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 ST_AHCI_OOBR                    0xbc
  27 #define ST_AHCI_OOBR_WE                 BIT(31)
  28 #define ST_AHCI_OOBR_CWMIN_SHIFT        24
  29 #define ST_AHCI_OOBR_CWMAX_SHIFT        16
  30 #define ST_AHCI_OOBR_CIMIN_SHIFT        8
  31 #define ST_AHCI_OOBR_CIMAX_SHIFT        0
  32
  33 struct st_ahci_drv_data {
  34         struct platform_device *ahci;
  35         struct reset_control *pwr;
  36         struct reset_control *sw_rst;
  37         struct reset_control *pwr_rst;
  38         struct ahci_host_priv *hpriv;
  39 };
  40
  41 static void st_ahci_configure_oob(void __iomem *mmio)
  42 {
  43         unsigned long old_val, new_val;
  44
  45         new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) |
  46                   (0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) |
  47                   (0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) |
  48                   (0x0C << ST_AHCI_OOBR_CIMAX_SHIFT);
  49
  50         old_val = readl(mmio + ST_AHCI_OOBR);
  51         writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
  52         writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
  53         writel(new_val, mmio + ST_AHCI_OOBR);
  54 }
  55
  56 static int st_ahci_deassert_resets(struct device *dev)
  57 {
  58         struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
  59         int err;
  60
  61         if (drv_data->pwr) {
  62                 err = reset_control_deassert(drv_data->pwr);
  63                 if (err) {
  64                         dev_err(dev, "unable to bring out of pwrdwn\n");
  65                         return err;
  66                 }
  67         }
  68
  69         st_ahci_configure_oob(drv_data->hpriv->mmio);
  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 int st_ahci_probe(struct platform_device *pdev)
 144 {
 145         struct st_ahci_drv_data *drv_data;
 146         struct ahci_host_priv *hpriv;
 147         int err;
 148
 149         drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
 150         if (!drv_data)
 151                 return -ENOMEM;
 152
 153         platform_set_drvdata(pdev, drv_data);
 154
 155         hpriv = ahci_platform_get_resources(pdev);
 156         if (IS_ERR(hpriv))
 157                 return PTR_ERR(hpriv);
 158
 159         drv_data->hpriv = hpriv;
 160
 161         err = st_ahci_probe_resets(pdev);
 162         if (err)
 163                 return err;
 164
 165         err = ahci_platform_enable_resources(hpriv);
 166         if (err)
 167                 return err;
 168
 169         err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info);
 170         if (err) {
 171                 ahci_platform_disable_resources(hpriv);
 172                 return err;
 173         }
 174
 175         return 0;
 176 }
 177
 178 #ifdef CONFIG_PM_SLEEP
 179 static int st_ahci_suspend(struct device *dev)
 180 {
 181         struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
 182         struct ahci_host_priv *hpriv = drv_data->hpriv;
 183         int err;
 184
 185         err = ahci_platform_suspend_host(dev);
 186         if (err)
 187                 return err;
 188
 189         if (drv_data->pwr) {
 190                 err = reset_control_assert(drv_data->pwr);
 191                 if (err) {
 192                         dev_err(dev, "unable to pwrdwn");
 193                         return err;
 194                 }
 195         }
 196
 197         ahci_platform_disable_resources(hpriv);
 198
 199         return 0;
 200 }
 201
 202 static int st_ahci_resume(struct device *dev)
 203 {
 204         struct st_ahci_drv_data *drv_data = dev_get_drvdata(dev);
 205         struct ahci_host_priv *hpriv = drv_data->hpriv;
 206         int err;
 207
 208         err = ahci_platform_enable_resources(hpriv);
 209         if (err)
 210                 return err;
 211
 212         err = st_ahci_deassert_resets(dev);
 213         if (err) {
 214                 ahci_platform_disable_resources(hpriv);
 215                 return err;
 216         }
 217
 218         return ahci_platform_resume_host(dev);
 219 }
 220 #endif
 221
 222 static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
 223
 224 static const struct of_device_id st_ahci_match[] = {
 225         { .compatible = "st,ahci", },
 226         {},
 227 };
 228 MODULE_DEVICE_TABLE(of, st_ahci_match);
 229
 230 static struct platform_driver st_ahci_driver = {
 231         .driver = {
 232                 .name = "st_ahci",
 233                 .owner = THIS_MODULE,
 234                 .pm = &st_ahci_pm_ops,
 235                 .of_match_table = of_match_ptr(st_ahci_match),
 236         },
 237         .probe = st_ahci_probe,
 238         .remove = ata_platform_remove_one,
 239 };
 240 module_platform_driver(st_ahci_driver);
 241
 242 MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
 243 MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
 244 MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
 245 MODULE_LICENSE("GPL v2");