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/*
* ST spear1340-miphy driver
*
* Copyright (C) 2014 ST Microelectronics
* Pratyush Anand <pratyush.anand@st.com>
* Mohit Kumar <mohit.kumar@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/bitops.h>
#include <linux/delay.h>
#include <linux/dma-mapping.h>
#include <linux/kernel.h>
#include <linux/mfd/syscon.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/phy/phy.h>
#include <linux/regmap.h>
/* SPEAr1340 Registers */
/* Power Management Registers */
#define SPEAR1340_PCM_CFG 0x100
#define SPEAR1340_PCM_CFG_SATA_POWER_EN BIT(11)
#define SPEAR1340_PCM_WKUP_CFG 0x104
#define SPEAR1340_SWITCH_CTR 0x108
#define SPEAR1340_PERIP1_SW_RST 0x318
#define SPEAR1340_PERIP1_SW_RSATA BIT(12)
#define SPEAR1340_PERIP2_SW_RST 0x31C
#define SPEAR1340_PERIP3_SW_RST 0x320
/* PCIE - SATA configuration registers */
#define SPEAR1340_PCIE_SATA_CFG 0x424
/* PCIE CFG MASks */
#define SPEAR1340_PCIE_CFG_DEVICE_PRESENT BIT(11)
#define SPEAR1340_PCIE_CFG_POWERUP_RESET BIT(10)
#define SPEAR1340_PCIE_CFG_CORE_CLK_EN BIT(9)
#define SPEAR1340_PCIE_CFG_AUX_CLK_EN BIT(8)
#define SPEAR1340_SATA_CFG_TX_CLK_EN BIT(4)
#define SPEAR1340_SATA_CFG_RX_CLK_EN BIT(3)
#define SPEAR1340_SATA_CFG_POWERUP_RESET BIT(2)
#define SPEAR1340_SATA_CFG_PM_CLK_EN BIT(1)
#define SPEAR1340_PCIE_SATA_SEL_PCIE (0)
#define SPEAR1340_PCIE_SATA_SEL_SATA (1)
#define SPEAR1340_PCIE_SATA_CFG_MASK 0xF1F
#define SPEAR1340_PCIE_CFG_VAL (SPEAR1340_PCIE_SATA_SEL_PCIE | \
SPEAR1340_PCIE_CFG_AUX_CLK_EN | \
SPEAR1340_PCIE_CFG_CORE_CLK_EN | \
SPEAR1340_PCIE_CFG_POWERUP_RESET | \
SPEAR1340_PCIE_CFG_DEVICE_PRESENT)
#define SPEAR1340_SATA_CFG_VAL (SPEAR1340_PCIE_SATA_SEL_SATA | \
SPEAR1340_SATA_CFG_PM_CLK_EN | \
SPEAR1340_SATA_CFG_POWERUP_RESET | \
SPEAR1340_SATA_CFG_RX_CLK_EN | \
SPEAR1340_SATA_CFG_TX_CLK_EN)
#define SPEAR1340_PCIE_MIPHY_CFG 0x428
#define SPEAR1340_MIPHY_OSC_BYPASS_EXT BIT(31)
#define SPEAR1340_MIPHY_CLK_REF_DIV2 BIT(27)
#define SPEAR1340_MIPHY_CLK_REF_DIV4 (2 << 27)
#define SPEAR1340_MIPHY_CLK_REF_DIV8 (3 << 27)
#define SPEAR1340_MIPHY_PLL_RATIO_TOP(x) (x << 0)
#define SPEAR1340_PCIE_MIPHY_CFG_MASK 0xF80000FF
#define SPEAR1340_PCIE_SATA_MIPHY_CFG_SATA \
(SPEAR1340_MIPHY_OSC_BYPASS_EXT | \
SPEAR1340_MIPHY_CLK_REF_DIV2 | \
SPEAR1340_MIPHY_PLL_RATIO_TOP(60))
#define SPEAR1340_PCIE_SATA_MIPHY_CFG_SATA_25M_CRYSTAL_CLK \
(SPEAR1340_MIPHY_PLL_RATIO_TOP(120))
#define SPEAR1340_PCIE_SATA_MIPHY_CFG_PCIE \
(SPEAR1340_MIPHY_OSC_BYPASS_EXT | \
SPEAR1340_MIPHY_PLL_RATIO_TOP(25))
enum spear1340_miphy_mode {
SATA,
PCIE,
};
struct spear1340_miphy_priv {
