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/*
* Copyright (c) 2014 Linaro Ltd.
* Copyright (c) 2014 Hisilicon Limited.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
#include <linux/delay.h>
#include <linux/io.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/phy/phy.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#define SATA_PHY0_CTLL 0xa0
#define MPLL_MULTIPLIER_SHIFT 1
#define MPLL_MULTIPLIER_MASK 0xfe
#define MPLL_MULTIPLIER_50M 0x3c
#define MPLL_MULTIPLIER_100M 0x1e
#define PHY_RESET BIT(0)
#define REF_SSP_EN BIT(9)
#define SSC_EN BIT(10)
#define REF_USE_PAD BIT(23)
#define SATA_PORT_PHYCTL 0x174
#define SPEED_MODE_MASK 0x6f0000
#define HALF_RATE_SHIFT 16
#define PHY_CONFIG_SHIFT 18
#define GEN2_EN_SHIFT 21
#define SPEED_CTRL BIT(20)
#define SATA_PORT_PHYCTL1 0x148
#define AMPLITUDE_MASK 0x3ffffe
#define AMPLITUDE_GEN3 0x68
#define AMPLITUDE_GEN3_SHIFT 15
#define AMPLITUDE_GEN2 0x56
#define AMPLITUDE_GEN2_SHIFT 8
#define AMPLITUDE_GEN1 0x56
#define AMPLITUDE_GEN1_SHIFT 1
#define SATA_PORT_PHYCTL2 0x14c
#define PREEMPH_MASK 0x3ffff
#define PREEMPH_GEN3 0x20
#define PREEMPH_GEN3_SHIFT 12
#define PREEMPH_GEN2 0x15
#define PREEMPH_GEN2_SHIFT 6
#define PREEMPH_GEN1 0x5
#define PREEMPH_GEN1_SHIFT 0
struct hix5hd2_priv {
void __iomem *base;
struct regmap *peri_ctrl;
};
enum phy_speed_mode {
SPEED_MODE_GEN1 = 0,
SPEED_MODE_GEN2 = 1,
SPEED_MODE_GEN3 = 2,
};
static int hix5hd2_sata_phy_init(struct phy *phy)
{
struct hix5hd2_priv *priv = phy_get_drvdata(phy);
u32 val, data[2];
int ret;
if (priv->peri_ctrl) {
ret = of_property_read_u32_array(phy->dev.of_node,
"hisilicon,power-reg",
&data[0], 2);
if (ret) {
dev_err(&phy->dev, "Fail read hisilicon,power-reg\n");
return ret;
}
regmap_update_bits(priv->peri_ctrl, data[0],
BIT(data[1]), BIT(data[1]));
}
/* reset phy */
val = readl_relaxed(priv->base + SATA_PHY0_CTLL);
val &= ~(MPLL_MULTIPLIER_MASK | REF_USE_PAD);
val |= MPLL_MULTIPLIER_50M << MPLL_MULTIPLIER_SHIFT |
REF_SSP_EN | PHY_RESET;
writel_relaxed(val, priv->base + SATA_PHY0_CTLL);
msleep(20);
val &= ~PHY_RESET;
writel_relaxed(val, priv->base + SATA_PHY0_CTLL);
val = readl_relaxed(priv->base + SATA_PORT_PHYCTL1);
val &= ~AMPLITUDE_MASK;
val |= AMPLITUDE_GEN3 << AMPLITUDE_GEN3_SHIFT |
AMPLITUDE_GEN2 << AMPLITUDE_GEN2_SHIFT |
AMPLITUDE_GEN1 << AMPLITUDE_GEN1_SHIFT;
writel_relaxed(val, priv->base + SATA_PORT_PHYCTL1);
val = readl_relaxed(priv->base + SATA_PORT_PHYCTL2);
val &= ~PREEMPH_MASK;
val |= PREEMPH_GEN3 << PREEMPH_GEN3_SHIFT |
PREEMPH_GEN2 << PREEMPH_GEN2_SHIFT |
PREEMPH_GEN1 << PREEMPH_GEN1_SHIFT;
writel_relaxed(val, priv->base + SATA_PORT_PHYCTL2);
/* ensure PHYCTRL setting takes effect */
val = readl_relaxed(priv->base + SATA_PORT_PHYCTL);
val &= ~SPEED_MODE_MASK;
val |= SPEED_MODE_GEN1 << HALF_RATE_SHIFT |
SPEED_MODE_GEN1 << PHY_CONFIG_SHIFT |
SPEED_MODE_GEN1 << GEN2_EN_SHIFT | SPEED_CTRL;
writel_relaxed(val, priv->base + SATA_PORT_PHYCTL);
msleep(20);
val &= ~SPEED_MODE_MASK;
val |= SPEED_MODE_GEN3 << HALF_RATE_SHIFT |
SPEED_MODE_GEN3 << PHY_CONFIG_SHIFT |
SPEED_MODE_GEN3 << GEN2_EN_SHIFT | SPEED_CTRL;
writel_relaxed(val, priv->base + SATA_PORT_PHYCTL);
val &= ~(SPEED_MODE_MASK | SPEED_CTRL);
val |= SPEED_MODE_GEN2 << HALF_RATE_SHIFT |
SPEED_MODE_GEN2 << PHY_CONFIG_SHIFT |
SPEED_MODE_GEN2 << GEN2_EN_SHIFT;
writel_relaxed(val, priv->base + SATA_PORT_PHYCTL);
return 0;
}
static const struct phy_ops hix5hd2_sata_phy_ops = {
.init = hix5hd2_sata_phy_init,
.owner = THIS_MODULE,
};
static int hix5hd2_sata_phy_probe(struct platform_device *pdev)
{
struct phy_provider *phy_provider;
struct device *dev = &pdev->dev;
struct resource *res;
struct phy *phy;
struct hix5hd2_priv *priv;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
if (!res)
return -EINVAL;
priv->base = devm_ioremap(dev, res->start, resource_size(res));
if (!priv->base)
return -ENOMEM;
priv->peri_ctrl = syscon_regmap_lookup_by_phandle(dev->of_node,
"hisilicon,peripheral-syscon");
if (IS_ERR(priv->peri_ctrl))
priv->peri_ctrl = NULL;
phy = devm_phy_create(dev, NULL, &hix5hd2_sata_phy_ops);
if (IS_ERR(phy)) {
dev_err(dev, "failed to create PHY\n");
return PTR_ERR(phy);
}
phy_set_drvdata(phy, priv);
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
return PTR_ERR_OR_ZERO(phy_provider);
}
static const struct of_device_id hix5hd2_sata_phy_of_match[] = {
{.compatible = "hisilicon,hix5hd2-sata-phy",},
{ },
};
MODULE_DEVICE_TABLE(of, hix5hd2_sata_phy_of_match);
static struct platform_driver hix5hd2_sata_phy_driver = {
.probe = hix5hd2_sata_phy_probe,
.driver = {
.name = "hix5hd2-sata-phy",
.of_match_table = hix5hd2_sata_phy_of_match,
}
};
module_platform_driver(hix5hd2_sata_phy_driver);
MODULE_AUTHOR("Jiancheng Xue <xuejiancheng@huawei.com>");
MODULE_DESCRIPTION("HISILICON HIX5HD2 SATA PHY driver");
MODULE_ALIAS("platform:hix5hd2-sata-phy");
MODULE_LICENSE("GPL v2");
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