[PATCH v1 04/10] ahci: mediatek: add ahci driver

Frank Wunderlich
2020-08-16T08:24:25Z

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>
---
drivers/ata/Kconfig | 8 +++
drivers/ata/Makefile | 1 +
drivers/ata/mtk_ahci.c | 130 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 139 insertions(+)
create mode 100644 drivers/ata/mtk_ahci.c

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index d8c9756c2a..f2f8275aec 100644
--- 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 a69edb10f7..98fb480700 100644
--- 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
index 0000000000..8e09c5f9e6
--- /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),
+};
--
2.25.1