/* phy mode: 0 for SATA 1 for PCIe */
enum spear1340_miphy_mode mode;
/* regmap for any soc specific misc registers */
struct regmap *misc;
/* phy struct pointer */
struct phy *phy;
};
static int spear1340_miphy_sata_init(struct spear1340_miphy_priv *priv)
{
regmap_update_bits(priv->misc, SPEAR1340_PCIE_SATA_CFG,
SPEAR1340_PCIE_SATA_CFG_MASK,
SPEAR1340_SATA_CFG_VAL);
regmap_update_bits(priv->misc, SPEAR1340_PCIE_MIPHY_CFG,
SPEAR1340_PCIE_MIPHY_CFG_MASK,
SPEAR1340_PCIE_SATA_MIPHY_CFG_SATA_25M_CRYSTAL_CLK);
/* Switch on sata power domain */
regmap_update_bits(priv->misc, SPEAR1340_PCM_CFG,
SPEAR1340_PCM_CFG_SATA_POWER_EN,
SPEAR1340_PCM_CFG_SATA_POWER_EN);
/* Wait for SATA power domain on */
msleep(20);
/* Disable PCIE SATA Controller reset */
regmap_update_bits(priv->misc, SPEAR1340_PERIP1_SW_RST,
SPEAR1340_PERIP1_SW_RSATA, 0);
/* Wait for SATA reset de-assert completion */
msleep(20);
return 0;
}
static int spear1340_miphy_sata_exit(struct spear1340_miphy_priv *priv)
{
regmap_update_bits(priv->misc, SPEAR1340_PCIE_SATA_CFG,
SPEAR1340_PCIE_SATA_CFG_MASK, 0);
regmap_update_bits(priv->misc, SPEAR1340_PCIE_MIPHY_CFG,
SPEAR1340_PCIE_MIPHY_CFG_MASK, 0);
/* Enable PCIE SATA Controller reset */
regmap_update_bits(priv->misc, SPEAR1340_PERIP1_SW_RST,
SPEAR1340_PERIP1_SW_RSATA,
SPEAR1340_PERIP1_SW_RSATA);
/* Wait for SATA power domain off */
msleep(20);
/* Switch off sata power domain */
regmap_update_bits(priv->misc, SPEAR1340_PCM_CFG,
SPEAR1340_PCM_CFG_SATA_POWER_EN, 0);
/* Wait for SATA reset assert completion */
msleep(20);
return 0;
}
static int spear1340_miphy_pcie_init(struct spear1340_miphy_priv *priv)
{
regmap_update_bits(priv->misc, SPEAR1340_PCIE_MIPHY_CFG,
SPEAR1340_PCIE_MIPHY_CFG_MASK,
SPEAR1340_PCIE_SATA_MIPHY_CFG_PCIE);
regmap_update_bits(priv->misc, SPEAR1340_PCIE_SATA_CFG,
SPEAR1340_PCIE_SATA_CFG_MASK,
SPEAR1340_PCIE_CFG_VAL);
return 0;
}
static int spear1340_miphy_pcie_exit(struct spear1340_miphy_priv *priv)
{
regmap_update_bits(priv->misc, SPEAR1340_PCIE_MIPHY_CFG,
SPEAR1340_PCIE_MIPHY_CFG_MASK, 0);
regmap_update_bits(priv->misc, SPEAR1340_PCIE_SATA_CFG,
SPEAR1340_PCIE_SATA_CFG_MASK, 0);
return 0;
}
static int spear1340_miphy_init(struct phy *phy)
{
struct spear1340_miphy_priv *priv = phy_get_drvdata(phy);
int ret = 0;
if (priv->mode == SATA)
ret = spear1340_miphy_sata_init(priv);
else if (priv->mode == PCIE)
ret = spear1340_miphy_pcie_init(priv);
return ret;
}
static int spear1340_miphy_exit(struct phy *phy)
{
struct spear1340_miphy_priv *priv = phy_get_drvdata(phy);
int ret = 0;
if (priv->mode == SATA)
ret = spear1340_miphy_sata_exit(priv);
else if (priv->mode == PCIE)
