drivers/ata/mtk_ahci.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * MTK SATA platform driver
   4  *
   5  * Copyright (C) 2020 MediaTek Inc.
   6  *
   7  * Author: Ryder Lee <[email protected]>
   8  * Author: Frank Wunderlich <[email protected]>
   9  */
  10
  11 #include <ahci.h>
  12 #include <asm/global_data.h>
  13 #include <asm/io.h>
  14 #include <dm.h>
  15 #include <dm/of_access.h>
  16 #include <generic-phy.h>
  17 #include <linux/err.h>
  18 #include <regmap.h>
  19 #include <reset.h>
  20 #include <sata.h>
  21 #include <scsi.h>
  22 #include <syscon.h>
  23 #include <dm/device_compat.h>
  24
  25 #define SYS_CFG                 0x14
  26 #define SYS_CFG_SATA_MSK        GENMASK(31, 30)
  27 #define SYS_CFG_SATA_EN         BIT(31)
  28
  29 struct mtk_ahci_priv {
  30         void *base;
  31
  32         struct ahci_uc_priv ahci_priv;
  33         struct regmap *mode;
  34         struct reset_ctl_bulk rst_bulk;
  35 };
  36
  37 static int mtk_ahci_bind(struct udevice *dev)
  38 {
  39         struct udevice *scsi_dev;
  40
  41         return ahci_bind_scsi(dev, &scsi_dev);
  42 }
  43
  44 static int mtk_ahci_of_to_plat(struct udevice *dev)
  45 {
  46         struct mtk_ahci_priv *priv = dev_get_priv(dev);
  47
  48         priv->base = devfdt_remap_addr_index(dev, 0);
  49
  50         return 0;
  51 }
  52
  53 static int mtk_ahci_parse_property(struct ahci_uc_priv *hpriv,
  54                                    struct udevice *dev)
  55 {
  56         struct mtk_ahci_priv *plat = dev_get_priv(dev);
  57         const void *fdt = gd->fdt_blob;
  58
  59         /* enable SATA function if needed */
  60         if (fdt_get_property(fdt, dev_of_offset(dev),
  61                              "mediatek,phy-mode", NULL)) {
  62                 plat->mode = syscon_regmap_lookup_by_phandle(dev,
  63                                                 "mediatek,phy-mode");
  64                 if (IS_ERR(plat->mode)) {
  65                         dev_err(dev, "missing phy-mode phandle\n");
  66                         return PTR_ERR(plat->mode);
  67                 }
  68                 regmap_update_bits(plat->mode, SYS_CFG,
  69                                    SYS_CFG_SATA_MSK, SYS_CFG_SATA_EN);
  70         }
  71
  72         ofnode_read_u32(dev_ofnode(dev), "ports-implemented",
  73                         &hpriv->port_map);
  74         return 0;
  75 }
  76
  77 static int mtk_ahci_probe(struct udevice *dev)
  78 {
  79         struct mtk_ahci_priv *priv = dev_get_priv(dev);
  80         int ret;
  81         struct phy phy;
  82
  83         ret = mtk_ahci_parse_property(&priv->ahci_priv, dev);
  84         if (ret)
  85                 return ret;
  86
  87         ret = reset_get_bulk(dev, &priv->rst_bulk);
  88         if (!ret) {
  89                 reset_assert_bulk(&priv->rst_bulk);
  90                 reset_deassert_bulk(&priv->rst_bulk);
  91         } else {
  92                 dev_err(dev, "Failed to get reset: %d\n", ret);
  93         }
  94
  95         ret = generic_phy_get_by_name(dev, "sata-phy", &phy);
  96         if (ret) {
  97                 pr_err("can't get the phy from DT\n");
  98                 return ret;
  99         }
 100
 101         ret = generic_phy_init(&phy);
 102         if (ret) {
 103                 pr_err("unable to initialize the sata phy\n");
 104                 return ret;
 105         }
 106
 107         ret = generic_phy_power_on(&phy);
 108         if (ret) {
 109                 pr_err("unable to power on the sata phy\n");
 110                 return ret;
 111         }
 112
 113         return ahci_probe_scsi(dev, (ulong)priv->base);
 114 }
 115
 116 static const struct udevice_id mtk_ahci_ids[] = {
 117         { .compatible = "mediatek,mtk-ahci" },
 118         { }
 119 };
 120
 121 U_BOOT_DRIVER(mtk_ahci) = {
 122         .name   = "mtk_ahci",
 123         .id     = UCLASS_AHCI,
 124         .of_match = mtk_ahci_ids,
 125         .bind   = mtk_ahci_bind,
 126         .of_to_plat = mtk_ahci_of_to_plat,
 127         .ops    = &scsi_ops,
 128         .probe  = mtk_ahci_probe,
 129         .priv_auto      = sizeof(struct mtk_ahci_priv),
 130 };