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Subject[PATCH 1/2] ata: mediatek: add support for MediaTek SATA controller
Date
This adds support the AHCI-compliant Serial ATA controller present
on MediaTek SoCs.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
---
drivers/ata/Kconfig | 10 +++
drivers/ata/Makefile | 1 +
drivers/ata/ahci_mtk.c | 196 +++++++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 207 insertions(+)
create mode 100644 drivers/ata/ahci_mtk.c

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 948fc86..7d3eb47 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -153,6 +153,16 @@ config AHCI_CEVA

If unsure, say N.

+config AHCI_MTK
+ tristate "MediaTek AHCI SATA support"
+ depends on ARCH_MEDIATEK
+ select MFD_SYSCON
+ help
+ This option enables support for the MediaTek SoC's
+ onboard AHCI SATA controller.
+
+ If unsure, say N.
+
config AHCI_MVEBU
tristate "Marvell EBU AHCI SATA support"
depends on ARCH_MVEBU
diff --git a/drivers/ata/Makefile b/drivers/ata/Makefile
index a26ef5a..ff9cd2e 100644
--- a/drivers/ata/Makefile
+++ b/drivers/ata/Makefile
@@ -17,6 +17,7 @@ obj-$(CONFIG_AHCI_CEVA) += ahci_ceva.o libahci.o libahci_platform.o
obj-$(CONFIG_AHCI_DA850) += ahci_da850.o libahci.o libahci_platform.o
obj-$(CONFIG_AHCI_DM816) += ahci_dm816.o libahci.o libahci_platform.o
obj-$(CONFIG_AHCI_IMX) += ahci_imx.o libahci.o libahci_platform.o
+obj-$(CONFIG_AHCI_MTK) += ahci_mtk.o libahci.o libahci_platform.o
obj-$(CONFIG_AHCI_MVEBU) += ahci_mvebu.o libahci.o libahci_platform.o
obj-$(CONFIG_AHCI_OCTEON) += ahci_octeon.o
obj-$(CONFIG_AHCI_SUNXI) += ahci_sunxi.o libahci.o libahci_platform.o
diff --git a/drivers/ata/ahci_mtk.c b/drivers/ata/ahci_mtk.c
new file mode 100644
index 0000000..220dce6
--- /dev/null
+++ b/drivers/ata/ahci_mtk.c
@@ -0,0 +1,196 @@
+/*
+ * MeidaTek AHCI SATA driver
+ *
+ * Copyright (c) 2017 MediaTek Inc.
+ * Author: Ryder Lee <ryder.lee@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/ahci_platform.h>
+#include <linux/kernel.h>
+#include <linux/libata.h>
+#include <linux/mfd/syscon.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/pm.h>
+#include <linux/regmap.h>
+#include <linux/reset.h>
+#include "ahci.h"
+
+#define DRV_NAME "ahci"
+
+#define SYS_CFG 0x14
+#define SYS_CFG_SATA_MSK GENMASK(31, 30)
+#define SYS_CFG_SATA_EN BIT(31)
+
+struct mtk_ahci_drv_data {
+ struct regmap *mode;
+ struct reset_control *axi_rst;
+ struct reset_control *sw_rst;
+ struct reset_control *reg_rst;
+};
+
+static const struct ata_port_info ahci_port_info = {
+ .flags = AHCI_FLAG_COMMON,
+ .pio_mask = ATA_PIO4,
+ .udma_mask = ATA_UDMA6,
+ .port_ops = &ahci_platform_ops,
+};
+
+static struct scsi_host_template ahci_platform_sht = {
+ AHCI_SHT(DRV_NAME),
+};
+
+static int mtk_ahci_platform_resets(struct ahci_host_priv *hpriv,
+ struct device *dev)
+{
+ struct mtk_ahci_drv_data *drv_data = hpriv->plat_data;
+ int err;
+
+ /* reset AXI bus and phy part */
+ drv_data->axi_rst = devm_reset_control_get_optional(dev, "axi-rst");
+ if (IS_ERR(drv_data->axi_rst) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ drv_data->sw_rst = devm_reset_control_get_optional(dev, "sw-rst");