ret = spear1340_miphy_pcie_exit(priv);
return ret;
}
static const struct of_device_id spear1340_miphy_of_match[] = {
{ .compatible = "st,spear1340-miphy" },
{ },
};
MODULE_DEVICE_TABLE(of, spear1340_miphy_of_match);
static struct phy_ops spear1340_miphy_ops = {
.init = spear1340_miphy_init,
.exit = spear1340_miphy_exit,
.owner = THIS_MODULE,
};
#ifdef CONFIG_PM_SLEEP
static int spear1340_miphy_suspend(struct device *dev)
{
struct spear1340_miphy_priv *priv = dev_get_drvdata(dev);
int ret = 0;
if (priv->mode == SATA)
ret = spear1340_miphy_sata_exit(priv);
return ret;
}
static int spear1340_miphy_resume(struct device *dev)
{
struct spear1340_miphy_priv *priv = dev_get_drvdata(dev);
int ret = 0;
if (priv->mode == SATA)
ret = spear1340_miphy_sata_init(priv);
return ret;
}
#endif
static SIMPLE_DEV_PM_OPS(spear1340_miphy_pm_ops, spear1340_miphy_suspend,
spear1340_miphy_resume);
static struct phy *spear1340_miphy_xlate(struct device *dev,
struct of_phandle_args *args)
{
struct spear1340_miphy_priv *priv = dev_get_drvdata(dev);
if (args->args_count < 1) {
dev_err(dev, "DT did not pass correct no of args\n");
return ERR_PTR(-ENODEV);
}
priv->mode = args->args[0];
if (priv->mode != SATA && priv->mode != PCIE) {
dev_err(dev, "DT did not pass correct phy mode\n");
return ERR_PTR(-ENODEV);
}
return priv->phy;
}
static int spear1340_miphy_probe(struct platform_device *pdev)
{
struct device *dev = &pdev->dev;
struct spear1340_miphy_priv *priv;
struct phy_provider *phy_provider;
priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
priv->misc =
syscon_regmap_lookup_by_phandle(dev->of_node, "misc");
if (IS_ERR(priv->misc)) {
dev_err(dev, "failed to find misc regmap\n");
return PTR_ERR(priv->misc);
}
priv->phy = devm_phy_create(dev, NULL, &spear1340_miphy_ops);
if (IS_ERR(priv->phy)) {
dev_err(dev, "failed to create SATA PCIe PHY\n");
return PTR_ERR(priv->phy);
}
dev_set_drvdata(dev, priv);
phy_set_drvdata(priv->phy, priv);
phy_provider =
devm_of_phy_provider_register(dev, spear1340_miphy_xlate);
if (IS_ERR(phy_provider)) {
dev_err(dev, "failed to register phy provider\n");
return PTR_ERR(phy_provider);
}
return 0;
}
static struct platform_driver spear1340_miphy_driver = {
.probe = spear1340_miphy_probe,
.driver = {
.name = "spear1340-miphy",
.pm = &spear1340_miphy_pm_ops,
.of_match_table = of_match_ptr(spear1340_miphy_of_match),
},
};
module_platform_driver(spear1340_miphy_driver);
MODULE_DESCRIPTION("ST SPEAR1340-MIPHY driver");
MODULE_AUTHOR("Pratyush Anand <pratyush.anand@st.com>");
MODULE_LICENSE("GPL v2");
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