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 <ryder.lee@mediatek.com>
   8  * Author: Frank Wunderlich <frank-w@public-files.de>
   9  */
  10
  11 #include <common.h>
  12 #include <ahci.h>
  13 #include <asm/global_data.h>
  14 #include <asm/io.h>
  15 #include <dm.h>
  16 #include <dm/of_access.h>
  17 #include <generic-phy.h>
  18 #include <linux/err.h>
  19 #include <regmap.h>
  20 #include <reset.h>
  21 #include <sata.h>
  22 #include <scsi.h>
  23 #include <syscon.h>
  24 #include <dm/device_compat.h>
  25
  26 #define SYS_CFG                 0x14
  27 #define SYS_CFG_SATA_MSK        GENMASK(31, 30)
  28 #define SYS_CFG_SATA_EN         BIT(31)
  29
  30 struct mtk_ahci_priv {
  31         void *base;
  32
  33         struct ahci_uc_priv ahci_priv;
  34         struct regmap *mode;
  35         struct reset_ctl_bulk rst_bulk;
  36 };
  37
  38 static int mtk_ahci_bind(struct udevice *dev)
  39 {
  40         struct udevice *scsi_dev;
  41
  42         return ahci_bind_scsi(dev, &scsi_dev);
  43 }
  44
  45 static int mtk_ahci_of_to_plat(struct udevice *dev)
  46 {
  47         struct mtk_ahci_priv *priv = dev_get_priv(dev);
  48
  49         priv->base = devfdt_remap_addr_index(dev, 0);
  50
  51         return 0;
  52 }
  53
  54 static int mtk_ahci_parse_property(struct ahci_uc_priv *hpriv,
  55                                    struct udevice *dev)
  56 {
  57         struct mtk_ahci_priv *plat = dev_get_priv(dev);
  58         const void *fdt = gd->fdt_blob;
  59
  60         /* enable SATA function if needed */
  61         if (fdt_get_property(fdt, dev_of_offset(dev),
  62                              "mediatek,phy-mode", NULL)) {
  63                 plat->mode = syscon_regmap_lookup_by_phandle(dev,
  64                                                 "mediatek,phy-mode");
  65                 if (IS_ERR(plat->mode)) {
  66                         dev_err(dev, "missing phy-mode phandle\n");
  67                         return PTR_ERR(plat->mode);
  68                 }
  69                 regmap_update_bits(plat->mode, SYS_CFG,
  70                                    SYS_CFG_SATA_MSK, SYS_CFG_SATA_EN);
  71         }
  72
  73         ofnode_read_u32(dev_ofnode(dev), "ports-implemented",
  74                         &hpriv->port_map);
  75         return 0;
  76 }
  77
  78 static int mtk_ahci_probe(struct udevice *dev)
  79 {
  80         struct mtk_ahci_priv *priv = dev_get_priv(dev);
  81         int ret;
  82         struct phy phy;
  83
  84         ret = mtk_ahci_parse_property(&priv->ahci_priv, dev);
  85         if (ret)
  86                 return ret;
  87
  88         ret = reset_get_bulk(dev, &priv->rst_bulk);
  89         if (!ret) {
  90                 reset_assert_bulk(&priv->rst_bulk);
  91                 reset_deassert_bulk(&priv->rst_bulk);
  92         } else {
  93                 dev_err(dev, "Failed to get reset: %d\n", ret);
  94         }
  95
  96         ret = generic_phy_get_by_name(dev, "sata-phy", &phy);
  97         if (ret) {
  98                 pr_err("can't get the phy from DT\n");
  99                 return ret;
 100         }
 101
 102         ret = generic_phy_init(&phy);
 103         if (ret) {
 104                 pr_err("unable to initialize the sata phy\n");
 105                 return ret;
 106         }
 107
 108         ret = generic_phy_power_on(&phy);
 109         if (ret) {
 110                 pr_err("unable to power on the sata phy\n");
 111                 return ret;
 112         }
 113
 114         return ahci_probe_scsi(dev, (ulong)priv->base);
 115 }
 116
 117 static const struct udevice_id mtk_ahci_ids[] = {
 118         { .compatible = "mediatek,mtk-ahci" },
 119         { }
 120 };
 121
 122 U_BOOT_DRIVER(mtk_ahci) = {
 123         .name   = "mtk_ahci",
 124         .id     = UCLASS_AHCI,
 125         .of_match = mtk_ahci_ids,
 126         .bind   = mtk_ahci_bind,
 127         .of_to_plat = mtk_ahci_of_to_plat,
 128         .ops    = &scsi_ops,
 129         .probe  = mtk_ahci_probe,
 130         .priv_auto      = sizeof(struct mtk_ahci_priv),
 131 };