+ if (IS_ERR(drv_data->sw_rst) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ drv_data->reg_rst = devm_reset_control_get_optional(dev, "reg-rst");
+ if (IS_ERR(drv_data->reg_rst) == -EPROBE_DEFER)
+ return -EPROBE_DEFER;
+
+ err = reset_control_assert(drv_data->axi_rst);
+ if (err) {
+ dev_err(dev, "assert axi bus failed\n");
+ return err;
+ }
+
+ err = reset_control_assert(drv_data->sw_rst);
+ if (err) {
+ dev_err(dev, "assert phy digital part failed\n");
+ return err;
+ }
+
+ err = reset_control_assert(drv_data->reg_rst);
+ if (err) {
+ dev_err(dev, "assert phy register part failed\n");
+ return err;
+ }
+
+ err = reset_control_deassert(drv_data->reg_rst);
+ if (err) {
+ dev_err(dev, "deassert phy register part failed\n");
+ return err;
+ }
+
+ err = reset_control_deassert(drv_data->sw_rst);
+ if (err) {
+ dev_err(dev, "deassert phy digital part failed\n");
+ return err;
+ }
+
+ err = reset_control_deassert(drv_data->axi_rst);
+ if (err) {
+ dev_err(dev, "deassert axi bus failed\n");
+ return err;
+ }
+
+ return 0;
+}
+
+static int mtk_ahci_parse_property(struct ahci_host_priv *hpriv,
+ struct device *dev)
+{
+ struct mtk_ahci_drv_data *drv_data = hpriv->plat_data;
+ struct device_node *np = dev->of_node;
+
+ /* enable SATA function if needed */
+ if (of_find_property(np, "mediatek,phy-mode", NULL)) {
+ drv_data->mode = syscon_regmap_lookup_by_phandle(
+ np, "mediatek,phy-mode");
+ if (IS_ERR(drv_data->mode)) {
+ dev_err(dev, "missing phy-mode phandle\n");
+ return PTR_ERR(drv_data->mode);
+ }
+
+ regmap_update_bits(drv_data->mode, SYS_CFG, SYS_CFG_SATA_MSK,
+ SYS_CFG_SATA_EN);
+ }
+
+ of_property_read_u32(np, "ports-implemented", &hpriv->force_port_map);
+
+ return 0;
+}
+
+static int mtk_ahci_probe(struct platform_device *pdev)
+{
+ struct device *dev = &pdev->dev;
+ struct mtk_ahci_drv_data *drv_data;
+ struct ahci_host_priv *hpriv;
+ int err;
+
+ drv_data = devm_kzalloc(dev, sizeof(*drv_data), GFP_KERNEL);
+ if (!drv_data)
+ return -ENOMEM;
+
+ hpriv = ahci_platform_get_resources(pdev);
+ if (IS_ERR(hpriv))
+ return PTR_ERR(hpriv);
+
+ hpriv->plat_data = drv_data;
+
+ err = mtk_ahci_parse_property(hpriv, dev);
+ if (err)
+ return err;
+
+ err = mtk_ahci_platform_resets(hpriv, dev);
+ if (err)
+ return err;
+
+ err = ahci_platform_enable_resources(hpriv);
+ if (err)
+ return err;
+
+ err = ahci_platform_init_host(pdev, hpriv, &ahci_port_info,
+ &ahci_platform_sht);
+ if (err)
+ goto disable_resources;
+
+ return 0;
+
+disable_resources:
+ ahci_platform_disable_resources(hpriv);
+ return err;
+}
+
+static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_platform_suspend,
+ ahci_platform_resume);
+
+static const struct of_device_id ahci_of_match[] = {
+ { .compatible = "mediatek,ahci", },
+ {},
+};
+MODULE_DEVICE_TABLE(of, ahci_of_match);
+
+static struct platform_driver mtk_ahci_driver = {
+ .probe = mtk_ahci_probe,
+ .remove = ata_platform_remove_one,
+ .driver = {
+ .name = DRV_NAME,
+ .of_match_table = ahci_of_match,
+ .pm = &ahci_pm_ops,
+ },
+};
+module_platform_driver(mtk_ahci_driver);
+
+MODULE_DESCRIPTION("MeidaTek SATA AHCI Driver");
+MODULE_LICENSE("GPL v2");
--
1.9.1
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