drivers/ata/ahci_st.c

   1 /*
   2  * Copyright (C) 2012 STMicroelectronics Limited
   3  *
   4  * Authors: Francesco Virlinzi <francesco.virlinzi@st.com>
   5  *          Alexandre Torgue <alexandre.torgue@st.com>
   6  *
   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.
  10  */
  11
  12 #include <linux/init.h>
  13 #include <linux/module.h>
  14 #include <linux/export.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/clk.h>
  17 #include <linux/of.h>
  18 #include <linux/ahci_platform.h>
  19 #include <linux/libata.h>
  20 #include <linux/reset.h>
  21 #include <linux/io.h>
  22 #include <linux/dma-mapping.h>
  23
  24 #include "ahci.h"
  25
  26 #define DRV_NAME  "st_ahci"
  27
  28 #define ST_AHCI_OOBR                    0xbc
  29 #define ST_AHCI_OOBR_WE                 BIT(31)
  30 #define ST_AHCI_OOBR_CWMIN_SHIFT        24
  31 #define ST_AHCI_OOBR_CWMAX_SHIFT        16
  32 #define ST_AHCI_OOBR_CIMIN_SHIFT        8
  33 #define ST_AHCI_OOBR_CIMAX_SHIFT        0
  34
  35 struct st_ahci_drv_data {
  36         struct platform_device *ahci;
  37         struct reset_control *pwr;
  38         struct reset_control *sw_rst;
  39         struct reset_control *pwr_rst;
  40 };
  41
  42 static void st_ahci_configure_oob(void __iomem *mmio)
  43 {
  44         unsigned long old_val, new_val;
  45
  46         new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) |
  47                   (0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) |
  48                   (0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) |
  49                   (0x0C << ST_AHCI_OOBR_CIMAX_SHIFT);
  50
  51         old_val = readl(mmio + ST_AHCI_OOBR);
  52         writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
  53         writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
  54         writel(new_val, mmio + ST_AHCI_OOBR);
  55 }
  56
  57 static int st_ahci_deassert_resets(struct ahci_host_priv *hpriv,
  58                                 struct device *dev)
  59 {
  60         struct st_ahci_drv_data *drv_data = hpriv->plat_data;
  61         int err;
  62
  63         if (drv_data->pwr) {
  64                 err = reset_control_deassert(drv_data->pwr);
  65                 if (err) {
  66                         dev_err(dev, "unable to bring out of pwrdwn\n");
  67                         return err;
  68                 }
  69         }
  70
  71         if (drv_data->sw_rst) {
  72                 err = reset_control_deassert(drv_data->sw_rst);
  73                 if (err) {
  74                         dev_err(dev, "unable to bring out of sw-rst\n");
  75                         return err;
  76                 }
  77         }
  78
  79         if (drv_data->pwr_rst) {
  80                 err = reset_control_deassert(drv_data->pwr_rst);
  81                 if (err) {
  82                         dev_err(dev, "unable to bring out of pwr-rst\n");
  83                         return err;
  84                 }
  85         }
  86
  87         return 0;
  88 }
  89
  90 static void st_ahci_host_stop(struct ata_host *host)
  91 {
  92         struct ahci_host_priv *hpriv = host->private_data;
  93         struct st_ahci_drv_data *drv_data = hpriv->plat_data;
  94         struct device *dev = host->dev;
  95         int err;
  96
  97         if (drv_data->pwr) {
  98                 err = reset_control_assert(drv_data->pwr);
  99                 if (err)
 100                         dev_err(dev, "unable to pwrdwn\n");
 101         }
 102
 103         ahci_platform_disable_resources(hpriv);
 104 }
 105
 106 static int st_ahci_probe_resets(struct ahci_host_priv *hpriv,
 107                                 struct device *dev)
 108 {
 109         struct st_ahci_drv_data *drv_data = hpriv->plat_data;
 110
 111         drv_data->pwr = devm_reset_control_get(dev, "pwr-dwn");
 112         if (IS_ERR(drv_data->pwr)) {
 113                 dev_info(dev, "power reset control not defined\n");
 114                 drv_data->pwr = NULL;
 115         }
 116
 117         drv_data->sw_rst = devm_reset_control_get(dev, "sw-rst");
 118         if (IS_ERR(drv_data->sw_rst)) {
 119                 dev_info(dev, "soft reset control not defined\n");
 120                 drv_data->sw_rst = NULL;
 121         }
 122
 123         drv_data->pwr_rst = devm_reset_control_get(dev, "pwr-rst");
