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/*
* MediaTek AHCI SATA driver
*
* Copyright (c) 2017 MediaTek Inc.
* Author: Ryder Lee <ryder.lee@mediatek.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.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/ahci_platform.h>
#include <linux/kernel.h>
#include <linux/libata.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/pm.h>
#include <linux/regmap.h>
#include <linux/reset.h>
#include "ahci.h"
#define DRV_NAME "ahci-mtk"
#define SYS_CFG 0x14
#define SYS_CFG_SATA_MSK GENMASK(31, 30)
#define SYS_CFG_SATA_EN BIT(31)
struct mtk_ahci_plat {
struct regmap *mode;
struct reset_control *axi_rst;
struct reset_control *sw_rst;
struct reset_control *reg_rst;
};
static const struct ata_port_info ahci_port_info = {
.flags = AHCI_FLAG_COMMON,
.pio_mask = ATA_PIO4,
.udma_mask = ATA_UDMA6,
.port_ops = &ahci_platform_ops,
};
static struct scsi_host_template ahci_platform_sht = {
AHCI_SHT(DRV_NAME),
};
static int mtk_ahci_platform_resets(struct ahci_host_priv *hpriv,
struct device *dev)
{
struct mtk_ahci_plat *plat = hpriv->plat_data;
int err;
/* reset AXI bus and PHY part */
plat->axi_rst = devm_reset_control_get_optional_exclusive(dev, "axi");
if (PTR_ERR(plat->axi_rst) == -EPROBE_DEFER)
return PTR_ERR(plat->axi_rst);
plat->sw_rst = devm_reset_control_get_optional_exclusive(dev, "sw");
if (PTR_ERR(plat->sw_rst) == -EPROBE_DEFER)
return PTR_ERR(plat->sw_rst);
plat->reg_rst = devm_reset_control_get_optional_exclusive(dev, "reg");
if (PTR_ERR(plat->reg_rst) == -EPROBE_DEFER)
return PTR_ERR(plat->reg_rst);
err = reset_control_assert(plat->axi_rst);
if (err) {
dev_err(dev, "failed to assert AXI bus\n");
return err;
}
err = reset_control_assert(plat->sw_rst);
if (err) {
dev_err(dev, "failed to assert PHY digital part\n");
return err;
}
err = reset_control_assert(plat->reg_rst);
if (err) {
dev_err(dev, "failed to assert PHY register part\n");
return err;
}
err = reset_control_deassert(plat->reg_rst);
if (err) {
dev_err(dev, "failed to deassert PHY register part\n");
return err;
}
err = reset_control_deassert(plat->sw_rst);
if (err) {
dev_err(dev, "failed to deassert PHY digital part\n");
return err;
}
err = reset_control_deassert(plat->axi_rst);
if (err) {
dev_err(dev, "failed to deassert AXI bus\n");
return err;
}
return 0;
}
static int mtk_ahci_parse_property(struct ahci_host_priv *hpriv,
struct device *dev)
{
struct mtk_ahci_plat *plat = hpriv->plat_data;
struct device_node *np = dev->of_node;
/* enable SATA function if needed */
if (of_find_property(np, "mediatek,phy-mode", NULL)) {
plat->mode = syscon_regmap_lookup_by_phandle(
np, "mediatek,phy-mode");
if (IS_ERR(plat->mode)) {
dev_err(dev, "missing phy-mode phandle\n");
return PTR_ERR(plat->mode);
}
regmap_update_bits(plat->mode, SYS_CFG, SYS_CFG_SATA_MSK,
SYS_CFG_SATA_EN);
}
of_property_read_u32(np, "ports-implemented", &hpriv->force_port_map);
return 0;
}
static int mtk_ahci_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct mtk_ahci_plat *plat;
struct ahci_host_priv *hpriv;
int err;
plat = devm_kzalloc(dev, sizeof(*plat), GFP_KERNEL);
if (!plat)
return -ENOMEM;
hpriv = ahci_platform_get_resources(pdev);
if (IS_ERR(hpriv))
return PTR_ERR(hpriv);
hpriv->plat_data = plat;
err = mtk_ahci_parse_property(hpriv, dev);
if (err)
return err;
err = mtk_ahci_platform_resets(hpriv, dev);
if (err)
return err;
err = ahci_platform_enable_resources(hpriv);
if (err)
return err;
err = ahci_platform_init_host(pdev, hpriv, &ahci_port_info,
&ahci_platform_sht);
if (err)
goto disable_resources;
return 0;
disable_resources:
ahci_platform_disable_resources(hpriv);
return err;
}
static SIMPLE_DEV_PM_OPS(ahci_pm_ops, ahci_platform_suspend,
ahci_platform_resume);
static const struct of_device_id ahci_of_match[] = {
{ .compatible = "mediatek,mtk-ahci", },
{},
};
MODULE_DEVICE_TABLE(of, ahci_of_match);
static struct platform_driver mtk_ahci_driver = {
.probe = mtk_ahci_probe,
.remove = ata_platform_remove_one,
.driver = {
.name = DRV_NAME,
.of_match_table = ahci_of_match,
.pm = &ahci_pm_ops,
},
};
module_platform_driver(mtk_ahci_driver);
MODULE_DESCRIPTION("MediaTek SATA AHCI Driver");
MODULE_LICENSE("GPL v2");
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