2 * MediaTek AHCI SATA driver
4 * Copyright (c) 2017 MediaTek Inc.
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
17 #include <linux/ahci_platform.h>
18 #include <linux/kernel.h>
19 #include <linux/libata.h>
20 #include <linux/mfd/syscon.h>
21 #include <linux/module.h>
22 #include <linux/platform_device.h>
24 #include <linux/regmap.h>
25 #include <linux/reset.h>
28 #define DRV_NAME "ahci-mtk"
31 #define SYS_CFG_SATA_MSK GENMASK(31, 30)
32 #define SYS_CFG_SATA_EN BIT(31)
34 struct mtk_ahci_plat {
36 struct reset_control *axi_rst;
37 struct reset_control *sw_rst;
38 struct reset_control *reg_rst;
41 static const struct ata_port_info ahci_port_info = {
42 .flags = AHCI_FLAG_COMMON,
44 .udma_mask = ATA_UDMA6,
45 .port_ops = &ahci_platform_ops,
48 static struct scsi_host_template ahci_platform_sht = {
52 static int mtk_ahci_platform_resets(struct ahci_host_priv *hpriv,
55 struct mtk_ahci_plat *plat = hpriv->plat_data;
58 /* reset AXI bus and PHY part */
59 plat->axi_rst = devm_reset_control_get_optional_exclusive(dev, "axi");
60 if (PTR_ERR(plat->axi_rst) == -EPROBE_DEFER)
61 return PTR_ERR(plat->axi_rst);
63 plat->sw_rst = devm_reset_control_get_optional_exclusive(dev, "sw");
64 if (PTR_ERR(plat->sw_rst) == -EPROBE_DEFER)
65 return PTR_ERR(plat->sw_rst);
67 plat->reg_rst = devm_reset_control_get_optional_exclusive(dev, "reg");
68 if (PTR_ERR(plat->reg_rst) == -EPROBE_DEFER)
69 return PTR_ERR(plat->reg_rst);
71 err = reset_control_assert(plat->axi_rst);
73 dev_err(dev, "failed to assert AXI bus\n");
77 err = reset_control_assert(plat->sw_rst);
79 dev_err(dev, "failed to assert PHY digital part\n");
83 err = reset_control_assert(plat->reg_rst);
85 dev_err(dev, "failed to assert PHY register part\n");
89 err = reset_control_deassert(plat->reg_rst);
91 dev_err(dev, "failed to deassert PHY register part\n");
95 err = reset_control_deassert(plat->sw_rst);
97 dev_err(dev, "failed to deassert PHY digital part\n");
101 err = reset_control_deassert(plat->axi_rst);
103 dev_err(dev, "failed to deassert AXI bus\n");
110 static int mtk_ahci_parse_property(struct ahci_host_priv *hpriv,
113 struct mtk_ahci_plat *plat = hpriv->plat_data;
114 struct device_node *np = dev->of_node;
116 /* enable SATA function if needed */
117 if (of_find_property(np, "mediatek,phy-mode", NULL)) {
118 plat->mode = syscon_regmap_lookup_by_phandle(
119 np, "mediatek,phy-mode");
120 if (IS_ERR(plat->mode)) {
121 dev_err(dev, "missing phy-mode phandle\n");
122 return PTR_ERR(plat->mode);
125 regmap_update_bits(plat->mode, SYS_CFG, SYS_CFG_SATA_MSK,
129 of_property_read_u32(np, "ports-implemented", &hpriv->force_port_map);
134 static int mtk_ahci_probe(struct platform_device *pdev)
136 struct device *dev = &pdev->dev;
137 struct mtk_ahci_plat *plat;
138 struct ahci_host_priv *hpriv;
141 plat = devm_kzalloc(dev, sizeof(*plat), GFP_KERNEL);
145 hpriv = ahci_platform_get_resources(pdev, 0);
147 return PTR_ERR(hpriv);
149 hpriv->plat_data = plat;
151 err = mtk_ahci_parse_property(hpriv, dev);
155 err = mtk_ahci_platform_resets(hpriv, dev);
159 err = ahci_platform_enable_resources(hpriv);
163 err = ahci_platform_init_host(pdev, hpriv, &ahci_port_info,
166 goto disable_resources;
171 ahci_platform_disable_resources(hpriv);
175 static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_platform_suspend,
176 ahci_platform_resume);
178 static const struct of_device_id ahci_of_match[] = {
179 { .compatible = "mediatek,mtk-ahci", },
182 MODULE_DEVICE_TABLE(of, ahci_of_match);
184 static struct platform_driver mtk_ahci_driver = {
185 .probe = mtk_ahci_probe,
186 .remove = ata_platform_remove_one,
189 .of_match_table = ahci_of_match,
193 module_platform_driver(mtk_ahci_driver);
195 MODULE_DESCRIPTION("MediaTek SATA AHCI Driver");
196 MODULE_LICENSE("GPL v2");