ahci: mediatek: add ahci driver

add AHCI driver ported from linux

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/ata/ahci_mtk.c

Signed-off-by: Frank Wunderlich <frank-w@public-files.de>

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index d8c9756c2afc057383e90bbbf27a65697be6a3d1..f2f8275aeca82a51239d242d8ed424106cedc318 100644 (file)
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -130,4 +130,12 @@ config AHCI_MVEBU
          onboard AHCI SATA.
 
          If unsure, say N.
+
+config MTK_AHCI
+       bool "Enable Mediatek AHCI driver support"
+       depends on AHCI
+       help
+         Enable this driver to support Sata devices through
+         Mediatek AHCI controller (e.g. MT7622).
+
 endmenu

diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index a69edb10f7a0901d3a9d3edaa47bfd5431b67d28..98fb4807008e7c20947156800050ee2a36f7599b 100644 (file)
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -19,3 +19,4 @@ obj-$(CONFIG_SATA_SIL) += sata_sil.o
 obj-$(CONFIG_SANDBOX) += sata_sandbox.o
 obj-$(CONFIG_AHCI_MVEBU) += ahci_mvebu.o
 obj-$(CONFIG_SUNXI_AHCI) += ahci_sunxi.o
+obj-$(CONFIG_MTK_AHCI) += mtk_ahci.o

diff --git a/drivers/ata/mtk_ahci.c b/drivers/ata/mtk_ahci.c
new file mode 100644 (file)
index 0000000..8e09c5f
--- /dev/null
+++ b/drivers/ata/mtk_ahci.c
@@ -0,0 +1,130 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * MTK SATA platform driver
+ *
+ * (C) Copyright 2020
+ *     Mediatek
+ *
+ * Author: Frank Wunderlich <frank-w@public-files.de>
+ * based on https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/ata/ahci_mtk.c
+ * Author: Ryder Lee <ryder.lee@mediatek.com>
+ */
+
+#include <common.h>
+#include <ahci.h>
+#include <asm/io.h>
+#include <dm.h>
+#include <dm/of_access.h>
+#include <generic-phy.h>
+#include <linux/err.h>
+#include <regmap.h>
+#include <reset.h>
+#include <sata.h>
+#include <scsi.h>
+#include <syscon.h>
+
+#define SYS_CFG                        0x14
+#define SYS_CFG_SATA_MSK       GENMASK(31, 30)
+#define SYS_CFG_SATA_EN                BIT(31)
+
+struct mtk_ahci_priv {
+       void *base;
+
+       struct ahci_uc_priv ahci_priv;
+       struct regmap *mode;
+       struct reset_ctl_bulk rst_bulk;
+};
+
+static int mtk_ahci_bind(struct udevice *dev)
+{
+       struct udevice *scsi_dev;
+
+       return ahci_bind_scsi(dev, &scsi_dev);
+}
+
+static int mtk_ahci_ofdata_to_platdata(struct udevice *dev)
+{
+       struct mtk_ahci_priv *priv = dev_get_priv(dev);
+
+       priv->base = devfdt_remap_addr_index(dev, 0);
+
+       return 0;
+}
+
+static int mtk_ahci_parse_property(struct ahci_uc_priv *hpriv,
+                                  struct udevice *dev)
+{
+       struct mtk_ahci_priv *plat = dev_get_priv(dev);
+       const void *fdt = gd->fdt_blob;
+
+       /* enable SATA function if needed */
+       if (fdt_get_property(fdt, dev_of_offset(dev),
+                            "mediatek,phy-mode", NULL)) {
+               plat->mode = syscon_regmap_lookup_by_phandle(dev,
+                                               "mediatek,phy-mode");
+               if (IS_ERR(plat->mode)) {
+                       dev_err(dev, "missing phy-mode phandle\n");
+                       return PTR_ERR(plat->mode);
+               }
+               regmap_update_bits(plat->mode, SYS_CFG,
+                                  SYS_CFG_SATA_MSK, SYS_CFG_SATA_EN);
+       }
+
+       ofnode_read_u32(dev->node, "ports-implemented", &hpriv->port_map);
+       return 0;
+}
+
+static int mtk_ahci_probe(struct udevice *dev)
+{
+       struct mtk_ahci_priv *priv = dev_get_priv(dev);
+       int ret;
+       struct phy phy;
+
+       ret = mtk_ahci_parse_property(&priv->ahci_priv, dev);
+       if (ret)
+               return ret;
+
+       ret = reset_get_bulk(dev, &priv->rst_bulk);
+       if (!ret) {
+               reset_assert_bulk(&priv->rst_bulk);
+               reset_deassert_bulk(&priv->rst_bulk);
+       } else {
+               dev_err(dev, "Failed to get reset: %d\n", ret);
+       }
+
+       ret = generic_phy_get_by_name(dev, "sata-phy", &phy);
+       if (ret) {
+               pr_err("can't get the phy from DT\n");
+               return ret;
+       }
+
+       ret = generic_phy_init(&phy);
+       if (ret) {
+               pr_err("unable to initialize the sata phy\n");
+               return ret;
+       }
+
+       ret = generic_phy_power_on(&phy);
+       if (ret) {
+               pr_err("unable to power on the sata phy\n");
+               return ret;
+       }
+
+       return ahci_probe_scsi(dev, (ulong)priv->base);
+}
+
+static const struct udevice_id mtk_ahci_ids[] = {
+       { .compatible = "mediatek,mtk-ahci" },
+       { }
+};
+
+U_BOOT_DRIVER(mtk_ahci) = {
+       .name   = "mtk_ahci",
+       .id     = UCLASS_AHCI,
+       .of_match = mtk_ahci_ids,
+       .bind   = mtk_ahci_bind,
+       .ofdata_to_platdata = mtk_ahci_ofdata_to_platdata,
+       .ops    = &scsi_ops,
+       .probe  = mtk_ahci_probe,
+       .priv_auto_alloc_size = sizeof(struct mtk_ahci_priv),
+};