drivers/ata/ahci_qoriq.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Freescale QorIQ AHCI SATA platform driver
   4  *
   5  * Copyright 2015 Freescale, Inc.
   6  *   Tang Yuantian <Yuantian.Tang@freescale.com>
   7  */
   8
   9 #include <linux/kernel.h>
  10 #include <linux/module.h>
  11 #include <linux/pm.h>
  12 #include <linux/ahci_platform.h>
  13 #include <linux/device.h>
  14 #include <linux/of_address.h>
  15 #include <linux/of.h>
  16 #include <linux/of_device.h>
  17 #include <linux/platform_device.h>
  18 #include <linux/libata.h>
  19 #include "ahci.h"
  20
  21 #define DRV_NAME "ahci-qoriq"
  22
  23 /* port register definition */
  24 #define PORT_PHY1       0xA8
  25 #define PORT_PHY2       0xAC
  26 #define PORT_PHY3       0xB0
  27 #define PORT_PHY4       0xB4
  28 #define PORT_PHY5       0xB8
  29 #define PORT_AXICC      0xBC
  30 #define PORT_TRANS      0xC8
  31
  32 /* port register default value */
  33 #define AHCI_PORT_PHY_1_CFG     0xa003fffe
  34 #define AHCI_PORT_PHY2_CFG      0x28184d1f
  35 #define AHCI_PORT_PHY3_CFG      0x0e081509
  36 #define AHCI_PORT_TRANS_CFG     0x08000029
  37 #define AHCI_PORT_AXICC_CFG     0x3fffffff
  38
  39 /* for ls1021a */
  40 #define LS1021A_PORT_PHY2       0x28183414
  41 #define LS1021A_PORT_PHY3       0x0e080e06
  42 #define LS1021A_PORT_PHY4       0x064a080b
  43 #define LS1021A_PORT_PHY5       0x2aa86470
  44 #define LS1021A_AXICC_ADDR      0xC0
  45
  46 #define SATA_ECC_DISABLE        0x00020000
  47 #define ECC_DIS_ARMV8_CH2       0x80000000
  48 #define ECC_DIS_LS1088A         0x40000000
  49
  50 enum ahci_qoriq_type {
  51         AHCI_LS1021A,
  52         AHCI_LS1028A,
  53         AHCI_LS1043A,
  54         AHCI_LS2080A,
  55         AHCI_LS1046A,
  56         AHCI_LS1088A,
  57         AHCI_LS2088A,
  58         AHCI_LX2160A,
  59 };
  60
  61 struct ahci_qoriq_priv {
  62         struct ccsr_ahci *reg_base;
  63         enum ahci_qoriq_type type;
  64         void __iomem *ecc_addr;
  65         bool is_dmacoherent;
  66 };
  67
  68 static bool ecc_initialized;
  69
  70 static const struct of_device_id ahci_qoriq_of_match[] = {
  71         { .compatible = "fsl,ls1021a-ahci", .data = (void *)AHCI_LS1021A},
  72         { .compatible = "fsl,ls1028a-ahci", .data = (void *)AHCI_LS1028A},
  73         { .compatible = "fsl,ls1043a-ahci", .data = (void *)AHCI_LS1043A},
  74         { .compatible = "fsl,ls2080a-ahci", .data = (void *)AHCI_LS2080A},
  75         { .compatible = "fsl,ls1046a-ahci", .data = (void *)AHCI_LS1046A},
  76         { .compatible = "fsl,ls1088a-ahci", .data = (void *)AHCI_LS1088A},
  77         { .compatible = "fsl,ls2088a-ahci", .data = (void *)AHCI_LS2088A},
  78         { .compatible = "fsl,lx2160a-ahci", .data = (void *)AHCI_LX2160A},
  79         {},
  80 };
  81 MODULE_DEVICE_TABLE(of, ahci_qoriq_of_match);
  82
  83 static int ahci_qoriq_hardreset(struct ata_link *link, unsigned int *class,
  84                           unsigned long deadline)
  85 {
  86         const unsigned long *timing = sata_ehc_deb_timing(&link->eh_context);
  87         void __iomem *port_mmio = ahci_port_base(link->ap);
  88         u32 px_cmd, px_is, px_val;
  89         struct ata_port *ap = link->ap;
  90         struct ahci_port_priv *pp = ap->private_data;
  91         struct ahci_host_priv *hpriv = ap->host->private_data;
  92         struct ahci_qoriq_priv *qoriq_priv = hpriv->plat_data;
  93         u8 *d2h_fis = pp->rx_fis + RX_FIS_D2H_REG;
  94         struct ata_taskfile tf;
  95         bool online;
  96         int rc;
  97         bool ls1021a_workaround = (qoriq_priv->type == AHCI_LS1021A);
  98
  99         DPRINTK("ENTER\n");
 100
 101         hpriv->stop_engine(ap);
 102
 103         /*
 104          * There is a errata on ls1021a Rev1.0 and Rev2.0 which is:
 105          * A-009042: The device detection initialization sequence
 106          * mistakenly resets some registers.
