= SDHCI_QUIRK_NO_1_8_V;
 270
 271         host->max_clk = clock;
 272
 273         ret = sdhci_setup_cfg(&plat->cfg, host, plat->f_max,
 274                               CONFIG_ZYNQ_SDHCI_MIN_FREQ);
 275         host->mmc = &plat->mmc;
 276         if (ret)
 277                 return ret;
 278         host->mmc->priv = host;
 279         host->mmc->dev = dev;
 280         upriv->mmc = host->mmc;
 281
 282         return sdhci_probe(dev);
 283 }
 284
 285 static int arasan_sdhci_ofdata_to_platdata(struct udevice *dev)
 286 {
 287         struct arasan_sdhci_plat *plat = dev_get_platdata(dev);
 288         struct arasan_sdhci_priv *priv = dev_get_priv(dev);
 289
 290         priv->host = calloc(1, sizeof(struct sdhci_host));
 291         if (!priv->host)
 292                 return -1;
 293
 294         priv->host->name = dev->name;
 295
 296 #if defined(CONFIG_DM_MMC) && defined(CONFIG_ARCH_ZYNQMP)
 297         priv->host->ops = &arasan_ops;
 298 #endif
 299
 300         priv->host->ioaddr = (void *)dev_read_addr(dev);
 301         if (IS_ERR(priv->host->ioaddr))
 302                 return PTR_ERR(priv->host->ioaddr);
 303
 304         priv->deviceid = dev_read_u32_default(dev, "xlnx,device_id", -1);
 305         priv->bank = dev_read_u32_default(dev, "xlnx,mio_bank", -1);
 306         priv->no_1p8 = dev_read_bool(dev, "no-1-8-v");
 307
 308         plat->f_max = dev_read_u32_default(dev, "max-frequency",
 309                                            CONFIG_ZYNQ_SDHCI_MAX_FREQ);
 310         return 0;
 311 }
 312
 313 static int arasan_sdhci_bind(struct udevice *dev)
 314 {
 315         struct arasan_sdhci_plat *plat = dev_get_platdata(dev);
 316
 317         return sdhci_bind(dev, &plat->mmc, &plat->cfg);
 318 }
 319
 320 static const struct udevice_id arasan_sdhci_ids[] = {
 321         { .compatible = "arasan,sdhci-8.9a" },
 322         { }
 323 };
 324
 325 U_BOOT_DRIVER(arasan_sdhci_drv) = {
 326         .name           = "arasan_sdhci",
 327         .id             = UCLASS_MMC,
 328         .of_match       = arasan_sdhci_ids,
 329         .ofdata_to_platdata = arasan_sdhci_ofdata_to_platdata,
 330         .ops            = &sdhci_ops,
 331         .bind           = arasan_sdhci_bind,
 332         .probe          = arasan_sdhci_probe,
 333         .priv_auto_alloc_size = sizeof(struct arasan_sdhci_priv),
 334         .platdata_auto_alloc_size = sizeof(struct arasan_sdhci_plat),
 335 };