1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * MediaTek AHCI SATA driver 4 * 5 * Copyright (c) 2017 MediaTek Inc. 6 * Author: Ryder Lee <ryder.lee@mediatek.com> 7 */ 8 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> 15 #include <linux/pm.h> 16 #include <linux/regmap.h> 17 #include <linux/reset.h> 18 #include "ahci.h" 19 20 #define DRV_NAME "ahci-mtk" 21 22 #define SYS_CFG 0x14 23 #define SYS_CFG_SATA_MSK GENMASK(31, 30) 24 #define SYS_CFG_SATA_EN BIT(31) 25 26 struct mtk_ahci_plat { 27 struct regmap *mode; 28 struct reset_control *axi_rst; 29 struct reset_control *sw_rst; 30 struct reset_control *reg_rst; 31 }; 32 33 static const struct ata_port_info ahci_port_info = { 34 .flags = AHCI_FLAG_COMMON, 35 .pio_mask = ATA_PIO4, 36 .udma_mask = ATA_UDMA6, 37 .port_ops = &ahci_platform_ops, 38 }; 39 40 static const struct scsi_host_template ahci_platform_sht = { 41 AHCI_SHT(DRV_NAME), 42 }; 43 44 static int mtk_ahci_platform_resets(struct ahci_host_priv *hpriv, 45 struct device *dev) 46 { 47 struct mtk_ahci_plat *plat = hpriv->plat_data; 48 int err; 49 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); 54 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); 58 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); 62 63 err = reset_control_assert(plat->axi_rst); 64 if (err) { 65 dev_err(dev, "failed to assert AXI bus\n"); 66 return err; 67 } 68 69 err = reset_control_assert(plat->sw_rst); 70 if (err) { 71 dev_err(dev, "failed to assert PHY digital part\n"); 72 return err; 73 } 74 75 err = reset_control_assert(plat->reg_rst); 76 if (err) { 77 dev_err(dev, "failed to assert PHY register part\n"); 78 return err; 79 } 80 81 err = reset_control_deassert(plat->reg_rst); 82 if (err) { 83 dev_err(dev, "failed to deassert PHY register part\n"); 84 return err; 85 } 86 87 err = reset_control_deassert(plat->sw_rst); 88 if (err) { 89 dev_err(dev, "failed to deassert PHY digital part\n"); 90 return err; 91 } 92 93 err = reset_control_deassert(plat->axi_rst); 94 if (err) { 95 dev_err(dev, "failed to deassert AXI bus\n"); 96 return err; 97 } 98 99 return 0; 100 } 101 102 static int mtk_ahci_parse_property(struct ahci_host_priv *hpriv, 103 struct device *dev) 104 { 105 struct mtk_ahci_plat *plat = hpriv->plat_data; 106 struct device_node *np = dev->of_node; 107 108 /* enable SATA function if needed */ 109 if (of_property_present(np, "mediatek,phy-mode")) { 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); 115 } 116 117 regmap_update_bits(plat->mode, SYS_CFG, SYS_CFG_SATA_MSK, 118 SYS_CFG_SATA_EN); 119 } 120 121 return 0; 122 } 123 124 static int mtk_ahci_probe(struct platform_device *pdev) 125 { 126 struct device *dev = &pdev->dev; 127 struct mtk_ahci_plat *plat; 128 struct ahci_host_priv *hpriv; 129 int err; 130 131 plat = devm_kzalloc(dev, sizeof(*plat), GFP_KERNEL); 132 if (!plat) 133 return -ENOMEM; 134 135 hpriv = ahci_platform_get_resources(pdev, 0); 136 if (IS_ERR(hpriv)) 137 return PTR_ERR(hpriv); 138 139 hpriv->plat_data = plat; 140 141 err = mtk_ahci_parse_property(hpriv, dev); 142 if (err) 143 return err; 144 145 err = mtk_ahci_platform_resets(hpriv, dev); 146 if (err) 147 return err; 148 149 err = ahci_platform_enable_resources(hpriv); 150 if (err) 151 return err; 152 153 err = ahci_platform_init_host(pdev, hpriv, &ahci_port_info, 154 &ahci_platform_sht); 155 if (err) 156 goto disable_resources; 157 158 return 0; 159 160 disable_resources: 161 ahci_platform_disable_resources(hpriv); 162 return err; 163 } 164 165 static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_platform_suspend, 166 ahci_platform_resume); 167 168 static const struct of_device_id ahci_of_match[] = { 169 { .compatible = "mediatek,mtk-ahci", }, 170 { /* sentinel */ } 171 }; 172 MODULE_DEVICE_TABLE(of, ahci_of_match); 173 174 static struct platform_driver mtk_ahci_driver = { 175 .probe = mtk_ahci_probe, 176 .remove = ata_platform_remove_one, 177 .driver = { 178 .name = DRV_NAME, 179 .of_match_table = ahci_of_match, 180 .pm = &ahci_pm_ops, 181 }, 182 }; 183 module_platform_driver(mtk_ahci_driver); 184 185 MODULE_DESCRIPTION("MediaTek SATA AHCI Driver"); 186 MODULE_LICENSE("GPL v2"); 187