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/*
* Copyright (C) 2012 STMicroelectronics Limited
*
* Authors: Francesco Virlinzi <francesco.virlinzi@st.com>
* Alexandre Torgue <alexandre.torgue@st.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/init.h>
#include <linux/module.h>
#include <linux/export.h>
#include <linux/platform_device.h>
#include <linux/clk.h>
#include <linux/of.h>
#include <linux/ahci_platform.h>
#include <linux/libata.h>
#include <linux/reset.h>
#include <linux/io.h>
#include <linux/dma-mapping.h>
#include "ahci.h"
#define DRV_NAME "st_ahci"
#define ST_AHCI_OOBR 0xbc
#define ST_AHCI_OOBR_WE BIT(31)
#define ST_AHCI_OOBR_CWMIN_SHIFT 24
#define ST_AHCI_OOBR_CWMAX_SHIFT 16
#define ST_AHCI_OOBR_CIMIN_SHIFT 8
#define ST_AHCI_OOBR_CIMAX_SHIFT 0
struct st_ahci_drv_data {
struct platform_device *ahci;
struct reset_control *pwr;
struct reset_control *sw_rst;
struct reset_control *pwr_rst;
};
static void st_ahci_configure_oob(void __iomem *mmio)
{
unsigned long old_val, new_val;
new_val = (0x02 << ST_AHCI_OOBR_CWMIN_SHIFT) |
(0x04 << ST_AHCI_OOBR_CWMAX_SHIFT) |
(0x08 << ST_AHCI_OOBR_CIMIN_SHIFT) |
(0x0C << ST_AHCI_OOBR_CIMAX_SHIFT);
old_val = readl(mmio + ST_AHCI_OOBR);
writel(old_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
writel(new_val | ST_AHCI_OOBR_WE, mmio + ST_AHCI_OOBR);
writel(new_val, mmio + ST_AHCI_OOBR);
}
static int st_ahci_deassert_resets(struct ahci_host_priv *hpriv,
struct device *dev)
{
struct st_ahci_drv_data *drv_data = hpriv->plat_data;
int err;
if (drv_data->pwr) {
err = reset_control_deassert(drv_data->pwr);
if (err) {
dev_err(dev, "unable to bring out of pwrdwn\n");
return err;
}
}
if (drv_data->sw_rst) {
err = reset_control_deassert(drv_data->sw_rst);
if (err) {
dev_err(dev, "unable to bring out of sw-rst\n");
return err;
}
}
if (drv_data->pwr_rst) {
err = reset_control_deassert(drv_data->pwr_rst);
if (err) {
dev_err(dev, "unable to bring out of pwr-rst\n");
return err;
}
}
return 0;
}
static void st_ahci_host_stop(struct ata_host *host)
{
struct ahci_host_priv *hpriv = host->private_data;
struct st_ahci_drv_data *drv_data = hpriv->plat_data;
struct device *dev = host->dev;
int err;
if (drv_data->pwr) {
err = reset_control_assert(drv_data->pwr);
if (err)
dev_err(dev, "unable to pwrdwn\n");
}
ahci_platform_disable_resources(hpriv);
}
static int st_ahci_probe_resets(struct ahci_host_priv *hpriv,
struct device *dev)
{
struct st_ahci_drv_data *drv_data = hpriv->plat_data;
drv_data->pwr = devm_reset_control_get(dev, "pwr-dwn");
if (IS_ERR(drv_data->pwr)) {
dev_info(dev, "power reset control not defined\n");
drv_data->pwr = NULL;
}
drv_data->sw_rst = devm_reset_control_get(dev, "sw-rst");
if (IS_ERR(drv_data->sw_rst)) {
dev_info(dev, "soft reset control not defined\n");
drv_data->sw_rst = NULL;
}
drv_data->pwr_rst = devm_reset_control_get(dev, "pwr-rst");
if (IS_ERR(drv_data->pwr_rst)) {
dev_dbg(dev, "power soft reset control not defined\n");
drv_data->pwr_rst = NULL;
}
return st_ahci_deassert_resets(hpriv, dev);
}
static struct ata_port_operations st_ahci_port_ops = {
.inherits = &ahci_platform_ops,
.host_stop = st_ahci_host_stop,
};
static const struct ata_port_info st_ahci_port_info = {
.flags = AHCI_FLAG_COMMON,
.pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &st_ahci_port_ops,
};
static struct scsi_host_template ahci_platform_sht = {
AHCI_SHT(DRV_NAME),
};
static int st_ahci_probe(struct platform_device *pdev)
{
struct st_ahci_drv_data *drv_data;
struct ahci_host_priv *hpriv;
int err;
drv_data = devm_kzalloc(&pdev->dev, sizeof(*drv_data), GFP_KERNEL);
if (!drv_data)
return -ENOMEM;
hpriv = ahci_platform_get_resources(pdev);
if (IS_ERR(hpriv))
return PTR_ERR(hpriv);
hpriv->plat_data = drv_data;
err = st_ahci_probe_resets(hpriv, &pdev->dev);
if (err)
return err;
err = ahci_platform_enable_resources(hpriv);
if (err)
return err;
st_ahci_configure_oob(hpriv->mmio);
err = ahci_platform_init_host(pdev, hpriv, &st_ahci_port_info,
&ahci_platform_sht);
if (err) {
ahci_platform_disable_resources(hpriv);
return err;
}
return 0;
}
#ifdef CONFIG_PM_SLEEP
static int st_ahci_suspend(struct device *dev)
{
struct ata_host *host = dev_get_drvdata(dev);
struct ahci_host_priv *hpriv = host->private_data;
struct st_ahci_drv_data *drv_data = hpriv->plat_data;
int err;
err = ahci_platform_suspend_host(dev);
if (err)
return err;
if (drv_data->pwr) {
err = reset_control_assert(drv_data->pwr);
if (err) {
dev_err(dev, "unable to pwrdwn");
return err;
}
}
ahci_platform_disable_resources(hpriv);
return 0;
}
static int st_ahci_resume(struct device *dev)
{
struct ata_host *host = dev_get_drvdata(dev);
struct ahci_host_priv *hpriv = host->private_data;
int err;
err = ahci_platform_enable_resources(hpriv);
if (err)
return err;
err = st_ahci_deassert_resets(hpriv, dev);
if (err) {
ahci_platform_disable_resources(hpriv);
return err;
}
st_ahci_configure_oob(hpriv->mmio);
return ahci_platform_resume_host(dev);
}
#endif
static SIMPLE_DEV_PM_OPS(st_ahci_pm_ops, st_ahci_suspend, st_ahci_resume);
static const struct of_device_id st_ahci_match[] = {
{ .compatible = "st,ahci", },
{},
};
MODULE_DEVICE_TABLE(of, st_ahci_match);
static struct platform_driver st_ahci_driver = {
.driver = {
.name = DRV_NAME,
.pm = &st_ahci_pm_ops,
.of_match_table = of_match_ptr(st_ahci_match),
},
.probe = st_ahci_probe,
.remove = ata_platform_remove_one,
};
module_platform_driver(st_ahci_driver);
MODULE_AUTHOR("Alexandre Torgue <alexandre.torgue@st.com>");
MODULE_AUTHOR("Francesco Virlinzi <francesco.virlinzi@st.com>");
MODULE_DESCRIPTION("STMicroelectronics SATA AHCI Driver");
MODULE_LICENSE("GPL v2");
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