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 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
  33struct 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
  41static 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
  56static 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
  90static 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
 106static 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
 131static struct ata_port_operations st_ahci_port_ops = {
 132        .inherits       = &ahci_platform_ops,
 133        .host_stop      = st_ahci_host_stop,
 134};
 135
 136static 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
 143static 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
 179static 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
 202static 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
 222static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
 223
 224static const struct of_device_id st_ahci_match[] = {
 225        { .compatible = "st,ahci", },
 226        {},
 227};
 228MODULE_DEVICE_TABLE(of, st_ahci_match);
 229
 230static struct platform_driver st_ahci_driver = {
 231        .driver = {
 232                .name = "st_ahci",
 233                .pm = &st_ahci_pm_ops,
 234                .of_match_table = of_match_ptr(st_ahci_match),
 235        },
 236        .probe = st_ahci_probe,
 237        .remove = ata_platform_remove_one,
 238};
 239module_platform_driver(st_ahci_driver);
 240
 241MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
 242MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
 243MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
 244MODULE_LICENSE("GPL v2");
 245
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