mirror of
https://github.com/torvalds/linux.git
synced 2024-11-24 21:21:41 +00:00
1de990d8a1
Add a PHY driver for uses with AHCI based SATA controller driver on the APQ8064 family of SoCs. This patch is a forward port from Qualcomm's v3.4 andriod kernel. Tested on IFC6410 board. CC: Sujit Reddy Thumma <sthumma@codeaurora.org> Tested-by: Kiran Padwal <kiran.padwal@smartplayin.com> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
289 lines
8.5 KiB
C
289 lines
8.5 KiB
C
/*
|
|
* 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/time.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/clk.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/phy/phy.h>
|
|
|
|
/* PHY registers */
|
|
#define UNIPHY_PLL_REFCLK_CFG 0x000
|
|
#define UNIPHY_PLL_PWRGEN_CFG 0x014
|
|
#define UNIPHY_PLL_GLB_CFG 0x020
|
|
#define UNIPHY_PLL_SDM_CFG0 0x038
|
|
#define UNIPHY_PLL_SDM_CFG1 0x03C
|
|
#define UNIPHY_PLL_SDM_CFG2 0x040
|
|
#define UNIPHY_PLL_SDM_CFG3 0x044
|
|
#define UNIPHY_PLL_SDM_CFG4 0x048
|
|
#define UNIPHY_PLL_SSC_CFG0 0x04C
|
|
#define UNIPHY_PLL_SSC_CFG1 0x050
|
|
#define UNIPHY_PLL_SSC_CFG2 0x054
|
|
#define UNIPHY_PLL_SSC_CFG3 0x058
|
|
#define UNIPHY_PLL_LKDET_CFG0 0x05C
|
|
#define UNIPHY_PLL_LKDET_CFG1 0x060
|
|
#define UNIPHY_PLL_LKDET_CFG2 0x064
|
|
#define UNIPHY_PLL_CAL_CFG0 0x06C
|
|
#define UNIPHY_PLL_CAL_CFG8 0x08C
|
|
#define UNIPHY_PLL_CAL_CFG9 0x090
|
|
#define UNIPHY_PLL_CAL_CFG10 0x094
|
|
#define UNIPHY_PLL_CAL_CFG11 0x098
|
|
#define UNIPHY_PLL_STATUS 0x0C0
|
|
|
|
#define SATA_PHY_SER_CTRL 0x100
|
|
#define SATA_PHY_TX_DRIV_CTRL0 0x104
|
|
#define SATA_PHY_TX_DRIV_CTRL1 0x108
|
|
#define SATA_PHY_TX_IMCAL0 0x11C
|
|
#define SATA_PHY_TX_IMCAL2 0x124
|
|
#define SATA_PHY_RX_IMCAL0 0x128
|
|
#define SATA_PHY_EQUAL 0x13C
|
|
#define SATA_PHY_OOB_TERM 0x144
|
|
#define SATA_PHY_CDR_CTRL0 0x148
|
|
#define SATA_PHY_CDR_CTRL1 0x14C
|
|
#define SATA_PHY_CDR_CTRL2 0x150
|
|
#define SATA_PHY_CDR_CTRL3 0x154
|
|
#define SATA_PHY_PI_CTRL0 0x168
|
|
#define SATA_PHY_POW_DWN_CTRL0 0x180
|
|
#define SATA_PHY_POW_DWN_CTRL1 0x184
|
|
#define SATA_PHY_TX_DATA_CTRL 0x188
|
|
#define SATA_PHY_ALIGNP 0x1A4
|
|
#define SATA_PHY_TX_IMCAL_STAT 0x1E4
|
|
#define SATA_PHY_RX_IMCAL_STAT 0x1E8
|
|
|
|
#define UNIPHY_PLL_LOCK BIT(0)
|
|
#define SATA_PHY_TX_CAL BIT(0)
|
|
#define SATA_PHY_RX_CAL BIT(0)
|
|
|
|
/* default timeout set to 1 sec */
|
|
#define TIMEOUT_MS 10000
|
|
#define DELAY_INTERVAL_US 100
|
|
|
|
struct qcom_apq8064_sata_phy {
|
|
void __iomem *mmio;
|
|
struct clk *cfg_clk;
|
|
struct device *dev;
|
|
};
|
|
|
|
/* Helper function to do poll and timeout */
|
|
static int read_poll_timeout(void __iomem *addr, u32 mask)
|
|
{
|
|
unsigned long timeout = jiffies + msecs_to_jiffies(TIMEOUT_MS);
|
|
|
|
do {
|
|
