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