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