if (readl_relaxed(addr) & mask)
|
|
return 0;
|
|
|
|
usleep_range(DELAY_INTERVAL_US, DELAY_INTERVAL_US + 50);
|
|
} while (!time_after(jiffies, timeout));
|
|
|
|
return -ETIMEDOUT;
|
|
}
|
|
|
|
static int qcom_apq8064_sata_phy_init(struct phy *generic_phy)
|
|
{
|
|
struct qcom_apq8064_sata_phy *phy = phy_get_drvdata(generic_phy);
|
|
void __iomem *base = phy->mmio;
|
|
int ret = 0;
|
|
|
|
/* SATA phy initialization */
|
|
writel_relaxed(0x01, base + SATA_PHY_SER_CTRL);
|
|
writel_relaxed(0xB1, base + SATA_PHY_POW_DWN_CTRL0);
|
|
/* Make sure the power down happens before power up */
|
|
mb();
|
|
usleep_range(10, 60);
|
|
|
|
writel_relaxed(0x01, base + SATA_PHY_POW_DWN_CTRL0);
|
|
writel_relaxed(0x3E, base + SATA_PHY_POW_DWN_CTRL1);
|
|
writel_relaxed(0x01, base + SATA_PHY_RX_IMCAL0);
|
|
writel_relaxed(0x01, base + SATA_PHY_TX_IMCAL0);
|
|
writel_relaxed(0x02, base + SATA_PHY_TX_IMCAL2);
|
|
|
|
/* Write UNIPHYPLL registers to configure PLL */
|
|
writel_relaxed(0x04, base + UNIPHY_PLL_REFCLK_CFG);
|
|
writel_relaxed(0x00, base + UNIPHY_PLL_PWRGEN_CFG);
|
|
|
|
writel_relaxed(0x0A, base + UNIPHY_PLL_CAL_CFG0);
|
|
writel_relaxed(0xF3, base + UNIPHY_PLL_CAL_CFG8);
|
|
writel_relaxed(0x01, base + UNIPHY_PLL_CAL_CFG9);
|
|
writel_relaxed(0xED, base + UNIPHY_PLL_CAL_CFG10);
|
|
writel_relaxed(0x02, base + UNIPHY_PLL_CAL_CFG11);
|
|
|
|
writel_relaxed(0x36, base + UNIPHY_PLL_SDM_CFG0);
|
|
writel_relaxed(0x0D, base + UNIPHY_PLL_SDM_CFG1);
|
|
writel_relaxed(0xA3, base + UNIPHY_PLL_SDM_CFG2);
|
|
writel_relaxed(0xF0, base + UNIPHY_PLL_SDM_CFG3);
|
|
writel_relaxed(0x00, base + UNIPHY_PLL_SDM_CFG4);
|
|
|
|
writel_relaxed(0x19, base + UNIPHY_PLL_SSC_CFG0);
|
|
writel_relaxed(0xE1, base + UNIPHY_PLL_SSC_CFG1);
|
|
writel_relaxed(0x00, base + UNIPHY_PLL_SSC_CFG2);
|
|
writel_relaxed(0x11, base + UNIPHY_PLL_SSC_CFG3);
|
|
|
|
writel_relaxed(0x04, base + UNIPHY_PLL_LKDET_CFG0);
|
|
writel_relaxed(0xFF, base + UNIPHY_PLL_LKDET_CFG1);
|
|
|
|
writel_relaxed(0x02, base + UNIPHY_PLL_GLB_CFG);
|
|
/* make sure global config LDO power down happens before power up */
|
|
mb();
|
|
|
|
writel_relaxed(0x03, base + UNIPHY_PLL_GLB_CFG);
|
|
writel_relaxed(0x05, base + UNIPHY_PLL_LKDET_CFG2);
|
|
|
|
/* PLL Lock wait */
|
|
ret = read_poll_timeout(base + UNIPHY_PLL_STATUS, UNIPHY_PLL_LOCK);
|
|
if (ret) {
|
|
dev_err(phy->dev, "poll timeout UNIPHY_PLL_STATUS\n");
|
|
return ret;
|
|
}
|
|
|
|
/* TX Calibration */
|
|
ret = read_poll_timeout(base + SATA_PHY_TX_IMCAL_STAT, SATA_PHY_TX_CAL);
|
|
if (ret) {
|
|
dev_err(phy->dev, "poll timeout SATA_PHY_TX_IMCAL_STAT\n");
|
|
return ret;
|
|
}
|
|
|
|
/* RX Calibration */
|
|
ret = read_poll_timeout(base + SATA_PHY_RX_IMCAL_STAT, SATA_PHY_RX_CAL);
|
|
if (ret) {
|
|
