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/*
* Copyright (c) 2014, The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only 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/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_address.h>
#include <linux/time.h>
#include <linux/delay.h>
#include <linux/clk.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/phy/phy.h>
struct qcom_ipq806x_sata_phy {
void __iomem *mmio;
struct clk *cfg_clk;
struct device *dev;
};
#define __set(v, a, b) (((v) << (b)) & GENMASK(a, b))
#define SATA_PHY_P0_PARAM0 0x200
#define SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN3(x) __set(x, 17, 12)
#define SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN3_MASK GENMASK(17, 12)
#define SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN2(x) __set(x, 11, 6)
#define SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN2_MASK GENMASK(11, 6)
#define SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN1(x) __set(x, 5, 0)
#define SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN1_MASK GENMASK(5, 0)
#define SATA_PHY_P0_PARAM1 0x204
#define SATA_PHY_P0_PARAM1_RESERVED_BITS31_21(x) __set(x, 31, 21)
#define SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN3(x) __set(x, 20, 14)
#define SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN3_MASK GENMASK(20, 14)
#define SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN2(x) __set(x, 13, 7)
#define SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN2_MASK GENMASK(13, 7)
#define SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN1(x) __set(x, 6, 0)
#define SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN1_MASK GENMASK(6, 0)
#define SATA_PHY_P0_PARAM2 0x208
#define SATA_PHY_P0_PARAM2_RX_EQ(x) __set(x, 20, 18)
#define SATA_PHY_P0_PARAM2_RX_EQ_MASK GENMASK(20, 18)
#define SATA_PHY_P0_PARAM3 0x20C
#define SATA_PHY_SSC_EN 0x8
#define SATA_PHY_P0_PARAM4 0x210
#define SATA_PHY_REF_SSP_EN 0x2
#define SATA_PHY_RESET 0x1
static int qcom_ipq806x_sata_phy_init(struct phy *generic_phy)
{
struct qcom_ipq806x_sata_phy *phy = phy_get_drvdata(generic_phy);
u32 reg;
/* Setting SSC_EN to 1 */
reg = readl_relaxed(phy->mmio + SATA_PHY_P0_PARAM3);
reg = reg | SATA_PHY_SSC_EN;
writel_relaxed(reg, phy->mmio + SATA_PHY_P0_PARAM3);
reg = readl_relaxed(phy->mmio + SATA_PHY_P0_PARAM0) &
~(SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN3_MASK |
SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN2_MASK |
SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN1_MASK);
reg |= SATA_PHY_P0_PARAM0_P0_TX_PREEMPH_GEN3(0xf);
writel_relaxed(reg, phy->mmio + SATA_PHY_P0_PARAM0);
reg = readl_relaxed(phy->mmio + SATA_PHY_P0_PARAM1) &
~(SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN3_MASK |
SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN2_MASK |
SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN1_MASK);
reg |= SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN3(0x55) |
SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN2(0x55) |
SATA_PHY_P0_PARAM1_P0_TX_AMPLITUDE_GEN1(0x55);
writel_relaxed(reg, phy->mmio + SATA_PHY_P0_PARAM1);
reg = readl_relaxed(phy->mmio + SATA_PHY_P0_PARAM2) &
~SATA_PHY_P0_PARAM2_RX_EQ_MASK;