 107          *
 108          * Workaround for this is:
 109          * The software should read and store PxCMD and PxIS values
 110          * before issuing the device detection initialization sequence.
 111          * After the sequence is complete, software should restore the
 112          * PxCMD and PxIS with the stored values.
 113          */
 114         if (ls1021a_workaround) {
 115                 px_cmd = readl(port_mmio + PORT_CMD);
 116                 px_is = readl(port_mmio + PORT_IRQ_STAT);
 117         }
 118
 119         /* clear D2H reception area to properly wait for D2H FIS */
 120         ata_tf_init(link->device, &tf);
 121         tf.command = ATA_BUSY;
 122         ata_tf_to_fis(&tf, 0, 0, d2h_fis);
 123
 124         rc = sata_link_hardreset(link, timing, deadline, &online,
 125                                  ahci_check_ready);
 126
 127         /* restore the PxCMD and PxIS on ls1021 */
 128         if (ls1021a_workaround) {
 129                 px_val = readl(port_mmio + PORT_CMD);
 130                 if (px_val != px_cmd)
 131                         writel(px_cmd, port_mmio + PORT_CMD);
 132
 133                 px_val = readl(port_mmio + PORT_IRQ_STAT);
 134                 if (px_val != px_is)
 135                         writel(px_is, port_mmio + PORT_IRQ_STAT);
 136         }
 137
 138         hpriv->start_engine(ap);
 139
 140         if (online)
 141                 *class = ahci_dev_classify(ap);
 142
 143         DPRINTK("EXIT, rc=%d, class=%u\n", rc, *class);
 144         return rc;
 145 }
 146
 147 static struct ata_port_operations ahci_qoriq_ops = {
 148         .inherits       = &ahci_ops,
 149         .hardreset      = ahci_qoriq_hardreset,
 150 };
 151
 152 static const struct ata_port_info ahci_qoriq_port_info = {
 153         .flags          = AHCI_FLAG_COMMON | ATA_FLAG_NCQ,
 154         .pio_mask       = ATA_PIO4,
 155         .udma_mask      = ATA_UDMA6,
 156         .port_ops       = &ahci_qoriq_ops,
 157 };
 158
 159 static struct scsi_host_template ahci_qoriq_sht = {
 160         AHCI_SHT(DRV_NAME),
 161 };
 162
 163 static int ahci_qoriq_phy_init(struct ahci_host_priv *hpriv)
 164 {
 165         struct ahci_qoriq_priv *qpriv = hpriv->plat_data;
 166         void __iomem *reg_base = hpriv->mmio;
 167
 168         switch (qpriv->type) {
 169         case AHCI_LS1021A:
 170                 if (!(qpriv->ecc_addr || ecc_initialized))
 171                         return -EINVAL;
 172                 else if (qpriv->ecc_addr && !ecc_initialized)
 173                         writel(SATA_ECC_DISABLE, qpriv->ecc_addr);
 174                 writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
 175                 writel(LS1021A_PORT_PHY2, reg_base + PORT_PHY2);
 176                 writel(LS1021A_PORT_PHY3, reg_base + PORT_PHY3);
 177                 writel(LS1021A_PORT_PHY4, reg_base + PORT_PHY4);
 178                 writel(LS1021A_PORT_PHY5, reg_base + PORT_PHY5);
 179                 writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
 180                 if (qpriv->is_dmacoherent)
 181                         writel(AHCI_PORT_AXICC_CFG,
 182                                         reg_base + LS1021A_AXICC_ADDR);
 183                 break;
 184
 185         case AHCI_LS1043A:
 186                 if (!(qpriv->ecc_addr || ecc_initialized))
 187                         return -EINVAL;
 188                 else if (qpriv->ecc_addr && !ecc_initialized)
 189                         writel(readl(qpriv->ecc_addr) |
