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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2015 Linaro, Ltd.
* Rob Herring <robh@kernel.org>
*
* Based on vendor driver:
* Copyright (C) 2013 Marvell Inc.
* Author: Chao Xie <xiechao.mail@gmail.com>
*/
#include <linux/delay.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/io.h>
#include <linux/iopoll.h>
#include <linux/err.h>
#include <linux/clk.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/phy/phy.h>
#define PHY_28NM_HSIC_CTRL 0x08
#define PHY_28NM_HSIC_IMPCAL_CAL 0x18
#define PHY_28NM_HSIC_PLL_CTRL01 0x1c
#define PHY_28NM_HSIC_PLL_CTRL2 0x20
#define PHY_28NM_HSIC_INT 0x28
#define PHY_28NM_HSIC_PLL_SELLPFR_SHIFT 26
#define PHY_28NM_HSIC_PLL_FBDIV_SHIFT 0
#define PHY_28NM_HSIC_PLL_REFDIV_SHIFT 9
#define PHY_28NM_HSIC_S2H_PU_PLL BIT(10)
#define PHY_28NM_HSIC_H2S_PLL_LOCK BIT(15)
#define PHY_28NM_HSIC_S2H_HSIC_EN BIT(7)
#define S2H_DRV_SE0_4RESUME BIT(14)
#define PHY_28NM_HSIC_H2S_IMPCAL_DONE BIT(27)
#define PHY_28NM_HSIC_CONNECT_INT BIT(1)
#define PHY_28NM_HSIC_HS_READY_INT BIT(2)
struct mv_hsic_phy {
struct phy *phy;
struct platform_device *pdev;
void __iomem *base;
struct clk *clk;
};
static int wait_for_reg(void __iomem *reg, u32 mask, u32 ms)
{
u32 val;
return readl_poll_timeout(reg, val, ((val & mask) == mask),
1000, 1000 * ms);
}
static int mv_hsic_phy_init(struct phy *phy)
{
struct mv_hsic_phy *mv_phy = phy_get_drvdata(phy);
struct platform_device *pdev = mv_phy->pdev;
void __iomem *base = mv_phy->base;
int ret;
clk_prepare_enable(mv_phy->clk);
/* Set reference clock */
writel(0x1 << PHY_28NM_HSIC_PLL_SELLPFR_SHIFT |
0xf0 << PHY_28NM_HSIC_PLL_FBDIV_SHIFT |
0xd << PHY_28NM_HSIC_PLL_REFDIV_SHIFT,
base + PHY_28NM_HSIC_PLL_CTRL01);
/* Turn on PLL */
writel(readl(base + PHY_28NM_HSIC_PLL_CTRL2) |
PHY_28NM_HSIC_S2H_PU_PLL,
base + PHY_28NM_HSIC_PLL_CTRL2);
/* Make sure PHY PLL is locked */
ret = wait_for_reg(base + PHY_28NM_HSIC_PLL_CTRL2,
PHY_28NM_HSIC_H2S_PLL_LOCK, 100);
if (ret) {
dev_err(&pdev->dev, "HSIC PHY PLL not locked after 100mS.");
clk_disable_unprepare(mv_phy->clk);
}
return ret;
}
static int mv_hsic_phy_power_on(struct phy *phy)
{
struct mv_hsic_phy *mv_phy = phy_get_drvdata(phy);
struct platform_device *pdev = mv_phy->pdev;
void __iomem *base = mv_phy->base;
u32 reg;
int ret;
reg = readl(base + PHY_28NM_HSIC_CTRL);
/* Avoid SE0 state when resume for some device will take it as reset */
reg &= ~S2H_DRV_SE0_4RESUME;
reg |= PHY_28NM_HSIC_S2H_HSIC_EN; /* Enable HSIC PHY */
writel(reg, base + PHY_28NM_HSIC_CTRL);
/*
* Calibration Timing
* ____________________________
* CAL START ___|
* ____________________
* CAL_DONE ___________|
* | 400us |
*/
/* Make sure PHY Calibration is ready */
ret = wait_for_reg(base + PHY_28NM_HSIC_IMPCAL_CAL,
PHY_28NM_HSIC_H2S_IMPCAL_DONE, 100);
if (ret) {
dev_warn(&pdev->dev, "HSIC PHY READY not set after 100mS.");
return ret;
}
/* Waiting for HSIC connect int*/
ret = wait_for_reg(base + PHY_28NM_HSIC_INT,
PHY_28NM_HSIC_CONNECT_INT, 200);
if (ret)
dev_warn(&pdev->dev, "HSIC wait for connect interrupt timeout.");
return ret;
}
static int mv_hsic_phy_power_off(struct phy *phy)
{
struct mv_hsic_phy *mv_phy = phy_get_drvdata(phy);
void __iomem *base = mv_phy->base;
writel(readl(base + PHY_28NM_HSIC_CTRL) & ~PHY_28NM_HSIC_S2H_HSIC_EN,
base + PHY_28NM_HSIC_CTRL);
return 0;
}
static int mv_hsic_phy_exit(struct phy *phy)
{
struct mv_hsic_phy *mv_phy = phy_get_drvdata(phy);
void __iomem *base = mv_phy->base;
/* Turn off PLL */
writel(readl(base + PHY_28NM_HSIC_PLL_CTRL2) &
~PHY_28NM_HSIC_S2H_PU_PLL,
base + PHY_28NM_HSIC_PLL_CTRL2);
clk_disable_unprepare(mv_phy->clk);
return 0;
}
static const struct phy_ops hsic_ops = {
.init = mv_hsic_phy_init,
.power_on = mv_hsic_phy_power_on,
.power_off = mv_hsic_phy_power_off,
.exit = mv_hsic_phy_exit,
.owner = THIS_MODULE,
};
static int mv_hsic_phy_probe(struct platform_device *pdev)
{
struct phy_provider *phy_provider;
struct mv_hsic_phy *mv_phy;
mv_phy = devm_kzalloc(&pdev->dev, sizeof(*mv_phy), GFP_KERNEL);
if (!mv_phy)
return -ENOMEM;
mv_phy->pdev = pdev;
mv_phy->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(mv_phy->clk)) {
dev_err(&pdev->dev, "failed to get clock.\n");
return PTR_ERR(mv_phy->clk);
}
mv_phy->base = devm_platform_ioremap_resource(pdev, 0);
if (IS_ERR(mv_phy->base))
return PTR_ERR(mv_phy->base);
mv_phy->phy = devm_phy_create(&pdev->dev, pdev->dev.of_node, &hsic_ops);
if (IS_ERR(mv_phy->phy))
return PTR_ERR(mv_phy->phy);
phy_set_drvdata(mv_phy->phy, mv_phy);
phy_provider = devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate);
return PTR_ERR_OR_ZERO(phy_provider);
}
static const struct of_device_id mv_hsic_phy_dt_match[] = {
{ .compatible = "marvell,pxa1928-hsic-phy", },
{},
};
MODULE_DEVICE_TABLE(of, mv_hsic_phy_dt_match);
static struct platform_driver mv_hsic_phy_driver = {
.probe = mv_hsic_phy_probe,
.driver = {
.name = "mv-hsic-phy",
.of_match_table = of_match_ptr(mv_hsic_phy_dt_match),
},
};
module_platform_driver(mv_hsic_phy_driver);
MODULE_AUTHOR("Rob Herring <robh@kernel.org>");
MODULE_DESCRIPTION("Marvell HSIC phy driver");
MODULE_LICENSE("GPL v2");
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