reg |= SATA_PHY_P0_PARAM2_RX_EQ(0x3);
writel_relaxed(reg, phy->mmio + SATA_PHY_P0_PARAM2);
/* Setting PHY_RESET to 1 */
reg = readl_relaxed(phy->mmio + SATA_PHY_P0_PARAM4);
reg = reg | SATA_PHY_RESET;
writel_relaxed(reg, phy->mmio + SATA_PHY_P0_PARAM4);
/* Setting REF_SSP_EN to 1 */
reg = readl_relaxed(phy->mmio + SATA_PHY_P0_PARAM4);
reg = reg | SATA_PHY_REF_SSP_EN | SATA_PHY_RESET;
writel_relaxed(reg, phy->mmio + SATA_PHY_P0_PARAM4);
/* make sure all changes complete before we let the PHY out of reset */
mb();
/* sleep for max. 50us more to combine processor wakeups */
usleep_range(20, 20 + 50);
/* Clearing PHY_RESET to 0 */
reg = readl_relaxed(phy->mmio + SATA_PHY_P0_PARAM4);
reg = reg & ~SATA_PHY_RESET;
writel_relaxed(reg, phy->mmio + SATA_PHY_P0_PARAM4);
return 0;
}
static int qcom_ipq806x_sata_phy_exit(struct phy *generic_phy)
{
struct qcom_ipq806x_sata_phy *phy = phy_get_drvdata(generic_phy);
u32 reg;
/* Setting PHY_RESET to 1 */
reg = readl_relaxed(phy->mmio + SATA_PHY_P0_PARAM4);
reg = reg | SATA_PHY_RESET;
writel_relaxed(reg, phy->mmio + SATA_PHY_P0_PARAM4);
return 0;
}
static struct phy_ops qcom_ipq806x_sata_phy_ops = {
.init = qcom_ipq806x_sata_phy_init,
.exit = qcom_ipq806x_sata_phy_exit,
.owner = THIS_MODULE,
};
static int qcom_ipq806x_sata_phy_probe(struct platform_device *pdev)
{
struct qcom_ipq806x_sata_phy *phy;
struct device *dev = &pdev->dev;
struct resource *res;
struct phy_provider *phy_provider;
struct phy *generic_phy;
int ret;
phy = devm_kzalloc(dev, sizeof(*phy), GFP_KERNEL);
if (!phy)
return -ENOMEM;
res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
phy->mmio = devm_ioremap_resource(dev, res);
if (IS_ERR(phy->mmio))
return PTR_ERR(phy->mmio);
generic_phy = devm_phy_create(dev, NULL, &qcom_ipq806x_sata_phy_ops);
if (IS_ERR(generic_phy)) {
dev_err(dev, "%s: failed to create phy\n", __func__);
return PTR_ERR(generic_phy);
}
phy->dev = dev;
phy_set_drvdata(generic_phy, phy);
platform_set_drvdata(pdev, phy);
phy->cfg_clk = devm_clk_get(dev, "cfg");
if (IS_ERR(phy->cfg_clk)) {
dev_err(dev, "Failed to get sata cfg clock\n");
return PTR_ERR(phy->cfg_clk);
}
ret = clk_prepare_enable(phy->cfg_clk);
if (ret)
return ret;
phy_provider = devm_of_phy_provider_register(dev, of_phy_simple_xlate);
if (IS_ERR(phy_provider)) {
clk_disable_unprepare(phy->cfg_clk);
dev_err(dev, "%s: failed to register phy\n", __func__);
return PTR_ERR(phy_provider);
}
return 0;
}
static int qcom_ipq806x_sata_phy_remove(struct platform_device *pdev)
{
struct qcom_ipq806x_sata_phy *phy = platform_get_drvdata(pdev);
clk_disable_unprepare(phy->cfg_clk);
return 0;
}
static const struct of_device_id qcom_ipq806x_sata_phy_of_match[] = {
{ .compatible = "qcom,ipq806x-sata-phy" },
{ },
};
MODULE_DEVICE_TABLE(of, qcom_ipq806x_sata_phy_of_match);
static struct platform_driver qcom_ipq806x_sata_phy_driver = {
.probe = qcom_ipq806x_sata_phy_probe,
.remove = qcom_ipq806x_sata_phy_remove,
.driver = {
.name = "qcom-ipq806x-sata-phy",
.of_match_table = qcom_ipq806x_sata_phy_of_match,
}
};
module_platform_driver(qcom_ipq806x_sata_phy_driver);
MODULE_DESCRIPTION("QCOM IPQ806x SATA PHY driver");
MODULE_LICENSE("GPL v2");
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