1 // SPDX-License-Identifier: GPL-2.0-only
3 * MediaTek AHCI SATA driver
5 * Copyright (c) 2017 MediaTek Inc.
6 * Author: Ryder Lee <ryder.lee@mediatek.com>
9 #include <linux/ahci_platform.h>
10 #include <linux/kernel.h>
11 #include <linux/libata.h>
12 #include <linux/mfd/syscon.h>
13 #include <linux/module.h>
14 #include <linux/platform_device.h>
16 #include <linux/regmap.h>
17 #include <linux/reset.h>
20 #define DRV_NAME "ahci-mtk"
23 #define SYS_CFG_SATA_MSK GENMASK(31, 30)
24 #define SYS_CFG_SATA_EN BIT(31)
26 struct mtk_ahci_plat {
28 struct reset_control *axi_rst;
29 struct reset_control *sw_rst;
30 struct reset_control *reg_rst;
33 static const struct ata_port_info ahci_port_info = {
34 .flags = AHCI_FLAG_COMMON,
36 .udma_mask = ATA_UDMA6,
37 .port_ops = &ahci_platform_ops,
40 static struct scsi_host_template ahci_platform_sht = {
44 static int mtk_ahci_platform_resets(struct ahci_host_priv *hpriv,
47 struct mtk_ahci_plat *plat = hpriv->plat_data;
50 /* reset AXI bus and PHY part */
51 plat->axi_rst = devm_reset_control_get_optional_exclusive(dev, "axi");
52 if (PTR_ERR(plat->axi_rst) == -EPROBE_DEFER)
53 return PTR_ERR(plat->axi_rst);
55 plat->sw_rst = devm_reset_control_get_optional_exclusive(dev, "sw");
56 if (PTR_ERR(plat->sw_rst) == -EPROBE_DEFER)
57 return PTR_ERR(plat->sw_rst);
59 plat->reg_rst = devm_reset_control_get_optional_exclusive(dev, "reg");
60 if (PTR_ERR(plat->reg_rst) == -EPROBE_DEFER)
61 return PTR_ERR(plat->reg_rst);
63 err = reset_control_assert(plat->axi_rst);
65 dev_err(dev, "failed to assert AXI bus\n");
69 err = reset_control_assert(plat->sw_rst);
71 dev_err(dev, "failed to assert PHY digital part\n");
75 err = reset_control_assert(plat->reg_rst);
77 dev_err(dev, "failed to assert PHY register part\n");
81 err = reset_control_deassert(plat->reg_rst);
83 dev_err(dev, "failed to deassert PHY register part\n");
87 err = reset_control_deassert(plat->sw_rst);
89 dev_err(dev, "failed to deassert PHY digital part\n");
93 err = reset_control_deassert(plat->axi_rst);
95 dev_err(dev, "failed to deassert AXI bus\n");
102 static int mtk_ahci_parse_property(struct ahci_host_priv *hpriv,
105 struct mtk_ahci_plat *plat = hpriv->plat_data;
106 struct device_node *np = dev->of_node;
108 /* enable SATA function if needed */
109 if (of_find_property(np, "mediatek,phy-mode", NULL)) {
110 plat->mode = syscon_regmap_lookup_by_phandle(
111 np, "mediatek,phy-mode");
112 if (IS_ERR(plat->mode)) {
113 dev_err(dev, "missing phy-mode phandle\n");
114 return PTR_ERR(plat->mode);
117 regmap_update_bits(plat->mode, SYS_CFG, SYS_CFG_SATA_MSK,
121 of_property_read_u32(np, "ports-implemented", &hpriv->force_port_map);
126 static int mtk_ahci_probe(struct platform_device *pdev)
128 struct device *dev = &pdev->dev;
129 struct mtk_ahci_plat *plat;
130 struct ahci_host_priv *hpriv;
133 plat = devm_kzalloc(dev, sizeof(*plat), GFP_KERNEL);
137 hpriv = ahci_platform_get_resources(pdev, 0);
139 return PTR_ERR(hpriv);
141 hpriv->plat_data = plat;
143 err = mtk_ahci_parse_property(hpriv, dev);
147 err = mtk_ahci_platform_resets(hpriv, dev);
151 err = ahci_platform_enable_resources(hpriv);
155 err = ahci_platform_init_host(pdev, hpriv, &ahci_port_info,
158 goto disable_resources;
163 ahci_platform_disable_resources(hpriv);
167 static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_platform_suspend,
168 ahci_platform_resume);
170 static const struct of_device_id ahci_of_match[] = {
171 { .compatible = "mediatek,mtk-ahci", },
174 MODULE_DEVICE_TABLE(of, ahci_of_match);
176 static struct platform_driver mtk_ahci_driver = {
177 .probe = mtk_ahci_probe,
178 .remove = ata_platform_remove_one,
181 .of_match_table = ahci_of_match,
185 module_platform_driver(mtk_ahci_driver);
187 MODULE_DESCRIPTION("MediaTek SATA AHCI Driver");
188 MODULE_LICENSE("GPL v2");