linux/drivers/ata/ahci_st.c
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   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
  35struct 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
  42static 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
  57static 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
  90static 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
 106static 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
 132static struct ata_port_operations st_ahci_port_ops = {
 133        .inherits       = &ahci_platform_ops,
 134        .host_stop      = st_ahci_host_stop,
 135};
 136
 137static 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
 144static struct scsi_host_template ahci_platform_sht = {
 145        AHCI_SHT(DRV_NAME),
 146};
 147
 148static 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
 188static 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
 212static 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
 234static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
 235
 236static const struct of_device_id st_ahci_match[] = {
 237        { .compatible = "st,ahci", },
 238        {},
 239};
 240MODULE_DEVICE_TABLE(of, st_ahci_match);
 241
 242static 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};
 251module_platform_driver(st_ahci_driver);
 252
 253MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
 254MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
 255MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
 256MODULE_LICENSE("GPL v2");
 257
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