drivers/ata/ahci_st.c

   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 device *dev = &pdev->dev;
 148         struct st_ahci_drv_data *drv_data;
 149         struct ahci_host_priv *hpriv;
 150         int err;
 151
 152         drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
 153         if (!drv_data)
 154                 return -ENOMEM;
 155
 156         hpriv = ahci_platform_get_resources(pdev, 0);
 157         if (IS_ERR(hpriv))
 158                 return PTR_ERR(hpriv);
 159         hpriv->plat_data = drv_data;
 160
 161         err = st_ahci_probe_resets(hpriv, &pdev->dev);
 162         if (err)
 163                 return err;
 164
 165         err = ahci_platform_enable_resources(hpriv);
 166         if (err)
 167                 return err;
 168
 169         st_ahci_configure_oob(hpriv->mmio);
 170
 171         of_property_read_u32(dev->of_node,
 172                              "ports-implemented", &hpriv->force_port_map);
 173
 174         err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info,
 175                                       &ahci_platform_sht);
 176         if (err) {
 177                 ahci_platform_disable_resources(hpriv);
 178                 return err;
 179         }
 180
 181         return 0;
 182 }
 183
 184 #ifdef CONFIG_PM_SLEEP
 185 static int st_ahci_suspend(struct device *dev)
 186 {
 187         struct ata_host *host = dev_get_drvdata(dev);
 188         struct ahci_host_priv *hpriv = host->private_data;
 189         struct st_ahci_drv_data *drv_data = hpriv->plat_data;
 190         int err;
 191
 192         err = ahci_platform_suspend_host(dev);
 193         if (err)
 194                 return err;
 195
 196         if (drv_data->pwr) {
 197                 err = reset_control_assert(drv_data->pwr);
 198                 if (err) {
 199                         dev_err(dev, "unable to pwrdwn");
 200                         return err;
 201                 }
 202         }
 203
 204         ahci_platform_disable_resources(hpriv);
 205
 206         return 0;
 207 }
 208
 209 static int st_ahci_resume(struct device *dev)
 210 {
 211         struct ata_host *host = dev_get_drvdata(dev);
 212         struct ahci_host_priv *hpriv = host->private_data;
 213         int err;
 214
 215         err = ahci_platform_enable_resources(hpriv);
 216         if (err)
 217                 return err;
 218
 219         err = st_ahci_deassert_resets(hpriv, dev);
 220         if (err) {
 221                 ahci_platform_disable_resources(hpriv);
 222                 return err;
 223         }
 224
 225         st_ahci_configure_oob(hpriv->mmio);
 226
 227         return ahci_platform_resume_host(dev);
 228 }
 229 #endif
 230
 231 static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
 232
 233 static const struct of_device_id st_ahci_match[] = {
 234         { .compatible = "st,ahci", },
 235         {},
 236 };
 237 MODULE_DEVICE_TABLE(of, st_ahci_match);
 238
 239 static struct platform_driver st_ahci_driver = {
 240         .driver = {
 241                 .name = DRV_NAME,
 242                 .pm = &st_ahci_pm_ops,
 243                 .of_match_table = of_match_ptr(st_ahci_match),
 244         },
 245         .probe = st_ahci_probe,
 246         .remove = ata_platform_remove_one,
 247 };
 248 module_platform_driver(st_ahci_driver);
 249
 250 MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
 251 MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
 252 MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
 253 MODULE_LICENSE("GPL v2");