 124         if (IS_ERR(drv_data->pwr_rst)) {
 125                 dev_dbg(dev, "power soft reset control not defined\n");
 126                 drv_data->pwr_rst = NULL;
 127         }
 128
 129         return st_ahci_deassert_resets(hpriv, dev);
 130 }
 131
 132 static struct ata_port_operations st_ahci_port_ops = {
 133         .inherits       = &ahci_platform_ops,
 134         .host_stop      = st_ahci_host_stop,
 135 };
 136
 137 static const struct ata_port_info st_ahci_port_info = {
 138         .flags          = AHCI_FLAG_COMMON,
 139         .pio_mask       = ATA_PIO4,
 140         .udma_mask      = ATA_UDMA6,
 141         .port_ops       = &st_ahci_port_ops,
 142 };
 143
 144 static struct scsi_host_template ahci_platform_sht = {
 145         AHCI_SHT(DRV_NAME),
 146 };
 147
 148 static int st_ahci_probe(struct platform_device *pdev)
 149 {
 150         struct device *dev = &pdev->dev;
 151         struct st_ahci_drv_data *drv_data;
 152         struct ahci_host_priv *hpriv;
 153         int err;
 154
 155         drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
 156         if (!drv_data)
 157                 return -ENOMEM;
 158
 159         hpriv = ahci_platform_get_resources(pdev);
 160         if (IS_ERR(hpriv))
 161                 return PTR_ERR(hpriv);
 162         hpriv->plat_data = drv_data;
 163
 164         err = st_ahci_probe_resets(hpriv, &pdev->dev);
 165         if (err)
 166                 return err;
 167
 168         err = ahci_platform_enable_resources(hpriv);
 169         if (err)
 170                 return err;
 171
 172         st_ahci_configure_oob(hpriv->mmio);
 173
 174         of_property_read_u32(dev->of_node,
 175                              "ports-implemented", &hpriv->force_port_map);
 176
 177         err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info,
 178                                       &ahci_platform_sht);
 179         if (err) {
 180                 ahci_platform_disable_resources(hpriv);
 181                 return err;
 182         }
 183
 184         return 0;
 185 }
 186
 187 #ifdef CONFIG_PM_SLEEP
 188 static int st_ahci_suspend(struct device *dev)
 189 {
 190         struct ata_host *host = dev_get_drvdata(dev);
 191         struct ahci_host_priv *hpriv = host->private_data;
 192         struct st_ahci_drv_data *drv_data = hpriv->plat_data;
 193         int err;
 194
 195         err = ahci_platform_suspend_host(dev);
 196         if (err)
 197                 return err;
 198
 199         if (drv_data->pwr) {
 200                 err = reset_control_assert(drv_data->pwr);
 201                 if (err) {
 202                         dev_err(dev, "unable to pwrdwn");
 203                         return err;
 204                 }
 205         }
 206
 207         ahci_platform_disable_resources(hpriv);
 208
 209         return 0;
 210 }
 211
 212 static int st_ahci_resume(struct device *dev)
 213 {
 214         struct ata_host *host = dev_get_drvdata(dev);
 215         struct ahci_host_priv *hpriv = host->private_data;
 216         int err;
 217
 218         err = ahci_platform_enable_resources(hpriv);
 219         if (err)
 220                 return err;
 221
 222         err = st_ahci_deassert_resets(hpriv, dev);
 223         if (err) {
 224                 ahci_platform_disable_resources(hpriv);
 225                 return err;
 226         }
 227
 228         st_ahci_configure_oob(hpriv->mmio);
 229
 230         return ahci_platform_resume_host(dev);
 231 }
 232 #endif
 233
 234 static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
 235
 236 static const struct of_device_id st_ahci_match[] = {
 237         { .compatible = "st,ahci", },
 238         {},
 239 };
 240 MODULE_DEVICE_TABLE(of, st_ahci_match);
 241
 242 static struct platform_driver st_ahci_driver = {
 243         .driver = {
 244                 .name = DRV_NAME,
 245                 .pm = &st_ahci_pm_ops,
 246                 .of_match_table = of_match_ptr(st_ahci_match),
 247         },
 248         .probe = st_ahci_probe,
 249         .remove = ata_platform_remove_one,
 250 };
 251 module_platform_driver(st_ahci_driver);
 252
 253 MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
 254 MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
 255 MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
 256 MODULE_LICENSE("GPL v2");