dev_err(phy->dev, "poll timeout SATA_PHY_RX_IMCAL_STAT\n");
|
|
return ret;
|
|
}
|
|
|
|
/* SATA phy calibrated succesfully, power up to functional mode */
|
|
writel_relaxed(0x3E, base + SATA_PHY_POW_DWN_CTRL1);
|
|
writel_relaxed(0x01, base + SATA_PHY_RX_IMCAL0);
|
|
writel_relaxed(0x01, base + SATA_PHY_TX_IMCAL0);
|
|
|
|
writel_relaxed(0x00, base + SATA_PHY_POW_DWN_CTRL1);
|
|
writel_relaxed(0x59, base + SATA_PHY_CDR_CTRL0);
|
|
writel_relaxed(0x04, base + SATA_PHY_CDR_CTRL1);
|
|
writel_relaxed(0x00, base + SATA_PHY_CDR_CTRL2);
|
|
writel_relaxed(0x00, base + SATA_PHY_PI_CTRL0);
|
|
writel_relaxed(0x00, base + SATA_PHY_CDR_CTRL3);
|
|
writel_relaxed(0x01, base + SATA_PHY_POW_DWN_CTRL0);
|
|
|
|
writel_relaxed(0x11, base + SATA_PHY_TX_DATA_CTRL);
|
|
writel_relaxed(0x43, base + SATA_PHY_ALIGNP);
|
|
writel_relaxed(0x04, base + SATA_PHY_OOB_TERM);
|
|
|
|
writel_relaxed(0x01, base + SATA_PHY_EQUAL);
|
|
writel_relaxed(0x09, base + SATA_PHY_TX_DRIV_CTRL0);
|
|
writel_relaxed(0x09, base + SATA_PHY_TX_DRIV_CTRL1);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int qcom_apq8064_sata_phy_exit(struct phy *generic_phy)
|
|
{
|
|
struct qcom_apq8064_sata_phy *phy = phy_get_drvdata(generic_phy);
|
|
void __iomem *base = phy->mmio;
|
|
|
|
/* Power down PHY */
|
|
writel_relaxed(0xF8, base + SATA_PHY_POW_DWN_CTRL0);
|
|
writel_relaxed(0xFE, base + SATA_PHY_POW_DWN_CTRL1);
|
|
|
|
/* Power down PLL block */
|
|
writel_relaxed(0x00, base + UNIPHY_PLL_GLB_CFG);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct phy_ops qcom_apq8064_sata_phy_ops = {
|
|
.init = qcom_apq8064_sata_phy_init,
|
|
.exit = qcom_apq8064_sata_phy_exit,
|
|
.owner = THIS_MODULE,
|
|
};
|
|
|
|
static int qcom_apq8064_sata_phy_probe(struct platform_device *pdev)
|
|
{
|
|
struct qcom_apq8064_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, &qcom_apq8064_sata_phy_ops, NULL);
|
|
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_apq8064_sata_phy_remove(struct platform_device *pdev)
|
|
{
|
|
struct qcom_apq8064_sata_phy *phy = platform_get_drvdata(pdev);
|
|
|
|
clk_disable_unprepare(phy->cfg_clk);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id qcom_apq8064_sata_phy_of_match[] = {
|
|
{ .compatible = "qcom,apq8064-sata-phy" },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, qcom_apq8064_sata_phy_of_match);
|
|
|
|
static struct platform_driver qcom_apq8064_sata_phy_driver = {
|
|
.probe = qcom_apq8064_sata_phy_probe,
|
|
.remove = qcom_apq8064_sata_phy_remove,
|
|
.driver = {
|
|
.name = "qcom-apq8064-sata-phy",
|
|
.owner = THIS_MODULE,
|
|
.of_match_table = qcom_apq8064_sata_phy_of_match,
|
|
}
|
|
};
|
|
module_platform_driver(qcom_apq8064_sata_phy_driver);
|
|
|
|
MODULE_DESCRIPTION("QCOM apq8064 SATA PHY driver");
|
|
MODULE_LICENSE("GPL v2");
|