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         struct ahci_host_priv *hpriv;
  41 };
  42
  43 static void st_ahci_configure_oob(void __iomem *mmio)
  44 {
  45         unsigned long old_val, new_val;
  46
  47         new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) |
  48                   (0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) |
  49                   (0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) |
  50                   (0x0C << ST_AHCI_OOBR_CIMAX_SHIFT);
  51
  52         old_val = readl(mmio + ST_AHCI_OOBR);
  53         writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
  54         writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
  55         writel(new_val, mmio + ST_AHCI_OOBR);
  56 }
  57
  58 static int st_ahci_deassert_resets(struct device *dev)
  59 {
  60         struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
  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 device *dev = host->dev;
  94         struct st_ahci_drv_data *drv_data = dev_get_drvdata(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 platform_device *pdev)
 107 {
 108         struct st_ahci_drv_data *drv_data = platform_get_drvdata(pdev);
 109
 110         drv_data->pwr = devm_reset_control_get(&pdev->dev, "pwr-dwn");
 111         if (IS_ERR(drv_data->pwr)) {
 112                 dev_info(&pdev->dev, "power reset control not defined\n");
 113                 drv_data->pwr = NULL;
 114         }
 115
 116         drv_data->sw_rst = devm_reset_control_get(&pdev->dev, "sw-rst");
 117         if (IS_ERR(drv_data->sw_rst)) {
 118                 dev_info(&pdev->dev, "soft reset control not defined\n");
 119                 drv_data->sw_rst = NULL;
 120         }
 121
 122         drv_data->pwr_rst = devm_reset_control_get(&pdev->dev, "pwr-rst");
 123         if (IS_ERR(drv_data->pwr_rst)) {
 124                 dev_dbg(&pdev->dev, "power soft reset control not defined\n");
 125                 drv_data->pwr_rst = NULL;
 126         }
 127
 128         return st_ahci_deassert_resets(&pdev->dev);
 129 }
 130
 131 static struct ata_port_operations st_ahci_port_ops = {
 132         .inherits       = &ahci_platform_ops,
 133         .host_stop      = st_ahci_host_stop,
 134 };
 135
 136 static const struct ata_port_info st_ahci_port_info = {
 137         .flags          = AHCI_FLAG_COMMON,
 138         .pio_mask       = ATA_PIO4,
 139         .udma_mask      = ATA_UDMA6,
 140         .port_ops       = &st_ahci_port_ops,
 141 };
 142
 143 static struct scsi_host_template ahci_platform_sht = {
 144         AHCI_SHT(DRV_NAME),
 145 };
 146
 147 static int st_ahci_probe(struct platform_device *pdev)
 148 {
 149         struct st_ahci_drv_data *drv_data;
 150         struct ahci_host_priv *hpriv;
 151         int err;
 152
 153         drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
 154         if (!drv_data)
 155                 return -ENOMEM;
 156
 157         platform_set_drvdata(pdev, drv_data);
 158
 159         hpriv = ahci_platform_get_resources(pdev);
 160         if (IS_ERR(hpriv))
 161                 return PTR_ERR(hpriv);
 162
 163         drv_data->hpriv = hpriv;
 164
 165         err = st_ahci_probe_resets(pdev);
 166         if (err)
 167                 return err;
 168
 169         err = ahci_platform_enable_resources(hpriv);
 170         if (err)
 171                 return err;
 172
 173         st_ahci_configure_oob(drv_data->hpriv->mmio);
 174
 175         err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info,
 176                                       &ahci_platform_sht);
 177         if (err) {
 178                 ahci_platform_disable_resources(hpriv);
 179                 return err;
 180         }
 181
 182         return 0;
 183 }
 184
 185 #ifdef CONFIG_PM_SLEEP
 186 static int st_ahci_suspend(struct device *dev)
 187 {
 188         struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
 189         struct ahci_host_priv *hpriv = drv_data->hpriv;
 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 st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
 212         struct ahci_host_priv *hpriv = drv_data->hpriv;
 213         int err;
 214
 215         err = ahci_platform_enable_resources(hpriv);
 216         if (err)
 217                 return err;
 218
 219         err = st_ahci_deassert_resets(dev);
 220         if (err) {
 221                 ahci_platform_disable_resources(hpriv);
 222                 return err;
 223         }
 224
 225         st_ahci_configure_oob(drv_data->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");