 190                                ECC_DIS_ARMV8_CH2,
 191                                qpriv->ecc_addr);
 192                 writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
 193                 writel(AHCI_PORT_PHY2_CFG, reg_base + PORT_PHY2);
 194                 writel(AHCI_PORT_PHY3_CFG, reg_base + PORT_PHY3);
 195                 writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
 196                 if (qpriv->is_dmacoherent)
 197                         writel(AHCI_PORT_AXICC_CFG, reg_base + PORT_AXICC);
 198                 break;
 199
 200         case AHCI_LS2080A:
 201                 writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
 202                 writel(AHCI_PORT_PHY2_CFG, reg_base + PORT_PHY2);
 203                 writel(AHCI_PORT_PHY3_CFG, reg_base + PORT_PHY3);
 204                 writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
 205                 if (qpriv->is_dmacoherent)
 206                         writel(AHCI_PORT_AXICC_CFG, reg_base + PORT_AXICC);
 207                 break;
 208
 209         case AHCI_LS1046A:
 210                 if (!(qpriv->ecc_addr || ecc_initialized))
 211                         return -EINVAL;
 212                 else if (qpriv->ecc_addr && !ecc_initialized)
 213                         writel(readl(qpriv->ecc_addr) |
 214                                ECC_DIS_ARMV8_CH2,
 215                                qpriv->ecc_addr);
 216                 writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
 217                 writel(AHCI_PORT_PHY2_CFG, reg_base + PORT_PHY2);
 218                 writel(AHCI_PORT_PHY3_CFG, reg_base + PORT_PHY3);
 219                 writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
 220                 if (qpriv->is_dmacoherent)
 221                         writel(AHCI_PORT_AXICC_CFG, reg_base + PORT_AXICC);
 222                 break;
 223
 224         case AHCI_LS1028A:
 225         case AHCI_LS1088A:
 226         case AHCI_LX2160A:
 227                 if (!(qpriv->ecc_addr || ecc_initialized))
 228                         return -EINVAL;
 229                 else if (qpriv->ecc_addr && !ecc_initialized)
 230                         writel(readl(qpriv->ecc_addr) |
 231                                ECC_DIS_LS1088A,
 232                                qpriv->ecc_addr);
 233                 writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
 234                 writel(AHCI_PORT_PHY2_CFG, reg_base + PORT_PHY2);
 235                 writel(AHCI_PORT_PHY3_CFG, reg_base + PORT_PHY3);
 236                 writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
 237                 if (qpriv->is_dmacoherent)
 238                         writel(AHCI_PORT_AXICC_CFG, reg_base + PORT_AXICC);
 239                 break;
 240
 241         case AHCI_LS2088A:
 242                 writel(AHCI_PORT_PHY_1_CFG, reg_base + PORT_PHY1);
 243                 writel(AHCI_PORT_PHY2_CFG, reg_base + PORT_PHY2);
 244                 writel(AHCI_PORT_PHY3_CFG, reg_base + PORT_PHY3);
 245                 writel(AHCI_PORT_TRANS_CFG, reg_base + PORT_TRANS);
 246                 if (qpriv->is_dmacoherent)
 247                         writel(AHCI_PORT_AXICC_CFG, reg_base + PORT_AXICC);
 248                 break;
 249         }
 250
 251         ecc_initialized = true;
 252         return 0;
 253 }
 254
 255 static int ahci_qoriq_probe(struct platform_device *pdev)
 256 {
 257         struct device_node *np = pdev->dev.of_node;
 258         struct device *dev = &pdev->dev;
 259         struct ahci_host_priv *hpriv;
