1 // SPDX-License-Identifier: GPL-2.0-only 2 /* 3 * Copyright (C) 2012 STMicroelectronics Limited 4 * 5 * Authors: Francesco Virlinzi <francesco.virlinzi@st.com> 6 * Alexandre Torgue <alexandre.torgue@st.com> 7 */ 8 9 #include <linux/init.h> 10 #include <linux/module.h> 11 #include <linux/export.h> 12 #include <linux/platform_device.h> 13 #include <linux/clk.h> 14 #include <linux/of.h> 15 #include <linux/ahci_platform.h> 16 #include <linux/libata.h> 17 #include <linux/reset.h> 18 #include <linux/io.h> 19 #include <linux/dma-mapping.h> 20 21 #include "ahci.h" 22 23 #define DRV_NAME "st_ahci" 24 25 #define ST_AHCI_OOBR 0xbc 26 #define ST_AHCI_OOBR_WE BIT(31) 27 #define ST_AHCI_OOBR_CWMIN_SHIFT 24 28 #define ST_AHCI_OOBR_CWMAX_SHIFT 16 29 #define ST_AHCI_OOBR_CIMIN_SHIFT 8 30 #define ST_AHCI_OOBR_CIMAX_SHIFT 0 31 32 struct st_ahci_drv_data { 33 struct platform_device *ahci; 34 struct reset_control *pwr; 35 struct reset_control *sw_rst; 36 struct reset_control *pwr_rst; 37 }; 38 39 static void st_ahci_configure_oob(void __iomem *mmio) 40 { 41 unsigned long old_val, new_val; 42 43 new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) | 44 (0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) | 45 (0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) | 46 (0x0C << ST_AHCI_OOBR_CIMAX_SHIFT); 47 48 old_val = readl(mmio + ST_AHCI_OOBR); 49 writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR); 50 writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR); 51 writel(new_val, mmio + ST_AHCI_OOBR); 52 } 53 54 static int st_ahci_deassert_resets(struct ahci_host_priv *hpriv, 55 struct device *dev) 56 { 57 struct st_ahci_drv_data *drv_data = hpriv->plat_data; 58 int err; 59 60 if (drv_data->pwr) { 61 err = reset_control_deassert(drv_data->pwr); 62 if (err) { 63 dev_err(dev, "unable to bring out of pwrdwn\n"); 64 return err; 65 } 66 } 67 68 if (drv_data->sw_rst) { 69 err = reset_control_deassert(drv_data->sw_rst); 70 if (err) { 71 dev_err(dev, "unable to bring out of sw-rst\n"); 72 return err; 73 } 74 } 75 76 if (drv_data->pwr_rst) { 77 err = reset_control_deassert(drv_data->pwr_rst); 78 if (err) { 79 dev_err(dev, "unable to bring out of pwr-rst\n"); 80 return err; 81 } 82 } 83 84 return 0; 85 } 86 87 static void st_ahci_host_stop(struct ata_host *host) 88 { 89 struct ahci_host_priv *hpriv = host->private_data; 90 struct st_ahci_drv_data *drv_data = hpriv->plat_data; 91 struct device *dev = host->dev; 92 int err; 93 94 if (drv_data->pwr) { 95 err = reset_control_assert(drv_data->pwr); 96 if (err) 97 dev_err(dev, "unable to pwrdwn\n"); 98 } 99 100 ahci_platform_disable_resources(hpriv); 101 } 102 103 static int st_ahci_probe_resets(struct ahci_host_priv *hpriv, 104 struct device *dev) 105 { 106 struct st_ahci_drv_data *drv_data = hpriv->plat_data; 107 108 drv_data->pwr = devm_reset_control_get(dev, "pwr-dwn"); 109 if (IS_ERR(drv_data->pwr)) { 110 dev_info(dev, "power reset control not defined\n"); 111 drv_data->pwr = NULL; 112 } 113 114 drv_data->sw_rst = devm_reset_control_get(dev, "sw-rst"); 115 if (IS_ERR(drv_data->sw_rst)) { 116 dev_info(dev, "soft reset control not defined\n"); 117 drv_data->sw_rst = NULL; 118 } 119 120 drv_data->pwr_rst = devm_reset_control_get(dev, "pwr-rst"); 121 