ata: mediatek: add support for MediaTek SATA controller

This adds support the AHCI-compliant Serial ATA controller present
on MediaTek SoCs.

Signed-off-by: Ryder Lee <ryder.lee@mediatek.com>
Acked-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 948fc86..7d3eb47 100644 (file)
--- 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 (file)
--- 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 (file)
index 0000000..80854f7
--- /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_plat {
+       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_plat *plat = hpriv->plat_data;
+       int err;
+
+       /* reset AXI bus and PHY part */
+       plat->axi_rst = devm_reset_control_get_optional_exclusive(dev, "axi");
+       if (PTR_ERR(plat->axi_rst) == -EPROBE_DEFER)
+               return PTR_ERR(plat->axi_rst);
+
+       plat->sw_rst = devm_reset_control_get_optional_exclusive(dev, "sw");
+       if (PTR_ERR(plat->sw_rst) == -EPROBE_DEFER)
+               return PTR_ERR(plat->sw_rst);
+
+       plat->reg_rst = devm_reset_control_get_optional_exclusive(dev, "reg");
+       if (PTR_ERR(plat->reg_rst) == -EPROBE_DEFER)
+               return PTR_ERR(plat->reg_rst);
+
+       err = reset_control_assert(plat->axi_rst);
+       if (err) {
+               dev_err(dev, "failed to assert AXI bus\n");
+               return err;
+       }
+
+       err = reset_control_assert(plat->sw_rst);
+       if (err) {
+               dev_err(dev, "failed to assert PHY digital part\n");
+               return err;
+       }
+
+       err = reset_control_assert(plat->reg_rst);
+       if (err) {
+               dev_err(dev, "failed to assert PHY register part\n");
+               return err;
+       }
+
+       err = reset_control_deassert(plat->reg_rst);
+       if (err) {
+               dev_err(dev, "failed to deassert PHY register part\n");
+               return err;
+       }
+
+       err = reset_control_deassert(plat->sw_rst);
+       if (err) {
+               dev_err(dev, "failed to deassert PHY digital part\n");
+               return err;
+       }
+
+       err = reset_control_deassert(plat->axi_rst);
+       if (err) {
+               dev_err(dev, "failed to deassert AXI bus\n");
+               return err;
+       }
+
+       return 0;
+}
+
+static int mtk_ahci_parse_property(struct ahci_host_priv *hpriv,
+                                  struct device *dev)
+{
+       struct mtk_ahci_plat *plat = hpriv->plat_data;
+       struct device_node *np = dev->of_node;
+
+       /* enable SATA function if needed */
+       if (of_find_property(np, "mediatek,phy-mode", NULL)) {
+               plat->mode = syscon_regmap_lookup_by_phandle(
+                                       np, "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);
+       }
+
+       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_plat *plat;
+       struct ahci_host_priv *hpriv;
+       int err;
+
+       plat = devm_kzalloc(dev, sizeof(*plat), GFP_KERNEL);
+       if (!plat)
+               return -ENOMEM;
+
+       hpriv = ahci_platform_get_resources(pdev);
+       if (IS_ERR(hpriv))
+               return PTR_ERR(hpriv);
+
+       hpriv->plat_data = plat;
+
+       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,mtk-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");