 260         struct ahci_qoriq_priv *qoriq_priv;
 261         const struct of_device_id *of_id;
 262         struct resource *res;
 263         int rc;
 264
 265         hpriv = ahci_platform_get_resources(pdev, 0);
 266         if (IS_ERR(hpriv))
 267                 return PTR_ERR(hpriv);
 268
 269         of_id = of_match_node(ahci_qoriq_of_match, np);
 270         if (!of_id)
 271                 return -ENODEV;
 272
 273         qoriq_priv = devm_kzalloc(dev, sizeof(*qoriq_priv), GFP_KERNEL);
 274         if (!qoriq_priv)
 275                 return -ENOMEM;
 276
 277         qoriq_priv->type = (enum ahci_qoriq_type)of_id->data;
 278
 279         if (unlikely(!ecc_initialized)) {
 280                 res = platform_get_resource_byname(pdev,
 281                                                    IORESOURCE_MEM,
 282                                                    "sata-ecc");
 283                 if (res) {
 284                         qoriq_priv->ecc_addr =
 285                                 devm_ioremap_resource(dev, res);
 286                         if (IS_ERR(qoriq_priv->ecc_addr))
 287                                 return PTR_ERR(qoriq_priv->ecc_addr);
 288                 }
 289         }
 290
 291         qoriq_priv->is_dmacoherent = of_dma_is_coherent(np);
 292
 293         rc = ahci_platform_enable_resources(hpriv);
 294         if (rc)
 295                 return rc;
 296
 297         hpriv->plat_data = qoriq_priv;
 298         rc = ahci_qoriq_phy_init(hpriv);
 299         if (rc)
 300                 goto disable_resources;
 301
 302         rc = ahci_platform_init_host(pdev, hpriv, &ahci_qoriq_port_info,
 303                                      &ahci_qoriq_sht);
 304         if (rc)
 305                 goto disable_resources;
 306
 307         return 0;
 308
 309 disable_resources:
 310         ahci_platform_disable_resources(hpriv);
 311
 312         return rc;
 313 }
 314
 315 #ifdef CONFIG_PM_SLEEP
 316 static int ahci_qoriq_resume(struct device *dev)
 317 {
 318         struct ata_host *host = dev_get_drvdata(dev);
 319         struct ahci_host_priv *hpriv = host->private_data;
 320         int rc;
 321
 322         rc = ahci_platform_enable_resources(hpriv);
 323         if (rc)
 324                 return rc;
 325
 326         rc = ahci_qoriq_phy_init(hpriv);
 327         if (rc)
 328                 goto disable_resources;
 329
 330         rc = ahci_platform_resume_host(dev);
 331         if (rc)
 332                 goto disable_resources;
 333
 334         /* We resumed so update PM runtime state */
 335         pm_runtime_disable(dev);
 336         pm_runtime_set_active(dev);
 337         pm_runtime_enable(dev);
 338
 339         return 0;
 340
 341 disable_resources:
 342         ahci_platform_disable_resources(hpriv);
 343
 344         return rc;
 345 }
 346 #endif
 347
 348 static SIMPLE_DEV_PM_OPS(ahci_qoriq_pm_ops, ahci_platform_suspend,
 349                          ahci_qoriq_resume);
 350
 351 static struct platform_driver ahci_qoriq_driver = {
 352         .probe = ahci_qoriq_probe,
 353         .remove = ata_platform_remove_one,
 354         .driver = {
 355                 .name = DRV_NAME,
 356                 .of_match_table = ahci_qoriq_of_match,
 357                 .pm = &ahci_qoriq_pm_ops,
 358         },
 359 };
 360 module_platform_driver(ahci_qoriq_driver);
 361
 362 MODULE_DESCRIPTION("Freescale QorIQ AHCI SATA platform driver");
 363 MODULE_AUTHOR("Tang Yuantian <Yuantian.Tang@freescale.com>");
 364 MODULE_LICENSE("GPL");