if (IS_ERR(drv_data->pwr_rst)) { 122 dev_dbg(dev, "power soft reset control not defined\n"); 123 drv_data->pwr_rst = NULL; 124 } 125 126 return st_ahci_deassert_resets(hpriv, dev); 127 } 128 129 static struct ata_port_operations st_ahci_port_ops = { 130 .inherits = &ahci_platform_ops, 131 .host_stop = st_ahci_host_stop, 132 }; 133 134 static const struct ata_port_info st_ahci_port_info = { 135 .flags = AHCI_FLAG_COMMON, 136 .pio_mask = ATA_PIO4, 137 .udma_mask = ATA_UDMA6, 138 .port_ops = &st_ahci_port_ops, 139 }; 140 141 static struct scsi_host_template ahci_platform_sht = { 142 AHCI_SHT(DRV_NAME), 143 }; 144 145 static int st_ahci_probe(struct platform_device *pdev) 146 { 147 struct st_ahci_drv_data *drv_data; 148 struct ahci_host_priv *hpriv; 149 int err; 150 151 drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL); 152 if (!drv_data) 153 return -ENOMEM; 154 155 hpriv = ahci_platform_get_resources(pdev, 0); 156 if (IS_ERR(hpriv)) 157 return PTR_ERR(hpriv); 158 hpriv->plat_data = drv_data; 159 160 err = st_ahci_probe_resets(hpriv, &pdev->dev); 161 if (err) 162 return err; 163 164 err = ahci_platform_enable_resources(hpriv); 165 if (err) 166 return err; 167 168 st_ahci_configure_oob(hpriv->mmio); 169 170 err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info, 171 &ahci_platform_sht); 172 if (err) { 173 ahci_platform_disable_resources(hpriv); 174 return err; 175 } 176 177 return 0; 178 } 179 180 #ifdef CONFIG_PM_SLEEP 181 static int st_ahci_suspend(struct device *dev) 182 { 183 struct ata_host *host = dev_get_drvdata(dev); 184 struct ahci_host_priv *hpriv = host->private_data; 185 struct st_ahci_drv_data *drv_data = hpriv->plat_data; 186 int err; 187 188 err = ahci_platform_suspend_host(dev); 189 if (err) 190 return err; 191 192 if (drv_data->pwr) { 193 err = reset_control_assert(drv_data->pwr); 194 if (err) { 195 dev_err(dev, "unable to pwrdwn"); 196 return err; 197 } 198 } 199 200 ahci_platform_disable_resources(hpriv); 201 202 return 0; 203 } 204 205 static int st_ahci_resume(struct device *dev) 206 { 207 struct ata_host *host = dev_get_drvdata(dev); 208 struct ahci_host_priv *hpriv = host->private_data; 209 int err; 210 211 err = ahci_platform_enable_resources(hpriv); 212 if (err) 213 return err; 214 215 err = st_ahci_deassert_resets(hpriv, dev); 216 if (err) { 217 ahci_platform_disable_resources(hpriv); 218 return err; 219 } 220 221 st_ahci_configure_oob(hpriv->mmio); 222 223 return ahci_platform_resume_host(dev); 224 } 225 #endif 226 227 static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume); 228 229 static const struct of_device_id st_ahci_match[] = { 230 { .compatible = "st,ahci", }, 231 { /* sentinel */ } 232 }; 233 MODULE_DEVICE_TABLE(of, st_ahci_match); 234 235 static struct platform_driver st_ahci_driver = { 236 .driver = { 237 .name = DRV_NAME, 238 .pm = &st_ahci_pm_ops, 239 .of_match_table = st_ahci_match, 240 }, 241 .probe = st_ahci_probe, 242 .remove = ata_platform_remove_one, 243 }; 244 module_platform_driver(st_ahci_driver); 245 246 MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>"); 247 MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>"); 248 MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver"); 249 MODULE_LICENSE("GPL v2"); 250